1 /*- 2 * Copyright (c) 2016-9 3 * Netflix Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 /** 29 * Author: Randall Stewart <rrs@netflix.com> 30 * This work is based on the ACM Queue paper 31 * BBR - Congestion Based Congestion Control 32 * and also numerous discussions with Neal, Yuchung and Van. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_ipsec.h" 41 #include "opt_tcpdebug.h" 42 #include "opt_ratelimit.h" 43 #include "opt_kern_tls.h" 44 #include <sys/param.h> 45 #include <sys/arb.h> 46 #include <sys/module.h> 47 #include <sys/kernel.h> 48 #ifdef TCP_HHOOK 49 #include <sys/hhook.h> 50 #endif 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/proc.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #ifdef KERN_TLS 57 #include <sys/ktls.h> 58 #endif 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #ifdef STATS 62 #include <sys/qmath.h> 63 #include <sys/tree.h> 64 #include <sys/stats.h> /* Must come after qmath.h and tree.h */ 65 #endif 66 #include <sys/refcount.h> 67 #include <sys/queue.h> 68 #include <sys/eventhandler.h> 69 #include <sys/smp.h> 70 #include <sys/kthread.h> 71 #include <sys/lock.h> 72 #include <sys/mutex.h> 73 #include <sys/tim_filter.h> 74 #include <sys/time.h> 75 #include <vm/uma.h> 76 #include <sys/kern_prefetch.h> 77 78 #include <net/route.h> 79 #include <net/vnet.h> 80 81 #define TCPSTATES /* for logging */ 82 83 #include <netinet/in.h> 84 #include <netinet/in_kdtrace.h> 85 #include <netinet/in_pcb.h> 86 #include <netinet/ip.h> 87 #include <netinet/ip_icmp.h> /* required for icmp_var.h */ 88 #include <netinet/icmp_var.h> /* for ICMP_BANDLIM */ 89 #include <netinet/ip_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet6/in6_pcb.h> 92 #include <netinet6/ip6_var.h> 93 #define TCPOUTFLAGS 94 #include <netinet/tcp.h> 95 #include <netinet/tcp_fsm.h> 96 #include <netinet/tcp_seq.h> 97 #include <netinet/tcp_timer.h> 98 #include <netinet/tcp_var.h> 99 #include <netinet/tcpip.h> 100 #include <netinet/tcp_hpts.h> 101 #include <netinet/cc/cc.h> 102 #include <netinet/tcp_log_buf.h> 103 #include <netinet/tcp_ratelimit.h> 104 #include <netinet/tcp_lro.h> 105 #ifdef TCPDEBUG 106 #include <netinet/tcp_debug.h> 107 #endif /* TCPDEBUG */ 108 #ifdef TCP_OFFLOAD 109 #include <netinet/tcp_offload.h> 110 #endif 111 #ifdef INET6 112 #include <netinet6/tcp6_var.h> 113 #endif 114 #include <netinet/tcp_fastopen.h> 115 116 #include <netipsec/ipsec_support.h> 117 #include <net/if.h> 118 #include <net/if_var.h> 119 #include <net/ethernet.h> 120 121 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 122 #include <netipsec/ipsec.h> 123 #include <netipsec/ipsec6.h> 124 #endif /* IPSEC */ 125 126 #include <netinet/udp.h> 127 #include <netinet/udp_var.h> 128 #include <machine/in_cksum.h> 129 130 #ifdef MAC 131 #include <security/mac/mac_framework.h> 132 #endif 133 134 #include "sack_filter.h" 135 #include "tcp_bbr.h" 136 #include "rack_bbr_common.h" 137 uma_zone_t bbr_zone; 138 uma_zone_t bbr_pcb_zone; 139 140 struct sysctl_ctx_list bbr_sysctl_ctx; 141 struct sysctl_oid *bbr_sysctl_root; 142 143 #define TCPT_RANGESET_NOSLOP(tv, value, tvmin, tvmax) do { \ 144 (tv) = (value); \ 145 if ((u_long)(tv) < (u_long)(tvmin)) \ 146 (tv) = (tvmin); \ 147 if ((u_long)(tv) > (u_long)(tvmax)) \ 148 (tv) = (tvmax); \ 149 } while(0) 150 151 /*#define BBR_INVARIANT 1*/ 152 153 /* 154 * initial window 155 */ 156 static uint32_t bbr_def_init_win = 10; 157 static int32_t bbr_persist_min = 250000; /* 250ms */ 158 static int32_t bbr_persist_max = 1000000; /* 1 Second */ 159 static int32_t bbr_cwnd_may_shrink = 0; 160 static int32_t bbr_cwndtarget_rtt_touse = BBR_RTT_PROP; 161 static int32_t bbr_num_pktepo_for_del_limit = BBR_NUM_RTTS_FOR_DEL_LIMIT; 162 static int32_t bbr_hardware_pacing_limit = 8000; 163 static int32_t bbr_quanta = 3; /* How much extra quanta do we get? */ 164 static int32_t bbr_no_retran = 0; 165 166 167 static int32_t bbr_error_base_paceout = 10000; /* usec to pace */ 168 static int32_t bbr_max_net_error_cnt = 10; 169 /* Should the following be dynamic too -- loss wise */ 170 static int32_t bbr_rtt_gain_thresh = 0; 171 /* Measurement controls */ 172 static int32_t bbr_use_google_algo = 1; 173 static int32_t bbr_ts_limiting = 1; 174 static int32_t bbr_ts_can_raise = 0; 175 static int32_t bbr_do_red = 600; 176 static int32_t bbr_red_scale = 20000; 177 static int32_t bbr_red_mul = 1; 178 static int32_t bbr_red_div = 2; 179 static int32_t bbr_red_growth_restrict = 1; 180 static int32_t bbr_target_is_bbunit = 0; 181 static int32_t bbr_drop_limit = 0; 182 /* 183 * How much gain do we need to see to 184 * stay in startup? 185 */ 186 static int32_t bbr_marks_rxt_sack_passed = 0; 187 static int32_t bbr_start_exit = 25; 188 static int32_t bbr_low_start_exit = 25; /* When we are in reduced gain */ 189 static int32_t bbr_startup_loss_thresh = 2000; /* 20.00% loss */ 190 static int32_t bbr_hptsi_max_mul = 1; /* These two mul/div assure a min pacing */ 191 static int32_t bbr_hptsi_max_div = 2; /* time, 0 means turned off. We need this 192 * if we go back ever to where the pacer 193 * has priority over timers. 194 */ 195 static int32_t bbr_policer_call_from_rack_to = 0; 196 static int32_t bbr_policer_detection_enabled = 1; 197 static int32_t bbr_min_measurements_req = 1; /* We need at least 2 198 * measurments before we are 199 * "good" note that 2 == 1. 200 * This is because we use a > 201 * comparison. This means if 202 * min_measure was 0, it takes 203 * num-measures > min(0) and 204 * you get 1 measurement and 205 * you are good. Set to 1, you 206 * have to have two 207 * measurements (this is done 208 * to prevent it from being ok 209 * to have no measurements). */ 210 static int32_t bbr_no_pacing_until = 4; 211 212 static int32_t bbr_min_usec_delta = 20000; /* 20,000 usecs */ 213 static int32_t bbr_min_peer_delta = 20; /* 20 units */ 214 static int32_t bbr_delta_percent = 150; /* 15.0 % */ 215 216 static int32_t bbr_target_cwnd_mult_limit = 8; 217 /* 218 * bbr_cwnd_min_val is the number of 219 * segments we hold to in the RTT probe 220 * state typically 4. 221 */ 222 static int32_t bbr_cwnd_min_val = BBR_PROBERTT_NUM_MSS; 223 224 225 static int32_t bbr_cwnd_min_val_hs = BBR_HIGHSPEED_NUM_MSS; 226 227 static int32_t bbr_gain_to_target = 1; 228 static int32_t bbr_gain_gets_extra_too = 1; 229 /* 230 * bbr_high_gain is the 2/ln(2) value we need 231 * to double the sending rate in startup. This 232 * is used for both cwnd and hptsi gain's. 233 */ 234 static int32_t bbr_high_gain = BBR_UNIT * 2885 / 1000 + 1; 235 static int32_t bbr_startup_lower = BBR_UNIT * 1500 / 1000 + 1; 236 static int32_t bbr_use_lower_gain_in_startup = 1; 237 238 /* thresholds for reduction on drain in sub-states/drain */ 239 static int32_t bbr_drain_rtt = BBR_SRTT; 240 static int32_t bbr_drain_floor = 88; 241 static int32_t google_allow_early_out = 1; 242 static int32_t google_consider_lost = 1; 243 static int32_t bbr_drain_drop_mul = 4; 244 static int32_t bbr_drain_drop_div = 5; 245 static int32_t bbr_rand_ot = 50; 246 static int32_t bbr_can_force_probertt = 0; 247 static int32_t bbr_can_adjust_probertt = 1; 248 static int32_t bbr_probertt_sets_rtt = 0; 249 static int32_t bbr_can_use_ts_for_rtt = 1; 250 static int32_t bbr_is_ratio = 0; 251 static int32_t bbr_sub_drain_app_limit = 1; 252 static int32_t bbr_prtt_slam_cwnd = 1; 253 static int32_t bbr_sub_drain_slam_cwnd = 1; 254 static int32_t bbr_slam_cwnd_in_main_drain = 1; 255 static int32_t bbr_filter_len_sec = 6; /* How long does the rttProp filter 256 * hold */ 257 static uint32_t bbr_rtt_probe_limit = (USECS_IN_SECOND * 4); 258 /* 259 * bbr_drain_gain is the reverse of the high_gain 260 * designed to drain back out the standing queue 261 * that is formed in startup by causing a larger 262 * hptsi gain and thus drainging the packets 263 * in flight. 264 */ 265 static int32_t bbr_drain_gain = BBR_UNIT * 1000 / 2885; 266 static int32_t bbr_rttprobe_gain = 192; 267 268 /* 269 * The cwnd_gain is the default cwnd gain applied when 270 * calculating a target cwnd. Note that the cwnd is 271 * a secondary factor in the way BBR works (see the 272 * paper and think about it, it will take some time). 273 * Basically the hptsi_gain spreads the packets out 274 * so you never get more than BDP to the peer even 275 * if the cwnd is high. In our implemenation that 276 * means in non-recovery/retransmission scenarios 277 * cwnd will never be reached by the flight-size. 278 */ 279 static int32_t bbr_cwnd_gain = BBR_UNIT * 2; 280 static int32_t bbr_tlp_type_to_use = BBR_SRTT; 281 static int32_t bbr_delack_time = 100000; /* 100ms in useconds */ 282 static int32_t bbr_sack_not_required = 0; /* set to one to allow non-sack to use bbr */ 283 static int32_t bbr_initial_bw_bps = 62500; /* 500kbps in bytes ps */ 284 static int32_t bbr_ignore_data_after_close = 1; 285 static int16_t bbr_hptsi_gain[] = { 286 (BBR_UNIT *5 / 4), 287 (BBR_UNIT * 3 / 4), 288 BBR_UNIT, 289 BBR_UNIT, 290 BBR_UNIT, 291 BBR_UNIT, 292 BBR_UNIT, 293 BBR_UNIT 294 }; 295 int32_t bbr_use_rack_resend_cheat = 1; 296 int32_t bbr_sends_full_iwnd = 1; 297 298 #define BBR_HPTSI_GAIN_MAX 8 299 /* 300 * The BBR module incorporates a number of 301 * TCP ideas that have been put out into the IETF 302 * over the last few years: 303 * - Yuchung Cheng's RACK TCP (for which its named) that 304 * will stop us using the number of dup acks and instead 305 * use time as the gage of when we retransmit. 306 * - Reorder Detection of RFC4737 and the Tail-Loss probe draft 307 * of Dukkipati et.al. 308 * - Van Jacobson's et.al BBR. 309 * 310 * RACK depends on SACK, so if an endpoint arrives that 311 * cannot do SACK the state machine below will shuttle the 312 * connection back to using the "default" TCP stack that is 313 * in FreeBSD. 314 * 315 * To implement BBR and RACK the original TCP stack was first decomposed 316 * into a functional state machine with individual states 317 * for each of the possible TCP connection states. The do_segement 318 * functions role in life is to mandate the connection supports SACK 319 * initially and then assure that the RACK state matches the conenction 320 * state before calling the states do_segment function. Data processing 321 * of inbound segments also now happens in the hpts_do_segment in general 322 * with only one exception. This is so we can keep the connection on 323 * a single CPU. 324 * 325 * Each state is simplified due to the fact that the original do_segment 326 * has been decomposed and we *know* what state we are in (no 327 * switches on the state) and all tests for SACK are gone. This 328 * greatly simplifies what each state does. 329 * 330 * TCP output is also over-written with a new version since it 331 * must maintain the new rack scoreboard and has had hptsi 332 * integrated as a requirment. Still todo is to eliminate the 333 * use of the callout_() system and use the hpts for all 334 * timers as well. 335 */ 336 static uint32_t bbr_rtt_probe_time = 200000; /* 200ms in micro seconds */ 337 static uint32_t bbr_rtt_probe_cwndtarg = 4; /* How many mss's outstanding */ 338 static const int32_t bbr_min_req_free = 2; /* The min we must have on the 339 * free list */ 340 static int32_t bbr_tlp_thresh = 1; 341 static int32_t bbr_reorder_thresh = 2; 342 static int32_t bbr_reorder_fade = 60000000; /* 0 - never fade, def 343 * 60,000,000 - 60 seconds */ 344 static int32_t bbr_pkt_delay = 1000; 345 static int32_t bbr_min_to = 1000; /* Number of usec's minimum timeout */ 346 static int32_t bbr_incr_timers = 1; 347 348 static int32_t bbr_tlp_min = 10000; /* 10ms in usecs */ 349 static int32_t bbr_delayed_ack_time = 200000; /* 200ms in usecs */ 350 static int32_t bbr_exit_startup_at_loss = 1; 351 352 /* 353 * bbr_lt_bw_ratio is 1/8th 354 * bbr_lt_bw_diff is < 4 Kbit/sec 355 */ 356 static uint64_t bbr_lt_bw_diff = 4000 / 8; /* In bytes per second */ 357 static uint64_t bbr_lt_bw_ratio = 8; /* For 1/8th */ 358 static uint32_t bbr_lt_bw_max_rtts = 48; /* How many rtt's do we use 359 * the lt_bw for */ 360 static uint32_t bbr_lt_intvl_min_rtts = 4; /* Min num of RTT's to measure 361 * lt_bw */ 362 static int32_t bbr_lt_intvl_fp = 0; /* False positive epoch diff */ 363 static int32_t bbr_lt_loss_thresh = 196; /* Lost vs delivered % */ 364 static int32_t bbr_lt_fd_thresh = 100; /* false detection % */ 365 366 static int32_t bbr_verbose_logging = 0; 367 /* 368 * Currently regular tcp has a rto_min of 30ms 369 * the backoff goes 12 times so that ends up 370 * being a total of 122.850 seconds before a 371 * connection is killed. 372 */ 373 static int32_t bbr_rto_min_ms = 30; /* 30ms same as main freebsd */ 374 static int32_t bbr_rto_max_sec = 4; /* 4 seconds */ 375 376 /****************************************************/ 377 /* DEFAULT TSO SIZING (cpu performance impacting) */ 378 /****************************************************/ 379 /* What amount is our formula using to get TSO size */ 380 static int32_t bbr_hptsi_per_second = 1000; 381 382 /* 383 * For hptsi under bbr_cross_over connections what is delay 384 * target 7ms (in usec) combined with a seg_max of 2 385 * gets us close to identical google behavior in 386 * TSO size selection (possibly more 1MSS sends). 387 */ 388 static int32_t bbr_hptsi_segments_delay_tar = 7000; 389 390 /* Does pacing delay include overhead's in its time calculations? */ 391 static int32_t bbr_include_enet_oh = 0; 392 static int32_t bbr_include_ip_oh = 1; 393 static int32_t bbr_include_tcp_oh = 1; 394 static int32_t bbr_google_discount = 10; 395 396 /* Do we use (nf mode) pkt-epoch to drive us or rttProp? */ 397 static int32_t bbr_state_is_pkt_epoch = 0; 398 static int32_t bbr_state_drain_2_tar = 1; 399 /* What is the max the 0 - bbr_cross_over MBPS TSO target 400 * can reach using our delay target. Note that this 401 * value becomes the floor for the cross over 402 * algorithm. 403 */ 404 static int32_t bbr_hptsi_segments_max = 2; 405 static int32_t bbr_hptsi_segments_floor = 1; 406 static int32_t bbr_hptsi_utter_max = 0; 407 408 /* What is the min the 0 - bbr_cross-over MBPS TSO target can be */ 409 static int32_t bbr_hptsi_bytes_min = 1460; 410 static int32_t bbr_all_get_min = 0; 411 412 /* Cross over point from algo-a to algo-b */ 413 static uint32_t bbr_cross_over = TWENTY_THREE_MBPS; 414 415 /* Do we deal with our restart state? */ 416 static int32_t bbr_uses_idle_restart = 0; 417 static int32_t bbr_idle_restart_threshold = 100000; /* 100ms in useconds */ 418 419 /* Do we allow hardware pacing? */ 420 static int32_t bbr_allow_hdwr_pacing = 0; 421 static int32_t bbr_hdwr_pace_adjust = 2; /* multipler when we calc the tso size */ 422 static int32_t bbr_hdwr_pace_floor = 1; 423 static int32_t bbr_hdwr_pacing_delay_cnt = 10; 424 425 /****************************************************/ 426 static int32_t bbr_resends_use_tso = 0; 427 static int32_t bbr_tlp_max_resend = 2; 428 static int32_t bbr_sack_block_limit = 128; 429 430 #define BBR_MAX_STAT 19 431 counter_u64_t bbr_state_time[BBR_MAX_STAT]; 432 counter_u64_t bbr_state_lost[BBR_MAX_STAT]; 433 counter_u64_t bbr_state_resend[BBR_MAX_STAT]; 434 counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; 435 counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; 436 counter_u64_t bbr_out_size[TCP_MSS_ACCT_SIZE]; 437 counter_u64_t bbr_flows_whdwr_pacing; 438 counter_u64_t bbr_flows_nohdwr_pacing; 439 440 counter_u64_t bbr_nohdwr_pacing_enobuf; 441 counter_u64_t bbr_hdwr_pacing_enobuf; 442 443 static inline uint64_t bbr_get_bw(struct tcp_bbr *bbr); 444 445 /* 446 * Static defintions we need for forward declarations. 447 */ 448 static uint32_t 449 bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, 450 uint32_t useconds_time, uint64_t bw); 451 static uint32_t 452 bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain); 453 static void 454 bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win); 455 static void 456 bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses); 457 static void 458 bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int line, 459 int dolog); 460 static uint32_t 461 bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain); 462 static void 463 bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, 464 int32_t pkt_epoch, uint32_t losses); 465 static uint32_t 466 bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm); 467 static uint32_t bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp); 468 static uint32_t 469 bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, 470 struct bbr_sendmap *rsm, uint32_t srtt, 471 uint32_t cts); 472 static void 473 bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, 474 int32_t line); 475 static void 476 bbr_set_state_target(struct tcp_bbr *bbr, int line); 477 static void 478 bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line); 479 480 static void 481 bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line); 482 483 static void 484 tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts); 485 486 static void 487 bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts); 488 489 static void 490 bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, uint32_t rtt, 491 uint32_t line, uint8_t is_start, uint16_t set); 492 493 static struct bbr_sendmap * 494 bbr_find_lowest_rsm(struct tcp_bbr *bbr); 495 static __inline uint32_t 496 bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type); 497 static void 498 bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which); 499 500 static void 501 bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, 502 uint32_t thresh, uint32_t to); 503 static void 504 bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag); 505 506 static void 507 bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, 508 uint32_t del_by, uint32_t cts, uint32_t sloton, uint32_t prev_delay); 509 510 static void 511 bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, 512 uint32_t cts, int32_t line); 513 static void 514 bbr_stop_all_timers(struct tcpcb *tp); 515 static void 516 bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts); 517 static void 518 bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts); 519 static void 520 bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts); 521 522 523 static void 524 bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, 525 uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod); 526 527 static inline uint8_t 528 bbr_state_val(struct tcp_bbr *bbr) 529 { 530 return(bbr->rc_bbr_substate); 531 } 532 533 static inline uint32_t 534 get_min_cwnd(struct tcp_bbr *bbr) 535 { 536 int mss; 537 538 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 539 if (bbr_get_rtt(bbr, BBR_RTT_PROP) < BBR_HIGH_SPEED) 540 return (bbr_cwnd_min_val_hs * mss); 541 else 542 return (bbr_cwnd_min_val * mss); 543 } 544 545 static uint32_t 546 bbr_get_persists_timer_val(struct tcpcb *tp, struct tcp_bbr *bbr) 547 { 548 uint64_t srtt, var; 549 uint64_t ret_val; 550 551 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT; 552 if (tp->t_srtt == 0) { 553 srtt = (uint64_t)BBR_INITIAL_RTO; 554 var = 0; 555 } else { 556 srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); 557 var = ((uint64_t)TICKS_2_USEC(tp->t_rttvar) >> TCP_RTT_SHIFT); 558 } 559 TCPT_RANGESET_NOSLOP(ret_val, ((srtt + var) * tcp_backoff[tp->t_rxtshift]), 560 bbr_persist_min, bbr_persist_max); 561 return ((uint32_t)ret_val); 562 } 563 564 static uint32_t 565 bbr_timer_start(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 566 { 567 /* 568 * Start the FR timer, we do this based on getting the first one in 569 * the rc_tmap. Note that if its NULL we must stop the timer. in all 570 * events we need to stop the running timer (if its running) before 571 * starting the new one. 572 */ 573 uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse; 574 int32_t idx; 575 int32_t is_tlp_timer = 0; 576 struct bbr_sendmap *rsm; 577 578 if (bbr->rc_all_timers_stopped) { 579 /* All timers have been stopped none are to run */ 580 return (0); 581 } 582 if (bbr->rc_in_persist) { 583 /* We can't start any timer in persists */ 584 return (bbr_get_persists_timer_val(tp, bbr)); 585 } 586 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 587 if ((rsm == NULL) || 588 ((tp->t_flags & TF_SACK_PERMIT) == 0) || 589 (tp->t_state < TCPS_ESTABLISHED)) { 590 /* Nothing on the send map */ 591 activate_rxt: 592 if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) { 593 uint64_t tov; 594 595 time_since_sent = 0; 596 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 597 if (rsm) { 598 idx = rsm->r_rtr_cnt - 1; 599 if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) 600 tstmp_touse = rsm->r_tim_lastsent[idx]; 601 else 602 tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; 603 if (TSTMP_GT(tstmp_touse, cts)) 604 time_since_sent = cts - tstmp_touse; 605 } 606 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RXT; 607 if (tp->t_srtt == 0) 608 tov = BBR_INITIAL_RTO; 609 else 610 tov = ((uint64_t)(TICKS_2_USEC(tp->t_srtt) + 611 ((uint64_t)TICKS_2_USEC(tp->t_rttvar) * (uint64_t)4)) >> TCP_RTT_SHIFT); 612 if (tp->t_rxtshift) 613 tov *= tcp_backoff[tp->t_rxtshift]; 614 if (tov > time_since_sent) 615 tov -= time_since_sent; 616 else 617 tov = bbr->r_ctl.rc_min_to; 618 TCPT_RANGESET_NOSLOP(to, tov, 619 (bbr->r_ctl.rc_min_rto_ms * MS_IN_USEC), 620 (bbr->rc_max_rto_sec * USECS_IN_SECOND)); 621 bbr_log_timer_var(bbr, 2, cts, 0, srtt, 0, to); 622 return (to); 623 } 624 return (0); 625 } 626 if (rsm->r_flags & BBR_ACKED) { 627 rsm = bbr_find_lowest_rsm(bbr); 628 if (rsm == NULL) { 629 /* No lowest? */ 630 goto activate_rxt; 631 } 632 } 633 /* Convert from ms to usecs */ 634 if (rsm->r_flags & BBR_SACK_PASSED) { 635 if ((tp->t_flags & TF_SENTFIN) && 636 ((tp->snd_max - tp->snd_una) == 1) && 637 (rsm->r_flags & BBR_HAS_FIN)) { 638 /* 639 * We don't start a bbr rack timer if all we have is 640 * a FIN outstanding. 641 */ 642 goto activate_rxt; 643 } 644 srtt = bbr_get_rtt(bbr, BBR_RTT_RACK); 645 thresh = bbr_calc_thresh_rack(bbr, srtt, cts, rsm); 646 idx = rsm->r_rtr_cnt - 1; 647 exp = rsm->r_tim_lastsent[idx] + thresh; 648 if (SEQ_GEQ(exp, cts)) { 649 to = exp - cts; 650 if (to < bbr->r_ctl.rc_min_to) { 651 to = bbr->r_ctl.rc_min_to; 652 } 653 } else { 654 to = bbr->r_ctl.rc_min_to; 655 } 656 } else { 657 /* Ok we need to do a TLP not RACK */ 658 if (bbr->rc_tlp_in_progress != 0) { 659 /* 660 * The previous send was a TLP. 661 */ 662 goto activate_rxt; 663 } 664 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); 665 if (rsm == NULL) { 666 /* We found no rsm to TLP with. */ 667 goto activate_rxt; 668 } 669 if (rsm->r_flags & BBR_HAS_FIN) { 670 /* If its a FIN we don't do TLP */ 671 rsm = NULL; 672 goto activate_rxt; 673 } 674 time_since_sent = 0; 675 idx = rsm->r_rtr_cnt - 1; 676 if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) 677 tstmp_touse = rsm->r_tim_lastsent[idx]; 678 else 679 tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; 680 if (TSTMP_GT(tstmp_touse, cts)) 681 time_since_sent = cts - tstmp_touse; 682 is_tlp_timer = 1; 683 srtt = bbr_get_rtt(bbr, bbr_tlp_type_to_use); 684 thresh = bbr_calc_thresh_tlp(tp, bbr, rsm, srtt, cts); 685 if (thresh > time_since_sent) 686 to = thresh - time_since_sent; 687 else 688 to = bbr->r_ctl.rc_min_to; 689 if (to > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 690 /* 691 * If the TLP time works out to larger than the max 692 * RTO lets not do TLP.. just RTO. 693 */ 694 goto activate_rxt; 695 } 696 if ((bbr->rc_tlp_rtx_out == 1) && 697 (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq)) { 698 /* 699 * Second retransmit of the same TLP 700 * lets not. 701 */ 702 bbr->rc_tlp_rtx_out = 0; 703 goto activate_rxt; 704 } 705 if (rsm->r_start != bbr->r_ctl.rc_last_tlp_seq) { 706 /* 707 * The tail is no longer the last one I did a probe 708 * on 709 */ 710 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 711 bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; 712 } 713 } 714 if (is_tlp_timer == 0) { 715 BBR_STAT_INC(bbr_to_arm_rack); 716 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RACK; 717 } else { 718 bbr_log_timer_var(bbr, 1, cts, time_since_sent, srtt, thresh, to); 719 if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { 720 /* 721 * We have exceeded how many times we can retran the 722 * current TLP timer, switch to the RTO timer. 723 */ 724 goto activate_rxt; 725 } else { 726 BBR_STAT_INC(bbr_to_arm_tlp); 727 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_TLP; 728 } 729 } 730 return (to); 731 } 732 733 static inline int32_t 734 bbr_minseg(struct tcp_bbr *bbr) 735 { 736 return (bbr->r_ctl.rc_pace_min_segs - bbr->rc_last_options); 737 } 738 739 static void 740 bbr_start_hpts_timer(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts, int32_t frm, int32_t slot, uint32_t tot_len) 741 { 742 struct inpcb *inp; 743 struct hpts_diag diag; 744 uint32_t delayed_ack = 0; 745 uint32_t left = 0; 746 uint32_t hpts_timeout; 747 uint8_t stopped; 748 int32_t delay_calc = 0; 749 uint32_t prev_delay = 0; 750 751 inp = tp->t_inpcb; 752 if (inp->inp_in_hpts) { 753 /* A previous call is already set up */ 754 return; 755 } 756 if ((tp->t_state == TCPS_CLOSED) || 757 (tp->t_state == TCPS_LISTEN)) { 758 return; 759 } 760 stopped = bbr->rc_tmr_stopped; 761 if (stopped && TSTMP_GT(bbr->r_ctl.rc_timer_exp, cts)) { 762 left = bbr->r_ctl.rc_timer_exp - cts; 763 } 764 bbr->r_ctl.rc_hpts_flags = 0; 765 bbr->r_ctl.rc_timer_exp = 0; 766 prev_delay = bbr->r_ctl.rc_last_delay_val; 767 if (bbr->r_ctl.rc_last_delay_val && 768 (slot == 0)) { 769 /* 770 * If a previous pacer delay was in place we 771 * are not coming from the output side (where 772 * we calculate a delay, more likely a timer). 773 */ 774 slot = bbr->r_ctl.rc_last_delay_val; 775 if (TSTMP_GT(cts, bbr->rc_pacer_started)) { 776 /* Compensate for time passed */ 777 delay_calc = cts - bbr->rc_pacer_started; 778 if (delay_calc <= slot) 779 slot -= delay_calc; 780 } 781 } 782 /* Do we have early to make up for by pushing out the pacing time? */ 783 if (bbr->r_agg_early_set) { 784 bbr_log_pacing_delay_calc(bbr, 0, bbr->r_ctl.rc_agg_early, cts, slot, 0, bbr->r_agg_early_set, 2); 785 slot += bbr->r_ctl.rc_agg_early; 786 bbr->r_ctl.rc_agg_early = 0; 787 bbr->r_agg_early_set = 0; 788 } 789 /* Are we running a total debt that needs to be compensated for? */ 790 if (bbr->r_ctl.rc_hptsi_agg_delay) { 791 if (slot > bbr->r_ctl.rc_hptsi_agg_delay) { 792 /* We nuke the delay */ 793 slot -= bbr->r_ctl.rc_hptsi_agg_delay; 794 bbr->r_ctl.rc_hptsi_agg_delay = 0; 795 } else { 796 /* We nuke some of the delay, put in a minimal 100usecs */ 797 bbr->r_ctl.rc_hptsi_agg_delay -= slot; 798 bbr->r_ctl.rc_last_delay_val = slot = 100; 799 } 800 } 801 bbr->r_ctl.rc_last_delay_val = slot; 802 hpts_timeout = bbr_timer_start(tp, bbr, cts); 803 if (tp->t_flags & TF_DELACK) { 804 if (bbr->rc_in_persist == 0) { 805 delayed_ack = bbr_delack_time; 806 } else { 807 /* 808 * We are in persists and have 809 * gotten a new data element. 810 */ 811 if (hpts_timeout > bbr_delack_time) { 812 /* 813 * Lets make the persists timer (which acks) 814 * be the smaller of hpts_timeout and bbr_delack_time. 815 */ 816 hpts_timeout = bbr_delack_time; 817 } 818 } 819 } 820 if (delayed_ack && 821 ((hpts_timeout == 0) || 822 (delayed_ack < hpts_timeout))) { 823 /* We need a Delayed ack timer */ 824 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 825 hpts_timeout = delayed_ack; 826 } 827 if (slot) { 828 /* Mark that we have a pacing timer up */ 829 BBR_STAT_INC(bbr_paced_segments); 830 bbr->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT; 831 } 832 /* 833 * If no timers are going to run and we will fall off thfe hptsi 834 * wheel, we resort to a keep-alive timer if its configured. 835 */ 836 if ((hpts_timeout == 0) && 837 (slot == 0)) { 838 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && 839 (tp->t_state <= TCPS_CLOSING)) { 840 /* 841 * Ok we have no timer (persists, rack, tlp, rxt or 842 * del-ack), we don't have segments being paced. So 843 * all that is left is the keepalive timer. 844 */ 845 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 846 hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp)); 847 } else { 848 hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp)); 849 } 850 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP; 851 } 852 } 853 if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) == 854 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) { 855 /* 856 * RACK, TLP, persists and RXT timers all are restartable 857 * based on actions input .. i.e we received a packet (ack 858 * or sack) and that changes things (rw, or snd_una etc). 859 * Thus we can restart them with a new value. For 860 * keep-alive, delayed_ack we keep track of what was left 861 * and restart the timer with a smaller value. 862 */ 863 if (left < hpts_timeout) 864 hpts_timeout = left; 865 } 866 if (bbr->r_ctl.rc_incr_tmrs && slot && 867 (bbr->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) { 868 /* 869 * If configured to do so, and the timer is either 870 * the TLP or RXT timer, we need to increase the timeout 871 * by the pacing time. Consider the bottleneck at my 872 * machine as an example, we are sending something 873 * to start a TLP on. The last packet won't be emitted 874 * fully until the pacing time (the bottleneck will hold 875 * the data in place). Once the packet is emitted that 876 * is when we want to start waiting for the TLP. This 877 * is most evident with hardware pacing (where the nic 878 * is holding the packet(s) before emitting). But it 879 * can also show up in the network so we do it for all 880 * cases. Technically we would take off one packet from 881 * this extra delay but this is easier and being more 882 * conservative is probably better. 883 */ 884 hpts_timeout += slot; 885 } 886 if (hpts_timeout) { 887 /* 888 * Hack alert for now we can't time-out over 2147 seconds (a 889 * bit more than 35min) 890 */ 891 if (hpts_timeout > 0x7ffffffe) 892 hpts_timeout = 0x7ffffffe; 893 bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; 894 } else 895 bbr->r_ctl.rc_timer_exp = 0; 896 if ((slot) && 897 (bbr->rc_use_google || 898 bbr->output_error_seen || 899 (slot <= hpts_timeout)) ) { 900 /* 901 * Tell LRO that it can queue packets while 902 * we pace. 903 */ 904 bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; 905 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && 906 (bbr->rc_cwnd_limited == 0)) { 907 /* 908 * If we are not cwnd limited and we 909 * are running a rack timer we put on 910 * the do not disturbe even for sack. 911 */ 912 inp->inp_flags2 |= INP_DONT_SACK_QUEUE; 913 } else 914 inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; 915 bbr->rc_pacer_started = cts; 916 917 (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(slot), 918 __LINE__, &diag); 919 bbr->rc_timer_first = 0; 920 bbr->bbr_timer_src = frm; 921 bbr_log_to_start(bbr, cts, hpts_timeout, slot, 1); 922 bbr_log_hpts_diag(bbr, cts, &diag); 923 } else if (hpts_timeout) { 924 (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(hpts_timeout), 925 __LINE__, &diag); 926 /* 927 * We add the flag here as well if the slot is set, 928 * since hpts will call in to clear the queue first before 929 * calling the output routine (which does our timers). 930 * We don't want to set the flag if its just a timer 931 * else the arrival of data might (that causes us 932 * to send more) might get delayed. Imagine being 933 * on a keep-alive timer and a request comes in for 934 * more data. 935 */ 936 if (slot) 937 bbr->rc_pacer_started = cts; 938 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && 939 (bbr->rc_cwnd_limited == 0)) { 940 /* 941 * For a rack timer, don't wake us even 942 * if a sack arrives as long as we are 943 * not cwnd limited. 944 */ 945 bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; 946 inp->inp_flags2 |= INP_DONT_SACK_QUEUE; 947 } else { 948 /* All other timers wake us up */ 949 bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 950 inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; 951 } 952 bbr->bbr_timer_src = frm; 953 bbr_log_to_start(bbr, cts, hpts_timeout, slot, 0); 954 bbr_log_hpts_diag(bbr, cts, &diag); 955 bbr->rc_timer_first = 1; 956 } 957 bbr->rc_tmr_stopped = 0; 958 bbr_log_type_bbrsnd(bbr, tot_len, slot, delay_calc, cts, frm, prev_delay); 959 } 960 961 static void 962 bbr_timer_audit(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, struct sockbuf *sb) 963 { 964 /* 965 * We received an ack, and then did not call send or were bounced 966 * out due to the hpts was running. Now a timer is up as well, is it 967 * the right timer? 968 */ 969 struct inpcb *inp; 970 struct bbr_sendmap *rsm; 971 uint32_t hpts_timeout; 972 int tmr_up; 973 974 tmr_up = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; 975 if (bbr->rc_in_persist && (tmr_up == PACE_TMR_PERSIT)) 976 return; 977 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 978 if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) && 979 (tmr_up == PACE_TMR_RXT)) { 980 /* Should be an RXT */ 981 return; 982 } 983 inp = bbr->rc_inp; 984 if (rsm == NULL) { 985 /* Nothing outstanding? */ 986 if (tp->t_flags & TF_DELACK) { 987 if (tmr_up == PACE_TMR_DELACK) 988 /* 989 * We are supposed to have delayed ack up 990 * and we do 991 */ 992 return; 993 } else if (sbavail(&inp->inp_socket->so_snd) && 994 (tmr_up == PACE_TMR_RXT)) { 995 /* 996 * if we hit enobufs then we would expect the 997 * possiblity of nothing outstanding and the RXT up 998 * (and the hptsi timer). 999 */ 1000 return; 1001 } else if (((V_tcp_always_keepalive || 1002 inp->inp_socket->so_options & SO_KEEPALIVE) && 1003 (tp->t_state <= TCPS_CLOSING)) && 1004 (tmr_up == PACE_TMR_KEEP) && 1005 (tp->snd_max == tp->snd_una)) { 1006 /* We should have keep alive up and we do */ 1007 return; 1008 } 1009 } 1010 if (rsm && (rsm->r_flags & BBR_SACK_PASSED)) { 1011 if ((tp->t_flags & TF_SENTFIN) && 1012 ((tp->snd_max - tp->snd_una) == 1) && 1013 (rsm->r_flags & BBR_HAS_FIN)) { 1014 /* needs to be a RXT */ 1015 if (tmr_up == PACE_TMR_RXT) 1016 return; 1017 else 1018 goto wrong_timer; 1019 } else if (tmr_up == PACE_TMR_RACK) 1020 return; 1021 else 1022 goto wrong_timer; 1023 } else if (rsm && (tmr_up == PACE_TMR_RACK)) { 1024 /* Rack timer has priority if we have data out */ 1025 return; 1026 } else if (SEQ_GT(tp->snd_max, tp->snd_una) && 1027 ((tmr_up == PACE_TMR_TLP) || 1028 (tmr_up == PACE_TMR_RXT))) { 1029 /* 1030 * Either a TLP or RXT is fine if no sack-passed is in place 1031 * and data is outstanding. 1032 */ 1033 return; 1034 } else if (tmr_up == PACE_TMR_DELACK) { 1035 /* 1036 * If the delayed ack was going to go off before the 1037 * rtx/tlp/rack timer were going to expire, then that would 1038 * be the timer in control. Note we don't check the time 1039 * here trusting the code is correct. 1040 */ 1041 return; 1042 } 1043 if (SEQ_GT(tp->snd_max, tp->snd_una) && 1044 ((tmr_up == PACE_TMR_RXT) || 1045 (tmr_up == PACE_TMR_TLP) || 1046 (tmr_up == PACE_TMR_RACK))) { 1047 /* 1048 * We have outstanding data and 1049 * we *do* have a RACK, TLP or RXT 1050 * timer running. We won't restart 1051 * anything here since thats probably ok we 1052 * will get called with some timer here shortly. 1053 */ 1054 return; 1055 } 1056 /* 1057 * Ok the timer originally started is not what we want now. We will 1058 * force the hpts to be stopped if any, and restart with the slot 1059 * set to what was in the saved slot. 1060 */ 1061 wrong_timer: 1062 if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) { 1063 if (inp->inp_in_hpts) 1064 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 1065 bbr_timer_cancel(bbr, __LINE__, cts); 1066 bbr_start_hpts_timer(bbr, tp, cts, 1, bbr->r_ctl.rc_last_delay_val, 1067 0); 1068 } else { 1069 /* 1070 * Output is hptsi so we just need to switch the type of 1071 * timer. We don't bother with keep-alive, since when we 1072 * jump through the output, it will start the keep-alive if 1073 * nothing is sent. 1074 * 1075 * We only need a delayed-ack added and or the hpts_timeout. 1076 */ 1077 hpts_timeout = bbr_timer_start(tp, bbr, cts); 1078 if (tp->t_flags & TF_DELACK) { 1079 if (hpts_timeout == 0) { 1080 hpts_timeout = bbr_delack_time; 1081 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 1082 } 1083 else if (hpts_timeout > bbr_delack_time) { 1084 hpts_timeout = bbr_delack_time; 1085 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 1086 } 1087 } 1088 if (hpts_timeout) { 1089 if (hpts_timeout > 0x7ffffffe) 1090 hpts_timeout = 0x7ffffffe; 1091 bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; 1092 } 1093 } 1094 } 1095 1096 int32_t bbr_clear_lost = 0; 1097 1098 /* 1099 * Considers the two time values now (cts) and earlier. 1100 * If cts is smaller than earlier, we could have 1101 * had a sequence wrap (our counter wraps every 1102 * 70 min or so) or it could be just clock skew 1103 * getting us two differnt time values. Clock skew 1104 * will show up within 10ms or so. So in such 1105 * a case (where cts is behind earlier time by 1106 * less than 10ms) we return 0. Otherwise we 1107 * return the true difference between them. 1108 */ 1109 static inline uint32_t 1110 bbr_calc_time(uint32_t cts, uint32_t earlier_time) { 1111 /* 1112 * Given two timestamps, the current time stamp cts, and some other 1113 * time-stamp taken in theory earlier return the difference. The 1114 * trick is here sometimes locking will get the other timestamp 1115 * after the cts. If this occurs we need to return 0. 1116 */ 1117 if (TSTMP_GEQ(cts, earlier_time)) 1118 return (cts - earlier_time); 1119 /* 1120 * cts is behind earlier_time if its less than 10ms consider it 0. 1121 * If its more than 10ms difference then we had a time wrap. Else 1122 * its just the normal locking foo. I wonder if we should not go to 1123 * 64bit TS and get rid of this issue. 1124 */ 1125 if (TSTMP_GEQ((cts + 10000), earlier_time)) 1126 return (0); 1127 /* 1128 * Ok the time must have wrapped. So we need to answer a large 1129 * amount of time, which the normal subtraction should do. 1130 */ 1131 return (cts - earlier_time); 1132 } 1133 1134 1135 1136 static int 1137 sysctl_bbr_clear_lost(SYSCTL_HANDLER_ARGS) 1138 { 1139 uint32_t stat; 1140 int32_t error; 1141 1142 error = SYSCTL_OUT(req, &bbr_clear_lost, sizeof(uint32_t)); 1143 if (error || req->newptr == NULL) 1144 return error; 1145 1146 error = SYSCTL_IN(req, &stat, sizeof(uint32_t)); 1147 if (error) 1148 return (error); 1149 if (stat == 1) { 1150 #ifdef BBR_INVARIANTS 1151 printf("Clearing BBR lost counters\n"); 1152 #endif 1153 COUNTER_ARRAY_ZERO(bbr_state_lost, BBR_MAX_STAT); 1154 COUNTER_ARRAY_ZERO(bbr_state_time, BBR_MAX_STAT); 1155 COUNTER_ARRAY_ZERO(bbr_state_resend, BBR_MAX_STAT); 1156 } else if (stat == 2) { 1157 #ifdef BBR_INVARIANTS 1158 printf("Clearing BBR option counters\n"); 1159 #endif 1160 COUNTER_ARRAY_ZERO(bbr_opts_arry, BBR_OPTS_SIZE); 1161 } else if (stat == 3) { 1162 #ifdef BBR_INVARIANTS 1163 printf("Clearing BBR stats counters\n"); 1164 #endif 1165 COUNTER_ARRAY_ZERO(bbr_stat_arry, BBR_STAT_SIZE); 1166 } else if (stat == 4) { 1167 #ifdef BBR_INVARIANTS 1168 printf("Clearing BBR out-size counters\n"); 1169 #endif 1170 COUNTER_ARRAY_ZERO(bbr_out_size, TCP_MSS_ACCT_SIZE); 1171 } 1172 bbr_clear_lost = 0; 1173 return (0); 1174 } 1175 1176 static void 1177 bbr_init_sysctls(void) 1178 { 1179 struct sysctl_oid *bbr_probertt; 1180 struct sysctl_oid *bbr_hptsi; 1181 struct sysctl_oid *bbr_measure; 1182 struct sysctl_oid *bbr_cwnd; 1183 struct sysctl_oid *bbr_timeout; 1184 struct sysctl_oid *bbr_states; 1185 struct sysctl_oid *bbr_startup; 1186 struct sysctl_oid *bbr_policer; 1187 1188 /* Probe rtt controls */ 1189 bbr_probertt = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1190 SYSCTL_CHILDREN(bbr_sysctl_root), 1191 OID_AUTO, 1192 "probertt", 1193 CTLFLAG_RW, 0, 1194 ""); 1195 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1196 SYSCTL_CHILDREN(bbr_probertt), 1197 OID_AUTO, "gain", CTLFLAG_RW, 1198 &bbr_rttprobe_gain, 192, 1199 "What is the filter gain drop in probe_rtt (0=disable)?"); 1200 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1201 SYSCTL_CHILDREN(bbr_probertt), 1202 OID_AUTO, "cwnd", CTLFLAG_RW, 1203 &bbr_rtt_probe_cwndtarg, 4, 1204 "How many mss's are outstanding during probe-rtt"); 1205 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1206 SYSCTL_CHILDREN(bbr_probertt), 1207 OID_AUTO, "int", CTLFLAG_RW, 1208 &bbr_rtt_probe_limit, 4000000, 1209 "If RTT has not shrank in this many micro-seconds enter probe-rtt"); 1210 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1211 SYSCTL_CHILDREN(bbr_probertt), 1212 OID_AUTO, "mintime", CTLFLAG_RW, 1213 &bbr_rtt_probe_time, 200000, 1214 "How many microseconds in probe-rtt"); 1215 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1216 SYSCTL_CHILDREN(bbr_probertt), 1217 OID_AUTO, "filter_len_sec", CTLFLAG_RW, 1218 &bbr_filter_len_sec, 6, 1219 "How long in seconds does the rttProp filter run?"); 1220 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1221 SYSCTL_CHILDREN(bbr_probertt), 1222 OID_AUTO, "drain_rtt", CTLFLAG_RW, 1223 &bbr_drain_rtt, BBR_SRTT, 1224 "What is the drain rtt to use in probeRTT (rtt_prop=0, rtt_rack=1, rtt_pkt=2, rtt_srtt=3?"); 1225 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1226 SYSCTL_CHILDREN(bbr_probertt), 1227 OID_AUTO, "can_force", CTLFLAG_RW, 1228 &bbr_can_force_probertt, 0, 1229 "If we keep setting new low rtt's but delay going in probe-rtt can we force in??"); 1230 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1231 SYSCTL_CHILDREN(bbr_probertt), 1232 OID_AUTO, "enter_sets_force", CTLFLAG_RW, 1233 &bbr_probertt_sets_rtt, 0, 1234 "In NF mode, do we imitate google_mode and set the rttProp on entry to probe-rtt?"); 1235 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1236 SYSCTL_CHILDREN(bbr_probertt), 1237 OID_AUTO, "can_adjust", CTLFLAG_RW, 1238 &bbr_can_adjust_probertt, 1, 1239 "Can we dynamically adjust the probe-rtt limits and times?"); 1240 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1241 SYSCTL_CHILDREN(bbr_probertt), 1242 OID_AUTO, "is_ratio", CTLFLAG_RW, 1243 &bbr_is_ratio, 0, 1244 "is the limit to filter a ratio?"); 1245 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1246 SYSCTL_CHILDREN(bbr_probertt), 1247 OID_AUTO, "use_cwnd", CTLFLAG_RW, 1248 &bbr_prtt_slam_cwnd, 0, 1249 "Should we set/recover cwnd?"); 1250 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1251 SYSCTL_CHILDREN(bbr_probertt), 1252 OID_AUTO, "can_use_ts", CTLFLAG_RW, 1253 &bbr_can_use_ts_for_rtt, 1, 1254 "Can we use the ms timestamp if available for retransmistted rtt calculations?"); 1255 1256 /* Pacing controls */ 1257 bbr_hptsi = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1258 SYSCTL_CHILDREN(bbr_sysctl_root), 1259 OID_AUTO, 1260 "pacing", 1261 CTLFLAG_RW, 0, 1262 ""); 1263 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1264 SYSCTL_CHILDREN(bbr_hptsi), 1265 OID_AUTO, "hw_pacing", CTLFLAG_RW, 1266 &bbr_allow_hdwr_pacing, 1, 1267 "Do we allow hardware pacing?"); 1268 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1269 SYSCTL_CHILDREN(bbr_hptsi), 1270 OID_AUTO, "hw_pacing_limit", CTLFLAG_RW, 1271 &bbr_hardware_pacing_limit, 4000, 1272 "Do we have a limited number of connections for pacing chelsio (0=no limit)?"); 1273 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1274 SYSCTL_CHILDREN(bbr_hptsi), 1275 OID_AUTO, "hw_pacing_adj", CTLFLAG_RW, 1276 &bbr_hdwr_pace_adjust, 2, 1277 "Multiplier to calculated tso size?"); 1278 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1279 SYSCTL_CHILDREN(bbr_hptsi), 1280 OID_AUTO, "hw_pacing_floor", CTLFLAG_RW, 1281 &bbr_hdwr_pace_floor, 1, 1282 "Do we invoke the hardware pacing floor?"); 1283 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1284 SYSCTL_CHILDREN(bbr_hptsi), 1285 OID_AUTO, "hw_pacing_delay_cnt", CTLFLAG_RW, 1286 &bbr_hdwr_pacing_delay_cnt, 10, 1287 "How many packets must be sent after hdwr pacing is enabled"); 1288 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1289 SYSCTL_CHILDREN(bbr_hptsi), 1290 OID_AUTO, "bw_cross", CTLFLAG_RW, 1291 &bbr_cross_over, 3000000, 1292 "What is the point where we cross over to linux like TSO size set"); 1293 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1294 SYSCTL_CHILDREN(bbr_hptsi), 1295 OID_AUTO, "seg_deltarg", CTLFLAG_RW, 1296 &bbr_hptsi_segments_delay_tar, 7000, 1297 "What is the worse case delay target for hptsi < 48Mbp connections"); 1298 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1299 SYSCTL_CHILDREN(bbr_hptsi), 1300 OID_AUTO, "enet_oh", CTLFLAG_RW, 1301 &bbr_include_enet_oh, 0, 1302 "Do we include the ethernet overhead in calculating pacing delay?"); 1303 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1304 SYSCTL_CHILDREN(bbr_hptsi), 1305 OID_AUTO, "ip_oh", CTLFLAG_RW, 1306 &bbr_include_ip_oh, 1, 1307 "Do we include the IP overhead in calculating pacing delay?"); 1308 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1309 SYSCTL_CHILDREN(bbr_hptsi), 1310 OID_AUTO, "tcp_oh", CTLFLAG_RW, 1311 &bbr_include_tcp_oh, 0, 1312 "Do we include the TCP overhead in calculating pacing delay?"); 1313 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1314 SYSCTL_CHILDREN(bbr_hptsi), 1315 OID_AUTO, "google_discount", CTLFLAG_RW, 1316 &bbr_google_discount, 10, 1317 "What is the default google discount percentage wise for pacing (11 = 1.1%%)?"); 1318 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1319 SYSCTL_CHILDREN(bbr_hptsi), 1320 OID_AUTO, "all_get_min", CTLFLAG_RW, 1321 &bbr_all_get_min, 0, 1322 "If you are less than a MSS do you just get the min?"); 1323 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1324 SYSCTL_CHILDREN(bbr_hptsi), 1325 OID_AUTO, "tso_min", CTLFLAG_RW, 1326 &bbr_hptsi_bytes_min, 1460, 1327 "For 0 -> 24Mbps what is floor number of segments for TSO"); 1328 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1329 SYSCTL_CHILDREN(bbr_hptsi), 1330 OID_AUTO, "seg_tso_max", CTLFLAG_RW, 1331 &bbr_hptsi_segments_max, 6, 1332 "For 0 -> 24Mbps what is top number of segments for TSO"); 1333 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1334 SYSCTL_CHILDREN(bbr_hptsi), 1335 OID_AUTO, "seg_floor", CTLFLAG_RW, 1336 &bbr_hptsi_segments_floor, 1, 1337 "Minimum TSO size we will fall too in segments"); 1338 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1339 SYSCTL_CHILDREN(bbr_hptsi), 1340 OID_AUTO, "utter_max", CTLFLAG_RW, 1341 &bbr_hptsi_utter_max, 0, 1342 "The absolute maximum that any pacing (outside of hardware) can be"); 1343 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1344 SYSCTL_CHILDREN(bbr_hptsi), 1345 OID_AUTO, "seg_divisor", CTLFLAG_RW, 1346 &bbr_hptsi_per_second, 100, 1347 "What is the divisor in our hptsi TSO calculation 512Mbps < X > 24Mbps "); 1348 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1349 SYSCTL_CHILDREN(bbr_hptsi), 1350 OID_AUTO, "srtt_mul", CTLFLAG_RW, 1351 &bbr_hptsi_max_mul, 1, 1352 "The multiplier for pace len max"); 1353 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1354 SYSCTL_CHILDREN(bbr_hptsi), 1355 OID_AUTO, "srtt_div", CTLFLAG_RW, 1356 &bbr_hptsi_max_div, 2, 1357 "The divisor for pace len max"); 1358 /* Measurement controls */ 1359 bbr_measure = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1360 SYSCTL_CHILDREN(bbr_sysctl_root), 1361 OID_AUTO, 1362 "measure", 1363 CTLFLAG_RW, 0, 1364 "Measurement controls"); 1365 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1366 SYSCTL_CHILDREN(bbr_measure), 1367 OID_AUTO, "min_i_bw", CTLFLAG_RW, 1368 &bbr_initial_bw_bps, 62500, 1369 "Minimum initial b/w in bytes per second"); 1370 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1371 SYSCTL_CHILDREN(bbr_measure), 1372 OID_AUTO, "no_sack_needed", CTLFLAG_RW, 1373 &bbr_sack_not_required, 0, 1374 "Do we allow bbr to run on connections not supporting SACK?"); 1375 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1376 SYSCTL_CHILDREN(bbr_measure), 1377 OID_AUTO, "use_google", CTLFLAG_RW, 1378 &bbr_use_google_algo, 0, 1379 "Use has close to google V1.0 has possible?"); 1380 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1381 SYSCTL_CHILDREN(bbr_measure), 1382 OID_AUTO, "ts_limiting", CTLFLAG_RW, 1383 &bbr_ts_limiting, 1, 1384 "Do we attempt to use the peers timestamp to limit b/w caculations?"); 1385 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1386 SYSCTL_CHILDREN(bbr_measure), 1387 OID_AUTO, "ts_can_raise", CTLFLAG_RW, 1388 &bbr_ts_can_raise, 0, 1389 "Can we raise the b/w via timestamp b/w calculation?"); 1390 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1391 SYSCTL_CHILDREN(bbr_measure), 1392 OID_AUTO, "ts_delta", CTLFLAG_RW, 1393 &bbr_min_usec_delta, 20000, 1394 "How long in usec between ts of our sends in ts validation code?"); 1395 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1396 SYSCTL_CHILDREN(bbr_measure), 1397 OID_AUTO, "ts_peer_delta", CTLFLAG_RW, 1398 &bbr_min_peer_delta, 20, 1399 "What min numerical value should be between the peer deltas?"); 1400 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1401 SYSCTL_CHILDREN(bbr_measure), 1402 OID_AUTO, "ts_delta_percent", CTLFLAG_RW, 1403 &bbr_delta_percent, 150, 1404 "What percentage (150 = 15.0) do we allow variance for?"); 1405 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1406 SYSCTL_CHILDREN(bbr_measure), 1407 OID_AUTO, "min_measure_good_bw", CTLFLAG_RW, 1408 &bbr_min_measurements_req, 1, 1409 "What is the minimum measurment count we need before we switch to our b/w estimate"); 1410 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1411 SYSCTL_CHILDREN(bbr_measure), 1412 OID_AUTO, "min_measure_before_pace", CTLFLAG_RW, 1413 &bbr_no_pacing_until, 4, 1414 "How many pkt-epoch's (0 is off) do we need before pacing is on?"); 1415 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1416 SYSCTL_CHILDREN(bbr_measure), 1417 OID_AUTO, "quanta", CTLFLAG_RW, 1418 &bbr_quanta, 2, 1419 "Extra quanta to add when calculating the target (ID section 4.2.3.2)."); 1420 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1421 SYSCTL_CHILDREN(bbr_measure), 1422 OID_AUTO, "noretran", CTLFLAG_RW, 1423 &bbr_no_retran, 0, 1424 "Should google mode not use retransmission measurements for the b/w estimation?"); 1425 /* State controls */ 1426 bbr_states = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1427 SYSCTL_CHILDREN(bbr_sysctl_root), 1428 OID_AUTO, 1429 "states", 1430 CTLFLAG_RW, 0, 1431 "State controls"); 1432 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1433 SYSCTL_CHILDREN(bbr_states), 1434 OID_AUTO, "idle_restart", CTLFLAG_RW, 1435 &bbr_uses_idle_restart, 0, 1436 "Do we use a new special idle_restart state to ramp back up quickly?"); 1437 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1438 SYSCTL_CHILDREN(bbr_states), 1439 OID_AUTO, "idle_restart_threshold", CTLFLAG_RW, 1440 &bbr_idle_restart_threshold, 100000, 1441 "How long must we be idle before we restart??"); 1442 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1443 SYSCTL_CHILDREN(bbr_states), 1444 OID_AUTO, "use_pkt_epoch", CTLFLAG_RW, 1445 &bbr_state_is_pkt_epoch, 0, 1446 "Do we use a pkt-epoch for substate if 0 rttProp?"); 1447 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1448 SYSCTL_CHILDREN(bbr_states), 1449 OID_AUTO, "startup_rtt_gain", CTLFLAG_RW, 1450 &bbr_rtt_gain_thresh, 0, 1451 "What increase in RTT triggers us to stop ignoring no-loss and possibly exit startup?"); 1452 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1453 SYSCTL_CHILDREN(bbr_states), 1454 OID_AUTO, "drain_floor", CTLFLAG_RW, 1455 &bbr_drain_floor, 88, 1456 "What is the lowest we can drain (pg) too?"); 1457 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1458 SYSCTL_CHILDREN(bbr_states), 1459 OID_AUTO, "drain_2_target", CTLFLAG_RW, 1460 &bbr_state_drain_2_tar, 1, 1461 "Do we drain to target in drain substate?"); 1462 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1463 SYSCTL_CHILDREN(bbr_states), 1464 OID_AUTO, "gain_2_target", CTLFLAG_RW, 1465 &bbr_gain_to_target, 1, 1466 "Does probe bw gain to target??"); 1467 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1468 SYSCTL_CHILDREN(bbr_states), 1469 OID_AUTO, "gain_extra_time", CTLFLAG_RW, 1470 &bbr_gain_gets_extra_too, 1, 1471 "Does probe bw gain get the extra time too?"); 1472 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1473 SYSCTL_CHILDREN(bbr_states), 1474 OID_AUTO, "ld_div", CTLFLAG_RW, 1475 &bbr_drain_drop_div, 5, 1476 "Long drain drop divider?"); 1477 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1478 SYSCTL_CHILDREN(bbr_states), 1479 OID_AUTO, "ld_mul", CTLFLAG_RW, 1480 &bbr_drain_drop_mul, 4, 1481 "Long drain drop multiplier?"); 1482 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1483 SYSCTL_CHILDREN(bbr_states), 1484 OID_AUTO, "rand_ot_disc", CTLFLAG_RW, 1485 &bbr_rand_ot, 50, 1486 "Random discount of the ot?"); 1487 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1488 SYSCTL_CHILDREN(bbr_states), 1489 OID_AUTO, "dr_filter_life", CTLFLAG_RW, 1490 &bbr_num_pktepo_for_del_limit, BBR_NUM_RTTS_FOR_DEL_LIMIT, 1491 "How many packet-epochs does the b/w delivery rate last?"); 1492 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1493 SYSCTL_CHILDREN(bbr_states), 1494 OID_AUTO, "subdrain_applimited", CTLFLAG_RW, 1495 &bbr_sub_drain_app_limit, 0, 1496 "Does our sub-state drain invoke app limited if its long?"); 1497 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1498 SYSCTL_CHILDREN(bbr_states), 1499 OID_AUTO, "use_cwnd_subdrain", CTLFLAG_RW, 1500 &bbr_sub_drain_slam_cwnd, 0, 1501 "Should we set/recover cwnd for sub-state drain?"); 1502 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1503 SYSCTL_CHILDREN(bbr_states), 1504 OID_AUTO, "use_cwnd_maindrain", CTLFLAG_RW, 1505 &bbr_slam_cwnd_in_main_drain, 0, 1506 "Should we set/recover cwnd for main-state drain?"); 1507 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1508 SYSCTL_CHILDREN(bbr_states), 1509 OID_AUTO, "google_gets_earlyout", CTLFLAG_RW, 1510 &google_allow_early_out, 1, 1511 "Should we allow google probe-bw/drain to exit early at flight target?"); 1512 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1513 SYSCTL_CHILDREN(bbr_states), 1514 OID_AUTO, "google_exit_loss", CTLFLAG_RW, 1515 &google_consider_lost, 1, 1516 "Should we have losses exit gain of probebw in google mode??"); 1517 /* Startup controls */ 1518 bbr_startup = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1519 SYSCTL_CHILDREN(bbr_sysctl_root), 1520 OID_AUTO, 1521 "startup", 1522 CTLFLAG_RW, 0, 1523 "Startup controls"); 1524 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1525 SYSCTL_CHILDREN(bbr_startup), 1526 OID_AUTO, "cheat_iwnd", CTLFLAG_RW, 1527 &bbr_sends_full_iwnd, 1, 1528 "Do we not pace but burst out initial windows has our TSO size?"); 1529 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1530 SYSCTL_CHILDREN(bbr_startup), 1531 OID_AUTO, "loss_threshold", CTLFLAG_RW, 1532 &bbr_startup_loss_thresh, 2000, 1533 "In startup what is the loss threshold in a pe that will exit us from startup?"); 1534 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1535 SYSCTL_CHILDREN(bbr_startup), 1536 OID_AUTO, "use_lowerpg", CTLFLAG_RW, 1537 &bbr_use_lower_gain_in_startup, 1, 1538 "Should we use a lower hptsi gain if we see loss in startup?"); 1539 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1540 SYSCTL_CHILDREN(bbr_startup), 1541 OID_AUTO, "gain", CTLFLAG_RW, 1542 &bbr_start_exit, 25, 1543 "What gain percent do we need to see to stay in startup??"); 1544 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1545 SYSCTL_CHILDREN(bbr_startup), 1546 OID_AUTO, "low_gain", CTLFLAG_RW, 1547 &bbr_low_start_exit, 15, 1548 "What gain percent do we need to see to stay in the lower gain startup??"); 1549 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1550 SYSCTL_CHILDREN(bbr_startup), 1551 OID_AUTO, "loss_exit", CTLFLAG_RW, 1552 &bbr_exit_startup_at_loss, 1, 1553 "Should we exit startup at loss in an epoch if we are not gaining?"); 1554 /* CWND controls */ 1555 bbr_cwnd = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1556 SYSCTL_CHILDREN(bbr_sysctl_root), 1557 OID_AUTO, 1558 "cwnd", 1559 CTLFLAG_RW, 0, 1560 "Cwnd controls"); 1561 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1562 SYSCTL_CHILDREN(bbr_cwnd), 1563 OID_AUTO, "tar_rtt", CTLFLAG_RW, 1564 &bbr_cwndtarget_rtt_touse, 0, 1565 "Target cwnd rtt measurment to use (0=rtt_prop, 1=rtt_rack, 2=pkt_rtt, 3=srtt)?"); 1566 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1567 SYSCTL_CHILDREN(bbr_cwnd), 1568 OID_AUTO, "may_shrink", CTLFLAG_RW, 1569 &bbr_cwnd_may_shrink, 0, 1570 "Can the cwnd shrink if it would grow to more than the target?"); 1571 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1572 SYSCTL_CHILDREN(bbr_cwnd), 1573 OID_AUTO, "max_target_limit", CTLFLAG_RW, 1574 &bbr_target_cwnd_mult_limit, 8, 1575 "Do we limit the cwnd to some multiple of the cwnd target if cwnd can't shrink 0=no?"); 1576 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1577 SYSCTL_CHILDREN(bbr_cwnd), 1578 OID_AUTO, "highspeed_min", CTLFLAG_RW, 1579 &bbr_cwnd_min_val_hs, BBR_HIGHSPEED_NUM_MSS, 1580 "What is the high-speed min cwnd (rttProp under 1ms)"); 1581 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1582 SYSCTL_CHILDREN(bbr_cwnd), 1583 OID_AUTO, "lowspeed_min", CTLFLAG_RW, 1584 &bbr_cwnd_min_val, BBR_PROBERTT_NUM_MSS, 1585 "What is the min cwnd (rttProp > 1ms)"); 1586 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1587 SYSCTL_CHILDREN(bbr_cwnd), 1588 OID_AUTO, "initwin", CTLFLAG_RW, 1589 &bbr_def_init_win, 10, 1590 "What is the BBR initial window, if 0 use tcp version"); 1591 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1592 SYSCTL_CHILDREN(bbr_cwnd), 1593 OID_AUTO, "do_loss_red", CTLFLAG_RW, 1594 &bbr_do_red, 600, 1595 "Do we reduce the b/w at exit from recovery based on ratio of prop/srtt (800=80.0, 0=off)?"); 1596 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1597 SYSCTL_CHILDREN(bbr_cwnd), 1598 OID_AUTO, "red_scale", CTLFLAG_RW, 1599 &bbr_red_scale, 20000, 1600 "What RTT do we scale with?"); 1601 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1602 SYSCTL_CHILDREN(bbr_cwnd), 1603 OID_AUTO, "red_growslow", CTLFLAG_RW, 1604 &bbr_red_growth_restrict, 1, 1605 "Do we restrict cwnd growth for whats in flight?"); 1606 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1607 SYSCTL_CHILDREN(bbr_cwnd), 1608 OID_AUTO, "red_div", CTLFLAG_RW, 1609 &bbr_red_div, 2, 1610 "If we reduce whats the divisor?"); 1611 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1612 SYSCTL_CHILDREN(bbr_cwnd), 1613 OID_AUTO, "red_mul", CTLFLAG_RW, 1614 &bbr_red_mul, 1, 1615 "If we reduce whats the mulitiplier?"); 1616 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1617 SYSCTL_CHILDREN(bbr_cwnd), 1618 OID_AUTO, "target_is_unit", CTLFLAG_RW, 1619 &bbr_target_is_bbunit, 0, 1620 "Is the state target the pacing_gain or BBR_UNIT?"); 1621 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1622 SYSCTL_CHILDREN(bbr_cwnd), 1623 OID_AUTO, "drop_limit", CTLFLAG_RW, 1624 &bbr_drop_limit, 0, 1625 "Number of segments limit for drop (0=use min_cwnd w/flight)?"); 1626 1627 /* Timeout controls */ 1628 bbr_timeout = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1629 SYSCTL_CHILDREN(bbr_sysctl_root), 1630 OID_AUTO, 1631 "timeout", 1632 CTLFLAG_RW, 0, 1633 "Time out controls"); 1634 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1635 SYSCTL_CHILDREN(bbr_timeout), 1636 OID_AUTO, "delack", CTLFLAG_RW, 1637 &bbr_delack_time, 100000, 1638 "BBR's delayed ack time"); 1639 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1640 SYSCTL_CHILDREN(bbr_timeout), 1641 OID_AUTO, "tlp_uses", CTLFLAG_RW, 1642 &bbr_tlp_type_to_use, 3, 1643 "RTT that TLP uses in its calculations, 0=rttProp, 1=Rack_rtt, 2=pkt_rtt and 3=srtt"); 1644 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1645 SYSCTL_CHILDREN(bbr_timeout), 1646 OID_AUTO, "persmin", CTLFLAG_RW, 1647 &bbr_persist_min, 250000, 1648 "What is the minimum time in microseconds between persists"); 1649 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1650 SYSCTL_CHILDREN(bbr_timeout), 1651 OID_AUTO, "persmax", CTLFLAG_RW, 1652 &bbr_persist_max, 1000000, 1653 "What is the largest delay in microseconds between persists"); 1654 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1655 SYSCTL_CHILDREN(bbr_timeout), 1656 OID_AUTO, "tlp_minto", CTLFLAG_RW, 1657 &bbr_tlp_min, 10000, 1658 "TLP Min timeout in usecs"); 1659 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1660 SYSCTL_CHILDREN(bbr_timeout), 1661 OID_AUTO, "tlp_dack_time", CTLFLAG_RW, 1662 &bbr_delayed_ack_time, 200000, 1663 "TLP delayed ack compensation value"); 1664 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1665 SYSCTL_CHILDREN(bbr_sysctl_root), 1666 OID_AUTO, "minrto", CTLFLAG_RW, 1667 &bbr_rto_min_ms, 30, 1668 "Minimum RTO in ms"); 1669 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1670 SYSCTL_CHILDREN(bbr_timeout), 1671 OID_AUTO, "maxrto", CTLFLAG_RW, 1672 &bbr_rto_max_sec, 4, 1673 "Maxiumum RTO in seconds -- should be at least as large as min_rto"); 1674 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1675 SYSCTL_CHILDREN(bbr_timeout), 1676 OID_AUTO, "tlp_retry", CTLFLAG_RW, 1677 &bbr_tlp_max_resend, 2, 1678 "How many times does TLP retry a single segment or multiple with no ACK"); 1679 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1680 SYSCTL_CHILDREN(bbr_timeout), 1681 OID_AUTO, "minto", CTLFLAG_RW, 1682 &bbr_min_to, 1000, 1683 "Minimum rack timeout in useconds"); 1684 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1685 SYSCTL_CHILDREN(bbr_timeout), 1686 OID_AUTO, "pktdelay", CTLFLAG_RW, 1687 &bbr_pkt_delay, 1000, 1688 "Extra RACK time (in useconds) besides reordering thresh"); 1689 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1690 SYSCTL_CHILDREN(bbr_timeout), 1691 OID_AUTO, "incr_tmrs", CTLFLAG_RW, 1692 &bbr_incr_timers, 1, 1693 "Increase the RXT/TLP timer by the pacing time used?"); 1694 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1695 SYSCTL_CHILDREN(bbr_timeout), 1696 OID_AUTO, "rxtmark_sackpassed", CTLFLAG_RW, 1697 &bbr_marks_rxt_sack_passed, 0, 1698 "Mark sack passed on all those not ack'd when a RXT hits?"); 1699 /* Policer controls */ 1700 bbr_policer = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1701 SYSCTL_CHILDREN(bbr_sysctl_root), 1702 OID_AUTO, 1703 "policer", 1704 CTLFLAG_RW, 0, 1705 "Policer controls"); 1706 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1707 SYSCTL_CHILDREN(bbr_policer), 1708 OID_AUTO, "detect_enable", CTLFLAG_RW, 1709 &bbr_policer_detection_enabled, 1, 1710 "Is policer detection enabled??"); 1711 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1712 SYSCTL_CHILDREN(bbr_policer), 1713 OID_AUTO, "min_pes", CTLFLAG_RW, 1714 &bbr_lt_intvl_min_rtts, 4, 1715 "Minimum number of PE's?"); 1716 SYSCTL_ADD_U64(&bbr_sysctl_ctx, 1717 SYSCTL_CHILDREN(bbr_policer), 1718 OID_AUTO, "bwdiff", CTLFLAG_RW, 1719 &bbr_lt_bw_diff, (4000/8), 1720 "Minimal bw diff?"); 1721 SYSCTL_ADD_U64(&bbr_sysctl_ctx, 1722 SYSCTL_CHILDREN(bbr_policer), 1723 OID_AUTO, "bwratio", CTLFLAG_RW, 1724 &bbr_lt_bw_ratio, 8, 1725 "Minimal bw diff?"); 1726 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1727 SYSCTL_CHILDREN(bbr_policer), 1728 OID_AUTO, "from_rack_rxt", CTLFLAG_RW, 1729 &bbr_policer_call_from_rack_to, 0, 1730 "Do we call the policer detection code from a rack-timeout?"); 1731 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1732 SYSCTL_CHILDREN(bbr_policer), 1733 OID_AUTO, "false_postive", CTLFLAG_RW, 1734 &bbr_lt_intvl_fp, 0, 1735 "What packet epoch do we do false-postive detection at (0=no)?"); 1736 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1737 SYSCTL_CHILDREN(bbr_policer), 1738 OID_AUTO, "loss_thresh", CTLFLAG_RW, 1739 &bbr_lt_loss_thresh, 196, 1740 "Loss threshold 196 = 19.6%?"); 1741 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1742 SYSCTL_CHILDREN(bbr_policer), 1743 OID_AUTO, "false_postive_thresh", CTLFLAG_RW, 1744 &bbr_lt_fd_thresh, 100, 1745 "What percentage is the false detection threshold (150=15.0)?"); 1746 /* All the rest */ 1747 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1748 SYSCTL_CHILDREN(bbr_sysctl_root), 1749 OID_AUTO, "cheat_rxt", CTLFLAG_RW, 1750 &bbr_use_rack_resend_cheat, 0, 1751 "Do we burst 1ms between sends on retransmissions (like rack)?"); 1752 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1753 SYSCTL_CHILDREN(bbr_sysctl_root), 1754 OID_AUTO, "error_paceout", CTLFLAG_RW, 1755 &bbr_error_base_paceout, 10000, 1756 "When we hit an error what is the min to pace out in usec's?"); 1757 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1758 SYSCTL_CHILDREN(bbr_sysctl_root), 1759 OID_AUTO, "kill_paceout", CTLFLAG_RW, 1760 &bbr_max_net_error_cnt, 10, 1761 "When we hit this many errors in a row, kill the session?"); 1762 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1763 SYSCTL_CHILDREN(bbr_sysctl_root), 1764 OID_AUTO, "data_after_close", CTLFLAG_RW, 1765 &bbr_ignore_data_after_close, 1, 1766 "Do we hold off sending a RST until all pending data is ack'd"); 1767 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1768 SYSCTL_CHILDREN(bbr_sysctl_root), 1769 OID_AUTO, "resend_use_tso", CTLFLAG_RW, 1770 &bbr_resends_use_tso, 0, 1771 "Can resends use TSO?"); 1772 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1773 SYSCTL_CHILDREN(bbr_sysctl_root), 1774 OID_AUTO, "sblklimit", CTLFLAG_RW, 1775 &bbr_sack_block_limit, 128, 1776 "When do we start ignoring small sack blocks"); 1777 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1778 SYSCTL_CHILDREN(bbr_sysctl_root), 1779 OID_AUTO, "bb_verbose", CTLFLAG_RW, 1780 &bbr_verbose_logging, 0, 1781 "Should BBR black box logging be verbose"); 1782 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1783 SYSCTL_CHILDREN(bbr_sysctl_root), 1784 OID_AUTO, "reorder_thresh", CTLFLAG_RW, 1785 &bbr_reorder_thresh, 2, 1786 "What factor for rack will be added when seeing reordering (shift right)"); 1787 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1788 SYSCTL_CHILDREN(bbr_sysctl_root), 1789 OID_AUTO, "reorder_fade", CTLFLAG_RW, 1790 &bbr_reorder_fade, 0, 1791 "Does reorder detection fade, if so how many ms (0 means never)"); 1792 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1793 SYSCTL_CHILDREN(bbr_sysctl_root), 1794 OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW, 1795 &bbr_tlp_thresh, 1, 1796 "what divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)"); 1797 /* Stats and counters */ 1798 /* The pacing counters for hdwr/software can't be in the array */ 1799 bbr_nohdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); 1800 bbr_hdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); 1801 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1802 SYSCTL_CHILDREN(bbr_sysctl_root), 1803 OID_AUTO, "enob_hdwr_pacing", CTLFLAG_RD, 1804 &bbr_hdwr_pacing_enobuf, 1805 "Total number of enobufs for hardware paced flows"); 1806 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1807 SYSCTL_CHILDREN(bbr_sysctl_root), 1808 OID_AUTO, "enob_no_hdwr_pacing", CTLFLAG_RD, 1809 &bbr_nohdwr_pacing_enobuf, 1810 "Total number of enobufs for non-hardware paced flows"); 1811 1812 1813 bbr_flows_whdwr_pacing = counter_u64_alloc(M_WAITOK); 1814 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1815 SYSCTL_CHILDREN(bbr_sysctl_root), 1816 OID_AUTO, "hdwr_pacing", CTLFLAG_RD, 1817 &bbr_flows_whdwr_pacing, 1818 "Total number of hardware paced flows"); 1819 bbr_flows_nohdwr_pacing = counter_u64_alloc(M_WAITOK); 1820 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1821 SYSCTL_CHILDREN(bbr_sysctl_root), 1822 OID_AUTO, "software_pacing", CTLFLAG_RD, 1823 &bbr_flows_nohdwr_pacing, 1824 "Total number of software paced flows"); 1825 COUNTER_ARRAY_ALLOC(bbr_stat_arry, BBR_STAT_SIZE, M_WAITOK); 1826 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1827 OID_AUTO, "stats", CTLFLAG_RD, 1828 bbr_stat_arry, BBR_STAT_SIZE, "BBR Stats"); 1829 COUNTER_ARRAY_ALLOC(bbr_opts_arry, BBR_OPTS_SIZE, M_WAITOK); 1830 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1831 OID_AUTO, "opts", CTLFLAG_RD, 1832 bbr_opts_arry, BBR_OPTS_SIZE, "BBR Option Stats"); 1833 COUNTER_ARRAY_ALLOC(bbr_state_lost, BBR_MAX_STAT, M_WAITOK); 1834 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1835 OID_AUTO, "lost", CTLFLAG_RD, 1836 bbr_state_lost, BBR_MAX_STAT, "Stats of when losses occur"); 1837 COUNTER_ARRAY_ALLOC(bbr_state_resend, BBR_MAX_STAT, M_WAITOK); 1838 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1839 OID_AUTO, "stateresend", CTLFLAG_RD, 1840 bbr_state_resend, BBR_MAX_STAT, "Stats of what states resend"); 1841 COUNTER_ARRAY_ALLOC(bbr_state_time, BBR_MAX_STAT, M_WAITOK); 1842 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1843 OID_AUTO, "statetime", CTLFLAG_RD, 1844 bbr_state_time, BBR_MAX_STAT, "Stats of time spent in the states"); 1845 COUNTER_ARRAY_ALLOC(bbr_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK); 1846 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1847 OID_AUTO, "outsize", CTLFLAG_RD, 1848 bbr_out_size, TCP_MSS_ACCT_SIZE, "Size of output calls"); 1849 SYSCTL_ADD_PROC(&bbr_sysctl_ctx, 1850 SYSCTL_CHILDREN(bbr_sysctl_root), 1851 OID_AUTO, "clrlost", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, 1852 &bbr_clear_lost, 0, sysctl_bbr_clear_lost, "IU", "Clear lost counters"); 1853 } 1854 1855 static inline int32_t 1856 bbr_progress_timeout_check(struct tcp_bbr *bbr) 1857 { 1858 if (bbr->rc_tp->t_maxunacktime && bbr->rc_tp->t_acktime && 1859 TSTMP_GT(ticks, bbr->rc_tp->t_acktime)) { 1860 if ((((uint32_t)ticks - bbr->rc_tp->t_acktime)) >= bbr->rc_tp->t_maxunacktime) { 1861 /* 1862 * There is an assumption here that the caller will 1863 * drop the connection, so we increment the 1864 * statistics. 