1 /*- 2 * Copyright (c) 2016-2020 Netflix, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 */ 26 /** 27 * Author: Randall Stewart <rrs@netflix.com> 28 * This work is based on the ACM Queue paper 29 * BBR - Congestion Based Congestion Control 30 * and also numerous discussions with Neal, Yuchung and Van. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_inet.h" 37 #include "opt_inet6.h" 38 #include "opt_ipsec.h" 39 #include "opt_tcpdebug.h" 40 #include "opt_ratelimit.h" 41 #include <sys/param.h> 42 #include <sys/arb.h> 43 #include <sys/module.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #ifdef TCP_HHOOK 47 #include <sys/hhook.h> 48 #endif 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/sysctl.h> 55 #include <sys/systm.h> 56 #ifdef STATS 57 #include <sys/qmath.h> 58 #include <sys/tree.h> 59 #include <sys/stats.h> /* Must come after qmath.h and tree.h */ 60 #endif 61 #include <sys/refcount.h> 62 #include <sys/queue.h> 63 #include <sys/eventhandler.h> 64 #include <sys/smp.h> 65 #include <sys/kthread.h> 66 #include <sys/lock.h> 67 #include <sys/mutex.h> 68 #include <sys/tim_filter.h> 69 #include <sys/time.h> 70 #include <sys/protosw.h> 71 #include <vm/uma.h> 72 #include <sys/kern_prefetch.h> 73 74 #include <net/route.h> 75 #include <net/route/nhop.h> 76 #include <net/vnet.h> 77 78 #define TCPSTATES /* for logging */ 79 80 #include <netinet/in.h> 81 #include <netinet/in_kdtrace.h> 82 #include <netinet/in_pcb.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_icmp.h> /* required for icmp_var.h */ 85 #include <netinet/icmp_var.h> /* for ICMP_BANDLIM */ 86 #include <netinet/ip_var.h> 87 #include <netinet/ip6.h> 88 #include <netinet6/in6_pcb.h> 89 #include <netinet6/ip6_var.h> 90 #define TCPOUTFLAGS 91 #include <netinet/tcp.h> 92 #include <netinet/tcp_fsm.h> 93 #include <netinet/tcp_seq.h> 94 #include <netinet/tcp_timer.h> 95 #include <netinet/tcp_var.h> 96 #include <netinet/tcpip.h> 97 #include <netinet/tcp_hpts.h> 98 #include <netinet/cc/cc.h> 99 #include <netinet/tcp_log_buf.h> 100 #include <netinet/tcp_ratelimit.h> 101 #include <netinet/tcp_lro.h> 102 #ifdef TCPDEBUG 103 #include <netinet/tcp_debug.h> 104 #endif /* TCPDEBUG */ 105 #ifdef TCP_OFFLOAD 106 #include <netinet/tcp_offload.h> 107 #endif 108 #ifdef INET6 109 #include <netinet6/tcp6_var.h> 110 #endif 111 #include <netinet/tcp_fastopen.h> 112 113 #include <netipsec/ipsec_support.h> 114 #include <net/if.h> 115 #include <net/if_var.h> 116 #include <net/ethernet.h> 117 118 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 119 #include <netipsec/ipsec.h> 120 #include <netipsec/ipsec6.h> 121 #endif /* IPSEC */ 122 123 #include <netinet/udp.h> 124 #include <netinet/udp_var.h> 125 #include <machine/in_cksum.h> 126 127 #ifdef MAC 128 #include <security/mac/mac_framework.h> 129 #endif 130 131 #include "sack_filter.h" 132 #include "tcp_bbr.h" 133 #include "rack_bbr_common.h" 134 uma_zone_t bbr_zone; 135 uma_zone_t bbr_pcb_zone; 136 137 struct sysctl_ctx_list bbr_sysctl_ctx; 138 struct sysctl_oid *bbr_sysctl_root; 139 140 #define TCPT_RANGESET_NOSLOP(tv, value, tvmin, tvmax) do { \ 141 (tv) = (value); \ 142 if ((u_long)(tv) < (u_long)(tvmin)) \ 143 (tv) = (tvmin); \ 144 if ((u_long)(tv) > (u_long)(tvmax)) \ 145 (tv) = (tvmax); \ 146 } while(0) 147 148 /*#define BBR_INVARIANT 1*/ 149 150 /* 151 * initial window 152 */ 153 static uint32_t bbr_def_init_win = 10; 154 static int32_t bbr_persist_min = 250000; /* 250ms */ 155 static int32_t bbr_persist_max = 1000000; /* 1 Second */ 156 static int32_t bbr_cwnd_may_shrink = 0; 157 static int32_t bbr_cwndtarget_rtt_touse = BBR_RTT_PROP; 158 static int32_t bbr_num_pktepo_for_del_limit = BBR_NUM_RTTS_FOR_DEL_LIMIT; 159 static int32_t bbr_hardware_pacing_limit = 8000; 160 static int32_t bbr_quanta = 3; /* How much extra quanta do we get? */ 161 static int32_t bbr_no_retran = 0; 162 163 static int32_t bbr_error_base_paceout = 10000; /* usec to pace */ 164 static int32_t bbr_max_net_error_cnt = 10; 165 /* Should the following be dynamic too -- loss wise */ 166 static int32_t bbr_rtt_gain_thresh = 0; 167 /* Measurement controls */ 168 static int32_t bbr_use_google_algo = 1; 169 static int32_t bbr_ts_limiting = 1; 170 static int32_t bbr_ts_can_raise = 0; 171 static int32_t bbr_do_red = 600; 172 static int32_t bbr_red_scale = 20000; 173 static int32_t bbr_red_mul = 1; 174 static int32_t bbr_red_div = 2; 175 static int32_t bbr_red_growth_restrict = 1; 176 static int32_t bbr_target_is_bbunit = 0; 177 static int32_t bbr_drop_limit = 0; 178 /* 179 * How much gain do we need to see to 180 * stay in startup? 181 */ 182 static int32_t bbr_marks_rxt_sack_passed = 0; 183 static int32_t bbr_start_exit = 25; 184 static int32_t bbr_low_start_exit = 25; /* When we are in reduced gain */ 185 static int32_t bbr_startup_loss_thresh = 2000; /* 20.00% loss */ 186 static int32_t bbr_hptsi_max_mul = 1; /* These two mul/div assure a min pacing */ 187 static int32_t bbr_hptsi_max_div = 2; /* time, 0 means turned off. We need this 188 * if we go back ever to where the pacer 189 * has priority over timers. 190 */ 191 static int32_t bbr_policer_call_from_rack_to = 0; 192 static int32_t bbr_policer_detection_enabled = 1; 193 static int32_t bbr_min_measurements_req = 1; /* We need at least 2 194 * measurments before we are 195 * "good" note that 2 == 1. 196 * This is because we use a > 197 * comparison. This means if 198 * min_measure was 0, it takes 199 * num-measures > min(0) and 200 * you get 1 measurement and 201 * you are good. Set to 1, you 202 * have to have two 203 * measurements (this is done 204 * to prevent it from being ok 205 * to have no measurements). */ 206 static int32_t bbr_no_pacing_until = 4; 207 208 static int32_t bbr_min_usec_delta = 20000; /* 20,000 usecs */ 209 static int32_t bbr_min_peer_delta = 20; /* 20 units */ 210 static int32_t bbr_delta_percent = 150; /* 15.0 % */ 211 212 static int32_t bbr_target_cwnd_mult_limit = 8; 213 /* 214 * bbr_cwnd_min_val is the number of 215 * segments we hold to in the RTT probe 216 * state typically 4. 217 */ 218 static int32_t bbr_cwnd_min_val = BBR_PROBERTT_NUM_MSS; 219 220 static int32_t bbr_cwnd_min_val_hs = BBR_HIGHSPEED_NUM_MSS; 221 222 static int32_t bbr_gain_to_target = 1; 223 static int32_t bbr_gain_gets_extra_too = 1; 224 /* 225 * bbr_high_gain is the 2/ln(2) value we need 226 * to double the sending rate in startup. This 227 * is used for both cwnd and hptsi gain's. 228 */ 229 static int32_t bbr_high_gain = BBR_UNIT * 2885 / 1000 + 1; 230 static int32_t bbr_startup_lower = BBR_UNIT * 1500 / 1000 + 1; 231 static int32_t bbr_use_lower_gain_in_startup = 1; 232 233 /* thresholds for reduction on drain in sub-states/drain */ 234 static int32_t bbr_drain_rtt = BBR_SRTT; 235 static int32_t bbr_drain_floor = 88; 236 static int32_t google_allow_early_out = 1; 237 static int32_t google_consider_lost = 1; 238 static int32_t bbr_drain_drop_mul = 4; 239 static int32_t bbr_drain_drop_div = 5; 240 static int32_t bbr_rand_ot = 50; 241 static int32_t bbr_can_force_probertt = 0; 242 static int32_t bbr_can_adjust_probertt = 1; 243 static int32_t bbr_probertt_sets_rtt = 0; 244 static int32_t bbr_can_use_ts_for_rtt = 1; 245 static int32_t bbr_is_ratio = 0; 246 static int32_t bbr_sub_drain_app_limit = 1; 247 static int32_t bbr_prtt_slam_cwnd = 1; 248 static int32_t bbr_sub_drain_slam_cwnd = 1; 249 static int32_t bbr_slam_cwnd_in_main_drain = 1; 250 static int32_t bbr_filter_len_sec = 6; /* How long does the rttProp filter 251 * hold */ 252 static uint32_t bbr_rtt_probe_limit = (USECS_IN_SECOND * 4); 253 /* 254 * bbr_drain_gain is the reverse of the high_gain 255 * designed to drain back out the standing queue 256 * that is formed in startup by causing a larger 257 * hptsi gain and thus drainging the packets 258 * in flight. 259 */ 260 static int32_t bbr_drain_gain = BBR_UNIT * 1000 / 2885; 261 static int32_t bbr_rttprobe_gain = 192; 262 263 /* 264 * The cwnd_gain is the default cwnd gain applied when 265 * calculating a target cwnd. Note that the cwnd is 266 * a secondary factor in the way BBR works (see the 267 * paper and think about it, it will take some time). 268 * Basically the hptsi_gain spreads the packets out 269 * so you never get more than BDP to the peer even 270 * if the cwnd is high. In our implemenation that 271 * means in non-recovery/retransmission scenarios 272 * cwnd will never be reached by the flight-size. 273 */ 274 static int32_t bbr_cwnd_gain = BBR_UNIT * 2; 275 static int32_t bbr_tlp_type_to_use = BBR_SRTT; 276 static int32_t bbr_delack_time = 100000; /* 100ms in useconds */ 277 static int32_t bbr_sack_not_required = 0; /* set to one to allow non-sack to use bbr */ 278 static int32_t bbr_initial_bw_bps = 62500; /* 500kbps in bytes ps */ 279 static int32_t bbr_ignore_data_after_close = 1; 280 static int16_t bbr_hptsi_gain[] = { 281 (BBR_UNIT *5 / 4), 282 (BBR_UNIT * 3 / 4), 283 BBR_UNIT, 284 BBR_UNIT, 285 BBR_UNIT, 286 BBR_UNIT, 287 BBR_UNIT, 288 BBR_UNIT 289 }; 290 int32_t bbr_use_rack_resend_cheat = 1; 291 int32_t bbr_sends_full_iwnd = 1; 292 293 #define BBR_HPTSI_GAIN_MAX 8 294 /* 295 * The BBR module incorporates a number of 296 * TCP ideas that have been put out into the IETF 297 * over the last few years: 298 * - Yuchung Cheng's RACK TCP (for which its named) that 299 * will stop us using the number of dup acks and instead 300 * use time as the gage of when we retransmit. 301 * - Reorder Detection of RFC4737 and the Tail-Loss probe draft 302 * of Dukkipati et.al. 303 * - Van Jacobson's et.al BBR. 304 * 305 * RACK depends on SACK, so if an endpoint arrives that 306 * cannot do SACK the state machine below will shuttle the 307 * connection back to using the "default" TCP stack that is 308 * in FreeBSD. 309 * 310 * To implement BBR and RACK the original TCP stack was first decomposed 311 * into a functional state machine with individual states 312 * for each of the possible TCP connection states. The do_segement 313 * functions role in life is to mandate the connection supports SACK 314 * initially and then assure that the RACK state matches the conenction 315 * state before calling the states do_segment function. Data processing 316 * of inbound segments also now happens in the hpts_do_segment in general 317 * with only one exception. This is so we can keep the connection on 318 * a single CPU. 319 * 320 * Each state is simplified due to the fact that the original do_segment 321 * has been decomposed and we *know* what state we are in (no 322 * switches on the state) and all tests for SACK are gone. This 323 * greatly simplifies what each state does. 324 * 325 * TCP output is also over-written with a new version since it 326 * must maintain the new rack scoreboard and has had hptsi 327 * integrated as a requirment. Still todo is to eliminate the 328 * use of the callout_() system and use the hpts for all 329 * timers as well. 330 */ 331 static uint32_t bbr_rtt_probe_time = 200000; /* 200ms in micro seconds */ 332 static uint32_t bbr_rtt_probe_cwndtarg = 4; /* How many mss's outstanding */ 333 static const int32_t bbr_min_req_free = 2; /* The min we must have on the 334 * free list */ 335 static int32_t bbr_tlp_thresh = 1; 336 static int32_t bbr_reorder_thresh = 2; 337 static int32_t bbr_reorder_fade = 60000000; /* 0 - never fade, def 338 * 60,000,000 - 60 seconds */ 339 static int32_t bbr_pkt_delay = 1000; 340 static int32_t bbr_min_to = 1000; /* Number of usec's minimum timeout */ 341 static int32_t bbr_incr_timers = 1; 342 343 static int32_t bbr_tlp_min = 10000; /* 10ms in usecs */ 344 static int32_t bbr_delayed_ack_time = 200000; /* 200ms in usecs */ 345 static int32_t bbr_exit_startup_at_loss = 1; 346 347 /* 348 * bbr_lt_bw_ratio is 1/8th 349 * bbr_lt_bw_diff is < 4 Kbit/sec 350 */ 351 static uint64_t bbr_lt_bw_diff = 4000 / 8; /* In bytes per second */ 352 static uint64_t bbr_lt_bw_ratio = 8; /* For 1/8th */ 353 static uint32_t bbr_lt_bw_max_rtts = 48; /* How many rtt's do we use 354 * the lt_bw for */ 355 static uint32_t bbr_lt_intvl_min_rtts = 4; /* Min num of RTT's to measure 356 * lt_bw */ 357 static int32_t bbr_lt_intvl_fp = 0; /* False positive epoch diff */ 358 static int32_t bbr_lt_loss_thresh = 196; /* Lost vs delivered % */ 359 static int32_t bbr_lt_fd_thresh = 100; /* false detection % */ 360 361 static int32_t bbr_verbose_logging = 0; 362 /* 363 * Currently regular tcp has a rto_min of 30ms 364 * the backoff goes 12 times so that ends up 365 * being a total of 122.850 seconds before a 366 * connection is killed. 367 */ 368 static int32_t bbr_rto_min_ms = 30; /* 30ms same as main freebsd */ 369 static int32_t bbr_rto_max_sec = 4; /* 4 seconds */ 370 371 /****************************************************/ 372 /* DEFAULT TSO SIZING (cpu performance impacting) */ 373 /****************************************************/ 374 /* What amount is our formula using to get TSO size */ 375 static int32_t bbr_hptsi_per_second = 1000; 376 377 /* 378 * For hptsi under bbr_cross_over connections what is delay 379 * target 7ms (in usec) combined with a seg_max of 2 380 * gets us close to identical google behavior in 381 * TSO size selection (possibly more 1MSS sends). 382 */ 383 static int32_t bbr_hptsi_segments_delay_tar = 7000; 384 385 /* Does pacing delay include overhead's in its time calculations? */ 386 static int32_t bbr_include_enet_oh = 0; 387 static int32_t bbr_include_ip_oh = 1; 388 static int32_t bbr_include_tcp_oh = 1; 389 static int32_t bbr_google_discount = 10; 390 391 /* Do we use (nf mode) pkt-epoch to drive us or rttProp? */ 392 static int32_t bbr_state_is_pkt_epoch = 0; 393 static int32_t bbr_state_drain_2_tar = 1; 394 /* What is the max the 0 - bbr_cross_over MBPS TSO target 395 * can reach using our delay target. Note that this 396 * value becomes the floor for the cross over 397 * algorithm. 398 */ 399 static int32_t bbr_hptsi_segments_max = 2; 400 static int32_t bbr_hptsi_segments_floor = 1; 401 static int32_t bbr_hptsi_utter_max = 0; 402 403 /* What is the min the 0 - bbr_cross-over MBPS TSO target can be */ 404 static int32_t bbr_hptsi_bytes_min = 1460; 405 static int32_t bbr_all_get_min = 0; 406 407 /* Cross over point from algo-a to algo-b */ 408 static uint32_t bbr_cross_over = TWENTY_THREE_MBPS; 409 410 /* Do we deal with our restart state? */ 411 static int32_t bbr_uses_idle_restart = 0; 412 static int32_t bbr_idle_restart_threshold = 100000; /* 100ms in useconds */ 413 414 /* Do we allow hardware pacing? */ 415 static int32_t bbr_allow_hdwr_pacing = 0; 416 static int32_t bbr_hdwr_pace_adjust = 2; /* multipler when we calc the tso size */ 417 static int32_t bbr_hdwr_pace_floor = 1; 418 static int32_t bbr_hdwr_pacing_delay_cnt = 10; 419 420 /****************************************************/ 421 static int32_t bbr_resends_use_tso = 0; 422 static int32_t bbr_tlp_max_resend = 2; 423 static int32_t bbr_sack_block_limit = 128; 424 425 #define BBR_MAX_STAT 19 426 counter_u64_t bbr_state_time[BBR_MAX_STAT]; 427 counter_u64_t bbr_state_lost[BBR_MAX_STAT]; 428 counter_u64_t bbr_state_resend[BBR_MAX_STAT]; 429 counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; 430 counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; 431 counter_u64_t bbr_out_size[TCP_MSS_ACCT_SIZE]; 432 counter_u64_t bbr_flows_whdwr_pacing; 433 counter_u64_t bbr_flows_nohdwr_pacing; 434 435 counter_u64_t bbr_nohdwr_pacing_enobuf; 436 counter_u64_t bbr_hdwr_pacing_enobuf; 437 438 static inline uint64_t bbr_get_bw(struct tcp_bbr *bbr); 439 440 /* 441 * Static defintions we need for forward declarations. 442 */ 443 static uint32_t 444 bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, 445 uint32_t useconds_time, uint64_t bw); 446 static uint32_t 447 bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain); 448 static void 449 bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win); 450 static void 451 bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses); 452 static void 453 bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int line, 454 int dolog); 455 static uint32_t 456 bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain); 457 static void 458 bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, 459 int32_t pkt_epoch, uint32_t losses); 460 static uint32_t 461 bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm); 462 static uint32_t bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp); 463 static uint32_t 464 bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, 465 struct bbr_sendmap *rsm, uint32_t srtt, 466 uint32_t cts); 467 static void 468 bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, 469 int32_t line); 470 static void 471 bbr_set_state_target(struct tcp_bbr *bbr, int line); 472 static void 473 bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line); 474 475 static void 476 bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line); 477 478 static void 479 tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts); 480 481 static void 482 bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts); 483 484 static void 485 bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, uint32_t rtt, 486 uint32_t line, uint8_t is_start, uint16_t set); 487 488 static struct bbr_sendmap * 489 bbr_find_lowest_rsm(struct tcp_bbr *bbr); 490 static __inline uint32_t 491 bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type); 492 static void 493 bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which); 494 495 static void 496 bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, 497 uint32_t thresh, uint32_t to); 498 static void 499 bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag); 500 501 static void 502 bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, 503 uint32_t del_by, uint32_t cts, uint32_t sloton, uint32_t prev_delay); 504 505 static void 506 bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, 507 uint32_t cts, int32_t line); 508 static void 509 bbr_stop_all_timers(struct tcpcb *tp); 510 static void 511 bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts); 512 static void 513 bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts); 514 static void 515 bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts); 516 517 static void 518 bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, 519 uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod); 520 521 static int 522 bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, 523 struct tcpcb *tp); 524 525 static inline uint8_t 526 bbr_state_val(struct