1865 */ 1866 bbr_log_progress_event(bbr, bbr->rc_tp, ticks, PROGRESS_DROP, __LINE__); 1867 BBR_STAT_INC(bbr_progress_drops); 1868 #ifdef NETFLIX_STATS 1869 TCPSTAT_INC(tcps_progdrops); 1870 #endif 1871 return (1); 1872 } 1873 } 1874 return (0); 1875 } 1876 1877 static void 1878 bbr_counter_destroy(void) 1879 { 1880 COUNTER_ARRAY_FREE(bbr_stat_arry, BBR_STAT_SIZE); 1881 COUNTER_ARRAY_FREE(bbr_opts_arry, BBR_OPTS_SIZE); 1882 COUNTER_ARRAY_FREE(bbr_out_size, TCP_MSS_ACCT_SIZE); 1883 COUNTER_ARRAY_FREE(bbr_state_lost, BBR_MAX_STAT); 1884 COUNTER_ARRAY_FREE(bbr_state_time, BBR_MAX_STAT); 1885 COUNTER_ARRAY_FREE(bbr_state_resend, BBR_MAX_STAT); 1886 counter_u64_free(bbr_flows_whdwr_pacing); 1887 counter_u64_free(bbr_flows_nohdwr_pacing); 1888 1889 } 1890 1891 static __inline void 1892 bbr_fill_in_logging_data(struct tcp_bbr *bbr, struct tcp_log_bbr *l, uint32_t cts) 1893 { 1894 memset(l, 0, sizeof(union tcp_log_stackspecific)); 1895 l->cur_del_rate = bbr->r_ctl.rc_bbr_cur_del_rate; 1896 l->delRate = get_filter_value(&bbr->r_ctl.rc_delrate); 1897 l->rttProp = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 1898 l->bw_inuse = bbr_get_bw(bbr); 1899 l->inflight = ctf_flight_size(bbr->rc_tp, 1900 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 1901 l->applimited = bbr->r_ctl.r_app_limited_until; 1902 l->delivered = bbr->r_ctl.rc_delivered; 1903 l->timeStamp = cts; 1904 l->lost = bbr->r_ctl.rc_lost; 1905 l->bbr_state = bbr->rc_bbr_state; 1906 l->bbr_substate = bbr_state_val(bbr); 1907 l->epoch = bbr->r_ctl.rc_rtt_epoch; 1908 l->lt_epoch = bbr->r_ctl.rc_lt_epoch; 1909 l->pacing_gain = bbr->r_ctl.rc_bbr_hptsi_gain; 1910 l->cwnd_gain = bbr->r_ctl.rc_bbr_cwnd_gain; 1911 l->inhpts = bbr->rc_inp->inp_in_hpts; 1912 l->ininput = bbr->rc_inp->inp_in_input; 1913 l->use_lt_bw = bbr->rc_lt_use_bw; 1914 l->pkts_out = bbr->r_ctl.rc_flight_at_input; 1915 l->pkt_epoch = bbr->r_ctl.rc_pkt_epoch; 1916 } 1917 1918 static void 1919 bbr_log_type_bw_reduce(struct tcp_bbr *bbr, int reason) 1920 { 1921 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1922 union tcp_log_stackspecific log; 1923 1924 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1925 log.u_bbr.flex1 = 0; 1926 log.u_bbr.flex2 = 0; 1927 log.u_bbr.flex5 = 0; 1928 log.u_bbr.flex3 = 0; 1929 log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_loss_rate; 1930 log.u_bbr.flex7 = reason; 1931 log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_enters_probertt; 1932 log.u_bbr.flex8 = 0; 1933 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1934 &bbr->rc_inp->inp_socket->so_rcv, 1935 &bbr->rc_inp->inp_socket->so_snd, 1936 BBR_LOG_BW_RED_EV, 0, 1937 0, &log, false, &bbr->rc_tv); 1938 } 1939 } 1940 1941 static void 1942 bbr_log_type_rwnd_collapse(struct tcp_bbr *bbr, int seq, int mode, uint32_t count) 1943 { 1944 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1945 union tcp_log_stackspecific log; 1946 1947 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1948 log.u_bbr.flex1 = seq; 1949 log.u_bbr.flex2 = count; 1950 log.u_bbr.flex8 = mode; 1951 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1952 &bbr->rc_inp->inp_socket->so_rcv, 1953 &bbr->rc_inp->inp_socket->so_snd, 1954 BBR_LOG_LOWGAIN, 0, 1955 0, &log, false, &bbr->rc_tv); 1956 } 1957 } 1958 1959 1960 1961 static void 1962 bbr_log_type_just_return(struct tcp_bbr *bbr, uint32_t cts, uint32_t tlen, uint8_t hpts_calling, 1963 uint8_t reason, uint32_t p_maxseg, int len) 1964 { 1965 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1966 union tcp_log_stackspecific log; 1967 1968 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 1969 log.u_bbr.flex1 = p_maxseg; 1970 log.u_bbr.flex2 = bbr->r_ctl.rc_hpts_flags; 1971 log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; 1972 log.u_bbr.flex4 = reason; 1973 log.u_bbr.flex5 = bbr->rc_in_persist; 1974 log.u_bbr.flex6 = bbr->r_ctl.rc_last_delay_val; 1975 log.u_bbr.flex7 = p_maxseg; 1976 log.u_bbr.flex8 = bbr->rc_in_persist; 1977 log.u_bbr.pkts_out = 0; 1978 log.u_bbr.applimited = len; 1979 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1980 &bbr->rc_inp->inp_socket->so_rcv, 1981 &bbr->rc_inp->inp_socket->so_snd, 1982 BBR_LOG_JUSTRET, 0, 1983 tlen, &log, false, &bbr->rc_tv); 1984 } 1985 } 1986 1987 1988 static void 1989 bbr_log_type_enter_rec(struct tcp_bbr *bbr, uint32_t seq) 1990 { 1991 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1992 union tcp_log_stackspecific log; 1993 1994 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1995 log.u_bbr.flex1 = seq; 1996 log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; 1997 log.u_bbr.flex3 = bbr->r_ctl.rc_recovery_start; 1998 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1999 &bbr->rc_inp->inp_socket->so_rcv, 2000 &bbr->rc_inp->inp_socket->so_snd, 2001 BBR_LOG_ENTREC, 0, 2002 0, &log, false, &bbr->rc_tv); 2003 } 2004 } 2005 2006 static void 2007 bbr_log_msgsize_fail(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t len, uint32_t maxseg, uint32_t mtu, int32_t csum_flags, int32_t tso, uint32_t cts) 2008 { 2009 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 2010 union tcp_log_stackspecific log; 2011 2012 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2013 log.u_bbr.flex1 = tso; 2014 log.u_bbr.flex2 = maxseg; 2015 log.u_bbr.flex3 = mtu; 2016 log.u_bbr.flex4 = csum_flags; 2017 TCP_LOG_EVENTP(tp, NULL, 2018 &bbr->rc_inp->inp_socket->so_rcv, 2019 &bbr->rc_inp->inp_socket->so_snd, 2020 BBR_LOG_MSGSIZE, 0, 2021 0, &log, false, &bbr->rc_tv); 2022 } 2023 } 2024 2025 static void 2026 bbr_log_flowend(struct tcp_bbr *bbr) 2027 { 2028 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2029 union tcp_log_stackspecific log; 2030 struct sockbuf *r, *s; 2031 struct timeval tv; 2032 2033 if (bbr->rc_inp->inp_socket) { 2034 r = &bbr->rc_inp->inp_socket->so_rcv; 2035 s = &bbr->rc_inp->inp_socket->so_snd; 2036 } else { 2037 r = s = NULL; 2038 } 2039 bbr_fill_in_logging_data(bbr, &log.u_bbr, tcp_get_usecs(&tv)); 2040 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2041 r, s, 2042 TCP_LOG_FLOWEND, 0, 2043 0, &log, false, &tv); 2044 } 2045 } 2046 2047 static void 2048 bbr_log_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, 2049 uint32_t lost, uint32_t del) 2050 { 2051 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2052 union tcp_log_stackspecific log; 2053 2054 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2055 log.u_bbr.flex1 = lost; 2056 log.u_bbr.flex2 = del; 2057 log.u_bbr.flex3 = bbr->r_ctl.rc_bbr_lastbtlbw; 2058 log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_rtt; 2059 log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; 2060 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2061 log.u_bbr.flex7 = line; 2062 log.u_bbr.flex8 = 0; 2063 log.u_bbr.inflight = bbr->r_ctl.r_measurement_count; 2064 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2065 &bbr->rc_inp->inp_socket->so_rcv, 2066 &bbr->rc_inp->inp_socket->so_snd, 2067 BBR_LOG_PKT_EPOCH, 0, 2068 0, &log, false, &bbr->rc_tv); 2069 } 2070 } 2071 2072 static void 2073 bbr_log_time_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, uint32_t epoch_time) 2074 { 2075 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2076 union tcp_log_stackspecific log; 2077 2078 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2079 log.u_bbr.flex1 = bbr->r_ctl.rc_lost; 2080 log.u_bbr.flex2 = bbr->rc_inp->inp_socket->so_snd.sb_lowat; 2081 log.u_bbr.flex3 = bbr->rc_inp->inp_socket->so_snd.sb_hiwat; 2082 log.u_bbr.flex7 = line; 2083 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2084 &bbr->rc_inp->inp_socket->so_rcv, 2085 &bbr->rc_inp->inp_socket->so_snd, 2086 BBR_LOG_TIME_EPOCH, 0, 2087 0, &log, false, &bbr->rc_tv); 2088 } 2089 } 2090 2091 static void 2092 bbr_log_set_of_state_target(struct tcp_bbr *bbr, uint32_t new_tar, int line, int meth) 2093 { 2094 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2095 union tcp_log_stackspecific log; 2096 2097 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2098 log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; 2099 log.u_bbr.flex2 = new_tar; 2100 log.u_bbr.flex3 = line; 2101 log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; 2102 log.u_bbr.flex5 = bbr_quanta; 2103 log.u_bbr.flex6 = bbr->r_ctl.rc_pace_min_segs; 2104 log.u_bbr.flex7 = bbr->rc_last_options; 2105 log.u_bbr.flex8 = meth; 2106 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2107 &bbr->rc_inp->inp_socket->so_rcv, 2108 &bbr->rc_inp->inp_socket->so_snd, 2109 BBR_LOG_STATE_TARGET, 0, 2110 0, &log, false, &bbr->rc_tv); 2111 } 2112 2113 } 2114 2115 static void 2116 bbr_log_type_statechange(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2117 { 2118 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2119 union tcp_log_stackspecific log; 2120 2121 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2122 log.u_bbr.flex1 = line; 2123 log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; 2124 log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; 2125 if (bbr_state_is_pkt_epoch) 2126 log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); 2127 else 2128 log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PROP); 2129 log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; 2130 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2131 log.u_bbr.flex7 = (bbr->r_ctl.rc_target_at_state/1000); 2132 log.u_bbr.lt_epoch = bbr->r_ctl.rc_level_state_extra; 2133 log.u_bbr.pkts_out = bbr->r_ctl.rc_target_at_state; 2134 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2135 &bbr->rc_inp->inp_socket->so_rcv, 2136 &bbr->rc_inp->inp_socket->so_snd, 2137 BBR_LOG_STATE, 0, 2138 0, &log, false, &bbr->rc_tv); 2139 } 2140 } 2141 2142 static void 2143 bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, 2144 uint32_t rtt, uint32_t line, uint8_t reas, uint16_t cond) 2145 { 2146 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2147 union tcp_log_stackspecific log; 2148 2149 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2150 log.u_bbr.flex1 = line; 2151 log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; 2152 log.u_bbr.flex3 = bbr->r_ctl.last_in_probertt; 2153 log.u_bbr.flex4 = applied; 2154 log.u_bbr.flex5 = rtt; 2155 log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; 2156 log.u_bbr.flex7 = cond; 2157 log.u_bbr.flex8 = reas; 2158 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2159 &bbr->rc_inp->inp_socket->so_rcv, 2160 &bbr->rc_inp->inp_socket->so_snd, 2161 BBR_LOG_RTT_SHRINKS, 0, 2162 0, &log, false, &bbr->rc_tv); 2163 } 2164 } 2165 2166 static void 2167 bbr_log_type_exit_rec(struct tcp_bbr *bbr) 2168 { 2169 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2170 union tcp_log_stackspecific log; 2171 2172 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2173 log.u_bbr.flex1 = bbr->r_ctl.rc_recovery_start; 2174 log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; 2175 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2176 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2177 &bbr->rc_inp->inp_socket->so_rcv, 2178 &bbr->rc_inp->inp_socket->so_snd, 2179 BBR_LOG_EXITREC, 0, 2180 0, &log, false, &bbr->rc_tv); 2181 } 2182 } 2183 2184 static void 2185 bbr_log_type_cwndupd(struct tcp_bbr *bbr, uint32_t bytes_this_ack, uint32_t chg, 2186 uint32_t prev_acked, int32_t meth, uint32_t target, uint32_t th_ack, int32_t line) 2187 { 2188 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2189 union tcp_log_stackspecific log; 2190 2191 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2192 log.u_bbr.flex1 = line; 2193 log.u_bbr.flex2 = prev_acked; 2194 log.u_bbr.flex3 = bytes_this_ack; 2195 log.u_bbr.flex4 = chg; 2196 log.u_bbr.flex5 = th_ack; 2197 log.u_bbr.flex6 = target; 2198 log.u_bbr.flex8 = meth; 2199 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2200 &bbr->rc_inp->inp_socket->so_rcv, 2201 &bbr->rc_inp->inp_socket->so_snd, 2202 BBR_LOG_CWND, 0, 2203 0, &log, false, &bbr->rc_tv); 2204 } 2205 } 2206 2207 static void 2208 bbr_log_rtt_sample(struct tcp_bbr *bbr, uint32_t rtt, uint32_t tsin) 2209 { 2210 /* 2211 * Log the rtt sample we are applying to the srtt algorithm in 2212 * useconds. 2213 */ 2214 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2215 union tcp_log_stackspecific log; 2216 2217 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2218 log.u_bbr.flex1 = rtt; 2219 log.u_bbr.flex2 = bbr->r_ctl.rc_bbr_state_time; 2220 log.u_bbr.flex3 = bbr->r_ctl.rc_ack_hdwr_delay; 2221 log.u_bbr.flex4 = bbr->rc_tp->ts_offset; 2222 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2223 log.u_bbr.pkts_out = tcp_tv_to_mssectick(&bbr->rc_tv); 2224 log.u_bbr.flex6 = tsin; 2225 log.u_bbr.flex7 = 0; 2226 log.u_bbr.flex8 = bbr->rc_ack_was_delayed; 2227 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2228 &bbr->rc_inp->inp_socket->so_rcv, 2229 &bbr->rc_inp->inp_socket->so_snd, 2230 TCP_LOG_RTT, 0, 2231 0, &log, false, &bbr->rc_tv); 2232 } 2233 } 2234 2235 static void 2236 bbr_log_type_pesist(struct tcp_bbr *bbr, uint32_t cts, uint32_t time_in, int32_t line, uint8_t enter_exit) 2237 { 2238 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2239 union tcp_log_stackspecific log; 2240 2241 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2242 log.u_bbr.flex1 = time_in; 2243 log.u_bbr.flex2 = line; 2244 log.u_bbr.flex8 = enter_exit; 2245 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2246 &bbr->rc_inp->inp_socket->so_rcv, 2247 &bbr->rc_inp->inp_socket->so_snd, 2248 BBR_LOG_PERSIST, 0, 2249 0, &log, false, &bbr->rc_tv); 2250 } 2251 } 2252 static void 2253 bbr_log_ack_clear(struct tcp_bbr *bbr, uint32_t cts) 2254 { 2255 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2256 union tcp_log_stackspecific log; 2257 2258 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2259 log.u_bbr.flex1 = bbr->rc_tp->ts_recent_age; 2260 log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; 2261 log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; 2262 log.u_bbr.flex4 = bbr->r_ctl.rc_went_idle_time; 2263 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2264 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2265 &bbr->rc_inp->inp_socket->so_rcv, 2266 &bbr->rc_inp->inp_socket->so_snd, 2267 BBR_LOG_ACKCLEAR, 0, 2268 0, &log, false, &bbr->rc_tv); 2269 } 2270 } 2271 2272 static void 2273 bbr_log_ack_event(struct tcp_bbr *bbr, struct tcphdr *th, struct tcpopt *to, uint32_t tlen, 2274 uint16_t nsegs, uint32_t cts, int32_t nxt_pkt, struct mbuf *m) 2275 { 2276 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2277 union tcp_log_stackspecific log; 2278 struct timeval tv; 2279 2280 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2281 log.u_bbr.flex1 = nsegs; 2282 log.u_bbr.flex2 = bbr->r_ctl.rc_lost_bytes; 2283 if (m) { 2284 struct timespec ts; 2285 2286 log.u_bbr.flex3 = m->m_flags; 2287 if (m->m_flags & M_TSTMP) { 2288 mbuf_tstmp2timespec(m, &ts); 2289 tv.tv_sec = ts.tv_sec; 2290 tv.tv_usec = ts.tv_nsec / 1000; 2291 log.u_bbr.lt_epoch = tcp_tv_to_usectick(&tv); 2292 } else { 2293 log.u_bbr.lt_epoch = 0; 2294 } 2295 if (m->m_flags & M_TSTMP_LRO) { 2296 tv.tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000; 2297 tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000) / 1000; 2298 log.u_bbr.flex5 = tcp_tv_to_usectick(&tv); 2299 } else { 2300 /* No arrival timestamp */ 2301 log.u_bbr.flex5 = 0; 2302 } 2303 2304 log.u_bbr.pkts_out = tcp_get_usecs(&tv); 2305 } else { 2306 log.u_bbr.flex3 = 0; 2307 log.u_bbr.flex5 = 0; 2308 log.u_bbr.flex6 = 0; 2309 log.u_bbr.pkts_out = 0; 2310 } 2311 log.u_bbr.flex4 = bbr->r_ctl.rc_target_at_state; 2312 log.u_bbr.flex7 = bbr->r_wanted_output; 2313 log.u_bbr.flex8 = bbr->rc_in_persist; 2314 TCP_LOG_EVENTP(bbr->rc_tp, th, 2315 &bbr->rc_inp->inp_socket->so_rcv, 2316 &bbr->rc_inp->inp_socket->so_snd, 2317 TCP_LOG_IN, 0, 2318 tlen, &log, true, &bbr->rc_tv); 2319 } 2320 } 2321 2322 static void 2323 bbr_log_doseg_done(struct tcp_bbr *bbr, uint32_t cts, int32_t nxt_pkt, int32_t did_out) 2324 { 2325 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2326 union tcp_log_stackspecific log; 2327 2328 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2329 log.u_bbr.flex1 = did_out; 2330 log.u_bbr.flex2 = nxt_pkt; 2331 log.u_bbr.flex3 = bbr->r_ctl.rc_last_delay_val; 2332 log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; 2333 log.u_bbr.flex5 = bbr->r_ctl.rc_timer_exp; 2334 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_bytes; 2335 log.u_bbr.flex7 = bbr->r_wanted_output; 2336 log.u_bbr.flex8 = bbr->rc_in_persist; 2337 log.u_bbr.pkts_out = bbr->r_ctl.highest_hdwr_delay; 2338 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2339 &bbr->rc_inp->inp_socket->so_rcv, 2340 &bbr->rc_inp->inp_socket->so_snd, 2341 BBR_LOG_DOSEG_DONE, 0, 2342 0, &log, true, &bbr->rc_tv); 2343 } 2344 } 2345 2346 static void 2347 bbr_log_enobuf_jmp(struct tcp_bbr *bbr, uint32_t len, uint32_t cts, 2348 int32_t line, uint32_t o_len, uint32_t segcnt, uint32_t segsiz) 2349 { 2350 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2351 union tcp_log_stackspecific log; 2352 2353 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2354 log.u_bbr.flex1 = line; 2355 log.u_bbr.flex2 = o_len; 2356 log.u_bbr.flex3 = segcnt; 2357 log.u_bbr.flex4 = segsiz; 2358 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2359 &bbr->rc_inp->inp_socket->so_rcv, 2360 &bbr->rc_inp->inp_socket->so_snd, 2361 BBR_LOG_ENOBUF_JMP, ENOBUFS, 2362 len, &log, true, &bbr->rc_tv); 2363 } 2364 } 2365 2366 static void 2367 bbr_log_to_processing(struct tcp_bbr *bbr, uint32_t cts, int32_t ret, int32_t timers, uint8_t hpts_calling) 2368 { 2369 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2370 union tcp_log_stackspecific log; 2371 2372 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2373 log.u_bbr.flex1 = timers; 2374 log.u_bbr.flex2 = ret; 2375 log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; 2376 log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; 2377 log.u_bbr.flex5 = cts; 2378 log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; 2379 log.u_bbr.flex8 = hpts_calling; 2380 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2381 &bbr->rc_inp->inp_socket->so_rcv, 2382 &bbr->rc_inp->inp_socket->so_snd, 2383 BBR_LOG_TO_PROCESS, 0, 2384 0, &log, false, &bbr->rc_tv); 2385 } 2386 } 2387 2388 static void 2389 bbr_log_to_event(struct tcp_bbr *bbr, uint32_t cts, int32_t to_num) 2390 { 2391 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2392 union tcp_log_stackspecific log; 2393 uint64_t ar; 2394 2395 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2396 log.u_bbr.flex1 = bbr->bbr_timer_src; 2397 log.u_bbr.flex2 = 0; 2398 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2399 ar = (uint64_t)(bbr->r_ctl.rc_resend); 2400 ar >>= 32; 2401 ar &= 0x00000000ffffffff; 2402 log.u_bbr.flex4 = (uint32_t)ar; 2403 ar = (uint64_t)bbr->r_ctl.rc_resend; 2404 ar &= 0x00000000ffffffff; 2405 log.u_bbr.flex5 = (uint32_t)ar; 2406 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2407 log.u_bbr.flex8 = to_num; 2408 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2409 &bbr->rc_inp->inp_socket->so_rcv, 2410 &bbr->rc_inp->inp_socket->so_snd, 2411 BBR_LOG_RTO, 0, 2412 0, &log, false, &bbr->rc_tv); 2413 } 2414 } 2415 2416 static void 2417 bbr_log_startup_event(struct tcp_bbr *bbr, uint32_t cts, uint32_t flex1, uint32_t flex2, uint32_t flex3, uint8_t reason) 2418 { 2419 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2420 union tcp_log_stackspecific log; 2421 2422 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2423 log.u_bbr.flex1 = flex1; 2424 log.u_bbr.flex2 = flex2; 2425 log.u_bbr.flex3 = flex3; 2426 log.u_bbr.flex4 = 0; 2427 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2428 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2429 log.u_bbr.flex8 = reason; 2430 log.u_bbr.cur_del_rate = bbr->r_ctl.rc_bbr_lastbtlbw; 2431 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2432 &bbr->rc_inp->inp_socket->so_rcv, 2433 &bbr->rc_inp->inp_socket->so_snd, 2434 BBR_LOG_REDUCE, 0, 2435 0, &log, false, &bbr->rc_tv); 2436 } 2437 } 2438 2439 static void 2440 bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag) 2441 { 2442 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2443 union tcp_log_stackspecific log; 2444 2445 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2446 log.u_bbr.flex1 = diag->p_nxt_slot; 2447 log.u_bbr.flex2 = diag->p_cur_slot; 2448 log.u_bbr.flex3 = diag->slot_req; 2449 log.u_bbr.flex4 = diag->inp_hptsslot; 2450 log.u_bbr.flex5 = diag->slot_remaining; 2451 log.u_bbr.flex6 = diag->need_new_to; 2452 log.u_bbr.flex7 = diag->p_hpts_active; 2453 log.u_bbr.flex8 = diag->p_on_min_sleep; 2454 /* Hijack other fields as needed */ 2455 log.u_bbr.epoch = diag->have_slept; 2456 log.u_bbr.lt_epoch = diag->yet_to_sleep; 2457 log.u_bbr.pkts_out = diag->co_ret; 2458 log.u_bbr.applimited = diag->hpts_sleep_time; 2459 log.u_bbr.delivered = diag->p_prev_slot; 2460 log.u_bbr.inflight = diag->p_runningtick; 2461 log.u_bbr.bw_inuse = diag->wheel_tick; 2462 log.u_bbr.rttProp = diag->wheel_cts; 2463 log.u_bbr.delRate = diag->maxticks; 2464 log.u_bbr.cur_del_rate = diag->p_curtick; 2465 log.u_bbr.cur_del_rate <<= 32; 2466 log.u_bbr.cur_del_rate |= diag->p_lasttick; 2467 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2468 &bbr->rc_inp->inp_socket->so_rcv, 2469 &bbr->rc_inp->inp_socket->so_snd, 2470 BBR_LOG_HPTSDIAG, 0, 2471 0, &log, false, &bbr->rc_tv); 2472 } 2473 } 2474 2475 static void 2476 bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, 2477 uint32_t thresh, uint32_t to) 2478 { 2479 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2480 union tcp_log_stackspecific log; 2481 2482 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2483 log.u_bbr.flex1 = bbr->rc_tp->t_rttvar; 2484 log.u_bbr.flex2 = time_since_sent; 2485 log.u_bbr.flex3 = srtt; 2486 log.u_bbr.flex4 = thresh; 2487 log.u_bbr.flex5 = to; 2488 log.u_bbr.flex6 = bbr->rc_tp->t_srtt; 2489 log.u_bbr.flex8 = mode; 2490 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2491 &bbr->rc_inp->inp_socket->so_rcv, 2492 &bbr->rc_inp->inp_socket->so_snd, 2493 BBR_LOG_TIMERPREP, 0, 2494 0, &log, false, &bbr->rc_tv); 2495 } 2496 } 2497 2498 static void 2499 bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, 2500 uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod) 2501 { 2502 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2503 union tcp_log_stackspecific log; 2504 2505 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2506 log.u_bbr.flex1 = usecs; 2507 log.u_bbr.flex2 = len; 2508 log.u_bbr.flex3 = (uint32_t)((bw >> 32) & 0x00000000ffffffff); 2509 log.u_bbr.flex4 = (uint32_t)(bw & 0x00000000ffffffff); 2510 if (override) 2511 log.u_bbr.flex5 = (1 << 2); 2512 else 2513 log.u_bbr.flex5 = 0; 2514 log.u_bbr.flex6 = override; 2515 log.u_bbr.flex7 = gain; 2516 log.u_bbr.flex8 = mod; 2517 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2518 &bbr->rc_inp->inp_socket->so_rcv, 2519 &bbr->rc_inp->inp_socket->so_snd, 2520 BBR_LOG_HPTSI_CALC, 0, 2521 len, &log, false, &bbr->rc_tv); 2522 } 2523 } 2524 2525 static void 2526 bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which) 2527 { 2528 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2529 union tcp_log_stackspecific log; 2530 2531 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2532 2533 log.u_bbr.flex1 = bbr->bbr_timer_src; 2534 log.u_bbr.flex2 = to; 2535 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2536 log.u_bbr.flex4 = slot; 2537 log.u_bbr.flex5 = bbr->rc_inp->inp_hptsslot; 2538 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2539 log.u_bbr.pkts_out = bbr->rc_inp->inp_flags2; 2540 log.u_bbr.flex8 = which; 2541 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2542 &bbr->rc_inp->inp_socket->so_rcv, 2543 &bbr->rc_inp->inp_socket->so_snd, 2544 BBR_LOG_TIMERSTAR, 0, 2545 0, &log, false, &bbr->rc_tv); 2546 } 2547 } 2548 2549 static void 2550 bbr_log_thresh_choice(struct tcp_bbr *bbr, uint32_t cts, uint32_t thresh, uint32_t lro, uint32_t srtt, struct bbr_sendmap *rsm, uint8_t frm) 2551 { 2552 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2553 union tcp_log_stackspecific log; 2554 2555 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2556 log.u_bbr.flex1 = thresh; 2557 log.u_bbr.flex2 = lro; 2558 log.u_bbr.flex3 = bbr->r_ctl.rc_reorder_ts; 2559 log.u_bbr.flex4 = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]; 2560 log.u_bbr.flex5 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2561 log.u_bbr.flex6 = srtt; 2562 log.u_bbr.flex7 = bbr->r_ctl.rc_reorder_shift; 2563 log.u_bbr.flex8 = frm; 2564 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2565 &bbr->rc_inp->inp_socket->so_rcv, 2566 &bbr->rc_inp->inp_socket->so_snd, 2567 BBR_LOG_THRESH_CALC, 0, 2568 0, &log, false, &bbr->rc_tv); 2569 } 2570 } 2571 2572 static void 2573 bbr_log_to_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts, uint8_t hpts_removed) 2574 { 2575 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2576 union tcp_log_stackspecific log; 2577 2578 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2579 log.u_bbr.flex1 = line; 2580 log.u_bbr.flex2 = bbr->bbr_timer_src; 2581 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2582 log.u_bbr.flex4 = bbr->rc_in_persist; 2583 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2584 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2585 log.u_bbr.flex8 = hpts_removed; 2586 log.u_bbr.pkts_out = bbr->rc_pacer_started; 2587 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2588 &bbr->rc_inp->inp_socket->so_rcv, 2589 &bbr->rc_inp->inp_socket->so_snd, 2590 BBR_LOG_TIMERCANC, 0, 2591 0, &log, false, &bbr->rc_tv); 2592 } 2593 } 2594 2595 2596 static void 2597 bbr_log_tstmp_validation(struct tcp_bbr *bbr, uint64_t peer_delta, uint64_t delta) 2598 { 2599 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2600 union tcp_log_stackspecific log; 2601 2602 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2603 log.u_bbr.flex1 = bbr->r_ctl.bbr_peer_tsratio; 2604 log.u_bbr.flex2 = (peer_delta >> 32); 2605 log.u_bbr.flex3 = (peer_delta & 0x00000000ffffffff); 2606 log.u_bbr.flex4 = (delta >> 32); 2607 log.u_bbr.flex5 = (delta & 0x00000000ffffffff); 2608 log.u_bbr.flex7 = bbr->rc_ts_clock_set; 2609 log.u_bbr.flex8 = bbr->rc_ts_cant_be_used; 2610 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2611 &bbr->rc_inp->inp_socket->so_rcv, 2612 &bbr->rc_inp->inp_socket->so_snd, 2613 BBR_LOG_TSTMP_VAL, 0, 2614 0, &log, false, &bbr->rc_tv); 2615 2616 } 2617 } 2618 2619 static void 2620 bbr_log_type_tsosize(struct tcp_bbr *bbr, uint32_t cts, uint32_t tsosz, uint32_t tls, uint32_t old_val, uint32_t maxseg, int hdwr) 2621 { 2622 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2623 union tcp_log_stackspecific log; 2624 2625 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2626 log.u_bbr.flex1 = tsosz; 2627 log.u_bbr.flex2 = tls; 2628 log.u_bbr.flex3 = tcp_min_hptsi_time; 2629 log.u_bbr.flex4 = bbr->r_ctl.bbr_hptsi_bytes_min; 2630 log.u_bbr.flex5 = old_val; 2631 log.u_bbr.flex6 = maxseg; 2632 log.u_bbr.flex7 = bbr->rc_no_pacing; 2633 log.u_bbr.flex7 <<= 1; 2634 log.u_bbr.flex7 |= bbr->rc_past_init_win; 2635 if (hdwr) 2636 log.u_bbr.flex8 = 0x80 | bbr->rc_use_google; 2637 else 2638 log.u_bbr.flex8 = bbr->rc_use_google; 2639 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2640 &bbr->rc_inp->inp_socket->so_rcv, 2641 &bbr->rc_inp->inp_socket->so_snd, 2642 BBR_LOG_BBRTSO, 0, 2643 0, &log, false, &bbr->rc_tv); 2644 } 2645 } 2646 2647 static void 2648 bbr_log_type_rsmclear(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, 2649 uint32_t flags, uint32_t line) 2650 { 2651 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2652 union tcp_log_stackspecific log; 2653 2654 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2655 log.u_bbr.flex1 = line; 2656 log.u_bbr.flex2 = rsm->r_start; 2657 log.u_bbr.flex3 = rsm->r_end; 2658 log.u_bbr.flex4 = rsm->r_delivered; 2659 log.u_bbr.flex5 = rsm->r_rtr_cnt; 2660 log.u_bbr.flex6 = rsm->r_dupack; 2661 log.u_bbr.flex7 = rsm->r_tim_lastsent[0]; 2662 log.u_bbr.flex8 = rsm->r_flags; 2663 /* Hijack the pkts_out fids */ 2664 log.u_bbr.applimited = flags; 2665 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2666 &bbr->rc_inp->inp_socket->so_rcv, 2667 &bbr->rc_inp->inp_socket->so_snd, 2668 BBR_RSM_CLEARED, 0, 2669 0, &log, false, &bbr->rc_tv); 2670 } 2671 } 2672 2673 static void 2674 bbr_log_type_bbrupd(struct tcp_bbr *bbr, uint8_t flex8, uint32_t cts, 2675 uint32_t flex3, uint32_t flex2, uint32_t flex5, 2676 uint32_t flex6, uint32_t pkts_out, int flex7, 2677 uint32_t flex4, uint32_t flex1) 2678 { 2679 2680 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2681 union tcp_log_stackspecific log; 2682 2683 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2684 log.u_bbr.flex1 = flex1; 2685 log.u_bbr.flex2 = flex2; 2686 log.u_bbr.flex3 = flex3; 2687 log.u_bbr.flex4 = flex4; 2688 log.u_bbr.flex5 = flex5; 2689 log.u_bbr.flex6 = flex6; 2690 log.u_bbr.flex7 = flex7; 2691 /* Hijack the pkts_out fids */ 2692 log.u_bbr.pkts_out = pkts_out; 2693 log.u_bbr.flex8 = flex8; 2694 if (bbr->rc_ack_was_delayed) 2695 log.u_bbr.epoch = bbr->r_ctl.rc_ack_hdwr_delay; 2696 else 2697 log.u_bbr.epoch = 0; 2698 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2699 &bbr->rc_inp->inp_socket->so_rcv, 2700 &bbr->rc_inp->inp_socket->so_snd, 2701 BBR_LOG_BBRUPD, 0, 2702 flex2, &log, false, &bbr->rc_tv); 2703 } 2704 } 2705 2706 2707 static void 2708 bbr_log_type_ltbw(struct tcp_bbr *bbr, uint32_t cts, int32_t reason, 2709 uint32_t newbw, uint32_t obw, uint32_t diff, 2710 uint32_t tim) 2711 { 2712 if (/*bbr_verbose_logging && */(bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2713 union tcp_log_stackspecific log; 2714 2715 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2716 log.u_bbr.flex1 = reason; 2717 log.u_bbr.flex2 = newbw; 2718 log.u_bbr.flex3 = obw; 2719 log.u_bbr.flex4 = diff; 2720 log.u_bbr.flex5 = bbr->r_ctl.rc_lt_lost; 2721 log.u_bbr.flex6 = bbr->r_ctl.rc_lt_del; 2722 log.u_bbr.flex7 = bbr->rc_lt_is_sampling; 2723 log.u_bbr.pkts_out = tim; 2724 log.u_bbr.bw_inuse = bbr->r_ctl.rc_lt_bw; 2725 if (bbr->rc_lt_use_bw == 0) 2726 log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; 2727 else 2728 log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; 2729 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2730 &bbr->rc_inp->inp_socket->so_rcv, 2731 &bbr->rc_inp->inp_socket->so_snd, 2732 BBR_LOG_BWSAMP, 0, 2733 0, &log, false, &bbr->rc_tv); 2734 } 2735 } 2736 2737 static inline void 2738 bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line) 2739 { 2740 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2741 union tcp_log_stackspecific log; 2742 2743 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2744 log.u_bbr.flex1 = line; 2745 log.u_bbr.flex2 = tick; 2746 log.u_bbr.flex3 = tp->t_maxunacktime; 2747 log.u_bbr.flex4 = tp->t_acktime; 2748 log.u_bbr.flex8 = event; 2749 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2750 &bbr->rc_inp->inp_socket->so_rcv, 2751 &bbr->rc_inp->inp_socket->so_snd, 2752 BBR_LOG_PROGRESS, 0, 2753 0, &log, false, &bbr->rc_tv); 2754 } 2755 } 2756 2757 static void 2758 bbr_type_log_hdwr_pacing(struct tcp_bbr *bbr, const struct ifnet *ifp, 2759 uint64_t rate, uint64_t hw_rate, int line, uint32_t cts, 2760 int error) 2761 { 2762 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2763 union tcp_log_stackspecific log; 2764 2765 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2766 log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff); 2767 log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff); 2768 log.u_bbr.flex3 = (((uint64_t)ifp >> 32) & 0x00000000ffffffff); 2769 log.u_bbr.flex4 = ((uint64_t)ifp & 0x00000000ffffffff); 2770 log.u_bbr.bw_inuse = rate; 2771 log.u_bbr.flex5 = line; 2772 log.u_bbr.flex6 = error; 2773 log.u_bbr.flex8 = bbr->skip_gain; 2774 log.u_bbr.flex8 <<= 1; 2775 log.u_bbr.flex8 |= bbr->gain_is_limited; 2776 log.u_bbr.flex8 <<= 1; 2777 log.u_bbr.flex8 |= bbr->bbr_hdrw_pacing; 2778 log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; 2779 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2780 &bbr->rc_inp->inp_socket->so_rcv, 2781 &bbr->rc_inp->inp_socket->so_snd, 2782 BBR_LOG_HDWR_PACE, 0, 2783 0, &log, false, &bbr->rc_tv); 2784 } 2785 } 2786 2787 static void 2788 bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, uint32_t del_by, uint32_t cts, uint32_t line, uint32_t prev_delay) 2789 { 2790 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2791 union tcp_log_stackspecific log; 2792 2793 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2794 log.u_bbr.flex1 = slot; 2795 log.u_bbr.flex2 = del_by; 2796 log.u_bbr.flex3 = prev_delay; 2797 log.u_bbr.flex4 = line; 2798 log.u_bbr.flex5 = bbr->r_ctl.rc_last_delay_val; 2799 log.u_bbr.flex6 = bbr->r_ctl.rc_hptsi_agg_delay; 2800 log.u_bbr.flex7 = (0x0000ffff & bbr->r_ctl.rc_hpts_flags); 2801 log.u_bbr.flex8 = bbr->rc_in_persist; 2802 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2803 &bbr->rc_inp->inp_socket->so_rcv, 2804 &bbr->rc_inp->inp_socket->so_snd, 2805 BBR_LOG_BBRSND, 0, 2806 len, &log, false, &bbr->rc_tv); 2807 } 2808 } 2809 2810 static void 2811 bbr_log_type_bbrrttprop(struct tcp_bbr *bbr, uint32_t t, uint32_t end, uint32_t tsconv, uint32_t cts, int32_t match, uint32_t seq, uint8_t flags) 2812 { 2813 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2814 union tcp_log_stackspecific log; 2815 2816 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2817 log.u_bbr.flex1 = bbr->r_ctl.rc_delivered; 2818 log.u_bbr.flex2 = 0; 2819 log.u_bbr.flex3 = bbr->r_ctl.rc_lowest_rtt; 2820 log.u_bbr.flex4 = end; 2821 log.u_bbr.flex5 = seq; 2822 log.u_bbr.flex6 = t; 2823 log.u_bbr.flex7 = match; 2824 log.u_bbr.flex8 = flags; 2825 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2826 &bbr->rc_inp->inp_socket->so_rcv, 2827 &bbr->rc_inp->inp_socket->so_snd, 2828 BBR_LOG_BBRRTT, 0, 2829 0, &log, false, &bbr->rc_tv); 2830 } 2831 } 2832 2833 static void 2834 bbr_log_exit_gain(struct tcp_bbr *bbr, uint32_t cts, int32_t entry_method) 2835 { 2836 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2837 union tcp_log_stackspecific log; 2838 2839 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2840 log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; 2841 log.u_bbr.flex2 = (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 2842 log.u_bbr.flex3 = bbr->r_ctl.gain_epoch; 2843 log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; 2844 log.u_bbr.flex5 = bbr->r_ctl.rc_pace_min_segs; 2845 log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_state_atflight; 2846 log.u_bbr.flex7 = 0; 2847 log.u_bbr.flex8 = entry_method; 2848 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2849 &bbr->rc_inp->inp_socket->so_rcv, 2850 &bbr->rc_inp->inp_socket->so_snd, 2851 BBR_LOG_EXIT_GAIN, 0, 2852 0, &log, false, &bbr->rc_tv); 2853 } 2854 } 2855 2856 static void 2857 bbr_log_settings_change(struct tcp_bbr *bbr, int settings_desired) 2858 { 2859 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2860 union tcp_log_stackspecific log; 2861 2862 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2863 /* R-HU */ 2864 log.u_bbr.flex1 = 0; 2865 log.u_bbr.flex2 = 0; 2866 log.u_bbr.flex3 = 0; 2867 log.u_bbr.flex4 = 0; 2868 log.u_bbr.flex7 = 0; 2869 log.u_bbr.flex8 = settings_desired; 2870 2871 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2872 &bbr->rc_inp->inp_socket->so_rcv, 2873 &bbr->rc_inp->inp_socket->so_snd, 2874 BBR_LOG_SETTINGS_CHG, 0, 2875 0, &log, false, &bbr->rc_tv); 2876 } 2877 } 2878 2879 /* 2880 * Returns the bw from the our filter. 2881 */ 2882 static inline uint64_t 2883 bbr_get_full_bw(struct tcp_bbr *bbr) 2884 { 2885 uint64_t bw; 2886 2887 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 2888 2889 return (bw); 2890 } 2891 2892 static inline void 2893 bbr_set_pktepoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2894 { 2895 uint64_t calclr; 2896 uint32_t lost, del; 2897 2898 if (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_pktepoch) 2899 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lost_at_pktepoch; 2900 else 2901 lost = 0; 2902 del = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_pkt_epoch_del; 2903 if (lost == 0) { 2904 calclr = 0; 2905 } else if (del) { 2906 calclr = lost; 2907 calclr *= (uint64_t)1000; 2908 calclr /= (uint64_t)del; 2909 } else { 2910 /* Nothing delivered? 100.0% loss */ 2911 calclr = 1000; 2912 } 2913 bbr->r_ctl.rc_pkt_epoch_loss_rate = (uint32_t)calclr; 2914 if (IN_RECOVERY(bbr->rc_tp->t_flags)) 2915 bbr->r_ctl.recovery_lr += (uint32_t)calclr; 2916 bbr->r_ctl.rc_pkt_epoch++; 2917 if (bbr->rc_no_pacing && 2918 (bbr->r_ctl.rc_pkt_epoch >= bbr->no_pacing_until)) { 2919 bbr->rc_no_pacing = 0; 2920 tcp_bbr_tso_size_check(bbr, cts); 2921 } 2922 bbr->r_ctl.rc_pkt_epoch_rtt = bbr_calc_time(cts, bbr->r_ctl.rc_pkt_epoch_time); 2923 bbr->r_ctl.rc_pkt_epoch_time = cts; 2924 /* What was our loss rate */ 2925 bbr_log_pkt_epoch(bbr, cts, line, lost, del); 2926 bbr->r_ctl.rc_pkt_epoch_del = bbr->r_ctl.rc_delivered; 2927 bbr->r_ctl.rc_lost_at_pktepoch = bbr->r_ctl.rc_lost; 2928 } 2929 2930 static inline void 2931 bbr_set_epoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2932 { 2933 uint32_t epoch_time; 2934 2935 /* Tick the RTT clock */ 2936 bbr->r_ctl.rc_rtt_epoch++; 2937 epoch_time = cts - bbr->r_ctl.rc_rcv_epoch_start; 2938 bbr_log_time_epoch(bbr, cts, line, epoch_time); 2939 bbr->r_ctl.rc_rcv_epoch_start = cts; 2940 } 2941 2942 2943 static inline void 2944 bbr_isit_a_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, int32_t line, int32_t cum_acked) 2945 { 2946 if (SEQ_GEQ(rsm->r_delivered, bbr->r_ctl.rc_pkt_epoch_del)) { 2947 bbr->rc_is_pkt_epoch_now = 1; 2948 } 2949 } 2950 2951 /* 2952 * Returns the bw from either the b/w filter 2953 * or from the lt_bw (if the connection is being 2954 * policed). 2955 */ 2956 static inline uint64_t 2957 __bbr_get_bw(struct tcp_bbr *bbr) 2958 { 2959 uint64_t bw, min_bw; 2960 uint64_t rtt; 2961 int gm_measure_cnt = 1; 2962 2963 /* 2964 * For startup we make, like google, a 2965 * minimum b/w. This is generated from the 2966 * IW and the rttProp. We do fall back to srtt 2967 * if for some reason (initial handshake) we don't 2968 * have a rttProp. We, in the worst case, fall back 2969 * to the configured min_bw (rc_initial_hptsi_bw). 2970 */ 2971 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 2972 /* Attempt first to use rttProp */ 2973 rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); 2974 if (rtt && (rtt < 0xffffffff)) { 2975 measure: 2976 min_bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * 2977 ((uint64_t)1000000); 2978 min_bw /= rtt; 2979 if (min_bw < bbr->r_ctl.rc_initial_hptsi_bw) { 2980 min_bw = bbr->r_ctl.rc_initial_hptsi_bw; 2981 } 2982 2983 } else if (bbr->rc_tp->t_srtt != 0) { 2984 /* No rttProp, use srtt? */ 2985 rtt = bbr_get_rtt(bbr, BBR_SRTT); 2986 goto measure; 2987 } else { 2988 min_bw = bbr->r_ctl.rc_initial_hptsi_bw; 2989 } 2990 } else 2991 min_bw = 0; 2992 2993 if ((bbr->rc_past_init_win == 0) && 2994 (bbr->r_ctl.rc_delivered > bbr_initial_cwnd(bbr, bbr->rc_tp))) 2995 bbr->rc_past_init_win = 1; 2996 if ((bbr->rc_use_google) && (bbr->r_ctl.r_measurement_count >= 1)) 2997 gm_measure_cnt = 0; 2998 if (gm_measure_cnt && 2999 ((bbr->r_ctl.r_measurement_count < bbr_min_measurements_req) || 3000 (bbr->rc_past_init_win == 0))) { 3001 /* For google we use our guess rate until we get 1 measurement */ 3002 3003 use_initial_window: 3004 rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); 3005 if (rtt && (rtt < 0xffffffff)) { 3006 /* 3007 * We have an RTT measurment. Use that in 3008 * combination with our initial window to calculate 3009 * a b/w. 3010 */ 3011 bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * 3012 ((uint64_t)1000000); 3013 bw /= rtt; 3014 if (bw < bbr->r_ctl.rc_initial_hptsi_bw) { 3015 bw = bbr->r_ctl.rc_initial_hptsi_bw; 3016 } 3017 } else { 3018 /* Drop back to the 40 and punt to a default */ 3019 bw = bbr->r_ctl.rc_initial_hptsi_bw; 3020 } 3021 if (bw < 1) 3022 /* Probably should panic */ 3023 bw = 1; 3024 if (bw > min_bw) 3025 return (bw); 3026 else 3027 return (min_bw); 3028 } 3029 if (bbr->rc_lt_use_bw) 3030 bw = bbr->r_ctl.rc_lt_bw; 3031 else if (bbr->r_recovery_bw && (bbr->rc_use_google == 0)) 3032 bw = bbr->r_ctl.red_bw; 3033 else 3034 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3035 if (bbr->rc_tp->t_peakrate_thr && (bbr->rc_use_google == 0)) { 3036 /* 3037 * Enforce user set rate limit, keep in mind that 3038 * t_peakrate_thr is in B/s already 3039 */ 3040 bw = uqmin((uint64_t)bbr->rc_tp->t_peakrate_thr, bw); 3041 } 3042 if (bw == 0) { 3043 /* We should not be at 0, go to the initial window then */ 3044 goto use_initial_window; 3045 } 3046 if (bw < 1) 3047 /* Probably should panic */ 3048 bw = 1; 3049 if (bw < min_bw) 3050 bw = min_bw; 3051 return (bw); 3052 } 3053 3054 static inline uint64_t 3055 bbr_get_bw(struct tcp_bbr *bbr) 3056 { 3057 uint64_t bw; 3058 3059 bw = __bbr_get_bw(bbr); 3060 return (bw); 3061 } 3062 3063 static inline void 3064 bbr_reset_lt_bw_interval(struct tcp_bbr *bbr, uint32_t cts) 3065 { 3066 bbr->r_ctl.rc_lt_epoch = bbr->r_ctl.rc_pkt_epoch; 3067 bbr->r_ctl.rc_lt_time = bbr->r_ctl.rc_del_time; 3068 bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; 3069 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 3070 } 3071 3072 static inline void 3073 bbr_reset_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts) 3074 { 3075 bbr->rc_lt_is_sampling = 0; 3076 bbr->rc_lt_use_bw = 0; 3077 bbr->r_ctl.rc_lt_bw = 0; 3078 bbr_reset_lt_bw_interval(bbr, cts); 3079 } 3080 3081 static inline void 3082 bbr_lt_bw_samp_done(struct tcp_bbr *bbr, uint64_t bw, uint32_t cts, uint32_t timin) 3083 { 3084 uint64_t diff; 3085 3086 /* Do we have a previous sample? */ 3087 if (bbr->r_ctl.rc_lt_bw) { 3088 /* Get the diff in bytes per second */ 3089 if (bbr->r_ctl.rc_lt_bw > bw) 3090 diff = bbr->r_ctl.rc_lt_bw - bw; 3091 else 3092 diff = bw - bbr->r_ctl.rc_lt_bw; 3093 if ((diff <= bbr_lt_bw_diff) || 3094 (diff <= (bbr->r_ctl.rc_lt_bw / bbr_lt_bw_ratio))) { 3095 /* Consider us policed */ 3096 uint32_t saved_bw; 3097 3098 saved_bw = (uint32_t)bbr->r_ctl.rc_lt_bw; 3099 bbr->r_ctl.rc_lt_bw = (bw + bbr->r_ctl.rc_lt_bw) / 2; /* average of two */ 3100 bbr->rc_lt_use_bw = 1; 3101 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 3102 /* 3103 * Use pkt based epoch for measuring length of 3104 * policer up 3105 */ 3106 bbr->r_ctl.rc_lt_epoch_use = bbr->r_ctl.rc_pkt_epoch; 3107 /* 3108 * reason 4 is we need to start consider being 3109 * policed 3110 */ 3111 bbr_log_type_ltbw(bbr, cts, 4, (uint32_t)bw, saved_bw, (uint32_t)diff, timin); 3112 return; 3113 } 3114 } 3115 bbr->r_ctl.rc_lt_bw = bw; 3116 bbr_reset_lt_bw_interval(bbr, cts); 3117 bbr_log_type_ltbw(bbr, cts, 5, 0, (uint32_t)bw, 0, timin); 3118 } 3119 3120 /* 3121 * RRS: Copied from user space! 3122 * Calculate a uniformly distributed random number less than upper_bound 3123 * avoiding "modulo bias". 3124 * 3125 * Uniformity is achieved by generating new random numbers until the one 3126 * returned is outside the range [0, 2**32 % upper_bound). This 3127 * guarantees the selected random number will be inside 3128 * [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound) 3129 * after reduction modulo upper_bound. 3130 */ 3131 static uint32_t 3132 arc4random_uniform(uint32_t upper_bound) 3133 { 3134 uint32_t r, min; 3135 3136 if (upper_bound < 2) 3137 return 0; 3138 3139 /* 2**32 % x == (2**32 - x) % x */ 3140 min = -upper_bound % upper_bound; 3141 3142 /* 3143 * This could theoretically loop forever but each retry has 3144 * p > 0.5 (worst case, usually far better) of selecting a 3145 * number inside the range we need, so it should rarely need 3146 * to re-roll. 3147 */ 3148 for (;;) { 3149 r = arc4random(); 3150 if (r >= min) 3151 break; 3152 } 3153 3154 return r % upper_bound; 3155 } 3156 3157 static void 3158 bbr_randomize_extra_state_time(struct tcp_bbr *bbr) 3159 { 3160 uint32_t ran, deduct; 3161 3162 ran = arc4random_uniform(bbr_rand_ot); 3163 if (ran) { 3164 deduct = bbr->r_ctl.rc_level_state_extra / ran; 3165 bbr->r_ctl.rc_level_state_extra -= deduct; 3166 } 3167 } 3168 /* 3169 * Return randomly the starting state 3170 * to use in probebw. 3171 */ 3172 static uint8_t 3173 bbr_pick_probebw_substate(struct tcp_bbr *bbr, uint32_t cts) 3174 { 3175 uint32_t ran; 3176 uint8_t ret_val; 3177 3178 /* Initialize the offset to 0 */ 3179 bbr->r_ctl.rc_exta_time_gd = 0; 3180 bbr->rc_hit_state_1 = 0; 3181 bbr->r_ctl.rc_level_state_extra = 0; 3182 ran = arc4random_uniform((BBR_SUBSTATE_COUNT-1)); 3183 /* 3184 * The math works funny here :) the return value is used to set the 3185 * substate and then the state change is called which increments by 3186 * one. So if we return 1 (DRAIN) we will increment to 2 (LEVEL1) when 3187 * we fully enter the state. Note that the (8 - 1 - ran) assures that 3188 * we return 1 - 7, so we dont return 0 and end up starting in 3189 * state 1 (DRAIN). 3190 */ 3191 ret_val = BBR_SUBSTATE_COUNT - 1 - ran; 3192 /* Set an epoch */ 3193 if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) 3194 bbr_set_epoch(bbr, cts, __LINE__); 3195 3196 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 3197 return (ret_val); 3198 } 3199 3200 static void 3201 bbr_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts, int32_t loss_detected) 3202 { 3203 uint32_t diff, d_time; 3204 uint64_t del_time, bw, lost, delivered; 3205 3206 if (bbr->r_use_policer == 0) 3207 return; 3208 if (bbr->rc_lt_use_bw) { 3209 /* We are using lt bw do we stop yet? */ 3210 diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; 3211 if (diff > bbr_lt_bw_max_rtts) { 3212 /* Reset it all */ 3213 reset_all: 3214 bbr_reset_lt_bw_sampling(bbr, cts); 3215 if (bbr->rc_filled_pipe) { 3216 bbr_set_epoch(bbr, cts, __LINE__); 3217 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 3218 bbr_substate_change(bbr, cts, __LINE__, 0); 3219 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 3220 bbr_log_type_statechange(bbr, cts, __LINE__); 3221 } else { 3222 /* 3223 * This should not happen really 3224 * unless we remove the startup/drain 3225 * restrictions above. 3226 */ 3227 bbr->rc_bbr_state = BBR_STATE_STARTUP; 3228 bbr_set_epoch(bbr, cts, __LINE__); 3229 bbr->r_ctl.rc_bbr_state_time = cts; 3230 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 3231 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 3232 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 3233 bbr_set_state_target(bbr, __LINE__); 3234 bbr_log_type_statechange(bbr, cts, __LINE__); 3235 } 3236 /* reason 0 is to stop using lt-bw */ 3237 bbr_log_type_ltbw(bbr, cts, 0, 0, 0, 0, 0); 3238 return; 3239 } 3240 if (bbr_lt_intvl_fp == 0) { 3241 /* Not doing false-postive detection */ 3242 return; 3243 } 3244 /* False positive detection */ 3245 if (diff == bbr_lt_intvl_fp) { 3246 /* At bbr_lt_intvl_fp we record the lost */ 3247 bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; 3248 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 3249 } else if (diff > (bbr_lt_intvl_min_rtts + bbr_lt_intvl_fp)) { 3250 /* Now is our loss rate still high? */ 3251 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; 3252 delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; 3253 if ((delivered == 0) || 3254 (((lost * 1000)/delivered) < bbr_lt_fd_thresh)) { 3255 /* No still below our threshold */ 3256 bbr_log_type_ltbw(bbr, cts, 7, lost, delivered, 0, 0); 3257 } else { 3258 /* Yikes its still high, it must be a false positive */ 3259 bbr_log_type_ltbw(bbr, cts, 8, lost, delivered, 0, 0); 3260 goto reset_all; 3261 } 3262 } 3263 return; 3264 } 3265 /* 3266 * Wait for the first loss before sampling, to let the policer 3267 * exhaust its tokens and estimate the steady-state rate allowed by 3268 * the policer. Starting samples earlier includes bursts that 3269 * over-estimate the bw. 3270 */ 3271 if (bbr->rc_lt_is_sampling == 0) { 3272 /* reason 1 is to begin doing the sampling */ 3273 if (loss_detected == 0) 3274 return; 3275 bbr_reset_lt_bw_interval(bbr, cts); 3276 bbr->rc_lt_is_sampling = 1; 3277 bbr_log_type_ltbw(bbr, cts, 1, 0, 0, 0, 0); 3278 return; 3279 } 3280 /* Now how long were we delivering long term last> */ 3281 if (TSTMP_GEQ(bbr->r_ctl.rc_del_time, bbr->r_ctl.rc_lt_time)) 3282 d_time = bbr->r_ctl.rc_del_time - bbr->r_ctl.rc_lt_time; 3283 else 3284 d_time = 0; 3285 3286 /* To avoid underestimates, reset sampling if we run out of data. */ 3287 if (bbr->r_ctl.r_app_limited_until) { 3288 /* Can not measure in app-limited state */ 3289 bbr_reset_lt_bw_sampling(bbr, cts); 3290 /* reason 2 is to reset sampling due to app limits */ 3291 bbr_log_type_ltbw(bbr, cts, 2, 0, 0, 0, d_time); 3292 return; 3293 } 3294 diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; 3295 if (diff < bbr_lt_intvl_min_rtts) { 3296 /* 3297 * need more samples (we don't 3298 * start on a round like linux so 3299 * we need 1 more). 3300 */ 3301 /* 6 is not_enough time or no-loss */ 3302 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3303 return; 3304 } 3305 if (diff > (4 * bbr_lt_intvl_min_rtts)) { 3306 /* 3307 * For now if we wait too long, reset all sampling. We need 3308 * to do some research here, its possible that we should 3309 * base this on how much loss as occurred.. something like 3310 * if its under 10% (or some thresh) reset all otherwise 3311 * don't. Thats for phase II I guess. 3312 */ 3313 bbr_reset_lt_bw_sampling(bbr, cts); 3314 /* reason 3 is to reset sampling due too long of sampling */ 3315 bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); 3316 return; 3317 } 3318 /* 3319 * End sampling interval when a packet is lost, so we estimate the 3320 * policer tokens were exhausted. Stopping the sampling before the 3321 * tokens are exhausted under-estimates the policed rate. 3322 */ 3323 if (loss_detected == 0) { 3324 /* 6 is not_enough time or no-loss */ 3325 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3326 return; 3327 } 3328 /* Calculate packets lost and delivered in sampling interval. */ 3329 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; 3330 delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; 3331 if ((delivered == 0) || 3332 (((lost * 1000)/delivered) < bbr_lt_loss_thresh)) { 3333 bbr_log_type_ltbw(bbr, cts, 6, lost, delivered, 0, d_time); 3334 return; 3335 } 3336 if (d_time < 1000) { 3337 /* Not enough time. wait */ 3338 /* 6 is not_enough time or no-loss */ 3339 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3340 return; 3341 } 3342 if (d_time >= (0xffffffff / USECS_IN_MSEC)) { 3343 /* Too long */ 3344 bbr_reset_lt_bw_sampling(bbr, cts); 3345 /* reason 3 is to reset sampling due too long of sampling */ 3346 bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); 3347 return; 3348 } 3349 del_time = d_time; 3350 bw = delivered; 3351 bw *= (uint64_t)USECS_IN_SECOND; 3352 bw /= del_time; 3353 bbr_lt_bw_samp_done(bbr, bw, cts, d_time); 3354 } 3355 3356 /* 3357 * Allocate a sendmap from our zone. 3358 */ 3359 static struct bbr_sendmap * 3360 bbr_alloc(struct tcp_bbr *bbr) 3361 { 3362 struct bbr_sendmap *rsm; 3363 3364 BBR_STAT_INC(bbr_to_alloc); 3365 rsm = uma_zalloc(bbr_zone, (M_NOWAIT | M_ZERO)); 3366 if (rsm) { 3367 bbr->r_ctl.rc_num_maps_alloced++; 3368 return (rsm); 3369 } 3370 if (bbr->r_ctl.rc_free_cnt) { 3371 BBR_STAT_INC(bbr_to_alloc_emerg); 3372 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 3373 TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); 3374 bbr->r_ctl.rc_free_cnt--; 3375 return (rsm); 3376 } 3377 BBR_STAT_INC(bbr_to_alloc_failed); 3378 return (NULL); 3379 } 3380 3381 static struct bbr_sendmap * 3382 bbr_alloc_full_limit(struct tcp_bbr *bbr) 3383 { 3384 if ((V_tcp_map_entries_limit > 0) && 3385 (bbr->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) { 3386 BBR_STAT_INC(bbr_alloc_limited); 3387 if (!bbr->alloc_limit_reported) { 3388 bbr->alloc_limit_reported = 1; 3389 BBR_STAT_INC(bbr_alloc_limited_conns); 3390 } 3391 return (NULL); 3392 } 3393 return (bbr_alloc(bbr)); 3394 } 3395 3396 3397 /* wrapper to allocate a sendmap entry, subject to a specific limit */ 3398 static struct bbr_sendmap * 3399 bbr_alloc_limit(struct tcp_bbr *bbr, uint8_t limit_type) 3400 { 3401 struct bbr_sendmap *rsm; 3402 3403 if (limit_type) { 3404 /* currently there is only one limit type */ 3405 if (V_tcp_map_split_limit > 0 && 3406 bbr->r_ctl.rc_num_split_allocs >= V_tcp_map_split_limit) { 3407 BBR_STAT_INC(bbr_split_limited); 3408 if (!bbr->alloc_limit_reported) { 3409 bbr->alloc_limit_reported = 1; 3410 BBR_STAT_INC(bbr_alloc_limited_conns); 3411 } 3412 return (NULL); 3413 } 3414 } 3415 3416 /* allocate and mark in the limit type, if set */ 3417 rsm = bbr_alloc(bbr); 3418 if (rsm != NULL && limit_type) { 3419 rsm->r_limit_type = limit_type; 3420 bbr->r_ctl.rc_num_split_allocs++; 3421 } 3422 return (rsm); 3423 } 3424 3425 static void 3426 bbr_free(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 3427 { 3428 if (rsm->r_limit_type) { 3429 /* currently there is only one limit type */ 3430 bbr->r_ctl.rc_num_split_allocs--; 3431 } 3432 if (rsm->r_is_smallmap) 3433 bbr->r_ctl.rc_num_small_maps_alloced--; 3434 if (bbr->r_ctl.rc_tlp_send == rsm) 3435 bbr->r_ctl.rc_tlp_send = NULL; 3436 if (bbr->r_ctl.rc_resend == rsm) { 3437 bbr->r_ctl.rc_resend = NULL; 3438 } 3439 if (bbr->r_ctl.rc_next == rsm) 3440 bbr->r_ctl.rc_next = NULL; 3441 if (bbr->r_ctl.rc_sacklast == rsm) 3442 bbr->r_ctl.rc_sacklast = NULL; 3443 if (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { 3444 memset(rsm, 0, sizeof(struct bbr_sendmap)); 3445 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); 3446 rsm->r_limit_type = 0; 3447 bbr->r_ctl.rc_free_cnt++; 3448 return; 3449 } 3450 bbr->r_ctl.rc_num_maps_alloced--; 3451 uma_zfree(bbr_zone, rsm); 3452 } 3453 3454 /* 3455 * Returns the BDP. 3456 */ 3457 static uint64_t 3458 bbr_get_bw_delay_prod(uint64_t rtt, uint64_t bw) { 3459 /* 3460 * Calculate the bytes in flight needed given the bw (in bytes per 3461 * second) and the specifyed rtt in useconds. We need to put out the 3462 * returned value per RTT to match that rate. Gain will normaly 3463 * raise it up from there. 3464 * 3465 * This should not overflow as long as the bandwidth is below 1 3466 * TByte per second (bw < 10**12 = 2**40) and the rtt is smaller 3467 * than 1000 seconds (rtt < 10**3 * 10**6 = 10**9 = 2**30). 3468 */ 3469 uint64_t usec_per_sec; 3470 3471 usec_per_sec = USECS_IN_SECOND; 3472 return ((rtt * bw) / usec_per_sec); 3473 } 3474 3475 /* 3476 * Return the initial cwnd. 3477 */ 3478 static uint32_t 3479 bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp) 3480 { 3481 uint32_t i_cwnd; 3482 3483 if (bbr->rc_init_win) { 3484 i_cwnd = bbr->rc_init_win * tp->t_maxseg; 3485 } else if (V_tcp_initcwnd_segments) 3486 i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg), 3487 max(2 * tp->t_maxseg, 14600)); 3488 else if (V_tcp_do_rfc3390) 3489 i_cwnd = min(4 * tp->t_maxseg, 3490 max(2 * tp->t_maxseg, 4380)); 3491 else { 3492 /* Per RFC5681 Section 3.1 */ 3493 if (tp->t_maxseg > 2190) 3494 i_cwnd = 2 * tp->t_maxseg; 3495 else if (tp->t_maxseg > 1095) 3496 i_cwnd = 3 * tp->t_maxseg; 3497 else 3498 i_cwnd = 4 * tp->t_maxseg; 3499 } 3500 return (i_cwnd); 3501 } 3502 3503 /* 3504 * Given a specified gain, return the target 3505 * cwnd based on that gain. 3506 */ 3507 static uint32_t 3508 bbr_get_raw_target_cwnd(struct tcp_bbr *bbr, uint32_t gain, uint64_t bw) 3509 { 3510 uint64_t bdp, rtt; 3511 uint32_t cwnd; 3512 3513 if ((get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) || 3514 (bbr_get_full_bw(bbr) == 0)) { 3515 /* No measurements yet */ 3516 return (bbr_initial_cwnd(bbr, bbr->rc_tp)); 3517 } 3518 /* 3519 * Get bytes per RTT needed (rttProp is normally in 3520 * bbr_cwndtarget_rtt_touse) 3521 */ 3522 rtt = bbr_get_rtt(bbr, bbr_cwndtarget_rtt_touse); 3523 /* Get the bdp from the two values */ 3524 bdp = bbr_get_bw_delay_prod(rtt, bw); 3525 /* Now apply the gain */ 3526 cwnd = (uint32_t)(((bdp * ((uint64_t)gain)) + (uint64_t)(BBR_UNIT - 1)) / ((uint64_t)BBR_UNIT)); 3527 3528 return (cwnd); 3529 } 3530 3531 static uint32_t 3532 bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain) 3533 { 3534 uint32_t cwnd, mss; 3535 3536 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 3537 /* Get the base cwnd with gain rounded to a mss */ 3538 cwnd = roundup(bbr_get_raw_target_cwnd(bbr, bw, gain), mss); 3539 /* 3540 * Add in N (2 default since we do not have a 3541 * fq layer to trap packets in) quanta's per the I-D 3542 * section 4.2.3.2 quanta adjust. 3543 */ 3544 cwnd += (bbr_quanta * bbr->r_ctl.rc_pace_max_segs); 3545 if (bbr->rc_use_google) { 3546 if((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 3547 (bbr_state_val(bbr) == BBR_SUB_GAIN)) { 3548 /* 3549 * The linux implementation adds 3550 * an extra 2 x mss in gain cycle which 3551 * is documented no-where except in the code. 3552 * so we add more for Neal undocumented feature 3553 */ 3554 cwnd += 2 * mss; 3555 } 3556 if ((cwnd / mss) & 0x1) { 3557 /* Round up for odd num mss */ 3558 cwnd += mss; 3559 } 3560 } 3561 /* Are we below the min cwnd? */ 3562 if (cwnd < get_min_cwnd(bbr)) 3563 return (get_min_cwnd(bbr)); 3564 return (cwnd); 3565 } 3566 3567 static uint16_t 3568 bbr_gain_adjust(struct tcp_bbr *bbr, uint16_t gain) 3569 { 3570 if (gain < 1) 3571 gain = 1; 3572 return (gain); 3573 } 3574 3575 static uint32_t 3576 bbr_get_header_oh(struct tcp_bbr *bbr) 3577 { 3578 int seg_oh; 3579 3580 seg_oh = 0; 3581 if (bbr->r_ctl.rc_inc_tcp_oh) { 3582 /* Do we include TCP overhead? */ 3583 seg_oh = (bbr->rc_last_options + sizeof(struct tcphdr)); 3584 } 3585 if (bbr->r_ctl.rc_inc_ip_oh) { 3586 /* Do we include IP overhead? */ 3587 #ifdef INET6 3588 if (bbr->r_is_v6) 3589 seg_oh += sizeof(struct ip6_hdr); 3590 else 3591 #endif 3592 #ifdef INET 3593 seg_oh += sizeof(struct ip); 3594 #endif 3595 } 3596 if (bbr->r_ctl.rc_inc_enet_oh) { 3597 /* Do we include the ethernet overhead? */ 3598 seg_oh += sizeof(struct ether_header); 3599 } 3600 return(seg_oh); 3601 } 3602 3603 3604 static uint32_t 3605 bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, uint32_t useconds_time, uint64_t bw) 3606 { 3607 uint64_t divor, res, tim; 3608 3609 if (useconds_time == 0) 3610 return (0); 3611 gain = bbr_gain_adjust(bbr, gain); 3612 divor = (uint64_t)USECS_IN_SECOND * (uint64_t)BBR_UNIT; 3613 tim = useconds_time; 3614 res = (tim * bw * gain) / divor; 3615 if (res == 0) 3616 res = 1; 3617 return ((uint32_t)res); 3618 } 3619 3620 /* 3621 * Given a gain and a length return the delay in useconds that 3622 * should be used to evenly space out packets 3623 * on the connection (based on the gain factor). 