tcp_bbr *bbr) 527 { 528 return(bbr->rc_bbr_substate); 529 } 530 531 static inline uint32_t 532 get_min_cwnd(struct tcp_bbr *bbr) 533 { 534 int mss; 535 536 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 537 if (bbr_get_rtt(bbr, BBR_RTT_PROP) < BBR_HIGH_SPEED) 538 return (bbr_cwnd_min_val_hs * mss); 539 else 540 return (bbr_cwnd_min_val * mss); 541 } 542 543 static uint32_t 544 bbr_get_persists_timer_val(struct tcpcb *tp, struct tcp_bbr *bbr) 545 { 546 uint64_t srtt, var; 547 uint64_t ret_val; 548 549 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT; 550 if (tp->t_srtt == 0) { 551 srtt = (uint64_t)BBR_INITIAL_RTO; 552 var = 0; 553 } else { 554 srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); 555 var = ((uint64_t)TICKS_2_USEC(tp->t_rttvar) >> TCP_RTT_SHIFT); 556 } 557 TCPT_RANGESET_NOSLOP(ret_val, ((srtt + var) * tcp_backoff[tp->t_rxtshift]), 558 bbr_persist_min, bbr_persist_max); 559 return ((uint32_t)ret_val); 560 } 561 562 static uint32_t 563 bbr_timer_start(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 564 { 565 /* 566 * Start the FR timer, we do this based on getting the first one in 567 * the rc_tmap. Note that if its NULL we must stop the timer. in all 568 * events we need to stop the running timer (if its running) before 569 * starting the new one. 570 */ 571 uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse; 572 int32_t idx; 573 int32_t is_tlp_timer = 0; 574 struct bbr_sendmap *rsm; 575 576 if (bbr->rc_all_timers_stopped) { 577 /* All timers have been stopped none are to run */ 578 return (0); 579 } 580 if (bbr->rc_in_persist) { 581 /* We can't start any timer in persists */ 582 return (bbr_get_persists_timer_val(tp, bbr)); 583 } 584 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 585 if ((rsm == NULL) || 586 ((tp->t_flags & TF_SACK_PERMIT) == 0) || 587 (tp->t_state < TCPS_ESTABLISHED)) { 588 /* Nothing on the send map */ 589 activate_rxt: 590 if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) { 591 uint64_t tov; 592 593 time_since_sent = 0; 594 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 595 if (rsm) { 596 idx = rsm->r_rtr_cnt - 1; 597 if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) 598 tstmp_touse = rsm->r_tim_lastsent[idx]; 599 else 600 tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; 601 if (TSTMP_GT(tstmp_touse, cts)) 602 time_since_sent = cts - tstmp_touse; 603 } 604 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RXT; 605 if (tp->t_srtt == 0) 606 tov = BBR_INITIAL_RTO; 607 else 608 tov = ((uint64_t)(TICKS_2_USEC(tp->t_srtt) + 609 ((uint64_t)TICKS_2_USEC(tp->t_rttvar) * (uint64_t)4)) >> TCP_RTT_SHIFT); 610 if (tp->t_rxtshift) 611 tov *= tcp_backoff[tp->t_rxtshift]; 612 if (tov > time_since_sent) 613 tov -= time_since_sent; 614 else 615 tov = bbr->r_ctl.rc_min_to; 616 TCPT_RANGESET_NOSLOP(to, tov, 617 (bbr->r_ctl.rc_min_rto_ms * MS_IN_USEC), 618 (bbr->rc_max_rto_sec * USECS_IN_SECOND)); 619 bbr_log_timer_var(bbr, 2, cts, 0, srtt, 0, to); 620 return (to); 621 } 622 return (0); 623 } 624 if (rsm->r_flags & BBR_ACKED) { 625 rsm = bbr_find_lowest_rsm(bbr); 626 if (rsm == NULL) { 627 /* No lowest? */ 628 goto activate_rxt; 629 } 630 } 631 /* Convert from ms to usecs */ 632 if (rsm->r_flags & BBR_SACK_PASSED) { 633 if ((tp->t_flags & TF_SENTFIN) && 634 ((tp->snd_max - tp->snd_una) == 1) && 635 (rsm->r_flags & BBR_HAS_FIN)) { 636 /* 637 * We don't start a bbr rack timer if all we have is 638 * a FIN outstanding. 639 */ 640 goto activate_rxt; 641 } 642 srtt = bbr_get_rtt(bbr, BBR_RTT_RACK); 643 thresh = bbr_calc_thresh_rack(bbr, srtt, cts, rsm); 644 idx = rsm->r_rtr_cnt - 1; 645 exp = rsm->r_tim_lastsent[idx] + thresh; 646 if (SEQ_GEQ(exp, cts)) { 647 to = exp - cts; 648 if (to < bbr->r_ctl.rc_min_to) { 649 to = bbr->r_ctl.rc_min_to; 650 } 651 } else { 652 to = bbr->r_ctl.rc_min_to; 653 } 654 } else { 655 /* Ok we need to do a TLP not RACK */ 656 if (bbr->rc_tlp_in_progress != 0) { 657 /* 658 * The previous send was a TLP. 659 */ 660 goto activate_rxt; 661 } 662 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); 663 if (rsm == NULL) { 664 /* We found no rsm to TLP with. */ 665 goto activate_rxt; 666 } 667 if (rsm->r_flags & BBR_HAS_FIN) { 668 /* If its a FIN we don't do TLP */ 669 rsm = NULL; 670 goto activate_rxt; 671 } 672 time_since_sent = 0; 673 idx = rsm->r_rtr_cnt - 1; 674 if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) 675 tstmp_touse = rsm->r_tim_lastsent[idx]; 676 else 677 tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; 678 if (TSTMP_GT(tstmp_touse, cts)) 679 time_since_sent = cts - tstmp_touse; 680 is_tlp_timer = 1; 681 srtt = bbr_get_rtt(bbr, bbr_tlp_type_to_use); 682 thresh = bbr_calc_thresh_tlp(tp, bbr, rsm, srtt, cts); 683 if (thresh > time_since_sent) 684 to = thresh - time_since_sent; 685 else 686 to = bbr->r_ctl.rc_min_to; 687 if (to > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 688 /* 689 * If the TLP time works out to larger than the max 690 * RTO lets not do TLP.. just RTO. 691 */ 692 goto activate_rxt; 693 } 694 if ((bbr->rc_tlp_rtx_out == 1) && 695 (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq)) { 696 /* 697 * Second retransmit of the same TLP 698 * lets not. 699 */ 700 bbr->rc_tlp_rtx_out = 0; 701 goto activate_rxt; 702 } 703 if (rsm->r_start != bbr->r_ctl.rc_last_tlp_seq) { 704 /* 705 * The tail is no longer the last one I did a probe 706 * on 707 */ 708 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 709 bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; 710 } 711 } 712 if (is_tlp_timer == 0) { 713 BBR_STAT_INC(bbr_to_arm_rack); 714 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RACK; 715 } else { 716 bbr_log_timer_var(bbr, 1, cts, time_since_sent, srtt, thresh, to); 717 if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { 718 /* 719 * We have exceeded how many times we can retran the 720 * current TLP timer, switch to the RTO timer. 721 */ 722 goto activate_rxt; 723 } else { 724 BBR_STAT_INC(bbr_to_arm_tlp); 725 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_TLP; 726 } 727 } 728 return (to); 729 } 730 731 static inline int32_t 732 bbr_minseg(struct tcp_bbr *bbr) 733 { 734 return (bbr->r_ctl.rc_pace_min_segs - bbr->rc_last_options); 735 } 736 737 static void 738 bbr_start_hpts_timer(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts, int32_t frm, int32_t slot, uint32_t tot_len) 739 { 740 struct inpcb *inp; 741 struct hpts_diag diag; 742 uint32_t delayed_ack = 0; 743 uint32_t left = 0; 744 uint32_t hpts_timeout; 745 uint8_t stopped; 746 int32_t delay_calc = 0; 747 uint32_t prev_delay = 0; 748 749 inp = tp->t_inpcb; 750 if (inp->inp_in_hpts) { 751 /* A previous call is already set up */ 752 return; 753 } 754 if ((tp->t_state == TCPS_CLOSED) || 755 (tp->t_state == TCPS_LISTEN)) { 756 return; 757 } 758 stopped = bbr->rc_tmr_stopped; 759 if (stopped && TSTMP_GT(bbr->r_ctl.rc_timer_exp, cts)) { 760 left = bbr->r_ctl.rc_timer_exp - cts; 761 } 762 bbr->r_ctl.rc_hpts_flags = 0; 763 bbr->r_ctl.rc_timer_exp = 0; 764 prev_delay = bbr->r_ctl.rc_last_delay_val; 765 if (bbr->r_ctl.rc_last_delay_val && 766 (slot == 0)) { 767 /* 768 * If a previous pacer delay was in place we 769 * are not coming from the output side (where 770 * we calculate a delay, more likely a timer). 771 */ 772 slot = bbr->r_ctl.rc_last_delay_val; 773 if (TSTMP_GT(cts, bbr->rc_pacer_started)) { 774 /* Compensate for time passed */ 775 delay_calc = cts - bbr->rc_pacer_started; 776 if (delay_calc <= slot) 777 slot -= delay_calc; 778 } 779 } 780 /* Do we have early to make up for by pushing out the pacing time? */ 781 if (bbr->r_agg_early_set) { 782 bbr_log_pacing_delay_calc(bbr, 0, bbr->r_ctl.rc_agg_early, cts, slot, 0, bbr->r_agg_early_set, 2); 783 slot += bbr->r_ctl.rc_agg_early; 784 bbr->r_ctl.rc_agg_early = 0; 785 bbr->r_agg_early_set = 0; 786 } 787 /* Are we running a total debt that needs to be compensated for? */ 788 if (bbr->r_ctl.rc_hptsi_agg_delay) { 789 if (slot > bbr->r_ctl.rc_hptsi_agg_delay) { 790 /* We nuke the delay */ 791 slot -= bbr->r_ctl.rc_hptsi_agg_delay; 792 bbr->r_ctl.rc_hptsi_agg_delay = 0; 793 } else { 794 /* We nuke some of the delay, put in a minimal 100usecs */ 795 bbr->r_ctl.rc_hptsi_agg_delay -= slot; 796 bbr->r_ctl.rc_last_delay_val = slot = 100; 797 } 798 } 799 bbr->r_ctl.rc_last_delay_val = slot; 800 hpts_timeout = bbr_timer_start(tp, bbr, cts); 801 if (tp->t_flags & TF_DELACK) { 802 if (bbr->rc_in_persist == 0) { 803 delayed_ack = bbr_delack_time; 804 } else { 805 /* 806 * We are in persists and have 807 * gotten a new data element. 808 */ 809 if (hpts_timeout > bbr_delack_time) { 810 /* 811 * Lets make the persists timer (which acks) 812 * be the smaller of hpts_timeout and bbr_delack_time. 813 */ 814 hpts_timeout = bbr_delack_time; 815 } 816 } 817 } 818 if (delayed_ack && 819 ((hpts_timeout == 0) || 820 (delayed_ack < hpts_timeout))) { 821 /* We need a Delayed ack timer */ 822 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 823 hpts_timeout = delayed_ack; 824 } 825 if (slot) { 826 /* Mark that we have a pacing timer up */ 827 BBR_STAT_INC(bbr_paced_segments); 828 bbr->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT; 829 } 830 /* 831 * If no timers are going to run and we will fall off thfe hptsi 832 * wheel, we resort to a keep-alive timer if its configured. 833 */ 834 if ((hpts_timeout == 0) && 835 (slot == 0)) { 836 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && 837 (tp->t_state <= TCPS_CLOSING)) { 838 /* 839 * Ok we have no timer (persists, rack, tlp, rxt or 840 * del-ack), we don't have segments being paced. So 841 * all that is left is the keepalive timer. 842 */ 843 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 844 hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp)); 845 } else { 846 hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp)); 847 } 848 bbr->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP; 849 } 850 } 851 if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) == 852 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) { 853 /* 854 * RACK, TLP, persists and RXT timers all are restartable 855 * based on actions input .. i.e we received a packet (ack 856 * or sack) and that changes things (rw, or snd_una etc). 857 * Thus we can restart them with a new value. For 858 * keep-alive, delayed_ack we keep track of what was left 859 * and restart the timer with a smaller value. 860 */ 861 if (left < hpts_timeout) 862 hpts_timeout = left; 863 } 864 if (bbr->r_ctl.rc_incr_tmrs && slot && 865 (bbr->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) { 866 /* 867 * If configured to do so, and the timer is either 868 * the TLP or RXT timer, we need to increase the timeout 869 * by the pacing time. Consider the bottleneck at my 870 * machine as an example, we are sending something 871 * to start a TLP on. The last packet won't be emitted 872 * fully until the pacing time (the bottleneck will hold 873 * the data in place). Once the packet is emitted that 874 * is when we want to start waiting for the TLP. This 875 * is most evident with hardware pacing (where the nic 876 * is holding the packet(s) before emitting). But it 877 * can also show up in the network so we do it for all 878 * cases. Technically we would take off one packet from 879 * this extra delay but this is easier and being more 880 * conservative is probably better. 881 */ 882 hpts_timeout += slot; 883 } 884 if (hpts_timeout) { 885 /* 886 * Hack alert for now we can't time-out over 2147 seconds (a 887 * bit more than 35min) 888 */ 889 if (hpts_timeout > 0x7ffffffe) 890 hpts_timeout = 0x7ffffffe; 891 bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; 892 } else 893 bbr->r_ctl.rc_timer_exp = 0; 894 if ((slot) && 895 (bbr->rc_use_google || 896 bbr->output_error_seen || 897 (slot <= hpts_timeout)) ) { 898 /* 899 * Tell LRO that it can queue packets while 900 * we pace. 901 */ 902 bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; 903 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && 904 (bbr->rc_cwnd_limited == 0)) { 905 /* 906 * If we are not cwnd limited and we 907 * are running a rack timer we put on 908 * the do not disturbe even for sack. 909 */ 910 inp->inp_flags2 |= INP_DONT_SACK_QUEUE; 911 } else 912 inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; 913 bbr->rc_pacer_started = cts; 914 915 (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(slot), 916 __LINE__, &diag); 917 bbr->rc_timer_first = 0; 918 bbr->bbr_timer_src = frm; 919 bbr_log_to_start(bbr, cts, hpts_timeout, slot, 1); 920 bbr_log_hpts_diag(bbr, cts, &diag); 921 } else if (hpts_timeout) { 922 (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(hpts_timeout), 923 __LINE__, &diag); 924 /* 925 * We add the flag here as well if the slot is set, 926 * since hpts will call in to clear the queue first before 927 * calling the output routine (which does our timers). 928 * We don't want to set the flag if its just a timer 929 * else the arrival of data might (that causes us 930 * to send more) might get delayed. Imagine being 931 * on a keep-alive timer and a request comes in for 932 * more data. 933 */ 934 if (slot) 935 bbr->rc_pacer_started = cts; 936 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && 937 (bbr->rc_cwnd_limited == 0)) { 938 /* 939 * For a rack timer, don't wake us even 940 * if a sack arrives as long as we are 941 * not cwnd limited. 942 */ 943 bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; 944 inp->inp_flags2 |= INP_DONT_SACK_QUEUE; 945 } else { 946 /* All other timers wake us up */ 947 bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 948 inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; 949 } 950 bbr->bbr_timer_src = frm; 951 bbr_log_to_start(bbr, cts, hpts_timeout, slot, 0); 952 bbr_log_hpts_diag(bbr, cts, &diag); 953 bbr->rc_timer_first = 1; 954 } 955 bbr->rc_tmr_stopped = 0; 956 bbr_log_type_bbrsnd(bbr, tot_len, slot, delay_calc, cts, frm, prev_delay); 957 } 958 959 static void 960 bbr_timer_audit(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, struct sockbuf *sb) 961 { 962 /* 963 * We received an ack, and then did not call send or were bounced 964 * out due to the hpts was running. Now a timer is up as well, is it 965 * the right timer? 966 */ 967 struct inpcb *inp; 968 struct bbr_sendmap *rsm; 969 uint32_t hpts_timeout; 970 int tmr_up; 971 972 tmr_up = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; 973 if (bbr->rc_in_persist && (tmr_up == PACE_TMR_PERSIT)) 974 return; 975 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 976 if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) && 977 (tmr_up == PACE_TMR_RXT)) { 978 /* Should be an RXT */ 979 return; 980 } 981 inp = bbr->rc_inp; 982 if (rsm == NULL) { 983 /* Nothing outstanding? */ 984 if (tp->t_flags & TF_DELACK) { 985 if (tmr_up == PACE_TMR_DELACK) 986 /* 987 * We are supposed to have delayed ack up 988 * and we do 989 */ 990 return; 991 } else if (sbavail(&inp->inp_socket->so_snd) && 992 (tmr_up == PACE_TMR_RXT)) { 993 /* 994 * if we hit enobufs then we would expect the 995 * possiblity of nothing outstanding and the RXT up 996 * (and the hptsi timer). 997 */ 998 return; 999 } else if (((V_tcp_always_keepalive || 1000 inp->inp_socket->so_options & SO_KEEPALIVE) && 1001 (tp->t_state <= TCPS_CLOSING)) && 1002 (tmr_up == PACE_TMR_KEEP) && 1003 (tp->snd_max == tp->snd_una)) { 1004 /* We should have keep alive up and we do */ 1005 return; 1006 } 1007 } 1008 if (rsm && (rsm->r_flags & BBR_SACK_PASSED)) { 1009 if ((tp->t_flags & TF_SENTFIN) && 1010 ((tp->snd_max - tp->snd_una) == 1) && 1011 (rsm->r_flags & BBR_HAS_FIN)) { 1012 /* needs to be a RXT */ 1013 if (tmr_up == PACE_TMR_RXT) 1014 return; 1015 else 1016 goto wrong_timer; 1017 } else if (tmr_up == PACE_TMR_RACK) 1018 return; 1019 else 1020 goto wrong_timer; 1021 } else if (rsm && (tmr_up == PACE_TMR_RACK)) { 1022 /* Rack timer has priority if we have data out */ 1023 return; 1024 } else if (SEQ_GT(tp->snd_max, tp->snd_una) && 1025 ((tmr_up == PACE_TMR_TLP) || 1026 (tmr_up == PACE_TMR_RXT))) { 1027 /* 1028 * Either a TLP or RXT is fine if no sack-passed is in place 1029 * and data is outstanding. 1030 */ 1031 return; 1032 } else if (tmr_up == PACE_TMR_DELACK) { 1033 /* 1034 * If the delayed ack was going to go off before the 1035 * rtx/tlp/rack timer were going to expire, then that would 1036 * be the timer in control. Note we don't check the time 1037 * here trusting the code is correct. 1038 */ 1039 return; 1040 } 1041 if (SEQ_GT(tp->snd_max, tp->snd_una) && 1042 ((tmr_up == PACE_TMR_RXT) || 1043 (tmr_up == PACE_TMR_TLP) || 1044 (tmr_up == PACE_TMR_RACK))) { 1045 /* 1046 * We have outstanding data and 1047 * we *do* have a RACK, TLP or RXT 1048 * timer running. We won't restart 1049 * anything here since thats probably ok we 1050 * will get called with some timer here shortly. 1051 */ 1052 return; 1053 } 1054 /* 1055 * Ok the timer originally started is not what we want now. We will 1056 * force the hpts to be stopped if any, and restart with the slot 1057 * set to what was in the saved slot. 1058 */ 1059 wrong_timer: 1060 if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) { 1061 if (inp->inp_in_hpts) 1062 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 1063 bbr_timer_cancel(bbr, __LINE__, cts); 1064 bbr_start_hpts_timer(bbr, tp, cts, 1, bbr->r_ctl.rc_last_delay_val, 1065 0); 1066 } else { 1067 /* 1068 * Output is hptsi so we just need to switch the type of 1069 * timer. We don't bother with keep-alive, since when we 1070 * jump through the output, it will start the keep-alive if 1071 * nothing is sent. 1072 * 1073 * We only need a delayed-ack added and or the hpts_timeout. 1074 */ 1075 hpts_timeout = bbr_timer_start(tp, bbr, cts); 1076 if (tp->t_flags & TF_DELACK) { 1077 if (hpts_timeout == 0) { 1078 hpts_timeout = bbr_delack_time; 1079 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 1080 } 1081 else if (hpts_timeout > bbr_delack_time) { 1082 hpts_timeout = bbr_delack_time; 1083 bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; 1084 } 1085 } 1086 if (hpts_timeout) { 1087 if (hpts_timeout > 0x7ffffffe) 1088 hpts_timeout = 0x7ffffffe; 1089 bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; 1090 } 1091 } 1092 } 1093 1094 int32_t bbr_clear_lost = 0; 1095 1096 /* 1097 * Considers the two time values now (cts) and earlier. 