3624 */ 3625 static uint32_t 3626 bbr_get_pacing_delay(struct tcp_bbr *bbr, uint16_t gain, int32_t len, uint32_t cts, int nolog) 3627 { 3628 uint64_t bw, lentim, res; 3629 uint32_t usecs, srtt, over = 0; 3630 uint32_t seg_oh, num_segs, maxseg; 3631 3632 if (len == 0) 3633 return (0); 3634 3635 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 3636 num_segs = (len + maxseg - 1) / maxseg; 3637 if (bbr->rc_use_google == 0) { 3638 seg_oh = bbr_get_header_oh(bbr); 3639 len += (num_segs * seg_oh); 3640 } 3641 gain = bbr_gain_adjust(bbr, gain); 3642 bw = bbr_get_bw(bbr); 3643 if (bbr->rc_use_google) { 3644 uint64_t cbw; 3645 3646 /* 3647 * Reduce the b/w by the google discount 3648 * factor 10 = 1%. 3649 */ 3650 cbw = bw * (uint64_t)(1000 - bbr->r_ctl.bbr_google_discount); 3651 cbw /= (uint64_t)1000; 3652 /* We don't apply a discount if it results in 0 */ 3653 if (cbw > 0) 3654 bw = cbw; 3655 } 3656 lentim = ((uint64_t)len * 3657 (uint64_t)USECS_IN_SECOND * 3658 (uint64_t)BBR_UNIT); 3659 res = lentim / ((uint64_t)gain * bw); 3660 if (res == 0) 3661 res = 1; 3662 usecs = (uint32_t)res; 3663 srtt = bbr_get_rtt(bbr, BBR_SRTT); 3664 if (bbr_hptsi_max_mul && bbr_hptsi_max_div && 3665 (bbr->rc_use_google == 0) && 3666 (usecs > ((srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div))) { 3667 /* 3668 * We cannot let the delay be more than 1/2 the srtt time. 3669 * Otherwise we cannot pace out or send properly. 3670 */ 3671 over = usecs = (srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div; 3672 BBR_STAT_INC(bbr_hpts_min_time); 3673 } 3674 if (!nolog) 3675 bbr_log_pacing_delay_calc(bbr, gain, len, cts, usecs, bw, over, 1); 3676 return (usecs); 3677 } 3678 3679 static void 3680 bbr_ack_received(struct tcpcb *tp, struct tcp_bbr *bbr, struct tcphdr *th, uint32_t bytes_this_ack, 3681 uint32_t sack_changed, uint32_t prev_acked, int32_t line, uint32_t losses) 3682 { 3683 INP_WLOCK_ASSERT(tp->t_inpcb); 3684 uint64_t bw; 3685 uint32_t cwnd, target_cwnd, saved_bytes, maxseg; 3686 int32_t meth; 3687 3688 #ifdef STATS 3689 if ((tp->t_flags & TF_GPUTINPROG) && 3690 SEQ_GEQ(th->th_ack, tp->gput_ack)) { 3691 /* 3692 * Strech acks and compressed acks will cause this to 3693 * oscillate but we are doing it the same way as the main 3694 * stack so it will be compariable (though possibly not 3695 * ideal). 3696 */ 3697 int32_t cgput; 3698 int64_t gput, time_stamp; 3699 3700 gput = (int64_t) (th->th_ack - tp->gput_seq) * 8; 3701 time_stamp = max(1, ((bbr->r_ctl.rc_rcvtime - tp->gput_ts) / 1000)); 3702 cgput = gput / time_stamp; 3703 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT, 3704 cgput); 3705 if (tp->t_stats_gput_prev > 0) 3706 stats_voi_update_abs_s32(tp->t_stats, 3707 VOI_TCP_GPUT_ND, 3708 ((gput - tp->t_stats_gput_prev) * 100) / 3709 tp->t_stats_gput_prev); 3710 tp->t_flags &= ~TF_GPUTINPROG; 3711 tp->t_stats_gput_prev = cgput; 3712 } 3713 #endif 3714 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3715 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 3716 /* We don't change anything in probe-rtt */ 3717 return; 3718 } 3719 maxseg = tp->t_maxseg - bbr->rc_last_options; 3720 saved_bytes = bytes_this_ack; 3721 bytes_this_ack += sack_changed; 3722 if (bytes_this_ack > prev_acked) { 3723 bytes_this_ack -= prev_acked; 3724 /* 3725 * A byte ack'd gives us a full mss 3726 * to be like linux i.e. they count packets. 3727 */ 3728 if ((bytes_this_ack < maxseg) && bbr->rc_use_google) 3729 bytes_this_ack = maxseg; 3730 } else { 3731 /* Unlikely */ 3732 bytes_this_ack = 0; 3733 } 3734 cwnd = tp->snd_cwnd; 3735 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3736 if (bw) 3737 target_cwnd = bbr_get_target_cwnd(bbr, 3738 bw, 3739 (uint32_t)bbr->r_ctl.rc_bbr_cwnd_gain); 3740 else 3741 target_cwnd = bbr_initial_cwnd(bbr, bbr->rc_tp); 3742 if (IN_RECOVERY(tp->t_flags) && 3743 (bbr->bbr_prev_in_rec == 0)) { 3744 /* 3745 * We are entering recovery and 3746 * thus packet conservation. 3747 */ 3748 bbr->pkt_conservation = 1; 3749 bbr->r_ctl.rc_recovery_start = bbr->r_ctl.rc_rcvtime; 3750 cwnd = ctf_flight_size(tp, 3751 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 3752 bytes_this_ack; 3753 } 3754 if (IN_RECOVERY(tp->t_flags)) { 3755 uint32_t flight; 3756 3757 bbr->bbr_prev_in_rec = 1; 3758 if (cwnd > losses) { 3759 cwnd -= losses; 3760 if (cwnd < maxseg) 3761 cwnd = maxseg; 3762 } else 3763 cwnd = maxseg; 3764 flight = ctf_flight_size(tp, 3765 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3766 bbr_log_type_cwndupd(bbr, flight, 0, 3767 losses, 10, 0, 0, line); 3768 if (bbr->pkt_conservation) { 3769 uint32_t time_in; 3770 3771 if (TSTMP_GEQ(bbr->r_ctl.rc_rcvtime, bbr->r_ctl.rc_recovery_start)) 3772 time_in = bbr->r_ctl.rc_rcvtime - bbr->r_ctl.rc_recovery_start; 3773 else 3774 time_in = 0; 3775 3776 if (time_in >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 3777 /* Clear packet conservation after an rttProp */ 3778 bbr->pkt_conservation = 0; 3779 } else { 3780 if ((flight + bytes_this_ack) > cwnd) 3781 cwnd = flight + bytes_this_ack; 3782 if (cwnd < get_min_cwnd(bbr)) 3783 cwnd = get_min_cwnd(bbr); 3784 tp->snd_cwnd = cwnd; 3785 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, 3786 prev_acked, 1, target_cwnd, th->th_ack, line); 3787 return; 3788 } 3789 } 3790 } else 3791 bbr->bbr_prev_in_rec = 0; 3792 if ((bbr->rc_use_google == 0) && bbr->r_ctl.restrict_growth) { 3793 bbr->r_ctl.restrict_growth--; 3794 if (bytes_this_ack > maxseg) 3795 bytes_this_ack = maxseg; 3796 } 3797 if (bbr->rc_filled_pipe) { 3798 /* 3799 * Here we have exited startup and filled the pipe. We will 3800 * thus allow the cwnd to shrink to the target. We hit here 3801 * mostly. 3802 */ 3803 uint32_t s_cwnd; 3804 3805 meth = 2; 3806 s_cwnd = min((cwnd + bytes_this_ack), target_cwnd); 3807 if (s_cwnd > cwnd) 3808 cwnd = s_cwnd; 3809 else if (bbr_cwnd_may_shrink || bbr->rc_use_google || bbr->rc_no_pacing) 3810 cwnd = s_cwnd; 3811 } else { 3812 /* 3813 * Here we are still in startup, we increase cwnd by what 3814 * has been acked. 3815 */ 3816 if ((cwnd < target_cwnd) || 3817 (bbr->rc_past_init_win == 0)) { 3818 meth = 3; 3819 cwnd += bytes_this_ack; 3820 } else { 3821 /* 3822 * Method 4 means we are at target so no gain in 3823 * startup and past the initial window. 3824 */ 3825 meth = 4; 3826 } 3827 } 3828 tp->snd_cwnd = max(cwnd, get_min_cwnd(bbr)); 3829 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, prev_acked, meth, target_cwnd, th->th_ack, line); 3830 } 3831 3832 static void 3833 tcp_bbr_partialack(struct tcpcb *tp) 3834 { 3835 struct tcp_bbr *bbr; 3836 3837 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3838 INP_WLOCK_ASSERT(tp->t_inpcb); 3839 if (ctf_flight_size(tp, 3840 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 3841 tp->snd_cwnd) { 3842 bbr->r_wanted_output = 1; 3843 } 3844 } 3845 3846 static void 3847 bbr_post_recovery(struct tcpcb *tp) 3848 { 3849 struct tcp_bbr *bbr; 3850 uint32_t flight; 3851 3852 INP_WLOCK_ASSERT(tp->t_inpcb); 3853 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3854 /* 3855 * Here we just exit recovery. 3856 */ 3857 EXIT_RECOVERY(tp->t_flags); 3858 /* Lock in our b/w reduction for the specified number of pkt-epochs */ 3859 bbr->r_recovery_bw = 0; 3860 tp->snd_recover = tp->snd_una; 3861 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3862 bbr->pkt_conservation = 0; 3863 if (bbr->rc_use_google == 0) { 3864 /* 3865 * For non-google mode lets 3866 * go ahead and make sure we clear 3867 * the recovery state so if we 3868 * bounce back in to recovery we 3869 * will do PC. 3870 */ 3871 bbr->bbr_prev_in_rec = 0; 3872 } 3873 bbr_log_type_exit_rec(bbr); 3874 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 3875 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 3876 bbr_log_type_cwndupd(bbr, 0, 0, 0, 15, 0, 0, __LINE__); 3877 } else { 3878 /* For probe-rtt case lets fix up its saved_cwnd */ 3879 if (bbr->r_ctl.rc_saved_cwnd < bbr->r_ctl.rc_cwnd_on_ent) { 3880 bbr->r_ctl.rc_saved_cwnd = bbr->r_ctl.rc_cwnd_on_ent; 3881 bbr_log_type_cwndupd(bbr, 0, 0, 0, 16, 0, 0, __LINE__); 3882 } 3883 } 3884 flight = ctf_flight_size(tp, 3885 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3886 if ((bbr->rc_use_google == 0) && 3887 bbr_do_red) { 3888 uint64_t val, lr2use; 3889 uint32_t maxseg, newcwnd, acks_inflight, ratio, cwnd; 3890 uint32_t *cwnd_p; 3891 3892 if (bbr_get_rtt(bbr, BBR_SRTT)) { 3893 val = ((uint64_t)bbr_get_rtt(bbr, BBR_RTT_PROP) * (uint64_t)1000); 3894 val /= bbr_get_rtt(bbr, BBR_SRTT); 3895 ratio = (uint32_t)val; 3896 } else 3897 ratio = 1000; 3898 3899 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, 3900 bbr->r_ctl.recovery_lr, 21, 3901 ratio, 3902 bbr->r_ctl.rc_red_cwnd_pe, 3903 __LINE__); 3904 if ((ratio < bbr_do_red) || (bbr_do_red == 0)) 3905 goto done; 3906 if (((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3907 bbr_prtt_slam_cwnd) || 3908 (bbr_sub_drain_slam_cwnd && 3909 (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 3910 bbr->rc_hit_state_1 && 3911 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) || 3912 ((bbr->rc_bbr_state == BBR_STATE_DRAIN) && 3913 bbr_slam_cwnd_in_main_drain)) { 3914 /* 3915 * Here we must poke at the saved cwnd 3916 * as well as the cwnd. 3917 */ 3918 cwnd = bbr->r_ctl.rc_saved_cwnd; 3919 cwnd_p = &bbr->r_ctl.rc_saved_cwnd; 3920 } else { 3921 cwnd = tp->snd_cwnd; 3922 cwnd_p = &tp->snd_cwnd; 3923 } 3924 maxseg = tp->t_maxseg - bbr->rc_last_options; 3925 /* Add the overall lr with the recovery lr */ 3926 if (bbr->r_ctl.rc_lost == 0) 3927 lr2use = 0; 3928 else if (bbr->r_ctl.rc_delivered == 0) 3929 lr2use = 1000; 3930 else { 3931 lr2use = bbr->r_ctl.rc_lost * 1000; 3932 lr2use /= bbr->r_ctl.rc_delivered; 3933 } 3934 lr2use += bbr->r_ctl.recovery_lr; 3935 acks_inflight = (flight / (maxseg * 2)); 3936 if (bbr_red_scale) { 3937 lr2use *= bbr_get_rtt(bbr, BBR_SRTT); 3938 lr2use /= bbr_red_scale; 3939 if ((bbr_red_growth_restrict) && 3940 ((bbr_get_rtt(bbr, BBR_SRTT)/bbr_red_scale) > 1)) 3941 bbr->r_ctl.restrict_growth += acks_inflight; 3942 } 3943 if (lr2use) { 3944 val = (uint64_t)cwnd * lr2use; 3945 val /= 1000; 3946 if (cwnd > val) 3947 newcwnd = roundup((cwnd - val), maxseg); 3948 else 3949 newcwnd = maxseg; 3950 } else { 3951 val = (uint64_t)cwnd * (uint64_t)bbr_red_mul; 3952 val /= (uint64_t)bbr_red_div; 3953 newcwnd = roundup((uint32_t)val, maxseg); 3954 } 3955 /* with standard delayed acks how many acks can I expect? */ 3956 if (bbr_drop_limit == 0) { 3957 /* 3958 * Anticpate how much we will 3959 * raise the cwnd based on the acks. 3960 */ 3961 if ((newcwnd + (acks_inflight * maxseg)) < get_min_cwnd(bbr)) { 3962 /* We do enforce the min (with the acks) */ 3963 newcwnd = (get_min_cwnd(bbr) - acks_inflight); 3964 } 3965 } else { 3966 /* 3967 * A strict drop limit of N is is inplace 3968 */ 3969 if (newcwnd < (bbr_drop_limit * maxseg)) { 3970 newcwnd = bbr_drop_limit * maxseg; 3971 } 3972 } 3973 /* For the next N acks do we restrict the growth */ 3974 *cwnd_p = newcwnd; 3975 if (tp->snd_cwnd > newcwnd) 3976 tp->snd_cwnd = newcwnd; 3977 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, val, 22, 3978 (uint32_t)lr2use, 3979 bbr_get_rtt(bbr, BBR_SRTT), __LINE__); 3980 bbr->r_ctl.rc_red_cwnd_pe = bbr->r_ctl.rc_pkt_epoch; 3981 } 3982 done: 3983 bbr->r_ctl.recovery_lr = 0; 3984 if (flight <= tp->snd_cwnd) { 3985 bbr->r_wanted_output = 1; 3986 } 3987 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3988 } 3989 3990 static void 3991 bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts) 3992 { 3993 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3994 /* Limit the drop in b/w to 1/2 our current filter. */ 3995 if (bbr->r_ctl.red_bw > bbr->r_ctl.rc_bbr_cur_del_rate) 3996 bbr->r_ctl.red_bw = bbr->r_ctl.rc_bbr_cur_del_rate; 3997 if (bbr->r_ctl.red_bw < (get_filter_value(&bbr->r_ctl.rc_delrate) / 2)) 3998 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate) / 2; 3999 tcp_bbr_tso_size_check(bbr, cts); 4000 } 4001 4002 static void 4003 bbr_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type, struct bbr_sendmap *rsm) 4004 { 4005 struct tcp_bbr *bbr; 4006 4007 INP_WLOCK_ASSERT(tp->t_inpcb); 4008 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 4009 switch (type) { 4010 case CC_NDUPACK: 4011 if (!IN_RECOVERY(tp->t_flags)) { 4012 tp->snd_recover = tp->snd_max; 4013 /* Start a new epoch */ 4014 bbr_set_pktepoch(bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 4015 if (bbr->rc_lt_is_sampling || bbr->rc_lt_use_bw) { 4016 /* 4017 * Move forward the lt epoch 4018 * so it won't count the truncated 4019 * epoch. 4020 */ 4021 bbr->r_ctl.rc_lt_epoch++; 4022 } 4023 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 4024 /* 4025 * Just like the policer detection code 4026 * if we are in startup we must push 4027 * forward the last startup epoch 4028 * to hide the truncated PE. 4029 */ 4030 bbr->r_ctl.rc_bbr_last_startup_epoch++; 4031 } 4032 bbr->r_ctl.rc_cwnd_on_ent = tp->snd_cwnd; 4033 ENTER_RECOVERY(tp->t_flags); 4034 bbr->rc_tlp_rtx_out = 0; 4035 bbr->r_ctl.recovery_lr = bbr->r_ctl.rc_pkt_epoch_loss_rate; 4036 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 4037 if (bbr->rc_inp->inp_in_hpts && 4038 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) == 0)) { 4039 /* 4040 * When we enter recovery, we need to restart 4041 * any timers. This may mean we gain an agg 4042 * early, which will be made up for at the last 4043 * rxt out. 4044 */ 4045 bbr->rc_timer_first = 1; 4046 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 4047 } 4048 /* 4049 * Calculate a new cwnd based on to the current 4050 * delivery rate with no gain. We get the bdp 4051 * without gaining it up like we normally would and 4052 * we use the last cur_del_rate. 4053 */ 4054 if ((bbr->rc_use_google == 0) && 4055 (bbr->r_ctl.bbr_rttprobe_gain_val || 4056 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT))) { 4057 tp->snd_cwnd = ctf_flight_size(tp, 4058 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 4059 (tp->t_maxseg - bbr->rc_last_options); 4060 if (tp->snd_cwnd < get_min_cwnd(bbr)) { 4061 /* We always gate to min cwnd */ 4062 tp->snd_cwnd = get_min_cwnd(bbr); 4063 } 4064 bbr_log_type_cwndupd(bbr, 0, 0, 0, 14, 0, 0, __LINE__); 4065 } 4066 bbr_log_type_enter_rec(bbr, rsm->r_start); 4067 } 4068 break; 4069 case CC_RTO_ERR: 4070 TCPSTAT_INC(tcps_sndrexmitbad); 4071 /* RTO was unnecessary, so reset everything. */ 4072 bbr_reset_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime); 4073 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 4074 tp->snd_cwnd = tp->snd_cwnd_prev; 4075 tp->snd_ssthresh = tp->snd_ssthresh_prev; 4076 tp->snd_recover = tp->snd_recover_prev; 4077 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 4078 bbr_log_type_cwndupd(bbr, 0, 0, 0, 13, 0, 0, __LINE__); 4079 } 4080 tp->t_badrxtwin = 0; 4081 break; 4082 } 4083 } 4084 4085 /* 4086 * Indicate whether this ack should be delayed. We can delay the ack if 4087 * following conditions are met: 4088 * - There is no delayed ack timer in progress. 4089 * - Our last ack wasn't a 0-sized window. We never want to delay 4090 * the ack that opens up a 0-sized window. 4091 * - LRO wasn't used for this segment. We make sure by checking that the 4092 * segment size is not larger than the MSS. 4093 * - Delayed acks are enabled or this is a half-synchronized T/TCP 4094 * connection. 4095 * - The data being acked is less than a full segment (a stretch ack 4096 * of more than a segment we should ack. 4097 * - nsegs is 1 (if its more than that we received more than 1 ack). 4098 */ 4099 #define DELAY_ACK(tp, bbr, nsegs) \ 4100 (((tp->t_flags & TF_RXWIN0SENT) == 0) && \ 4101 ((bbr->bbr_segs_rcvd + nsegs) < tp->t_delayed_ack) && \ 4102 (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN))) 4103 4104 /* 4105 * Return the lowest RSM in the map of 4106 * packets still in flight that is not acked. 4107 * This should normally find on the first one 4108 * since we remove packets from the send 4109 * map after they are marked ACKED. 4110 */ 4111 static struct bbr_sendmap * 4112 bbr_find_lowest_rsm(struct tcp_bbr *bbr) 4113 { 4114 struct bbr_sendmap *rsm; 4115 4116 /* 4117 * Walk the time-order transmitted list looking for an rsm that is 4118 * not acked. This will be the one that was sent the longest time 4119 * ago that is still outstanding. 4120 */ 4121 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_tmap, r_tnext) { 4122 if (rsm->r_flags & BBR_ACKED) { 4123 continue; 4124 } 4125 goto finish; 4126 } 4127 finish: 4128 return (rsm); 4129 } 4130 4131 static struct bbr_sendmap * 4132 bbr_find_high_nonack(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 4133 { 4134 struct bbr_sendmap *prsm; 4135 4136 /* 4137 * Walk the sequence order list backward until we hit and arrive at 4138 * the highest seq not acked. In theory when this is called it 4139 * should be the last segment (which it was not). 4140 */ 4141 prsm = rsm; 4142 TAILQ_FOREACH_REVERSE_FROM(prsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4143 if (prsm->r_flags & (BBR_ACKED | BBR_HAS_FIN)) { 4144 continue; 4145 } 4146 return (prsm); 4147 } 4148 return (NULL); 4149 } 4150 4151 /* 4152 * Returns to the caller the number of microseconds that 4153 * the packet can be outstanding before we think we 4154 * should have had an ack returned. 4155 */ 4156 static uint32_t 4157 bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm) 4158 { 4159 /* 4160 * lro is the flag we use to determine if we have seen reordering. 4161 * If it gets set we have seen reordering. The reorder logic either 4162 * works in one of two ways: 4163 * 4164 * If reorder-fade is configured, then we track the last time we saw 4165 * re-ordering occur. If we reach the point where enough time as 4166 * passed we no longer consider reordering has occuring. 4167 * 4168 * Or if reorder-face is 0, then once we see reordering we consider 4169 * the connection to alway be subject to reordering and just set lro 4170 * to 1. 4171 * 4172 * In the end if lro is non-zero we add the extra time for 4173 * reordering in. 4174 */ 4175 int32_t lro; 4176 uint32_t thresh, t_rxtcur; 4177 4178 if (srtt == 0) 4179 srtt = 1; 4180 if (bbr->r_ctl.rc_reorder_ts) { 4181 if (bbr->r_ctl.rc_reorder_fade) { 4182 if (SEQ_GEQ(cts, bbr->r_ctl.rc_reorder_ts)) { 4183 lro = cts - bbr->r_ctl.rc_reorder_ts; 4184 if (lro == 0) { 4185 /* 4186 * No time as passed since the last 4187 * reorder, mark it as reordering. 4188 */ 4189 lro = 1; 4190 } 4191 } else { 4192 /* Negative time? */ 4193 lro = 0; 4194 } 4195 if (lro > bbr->r_ctl.rc_reorder_fade) { 4196 /* Turn off reordering seen too */ 4197 bbr->r_ctl.rc_reorder_ts = 0; 4198 lro = 0; 4199 } 4200 } else { 4201 /* Reodering does not fade */ 4202 lro = 1; 4203 } 4204 } else { 4205 lro = 0; 4206 } 4207 thresh = srtt + bbr->r_ctl.rc_pkt_delay; 4208 if (lro) { 4209 /* It must be set, if not you get 1/4 rtt */ 4210 if (bbr->r_ctl.rc_reorder_shift) 4211 thresh += (srtt >> bbr->r_ctl.rc_reorder_shift); 4212 else 4213 thresh += (srtt >> 2); 4214 } else { 4215 thresh += 1000; 4216 } 4217 /* We don't let the rack timeout be above a RTO */ 4218 if ((bbr->rc_tp)->t_srtt == 0) 4219 t_rxtcur = BBR_INITIAL_RTO; 4220 else 4221 t_rxtcur = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 4222 if (thresh > t_rxtcur) { 4223 thresh = t_rxtcur; 4224 } 4225 /* And we don't want it above the RTO max either */ 4226 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4227 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4228 } 4229 bbr_log_thresh_choice(bbr, cts, thresh, lro, srtt, rsm, BBR_TO_FRM_RACK); 4230 return (thresh); 4231 } 4232 4233 /* 4234 * Return to the caller the amount of time in mico-seconds 4235 * that should be used for the TLP timer from the last 4236 * send time of this packet. 4237 */ 4238 static uint32_t 4239 bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, 4240 struct bbr_sendmap *rsm, uint32_t srtt, 4241 uint32_t cts) 4242 { 4243 uint32_t thresh, len, maxseg, t_rxtcur; 4244 struct bbr_sendmap *prsm; 4245 4246 if (srtt == 0) 4247 srtt = 1; 4248 if (bbr->rc_tlp_threshold) 4249 thresh = srtt + (srtt / bbr->rc_tlp_threshold); 4250 else 4251 thresh = (srtt * 2); 4252 maxseg = tp->t_maxseg - bbr->rc_last_options; 4253 /* Get the previous sent packet, if any */ 4254 len = rsm->r_end - rsm->r_start; 4255 4256 /* 2.1 behavior */ 4257 prsm = TAILQ_PREV(rsm, bbr_head, r_tnext); 4258 if (prsm && (len <= maxseg)) { 4259 /* 4260 * Two packets outstanding, thresh should be (2*srtt) + 4261 * possible inter-packet delay (if any). 4262 */ 4263 uint32_t inter_gap = 0; 4264 int idx, nidx; 4265 4266 idx = rsm->r_rtr_cnt - 1; 4267 nidx = prsm->r_rtr_cnt - 1; 4268 if (TSTMP_GEQ(rsm->r_tim_lastsent[nidx], prsm->r_tim_lastsent[idx])) { 4269 /* Yes it was sent later (or at the same time) */ 4270 inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx]; 4271 } 4272 thresh += inter_gap; 4273 } else if (len <= maxseg) { 4274 /* 4275 * Possibly compensate for delayed-ack. 4276 */ 4277 uint32_t alt_thresh; 4278 4279 alt_thresh = srtt + (srtt / 2) + bbr_delayed_ack_time; 4280 if (alt_thresh > thresh) 4281 thresh = alt_thresh; 4282 } 4283 /* Not above the current RTO */ 4284 if (tp->t_srtt == 0) 4285 t_rxtcur = BBR_INITIAL_RTO; 4286 else 4287 t_rxtcur = TICKS_2_USEC(tp->t_rxtcur); 4288 4289 bbr_log_thresh_choice(bbr, cts, thresh, t_rxtcur, srtt, rsm, BBR_TO_FRM_TLP); 4290 /* Not above an RTO */ 4291 if (thresh > t_rxtcur) { 4292 thresh = t_rxtcur; 4293 } 4294 /* Not above a RTO max */ 4295 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4296 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4297 } 4298 /* And now apply the user TLP min */ 4299 if (thresh < bbr_tlp_min) { 4300 thresh = bbr_tlp_min; 4301 } 4302 return (thresh); 4303 } 4304 4305 /* 4306 * Return one of three RTTs to use (in microseconds). 4307 */ 4308 static __inline uint32_t 4309 bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type) 4310 { 4311 uint32_t f_rtt; 4312 uint32_t srtt; 4313 4314 f_rtt = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 4315 if (get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) { 4316 /* We have no rtt at all */ 4317 if (bbr->rc_tp->t_srtt == 0) 4318 f_rtt = BBR_INITIAL_RTO; 4319 else 4320 f_rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4321 /* 4322 * Since we don't know how good the rtt is apply a 4323 * delayed-ack min 4324 */ 4325 if (f_rtt < bbr_delayed_ack_time) { 4326 f_rtt = bbr_delayed_ack_time; 4327 } 4328 } 4329 /* Take the filter version or last measured pkt-rtt */ 4330 if (rtt_type == BBR_RTT_PROP) { 4331 srtt = f_rtt; 4332 } else if (rtt_type == BBR_RTT_PKTRTT) { 4333 if (bbr->r_ctl.rc_pkt_epoch_rtt) { 4334 srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 4335 } else { 4336 /* No pkt rtt yet */ 4337 srtt = f_rtt; 4338 } 4339 } else if (rtt_type == BBR_RTT_RACK) { 4340 srtt = bbr->r_ctl.rc_last_rtt; 4341 /* We need to add in any internal delay for our timer */ 4342 if (bbr->rc_ack_was_delayed) 4343 srtt += bbr->r_ctl.rc_ack_hdwr_delay; 4344 } else if (rtt_type == BBR_SRTT) { 4345 srtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4346 } else { 4347 /* TSNH */ 4348 srtt = f_rtt; 4349 #ifdef BBR_INVARIANTS 4350 panic("Unknown rtt request type %d", rtt_type); 4351 #endif 4352 } 4353 return (srtt); 4354 } 4355 4356 static int 4357 bbr_is_lost(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t cts) 4358 { 4359 uint32_t thresh; 4360 4361 4362 thresh = bbr_calc_thresh_rack(bbr, bbr_get_rtt(bbr, BBR_RTT_RACK), 4363 cts, rsm); 4364 if ((cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) >= thresh) { 4365 /* It is lost (past time) */ 4366 return (1); 4367 } 4368 return (0); 4369 } 4370 4371 /* 4372 * Return a sendmap if we need to retransmit something. 4373 */ 4374 static struct bbr_sendmap * 4375 bbr_check_recovery_mode(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4376 { 4377 /* 4378 * Check to see that we don't need to fall into recovery. We will 4379 * need to do so if our oldest transmit is past the time we should 4380 * have had an ack. 4381 */ 4382 4383 struct bbr_sendmap *rsm; 4384 int32_t idx; 4385 4386 if (TAILQ_EMPTY(&bbr->r_ctl.rc_map)) { 4387 /* Nothing outstanding that we know of */ 4388 return (NULL); 4389 } 4390 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 4391 if (rsm == NULL) { 4392 /* Nothing in the transmit map */ 4393 return (NULL); 4394 } 4395 if (tp->t_flags & TF_SENTFIN) { 4396 /* Fin restricted, don't find anything once a fin is sent */ 4397 return (NULL); 4398 } 4399 if (rsm->r_flags & BBR_ACKED) { 4400 /* 4401 * Ok the first one is acked (this really should not happen 4402 * since we remove the from the tmap once they are acked) 4403 */ 4404 rsm = bbr_find_lowest_rsm(bbr); 4405 if (rsm == NULL) 4406 return (NULL); 4407 } 4408 idx = rsm->r_rtr_cnt - 1; 4409 if (SEQ_LEQ(cts, rsm->r_tim_lastsent[idx])) { 4410 /* Send timestamp is the same or less? can't be ready */ 4411 return (NULL); 4412 } 4413 /* Get our RTT time */ 4414 if (bbr_is_lost(bbr, rsm, cts) && 4415 ((rsm->r_dupack >= DUP_ACK_THRESHOLD) || 4416 (rsm->r_flags & BBR_SACK_PASSED))) { 4417 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4418 rsm->r_flags |= BBR_MARKED_LOST; 4419 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4420 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4421 } 4422 bbr_cong_signal(tp, NULL, CC_NDUPACK, rsm); 4423 #ifdef BBR_INVARIANTS 4424 if ((rsm->r_end - rsm->r_start) == 0) 4425 panic("tp:%p bbr:%p rsm:%p length is 0?", tp, bbr, rsm); 4426 #endif 4427 return (rsm); 4428 } 4429 return (NULL); 4430 } 4431 4432 /* 4433 * RACK Timer, here we simply do logging and house keeping. 4434 * the normal bbr_output_wtime() function will call the 4435 * appropriate thing to check if we need to do a RACK retransmit. 4436 * We return 1, saying don't proceed with bbr_output_wtime only 4437 * when all timers have been stopped (destroyed PCB?). 4438 */ 4439 static int 4440 bbr_timeout_rack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4441 { 4442 /* 4443 * This timer simply provides an internal trigger to send out data. 4444 * The check_recovery_mode call will see if there are needed 4445 * retransmissions, if so we will enter fast-recovery. The output 4446 * call may or may not do the same thing depending on sysctl 4447 * settings. 4448 */ 4449 uint32_t lost; 4450 4451 if (bbr->rc_all_timers_stopped) { 4452 return (1); 4453 } 4454 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4455 /* Its not time yet */ 4456 return (0); 4457 } 4458 BBR_STAT_INC(bbr_to_tot); 4459 lost = bbr->r_ctl.rc_lost; 4460 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4461 bbr_set_state(tp, bbr, 0); 4462 bbr_log_to_event(bbr, cts, BBR_TO_FRM_RACK); 4463 if (bbr->r_ctl.rc_resend == NULL) { 4464 /* Lets do the check here */ 4465 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 4466 } 4467 if (bbr_policer_call_from_rack_to) 4468 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 4469 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK; 4470 return (0); 4471 } 4472 4473 static __inline void 4474 bbr_clone_rsm(struct tcp_bbr *bbr, struct bbr_sendmap *nrsm, struct bbr_sendmap *rsm, uint32_t start) 4475 { 4476 int idx; 4477 4478 nrsm->r_start = start; 4479 nrsm->r_end = rsm->r_end; 4480 nrsm->r_rtr_cnt = rsm->r_rtr_cnt; 4481 nrsm->r_flags = rsm->r_flags; 4482 /* We don't transfer forward the SYN flag */ 4483 nrsm->r_flags &= ~BBR_HAS_SYN; 4484 /* We move forward the FIN flag, not that this should happen */ 4485 rsm->r_flags &= ~BBR_HAS_FIN; 4486 nrsm->r_dupack = rsm->r_dupack; 4487 nrsm->r_rtr_bytes = 0; 4488 nrsm->r_is_gain = rsm->r_is_gain; 4489 nrsm->r_is_drain = rsm->r_is_drain; 4490 nrsm->r_delivered = rsm->r_delivered; 4491 nrsm->r_ts_valid = rsm->r_ts_valid; 4492 nrsm->r_del_ack_ts = rsm->r_del_ack_ts; 4493 nrsm->r_del_time = rsm->r_del_time; 4494 nrsm->r_app_limited = rsm->r_app_limited; 4495 nrsm->r_first_sent_time = rsm->r_first_sent_time; 4496 nrsm->r_flight_at_send = rsm->r_flight_at_send; 4497 /* We split a piece the lower section looses any just_ret flag. */ 4498 nrsm->r_bbr_state = rsm->r_bbr_state; 4499 for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { 4500 nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; 4501 } 4502 rsm->r_end = nrsm->r_start; 4503 idx = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 4504 idx /= 8; 4505 /* Check if we got too small */ 4506 if ((rsm->r_is_smallmap == 0) && 4507 ((rsm->r_end - rsm->r_start) <= idx)) { 4508 bbr->r_ctl.rc_num_small_maps_alloced++; 4509 rsm->r_is_smallmap = 1; 4510 } 4511 /* Check the new one as well */ 4512 if ((nrsm->r_end - nrsm->r_start) <= idx) { 4513 bbr->r_ctl.rc_num_small_maps_alloced++; 4514 nrsm->r_is_smallmap = 1; 4515 } 4516 } 4517 4518 static int 4519 bbr_sack_mergable(struct bbr_sendmap *at, 4520 uint32_t start, uint32_t end) 4521 { 4522 /* 4523 * Given a sack block defined by 4524 * start and end, and a current postion 4525 * at. Return 1 if either side of at 4526 * would show that the block is mergable 4527 * to that side. A block to be mergable 4528 * must have overlap with the start/end 4529 * and be in the SACK'd state. 4530 */ 4531 struct bbr_sendmap *l_rsm; 4532 struct bbr_sendmap *r_rsm; 4533 4534 /* first get the either side blocks */ 4535 l_rsm = TAILQ_PREV(at, bbr_head, r_next); 4536 r_rsm = TAILQ_NEXT(at, r_next); 4537 if (l_rsm && (l_rsm->r_flags & BBR_ACKED)) { 4538 /* Potentially mergeable */ 4539 if ((l_rsm->r_end == start) || 4540 (SEQ_LT(start, l_rsm->r_end) && 4541 SEQ_GT(end, l_rsm->r_end))) { 4542 /* 4543 * map blk |------| 4544 * sack blk |------| 4545 * <or> 4546 * map blk |------| 4547 * sack blk |------| 4548 */ 4549 return (1); 4550 } 4551 } 4552 if (r_rsm && (r_rsm->r_flags & BBR_ACKED)) { 4553 /* Potentially mergeable */ 4554 if ((r_rsm->r_start == end) || 4555 (SEQ_LT(start, r_rsm->r_start) && 4556 SEQ_GT(end, r_rsm->r_start))) { 4557 /* 4558 * map blk |---------| 4559 * sack blk |----| 4560 * <or> 4561 * map blk |---------| 4562 * sack blk |-------| 4563 */ 4564 return (1); 4565 } 4566 } 4567 return (0); 4568 } 4569 4570 static struct bbr_sendmap * 4571 bbr_merge_rsm(struct tcp_bbr *bbr, 4572 struct bbr_sendmap *l_rsm, 4573 struct bbr_sendmap *r_rsm) 4574 { 4575 /* 4576 * We are merging two ack'd RSM's, 4577 * the l_rsm is on the left (lower seq 4578 * values) and the r_rsm is on the right 4579 * (higher seq value). The simplest way 4580 * to merge these is to move the right 4581 * one into the left. I don't think there 4582 * is any reason we need to try to find 4583 * the oldest (or last oldest retransmitted). 4584 */ 4585 l_rsm->r_end = r_rsm->r_end; 4586 if (l_rsm->r_dupack < r_rsm->r_dupack) 4587 l_rsm->r_dupack = r_rsm->r_dupack; 4588 if (r_rsm->r_rtr_bytes) 4589 l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes; 4590 if (r_rsm->r_in_tmap) { 4591 /* This really should not happen */ 4592 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, r_rsm, r_tnext); 4593 } 4594 if (r_rsm->r_app_limited) 4595 l_rsm->r_app_limited = r_rsm->r_app_limited; 4596 /* Now the flags */ 4597 if (r_rsm->r_flags & BBR_HAS_FIN) 4598 l_rsm->r_flags |= BBR_HAS_FIN; 4599 if (r_rsm->r_flags & BBR_TLP) 4600 l_rsm->r_flags |= BBR_TLP; 4601 if (r_rsm->r_flags & BBR_RWND_COLLAPSED) 4602 l_rsm->r_flags |= BBR_RWND_COLLAPSED; 4603 if (r_rsm->r_flags & BBR_MARKED_LOST) { 4604 /* This really should not happen */ 4605 bbr->r_ctl.rc_lost_bytes -= r_rsm->r_end - r_rsm->r_start; 4606 } 4607 TAILQ_REMOVE(&bbr->r_ctl.rc_map, r_rsm, r_next); 4608 if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) { 4609 /* Transfer the split limit to the map we free */ 4610 r_rsm->r_limit_type = l_rsm->r_limit_type; 4611 l_rsm->r_limit_type = 0; 4612 } 4613 bbr_free(bbr, r_rsm); 4614 return(l_rsm); 4615 } 4616 4617 /* 4618 * TLP Timer, here we simply setup what segment we want to 4619 * have the TLP expire on, the normal bbr_output_wtime() will then 4620 * send it out. 4621 * 4622 * We return 1, saying don't proceed with bbr_output_wtime only 4623 * when all timers have been stopped (destroyed PCB?). 4624 */ 4625 static int 4626 bbr_timeout_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4627 { 4628 /* 4629 * Tail Loss Probe. 4630 */ 4631 struct bbr_sendmap *rsm = NULL; 4632 struct socket *so; 4633 uint32_t amm; 4634 uint32_t out, avail; 4635 uint32_t maxseg; 4636 int collapsed_win = 0; 4637 4638 if (bbr->rc_all_timers_stopped) { 4639 return (1); 4640 } 4641 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4642 /* Its not time yet */ 4643 return (0); 4644 } 4645 if (bbr_progress_timeout_check(bbr)) { 4646 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4647 return (1); 4648 } 4649 /* Did we somehow get into persists? */ 4650 if (bbr->rc_in_persist) { 4651 return (0); 4652 } 4653 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4654 bbr_set_state(tp, bbr, 0); 4655 BBR_STAT_INC(bbr_tlp_tot); 4656 maxseg = tp->t_maxseg - bbr->rc_last_options; 4657 #ifdef KERN_TLS 4658 if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { 4659 /* 4660 * For hardware TLS we do *not* want to send 4661 * new data. 4662 */ 4663 goto need_retran; 4664 } 4665 #endif 4666 /* 4667 * A TLP timer has expired. We have been idle for 2 rtts. So we now 4668 * need to figure out how to force a full MSS segment out. 4669 */ 4670 so = tp->t_inpcb->inp_socket; 4671 avail = sbavail(&so->so_snd); 4672 out = ctf_outstanding(tp); 4673 if (out > tp->snd_wnd) { 4674 /* special case, we need a retransmission */ 4675 collapsed_win = 1; 4676 goto need_retran; 4677 } 4678 if (avail > out) { 4679 /* New data is available */ 4680 amm = avail - out; 4681 if (amm > maxseg) { 4682 amm = maxseg; 4683 } else if ((amm < maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) { 4684 /* not enough to fill a MTU and no-delay is off */ 4685 goto need_retran; 4686 } 4687 /* Set the send-new override */ 4688 if ((out + amm) <= tp->snd_wnd) { 4689 bbr->rc_tlp_new_data = 1; 4690 } else { 4691 goto need_retran; 4692 } 4693 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 4694 bbr->r_ctl.rc_last_tlp_seq = tp->snd_max; 4695 bbr->r_ctl.rc_tlp_send = NULL; 4696 /* cap any slots */ 4697 BBR_STAT_INC(bbr_tlp_newdata); 4698 goto send; 4699 } 4700 need_retran: 4701 /* 4702 * Ok we need to arrange the last un-acked segment to be re-sent, or 4703 * optionally the first un-acked segment. 4704 */ 4705 if (collapsed_win == 0) { 4706 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 4707 if (rsm && (BBR_ACKED | BBR_HAS_FIN)) { 4708 rsm = bbr_find_high_nonack(bbr, rsm); 4709 } 4710 if (rsm == NULL) { 4711 goto restore; 4712 } 4713 } else { 4714 /* 4715 * We must find the last segment 4716 * that was acceptable by the client. 4717 */ 4718 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4719 if ((rsm->r_flags & BBR_RWND_COLLAPSED) == 0) { 4720 /* Found one */ 4721 break; 4722 } 4723 } 4724 if (rsm == NULL) { 4725 /* None? if so send the first */ 4726 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 4727 if (rsm == NULL) 4728 goto restore; 4729 } 4730 } 4731 if ((rsm->r_end - rsm->r_start) > maxseg) { 4732 /* 4733 * We need to split this the last segment in two. 4734 */ 4735 struct bbr_sendmap *nrsm; 4736 4737 nrsm = bbr_alloc_full_limit(bbr); 4738 if (nrsm == NULL) { 4739 /* 4740 * We can't get memory to split, we can either just 4741 * not split it. Or retransmit the whole piece, lets 4742 * do the large send (BTLP :-) ). 4743 */ 4744 goto go_for_it; 4745 } 4746 bbr_clone_rsm(bbr, nrsm, rsm, (rsm->r_end - maxseg)); 4747 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 4748 if (rsm->r_in_tmap) { 4749 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 4750 nrsm->r_in_tmap = 1; 4751 } 4752 rsm->r_flags &= (~BBR_HAS_FIN); 4753 rsm = nrsm; 4754 } 4755 go_for_it: 4756 bbr->r_ctl.rc_tlp_send = rsm; 4757 bbr->rc_tlp_rtx_out = 1; 4758 if (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) { 4759 bbr->r_ctl.rc_tlp_seg_send_cnt++; 4760 tp->t_rxtshift++; 4761 } else { 4762 bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; 4763 bbr->r_ctl.rc_tlp_seg_send_cnt = 1; 4764 } 4765 send: 4766 if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { 4767 /* 4768 * Can't [re]/transmit a segment we have retranmitted the 4769 * max times. We need the retransmit timer to take over. 4770 */ 4771 restore: 4772 bbr->rc_tlp_new_data = 0; 4773 bbr->r_ctl.rc_tlp_send = NULL; 4774 if (rsm) 4775 rsm->r_flags &= ~BBR_TLP; 4776 BBR_STAT_INC(bbr_tlp_retran_fail); 4777 return (0); 4778 } else if (rsm) { 4779 rsm->r_flags |= BBR_TLP; 4780 } 4781 if (rsm && (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) && 4782 (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend)) { 4783 /* 4784 * We have retransmitted to many times for TLP. Switch to 4785 * the regular RTO timer 4786 */ 4787 goto restore; 4788 } 4789 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TLP); 4790 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; 4791 return (0); 4792 } 4793 4794 /* 4795 * Delayed ack Timer, here we simply need to setup the 4796 * ACK_NOW flag and remove the DELACK flag. From there 4797 * the output routine will send the ack out. 4798 * 4799 * We only return 1, saying don't proceed, if all timers 4800 * are stopped (destroyed PCB?). 4801 */ 4802 static int 4803 bbr_timeout_delack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4804 { 4805 if (bbr->rc_all_timers_stopped) { 4806 return (1); 4807 } 4808 bbr_log_to_event(bbr, cts, BBR_TO_FRM_DELACK); 4809 tp->t_flags &= ~TF_DELACK; 4810 tp->t_flags |= TF_ACKNOW; 4811 TCPSTAT_INC(tcps_delack); 4812 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK; 4813 return (0); 4814 } 4815 4816 /* 4817 * Persists timer, here we simply need to setup the 4818 * FORCE-DATA flag the output routine will send 4819 * the one byte send. 4820 * 4821 * We only return 1, saying don't proceed, if all timers 4822 * are stopped (destroyed PCB?). 4823 */ 4824 static int 4825 bbr_timeout_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4826 { 4827 struct tcptemp *t_template; 4828 int32_t retval = 1; 4829 4830 if (bbr->rc_all_timers_stopped) { 4831 return (1); 4832 } 4833 if (bbr->rc_in_persist == 0) 4834 return (0); 4835 KASSERT(tp->t_inpcb != NULL, 4836 ("%s: tp %p tp->t_inpcb == NULL", __func__, tp)); 4837 /* 4838 * Persistence timer into zero window. Force a byte to be output, if 4839 * possible. 4840 */ 4841 bbr_log_to_event(bbr, cts, BBR_TO_FRM_PERSIST); 4842 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT; 4843 TCPSTAT_INC(tcps_persisttimeo); 4844 /* 4845 * Have we exceeded the user specified progress time? 4846 */ 4847 if (bbr_progress_timeout_check(bbr)) { 4848 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4849 goto out; 4850 } 4851 /* 4852 * Hack: if the peer is dead/unreachable, we do not time out if the 4853 * window is closed. After a full backoff, drop the connection if 4854 * the idle time (no responses to probes) reaches the maximum 4855 * backoff that we would use if retransmitting. 4856 */ 4857 if (tp->t_rxtshift == TCP_MAXRXTSHIFT && 4858 (ticks - tp->t_rcvtime >= tcp_maxpersistidle || 4859 ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { 4860 TCPSTAT_INC(tcps_persistdrop); 4861 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4862 goto out; 4863 } 4864 if ((sbavail(&bbr->rc_inp->inp_socket->so_snd) == 0) && 4865 tp->snd_una == tp->snd_max) { 4866 bbr_exit_persist(tp, bbr, cts, __LINE__); 4867 retval = 0; 4868 goto out; 4869 } 4870 /* 4871 * If the user has closed the socket then drop a persisting 4872 * connection after a much reduced timeout. 4873 */ 4874 if (tp->t_state > TCPS_CLOSE_WAIT && 4875 (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) { 4876 TCPSTAT_INC(tcps_persistdrop); 4877 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4878 goto out; 4879 } 4880 t_template = tcpip_maketemplate(bbr->rc_inp); 4881 if (t_template) { 4882 tcp_respond(tp, t_template->tt_ipgen, 4883 &t_template->tt_t, (struct mbuf *)NULL, 4884 tp->rcv_nxt, tp->snd_una - 1, 0); 4885 /* This sends an ack */ 4886 if (tp->t_flags & TF_DELACK) 4887 tp->t_flags &= ~TF_DELACK; 4888 free(t_template, M_TEMP); 4889 } 4890 if (tp->t_rxtshift < TCP_MAXRXTSHIFT) 4891 tp->t_rxtshift++; 4892 bbr_start_hpts_timer(bbr, tp, cts, 3, 0, 0); 4893 out: 4894 return (retval); 4895 } 4896 4897 /* 4898 * If a keepalive goes off, we had no other timers 4899 * happening. We always return 1 here since this 4900 * routine either drops the connection or sends 4901 * out a segment with respond. 4902 */ 4903 static int 4904 bbr_timeout_keepalive(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4905 { 4906 struct tcptemp *t_template; 4907 struct inpcb *inp; 4908 4909 if (bbr->rc_all_timers_stopped) { 4910 return (1); 4911 } 4912 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP; 4913 inp = tp->t_inpcb; 4914 bbr_log_to_event(bbr, cts, BBR_TO_FRM_KEEP); 4915 /* 4916 * Keep-alive timer went off; send something or drop connection if 4917 * idle for too long. 4918 */ 4919 TCPSTAT_INC(tcps_keeptimeo); 4920 if (tp->t_state < TCPS_ESTABLISHED) 4921 goto dropit; 4922 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && 4923 tp->t_state <= TCPS_CLOSING) { 4924 if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp)) 4925 goto dropit; 4926 /* 4927 * Send a packet designed to force a response if the peer is 4928 * up and reachable: either an ACK if the connection is 4929 * still alive, or an RST if the peer has closed the 4930 * connection due to timeout or reboot. Using sequence 4931 * number tp->snd_una-1 causes the transmitted zero-length 4932 * segment to lie outside the receive window; by the 4933 * protocol spec, this requires the correspondent TCP to 4934 * respond. 4935 */ 4936 TCPSTAT_INC(tcps_keepprobe); 4937 t_template = tcpip_maketemplate(inp); 4938 if (t_template) { 4939 tcp_respond(tp, t_template->tt_ipgen, 4940 &t_template->tt_t, (struct mbuf *)NULL, 4941 tp->rcv_nxt, tp->snd_una - 1, 0); 4942 free(t_template, M_TEMP); 4943 } 4944 } 4945 bbr_start_hpts_timer(bbr, tp, cts, 4, 0, 0); 4946 return (1); 4947 dropit: 4948 TCPSTAT_INC(tcps_keepdrops); 4949 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4950 return (1); 4951 } 4952 4953 /* 4954 * Retransmit helper function, clear up all the ack 4955 * flags and take care of important book keeping. 4956 */ 4957 static void 4958 bbr_remxt_tmr(struct tcpcb *tp) 4959 { 4960 /* 4961 * The retransmit timer went off, all sack'd blocks must be 4962 * un-acked. 4963 */ 4964 struct bbr_sendmap *rsm, *trsm = NULL; 4965 struct tcp_bbr *bbr; 4966 uint32_t cts, lost; 4967 4968 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 4969 cts = tcp_get_usecs(&bbr->rc_tv); 4970 lost = bbr->r_ctl.rc_lost; 4971 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4972 bbr_set_state(tp, bbr, 0); 4973 4974 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 4975 if (rsm->r_flags & BBR_ACKED) { 4976 uint32_t old_flags; 4977 4978 rsm->r_dupack = 0; 4979 if (rsm->r_in_tmap == 0) { 4980 /* We must re-add it back to the tlist */ 4981 if (trsm == NULL) { 4982 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 4983 } else { 4984 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, trsm, rsm, r_tnext); 4985 } 4986 rsm->r_in_tmap = 1; 4987 } 4988 old_flags = rsm->r_flags; 4989 rsm->r_flags |= BBR_RXT_CLEARED; 4990 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS); 4991 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 4992 } else { 4993 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4994 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4995 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4996 } 4997 if (bbr_marks_rxt_sack_passed) { 4998 /* 4999 * With this option, we will rack out 5000 * in 1ms increments the rest of the packets. 5001 */ 5002 rsm->r_flags |= BBR_SACK_PASSED | BBR_MARKED_LOST; 5003 rsm->r_flags &= ~BBR_WAS_SACKPASS; 5004 } else { 5005 /* 5006 * With this option we only mark them lost 5007 * and remove all sack'd markings. We will run 5008 * another RXT or a TLP. This will cause 5009 * us to eventually send more based on what 5010 * ack's come in. 5011 */ 5012 rsm->r_flags |= BBR_MARKED_LOST; 5013 rsm->r_flags &= ~BBR_WAS_SACKPASS; 5014 rsm->r_flags &= ~BBR_SACK_PASSED; 5015 } 5016 } 5017 trsm = rsm; 5018 } 5019 bbr->r_ctl.rc_resend = TAILQ_FIRST(&bbr->r_ctl.rc_map); 5020 /* Clear the count (we just un-acked them) */ 5021 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TMR); 5022 bbr->rc_tlp_new_data = 0; 5023 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 5024 /* zap the behindness on a rxt */ 5025 bbr->r_ctl.rc_hptsi_agg_delay = 0; 5026 bbr->r_agg_early_set = 0; 5027 bbr->r_ctl.rc_agg_early = 0; 5028 bbr->rc_tlp_rtx_out = 0; 5029 bbr->r_ctl.rc_sacked = 0; 5030 bbr->r_ctl.rc_sacklast = NULL; 5031 bbr->r_timer_override = 1; 5032 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 5033 } 5034 5035 /* 5036 * Re-transmit timeout! If we drop the PCB we will return 1, otherwise 5037 * we will setup to retransmit the lowest seq number outstanding. 5038 */ 5039 static int 5040 bbr_timeout_rxt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 5041 { 5042 int32_t rexmt; 5043 int32_t retval = 0; 5044 5045 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT; 5046 if (bbr->rc_all_timers_stopped) { 5047 return (1); 5048 } 5049 if (TCPS_HAVEESTABLISHED(tp->t_state) && 5050 (tp->snd_una == tp->snd_max)) { 5051 /* Nothing outstanding .. nothing to do */ 5052 return (0); 5053 } 5054 /* 5055 * Retransmission timer went off. Message has not been acked within 5056 * retransmit interval. Back off to a longer retransmit interval 5057 * and retransmit one segment. 5058 */ 5059 if (bbr_progress_timeout_check(bbr)) { 5060 retval = 1; 5061 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 5062 goto out; 5063 } 5064 bbr_remxt_tmr(tp); 5065 if ((bbr->r_ctl.rc_resend == NULL) || 5066 ((bbr->r_ctl.rc_resend->r_flags & BBR_RWND_COLLAPSED) == 0)) { 5067 /* 5068 * If the rwnd collapsed on 5069 * the one we are retransmitting 5070 * it does not count against the 5071 * rxt count. 5072 */ 5073 tp->t_rxtshift++; 5074 } 5075 if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { 5076 tp->t_rxtshift = TCP_MAXRXTSHIFT; 5077 TCPSTAT_INC(tcps_timeoutdrop); 5078 retval = 1; 5079 tcp_set_inp_to_drop(bbr->rc_inp, 5080 (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT)); 5081 goto out; 5082 } 5083 if (tp->t_state == TCPS_SYN_SENT) { 5084 /* 5085 * If the SYN was retransmitted, indicate CWND to be limited 5086 * to 1 segment in cc_conn_init(). 5087 */ 5088 tp->snd_cwnd = 1; 5089 } else if (tp->t_rxtshift == 1) { 5090 /* 5091 * first retransmit; record ssthresh and cwnd so they can be 5092 * recovered if this turns out to be a "bad" retransmit. A 5093 * retransmit is considered "bad" if an ACK for this segment 5094 * is received within RTT/2 interval; the assumption here is 5095 * that the ACK was already in flight. See "On Estimating 5096 * End-to-End Network Path Properties" by Allman and Paxson 5097 * for more details. 5098 */ 5099 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5100 if (!IN_RECOVERY(tp->t_flags)) { 5101 tp->snd_cwnd_prev = tp->snd_cwnd; 5102 tp->snd_ssthresh_prev = tp->snd_ssthresh; 5103 tp->snd_recover_prev = tp->snd_recover; 5104 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1)); 5105 tp->t_flags |= TF_PREVVALID; 5106 } else { 5107 tp->t_flags &= ~TF_PREVVALID; 5108 } 5109 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5110 } else { 5111 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5112 tp->t_flags &= ~TF_PREVVALID; 5113 } 5114 TCPSTAT_INC(tcps_rexmttimeo); 5115 if ((tp->t_state == TCPS_SYN_SENT) || 5116 (tp->t_state == TCPS_SYN_RECEIVED)) 5117 rexmt = USEC_2_TICKS(BBR_INITIAL_RTO) * tcp_backoff[tp->t_rxtshift]; 5118 else 5119 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; 5120 TCPT_RANGESET(tp->t_rxtcur, rexmt, 5121 MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), 5122 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 5123 /* 5124 * We enter the path for PLMTUD if connection is established or, if 5125 * connection is FIN_WAIT_1 status, reason for the last is that if 5126 * amount of data we send is very small, we could send it in couple 5127 * of packets and process straight to FIN. In that case we won't 5128 * catch ESTABLISHED state. 5129 */ 5130 if (V_tcp_pmtud_blackhole_detect && (((tp->t_state == TCPS_ESTABLISHED)) 5131 || (tp->t_state == TCPS_FIN_WAIT_1))) { 5132 #ifdef INET6 5133 int32_t isipv6; 5134 #endif 5135 5136 /* 5137 * Idea here is that at each stage of mtu probe (usually, 5138 * 1448 -> 1188 -> 524) should be given 2 chances to recover 5139 * before further clamping down. 'tp->t_rxtshift % 2 == 0' 5140 * should take care of that. 5141 */ 5142 if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) == 5143 (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) && 5144 (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 && 5145 tp->t_rxtshift % 2 == 0)) { 5146 /* 5147 * Enter Path MTU Black-hole Detection mechanism: - 5148 * Disable Path MTU Discovery (IP "DF" bit). - 5149 * Reduce MTU to lower value than what we negotiated 5150 * with peer. 5151 */ 5152 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) { 5153 /* 5154 * Record that we may have found a black 5155 * hole. 5156 */ 5157 tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE; 5158 /* Keep track of previous MSS. */ 5159 tp->t_pmtud_saved_maxseg = tp->t_maxseg; 5160 } 5161 /* 5162 * Reduce the MSS to blackhole value or to the 5163 * default in an attempt to retransmit. 5164 */ 5165 #ifdef INET6 5166 isipv6 = bbr->r_is_v6; 5167 if (isipv6 && 5168 tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) { 5169 /* Use the sysctl tuneable blackhole MSS. */ 5170 tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss; 5171 TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5172 } else if (isipv6) { 5173 /* Use the default MSS. */ 5174 tp->t_maxseg = V_tcp_v6mssdflt; 5175 /* 5176 * Disable Path MTU Discovery when we switch 5177 * to minmss. 5178 */ 5179 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5180 TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5181 } 5182 #endif 5183 #if defined(INET6) && defined(INET) 5184 else 5185 #endif 5186 #ifdef INET 5187 if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) { 5188 /* Use the sysctl tuneable blackhole MSS. */ 5189 tp->t_maxseg = V_tcp_pmtud_blackhole_mss; 5190 TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5191 } else { 5192 /* Use the default MSS. */ 5193 tp->t_maxseg = V_tcp_mssdflt; 5194 /* 5195 * Disable Path MTU Discovery when we switch 5196 * to minmss. 5197 */ 5198 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5199 TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5200 } 5201 #endif 5202 } else { 5203 /* 5204 * If further retransmissions are still unsuccessful 5205 * with a lowered MTU, maybe this isn't a blackhole 5206 * and we restore the previous MSS and blackhole 5207 * detection flags. The limit '6' is determined by 5208 * giving each probe stage (1448, 1188, 524) 2 5209 * chances to recover. 5210 */ 5211 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) && 5212 (tp->t_rxtshift >= 6)) { 5213 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 5214 tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE; 5215 tp->t_maxseg = tp->t_pmtud_saved_maxseg; 5216 TCPSTAT_INC(tcps_pmtud_blackhole_failed); 5217 } 5218 } 5219 } 5220 /* 5221 * Disable RFC1323 and SACK if we haven't got any response to our 5222 * third SYN to work-around some broken terminal servers (most of 5223 * which have hopefully been retired) that have bad VJ header 5224 * compression code which trashes TCP segments containing 5225 * unknown-to-them TCP options. 5226 */ 5227 if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && 5228 (tp->t_rxtshift == 3)) 5229 tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT); 5230 /* 5231 * If we backed off this far, our srtt estimate is probably bogus. 5232 * Clobber it so we'll take the next rtt measurement as our srtt; 5233 * move the current srtt into rttvar to keep the current retransmit 5234 * times until then. 5235 */ 5236 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) { 5237 #ifdef INET6 5238 if (bbr->r_is_v6) 5239 in6_losing(tp->t_inpcb); 5240 else 5241 #endif 5242 in_losing(tp->t_inpcb); 5243 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT); 5244 tp->t_srtt = 0; 5245 } 5246 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 5247 tp->snd_recover = tp->snd_max; 5248 tp->t_flags |= TF_ACKNOW; 5249 tp->t_rtttime = 0; 5250 out: 5251 return (retval); 5252 } 5253 5254 static int 5255 bbr_process_timers(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, uint8_t hpts_calling) 5256 { 5257 int32_t ret = 0; 5258 int32_t timers = (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK); 5259 5260 if (timers == 0) { 5261 return (0); 5262 } 5263 if (tp->t_state == TCPS_LISTEN) { 5264 /* no timers on listen sockets */ 5265 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) 5266 return (0); 5267 return (1); 5268 } 5269 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 5270 uint32_t left; 5271 5272 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) { 5273 ret = -1; 5274 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5275 return (0); 5276 } 5277 if (hpts_calling == 0) { 5278 ret = -2; 5279 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5280 return (0); 5281 } 5282 /* 5283 * Ok our timer went off early and we are not paced false 5284 * alarm, go back to sleep. 5285 */ 5286 left = bbr->r_ctl.rc_timer_exp - cts; 5287 ret = -3; 5288 bbr_log_to_processing(bbr, cts, ret, left, hpts_calling); 5289 tcp_hpts_insert(tp->t_inpcb, HPTS_USEC_TO_SLOTS(left)); 5290 return (1); 5291 } 5292 bbr->rc_tmr_stopped = 0; 5293 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK; 5294 if (timers & PACE_TMR_DELACK) { 5295 ret = bbr_timeout_delack(tp, bbr, cts); 5296 } else if (timers & PACE_TMR_PERSIT) { 5297 ret = bbr_timeout_persist(tp, bbr, cts); 5298 } else if (timers & PACE_TMR_RACK) { 5299 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5300 ret = bbr_timeout_rack(tp, bbr, cts); 5301 } else if (timers & PACE_TMR_TLP) { 5302 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5303 ret = bbr_timeout_tlp(tp, bbr, cts); 5304 } else if (timers & PACE_TMR_RXT) { 5305 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5306 ret = bbr_timeout_rxt(tp, bbr, cts); 5307 } else if (timers & PACE_TMR_KEEP) { 5308 ret = bbr_timeout_keepalive(tp, bbr, cts); 5309 } 5310 bbr_log_to_processing(bbr, cts, ret, timers, hpts_calling); 5311 return (ret); 5312 } 5313 5314 static void 5315 bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts) 5316 { 5317 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 5318 uint8_t hpts_removed = 0; 5319 5320 if (bbr->rc_inp->inp_in_hpts && 5321 (bbr->rc_timer_first == 1)) { 5322 /* 5323 * If we are canceling timer's when we have the 5324 * timer ahead of the output being paced. We also 5325 * must remove ourselves from the hpts. 5326 */ 5327 hpts_removed = 1; 5328 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 5329 if (bbr->r_ctl.rc_last_delay_val) { 5330 /* Update the last hptsi delay too */ 5331 uint32_t time_since_send; 5332 5333 if (TSTMP_GT(cts, bbr->rc_pacer_started)) 5334 time_since_send = cts - bbr->rc_pacer_started; 5335 else 5336 time_since_send = 0; 5337 if (bbr->r_ctl.rc_last_delay_val > time_since_send) { 5338 /* Cut down our slot time */ 5339 bbr->r_ctl.rc_last_delay_val -= time_since_send; 5340 } else { 5341 bbr->r_ctl.rc_last_delay_val = 0; 5342 } 5343 bbr->rc_pacer_started = cts; 5344 } 5345 } 5346 bbr->rc_timer_first = 0; 5347 bbr_log_to_cancel(bbr, line, cts, hpts_removed); 5348 bbr->rc_tmr_stopped = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; 5349 bbr->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK); 5350 } 5351 } 5352 5353 static void 5354 bbr_timer_stop(struct tcpcb *tp, uint32_t timer_type) 5355 { 5356 struct tcp_bbr *bbr; 5357 5358 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 5359 bbr->rc_all_timers_stopped = 1; 5360 return; 5361 } 5362 5363 /* 5364 * stop all timers always returning 0. 5365 */ 5366 static int 5367 bbr_stopall(struct tcpcb *tp) 5368 { 5369 return (0); 5370 } 5371 5372 static void 5373 bbr_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta) 5374 { 5375 return; 5376 } 5377 5378 /* 5379 * return true if a bbr timer (rack or tlp) is active. 5380 */ 5381 static int 5382 bbr_timer_active(struct tcpcb *tp, uint32_t timer_type) 5383 { 5384 return (0); 5385 } 5386 5387 static uint32_t 5388 bbr_get_earliest_send_outstanding(struct tcp_bbr *bbr, struct bbr_sendmap *u_rsm, uint32_t cts) 5389 { 5390 struct bbr_sendmap *rsm; 5391 5392 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 5393 if ((rsm == NULL) || (u_rsm == rsm)) 5394 return (cts); 5395 return(rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]); 5396 } 5397 5398 static void 5399 bbr_update_rsm(struct tcpcb *tp, struct tcp_bbr *bbr, 5400 struct bbr_sendmap *rsm, uint32_t cts, uint32_t pacing_time) 5401 { 5402 int32_t idx; 5403 5404 rsm->r_rtr_cnt++; 5405 rsm->r_dupack = 0; 5406 if (rsm->r_rtr_cnt > BBR_NUM_OF_RETRANS) { 5407 rsm->r_rtr_cnt = BBR_NUM_OF_RETRANS; 5408 rsm->r_flags |= BBR_OVERMAX; 5409 } 5410 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 5411 /* Take off the collapsed flag at rxt */ 5412 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 5413 } 5414 if (rsm->r_flags & BBR_MARKED_LOST) { 5415 /* We have retransmitted, its no longer lost */ 5416 rsm->r_flags &= ~BBR_MARKED_LOST; 5417 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 5418 } 5419 if (rsm->r_flags & BBR_RXT_CLEARED) { 5420 /* 5421 * We hit a RXT timer on it and 5422 * we cleared the "acked" flag. 5423 * We now have it going back into 5424 * flight, we can remove the cleared 5425 * flag and possibly do accounting on 5426 * this piece. 5427 */ 5428 rsm->r_flags &= ~BBR_RXT_CLEARED; 5429 } 5430 if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & BBR_TLP) == 0)) { 5431 bbr->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start); 5432 rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start); 5433 } 5434 idx = rsm->r_rtr_cnt - 1; 5435 rsm->r_tim_lastsent[idx] = cts; 5436 rsm->r_pacing_delay = pacing_time; 5437 rsm->r_delivered = bbr->r_ctl.rc_delivered; 5438 rsm->r_ts_valid = bbr->rc_ts_valid; 5439 if (bbr->rc_ts_valid) 5440 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 5441 if (bbr->r_ctl.r_app_limited_until) 5442 rsm->r_app_limited = 1; 5443 else 5444 rsm->r_app_limited = 0; 5445 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 5446 rsm->r_bbr_state = bbr_state_val(bbr); 5447 else 5448 rsm->r_bbr_state = 8; 5449 if (rsm->r_flags & BBR_ACKED) { 5450 /* Problably MTU discovery messing with us */ 5451 uint32_t old_flags; 5452 5453 old_flags = rsm->r_flags; 5454 rsm->r_flags &= ~BBR_ACKED; 5455 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 5456 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 5457 if (bbr->r_ctl.rc_sacked == 0) 5458 bbr->r_ctl.rc_sacklast = NULL; 5459 } 5460 if (rsm->r_in_tmap) { 5461 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5462 } 5463 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5464 rsm->r_in_tmap = 1; 5465 if (rsm->r_flags & BBR_SACK_PASSED) { 5466 /* We have retransmitted due to the SACK pass */ 5467 rsm->r_flags &= ~BBR_SACK_PASSED; 5468 rsm->r_flags |= BBR_WAS_SACKPASS; 5469 } 5470 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 5471 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 5472 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 5473 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 5474 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 5475 rsm->r_is_gain = 1; 5476 rsm->r_is_drain = 0; 5477 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 5478 rsm->r_is_drain = 1; 5479 rsm->r_is_gain = 0; 5480 } else { 5481 rsm->r_is_drain = 0; 5482 rsm->r_is_gain = 0; 5483 } 5484 rsm->r_del_time = bbr->r_ctl.rc_del_time; /* TEMP GOOGLE CODE */ 5485 } 5486 5487 /* 5488 * Returns 0, or the sequence where we stopped 5489 * updating. We also update the lenp to be the amount 5490 * of data left. 5491 */ 5492 5493 static uint32_t 5494 bbr_update_entry(struct tcpcb *tp, struct tcp_bbr *bbr, 5495 struct bbr_sendmap *rsm, uint32_t cts, int32_t *lenp, uint32_t pacing_time) 5496 { 5497 /* 5498 * We (re-)transmitted starting at rsm->r_start for some length 5499 * (possibly less than r_end. 5500 */ 5501 struct bbr_sendmap *nrsm; 5502 uint32_t c_end; 5503 int32_t len; 5504 5505 len = *lenp; 5506 c_end = rsm->r_start + len; 5507 if (SEQ_GEQ(c_end, rsm->r_end)) { 5508 /* 5509 * We retransmitted the whole piece or more than the whole 5510 * slopping into the next rsm. 5511 */ 5512 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5513 if (c_end == rsm->r_end) { 5514 *lenp = 0; 5515 return (0); 5516 } else { 5517 int32_t act_len; 5518 5519 /* Hangs over the end return whats left */ 5520 act_len = rsm->r_end - rsm->r_start; 5521 *lenp = (len - act_len); 5522 return (rsm->r_end); 5523 } 5524 /* We don't get out of this block. */ 5525 } 5526 /* 5527 * Here we retransmitted less than the whole thing which means we 5528 * have to split this into what was transmitted and what was not. 5529 */ 5530 nrsm = bbr_alloc_full_limit(bbr); 5531 if (nrsm == NULL) { 5532 *lenp = 0; 5533 return (0); 5534 } 5535 /* 5536 * So here we are going to take the original rsm and make it what we 5537 * retransmitted. nrsm will be the tail portion we did not 5538 * retransmit. For example say the chunk was 1, 11 (10 bytes). And 5539 * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to 5540 * 1, 6 and the new piece will be 6, 11. 5541 */ 5542 bbr_clone_rsm(bbr, nrsm, rsm, c_end); 5543 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 5544 nrsm->r_dupack = 0; 5545 if (rsm->r_in_tmap) { 5546 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 5547 nrsm->r_in_tmap = 1; 5548 } 5549 rsm->r_flags &= (~BBR_HAS_FIN); 5550 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5551 *lenp = 0; 5552 return (0); 5553 } 5554 5555 static uint64_t 5556 bbr_get_hardware_rate(struct tcp_bbr *bbr) 5557 { 5558 uint64_t bw; 5559 5560 bw = bbr_get_bw(bbr); 5561 bw *= (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]; 5562 bw /= (uint64_t)BBR_UNIT; 5563 return(bw); 5564 } 5565 5566 static void 5567 bbr_setup_less_of_rate(struct tcp_bbr *bbr, uint32_t cts, 5568 uint64_t act_rate, uint64_t rate_wanted) 5569 { 5570 /* 5571 * We could not get a full gains worth 5572 * of rate. 5573 */ 5574 if (get_filter_value(&bbr->r_ctl.rc_delrate) >= act_rate) { 5575 /* we can't even get the real rate */ 5576 uint64_t red; 5577 5578 bbr->skip_gain = 1; 5579 bbr->gain_is_limited = 0; 5580 red = get_filter_value(&bbr->r_ctl.rc_delrate) - act_rate; 5581 if (red) 5582 filter_reduce_by(&bbr->r_ctl.rc_delrate, red, cts); 5583 } else { 5584 /* We can use a lower gain */ 5585 bbr->skip_gain = 0; 5586 bbr->gain_is_limited = 1; 5587 } 5588 } 5589 5590 static void 5591 bbr_update_hardware_pacing_rate(struct tcp_bbr *bbr, uint32_t cts) 5592 { 5593 const struct tcp_hwrate_limit_table *nrte; 5594 int error, rate = -1; 5595 5596 if (bbr->r_ctl.crte == NULL) 5597 return; 5598 if ((bbr->rc_inp->inp_route.ro_rt == NULL) || 5599 (bbr->rc_inp->inp_route.ro_rt->rt_ifp == NULL)) { 5600 /* Lost our routes? */ 5601 /* Clear the way for a re-attempt */ 5602 bbr->bbr_attempt_hdwr_pace = 0; 5603 lost_rate: 5604 bbr->gain_is_limited = 0; 5605 bbr->skip_gain = 0; 5606 bbr->bbr_hdrw_pacing = 0; 5607 counter_u64_add(bbr_flows_whdwr_pacing, -1); 5608 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 5609 tcp_bbr_tso_size_check(bbr, cts); 5610 return; 5611 } 5612 rate = bbr_get_hardware_rate(bbr); 5613 nrte = tcp_chg_pacing_rate(bbr->r_ctl.crte, 5614 bbr->rc_tp, 5615 bbr->rc_inp->inp_route.ro_rt->rt_ifp, 5616 rate, 5617 (RS_PACING_GEQ|RS_PACING_SUB_OK), 5618 &error); 5619 if (nrte == NULL) { 5620 goto lost_rate; 5621 } 5622 if (nrte != bbr->r_ctl.crte) { 5623 bbr->r_ctl.crte = nrte; 5624 if (error == 0) { 5625 BBR_STAT_INC(bbr_hdwr_rl_mod_ok); 5626 if (bbr->r_ctl.crte->rate < rate) { 5627 /* We have a problem */ 5628 bbr_setup_less_of_rate(bbr, cts, 5629 bbr->r_ctl.crte->rate, rate); 5630 } else { 5631 /* We are good */ 5632 bbr->gain_is_limited = 0; 5633 bbr->skip_gain = 0; 5634 } 5635 } else { 5636 /* A failure should release the tag */ 5637 BBR_STAT_INC(bbr_hdwr_rl_mod_fail); 5638 bbr->gain_is_limited = 0; 5639 bbr->skip_gain = 0; 5640 bbr->bbr_hdrw_pacing = 0; 5641 } 5642 bbr_type_log_hdwr_pacing(bbr, 5643 bbr->r_ctl.crte->ptbl->rs_ifp, 5644 rate, 5645 ((bbr->r_ctl.crte == NULL) ? 0 : bbr->r_ctl.crte->rate), 5646 __LINE__, 5647 cts, 5648 error); 5649 } 5650 } 5651 5652 static void 5653 bbr_adjust_for_hw_pacing(struct tcp_bbr *bbr, uint32_t cts) 5654 { 5655 /* 5656 * If we have hardware pacing support 5657 * we need to factor that in for our 5658 * TSO size. 5659 */ 5660 const struct tcp_hwrate_limit_table *rlp; 5661 uint32_t cur_delay, seg_sz, maxseg, new_tso, delta, hdwr_delay; 5662 5663 if ((bbr->bbr_hdrw_pacing == 0) || 5664 (IN_RECOVERY(bbr->rc_tp->t_flags)) || 5665 (bbr->r_ctl.crte == NULL)) 5666 return; 5667 if (bbr->hw_pacing_set == 0) { 5668 /* Not yet by the hdwr pacing count delay */ 5669 return; 5670 } 5671 if (bbr_hdwr_pace_adjust == 0) { 5672 /* No adjustment */ 5673 return; 5674 } 5675 rlp = bbr->r_ctl.crte; 5676 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) 5677 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5678 else 5679 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5680 /* 5681 * So lets first get the 5682 * time we will take between 5683 * TSO sized sends currently without 5684 * hardware help. 5685 */ 5686 cur_delay = bbr_get_pacing_delay(bbr, BBR_UNIT, 5687 bbr->r_ctl.rc_pace_max_segs, cts, 1); 5688 hdwr_delay = bbr->r_ctl.rc_pace_max_segs / maxseg; 5689 hdwr_delay *= rlp->time_between; 5690 if (cur_delay > hdwr_delay) 5691 delta = cur_delay - hdwr_delay; 5692 else 5693 delta = 0; 5694 bbr_log_type_tsosize(bbr, cts, delta, cur_delay, hdwr_delay, 5695 (bbr->r_ctl.rc_pace_max_segs / maxseg), 5696 1); 5697 if (delta && 5698 (delta < (max(rlp->time_between, 5699 bbr->r_ctl.bbr_hptsi_segments_delay_tar)))) { 5700 /* 5701 * Now lets divide by the pacing 5702 * time between each segment the 5703 * hardware sends rounding up and 5704 * derive a bytes from that. We multiply 5705 * that by bbr_hdwr_pace_adjust to get 5706 * more bang for our buck. 5707 * 5708 * The goal is to have the software pacer 5709 * waiting no more than an additional 5710 * pacing delay if we can (without the 5711 * compensation i.e. x bbr_hdwr_pace_adjust). 5712 */ 5713 seg_sz = max(((cur_delay + rlp->time_between)/rlp->time_between), 5714 (bbr->r_ctl.rc_pace_max_segs/maxseg)); 5715 seg_sz *= bbr_hdwr_pace_adjust; 5716 if (bbr_hdwr_pace_floor && 5717 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5718 /* Currently hardware paces 5719 * out rs_min_seg segments at a time. 5720 * We need to make sure we always send at least 5721 * a full burst of bbr_hdwr_pace_floor down. 5722 */ 5723 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5724 } 5725 seg_sz *= maxseg; 5726 } else if (delta == 0) { 5727 /* 5728 * The highest pacing rate is 5729 * above our b/w gained. This means 5730 * we probably are going quite fast at 5731 * the hardware highest rate. Lets just multiply 5732 * the calculated TSO size by the 5733 * multiplier factor (its probably 5734 * 4 segments in the default config for 5735 * mlx). 5736 */ 5737 seg_sz = bbr->r_ctl.rc_pace_max_segs * bbr_hdwr_pace_adjust; 5738 if (bbr_hdwr_pace_floor && 5739 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5740 /* Currently hardware paces 5741 * out rs_min_seg segments at a time. 5742 * We need to make sure we always send at least 5743 * a full burst of bbr_hdwr_pace_floor down. 5744 */ 5745 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5746 } 5747 } else { 5748 /* 5749 * The pacing time difference is so 5750 * big that the hardware will 5751 * pace out more rapidly then we 5752 * really want and then we 5753 * will have a long delay. Lets just keep 5754 * the same TSO size so its as if 5755 * we were not using hdwr pacing (we 5756 * just gain a bit of spacing from the 5757 * hardware if seg_sz > 1). 5758 */ 5759 seg_sz = bbr->r_ctl.rc_pace_max_segs; 5760 } 5761 if (seg_sz > bbr->r_ctl.rc_pace_max_segs) 5762 new_tso = seg_sz; 5763 else 5764 new_tso = bbr->r_ctl.rc_pace_max_segs; 5765 if (new_tso >= (PACE_MAX_IP_BYTES-maxseg)) 5766 new_tso = PACE_MAX_IP_BYTES - maxseg; 5767 5768 if (new_tso != bbr->r_ctl.rc_pace_max_segs) { 5769 bbr_log_type_tsosize(bbr, cts, new_tso, 0, bbr->r_ctl.rc_pace_max_segs, maxseg, 0); 5770 bbr->r_ctl.rc_pace_max_segs = new_tso; 5771 } 5772 } 5773 5774 static void 5775 tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts) 5776 { 5777 uint64_t bw; 5778 uint32_t old_tso = 0, new_tso; 5779 uint32_t maxseg, bytes; 5780 uint32_t tls_seg=0; 5781 /* 5782 * Google/linux uses the following algorithm to determine 5783 * the TSO size based on the b/w of the link (from Neal Cardwell email 9/27/18): 5784 * 5785 * bytes = bw_in_bytes_per_second / 1000 5786 * bytes = min(bytes, 64k) 5787 * tso_segs = bytes / MSS 5788 * if (bw < 1.2Mbs) 5789 * min_tso_segs = 1 5790 * else 5791 * min_tso_segs = 2 5792 * tso_segs = max(tso_segs, min_tso_segs) 5793 * 5794 * * Note apply a device specific limit (we apply this in the 5795 * tcp_m_copym). 5796 * Note that before the initial measurement is made google bursts out 5797 * a full iwnd just like new-reno/cubic. 5798 * 5799 * We do not use this algorithm. Instead we 5800 * use a two phased approach: 5801 * 5802 * if ( bw <= per-tcb-cross-over) 5803 * goal_tso = calculate how much with this bw we 5804 * can send in goal-time seconds. 5805 * if (goal_tso > mss) 5806 * seg = goal_tso / mss 5807 * tso = seg * mss 5808 * else 5809 * tso = mss 5810 * if (tso > per-tcb-max) 5811 * tso = per-tcb-max 5812 * else if ( bw > 512Mbps) 5813 * tso = max-tso (64k/mss) 5814 * else 5815 * goal_tso = bw / per-tcb-divsor 5816 * seg = (goal_tso + mss-1)/mss 5817 * tso = seg * mss 5818 * 5819 * if (tso < per-tcb-floor) 5820 * tso = per-tcb-floor 5821 * if (tso > per-tcb-utter_max) 5822 * tso = per-tcb-utter_max 5823 * 5824 * Note the default per-tcb-divisor is 1000 (same as google). 5825 * the goal cross over is 30Mbps however. To recreate googles 5826 * algorithm you need to set: 5827 * 5828 * cross-over = 23,168,000 bps 5829 * goal-time = 18000 5830 * per-tcb-max = 2 5831 * per-tcb-divisor = 1000 5832 * per-tcb-floor = 1 5833 * 5834 * This will get you "google bbr" behavior with respect to tso size. 5835 * 5836 * Note we do set anything TSO size until we are past the initial 5837 * window. Before that we gnerally use either a single MSS 5838 * or we use the full IW size (so we burst a IW at a time) 5839 * Also note that Hardware-TLS is special and does alternate 5840 * things to minimize PCI Bus Bandwidth use. 5841 */ 5842 5843 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) { 5844 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5845 } else { 5846 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5847 } 5848 #ifdef KERN_TLS 5849 if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { 5850 tls_seg = ctf_get_opt_tls_size(bbr->rc_inp->inp_socket, bbr->rc_tp->snd_wnd); 5851 bbr->r_ctl.rc_pace_min_segs = (tls_seg + bbr->rc_last_options); 5852 } 5853 #endif 5854 old_tso = bbr->r_ctl.rc_pace_max_segs; 5855 if (bbr->rc_past_init_win == 0) { 5856 /* 5857 * Not enough data has been acknowledged to make a 5858 * judgement unless we are hardware TLS. Set up 5859 * the inital TSO based on if we are sending a 5860 * full IW at once or not. 5861 */ 5862 if (bbr->rc_use_google) 5863 bbr->r_ctl.rc_pace_max_segs = ((bbr->rc_tp->t_maxseg - bbr->rc_last_options) * 2); 5864 else if (bbr->bbr_init_win_cheat) 5865 bbr->r_ctl.rc_pace_max_segs = bbr_initial_cwnd(bbr, bbr->rc_tp); 5866 else 5867 bbr->r_ctl.rc_pace_max_segs = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5868 if (bbr->r_ctl.rc_pace_min_segs != bbr->rc_tp->t_maxseg) 5869 bbr->r_ctl.rc_pace_min_segs = bbr->rc_tp->t_maxseg; 5870 #ifdef KERN_TLS 5871 if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) && tls_seg) { 5872 /* 5873 * For hardware TLS we set our min to the tls_seg size. 5874 */ 5875 bbr->r_ctl.rc_pace_max_segs = tls_seg; 5876 bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options; 5877 } 5878 #endif 5879 if (bbr->r_ctl.rc_pace_max_segs == 0) { 5880 bbr->r_ctl.rc_pace_max_segs = maxseg; 5881 } 5882 bbr_log_type_tsosize(bbr, cts, bbr->r_ctl.rc_pace_max_segs, tls_seg, old_tso, maxseg, 0); 5883 #ifdef KERN_TLS 5884 if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0) 5885 #endif 5886 bbr_adjust_for_hw_pacing(bbr, cts); 5887 return; 5888 } 5889 /** 5890 * Now lets set the TSO goal based on our delivery rate in 5891 * bytes per second. Note we only do this if 5892 * we have acked at least the initial cwnd worth of data. 5893 */ 5894 bw = bbr_get_bw(bbr); 5895 if (IN_RECOVERY(bbr->rc_tp->t_flags) && 5896 (bbr->rc_use_google == 0)) { 5897 /* We clamp to one MSS in recovery */ 5898 new_tso = maxseg; 5899 } else if (bbr->rc_use_google) { 5900 int min_tso_segs; 5901 5902 /* Google considers the gain too */ 5903 if (bbr->r_ctl.rc_bbr_hptsi_gain != BBR_UNIT) { 5904 bw *= bbr->r_ctl.rc_bbr_hptsi_gain; 5905 bw /= BBR_UNIT; 5906 } 5907 bytes = bw / 1024; 5908 if (bytes > (64 * 1024)) 5909 bytes = 64 * 1024; 5910 new_tso = bytes / maxseg; 5911 if (bw < ONE_POINT_TWO_MEG) 5912 min_tso_segs = 1; 5913 else 5914 min_tso_segs = 2; 5915 if (new_tso < min_tso_segs) 5916 new_tso = min_tso_segs; 5917 new_tso *= maxseg; 5918 } else if (bbr->rc_no_pacing) { 5919 new_tso = (PACE_MAX_IP_BYTES / maxseg) * maxseg; 5920 } else if (bw <= bbr->r_ctl.bbr_cross_over) { 5921 /* 5922 * Calculate the worse case b/w TSO if we are inserting no 5923 * more than a delay_target number of TSO's. 5924 */ 5925 uint32_t tso_len, min_tso; 5926 5927 tso_len = bbr_get_pacing_length(bbr, BBR_UNIT, bbr->r_ctl.bbr_hptsi_segments_delay_tar, bw); 5928 if (tso_len > maxseg) { 5929 new_tso = tso_len / maxseg; 5930 if (new_tso > bbr->r_ctl.bbr_hptsi_segments_max) 5931 new_tso = bbr->r_ctl.bbr_hptsi_segments_max; 5932 new_tso *= maxseg; 5933 } else { 5934 /* 5935 * less than a full sized frame yikes.. long rtt or 5936 * low bw? 5937 */ 5938 min_tso = bbr_minseg(bbr); 5939 if ((tso_len > min_tso) && (bbr_all_get_min == 0)) 5940 new_tso = rounddown(tso_len, min_tso); 5941 else 5942 new_tso = min_tso; 5943 } 5944 } else if (bw > FIVETWELVE_MBPS) { 5945 /* 5946 * This guy is so fast b/w wise that we can TSO as large as 5947 * possible of segments that the NIC will allow. 5948 */ 5949 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5950 } else { 5951 /* 5952 * This formula is based on attempting to send a segment or 5953 * more every bbr_hptsi_per_second. The default is 1000 5954 * which means you are targeting what you can send every 1ms 5955 * based on the peers bw. 5956 * 5957 * If the number drops to say 500, then you are looking more 5958 * at 2ms and you will raise how much we send in a single 5959 * TSO thus saving CPU (less bbr_output_wtime() calls). The 5960 * trade off of course is you will send more at once and 5961 * thus tend to clump up the sends into larger "bursts" 5962 * building a queue. 5963 */ 5964 bw /= bbr->r_ctl.bbr_hptsi_per_second; 5965 new_tso = roundup(bw, (uint64_t)maxseg); 5966 /* 5967 * Gate the floor to match what our lower than 48Mbps 5968 * algorithm does. The ceiling (bbr_hptsi_segments_max) thus 5969 * becomes the floor for this calculation. 5970 */ 5971 if (new_tso < (bbr->r_ctl.bbr_hptsi_segments_max * maxseg)) 5972 new_tso = (bbr->r_ctl.bbr_hptsi_segments_max * maxseg); 5973 } 5974 if (bbr->r_ctl.bbr_hptsi_segments_floor && (new_tso < (maxseg * bbr->r_ctl.bbr_hptsi_segments_floor))) 5975 new_tso = maxseg * bbr->r_ctl.bbr_hptsi_segments_floor; 5976 if (new_tso > PACE_MAX_IP_BYTES) 5977 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5978 /* Enforce an utter maximum if we are not HW-TLS */ 5979 #ifdef KERN_TLS 5980 if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0) 5981 #endif 5982 if (bbr->r_ctl.bbr_utter_max && (new_tso > (bbr->r_ctl.bbr_utter_max * maxseg))) { 5983 new_tso = bbr->r_ctl.bbr_utter_max * maxseg; 5984 } 5985 #ifdef KERN_TLS 5986 if (tls_seg) { 5987 /* 5988 * Lets move the output size 5989 * up to 1 or more TLS record sizes. 5990 */ 5991 uint32_t temp; 5992 5993 temp = roundup(new_tso, tls_seg); 5994 new_tso = temp; 5995 /* Back down if needed to under a full frame */ 5996 while (new_tso > PACE_MAX_IP_BYTES) 5997 new_tso -= tls_seg; 5998 } 5999 #endif 6000 if (old_tso != new_tso) { 6001 /* Only log changes */ 6002 bbr_log_type_tsosize(bbr, cts, new_tso, tls_seg, old_tso, maxseg, 0); 6003 bbr->r_ctl.rc_pace_max_segs = new_tso; 6004 } 6005 #ifdef KERN_TLS 6006 if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) && 6007 tls_seg) { 6008 bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options; 6009 } else 6010 #endif 6011 /* We have hardware pacing and not hardware TLS! */ 6012 bbr_adjust_for_hw_pacing(bbr, cts); 6013 } 6014 6015 static void 6016 bbr_log_output(struct tcp_bbr *bbr, struct tcpcb *tp, struct tcpopt *to, int32_t len, 6017 uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t cts, 6018 struct mbuf *mb, int32_t * abandon, struct bbr_sendmap *hintrsm, uint32_t delay_calc, 6019 struct sockbuf *sb) 6020 { 6021 6022 struct bbr_sendmap *rsm, *nrsm; 6023 register uint32_t snd_max, snd_una; 6024 uint32_t pacing_time; 6025 /* 6026 * Add to the RACK log of packets in flight or retransmitted. If 6027 * there is a TS option we will use the TS echoed, if not we will 6028 * grab a TS. 6029 * 6030 * Retransmissions will increment the count and move the ts to its 6031 * proper place. Note that if options do not include TS's then we 6032 * won't be able to effectively use the ACK for an RTT on a retran. 6033 * 6034 * Notes about r_start and r_end. Lets consider a send starting at 6035 * sequence 1 for 10 bytes. In such an example the r_start would be 6036 * 1 (starting sequence) but the r_end would be r_start+len i.e. 11. 6037 * This means that r_end is actually the first sequence for the next 6038 * slot (11). 6039 * 6040 */ 6041 INP_WLOCK_ASSERT(tp->t_inpcb); 6042 if (err) { 6043 /* 6044 * We don't log errors -- we could but snd_max does not 6045 * advance in this case either. 6046 */ 6047 return; 6048 } 6049 if (th_flags & TH_RST) { 6050 /* 6051 * We don't log resets and we return immediately from 6052 * sending 6053 */ 6054 *abandon = 1; 6055 return; 6056 } 6057 snd_una = tp->snd_una; 6058 if (th_flags & (TH_SYN | TH_FIN) && (hintrsm == NULL)) { 6059 /* 6060 * The call to bbr_log_output is made before bumping 6061 * snd_max. This means we can record one extra byte on a SYN 6062 * or FIN if seq_out is adding more on and a FIN is present 6063 * (and we are not resending). 6064 */ 6065 if (th_flags & TH_SYN) 6066 len++; 6067 if (th_flags & TH_FIN) 6068 len++; 6069 } 6070 if (SEQ_LEQ((seq_out + len), snd_una)) { 6071 /* Are sending an old segment to induce an ack (keep-alive)? */ 6072 return; 6073 } 6074 if (SEQ_LT(seq_out, snd_una)) { 6075 /* huh? should we panic? */ 6076 uint32_t end; 6077 6078 end = seq_out + len; 6079 seq_out = snd_una; 6080 len = end - seq_out; 6081 } 6082 snd_max = tp->snd_max; 6083 if (len == 0) { 6084 /* We don't log zero window probes */ 6085 return; 6086 } 6087 pacing_time = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, len, cts, 1); 6088 /* First question is it a retransmission? */ 6089 if (seq_out == snd_max) { 6090 again: 6091 rsm = bbr_alloc(bbr); 6092 if (rsm == NULL) { 6093 return; 6094 } 6095 rsm->r_flags = 0; 6096 if (th_flags & TH_SYN) 6097 rsm->r_flags |= BBR_HAS_SYN; 6098 if (th_flags & TH_FIN) 6099 rsm->r_flags |= BBR_HAS_FIN; 6100 rsm->r_tim_lastsent[0] = cts; 6101 rsm->r_rtr_cnt = 1; 6102 rsm->r_rtr_bytes = 0; 6103 rsm->r_start = seq_out; 6104 rsm->r_end = rsm->r_start + len; 6105 rsm->r_dupack = 0; 6106 rsm->r_delivered = bbr->r_ctl.rc_delivered; 6107 rsm->r_pacing_delay = pacing_time; 6108 rsm->r_ts_valid = bbr->rc_ts_valid; 6109 if (bbr->rc_ts_valid) 6110 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 6111 rsm->r_del_time = bbr->r_ctl.rc_del_time; 6112 if (bbr->r_ctl.r_app_limited_until) 6113 rsm->r_app_limited = 1; 6114 else 6115 rsm->r_app_limited = 0; 6116 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 6117 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 6118 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 6119 /* 6120 * Here we must also add in this rsm since snd_max 6121 * is updated after we return from a new send. 6122 */ 6123 rsm->r_flight_at_send += len; 6124 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 6125 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 6126 rsm->r_in_tmap = 1; 6127 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 6128 rsm->r_bbr_state = bbr_state_val(bbr); 6129 else 6130 rsm->r_bbr_state = 8; 6131 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 6132 rsm->r_is_gain = 1; 6133 rsm->r_is_drain = 0; 6134 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 6135 rsm->r_is_drain = 1; 6136 rsm->r_is_gain = 0; 6137 } else { 6138 rsm->r_is_drain = 0; 6139 rsm->r_is_gain = 0; 6140 } 6141 return; 6142 } 6143 /* 6144 * If we reach here its a retransmission and we need to find it. 6145 */ 6146 more: 6147 if (hintrsm && (hintrsm->r_start == seq_out)) { 6148 rsm = hintrsm; 6149 hintrsm = NULL; 6150 } else if (bbr->r_ctl.rc_next) { 6151 /* We have a hint from a previous run */ 6152 rsm = bbr->r_ctl.rc_next; 6153 } else { 6154 /* No hints sorry */ 6155 rsm = NULL; 6156 } 6157 if ((rsm) && (rsm->r_start == seq_out)) { 6158 /* 6159 * We used rc_next or hintrsm to retransmit, hopefully the 6160 * likely case. 6161 */ 6162 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6163 if (len == 0) { 6164 return; 6165 } else { 6166 goto more; 6167 } 6168 } 6169 /* Ok it was not the last pointer go through it the hard way. */ 6170 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6171 if (rsm->r_start == seq_out) { 6172 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6173 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 6174 if (len == 0) { 6175 return; 6176 } else { 6177 continue; 6178 } 6179 } 6180 if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) { 6181 /* Transmitted within this piece */ 6182 /* 6183 * Ok we must split off the front and then let the 6184 * update do the rest 6185 */ 6186 nrsm = bbr_alloc_full_limit(bbr); 6187 if (nrsm == NULL) { 6188 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 6189 return; 6190 } 6191 /* 6192 * copy rsm to nrsm and then trim the front of rsm 6193 * to not include this part. 6194 */ 6195 bbr_clone_rsm(bbr, nrsm, rsm, seq_out); 6196 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 6197 if (rsm->r_in_tmap) { 6198 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 6199 nrsm->r_in_tmap = 1; 6200 } 6201 rsm->r_flags &= (~BBR_HAS_FIN); 6202 seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time); 6203 if (len == 0) { 6204 return; 6205 } 6206 } 6207 } 6208 /* 6209 * Hmm not found in map did they retransmit both old and on into the 6210 * new? 6211 */ 6212 if (seq_out == tp->snd_max) { 6213 goto again; 6214 } else if (SEQ_LT(seq_out, tp->snd_max)) { 6215 #ifdef BBR_INVARIANTS 6216 printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n", 6217 seq_out, len, tp->snd_una, tp->snd_max); 6218 printf("Starting Dump of all rack entries\n"); 6219 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6220 printf("rsm:%p start:%u end:%u\n", 6221 rsm, rsm->r_start, rsm->r_end); 6222 } 6223 printf("Dump complete\n"); 6224 panic("seq_out not found rack:%p tp:%p", 6225 bbr, tp); 6226 #endif 6227 } else { 6228 #ifdef BBR_INVARIANTS 6229 /* 6230 * Hmm beyond sndmax? (only if we are using the new rtt-pack 6231 * flag) 6232 */ 6233 panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p", 6234 seq_out, len, tp->snd_max, tp); 6235 #endif 6236 } 6237 } 6238 6239 static void 6240 bbr_collapse_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, int32_t rtt) 6241 { 6242 /* 6243 * Collapse timeout back the cum-ack moved. 6244 */ 6245 tp->t_rxtshift = 0; 6246 tp->t_softerror = 0; 6247 } 6248 6249 6250 static void 6251 tcp_bbr_xmit_timer(struct tcp_bbr *bbr, uint32_t rtt_usecs, uint32_t rsm_send_time, uint32_t r_start, uint32_t tsin) 6252 { 6253 bbr->rtt_valid = 1; 6254 bbr->r_ctl.cur_rtt = rtt_usecs; 6255 bbr->r_ctl.ts_in = tsin; 6256 if (rsm_send_time) 6257 bbr->r_ctl.cur_rtt_send_time = rsm_send_time; 6258 } 6259 6260 static void 6261 bbr_make_timestamp_determination(struct tcp_bbr *bbr) 6262 { 6263 /** 6264 * We have in our bbr control: 6265 * 1) The timestamp we started observing cum-acks (bbr->r_ctl.bbr_ts_check_tstmp). 6266 * 2) Our timestamp indicating when we sent that packet (bbr->r_ctl.rsm->bbr_ts_check_our_cts). 6267 * 3) The current timestamp that just came in (bbr->r_ctl.last_inbound_ts) 6268 * 4) The time that the packet that generated that ack was sent (bbr->r_ctl.cur_rtt_send_time) 6269 * 6270 * Now we can calculate the time between the sends by doing: 6271 * 6272 * delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts 6273 * 6274 * And the peer's time between receiving them by doing: 6275 * 6276 * peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp 6277 * 6278 * We want to figure out if the timestamp values are in msec, 10msec or usec. 6279 * We also may find that we can't use the timestamps if say we see 6280 * that the peer_delta indicates that though we may have taken 10ms to 6281 * pace out the data, it only saw 1ms between the two packets. This would 6282 * indicate that somewhere on the path is a batching entity that is giving 6283 * out time-slices of the actual b/w. This would mean we could not use 6284 * reliably the peers timestamps. 6285 * 6286 * We expect delta > peer_delta initially. Until we figure out the 6287 * timestamp difference which we will store in bbr->r_ctl.bbr_peer_tsratio. 6288 * If we place 1000 there then its a ms vs our usec. If we place 10000 there 6289 * then its 10ms vs our usec. If the peer is running a usec clock we would 6290 * put a 1 there. If the value is faster then ours, we will disable the 6291 * use of timestamps (though we could revist this later if we find it to be not 6292 * just an isolated one or two flows)). 6293 * 6294 * To detect the batching middle boxes we will come up with our compensation and 6295 * if with it in place, we find the peer is drastically off (by some margin) in 6296 * the smaller direction, then we will assume the worst case and disable use of timestamps. 6297 * 6298 */ 6299 uint64_t delta, peer_delta, delta_up; 6300 6301 delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts; 6302 if (delta < bbr_min_usec_delta) { 6303 /* 6304 * Have not seen a min amount of time 6305 * between our send times so we can 6306 * make a determination of the timestamp 6307 * yet. 6308 */ 6309 return; 6310 } 6311 peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp; 6312 if (peer_delta < bbr_min_peer_delta) { 6313 /* 6314 * We may have enough in the form of 6315 * our delta but the peers number 6316 * has not changed that much. It could 6317 * be its clock ratio is such that 6318 * we need more data (10ms tick) or 6319 * there may be other compression scenarios 6320 * going on. In any event we need the 6321 * spread to be larger. 6322 */ 6323 return; 6324 } 6325 /* Ok lets first see which way our delta is going */ 6326 if (peer_delta > delta) { 6327 /* Very unlikely, the peer without 6328 * compensation shows that it saw 6329 * the two sends arrive further apart 6330 * then we saw then in micro-seconds. 6331 */ 6332 if (peer_delta < (delta + ((delta * (uint64_t)1000)/ (uint64_t)bbr_delta_percent))) { 6333 /* well it looks like the peer is a micro-second clock. */ 6334 bbr->rc_ts_clock_set = 1; 6335 bbr->r_ctl.bbr_peer_tsratio = 1; 6336 } else { 6337 bbr->rc_ts_cant_be_used = 1; 6338 bbr->rc_ts_clock_set = 1; 6339 } 6340 return; 6341 } 6342 /* Ok we know that the peer_delta is smaller than our send distance */ 6343 bbr->rc_ts_clock_set = 1; 6344 /* First question is it within the percentage that they are using usec time? */ 6345 delta_up = (peer_delta * 1000) / (uint64_t)bbr_delta_percent; 6346 if ((peer_delta + delta_up) >= delta) { 6347 /* Its a usec clock */ 6348 bbr->r_ctl.bbr_peer_tsratio = 1; 6349 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6350 return; 6351 } 6352 /* Ok if not usec, what about 10usec (though unlikely)? */ 6353 delta_up = (peer_delta * 1000 * 10) / (uint64_t)bbr_delta_percent; 6354 if (((peer_delta * 10) + delta_up) >= delta) { 6355 bbr->r_ctl.bbr_peer_tsratio = 10; 6356 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6357 return; 6358 } 6359 /* And what about 100usec (though again unlikely)? */ 6360 delta_up = (peer_delta * 1000 * 100) / (uint64_t)bbr_delta_percent; 6361 if (((peer_delta * 100) + delta_up) >= delta) { 6362 bbr->r_ctl.bbr_peer_tsratio = 100; 6363 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6364 return; 6365 } 6366 /* And how about 1 msec (the most likely one)? */ 6367 delta_up = (peer_delta * 1000 * 1000) / (uint64_t)bbr_delta_percent; 6368 if (((peer_delta * 1000) + delta_up) >= delta) { 6369 bbr->r_ctl.bbr_peer_tsratio = 1000; 6370 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6371 return; 6372 } 6373 /* Ok if not msec could it be 10 msec? */ 6374 delta_up = (peer_delta * 1000 * 10000) / (uint64_t)bbr_delta_percent; 6375 if (((peer_delta * 10000) + delta_up) >= delta) { 6376 bbr->r_ctl.bbr_peer_tsratio = 10000; 6377 return; 6378 } 6379 /* If we fall down here the clock tick so slowly we can't use it */ 6380 bbr->rc_ts_cant_be_used = 1; 6381 bbr->r_ctl.bbr_peer_tsratio = 0; 6382 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6383 } 6384 6385 /* 6386 * Collect new round-trip time estimate 6387 * and update averages and current timeout. 6388 */ 6389 static void 6390 tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts) 6391 { 6392 int32_t delta; 6393 uint32_t rtt, tsin; 6394 int32_t rtt_ticks; 6395 6396 6397 if (bbr->rtt_valid == 0) 6398 /* No valid sample */ 6399 return; 6400 6401 rtt = bbr->r_ctl.cur_rtt; 6402 tsin = bbr->r_ctl.ts_in; 6403 if (bbr->rc_prtt_set_ts) { 6404 /* 6405 * We are to force feed the rttProp filter due 6406 * to an entry into PROBE_RTT. This assures 6407 * that the times are sync'd between when we 6408 * go into PROBE_RTT and the filter expiration. 6409 * 6410 * Google does not use a true filter, so they do 6411 * this implicitly since they only keep one value 6412 * and when they enter probe-rtt they update the 6413 * value to the newest rtt. 6414 */ 6415 uint32_t rtt_prop; 6416 6417 bbr->rc_prtt_set_ts = 0; 6418 rtt_prop = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 6419 if (rtt > rtt_prop) 6420 filter_increase_by_small(&bbr->r_ctl.rc_rttprop, (rtt - rtt_prop), cts); 6421 else 6422 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6423 } 6424 if (bbr->rc_ack_was_delayed) 6425 rtt += bbr->r_ctl.rc_ack_hdwr_delay; 6426 6427 if (rtt < bbr->r_ctl.rc_lowest_rtt) 6428 bbr->r_ctl.rc_lowest_rtt = rtt; 6429 bbr_log_rtt_sample(bbr, rtt, tsin); 6430 if (bbr->r_init_rtt) { 6431 /* 6432 * The initial rtt is not-trusted, nuke it and lets get 6433 * our first valid measurement in. 6434 */ 6435 bbr->r_init_rtt = 0; 6436 tp->t_srtt = 0; 6437 } 6438 if ((bbr->rc_ts_clock_set == 0) && bbr->rc_ts_valid) { 6439 /* 6440 * So we have not yet figured out 6441 * what the peers TSTMP value is 6442 * in (most likely ms). We need a 6443 * series of cum-ack's to determine 6444 * this reliably. 6445 */ 6446 if (bbr->rc_ack_is_cumack) { 6447 if (bbr->rc_ts_data_set) { 6448 /* Lets attempt to determine the timestamp granularity. */ 6449 bbr_make_timestamp_determination(bbr); 6450 } else { 6451 bbr->rc_ts_data_set = 1; 6452 bbr->r_ctl.bbr_ts_check_tstmp = bbr->r_ctl.last_inbound_ts; 6453 bbr->r_ctl.bbr_ts_check_our_cts = bbr->r_ctl.cur_rtt_send_time; 6454 } 6455 } else { 6456 /* 6457 * We have to have consecutive acks 6458 * reset any "filled" state to none. 6459 */ 6460 bbr->rc_ts_data_set = 0; 6461 } 6462 } 6463 /* Round it up */ 6464 rtt_ticks = USEC_2_TICKS((rtt + (USECS_IN_MSEC - 1))); 6465 if (rtt_ticks == 0) 6466 rtt_ticks = 1; 6467 if (tp->t_srtt != 0) { 6468 /* 6469 * srtt is stored as fixed point with 5 bits after the 6470 * binary point (i.e., scaled by 8). The following magic is 6471 * equivalent to the smoothing algorithm in rfc793 with an 6472 * alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed point). 6473 * Adjust rtt to origin 0. 6474 */ 6475 6476 delta = ((rtt_ticks - 1) << TCP_DELTA_SHIFT) 6477 - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)); 6478 6479 tp->t_srtt += delta; 6480 if (tp->t_srtt <= 0) 6481 tp->t_srtt = 1; 6482 6483 /* 6484 * We accumulate a smoothed rtt variance (actually, a 6485 * smoothed mean difference), then set the retransmit timer 6486 * to smoothed rtt + 4 times the smoothed variance. rttvar 6487 * is stored as fixed point with 4 bits after the binary 6488 * point (scaled by 16). The following is equivalent to 6489 * rfc793 smoothing with an alpha of .75 (rttvar = 6490 * rttvar*3/4 + |delta| / 4). This replaces rfc793's 6491 * wired-in beta. 6492 */ 6493 if (delta < 0) 6494 delta = -delta; 6495 delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT); 6496 tp->t_rttvar += delta; 6497 if (tp->t_rttvar <= 0) 6498 tp->t_rttvar = 1; 6499 if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar) 6500 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6501 } else { 6502 /* 6503 * No rtt measurement yet - use the unsmoothed rtt. Set the 6504 * variance to half the rtt (so our first retransmit happens 6505 * at 3*rtt). 6506 */ 6507 tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT; 6508 tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1); 6509 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6510 } 6511 TCPSTAT_INC(tcps_rttupdated); 6512 tp->t_rttupdated++; 6513 #ifdef STATS 6514 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt_ticks)); 6515 #endif 6516 /* 6517 * the retransmit should happen at rtt + 4 * rttvar. Because of the 6518 * way we do the smoothing, srtt and rttvar will each average +1/2 6519 * tick of bias. When we compute the retransmit timer, we want 1/2 6520 * tick of rounding and 1 extra tick because of +-1/2 tick 6521 * uncertainty in the firing of the timer. The bias will give us 6522 * exactly the 1.5 tick we need. But, because the bias is 6523 * statistical, we have to test that we don't drop below the minimum 6524 * feasible timer (which is 2 ticks). 6525 */ 6526 TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), 6527 max(MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), rtt_ticks + 2), 6528 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 6529 6530 /* 6531 * We received an ack for a packet that wasn't retransmitted; it is 6532 * probably safe to discard any error indications we've received 6533 * recently. This isn't quite right, but close enough for now (a 6534 * route might have failed after we sent a segment, and the return 6535 * path might not be symmetrical). 6536 */ 6537 tp->t_softerror = 0; 6538 rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 6539 if (bbr->r_ctl.bbr_smallest_srtt_this_state > rtt) 6540 bbr->r_ctl.bbr_smallest_srtt_this_state = rtt; 6541 } 6542 6543 static void 6544 bbr_earlier_retran(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, 6545 uint32_t t, uint32_t cts, int ack_type) 6546 { 6547 /* 6548 * For this RSM, we acknowledged the data from a previous 6549 * transmission, not the last one we made. This means we did a false 6550 * retransmit. 6551 */ 6552 if (rsm->r_flags & BBR_HAS_FIN) { 6553 /* 6554 * The sending of the FIN often is multiple sent when we 6555 * have everything outstanding ack'd. We ignore this case 6556 * since its over now. 6557 */ 6558 return; 6559 } 6560 if (rsm->r_flags & BBR_TLP) { 6561 /* 6562 * We expect TLP's to have this occur often 6563 */ 6564 bbr->rc_tlp_rtx_out = 0; 6565 return; 6566 } 6567 if (ack_type != BBR_CUM_ACKED) { 6568 /* 6569 * If it was not a cum-ack we 6570 * don't really know for sure since 6571 * the timestamp could be from some 6572 * other transmission. 6573 */ 6574 return; 6575 } 6576 6577 if (rsm->r_flags & BBR_WAS_SACKPASS) { 6578 /* 6579 * We retransmitted based on a sack and the earlier 6580 * retransmission ack'd it - re-ordering is occuring. 6581 */ 6582 BBR_STAT_INC(bbr_reorder_seen); 6583 bbr->r_ctl.rc_reorder_ts = cts; 6584 } 6585 /* Back down the loss count */ 6586 if (rsm->r_flags & BBR_MARKED_LOST) { 6587 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 6588 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 6589 rsm->r_flags &= ~BBR_MARKED_LOST; 6590 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 6591 /* LT sampling also needs adjustment */ 6592 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 6593 } 6594 /***** RRS HERE ************************/ 6595 /* Do we need to do this??? */ 6596 /* bbr_reset_lt_bw_sampling(bbr, cts); */ 6597 /***** RRS HERE ************************/ 6598 BBR_STAT_INC(bbr_badfr); 6599 BBR_STAT_ADD(bbr_badfr_bytes, (rsm->r_end - rsm->r_start)); 6600 } 6601 6602 6603 static void 6604 bbr_set_reduced_rtt(struct tcp_bbr *bbr, uint32_t cts, uint32_t line) 6605 { 6606 bbr->r_ctl.rc_rtt_shrinks = cts; 6607 if (bbr_can_force_probertt && 6608 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 6609 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 6610 /* 6611 * We should enter probe-rtt its been too long 6612 * since we have been there. 6613 */ 6614 bbr_enter_probe_rtt(bbr, cts, __LINE__); 6615 } else 6616 bbr_check_probe_rtt_limits(bbr, cts); 6617 } 6618 6619 static void 6620 tcp_bbr_commit_bw(struct tcp_bbr *bbr, uint32_t cts) 6621 { 6622 uint64_t orig_bw; 6623 6624 if (bbr->r_ctl.rc_bbr_cur_del_rate == 0) { 6625 /* We never apply a zero measurment */ 6626 bbr_log_type_bbrupd(bbr, 20, cts, 0, 0, 6627 0, 0, 0, 0, 0, 0); 6628 return; 6629 } 6630 if (bbr->r_ctl.r_measurement_count < 0xffffffff) 6631 bbr->r_ctl.r_measurement_count++; 6632 orig_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 6633 apply_filter_max(&bbr->r_ctl.rc_delrate, bbr->r_ctl.rc_bbr_cur_del_rate, bbr->r_ctl.rc_pkt_epoch); 6634 bbr_log_type_bbrupd(bbr, 21, cts, (uint32_t)orig_bw, 6635 (uint32_t)get_filter_value(&bbr->r_ctl.rc_delrate), 6636 0, 0, 0, 0, 0, 0); 6637 if (orig_bw && 6638 (orig_bw != get_filter_value(&bbr->r_ctl.rc_delrate))) { 6639 if (bbr->bbr_hdrw_pacing) { 6640 /* 6641 * Apply a new rate to the hardware 6642 * possibly. 6643 */ 6644 bbr_update_hardware_pacing_rate(bbr, cts); 6645 } 6646 bbr_set_state_target(bbr, __LINE__); 6647 tcp_bbr_tso_size_check(bbr, cts); 6648 if (bbr->r_recovery_bw) { 6649 bbr_setup_red_bw(bbr, cts); 6650 bbr_log_type_bw_reduce(bbr, BBR_RED_BW_USELRBW); 6651 } 6652 } else if ((orig_bw == 0) && get_filter_value(&bbr->r_ctl.rc_delrate)) 6653 tcp_bbr_tso_size_check(bbr, cts); 6654 } 6655 6656 static void 6657 bbr_nf_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6658 { 6659 if (bbr->rc_in_persist == 0) { 6660 /* We log only when not in persist */ 6661 /* Translate to a Bytes Per Second */ 6662 uint64_t tim, bw, ts_diff, ts_bw; 6663 uint32_t upper, lower, delivered; 6664 6665 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6666 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6667 else 6668 tim = 1; 6669 /* 6670 * Now that we have processed the tim (skipping the sample 6671 * or possibly updating the time, go ahead and 6672 * calculate the cdr. 6673 */ 6674 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6675 bw = (uint64_t)delivered; 6676 bw *= (uint64_t)USECS_IN_SECOND; 6677 bw /= tim; 6678 if (bw == 0) { 6679 /* We must have a calculatable amount */ 6680 return; 6681 } 6682 upper = (bw >> 32) & 0x00000000ffffffff; 6683 lower = bw & 0x00000000ffffffff; 6684 /* 6685 * If we are using this b/w shove it in now so we 6686 * can see in the trace viewer if it gets over-ridden. 6687 */ 6688 if (rsm->r_ts_valid && 6689 bbr->rc_ts_valid && 6690 bbr->rc_ts_clock_set && 6691 (bbr->rc_ts_cant_be_used == 0) && 6692 bbr->rc_use_ts_limit) { 6693 ts_diff = max((bbr->r_ctl.last_inbound_ts - rsm->r_del_ack_ts), 1); 6694 ts_diff *= bbr->r_ctl.bbr_peer_tsratio; 6695 if ((delivered == 0) || 6696 (rtt < 1000)) { 6697 /* Can't use the ts */ 6698 bbr_log_type_bbrupd(bbr, 61, cts, 6699 ts_diff, 6700 bbr->r_ctl.last_inbound_ts, 6701 rsm->r_del_ack_ts, 0, 6702 0, 0, 0, delivered); 6703 } else { 6704 ts_bw = (uint64_t)delivered; 6705 ts_bw *= (uint64_t)USECS_IN_SECOND; 6706 ts_bw /= ts_diff; 6707 bbr_log_type_bbrupd(bbr, 62, cts, 6708 (ts_bw >> 32), 6709 (ts_bw & 0xffffffff), 0, 0, 6710 0, 0, ts_diff, delivered); 6711 if ((bbr->ts_can_raise) && 6712 (ts_bw > bw)) { 6713 bbr_log_type_bbrupd(bbr, 8, cts, 6714 delivered, 6715 ts_diff, 6716 (bw >> 32), 6717 (bw & 0x00000000ffffffff), 6718 0, 0, 0, 0); 6719 bw = ts_bw; 6720 } else if (ts_bw && (ts_bw < bw)) { 6721 bbr_log_type_bbrupd(bbr, 7, cts, 6722 delivered, 6723 ts_diff, 6724 (bw >> 32), 6725 (bw & 0x00000000ffffffff), 6726 0, 0, 0, 0); 6727 bw = ts_bw; 6728 } 6729 } 6730 } 6731 if (rsm->r_first_sent_time && 6732 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6733 uint64_t sbw, sti; 6734 /* 6735 * We use what was in flight at the time of our 6736 * send and the size of this send to figure 6737 * out what we have been sending at (amount). 6738 * For the time we take from the time of 6739 * the send of the first send outstanding 6740 * until this send plus this sends pacing 6741 * time. This gives us a good calculation 6742 * as to the rate we have been sending at. 6743 */ 6744 6745 sbw = (uint64_t)(rsm->r_flight_at_send); 6746 sbw *= (uint64_t)USECS_IN_SECOND; 6747 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6748 sti += rsm->r_pacing_delay; 6749 sbw /= sti; 6750 if (sbw < bw) { 6751 bbr_log_type_bbrupd(bbr, 6, cts, 6752 delivered, 6753 (uint32_t)sti, 6754 (bw >> 32), 6755 (uint32_t)bw, 6756 rsm->r_first_sent_time, 0, (sbw >> 32), 6757 (uint32_t)sbw); 6758 bw = sbw; 6759 } 6760 } 6761 /* Use the google algorithm for b/w measurements */ 6762 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6763 if ((rsm->r_app_limited == 0) || 6764 (bw > get_filter_value(&bbr->r_ctl.rc_delrate))) { 6765 tcp_bbr_commit_bw(bbr, cts); 6766 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6767 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6768 } 6769 } 6770 } 6771 6772 static void 6773 bbr_google_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6774 { 6775 if (bbr->rc_in_persist == 0) { 6776 /* We log only when not in persist */ 6777 /* Translate to a Bytes Per Second */ 6778 uint64_t tim, bw; 6779 uint32_t upper, lower, delivered; 6780 int no_apply = 0; 6781 6782 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6783 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6784 else 6785 tim = 1; 6786 /* 6787 * Now that we have processed the tim (skipping the sample 6788 * or possibly updating the time, go ahead and 6789 * calculate the cdr. 6790 */ 6791 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6792 bw = (uint64_t)delivered; 6793 bw *= (uint64_t)USECS_IN_SECOND; 6794 bw /= tim; 6795 if (tim < bbr->r_ctl.rc_lowest_rtt) { 6796 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6797 tim, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6798 6799 no_apply = 1; 6800 } 6801 upper = (bw >> 32) & 0x00000000ffffffff; 6802 lower = bw & 0x00000000ffffffff; 6803 /* 6804 * If we are using this b/w shove it in now so we 6805 * can see in the trace viewer if it gets over-ridden. 6806 */ 6807 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6808 /* Gate by the sending rate */ 6809 if (rsm->r_first_sent_time && 6810 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6811 uint64_t sbw, sti; 6812 /* 6813 * We use what was in flight at the time of our 6814 * send and the size of this send to figure 6815 * out what we have been sending at (amount). 6816 * For the time we take from the time of 6817 * the send of the first send outstanding 6818 * until this send plus this sends pacing 6819 * time. This gives us a good calculation 6820 * as to the rate we have been sending at. 6821 */ 6822 6823 sbw = (uint64_t)(rsm->r_flight_at_send); 6824 sbw *= (uint64_t)USECS_IN_SECOND; 6825 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6826 sti += rsm->r_pacing_delay; 6827 sbw /= sti; 6828 if (sbw < bw) { 6829 bbr_log_type_bbrupd(bbr, 6, cts, 6830 delivered, 6831 (uint32_t)sti, 6832 (bw >> 32), 6833 (uint32_t)bw, 6834 rsm->r_first_sent_time, 0, (sbw >> 32), 6835 (uint32_t)sbw); 6836 bw = sbw; 6837 } 6838 if ((sti > tim) && 6839 (sti < bbr->r_ctl.rc_lowest_rtt)) { 6840 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6841 (uint32_t)sti, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6842 no_apply = 1; 6843 } else 6844 no_apply = 0; 6845 } 6846 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6847 if ((no_apply == 0) && 6848 ((rsm->r_app_limited == 0) || 6849 (bw > get_filter_value(&bbr->r_ctl.rc_delrate)))) { 6850 tcp_bbr_commit_bw(bbr, cts); 6851 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6852 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6853 } 6854 } 6855 } 6856 6857 6858 static void 6859 bbr_update_bbr_info(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts, uint32_t tsin, 6860 uint32_t uts, int32_t match, uint32_t rsm_send_time, int32_t ack_type, struct tcpopt *to) 6861 { 6862 uint64_t old_rttprop; 6863 6864 /* Update our delivery time and amount */ 6865 bbr->r_ctl.rc_delivered += (rsm->r_end - rsm->r_start); 6866 bbr->r_ctl.rc_del_time = cts; 6867 if (rtt == 0) { 6868 /* 6869 * 0 means its a retransmit, for now we don't use these for 6870 * the rest of BBR. 6871 */ 6872 return; 6873 } 6874 if ((bbr->rc_use_google == 0) && 6875 (match != BBR_RTT_BY_EXACTMATCH) && 6876 (match != BBR_RTT_BY_TIMESTAMP)){ 6877 /* 6878 * We get a lot of rtt updates, lets not pay attention to 6879 * any that are not an exact match. That way we don't have 6880 * to worry about timestamps and the whole nonsense of 6881 * unsure if its a retransmission etc (if we ever had the 6882 * timestamp fixed to always have the last thing sent this 6883 * would not be a issue). 6884 */ 6885 return; 6886 } 6887 if ((bbr_no_retran && bbr->rc_use_google) && 6888 (match != BBR_RTT_BY_EXACTMATCH) && 6889 (match != BBR_RTT_BY_TIMESTAMP)){ 6890 /* 6891 * We only do measurements in google mode 6892 * with bbr_no_retran on for sure things. 6893 */ 6894 return; 6895 } 6896 /* Only update srtt if we know by exact match */ 6897 tcp_bbr_xmit_timer(bbr, rtt, rsm_send_time, rsm->r_start, tsin); 6898 if (ack_type == BBR_CUM_ACKED) 6899 bbr->rc_ack_is_cumack = 1; 6900 else 6901 bbr->rc_ack_is_cumack = 0; 6902 old_rttprop = bbr_get_rtt(bbr, BBR_RTT_PROP); 6903 /* 6904 * Note the following code differs to the original 6905 * BBR spec. It calls for <= not <. However after a 6906 * long discussion in email with Neal, he acknowledged 6907 * that it should be < than so that we will have flows 6908 * going into probe-rtt (we were seeing cases where that 6909 * did not happen and caused ugly things to occur). We 6910 * have added this agreed upon fix to our code base. 6911 */ 6912 if (rtt < old_rttprop) { 6913 /* Update when we last saw a rtt drop */ 6914 bbr_log_rtt_shrinks(bbr, cts, 0, rtt, __LINE__, BBR_RTTS_NEWRTT, 0); 6915 bbr_set_reduced_rtt(bbr, cts, __LINE__); 6916 } 6917 bbr_log_type_bbrrttprop(bbr, rtt, (rsm ? rsm->r_end : 0), uts, cts, 6918 match, rsm->r_start, rsm->r_flags); 6919 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6920 if (old_rttprop != bbr_get_rtt(bbr, BBR_RTT_PROP)) { 6921 /* 6922 * The RTT-prop moved, reset the target (may be a 6923 * nop for some states). 6924 */ 6925 bbr_set_state_target(bbr, __LINE__); 6926 if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) 6927 bbr_log_rtt_shrinks(bbr, cts, 0, 0, 6928 __LINE__, BBR_RTTS_NEW_TARGET, 0); 6929 else if (old_rttprop < bbr_get_rtt(bbr, BBR_RTT_PROP)) 6930 /* It went up */ 6931 bbr_check_probe_rtt_limits(bbr, cts); 6932 } 6933 if ((bbr->rc_use_google == 0) && 6934 (match == BBR_RTT_BY_TIMESTAMP)) { 6935 /* 6936 * We don't do b/w update with 6937 * these since they are not really 6938 * reliable. 6939 */ 6940 return; 6941 } 6942 if (bbr->r_ctl.r_app_limited_until && 6943 (bbr->r_ctl.rc_delivered >= bbr->r_ctl.r_app_limited_until)) { 6944 /* We are no longer app-limited */ 6945 bbr->r_ctl.r_app_limited_until = 0; 6946 } 6947 if (bbr->rc_use_google) { 6948 bbr_google_measurement(bbr, rsm, rtt, cts); 6949 } else { 6950 bbr_nf_measurement(bbr, rsm, rtt, cts); 6951 } 6952 } 6953 6954 /* 6955 * Convert a timestamp that the main stack 6956 * uses (milliseconds) into one that bbr uses 6957 * (microseconds). Return that converted timestamp. 6958 */ 6959 static uint32_t 6960 bbr_ts_convert(uint32_t cts) { 6961 uint32_t sec, msec; 6962 6963 sec = cts / MS_IN_USEC; 6964 msec = cts - (MS_IN_USEC * sec); 6965 return ((sec * USECS_IN_SECOND) + (msec * MS_IN_USEC)); 6966 } 6967 6968 /* 6969 * Return 0 if we did not update the RTT time, return 6970 * 1 if we did. 6971 */ 6972 static int 6973 bbr_update_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, 6974 struct bbr_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, uint32_t th_ack) 6975 { 6976 int32_t i; 6977 uint32_t t, uts = 0; 6978 6979 if ((rsm->r_flags & BBR_ACKED) || 6980 (rsm->r_flags & BBR_WAS_RENEGED) || 6981 (rsm->r_flags & BBR_RXT_CLEARED)) { 6982 /* Already done */ 6983 return (0); 6984 } 6985 if (rsm->r_rtr_cnt == 1) { 6986 /* 6987 * Only one transmit. Hopefully the normal case. 6988 */ 6989 if (TSTMP_GT(cts, rsm->r_tim_lastsent[0])) 6990 t = cts - rsm->r_tim_lastsent[0]; 6991 else 6992 t = 1; 6993 if ((int)t <= 0) 6994 t = 1; 6995 bbr->r_ctl.rc_last_rtt = t; 6996 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 6997 BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to); 6998 return (1); 6999 } 7000 /* Convert to usecs */ 7001 if ((bbr_can_use_ts_for_rtt == 1) && 7002 (bbr->rc_use_google == 1) && 7003 (ack_type == BBR_CUM_ACKED) && 7004 (to->to_flags & TOF_TS) && 7005 (to->to_tsecr != 0)) { 7006 7007 t = tcp_tv_to_mssectick(&bbr->rc_tv) - to->to_tsecr; 7008 if (t < 1) 7009 t = 1; 7010 t *= MS_IN_USEC; 7011 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 7012 BBR_RTT_BY_TIMESTAMP, 7013 rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)], 7014 ack_type, to); 7015 return (1); 7016 } 7017 uts = bbr_ts_convert(to->to_tsecr); 7018 if ((to->to_flags & TOF_TS) && 7019 (to->to_tsecr != 0) && 7020 (ack_type == BBR_CUM_ACKED) && 7021 ((rsm->r_flags & BBR_OVERMAX) == 0)) { 7022 /* 7023 * Now which timestamp does it match? In this block the ACK 7024 * may be coming from a previous transmission. 7025 */ 7026 uint32_t fudge; 7027 7028 fudge = BBR_TIMER_FUDGE; 7029 for (i = 0; i < rsm->r_rtr_cnt; i++) { 7030 if ((SEQ_GEQ(uts, (rsm->r_tim_lastsent[i] - fudge))) && 7031 (SEQ_LEQ(uts, (rsm->r_tim_lastsent[i] + fudge)))) { 7032 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 7033 t = cts - rsm->r_tim_lastsent[i]; 7034 else 7035 t = 1; 7036 if ((int)t <= 0) 7037 t = 1; 7038 bbr->r_ctl.rc_last_rtt = t; 7039 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING, 7040 rsm->r_tim_lastsent[i], ack_type, to); 7041 if ((i + 1) < rsm->r_rtr_cnt) { 7042 /* Likely */ 7043 bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type); 7044 } else if (rsm->r_flags & BBR_TLP) { 7045 bbr->rc_tlp_rtx_out = 0; 7046 } 7047 return (1); 7048 } 7049 } 7050 /* Fall through if we can't find a matching timestamp */ 7051 } 7052 /* 7053 * Ok its a SACK block that we retransmitted. or a windows 7054 * machine without timestamps. We can tell nothing from the 7055 * time-stamp since its not there or the time the peer last 7056 * recieved a segment that moved forward its cum-ack point. 7057 * 7058 * Lets look at the last retransmit and see what we can tell 7059 * (with BBR for space we only keep 2 note we have to keep 7060 * at least 2 so the map can not be condensed more). 7061 */ 7062 i = rsm->r_rtr_cnt - 1; 7063 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 7064 t = cts - rsm->r_tim_lastsent[i]; 7065 else 7066 goto not_sure; 7067 if (t < bbr->r_ctl.rc_lowest_rtt) { 7068 /* 7069 * We retransmitted and the ack came back in less 7070 * than the smallest rtt we have observed in the 7071 * windowed rtt. We most likey did an improper 7072 * retransmit as outlined in 4.2 Step 3 point 2 in 7073 * the rack-draft. 7074 * 7075 * Use the prior transmission to update all the 7076 * information as long as there is only one prior 7077 * transmission. 7078 */ 7079 if ((rsm->r_flags & BBR_OVERMAX) == 0) { 7080 #ifdef BBR_INVARIANTS 7081 if (rsm->r_rtr_cnt == 1) 7082 panic("rsm:%p bbr:%p rsm has overmax and only 1 retranmit flags:%x?", rsm, bbr, rsm->r_flags); 7083 #endif 7084 i = rsm->r_rtr_cnt - 2; 7085 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 7086 t = cts - rsm->r_tim_lastsent[i]; 7087 else 7088 t = 1; 7089 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_EARLIER_RET, 7090 rsm->r_tim_lastsent[i], ack_type, to); 7091 bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type); 7092 } else { 7093 /* 7094 * Too many prior transmissions, just 7095 * updated BBR delivered 7096 */ 7097 not_sure: 7098 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 7099 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 7100 } 7101 } else { 7102 /* 7103 * We retransmitted it and the retransmit did the 7104 * job. 7105 */ 7106 if (rsm->r_flags & BBR_TLP) 7107 bbr->rc_tlp_rtx_out = 0; 7108 if ((rsm->r_flags & BBR_OVERMAX) == 0) 7109 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, 7110 BBR_RTT_BY_THIS_RETRAN, 0, ack_type, to); 7111 else 7112 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 7113 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 7114 return (1); 7115 } 7116 return (0); 7117 } 7118 7119 /* 7120 * Mark the SACK_PASSED flag on all entries prior to rsm send wise. 7121 */ 7122 static void 7123 bbr_log_sack_passed(struct tcpcb *tp, 7124 struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 7125 { 7126 struct bbr_sendmap *nrsm; 7127 7128 nrsm = rsm; 7129 TAILQ_FOREACH_REVERSE_FROM(nrsm, &bbr->r_ctl.rc_tmap, 7130 bbr_head, r_tnext) { 7131 if (nrsm == rsm) { 7132 /* Skip orginal segment he is acked */ 7133 continue; 7134 } 7135 if (nrsm->r_flags & BBR_ACKED) { 7136 /* Skip ack'd segments */ 7137 continue; 7138 } 7139 if (nrsm->r_flags & BBR_SACK_PASSED) { 7140 /* 7141 * We found one that is already marked 7142 * passed, we have been here before and 7143 * so all others below this are marked. 7144 */ 7145 break; 7146 } 7147 BBR_STAT_INC(bbr_sack_passed); 7148 nrsm->r_flags |= BBR_SACK_PASSED; 7149 if (((nrsm->r_flags & BBR_MARKED_LOST) == 0) && 7150 bbr_is_lost(bbr, nrsm, bbr->r_ctl.rc_rcvtime)) { 7151 bbr->r_ctl.rc_lost += nrsm->r_end - nrsm->r_start; 7152 bbr->r_ctl.rc_lost_bytes += nrsm->r_end - nrsm->r_start; 7153 nrsm->r_flags |= BBR_MARKED_LOST; 7154 } 7155 nrsm->r_flags &= ~BBR_WAS_SACKPASS; 7156 } 7157 } 7158 7159 /* 7160 * Returns the number of bytes that were 7161 * newly ack'd by sack blocks. 7162 */ 7163 static uint32_t 7164 bbr_proc_sack_blk(struct tcpcb *tp, struct tcp_bbr *bbr, struct sackblk *sack, 7165 struct tcpopt *to, struct bbr_sendmap **prsm, uint32_t cts) 7166 { 7167 int32_t times = 0; 7168 uint32_t start, end, maxseg, changed = 0; 7169 struct bbr_sendmap *rsm, *nrsm; 7170 int32_t used_ref = 1; 7171 uint8_t went_back = 0, went_fwd = 0; 7172 7173 maxseg = tp->t_maxseg - bbr->rc_last_options; 7174 start = sack->start; 7175 end = sack->end; 7176 rsm = *prsm; 7177 if (rsm == NULL) 7178 used_ref = 0; 7179 7180 /* Do we locate the block behind where we last were? */ 7181 if (rsm && SEQ_LT(start, rsm->r_start)) { 7182 went_back = 1; 7183 TAILQ_FOREACH_REVERSE_FROM(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 7184 if (SEQ_GEQ(start, rsm->r_start) && 7185 SEQ_LT(start, rsm->r_end)) { 7186 goto do_rest_ofb; 7187 } 7188 } 7189 } 7190 start_at_beginning: 7191 went_fwd = 1; 7192 /* 7193 * Ok lets locate the block where this guy is fwd from rsm (if its 7194 * set) 7195 */ 7196 TAILQ_FOREACH_FROM(rsm, &bbr->r_ctl.rc_map, r_next) { 7197 if (SEQ_GEQ(start, rsm->r_start) && 7198 SEQ_LT(start, rsm->r_end)) { 7199 break; 7200 } 7201 } 7202 do_rest_ofb: 7203 if (rsm == NULL) { 7204 /* 7205 * This happens when we get duplicate sack blocks with the 7206 * same end. For example SACK 4: 100 SACK 3: 100 The sort 7207 * will not change there location so we would just start at 7208 * the end of the first one and get lost. 7209 */ 7210 if (tp->t_flags & TF_SENTFIN) { 7211 /* 7212 * Check to see if we have not logged the FIN that 7213 * went out. 7214 */ 7215 nrsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7216 if (nrsm && (nrsm->r_end + 1) == tp->snd_max) { 7217 /* 7218 * Ok we did not get the FIN logged. 7219 */ 7220 nrsm->r_end++; 7221 rsm = nrsm; 7222 goto do_rest_ofb; 7223 } 7224 } 7225 if (times == 1) { 7226 #ifdef BBR_INVARIANTS 7227 panic("tp:%p bbr:%p sack:%p to:%p prsm:%p", 7228 tp, bbr, sack, to, prsm); 7229 #else 7230 goto out; 7231 #endif 7232 } 7233 times++; 7234 BBR_STAT_INC(bbr_sack_proc_restart); 7235 rsm = NULL; 7236 goto start_at_beginning; 7237 } 7238 /* Ok we have an ACK for some piece of rsm */ 7239 if (rsm->r_start != start) { 7240 /* 7241 * Need to split this in two pieces the before and after. 7242 */ 7243 if (bbr_sack_mergable(rsm, start, end)) 7244 nrsm = bbr_alloc_full_limit(bbr); 7245 else 7246 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7247 if (nrsm == NULL) { 7248 /* We could not allocate ignore the sack */ 7249 struct sackblk blk; 7250 7251 blk.start = start; 7252 blk.end = end; 7253 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7254 goto out; 7255 } 7256 bbr_clone_rsm(bbr, nrsm, rsm, start); 7257 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7258 if (rsm->r_in_tmap) { 7259 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7260 nrsm->r_in_tmap = 1; 7261 } 7262 rsm->r_flags &= (~BBR_HAS_FIN); 7263 rsm = nrsm; 7264 } 7265 if (SEQ_GEQ(end, rsm->r_end)) { 7266 /* 7267 * The end of this block is either beyond this guy or right 7268 * at this guy. 7269 */ 7270 if ((rsm->r_flags & BBR_ACKED) == 0) { 7271 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7272 changed += (rsm->r_end - rsm->r_start); 7273 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7274 bbr_log_sack_passed(tp, bbr, rsm); 7275 if (rsm->r_flags & BBR_MARKED_LOST) { 7276 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7277 } 7278 /* Is Reordering occuring? */ 7279 if (rsm->r_flags & BBR_SACK_PASSED) { 7280 BBR_STAT_INC(bbr_reorder_seen); 7281 bbr->r_ctl.rc_reorder_ts = cts; 7282 if (rsm->r_flags & BBR_MARKED_LOST) { 7283 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7284 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7285 /* LT sampling also needs adjustment */ 7286 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7287 } 7288 } 7289 rsm->r_flags |= BBR_ACKED; 7290 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7291 if (rsm->r_in_tmap) { 7292 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7293 rsm->r_in_tmap = 0; 7294 } 7295 } 7296 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7297 if (end == rsm->r_end) { 7298 /* This block only - done */ 7299 goto out; 7300 } 7301 /* There is more not coverend by this rsm move on */ 7302 start = rsm->r_end; 7303 nrsm = TAILQ_NEXT(rsm, r_next); 7304 rsm = nrsm; 7305 times = 0; 7306 goto do_rest_ofb; 7307 } 7308 if (rsm->r_flags & BBR_ACKED) { 7309 /* Been here done that */ 7310 goto out; 7311 } 7312 /* Ok we need to split off this one at the tail */ 7313 if (bbr_sack_mergable(rsm, start, end)) 7314 nrsm = bbr_alloc_full_limit(bbr); 7315 else 7316 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7317 if (nrsm == NULL) { 7318 /* failed XXXrrs what can we do but loose the sack info? */ 7319 struct sackblk blk; 7320 7321 blk.start = start; 7322 blk.end = end; 7323 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7324 goto out; 7325 } 7326 /* Clone it */ 7327 bbr_clone_rsm(bbr, nrsm, rsm, end); 7328 /* The sack block does not cover this guy fully */ 7329 rsm->r_flags &= (~BBR_HAS_FIN); 7330 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7331 if (rsm->r_in_tmap) { 7332 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7333 nrsm->r_in_tmap = 1; 7334 } 7335 nrsm->r_dupack = 0; 7336 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7337 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7338 changed += (rsm->r_end - rsm->r_start); 7339 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7340 bbr_log_sack_passed(tp, bbr, rsm); 7341 /* Is Reordering occuring? */ 7342 if (rsm->r_flags & BBR_MARKED_LOST) { 7343 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7344 } 7345 if (rsm->r_flags & BBR_SACK_PASSED) { 7346 BBR_STAT_INC(bbr_reorder_seen); 7347 bbr->r_ctl.rc_reorder_ts = cts; 7348 if (rsm->r_flags & BBR_MARKED_LOST) { 7349 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7350 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7351 /* LT sampling also needs adjustment */ 7352 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7353 } 7354 } 7355 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7356 rsm->r_flags |= BBR_ACKED; 7357 if (rsm->r_in_tmap) { 7358 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7359 rsm->r_in_tmap = 0; 7360 } 7361 out: 7362 if (rsm && (rsm->r_flags & BBR_ACKED)) { 7363 /* 7364 * Now can we merge this newly acked 7365 * block with either the previous or 7366 * next block? 7367 */ 7368 nrsm = TAILQ_NEXT(rsm, r_next); 7369 if (nrsm && 7370 (nrsm->r_flags & BBR_ACKED)) { 7371 /* yep this and next can be merged */ 7372 rsm = bbr_merge_rsm(bbr, rsm, nrsm); 7373 } 7374 /* Now what about the previous? */ 7375 nrsm = TAILQ_PREV(rsm, bbr_head, r_next); 7376 if (nrsm && 7377 (nrsm->r_flags & BBR_ACKED)) { 7378 /* yep the previous and this can be merged */ 7379 rsm = bbr_merge_rsm(bbr, nrsm, rsm); 7380 } 7381 } 7382 if (used_ref == 0) { 7383 BBR_STAT_INC(bbr_sack_proc_all); 7384 } else { 7385 BBR_STAT_INC(bbr_sack_proc_short); 7386 } 7387 if (went_fwd && went_back) { 7388 BBR_STAT_INC(bbr_sack_search_both); 7389 } else if (went_fwd) { 7390 BBR_STAT_INC(bbr_sack_search_fwd); 7391 } else if (went_back) { 7392 BBR_STAT_INC(bbr_sack_search_back); 7393 } 7394 /* Save off where the next seq is */ 7395 if (rsm) 7396 bbr->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next); 7397 else 7398 bbr->r_ctl.rc_sacklast = NULL; 7399 *prsm = rsm; 7400 return (changed); 7401 } 7402 7403 7404 static void inline 7405 bbr_peer_reneges(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, tcp_seq th_ack) 7406 { 7407 struct bbr_sendmap *tmap; 7408 7409 BBR_STAT_INC(bbr_reneges_seen); 7410 tmap = NULL; 7411 while (rsm && (rsm->r_flags & BBR_ACKED)) { 7412 /* Its no longer sacked, mark it so */ 7413 uint32_t oflags; 7414 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7415 #ifdef BBR_INVARIANTS 7416 if (rsm->r_in_tmap) { 7417 panic("bbr:%p rsm:%p flags:0x%x in tmap?", 7418 bbr, rsm, rsm->r_flags); 7419 } 7420 #endif 7421 oflags = rsm->r_flags; 7422 if (rsm->r_flags & BBR_MARKED_LOST) { 7423 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7424 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7425 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7426 /* LT sampling also needs adjustment */ 7427 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7428 } 7429 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS | BBR_MARKED_LOST); 7430 rsm->r_flags |= BBR_WAS_RENEGED; 7431 rsm->r_flags |= BBR_RXT_CLEARED; 7432 bbr_log_type_rsmclear(bbr, bbr->r_ctl.rc_rcvtime, rsm, oflags, __LINE__); 7433 /* Rebuild it into our tmap */ 7434 if (tmap == NULL) { 7435 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7436 tmap = rsm; 7437 } else { 7438 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, tmap, rsm, r_tnext); 7439 tmap = rsm; 7440 } 7441 tmap->r_in_tmap = 1; 7442 /* 7443 * XXXrrs Delivered? Should we do anything here? 7444 * 7445 * Of course we don't on a rxt timeout so maybe its ok that 7446 * we don't? 7447 * 7448 * For now lets not. 7449 */ 7450 rsm = TAILQ_NEXT(rsm, r_next); 7451 } 7452 /* 7453 * Now lets possibly clear the sack filter so we start recognizing 7454 * sacks that cover this area. 7455 */ 7456 sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack); 7457 } 7458 7459 static void 7460 bbr_log_syn(struct tcpcb *tp, struct tcpopt *to) 7461 { 7462 struct tcp_bbr *bbr; 7463 struct bbr_sendmap *rsm; 7464 uint32_t cts; 7465 7466 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7467 cts = bbr->r_ctl.rc_rcvtime; 7468 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7469 if (rsm && (rsm->r_flags & BBR_HAS_SYN)) { 7470 if ((rsm->r_end - rsm->r_start) <= 1) { 7471 /* Log out the SYN completely */ 7472 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7473 rsm->r_rtr_bytes = 0; 7474 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7475 if (rsm->r_in_tmap) { 7476 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7477 rsm->r_in_tmap = 0; 7478 } 7479 if (bbr->r_ctl.rc_next == rsm) { 7480 /* scoot along the marker */ 7481 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7482 } 7483 if (to != NULL) 7484 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, 0); 7485 bbr_free(bbr, rsm); 7486 } else { 7487 /* There is more (Fast open)? strip out SYN. */ 7488 rsm->r_flags &= ~BBR_HAS_SYN; 7489 rsm->r_start++; 7490 } 7491 } 7492 } 7493 7494 /* 7495 * Returns the number of bytes that were 7496 * acknowledged by SACK blocks. 7497 */ 7498 7499 static uint32_t 7500 bbr_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, 7501 uint32_t *prev_acked) 7502 { 7503 uint32_t changed, last_seq, entered_recovery = 0; 7504 struct tcp_bbr *bbr; 7505 struct bbr_sendmap *rsm; 7506 struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1]; 7507 register uint32_t th_ack; 7508 int32_t i, j, k, new_sb, num_sack_blks = 0; 7509 uint32_t cts, acked, ack_point, sack_changed = 0; 7510 uint32_t p_maxseg, maxseg, p_acked = 0; 7511 7512 INP_WLOCK_ASSERT(tp->t_inpcb); 7513 if (th->th_flags & TH_RST) { 7514 /* We don't log resets */ 7515 return (0); 7516 } 7517 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7518 cts = bbr->r_ctl.rc_rcvtime; 7519 7520 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7521 changed = 0; 7522 maxseg = tp->t_maxseg - bbr->rc_last_options; 7523 p_maxseg = min(bbr->r_ctl.rc_pace_max_segs, maxseg); 7524 th_ack = th->th_ack; 7525 if (SEQ_GT(th_ack, tp->snd_una)) { 7526 acked = th_ack - tp->snd_una; 7527 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_UPDATE, __LINE__); 7528 bbr->rc_tp->t_acktime = ticks; 7529 } else 7530 acked = 0; 7531 if (SEQ_LEQ(th_ack, tp->snd_una)) { 7532 /* Only sent here for sack processing */ 7533 goto proc_sack; 7534 } 7535 if (rsm && SEQ_GT(th_ack, rsm->r_start)) { 7536 changed = th_ack - rsm->r_start; 7537 } else if ((rsm == NULL) && ((th_ack - 1) == tp->iss)) { 7538 /* 7539 * For the SYN incoming case we will not have called 7540 * tcp_output for the sending of the SYN, so there will be 7541 * no map. All other cases should probably be a panic. 