1098 * If cts is smaller than earlier, we could have 1099 * had a sequence wrap (our counter wraps every 1100 * 70 min or so) or it could be just clock skew 1101 * getting us two differnt time values. Clock skew 1102 * will show up within 10ms or so. So in such 1103 * a case (where cts is behind earlier time by 1104 * less than 10ms) we return 0. Otherwise we 1105 * return the true difference between them. 1106 */ 1107 static inline uint32_t 1108 bbr_calc_time(uint32_t cts, uint32_t earlier_time) { 1109 /* 1110 * Given two timestamps, the current time stamp cts, and some other 1111 * time-stamp taken in theory earlier return the difference. The 1112 * trick is here sometimes locking will get the other timestamp 1113 * after the cts. If this occurs we need to return 0. 1114 */ 1115 if (TSTMP_GEQ(cts, earlier_time)) 1116 return (cts - earlier_time); 1117 /* 1118 * cts is behind earlier_time if its less than 10ms consider it 0. 1119 * If its more than 10ms difference then we had a time wrap. Else 1120 * its just the normal locking foo. I wonder if we should not go to 1121 * 64bit TS and get rid of this issue. 1122 */ 1123 if (TSTMP_GEQ((cts + 10000), earlier_time)) 1124 return (0); 1125 /* 1126 * Ok the time must have wrapped. So we need to answer a large 1127 * amount of time, which the normal subtraction should do. 1128 */ 1129 return (cts - earlier_time); 1130 } 1131 1132 static int 1133 sysctl_bbr_clear_lost(SYSCTL_HANDLER_ARGS) 1134 { 1135 uint32_t stat; 1136 int32_t error; 1137 1138 error = SYSCTL_OUT(req, &bbr_clear_lost, sizeof(uint32_t)); 1139 if (error || req->newptr == NULL) 1140 return error; 1141 1142 error = SYSCTL_IN(req, &stat, sizeof(uint32_t)); 1143 if (error) 1144 return (error); 1145 if (stat == 1) { 1146 #ifdef BBR_INVARIANTS 1147 printf("Clearing BBR lost counters\n"); 1148 #endif 1149 COUNTER_ARRAY_ZERO(bbr_state_lost, BBR_MAX_STAT); 1150 COUNTER_ARRAY_ZERO(bbr_state_time, BBR_MAX_STAT); 1151 COUNTER_ARRAY_ZERO(bbr_state_resend, BBR_MAX_STAT); 1152 } else if (stat == 2) { 1153 #ifdef BBR_INVARIANTS 1154 printf("Clearing BBR option counters\n"); 1155 #endif 1156 COUNTER_ARRAY_ZERO(bbr_opts_arry, BBR_OPTS_SIZE); 1157 } else if (stat == 3) { 1158 #ifdef BBR_INVARIANTS 1159 printf("Clearing BBR stats counters\n"); 1160 #endif 1161 COUNTER_ARRAY_ZERO(bbr_stat_arry, BBR_STAT_SIZE); 1162 } else if (stat == 4) { 1163 #ifdef BBR_INVARIANTS 1164 printf("Clearing BBR out-size counters\n"); 1165 #endif 1166 COUNTER_ARRAY_ZERO(bbr_out_size, TCP_MSS_ACCT_SIZE); 1167 } 1168 bbr_clear_lost = 0; 1169 return (0); 1170 } 1171 1172 static void 1173 bbr_init_sysctls(void) 1174 { 1175 struct sysctl_oid *bbr_probertt; 1176 struct sysctl_oid *bbr_hptsi; 1177 struct sysctl_oid *bbr_measure; 1178 struct sysctl_oid *bbr_cwnd; 1179 struct sysctl_oid *bbr_timeout; 1180 struct sysctl_oid *bbr_states; 1181 struct sysctl_oid *bbr_startup; 1182 struct sysctl_oid *bbr_policer; 1183 1184 /* Probe rtt controls */ 1185 bbr_probertt = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1186 SYSCTL_CHILDREN(bbr_sysctl_root), 1187 OID_AUTO, 1188 "probertt", 1189 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1190 ""); 1191 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1192 SYSCTL_CHILDREN(bbr_probertt), 1193 OID_AUTO, "gain", CTLFLAG_RW, 1194 &bbr_rttprobe_gain, 192, 1195 "What is the filter gain drop in probe_rtt (0=disable)?"); 1196 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1197 SYSCTL_CHILDREN(bbr_probertt), 1198 OID_AUTO, "cwnd", CTLFLAG_RW, 1199 &bbr_rtt_probe_cwndtarg, 4, 1200 "How many mss's are outstanding during probe-rtt"); 1201 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1202 SYSCTL_CHILDREN(bbr_probertt), 1203 OID_AUTO, "int", CTLFLAG_RW, 1204 &bbr_rtt_probe_limit, 4000000, 1205 "If RTT has not shrank in this many micro-seconds enter probe-rtt"); 1206 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1207 SYSCTL_CHILDREN(bbr_probertt), 1208 OID_AUTO, "mintime", CTLFLAG_RW, 1209 &bbr_rtt_probe_time, 200000, 1210 "How many microseconds in probe-rtt"); 1211 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1212 SYSCTL_CHILDREN(bbr_probertt), 1213 OID_AUTO, "filter_len_sec", CTLFLAG_RW, 1214 &bbr_filter_len_sec, 6, 1215 "How long in seconds does the rttProp filter run?"); 1216 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1217 SYSCTL_CHILDREN(bbr_probertt), 1218 OID_AUTO, "drain_rtt", CTLFLAG_RW, 1219 &bbr_drain_rtt, BBR_SRTT, 1220 "What is the drain rtt to use in probeRTT (rtt_prop=0, rtt_rack=1, rtt_pkt=2, rtt_srtt=3?"); 1221 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1222 SYSCTL_CHILDREN(bbr_probertt), 1223 OID_AUTO, "can_force", CTLFLAG_RW, 1224 &bbr_can_force_probertt, 0, 1225 "If we keep setting new low rtt's but delay going in probe-rtt can we force in??"); 1226 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1227 SYSCTL_CHILDREN(bbr_probertt), 1228 OID_AUTO, "enter_sets_force", CTLFLAG_RW, 1229 &bbr_probertt_sets_rtt, 0, 1230 "In NF mode, do we imitate google_mode and set the rttProp on entry to probe-rtt?"); 1231 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1232 SYSCTL_CHILDREN(bbr_probertt), 1233 OID_AUTO, "can_adjust", CTLFLAG_RW, 1234 &bbr_can_adjust_probertt, 1, 1235 "Can we dynamically adjust the probe-rtt limits and times?"); 1236 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1237 SYSCTL_CHILDREN(bbr_probertt), 1238 OID_AUTO, "is_ratio", CTLFLAG_RW, 1239 &bbr_is_ratio, 0, 1240 "is the limit to filter a ratio?"); 1241 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1242 SYSCTL_CHILDREN(bbr_probertt), 1243 OID_AUTO, "use_cwnd", CTLFLAG_RW, 1244 &bbr_prtt_slam_cwnd, 0, 1245 "Should we set/recover cwnd?"); 1246 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1247 SYSCTL_CHILDREN(bbr_probertt), 1248 OID_AUTO, "can_use_ts", CTLFLAG_RW, 1249 &bbr_can_use_ts_for_rtt, 1, 1250 "Can we use the ms timestamp if available for retransmistted rtt calculations?"); 1251 1252 /* Pacing controls */ 1253 bbr_hptsi = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1254 SYSCTL_CHILDREN(bbr_sysctl_root), 1255 OID_AUTO, 1256 "pacing", 1257 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1258 ""); 1259 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1260 SYSCTL_CHILDREN(bbr_hptsi), 1261 OID_AUTO, "hw_pacing", CTLFLAG_RW, 1262 &bbr_allow_hdwr_pacing, 1, 1263 "Do we allow hardware pacing?"); 1264 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1265 SYSCTL_CHILDREN(bbr_hptsi), 1266 OID_AUTO, "hw_pacing_limit", CTLFLAG_RW, 1267 &bbr_hardware_pacing_limit, 4000, 1268 "Do we have a limited number of connections for pacing chelsio (0=no limit)?"); 1269 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1270 SYSCTL_CHILDREN(bbr_hptsi), 1271 OID_AUTO, "hw_pacing_adj", CTLFLAG_RW, 1272 &bbr_hdwr_pace_adjust, 2, 1273 "Multiplier to calculated tso size?"); 1274 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1275 SYSCTL_CHILDREN(bbr_hptsi), 1276 OID_AUTO, "hw_pacing_floor", CTLFLAG_RW, 1277 &bbr_hdwr_pace_floor, 1, 1278 "Do we invoke the hardware pacing floor?"); 1279 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1280 SYSCTL_CHILDREN(bbr_hptsi), 1281 OID_AUTO, "hw_pacing_delay_cnt", CTLFLAG_RW, 1282 &bbr_hdwr_pacing_delay_cnt, 10, 1283 "How many packets must be sent after hdwr pacing is enabled"); 1284 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1285 SYSCTL_CHILDREN(bbr_hptsi), 1286 OID_AUTO, "bw_cross", CTLFLAG_RW, 1287 &bbr_cross_over, 3000000, 1288 "What is the point where we cross over to linux like TSO size set"); 1289 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1290 SYSCTL_CHILDREN(bbr_hptsi), 1291 OID_AUTO, "seg_deltarg", CTLFLAG_RW, 1292 &bbr_hptsi_segments_delay_tar, 7000, 1293 "What is the worse case delay target for hptsi < 48Mbp connections"); 1294 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1295 SYSCTL_CHILDREN(bbr_hptsi), 1296 OID_AUTO, "enet_oh", CTLFLAG_RW, 1297 &bbr_include_enet_oh, 0, 1298 "Do we include the ethernet overhead in calculating pacing delay?"); 1299 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1300 SYSCTL_CHILDREN(bbr_hptsi), 1301 OID_AUTO, "ip_oh", CTLFLAG_RW, 1302 &bbr_include_ip_oh, 1, 1303 "Do we include the IP overhead in calculating pacing delay?"); 1304 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1305 SYSCTL_CHILDREN(bbr_hptsi), 1306 OID_AUTO, "tcp_oh", CTLFLAG_RW, 1307 &bbr_include_tcp_oh, 0, 1308 "Do we include the TCP overhead in calculating pacing delay?"); 1309 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1310 SYSCTL_CHILDREN(bbr_hptsi), 1311 OID_AUTO, "google_discount", CTLFLAG_RW, 1312 &bbr_google_discount, 10, 1313 "What is the default google discount percentage wise for pacing (11 = 1.1%%)?"); 1314 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1315 SYSCTL_CHILDREN(bbr_hptsi), 1316 OID_AUTO, "all_get_min", CTLFLAG_RW, 1317 &bbr_all_get_min, 0, 1318 "If you are less than a MSS do you just get the min?"); 1319 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1320 SYSCTL_CHILDREN(bbr_hptsi), 1321 OID_AUTO, "tso_min", CTLFLAG_RW, 1322 &bbr_hptsi_bytes_min, 1460, 1323 "For 0 -> 24Mbps what is floor number of segments for TSO"); 1324 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1325 SYSCTL_CHILDREN(bbr_hptsi), 1326 OID_AUTO, "seg_tso_max", CTLFLAG_RW, 1327 &bbr_hptsi_segments_max, 6, 1328 "For 0 -> 24Mbps what is top number of segments for TSO"); 1329 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1330 SYSCTL_CHILDREN(bbr_hptsi), 1331 OID_AUTO, "seg_floor", CTLFLAG_RW, 1332 &bbr_hptsi_segments_floor, 1, 1333 "Minimum TSO size we will fall too in segments"); 1334 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1335 SYSCTL_CHILDREN(bbr_hptsi), 1336 OID_AUTO, "utter_max", CTLFLAG_RW, 1337 &bbr_hptsi_utter_max, 0, 1338 "The absolute maximum that any pacing (outside of hardware) can be"); 1339 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1340 SYSCTL_CHILDREN(bbr_hptsi), 1341 OID_AUTO, "seg_divisor", CTLFLAG_RW, 1342 &bbr_hptsi_per_second, 100, 1343 "What is the divisor in our hptsi TSO calculation 512Mbps < X > 24Mbps "); 1344 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1345 SYSCTL_CHILDREN(bbr_hptsi), 1346 OID_AUTO, "srtt_mul", CTLFLAG_RW, 1347 &bbr_hptsi_max_mul, 1, 1348 "The multiplier for pace len max"); 1349 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1350 SYSCTL_CHILDREN(bbr_hptsi), 1351 OID_AUTO, "srtt_div", CTLFLAG_RW, 1352 &bbr_hptsi_max_div, 2, 1353 "The divisor for pace len max"); 1354 /* Measurement controls */ 1355 bbr_measure = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1356 SYSCTL_CHILDREN(bbr_sysctl_root), 1357 OID_AUTO, 1358 "measure", 1359 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1360 "Measurement controls"); 1361 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1362 SYSCTL_CHILDREN(bbr_measure), 1363 OID_AUTO, "min_i_bw", CTLFLAG_RW, 1364 &bbr_initial_bw_bps, 62500, 1365 "Minimum initial b/w in bytes per second"); 1366 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1367 SYSCTL_CHILDREN(bbr_measure), 1368 OID_AUTO, "no_sack_needed", CTLFLAG_RW, 1369 &bbr_sack_not_required, 0, 1370 "Do we allow bbr to run on connections not supporting SACK?"); 1371 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1372 SYSCTL_CHILDREN(bbr_measure), 1373 OID_AUTO, "use_google", CTLFLAG_RW, 1374 &bbr_use_google_algo, 0, 1375 "Use has close to google V1.0 has possible?"); 1376 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1377 SYSCTL_CHILDREN(bbr_measure), 1378 OID_AUTO, "ts_limiting", CTLFLAG_RW, 1379 &bbr_ts_limiting, 1, 1380 "Do we attempt to use the peers timestamp to limit b/w caculations?"); 1381 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1382 SYSCTL_CHILDREN(bbr_measure), 1383 OID_AUTO, "ts_can_raise", CTLFLAG_RW, 1384 &bbr_ts_can_raise, 0, 1385 "Can we raise the b/w via timestamp b/w calculation?"); 1386 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1387 SYSCTL_CHILDREN(bbr_measure), 1388 OID_AUTO, "ts_delta", CTLFLAG_RW, 1389 &bbr_min_usec_delta, 20000, 1390 "How long in usec between ts of our sends in ts validation code?"); 1391 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1392 SYSCTL_CHILDREN(bbr_measure), 1393 OID_AUTO, "ts_peer_delta", CTLFLAG_RW, 1394 &bbr_min_peer_delta, 20, 1395 "What min numerical value should be between the peer deltas?"); 1396 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1397 SYSCTL_CHILDREN(bbr_measure), 1398 OID_AUTO, "ts_delta_percent", CTLFLAG_RW, 1399 &bbr_delta_percent, 150, 1400 "What percentage (150 = 15.0) do we allow variance for?"); 1401 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1402 SYSCTL_CHILDREN(bbr_measure), 1403 OID_AUTO, "min_measure_good_bw", CTLFLAG_RW, 1404 &bbr_min_measurements_req, 1, 1405 "What is the minimum measurment count we need before we switch to our b/w estimate"); 1406 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1407 SYSCTL_CHILDREN(bbr_measure), 1408 OID_AUTO, "min_measure_before_pace", CTLFLAG_RW, 1409 &bbr_no_pacing_until, 4, 1410 "How many pkt-epoch's (0 is off) do we need before pacing is on?"); 1411 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1412 SYSCTL_CHILDREN(bbr_measure), 1413 OID_AUTO, "quanta", CTLFLAG_RW, 1414 &bbr_quanta, 2, 1415 "Extra quanta to add when calculating the target (ID section 4.2.3.2)."); 1416 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1417 SYSCTL_CHILDREN(bbr_measure), 1418 OID_AUTO, "noretran", CTLFLAG_RW, 1419 &bbr_no_retran, 0, 1420 "Should google mode not use retransmission measurements for the b/w estimation?"); 1421 /* State controls */ 1422 bbr_states = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1423 SYSCTL_CHILDREN(bbr_sysctl_root), 1424 OID_AUTO, 1425 "states", 1426 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1427 "State controls"); 1428 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1429 SYSCTL_CHILDREN(bbr_states), 1430 OID_AUTO, "idle_restart", CTLFLAG_RW, 1431 &bbr_uses_idle_restart, 0, 1432 "Do we use a new special idle_restart state to ramp back up quickly?"); 1433 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1434 SYSCTL_CHILDREN(bbr_states), 1435 OID_AUTO, "idle_restart_threshold", CTLFLAG_RW, 1436 &bbr_idle_restart_threshold, 100000, 1437 "How long must we be idle before we restart??"); 1438 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1439 SYSCTL_CHILDREN(bbr_states), 1440 OID_AUTO, "use_pkt_epoch", CTLFLAG_RW, 1441 &bbr_state_is_pkt_epoch, 0, 1442 "Do we use a pkt-epoch for substate if 0 rttProp?"); 1443 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1444 SYSCTL_CHILDREN(bbr_states), 1445 OID_AUTO, "startup_rtt_gain", CTLFLAG_RW, 1446 &bbr_rtt_gain_thresh, 0, 1447 "What increase in RTT triggers us to stop ignoring no-loss and possibly exit startup?"); 1448 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1449 SYSCTL_CHILDREN(bbr_states), 1450 OID_AUTO, "drain_floor", CTLFLAG_RW, 1451 &bbr_drain_floor, 88, 1452 "What is the lowest we can drain (pg) too?"); 1453 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1454 SYSCTL_CHILDREN(bbr_states), 1455 OID_AUTO, "drain_2_target", CTLFLAG_RW, 1456 &bbr_state_drain_2_tar, 1, 1457 "Do we drain to target in drain substate?"); 1458 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1459 SYSCTL_CHILDREN(bbr_states), 1460 OID_AUTO, "gain_2_target", CTLFLAG_RW, 1461 &bbr_gain_to_target, 1, 1462 "Does probe bw gain to target??"); 1463 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1464 SYSCTL_CHILDREN(bbr_states), 1465 OID_AUTO, "gain_extra_time", CTLFLAG_RW, 1466 &bbr_gain_gets_extra_too, 1, 1467 "Does probe bw gain get the extra time too?"); 1468 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1469 SYSCTL_CHILDREN(bbr_states), 1470 OID_AUTO, "ld_div", CTLFLAG_RW, 1471 &bbr_drain_drop_div, 5, 1472 "Long drain drop divider?"); 1473 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1474 SYSCTL_CHILDREN(bbr_states), 1475 OID_AUTO, "ld_mul", CTLFLAG_RW, 1476 &bbr_drain_drop_mul, 4, 1477 "Long drain drop multiplier?"); 1478 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1479 SYSCTL_CHILDREN(bbr_states), 1480 OID_AUTO, "rand_ot_disc", CTLFLAG_RW, 1481 &bbr_rand_ot, 50, 1482 "Random discount of the ot?"); 1483 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1484 SYSCTL_CHILDREN(bbr_states), 1485 OID_AUTO, "dr_filter_life", CTLFLAG_RW, 1486 &bbr_num_pktepo_for_del_limit, BBR_NUM_RTTS_FOR_DEL_LIMIT, 1487 "How many packet-epochs does the b/w delivery rate last?"); 1488 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1489 SYSCTL_CHILDREN(bbr_states), 1490 OID_AUTO, "subdrain_applimited", CTLFLAG_RW, 1491 &bbr_sub_drain_app_limit, 0, 1492 "Does our sub-state drain invoke app limited if its long?"); 1493 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1494 SYSCTL_CHILDREN(bbr_states), 1495 OID_AUTO, "use_cwnd_subdrain", CTLFLAG_RW, 1496 &bbr_sub_drain_slam_cwnd, 0, 1497 "Should we set/recover cwnd for sub-state drain?"); 1498 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1499 SYSCTL_CHILDREN(bbr_states), 1500 OID_AUTO, "use_cwnd_maindrain", CTLFLAG_RW, 1501 &bbr_slam_cwnd_in_main_drain, 0, 1502 "Should we set/recover cwnd for main-state drain?"); 1503 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1504 SYSCTL_CHILDREN(bbr_states), 1505 OID_AUTO, "google_gets_earlyout", CTLFLAG_RW, 1506 &google_allow_early_out, 1, 1507 "Should we allow google probe-bw/drain to exit early at flight target?"); 1508 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1509 SYSCTL_CHILDREN(bbr_states), 1510 OID_AUTO, "google_exit_loss", CTLFLAG_RW, 1511 &google_consider_lost, 1, 1512 "Should we have losses exit gain of probebw in google mode??"); 1513 /* Startup controls */ 1514 bbr_startup = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1515 SYSCTL_CHILDREN(bbr_sysctl_root), 1516 OID_AUTO, 1517 "startup", 1518 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1519 "Startup controls"); 1520 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1521 SYSCTL_CHILDREN(bbr_startup), 1522 OID_AUTO, "cheat_iwnd", CTLFLAG_RW, 1523 &bbr_sends_full_iwnd, 1, 1524 "Do we not pace but burst out initial windows has our TSO size?"); 1525 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1526 SYSCTL_CHILDREN(bbr_startup), 1527 OID_AUTO, "loss_threshold", CTLFLAG_RW, 1528 &bbr_startup_loss_thresh, 2000, 1529 "In startup what is the loss threshold in a pe that will exit us from startup?"); 1530 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1531 SYSCTL_CHILDREN(bbr_startup), 1532 OID_AUTO, "use_lowerpg", CTLFLAG_RW, 1533 &bbr_use_lower_gain_in_startup, 