7542 */ 7543 if ((to->to_flags & TOF_TS) && (to->to_tsecr != 0)) { 7544 /* 7545 * We have a timestamp that can be used to generate 7546 * an initial RTT. 7547 */ 7548 uint32_t ts, now, rtt; 7549 7550 ts = bbr_ts_convert(to->to_tsecr); 7551 now = bbr_ts_convert(tcp_tv_to_mssectick(&bbr->rc_tv)); 7552 rtt = now - ts; 7553 if (rtt < 1) 7554 rtt = 1; 7555 bbr_log_type_bbrrttprop(bbr, rtt, 7556 tp->iss, 0, cts, 7557 BBR_RTT_BY_TIMESTAMP, tp->iss, 0); 7558 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 7559 changed = 1; 7560 bbr->r_wanted_output = 1; 7561 goto out; 7562 } 7563 goto proc_sack; 7564 } else if (rsm == NULL) { 7565 goto out; 7566 } 7567 if (changed) { 7568 /* 7569 * The ACK point is advancing to th_ack, we must drop off 7570 * the packets in the rack log and calculate any eligble 7571 * RTT's. 7572 */ 7573 bbr->r_wanted_output = 1; 7574 more: 7575 if (rsm == NULL) { 7576 7577 if (tp->t_flags & TF_SENTFIN) { 7578 /* if we send a FIN we will not hav a map */ 7579 goto proc_sack; 7580 } 7581 #ifdef BBR_INVARIANTS 7582 panic("No rack map tp:%p for th:%p state:%d bbr:%p snd_una:%u snd_max:%u chg:%d\n", 7583 tp, 7584 th, tp->t_state, bbr, 7585 tp->snd_una, tp->snd_max, changed); 7586 #endif 7587 goto proc_sack; 7588 } 7589 } 7590 if (SEQ_LT(th_ack, rsm->r_start)) { 7591 /* Huh map is missing this */ 7592 #ifdef BBR_INVARIANTS 7593 printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d bbr:%p\n", 7594 rsm->r_start, 7595 th_ack, tp->t_state, 7596 bbr->r_state, bbr); 7597 panic("th-ack is bad bbr:%p tp:%p", bbr, tp); 7598 #endif 7599 goto proc_sack; 7600 } else if (th_ack == rsm->r_start) { 7601 /* None here to ack */ 7602 goto proc_sack; 7603 } 7604 /* 7605 * Clear the dup ack counter, it will 7606 * either be freed or if there is some 7607 * remaining we need to start it at zero. 7608 */ 7609 rsm->r_dupack = 0; 7610 /* Now do we consume the whole thing? */ 7611 if (SEQ_GEQ(th_ack, rsm->r_end)) { 7612 /* Its all consumed. */ 7613 uint32_t left; 7614 7615 if (rsm->r_flags & BBR_ACKED) { 7616 /* 7617 * It was acked on the scoreboard -- remove it from 7618 * total 7619 */ 7620 p_acked += (rsm->r_end - rsm->r_start); 7621 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7622 if (bbr->r_ctl.rc_sacked == 0) 7623 bbr->r_ctl.rc_sacklast = NULL; 7624 } else { 7625 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, th_ack); 7626 if (rsm->r_flags & BBR_MARKED_LOST) { 7627 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7628 } 7629 if (rsm->r_flags & BBR_SACK_PASSED) { 7630 /* 7631 * There are acked segments ACKED on the 7632 * scoreboard further up. We are seeing 7633 * reordering. 7634 */ 7635 BBR_STAT_INC(bbr_reorder_seen); 7636 bbr->r_ctl.rc_reorder_ts = cts; 7637 if (rsm->r_flags & BBR_MARKED_LOST) { 7638 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7639 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7640 /* LT sampling also needs adjustment */ 7641 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7642 } 7643 } 7644 rsm->r_flags &= ~BBR_MARKED_LOST; 7645 } 7646 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7647 rsm->r_rtr_bytes = 0; 7648 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7649 if (rsm->r_in_tmap) { 7650 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7651 rsm->r_in_tmap = 0; 7652 } 7653 if (bbr->r_ctl.rc_next == rsm) { 7654 /* scoot along the marker */ 7655 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7656 } 7657 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7658 /* Adjust the packet counts */ 7659 left = th_ack - rsm->r_end; 7660 /* Free back to zone */ 7661 bbr_free(bbr, rsm); 7662 if (left) { 7663 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7664 goto more; 7665 } 7666 goto proc_sack; 7667 } 7668 if (rsm->r_flags & BBR_ACKED) { 7669 /* 7670 * It was acked on the scoreboard -- remove it from total 7671 * for the part being cum-acked. 7672 */ 7673 p_acked += (rsm->r_end - rsm->r_start); 7674 bbr->r_ctl.rc_sacked -= (th_ack - rsm->r_start); 7675 if (bbr->r_ctl.rc_sacked == 0) 7676 bbr->r_ctl.rc_sacklast = NULL; 7677 } else { 7678 /* 7679 * It was acked up to th_ack point for the first time 7680 */ 7681 struct bbr_sendmap lrsm; 7682 7683 memcpy(&lrsm, rsm, sizeof(struct bbr_sendmap)); 7684 lrsm.r_end = th_ack; 7685 bbr_update_rtt(tp, bbr, &lrsm, to, cts, BBR_CUM_ACKED, th_ack); 7686 } 7687 if ((rsm->r_flags & BBR_MARKED_LOST) && 7688 ((rsm->r_flags & BBR_ACKED) == 0)) { 7689 /* 7690 * It was marked lost and partly ack'd now 7691 * for the first time. We lower the rc_lost_bytes 7692 * and still leave it MARKED. 7693 */ 7694 bbr->r_ctl.rc_lost_bytes -= th_ack - rsm->r_start; 7695 } 7696 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7697 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7698 rsm->r_rtr_bytes = 0; 7699 /* adjust packet count */ 7700 rsm->r_start = th_ack; 7701 proc_sack: 7702 /* Check for reneging */ 7703 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7704 if (rsm && (rsm->r_flags & BBR_ACKED) && (th_ack == rsm->r_start)) { 7705 /* 7706 * The peer has moved snd_una up to the edge of this send, 7707 * i.e. one that it had previously acked. The only way that 7708 * can be true if the peer threw away data (space issues) 7709 * that it had previously sacked (else it would have given 7710 * us snd_una up to (rsm->r_end). We need to undo the acked 7711 * markings here. 7712 * 7713 * Note we have to look to make sure th_ack is our 7714 * rsm->r_start in case we get an old ack where th_ack is 7715 * behind snd_una. 7716 */ 7717 bbr_peer_reneges(bbr, rsm, th->th_ack); 7718 } 7719 if ((to->to_flags & TOF_SACK) == 0) { 7720 /* We are done nothing left to log */ 7721 goto out; 7722 } 7723 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7724 if (rsm) { 7725 last_seq = rsm->r_end; 7726 } else { 7727 last_seq = tp->snd_max; 7728 } 7729 /* Sack block processing */ 7730 if (SEQ_GT(th_ack, tp->snd_una)) 7731 ack_point = th_ack; 7732 else 7733 ack_point = tp->snd_una; 7734 for (i = 0; i < to->to_nsacks; i++) { 7735 bcopy((to->to_sacks + i * TCPOLEN_SACK), 7736 &sack, sizeof(sack)); 7737 sack.start = ntohl(sack.start); 7738 sack.end = ntohl(sack.end); 7739 if (SEQ_GT(sack.end, sack.start) && 7740 SEQ_GT(sack.start, ack_point) && 7741 SEQ_LT(sack.start, tp->snd_max) && 7742 SEQ_GT(sack.end, ack_point) && 7743 SEQ_LEQ(sack.end, tp->snd_max)) { 7744 if ((bbr->r_ctl.rc_num_small_maps_alloced > bbr_sack_block_limit) && 7745 (SEQ_LT(sack.end, last_seq)) && 7746 ((sack.end - sack.start) < (p_maxseg / 8))) { 7747 /* 7748 * Not the last piece and its smaller than 7749 * 1/8th of a p_maxseg. We ignore this. 7750 */ 7751 BBR_STAT_INC(bbr_runt_sacks); 7752 continue; 7753 } 7754 sack_blocks[num_sack_blks] = sack; 7755 num_sack_blks++; 7756 #ifdef NETFLIX_STATS 7757 } else if (SEQ_LEQ(sack.start, th_ack) && 7758 SEQ_LEQ(sack.end, th_ack)) { 7759 /* 7760 * Its a D-SACK block. 7761 */ 7762 tcp_record_dsack(sack.start, sack.end); 7763 #endif 7764 } 7765 } 7766 if (num_sack_blks == 0) 7767 goto out; 7768 /* 7769 * Sort the SACK blocks so we can update the rack scoreboard with 7770 * just one pass. 7771 */ 7772 new_sb = sack_filter_blks(&bbr->r_ctl.bbr_sf, sack_blocks, 7773 num_sack_blks, th->th_ack); 7774 ctf_log_sack_filter(bbr->rc_tp, new_sb, sack_blocks); 7775 BBR_STAT_ADD(bbr_sack_blocks, num_sack_blks); 7776 BBR_STAT_ADD(bbr_sack_blocks_skip, (num_sack_blks - new_sb)); 7777 num_sack_blks = new_sb; 7778 if (num_sack_blks < 2) { 7779 goto do_sack_work; 7780 } 7781 /* Sort the sacks */ 7782 for (i = 0; i < num_sack_blks; i++) { 7783 for (j = i + 1; j < num_sack_blks; j++) { 7784 if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) { 7785 sack = sack_blocks[i]; 7786 sack_blocks[i] = sack_blocks[j]; 7787 sack_blocks[j] = sack; 7788 } 7789 } 7790 } 7791 /* 7792 * Now are any of the sack block ends the same (yes some 7793 * implememtations send these)? 7794 */ 7795 again: 7796 if (num_sack_blks > 1) { 7797 for (i = 0; i < num_sack_blks; i++) { 7798 for (j = i + 1; j < num_sack_blks; j++) { 7799 if (sack_blocks[i].end == sack_blocks[j].end) { 7800 /* 7801 * Ok these two have the same end we 7802 * want the smallest end and then 7803 * throw away the larger and start 7804 * again. 7805 */ 7806 if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) { 7807 /* 7808 * The second block covers 7809 * more area use that 7810 */ 7811 sack_blocks[i].start = sack_blocks[j].start; 7812 } 7813 /* 7814 * Now collapse out the dup-sack and 7815 * lower the count 7816 */ 7817 for (k = (j + 1); k < num_sack_blks; k++) { 7818 sack_blocks[j].start = sack_blocks[k].start; 7819 sack_blocks[j].end = sack_blocks[k].end; 7820 j++; 7821 } 7822 num_sack_blks--; 7823 goto again; 7824 } 7825 } 7826 } 7827 } 7828 do_sack_work: 7829 rsm = bbr->r_ctl.rc_sacklast; 7830 for (i = 0; i < num_sack_blks; i++) { 7831 acked = bbr_proc_sack_blk(tp, bbr, &sack_blocks[i], to, &rsm, cts); 7832 if (acked) { 7833 bbr->r_wanted_output = 1; 7834 changed += acked; 7835 sack_changed += acked; 7836 } 7837 } 7838 out: 7839 *prev_acked = p_acked; 7840 if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) { 7841 /* 7842 * Ok we have a high probability that we need to go in to 7843 * recovery since we have data sack'd 7844 */ 7845 struct bbr_sendmap *rsm; 7846 7847 rsm = bbr_check_recovery_mode(tp, bbr, cts); 7848 if (rsm) { 7849 /* Enter recovery */ 7850 entered_recovery = 1; 7851 bbr->r_wanted_output = 1; 7852 /* 7853 * When we enter recovery we need to assure we send 7854 * one packet. 7855 */ 7856 if (bbr->r_ctl.rc_resend == NULL) { 7857 bbr->r_ctl.rc_resend = rsm; 7858 } 7859 } 7860 } 7861 if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) { 7862 /* 7863 * See if we need to rack-retransmit anything if so set it 7864 * up as the thing to resend assuming something else is not 7865 * already in that position. 7866 */ 7867 if (bbr->r_ctl.rc_resend == NULL) { 7868 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 7869 } 7870 } 7871 /* 7872 * We return the amount that changed via sack, this is used by the 7873 * ack-received code to augment what was changed between th_ack <-> 7874 * snd_una. 7875 */ 7876 return (sack_changed); 7877 } 7878 7879 static void 7880 bbr_strike_dupack(struct tcp_bbr *bbr) 7881 { 7882 struct bbr_sendmap *rsm; 7883 7884 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 7885 if (rsm && (rsm->r_dupack < 0xff)) { 7886 rsm->r_dupack++; 7887 if (rsm->r_dupack >= DUP_ACK_THRESHOLD) 7888 bbr->r_wanted_output = 1; 7889 } 7890 } 7891 7892 /* 7893 * Return value of 1, we do not need to call bbr_process_data(). 7894 * return value of 0, bbr_process_data can be called. 7895 * For ret_val if its 0 the TCB is locked and valid, if its non-zero 7896 * its unlocked and probably unsafe to touch the TCB. 7897 */ 7898 static int 7899 bbr_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, 7900 struct tcpcb *tp, struct tcpopt *to, 7901 uint32_t tiwin, int32_t tlen, 7902 int32_t * ofia, int32_t thflags, int32_t * ret_val) 7903 { 7904 int32_t ourfinisacked = 0; 7905 int32_t acked_amount; 7906 uint16_t nsegs; 7907 int32_t acked; 7908 uint32_t lost, sack_changed = 0; 7909 struct mbuf *mfree; 7910 struct tcp_bbr *bbr; 7911 uint32_t prev_acked = 0; 7912 7913 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7914 lost = bbr->r_ctl.rc_lost; 7915 nsegs = max(1, m->m_pkthdr.lro_nsegs); 7916 if (SEQ_GT(th->th_ack, tp->snd_max)) { 7917 ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val); 7918 bbr->r_wanted_output = 1; 7919 return (1); 7920 } 7921 if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) { 7922 /* Process the ack */ 7923 if (bbr->rc_in_persist) 7924 tp->t_rxtshift = 0; 7925 if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd)) 7926 bbr_strike_dupack(bbr); 7927 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 7928 } 7929 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, (bbr->r_ctl.rc_lost > lost)); 7930 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 7931 /* 7932 * Old ack, behind the last one rcv'd or a duplicate ack 7933 * with SACK info. 7934 */ 7935 if (th->th_ack == tp->snd_una) { 7936 bbr_ack_received(tp, bbr, th, 0, sack_changed, prev_acked, __LINE__, 0); 7937 if (bbr->r_state == TCPS_SYN_SENT) { 7938 /* 7939 * Special case on where we sent SYN. When 7940 * the SYN-ACK is processed in syn_sent 7941 * state it bumps the snd_una. This causes 7942 * us to hit here even though we did ack 1 7943 * byte. 7944 * 7945 * Go through the nothing left case so we 7946 * send data. 7947 */ 7948 goto nothing_left; 7949 } 7950 } 7951 return (0); 7952 } 7953 /* 7954 * If we reach this point, ACK is not a duplicate, i.e., it ACKs 7955 * something we sent. 7956 */ 7957 if (tp->t_flags & TF_NEEDSYN) { 7958 /* 7959 * T/TCP: Connection was half-synchronized, and our SYN has 7960 * been ACK'd (so connection is now fully synchronized). Go 7961 * to non-starred state, increment snd_una for ACK of SYN, 7962 * and check if we can do window scaling. 7963 */ 7964 tp->t_flags &= ~TF_NEEDSYN; 7965 tp->snd_una++; 7966 /* Do window scaling? */ 7967 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 7968 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 7969 tp->rcv_scale = tp->request_r_scale; 7970 /* Send window already scaled. */ 7971 } 7972 } 7973 INP_WLOCK_ASSERT(tp->t_inpcb); 7974 7975 acked = BYTES_THIS_ACK(tp, th); 7976 TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 7977 TCPSTAT_ADD(tcps_rcvackbyte, acked); 7978 7979 /* 7980 * If we just performed our first retransmit, and the ACK arrives 7981 * within our recovery window, then it was a mistake to do the 7982 * retransmit in the first place. Recover our original cwnd and 7983 * ssthresh, and proceed to transmit where we left off. 7984 */ 7985 if (tp->t_flags & TF_PREVVALID) { 7986 tp->t_flags &= ~TF_PREVVALID; 7987 if (tp->t_rxtshift == 1 && 7988 (int)(ticks - tp->t_badrxtwin) < 0) 7989 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 7990 } 7991 SOCKBUF_LOCK(&so->so_snd); 7992 acked_amount = min(acked, (int)sbavail(&so->so_snd)); 7993 tp->snd_wnd -= acked_amount; 7994 mfree = sbcut_locked(&so->so_snd, acked_amount); 7995 /* NB: sowwakeup_locked() does an implicit unlock. */ 7996 sowwakeup_locked(so); 7997 m_freem(mfree); 7998 if (SEQ_GT(th->th_ack, tp->snd_una)) { 7999 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 8000 } 8001 tp->snd_una = th->th_ack; 8002 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, (bbr->r_ctl.rc_lost - lost)); 8003 if (IN_RECOVERY(tp->t_flags)) { 8004 if (SEQ_LT(th->th_ack, tp->snd_recover) && 8005 (SEQ_LT(th->th_ack, tp->snd_max))) { 8006 tcp_bbr_partialack(tp); 8007 } else { 8008 bbr_post_recovery(tp); 8009 } 8010 } 8011 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 8012 tp->snd_recover = tp->snd_una; 8013 } 8014 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 8015 tp->snd_nxt = tp->snd_max; 8016 } 8017 if (tp->snd_una == tp->snd_max) { 8018 /* Nothing left outstanding */ 8019 nothing_left: 8020 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 8021 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 8022 bbr->rc_tp->t_acktime = 0; 8023 if ((sbused(&so->so_snd) == 0) && 8024 (tp->t_flags & TF_SENTFIN)) { 8025 ourfinisacked = 1; 8026 } 8027 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8028 if (bbr->rc_in_persist == 0) { 8029 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 8030 } 8031 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 8032 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 8033 /* 8034 * We invalidate the last ack here since we 8035 * don't want to transfer forward the time 8036 * for our sum's calculations. 8037 */ 8038 if ((tp->t_state >= TCPS_FIN_WAIT_1) && 8039 (sbavail(&so->so_snd) == 0) && 8040 (tp->t_flags2 & TF2_DROP_AF_DATA)) { 8041 /* 8042 * The socket was gone and the peer sent data, time 8043 * to reset him. 8044 */ 8045 *ret_val = 1; 8046 tp = tcp_close(tp); 8047 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); 8048 BBR_STAT_INC(bbr_dropped_af_data); 8049 return (1); 8050 } 8051 /* Set need output so persist might get set */ 8052 bbr->r_wanted_output = 1; 8053 } 8054 if (ofia) 8055 *ofia = ourfinisacked; 8056 return (0); 8057 } 8058 8059 static void 8060 bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 8061 { 8062 if (bbr->rc_in_persist == 0) { 8063 bbr_timer_cancel(bbr, __LINE__, cts); 8064 bbr->r_ctl.rc_last_delay_val = 0; 8065 tp->t_rxtshift = 0; 8066 bbr->rc_in_persist = 1; 8067 bbr->r_ctl.rc_went_idle_time = cts; 8068 /* We should be capped when rw went to 0 but just in case */ 8069 bbr_log_type_pesist(bbr, cts, 0, line, 1); 8070 /* Time freezes for the state, so do the accounting now */ 8071 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 8072 uint32_t time_in; 8073 8074 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 8075 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 8076 int32_t idx; 8077 8078 idx = bbr_state_val(bbr); 8079 counter_u64_add(bbr_state_time[(idx + 5)], time_in); 8080 } else { 8081 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 8082 } 8083 } 8084 bbr->r_ctl.rc_bbr_state_time = cts; 8085 } 8086 } 8087 8088 static void 8089 bbr_restart_after_idle(struct tcp_bbr *bbr, uint32_t cts, uint32_t idle_time) 8090 { 8091 /* 8092 * Note that if idle time does not exceed our 8093 * threshold, we do nothing continuing the state 8094 * transitions we were last walking through. 8095 */ 8096 if (idle_time >= bbr_idle_restart_threshold) { 8097 if (bbr->rc_use_idle_restart) { 8098 bbr->rc_bbr_state = BBR_STATE_IDLE_EXIT; 8099 /* 8100 * Set our target using BBR_UNIT, so 8101 * we increase at a dramatic rate but 8102 * we stop when we get the pipe 8103 * full again for our current b/w estimate. 8104 */ 8105 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 8106 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 8107 bbr_set_state_target(bbr, __LINE__); 8108 /* Now setup our gains to ramp up */ 8109 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 8110 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 8111 bbr_log_type_statechange(bbr, cts, __LINE__); 8112 } else { 8113 bbr_substate_change(bbr, cts, __LINE__, 1); 8114 } 8115 } 8116 } 8117 8118 static void 8119 bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 8120 { 8121 uint32_t idle_time; 8122 8123 if (bbr->rc_in_persist == 0) 8124 return; 8125 idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time); 8126 bbr->rc_in_persist = 0; 8127 bbr->rc_hit_state_1 = 0; 8128 tp->t_flags &= ~TF_FORCEDATA; 8129 bbr->r_ctl.rc_del_time = cts; 8130 /* 8131 * We invalidate the last ack here since we 8132 * don't want to transfer forward the time 8133 * for our sum's calculations. 8134 */ 8135 if (bbr->rc_inp->inp_in_hpts) { 8136 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 8137 bbr->rc_timer_first = 0; 8138 bbr->r_ctl.rc_hpts_flags = 0; 8139 bbr->r_ctl.rc_last_delay_val = 0; 8140 bbr->r_ctl.rc_hptsi_agg_delay = 0; 8141 bbr->r_agg_early_set = 0; 8142 bbr->r_ctl.rc_agg_early = 0; 8143 } 8144 bbr_log_type_pesist(bbr, cts, idle_time, line, 0); 8145 if (idle_time >= bbr_rtt_probe_time) { 8146 /* 8147 * This qualifies as a RTT_PROBE session since we drop the 8148 * data outstanding to nothing and waited more than 8149 * bbr_rtt_probe_time. 8150 */ 8151 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0); 8152 bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts; 8153 } 8154 tp->t_rxtshift = 0; 8155 /* 8156 * If in probeBW and we have persisted more than an RTT lets do 8157 * special handling. 8158 */ 8159 /* Force a time based epoch */ 8160 bbr_set_epoch(bbr, cts, __LINE__); 8161 /* 8162 * Setup the lost so we don't count anything against the guy 8163 * we have been stuck with during persists. 8164 */ 8165 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 8166 /* Time un-freezes for the state */ 8167 bbr->r_ctl.rc_bbr_state_time = cts; 8168 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) || 8169 (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) { 8170 /* 8171 * If we are going back to probe-bw 8172 * or probe_rtt, we may need to possibly 8173 * do a fast restart. 8174 */ 8175 bbr_restart_after_idle(bbr, cts, idle_time); 8176 } 8177 } 8178 8179 static void 8180 bbr_collapsed_window(struct tcp_bbr *bbr) 8181 { 8182 /* 8183 * Now we must walk the 8184 * send map and divide the 8185 * ones left stranded. These 8186 * guys can't cause us to abort 8187 * the connection and are really 8188 * "unsent". However if a buggy 8189 * client actually did keep some 8190 * of the data i.e. collapsed the win 8191 * and refused to ack and then opened 8192 * the win and acked that data. We would 8193 * get into an ack war, the simplier 8194 * method then of just pretending we 8195 * did not send those segments something 8196 * won't work. 8197 */ 8198 struct bbr_sendmap *rsm, *nrsm; 8199 tcp_seq max_seq; 8200 uint32_t maxseg; 8201 int can_split = 0; 8202 int fnd = 0; 8203 8204 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 8205 max_seq = bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd; 8206 bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0); 8207 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 8208 /* Find the first seq past or at maxseq */ 8209 if (rsm->r_flags & BBR_RWND_COLLAPSED) 8210 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8211 if (SEQ_GEQ(max_seq, rsm->r_start) && 8212 SEQ_GEQ(rsm->r_end, max_seq)) { 8213 fnd = 1; 8214 break; 8215 } 8216 } 8217 bbr->rc_has_collapsed = 0; 8218 if (!fnd) { 8219 /* Nothing to do strange */ 8220 return; 8221 } 8222 /* 8223 * Now can we split? 8224 * 8225 * We don't want to split if splitting 8226 * would generate too many small segments 8227 * less we let an attacker fragment our 8228 * send_map and leave us out of memory. 8229 */ 8230 if ((max_seq != rsm->r_start) && 8231 (max_seq != rsm->r_end)){ 8232 /* can we split? */ 8233 int res1, res2; 8234 8235 res1 = max_seq - rsm->r_start; 8236 res2 = rsm->r_end - max_seq; 8237 if ((res1 >= (maxseg/8)) && 8238 (res2 >= (maxseg/8))) { 8239 /* No small pieces here */ 8240 can_split = 1; 8241 } else if (bbr->r_ctl.rc_num_small_maps_alloced < bbr_sack_block_limit) { 8242 /* We are under the limit */ 8243 can_split = 1; 8244 } 8245 } 8246 /* Ok do we need to split this rsm? */ 8247 if (max_seq == rsm->r_start) { 8248 /* It's this guy no split required */ 8249 nrsm = rsm; 8250 } else if (max_seq == rsm->r_end) { 8251 /* It's the next one no split required. */ 8252 nrsm = TAILQ_NEXT(rsm, r_next); 8253 if (nrsm == NULL) { 8254 /* Huh? */ 8255 return; 8256 } 8257 } else if (can_split && SEQ_LT(max_seq, rsm->r_end)) { 8258 /* yep we need to split it */ 8259 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 8260 if (nrsm == NULL) { 8261 /* failed XXXrrs what can we do mark the whole? */ 8262 nrsm = rsm; 8263 goto no_split; 8264 } 8265 /* Clone it */ 8266 bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0); 8267 bbr_clone_rsm(bbr, nrsm, rsm, max_seq); 8268 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 8269 if (rsm->r_in_tmap) { 8270 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 8271 nrsm->r_in_tmap = 1; 8272 } 8273 } else { 8274 /* 8275 * Split not allowed just start here just 8276 * use this guy. 8277 */ 8278 nrsm = rsm; 8279 } 8280 no_split: 8281 BBR_STAT_INC(bbr_collapsed_win); 8282 /* reuse fnd as a count */ 8283 fnd = 0; 8284 TAILQ_FOREACH_FROM(nrsm, &bbr->r_ctl.rc_map, r_next) { 8285 nrsm->r_flags |= BBR_RWND_COLLAPSED; 8286 fnd++; 8287 bbr->rc_has_collapsed = 1; 8288 } 8289 bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd); 8290 } 8291 8292 static void 8293 bbr_un_collapse_window(struct tcp_bbr *bbr) 8294 { 8295 struct bbr_sendmap *rsm; 8296 int cleared = 0; 8297 8298 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 8299 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 8300 /* Clear the flag */ 8301 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8302 cleared++; 8303 } else 8304 break; 8305 } 8306 bbr_log_type_rwnd_collapse(bbr, 8307 (bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd), 0, cleared); 8308 bbr->rc_has_collapsed = 0; 8309 } 8310 8311 /* 8312 * Return value of 1, the TCB is unlocked and most 8313 * likely gone, return value of 0, the TCB is still 8314 * locked. 8315 */ 8316 static int 8317 bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, 8318 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, 8319 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 8320 { 8321 /* 8322 * Update window information. Don't look at window if no ACK: TAC's 8323 * send garbage on first SYN. 8324 */ 8325 uint16_t nsegs; 8326 int32_t tfo_syn; 8327 struct tcp_bbr *bbr; 8328 8329 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8330 INP_WLOCK_ASSERT(tp->t_inpcb); 8331 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8332 if ((thflags & TH_ACK) && 8333 (SEQ_LT(tp->snd_wl1, th->th_seq) || 8334 (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) || 8335 (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) { 8336 /* keep track of pure window updates */ 8337 if (tlen == 0 && 8338 tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd) 8339 TCPSTAT_INC(tcps_rcvwinupd); 8340 tp->snd_wnd = tiwin; 8341 tp->snd_wl1 = th->th_seq; 8342 tp->snd_wl2 = th->th_ack; 8343 if (tp->snd_wnd > tp->max_sndwnd) 8344 tp->max_sndwnd = tp->snd_wnd; 8345 bbr->r_wanted_output = 1; 8346 } else if (thflags & TH_ACK) { 8347 if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) { 8348 tp->snd_wnd = tiwin; 8349 tp->snd_wl1 = th->th_seq; 8350 tp->snd_wl2 = th->th_ack; 8351 } 8352 } 8353 if (tp->snd_wnd < ctf_outstanding(tp)) 8354 /* The peer collapsed its window on us */ 8355 bbr_collapsed_window(bbr); 8356 else if (bbr->rc_has_collapsed) 8357 bbr_un_collapse_window(bbr); 8358 /* Was persist timer active and now we have window space? */ 8359 if ((bbr->rc_in_persist != 0) && 8360 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8361 bbr_minseg(bbr)))) { 8362 /* 8363 * Make the rate persist at end of persist mode if idle long 8364 * enough 8365 */ 8366 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8367 8368 /* Make sure we output to start the timer */ 8369 bbr->r_wanted_output = 1; 8370 } 8371 /* Do we need to enter persist? */ 8372 if ((bbr->rc_in_persist == 0) && 8373 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8374 TCPS_HAVEESTABLISHED(tp->t_state) && 8375 (tp->snd_max == tp->snd_una) && 8376 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8377 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8378 /* No send window.. we must enter persist */ 8379 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8380 } 8381 if (tp->t_flags2 & TF2_DROP_AF_DATA) { 8382 m_freem(m); 8383 return (0); 8384 } 8385 /* 8386 * Process segments with URG. 8387 */ 8388 if ((thflags & TH_URG) && th->th_urp && 8389 TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8390 /* 8391 * This is a kludge, but if we receive and accept random 8392 * urgent pointers, we'll crash in soreceive. It's hard to 8393 * imagine someone actually wanting to send this much urgent 8394 * data. 8395 */ 8396 SOCKBUF_LOCK(&so->so_rcv); 8397 if (th->th_urp + sbavail(&so->so_rcv) > sb_max) { 8398 th->th_urp = 0; /* XXX */ 8399 thflags &= ~TH_URG; /* XXX */ 8400 SOCKBUF_UNLOCK(&so->so_rcv); /* XXX */ 8401 goto dodata; /* XXX */ 8402 } 8403 /* 8404 * If this segment advances the known urgent pointer, then 8405 * mark the data stream. This should not happen in 8406 * CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since a 8407 * FIN has been received from the remote side. In these 8408 * states we ignore the URG. 8409 * 8410 * According to RFC961 (Assigned Protocols), the urgent 8411 * pointer points to the last octet of urgent data. We 8412 * continue, however, to consider it to indicate the first 8413 * octet of data past the urgent section as the original 8414 * spec states (in one of two places). 8415 */ 8416 if (SEQ_GT(th->th_seq + th->th_urp, tp->rcv_up)) { 8417 tp->rcv_up = th->th_seq + th->th_urp; 8418 so->so_oobmark = sbavail(&so->so_rcv) + 8419 (tp->rcv_up - tp->rcv_nxt) - 1; 8420 if (so->so_oobmark == 0) 8421 so->so_rcv.sb_state |= SBS_RCVATMARK; 8422 sohasoutofband(so); 8423 tp->t_oobflags &= ~(TCPOOB_HAVEDATA | TCPOOB_HADDATA); 8424 } 8425 SOCKBUF_UNLOCK(&so->so_rcv); 8426 /* 8427 * Remove out of band data so doesn't get presented to user. 8428 * This can happen independent of advancing the URG pointer, 8429 * but if two URG's are pending at once, some out-of-band 8430 * data may creep in... ick. 8431 */ 8432 if (th->th_urp <= (uint32_t)tlen && 8433 !(so->so_options & SO_OOBINLINE)) { 8434 /* hdr drop is delayed */ 8435 tcp_pulloutofband(so, th, m, drop_hdrlen); 8436 } 8437 } else { 8438 /* 8439 * If no out of band data is expected, pull receive urgent 8440 * pointer along with the receive window. 8441 */ 8442 if (SEQ_GT(tp->rcv_nxt, tp->rcv_up)) 8443 tp->rcv_up = tp->rcv_nxt; 8444 } 8445 dodata: /* XXX */ 8446 INP_WLOCK_ASSERT(tp->t_inpcb); 8447 8448 /* 8449 * Process the segment text, merging it into the TCP sequencing 8450 * queue, and arranging for acknowledgment of receipt if necessary. 8451 * This process logically involves adjusting tp->rcv_wnd as data is 8452 * presented to the user (this happens in tcp_usrreq.c, case 8453 * PRU_RCVD). If a FIN has already been received on this connection 8454 * then we just ignore the text. 8455 */ 8456 tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) && 8457 IS_FASTOPEN(tp->t_flags)); 8458 if ((tlen || (thflags & TH_FIN) || tfo_syn) && 8459 TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8460 tcp_seq save_start = th->th_seq; 8461 tcp_seq save_rnxt = tp->rcv_nxt; 8462 int save_tlen = tlen; 8463 8464 m_adj(m, drop_hdrlen); /* delayed header drop */ 8465 /* 8466 * Insert segment which includes th into TCP reassembly 8467 * queue with control block tp. Set thflags to whether 8468 * reassembly now includes a segment with FIN. This handles 8469 * the common case inline (segment is the next to be 8470 * received on an established connection, and the queue is 8471 * empty), avoiding linkage into and removal from the queue 8472 * and repetition of various conversions. Set DELACK for 8473 * segments received in order, but ack immediately when 8474 * segments are out of order (so fast retransmit can work). 8475 */ 8476 if (th->th_seq == tp->rcv_nxt && 8477 SEGQ_EMPTY(tp) && 8478 (TCPS_HAVEESTABLISHED(tp->t_state) || 8479 tfo_syn)) { 8480 #ifdef NETFLIX_SB_LIMITS 8481 u_int mcnt, appended; 8482 8483 if (so->so_rcv.sb_shlim) { 8484 mcnt = m_memcnt(m); 8485 appended = 0; 8486 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8487 CFO_NOSLEEP, NULL) == false) { 8488 counter_u64_add(tcp_sb_shlim_fails, 1); 8489 m_freem(m); 8490 return (0); 8491 } 8492 } 8493 8494 #endif 8495 if (DELAY_ACK(tp, bbr, nsegs) || tfo_syn) { 8496 bbr->bbr_segs_rcvd += max(1, nsegs); 8497 tp->t_flags |= TF_DELACK; 8498 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8499 } else { 8500 bbr->r_wanted_output = 1; 8501 tp->t_flags |= TF_ACKNOW; 8502 } 8503 tp->rcv_nxt += tlen; 8504 thflags = th->th_flags & TH_FIN; 8505 TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8506 TCPSTAT_ADD(tcps_rcvbyte, tlen); 8507 SOCKBUF_LOCK(&so->so_rcv); 8508 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) 8509 m_freem(m); 8510 else 8511 #ifdef NETFLIX_SB_LIMITS 8512 appended = 8513 #endif 8514 sbappendstream_locked(&so->so_rcv, m, 0); 8515 /* NB: sorwakeup_locked() does an implicit unlock. */ 8516 sorwakeup_locked(so); 8517 #ifdef NETFLIX_SB_LIMITS 8518 if (so->so_rcv.sb_shlim && appended != mcnt) 8519 counter_fo_release(so->so_rcv.sb_shlim, 8520 mcnt - appended); 8521 #endif 8522 } else { 8523 /* 8524 * XXX: Due to the header drop above "th" is 8525 * theoretically invalid by now. Fortunately 8526 * m_adj() doesn't actually frees any mbufs when 8527 * trimming from the head. 8528 */ 8529 tcp_seq temp = save_start; 8530 thflags = tcp_reass(tp, th, &temp, &tlen, m); 8531 tp->t_flags |= TF_ACKNOW; 8532 } 8533 if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { 8534 if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { 8535 /* 8536 * DSACK actually handled in the fastpath 8537 * above. 8538 */ 8539 tcp_update_sack_list(tp, save_start, 8540 save_start + save_tlen); 8541 } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { 8542 if ((tp->rcv_numsacks >= 1) && 8543 (tp->sackblks[0].end == save_start)) { 8544 /* 8545 * Partial overlap, recorded at todrop 8546 * above. 8547 */ 8548 tcp_update_sack_list(tp, 8549 tp->sackblks[0].start, 8550 tp->sackblks[0].end); 8551 } else { 8552 tcp_update_dsack_list(tp, save_start, 8553 save_start + save_tlen); 8554 } 8555 } else if (tlen >= save_tlen) { 8556 /* Update of sackblks. */ 8557 tcp_update_dsack_list(tp, save_start, 8558 save_start + save_tlen); 8559 } else if (tlen > 0) { 8560 tcp_update_dsack_list(tp, save_start, 8561 save_start + tlen); 8562 } 8563 } 8564 } else { 8565 m_freem(m); 8566 thflags &= ~TH_FIN; 8567 } 8568 8569 /* 8570 * If FIN is received ACK the FIN and let the user know that the 8571 * connection is closing. 8572 */ 8573 if (thflags & TH_FIN) { 8574 if (TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8575 socantrcvmore(so); 8576 /* 8577 * If connection is half-synchronized (ie NEEDSYN 8578 * flag on) then delay ACK, so it may be piggybacked 8579 * when SYN is sent. Otherwise, since we received a 8580 * FIN then no more input can be expected, send ACK 8581 * now. 8582 */ 8583 if (tp->t_flags & TF_NEEDSYN) { 8584 tp->t_flags |= TF_DELACK; 8585 bbr_timer_cancel(bbr, 8586 __LINE__, bbr->r_ctl.rc_rcvtime); 8587 } else { 8588 tp->t_flags |= TF_ACKNOW; 8589 } 8590 tp->rcv_nxt++; 8591 } 8592 switch (tp->t_state) { 8593 8594 /* 8595 * In SYN_RECEIVED and ESTABLISHED STATES enter the 8596 * CLOSE_WAIT state. 8597 */ 8598 case TCPS_SYN_RECEIVED: 8599 tp->t_starttime = ticks; 8600 /* FALLTHROUGH */ 8601 case TCPS_ESTABLISHED: 8602 tcp_state_change(tp, TCPS_CLOSE_WAIT); 8603 break; 8604 8605 /* 8606 * If still in FIN_WAIT_1 STATE FIN has not been 8607 * acked so enter the CLOSING state. 8608 */ 8609 case TCPS_FIN_WAIT_1: 8610 tcp_state_change(tp, TCPS_CLOSING); 8611 break; 8612 8613 /* 8614 * In FIN_WAIT_2 state enter the TIME_WAIT state, 8615 * starting the time-wait timer, turning off the 8616 * other standard timers. 8617 */ 8618 case TCPS_FIN_WAIT_2: 8619 bbr->rc_timer_first = 1; 8620 bbr_timer_cancel(bbr, 8621 __LINE__, bbr->r_ctl.rc_rcvtime); 8622 INP_WLOCK_ASSERT(tp->t_inpcb); 8623 tcp_twstart(tp); 8624 return (1); 8625 } 8626 } 8627 /* 8628 * Return any desired output. 8629 */ 8630 if ((tp->t_flags & TF_ACKNOW) || 8631 (sbavail(&so->so_snd) > ctf_outstanding(tp))) { 8632 bbr->r_wanted_output = 1; 8633 } 8634 INP_WLOCK_ASSERT(tp->t_inpcb); 8635 return (0); 8636 } 8637 8638 /* 8639 * Here nothing is really faster, its just that we 8640 * have broken out the fast-data path also just like 8641 * the fast-ack. Return 1 if we processed the packet 8642 * return 0 if you need to take the "slow-path". 8643 */ 8644 static int 8645 bbr_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, 8646 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8647 uint32_t tiwin, int32_t nxt_pkt) 8648 { 8649 uint16_t nsegs; 8650 int32_t newsize = 0; /* automatic sockbuf scaling */ 8651 struct tcp_bbr *bbr; 8652 #ifdef NETFLIX_SB_LIMITS 8653 u_int mcnt, appended; 8654 #endif 8655 #ifdef TCPDEBUG 8656 /* 8657 * The size of tcp_saveipgen must be the size of the max ip header, 8658 * now IPv6. 8659 */ 8660 u_char tcp_saveipgen[IP6_HDR_LEN]; 8661 struct tcphdr tcp_savetcp; 8662 short ostate = 0; 8663 8664 #endif 8665 /* On the hpts and we would have called output */ 8666 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8667 8668 /* 8669 * If last ACK falls within this segment's sequence numbers, record 8670 * the timestamp. NOTE that the test is modified according to the 8671 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8672 */ 8673 if (bbr->r_ctl.rc_resend != NULL) { 8674 return (0); 8675 } 8676 if (tiwin && tiwin != tp->snd_wnd) { 8677 return (0); 8678 } 8679 if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) { 8680 return (0); 8681 } 8682 if (__predict_false((to->to_flags & TOF_TS) && 8683 (TSTMP_LT(to->to_tsval, tp->ts_recent)))) { 8684 return (0); 8685 } 8686 if (__predict_false((th->th_ack != tp->snd_una))) { 8687 return (0); 8688 } 8689 if (__predict_false(tlen > sbspace(&so->so_rcv))) { 8690 return (0); 8691 } 8692 if ((to->to_flags & TOF_TS) != 0 && 8693 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8694 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 8695 tp->ts_recent = to->to_tsval; 8696 } 8697 /* 8698 * This is a pure, in-sequence data packet with nothing on the 8699 * reassembly queue and we have enough buffer space to take it. 8700 */ 8701 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8702 8703 #ifdef NETFLIX_SB_LIMITS 8704 if (so->so_rcv.sb_shlim) { 8705 mcnt = m_memcnt(m); 8706 appended = 0; 8707 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8708 CFO_NOSLEEP, NULL) == false) { 8709 counter_u64_add(tcp_sb_shlim_fails, 1); 8710 m_freem(m); 8711 return (1); 8712 } 8713 } 8714 #endif 8715 /* Clean receiver SACK report if present */ 8716 if (tp->rcv_numsacks) 8717 tcp_clean_sackreport(tp); 8718 TCPSTAT_INC(tcps_preddat); 8719 tp->rcv_nxt += tlen; 8720 /* 8721 * Pull snd_wl1 up to prevent seq wrap relative to th_seq. 8722 */ 8723 tp->snd_wl1 = th->th_seq; 8724 /* 8725 * Pull rcv_up up to prevent seq wrap relative to rcv_nxt. 8726 */ 8727 tp->rcv_up = tp->rcv_nxt; 8728 TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8729 TCPSTAT_ADD(tcps_rcvbyte, tlen); 8730 #ifdef TCPDEBUG 8731 if (so->so_options & SO_DEBUG) 8732 tcp_trace(TA_INPUT, ostate, tp, 8733 (void *)tcp_saveipgen, &tcp_savetcp, 0); 8734 #endif 8735 newsize = tcp_autorcvbuf(m, th, so, tp, tlen); 8736 8737 /* Add data to socket buffer. */ 8738 SOCKBUF_LOCK(&so->so_rcv); 8739 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 8740 m_freem(m); 8741 } else { 8742 /* 8743 * Set new socket buffer size. Give up when limit is 8744 * reached. 8745 */ 8746 if (newsize) 8747 if (!sbreserve_locked(&so->so_rcv, 8748 newsize, so, NULL)) 8749 so->so_rcv.sb_flags &= ~SB_AUTOSIZE; 8750 m_adj(m, drop_hdrlen); /* delayed header drop */ 8751 8752 #ifdef NETFLIX_SB_LIMITS 8753 appended = 8754 #endif 8755 sbappendstream_locked(&so->so_rcv, m, 0); 8756 ctf_calc_rwin(so, tp); 8757 } 8758 /* NB: sorwakeup_locked() does an implicit unlock. */ 8759 sorwakeup_locked(so); 8760 #ifdef NETFLIX_SB_LIMITS 8761 if (so->so_rcv.sb_shlim && mcnt != appended) 8762 counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended); 8763 #endif 8764 if (DELAY_ACK(tp, bbr, nsegs)) { 8765 bbr->bbr_segs_rcvd += max(1, nsegs); 8766 tp->t_flags |= TF_DELACK; 8767 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8768 } else { 8769 bbr->r_wanted_output = 1; 8770 tp->t_flags |= TF_ACKNOW; 8771 } 8772 return (1); 8773 } 8774 8775 /* 8776 * This subfunction is used to try to highly optimize the 8777 * fast path. We again allow window updates that are 8778 * in sequence to remain in the fast-path. We also add 8779 * in the __predict's to attempt to help the compiler. 8780 * Note that if we return a 0, then we can *not* process 8781 * it and the caller should push the packet into the 8782 * slow-path. If we return 1, then all is well and 8783 * the packet is fully processed. 8784 */ 8785 static int 8786 bbr_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 8787 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8788 uint32_t tiwin, int32_t nxt_pkt) 8789 { 8790 int32_t acked; 8791 uint16_t nsegs; 8792 uint32_t sack_changed; 8793 #ifdef TCPDEBUG 8794 /* 8795 * The size of tcp_saveipgen must be the size of the max ip header, 8796 * now IPv6. 8797 */ 8798 u_char tcp_saveipgen[IP6_HDR_LEN]; 8799 struct tcphdr tcp_savetcp; 8800 short ostate = 0; 8801 8802 #endif 8803 uint32_t prev_acked = 0; 8804 struct tcp_bbr *bbr; 8805 8806 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 8807 /* Old ack, behind (or duplicate to) the last one rcv'd */ 8808 return (0); 8809 } 8810 if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) { 8811 /* Above what we have sent? */ 8812 return (0); 8813 } 8814 if (__predict_false(tiwin == 0)) { 8815 /* zero window */ 8816 return (0); 8817 } 8818 if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) { 8819 /* We need a SYN or a FIN, unlikely.. */ 8820 return (0); 8821 } 8822 if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) { 8823 /* Timestamp is behind .. old ack with seq wrap? */ 8824 return (0); 8825 } 8826 if (__predict_false(IN_RECOVERY(tp->t_flags))) { 8827 /* Still recovering */ 8828 return (0); 8829 } 8830 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8831 if (__predict_false(bbr->r_ctl.rc_resend != NULL)) { 8832 /* We are retransmitting */ 8833 return (0); 8834 } 8835 if (__predict_false(bbr->rc_in_persist != 0)) { 8836 /* In persist mode */ 8837 return (0); 8838 } 8839 if (bbr->r_ctl.rc_sacked) { 8840 /* We have sack holes on our scoreboard */ 8841 return (0); 8842 } 8843 /* Ok if we reach here, we can process a fast-ack */ 8844 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8845 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 8846 /* 8847 * We never detect loss in fast ack [we can't 8848 * have a sack and can't be in recovery so 8849 * we always pass 0 (nothing detected)]. 8850 */ 8851 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, 0); 8852 /* Did the window get updated? */ 8853 if (tiwin != tp->snd_wnd) { 8854 tp->snd_wnd = tiwin; 8855 tp->snd_wl1 = th->th_seq; 8856 if (tp->snd_wnd > tp->max_sndwnd) 8857 tp->max_sndwnd = tp->snd_wnd; 8858 } 8859 /* Do we need to exit persists? */ 8860 if ((bbr->rc_in_persist != 0) && 8861 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8862 bbr_minseg(bbr)))) { 8863 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8864 bbr->r_wanted_output = 1; 8865 } 8866 /* Do we need to enter persists? */ 8867 if ((bbr->rc_in_persist == 0) && 8868 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8869 TCPS_HAVEESTABLISHED(tp->t_state) && 8870 (tp->snd_max == tp->snd_una) && 8871 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8872 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8873 /* No send window.. we must enter persist */ 8874 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8875 } 8876 /* 8877 * If last ACK falls within this segment's sequence numbers, record 8878 * the timestamp. NOTE that the test is modified according to the 8879 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8880 */ 8881 if ((to->to_flags & TOF_TS) != 0 && 8882 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8883 tp->ts_recent_age = bbr->r_ctl.rc_rcvtime; 8884 tp->ts_recent = to->to_tsval; 8885 } 8886 /* 8887 * This is a pure ack for outstanding data. 8888 */ 8889 TCPSTAT_INC(tcps_predack); 8890 8891 /* 8892 * "bad retransmit" recovery. 8893 */ 8894 if (tp->t_flags & TF_PREVVALID) { 8895 tp->t_flags &= ~TF_PREVVALID; 8896 if (tp->t_rxtshift == 1 && 8897 (int)(ticks - tp->t_badrxtwin) < 0) 8898 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 8899 } 8900 /* 8901 * Recalculate the transmit timer / rtt. 8902 * 8903 * Some boxes send broken timestamp replies during the SYN+ACK 8904 * phase, ignore timestamps of 0 or we could calculate a huge RTT 8905 * and blow up the retransmit timer. 8906 */ 8907 acked = BYTES_THIS_ACK(tp, th); 8908 8909 #ifdef TCP_HHOOK 8910 /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */ 8911 hhook_run_tcp_est_in(tp, th, to); 8912 #endif 8913 8914 TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 8915 TCPSTAT_ADD(tcps_rcvackbyte, acked); 8916 sbdrop(&so->so_snd, acked); 8917 8918 if (SEQ_GT(th->th_ack, tp->snd_una)) 8919 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 8920 tp->snd_una = th->th_ack; 8921 if (tp->snd_wnd < ctf_outstanding(tp)) 8922 /* The peer collapsed its window on us */ 8923 bbr_collapsed_window(bbr); 8924 else if (bbr->rc_has_collapsed) 8925 bbr_un_collapse_window(bbr); 8926 8927 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 8928 tp->snd_recover = tp->snd_una; 8929 } 8930 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, 0); 8931 /* 8932 * Pull snd_wl2 up to prevent seq wrap relative to th_ack. 8933 */ 8934 tp->snd_wl2 = th->th_ack; 8935 m_freem(m); 8936 /* 8937 * If all outstanding data are acked, stop retransmit timer, 8938 * otherwise restart timer using current (possibly backed-off) 8939 * value. If process is waiting for space, wakeup/selwakeup/signal. 8940 * If data are ready to send, let tcp_output decide between more 8941 * output or persist. 8942 */ 8943 #ifdef TCPDEBUG 8944 if (so->so_options & SO_DEBUG) 8945 tcp_trace(TA_INPUT, ostate, tp, 8946 (void *)tcp_saveipgen, 8947 &tcp_savetcp, 0); 8948 #endif 8949 /* Wake up the socket if we have room to write more */ 8950 sowwakeup(so); 8951 if (tp->snd_una == tp->snd_max) { 8952 /* Nothing left outstanding */ 8953 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 8954 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 8955 bbr->rc_tp->t_acktime = 0; 8956 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8957 if (bbr->rc_in_persist == 0) { 8958 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 8959 } 8960 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 8961 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 8962 /* 8963 * We invalidate the last ack here since we 8964 * don't want to transfer forward the time 8965 * for our sum's calculations. 8966 */ 8967 bbr->r_wanted_output = 1; 8968 } 8969 if (sbavail(&so->so_snd)) { 8970 bbr->r_wanted_output = 1; 8971 } 8972 return (1); 8973 } 8974 8975 /* 8976 * Return value of 1, the TCB is unlocked and most 8977 * likely gone, return value of 0, the TCB is still 8978 * locked. 8979 */ 8980 static int 8981 bbr_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, 8982 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8983 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 8984 { 8985 int32_t todrop; 8986 int32_t ourfinisacked = 0; 8987 struct tcp_bbr *bbr; 8988 int32_t ret_val = 0; 8989 8990 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8991 ctf_calc_rwin(so, tp); 8992 /* 8993 * If the state is SYN_SENT: if seg contains an ACK, but not for our 8994 * SYN, drop the input. if seg contains a RST, then drop the 8995 * connection. if seg does not contain SYN, then drop it. Otherwise 8996 * this is an acceptable SYN segment initialize tp->rcv_nxt and 8997 * tp->irs if seg contains ack then advance tp->snd_una. BRR does 8998 * not support ECN so we will not say we are capable. if SYN has 8999 * been acked change to ESTABLISHED else SYN_RCVD state arrange for 9000 * segment to be acked (eventually) continue processing rest of 9001 * data/controls, beginning with URG 9002 */ 9003 if ((thflags & TH_ACK) && 9004 (SEQ_LEQ(th->th_ack, tp->iss) || 9005 SEQ_GT(th->th_ack, tp->snd_max))) { 9006 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9007 return (1); 9008 } 9009 if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) { 9010 TCP_PROBE5(connect__refused, NULL, tp, 9011 mtod(m, const char *), tp, th); 9012 tp = tcp_drop(tp, ECONNREFUSED); 9013 ctf_do_drop(m, tp); 9014 return (1); 9015 } 9016 if (thflags & TH_RST) { 9017 ctf_do_drop(m, tp); 9018 return (1); 9019 } 9020 if (!(thflags & TH_SYN)) { 9021 ctf_do_drop(m, tp); 9022 return (1); 9023 } 9024 tp->irs = th->th_seq; 9025 tcp_rcvseqinit(tp); 9026 if (thflags & TH_ACK) { 9027 int tfo_partial = 0; 9028 9029 TCPSTAT_INC(tcps_connects); 9030 soisconnected(so); 9031 #ifdef MAC 9032 mac_socketpeer_set_from_mbuf(m, so); 9033 #endif 9034 /* Do window scaling on this connection? */ 9035 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 9036 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 9037 tp->rcv_scale = tp->request_r_scale; 9038 } 9039 tp->rcv_adv += min(tp->rcv_wnd, 9040 TCP_MAXWIN << tp->rcv_scale); 9041 /* 9042 * If not all the data that was sent in the TFO SYN 9043 * has been acked, resend the remainder right away. 9044 */ 9045 if (IS_FASTOPEN(tp->t_flags) && 9046 (tp->snd_una != tp->snd_max)) { 9047 tp->snd_nxt = th->th_ack; 9048 tfo_partial = 1; 9049 } 9050 /* 9051 * If there's data, delay ACK; if there's also a FIN ACKNOW 9052 * will be turned on later. 9053 */ 9054 if (DELAY_ACK(tp, bbr, 1) && tlen != 0 && (tfo_partial == 0)) { 9055 bbr->bbr_segs_rcvd += 1; 9056 tp->t_flags |= TF_DELACK; 9057 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 9058 } else { 9059 bbr->r_wanted_output = 1; 9060 tp->t_flags |= TF_ACKNOW; 9061 } 9062 if (SEQ_GT(th->th_ack, tp->iss)) { 9063 /* 9064 * The SYN is acked 9065 * handle it specially. 9066 */ 9067 bbr_log_syn(tp, to); 9068 } 9069 if (SEQ_GT(th->th_ack, tp->snd_una)) { 9070 /* 9071 * We advance snd_una for the 9072 * fast open case. If th_ack is 9073 * acknowledging data beyond 9074 * snd_una we can't just call 9075 * ack-processing since the 9076 * data stream in our send-map 9077 * will start at snd_una + 1 (one 9078 * beyond the SYN). If its just 9079 * equal we don't need to do that 9080 * and there is no send_map. 9081 */ 9082 tp->snd_una++; 9083 } 9084 /* 9085 * Received <SYN,ACK> in SYN_SENT[*] state. Transitions: 9086 * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1 9087 */ 9088 tp->t_starttime = ticks; 9089 if (tp->t_flags & TF_NEEDFIN) { 9090 tcp_state_change(tp, TCPS_FIN_WAIT_1); 9091 tp->t_flags &= ~TF_NEEDFIN; 9092 thflags &= ~TH_SYN; 9093 } else { 9094 tcp_state_change(tp, TCPS_ESTABLISHED); 9095 TCP_PROBE5(connect__established, NULL, tp, 9096 mtod(m, const char *), tp, th); 9097 cc_conn_init(tp); 9098 } 9099 } else { 9100 /* 9101 * Received initial SYN in SYN-SENT[*] state => simultaneous 9102 * open. If segment contains CC option and there is a 9103 * cached CC, apply TAO test. If it succeeds, connection is * 9104 * half-synchronized. Otherwise, do 3-way handshake: 9105 * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If 9106 * there was no CC option, clear cached CC value. 9107 */ 9108 tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN); 9109 tcp_state_change(tp, TCPS_SYN_RECEIVED); 9110 } 9111 INP_WLOCK_ASSERT(tp->t_inpcb); 9112 /* 9113 * Advance th->th_seq to correspond to first data byte. If data, 9114 * trim to stay within window, dropping FIN if necessary. 9115 */ 9116 th->th_seq++; 9117 if (tlen > tp->rcv_wnd) { 9118 todrop = tlen - tp->rcv_wnd; 9119 m_adj(m, -todrop); 9120 tlen = tp->rcv_wnd; 9121 thflags &= ~TH_FIN; 9122 TCPSTAT_INC(tcps_rcvpackafterwin); 9123 TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop); 9124 } 9125 tp->snd_wl1 = th->th_seq - 1; 9126 tp->rcv_up = th->th_seq; 9127 /* 9128 * Client side of transaction: already sent SYN and data. If the 9129 * remote host used T/TCP to validate the SYN, our data will be 9130 * ACK'd; if so, enter normal data segment processing in the middle 9131 * of step 5, ack processing. Otherwise, goto step 6. 9132 */ 9133 if (thflags & TH_ACK) { 9134 if ((to->to_flags & TOF_TS) != 0) { 9135 uint32_t t, rtt; 9136 9137 t = tcp_tv_to_mssectick(&bbr->rc_tv); 9138 if (TSTMP_GEQ(t, to->to_tsecr)) { 9139 rtt = t - to->to_tsecr; 9140 if (rtt == 0) { 9141 rtt = 1; 9142 } 9143 rtt *= MS_IN_USEC; 9144 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 9145 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, 9146 rtt, bbr->r_ctl.rc_rcvtime); 9147 } 9148 } 9149 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) 9150 return (ret_val); 9151 /* We may have changed to FIN_WAIT_1 above */ 9152 if (tp->t_state == TCPS_FIN_WAIT_1) { 9153 /* 9154 * In FIN_WAIT_1 STATE in addition to the processing 9155 * for the ESTABLISHED state if our FIN is now 9156 * acknowledged then enter FIN_WAIT_2. 9157 */ 9158 if (ourfinisacked) { 9159 /* 9160 * If we can't receive any more data, then 9161 * closing user can proceed. Starting the 9162 * timer is contrary to the specification, 9163 * but if we don't get a FIN we'll hang 9164 * forever. 9165 * 9166 * XXXjl: we should release the tp also, and 9167 * use a compressed state. 9168 */ 9169 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9170 soisdisconnected(so); 9171 tcp_timer_activate(tp, TT_2MSL, 9172 (tcp_fast_finwait2_recycle ? 9173 tcp_finwait2_timeout : 9174 TP_MAXIDLE(tp))); 9175 } 9176 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9177 } 9178 } 9179 } 9180 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9181 tiwin, thflags, nxt_pkt)); 9182 } 9183 9184 /* 9185 * Return value of 1, the TCB is unlocked and most 9186 * likely gone, return value of 0, the TCB is still 9187 * locked. 9188 */ 9189 static int 9190 bbr_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, 9191 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9192 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9193 { 9194 int32_t ourfinisacked = 0; 9195 int32_t ret_val; 9196 struct tcp_bbr *bbr; 9197 9198 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9199 ctf_calc_rwin(so, tp); 9200 if ((thflags & TH_ACK) && 9201 (SEQ_LEQ(th->th_ack, tp->snd_una) || 9202 SEQ_GT(th->th_ack, tp->snd_max))) { 9203 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9204 return (1); 9205 } 9206 if (IS_FASTOPEN(tp->t_flags)) { 9207 /* 9208 * When a TFO connection is in SYN_RECEIVED, the only valid 9209 * packets are the initial SYN, a retransmit/copy of the 9210 * initial SYN (possibly with a subset of the original 9211 * data), a valid ACK, a FIN, or a RST. 9212 */ 9213 if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) { 9214 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9215 return (1); 9216 } else if (thflags & TH_SYN) { 9217 /* non-initial SYN is ignored */ 9218 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RXT) || 9219 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_TLP) || 9220 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) { 9221 ctf_do_drop(m, NULL); 9222 return (0); 9223 } 9224 } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) { 9225 ctf_do_drop(m, NULL); 9226 return (0); 9227 } 9228 } 9229 if ((thflags & TH_RST) || 9230 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9231 return (ctf_process_rst(m, th, so, tp)); 9232 /* 9233 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9234 * it's less than ts_recent, drop it. 9235 */ 9236 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9237 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9238 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9239 return (ret_val); 9240 } 9241 /* 9242 * In the SYN-RECEIVED state, validate that the packet belongs to 9243 * this connection before trimming the data to fit the receive 9244 * window. Check the sequence number versus IRS since we know the 9245 * sequence numbers haven't wrapped. This is a partial fix for the 9246 * "LAND" DoS attack. 9247 */ 9248 if (SEQ_LT(th->th_seq, tp->irs)) { 9249 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9250 return (1); 9251 } 9252 INP_WLOCK_ASSERT(tp->t_inpcb); 9253 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9254 return (ret_val); 9255 } 9256 /* 9257 * If last ACK falls within this segment's sequence numbers, record 9258 * its timestamp. NOTE: 1) That the test incorporates suggestions 9259 * from the latest proposal of the tcplw@cray.com list (Braden 9260 * 1993/04/26). 2) That updating only on newer timestamps interferes 9261 * with our earlier PAWS tests, so this check should be solely 9262 * predicated on the sequence space of this segment. 3) That we 9263 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9264 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9265 * SEG.Len, This modified check allows us to overcome RFC1323's 9266 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9267 * p.869. In such cases, we can still calculate the RTT correctly 9268 * when RCV.NXT == Last.ACK.Sent. 9269 */ 9270 if ((to->to_flags & TOF_TS) != 0 && 9271 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9272 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9273 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9274 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9275 tp->ts_recent = to->to_tsval; 9276 } 9277 tp->snd_wnd = tiwin; 9278 /* 9279 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9280 * is on (half-synchronized state), then queue data for later 9281 * processing; else drop segment and return. 9282 */ 9283 if ((thflags & TH_ACK) == 0) { 9284 if (IS_FASTOPEN(tp->t_flags)) { 9285 cc_conn_init(tp); 9286 } 9287 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9288 tiwin, thflags, nxt_pkt)); 9289 } 9290 TCPSTAT_INC(tcps_connects); 9291 soisconnected(so); 9292 /* Do window scaling? */ 9293 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 9294 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 9295 tp->rcv_scale = tp->request_r_scale; 9296 } 9297 /* 9298 * ok for the first time in lets see if we can use the ts to figure 9299 * out what the initial RTT was. 9300 */ 9301 if ((to->to_flags & TOF_TS) != 0) { 9302 uint32_t t, rtt; 9303 9304 t = tcp_tv_to_mssectick(&bbr->rc_tv); 9305 if (TSTMP_GEQ(t, to->to_tsecr)) { 9306 rtt = t - to->to_tsecr; 9307 if (rtt == 0) { 9308 rtt = 1; 9309 } 9310 rtt *= MS_IN_USEC; 9311 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 9312 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, bbr->r_ctl.rc_rcvtime); 9313 } 9314 } 9315 /* Drop off any SYN in the send map (probably not there) */ 9316 if (thflags & TH_ACK) 9317 bbr_log_syn(tp, to); 9318 if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) { 9319 9320 tcp_fastopen_decrement_counter(tp->t_tfo_pending); 9321 tp->t_tfo_pending = NULL; 9322 /* 9323 * Account for the ACK of our SYN prior to regular 9324 * ACK processing below. 9325 */ 9326 tp->snd_una++; 9327 } 9328 /* 9329 * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* -> 9330 * FIN-WAIT-1 9331 */ 9332 tp->t_starttime = ticks; 9333 if (tp->t_flags & TF_NEEDFIN) { 9334 tcp_state_change(tp, TCPS_FIN_WAIT_1); 9335 tp->t_flags &= ~TF_NEEDFIN; 9336 } else { 9337 tcp_state_change(tp, TCPS_ESTABLISHED); 9338 TCP_PROBE5(accept__established, NULL, tp, 9339 mtod(m, const char *), tp, th); 9340 /* 9341 * TFO connections call cc_conn_init() during SYN 9342 * processing. Calling it again here for such connections 9343 * is not harmless as it would undo the snd_cwnd reduction 9344 * that occurs when a TFO SYN|ACK is retransmitted. 9345 */ 9346 if (!IS_FASTOPEN(tp->t_flags)) 9347 cc_conn_init(tp); 9348 } 9349 /* 9350 * If segment contains data or ACK, will call tcp_reass() later; if 9351 * not, do so now to pass queued data to user. 9352 */ 9353 if (tlen == 0 && (thflags & TH_FIN) == 0) 9354 (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0, 9355 (struct mbuf *)0); 9356 tp->snd_wl1 = th->th_seq - 1; 9357 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9358 return (ret_val); 9359 } 9360 if (tp->t_state == TCPS_FIN_WAIT_1) { 9361 /* We could have went to FIN_WAIT_1 (or EST) above */ 9362 /* 9363 * In FIN_WAIT_1 STATE in addition to the processing for the 9364 * ESTABLISHED state if our FIN is now acknowledged then 9365 * enter FIN_WAIT_2. 9366 */ 9367 if (ourfinisacked) { 9368 /* 9369 * If we can't receive any more data, then closing 9370 * user can proceed. Starting the timer is contrary 9371 * to the specification, but if we don't get a FIN 9372 * we'll hang forever. 9373 * 9374 * XXXjl: we should release the tp also, and use a 9375 * compressed state. 9376 */ 9377 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9378 soisdisconnected(so); 9379 tcp_timer_activate(tp, TT_2MSL, 9380 (tcp_fast_finwait2_recycle ? 9381 tcp_finwait2_timeout : 9382 TP_MAXIDLE(tp))); 9383 } 9384 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9385 } 9386 } 9387 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9388 tiwin, thflags, nxt_pkt)); 9389 } 9390 9391 /* 9392 * Return value of 1, the TCB is unlocked and most 9393 * likely gone, return value of 0, the TCB is still 9394 * locked. 9395 */ 9396 static int 9397 bbr_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, 9398 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9399 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9400 { 9401 struct tcp_bbr *bbr; 9402 int32_t ret_val; 9403 9404 /* 9405 * Header prediction: check for the two common cases of a 9406 * uni-directional data xfer. If the packet has no control flags, 9407 * is in-sequence, the window didn't change and we're not 9408 * retransmitting, it's a candidate. If the length is zero and the 9409 * ack moved forward, we're the sender side of the xfer. Just free 9410 * the data acked & wake any higher level process that was blocked 9411 * waiting for space. If the length is non-zero and the ack didn't 9412 * move, we're the receiver side. If we're getting packets in-order 9413 * (the reassembly queue is empty), add the data toc The socket 9414 * buffer and note that we need a delayed ack. Make sure that the 9415 * hidden state-flags are also off. Since we check for 9416 * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN. 9417 */ 9418 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9419 if (bbr->r_ctl.rc_delivered < (4 * tp->t_maxseg)) { 9420 /* 9421 * If we have delived under 4 segments increase the initial 9422 * window if raised by the peer. We use this to determine 9423 * dynamic and static rwnd's at the end of a connection. 9424 */ 9425 bbr->r_ctl.rc_init_rwnd = max(tiwin, tp->snd_wnd); 9426 } 9427 if (__predict_true(((to->to_flags & TOF_SACK) == 0)) && 9428 __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_URG | TH_ACK)) == TH_ACK) && 9429 __predict_true(SEGQ_EMPTY(tp)) && 9430 __predict_true(th->th_seq == tp->rcv_nxt)) { 9431 if (tlen == 0) { 9432 if (bbr_fastack(m, th, so, tp, to, drop_hdrlen, tlen, 9433 tiwin, nxt_pkt)) { 9434 return (0); 9435 } 9436 } else { 9437 if (bbr_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen, 9438 tiwin, nxt_pkt)) { 9439 return (0); 9440 } 9441 } 9442 } 9443 ctf_calc_rwin(so, tp); 9444 9445 if ((thflags & TH_RST) || 9446 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9447 return (ctf_process_rst(m, th, so, tp)); 9448 /* 9449 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9450 * synchronized state. 9451 */ 9452 if (thflags & TH_SYN) { 9453 ctf_challenge_ack(m, th, tp, &ret_val); 9454 return (ret_val); 9455 } 9456 /* 9457 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9458 * it's less than ts_recent, drop it. 9459 */ 9460 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9461 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9462 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9463 return (ret_val); 9464 } 9465 INP_WLOCK_ASSERT(tp->t_inpcb); 9466 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9467 return (ret_val); 9468 } 9469 /* 9470 * If last ACK falls within this segment's sequence numbers, record 9471 * its timestamp. NOTE: 1) That the test incorporates suggestions 9472 * from the latest proposal of the tcplw@cray.com list (Braden 9473 * 1993/04/26). 2) That updating only on newer timestamps interferes 9474 * with our earlier PAWS tests, so this check should be solely 9475 * predicated on the sequence space of this segment. 3) That we 9476 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9477 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9478 * SEG.Len, This modified check allows us to overcome RFC1323's 9479 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9480 * p.869. In such cases, we can still calculate the RTT correctly 9481 * when RCV.NXT == Last.ACK.Sent. 9482 */ 9483 if ((to->to_flags & TOF_TS) != 0 && 9484 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9485 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9486 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9487 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9488 tp->ts_recent = to->to_tsval; 9489 } 9490 /* 9491 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9492 * is on (half-synchronized state), then queue data for later 9493 * processing; else drop segment and return. 