1, 1534 "Should we use a lower hptsi gain if we see loss in startup?"); 1535 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1536 SYSCTL_CHILDREN(bbr_startup), 1537 OID_AUTO, "gain", CTLFLAG_RW, 1538 &bbr_start_exit, 25, 1539 "What gain percent do we need to see to stay in startup??"); 1540 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1541 SYSCTL_CHILDREN(bbr_startup), 1542 OID_AUTO, "low_gain", CTLFLAG_RW, 1543 &bbr_low_start_exit, 15, 1544 "What gain percent do we need to see to stay in the lower gain startup??"); 1545 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1546 SYSCTL_CHILDREN(bbr_startup), 1547 OID_AUTO, "loss_exit", CTLFLAG_RW, 1548 &bbr_exit_startup_at_loss, 1, 1549 "Should we exit startup at loss in an epoch if we are not gaining?"); 1550 /* CWND controls */ 1551 bbr_cwnd = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1552 SYSCTL_CHILDREN(bbr_sysctl_root), 1553 OID_AUTO, 1554 "cwnd", 1555 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1556 "Cwnd controls"); 1557 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1558 SYSCTL_CHILDREN(bbr_cwnd), 1559 OID_AUTO, "tar_rtt", CTLFLAG_RW, 1560 &bbr_cwndtarget_rtt_touse, 0, 1561 "Target cwnd rtt measurment to use (0=rtt_prop, 1=rtt_rack, 2=pkt_rtt, 3=srtt)?"); 1562 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1563 SYSCTL_CHILDREN(bbr_cwnd), 1564 OID_AUTO, "may_shrink", CTLFLAG_RW, 1565 &bbr_cwnd_may_shrink, 0, 1566 "Can the cwnd shrink if it would grow to more than the target?"); 1567 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1568 SYSCTL_CHILDREN(bbr_cwnd), 1569 OID_AUTO, "max_target_limit", CTLFLAG_RW, 1570 &bbr_target_cwnd_mult_limit, 8, 1571 "Do we limit the cwnd to some multiple of the cwnd target if cwnd can't shrink 0=no?"); 1572 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1573 SYSCTL_CHILDREN(bbr_cwnd), 1574 OID_AUTO, "highspeed_min", CTLFLAG_RW, 1575 &bbr_cwnd_min_val_hs, BBR_HIGHSPEED_NUM_MSS, 1576 "What is the high-speed min cwnd (rttProp under 1ms)"); 1577 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1578 SYSCTL_CHILDREN(bbr_cwnd), 1579 OID_AUTO, "lowspeed_min", CTLFLAG_RW, 1580 &bbr_cwnd_min_val, BBR_PROBERTT_NUM_MSS, 1581 "What is the min cwnd (rttProp > 1ms)"); 1582 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1583 SYSCTL_CHILDREN(bbr_cwnd), 1584 OID_AUTO, "initwin", CTLFLAG_RW, 1585 &bbr_def_init_win, 10, 1586 "What is the BBR initial window, if 0 use tcp version"); 1587 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1588 SYSCTL_CHILDREN(bbr_cwnd), 1589 OID_AUTO, "do_loss_red", CTLFLAG_RW, 1590 &bbr_do_red, 600, 1591 "Do we reduce the b/w at exit from recovery based on ratio of prop/srtt (800=80.0, 0=off)?"); 1592 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1593 SYSCTL_CHILDREN(bbr_cwnd), 1594 OID_AUTO, "red_scale", CTLFLAG_RW, 1595 &bbr_red_scale, 20000, 1596 "What RTT do we scale with?"); 1597 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1598 SYSCTL_CHILDREN(bbr_cwnd), 1599 OID_AUTO, "red_growslow", CTLFLAG_RW, 1600 &bbr_red_growth_restrict, 1, 1601 "Do we restrict cwnd growth for whats in flight?"); 1602 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1603 SYSCTL_CHILDREN(bbr_cwnd), 1604 OID_AUTO, "red_div", CTLFLAG_RW, 1605 &bbr_red_div, 2, 1606 "If we reduce whats the divisor?"); 1607 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1608 SYSCTL_CHILDREN(bbr_cwnd), 1609 OID_AUTO, "red_mul", CTLFLAG_RW, 1610 &bbr_red_mul, 1, 1611 "If we reduce whats the mulitiplier?"); 1612 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1613 SYSCTL_CHILDREN(bbr_cwnd), 1614 OID_AUTO, "target_is_unit", CTLFLAG_RW, 1615 &bbr_target_is_bbunit, 0, 1616 "Is the state target the pacing_gain or BBR_UNIT?"); 1617 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1618 SYSCTL_CHILDREN(bbr_cwnd), 1619 OID_AUTO, "drop_limit", CTLFLAG_RW, 1620 &bbr_drop_limit, 0, 1621 "Number of segments limit for drop (0=use min_cwnd w/flight)?"); 1622 1623 /* Timeout controls */ 1624 bbr_timeout = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1625 SYSCTL_CHILDREN(bbr_sysctl_root), 1626 OID_AUTO, 1627 "timeout", 1628 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1629 "Time out controls"); 1630 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1631 SYSCTL_CHILDREN(bbr_timeout), 1632 OID_AUTO, "delack", CTLFLAG_RW, 1633 &bbr_delack_time, 100000, 1634 "BBR's delayed ack time"); 1635 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1636 SYSCTL_CHILDREN(bbr_timeout), 1637 OID_AUTO, "tlp_uses", CTLFLAG_RW, 1638 &bbr_tlp_type_to_use, 3, 1639 "RTT that TLP uses in its calculations, 0=rttProp, 1=Rack_rtt, 2=pkt_rtt and 3=srtt"); 1640 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1641 SYSCTL_CHILDREN(bbr_timeout), 1642 OID_AUTO, "persmin", CTLFLAG_RW, 1643 &bbr_persist_min, 250000, 1644 "What is the minimum time in microseconds between persists"); 1645 SYSCTL_ADD_U32(&bbr_sysctl_ctx, 1646 SYSCTL_CHILDREN(bbr_timeout), 1647 OID_AUTO, "persmax", CTLFLAG_RW, 1648 &bbr_persist_max, 1000000, 1649 "What is the largest delay in microseconds between persists"); 1650 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1651 SYSCTL_CHILDREN(bbr_timeout), 1652 OID_AUTO, "tlp_minto", CTLFLAG_RW, 1653 &bbr_tlp_min, 10000, 1654 "TLP Min timeout in usecs"); 1655 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1656 SYSCTL_CHILDREN(bbr_timeout), 1657 OID_AUTO, "tlp_dack_time", CTLFLAG_RW, 1658 &bbr_delayed_ack_time, 200000, 1659 "TLP delayed ack compensation value"); 1660 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1661 SYSCTL_CHILDREN(bbr_sysctl_root), 1662 OID_AUTO, "minrto", CTLFLAG_RW, 1663 &bbr_rto_min_ms, 30, 1664 "Minimum RTO in ms"); 1665 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1666 SYSCTL_CHILDREN(bbr_timeout), 1667 OID_AUTO, "maxrto", CTLFLAG_RW, 1668 &bbr_rto_max_sec, 4, 1669 "Maxiumum RTO in seconds -- should be at least as large as min_rto"); 1670 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1671 SYSCTL_CHILDREN(bbr_timeout), 1672 OID_AUTO, "tlp_retry", CTLFLAG_RW, 1673 &bbr_tlp_max_resend, 2, 1674 "How many times does TLP retry a single segment or multiple with no ACK"); 1675 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1676 SYSCTL_CHILDREN(bbr_timeout), 1677 OID_AUTO, "minto", CTLFLAG_RW, 1678 &bbr_min_to, 1000, 1679 "Minimum rack timeout in useconds"); 1680 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1681 SYSCTL_CHILDREN(bbr_timeout), 1682 OID_AUTO, "pktdelay", CTLFLAG_RW, 1683 &bbr_pkt_delay, 1000, 1684 "Extra RACK time (in useconds) besides reordering thresh"); 1685 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1686 SYSCTL_CHILDREN(bbr_timeout), 1687 OID_AUTO, "incr_tmrs", CTLFLAG_RW, 1688 &bbr_incr_timers, 1, 1689 "Increase the RXT/TLP timer by the pacing time used?"); 1690 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1691 SYSCTL_CHILDREN(bbr_timeout), 1692 OID_AUTO, "rxtmark_sackpassed", CTLFLAG_RW, 1693 &bbr_marks_rxt_sack_passed, 0, 1694 "Mark sack passed on all those not ack'd when a RXT hits?"); 1695 /* Policer controls */ 1696 bbr_policer = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 1697 SYSCTL_CHILDREN(bbr_sysctl_root), 1698 OID_AUTO, 1699 "policer", 1700 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1701 "Policer controls"); 1702 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1703 SYSCTL_CHILDREN(bbr_policer), 1704 OID_AUTO, "detect_enable", CTLFLAG_RW, 1705 &bbr_policer_detection_enabled, 1, 1706 "Is policer detection enabled??"); 1707 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1708 SYSCTL_CHILDREN(bbr_policer), 1709 OID_AUTO, "min_pes", CTLFLAG_RW, 1710 &bbr_lt_intvl_min_rtts, 4, 1711 "Minimum number of PE's?"); 1712 SYSCTL_ADD_U64(&bbr_sysctl_ctx, 1713 SYSCTL_CHILDREN(bbr_policer), 1714 OID_AUTO, "bwdiff", CTLFLAG_RW, 1715 &bbr_lt_bw_diff, (4000/8), 1716 "Minimal bw diff?"); 1717 SYSCTL_ADD_U64(&bbr_sysctl_ctx, 1718 SYSCTL_CHILDREN(bbr_policer), 1719 OID_AUTO, "bwratio", CTLFLAG_RW, 1720 &bbr_lt_bw_ratio, 8, 1721 "Minimal bw diff?"); 1722 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1723 SYSCTL_CHILDREN(bbr_policer), 1724 OID_AUTO, "from_rack_rxt", CTLFLAG_RW, 1725 &bbr_policer_call_from_rack_to, 0, 1726 "Do we call the policer detection code from a rack-timeout?"); 1727 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1728 SYSCTL_CHILDREN(bbr_policer), 1729 OID_AUTO, "false_postive", CTLFLAG_RW, 1730 &bbr_lt_intvl_fp, 0, 1731 "What packet epoch do we do false-postive detection at (0=no)?"); 1732 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1733 SYSCTL_CHILDREN(bbr_policer), 1734 OID_AUTO, "loss_thresh", CTLFLAG_RW, 1735 &bbr_lt_loss_thresh, 196, 1736 "Loss threshold 196 = 19.6%?"); 1737 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1738 SYSCTL_CHILDREN(bbr_policer), 1739 OID_AUTO, "false_postive_thresh", CTLFLAG_RW, 1740 &bbr_lt_fd_thresh, 100, 1741 "What percentage is the false detection threshold (150=15.0)?"); 1742 /* All the rest */ 1743 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1744 SYSCTL_CHILDREN(bbr_sysctl_root), 1745 OID_AUTO, "cheat_rxt", CTLFLAG_RW, 1746 &bbr_use_rack_resend_cheat, 0, 1747 "Do we burst 1ms between sends on retransmissions (like rack)?"); 1748 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1749 SYSCTL_CHILDREN(bbr_sysctl_root), 1750 OID_AUTO, "error_paceout", CTLFLAG_RW, 1751 &bbr_error_base_paceout, 10000, 1752 "When we hit an error what is the min to pace out in usec's?"); 1753 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1754 SYSCTL_CHILDREN(bbr_sysctl_root), 1755 OID_AUTO, "kill_paceout", CTLFLAG_RW, 1756 &bbr_max_net_error_cnt, 10, 1757 "When we hit this many errors in a row, kill the session?"); 1758 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1759 SYSCTL_CHILDREN(bbr_sysctl_root), 1760 OID_AUTO, "data_after_close", CTLFLAG_RW, 1761 &bbr_ignore_data_after_close, 1, 1762 "Do we hold off sending a RST until all pending data is ack'd"); 1763 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1764 SYSCTL_CHILDREN(bbr_sysctl_root), 1765 OID_AUTO, "resend_use_tso", CTLFLAG_RW, 1766 &bbr_resends_use_tso, 0, 1767 "Can resends use TSO?"); 1768 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1769 SYSCTL_CHILDREN(bbr_sysctl_root), 1770 OID_AUTO, "sblklimit", CTLFLAG_RW, 1771 &bbr_sack_block_limit, 128, 1772 "When do we start ignoring small sack blocks"); 1773 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1774 SYSCTL_CHILDREN(bbr_sysctl_root), 1775 OID_AUTO, "bb_verbose", CTLFLAG_RW, 1776 &bbr_verbose_logging, 0, 1777 "Should BBR black box logging be verbose"); 1778 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1779 SYSCTL_CHILDREN(bbr_sysctl_root), 1780 OID_AUTO, "reorder_thresh", CTLFLAG_RW, 1781 &bbr_reorder_thresh, 2, 1782 "What factor for rack will be added when seeing reordering (shift right)"); 1783 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1784 SYSCTL_CHILDREN(bbr_sysctl_root), 1785 OID_AUTO, "reorder_fade", CTLFLAG_RW, 1786 &bbr_reorder_fade, 0, 1787 "Does reorder detection fade, if so how many ms (0 means never)"); 1788 SYSCTL_ADD_S32(&bbr_sysctl_ctx, 1789 SYSCTL_CHILDREN(bbr_sysctl_root), 1790 OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW, 1791 &bbr_tlp_thresh, 1, 1792 "what divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)"); 1793 /* Stats and counters */ 1794 /* The pacing counters for hdwr/software can't be in the array */ 1795 bbr_nohdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); 1796 bbr_hdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); 1797 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1798 SYSCTL_CHILDREN(bbr_sysctl_root), 1799 OID_AUTO, "enob_hdwr_pacing", CTLFLAG_RD, 1800 &bbr_hdwr_pacing_enobuf, 1801 "Total number of enobufs for hardware paced flows"); 1802 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1803 SYSCTL_CHILDREN(bbr_sysctl_root), 1804 OID_AUTO, "enob_no_hdwr_pacing", CTLFLAG_RD, 1805 &bbr_nohdwr_pacing_enobuf, 1806 "Total number of enobufs for non-hardware paced flows"); 1807 1808 bbr_flows_whdwr_pacing = counter_u64_alloc(M_WAITOK); 1809 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1810 SYSCTL_CHILDREN(bbr_sysctl_root), 1811 OID_AUTO, "hdwr_pacing", CTLFLAG_RD, 1812 &bbr_flows_whdwr_pacing, 1813 "Total number of hardware paced flows"); 1814 bbr_flows_nohdwr_pacing = counter_u64_alloc(M_WAITOK); 1815 SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, 1816 SYSCTL_CHILDREN(bbr_sysctl_root), 1817 OID_AUTO, "software_pacing", CTLFLAG_RD, 1818 &bbr_flows_nohdwr_pacing, 1819 "Total number of software paced flows"); 1820 COUNTER_ARRAY_ALLOC(bbr_stat_arry, BBR_STAT_SIZE, M_WAITOK); 1821 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1822 OID_AUTO, "stats", CTLFLAG_RD, 1823 bbr_stat_arry, BBR_STAT_SIZE, "BBR Stats"); 1824 COUNTER_ARRAY_ALLOC(bbr_opts_arry, BBR_OPTS_SIZE, M_WAITOK); 1825 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1826 OID_AUTO, "opts", CTLFLAG_RD, 1827 bbr_opts_arry, BBR_OPTS_SIZE, "BBR Option Stats"); 1828 COUNTER_ARRAY_ALLOC(bbr_state_lost, BBR_MAX_STAT, M_WAITOK); 1829 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1830 OID_AUTO, "lost", CTLFLAG_RD, 1831 bbr_state_lost, BBR_MAX_STAT, "Stats of when losses occur"); 1832 COUNTER_ARRAY_ALLOC(bbr_state_resend, BBR_MAX_STAT, M_WAITOK); 1833 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1834 OID_AUTO, "stateresend", CTLFLAG_RD, 1835 bbr_state_resend, BBR_MAX_STAT, "Stats of what states resend"); 1836 COUNTER_ARRAY_ALLOC(bbr_state_time, BBR_MAX_STAT, M_WAITOK); 1837 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1838 OID_AUTO, "statetime", CTLFLAG_RD, 1839 bbr_state_time, BBR_MAX_STAT, "Stats of time spent in the states"); 1840 COUNTER_ARRAY_ALLOC(bbr_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK); 1841 SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), 1842 OID_AUTO, "outsize", CTLFLAG_RD, 1843 bbr_out_size, TCP_MSS_ACCT_SIZE, "Size of output calls"); 1844 SYSCTL_ADD_PROC(&bbr_sysctl_ctx, 1845 SYSCTL_CHILDREN(bbr_sysctl_root), 1846 OID_AUTO, "clrlost", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, 1847 &bbr_clear_lost, 0, sysctl_bbr_clear_lost, "IU", "Clear lost counters"); 1848 } 1849 1850 static void 1851 bbr_counter_destroy(void) 1852 { 1853 COUNTER_ARRAY_FREE(bbr_stat_arry, BBR_STAT_SIZE); 1854 COUNTER_ARRAY_FREE(bbr_opts_arry, BBR_OPTS_SIZE); 1855 COUNTER_ARRAY_FREE(bbr_out_size, TCP_MSS_ACCT_SIZE); 1856 COUNTER_ARRAY_FREE(bbr_state_lost, BBR_MAX_STAT); 1857 COUNTER_ARRAY_FREE(bbr_state_time, BBR_MAX_STAT); 1858 COUNTER_ARRAY_FREE(bbr_state_resend, BBR_MAX_STAT); 1859 counter_u64_free(bbr_nohdwr_pacing_enobuf); 1860 counter_u64_free(bbr_hdwr_pacing_enobuf); 1861 counter_u64_free(bbr_flows_whdwr_pacing); 1862 counter_u64_free(bbr_flows_nohdwr_pacing); 1863 1864 } 1865 1866 static __inline void 1867 bbr_fill_in_logging_data(struct tcp_bbr *bbr, struct tcp_log_bbr *l, uint32_t cts) 1868 { 1869 memset(l, 0, sizeof(union tcp_log_stackspecific)); 1870 l->cur_del_rate = bbr->r_ctl.rc_bbr_cur_del_rate; 1871 l->delRate = get_filter_value(&bbr->r_ctl.rc_delrate); 1872 l->rttProp = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 1873 l->bw_inuse = bbr_get_bw(bbr); 1874 l->inflight = ctf_flight_size(bbr->rc_tp, 1875 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 1876 l->applimited = bbr->r_ctl.r_app_limited_until; 1877 l->delivered = bbr->r_ctl.rc_delivered; 1878 l->timeStamp = cts; 1879 l->lost = bbr->r_ctl.rc_lost; 1880 l->bbr_state = bbr->rc_bbr_state; 1881 l->bbr_substate = bbr_state_val(bbr); 1882 l->epoch = bbr->r_ctl.rc_rtt_epoch; 1883 l->lt_epoch = bbr->r_ctl.rc_lt_epoch; 1884 l->pacing_gain = bbr->r_ctl.rc_bbr_hptsi_gain; 1885 l->cwnd_gain = bbr->r_ctl.rc_bbr_cwnd_gain; 1886 l->inhpts = bbr->rc_inp->inp_in_hpts; 1887 l->ininput = bbr->rc_inp->inp_in_input; 1888 l->use_lt_bw = bbr->rc_lt_use_bw; 1889 l->pkts_out = bbr->r_ctl.rc_flight_at_input; 1890 l->pkt_epoch = bbr->r_ctl.rc_pkt_epoch; 1891 } 1892 1893 static void 1894 bbr_log_type_bw_reduce(struct tcp_bbr *bbr, int reason) 1895 { 1896 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1897 union tcp_log_stackspecific log; 1898 1899 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1900 log.u_bbr.flex1 = 0; 1901 log.u_bbr.flex2 = 0; 1902 log.u_bbr.flex5 = 0; 1903 log.u_bbr.flex3 = 0; 1904 log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_loss_rate; 1905 log.u_bbr.flex7 = reason; 1906 log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_enters_probertt; 1907 log.u_bbr.flex8 = 0; 1908 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1909 &bbr->rc_inp->inp_socket->so_rcv, 1910 &bbr->rc_inp->inp_socket->so_snd, 1911 BBR_LOG_BW_RED_EV, 0, 1912 0, &log, false, &bbr->rc_tv); 1913 } 1914 } 1915 1916 static void 1917 bbr_log_type_rwnd_collapse(struct tcp_bbr *bbr, int seq, int mode, uint32_t count) 1918 { 1919 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1920 union tcp_log_stackspecific log; 1921 1922 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1923 log.u_bbr.flex1 = seq; 1924 log.u_bbr.flex2 = count; 1925 log.u_bbr.flex8 = mode; 1926 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1927 &bbr->rc_inp->inp_socket->so_rcv, 1928 &bbr->rc_inp->inp_socket->so_snd, 1929 BBR_LOG_LOWGAIN, 0, 1930 0, &log, false, &bbr->rc_tv); 1931 } 1932 } 1933 1934 static void 1935 bbr_log_type_just_return(struct tcp_bbr *bbr, uint32_t cts, uint32_t tlen, uint8_t hpts_calling, 1936 uint8_t reason, uint32_t p_maxseg, int len) 1937 { 1938 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1939 union tcp_log_stackspecific log; 1940 1941 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 1942 log.u_bbr.flex1 = p_maxseg; 1943 log.u_bbr.flex2 = bbr->r_ctl.rc_hpts_flags; 1944 log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; 1945 log.u_bbr.flex4 = reason; 1946 log.u_bbr.flex5 = bbr->rc_in_persist; 1947 log.u_bbr.flex6 = bbr->r_ctl.rc_last_delay_val; 1948 log.u_bbr.flex7 = p_maxseg; 1949 log.u_bbr.flex8 = bbr->rc_in_persist; 1950 log.u_bbr.pkts_out = 0; 1951 log.u_bbr.applimited = len; 1952 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1953 &bbr->rc_inp->inp_socket->so_rcv, 1954 &bbr->rc_inp->inp_socket->so_snd, 1955 BBR_LOG_JUSTRET, 0, 1956 tlen, &log, false, &bbr->rc_tv); 1957 } 1958 } 1959 1960 static void 1961 bbr_log_type_enter_rec(struct tcp_bbr *bbr, uint32_t seq) 1962 { 1963 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 1964 union