9494 */ 9495 if ((thflags & TH_ACK) == 0) { 9496 if (tp->t_flags & TF_NEEDSYN) { 9497 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9498 tiwin, thflags, nxt_pkt)); 9499 } else if (tp->t_flags & TF_ACKNOW) { 9500 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9501 bbr->r_wanted_output = 1; 9502 return (ret_val); 9503 } else { 9504 ctf_do_drop(m, NULL); 9505 return (0); 9506 } 9507 } 9508 /* 9509 * Ack processing. 9510 */ 9511 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9512 return (ret_val); 9513 } 9514 if (sbavail(&so->so_snd)) { 9515 if (bbr_progress_timeout_check(bbr)) { 9516 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9517 return (1); 9518 } 9519 } 9520 /* State changes only happen in bbr_process_data() */ 9521 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9522 tiwin, thflags, nxt_pkt)); 9523 } 9524 9525 /* 9526 * Return value of 1, the TCB is unlocked and most 9527 * likely gone, return value of 0, the TCB is still 9528 * locked. 9529 */ 9530 static int 9531 bbr_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, 9532 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9533 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9534 { 9535 struct tcp_bbr *bbr; 9536 int32_t ret_val; 9537 9538 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9539 ctf_calc_rwin(so, tp); 9540 if ((thflags & TH_RST) || 9541 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9542 return (ctf_process_rst(m, th, so, tp)); 9543 /* 9544 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9545 * synchronized state. 9546 */ 9547 if (thflags & TH_SYN) { 9548 ctf_challenge_ack(m, th, tp, &ret_val); 9549 return (ret_val); 9550 } 9551 /* 9552 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9553 * it's less than ts_recent, drop it. 9554 */ 9555 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9556 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9557 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9558 return (ret_val); 9559 } 9560 INP_WLOCK_ASSERT(tp->t_inpcb); 9561 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9562 return (ret_val); 9563 } 9564 /* 9565 * If last ACK falls within this segment's sequence numbers, record 9566 * its timestamp. NOTE: 1) That the test incorporates suggestions 9567 * from the latest proposal of the tcplw@cray.com list (Braden 9568 * 1993/04/26). 2) That updating only on newer timestamps interferes 9569 * with our earlier PAWS tests, so this check should be solely 9570 * predicated on the sequence space of this segment. 3) That we 9571 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9572 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9573 * SEG.Len, This modified check allows us to overcome RFC1323's 9574 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9575 * p.869. In such cases, we can still calculate the RTT correctly 9576 * when RCV.NXT == Last.ACK.Sent. 9577 */ 9578 if ((to->to_flags & TOF_TS) != 0 && 9579 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9580 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9581 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9582 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9583 tp->ts_recent = to->to_tsval; 9584 } 9585 /* 9586 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9587 * is on (half-synchronized state), then queue data for later 9588 * processing; else drop segment and return. 9589 */ 9590 if ((thflags & TH_ACK) == 0) { 9591 if (tp->t_flags & TF_NEEDSYN) { 9592 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9593 tiwin, thflags, nxt_pkt)); 9594 } else if (tp->t_flags & TF_ACKNOW) { 9595 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9596 bbr->r_wanted_output = 1; 9597 return (ret_val); 9598 } else { 9599 ctf_do_drop(m, NULL); 9600 return (0); 9601 } 9602 } 9603 /* 9604 * Ack processing. 9605 */ 9606 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9607 return (ret_val); 9608 } 9609 if (sbavail(&so->so_snd)) { 9610 if (bbr_progress_timeout_check(bbr)) { 9611 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9612 return (1); 9613 } 9614 } 9615 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9616 tiwin, thflags, nxt_pkt)); 9617 } 9618 9619 static int 9620 bbr_check_data_after_close(struct mbuf *m, struct tcp_bbr *bbr, 9621 struct tcpcb *tp, int32_t * tlen, struct tcphdr *th, struct socket *so) 9622 { 9623 9624 if (bbr->rc_allow_data_af_clo == 0) { 9625 close_now: 9626 tp = tcp_close(tp); 9627 TCPSTAT_INC(tcps_rcvafterclose); 9628 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); 9629 return (1); 9630 } 9631 if (sbavail(&so->so_snd) == 0) 9632 goto close_now; 9633 /* Ok we allow data that is ignored and a followup reset */ 9634 tp->rcv_nxt = th->th_seq + *tlen; 9635 tp->t_flags2 |= TF2_DROP_AF_DATA; 9636 bbr->r_wanted_output = 1; 9637 *tlen = 0; 9638 return (0); 9639 } 9640 9641 /* 9642 * Return value of 1, the TCB is unlocked and most 9643 * likely gone, return value of 0, the TCB is still 9644 * locked. 9645 */ 9646 static int 9647 bbr_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, 9648 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9649 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9650 { 9651 int32_t ourfinisacked = 0; 9652 int32_t ret_val; 9653 struct tcp_bbr *bbr; 9654 9655 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9656 ctf_calc_rwin(so, tp); 9657 if ((thflags & TH_RST) || 9658 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9659 return (ctf_process_rst(m, th, so, tp)); 9660 /* 9661 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9662 * synchronized state. 9663 */ 9664 if (thflags & TH_SYN) { 9665 ctf_challenge_ack(m, th, tp, &ret_val); 9666 return (ret_val); 9667 } 9668 /* 9669 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9670 * it's less than ts_recent, drop it. 9671 */ 9672 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9673 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9674 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9675 return (ret_val); 9676 } 9677 INP_WLOCK_ASSERT(tp->t_inpcb); 9678 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9679 return (ret_val); 9680 } 9681 /* 9682 * If new data are received on a connection after the user processes 9683 * are gone, then RST the other end. 9684 */ 9685 if ((so->so_state & SS_NOFDREF) && tlen) { 9686 /* 9687 * We call a new function now so we might continue and setup 9688 * to reset at all data being ack'd. 9689 */ 9690 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9691 return (1); 9692 } 9693 /* 9694 * If last ACK falls within this segment's sequence numbers, record 9695 * its timestamp. NOTE: 1) That the test incorporates suggestions 9696 * from the latest proposal of the tcplw@cray.com list (Braden 9697 * 1993/04/26). 2) That updating only on newer timestamps interferes 9698 * with our earlier PAWS tests, so this check should be solely 9699 * predicated on the sequence space of this segment. 3) That we 9700 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9701 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9702 * SEG.Len, This modified check allows us to overcome RFC1323's 9703 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9704 * p.869. In such cases, we can still calculate the RTT correctly 9705 * when RCV.NXT == Last.ACK.Sent. 9706 */ 9707 if ((to->to_flags & TOF_TS) != 0 && 9708 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9709 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9710 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9711 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9712 tp->ts_recent = to->to_tsval; 9713 } 9714 /* 9715 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9716 * is on (half-synchronized state), then queue data for later 9717 * processing; else drop segment and return. 9718 */ 9719 if ((thflags & TH_ACK) == 0) { 9720 if (tp->t_flags & TF_NEEDSYN) { 9721 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9722 tiwin, thflags, nxt_pkt)); 9723 } else if (tp->t_flags & TF_ACKNOW) { 9724 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9725 bbr->r_wanted_output = 1; 9726 return (ret_val); 9727 } else { 9728 ctf_do_drop(m, NULL); 9729 return (0); 9730 } 9731 } 9732 /* 9733 * Ack processing. 9734 */ 9735 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9736 return (ret_val); 9737 } 9738 if (ourfinisacked) { 9739 /* 9740 * If we can't receive any more data, then closing user can 9741 * proceed. Starting the timer is contrary to the 9742 * specification, but if we don't get a FIN we'll hang 9743 * forever. 9744 * 9745 * XXXjl: we should release the tp also, and use a 9746 * compressed state. 9747 */ 9748 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9749 soisdisconnected(so); 9750 tcp_timer_activate(tp, TT_2MSL, 9751 (tcp_fast_finwait2_recycle ? 9752 tcp_finwait2_timeout : 9753 TP_MAXIDLE(tp))); 9754 } 9755 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9756 } 9757 if (sbavail(&so->so_snd)) { 9758 if (bbr_progress_timeout_check(bbr)) { 9759 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9760 return (1); 9761 } 9762 } 9763 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9764 tiwin, thflags, nxt_pkt)); 9765 } 9766 9767 /* 9768 * Return value of 1, the TCB is unlocked and most 9769 * likely gone, return value of 0, the TCB is still 9770 * locked. 9771 */ 9772 static int 9773 bbr_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, 9774 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9775 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9776 { 9777 int32_t ourfinisacked = 0; 9778 int32_t ret_val; 9779 struct tcp_bbr *bbr; 9780 9781 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9782 ctf_calc_rwin(so, tp); 9783 if ((thflags & TH_RST) || 9784 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9785 return (ctf_process_rst(m, th, so, tp)); 9786 /* 9787 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9788 * synchronized state. 9789 */ 9790 if (thflags & TH_SYN) { 9791 ctf_challenge_ack(m, th, tp, &ret_val); 9792 return (ret_val); 9793 } 9794 /* 9795 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9796 * it's less than ts_recent, drop it. 9797 */ 9798 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9799 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9800 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9801 return (ret_val); 9802 } 9803 INP_WLOCK_ASSERT(tp->t_inpcb); 9804 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9805 return (ret_val); 9806 } 9807 /* 9808 * If new data are received on a connection after the user processes 9809 * are gone, then RST the other end. 9810 */ 9811 if ((so->so_state & SS_NOFDREF) && tlen) { 9812 /* 9813 * We call a new function now so we might continue and setup 9814 * to reset at all data being ack'd. 9815 */ 9816 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9817 return (1); 9818 } 9819 /* 9820 * If last ACK falls within this segment's sequence numbers, record 9821 * its timestamp. NOTE: 1) That the test incorporates suggestions 9822 * from the latest proposal of the tcplw@cray.com list (Braden 9823 * 1993/04/26). 2) That updating only on newer timestamps interferes 9824 * with our earlier PAWS tests, so this check should be solely 9825 * predicated on the sequence space of this segment. 3) That we 9826 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9827 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9828 * SEG.Len, This modified check allows us to overcome RFC1323's 9829 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9830 * p.869. In such cases, we can still calculate the RTT correctly 9831 * when RCV.NXT == Last.ACK.Sent. 9832 */ 9833 if ((to->to_flags & TOF_TS) != 0 && 9834 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9835 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9836 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9837 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9838 tp->ts_recent = to->to_tsval; 9839 } 9840 /* 9841 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9842 * is on (half-synchronized state), then queue data for later 9843 * processing; else drop segment and return. 9844 */ 9845 if ((thflags & TH_ACK) == 0) { 9846 if (tp->t_flags & TF_NEEDSYN) { 9847 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9848 tiwin, thflags, nxt_pkt)); 9849 } else if (tp->t_flags & TF_ACKNOW) { 9850 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9851 bbr->r_wanted_output = 1; 9852 return (ret_val); 9853 } else { 9854 ctf_do_drop(m, NULL); 9855 return (0); 9856 } 9857 } 9858 /* 9859 * Ack processing. 9860 */ 9861 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9862 return (ret_val); 9863 } 9864 if (ourfinisacked) { 9865 tcp_twstart(tp); 9866 m_freem(m); 9867 return (1); 9868 } 9869 if (sbavail(&so->so_snd)) { 9870 if (bbr_progress_timeout_check(bbr)) { 9871 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9872 return (1); 9873 } 9874 } 9875 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9876 tiwin, thflags, nxt_pkt)); 9877 } 9878 9879 /* 9880 * Return value of 1, the TCB is unlocked and most 9881 * likely gone, return value of 0, the TCB is still 9882 * locked. 9883 */ 9884 static int 9885 bbr_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 9886 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9887 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 9888 { 9889 int32_t ourfinisacked = 0; 9890 int32_t ret_val; 9891 struct tcp_bbr *bbr; 9892 9893 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9894 ctf_calc_rwin(so, tp); 9895 if ((thflags & TH_RST) || 9896 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9897 return (ctf_process_rst(m, th, so, tp)); 9898 /* 9899 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9900 * synchronized state. 9901 */ 9902 if (thflags & TH_SYN) { 9903 ctf_challenge_ack(m, th, tp, &ret_val); 9904 return (ret_val); 9905 } 9906 /* 9907 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9908 * it's less than ts_recent, drop it. 9909 */ 9910 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9911 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9912 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9913 return (ret_val); 9914 } 9915 INP_WLOCK_ASSERT(tp->t_inpcb); 9916 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9917 return (ret_val); 9918 } 9919 /* 9920 * If new data are received on a connection after the user processes 9921 * are gone, then RST the other end. 9922 */ 9923 if ((so->so_state & SS_NOFDREF) && tlen) { 9924 /* 9925 * We call a new function now so we might continue and setup 9926 * to reset at all data being ack'd. 9927 */ 9928 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9929 return (1); 9930 } 9931 /* 9932 * If last ACK falls within this segment's sequence numbers, record 9933 * its timestamp. NOTE: 1) That the test incorporates suggestions 9934 * from the latest proposal of the tcplw@cray.com list (Braden 9935 * 1993/04/26). 2) That updating only on newer timestamps interferes 9936 * with our earlier PAWS tests, so this check should be solely 9937 * predicated on the sequence space of this segment. 3) That we 9938 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9939 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9940 * SEG.Len, This modified check allows us to overcome RFC1323's 9941 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9942 * p.869. In such cases, we can still calculate the RTT correctly 9943 * when RCV.NXT == Last.ACK.Sent. 9944 */ 9945 if ((to->to_flags & TOF_TS) != 0 && 9946 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9947 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9948 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9949 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9950 tp->ts_recent = to->to_tsval; 9951 } 9952 /* 9953 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9954 * is on (half-synchronized state), then queue data for later 9955 * processing; else drop segment and return. 9956 */ 9957 if ((thflags & TH_ACK) == 0) { 9958 if (tp->t_flags & TF_NEEDSYN) { 9959 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9960 tiwin, thflags, nxt_pkt)); 9961 } else if (tp->t_flags & TF_ACKNOW) { 9962 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9963 bbr->r_wanted_output = 1; 9964 return (ret_val); 9965 } else { 9966 ctf_do_drop(m, NULL); 9967 return (0); 9968 } 9969 } 9970 /* 9971 * case TCPS_LAST_ACK: Ack processing. 9972 */ 9973 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9974 return (ret_val); 9975 } 9976 if (ourfinisacked) { 9977 tp = tcp_close(tp); 9978 ctf_do_drop(m, tp); 9979 return (1); 9980 } 9981 if (sbavail(&so->so_snd)) { 9982 if (bbr_progress_timeout_check(bbr)) { 9983 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9984 return (1); 9985 } 9986 } 9987 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9988 tiwin, thflags, nxt_pkt)); 9989 } 9990 9991 9992 /* 9993 * Return value of 1, the TCB is unlocked and most 9994 * likely gone, return value of 0, the TCB is still 9995 * locked. 9996 */ 9997 static int 9998 bbr_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, 9999 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 10000 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 10001 { 10002 int32_t ourfinisacked = 0; 10003 int32_t ret_val; 10004 struct tcp_bbr *bbr; 10005 10006 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10007 ctf_calc_rwin(so, tp); 10008 /* Reset receive buffer auto scaling when not in bulk receive mode. */ 10009 if ((thflags & TH_RST) || 10010 (tp->t_fin_is_rst && (thflags & TH_FIN))) 10011 return (ctf_process_rst(m, th, so, tp)); 10012 10013 /* 10014 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 10015 * synchronized state. 10016 */ 10017 if (thflags & TH_SYN) { 10018 ctf_challenge_ack(m, th, tp, &ret_val); 10019 return (ret_val); 10020 } 10021 INP_WLOCK_ASSERT(tp->t_inpcb); 10022 /* 10023 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 10024 * it's less than ts_recent, drop it. 10025 */ 10026 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 10027 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 10028 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 10029 return (ret_val); 10030 } 10031 INP_WLOCK_ASSERT(tp->t_inpcb); 10032 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 10033 return (ret_val); 10034 } 10035 /* 10036 * If new data are received on a connection after the user processes 10037 * are gone, then we may RST the other end depending on the outcome 10038 * of bbr_check_data_after_close. 10039 */ 10040 if ((so->so_state & SS_NOFDREF) && 10041 tlen) { 10042 /* 10043 * We call a new function now so we might continue and setup 10044 * to reset at all data being ack'd. 10045 */ 10046 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 10047 return (1); 10048 } 10049 INP_WLOCK_ASSERT(tp->t_inpcb); 10050 /* 10051 * If last ACK falls within this segment's sequence numbers, record 10052 * its timestamp. NOTE: 1) That the test incorporates suggestions 10053 * from the latest proposal of the tcplw@cray.com list (Braden 10054 * 1993/04/26). 2) That updating only on newer timestamps interferes 10055 * with our earlier PAWS tests, so this check should be solely 10056 * predicated on the sequence space of this segment. 3) That we 10057 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 10058 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 10059 * SEG.Len, This modified check allows us to overcome RFC1323's 10060 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 10061 * p.869. In such cases, we can still calculate the RTT correctly 10062 * when RCV.NXT == Last.ACK.Sent. 10063 */ 10064 INP_WLOCK_ASSERT(tp->t_inpcb); 10065 if ((to->to_flags & TOF_TS) != 0 && 10066 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 10067 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 10068 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 10069 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 10070 tp->ts_recent = to->to_tsval; 10071 } 10072 /* 10073 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 10074 * is on (half-synchronized state), then queue data for later 10075 * processing; else drop segment and return. 10076 */ 10077 if ((thflags & TH_ACK) == 0) { 10078 if (tp->t_flags & TF_NEEDSYN) { 10079 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 10080 tiwin, thflags, nxt_pkt)); 10081 } else if (tp->t_flags & TF_ACKNOW) { 10082 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 10083 bbr->r_wanted_output = 1; 10084 return (ret_val); 10085 } else { 10086 ctf_do_drop(m, NULL); 10087 return (0); 10088 } 10089 } 10090 /* 10091 * Ack processing. 10092 */ 10093 INP_WLOCK_ASSERT(tp->t_inpcb); 10094 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 10095 return (ret_val); 10096 } 10097 if (sbavail(&so->so_snd)) { 10098 if (bbr_progress_timeout_check(bbr)) { 10099 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 10100 return (1); 10101 } 10102 } 10103 INP_WLOCK_ASSERT(tp->t_inpcb); 10104 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 10105 tiwin, thflags, nxt_pkt)); 10106 } 10107 10108 static void 10109 bbr_stop_all_timers(struct tcpcb *tp) 10110 { 10111 struct tcp_bbr *bbr; 10112 10113 /* 10114 * Assure no timers are running. 10115 */ 10116 if (tcp_timer_active(tp, TT_PERSIST)) { 10117 /* We enter in persists, set the flag appropriately */ 10118 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10119 bbr->rc_in_persist = 1; 10120 } 10121 tcp_timer_suspend(tp, TT_PERSIST); 10122 tcp_timer_suspend(tp, TT_REXMT); 10123 tcp_timer_suspend(tp, TT_KEEP); 10124 tcp_timer_suspend(tp, TT_DELACK); 10125 } 10126 10127 static void 10128 bbr_google_mode_on(struct tcp_bbr *bbr) 10129 { 10130 bbr->rc_use_google = 1; 10131 bbr->rc_no_pacing = 0; 10132 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 10133 bbr->r_use_policer = bbr_policer_detection_enabled; 10134 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 10135 bbr->bbr_use_rack_cheat = 0; 10136 bbr->r_ctl.rc_incr_tmrs = 0; 10137 bbr->r_ctl.rc_inc_tcp_oh = 0; 10138 bbr->r_ctl.rc_inc_ip_oh = 0; 10139 bbr->r_ctl.rc_inc_enet_oh = 0; 10140 reset_time(&bbr->r_ctl.rc_delrate, 10141 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 10142 reset_time_small(&bbr->r_ctl.rc_rttprop, 10143 (11 * USECS_IN_SECOND)); 10144 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 10145 } 10146 10147 static void 10148 bbr_google_mode_off(struct tcp_bbr *bbr) 10149 { 10150 bbr->rc_use_google = 0; 10151 bbr->r_ctl.bbr_google_discount = 0; 10152 bbr->no_pacing_until = bbr_no_pacing_until; 10153 bbr->r_use_policer = 0; 10154 if (bbr->no_pacing_until) 10155 bbr->rc_no_pacing = 1; 10156 else 10157 bbr->rc_no_pacing = 0; 10158 if (bbr_use_rack_resend_cheat) 10159 bbr->bbr_use_rack_cheat = 1; 10160 else 10161 bbr->bbr_use_rack_cheat = 0; 10162 if (bbr_incr_timers) 10163 bbr->r_ctl.rc_incr_tmrs = 1; 10164 else 10165 bbr->r_ctl.rc_incr_tmrs = 0; 10166 if (bbr_include_tcp_oh) 10167 bbr->r_ctl.rc_inc_tcp_oh = 1; 10168 else 10169 bbr->r_ctl.rc_inc_tcp_oh = 0; 10170 if (bbr_include_ip_oh) 10171 bbr->r_ctl.rc_inc_ip_oh = 1; 10172 else 10173 bbr->r_ctl.rc_inc_ip_oh = 0; 10174 if (bbr_include_enet_oh) 10175 bbr->r_ctl.rc_inc_enet_oh = 1; 10176 else 10177 bbr->r_ctl.rc_inc_enet_oh = 0; 10178 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10179 reset_time(&bbr->r_ctl.rc_delrate, 10180 bbr_num_pktepo_for_del_limit); 10181 reset_time_small(&bbr->r_ctl.rc_rttprop, 10182 (bbr_filter_len_sec * USECS_IN_SECOND)); 10183 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 10184 } 10185 /* 10186 * Return 0 on success, non-zero on failure 10187 * which indicates the error (usually no memory). 10188 */ 10189 static int 10190 bbr_init(struct tcpcb *tp) 10191 { 10192 struct tcp_bbr *bbr = NULL; 10193 struct inpcb *inp; 10194 uint32_t cts; 10195 10196 tp->t_fb_ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO)); 10197 if (tp->t_fb_ptr == NULL) { 10198 /* 10199 * We need to allocate memory but cant. The INP and INP_INFO 10200 * locks and they are recusive (happens during setup. So a 10201 * scheme to drop the locks fails :( 10202 * 10203 */ 10204 return (ENOMEM); 10205 } 10206 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10207 bbr->rtt_valid = 0; 10208 inp = tp->t_inpcb; 10209 inp->inp_flags2 |= INP_CANNOT_DO_ECN; 10210 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ; 10211 TAILQ_INIT(&bbr->r_ctl.rc_map); 10212 TAILQ_INIT(&bbr->r_ctl.rc_free); 10213 TAILQ_INIT(&bbr->r_ctl.rc_tmap); 10214 bbr->rc_tp = tp; 10215 if (tp->t_inpcb) { 10216 bbr->rc_inp = tp->t_inpcb; 10217 } 10218 cts = tcp_get_usecs(&bbr->rc_tv); 10219 tp->t_acktime = 0; 10220 bbr->rc_allow_data_af_clo = bbr_ignore_data_after_close; 10221 bbr->r_ctl.rc_reorder_fade = bbr_reorder_fade; 10222 bbr->rc_tlp_threshold = bbr_tlp_thresh; 10223 bbr->r_ctl.rc_reorder_shift = bbr_reorder_thresh; 10224 bbr->r_ctl.rc_pkt_delay = bbr_pkt_delay; 10225 bbr->r_ctl.rc_min_to = bbr_min_to; 10226 bbr->rc_bbr_state = BBR_STATE_STARTUP; 10227 bbr->r_ctl.bbr_lost_at_state = 0; 10228 bbr->r_ctl.rc_lost_at_startup = 0; 10229 bbr->rc_all_timers_stopped = 0; 10230 bbr->r_ctl.rc_bbr_lastbtlbw = 0; 10231 bbr->r_ctl.rc_pkt_epoch_del = 0; 10232 bbr->r_ctl.rc_pkt_epoch = 0; 10233 bbr->r_ctl.rc_lowest_rtt = 0xffffffff; 10234 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_high_gain; 10235 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 10236 bbr->r_ctl.rc_went_idle_time = cts; 10237 bbr->rc_pacer_started = cts; 10238 bbr->r_ctl.rc_pkt_epoch_time = cts; 10239 bbr->r_ctl.rc_rcvtime = cts; 10240 bbr->r_ctl.rc_bbr_state_time = cts; 10241 bbr->r_ctl.rc_del_time = cts; 10242 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 10243 bbr->r_ctl.last_in_probertt = cts; 10244 bbr->skip_gain = 0; 10245 bbr->gain_is_limited = 0; 10246 bbr->no_pacing_until = bbr_no_pacing_until; 10247 if (bbr->no_pacing_until) 10248 bbr->rc_no_pacing = 1; 10249 if (bbr_use_google_algo) { 10250 bbr->rc_no_pacing = 0; 10251 bbr->rc_use_google = 1; 10252 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 10253 bbr->r_use_policer = bbr_policer_detection_enabled; 10254 } else { 10255 bbr->rc_use_google = 0; 10256 bbr->r_ctl.bbr_google_discount = 0; 10257 bbr->r_use_policer = 0; 10258 } 10259 if (bbr_ts_limiting) 10260 bbr->rc_use_ts_limit = 1; 10261 else 10262 bbr->rc_use_ts_limit = 0; 10263 if (bbr_ts_can_raise) 10264 bbr->ts_can_raise = 1; 10265 else 10266 bbr->ts_can_raise = 0; 10267 if (V_tcp_delack_enabled == 1) 10268 tp->t_delayed_ack = 2; 10269 else if (V_tcp_delack_enabled == 0) 10270 tp->t_delayed_ack = 0; 10271 else if (V_tcp_delack_enabled < 100) 10272 tp->t_delayed_ack = V_tcp_delack_enabled; 10273 else 10274 tp->t_delayed_ack = 2; 10275 if (bbr->rc_use_google == 0) 10276 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10277 else 10278 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 10279 bbr->r_ctl.rc_min_rto_ms = bbr_rto_min_ms; 10280 bbr->rc_max_rto_sec = bbr_rto_max_sec; 10281 bbr->rc_init_win = bbr_def_init_win; 10282 if (tp->t_flags & TF_REQ_TSTMP) 10283 bbr->rc_last_options = TCP_TS_OVERHEAD; 10284 bbr->r_ctl.rc_pace_max_segs = tp->t_maxseg - bbr->rc_last_options; 10285 bbr->r_ctl.rc_high_rwnd = tp->snd_wnd; 10286 bbr->r_init_rtt = 1; 10287 10288 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 10289 if (bbr_allow_hdwr_pacing) 10290 bbr->bbr_hdw_pace_ena = 1; 10291 else 10292 bbr->bbr_hdw_pace_ena = 0; 10293 if (bbr_sends_full_iwnd) 10294 bbr->bbr_init_win_cheat = 1; 10295 else 10296 bbr->bbr_init_win_cheat = 0; 10297 bbr->r_ctl.bbr_utter_max = bbr_hptsi_utter_max; 10298 bbr->r_ctl.rc_drain_pg = bbr_drain_gain; 10299 bbr->r_ctl.rc_startup_pg = bbr_high_gain; 10300 bbr->rc_loss_exit = bbr_exit_startup_at_loss; 10301 bbr->r_ctl.bbr_rttprobe_gain_val = bbr_rttprobe_gain; 10302 bbr->r_ctl.bbr_hptsi_per_second = bbr_hptsi_per_second; 10303 bbr->r_ctl.bbr_hptsi_segments_delay_tar = bbr_hptsi_segments_delay_tar; 10304 bbr->r_ctl.bbr_hptsi_segments_max = bbr_hptsi_segments_max; 10305 bbr->r_ctl.bbr_hptsi_segments_floor = bbr_hptsi_segments_floor; 10306 bbr->r_ctl.bbr_hptsi_bytes_min = bbr_hptsi_bytes_min; 10307 bbr->r_ctl.bbr_cross_over = bbr_cross_over; 10308 bbr->r_ctl.rc_rtt_shrinks = cts; 10309 if (bbr->rc_use_google) { 10310 setup_time_filter(&bbr->r_ctl.rc_delrate, 10311 FILTER_TYPE_MAX, 10312 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 10313 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10314 FILTER_TYPE_MIN, (11 * USECS_IN_SECOND)); 10315 } else { 10316 setup_time_filter(&bbr->r_ctl.rc_delrate, 10317 FILTER_TYPE_MAX, 10318 bbr_num_pktepo_for_del_limit); 10319 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10320 FILTER_TYPE_MIN, (bbr_filter_len_sec * USECS_IN_SECOND)); 10321 } 10322 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_INIT, 0); 10323 if (bbr_uses_idle_restart) 10324 bbr->rc_use_idle_restart = 1; 10325 else 10326 bbr->rc_use_idle_restart = 0; 10327 bbr->r_ctl.rc_bbr_cur_del_rate = 0; 10328 bbr->r_ctl.rc_initial_hptsi_bw = bbr_initial_bw_bps; 10329 if (bbr_resends_use_tso) 10330 bbr->rc_resends_use_tso = 1; 10331 #ifdef NETFLIX_PEAKRATE 10332 tp->t_peakrate_thr = tp->t_maxpeakrate; 10333 #endif 10334 if (tp->snd_una != tp->snd_max) { 10335 /* Create a send map for the current outstanding data */ 10336 struct bbr_sendmap *rsm; 10337 10338 rsm = bbr_alloc(bbr); 10339 if (rsm == NULL) { 10340 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10341 tp->t_fb_ptr = NULL; 10342 return (ENOMEM); 10343 } 10344 rsm->r_flags = BBR_OVERMAX; 10345 rsm->r_tim_lastsent[0] = cts; 10346 rsm->r_rtr_cnt = 1; 10347 rsm->r_rtr_bytes = 0; 10348 rsm->r_start = tp->snd_una; 10349 rsm->r_end = tp->snd_max; 10350 rsm->r_dupack = 0; 10351 rsm->r_delivered = bbr->r_ctl.rc_delivered; 10352 rsm->r_ts_valid = 0; 10353 rsm->r_del_ack_ts = tp->ts_recent; 10354 rsm->r_del_time = cts; 10355 if (bbr->r_ctl.r_app_limited_until) 10356 rsm->r_app_limited = 1; 10357 else 10358 rsm->r_app_limited = 0; 10359 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 10360 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 10361 rsm->r_in_tmap = 1; 10362 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 10363 rsm->r_bbr_state = bbr_state_val(bbr); 10364 else 10365 rsm->r_bbr_state = 8; 10366 } 10367 if (bbr_use_rack_resend_cheat && (bbr->rc_use_google == 0)) 10368 bbr->bbr_use_rack_cheat = 1; 10369 if (bbr_incr_timers && (bbr->rc_use_google == 0)) 10370 bbr->r_ctl.rc_incr_tmrs = 1; 10371 if (bbr_include_tcp_oh && (bbr->rc_use_google == 0)) 10372 bbr->r_ctl.rc_inc_tcp_oh = 1; 10373 if (bbr_include_ip_oh && (bbr->rc_use_google == 0)) 10374 bbr->r_ctl.rc_inc_ip_oh = 1; 10375 if (bbr_include_enet_oh && (bbr->rc_use_google == 0)) 10376 bbr->r_ctl.rc_inc_enet_oh = 1; 10377 10378 bbr_log_type_statechange(bbr, cts, __LINE__); 10379 if (TCPS_HAVEESTABLISHED(tp->t_state) && 10380 (tp->t_srtt)) { 10381 uint32_t rtt; 10382 10383 rtt = (TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); 10384 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 10385 } 10386 /* announce the settings and state */ 10387 bbr_log_settings_change(bbr, BBR_RECOVERY_LOWRTT); 10388 tcp_bbr_tso_size_check(bbr, cts); 10389 /* 10390 * Now call the generic function to start a timer. This will place 10391 * the TCB on the hptsi wheel if a timer is needed with appropriate 10392 * flags. 10393 */ 10394 bbr_stop_all_timers(tp); 10395 bbr_start_hpts_timer(bbr, tp, cts, 5, 0, 0); 10396 return (0); 10397 } 10398 10399 /* 10400 * Return 0 if we can accept the connection. Return 10401 * non-zero if we can't handle the connection. A EAGAIN 10402 * means you need to wait until the connection is up. 10403 * a EADDRNOTAVAIL means we can never handle the connection 10404 * (no SACK). 10405 */ 10406 static int 10407 bbr_handoff_ok(struct tcpcb *tp) 10408 { 10409 if ((tp->t_state == TCPS_CLOSED) || 10410 (tp->t_state == TCPS_LISTEN)) { 10411 /* Sure no problem though it may not stick */ 10412 return (0); 10413 } 10414 if ((tp->t_state == TCPS_SYN_SENT) || 10415 (tp->t_state == TCPS_SYN_RECEIVED)) { 10416 /* 10417 * We really don't know you have to get to ESTAB or beyond 10418 * to tell. 10419 */ 10420 return (EAGAIN); 10421 } 10422 if ((tp->t_flags & TF_SACK_PERMIT) || bbr_sack_not_required) { 10423 return (0); 10424 } 10425 /* 10426 * If we reach here we don't do SACK on this connection so we can 10427 * never do rack. 10428 */ 10429 return (EINVAL); 10430 } 10431 10432 static void 10433 bbr_fini(struct tcpcb *tp, int32_t tcb_is_purged) 10434 { 10435 if (tp->t_fb_ptr) { 10436 uint32_t calc; 10437 struct tcp_bbr *bbr; 10438 struct bbr_sendmap *rsm; 10439 10440 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10441 if (bbr->r_ctl.crte) 10442 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 10443 bbr_log_flowend(bbr); 10444 bbr->rc_tp = NULL; 10445 if (tp->t_inpcb) { 10446 /* Backout any flags2 we applied */ 10447 tp->t_inpcb->inp_flags2 &= ~INP_CANNOT_DO_ECN; 10448 tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ; 10449 tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 10450 } 10451 if (bbr->bbr_hdrw_pacing) 10452 counter_u64_add(bbr_flows_whdwr_pacing, -1); 10453 else 10454 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 10455 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10456 while (rsm) { 10457 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 10458 uma_zfree(bbr_zone, rsm); 10459 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10460 } 10461 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10462 while (rsm) { 10463 TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); 10464 uma_zfree(bbr_zone, rsm); 10465 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10466 } 10467 calc = bbr->r_ctl.rc_high_rwnd - bbr->r_ctl.rc_init_rwnd; 10468 if (calc > (bbr->r_ctl.rc_init_rwnd / 10)) 10469 BBR_STAT_INC(bbr_dynamic_rwnd); 10470 else 10471 BBR_STAT_INC(bbr_static_rwnd); 10472 bbr->r_ctl.rc_free_cnt = 0; 10473 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10474 tp->t_fb_ptr = NULL; 10475 } 10476 /* Make sure snd_nxt is correctly set */ 10477 tp->snd_nxt = tp->snd_max; 10478 } 10479 10480 static void 10481 bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win) 10482 { 10483 switch (tp->t_state) { 10484 case TCPS_SYN_SENT: 10485 bbr->r_state = TCPS_SYN_SENT; 10486 bbr->r_substate = bbr_do_syn_sent; 10487 break; 10488 case TCPS_SYN_RECEIVED: 10489 bbr->r_state = TCPS_SYN_RECEIVED; 10490 bbr->r_substate = bbr_do_syn_recv; 10491 break; 10492 case TCPS_ESTABLISHED: 10493 bbr->r_ctl.rc_init_rwnd = max(win, bbr->rc_tp->snd_wnd); 10494 bbr->r_state = TCPS_ESTABLISHED; 10495 bbr->r_substate = bbr_do_established; 10496 break; 10497 case TCPS_CLOSE_WAIT: 10498 bbr->r_state = TCPS_CLOSE_WAIT; 10499 bbr->r_substate = bbr_do_close_wait; 10500 break; 10501 case TCPS_FIN_WAIT_1: 10502 bbr->r_state = TCPS_FIN_WAIT_1; 10503 bbr->r_substate = bbr_do_fin_wait_1; 10504 break; 10505 case TCPS_CLOSING: 10506 bbr->r_state = TCPS_CLOSING; 10507 bbr->r_substate = bbr_do_closing; 10508 break; 10509 case TCPS_LAST_ACK: 10510 bbr->r_state = TCPS_LAST_ACK; 10511 bbr->r_substate = bbr_do_lastack; 10512 break; 10513 case TCPS_FIN_WAIT_2: 10514 bbr->r_state = TCPS_FIN_WAIT_2; 10515 bbr->r_substate = bbr_do_fin_wait_2; 10516 break; 10517 case TCPS_LISTEN: 10518 case TCPS_CLOSED: 10519 case TCPS_TIME_WAIT: 10520 default: 10521 break; 10522 }; 10523 } 10524 10525 static void 10526 bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int32_t line, int dolog) 10527 { 10528 /* 10529 * Now what state are we going into now? Is there adjustments 10530 * needed? 10531 */ 10532 int32_t old_state, old_gain; 10533 10534 10535 old_state = bbr_state_val(bbr); 10536 old_gain = bbr->r_ctl.rc_bbr_hptsi_gain; 10537 if (bbr_state_val(bbr) == BBR_SUB_LEVEL1) { 10538 /* Save the lowest srtt we saw in our end of the sub-state */ 10539 bbr->rc_hit_state_1 = 0; 10540 if (bbr->r_ctl.bbr_smallest_srtt_this_state != 0xffffffff) 10541 bbr->r_ctl.bbr_smallest_srtt_state2 = bbr->r_ctl.bbr_smallest_srtt_this_state; 10542 } 10543 bbr->rc_bbr_substate++; 10544 if (bbr->rc_bbr_substate >= BBR_SUBSTATE_COUNT) { 10545 /* Cycle back to first state-> gain */ 10546 bbr->rc_bbr_substate = 0; 10547 } 10548 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10549 /* 10550 * We enter the gain(5/4) cycle (possibly less if 10551 * shallow buffer detection is enabled) 10552 */ 10553 if (bbr->skip_gain) { 10554 /* 10555 * Hardware pacing has set our rate to 10556 * the max and limited our b/w just 10557 * do level i.e. no gain. 10558 */ 10559 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_LEVEL1]; 10560 } else if (bbr->gain_is_limited && 10561 bbr->bbr_hdrw_pacing && 10562 bbr->r_ctl.crte) { 10563 /* 10564 * We can't gain above the hardware pacing 10565 * rate which is less than our rate + the gain 10566 * calculate the gain needed to reach the hardware 10567 * pacing rate.. 10568 */ 10569 uint64_t bw, rate, gain_calc; 10570 10571 bw = bbr_get_bw(bbr); 10572 rate = bbr->r_ctl.crte->rate; 10573 if ((rate > bw) && 10574 (((bw * (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]) / (uint64_t)BBR_UNIT) > rate)) { 10575 gain_calc = (rate * BBR_UNIT) / bw; 10576 if (gain_calc < BBR_UNIT) 10577 gain_calc = BBR_UNIT; 10578 bbr->r_ctl.rc_bbr_hptsi_gain = (uint16_t)gain_calc; 10579 } else { 10580 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10581 } 10582 } else 10583 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10584 if ((bbr->rc_use_google == 0) && (bbr_gain_to_target == 0)) { 10585 bbr->r_ctl.rc_bbr_state_atflight = cts; 10586 } else 10587 bbr->r_ctl.rc_bbr_state_atflight = 0; 10588 } else if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10589 bbr->rc_hit_state_1 = 1; 10590 bbr->r_ctl.rc_exta_time_gd = 0; 10591 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10592 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10593 if (bbr_state_drain_2_tar) { 10594 bbr->r_ctl.rc_bbr_state_atflight = 0; 10595 } else 10596 bbr->r_ctl.rc_bbr_state_atflight = cts; 10597 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_DRAIN]; 10598 } else { 10599 /* All other cycles hit here 2-7 */ 10600 if ((old_state == BBR_SUB_DRAIN) && bbr->rc_hit_state_1) { 10601 if (bbr_sub_drain_slam_cwnd && 10602 (bbr->rc_use_google == 0) && 10603 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10604 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10605 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10606 } 10607 if ((cts - bbr->r_ctl.rc_bbr_state_time) > bbr_get_rtt(bbr, BBR_RTT_PROP)) 10608 bbr->r_ctl.rc_exta_time_gd += ((cts - bbr->r_ctl.rc_bbr_state_time) - 10609 bbr_get_rtt(bbr, BBR_RTT_PROP)); 10610 else 10611 bbr->r_ctl.rc_exta_time_gd = 0; 10612 if (bbr->r_ctl.rc_exta_time_gd) { 10613 bbr->r_ctl.rc_level_state_extra = bbr->r_ctl.rc_exta_time_gd; 10614 /* Now chop up the time for each state (div by 7) */ 10615 bbr->r_ctl.rc_level_state_extra /= 7; 10616 if (bbr_rand_ot && bbr->r_ctl.rc_level_state_extra) { 10617 /* Add a randomization */ 10618 bbr_randomize_extra_state_time(bbr); 10619 } 10620 } 10621 } 10622 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10623 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[bbr_state_val(bbr)]; 10624 } 10625 if (bbr->rc_use_google) { 10626 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10627 } 10628 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10629 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 10630 if (dolog) 10631 bbr_log_type_statechange(bbr, cts, line); 10632 10633 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10634 uint32_t time_in; 10635 10636 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10637 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 10638 counter_u64_add(bbr_state_time[(old_state + 5)], time_in); 10639 } else { 10640 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10641 } 10642 } 10643 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 10644 bbr_set_state_target(bbr, __LINE__); 10645 if (bbr_sub_drain_slam_cwnd && 10646 (bbr->rc_use_google == 0) && 10647 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10648 /* Slam down the cwnd */ 10649 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10650 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10651 if (bbr_sub_drain_app_limit) { 10652 /* Go app limited if we are on a long drain */ 10653 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + 10654 ctf_flight_size(bbr->rc_tp, 10655 (bbr->r_ctl.rc_sacked + 10656 bbr->r_ctl.rc_lost_bytes))); 10657 } 10658 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10659 } 10660 if (bbr->rc_lt_use_bw) { 10661 /* In policed mode we clamp pacing_gain to BBR_UNIT */ 10662 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10663 } 10664 /* Google changes TSO size every cycle */ 10665 if (bbr->rc_use_google) 10666 tcp_bbr_tso_size_check(bbr, cts); 10667 bbr->r_ctl.gain_epoch = cts; 10668 bbr->r_ctl.rc_bbr_state_time = cts; 10669 bbr->r_ctl.substate_pe = bbr->r_ctl.rc_pkt_epoch; 10670 } 10671 10672 static void 10673 bbr_set_probebw_google_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10674 { 10675 if ((bbr_state_val(bbr) == BBR_SUB_DRAIN) && 10676 (google_allow_early_out == 1) && 10677 (bbr->r_ctl.rc_flight_at_input <= bbr->r_ctl.rc_target_at_state)) { 10678 /* We have reached out target flight size possibly early */ 10679 goto change_state; 10680 } 10681 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10682 return; 10683 } 10684 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_get_rtt(bbr, BBR_RTT_PROP)) { 10685 /* 10686 * Must be a rttProp movement forward before 10687 * we can change states. 10688 */ 10689 return; 10690 } 10691 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10692 /* 10693 * The needed time has passed but for 10694 * the gain cycle extra rules apply: 10695 * 1) If we have seen loss, we exit 10696 * 2) If we have not reached the target 10697 * we stay in GAIN (gain-to-target). 10698 */ 10699 if (google_consider_lost && losses) 10700 goto change_state; 10701 if (bbr->r_ctl.rc_target_at_state > bbr->r_ctl.rc_flight_at_input) { 10702 return; 10703 } 10704 } 10705 change_state: 10706 /* For gain we must reach our target, all others last 1 rttProp */ 10707 bbr_substate_change(bbr, cts, __LINE__, 1); 10708 } 10709 10710 static void 10711 bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10712 { 10713 uint32_t flight, bbr_cur_cycle_time; 10714 10715 if (bbr->rc_use_google) { 10716 bbr_set_probebw_google_gains(bbr, cts, losses); 10717 return; 10718 } 10719 if (cts == 0) { 10720 /* 10721 * Never alow cts to be 0 we 10722 * do this so we can judge if 10723 * we have set a timestamp. 10724 */ 10725 cts = 1; 10726 } 10727 if (bbr_state_is_pkt_epoch) 10728 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); 10729 else 10730 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PROP); 10731 10732 if (bbr->r_ctl.rc_bbr_state_atflight == 0) { 10733 if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10734 flight = ctf_flight_size(bbr->rc_tp, 10735 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10736 if (bbr_sub_drain_slam_cwnd && bbr->rc_hit_state_1) { 10737 /* Keep it slam down */ 10738 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state) { 10739 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10740 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10741 } 10742 if (bbr_sub_drain_app_limit) { 10743 /* Go app limited if we are on a long drain */ 10744 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + flight); 10745 } 10746 } 10747 if (TSTMP_GT(cts, bbr->r_ctl.gain_epoch) && 10748 (((cts - bbr->r_ctl.gain_epoch) > bbr_get_rtt(bbr, BBR_RTT_PROP)) || 10749 (flight >= bbr->r_ctl.flightsize_at_drain))) { 10750 /* 10751 * Still here after the same time as 10752 * the gain. We need to drain harder 10753 * for the next srtt. Reduce by a set amount 10754 * the gain drop is capped at DRAIN states 10755 * value (88). 10756 */ 10757 bbr->r_ctl.flightsize_at_drain = flight; 10758 if (bbr_drain_drop_mul && 10759 bbr_drain_drop_div && 10760 (bbr_drain_drop_mul < bbr_drain_drop_div)) { 10761 /* Use your specific drop value (def 4/5 = 20%) */ 10762 bbr->r_ctl.rc_bbr_hptsi_gain *= bbr_drain_drop_mul; 10763 bbr->r_ctl.rc_bbr_hptsi_gain /= bbr_drain_drop_div; 10764 } else { 10765 /* You get drop of 20% */ 10766 bbr->r_ctl.rc_bbr_hptsi_gain *= 4; 10767 bbr->r_ctl.rc_bbr_hptsi_gain /= 5; 10768 } 10769 if (bbr->r_ctl.rc_bbr_hptsi_gain <= bbr_drain_floor) { 10770 /* Reduce our gain again to the bottom */ 10771 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 10772 } 10773 bbr_log_exit_gain(bbr, cts, 4); 10774 /* 10775 * Extend out so we wait another 10776 * epoch before dropping again. 10777 */ 10778 bbr->r_ctl.gain_epoch = cts; 10779 } 10780 if (flight <= bbr->r_ctl.rc_target_at_state) { 10781 if (bbr_sub_drain_slam_cwnd && 10782 (bbr->rc_use_google == 0) && 10783 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10784 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10785 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10786 } 10787 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10788 bbr_log_exit_gain(bbr, cts, 3); 10789 } 10790 } else { 10791 /* Its a gain */ 10792 if (bbr->r_ctl.rc_lost > bbr->r_ctl.bbr_lost_at_state) { 10793 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10794 goto change_state; 10795 } 10796 if ((ctf_outstanding(bbr->rc_tp) >= bbr->r_ctl.rc_target_at_state) || 10797 ((ctf_outstanding(bbr->rc_tp) + bbr->rc_tp->t_maxseg - 1) >= 10798 bbr->rc_tp->snd_wnd)) { 10799 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10800 bbr_log_exit_gain(bbr, cts, 2); 10801 } 10802 } 10803 /** 10804 * We fall through and return always one of two things has 10805 * occured. 10806 * 1) We are still not at target 10807 * <or> 10808 * 2) We reached the target and set rc_bbr_state_atflight 10809 * which means we no longer hit this block 10810 * next time we are called. 10811 */ 10812 return; 10813 } 10814 change_state: 10815 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) 10816 return; 10817 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_cur_cycle_time) { 10818 /* Less than a full time-period has passed */ 10819 return; 10820 } 10821 if (bbr->r_ctl.rc_level_state_extra && 10822 (bbr_state_val(bbr) > BBR_SUB_DRAIN) && 10823 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10824 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10825 /* Less than a full time-period + extra has passed */ 10826 return; 10827 } 10828 if (bbr_gain_gets_extra_too && 10829 bbr->r_ctl.rc_level_state_extra && 10830 (bbr_state_val(bbr) == BBR_SUB_GAIN) && 10831 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10832 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10833 /* Less than a full time-period + extra has passed */ 10834 return; 10835 } 10836 bbr_substate_change(bbr, cts, __LINE__, 1); 10837 } 10838 10839 static uint32_t 10840 bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain) 10841 { 10842 uint32_t mss, tar; 10843 10844 if (bbr->rc_use_google) { 10845 /* Google just uses the cwnd target */ 10846 tar = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), gain); 10847 } else { 10848 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), 10849 bbr->r_ctl.rc_pace_max_segs); 10850 /* Get the base cwnd with gain rounded to a mss */ 10851 tar = roundup(bbr_get_raw_target_cwnd(bbr, bbr_get_bw(bbr), 10852 gain), mss); 10853 /* Make sure it is within our min */ 10854 if (tar < get_min_cwnd(bbr)) 10855 return (get_min_cwnd(bbr)); 10856 } 10857 return (tar); 10858 } 10859 10860 static void 10861 bbr_set_state_target(struct tcp_bbr *bbr, int line) 10862 { 10863 uint32_t tar, meth; 10864 10865 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 10866 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 10867 /* Special case using old probe-rtt method */ 10868 tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10869 meth = 1; 10870 } else { 10871 /* Non-probe-rtt case and reduced probe-rtt */ 10872 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 10873 (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) { 10874 /* For gain cycle we use the hptsi gain */ 10875 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10876 meth = 2; 10877 } else if ((bbr_target_is_bbunit) || bbr->rc_use_google) { 10878 /* 10879 * If configured, or for google all other states 10880 * get BBR_UNIT. 10881 */ 10882 tar = bbr_get_a_state_target(bbr, BBR_UNIT); 10883 meth = 3; 10884 } else { 10885 /* 10886 * Or we set a target based on the pacing gain 10887 * for non-google mode and default (non-configured). 10888 * Note we don't set a target goal below drain (192). 10889 */ 10890 if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN]) { 10891 tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]); 10892 meth = 4; 10893 } else { 10894 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10895 meth = 5; 10896 } 10897 } 10898 } 10899 bbr_log_set_of_state_target(bbr, tar, line, meth); 10900 bbr->r_ctl.rc_target_at_state = tar; 10901 } 10902 10903 static void 10904 bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 10905 { 10906 /* Change to probe_rtt */ 10907 uint32_t time_in; 10908 10909 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10910 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10911 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10912 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.flightsize_at_drain 10913 + bbr->r_ctl.rc_delivered); 10914 /* Setup so we force feed the filter */ 10915 if (bbr->rc_use_google || bbr_probertt_sets_rtt) 10916 bbr->rc_prtt_set_ts = 1; 10917 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10918 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10919 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10920 } 10921 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_ENTERPROBE, 0); 10922 bbr->r_ctl.rc_rtt_shrinks = cts; 10923 bbr->r_ctl.last_in_probertt = cts; 10924 bbr->r_ctl.rc_probertt_srttchktim = cts; 10925 bbr->r_ctl.rc_bbr_state_time = cts; 10926 bbr->rc_bbr_state = BBR_STATE_PROBE_RTT; 10927 /* We need to force the filter to update */ 10928 10929 if ((bbr_sub_drain_slam_cwnd) && 10930 bbr->rc_hit_state_1 && 10931 (bbr->rc_use_google == 0) && 10932 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10933 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_saved_cwnd) 10934 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10935 } else 10936 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10937 /* Update the lost */ 10938 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 10939 if ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google){ 10940 /* Set to the non-configurable default of 4 (PROBE_RTT_MIN) */ 10941 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10942 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10943 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10944 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10945 bbr_log_set_of_state_target(bbr, bbr->rc_tp->snd_cwnd, __LINE__, 6); 10946 bbr->r_ctl.rc_target_at_state = bbr->rc_tp->snd_cwnd; 10947 } else { 10948 /* 10949 * We bring it down slowly by using a hptsi gain that is 10950 * probably 75%. This will slowly float down our outstanding 10951 * without tampering with the cwnd. 10952 */ 10953 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 10954 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10955 bbr_set_state_target(bbr, __LINE__); 10956 if (bbr_prtt_slam_cwnd && 10957 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 10958 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10959 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10960 } 10961 } 10962 if (ctf_flight_size(bbr->rc_tp, 10963 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 10964 bbr->r_ctl.rc_target_at_state) { 10965 /* We are at target */ 10966 bbr->r_ctl.rc_bbr_enters_probertt = cts; 10967 } else { 10968 /* We need to come down to reach target before our time begins */ 10969 bbr->r_ctl.rc_bbr_enters_probertt = 0; 10970 } 10971 bbr->r_ctl.rc_pe_of_prtt = bbr->r_ctl.rc_pkt_epoch; 10972 BBR_STAT_INC(bbr_enter_probertt); 10973 bbr_log_exit_gain(bbr, cts, 0); 10974 bbr_log_type_statechange(bbr, cts, line); 10975 } 10976 10977 static void 10978 bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts) 10979 { 10980 /* 10981 * Sanity check on probe-rtt intervals. 10982 * In crazy situations where we are competing 10983 * against new-reno flows with huge buffers 10984 * our rtt-prop interval could come to dominate 10985 * things if we can't get through a full set 10986 * of cycles, we need to adjust it. 10987 */ 10988 if (bbr_can_adjust_probertt && 10989 (bbr->rc_use_google == 0)) { 10990 uint16_t val = 0; 10991 uint32_t cur_rttp, fval, newval, baseval; 10992 10993 /* Are we to small and go into probe-rtt to often? */ 10994 baseval = (bbr_get_rtt(bbr, BBR_RTT_PROP) * (BBR_SUBSTATE_COUNT + 1)); 10995 cur_rttp = roundup(baseval, USECS_IN_SECOND); 10996 fval = bbr_filter_len_sec * USECS_IN_SECOND; 10997 if (bbr_is_ratio == 0) { 10998 if (fval > bbr_rtt_probe_limit) 10999 newval = cur_rttp + (fval - bbr_rtt_probe_limit); 11000 else 11001 newval = cur_rttp; 11002 } else { 11003 int mul; 11004 11005 mul = fval / bbr_rtt_probe_limit; 11006 newval = cur_rttp * mul; 11007 } 11008 if (cur_rttp > bbr->r_ctl.rc_probertt_int) { 11009 bbr->r_ctl.rc_probertt_int = cur_rttp; 11010 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 11011 val = 1; 11012 } else { 11013 /* 11014 * No adjustments were made 11015 * do we need to shrink it? 11016 */ 11017 if (bbr->r_ctl.rc_probertt_int > bbr_rtt_probe_limit) { 11018 if (cur_rttp <= bbr_rtt_probe_limit) { 11019 /* 11020 * Things have calmed down lets 11021 * shrink all the way to default 11022 */ 11023 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 11024 reset_time_small(&bbr->r_ctl.rc_rttprop, 11025 (bbr_filter_len_sec * USECS_IN_SECOND)); 11026 cur_rttp = bbr_rtt_probe_limit; 11027 newval = (bbr_filter_len_sec * USECS_IN_SECOND); 11028 val = 2; 11029 } else { 11030 /* 11031 * Well does some adjustment make sense? 11032 */ 11033 if (cur_rttp < bbr->r_ctl.rc_probertt_int) { 11034 /* We can reduce interval time some */ 11035 bbr->r_ctl.rc_probertt_int = cur_rttp; 11036 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 11037 val = 3; 11038 } 11039 } 11040 } 11041 } 11042 if (val) 11043 bbr_log_rtt_shrinks(bbr, cts, cur_rttp, newval, __LINE__, BBR_RTTS_RESETS_VALUES, val); 11044 } 11045 } 11046 11047 static void 11048 bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 11049 { 11050 /* Exit probe-rtt */ 11051 11052 if (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd) { 11053 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 11054 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11055 } 11056 bbr_log_exit_gain(bbr, cts, 1); 11057 bbr->rc_hit_state_1 = 0; 11058 bbr->r_ctl.rc_rtt_shrinks = cts; 11059 bbr->r_ctl.last_in_probertt = cts; 11060 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_RTTPROBE, 0); 11061 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11062 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, 11063 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 11064 bbr->r_ctl.rc_delivered); 11065 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11066 uint32_t time_in; 11067 11068 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11069 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11070 } 11071 if (bbr->rc_filled_pipe) { 11072 /* Switch to probe_bw */ 11073 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11074 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11075 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 11076 bbr_substate_change(bbr, cts, __LINE__, 0); 11077 bbr_log_type_statechange(bbr, cts, __LINE__); 11078 } else { 11079 /* Back to startup */ 11080 bbr->rc_bbr_state = BBR_STATE_STARTUP; 11081 bbr->r_ctl.rc_bbr_state_time = cts; 11082 /* 11083 * We don't want to give a complete free 3 11084 * measurements until we exit, so we use 11085 * the number of pe's we were in probe-rtt 11086 * to add to the startup_epoch. That way 11087 * we will still retain the old state. 11088 */ 11089 bbr->r_ctl.rc_bbr_last_startup_epoch += (bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_pe_of_prtt); 11090 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11091 /* Make sure to use the lower pg when shifting back in */ 11092 if (bbr->r_ctl.rc_lost && 11093 bbr_use_lower_gain_in_startup && 11094 (bbr->rc_use_google == 0)) 11095 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 11096 else 11097 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 11098 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 11099 /* Probably not needed but set it anyway */ 11100 bbr_set_state_target(bbr, __LINE__); 11101 bbr_log_type_statechange(bbr, cts, __LINE__); 11102 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11103 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 0); 11104 } 11105 bbr_check_probe_rtt_limits(bbr, cts); 11106 } 11107 11108 static int32_t inline 11109 bbr_should_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts) 11110 { 11111 if ((bbr->rc_past_init_win == 1) && 11112 (bbr->rc_in_persist == 0) && 11113 (bbr_calc_time(cts, bbr->r_ctl.rc_rtt_shrinks) >= bbr->r_ctl.rc_probertt_int)) { 11114 return (1); 11115 } 11116 if (bbr_can_force_probertt && 11117 (bbr->rc_in_persist == 0) && 11118 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 11119 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 11120 return (1); 11121 } 11122 return (0); 11123 } 11124 11125 11126 static int32_t 11127 bbr_google_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t pkt_epoch) 11128 { 11129 uint64_t btlbw, gain; 11130 if (pkt_epoch == 0) { 11131 /* 11132 * Need to be on a pkt-epoch to continue. 11133 */ 11134 return (0); 11135 } 11136 btlbw = bbr_get_full_bw(bbr); 11137 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11138 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11139 if (btlbw >= gain) { 11140 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 11141 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11142 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 11143 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 11144 } 11145 if ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) 11146 return (1); 11147 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11148 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 11149 return(0); 11150 } 11151 11152 static int32_t inline 11153 bbr_state_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch) 11154 { 11155 /* Have we gained 25% in the last 3 packet based epoch's? */ 11156 uint64_t btlbw, gain; 11157 int do_exit; 11158 int delta, rtt_gain; 11159 11160 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 11161 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 11162 /* 11163 * This qualifies as a RTT_PROBE session since we drop the 11164 * data outstanding to nothing and waited more than 11165 * bbr_rtt_probe_time. 11166 */ 11167 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11168 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11169 } 11170 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11171 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11172 return (0); 11173 } 11174 if (bbr->rc_use_google) 11175 return (bbr_google_startup(bbr, cts, pkt_epoch)); 11176 11177 if ((bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11178 (bbr_use_lower_gain_in_startup)) { 11179 /* Drop to a lower gain 1.5 x since we saw loss */ 11180 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 11181 } 11182 if (pkt_epoch == 0) { 11183 /* 11184 * Need to be on a pkt-epoch to continue. 11185 */ 11186 return (0); 11187 } 11188 if (bbr_rtt_gain_thresh) { 11189 /* 11190 * Do we allow a flow to stay 11191 * in startup with no loss and no 11192 * gain in rtt over a set threshold? 11193 */ 11194 if (bbr->r_ctl.rc_pkt_epoch_rtt && 11195 bbr->r_ctl.startup_last_srtt && 11196 (bbr->r_ctl.rc_pkt_epoch_rtt > bbr->r_ctl.startup_last_srtt)) { 11197 delta = bbr->r_ctl.rc_pkt_epoch_rtt - bbr->r_ctl.startup_last_srtt; 11198 rtt_gain = (delta * 100) / bbr->r_ctl.startup_last_srtt; 11199 } else 11200 rtt_gain = 0; 11201 if ((bbr->r_ctl.startup_last_srtt == 0) || 11202 (bbr->r_ctl.rc_pkt_epoch_rtt < bbr->r_ctl.startup_last_srtt)) 11203 /* First time or new lower value */ 11204 bbr->r_ctl.startup_last_srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 11205 11206 if ((bbr->r_ctl.rc_lost == 0) && 11207 (rtt_gain < bbr_rtt_gain_thresh)) { 11208 /* 11209 * No loss, and we are under 11210 * our gain threhold for 11211 * increasing RTT. 11212 */ 11213 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11214 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11215 bbr_log_startup_event(bbr, cts, rtt_gain, 11216 delta, bbr->r_ctl.startup_last_srtt, 10); 11217 return (0); 11218 } 11219 } 11220 if ((bbr->r_ctl.r_measurement_count == bbr->r_ctl.last_startup_measure) && 11221 (bbr->r_ctl.rc_lost_at_startup == bbr->r_ctl.rc_lost) && 11222 (!IN_RECOVERY(bbr->rc_tp->t_flags))) { 11223 /* 11224 * We only assess if we have a new measurment when 11225 * we have no loss and are not in recovery. 11226 * Drag up by one our last_startup epoch so we will hold 11227 * the number of non-gain we have already accumulated. 11228 */ 11229 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11230 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11231 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11232 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 9); 11233 return (0); 11234 } 11235 /* Case where we reduced the lost (bad retransmit) */ 11236 if (bbr->r_ctl.rc_lost_at_startup > bbr->r_ctl.rc_lost) 11237 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11238 bbr->r_ctl.last_startup_measure = bbr->r_ctl.r_measurement_count; 11239 btlbw = bbr_get_full_bw(bbr); 11240 if (bbr->r_ctl.rc_bbr_hptsi_gain == bbr_startup_lower) 11241 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11242 (uint64_t)bbr_low_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11243 else 11244 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11245 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11246 do_exit = 0; 11247 if (btlbw > bbr->r_ctl.rc_bbr_lastbtlbw) 11248 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 11249 if (btlbw >= gain) { 11250 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 11251 /* Update the lost so we won't exit in next set of tests */ 11252 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11253 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11254 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 11255 } 11256 if ((bbr->rc_loss_exit && 11257 (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11258 (bbr->r_ctl.rc_pkt_epoch_loss_rate > bbr_startup_loss_thresh)) && 11259 ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)) { 11260 /* 11261 * If we had no gain, we had loss and that loss was above 11262 * our threshould, the rwnd is not constrained, and we have 11263 * had at least 3 packet epochs exit. Note that this is 11264 * switched off by sysctl. Google does not do this by the 11265 * way. 11266 */ 11267 if ((ctf_flight_size(bbr->rc_tp, 11268 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 11269 (2 * max(bbr->r_ctl.rc_pace_max_segs, bbr->rc_tp->t_maxseg))) <= bbr->rc_tp->snd_wnd) { 11270 do_exit = 1; 11271 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11272 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 4); 11273 } else { 11274 /* Just record an updated loss value */ 11275 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11276 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11277 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 5); 11278 } 11279 } else 11280 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11281 if (((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) || 11282 do_exit) { 11283 /* Return 1 to exit the startup state. */ 11284 return (1); 11285 } 11286 /* Stay in startup */ 11287 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11288 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 11289 return (0); 11290 } 11291 11292 static void 11293 bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch, uint32_t losses) 11294 { 11295 /* 11296 * A tick occured in the rtt epoch do we need to do anything? 