tcp_log_stackspecific log; 1965 1966 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 1967 log.u_bbr.flex1 = seq; 1968 log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; 1969 log.u_bbr.flex3 = bbr->r_ctl.rc_recovery_start; 1970 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 1971 &bbr->rc_inp->inp_socket->so_rcv, 1972 &bbr->rc_inp->inp_socket->so_snd, 1973 BBR_LOG_ENTREC, 0, 1974 0, &log, false, &bbr->rc_tv); 1975 } 1976 } 1977 1978 static void 1979 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) 1980 { 1981 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 1982 union tcp_log_stackspecific log; 1983 1984 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 1985 log.u_bbr.flex1 = tso; 1986 log.u_bbr.flex2 = maxseg; 1987 log.u_bbr.flex3 = mtu; 1988 log.u_bbr.flex4 = csum_flags; 1989 TCP_LOG_EVENTP(tp, NULL, 1990 &bbr->rc_inp->inp_socket->so_rcv, 1991 &bbr->rc_inp->inp_socket->so_snd, 1992 BBR_LOG_MSGSIZE, 0, 1993 0, &log, false, &bbr->rc_tv); 1994 } 1995 } 1996 1997 static void 1998 bbr_log_flowend(struct tcp_bbr *bbr) 1999 { 2000 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2001 union tcp_log_stackspecific log; 2002 struct sockbuf *r, *s; 2003 struct timeval tv; 2004 2005 if (bbr->rc_inp->inp_socket) { 2006 r = &bbr->rc_inp->inp_socket->so_rcv; 2007 s = &bbr->rc_inp->inp_socket->so_snd; 2008 } else { 2009 r = s = NULL; 2010 } 2011 bbr_fill_in_logging_data(bbr, &log.u_bbr, tcp_get_usecs(&tv)); 2012 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2013 r, s, 2014 TCP_LOG_FLOWEND, 0, 2015 0, &log, false, &tv); 2016 } 2017 } 2018 2019 static void 2020 bbr_log_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, 2021 uint32_t lost, uint32_t del) 2022 { 2023 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2024 union tcp_log_stackspecific log; 2025 2026 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2027 log.u_bbr.flex1 = lost; 2028 log.u_bbr.flex2 = del; 2029 log.u_bbr.flex3 = bbr->r_ctl.rc_bbr_lastbtlbw; 2030 log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_rtt; 2031 log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; 2032 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2033 log.u_bbr.flex7 = line; 2034 log.u_bbr.flex8 = 0; 2035 log.u_bbr.inflight = bbr->r_ctl.r_measurement_count; 2036 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2037 &bbr->rc_inp->inp_socket->so_rcv, 2038 &bbr->rc_inp->inp_socket->so_snd, 2039 BBR_LOG_PKT_EPOCH, 0, 2040 0, &log, false, &bbr->rc_tv); 2041 } 2042 } 2043 2044 static void 2045 bbr_log_time_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, uint32_t epoch_time) 2046 { 2047 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2048 union tcp_log_stackspecific log; 2049 2050 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2051 log.u_bbr.flex1 = bbr->r_ctl.rc_lost; 2052 log.u_bbr.flex2 = bbr->rc_inp->inp_socket->so_snd.sb_lowat; 2053 log.u_bbr.flex3 = bbr->rc_inp->inp_socket->so_snd.sb_hiwat; 2054 log.u_bbr.flex7 = line; 2055 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2056 &bbr->rc_inp->inp_socket->so_rcv, 2057 &bbr->rc_inp->inp_socket->so_snd, 2058 BBR_LOG_TIME_EPOCH, 0, 2059 0, &log, false, &bbr->rc_tv); 2060 } 2061 } 2062 2063 static void 2064 bbr_log_set_of_state_target(struct tcp_bbr *bbr, uint32_t new_tar, int line, int meth) 2065 { 2066 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2067 union tcp_log_stackspecific log; 2068 2069 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2070 log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; 2071 log.u_bbr.flex2 = new_tar; 2072 log.u_bbr.flex3 = line; 2073 log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; 2074 log.u_bbr.flex5 = bbr_quanta; 2075 log.u_bbr.flex6 = bbr->r_ctl.rc_pace_min_segs; 2076 log.u_bbr.flex7 = bbr->rc_last_options; 2077 log.u_bbr.flex8 = meth; 2078 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2079 &bbr->rc_inp->inp_socket->so_rcv, 2080 &bbr->rc_inp->inp_socket->so_snd, 2081 BBR_LOG_STATE_TARGET, 0, 2082 0, &log, false, &bbr->rc_tv); 2083 } 2084 2085 } 2086 2087 static void 2088 bbr_log_type_statechange(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2089 { 2090 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2091 union tcp_log_stackspecific log; 2092 2093 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2094 log.u_bbr.flex1 = line; 2095 log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; 2096 log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; 2097 if (bbr_state_is_pkt_epoch) 2098 log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); 2099 else 2100 log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PROP); 2101 log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; 2102 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2103 log.u_bbr.flex7 = (bbr->r_ctl.rc_target_at_state/1000); 2104 log.u_bbr.lt_epoch = bbr->r_ctl.rc_level_state_extra; 2105 log.u_bbr.pkts_out = bbr->r_ctl.rc_target_at_state; 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, 0, 2110 0, &log, false, &bbr->rc_tv); 2111 } 2112 } 2113 2114 static void 2115 bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, 2116 uint32_t rtt, uint32_t line, uint8_t reas, uint16_t cond) 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.last_in_probertt; 2125 log.u_bbr.flex4 = applied; 2126 log.u_bbr.flex5 = rtt; 2127 log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; 2128 log.u_bbr.flex7 = cond; 2129 log.u_bbr.flex8 = reas; 2130 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2131 &bbr->rc_inp->inp_socket->so_rcv, 2132 &bbr->rc_inp->inp_socket->so_snd, 2133 BBR_LOG_RTT_SHRINKS, 0, 2134 0, &log, false, &bbr->rc_tv); 2135 } 2136 } 2137 2138 static void 2139 bbr_log_type_exit_rec(struct tcp_bbr *bbr) 2140 { 2141 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2142 union tcp_log_stackspecific log; 2143 2144 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2145 log.u_bbr.flex1 = bbr->r_ctl.rc_recovery_start; 2146 log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; 2147 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2148 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2149 &bbr->rc_inp->inp_socket->so_rcv, 2150 &bbr->rc_inp->inp_socket->so_snd, 2151 BBR_LOG_EXITREC, 0, 2152 0, &log, false, &bbr->rc_tv); 2153 } 2154 } 2155 2156 static void 2157 bbr_log_type_cwndupd(struct tcp_bbr *bbr, uint32_t bytes_this_ack, uint32_t chg, 2158 uint32_t prev_acked, int32_t meth, uint32_t target, uint32_t th_ack, int32_t line) 2159 { 2160 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2161 union tcp_log_stackspecific log; 2162 2163 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2164 log.u_bbr.flex1 = line; 2165 log.u_bbr.flex2 = prev_acked; 2166 log.u_bbr.flex3 = bytes_this_ack; 2167 log.u_bbr.flex4 = chg; 2168 log.u_bbr.flex5 = th_ack; 2169 log.u_bbr.flex6 = target; 2170 log.u_bbr.flex8 = meth; 2171 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2172 &bbr->rc_inp->inp_socket->so_rcv, 2173 &bbr->rc_inp->inp_socket->so_snd, 2174 BBR_LOG_CWND, 0, 2175 0, &log, false, &bbr->rc_tv); 2176 } 2177 } 2178 2179 static void 2180 bbr_log_rtt_sample(struct tcp_bbr *bbr, uint32_t rtt, uint32_t tsin) 2181 { 2182 /* 2183 * Log the rtt sample we are applying to the srtt algorithm in 2184 * useconds. 2185 */ 2186 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2187 union tcp_log_stackspecific log; 2188 2189 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2190 log.u_bbr.flex1 = rtt; 2191 log.u_bbr.flex2 = bbr->r_ctl.rc_bbr_state_time; 2192 log.u_bbr.flex3 = bbr->r_ctl.rc_ack_hdwr_delay; 2193 log.u_bbr.flex4 = bbr->rc_tp->ts_offset; 2194 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2195 log.u_bbr.pkts_out = tcp_tv_to_mssectick(&bbr->rc_tv); 2196 log.u_bbr.flex6 = tsin; 2197 log.u_bbr.flex7 = 0; 2198 log.u_bbr.flex8 = bbr->rc_ack_was_delayed; 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 TCP_LOG_RTT, 0, 2203 0, &log, false, &bbr->rc_tv); 2204 } 2205 } 2206 2207 static void 2208 bbr_log_type_pesist(struct tcp_bbr *bbr, uint32_t cts, uint32_t time_in, int32_t line, uint8_t enter_exit) 2209 { 2210 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2211 union tcp_log_stackspecific log; 2212 2213 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2214 log.u_bbr.flex1 = time_in; 2215 log.u_bbr.flex2 = line; 2216 log.u_bbr.flex8 = enter_exit; 2217 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2218 &bbr->rc_inp->inp_socket->so_rcv, 2219 &bbr->rc_inp->inp_socket->so_snd, 2220 BBR_LOG_PERSIST, 0, 2221 0, &log, false, &bbr->rc_tv); 2222 } 2223 } 2224 static void 2225 bbr_log_ack_clear(struct tcp_bbr *bbr, uint32_t cts) 2226 { 2227 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2228 union tcp_log_stackspecific log; 2229 2230 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2231 log.u_bbr.flex1 = bbr->rc_tp->ts_recent_age; 2232 log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; 2233 log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; 2234 log.u_bbr.flex4 = bbr->r_ctl.rc_went_idle_time; 2235 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2236 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2237 &bbr->rc_inp->inp_socket->so_rcv, 2238 &bbr->rc_inp->inp_socket->so_snd, 2239 BBR_LOG_ACKCLEAR, 0, 2240 0, &log, false, &bbr->rc_tv); 2241 } 2242 } 2243 2244 static void 2245 bbr_log_ack_event(struct tcp_bbr *bbr, struct tcphdr *th, struct tcpopt *to, uint32_t tlen, 2246 uint16_t nsegs, uint32_t cts, int32_t nxt_pkt, struct mbuf *m) 2247 { 2248 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2249 union tcp_log_stackspecific log; 2250 struct timeval tv; 2251 2252 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2253 log.u_bbr.flex1 = nsegs; 2254 log.u_bbr.flex2 = bbr->r_ctl.rc_lost_bytes; 2255 if (m) { 2256 struct timespec ts; 2257 2258 log.u_bbr.flex3 = m->m_flags; 2259 if (m->m_flags & M_TSTMP) { 2260 mbuf_tstmp2timespec(m, &ts); 2261 tv.tv_sec = ts.tv_sec; 2262 tv.tv_usec = ts.tv_nsec / 1000; 2263 log.u_bbr.lt_epoch = tcp_tv_to_usectick(&tv); 2264 } else { 2265 log.u_bbr.lt_epoch = 0; 2266 } 2267 if (m->m_flags & M_TSTMP_LRO) { 2268 tv.tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000; 2269 tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000) / 1000; 2270 log.u_bbr.flex5 = tcp_tv_to_usectick(&tv); 2271 } else { 2272 /* No arrival timestamp */ 2273 log.u_bbr.flex5 = 0; 2274 } 2275 2276 log.u_bbr.pkts_out = tcp_get_usecs(&tv); 2277 } else { 2278 log.u_bbr.flex3 = 0; 2279 log.u_bbr.flex5 = 0; 2280 log.u_bbr.flex6 = 0; 2281 log.u_bbr.pkts_out = 0; 2282 } 2283 log.u_bbr.flex4 = bbr->r_ctl.rc_target_at_state; 2284 log.u_bbr.flex7 = bbr->r_wanted_output; 2285 log.u_bbr.flex8 = bbr->rc_in_persist; 2286 TCP_LOG_EVENTP(bbr->rc_tp, th, 2287 &bbr->rc_inp->inp_socket->so_rcv, 2288 &bbr->rc_inp->inp_socket->so_snd, 2289 TCP_LOG_IN, 0, 2290 tlen, &log, true, &bbr->rc_tv); 2291 } 2292 } 2293 2294 static void 2295 bbr_log_doseg_done(struct tcp_bbr *bbr, uint32_t cts, int32_t nxt_pkt, int32_t did_out) 2296 { 2297 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2298 union tcp_log_stackspecific log; 2299 2300 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2301 log.u_bbr.flex1 = did_out; 2302 log.u_bbr.flex2 = nxt_pkt; 2303 log.u_bbr.flex3 = bbr->r_ctl.rc_last_delay_val; 2304 log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; 2305 log.u_bbr.flex5 = bbr->r_ctl.rc_timer_exp; 2306 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_bytes; 2307 log.u_bbr.flex7 = bbr->r_wanted_output; 2308 log.u_bbr.flex8 = bbr->rc_in_persist; 2309 log.u_bbr.pkts_out = bbr->r_ctl.highest_hdwr_delay; 2310 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2311 &bbr->rc_inp->inp_socket->so_rcv, 2312 &bbr->rc_inp->inp_socket->so_snd, 2313 BBR_LOG_DOSEG_DONE, 0, 2314 0, &log, true, &bbr->rc_tv); 2315 } 2316 } 2317 2318 static void 2319 bbr_log_enobuf_jmp(struct tcp_bbr *bbr, uint32_t len, uint32_t cts, 2320 int32_t line, uint32_t o_len, uint32_t segcnt, uint32_t segsiz) 2321 { 2322 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2323 union tcp_log_stackspecific log; 2324 2325 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2326 log.u_bbr.flex1 = line; 2327 log.u_bbr.flex2 = o_len; 2328 log.u_bbr.flex3 = segcnt; 2329 log.u_bbr.flex4 = segsiz; 2330 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2331 &bbr->rc_inp->inp_socket->so_rcv, 2332 &bbr->rc_inp->inp_socket->so_snd, 2333 BBR_LOG_ENOBUF_JMP, ENOBUFS, 2334 len, &log, true, &bbr->rc_tv); 2335 } 2336 } 2337 2338 static void 2339 bbr_log_to_processing(struct tcp_bbr *bbr, uint32_t cts, int32_t ret, int32_t timers, uint8_t hpts_calling) 2340 { 2341 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2342 union tcp_log_stackspecific log; 2343 2344 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2345 log.u_bbr.flex1 = timers; 2346 log.u_bbr.flex2 = ret; 2347 log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; 2348 log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; 2349 log.u_bbr.flex5 = cts; 2350 log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; 2351 log.u_bbr.flex8 = hpts_calling; 2352 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2353 &bbr->rc_inp->inp_socket->so_rcv, 2354 &bbr->rc_inp->inp_socket->so_snd, 2355 BBR_LOG_TO_PROCESS, 0, 2356 0, &log, false, &bbr->rc_tv); 2357 } 2358 } 2359 2360 static void 2361 bbr_log_to_event(struct tcp_bbr *bbr, uint32_t cts, int32_t to_num) 2362 { 2363 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2364 union tcp_log_stackspecific log; 2365 uint64_t ar; 2366 2367 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2368 log.u_bbr.flex1 = bbr->bbr_timer_src; 2369 log.u_bbr.flex2 = 0; 2370 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2371 ar = (uint64_t)(bbr->r_ctl.rc_resend); 2372 ar >>= 32; 2373 ar &= 0x00000000ffffffff; 2374 log.u_bbr.flex4 = (uint32_t)ar; 2375 ar = (uint64_t)bbr->r_ctl.rc_resend; 2376 ar &= 0x00000000ffffffff; 2377 log.u_bbr.flex5 = (uint32_t)ar; 2378 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2379 log.u_bbr.flex8 = to_num; 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_RTO, 0, 2384 0, &log, false, &bbr->rc_tv); 2385 } 2386 } 2387 2388 static void 2389 bbr_log_startup_event(struct tcp_bbr *bbr, uint32_t cts, uint32_t flex1, uint32_t flex2, uint32_t flex3, uint8_t reason) 2390 { 2391 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2392 union tcp_log_stackspecific log; 2393 2394 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2395 log.u_bbr.flex1 = flex1; 2396 log.u_bbr.flex2 = flex2; 2397 log.u_bbr.flex3 = flex3; 2398 log.u_bbr.flex4 = 0; 2399 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2400 log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; 2401 log.u_bbr.flex8 = reason; 2402 log.u_bbr.cur_del_rate = bbr->r_ctl.rc_bbr_lastbtlbw; 2403 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2404 &bbr->rc_inp->inp_socket->so_rcv, 2405 &bbr->rc_inp->inp_socket->so_snd, 2406 BBR_LOG_REDUCE, 0, 2407 0, &log, false, &bbr->rc_tv); 2408 } 2409 } 2410 2411 static void 2412 bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag) 2413 { 2414 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2415 union tcp_log_stackspecific log; 2416 2417 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2418 log.u_bbr.flex1 = diag->p_nxt_slot; 2419 log.u_bbr.flex2 = diag->p_cur_slot; 2420 log.u_bbr.flex3 = diag->slot_req; 2421 log.u_bbr.flex4 = diag->inp_hptsslot; 2422 log.u_bbr.flex5 = diag->slot_remaining; 2423 log.u_bbr.flex6 = diag->need_new_to; 2424 log.u_bbr.flex7 = diag->p_hpts_active; 2425 log.u_bbr.flex8 = diag->p_on_min_sleep; 2426 /* Hijack other fields as needed */ 2427 log.u_bbr.epoch = diag->have_slept; 2428 log.u_bbr.lt_epoch = diag->yet_to_sleep; 2429 log.u_bbr.pkts_out = diag->co_ret; 2430 log.u_bbr.applimited = diag->hpts_sleep_time; 2431 log.u_bbr.delivered = diag->p_prev_slot; 2432 log.u_bbr.inflight = diag->p_runningtick; 2433 log.u_bbr.bw_inuse = diag->wheel_tick; 2434 log.u_bbr.rttProp = diag->wheel_cts; 2435 log.u_bbr.delRate = diag->maxticks; 2436 log.u_bbr.cur_del_rate = diag->p_curtick; 2437 log.u_bbr.cur_del_rate <<= 32; 2438 log.u_bbr.cur_del_rate |= diag->p_lasttick; 2439 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2440 &bbr->rc_inp->inp_socket->so_rcv, 2441 &bbr->rc_inp->inp_socket->so_snd, 2442 BBR_LOG_HPTSDIAG, 0, 2443 0, &log, false, &bbr->rc_tv); 2444 } 2445 } 2446 2447 static void 2448 bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, 2449 uint32_t thresh, uint32_t to) 2450 { 2451 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2452 union tcp_log_stackspecific log; 2453 2454 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2455 log.u_bbr.flex1 = bbr->rc_tp->t_rttvar; 2456 log.u_bbr.flex2 = time_since_sent; 2457 log.u_bbr.flex3 = srtt; 2458 log.u_bbr.flex4 = thresh; 2459 log.u_bbr.flex5 = to; 2460 log.u_bbr.flex6 = bbr->rc_tp->t_srtt; 2461 log.u_bbr.flex8 = mode; 2462 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2463 &bbr->rc_inp->inp_socket->so_rcv, 2464 &bbr->rc_inp->inp_socket->so_snd, 2465 BBR_LOG_TIMERPREP, 0, 2466 0, &log, false, &bbr->rc_tv); 2467 } 2468 } 2469 2470 static void 2471 bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, 2472 uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod) 2473 { 2474 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2475 union tcp_log_stackspecific log; 2476 2477 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2478 log.u_bbr.flex1 = usecs; 2479 log.u_bbr.flex2 = len; 2480 log.u_bbr.flex3 = (uint32_t)((bw >> 32) & 0x00000000ffffffff); 2481 log.u_bbr.flex4 = (uint32_t)(bw & 0x00000000ffffffff); 2482 if (override) 2483 log.u_bbr.flex5 = (1 << 2); 2484 else 2485 log.u_bbr.flex5 = 0; 2486 log.u_bbr.flex6 = override; 2487 log.u_bbr.flex7 = gain; 2488 log.u_bbr.flex8 = mod; 2489 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2490 &bbr->rc_inp->inp_socket->so_rcv, 2491 &bbr->rc_inp->inp_socket->so_snd, 2492 BBR_LOG_HPTSI_CALC, 0, 2493 len, &log, false, &bbr->rc_tv); 2494 } 2495 } 2496 2497 static void 2498 bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which) 2499 { 2500 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2501 union tcp_log_stackspecific log; 2502 2503 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2504 2505 log.u_bbr.flex1 = bbr->bbr_timer_src; 2506 log.u_bbr.flex2 = to; 2507 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2508 log.u_bbr.flex4 = slot; 2509 log.u_bbr.flex5 = bbr->rc_inp->inp_hptsslot; 2510 