11297 */ 11298 #ifdef BBR_INVARIANTS 11299 if ((bbr->rc_bbr_state != BBR_STATE_STARTUP) && 11300 (bbr->rc_bbr_state != BBR_STATE_DRAIN) && 11301 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) && 11302 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 11303 (bbr->rc_bbr_state != BBR_STATE_PROBE_BW)) { 11304 /* Debug code? */ 11305 panic("Unknown BBR state %d?\n", bbr->rc_bbr_state); 11306 } 11307 #endif 11308 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 11309 /* Do we exit the startup state? */ 11310 if (bbr_state_startup(bbr, cts, epoch, pkt_epoch)) { 11311 uint32_t time_in; 11312 11313 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11314 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 6); 11315 bbr->rc_filled_pipe = 1; 11316 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11317 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11318 11319 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11320 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11321 } else 11322 time_in = 0; 11323 if (bbr->rc_no_pacing) 11324 bbr->rc_no_pacing = 0; 11325 bbr->r_ctl.rc_bbr_state_time = cts; 11326 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_drain_pg; 11327 bbr->rc_bbr_state = BBR_STATE_DRAIN; 11328 bbr_set_state_target(bbr, __LINE__); 11329 if ((bbr->rc_use_google == 0) && 11330 bbr_slam_cwnd_in_main_drain) { 11331 /* Here we don't have to worry about probe-rtt */ 11332 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 11333 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11334 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11335 } 11336 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 11337 bbr_log_type_statechange(bbr, cts, __LINE__); 11338 if (ctf_flight_size(bbr->rc_tp, 11339 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 11340 bbr->r_ctl.rc_target_at_state) { 11341 /* 11342 * Switch to probe_bw if we are already 11343 * there 11344 */ 11345 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11346 bbr_substate_change(bbr, cts, __LINE__, 0); 11347 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11348 bbr_log_type_statechange(bbr, cts, __LINE__); 11349 } 11350 } 11351 } else if (bbr->rc_bbr_state == BBR_STATE_IDLE_EXIT) { 11352 uint32_t inflight; 11353 struct tcpcb *tp; 11354 11355 tp = bbr->rc_tp; 11356 inflight = ctf_flight_size(tp, 11357 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11358 if (inflight >= bbr->r_ctl.rc_target_at_state) { 11359 /* We have reached a flight of the cwnd target */ 11360 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11361 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11362 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 11363 bbr_set_state_target(bbr, __LINE__); 11364 /* 11365 * Rig it so we don't do anything crazy and 11366 * start fresh with a new randomization. 11367 */ 11368 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 11369 bbr->rc_bbr_substate = BBR_SUB_LEVEL6; 11370 bbr_substate_change(bbr, cts, __LINE__, 1); 11371 } 11372 } else if (bbr->rc_bbr_state == BBR_STATE_DRAIN) { 11373 /* Has in-flight reached the bdp (or less)? */ 11374 uint32_t inflight; 11375 struct tcpcb *tp; 11376 11377 tp = bbr->rc_tp; 11378 inflight = ctf_flight_size(tp, 11379 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11380 if ((bbr->rc_use_google == 0) && 11381 bbr_slam_cwnd_in_main_drain && 11382 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11383 /* 11384 * Here we don't have to worry about probe-rtt 11385 * re-slam it, but keep it slammed down. 11386 */ 11387 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11388 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11389 } 11390 if (inflight <= bbr->r_ctl.rc_target_at_state) { 11391 /* We have drained */ 11392 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11393 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11394 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11395 uint32_t time_in; 11396 11397 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11398 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11399 } 11400 if ((bbr->rc_use_google == 0) && 11401 bbr_slam_cwnd_in_main_drain && 11402 (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 11403 /* Restore the cwnd */ 11404 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 11405 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11406 } 11407 /* Setup probe-rtt has being done now RRS-HERE */ 11408 bbr->r_ctl.rc_rtt_shrinks = cts; 11409 bbr->r_ctl.last_in_probertt = cts; 11410 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_LEAVE_DRAIN, 0); 11411 /* Randomly pick a sub-state */ 11412 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11413 bbr_substate_change(bbr, cts, __LINE__, 0); 11414 bbr_log_type_statechange(bbr, cts, __LINE__); 11415 } 11416 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) { 11417 uint32_t flight; 11418 11419 flight = ctf_flight_size(bbr->rc_tp, 11420 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11421 bbr->r_ctl.r_app_limited_until = (flight + bbr->r_ctl.rc_delivered); 11422 if (((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google) && 11423 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11424 /* 11425 * We must keep cwnd at the desired MSS. 11426 */ 11427 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 11428 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11429 } else if ((bbr_prtt_slam_cwnd) && 11430 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11431 /* Re-slam it */ 11432 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11433 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11434 } 11435 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) { 11436 /* Has outstanding reached our target? */ 11437 if (flight <= bbr->r_ctl.rc_target_at_state) { 11438 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_REACHTAR, 0); 11439 bbr->r_ctl.rc_bbr_enters_probertt = cts; 11440 /* If time is exactly 0, be 1usec off */ 11441 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) 11442 bbr->r_ctl.rc_bbr_enters_probertt = 1; 11443 if (bbr->rc_use_google == 0) { 11444 /* 11445 * Restore any lowering that as occured to 11446 * reach here 11447 */ 11448 if (bbr->r_ctl.bbr_rttprobe_gain_val) 11449 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 11450 else 11451 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11452 } 11453 } 11454 if ((bbr->r_ctl.rc_bbr_enters_probertt == 0) && 11455 (bbr->rc_use_google == 0) && 11456 bbr->r_ctl.bbr_rttprobe_gain_val && 11457 (((cts - bbr->r_ctl.rc_probertt_srttchktim) > bbr_get_rtt(bbr, bbr_drain_rtt)) || 11458 (flight >= bbr->r_ctl.flightsize_at_drain))) { 11459 /* 11460 * We have doddled with our current hptsi 11461 * gain an srtt and have still not made it 11462 * to target, or we have increased our flight. 11463 * Lets reduce the gain by xx% 11464 * flooring the reduce at DRAIN (based on 11465 * mul/div) 11466 */ 11467 int red; 11468 11469 bbr->r_ctl.flightsize_at_drain = flight; 11470 bbr->r_ctl.rc_probertt_srttchktim = cts; 11471 red = max((bbr->r_ctl.bbr_rttprobe_gain_val / 10), 1); 11472 if ((bbr->r_ctl.rc_bbr_hptsi_gain - red) > max(bbr_drain_floor, 1)) { 11473 /* Reduce our gain again */ 11474 bbr->r_ctl.rc_bbr_hptsi_gain -= red; 11475 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG, 0); 11476 } else if (bbr->r_ctl.rc_bbr_hptsi_gain > max(bbr_drain_floor, 1)) { 11477 /* one more chance before we give up */ 11478 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 11479 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG_FINAL, 0); 11480 } else { 11481 /* At the very bottom */ 11482 bbr->r_ctl.rc_bbr_hptsi_gain = max((bbr_drain_floor-1), 1); 11483 } 11484 } 11485 } 11486 if (bbr->r_ctl.rc_bbr_enters_probertt && 11487 (TSTMP_GT(cts, bbr->r_ctl.rc_bbr_enters_probertt)) && 11488 ((cts - bbr->r_ctl.rc_bbr_enters_probertt) >= bbr_rtt_probe_time)) { 11489 /* Time to exit probe RTT normally */ 11490 bbr_exit_probe_rtt(bbr->rc_tp, bbr, cts); 11491 } 11492 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 11493 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 11494 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 11495 /* 11496 * This qualifies as a RTT_PROBE session since we 11497 * drop the data outstanding to nothing and waited 11498 * more than bbr_rtt_probe_time. 11499 */ 11500 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11501 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11502 } 11503 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11504 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11505 } else { 11506 bbr_set_probebw_gains(bbr, cts, losses); 11507 } 11508 } 11509 } 11510 11511 static void 11512 bbr_check_bbr_for_state(struct tcp_bbr *bbr, uint32_t cts, int32_t line, uint32_t losses) 11513 { 11514 int32_t epoch = 0; 11515 11516 if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 11517 bbr_set_epoch(bbr, cts, line); 11518 /* At each epoch doe lt bw sampling */ 11519 epoch = 1; 11520 } 11521 bbr_state_change(bbr, cts, epoch, bbr->rc_is_pkt_epoch_now, losses); 11522 } 11523 11524 static int 11525 bbr_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so, 11526 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, 11527 int32_t nxt_pkt, struct timeval *tv) 11528 { 11529 int32_t thflags, retval; 11530 uint32_t cts, lcts; 11531 uint32_t tiwin; 11532 struct tcpopt to; 11533 struct tcp_bbr *bbr; 11534 struct bbr_sendmap *rsm; 11535 struct timeval ltv; 11536 int32_t did_out = 0; 11537 int32_t in_recovery; 11538 uint16_t nsegs; 11539 int32_t prev_state; 11540 uint32_t lost; 11541 11542 nsegs = max(1, m->m_pkthdr.lro_nsegs); 11543 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 11544 /* add in our stats */ 11545 kern_prefetch(bbr, &prev_state); 11546 prev_state = 0; 11547 thflags = th->th_flags; 11548 /* 11549 * If this is either a state-changing packet or current state isn't 11550 * established, we require a write lock on tcbinfo. Otherwise, we 11551 * allow the tcbinfo to be in either alocked or unlocked, as the 11552 * caller may have unnecessarily acquired a write lock due to a 11553 * race. 11554 */ 11555 INP_WLOCK_ASSERT(tp->t_inpcb); 11556 KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN", 11557 __func__)); 11558 KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT", 11559 __func__)); 11560 11561 tp->t_rcvtime = ticks; 11562 /* 11563 * Unscale the window into a 32-bit value. For the SYN_SENT state 11564 * the scale is zero. 11565 */ 11566 tiwin = th->th_win << tp->snd_scale; 11567 #ifdef STATS 11568 stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin); 11569 #endif 11570 /* 11571 * Parse options on any incoming segment. 11572 */ 11573 tcp_dooptions(&to, (u_char *)(th + 1), 11574 (th->th_off << 2) - sizeof(struct tcphdr), 11575 (thflags & TH_SYN) ? TO_SYN : 0); 11576 11577 if (m->m_flags & M_TSTMP) { 11578 /* Prefer the hardware timestamp if present */ 11579 struct timespec ts; 11580 11581 mbuf_tstmp2timespec(m, &ts); 11582 bbr->rc_tv.tv_sec = ts.tv_sec; 11583 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11584 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11585 } else if (m->m_flags & M_TSTMP_LRO) { 11586 /* Next the arrival timestamp */ 11587 struct timespec ts; 11588 11589 mbuf_tstmp2timespec(m, &ts); 11590 bbr->rc_tv.tv_sec = ts.tv_sec; 11591 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11592 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11593 } else { 11594 /* 11595 * Ok just get the current time. 11596 */ 11597 bbr->r_ctl.rc_rcvtime = lcts = cts = tcp_get_usecs(&bbr->rc_tv); 11598 } 11599 /* 11600 * If echoed timestamp is later than the current time, fall back to 11601 * non RFC1323 RTT calculation. Normalize timestamp if syncookies 11602 * were used when this connection was established. 11603 */ 11604 if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) { 11605 to.to_tsecr -= tp->ts_offset; 11606 if (TSTMP_GT(to.to_tsecr, tcp_tv_to_mssectick(&bbr->rc_tv))) 11607 to.to_tsecr = 0; 11608 } 11609 /* 11610 * If its the first time in we need to take care of options and 11611 * verify we can do SACK for rack! 11612 */ 11613 if (bbr->r_state == 0) { 11614 /* 11615 * Process options only when we get SYN/ACK back. The SYN 11616 * case for incoming connections is handled in tcp_syncache. 11617 * According to RFC1323 the window field in a SYN (i.e., a 11618 * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX 11619 * this is traditional behavior, may need to be cleaned up. 11620 */ 11621 if (bbr->rc_inp == NULL) { 11622 bbr->rc_inp = tp->t_inpcb; 11623 } 11624 /* 11625 * We need to init rc_inp here since its not init'd when 11626 * bbr_init is called 11627 */ 11628 if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { 11629 if ((to.to_flags & TOF_SCALE) && 11630 (tp->t_flags & TF_REQ_SCALE)) { 11631 tp->t_flags |= TF_RCVD_SCALE; 11632 tp->snd_scale = to.to_wscale; 11633 } 11634 /* 11635 * Initial send window. It will be updated with the 11636 * next incoming segment to the scaled value. 11637 */ 11638 tp->snd_wnd = th->th_win; 11639 if (to.to_flags & TOF_TS) { 11640 tp->t_flags |= TF_RCVD_TSTMP; 11641 tp->ts_recent = to.to_tsval; 11642 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 11643 } 11644 if (to.to_flags & TOF_MSS) 11645 tcp_mss(tp, to.to_mss); 11646 if ((tp->t_flags & TF_SACK_PERMIT) && 11647 (to.to_flags & TOF_SACKPERM) == 0) 11648 tp->t_flags &= ~TF_SACK_PERMIT; 11649 if (IS_FASTOPEN(tp->t_flags)) { 11650 if (to.to_flags & TOF_FASTOPEN) { 11651 uint16_t mss; 11652 11653 if (to.to_flags & TOF_MSS) 11654 mss = to.to_mss; 11655 else 11656 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) 11657 mss = TCP6_MSS; 11658 else 11659 mss = TCP_MSS; 11660 tcp_fastopen_update_cache(tp, mss, 11661 to.to_tfo_len, to.to_tfo_cookie); 11662 } else 11663 tcp_fastopen_disable_path(tp); 11664 } 11665 } 11666 /* 11667 * At this point we are at the initial call. Here we decide 11668 * if we are doing RACK or not. We do this by seeing if 11669 * TF_SACK_PERMIT is set, if not rack is *not* possible and 11670 * we switch to the default code. 11671 */ 11672 if ((tp->t_flags & TF_SACK_PERMIT) == 0) { 11673 /* Bail */ 11674 tcp_switch_back_to_default(tp); 11675 (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen, 11676 tlen, iptos); 11677 return (1); 11678 } 11679 /* Set the flag */ 11680 bbr->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; 11681 tcp_set_hpts(tp->t_inpcb); 11682 sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack); 11683 } 11684 if (thflags & TH_ACK) { 11685 /* Track ack types */ 11686 if (to.to_flags & TOF_SACK) 11687 BBR_STAT_INC(bbr_acks_with_sacks); 11688 else 11689 BBR_STAT_INC(bbr_plain_acks); 11690 } 11691 /* 11692 * This is the one exception case where we set the rack state 11693 * always. All other times (timers etc) we must have a rack-state 11694 * set (so we assure we have done the checks above for SACK). 11695 */ 11696 if (bbr->r_state != tp->t_state) 11697 bbr_set_state(tp, bbr, tiwin); 11698 11699 if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map)) != NULL) 11700 kern_prefetch(rsm, &prev_state); 11701 prev_state = bbr->r_state; 11702 bbr->rc_ack_was_delayed = 0; 11703 lost = bbr->r_ctl.rc_lost; 11704 bbr->rc_is_pkt_epoch_now = 0; 11705 if (m->m_flags & (M_TSTMP|M_TSTMP_LRO)) { 11706 /* Get the real time into lcts and figure the real delay */ 11707 lcts = tcp_get_usecs(<v); 11708 if (TSTMP_GT(lcts, cts)) { 11709 bbr->r_ctl.rc_ack_hdwr_delay = lcts - cts; 11710 bbr->rc_ack_was_delayed = 1; 11711 if (TSTMP_GT(bbr->r_ctl.rc_ack_hdwr_delay, 11712 bbr->r_ctl.highest_hdwr_delay)) 11713 bbr->r_ctl.highest_hdwr_delay = bbr->r_ctl.rc_ack_hdwr_delay; 11714 } else { 11715 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11716 bbr->rc_ack_was_delayed = 0; 11717 } 11718 } else { 11719 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11720 bbr->rc_ack_was_delayed = 0; 11721 } 11722 bbr_log_ack_event(bbr, th, &to, tlen, nsegs, cts, nxt_pkt, m); 11723 if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { 11724 retval = 0; 11725 m_freem(m); 11726 goto done_with_input; 11727 } 11728 /* 11729 * If a segment with the ACK-bit set arrives in the SYN-SENT state 11730 * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. 11731 */ 11732 if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && 11733 (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { 11734 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 11735 return (1); 11736 } 11737 in_recovery = IN_RECOVERY(tp->t_flags); 11738 if (tiwin > bbr->r_ctl.rc_high_rwnd) 11739 bbr->r_ctl.rc_high_rwnd = tiwin; 11740 #ifdef BBR_INVARIANTS 11741 if ((tp->t_inpcb->inp_flags & INP_DROPPED) || 11742 (tp->t_inpcb->inp_flags2 & INP_FREED)) { 11743 panic("tp:%p bbr:%p given a dropped inp:%p", 11744 tp, bbr, tp->t_inpcb); 11745 } 11746 #endif 11747 bbr->r_ctl.rc_flight_at_input = ctf_flight_size(tp, 11748 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11749 bbr->rtt_valid = 0; 11750 if (to.to_flags & TOF_TS) { 11751 bbr->rc_ts_valid = 1; 11752 bbr->r_ctl.last_inbound_ts = to.to_tsval; 11753 } else { 11754 bbr->rc_ts_valid = 0; 11755 bbr->r_ctl.last_inbound_ts = 0; 11756 } 11757 retval = (*bbr->r_substate) (m, th, so, 11758 tp, &to, drop_hdrlen, 11759 tlen, tiwin, thflags, nxt_pkt); 11760 #ifdef BBR_INVARIANTS 11761 if ((retval == 0) && 11762 (tp->t_inpcb == NULL)) { 11763 panic("retval:%d tp:%p t_inpcb:NULL state:%d", 11764 retval, tp, prev_state); 11765 } 11766 #endif 11767 if (nxt_pkt == 0) 11768 BBR_STAT_INC(bbr_rlock_left_ret0); 11769 else 11770 BBR_STAT_INC(bbr_rlock_left_ret1); 11771 if (retval == 0) { 11772 /* 11773 * If retval is 1 the tcb is unlocked and most likely the tp 11774 * is gone. 11775 */ 11776 INP_WLOCK_ASSERT(tp->t_inpcb); 11777 tcp_bbr_xmit_timer_commit(bbr, tp, cts); 11778 if (bbr->rc_is_pkt_epoch_now) 11779 bbr_set_pktepoch(bbr, cts, __LINE__); 11780 bbr_check_bbr_for_state(bbr, cts, __LINE__, (bbr->r_ctl.rc_lost - lost)); 11781 if (nxt_pkt == 0) { 11782 if (bbr->r_wanted_output != 0) { 11783 bbr->rc_output_starts_timer = 0; 11784 did_out = 1; 11785 (void)tp->t_fb->tfb_tcp_output(tp); 11786 } else 11787 bbr_start_hpts_timer(bbr, tp, cts, 6, 0, 0); 11788 } 11789 if ((nxt_pkt == 0) && 11790 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && 11791 (SEQ_GT(tp->snd_max, tp->snd_una) || 11792 (tp->t_flags & TF_DELACK) || 11793 ((V_tcp_always_keepalive || bbr->rc_inp->inp_socket->so_options & SO_KEEPALIVE) && 11794 (tp->t_state <= TCPS_CLOSING)))) { 11795 /* 11796 * We could not send (probably in the hpts but 11797 * stopped the timer)? 11798 */ 11799 if ((tp->snd_max == tp->snd_una) && 11800 ((tp->t_flags & TF_DELACK) == 0) && 11801 (bbr->rc_inp->inp_in_hpts) && 11802 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 11803 /* 11804 * keep alive not needed if we are hptsi 11805 * output yet 11806 */ 11807 ; 11808 } else { 11809 if (bbr->rc_inp->inp_in_hpts) { 11810 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 11811 if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 11812 (TSTMP_GT(lcts, bbr->rc_pacer_started))) { 11813 uint32_t del; 11814 11815 del = lcts - bbr->rc_pacer_started; 11816 if (bbr->r_ctl.rc_last_delay_val > del) { 11817 BBR_STAT_INC(bbr_force_timer_start); 11818 bbr->r_ctl.rc_last_delay_val -= del; 11819 bbr->rc_pacer_started = lcts; 11820 } else { 11821 /* We are late */ 11822 bbr->r_ctl.rc_last_delay_val = 0; 11823 BBR_STAT_INC(bbr_force_output); 11824 (void)tp->t_fb->tfb_tcp_output(tp); 11825 } 11826 } 11827 } 11828 bbr_start_hpts_timer(bbr, tp, cts, 8, bbr->r_ctl.rc_last_delay_val, 11829 0); 11830 } 11831 } else if ((bbr->rc_output_starts_timer == 0) && (nxt_pkt == 0)) { 11832 /* Do we have the correct timer running? */ 11833 bbr_timer_audit(tp, bbr, lcts, &so->so_snd); 11834 } 11835 /* Do we have a new state */ 11836 if (bbr->r_state != tp->t_state) 11837 bbr_set_state(tp, bbr, tiwin); 11838 done_with_input: 11839 bbr_log_doseg_done(bbr, cts, nxt_pkt, did_out); 11840 if (did_out) 11841 bbr->r_wanted_output = 0; 11842 #ifdef BBR_INVARIANTS 11843 if (tp->t_inpcb == NULL) { 11844 panic("OP:%d retval:%d tp:%p t_inpcb:NULL state:%d", 11845 did_out, 11846 retval, tp, prev_state); 11847 } 11848 #endif 11849 } 11850 return (retval); 11851 } 11852 11853 static void 11854 bbr_log_type_hrdwtso(struct tcpcb *tp, struct tcp_bbr *bbr, int len, int mod, int what_we_can_send) 11855 { 11856 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 11857 union tcp_log_stackspecific log; 11858 struct timeval tv; 11859 uint32_t cts; 11860 11861 cts = tcp_get_usecs(&tv); 11862 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 11863 log.u_bbr.flex1 = bbr->r_ctl.rc_pace_min_segs; 11864 log.u_bbr.flex2 = what_we_can_send; 11865 log.u_bbr.flex3 = bbr->r_ctl.rc_pace_max_segs; 11866 log.u_bbr.flex4 = len; 11867 log.u_bbr.flex5 = 0; 11868 log.u_bbr.flex7 = mod; 11869 log.u_bbr.flex8 = 1; 11870 TCP_LOG_EVENTP(tp, NULL, 11871 &tp->t_inpcb->inp_socket->so_rcv, 11872 &tp->t_inpcb->inp_socket->so_snd, 11873 TCP_HDWR_TLS, 0, 11874 0, &log, false, &tv); 11875 } 11876 } 11877 11878 static void 11879 bbr_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, 11880 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos) 11881 { 11882 struct timeval tv; 11883 int retval; 11884 11885 /* First lets see if we have old packets */ 11886 if (tp->t_in_pkt) { 11887 if (ctf_do_queued_segments(so, tp, 1)) { 11888 m_freem(m); 11889 return; 11890 } 11891 } 11892 if (m->m_flags & M_TSTMP_LRO) { 11893 tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; 11894 tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; 11895 } else { 11896 /* Should not be should we kassert instead? */ 11897 tcp_get_usecs(&tv); 11898 } 11899 retval = bbr_do_segment_nounlock(m, th, so, tp, 11900 drop_hdrlen, tlen, iptos, 0, &tv); 11901 if (retval == 0) 11902 INP_WUNLOCK(tp->t_inpcb); 11903 } 11904 11905 /* 11906 * Return how much data can be sent without violating the 11907 * cwnd or rwnd. 11908 */ 11909 11910 static inline uint32_t 11911 bbr_what_can_we_send(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t sendwin, 11912 uint32_t avail, int32_t sb_offset, uint32_t cts) 11913 { 11914 uint32_t len; 11915 11916 if (ctf_outstanding(tp) >= tp->snd_wnd) { 11917 /* We never want to go over our peers rcv-window */ 11918 len = 0; 11919 } else { 11920 uint32_t flight; 11921 11922 flight = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11923 if (flight >= sendwin) { 11924 /* 11925 * We have in flight what we are allowed by cwnd (if 11926 * it was rwnd blocking it would have hit above out 11927 * >= tp->snd_wnd). 11928 */ 11929 return (0); 11930 } 11931 len = sendwin - flight; 11932 if ((len + ctf_outstanding(tp)) > tp->snd_wnd) { 11933 /* We would send too much (beyond the rwnd) */ 11934 len = tp->snd_wnd - ctf_outstanding(tp); 11935 } 11936 if ((len + sb_offset) > avail) { 11937 /* 11938 * We don't have that much in the SB, how much is 11939 * there? 11940 */ 11941 len = avail - sb_offset; 11942 } 11943 } 11944 return (len); 11945 } 11946 11947 static inline void 11948 bbr_do_error_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11949 { 11950 #ifdef NETFLIX_STATS 11951 TCPSTAT_INC(tcps_sndpack_error); 11952 TCPSTAT_ADD(tcps_sndbyte_error, len); 11953 #endif 11954 } 11955 11956 static inline void 11957 bbr_do_send_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11958 { 11959 if (error) { 11960 bbr_do_error_accounting(tp, bbr, rsm, len, error); 11961 return; 11962 } 11963 if ((tp->t_flags & TF_FORCEDATA) && len == 1) { 11964 /* Window probe */ 11965 TCPSTAT_INC(tcps_sndprobe); 11966 #ifdef STATS 11967 stats_voi_update_abs_u32(tp->t_stats, 11968 VOI_TCP_RETXPB, len); 11969 #endif 11970 } else if (rsm) { 11971 if (rsm->r_flags & BBR_TLP) { 11972 /* 11973 * TLP should not count in retran count, but in its 11974 * own bin 11975 */ 11976 #ifdef NETFLIX_STATS 11977 tp->t_sndtlppack++; 11978 tp->t_sndtlpbyte += len; 11979 TCPSTAT_INC(tcps_tlpresends); 11980 TCPSTAT_ADD(tcps_tlpresend_bytes, len); 11981 #endif 11982 } else { 11983 /* Retransmit */ 11984 tp->t_sndrexmitpack++; 11985 TCPSTAT_INC(tcps_sndrexmitpack); 11986 TCPSTAT_ADD(tcps_sndrexmitbyte, len); 11987 #ifdef STATS 11988 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB, 11989 len); 11990 #endif 11991 } 11992 /* 11993 * Logs in 0 - 8, 8 is all non probe_bw states 0-7 is 11994 * sub-state 11995 */ 11996 counter_u64_add(bbr_state_lost[rsm->r_bbr_state], len); 11997 if (bbr->rc_bbr_state != BBR_STATE_PROBE_BW) { 11998 /* Non probe_bw log in 1, 2, or 4. */ 11999 counter_u64_add(bbr_state_resend[bbr->rc_bbr_state], len); 12000 } else { 12001 /* 12002 * Log our probe state 3, and log also 5-13 to show 12003 * us the recovery sub-state for the send. This 12004 * means that 3 == (5+6+7+8+9+10+11+12+13) 12005 */ 12006 counter_u64_add(bbr_state_resend[BBR_STATE_PROBE_BW], len); 12007 counter_u64_add(bbr_state_resend[(bbr_state_val(bbr) + 5)], len); 12008 } 12009 /* Place in both 16's the totals of retransmitted */ 12010 counter_u64_add(bbr_state_lost[16], len); 12011 counter_u64_add(bbr_state_resend[16], len); 12012 /* Place in 17's the total sent */ 12013 counter_u64_add(bbr_state_resend[17], len); 12014 counter_u64_add(bbr_state_lost[17], len); 12015 12016 } else { 12017 /* New sends */ 12018 TCPSTAT_INC(tcps_sndpack); 12019 TCPSTAT_ADD(tcps_sndbyte, len); 12020 /* Place in 17's the total sent */ 12021 counter_u64_add(bbr_state_resend[17], len); 12022 counter_u64_add(bbr_state_lost[17], len); 12023 #ifdef STATS 12024 stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB, 12025 len); 12026 #endif 12027 } 12028 } 12029 12030 static void 12031 bbr_cwnd_limiting(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t in_level) 12032 { 12033 if (bbr->rc_filled_pipe && bbr_target_cwnd_mult_limit && (bbr->rc_use_google == 0)) { 12034 /* 12035 * Limit the cwnd to not be above N x the target plus whats 12036 * is outstanding. The target is based on the current b/w 12037 * estimate. 12038 */ 12039 uint32_t target; 12040 12041 target = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), BBR_UNIT); 12042 target += ctf_outstanding(tp); 12043 target *= bbr_target_cwnd_mult_limit; 12044 if (tp->snd_cwnd > target) 12045 tp->snd_cwnd = target; 12046 bbr_log_type_cwndupd(bbr, 0, 0, 0, 10, 0, 0, __LINE__); 12047 } 12048 } 12049 12050 static int 12051 bbr_window_update_needed(struct tcpcb *tp, struct socket *so, uint32_t recwin, int32_t maxseg) 12052 { 12053 /* 12054 * "adv" is the amount we could increase the window, taking into 12055 * account that we are limited by TCP_MAXWIN << tp->rcv_scale. 12056 */ 12057 uint32_t adv; 12058 int32_t oldwin; 12059 12060 adv = min(recwin, TCP_MAXWIN << tp->rcv_scale); 12061 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) { 12062 oldwin = (tp->rcv_adv - tp->rcv_nxt); 12063 adv -= oldwin; 12064 } else 12065 oldwin = 0; 12066 12067 /* 12068 * If the new window size ends up being the same as the old size 12069 * when it is scaled, then don't force a window update. 12070 */ 12071 if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale) 12072 return (0); 12073 12074 if (adv >= (2 * maxseg) && 12075 (adv >= (so->so_rcv.sb_hiwat / 4) || 12076 recwin <= (so->so_rcv.sb_hiwat / 8) || 12077 so->so_rcv.sb_hiwat <= 8 * maxseg)) { 12078 return (1); 12079 } 12080 if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) 12081 return (1); 12082 return (0); 12083 } 12084 12085 /* 12086 * Return 0 on success and a errno on failure to send. 12087 * Note that a 0 return may not mean we sent anything 12088 * if the TCB was on the hpts. A non-zero return 12089 * does indicate the error we got from ip[6]_output. 12090 */ 12091 static int 12092 bbr_output_wtime(struct tcpcb *tp, const struct timeval *tv) 12093 { 12094 struct socket *so; 12095 int32_t len; 12096 uint32_t cts; 12097 uint32_t recwin, sendwin; 12098 int32_t sb_offset; 12099 int32_t flags, abandon, error = 0; 12100 struct tcp_log_buffer *lgb = NULL; 12101 struct mbuf *m; 12102 struct mbuf *mb; 12103 uint32_t if_hw_tsomaxsegcount = 0; 12104 uint32_t if_hw_tsomaxsegsize = 0; 12105 uint32_t if_hw_tsomax = 0; 12106 struct ip *ip = NULL; 12107 #ifdef TCPDEBUG 12108 struct ipovly *ipov = NULL; 12109 #endif 12110 struct tcp_bbr *bbr; 12111 struct tcphdr *th; 12112 #ifdef NETFLIX_TCPOUDP 12113 struct udphdr *udp = NULL; 12114 #endif 12115 u_char opt[TCP_MAXOLEN]; 12116 unsigned ipoptlen, optlen, hdrlen; 12117 #ifdef NETFLIX_TCPOUDP 12118 unsigned ulen; 12119 #endif 12120 uint32_t bbr_seq; 12121 uint32_t delay_calc=0; 12122 uint8_t doing_tlp = 0; 12123 uint8_t local_options; 12124 #ifdef BBR_INVARIANTS 12125 uint8_t doing_retran_from = 0; 12126 uint8_t picked_up_retran = 0; 12127 #endif 12128 uint8_t wanted_cookie = 0; 12129 uint8_t more_to_rxt=0; 12130 int32_t prefetch_so_done = 0; 12131 int32_t prefetch_rsm = 0; 12132 uint32_t what_we_can = 0; 12133 uint32_t tot_len = 0; 12134 uint32_t rtr_cnt = 0; 12135 uint32_t maxseg, pace_max_segs, p_maxseg; 12136 int32_t csum_flags; 12137 int32_t hw_tls; 12138 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12139 unsigned ipsec_optlen = 0; 12140 12141 #endif 12142 volatile int32_t sack_rxmit; 12143 struct bbr_sendmap *rsm = NULL; 12144 int32_t tso, mtu; 12145 int force_tso = 0; 12146 struct tcpopt to; 12147 int32_t slot = 0; 12148 struct inpcb *inp; 12149 struct sockbuf *sb; 12150 uint32_t hpts_calling; 12151 #ifdef INET6 12152 struct ip6_hdr *ip6 = NULL; 12153 int32_t isipv6; 12154 #endif 12155 uint8_t app_limited = BBR_JR_SENT_DATA; 12156 uint8_t filled_all = 0; 12157 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 12158 /* We take a cache hit here */ 12159 memcpy(&bbr->rc_tv, tv, sizeof(struct timeval)); 12160 cts = tcp_tv_to_usectick(&bbr->rc_tv); 12161 inp = bbr->rc_inp; 12162 so = inp->inp_socket; 12163 sb = &so->so_snd; 12164 #ifdef KERN_TLS 12165 if (sb->sb_flags & SB_TLS_IFNET) 12166 hw_tls = 1; 12167 else 12168 #endif 12169 hw_tls = 0; 12170 kern_prefetch(sb, &maxseg); 12171 maxseg = tp->t_maxseg - bbr->rc_last_options; 12172 if (bbr_minseg(bbr) < maxseg) { 12173 tcp_bbr_tso_size_check(bbr, cts); 12174 } 12175 /* Remove any flags that indicate we are pacing on the inp */ 12176 pace_max_segs = bbr->r_ctl.rc_pace_max_segs; 12177 p_maxseg = min(maxseg, pace_max_segs); 12178 INP_WLOCK_ASSERT(inp); 12179 #ifdef TCP_OFFLOAD 12180 if (tp->t_flags & TF_TOE) 12181 return (tcp_offload_output(tp)); 12182 #endif 12183 12184 #ifdef INET6 12185 if (bbr->r_state) { 12186 /* Use the cache line loaded if possible */ 12187 isipv6 = bbr->r_is_v6; 12188 } else { 12189 isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 12190 } 12191 #endif 12192 if (((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) && 12193 inp->inp_in_hpts) { 12194 /* 12195 * We are on the hpts for some timer but not hptsi output. 12196 * Possibly remove from the hpts so we can send/recv etc. 12197 */ 12198 if ((tp->t_flags & TF_ACKNOW) == 0) { 12199 /* 12200 * No immediate demand right now to send an ack, but 12201 * the user may have read, making room for new data 12202 * (a window update). If so we may want to cancel 12203 * whatever timer is running (KEEP/DEL-ACK?) and 12204 * continue to send out a window update. Or we may 12205 * have gotten more data into the socket buffer to 12206 * send. 12207 */ 12208 recwin = min(max(sbspace(&so->so_rcv), 0), 12209 TCP_MAXWIN << tp->rcv_scale); 12210 if ((bbr_window_update_needed(tp, so, recwin, maxseg) == 0) && 12211 ((sbavail(sb) + ((tcp_outflags[tp->t_state] & TH_FIN) ? 1 : 0)) <= 12212 (tp->snd_max - tp->snd_una))) { 12213 /* 12214 * Nothing new to send and no window update 12215 * is needed to send. Lets just return and 12216 * let the timer-run off. 12217 */ 12218 return (0); 12219 } 12220 } 12221 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12222 bbr_timer_cancel(bbr, __LINE__, cts); 12223 } 12224 if (bbr->r_ctl.rc_last_delay_val) { 12225 /* Calculate a rough delay for early escape to sending */ 12226 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12227 delay_calc = cts - bbr->rc_pacer_started; 12228 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12229 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12230 else 12231 delay_calc = 0; 12232 } 12233 /* Mark that we have called bbr_output(). */ 12234 if ((bbr->r_timer_override) || 12235 (tp->t_flags & TF_FORCEDATA) || 12236 (tp->t_state < TCPS_ESTABLISHED)) { 12237 /* Timeouts or early states are exempt */ 12238 if (inp->inp_in_hpts) 12239 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12240 } else if (inp->inp_in_hpts) { 12241 if ((bbr->r_ctl.rc_last_delay_val) && 12242 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 12243 delay_calc) { 12244 /* 12245 * We were being paced for output and the delay has 12246 * already exceeded when we were supposed to be 12247 * called, lets go ahead and pull out of the hpts 12248 * and call output. 12249 */ 12250 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_LATE], 1); 12251 bbr->r_ctl.rc_last_delay_val = 0; 12252 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12253 } else if (tp->t_state == TCPS_CLOSED) { 12254 bbr->r_ctl.rc_last_delay_val = 0; 12255 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12256 } else { 12257 /* 12258 * On the hpts, you shall not pass! even if ACKNOW 12259 * is on, we will when the hpts fires, unless of 12260 * course we are overdue. 12261 */ 12262 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_INPACE], 1); 12263 return (0); 12264 } 12265 } 12266 bbr->rc_cwnd_limited = 0; 12267 if (bbr->r_ctl.rc_last_delay_val) { 12268 /* recalculate the real delay and deal with over/under */ 12269 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12270 delay_calc = cts - bbr->rc_pacer_started; 12271 else 12272 delay_calc = 0; 12273 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12274 /* Setup the delay which will be added in */ 12275 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12276 else { 12277 /* 12278 * We are early setup to adjust 12279 * our slot time. 12280 */ 12281 uint64_t merged_val; 12282 12283 bbr->r_ctl.rc_agg_early += (bbr->r_ctl.rc_last_delay_val - delay_calc); 12284 bbr->r_agg_early_set = 1; 12285 if (bbr->r_ctl.rc_hptsi_agg_delay) { 12286 if (bbr->r_ctl.rc_hptsi_agg_delay >= bbr->r_ctl.rc_agg_early) { 12287 /* Nope our previous late cancels out the early */ 12288 bbr->r_ctl.rc_hptsi_agg_delay -= bbr->r_ctl.rc_agg_early; 12289 bbr->r_agg_early_set = 0; 12290 bbr->r_ctl.rc_agg_early = 0; 12291 } else { 12292 bbr->r_ctl.rc_agg_early -= bbr->r_ctl.rc_hptsi_agg_delay; 12293 bbr->r_ctl.rc_hptsi_agg_delay = 0; 12294 } 12295 } 12296 merged_val = bbr->rc_pacer_started; 12297 merged_val <<= 32; 12298 merged_val |= bbr->r_ctl.rc_last_delay_val; 12299 bbr_log_pacing_delay_calc(bbr, inp->inp_hpts_calls, 12300 bbr->r_ctl.rc_agg_early, cts, delay_calc, merged_val, 12301 bbr->r_agg_early_set, 3); 12302 bbr->r_ctl.rc_last_delay_val = 0; 12303 BBR_STAT_INC(bbr_early); 12304 delay_calc = 0; 12305 } 12306 } else { 12307 /* We were not delayed due to hptsi */ 12308 if (bbr->r_agg_early_set) 12309 bbr->r_ctl.rc_agg_early = 0; 12310 bbr->r_agg_early_set = 0; 12311 delay_calc = 0; 12312 } 12313 if (delay_calc) { 12314 /* 12315 * We had a hptsi delay which means we are falling behind on 12316 * sending at the expected rate. Calculate an extra amount 12317 * of data we can send, if any, to put us back on track. 12318 */ 12319 if ((bbr->r_ctl.rc_hptsi_agg_delay + delay_calc) < bbr->r_ctl.rc_hptsi_agg_delay) 12320 bbr->r_ctl.rc_hptsi_agg_delay = 0xffffffff; 12321 else 12322 bbr->r_ctl.rc_hptsi_agg_delay += delay_calc; 12323 } 12324 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12325 if ((tp->snd_una == tp->snd_max) && 12326 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 12327 (sbavail(sb))) { 12328 /* 12329 * Ok we have been idle with nothing outstanding 12330 * we possibly need to start fresh with either a new 12331 * suite of states or a fast-ramp up. 12332 */ 12333 bbr_restart_after_idle(bbr, 12334 cts, bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time)); 12335 } 12336 /* 12337 * Now was there a hptsi delay where we are behind? We only count 12338 * being behind if: a) We are not in recovery. b) There was a delay. 12339 * <and> c) We had room to send something. 12340 * 12341 */ 12342 hpts_calling = inp->inp_hpts_calls; 12343 inp->inp_hpts_calls = 0; 12344 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 12345 if (bbr_process_timers(tp, bbr, cts, hpts_calling)) { 12346 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_ATIMER], 1); 12347 return (0); 12348 } 12349 } 12350 bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 12351 if (hpts_calling && 12352 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 12353 bbr->r_ctl.rc_last_delay_val = 0; 12354 } 12355 bbr->r_timer_override = 0; 12356 bbr->r_wanted_output = 0; 12357 /* 12358 * For TFO connections in SYN_RECEIVED, only allow the initial 12359 * SYN|ACK and those sent by the retransmit timer. 12360 */ 12361 if (IS_FASTOPEN(tp->t_flags) && 12362 ((tp->t_state == TCPS_SYN_RECEIVED) || 12363 (tp->t_state == TCPS_SYN_SENT)) && 12364 SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN or SYN|ACK sent */ 12365 (tp->t_rxtshift == 0)) { /* not a retransmit */ 12366 return (0); 12367 } 12368 /* 12369 * Before sending anything check for a state update. For hpts 12370 * calling without input this is important. If its input calling 12371 * then this was already done. 12372 */ 12373 if (bbr->rc_use_google == 0) 12374 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 12375 again: 12376 /* 12377 * If we've recently taken a timeout, snd_max will be greater than 12378 * snd_max. BBR in general does not pay much attention to snd_nxt 12379 * for historic reasons the persist timer still uses it. This means 12380 * we have to look at it. All retransmissions that are not persits 12381 * use the rsm that needs to be sent so snd_nxt is ignored. At the 12382 * end of this routine we pull snd_nxt always up to snd_max. 12383 */ 12384 doing_tlp = 0; 12385 #ifdef BBR_INVARIANTS 12386 doing_retran_from = picked_up_retran = 0; 12387 #endif 12388 error = 0; 12389 tso = 0; 12390 slot = 0; 12391 mtu = 0; 12392 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12393 sb_offset = tp->snd_max - tp->snd_una; 12394 flags = tcp_outflags[tp->t_state]; 12395 sack_rxmit = 0; 12396 len = 0; 12397 rsm = NULL; 12398 if (flags & TH_RST) { 12399 SOCKBUF_LOCK(sb); 12400 goto send; 12401 } 12402 recheck_resend: 12403 while (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { 12404 /* We need to always have one in reserve */ 12405 rsm = bbr_alloc(bbr); 12406 if (rsm == NULL) { 12407 error = ENOMEM; 12408 /* Lie to get on the hpts */ 12409 tot_len = tp->t_maxseg; 12410 if (hpts_calling) 12411 /* Retry in a ms */ 12412 slot = 1001; 12413 goto just_return_nolock; 12414 } 12415 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); 12416 bbr->r_ctl.rc_free_cnt++; 12417 rsm = NULL; 12418 } 12419 /* What do we send, a resend? */ 12420 if (bbr->r_ctl.rc_resend == NULL) { 12421 /* Check for rack timeout */ 12422 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 12423 if (bbr->r_ctl.rc_resend) { 12424 #ifdef BBR_INVARIANTS 12425 picked_up_retran = 1; 12426 #endif 12427 bbr_cong_signal(tp, NULL, CC_NDUPACK, bbr->r_ctl.rc_resend); 12428 } 12429 } 12430 if (bbr->r_ctl.rc_resend) { 12431 rsm = bbr->r_ctl.rc_resend; 12432 #ifdef BBR_INVARIANTS 12433 doing_retran_from = 1; 12434 #endif 12435 /* Remove any TLP flags its a RACK or T-O */ 12436 rsm->r_flags &= ~BBR_TLP; 12437 bbr->r_ctl.rc_resend = NULL; 12438 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 12439 #ifdef BBR_INVARIANTS 12440 panic("Huh, tp:%p bbr:%p rsm:%p start:%u < snd_una:%u\n", 12441 tp, bbr, rsm, rsm->r_start, tp->snd_una); 12442 goto recheck_resend; 12443 #else 12444 /* TSNH */ 12445 rsm = NULL; 12446 goto recheck_resend; 12447 #endif 12448 } 12449 rtr_cnt++; 12450 if (rsm->r_flags & BBR_HAS_SYN) { 12451 /* Only retransmit a SYN by itself */ 12452 len = 0; 12453 if ((flags & TH_SYN) == 0) { 12454 /* Huh something is wrong */ 12455 rsm->r_start++; 12456 if (rsm->r_start == rsm->r_end) { 12457 /* Clean it up, somehow we missed the ack? */ 12458 bbr_log_syn(tp, NULL); 12459 } else { 12460 /* TFO with data? */ 12461 rsm->r_flags &= ~BBR_HAS_SYN; 12462 len = rsm->r_end - rsm->r_start; 12463 } 12464 } else { 12465 /* Retransmitting SYN */ 12466 rsm = NULL; 12467 SOCKBUF_LOCK(sb); 12468 goto send; 12469 } 12470 } else 12471 len = rsm->r_end - rsm->r_start; 12472 if ((bbr->rc_resends_use_tso == 0) && 12473 #ifdef KERN_TLS 12474 ((sb->sb_flags & SB_TLS_IFNET) == 0) && 12475 #endif 12476 (len > maxseg)) { 12477 len = maxseg; 12478 more_to_rxt = 1; 12479 } 12480 sb_offset = rsm->r_start - tp->snd_una; 12481 if (len > 0) { 12482 sack_rxmit = 1; 12483 TCPSTAT_INC(tcps_sack_rexmits); 12484 TCPSTAT_ADD(tcps_sack_rexmit_bytes, 12485 min(len, maxseg)); 12486 } else { 12487 /* I dont think this can happen */ 12488 rsm = NULL; 12489 goto recheck_resend; 12490 } 12491 BBR_STAT_INC(bbr_resends_set); 12492 } else if (bbr->r_ctl.rc_tlp_send) { 12493 /* 12494 * Tail loss probe 12495 */ 12496 doing_tlp = 1; 12497 rsm = bbr->r_ctl.rc_tlp_send; 12498 bbr->r_ctl.rc_tlp_send = NULL; 12499 sack_rxmit = 1; 12500 len = rsm->r_end - rsm->r_start; 12501 rtr_cnt++; 12502 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12503 len = maxseg; 12504 12505 if (SEQ_GT(tp->snd_una, rsm->r_start)) { 12506 #ifdef BBR_INVARIANTS 12507 panic("tp:%p bbc:%p snd_una:%u rsm:%p r_start:%u", 12508 tp, bbr, tp->snd_una, rsm, rsm->r_start); 12509 #else 12510 /* TSNH */ 12511 rsm = NULL; 12512 goto recheck_resend; 12513 #endif 12514 } 12515 sb_offset = rsm->r_start - tp->snd_una; 12516 BBR_STAT_INC(bbr_tlp_set); 12517 } 12518 /* 12519 * Enforce a connection sendmap count limit if set 12520 * as long as we are not retransmiting. 12521 */ 12522 if ((rsm == NULL) && 12523 (V_tcp_map_entries_limit > 0) && 12524 (bbr->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) { 12525 BBR_STAT_INC(bbr_alloc_limited); 12526 if (!bbr->alloc_limit_reported) { 12527 bbr->alloc_limit_reported = 1; 12528 BBR_STAT_INC(bbr_alloc_limited_conns); 12529 } 12530 goto just_return_nolock; 12531 } 12532 #ifdef BBR_INVARIANTS 12533 if (rsm && SEQ_LT(rsm->r_start, tp->snd_una)) { 12534 panic("tp:%p bbr:%p rsm:%p sb_offset:%u len:%u", 12535 tp, bbr, rsm, sb_offset, len); 12536 } 12537 #endif 12538 /* 12539 * Get standard flags, and add SYN or FIN if requested by 'hidden' 12540 * state flags. 12541 */ 12542 if (tp->t_flags & TF_NEEDFIN && (rsm == NULL)) 12543 flags |= TH_FIN; 12544 if (tp->t_flags & TF_NEEDSYN) 12545 flags |= TH_SYN; 12546 12547 if (rsm && (rsm->r_flags & BBR_HAS_FIN)) { 12548 /* we are retransmitting the fin */ 12549 len--; 12550 if (len) { 12551 /* 12552 * When retransmitting data do *not* include the 12553 * FIN. This could happen from a TLP probe if we 12554 * allowed data with a FIN. 12555 */ 12556 flags &= ~TH_FIN; 12557 } 12558 } else if (rsm) { 12559 if (flags & TH_FIN) 12560 flags &= ~TH_FIN; 12561 } 12562 if ((sack_rxmit == 0) && (prefetch_rsm == 0)) { 12563 void *end_rsm; 12564 12565 end_rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); 12566 if (end_rsm) 12567 kern_prefetch(end_rsm, &prefetch_rsm); 12568 prefetch_rsm = 1; 12569 } 12570 SOCKBUF_LOCK(sb); 12571 /* 12572 * If in persist timeout with window of 0, send 1 byte. Otherwise, 12573 * if window is small but nonzero and time TF_SENTFIN expired, we 12574 * will send what we can and go to transmit state. 12575 */ 12576 if (tp->t_flags & TF_FORCEDATA) { 12577 if ((sendwin == 0) || (sendwin <= (tp->snd_max - tp->snd_una))) { 12578 /* 12579 * If we still have some data to send, then clear 12580 * the FIN bit. Usually this would happen below 12581 * when it realizes that we aren't sending all the 12582 * data. However, if we have exactly 1 byte of 12583 * unsent data, then it won't clear the FIN bit 12584 * below, and if we are in persist state, we wind up 12585 * sending the packet without recording that we sent 12586 * the FIN bit. 12587 * 12588 * We can't just blindly clear the FIN bit, because 12589 * if we don't have any more data to send then the 12590 * probe will be the FIN itself. 12591 */ 12592 if (sb_offset < sbused(sb)) 12593 flags &= ~TH_FIN; 12594 sendwin = 1; 12595 } else { 12596 if ((bbr->rc_in_persist != 0) && 12597 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 12598 bbr_minseg(bbr)))) { 12599 /* Exit persists if there is space */ 12600 bbr_exit_persist(tp, bbr, cts, __LINE__); 12601 } 12602 if (rsm == NULL) { 12603 /* 12604 * If we are dropping persist mode then we 12605 * need to correct sb_offset if not a 12606 * retransmit. 12607 */ 12608 sb_offset = tp->snd_max - tp->snd_una; 12609 } 12610 } 12611 } 12612 /* 12613 * If snd_nxt == snd_max and we have transmitted a FIN, the 12614 * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a 12615 * negative length. This can also occur when TCP opens up its 12616 * congestion window while receiving additional duplicate acks after 12617 * fast-retransmit because TCP will reset snd_nxt to snd_max after 12618 * the fast-retransmit. 12619 * 12620 * In the normal retransmit-FIN-only case, however, snd_nxt will be 12621 * set to snd_una, the sb_offset will be 0, and the length may wind 12622 * up 0. 12623 * 12624 * If sack_rxmit is true we are retransmitting from the scoreboard 12625 * in which case len is already set. 12626 */ 12627 if (sack_rxmit == 0) { 12628 uint32_t avail; 12629 12630 avail = sbavail(sb); 12631 if (SEQ_GT(tp->snd_max, tp->snd_una)) 12632 sb_offset = tp->snd_max - tp->snd_una; 12633 else 12634 sb_offset = 0; 12635 if (bbr->rc_tlp_new_data) { 12636 /* TLP is forcing out new data */ 12637 uint32_t tlplen; 12638 12639 doing_tlp = 1; 12640 tlplen = maxseg; 12641 12642 if (tlplen > (uint32_t)(avail - sb_offset)) { 12643 tlplen = (uint32_t)(avail - sb_offset); 12644 } 12645 if (tlplen > tp->snd_wnd) { 12646 len = tp->snd_wnd; 12647 } else { 12648 len = tlplen; 12649 } 12650 bbr->rc_tlp_new_data = 0; 12651 } else { 12652 what_we_can = len = bbr_what_can_we_send(tp, bbr, sendwin, avail, sb_offset, cts); 12653 if ((len < p_maxseg) && 12654 (bbr->rc_in_persist == 0) && 12655 (ctf_outstanding(tp) >= (2 * p_maxseg)) && 12656 ((avail - sb_offset) >= p_maxseg)) { 12657 /* 12658 * We are not completing whats in the socket 12659 * buffer (i.e. there is at least a segment 12660 * waiting to send) and we have 2 or more 12661 * segments outstanding. There is no sense 12662 * of sending a little piece. Lets defer and 12663 * and wait until we can send a whole 12664 * segment. 12665 */ 12666 len = 0; 12667 } 12668 if ((tp->t_flags & TF_FORCEDATA) && (bbr->rc_in_persist)) { 12669 /* 12670 * We are in persists, figure out if 12671 * a retransmit is available (maybe the previous 12672 * persists we sent) or if we have to send new 12673 * data. 12674 */ 12675 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 12676 if (rsm) { 12677 len = rsm->r_end - rsm->r_start; 12678 if (rsm->r_flags & BBR_HAS_FIN) 12679 len--; 12680 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12681 len = maxseg; 12682 if (len > 1) 12683 BBR_STAT_INC(bbr_persist_reneg); 12684 /* 12685 * XXXrrs we could force the len to 12686 * 1 byte here to cause the chunk to 12687 * split apart.. but that would then 12688 * mean we always retransmit it as 12689 * one byte even after the window 12690 * opens. 12691 */ 12692 sack_rxmit = 1; 12693 sb_offset = rsm->r_start - tp->snd_una; 12694 } else { 12695 /* 12696 * First time through in persists or peer 12697 * acked our one byte. Though we do have 12698 * to have something in the sb. 12699 */ 12700 len = 1; 12701 sb_offset = 0; 12702 if (avail == 0) 12703 len = 0; 12704 } 12705 } 12706 } 12707 } 12708 if (prefetch_so_done == 0) { 12709 kern_prefetch(so, &prefetch_so_done); 12710 prefetch_so_done = 1; 12711 } 12712 /* 12713 * Lop off SYN bit if it has already been sent. However, if this is 12714 * SYN-SENT state and if segment contains data and if we don't know 12715 * that foreign host supports TAO, suppress sending segment. 12716 */ 12717 if ((flags & TH_SYN) && (rsm == NULL) && 12718 SEQ_GT(tp->snd_max, tp->snd_una)) { 12719 if (tp->t_state != TCPS_SYN_RECEIVED) 12720 flags &= ~TH_SYN; 12721 /* 12722 * When sending additional segments following a TFO SYN|ACK, 12723 * do not include the SYN bit. 12724 */ 12725 if (IS_FASTOPEN(tp->t_flags) && 12726 (tp->t_state == TCPS_SYN_RECEIVED)) 12727 flags &= ~TH_SYN; 12728 sb_offset--, len++; 12729 if (sbavail(sb) == 0) 12730 len = 0; 12731 } else if ((flags & TH_SYN) && rsm) { 12732 /* 12733 * Subtract one from the len for the SYN being 12734 * retransmitted. 12735 */ 12736 len--; 12737 } 12738 /* 12739 * Be careful not to send data and/or FIN on SYN segments. This 12740 * measure is needed to prevent interoperability problems with not 12741 * fully conformant TCP implementations. 12742 */ 12743 if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) { 12744 len = 0; 12745 flags &= ~TH_FIN; 12746 } 12747 /* 12748 * On TFO sockets, ensure no data is sent in the following cases: 12749 * 12750 * - When retransmitting SYN|ACK on a passively-created socket 12751 * - When retransmitting SYN on an actively created socket 12752 * - When sending a zero-length cookie (cookie request) on an 12753 * actively created socket 12754 * - When the socket is in the CLOSED state (RST is being sent) 12755 */ 12756 if (IS_FASTOPEN(tp->t_flags) && 12757 (((flags & TH_SYN) && (tp->t_rxtshift > 0)) || 12758 ((tp->t_state == TCPS_SYN_SENT) && 12759 (tp->t_tfo_client_cookie_len == 0)) || 12760 (flags & TH_RST))) { 12761 len = 0; 12762 sack_rxmit = 0; 12763 rsm = NULL; 12764 } 12765 /* Without fast-open there should never be data sent on a SYN */ 12766 if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) 12767 len = 0; 12768 if (len <= 0) { 12769 /* 12770 * If FIN has been sent but not acked, but we haven't been 12771 * called to retransmit, len will be < 0. Otherwise, window 12772 * shrank after we sent into it. If window shrank to 0, 12773 * cancel pending retransmit, pull snd_nxt back to (closed) 12774 * window, and set the persist timer if it isn't already 12775 * going. If the window didn't close completely, just wait 12776 * for an ACK. 12777 * 12778 * We also do a general check here to ensure that we will 12779 * set the persist timer when we have data to send, but a 12780 * 0-byte window. This makes sure the persist timer is set 12781 * even if the packet hits one of the "goto send" lines 12782 * below. 12783 */ 12784 len = 0; 12785 if ((tp->snd_wnd == 0) && 12786 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12787 (tp->snd_una == tp->snd_max) && 12788 (sb_offset < (int)sbavail(sb))) { 12789 /* 12790 * Not enough room in the rwnd to send 12791 * a paced segment out. 12792 */ 12793 bbr_enter_persist(tp, bbr, cts, __LINE__); 12794 } 12795 } else if ((rsm == NULL) && 12796 (doing_tlp == 0) && 12797 (len < bbr->r_ctl.rc_pace_max_segs)) { 12798 /* 12799 * We are not sending a full segment for 12800 * some reason. Should we not send anything (think 12801 * sws or persists)? 12802 */ 12803 if ((tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12804 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12805 (len < (int)(sbavail(sb) - sb_offset))) { 12806 /* 12807 * Here the rwnd is less than 12808 * the pacing size, this is not a retransmit, 12809 * we are established and 12810 * the send is not the last in the socket buffer 12811 * lets not send, and possibly enter persists. 12812 */ 12813 len = 0; 12814 if (tp->snd_max == tp->snd_una) 12815 bbr_enter_persist(tp, bbr, cts, __LINE__); 12816 } else if ((tp->snd_cwnd >= bbr->r_ctl.rc_pace_max_segs) && 12817 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12818 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12819 (len < (int)(sbavail(sb) - sb_offset)) && 12820 (len < bbr_minseg(bbr))) { 12821 /* 12822 * Here we are not retransmitting, and 12823 * the cwnd is not so small that we could 12824 * not send at least a min size (rxt timer 12825 * not having gone off), We have 2 segments or 12826 * more already in flight, its not the tail end 12827 * of the socket buffer and the cwnd is blocking 12828 * us from sending out minimum pacing segment size. 12829 * Lets not send anything. 12830 */ 12831 bbr->rc_cwnd_limited = 1; 12832 len = 0; 12833 } else if (((tp->snd_wnd - ctf_outstanding(tp)) < 12834 min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12835 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12836 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12837 (len < (int)(sbavail(sb) - sb_offset)) && 12838 (TCPS_HAVEESTABLISHED(tp->t_state))) { 12839 /* 12840 * Here we have a send window but we have 12841 * filled it up and we can't send another pacing segment. 12842 * We also have in flight more than 2 segments 12843 * and we are not completing the sb i.e. we allow 12844 * the last bytes of the sb to go out even if 12845 * its not a full pacing segment. 12846 */ 12847 len = 0; 12848 } 12849 } 12850 /* len will be >= 0 after this point. */ 12851 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 12852 tcp_sndbuf_autoscale(tp, so, sendwin); 12853 /* 12854 * 12855 */ 12856 if (bbr->rc_in_persist && 12857 len && 12858 (rsm == NULL) && 12859 (len < min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs))) { 12860 /* 12861 * We are in persist, not doing a retransmit and don't have enough space 12862 * yet to send a full TSO. So is it at the end of the sb 12863 * if so we need to send else nuke to 0 and don't send. 12864 */ 12865 int sbleft; 12866 if (sbavail(sb) > sb_offset) 12867 sbleft = sbavail(sb) - sb_offset; 12868 else 12869 sbleft = 0; 12870 if (sbleft >= min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs)) { 12871 /* not at end of sb lets not send */ 12872 len = 0; 12873 } 12874 } 12875 /* 12876 * Decide if we can use TCP Segmentation Offloading (if supported by 12877 * hardware). 12878 * 12879 * TSO may only be used if we are in a pure bulk sending state. The 12880 * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP 12881 * options prevent using TSO. With TSO the TCP header is the same 12882 * (except for the sequence number) for all generated packets. This 12883 * makes it impossible to transmit any options which vary per 12884 * generated segment or packet. 12885 * 12886 * IPv4 handling has a clear separation of ip options and ip header 12887 * flags while IPv6 combines both in in6p_outputopts. ip6_optlen() 12888 * does the right thing below to provide length of just ip options 12889 * and thus checking for ipoptlen is enough to decide if ip options 12890 * are present. 12891 */ 12892 #ifdef INET6 12893 if (isipv6) 12894 ipoptlen = ip6_optlen(inp); 12895 else 12896 #endif 12897 if (inp->inp_options) 12898 ipoptlen = inp->inp_options->m_len - 12899 offsetof(struct ipoption, ipopt_list); 12900 else 12901 ipoptlen = 0; 12902 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12903 /* 12904 * Pre-calculate here as we save another lookup into the darknesses 12905 * of IPsec that way and can actually decide if TSO is ok. 12906 */ 12907 #ifdef INET6 12908 if (isipv6 && IPSEC_ENABLED(ipv6)) 12909 ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp); 12910 #ifdef INET 12911 else 12912 #endif 12913 #endif /* INET6 */ 12914 #ifdef INET 12915 if (IPSEC_ENABLED(ipv4)) 12916 ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp); 12917 #endif /* INET */ 12918 #endif /* IPSEC */ 12919 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12920 ipoptlen += ipsec_optlen; 12921 #endif 12922 if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && 12923 (len > maxseg) && 12924 (tp->t_port == 0) && 12925 ((tp->t_flags & TF_SIGNATURE) == 0) && 12926 tp->rcv_numsacks == 0 && 12927 ipoptlen == 0) 12928 tso = 1; 12929 12930 recwin = min(max(sbspace(&so->so_rcv), 0), 12931 TCP_MAXWIN << tp->rcv_scale); 12932 /* 12933 * Sender silly window avoidance. We transmit under the following 12934 * conditions when len is non-zero: 12935 * 12936 * - We have a full segment (or more with TSO) - This is the last 12937 * buffer in a write()/send() and we are either idle or running 12938 * NODELAY - we've timed out (e.g. persist timer) - we have more 12939 * then 1/2 the maximum send window's worth of data (receiver may be 12940 * limited the window size) - we need to retransmit 12941 */ 12942 if (rsm) 12943 goto send; 12944 if (len) { 12945 if (sack_rxmit) 12946 goto send; 12947 if (len >= p_maxseg) 12948 goto send; 12949 /* 12950 * NOTE! on localhost connections an 'ack' from the remote 12951 * end may occur synchronously with the output and cause us 12952 * to flush a buffer queued with moretocome. XXX 12953 * 12954 */ 12955 if (((tp->t_flags & TF_MORETOCOME) == 0) && /* normal case */ 12956 ((tp->t_flags & TF_NODELAY) || 12957 ((uint32_t)len + (uint32_t)sb_offset) >= sbavail(&so->so_snd)) && 12958 (tp->t_flags & TF_NOPUSH) == 0) { 12959 goto send; 12960 } 12961 if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */ 12962 goto send; 12963 } 12964 if (tp->t_flags & TF_FORCEDATA) { /* typ. timeout case */ 12965 goto send; 12966 } 12967 if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) { 12968 goto send; 12969 } 12970 } 12971 /* 12972 * Sending of standalone window updates. 12973 * 12974 * Window updates are important when we close our window due to a 12975 * full socket buffer and are opening it again after the application 12976 * reads data from it. Once the window has opened again and the 12977 * remote end starts to send again the ACK clock takes over and 12978 * provides the most current window information. 12979 * 12980 * We must avoid the silly window syndrome whereas every read from 12981 * the receive buffer, no matter how small, causes a window update 12982 * to be sent. We also should avoid sending a flurry of window 12983 * updates when the socket buffer had queued a lot of data and the 12984 * application is doing small reads. 12985 * 12986 * Prevent a flurry of pointless window updates by only sending an 12987 * update when we can increase the advertized window by more than 12988 * 1/4th of the socket buffer capacity. When the buffer is getting 12989 * full or is very small be more aggressive and send an update 12990 * whenever we can increase by two mss sized segments. In all other 12991 * situations the ACK's to new incoming data will carry further 12992 * window increases. 12993 * 12994 * Don't send an independent window update if a delayed ACK is 12995 * pending (it will get piggy-backed on it) or the remote side 12996 * already has done a half-close and won't send more data. Skip 12997 * this if the connection is in T/TCP half-open state. 12998 */ 12999 if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) && 13000 !(tp->t_flags & TF_DELACK) && 13001 !TCPS_HAVERCVDFIN(tp->t_state)) { 13002 /* Check to see if we should do a window update */ 13003 if (bbr_window_update_needed(tp, so, recwin, maxseg)) 13004 goto send; 13005 } 13006 /* 13007 * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW 13008 * is also a catch-all for the retransmit timer timeout case. 13009 */ 13010 if (tp->t_flags & TF_ACKNOW) { 13011 goto send; 13012 } 13013 if (((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) { 13014 goto send; 13015 } 13016 if (SEQ_GT(tp->snd_up, tp->snd_una)) { 13017 goto send; 13018 } 13019 /* 13020 * If our state indicates that FIN should be sent and we have not 13021 * yet done so, then we need to send. 13022 */ 13023 if (flags & TH_FIN && 13024 ((tp->t_flags & TF_SENTFIN) == 0)) { 13025 goto send; 13026 } 13027 /* 13028 * No reason to send a segment, just return. 13029 */ 13030 just_return: 13031 SOCKBUF_UNLOCK(sb); 13032 just_return_nolock: 13033 if (tot_len) 13034 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 13035 if (bbr->rc_no_pacing) 13036 slot = 0; 13037 if (tot_len == 0) { 13038 if ((ctf_outstanding(tp) + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) >= 13039 tp->snd_wnd) { 13040 BBR_STAT_INC(bbr_rwnd_limited); 13041 app_limited = BBR_JR_RWND_LIMITED; 13042 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 13043 if ((bbr->rc_in_persist == 0) && 13044 TCPS_HAVEESTABLISHED(tp->t_state) && 13045 (tp->snd_max == tp->snd_una) && 13046 sbavail(&tp->t_inpcb->inp_socket->so_snd)) { 13047 /* No send window.. we must enter persist */ 13048 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 13049 } 13050 } else if (ctf_outstanding(tp) >= sbavail(sb)) { 13051 BBR_STAT_INC(bbr_app_limited); 13052 app_limited = BBR_JR_APP_LIMITED; 13053 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 13054 } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 13055 bbr->r_ctl.rc_lost_bytes)) + p_maxseg) >= tp->snd_cwnd) { 13056 BBR_STAT_INC(bbr_cwnd_limited); 13057 app_limited = BBR_JR_CWND_LIMITED; 13058 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 13059 bbr->r_ctl.rc_lost_bytes))); 13060 bbr->rc_cwnd_limited = 1; 13061 } else { 13062 BBR_STAT_INC(bbr_app_limited); 13063 app_limited = BBR_JR_APP_LIMITED; 13064 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 13065 } 13066 bbr->r_ctl.rc_hptsi_agg_delay = 0; 13067 bbr->r_agg_early_set = 0; 13068 bbr->r_ctl.rc_agg_early = 0; 13069 bbr->r_ctl.rc_last_delay_val = 0; 13070 } else if (bbr->rc_use_google == 0) 13071 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 13072 /* Are we app limited? */ 13073 if ((app_limited == BBR_JR_APP_LIMITED) || 13074 (app_limited == BBR_JR_RWND_LIMITED)) { 13075 /** 13076 * We are application limited. 13077 */ 13078 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 13079 bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_delivered); 13080 } 13081 if (tot_len == 0) 13082 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_JUSTRET], 1); 13083 tp->t_flags &= ~TF_FORCEDATA; 13084 /* Dont update the time if we did not send */ 13085 bbr->r_ctl.rc_last_delay_val = 0; 13086 bbr->rc_output_starts_timer = 1; 13087 bbr_start_hpts_timer(bbr, tp, cts, 9, slot, tot_len); 13088 bbr_log_type_just_return(bbr, cts, tot_len, hpts_calling, app_limited, p_maxseg, len); 13089 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 13090 /* Make sure snd_nxt is drug up */ 13091 tp->snd_nxt = tp->snd_max; 13092 } 13093 return (error); 13094 13095 send: 13096 if (doing_tlp == 0) { 13097 /* 13098 * Data not a TLP, and its not the rxt firing. If it is the 13099 * rxt firing, we want to leave the tlp_in_progress flag on 13100 * so we don't send another TLP. It has to be a rack timer 13101 * or normal send (response to acked data) to clear the tlp 13102 * in progress flag. 13103 */ 13104 bbr->rc_tlp_in_progress = 0; 13105 bbr->rc_tlp_rtx_out = 0; 13106 } else { 13107 /* 13108 * Its a TLP. 13109 */ 13110 bbr->rc_tlp_in_progress = 1; 13111 } 13112 bbr_timer_cancel(bbr, __LINE__, cts); 13113 if (rsm == NULL) { 13114 if (sbused(sb) > 0) { 13115 /* 13116 * This is sub-optimal. We only send a stand alone 13117 * FIN on its own segment. 