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2511 log.u_bbr.pkts_out = bbr->rc_inp->inp_flags2; 2512 log.u_bbr.flex8 = which; 2513 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2514 &bbr->rc_inp->inp_socket->so_rcv, 2515 &bbr->rc_inp->inp_socket->so_snd, 2516 BBR_LOG_TIMERSTAR, 0, 2517 0, &log, false, &bbr->rc_tv); 2518 } 2519 } 2520 2521 static void 2522 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) 2523 { 2524 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2525 union tcp_log_stackspecific log; 2526 2527 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2528 log.u_bbr.flex1 = thresh; 2529 log.u_bbr.flex2 = lro; 2530 log.u_bbr.flex3 = bbr->r_ctl.rc_reorder_ts; 2531 log.u_bbr.flex4 = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]; 2532 log.u_bbr.flex5 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2533 log.u_bbr.flex6 = srtt; 2534 log.u_bbr.flex7 = bbr->r_ctl.rc_reorder_shift; 2535 log.u_bbr.flex8 = frm; 2536 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2537 &bbr->rc_inp->inp_socket->so_rcv, 2538 &bbr->rc_inp->inp_socket->so_snd, 2539 BBR_LOG_THRESH_CALC, 0, 2540 0, &log, false, &bbr->rc_tv); 2541 } 2542 } 2543 2544 static void 2545 bbr_log_to_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts, uint8_t hpts_removed) 2546 { 2547 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2548 union tcp_log_stackspecific log; 2549 2550 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2551 log.u_bbr.flex1 = line; 2552 log.u_bbr.flex2 = bbr->bbr_timer_src; 2553 log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; 2554 log.u_bbr.flex4 = bbr->rc_in_persist; 2555 log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; 2556 log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 2557 log.u_bbr.flex8 = hpts_removed; 2558 log.u_bbr.pkts_out = bbr->rc_pacer_started; 2559 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2560 &bbr->rc_inp->inp_socket->so_rcv, 2561 &bbr->rc_inp->inp_socket->so_snd, 2562 BBR_LOG_TIMERCANC, 0, 2563 0, &log, false, &bbr->rc_tv); 2564 } 2565 } 2566 2567 static void 2568 bbr_log_tstmp_validation(struct tcp_bbr *bbr, uint64_t peer_delta, uint64_t delta) 2569 { 2570 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2571 union tcp_log_stackspecific log; 2572 2573 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2574 log.u_bbr.flex1 = bbr->r_ctl.bbr_peer_tsratio; 2575 log.u_bbr.flex2 = (peer_delta >> 32); 2576 log.u_bbr.flex3 = (peer_delta & 0x00000000ffffffff); 2577 log.u_bbr.flex4 = (delta >> 32); 2578 log.u_bbr.flex5 = (delta & 0x00000000ffffffff); 2579 log.u_bbr.flex7 = bbr->rc_ts_clock_set; 2580 log.u_bbr.flex8 = bbr->rc_ts_cant_be_used; 2581 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2582 &bbr->rc_inp->inp_socket->so_rcv, 2583 &bbr->rc_inp->inp_socket->so_snd, 2584 BBR_LOG_TSTMP_VAL, 0, 2585 0, &log, false, &bbr->rc_tv); 2586 } 2587 } 2588 2589 static void 2590 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) 2591 { 2592 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2593 union tcp_log_stackspecific log; 2594 2595 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2596 log.u_bbr.flex1 = tsosz; 2597 log.u_bbr.flex2 = tls; 2598 log.u_bbr.flex3 = tcp_min_hptsi_time; 2599 log.u_bbr.flex4 = bbr->r_ctl.bbr_hptsi_bytes_min; 2600 log.u_bbr.flex5 = old_val; 2601 log.u_bbr.flex6 = maxseg; 2602 log.u_bbr.flex7 = bbr->rc_no_pacing; 2603 log.u_bbr.flex7 <<= 1; 2604 log.u_bbr.flex7 |= bbr->rc_past_init_win; 2605 if (hdwr) 2606 log.u_bbr.flex8 = 0x80 | bbr->rc_use_google; 2607 else 2608 log.u_bbr.flex8 = bbr->rc_use_google; 2609 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2610 &bbr->rc_inp->inp_socket->so_rcv, 2611 &bbr->rc_inp->inp_socket->so_snd, 2612 BBR_LOG_BBRTSO, 0, 2613 0, &log, false, &bbr->rc_tv); 2614 } 2615 } 2616 2617 static void 2618 bbr_log_type_rsmclear(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, 2619 uint32_t flags, uint32_t line) 2620 { 2621 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2622 union tcp_log_stackspecific log; 2623 2624 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2625 log.u_bbr.flex1 = line; 2626 log.u_bbr.flex2 = rsm->r_start; 2627 log.u_bbr.flex3 = rsm->r_end; 2628 log.u_bbr.flex4 = rsm->r_delivered; 2629 log.u_bbr.flex5 = rsm->r_rtr_cnt; 2630 log.u_bbr.flex6 = rsm->r_dupack; 2631 log.u_bbr.flex7 = rsm->r_tim_lastsent[0]; 2632 log.u_bbr.flex8 = rsm->r_flags; 2633 /* Hijack the pkts_out fids */ 2634 log.u_bbr.applimited = flags; 2635 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2636 &bbr->rc_inp->inp_socket->so_rcv, 2637 &bbr->rc_inp->inp_socket->so_snd, 2638 BBR_RSM_CLEARED, 0, 2639 0, &log, false, &bbr->rc_tv); 2640 } 2641 } 2642 2643 static void 2644 bbr_log_type_bbrupd(struct tcp_bbr *bbr, uint8_t flex8, uint32_t cts, 2645 uint32_t flex3, uint32_t flex2, uint32_t flex5, 2646 uint32_t flex6, uint32_t pkts_out, int flex7, 2647 uint32_t flex4, uint32_t flex1) 2648 { 2649 2650 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2651 union tcp_log_stackspecific log; 2652 2653 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2654 log.u_bbr.flex1 = flex1; 2655 log.u_bbr.flex2 = flex2; 2656 log.u_bbr.flex3 = flex3; 2657 log.u_bbr.flex4 = flex4; 2658 log.u_bbr.flex5 = flex5; 2659 log.u_bbr.flex6 = flex6; 2660 log.u_bbr.flex7 = flex7; 2661 /* Hijack the pkts_out fids */ 2662 log.u_bbr.pkts_out = pkts_out; 2663 log.u_bbr.flex8 = flex8; 2664 if (bbr->rc_ack_was_delayed) 2665 log.u_bbr.epoch = bbr->r_ctl.rc_ack_hdwr_delay; 2666 else 2667 log.u_bbr.epoch = 0; 2668 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2669 &bbr->rc_inp->inp_socket->so_rcv, 2670 &bbr->rc_inp->inp_socket->so_snd, 2671 BBR_LOG_BBRUPD, 0, 2672 flex2, &log, false, &bbr->rc_tv); 2673 } 2674 } 2675 2676 static void 2677 bbr_log_type_ltbw(struct tcp_bbr *bbr, uint32_t cts, int32_t reason, 2678 uint32_t newbw, uint32_t obw, uint32_t diff, 2679 uint32_t tim) 2680 { 2681 if (/*bbr_verbose_logging && */(bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2682 union tcp_log_stackspecific log; 2683 2684 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2685 log.u_bbr.flex1 = reason; 2686 log.u_bbr.flex2 = newbw; 2687 log.u_bbr.flex3 = obw; 2688 log.u_bbr.flex4 = diff; 2689 log.u_bbr.flex5 = bbr->r_ctl.rc_lt_lost; 2690 log.u_bbr.flex6 = bbr->r_ctl.rc_lt_del; 2691 log.u_bbr.flex7 = bbr->rc_lt_is_sampling; 2692 log.u_bbr.pkts_out = tim; 2693 log.u_bbr.bw_inuse = bbr->r_ctl.rc_lt_bw; 2694 if (bbr->rc_lt_use_bw == 0) 2695 log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; 2696 else 2697 log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; 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_BWSAMP, 0, 2702 0, &log, false, &bbr->rc_tv); 2703 } 2704 } 2705 2706 static inline void 2707 bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line) 2708 { 2709 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2710 union tcp_log_stackspecific log; 2711 2712 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2713 log.u_bbr.flex1 = line; 2714 log.u_bbr.flex2 = tick; 2715 log.u_bbr.flex3 = tp->t_maxunacktime; 2716 log.u_bbr.flex4 = tp->t_acktime; 2717 log.u_bbr.flex8 = event; 2718 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2719 &bbr->rc_inp->inp_socket->so_rcv, 2720 &bbr->rc_inp->inp_socket->so_snd, 2721 BBR_LOG_PROGRESS, 0, 2722 0, &log, false, &bbr->rc_tv); 2723 } 2724 } 2725 2726 static void 2727 bbr_type_log_hdwr_pacing(struct tcp_bbr *bbr, const struct ifnet *ifp, 2728 uint64_t rate, uint64_t hw_rate, int line, uint32_t cts, 2729 int error) 2730 { 2731 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2732 union tcp_log_stackspecific log; 2733 2734 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2735 log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff); 2736 log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff); 2737 log.u_bbr.flex3 = (((uint64_t)ifp >> 32) & 0x00000000ffffffff); 2738 log.u_bbr.flex4 = ((uint64_t)ifp & 0x00000000ffffffff); 2739 log.u_bbr.bw_inuse = rate; 2740 log.u_bbr.flex5 = line; 2741 log.u_bbr.flex6 = error; 2742 log.u_bbr.flex8 = bbr->skip_gain; 2743 log.u_bbr.flex8 <<= 1; 2744 log.u_bbr.flex8 |= bbr->gain_is_limited; 2745 log.u_bbr.flex8 <<= 1; 2746 log.u_bbr.flex8 |= bbr->bbr_hdrw_pacing; 2747 log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; 2748 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2749 &bbr->rc_inp->inp_socket->so_rcv, 2750 &bbr->rc_inp->inp_socket->so_snd, 2751 BBR_LOG_HDWR_PACE, 0, 2752 0, &log, false, &bbr->rc_tv); 2753 } 2754 } 2755 2756 static void 2757 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) 2758 { 2759 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2760 union tcp_log_stackspecific log; 2761 2762 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2763 log.u_bbr.flex1 = slot; 2764 log.u_bbr.flex2 = del_by; 2765 log.u_bbr.flex3 = prev_delay; 2766 log.u_bbr.flex4 = line; 2767 log.u_bbr.flex5 = bbr->r_ctl.rc_last_delay_val; 2768 log.u_bbr.flex6 = bbr->r_ctl.rc_hptsi_agg_delay; 2769 log.u_bbr.flex7 = (0x0000ffff & bbr->r_ctl.rc_hpts_flags); 2770 log.u_bbr.flex8 = bbr->rc_in_persist; 2771 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2772 &bbr->rc_inp->inp_socket->so_rcv, 2773 &bbr->rc_inp->inp_socket->so_snd, 2774 BBR_LOG_BBRSND, 0, 2775 len, &log, false, &bbr->rc_tv); 2776 } 2777 } 2778 2779 static void 2780 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) 2781 { 2782 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2783 union tcp_log_stackspecific log; 2784 2785 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2786 log.u_bbr.flex1 = bbr->r_ctl.rc_delivered; 2787 log.u_bbr.flex2 = 0; 2788 log.u_bbr.flex3 = bbr->r_ctl.rc_lowest_rtt; 2789 log.u_bbr.flex4 = end; 2790 log.u_bbr.flex5 = seq; 2791 log.u_bbr.flex6 = t; 2792 log.u_bbr.flex7 = match; 2793 log.u_bbr.flex8 = flags; 2794 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2795 &bbr->rc_inp->inp_socket->so_rcv, 2796 &bbr->rc_inp->inp_socket->so_snd, 2797 BBR_LOG_BBRRTT, 0, 2798 0, &log, false, &bbr->rc_tv); 2799 } 2800 } 2801 2802 static void 2803 bbr_log_exit_gain(struct tcp_bbr *bbr, uint32_t cts, int32_t entry_method) 2804 { 2805 if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { 2806 union tcp_log_stackspecific log; 2807 2808 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 2809 log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; 2810 log.u_bbr.flex2 = (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 2811 log.u_bbr.flex3 = bbr->r_ctl.gain_epoch; 2812 log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; 2813 log.u_bbr.flex5 = bbr->r_ctl.rc_pace_min_segs; 2814 log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_state_atflight; 2815 log.u_bbr.flex7 = 0; 2816 log.u_bbr.flex8 = entry_method; 2817 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2818 &bbr->rc_inp->inp_socket->so_rcv, 2819 &bbr->rc_inp->inp_socket->so_snd, 2820 BBR_LOG_EXIT_GAIN, 0, 2821 0, &log, false, &bbr->rc_tv); 2822 } 2823 } 2824 2825 static void 2826 bbr_log_settings_change(struct tcp_bbr *bbr, int settings_desired) 2827 { 2828 if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { 2829 union tcp_log_stackspecific log; 2830 2831 bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); 2832 /* R-HU */ 2833 log.u_bbr.flex1 = 0; 2834 log.u_bbr.flex2 = 0; 2835 log.u_bbr.flex3 = 0; 2836 log.u_bbr.flex4 = 0; 2837 log.u_bbr.flex7 = 0; 2838 log.u_bbr.flex8 = settings_desired; 2839 2840 TCP_LOG_EVENTP(bbr->rc_tp, NULL, 2841 &bbr->rc_inp->inp_socket->so_rcv, 2842 &bbr->rc_inp->inp_socket->so_snd, 2843 BBR_LOG_SETTINGS_CHG, 0, 2844 0, &log, false, &bbr->rc_tv); 2845 } 2846 } 2847 2848 /* 2849 * Returns the bw from the our filter. 2850 */ 2851 static inline uint64_t 2852 bbr_get_full_bw(struct tcp_bbr *bbr) 2853 { 2854 uint64_t bw; 2855 2856 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 2857 2858 return (bw); 2859 } 2860 2861 static inline void 2862 bbr_set_pktepoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2863 { 2864 uint64_t calclr; 2865 uint32_t lost, del; 2866 2867 if (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_pktepoch) 2868 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lost_at_pktepoch; 2869 else 2870 lost = 0; 2871 del = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_pkt_epoch_del; 2872 if (lost == 0) { 2873 calclr = 0; 2874 } else if (del) { 2875 calclr = lost; 2876 calclr *= (uint64_t)1000; 2877 calclr /= (uint64_t)del; 2878 } else { 2879 /* Nothing delivered? 100.0% loss */ 2880 calclr = 1000; 2881 } 2882 bbr->r_ctl.rc_pkt_epoch_loss_rate = (uint32_t)calclr; 2883 if (IN_RECOVERY(bbr->rc_tp->t_flags)) 2884 bbr->r_ctl.recovery_lr += (uint32_t)calclr; 2885 bbr->r_ctl.rc_pkt_epoch++; 2886 if (bbr->rc_no_pacing && 2887 (bbr->r_ctl.rc_pkt_epoch >= bbr->no_pacing_until)) { 2888 bbr->rc_no_pacing = 0; 2889 tcp_bbr_tso_size_check(bbr, cts); 2890 } 2891 bbr->r_ctl.rc_pkt_epoch_rtt = bbr_calc_time(cts, bbr->r_ctl.rc_pkt_epoch_time); 2892 bbr->r_ctl.rc_pkt_epoch_time = cts; 2893 /* What was our loss rate */ 2894 bbr_log_pkt_epoch(bbr, cts, line, lost, del); 2895 bbr->r_ctl.rc_pkt_epoch_del = bbr->r_ctl.rc_delivered; 2896 bbr->r_ctl.rc_lost_at_pktepoch = bbr->r_ctl.rc_lost; 2897 } 2898 2899 static inline void 2900 bbr_set_epoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 2901 { 2902 uint32_t epoch_time; 2903 2904 /* Tick the RTT clock */ 2905 bbr->r_ctl.rc_rtt_epoch++; 2906 epoch_time = cts - bbr->r_ctl.rc_rcv_epoch_start; 2907 bbr_log_time_epoch(bbr, cts, line, epoch_time); 2908 bbr->r_ctl.rc_rcv_epoch_start = cts; 2909 } 2910 2911 static inline void 2912 bbr_isit_a_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, int32_t line, int32_t cum_acked) 2913 { 2914 if (SEQ_GEQ(rsm->r_delivered, bbr->r_ctl.rc_pkt_epoch_del)) { 2915 bbr->rc_is_pkt_epoch_now = 1; 2916 } 2917 } 2918 2919 /* 2920 * Returns the bw from either the b/w filter 2921 * or from the lt_bw (if the connection is being 2922 * policed). 2923 */ 2924 static inline uint64_t 2925 __bbr_get_bw(struct tcp_bbr *bbr) 2926 { 2927 uint64_t bw, min_bw; 2928 uint64_t rtt; 2929 int gm_measure_cnt = 1; 2930 2931 /* 2932 * For startup we make, like google, a 2933 * minimum b/w. This is generated from the 2934 * IW and the rttProp. We do fall back to srtt 2935 * if for some reason (initial handshake) we don't 2936 * have a rttProp. We, in the worst case, fall back 2937 * to the configured min_bw (rc_initial_hptsi_bw). 2938 */ 2939 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 2940 /* Attempt first to use rttProp */ 2941 rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); 2942 if (rtt && (rtt < 0xffffffff)) { 2943 measure: 2944 min_bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * 2945 ((uint64_t)1000000); 2946 min_bw /= rtt; 2947 if (min_bw < bbr->r_ctl.rc_initial_hptsi_bw) { 2948 min_bw = bbr->r_ctl.rc_initial_hptsi_bw; 2949 } 2950 2951 } else if (bbr->rc_tp->t_srtt != 0) { 2952 /* No rttProp, use srtt? */ 2953 rtt = bbr_get_rtt(bbr, BBR_SRTT); 2954 goto measure; 2955 } else { 2956 min_bw = bbr->r_ctl.rc_initial_hptsi_bw; 2957 } 2958 } else 2959 min_bw = 0; 2960 2961 if ((bbr->rc_past_init_win == 0) && 2962 (bbr->r_ctl.rc_delivered > bbr_initial_cwnd(bbr, bbr->rc_tp))) 2963 bbr->rc_past_init_win = 1; 2964 if ((bbr->rc_use_google) && (bbr->r_ctl.r_measurement_count >= 1)) 2965 gm_measure_cnt = 0; 2966 if (gm_measure_cnt && 2967 ((bbr->r_ctl.r_measurement_count < bbr_min_measurements_req) || 2968 (bbr->rc_past_init_win == 0))) { 2969 /* For google we use our guess rate until we get 1 measurement */ 2970 2971 use_initial_window: 2972 rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); 2973 if (rtt && (rtt < 0xffffffff)) { 2974 /* 2975 * We have an RTT measurment. Use that in 2976 * combination with our initial window to calculate 2977 * a b/w. 2978 */ 2979 bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * 2980 ((uint64_t)1000000); 2981 bw /= rtt; 2982 if (bw < bbr->r_ctl.rc_initial_hptsi_bw) { 2983 bw = bbr->r_ctl.rc_initial_hptsi_bw; 2984 } 2985 } else { 2986 /* Drop back to the 40 and punt to a default */ 2987 bw = bbr->r_ctl.rc_initial_hptsi_bw; 2988 } 2989 if (bw < 1) 2990 /* Probably should panic */ 2991 bw = 1; 2992 if (bw > min_bw) 2993 return (bw); 2994 else 2995 return (min_bw); 2996 } 2997 if (bbr->rc_lt_use_bw) 2998 bw = bbr->r_ctl.rc_lt_bw; 2999 else if (bbr->r_recovery_bw && (bbr->rc_use_google == 0)) 3000 bw = bbr->r_ctl.red_bw; 3001 else 3002 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3003 if (bbr->rc_tp->t_peakrate_thr && (bbr->rc_use_google == 0)) { 3004 /* 3005 * Enforce user set rate limit, keep in mind that 3006 * t_peakrate_thr is in B/s already 3007 */ 3008 bw = uqmin((uint64_t)bbr->rc_tp->t_peakrate_thr, bw); 3009 } 3010 if (bw == 0) { 3011 /* We should not be at 0, go to the initial window then */ 3012 goto use_initial_window; 3013 } 3014 if (bw < 1) 3015 /* Probably should panic */ 3016 bw = 1; 3017 if (bw < min_bw) 3018 bw = min_bw; 3019 return (bw); 3020 } 3021 3022 static inline uint64_t 3023 bbr_get_bw(struct tcp_bbr *bbr) 3024 { 3025 uint64_t bw; 3026 3027 bw = __bbr_get_bw(bbr); 3028 return (bw); 3029 } 3030 3031 static inline void 3032 bbr_reset_lt_bw_interval(struct tcp_bbr *bbr, uint32_t cts) 3033 { 3034 bbr->r_ctl.rc_lt_epoch = bbr->r_ctl.rc_pkt_epoch; 3035 bbr->r_ctl.rc_lt_time = bbr->r_ctl.rc_del_time; 3036 bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; 3037 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 3038 } 3039 3040 static inline void 3041 bbr_reset_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts) 3042 { 3043 bbr->rc_lt_is_sampling = 0; 3044 bbr->rc_lt_use_bw = 0; 3045 bbr->r_ctl.rc_lt_bw = 0; 3046 bbr_reset_lt_bw_interval(bbr, cts); 3047 } 3048 3049 static inline void 3050 bbr_lt_bw_samp_done(struct tcp_bbr *bbr, uint64_t bw, uint32_t cts, uint32_t timin) 3051 { 3052 uint64_t diff; 3053 3054 /* Do we have a previous sample? */ 3055 if (bbr->r_ctl.rc_lt_bw) { 3056 /* Get the diff in bytes per second */ 3057 if (bbr->r_ctl.rc_lt_bw > bw) 3058 diff = bbr->r_ctl.rc_lt_bw - bw; 3059 else 3060 diff = bw - bbr->r_ctl.rc_lt_bw; 3061 if ((diff <= bbr_lt_bw_diff) || 3062 (diff <= (bbr->r_ctl.rc_lt_bw / bbr_lt_bw_ratio))) { 3063 /* Consider us policed */ 3064 uint32_t saved_bw; 3065 3066 saved_bw = (uint32_t)bbr->r_ctl.rc_lt_bw; 3067 bbr->r_ctl.rc_lt_bw = (bw + bbr->r_ctl.rc_lt_bw) / 2; /* average of two */ 3068 bbr->rc_lt_use_bw = 1; 3069 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 3070 /* 3071 * Use pkt based epoch for measuring length of 3072 * policer up 3073 */ 3074 bbr->r_ctl.rc_lt_epoch_use = bbr->r_ctl.rc_pkt_epoch; 3075 /* 3076 * reason 4 is we need to start consider being 3077 * policed 3078 */ 3079 bbr_log_type_ltbw(bbr, cts, 4, (uint32_t)bw, saved_bw, (uint32_t)diff, timin); 3080 return; 3081 } 3082 } 3083 bbr->r_ctl.rc_lt_bw = bw; 3084 bbr_reset_lt_bw_interval(bbr, cts); 3085 bbr_log_type_ltbw(bbr, cts, 5, 0, (uint32_t)bw, 0, timin); 3086 } 3087 3088 static void 3089 bbr_randomize_extra_state_time(struct tcp_bbr *bbr) 3090 { 3091 uint32_t ran, deduct; 3092 3093 ran = arc4random_uniform(bbr_rand_ot); 3094 if (ran) { 3095 deduct = bbr->r_ctl.rc_level_state_extra / ran; 3096 bbr->r_ctl.rc_level_state_extra -= deduct; 3097 } 3098 } 3099 /* 3100 * Return randomly the starting state 3101 * to use in probebw. 3102 */ 3103 static uint8_t 3104 bbr_pick_probebw_substate(struct tcp_bbr *bbr, uint32_t cts) 3105 { 3106 uint32_t ran; 3107 uint8_t ret_val; 3108 3109 /* Initialize the offset to 0 */ 3110 bbr->r_ctl.rc_exta_time_gd = 0; 3111 bbr->rc_hit_state_1 = 0; 3112 bbr->r_ctl.rc_level_state_extra = 0; 3113 ran = arc4random_uniform((BBR_SUBSTATE_COUNT-1)); 3114 /* 3115 * The math works funny here :) the return value is used to set the 3116 * substate and then the state change is called which increments by 3117 * one. So if we return 1 (DRAIN) we will increment to 2 (LEVEL1) when 3118 * we fully enter the state. Note that the (8 - 1 - ran) assures that 3119 * we return 1 - 7, so we dont return 0 and end up starting in 3120 * state 1 (DRAIN). 3121 */ 3122 ret_val = BBR_SUBSTATE_COUNT - 1 - ran; 3123 /* Set an epoch */ 3124 if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) 3125 bbr_set_epoch(bbr, cts, __LINE__); 3126 3127 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 3128 return (ret_val); 3129 } 3130 3131 static void 3132 bbr_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts, int32_t loss_detected) 3133 { 3134 uint32_t diff, d_time; 3135 uint64_t del_time, bw, lost, delivered; 3136 3137 if (bbr->r_use_policer == 0) 3138 return; 3139 if (bbr->rc_lt_use_bw) { 3140 /* We are using lt bw do we stop yet? */ 3141 diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; 3142 if (diff > bbr_lt_bw_max_rtts) { 3143 /* Reset it all */ 3144 reset_all: 3145 bbr_reset_lt_bw_sampling(bbr, cts); 3146 if (bbr->rc_filled_pipe) { 3147 bbr_set_epoch(bbr, cts, __LINE__); 3148 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 3149 bbr_substate_change(bbr, cts, __LINE__, 0); 3150 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 3151 bbr_log_type_statechange(bbr, cts, __LINE__); 3152 } else { 3153 /* 3154 * This should not happen really 3155 * unless we remove the startup/drain 3156 * restrictions above. 3157 */ 3158 bbr->rc_bbr_state = BBR_STATE_STARTUP; 3159 bbr_set_epoch(bbr, cts, __LINE__); 3160 bbr->r_ctl.rc_bbr_state_time = cts; 3161 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 3162 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 3163 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 3164 bbr_set_state_target(bbr, __LINE__); 3165 bbr_log_type_statechange(bbr, cts, __LINE__); 3166 } 3167 /* reason 0 is to stop using lt-bw */ 3168 bbr_log_type_ltbw(bbr, cts, 0, 0, 0, 0, 0); 3169 return; 3170 } 3171 if (bbr_lt_intvl_fp == 0) { 3172 /* Not doing false-postive detection */ 3173 return; 3174 } 3175 /* False positive detection */ 3176 if (diff == bbr_lt_intvl_fp) { 3177 /* At bbr_lt_intvl_fp we record the lost */ 3178 bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; 3179 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 3180 } else if (diff > (bbr_lt_intvl_min_rtts + bbr_lt_intvl_fp)) { 3181 /* Now is our loss rate still high? */ 3182 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; 3183 delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; 3184 if ((delivered == 0) || 3185 (((lost * 1000)/delivered) < bbr_lt_fd_thresh)) { 3186 /* No still below our threshold */ 3187 bbr_log_type_ltbw(bbr, cts, 7, lost, delivered, 0, 0); 3188 } else { 3189 /* Yikes its still high, it must be a false positive */ 3190 bbr_log_type_ltbw(bbr, cts, 8, lost, delivered, 0, 0); 3191 goto reset_all; 3192 } 3193 } 3194 return; 3195 } 3196 /* 3197 * Wait for the first loss before sampling, to let the policer 3198 * exhaust its tokens and estimate the steady-state rate allowed by 3199 * the policer. Starting samples earlier includes bursts that 3200 * over-estimate the bw. 3201 */ 3202 if (bbr->rc_lt_is_sampling == 0) { 3203 /* reason 1 is to begin doing the sampling */ 3204 if (loss_detected == 0) 3205 return; 3206 bbr_reset_lt_bw_interval(bbr, cts); 3207 bbr->rc_lt_is_sampling = 1; 3208 bbr_log_type_ltbw(bbr, cts, 1, 0, 0, 0, 0); 3209 return; 3210 } 3211 /* Now how long were we delivering long term last> */ 3212 if (TSTMP_GEQ(bbr->r_ctl.rc_del_time, bbr->r_ctl.rc_lt_time)) 3213 d_time = bbr->r_ctl.rc_del_time - bbr->r_ctl.rc_lt_time; 3214 else 3215 d_time = 0; 3216 3217 /* To avoid underestimates, reset sampling if we run out of data. */ 3218 if (bbr->r_ctl.r_app_limited_until) { 3219 /* Can not measure in app-limited state */ 3220 bbr_reset_lt_bw_sampling(bbr, cts); 3221 /* reason 2 is to reset sampling due to app limits */ 3222 bbr_log_type_ltbw(bbr, cts, 2, 0, 0, 0, d_time); 3223 return; 3224 } 3225 diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; 3226 if (diff < bbr_lt_intvl_min_rtts) { 3227 /* 3228 * need more samples (we don't 3229 * start on a round like linux so 3230 * we need 1 more). 3231 */ 3232 /* 6 is not_enough time or no-loss */ 3233 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3234 return; 3235 } 3236 if (diff > (4 * bbr_lt_intvl_min_rtts)) { 3237 /* 3238 * For now if we wait too long, reset all sampling. We need 3239 * to do some research here, its possible that we should 3240 * base this on how much loss as occurred.. something like 3241 * if its under 10% (or some thresh) reset all otherwise 3242 * don't. Thats for phase II I guess. 3243 */ 3244 bbr_reset_lt_bw_sampling(bbr, cts); 3245 /* reason 3 is to reset sampling due too long of sampling */ 3246 bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); 3247 return; 3248 } 3249 /* 3250 * End sampling interval when a packet is lost, so we estimate the 3251 * policer tokens were exhausted. Stopping the sampling before the 3252 * tokens are exhausted under-estimates the policed rate. 3253 */ 3254 if (loss_detected == 0) { 3255 /* 6 is not_enough time or no-loss */ 3256 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3257 return; 3258 } 3259 /* Calculate packets lost and delivered in sampling interval. */ 3260 lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; 3261 delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; 3262 if ((delivered == 0) || 3263 (((lost * 1000)/delivered) < bbr_lt_loss_thresh)) { 3264 bbr_log_type_ltbw(bbr, cts, 6, lost, delivered, 0, d_time); 3265 return; 3266 } 3267 if (d_time < 1000) { 3268 /* Not enough time. wait */ 3269 /* 6 is not_enough time or no-loss */ 3270 bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); 3271 return; 3272 } 3273 if (d_time >= (0xffffffff / USECS_IN_MSEC)) { 3274 /* Too long */ 3275 bbr_reset_lt_bw_sampling(bbr, cts); 3276 /* reason 3 is to reset sampling due too long of sampling */ 3277 bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); 3278 return; 3279 } 3280 del_time = d_time; 3281 bw = delivered; 3282 bw *= (uint64_t)USECS_IN_SECOND; 3283 bw /= del_time; 3284 bbr_lt_bw_samp_done(bbr, bw, cts, d_time); 3285 } 3286 3287 /* 3288 * Allocate a sendmap from our zone. 3289 */ 3290 static struct bbr_sendmap * 3291 bbr_alloc(struct tcp_bbr *bbr) 3292 { 3293 struct bbr_sendmap *rsm; 3294 3295 BBR_STAT_INC(bbr_to_alloc); 3296 rsm = uma_zalloc(bbr_zone, (M_NOWAIT | M_ZERO)); 3297 if (rsm) { 3298 bbr->r_ctl.rc_num_maps_alloced++; 3299 return (rsm); 3300 } 3301 if (bbr->r_ctl.rc_free_cnt) { 3302 BBR_STAT_INC(bbr_to_alloc_emerg); 3303 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 3304 TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); 3305 bbr->r_ctl.rc_free_cnt--; 3306 return (rsm); 3307 } 3308 BBR_STAT_INC(bbr_to_alloc_failed); 3309 return (NULL); 3310 } 3311 3312 static struct bbr_sendmap * 3313 bbr_alloc_full_limit(struct tcp_bbr *bbr) 3314 { 3315 if ((V_tcp_map_entries_limit > 0) && 3316 (bbr->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) { 3317 BBR_STAT_INC(bbr_alloc_limited); 3318 if (!bbr->alloc_limit_reported) { 3319 bbr->alloc_limit_reported = 1; 3320 BBR_STAT_INC(bbr_alloc_limited_conns); 3321 } 3322 return (NULL); 3323 } 3324 return (bbr_alloc(bbr)); 3325 } 3326 3327 /* wrapper to allocate a sendmap entry, subject to a specific limit */ 3328 static struct bbr_sendmap * 3329 bbr_alloc_limit(struct tcp_bbr *bbr, uint8_t limit_type) 3330 { 3331 struct bbr_sendmap *rsm; 3332 3333 if (limit_type) { 3334 /* currently there is only one limit type */ 3335 if (V_tcp_map_split_limit > 0 && 3336 bbr->r_ctl.rc_num_split_allocs >= V_tcp_map_split_limit) { 3337 BBR_STAT_INC(bbr_split_limited); 3338 if (!bbr->alloc_limit_reported) { 3339 bbr->alloc_limit_reported = 1; 3340 BBR_STAT_INC(bbr_alloc_limited_conns); 3341 } 3342 return (NULL); 3343 } 3344 } 3345 3346 /* allocate and mark in the limit type, if set */ 3347 rsm = bbr_alloc(bbr); 3348 if (rsm != NULL && limit_type) { 3349 rsm->r_limit_type = limit_type; 3350 bbr->r_ctl.rc_num_split_allocs++; 3351 } 3352 return (rsm); 3353 } 3354 3355 static void 3356 bbr_free(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 3357 { 3358 if (rsm->r_limit_type) { 3359 /* currently there is only one limit type */ 3360 bbr->r_ctl.rc_num_split_allocs--; 3361 } 3362 if (rsm->r_is_smallmap) 3363 bbr->r_ctl.rc_num_small_maps_alloced--; 3364 if (bbr->r_ctl.rc_tlp_send == rsm) 3365 bbr->r_ctl.rc_tlp_send = NULL; 3366 if (bbr->r_ctl.rc_resend == rsm) { 3367 bbr->r_ctl.rc_resend = NULL; 3368 } 3369 if (bbr->r_ctl.rc_next == rsm) 3370 bbr->r_ctl.rc_next = NULL; 3371 if (bbr->r_ctl.rc_sacklast == rsm) 3372 bbr->r_ctl.rc_sacklast = NULL; 3373 if (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { 3374 memset(rsm, 0, sizeof(struct bbr_sendmap)); 3375 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); 3376 rsm->r_limit_type = 0; 3377 bbr->r_ctl.rc_free_cnt++; 3378 return; 3379 } 3380 bbr->r_ctl.rc_num_maps_alloced--; 3381 uma_zfree(bbr_zone, rsm); 3382 } 3383 3384 /* 3385 * Returns the BDP. 3386 */ 3387 static uint64_t 3388 bbr_get_bw_delay_prod(uint64_t rtt, uint64_t bw) { 3389 /* 3390 * Calculate the bytes in flight needed given the bw (in bytes per 3391 * second) and the specifyed rtt in useconds. We need to put out the 3392 * returned value per RTT to match that rate. Gain will normally 3393 * raise it up from there. 3394 * 3395 * This should not overflow as long as the bandwidth is below 1 3396 * TByte per second (bw < 10**12 = 2**40) and the rtt is smaller 3397 * than 1000 seconds (rtt < 10**3 * 10**6 = 10**9 = 2**30). 3398 */ 3399 uint64_t usec_per_sec; 3400 3401 usec_per_sec = USECS_IN_SECOND; 3402 return ((rtt * bw) / usec_per_sec); 3403 } 3404 3405 /* 3406 * Return the initial cwnd. 3407 */ 3408 static uint32_t 3409 bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp) 3410 { 3411 uint32_t i_cwnd; 3412 3413 if (bbr->rc_init_win) { 3414 i_cwnd = bbr->rc_init_win * tp->t_maxseg; 3415 } else if (V_tcp_initcwnd_segments) 3416 i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg), 3417 max(2 * tp->t_maxseg, 14600)); 3418 else if (V_tcp_do_rfc3390) 3419 i_cwnd = min(4 * tp->t_maxseg, 3420 max(2 * tp->t_maxseg, 4380)); 3421 else { 3422 /* Per RFC5681 Section 3.1 */ 3423 if (tp->t_maxseg > 2190) 3424 i_cwnd = 2 * tp->t_maxseg; 3425 else if (tp->t_maxseg > 1095) 3426 i_cwnd = 3 * tp->t_maxseg; 3427 else 3428 i_cwnd = 4 * tp->t_maxseg; 3429 } 3430 return (i_cwnd); 3431 } 3432 3433 /* 3434 * Given a specified gain, return the target 3435 * cwnd based on that gain. 3436 */ 3437 static uint32_t 3438 bbr_get_raw_target_cwnd(struct tcp_bbr *bbr, uint32_t gain, uint64_t bw) 3439 { 3440 uint64_t bdp, rtt; 3441 uint32_t cwnd; 3442 3443 if ((get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) || 3444 (bbr_get_full_bw(bbr) == 0)) { 3445 /* No measurements yet */ 3446 return (bbr_initial_cwnd(bbr, bbr->rc_tp)); 3447 } 3448 /* 3449 * Get bytes per RTT needed (rttProp is normally in 3450 * bbr_cwndtarget_rtt_touse) 3451 */ 3452 rtt = bbr_get_rtt(bbr, bbr_cwndtarget_rtt_touse); 3453 /* Get the bdp from the two values */ 3454 bdp = bbr_get_bw_delay_prod(rtt, bw); 3455 /* Now apply the gain */ 3456 cwnd = (uint32_t)(((bdp * ((uint64_t)gain)) + (uint64_t)(BBR_UNIT - 1)) / ((uint64_t)BBR_UNIT)); 3457 3458 return (cwnd); 3459 } 3460 3461 static uint32_t 3462 bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain) 3463 { 3464 uint32_t cwnd, mss; 3465 3466 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 3467 /* Get the base cwnd with gain rounded to a mss */ 3468 cwnd = roundup(bbr_get_raw_target_cwnd(bbr, bw, gain), mss); 3469 /* 3470 * Add in N (2 default since we do not have a 3471 * fq layer to trap packets in) quanta's per the I-D 3472 * section 4.2.3.2 quanta adjust. 3473 */ 3474 cwnd += (bbr_quanta * bbr->r_ctl.rc_pace_max_segs); 3475 if (bbr->rc_use_google) { 3476 if((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 3477 (bbr_state_val(bbr) == BBR_SUB_GAIN)) { 3478 /* 3479 * The linux implementation adds 3480 * an extra 2 x mss in gain cycle which 3481 * is documented no-where except in the code. 3482 * so we add more for Neal undocumented feature 3483 */ 3484 cwnd += 2 * mss; 3485 } 3486 if ((cwnd / mss) & 0x1) { 3487 /* Round up for odd num mss */ 3488 cwnd += mss; 3489 } 3490 } 3491 /* Are we below the min cwnd? */ 3492 if (cwnd < get_min_cwnd(bbr)) 3493 return (get_min_cwnd(bbr)); 3494 return (cwnd); 3495 } 3496 3497 static uint16_t 3498 bbr_gain_adjust(struct tcp_bbr *bbr, uint16_t gain) 3499 { 3500 if (gain < 1) 3501 gain = 1; 3502 return (gain); 3503 } 3504 3505 static uint32_t 3506 bbr_get_header_oh(struct tcp_bbr *bbr) 3507 { 3508 int seg_oh; 3509 3510 seg_oh = 0; 3511 if (bbr->r_ctl.rc_inc_tcp_oh) { 3512 /* Do we include TCP overhead? */ 3513 seg_oh = (bbr->rc_last_options + sizeof(struct tcphdr)); 3514 } 3515 if (bbr->r_ctl.rc_inc_ip_oh) { 3516 /* Do we include IP overhead? */ 3517 #ifdef INET6 3518 if (bbr->r_is_v6) 3519 seg_oh += sizeof(struct ip6_hdr); 3520 else 3521 #endif 3522 #ifdef INET 3523 seg_oh += sizeof(struct ip); 3524 #endif 3525 } 3526 if (bbr->r_ctl.rc_inc_enet_oh) { 3527 /* Do we include the ethernet overhead? */ 3528 seg_oh += sizeof(struct ether_header); 3529 } 3530 return(seg_oh); 3531 } 3532 3533 static uint32_t 3534 bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, uint32_t useconds_time, uint64_t bw) 3535 { 3536 uint64_t divor, res, tim; 3537 3538 if (useconds_time == 0) 3539 return (0); 3540 gain = bbr_gain_adjust(bbr, gain); 3541 divor = (uint64_t)USECS_IN_SECOND * (uint64_t)BBR_UNIT; 3542 tim = useconds_time; 3543 res = (tim * bw * gain) / divor; 3544 if (res == 0) 3545 res = 1; 3546 return ((uint32_t)res); 3547 } 3548 3549 /* 3550 * Given a gain and a length return the delay in useconds that 3551 * should be used to evenly space out packets 3552 * on the connection (based on the gain factor). 3553 */ 3554 static uint32_t 3555 bbr_get_pacing_delay(struct tcp_bbr *bbr, uint16_t gain, int32_t len, uint32_t cts, int nolog) 3556 { 3557 uint64_t bw, lentim, res; 3558 uint32_t usecs, srtt, over = 0; 3559 uint32_t seg_oh, num_segs, maxseg; 3560 3561 if (len == 0) 3562 return (0); 3563 3564 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 3565 num_segs = (len + maxseg - 1) / maxseg; 3566 if (bbr->rc_use_google == 0) { 3567 seg_oh = bbr_get_header_oh(bbr); 3568 len += (num_segs * seg_oh); 3569 } 3570 gain = bbr_gain_adjust(bbr, gain); 3571 bw = bbr_get_bw(bbr); 3572 if (bbr->rc_use_google) { 3573 uint64_t cbw; 3574 3575 /* 3576 * Reduce the b/w by the google discount 3577 * factor 10 = 1%. 3578 */ 3579 cbw = bw * (uint64_t)(1000 - bbr->r_ctl.bbr_google_discount); 3580 cbw /= (uint64_t)1000; 3581 /* We don't apply a discount if it results in 0 */ 3582 if (cbw > 0) 3583 bw = cbw; 3584 } 3585 lentim = ((uint64_t)len * 3586 (uint64_t)USECS_IN_SECOND * 3587 (uint64_t)BBR_UNIT); 3588 res = lentim / ((uint64_t)gain * bw); 3589 if (res == 0) 3590 res = 1; 3591 usecs = (uint32_t)res; 3592 srtt = bbr_get_rtt(bbr, BBR_SRTT); 3593 if (bbr_hptsi_max_mul && bbr_hptsi_max_div && 3594 (bbr->rc_use_google == 0) && 3595 (usecs > ((srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div))) { 3596 /* 3597 * We cannot let the delay be more than 1/2 the srtt time. 3598 * Otherwise we cannot pace out or send properly. 3599 */ 3600 over = usecs = (srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div; 3601 BBR_STAT_INC(bbr_hpts_min_time); 3602 } 3603 if (!nolog) 3604 bbr_log_pacing_delay_calc(bbr, gain, len, cts, usecs, bw, over, 1); 3605 return (usecs); 3606 } 3607 3608 static void 3609 bbr_ack_received(struct tcpcb *tp, struct tcp_bbr *bbr, struct tcphdr *th, uint32_t bytes_this_ack, 3610 uint32_t sack_changed, uint32_t prev_acked, int32_t line, uint32_t losses) 3611 { 3612 INP_WLOCK_ASSERT(tp->t_inpcb); 3613 uint64_t bw; 3614 uint32_t cwnd, target_cwnd, saved_bytes, maxseg; 3615 int32_t meth; 3616 3617 #ifdef STATS 3618 if ((tp->t_flags & TF_GPUTINPROG) && 3619 SEQ_GEQ(th->th_ack, tp->gput_ack)) { 3620 /* 3621 * Strech acks and compressed acks will cause this to 3622 * oscillate but we are doing it the same way as the main 3623 * stack so it will be compariable (though possibly not 3624 * ideal). 3625 */ 3626 int32_t cgput; 3627 int64_t gput, time_stamp; 3628 3629 gput = (int64_t) (th->th_ack - tp->gput_seq) * 8; 3630 time_stamp = max(1, ((bbr->r_ctl.rc_rcvtime - tp->gput_ts) / 1000)); 3631 cgput = gput / time_stamp; 3632 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT, 3633 cgput); 3634 if (tp->t_stats_gput_prev > 0) 3635 stats_voi_update_abs_s32(tp->t_stats, 3636 VOI_TCP_GPUT_ND, 3637 ((gput - tp->t_stats_gput_prev) * 100) / 3638 tp->t_stats_gput_prev); 3639 tp->t_flags &= ~TF_GPUTINPROG; 3640 tp->t_stats_gput_prev = cgput; 3641 } 3642 #endif 3643 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3644 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 3645 /* We don't change anything in probe-rtt */ 3646 return; 3647 } 3648 maxseg = tp->t_maxseg - bbr->rc_last_options; 3649 saved_bytes = bytes_this_ack; 3650 bytes_this_ack += sack_changed; 3651 if (bytes_this_ack > prev_acked) { 3652 bytes_this_ack -= prev_acked; 3653 /* 3654 * A byte ack'd gives us a full mss 3655 * to be like linux i.e. they count packets. 