13118 */ 13119 if (flags & TH_FIN) { 13120 flags &= ~TH_FIN; 13121 if ((len == 0) && ((tp->t_flags & TF_ACKNOW) == 0)) { 13122 /* Lets not send this */ 13123 slot = 0; 13124 goto just_return; 13125 } 13126 } 13127 } 13128 } else { 13129 /* 13130 * We do *not* send a FIN on a retransmit if it has data. 13131 * The if clause here where len > 1 should never come true. 13132 */ 13133 if ((len > 0) && 13134 (((rsm->r_flags & BBR_HAS_FIN) == 0) && 13135 (flags & TH_FIN))) { 13136 flags &= ~TH_FIN; 13137 len--; 13138 } 13139 } 13140 SOCKBUF_LOCK_ASSERT(sb); 13141 if (len > 0) { 13142 if ((tp->snd_una == tp->snd_max) && 13143 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 13144 /* 13145 * This qualifies as a RTT_PROBE session since we 13146 * drop the data outstanding to nothing and waited 13147 * more than bbr_rtt_probe_time. 13148 */ 13149 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 13150 bbr_set_reduced_rtt(bbr, cts, __LINE__); 13151 } 13152 if (len >= maxseg) 13153 tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT; 13154 else 13155 tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT; 13156 } 13157 /* 13158 * Before ESTABLISHED, force sending of initial options unless TCP 13159 * set not to do any options. NOTE: we assume that the IP/TCP header 13160 * plus TCP options always fit in a single mbuf, leaving room for a 13161 * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr) 13162 * + optlen <= MCLBYTES 13163 */ 13164 optlen = 0; 13165 #ifdef INET6 13166 if (isipv6) 13167 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 13168 else 13169 #endif 13170 hdrlen = sizeof(struct tcpiphdr); 13171 13172 /* 13173 * Compute options for segment. We only have to care about SYN and 13174 * established connection segments. Options for SYN-ACK segments 13175 * are handled in TCP syncache. 13176 */ 13177 to.to_flags = 0; 13178 local_options = 0; 13179 if ((tp->t_flags & TF_NOOPT) == 0) { 13180 /* Maximum segment size. */ 13181 if (flags & TH_SYN) { 13182 to.to_mss = tcp_mssopt(&inp->inp_inc); 13183 #ifdef NETFLIX_TCPOUDP 13184 if (tp->t_port) 13185 to.to_mss -= V_tcp_udp_tunneling_overhead; 13186 #endif 13187 to.to_flags |= TOF_MSS; 13188 /* 13189 * On SYN or SYN|ACK transmits on TFO connections, 13190 * only include the TFO option if it is not a 13191 * retransmit, as the presence of the TFO option may 13192 * have caused the original SYN or SYN|ACK to have 13193 * been dropped by a middlebox. 13194 */ 13195 if (IS_FASTOPEN(tp->t_flags) && 13196 (tp->t_rxtshift == 0)) { 13197 if (tp->t_state == TCPS_SYN_RECEIVED) { 13198 to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN; 13199 to.to_tfo_cookie = 13200 (u_int8_t *)&tp->t_tfo_cookie.server; 13201 to.to_flags |= TOF_FASTOPEN; 13202 wanted_cookie = 1; 13203 } else if (tp->t_state == TCPS_SYN_SENT) { 13204 to.to_tfo_len = 13205 tp->t_tfo_client_cookie_len; 13206 to.to_tfo_cookie = 13207 tp->t_tfo_cookie.client; 13208 to.to_flags |= TOF_FASTOPEN; 13209 wanted_cookie = 1; 13210 } 13211 } 13212 } 13213 /* Window scaling. */ 13214 if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { 13215 to.to_wscale = tp->request_r_scale; 13216 to.to_flags |= TOF_SCALE; 13217 } 13218 /* Timestamps. */ 13219 if ((tp->t_flags & TF_RCVD_TSTMP) || 13220 ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { 13221 to.to_tsval = tcp_tv_to_mssectick(&bbr->rc_tv) + tp->ts_offset; 13222 to.to_tsecr = tp->ts_recent; 13223 to.to_flags |= TOF_TS; 13224 local_options += TCPOLEN_TIMESTAMP + 2; 13225 } 13226 /* Set receive buffer autosizing timestamp. */ 13227 if (tp->rfbuf_ts == 0 && 13228 (so->so_rcv.sb_flags & SB_AUTOSIZE)) 13229 tp->rfbuf_ts = tcp_tv_to_mssectick(&bbr->rc_tv); 13230 /* Selective ACK's. */ 13231 if (flags & TH_SYN) 13232 to.to_flags |= TOF_SACKPERM; 13233 else if (TCPS_HAVEESTABLISHED(tp->t_state) && 13234 tp->rcv_numsacks > 0) { 13235 to.to_flags |= TOF_SACK; 13236 to.to_nsacks = tp->rcv_numsacks; 13237 to.to_sacks = (u_char *)tp->sackblks; 13238 } 13239 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13240 /* TCP-MD5 (RFC2385). */ 13241 if (tp->t_flags & TF_SIGNATURE) 13242 to.to_flags |= TOF_SIGNATURE; 13243 #endif /* TCP_SIGNATURE */ 13244 13245 /* Processing the options. */ 13246 hdrlen += (optlen = tcp_addoptions(&to, opt)); 13247 /* 13248 * If we wanted a TFO option to be added, but it was unable 13249 * to fit, ensure no data is sent. 13250 */ 13251 if (IS_FASTOPEN(tp->t_flags) && wanted_cookie && 13252 !(to.to_flags & TOF_FASTOPEN)) 13253 len = 0; 13254 } 13255 #ifdef NETFLIX_TCPOUDP 13256 if (tp->t_port) { 13257 if (V_tcp_udp_tunneling_port == 0) { 13258 /* The port was removed?? */ 13259 SOCKBUF_UNLOCK(&so->so_snd); 13260 return (EHOSTUNREACH); 13261 } 13262 hdrlen += sizeof(struct udphdr); 13263 } 13264 #endif 13265 #ifdef INET6 13266 if (isipv6) 13267 ipoptlen = ip6_optlen(tp->t_inpcb); 13268 else 13269 #endif 13270 if (tp->t_inpcb->inp_options) 13271 ipoptlen = tp->t_inpcb->inp_options->m_len - 13272 offsetof(struct ipoption, ipopt_list); 13273 else 13274 ipoptlen = 0; 13275 ipoptlen = 0; 13276 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 13277 ipoptlen += ipsec_optlen; 13278 #endif 13279 if (bbr->rc_last_options != local_options) { 13280 /* 13281 * Cache the options length this generally does not change 13282 * on a connection. We use this to calculate TSO. 13283 */ 13284 bbr->rc_last_options = local_options; 13285 } 13286 maxseg = tp->t_maxseg - (ipoptlen + optlen); 13287 p_maxseg = min(maxseg, pace_max_segs); 13288 /* 13289 * Adjust data length if insertion of options will bump the packet 13290 * length beyond the t_maxseg length. Clear the FIN bit because we 13291 * cut off the tail of the segment. 13292 */ 13293 #ifdef KERN_TLS 13294 /* force TSO for so TLS offload can get mss */ 13295 if (sb->sb_flags & SB_TLS_IFNET) { 13296 force_tso = 1; 13297 } 13298 #endif 13299 13300 if (len > maxseg) { 13301 if (len != 0 && (flags & TH_FIN)) { 13302 flags &= ~TH_FIN; 13303 } 13304 if (tso) { 13305 uint32_t moff; 13306 int32_t max_len; 13307 13308 /* extract TSO information */ 13309 if_hw_tsomax = tp->t_tsomax; 13310 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount; 13311 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize; 13312 KASSERT(ipoptlen == 0, 13313 ("%s: TSO can't do IP options", __func__)); 13314 13315 /* 13316 * Check if we should limit by maximum payload 13317 * length: 13318 */ 13319 if (if_hw_tsomax != 0) { 13320 /* compute maximum TSO length */ 13321 max_len = (if_hw_tsomax - hdrlen - 13322 max_linkhdr); 13323 if (max_len <= 0) { 13324 len = 0; 13325 } else if (len > max_len) { 13326 len = max_len; 13327 } 13328 } 13329 /* 13330 * Prevent the last segment from being fractional 13331 * unless the send sockbuf can be emptied: 13332 */ 13333 if (((sb_offset + len) < sbavail(sb)) && 13334 (hw_tls == 0)) { 13335 moff = len % (uint32_t)maxseg; 13336 if (moff != 0) { 13337 len -= moff; 13338 } 13339 } 13340 /* 13341 * In case there are too many small fragments don't 13342 * use TSO: 13343 */ 13344 if (len <= maxseg) { 13345 len = maxseg; 13346 tso = 0; 13347 } 13348 } else { 13349 /* Not doing TSO */ 13350 if (optlen + ipoptlen >= tp->t_maxseg) { 13351 /* 13352 * Since we don't have enough space to put 13353 * the IP header chain and the TCP header in 13354 * one packet as required by RFC 7112, don't 13355 * send it. Also ensure that at least one 13356 * byte of the payload can be put into the 13357 * TCP segment. 13358 */ 13359 SOCKBUF_UNLOCK(&so->so_snd); 13360 error = EMSGSIZE; 13361 sack_rxmit = 0; 13362 goto out; 13363 } 13364 len = maxseg; 13365 } 13366 } else { 13367 /* Not doing TSO */ 13368 if_hw_tsomaxsegcount = 0; 13369 tso = 0; 13370 } 13371 KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET, 13372 ("%s: len > IP_MAXPACKET", __func__)); 13373 #ifdef DIAGNOSTIC 13374 #ifdef INET6 13375 if (max_linkhdr + hdrlen > MCLBYTES) 13376 #else 13377 if (max_linkhdr + hdrlen > MHLEN) 13378 #endif 13379 panic("tcphdr too big"); 13380 #endif 13381 /* 13382 * This KASSERT is here to catch edge cases at a well defined place. 13383 * Before, those had triggered (random) panic conditions further 13384 * down. 13385 */ 13386 #ifdef BBR_INVARIANTS 13387 if (sack_rxmit) { 13388 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 13389 panic("RSM:%p TP:%p bbr:%p start:%u is < snd_una:%u", 13390 rsm, tp, bbr, rsm->r_start, tp->snd_una); 13391 } 13392 } 13393 #endif 13394 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 13395 if ((len == 0) && 13396 (flags & TH_FIN) && 13397 (sbused(sb))) { 13398 /* 13399 * We have outstanding data, don't send a fin by itself!. 13400 */ 13401 slot = 0; 13402 goto just_return; 13403 } 13404 /* 13405 * Grab a header mbuf, attaching a copy of data to be transmitted, 13406 * and initialize the header from the template for sends on this 13407 * connection. 13408 */ 13409 if (len) { 13410 uint32_t moff; 13411 uint32_t orig_len; 13412 13413 /* 13414 * We place a limit on sending with hptsi. 13415 */ 13416 if ((rsm == NULL) && len > pace_max_segs) 13417 len = pace_max_segs; 13418 if (len <= maxseg) 13419 tso = 0; 13420 #ifdef INET6 13421 if (MHLEN < hdrlen + max_linkhdr) 13422 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 13423 else 13424 #endif 13425 m = m_gethdr(M_NOWAIT, MT_DATA); 13426 13427 if (m == NULL) { 13428 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13429 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13430 SOCKBUF_UNLOCK(sb); 13431 error = ENOBUFS; 13432 sack_rxmit = 0; 13433 goto out; 13434 } 13435 m->m_data += max_linkhdr; 13436 m->m_len = hdrlen; 13437 /* 13438 * Start the m_copy functions from the closest mbuf to the 13439 * sb_offset in the socket buffer chain. 13440 */ 13441 if ((sb_offset > sbavail(sb)) || ((len + sb_offset) > sbavail(sb))) { 13442 #ifdef BBR_INVARIANTS 13443 if ((len + sb_offset) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) 13444 panic("tp:%p bbr:%p len:%u sb_offset:%u sbavail:%u rsm:%p %u:%u:%u", 13445 tp, bbr, len, sb_offset, sbavail(sb), rsm, 13446 doing_retran_from, 13447 picked_up_retran, 13448 doing_tlp); 13449 13450 #endif 13451 /* 13452 * In this messed up situation we have two choices, 13453 * a) pretend the send worked, and just start timers 13454 * and what not (not good since that may lead us 13455 * back here a lot). <or> b) Send the lowest segment 13456 * in the map. <or> c) Drop the connection. Lets do 13457 * <b> which if it continues to happen will lead to 13458 * <c> via timeouts. 13459 */ 13460 BBR_STAT_INC(bbr_offset_recovery); 13461 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 13462 sb_offset = 0; 13463 if (rsm == NULL) { 13464 sack_rxmit = 0; 13465 len = sbavail(sb); 13466 } else { 13467 sack_rxmit = 1; 13468 if (rsm->r_start != tp->snd_una) { 13469 /* 13470 * Things are really messed up, <c> 13471 * is the only thing to do. 13472 */ 13473 BBR_STAT_INC(bbr_offset_drop); 13474 tcp_set_inp_to_drop(inp, EFAULT); 13475 return (0); 13476 } 13477 len = rsm->r_end - rsm->r_start; 13478 } 13479 if (len > sbavail(sb)) 13480 len = sbavail(sb); 13481 if (len > maxseg) 13482 len = maxseg; 13483 } 13484 mb = sbsndptr_noadv(sb, sb_offset, &moff); 13485 if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) { 13486 m_copydata(mb, moff, (int)len, 13487 mtod(m, caddr_t)+hdrlen); 13488 if (rsm == NULL) 13489 sbsndptr_adv(sb, mb, len); 13490 m->m_len += len; 13491 } else { 13492 struct sockbuf *msb; 13493 13494 if (rsm) 13495 msb = NULL; 13496 else 13497 msb = sb; 13498 #ifdef BBR_INVARIANTS 13499 if ((len + moff) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) { 13500 if (rsm) { 13501 panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u rsm:%p snd_una:%u rsm_start:%u flg:%x %u:%u:%u sr:%d ", 13502 tp, bbr, len, moff, 13503 sbavail(sb), rsm, 13504 tp->snd_una, rsm->r_flags, rsm->r_start, 13505 doing_retran_from, 13506 picked_up_retran, 13507 doing_tlp, sack_rxmit); 13508 } else { 13509 panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u sb_offset:%u snd_una:%u", 13510 tp, bbr, len, moff, sbavail(sb), sb_offset, tp->snd_una); 13511 } 13512 } 13513 #endif 13514 orig_len = len; 13515 m->m_next = tcp_m_copym( 13516 #ifdef NETFLIX_COPY_ARGS 13517 tp, 13518 #endif 13519 mb, moff, &len, 13520 if_hw_tsomaxsegcount, 13521 if_hw_tsomaxsegsize, msb, 13522 ((rsm == NULL) ? hw_tls : 0) 13523 #ifdef NETFLIX_COPY_ARGS 13524 , &filled_all 13525 #endif 13526 ); 13527 if (len <= maxseg && !force_tso) { 13528 /* 13529 * Must have ran out of mbufs for the copy 13530 * shorten it to no longer need tso. Lets 13531 * not put on sendalot since we are low on 13532 * mbufs. 13533 */ 13534 tso = 0; 13535 } 13536 if (m->m_next == NULL) { 13537 SOCKBUF_UNLOCK(sb); 13538 (void)m_free(m); 13539 error = ENOBUFS; 13540 sack_rxmit = 0; 13541 goto out; 13542 } 13543 } 13544 #ifdef BBR_INVARIANTS 13545 if (tso && len < maxseg) { 13546 panic("tp:%p tso on, but len:%d < maxseg:%d", 13547 tp, len, maxseg); 13548 } 13549 if (tso && if_hw_tsomaxsegcount) { 13550 int32_t seg_cnt = 0; 13551 struct mbuf *foo; 13552 13553 foo = m; 13554 while (foo) { 13555 seg_cnt++; 13556 foo = foo->m_next; 13557 } 13558 if (seg_cnt > if_hw_tsomaxsegcount) { 13559 panic("seg_cnt:%d > max:%d", seg_cnt, if_hw_tsomaxsegcount); 13560 } 13561 } 13562 #endif 13563 /* 13564 * If we're sending everything we've got, set PUSH. (This 13565 * will keep happy those implementations which only give 13566 * data to the user when a buffer fills or a PUSH comes in.) 13567 */ 13568 if (sb_offset + len == sbused(sb) && 13569 sbused(sb) && 13570 !(flags & TH_SYN)) { 13571 flags |= TH_PUSH; 13572 } 13573 SOCKBUF_UNLOCK(sb); 13574 } else { 13575 SOCKBUF_UNLOCK(sb); 13576 if (tp->t_flags & TF_ACKNOW) 13577 TCPSTAT_INC(tcps_sndacks); 13578 else if (flags & (TH_SYN | TH_FIN | TH_RST)) 13579 TCPSTAT_INC(tcps_sndctrl); 13580 else if (SEQ_GT(tp->snd_up, tp->snd_una)) 13581 TCPSTAT_INC(tcps_sndurg); 13582 else 13583 TCPSTAT_INC(tcps_sndwinup); 13584 13585 m = m_gethdr(M_NOWAIT, MT_DATA); 13586 if (m == NULL) { 13587 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13588 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13589 error = ENOBUFS; 13590 /* Fudge the send time since we could not send */ 13591 sack_rxmit = 0; 13592 goto out; 13593 } 13594 #ifdef INET6 13595 if (isipv6 && (MHLEN < hdrlen + max_linkhdr) && 13596 MHLEN >= hdrlen) { 13597 M_ALIGN(m, hdrlen); 13598 } else 13599 #endif 13600 m->m_data += max_linkhdr; 13601 m->m_len = hdrlen; 13602 } 13603 SOCKBUF_UNLOCK_ASSERT(sb); 13604 m->m_pkthdr.rcvif = (struct ifnet *)0; 13605 #ifdef MAC 13606 mac_inpcb_create_mbuf(inp, m); 13607 #endif 13608 #ifdef INET6 13609 if (isipv6) { 13610 ip6 = mtod(m, struct ip6_hdr *); 13611 #ifdef NETFLIX_TCPOUDP 13612 if (tp->t_port) { 13613 udp = (struct udphdr *)((caddr_t)ip6 + ipoptlen + sizeof(struct ip6_hdr)); 13614 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13615 udp->uh_dport = tp->t_port; 13616 ulen = hdrlen + len - sizeof(struct ip6_hdr); 13617 udp->uh_ulen = htons(ulen); 13618 th = (struct tcphdr *)(udp + 1); 13619 } else { 13620 #endif 13621 th = (struct tcphdr *)(ip6 + 1); 13622 13623 #ifdef NETFLIX_TCPOUDP 13624 } 13625 #endif 13626 tcpip_fillheaders(inp, 13627 #ifdef NETFLIX_TCPOUDP 13628 tp->t_port, 13629 #endif 13630 ip6, th); 13631 } else 13632 #endif /* INET6 */ 13633 { 13634 ip = mtod(m, struct ip *); 13635 #ifdef TCPDEBUG 13636 ipov = (struct ipovly *)ip; 13637 #endif 13638 #ifdef NETFLIX_TCPOUDP 13639 if (tp->t_port) { 13640 udp = (struct udphdr *)((caddr_t)ip + ipoptlen + sizeof(struct ip)); 13641 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13642 udp->uh_dport = tp->t_port; 13643 ulen = hdrlen + len - sizeof(struct ip); 13644 udp->uh_ulen = htons(ulen); 13645 th = (struct tcphdr *)(udp + 1); 13646 } else 13647 #endif 13648 th = (struct tcphdr *)(ip + 1); 13649 tcpip_fillheaders(inp, 13650 #ifdef NETFLIX_TCPOUDP 13651 tp->t_port, 13652 #endif 13653 ip, th); 13654 } 13655 /* 13656 * If we are doing retransmissions, then snd_nxt will not reflect 13657 * the first unsent octet. For ACK only packets, we do not want the 13658 * sequence number of the retransmitted packet, we want the sequence 13659 * number of the next unsent octet. So, if there is no data (and no 13660 * SYN or FIN), use snd_max instead of snd_nxt when filling in 13661 * ti_seq. But if we are in persist state, snd_max might reflect 13662 * one byte beyond the right edge of the window, so use snd_nxt in 13663 * that case, since we know we aren't doing a retransmission. 13664 * (retransmit and persist are mutually exclusive...) 13665 */ 13666 if (sack_rxmit == 0) { 13667 if (len && ((flags & (TH_FIN | TH_SYN | TH_RST)) == 0)) { 13668 /* New data (including new persists) */ 13669 th->th_seq = htonl(tp->snd_max); 13670 bbr_seq = tp->snd_max; 13671 } else if (flags & TH_SYN) { 13672 /* Syn's always send from iss */ 13673 th->th_seq = htonl(tp->iss); 13674 bbr_seq = tp->iss; 13675 } else if (flags & TH_FIN) { 13676 if (flags & TH_FIN && tp->t_flags & TF_SENTFIN) { 13677 /* 13678 * If we sent the fin already its 1 minus 13679 * snd_max 13680 */ 13681 th->th_seq = (htonl(tp->snd_max - 1)); 13682 bbr_seq = (tp->snd_max - 1); 13683 } else { 13684 /* First time FIN use snd_max */ 13685 th->th_seq = htonl(tp->snd_max); 13686 bbr_seq = tp->snd_max; 13687 } 13688 } else if (flags & TH_RST) { 13689 /* 13690 * For a Reset send the last cum ack in sequence 13691 * (this like any other choice may still generate a 13692 * challenge ack, if a ack-update packet is in 13693 * flight). 13694 */ 13695 th->th_seq = htonl(tp->snd_una); 13696 bbr_seq = tp->snd_una; 13697 } else { 13698 /* 13699 * len == 0 and not persist we use snd_max, sending 13700 * an ack unless we have sent the fin then its 1 13701 * minus. 13702 */ 13703 /* 13704 * XXXRRS Question if we are in persists and we have 13705 * nothing outstanding to send and we have not sent 13706 * a FIN, we will send an ACK. In such a case it 13707 * might be better to send (tp->snd_una - 1) which 13708 * would force the peer to ack. 13709 */ 13710 if (tp->t_flags & TF_SENTFIN) { 13711 th->th_seq = htonl(tp->snd_max - 1); 13712 bbr_seq = (tp->snd_max - 1); 13713 } else { 13714 th->th_seq = htonl(tp->snd_max); 13715 bbr_seq = tp->snd_max; 13716 } 13717 } 13718 } else { 13719 /* All retransmits use the rsm to guide the send */ 13720 th->th_seq = htonl(rsm->r_start); 13721 bbr_seq = rsm->r_start; 13722 } 13723 th->th_ack = htonl(tp->rcv_nxt); 13724 if (optlen) { 13725 bcopy(opt, th + 1, optlen); 13726 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2; 13727 } 13728 th->th_flags = flags; 13729 /* 13730 * Calculate receive window. Don't shrink window, but avoid silly 13731 * window syndrome. 13732 */ 13733 if ((flags & TH_RST) || ((recwin < (so->so_rcv.sb_hiwat / 4) && 13734 recwin < maxseg))) 13735 recwin = 0; 13736 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && 13737 recwin < (tp->rcv_adv - tp->rcv_nxt)) 13738 recwin = (tp->rcv_adv - tp->rcv_nxt); 13739 if (recwin > TCP_MAXWIN << tp->rcv_scale) 13740 recwin = TCP_MAXWIN << tp->rcv_scale; 13741 13742 /* 13743 * According to RFC1323 the window field in a SYN (i.e., a <SYN> or 13744 * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is 13745 * handled in syncache. 13746 */ 13747 if (flags & TH_SYN) 13748 th->th_win = htons((u_short) 13749 (min(sbspace(&so->so_rcv), TCP_MAXWIN))); 13750 else 13751 th->th_win = htons((u_short)(recwin >> tp->rcv_scale)); 13752 /* 13753 * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0 13754 * window. This may cause the remote transmitter to stall. This 13755 * flag tells soreceive() to disable delayed acknowledgements when 13756 * draining the buffer. This can occur if the receiver is 13757 * attempting to read more data than can be buffered prior to 13758 * transmitting on the connection. 13759 */ 13760 if (th->th_win == 0) { 13761 tp->t_sndzerowin++; 13762 tp->t_flags |= TF_RXWIN0SENT; 13763 } else 13764 tp->t_flags &= ~TF_RXWIN0SENT; 13765 if (SEQ_GT(tp->snd_up, tp->snd_max)) { 13766 th->th_urp = htons((u_short)(tp->snd_up - tp->snd_max)); 13767 th->th_flags |= TH_URG; 13768 } else 13769 /* 13770 * If no urgent pointer to send, then we pull the urgent 13771 * pointer to the left edge of the send window so that it 13772 * doesn't drift into the send window on sequence number 13773 * wraparound. 13774 */ 13775 tp->snd_up = tp->snd_una; /* drag it along */ 13776 13777 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13778 if (to.to_flags & TOF_SIGNATURE) { 13779 /* 13780 * Calculate MD5 signature and put it into the place 13781 * determined before. NOTE: since TCP options buffer doesn't 13782 * point into mbuf's data, calculate offset and use it. 13783 */ 13784 if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th, 13785 (u_char *)(th + 1) + (to.to_signature - opt)) != 0) { 13786 /* 13787 * Do not send segment if the calculation of MD5 13788 * digest has failed. 13789 */ 13790 goto out; 13791 } 13792 } 13793 #endif 13794 13795 /* 13796 * Put TCP length in extended header, and then checksum extended 13797 * header and data. 13798 */ 13799 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */ 13800 #ifdef INET6 13801 if (isipv6) { 13802 /* 13803 * ip6_plen is not need to be filled now, and will be filled 13804 * in ip6_output. 13805 */ 13806 #ifdef NETFLIX_TCPOUDP 13807 if (tp->t_port) { 13808 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 13809 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13810 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0); 13811 th->th_sum = htons(0); 13812 UDPSTAT_INC(udps_opackets); 13813 } else { 13814 #endif 13815 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; 13816 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13817 th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) + 13818 optlen + len, IPPROTO_TCP, 0); 13819 #ifdef NETFLIX_TCPOUDP 13820 } 13821 #endif 13822 } 13823 #endif 13824 #if defined(INET6) && defined(INET) 13825 else 13826 #endif 13827 #ifdef INET 13828 { 13829 #ifdef NETFLIX_TCPOUDP 13830 if (tp->t_port) { 13831 m->m_pkthdr.csum_flags = CSUM_UDP; 13832 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13833 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, 13834 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP)); 13835 th->th_sum = htons(0); 13836 UDPSTAT_INC(udps_opackets); 13837 } else { 13838 #endif 13839 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP; 13840 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13841 th->th_sum = in_pseudo(ip->ip_src.s_addr, 13842 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) + 13843 IPPROTO_TCP + len + optlen)); 13844 #ifdef NETFLIX_TCPOUDP 13845 } 13846 #endif 13847 /* IP version must be set here for ipv4/ipv6 checking later */ 13848 KASSERT(ip->ip_v == IPVERSION, 13849 ("%s: IP version incorrect: %d", __func__, ip->ip_v)); 13850 } 13851 #endif 13852 13853 /* 13854 * Enable TSO and specify the size of the segments. The TCP pseudo 13855 * header checksum is always provided. XXX: Fixme: This is currently 13856 * not the case for IPv6. 13857 */ 13858 if (tso || force_tso) { 13859 KASSERT(force_tso || len > maxseg, 13860 ("%s: len:%d <= tso_segsz:%d", __func__, len, maxseg)); 13861 m->m_pkthdr.csum_flags |= CSUM_TSO; 13862 csum_flags |= CSUM_TSO; 13863 m->m_pkthdr.tso_segsz = maxseg; 13864 } 13865 KASSERT(len + hdrlen == m_length(m, NULL), 13866 ("%s: mbuf chain different than expected: %d + %u != %u", 13867 __func__, len, hdrlen, m_length(m, NULL))); 13868 13869 #ifdef TCP_HHOOK 13870 /* Run HHOOK_TC_ESTABLISHED_OUT helper hooks. */ 13871 hhook_run_tcp_est_out(tp, th, &to, len, tso); 13872 #endif 13873 #ifdef TCPDEBUG 13874 /* 13875 * Trace. 13876 */ 13877 if (so->so_options & SO_DEBUG) { 13878 u_short save = 0; 13879 13880 #ifdef INET6 13881 if (!isipv6) 13882 #endif 13883 { 13884 save = ipov->ih_len; 13885 ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen + 13886 * (th->th_off << 2) */ ); 13887 } 13888 tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0); 13889 #ifdef INET6 13890 if (!isipv6) 13891 #endif 13892 ipov->ih_len = save; 13893 } 13894 #endif /* TCPDEBUG */ 13895 13896 /* Log to the black box */ 13897 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 13898 union tcp_log_stackspecific log; 13899 13900 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 13901 /* Record info on type of transmission */ 13902 log.u_bbr.flex1 = bbr->r_ctl.rc_hptsi_agg_delay; 13903 log.u_bbr.flex2 = (bbr->r_recovery_bw << 3); 13904 log.u_bbr.flex3 = maxseg; 13905 log.u_bbr.flex4 = delay_calc; 13906 /* Encode filled_all into the upper flex5 bit */ 13907 log.u_bbr.flex5 = bbr->rc_past_init_win; 13908 log.u_bbr.flex5 <<= 1; 13909 log.u_bbr.flex5 |= bbr->rc_no_pacing; 13910 log.u_bbr.flex5 <<= 29; 13911 if (filled_all) 13912 log.u_bbr.flex5 |= 0x80000000; 13913 log.u_bbr.flex5 |= tp->t_maxseg; 13914 log.u_bbr.flex6 = bbr->r_ctl.rc_pace_max_segs; 13915 log.u_bbr.flex7 = (bbr->rc_bbr_state << 8) | bbr_state_val(bbr); 13916 /* lets poke in the low and the high here for debugging */ 13917 log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; 13918 if (rsm || sack_rxmit) { 13919 if (doing_tlp) 13920 log.u_bbr.flex8 = 2; 13921 else 13922 log.u_bbr.flex8 = 1; 13923 } else { 13924 log.u_bbr.flex8 = 0; 13925 } 13926 lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK, 13927 len, &log, false, NULL, NULL, 0, tv); 13928 } else { 13929 lgb = NULL; 13930 } 13931 /* 13932 * Fill in IP length and desired time to live and send to IP level. 13933 * There should be a better way to handle ttl and tos; we could keep 13934 * them in the template, but need a way to checksum without them. 13935 */ 13936 /* 13937 * m->m_pkthdr.len should have been set before cksum calcuration, 13938 * because in6_cksum() need it. 13939 */ 13940 #ifdef INET6 13941 if (isipv6) { 13942 /* 13943 * we separately set hoplimit for every segment, since the 13944 * user might want to change the value via setsockopt. Also, 13945 * desired default hop limit might be changed via Neighbor 13946 * Discovery. 13947 */ 13948 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 13949 13950 /* 13951 * Set the packet size here for the benefit of DTrace 13952 * probes. ip6_output() will set it properly; it's supposed 13953 * to include the option header lengths as well. 13954 */ 13955 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 13956 13957 if (V_path_mtu_discovery && maxseg > V_tcp_minmss) 13958 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13959 else 13960 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 13961 13962 if (tp->t_state == TCPS_SYN_SENT) 13963 TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th); 13964 13965 TCP_PROBE5(send, NULL, tp, ip6, tp, th); 13966 /* TODO: IPv6 IP6TOS_ECT bit on */ 13967 error = ip6_output(m, inp->in6p_outputopts, 13968 &inp->inp_route6, 13969 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 13970 NULL, NULL, inp); 13971 13972 if (error == EMSGSIZE && inp->inp_route6.ro_rt != NULL) 13973 mtu = inp->inp_route6.ro_rt->rt_mtu; 13974 } 13975 #endif /* INET6 */ 13976 #if defined(INET) && defined(INET6) 13977 else 13978 #endif 13979 #ifdef INET 13980 { 13981 ip->ip_len = htons(m->m_pkthdr.len); 13982 #ifdef INET6 13983 if (isipv6) 13984 ip->ip_ttl = in6_selecthlim(inp, NULL); 13985 #endif /* INET6 */ 13986 /* 13987 * If we do path MTU discovery, then we set DF on every 13988 * packet. This might not be the best thing to do according 13989 * to RFC3390 Section 2. However the tcp hostcache migitates 13990 * the problem so it affects only the first tcp connection 13991 * with a host. 13992 * 13993 * NB: Don't set DF on small MTU/MSS to have a safe 13994 * fallback. 13995 */ 13996 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) { 13997 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13998 if (tp->t_port == 0 || len < V_tcp_minmss) { 13999 ip->ip_off |= htons(IP_DF); 14000 } 14001 } else { 14002 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 14003 } 14004 14005 if (tp->t_state == TCPS_SYN_SENT) 14006 TCP_PROBE5(connect__request, NULL, tp, ip, tp, th); 14007 14008 TCP_PROBE5(send, NULL, tp, ip, tp, th); 14009 14010 error = ip_output(m, inp->inp_options, &inp->inp_route, 14011 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0, 14012 inp); 14013 if (error == EMSGSIZE && inp->inp_route.ro_rt != NULL) 14014 mtu = inp->inp_route.ro_rt->rt_mtu; 14015 } 14016 #endif /* INET */ 14017 out: 14018 14019 if (lgb) { 14020 lgb->tlb_errno = error; 14021 lgb = NULL; 14022 } 14023 /* 14024 * In transmit state, time the transmission and arrange for the 14025 * retransmit. In persist state, just set snd_max. 14026 */ 14027 if (error == 0) { 14028 if (TCPS_HAVEESTABLISHED(tp->t_state) && 14029 (tp->t_flags & TF_SACK_PERMIT) && 14030 tp->rcv_numsacks > 0) 14031 tcp_clean_dsack_blocks(tp); 14032 /* We sent an ack clear the bbr_segs_rcvd count */ 14033 bbr->output_error_seen = 0; 14034 bbr->oerror_cnt = 0; 14035 bbr->bbr_segs_rcvd = 0; 14036 if (len == 0) 14037 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_SNDACK], 1); 14038 else if (hw_tls) { 14039 if (filled_all || 14040 (len >= bbr->r_ctl.rc_pace_max_segs)) 14041 BBR_STAT_INC(bbr_meets_tso_thresh); 14042 else { 14043 if (doing_tlp) { 14044 BBR_STAT_INC(bbr_miss_tlp); 14045 bbr_log_type_hrdwtso(tp, bbr, len, 1, what_we_can); 14046 14047 14048 } else if (rsm) { 14049 BBR_STAT_INC(bbr_miss_retran); 14050 bbr_log_type_hrdwtso(tp, bbr, len, 2, what_we_can); 14051 } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > sbavail(sb)) { 14052 BBR_STAT_INC(bbr_miss_tso_app); 14053 bbr_log_type_hrdwtso(tp, bbr, len, 3, what_we_can); 14054 } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 14055 bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_cwnd) { 14056 BBR_STAT_INC(bbr_miss_tso_cwnd); 14057 bbr_log_type_hrdwtso(tp, bbr, len, 4, what_we_can); 14058 } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_wnd) { 14059 BBR_STAT_INC(bbr_miss_tso_rwnd); 14060 bbr_log_type_hrdwtso(tp, bbr, len, 5, what_we_can); 14061 } else { 14062 BBR_STAT_INC(bbr_miss_unknown); 14063 bbr_log_type_hrdwtso(tp, bbr, len, 6, what_we_can); 14064 } 14065 } 14066 } 14067 /* Do accounting for new sends */ 14068 if ((len > 0) && (rsm == NULL)) { 14069 int idx; 14070 if (tp->snd_una == tp->snd_max) { 14071 /* 14072 * Special case to match google, when 14073 * nothing is in flight the delivered 14074 * time does get updated to the current 14075 * time (see tcp_rate_bsd.c). 14076 */ 14077 bbr->r_ctl.rc_del_time = cts; 14078 } 14079 if (len >= maxseg) { 14080 idx = (len / maxseg) + 3; 14081 if (idx >= TCP_MSS_ACCT_ATIMER) 14082 counter_u64_add(bbr_out_size[(TCP_MSS_ACCT_ATIMER - 1)], 1); 14083 else 14084 counter_u64_add(bbr_out_size[idx], 1); 14085 } else { 14086 /* smaller than a MSS */ 14087 idx = len / (bbr_hptsi_bytes_min - bbr->rc_last_options); 14088 if (idx >= TCP_MSS_SMALL_MAX_SIZE_DIV) 14089 idx = (TCP_MSS_SMALL_MAX_SIZE_DIV - 1); 14090 counter_u64_add(bbr_out_size[(idx + TCP_MSS_SMALL_SIZE_OFF)], 1); 14091 } 14092 } 14093 } 14094 abandon = 0; 14095 /* 14096 * We must do the send accounting before we log the output, 14097 * otherwise the state of the rsm could change and we account to the 14098 * wrong bucket. 14099 */ 14100 if (len > 0) { 14101 bbr_do_send_accounting(tp, bbr, rsm, len, error); 14102 if (error == 0) { 14103 if (tp->snd_una == tp->snd_max) 14104 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 14105 } 14106 } 14107 bbr_log_output(bbr, tp, &to, len, bbr_seq, (uint8_t) flags, error, 14108 cts, mb, &abandon, rsm, 0, sb); 14109 if (abandon) { 14110 /* 14111 * If bbr_log_output destroys the TCB or sees a TH_RST being 14112 * sent we should hit this condition. 14113 */ 14114 return (0); 14115 } 14116 if (((tp->t_flags & TF_FORCEDATA) == 0) || 14117 (bbr->rc_in_persist == 0)) { 14118 /* 14119 * Advance snd_nxt over sequence space of this segment. 14120 */ 14121 if (error) 14122 /* We don't log or do anything with errors */ 14123 goto skip_upd; 14124 14125 if (tp->snd_una == tp->snd_max && 14126 (len || (flags & (TH_SYN | TH_FIN)))) { 14127 /* 14128 * Update the time we just added data since none was 14129 * outstanding. 14130 */ 14131 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 14132 bbr->rc_tp->t_acktime = ticks; 14133 } 14134 if (flags & (TH_SYN | TH_FIN) && (rsm == NULL)) { 14135 if (flags & TH_SYN) { 14136 tp->snd_max++; 14137 } 14138 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 14139 tp->snd_max++; 14140 tp->t_flags |= TF_SENTFIN; 14141 } 14142 } 14143 if (sack_rxmit == 0) 14144 tp->snd_max += len; 14145 skip_upd: 14146 if ((error == 0) && len) 14147 tot_len += len; 14148 } else { 14149 /* Persists case */ 14150 int32_t xlen = len; 14151 14152 if (error) 14153 goto nomore; 14154 14155 if (flags & TH_SYN) 14156 ++xlen; 14157 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 14158 ++xlen; 14159 tp->t_flags |= TF_SENTFIN; 14160 } 14161 if (xlen && (tp->snd_una == tp->snd_max)) { 14162 /* 14163 * Update the time we just added data since none was 14164 * outstanding. 14165 */ 14166 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 14167 bbr->rc_tp->t_acktime = ticks; 14168 } 14169 if (sack_rxmit == 0) 14170 tp->snd_max += xlen; 14171 tot_len += (len + optlen + ipoptlen); 14172 } 14173 nomore: 14174 if (error) { 14175 /* 14176 * Failures do not advance the seq counter above. For the 14177 * case of ENOBUFS we will fall out and become ack-clocked. 14178 * capping the cwnd at the current flight. 14179 * Everything else will just have to retransmit with the timer 14180 * (no pacer). 14181 */ 14182 SOCKBUF_UNLOCK_ASSERT(sb); 14183 BBR_STAT_INC(bbr_saw_oerr); 14184 /* Clear all delay/early tracks */ 14185 bbr->r_ctl.rc_hptsi_agg_delay = 0; 14186 bbr->r_ctl.rc_agg_early = 0; 14187 bbr->r_agg_early_set = 0; 14188 bbr->output_error_seen = 1; 14189 if (bbr->oerror_cnt < 0xf) 14190 bbr->oerror_cnt++; 14191 if (bbr_max_net_error_cnt && (bbr->oerror_cnt >= bbr_max_net_error_cnt)) { 14192 /* drop the session */ 14193 tcp_set_inp_to_drop(inp, ENETDOWN); 14194 } 14195 switch (error) { 14196 case ENOBUFS: 14197 /* 14198 * Make this guy have to get ack's to send 14199 * more but lets make sure we don't 14200 * slam him below a T-O (1MSS). 14201 */ 14202 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 14203 tp->snd_cwnd = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 14204 bbr->r_ctl.rc_lost_bytes)) - maxseg; 14205 if (tp->snd_cwnd < maxseg) 14206 tp->snd_cwnd = maxseg; 14207 } 14208 slot = (bbr_error_base_paceout + 1) << bbr->oerror_cnt; 14209 BBR_STAT_INC(bbr_saw_enobuf); 14210 if (bbr->bbr_hdrw_pacing) 14211 counter_u64_add(bbr_hdwr_pacing_enobuf, 1); 14212 else 14213 counter_u64_add(bbr_nohdwr_pacing_enobuf, 1); 14214 /* 14215 * Here even in the enobuf's case we want to do our 14216 * state update. The reason being we may have been 14217 * called by the input function. If so we have had 14218 * things change. 14219 */ 14220 error = 0; 14221 goto enobufs; 14222 case EMSGSIZE: 14223 /* 14224 * For some reason the interface we used initially 14225 * to send segments changed to another or lowered 14226 * its MTU. If TSO was active we either got an 14227 * interface without TSO capabilits or TSO was 14228 * turned off. If we obtained mtu from ip_output() 14229 * then update it and try again. 14230 */ 14231 /* Turn on tracing (or try to) */ 14232 { 14233 int old_maxseg; 14234 14235 old_maxseg = tp->t_maxseg; 14236 BBR_STAT_INC(bbr_saw_emsgsiz); 14237 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, csum_flags, tso, cts); 14238 if (mtu != 0) 14239 tcp_mss_update(tp, -1, mtu, NULL, NULL); 14240 if (old_maxseg <= tp->t_maxseg) { 14241 /* Huh it did not shrink? */ 14242 tp->t_maxseg = old_maxseg - 40; 14243 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, 0, tso, cts); 14244 } 14245 tp->t_flags &= ~TF_FORCEDATA; 14246 /* 14247 * Nuke all other things that can interfere 14248 * with slot 14249 */ 14250 if ((tot_len + len) && (len >= tp->t_maxseg)) { 14251 slot = bbr_get_pacing_delay(bbr, 14252 bbr->r_ctl.rc_bbr_hptsi_gain, 14253 (tot_len + len), cts, 0); 14254 if (slot < bbr_error_base_paceout) 14255 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 14256 } else 14257 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 14258 bbr->rc_output_starts_timer = 1; 14259 bbr_start_hpts_timer(bbr, tp, cts, 10, slot, 14260 tot_len); 14261 return (error); 14262 } 14263 case EPERM: 14264 tp->t_softerror = error; 14265 /* Fall through */ 14266 case EHOSTDOWN: 14267 case EHOSTUNREACH: 14268 case ENETDOWN: 14269 case ENETUNREACH: 14270 if (TCPS_HAVERCVDSYN(tp->t_state)) { 14271 tp->t_softerror = error; 14272 } 14273 /* FALLTHROUGH */ 14274 default: 14275 tp->t_flags &= ~TF_FORCEDATA; 14276 slot = (bbr_error_base_paceout + 3) << bbr->oerror_cnt; 14277 bbr->rc_output_starts_timer = 1; 14278 bbr_start_hpts_timer(bbr, tp, cts, 11, slot, 0); 14279 return (error); 14280 } 14281 #ifdef STATS 14282 } else if (((tp->t_flags & TF_GPUTINPROG) == 0) && 14283 len && 14284 (rsm == NULL) && 14285 (bbr->rc_in_persist == 0)) { 14286 tp->gput_seq = bbr_seq; 14287 tp->gput_ack = bbr_seq + 14288 min(sbavail(&so->so_snd) - sb_offset, sendwin); 14289 tp->gput_ts = cts; 14290 tp->t_flags |= TF_GPUTINPROG; 14291 #endif 14292 } 14293 TCPSTAT_INC(tcps_sndtotal); 14294 if ((bbr->bbr_hdw_pace_ena) && 14295 (bbr->bbr_attempt_hdwr_pace == 0) && 14296 (bbr->rc_past_init_win) && 14297 (bbr->rc_bbr_state != BBR_STATE_STARTUP) && 14298 (get_filter_value(&bbr->r_ctl.rc_delrate)) && 14299 (inp->inp_route.ro_rt && 14300 inp->inp_route.ro_rt->rt_ifp)) { 14301 /* 14302 * We are past the initial window and 14303 * have at least one measurement so we 14304 * could use hardware pacing if its available. 14305 * We have an interface and we have not attempted 14306 * to setup hardware pacing, lets try to now. 14307 */ 14308 uint64_t rate_wanted; 14309 int err = 0; 14310 14311 rate_wanted = bbr_get_hardware_rate(bbr); 14312 bbr->bbr_attempt_hdwr_pace = 1; 14313 bbr->r_ctl.crte = tcp_set_pacing_rate(bbr->rc_tp, 14314 inp->inp_route.ro_rt->rt_ifp, 14315 rate_wanted, 14316 (RS_PACING_GEQ|RS_PACING_SUB_OK), 14317 &err); 14318 if (bbr->r_ctl.crte) { 14319 bbr_type_log_hdwr_pacing(bbr, 14320 bbr->r_ctl.crte->ptbl->rs_ifp, 14321 rate_wanted, 14322 bbr->r_ctl.crte->rate, 14323 __LINE__, cts, err); 14324 BBR_STAT_INC(bbr_hdwr_rl_add_ok); 14325 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 14326 counter_u64_add(bbr_flows_whdwr_pacing, 1); 14327 bbr->bbr_hdrw_pacing = 1; 14328 /* Now what is our gain status? */ 14329 if (bbr->r_ctl.crte->rate < rate_wanted) { 14330 /* We have a problem */ 14331 bbr_setup_less_of_rate(bbr, cts, 14332 bbr->r_ctl.crte->rate, rate_wanted); 14333 } else { 14334 /* We are good */ 14335 bbr->gain_is_limited = 0; 14336 bbr->skip_gain = 0; 14337 } 14338 tcp_bbr_tso_size_check(bbr, cts); 14339 } else { 14340 bbr_type_log_hdwr_pacing(bbr, 14341 inp->inp_route.ro_rt->rt_ifp, 14342 rate_wanted, 14343 0, 14344 __LINE__, cts, err); 14345 BBR_STAT_INC(bbr_hdwr_rl_add_fail); 14346 } 14347 } 14348 if (bbr->bbr_hdrw_pacing) { 14349 /* 14350 * Worry about cases where the route 14351 * changes or something happened that we 14352 * lost our hardware pacing possibly during 14353 * the last ip_output call. 14354 */ 14355 if (inp->inp_snd_tag == NULL) { 14356 /* A change during ip output disabled hw pacing? */ 14357 bbr->bbr_hdrw_pacing = 0; 14358 } else if ((inp->inp_route.ro_rt == NULL) || 14359 (inp->inp_route.ro_rt->rt_ifp != inp->inp_snd_tag->ifp)) { 14360 /* 14361 * We had an interface or route change, 14362 * detach from the current hdwr pacing 14363 * and setup to re-attempt next go 14364 * round. 14365 */ 14366 bbr->bbr_hdrw_pacing = 0; 14367 bbr->bbr_attempt_hdwr_pace = 0; 14368 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 14369 tcp_bbr_tso_size_check(bbr, cts); 14370 } 14371 } 14372 /* 14373 * Data sent (as far as we can tell). If this advertises a larger 14374 * window than any other segment, then remember the size of the 14375 * advertised window. Any pending ACK has now been sent. 14376 */ 14377 if (SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv)) 14378 tp->rcv_adv = tp->rcv_nxt + recwin; 14379 14380 tp->last_ack_sent = tp->rcv_nxt; 14381 if ((error == 0) && 14382 (bbr->r_ctl.rc_pace_max_segs > tp->t_maxseg) && 14383 (doing_tlp == 0) && 14384 (tso == 0) && 14385 (hw_tls == 0) && 14386 (len > 0) && 14387 ((flags & TH_RST) == 0) && 14388 (IN_RECOVERY(tp->t_flags) == 0) && 14389 (bbr->rc_in_persist == 0) && 14390 ((tp->t_flags & TF_FORCEDATA) == 0) && 14391 (tot_len < bbr->r_ctl.rc_pace_max_segs)) { 14392 /* 14393 * For non-tso we need to goto again until we have sent out 14394 * enough data to match what we are hptsi out every hptsi 14395 * interval. 14396 */ 14397 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14398 /* Make sure snd_nxt is drug up */ 14399 tp->snd_nxt = tp->snd_max; 14400 } 14401 if (rsm != NULL) { 14402 rsm = NULL; 14403 goto skip_again; 14404 } 14405 rsm = NULL; 14406 sack_rxmit = 0; 14407 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA); 14408 goto again; 14409 } 14410 skip_again: 14411 if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) { 14412 /* 14413 * Calculate/Re-Calculate the hptsi slot in usecs based on 14414 * what we have sent so far 14415 */ 14416 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 14417 if (bbr->rc_no_pacing) 14418 slot = 0; 14419 } 14420 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA); 14421 enobufs: 14422 if (bbr->rc_use_google == 0) 14423 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 14424 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 14425 bbr->r_ctl.rc_lost_bytes))); 14426 bbr->rc_output_starts_timer = 1; 14427 if (bbr->bbr_use_rack_cheat && 14428 (more_to_rxt || 14429 ((bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts)) != NULL))) { 14430 /* Rack cheats and shotguns out all rxt's 1ms apart */ 14431 if (slot > 1000) 14432 slot = 1000; 14433 } 14434 if (bbr->bbr_hdrw_pacing && (bbr->hw_pacing_set == 0)) { 14435 /* 14436 * We don't change the tso size until some number of sends 14437 * to give the hardware commands time to get down 14438 * to the interface. 14439 */ 14440 bbr->r_ctl.bbr_hdwr_cnt_noset_snt++; 14441 if (bbr->r_ctl.bbr_hdwr_cnt_noset_snt >= bbr_hdwr_pacing_delay_cnt) { 14442 bbr->hw_pacing_set = 1; 14443 tcp_bbr_tso_size_check(bbr, cts); 14444 } 14445 } 14446 bbr_start_hpts_timer(bbr, tp, cts, 12, slot, tot_len); 14447 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14448 /* Make sure snd_nxt is drug up */ 14449 tp->snd_nxt = tp->snd_max; 14450 } 14451 return (error); 14452 14453 } 14454 14455 /* 14456 * See bbr_output_wtime() for return values. 14457 */ 14458 static int 14459 bbr_output(struct tcpcb *tp) 14460 { 14461 int32_t ret; 14462 struct timeval tv; 14463 struct tcp_bbr *bbr; 14464 14465 NET_EPOCH_ASSERT(); 14466 14467 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14468 INP_WLOCK_ASSERT(tp->t_inpcb); 14469 (void)tcp_get_usecs(&tv); 14470 ret = bbr_output_wtime(tp, &tv); 14471 return (ret); 14472 } 14473 14474 static void 14475 bbr_mtu_chg(struct tcpcb *tp) 14476 { 14477 struct tcp_bbr *bbr; 14478 struct bbr_sendmap *rsm, *frsm = NULL; 14479 uint32_t maxseg; 14480 14481 /* 14482 * The MTU has changed. a) Clear the sack filter. b) Mark everything 14483 * over the current size as SACK_PASS so a retransmit will occur. 14484 */ 14485 14486 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14487 maxseg = tp->t_maxseg - bbr->rc_last_options; 14488 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 14489 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 14490 /* Don't mess with ones acked (by sack?) */ 14491 if (rsm->r_flags & BBR_ACKED) 14492 continue; 14493 if ((rsm->r_end - rsm->r_start) > maxseg) { 14494 /* 14495 * We mark sack-passed on all the previous large 14496 * sends we did. This will force them to retransmit. 14497 */ 14498 rsm->r_flags |= BBR_SACK_PASSED; 14499 if (((rsm->r_flags & BBR_MARKED_LOST) == 0) && 14500 bbr_is_lost(bbr, rsm, bbr->r_ctl.rc_rcvtime)) { 14501 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 14502 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 14503 rsm->r_flags |= BBR_MARKED_LOST; 14504 } 14505 if (frsm == NULL) 14506 frsm = rsm; 14507 } 14508 } 14509 if (frsm) { 14510 bbr->r_ctl.rc_resend = frsm; 14511 } 14512 } 14513 14514 /* 14515 * bbr_ctloutput() must drop the inpcb lock before performing copyin on 14516 * socket option arguments. When it re-acquires the lock after the copy, it 14517 * has to revalidate that the connection is still valid for the socket 14518 * option. 14519 */ 14520 static int 14521 bbr_set_sockopt(struct socket *so, struct sockopt *sopt, 14522 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14523 { 14524 int32_t error = 0, optval; 14525 14526 switch (sopt->sopt_name) { 14527 case TCP_RACK_PACE_MAX_SEG: 14528 case TCP_RACK_MIN_TO: 14529 case TCP_RACK_REORD_THRESH: 14530 case TCP_RACK_REORD_FADE: 14531 case TCP_RACK_TLP_THRESH: 14532 case TCP_RACK_PKT_DELAY: 14533 case TCP_BBR_ALGORITHM: 14534 case TCP_BBR_TSLIMITS: 14535 case TCP_BBR_IWINTSO: 14536 case TCP_BBR_RECFORCE: 14537 case TCP_BBR_STARTUP_PG: 14538 case TCP_BBR_DRAIN_PG: 14539 case TCP_BBR_RWND_IS_APP: 14540 case TCP_BBR_PROBE_RTT_INT: 14541 case TCP_BBR_PROBE_RTT_GAIN: 14542 case TCP_BBR_PROBE_RTT_LEN: 14543 case TCP_BBR_STARTUP_LOSS_EXIT: 14544 case TCP_BBR_USEDEL_RATE: 14545 case TCP_BBR_MIN_RTO: 14546 case TCP_BBR_MAX_RTO: 14547 case TCP_BBR_PACE_PER_SEC: 14548 case TCP_DELACK: 14549 case TCP_BBR_PACE_DEL_TAR: 14550 case TCP_BBR_SEND_IWND_IN_TSO: 14551 case TCP_BBR_EXTRA_STATE: 14552 case TCP_BBR_UTTER_MAX_TSO: 14553 case TCP_BBR_MIN_TOPACEOUT: 14554 case TCP_BBR_FLOOR_MIN_TSO: 14555 case TCP_BBR_TSTMP_RAISES: 14556 case TCP_BBR_POLICER_DETECT: 14557 case TCP_BBR_USE_RACK_CHEAT: 14558 case TCP_DATA_AFTER_CLOSE: 14559 case TCP_BBR_HDWR_PACE: 14560 case TCP_BBR_PACE_SEG_MAX: 14561 case TCP_BBR_PACE_SEG_MIN: 14562 case TCP_BBR_PACE_CROSS: 14563 case TCP_BBR_PACE_OH: 14564 #ifdef NETFLIX_PEAKRATE 14565 case TCP_MAXPEAKRATE: 14566 #endif 14567 case TCP_BBR_TMR_PACE_OH: 14568 case TCP_BBR_RACK_RTT_USE: 14569 case TCP_BBR_RETRAN_WTSO: 14570 break; 14571 default: 14572 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14573 break; 14574 } 14575 INP_WUNLOCK(inp); 14576 error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); 14577 if (error) 14578 return (error); 14579 INP_WLOCK(inp); 14580 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 14581 INP_WUNLOCK(inp); 14582 return (ECONNRESET); 14583 } 14584 tp = intotcpcb(inp); 14585 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14586 switch (sopt->sopt_name) { 14587 case TCP_BBR_PACE_PER_SEC: 14588 BBR_OPTS_INC(tcp_bbr_pace_per_sec); 14589 bbr->r_ctl.bbr_hptsi_per_second = optval; 14590 break; 14591 case TCP_BBR_PACE_DEL_TAR: 14592 BBR_OPTS_INC(tcp_bbr_pace_del_tar); 14593 bbr->r_ctl.bbr_hptsi_segments_delay_tar = optval; 14594 break; 14595 case TCP_BBR_PACE_SEG_MAX: 14596 BBR_OPTS_INC(tcp_bbr_pace_seg_max); 14597 bbr->r_ctl.bbr_hptsi_segments_max = optval; 14598 break; 14599 case TCP_BBR_PACE_SEG_MIN: 14600 BBR_OPTS_INC(tcp_bbr_pace_seg_min); 14601 bbr->r_ctl.bbr_hptsi_bytes_min = optval; 14602 break; 14603 case TCP_BBR_PACE_CROSS: 14604 BBR_OPTS_INC(tcp_bbr_pace_cross); 14605 bbr->r_ctl.bbr_cross_over = optval; 14606 break; 14607 case TCP_BBR_ALGORITHM: 14608 BBR_OPTS_INC(tcp_bbr_algorithm); 14609 if (optval && (bbr->rc_use_google == 0)) { 14610 /* Turn on the google mode */ 14611 bbr_google_mode_on(bbr); 14612 if ((optval > 3) && (optval < 500)) { 14613 /* 14614 * Must be at least greater than .3% 14615 * and must be less than 50.0%. 14616 */ 14617 bbr->r_ctl.bbr_google_discount = optval; 14618 } 14619 } else if ((optval == 0) && (bbr->rc_use_google == 1)) { 14620 /* Turn off the google mode */ 14621 bbr_google_mode_off(bbr); 14622 } 14623 break; 14624 case TCP_BBR_TSLIMITS: 14625 BBR_OPTS_INC(tcp_bbr_tslimits); 14626 if (optval == 1) 14627 bbr->rc_use_ts_limit = 1; 14628 else if (optval == 0) 14629 bbr->rc_use_ts_limit = 0; 14630 else 14631 error = EINVAL; 14632 break; 14633 14634 case TCP_BBR_IWINTSO: 14635 BBR_OPTS_INC(tcp_bbr_iwintso); 14636 if ((optval >= 0) && (optval < 128)) { 14637 uint32_t twin; 14638 14639 bbr->rc_init_win = optval; 14640 twin = bbr_initial_cwnd(bbr, tp); 14641 if ((bbr->rc_past_init_win == 0) && (twin > tp->snd_cwnd)) 14642 tp->snd_cwnd = twin; 14643 else 14644 error = EBUSY; 14645 } else 14646 error = EINVAL; 14647 break; 14648 case TCP_BBR_STARTUP_PG: 14649 BBR_OPTS_INC(tcp_bbr_startup_pg); 14650 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) { 14651 bbr->r_ctl.rc_startup_pg = optval; 14652 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 14653 bbr->r_ctl.rc_bbr_hptsi_gain = optval; 14654 } 14655 } else 14656 error = EINVAL; 14657 break; 14658 case TCP_BBR_DRAIN_PG: 14659 BBR_OPTS_INC(tcp_bbr_drain_pg); 14660 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) 14661 bbr->r_ctl.rc_drain_pg = optval; 14662 else 14663 error = EINVAL; 14664 break; 14665 case TCP_BBR_PROBE_RTT_LEN: 14666 BBR_OPTS_INC(tcp_bbr_probertt_len); 14667 if (optval <= 1) 14668 reset_time_small(&bbr->r_ctl.rc_rttprop, (optval * USECS_IN_SECOND)); 14669 else 14670 error = EINVAL; 14671 break; 14672 case TCP_BBR_PROBE_RTT_GAIN: 14673 BBR_OPTS_INC(tcp_bbr_probertt_gain); 14674 if (optval <= BBR_UNIT) 14675 bbr->r_ctl.bbr_rttprobe_gain_val = optval; 14676 else 14677 error = EINVAL; 14678 break; 14679 case TCP_BBR_PROBE_RTT_INT: 14680 BBR_OPTS_INC(tcp_bbr_probe_rtt_int); 14681 if (optval > 1000) 14682 bbr->r_ctl.rc_probertt_int = optval; 14683 else 14684 error = EINVAL; 14685 break; 14686 case TCP_BBR_MIN_TOPACEOUT: 14687 BBR_OPTS_INC(tcp_bbr_topaceout); 14688 if (optval == 0) { 14689 bbr->no_pacing_until = 0; 14690 bbr->rc_no_pacing = 0; 14691 } else if (optval <= 0x00ff) { 14692 bbr->no_pacing_until = optval; 14693 if ((bbr->r_ctl.rc_pkt_epoch < bbr->no_pacing_until) && 14694 (bbr->rc_bbr_state == BBR_STATE_STARTUP)){ 14695 /* Turn on no pacing */ 14696 bbr->rc_no_pacing = 1; 14697 } 14698 } else 14699 error = EINVAL; 14700 break; 14701 case TCP_BBR_STARTUP_LOSS_EXIT: 14702 BBR_OPTS_INC(tcp_bbr_startup_loss_exit); 14703 bbr->rc_loss_exit = optval; 14704 break; 14705 case TCP_BBR_USEDEL_RATE: 14706 error = EINVAL; 14707 break; 14708 case TCP_BBR_MIN_RTO: 14709 BBR_OPTS_INC(tcp_bbr_min_rto); 14710 bbr->r_ctl.rc_min_rto_ms = optval; 14711 break; 14712 case TCP_BBR_MAX_RTO: 14713 BBR_OPTS_INC(tcp_bbr_max_rto); 14714 bbr->rc_max_rto_sec = optval; 14715 break; 14716 case TCP_RACK_MIN_TO: 14717 /* Minimum time between rack t-o's in ms */ 14718 BBR_OPTS_INC(tcp_rack_min_to); 14719 bbr->r_ctl.rc_min_to = optval; 14720 break; 14721 case TCP_RACK_REORD_THRESH: 14722 /* RACK reorder threshold (shift amount) */ 14723 BBR_OPTS_INC(tcp_rack_reord_thresh); 14724 if ((optval > 0) && (optval < 31)) 14725 bbr->r_ctl.rc_reorder_shift = optval; 14726 else 14727 error = EINVAL; 14728 break; 14729 case TCP_RACK_REORD_FADE: 14730 /* Does reordering fade after ms time */ 14731 BBR_OPTS_INC(tcp_rack_reord_fade); 14732 bbr->r_ctl.rc_reorder_fade = optval; 14733 break; 14734 case TCP_RACK_TLP_THRESH: 14735 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 14736 BBR_OPTS_INC(tcp_rack_tlp_thresh); 14737 if (optval) 14738 bbr->rc_tlp_threshold = optval; 14739 else 14740 error = EINVAL; 14741 break; 14742 case TCP_BBR_USE_RACK_CHEAT: 14743 BBR_OPTS_INC(tcp_use_rackcheat); 14744 if (bbr->rc_use_google) { 14745 error = EINVAL; 14746 break; 14747 } 14748 BBR_OPTS_INC(tcp_rack_cheat); 14749 if (optval) 14750 bbr->bbr_use_rack_cheat = 1; 14751 else 14752 bbr->bbr_use_rack_cheat = 0; 14753 break; 14754 case TCP_BBR_FLOOR_MIN_TSO: 14755 BBR_OPTS_INC(tcp_utter_max_tso); 14756 if ((optval >= 0) && (optval < 40)) 14757 bbr->r_ctl.bbr_hptsi_segments_floor = optval; 14758 else 14759 error = EINVAL; 14760 break; 14761 case TCP_BBR_UTTER_MAX_TSO: 14762 BBR_OPTS_INC(tcp_utter_max_tso); 14763 if ((optval >= 0) && (optval < 0xffff)) 14764 bbr->r_ctl.bbr_utter_max = optval; 14765 else 14766 error = EINVAL; 14767 break; 14768 14769 case TCP_BBR_EXTRA_STATE: 14770 BBR_OPTS_INC(tcp_extra_state); 14771 if (optval) 14772 bbr->rc_use_idle_restart = 1; 14773 else 14774 bbr->rc_use_idle_restart = 0; 14775 break; 14776 case TCP_BBR_SEND_IWND_IN_TSO: 14777 BBR_OPTS_INC(tcp_iwnd_tso); 14778 if (optval) { 14779 bbr->bbr_init_win_cheat = 1; 14780 if (bbr->rc_past_init_win == 0) { 14781 uint32_t cts; 14782 cts = tcp_get_usecs(&bbr->rc_tv); 14783 tcp_bbr_tso_size_check(bbr, cts); 14784 } 14785 } else 14786 bbr->bbr_init_win_cheat = 0; 14787 break; 14788 case TCP_BBR_HDWR_PACE: 14789 BBR_OPTS_INC(tcp_hdwr_pacing); 14790 if (optval){ 14791 bbr->bbr_hdw_pace_ena = 1; 14792 bbr->bbr_attempt_hdwr_pace = 0; 14793 } else { 14794 bbr->bbr_hdw_pace_ena = 0; 14795 #ifdef RATELIMIT 14796 if (bbr->bbr_hdrw_pacing) { 14797 bbr->bbr_hdrw_pacing = 0; 14798 in_pcbdetach_txrtlmt(bbr->rc_inp); 14799 } 14800 #endif 14801 } 14802 break; 14803 14804 case TCP_DELACK: 14805 BBR_OPTS_INC(tcp_delack); 14806 if (optval < 100) { 14807 if (optval == 0) /* off */ 14808 tp->t_delayed_ack = 0; 14809 else if (optval == 1) /* on which is 2 */ 14810 tp->t_delayed_ack = 2; 14811 else /* higher than 2 and less than 100 */ 14812 tp->t_delayed_ack = optval; 14813 if (tp->t_flags & TF_DELACK) { 14814 tp->t_flags &= ~TF_DELACK; 14815 tp->t_flags |= TF_ACKNOW; 14816 bbr_output(tp); 14817 } 14818 } else 14819 error = EINVAL; 14820 break; 14821 case TCP_RACK_PKT_DELAY: 14822 /* RACK added ms i.e. rack-rtt + reord + N */ 14823 BBR_OPTS_INC(tcp_rack_pkt_delay); 14824 bbr->r_ctl.rc_pkt_delay = optval; 14825 break; 14826 #ifdef NETFLIX_PEAKRATE 14827 case TCP_MAXPEAKRATE: 14828 BBR_OPTS_INC(tcp_maxpeak); 14829 error = tcp_set_maxpeakrate(tp, optval); 14830 if (!error) 14831 tp->t_peakrate_thr = tp->t_maxpeakrate; 14832 break; 14833 #endif 14834 case TCP_BBR_RETRAN_WTSO: 14835 BBR_OPTS_INC(tcp_retran_wtso); 14836 if (optval) 14837 bbr->rc_resends_use_tso = 1; 14838 else 14839 bbr->rc_resends_use_tso = 0; 14840 break; 14841 case TCP_DATA_AFTER_CLOSE: 14842 BBR_OPTS_INC(tcp_data_ac); 14843 if (optval) 14844 bbr->rc_allow_data_af_clo = 1; 14845 else 14846 bbr->rc_allow_data_af_clo = 0; 14847 break; 14848 case TCP_BBR_POLICER_DETECT: 14849 BBR_OPTS_INC(tcp_policer_det); 14850 if (bbr->rc_use_google == 0) 14851 error = EINVAL; 14852 else if (optval) 14853 bbr->r_use_policer = 1; 14854 else 14855 bbr->r_use_policer = 0; 14856 break; 14857 14858 case TCP_BBR_TSTMP_RAISES: 14859 BBR_OPTS_INC(tcp_ts_raises); 14860 if (optval) 14861 bbr->ts_can_raise = 1; 14862 else 14863 bbr->ts_can_raise = 0; 14864 break; 14865 case TCP_BBR_TMR_PACE_OH: 14866 BBR_OPTS_INC(tcp_pacing_oh_tmr); 14867 if (bbr->rc_use_google) { 14868 error = EINVAL; 14869 } else { 14870 if (optval) 14871 bbr->r_ctl.rc_incr_tmrs = 1; 14872 else 14873 bbr->r_ctl.rc_incr_tmrs = 0; 14874 } 14875 break; 14876 case TCP_BBR_PACE_OH: 14877 BBR_OPTS_INC(tcp_pacing_oh); 14878 if (bbr->rc_use_google) { 14879 error = EINVAL; 14880 } else { 14881 if (optval > (BBR_INCL_TCP_OH| 14882 BBR_INCL_IP_OH| 14883 BBR_INCL_ENET_OH)) { 14884 error = EINVAL; 14885 break; 14886 } 14887 if (optval & BBR_INCL_TCP_OH) 14888 bbr->r_ctl.rc_inc_tcp_oh = 1; 14889 else 14890 bbr->r_ctl.rc_inc_tcp_oh = 0; 14891 if (optval & BBR_INCL_IP_OH) 14892 bbr->r_ctl.rc_inc_ip_oh = 1; 14893 else 14894 bbr->r_ctl.rc_inc_ip_oh = 0; 14895 if (optval & BBR_INCL_ENET_OH) 14896 bbr->r_ctl.rc_inc_enet_oh = 1; 14897 else 14898 bbr->r_ctl.rc_inc_enet_oh = 0; 14899 } 14900 break; 14901 default: 14902 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14903 break; 14904 } 14905 #ifdef NETFLIX_STATS 14906 tcp_log_socket_option(tp, sopt->sopt_name, optval, error); 14907 #endif 14908 INP_WUNLOCK(inp); 14909 return (error); 14910 } 14911 14912 /* 14913 * return 0 on success, error-num on failure 14914 */ 14915 static int 14916 bbr_get_sockopt(struct socket *so, struct sockopt *sopt, 14917 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14918 { 14919 int32_t error, optval; 14920 14921 /* 14922 * Because all our options are either boolean or an int, we can just 14923 * pull everything into optval and then unlock and copy. If we ever 14924 * add a option that is not a int, then this will have quite an 14925 * impact to this routine. 14926 */ 14927 switch (sopt->sopt_name) { 14928 case TCP_BBR_PACE_PER_SEC: 14929 optval = bbr->r_ctl.bbr_hptsi_per_second; 14930 break; 14931 case TCP_BBR_PACE_DEL_TAR: 14932 optval = bbr->r_ctl.bbr_hptsi_segments_delay_tar; 14933 break; 14934 case TCP_BBR_PACE_SEG_MAX: 14935 optval = bbr->r_ctl.bbr_hptsi_segments_max; 14936 break; 14937 case TCP_BBR_MIN_TOPACEOUT: 14938 optval = bbr->no_pacing_until; 14939 break; 14940 case TCP_BBR_PACE_SEG_MIN: 14941 optval = bbr->r_ctl.bbr_hptsi_bytes_min; 14942 break; 14943 case TCP_BBR_PACE_CROSS: 14944 optval = bbr->r_ctl.bbr_cross_over; 14945 break; 14946 case TCP_BBR_ALGORITHM: 14947 optval = bbr->rc_use_google; 14948 break; 14949 case TCP_BBR_TSLIMITS: 14950 optval = bbr->rc_use_ts_limit; 14951 break; 14952 case TCP_BBR_IWINTSO: 14953 optval = bbr->rc_init_win; 14954 break; 14955 case TCP_BBR_STARTUP_PG: 14956 optval = bbr->r_ctl.rc_startup_pg; 14957 break; 14958 case TCP_BBR_DRAIN_PG: 14959 optval = bbr->r_ctl.rc_drain_pg; 14960 break; 14961 case TCP_BBR_PROBE_RTT_INT: 14962 optval = bbr->r_ctl.rc_probertt_int; 14963 break; 14964 case TCP_BBR_PROBE_RTT_LEN: 14965 optval = (bbr->r_ctl.rc_rttprop.cur_time_limit / USECS_IN_SECOND); 14966 break; 14967 case TCP_BBR_PROBE_RTT_GAIN: 14968 optval = bbr->r_ctl.bbr_rttprobe_gain_val; 14969 break; 14970 case TCP_BBR_STARTUP_LOSS_EXIT: 14971 optval = bbr->rc_loss_exit; 14972 break; 14973 case TCP_BBR_USEDEL_RATE: 14974 error = EINVAL; 14975 break; 14976 case TCP_BBR_MIN_RTO: 14977 optval = bbr->r_ctl.rc_min_rto_ms; 14978 break; 14979 case TCP_BBR_MAX_RTO: 14980 optval = bbr->rc_max_rto_sec; 14981 break; 14982 case TCP_RACK_PACE_MAX_SEG: 14983 /* Max segments in a pace */ 14984 optval = bbr->r_ctl.rc_pace_max_segs; 14985 break; 14986 case TCP_RACK_MIN_TO: 14987 /* Minimum time between rack t-o's in ms */ 14988 optval = bbr->r_ctl.rc_min_to; 14989 break; 14990 case TCP_RACK_REORD_THRESH: 14991 /* RACK reorder threshold (shift amount) */ 14992 optval = bbr->r_ctl.rc_reorder_shift; 14993 break; 14994 case TCP_RACK_REORD_FADE: 14995 /* Does reordering fade after ms time */ 14996 optval = bbr->r_ctl.rc_reorder_fade; 14997 break; 14998 case TCP_BBR_USE_RACK_CHEAT: 14999 /* Do we use the rack cheat for rxt */ 15000 optval = bbr->bbr_use_rack_cheat; 15001 break; 15002 case TCP_BBR_FLOOR_MIN_TSO: 15003 optval = bbr->r_ctl.bbr_hptsi_segments_floor; 15004 break; 15005 case TCP_BBR_UTTER_MAX_TSO: 15006 optval = bbr->r_ctl.bbr_utter_max; 15007 break; 15008 case TCP_BBR_SEND_IWND_IN_TSO: 15009 /* Do we send TSO size segments initially */ 15010 optval = bbr->bbr_init_win_cheat; 15011 break; 15012 case TCP_BBR_EXTRA_STATE: 15013 optval = bbr->rc_use_idle_restart; 15014 break; 15015 case TCP_RACK_TLP_THRESH: 15016 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 15017 optval = bbr->rc_tlp_threshold; 15018 break; 15019 case TCP_RACK_PKT_DELAY: 15020 /* RACK added ms i.e. rack-rtt + reord + N */ 15021 optval = bbr->r_ctl.rc_pkt_delay; 15022 break; 15023 case TCP_BBR_RETRAN_WTSO: 15024 optval = bbr->rc_resends_use_tso; 15025 break; 15026 case TCP_DATA_AFTER_CLOSE: 15027 optval = bbr->rc_allow_data_af_clo; 15028 break; 15029 case TCP_DELACK: 15030 optval = tp->t_delayed_ack; 15031 break; 15032 case TCP_BBR_HDWR_PACE: 15033 optval = bbr->bbr_hdw_pace_ena; 15034 break; 15035 case TCP_BBR_POLICER_DETECT: 15036 optval = bbr->r_use_policer; 15037 break; 15038 case TCP_BBR_TSTMP_RAISES: 15039 optval = bbr->ts_can_raise; 15040 break; 15041 case TCP_BBR_TMR_PACE_OH: 15042 optval = bbr->r_ctl.rc_incr_tmrs; 15043 break; 15044 case TCP_BBR_PACE_OH: 15045 optval = 0; 15046 if (bbr->r_ctl.rc_inc_tcp_oh) 15047 optval |= BBR_INCL_TCP_OH; 15048 if (bbr->r_ctl.rc_inc_ip_oh) 15049 optval |= BBR_INCL_IP_OH; 15050 if (bbr->r_ctl.rc_inc_enet_oh) 15051 optval |= BBR_INCL_ENET_OH; 15052 break; 15053 default: 15054 return (tcp_default_ctloutput(so, sopt, inp, tp)); 15055 break; 15056 } 15057 INP_WUNLOCK(inp); 15058 error = sooptcopyout(sopt, &optval, sizeof optval); 15059 return (error); 15060 } 15061 15062 /* 15063 * return 0 on success, error-num on failure 15064 */ 15065 static int 15066 bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 15067 { 15068 int32_t error = EINVAL; 15069 struct tcp_bbr *bbr; 15070 15071 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 15072 if (bbr == NULL) { 15073 /* Huh? */ 15074 goto out; 15075 } 15076 if (sopt->sopt_dir == SOPT_SET) { 15077 return (bbr_set_sockopt(so, sopt, inp, tp, bbr)); 15078 } else if (sopt->sopt_dir == SOPT_GET) { 15079 return (bbr_get_sockopt(so, sopt, inp, tp, bbr)); 15080 } 15081 out: 15082 INP_WUNLOCK(inp); 15083 return (error); 15084 } 15085 15086 15087 struct tcp_function_block __tcp_bbr = { 15088 .tfb_tcp_block_name = __XSTRING(STACKNAME), 15089 .tfb_tcp_output = bbr_output, 15090 .tfb_do_queued_segments = ctf_do_queued_segments, 15091 .tfb_do_segment_nounlock = bbr_do_segment_nounlock, 15092 .tfb_tcp_do_segment = bbr_do_segment, 15093 .tfb_tcp_ctloutput = bbr_ctloutput, 15094 .tfb_tcp_fb_init = bbr_init, 15095 .tfb_tcp_fb_fini = bbr_fini, 15096 .tfb_tcp_timer_stop_all = bbr_stopall, 15097 .tfb_tcp_timer_activate = bbr_timer_activate, 15098 .tfb_tcp_timer_active = bbr_timer_active, 15099 .tfb_tcp_timer_stop = bbr_timer_stop, 15100 .tfb_tcp_rexmit_tmr = bbr_remxt_tmr, 15101 .tfb_tcp_handoff_ok = bbr_handoff_ok, 15102 .tfb_tcp_mtu_chg = bbr_mtu_chg 15103 }; 15104 15105 static const char *bbr_stack_names[] = { 15106 __XSTRING(STACKNAME), 15107 #ifdef STACKALIAS 15108 __XSTRING(STACKALIAS), 15109 #endif 15110 }; 15111 15112 static bool bbr_mod_inited = false; 15113 15114 static int 15115 tcp_addbbr(module_t mod, int32_t type, void *data) 15116 { 15117 int32_t err = 0; 15118 int num_stacks; 15119 15120 switch (type) { 15121 case MOD_LOAD: 15122 printf("Attempting to load " __XSTRING(MODNAME) "\n"); 15123 bbr_zone = uma_zcreate(__XSTRING(MODNAME) "_map", 15124 sizeof(struct bbr_sendmap), 15125 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 15126 bbr_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb", 15127 sizeof(struct tcp_bbr), 15128 NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 15129 sysctl_ctx_init(&bbr_sysctl_ctx); 15130 bbr_sysctl_root = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 15131 SYSCTL_STATIC_CHILDREN(_net_inet_tcp), 15132 OID_AUTO, 15133 #ifdef STACKALIAS 15134 __XSTRING(STACKALIAS), 15135 #else 15136 __XSTRING(STACKNAME), 15137 #endif 15138 CTLFLAG_RW, 0, 15139 ""); 15140 if (bbr_sysctl_root == NULL) { 15141 printf("Failed to add sysctl node\n"); 15142 err = EFAULT; 15143 goto free_uma; 15144 } 15145 bbr_init_sysctls(); 15146 num_stacks = nitems(bbr_stack_names); 15147 err = register_tcp_functions_as_names(&__tcp_bbr, M_WAITOK, 15148 bbr_stack_names, &num_stacks); 15149 if (err) { 15150 printf("Failed to register %s stack name for " 15151 "%s module\n", bbr_stack_names[num_stacks], 15152 __XSTRING(MODNAME)); 15153 sysctl_ctx_free(&bbr_sysctl_ctx); 15154 free_uma: 15155 uma_zdestroy(bbr_zone); 15156 uma_zdestroy(bbr_pcb_zone); 15157 bbr_counter_destroy(); 15158 printf("Failed to register " __XSTRING(MODNAME) 15159 " module err:%d\n", err); 15160 return (err); 15161 } 15162 tcp_lro_reg_mbufq(); 15163 bbr_mod_inited = true; 15164 printf(__XSTRING(MODNAME) " is now available\n"); 15165 break; 15166 case MOD_QUIESCE: 15167 err = deregister_tcp_functions(&__tcp_bbr, true, false); 15168 break; 15169 case MOD_UNLOAD: 15170 err = deregister_tcp_functions(&__tcp_bbr, false, true); 15171 if (err == EBUSY) 15172 break; 15173 if (bbr_mod_inited) { 15174 uma_zdestroy(bbr_zone); 15175 uma_zdestroy(bbr_pcb_zone); 15176 sysctl_ctx_free(&bbr_sysctl_ctx); 15177 bbr_counter_destroy(); 15178 printf(__XSTRING(MODNAME) 15179 " is now no longer available\n"); 15180 bbr_mod_inited = false; 15181 } 15182 tcp_lro_dereg_mbufq(); 15183 err = 0; 15184 break; 15185 default: 15186 return (EOPNOTSUPP); 15187 } 15188 return (err); 15189 } 15190 15191 static moduledata_t tcp_bbr = { 15192 .name = __XSTRING(MODNAME), 15193 .evhand = tcp_addbbr, 15194 .priv = 0 15195 }; 15196 15197 MODULE_VERSION(MODNAME, 1); 15198 DECLARE_MODULE(MODNAME, tcp_bbr, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 15199 MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1); 15200