3656 */ 3657 if ((bytes_this_ack < maxseg) && bbr->rc_use_google) 3658 bytes_this_ack = maxseg; 3659 } else { 3660 /* Unlikely */ 3661 bytes_this_ack = 0; 3662 } 3663 cwnd = tp->snd_cwnd; 3664 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3665 if (bw) 3666 target_cwnd = bbr_get_target_cwnd(bbr, 3667 bw, 3668 (uint32_t)bbr->r_ctl.rc_bbr_cwnd_gain); 3669 else 3670 target_cwnd = bbr_initial_cwnd(bbr, bbr->rc_tp); 3671 if (IN_RECOVERY(tp->t_flags) && 3672 (bbr->bbr_prev_in_rec == 0)) { 3673 /* 3674 * We are entering recovery and 3675 * thus packet conservation. 3676 */ 3677 bbr->pkt_conservation = 1; 3678 bbr->r_ctl.rc_recovery_start = bbr->r_ctl.rc_rcvtime; 3679 cwnd = ctf_flight_size(tp, 3680 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 3681 bytes_this_ack; 3682 } 3683 if (IN_RECOVERY(tp->t_flags)) { 3684 uint32_t flight; 3685 3686 bbr->bbr_prev_in_rec = 1; 3687 if (cwnd > losses) { 3688 cwnd -= losses; 3689 if (cwnd < maxseg) 3690 cwnd = maxseg; 3691 } else 3692 cwnd = maxseg; 3693 flight = ctf_flight_size(tp, 3694 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3695 bbr_log_type_cwndupd(bbr, flight, 0, 3696 losses, 10, 0, 0, line); 3697 if (bbr->pkt_conservation) { 3698 uint32_t time_in; 3699 3700 if (TSTMP_GEQ(bbr->r_ctl.rc_rcvtime, bbr->r_ctl.rc_recovery_start)) 3701 time_in = bbr->r_ctl.rc_rcvtime - bbr->r_ctl.rc_recovery_start; 3702 else 3703 time_in = 0; 3704 3705 if (time_in >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 3706 /* Clear packet conservation after an rttProp */ 3707 bbr->pkt_conservation = 0; 3708 } else { 3709 if ((flight + bytes_this_ack) > cwnd) 3710 cwnd = flight + bytes_this_ack; 3711 if (cwnd < get_min_cwnd(bbr)) 3712 cwnd = get_min_cwnd(bbr); 3713 tp->snd_cwnd = cwnd; 3714 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, 3715 prev_acked, 1, target_cwnd, th->th_ack, line); 3716 return; 3717 } 3718 } 3719 } else 3720 bbr->bbr_prev_in_rec = 0; 3721 if ((bbr->rc_use_google == 0) && bbr->r_ctl.restrict_growth) { 3722 bbr->r_ctl.restrict_growth--; 3723 if (bytes_this_ack > maxseg) 3724 bytes_this_ack = maxseg; 3725 } 3726 if (bbr->rc_filled_pipe) { 3727 /* 3728 * Here we have exited startup and filled the pipe. We will 3729 * thus allow the cwnd to shrink to the target. We hit here 3730 * mostly. 3731 */ 3732 uint32_t s_cwnd; 3733 3734 meth = 2; 3735 s_cwnd = min((cwnd + bytes_this_ack), target_cwnd); 3736 if (s_cwnd > cwnd) 3737 cwnd = s_cwnd; 3738 else if (bbr_cwnd_may_shrink || bbr->rc_use_google || bbr->rc_no_pacing) 3739 cwnd = s_cwnd; 3740 } else { 3741 /* 3742 * Here we are still in startup, we increase cwnd by what 3743 * has been acked. 3744 */ 3745 if ((cwnd < target_cwnd) || 3746 (bbr->rc_past_init_win == 0)) { 3747 meth = 3; 3748 cwnd += bytes_this_ack; 3749 } else { 3750 /* 3751 * Method 4 means we are at target so no gain in 3752 * startup and past the initial window. 3753 */ 3754 meth = 4; 3755 } 3756 } 3757 tp->snd_cwnd = max(cwnd, get_min_cwnd(bbr)); 3758 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, prev_acked, meth, target_cwnd, th->th_ack, line); 3759 } 3760 3761 static void 3762 tcp_bbr_partialack(struct tcpcb *tp) 3763 { 3764 struct tcp_bbr *bbr; 3765 3766 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3767 INP_WLOCK_ASSERT(tp->t_inpcb); 3768 if (ctf_flight_size(tp, 3769 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 3770 tp->snd_cwnd) { 3771 bbr->r_wanted_output = 1; 3772 } 3773 } 3774 3775 static void 3776 bbr_post_recovery(struct tcpcb *tp) 3777 { 3778 struct tcp_bbr *bbr; 3779 uint32_t flight; 3780 3781 INP_WLOCK_ASSERT(tp->t_inpcb); 3782 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3783 /* 3784 * Here we just exit recovery. 3785 */ 3786 EXIT_RECOVERY(tp->t_flags); 3787 /* Lock in our b/w reduction for the specified number of pkt-epochs */ 3788 bbr->r_recovery_bw = 0; 3789 tp->snd_recover = tp->snd_una; 3790 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3791 bbr->pkt_conservation = 0; 3792 if (bbr->rc_use_google == 0) { 3793 /* 3794 * For non-google mode lets 3795 * go ahead and make sure we clear 3796 * the recovery state so if we 3797 * bounce back in to recovery we 3798 * will do PC. 3799 */ 3800 bbr->bbr_prev_in_rec = 0; 3801 } 3802 bbr_log_type_exit_rec(bbr); 3803 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 3804 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 3805 bbr_log_type_cwndupd(bbr, 0, 0, 0, 15, 0, 0, __LINE__); 3806 } else { 3807 /* For probe-rtt case lets fix up its saved_cwnd */ 3808 if (bbr->r_ctl.rc_saved_cwnd < bbr->r_ctl.rc_cwnd_on_ent) { 3809 bbr->r_ctl.rc_saved_cwnd = bbr->r_ctl.rc_cwnd_on_ent; 3810 bbr_log_type_cwndupd(bbr, 0, 0, 0, 16, 0, 0, __LINE__); 3811 } 3812 } 3813 flight = ctf_flight_size(tp, 3814 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3815 if ((bbr->rc_use_google == 0) && 3816 bbr_do_red) { 3817 uint64_t val, lr2use; 3818 uint32_t maxseg, newcwnd, acks_inflight, ratio, cwnd; 3819 uint32_t *cwnd_p; 3820 3821 if (bbr_get_rtt(bbr, BBR_SRTT)) { 3822 val = ((uint64_t)bbr_get_rtt(bbr, BBR_RTT_PROP) * (uint64_t)1000); 3823 val /= bbr_get_rtt(bbr, BBR_SRTT); 3824 ratio = (uint32_t)val; 3825 } else 3826 ratio = 1000; 3827 3828 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, 3829 bbr->r_ctl.recovery_lr, 21, 3830 ratio, 3831 bbr->r_ctl.rc_red_cwnd_pe, 3832 __LINE__); 3833 if ((ratio < bbr_do_red) || (bbr_do_red == 0)) 3834 goto done; 3835 if (((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3836 bbr_prtt_slam_cwnd) || 3837 (bbr_sub_drain_slam_cwnd && 3838 (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 3839 bbr->rc_hit_state_1 && 3840 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) || 3841 ((bbr->rc_bbr_state == BBR_STATE_DRAIN) && 3842 bbr_slam_cwnd_in_main_drain)) { 3843 /* 3844 * Here we must poke at the saved cwnd 3845 * as well as the cwnd. 3846 */ 3847 cwnd = bbr->r_ctl.rc_saved_cwnd; 3848 cwnd_p = &bbr->r_ctl.rc_saved_cwnd; 3849 } else { 3850 cwnd = tp->snd_cwnd; 3851 cwnd_p = &tp->snd_cwnd; 3852 } 3853 maxseg = tp->t_maxseg - bbr->rc_last_options; 3854 /* Add the overall lr with the recovery lr */ 3855 if (bbr->r_ctl.rc_lost == 0) 3856 lr2use = 0; 3857 else if (bbr->r_ctl.rc_delivered == 0) 3858 lr2use = 1000; 3859 else { 3860 lr2use = bbr->r_ctl.rc_lost * 1000; 3861 lr2use /= bbr->r_ctl.rc_delivered; 3862 } 3863 lr2use += bbr->r_ctl.recovery_lr; 3864 acks_inflight = (flight / (maxseg * 2)); 3865 if (bbr_red_scale) { 3866 lr2use *= bbr_get_rtt(bbr, BBR_SRTT); 3867 lr2use /= bbr_red_scale; 3868 if ((bbr_red_growth_restrict) && 3869 ((bbr_get_rtt(bbr, BBR_SRTT)/bbr_red_scale) > 1)) 3870 bbr->r_ctl.restrict_growth += acks_inflight; 3871 } 3872 if (lr2use) { 3873 val = (uint64_t)cwnd * lr2use; 3874 val /= 1000; 3875 if (cwnd > val) 3876 newcwnd = roundup((cwnd - val), maxseg); 3877 else 3878 newcwnd = maxseg; 3879 } else { 3880 val = (uint64_t)cwnd * (uint64_t)bbr_red_mul; 3881 val /= (uint64_t)bbr_red_div; 3882 newcwnd = roundup((uint32_t)val, maxseg); 3883 } 3884 /* with standard delayed acks how many acks can I expect? */ 3885 if (bbr_drop_limit == 0) { 3886 /* 3887 * Anticpate how much we will 3888 * raise the cwnd based on the acks. 3889 */ 3890 if ((newcwnd + (acks_inflight * maxseg)) < get_min_cwnd(bbr)) { 3891 /* We do enforce the min (with the acks) */ 3892 newcwnd = (get_min_cwnd(bbr) - acks_inflight); 3893 } 3894 } else { 3895 /* 3896 * A strict drop limit of N is is inplace 3897 */ 3898 if (newcwnd < (bbr_drop_limit * maxseg)) { 3899 newcwnd = bbr_drop_limit * maxseg; 3900 } 3901 } 3902 /* For the next N acks do we restrict the growth */ 3903 *cwnd_p = newcwnd; 3904 if (tp->snd_cwnd > newcwnd) 3905 tp->snd_cwnd = newcwnd; 3906 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, val, 22, 3907 (uint32_t)lr2use, 3908 bbr_get_rtt(bbr, BBR_SRTT), __LINE__); 3909 bbr->r_ctl.rc_red_cwnd_pe = bbr->r_ctl.rc_pkt_epoch; 3910 } 3911 done: 3912 bbr->r_ctl.recovery_lr = 0; 3913 if (flight <= tp->snd_cwnd) { 3914 bbr->r_wanted_output = 1; 3915 } 3916 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3917 } 3918 3919 static void 3920 bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts) 3921 { 3922 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3923 /* Limit the drop in b/w to 1/2 our current filter. */ 3924 if (bbr->r_ctl.red_bw > bbr->r_ctl.rc_bbr_cur_del_rate) 3925 bbr->r_ctl.red_bw = bbr->r_ctl.rc_bbr_cur_del_rate; 3926 if (bbr->r_ctl.red_bw < (get_filter_value(&bbr->r_ctl.rc_delrate) / 2)) 3927 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate) / 2; 3928 tcp_bbr_tso_size_check(bbr, cts); 3929 } 3930 3931 static void 3932 bbr_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type, struct bbr_sendmap *rsm) 3933 { 3934 struct tcp_bbr *bbr; 3935 3936 INP_WLOCK_ASSERT(tp->t_inpcb); 3937 #ifdef STATS 3938 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_CSIG, type); 3939 #endif 3940 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3941 switch (type) { 3942 case CC_NDUPACK: 3943 if (!IN_RECOVERY(tp->t_flags)) { 3944 tp->snd_recover = tp->snd_max; 3945 /* Start a new epoch */ 3946 bbr_set_pktepoch(bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 3947 if (bbr->rc_lt_is_sampling || bbr->rc_lt_use_bw) { 3948 /* 3949 * Move forward the lt epoch 3950 * so it won't count the truncated 3951 * epoch. 3952 */ 3953 bbr->r_ctl.rc_lt_epoch++; 3954 } 3955 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 3956 /* 3957 * Just like the policer detection code 3958 * if we are in startup we must push 3959 * forward the last startup epoch 3960 * to hide the truncated PE. 3961 */ 3962 bbr->r_ctl.rc_bbr_last_startup_epoch++; 3963 } 3964 bbr->r_ctl.rc_cwnd_on_ent = tp->snd_cwnd; 3965 ENTER_RECOVERY(tp->t_flags); 3966 bbr->rc_tlp_rtx_out = 0; 3967 bbr->r_ctl.recovery_lr = bbr->r_ctl.rc_pkt_epoch_loss_rate; 3968 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3969 if (bbr->rc_inp->inp_in_hpts && 3970 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) == 0)) { 3971 /* 3972 * When we enter recovery, we need to restart 3973 * any timers. This may mean we gain an agg 3974 * early, which will be made up for at the last 3975 * rxt out. 3976 */ 3977 bbr->rc_timer_first = 1; 3978 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 3979 } 3980 /* 3981 * Calculate a new cwnd based on to the current 3982 * delivery rate with no gain. We get the bdp 3983 * without gaining it up like we normally would and 3984 * we use the last cur_del_rate. 3985 */ 3986 if ((bbr->rc_use_google == 0) && 3987 (bbr->r_ctl.bbr_rttprobe_gain_val || 3988 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT))) { 3989 tp->snd_cwnd = ctf_flight_size(tp, 3990 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 3991 (tp->t_maxseg - bbr->rc_last_options); 3992 if (tp->snd_cwnd < get_min_cwnd(bbr)) { 3993 /* We always gate to min cwnd */ 3994 tp->snd_cwnd = get_min_cwnd(bbr); 3995 } 3996 bbr_log_type_cwndupd(bbr, 0, 0, 0, 14, 0, 0, __LINE__); 3997 } 3998 bbr_log_type_enter_rec(bbr, rsm->r_start); 3999 } 4000 break; 4001 case CC_RTO_ERR: 4002 KMOD_TCPSTAT_INC(tcps_sndrexmitbad); 4003 /* RTO was unnecessary, so reset everything. */ 4004 bbr_reset_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime); 4005 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 4006 tp->snd_cwnd = tp->snd_cwnd_prev; 4007 tp->snd_ssthresh = tp->snd_ssthresh_prev; 4008 tp->snd_recover = tp->snd_recover_prev; 4009 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 4010 bbr_log_type_cwndupd(bbr, 0, 0, 0, 13, 0, 0, __LINE__); 4011 } 4012 tp->t_badrxtwin = 0; 4013 break; 4014 } 4015 } 4016 4017 /* 4018 * Indicate whether this ack should be delayed. We can delay the ack if 4019 * following conditions are met: 4020 * - There is no delayed ack timer in progress. 4021 * - Our last ack wasn't a 0-sized window. We never want to delay 4022 * the ack that opens up a 0-sized window. 4023 * - LRO wasn't used for this segment. We make sure by checking that the 4024 * segment size is not larger than the MSS. 4025 * - Delayed acks are enabled or this is a half-synchronized T/TCP 4026 * connection. 4027 * - The data being acked is less than a full segment (a stretch ack 4028 * of more than a segment we should ack. 4029 * - nsegs is 1 (if its more than that we received more than 1 ack). 4030 */ 4031 #define DELAY_ACK(tp, bbr, nsegs) \ 4032 (((tp->t_flags & TF_RXWIN0SENT) == 0) && \ 4033 ((tp->t_flags & TF_DELACK) == 0) && \ 4034 ((bbr->bbr_segs_rcvd + nsegs) < tp->t_delayed_ack) && \ 4035 (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN))) 4036 4037 /* 4038 * Return the lowest RSM in the map of 4039 * packets still in flight that is not acked. 4040 * This should normally find on the first one 4041 * since we remove packets from the send 4042 * map after they are marked ACKED. 4043 */ 4044 static struct bbr_sendmap * 4045 bbr_find_lowest_rsm(struct tcp_bbr *bbr) 4046 { 4047 struct bbr_sendmap *rsm; 4048 4049 /* 4050 * Walk the time-order transmitted list looking for an rsm that is 4051 * not acked. This will be the one that was sent the longest time 4052 * ago that is still outstanding. 4053 */ 4054 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_tmap, r_tnext) { 4055 if (rsm->r_flags & BBR_ACKED) { 4056 continue; 4057 } 4058 goto finish; 4059 } 4060 finish: 4061 return (rsm); 4062 } 4063 4064 static struct bbr_sendmap * 4065 bbr_find_high_nonack(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 4066 { 4067 struct bbr_sendmap *prsm; 4068 4069 /* 4070 * Walk the sequence order list backward until we hit and arrive at 4071 * the highest seq not acked. In theory when this is called it 4072 * should be the last segment (which it was not). 4073 */ 4074 prsm = rsm; 4075 TAILQ_FOREACH_REVERSE_FROM(prsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4076 if (prsm->r_flags & (BBR_ACKED | BBR_HAS_FIN)) { 4077 continue; 4078 } 4079 return (prsm); 4080 } 4081 return (NULL); 4082 } 4083 4084 /* 4085 * Returns to the caller the number of microseconds that 4086 * the packet can be outstanding before we think we 4087 * should have had an ack returned. 4088 */ 4089 static uint32_t 4090 bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm) 4091 { 4092 /* 4093 * lro is the flag we use to determine if we have seen reordering. 4094 * If it gets set we have seen reordering. The reorder logic either 4095 * works in one of two ways: 4096 * 4097 * If reorder-fade is configured, then we track the last time we saw 4098 * re-ordering occur. If we reach the point where enough time as 4099 * passed we no longer consider reordering has occuring. 4100 * 4101 * Or if reorder-face is 0, then once we see reordering we consider 4102 * the connection to alway be subject to reordering and just set lro 4103 * to 1. 4104 * 4105 * In the end if lro is non-zero we add the extra time for 4106 * reordering in. 4107 */ 4108 int32_t lro; 4109 uint32_t thresh, t_rxtcur; 4110 4111 if (srtt == 0) 4112 srtt = 1; 4113 if (bbr->r_ctl.rc_reorder_ts) { 4114 if (bbr->r_ctl.rc_reorder_fade) { 4115 if (SEQ_GEQ(cts, bbr->r_ctl.rc_reorder_ts)) { 4116 lro = cts - bbr->r_ctl.rc_reorder_ts; 4117 if (lro == 0) { 4118 /* 4119 * No time as passed since the last 4120 * reorder, mark it as reordering. 4121 */ 4122 lro = 1; 4123 } 4124 } else { 4125 /* Negative time? */ 4126 lro = 0; 4127 } 4128 if (lro > bbr->r_ctl.rc_reorder_fade) { 4129 /* Turn off reordering seen too */ 4130 bbr->r_ctl.rc_reorder_ts = 0; 4131 lro = 0; 4132 } 4133 } else { 4134 /* Reodering does not fade */ 4135 lro = 1; 4136 } 4137 } else { 4138 lro = 0; 4139 } 4140 thresh = srtt + bbr->r_ctl.rc_pkt_delay; 4141 if (lro) { 4142 /* It must be set, if not you get 1/4 rtt */ 4143 if (bbr->r_ctl.rc_reorder_shift) 4144 thresh += (srtt >> bbr->r_ctl.rc_reorder_shift); 4145 else 4146 thresh += (srtt >> 2); 4147 } else { 4148 thresh += 1000; 4149 } 4150 /* We don't let the rack timeout be above a RTO */ 4151 if ((bbr->rc_tp)->t_srtt == 0) 4152 t_rxtcur = BBR_INITIAL_RTO; 4153 else 4154 t_rxtcur = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 4155 if (thresh > t_rxtcur) { 4156 thresh = t_rxtcur; 4157 } 4158 /* And we don't want it above the RTO max either */ 4159 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4160 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4161 } 4162 bbr_log_thresh_choice(bbr, cts, thresh, lro, srtt, rsm, BBR_TO_FRM_RACK); 4163 return (thresh); 4164 } 4165 4166 /* 4167 * Return to the caller the amount of time in mico-seconds 4168 * that should be used for the TLP timer from the last 4169 * send time of this packet. 4170 */ 4171 static uint32_t 4172 bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, 4173 struct bbr_sendmap *rsm, uint32_t srtt, 4174 uint32_t cts) 4175 { 4176 uint32_t thresh, len, maxseg, t_rxtcur; 4177 struct bbr_sendmap *prsm; 4178 4179 if (srtt == 0) 4180 srtt = 1; 4181 if (bbr->rc_tlp_threshold) 4182 thresh = srtt + (srtt / bbr->rc_tlp_threshold); 4183 else 4184 thresh = (srtt * 2); 4185 maxseg = tp->t_maxseg - bbr->rc_last_options; 4186 /* Get the previous sent packet, if any */ 4187 len = rsm->r_end - rsm->r_start; 4188 4189 /* 2.1 behavior */ 4190 prsm = TAILQ_PREV(rsm, bbr_head, r_tnext); 4191 if (prsm && (len <= maxseg)) { 4192 /* 4193 * Two packets outstanding, thresh should be (2*srtt) + 4194 * possible inter-packet delay (if any). 4195 */ 4196 uint32_t inter_gap = 0; 4197 int idx, nidx; 4198 4199 idx = rsm->r_rtr_cnt - 1; 4200 nidx = prsm->r_rtr_cnt - 1; 4201 if (TSTMP_GEQ(rsm->r_tim_lastsent[nidx], prsm->r_tim_lastsent[idx])) { 4202 /* Yes it was sent later (or at the same time) */ 4203 inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx]; 4204 } 4205 thresh += inter_gap; 4206 } else if (len <= maxseg) { 4207 /* 4208 * Possibly compensate for delayed-ack. 4209 */ 4210 uint32_t alt_thresh; 4211 4212 alt_thresh = srtt + (srtt / 2) + bbr_delayed_ack_time; 4213 if (alt_thresh > thresh) 4214 thresh = alt_thresh; 4215 } 4216 /* Not above the current RTO */ 4217 if (tp->t_srtt == 0) 4218 t_rxtcur = BBR_INITIAL_RTO; 4219 else 4220 t_rxtcur = TICKS_2_USEC(tp->t_rxtcur); 4221 4222 bbr_log_thresh_choice(bbr, cts, thresh, t_rxtcur, srtt, rsm, BBR_TO_FRM_TLP); 4223 /* Not above an RTO */ 4224 if (thresh > t_rxtcur) { 4225 thresh = t_rxtcur; 4226 } 4227 /* Not above a RTO max */ 4228 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4229 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4230 } 4231 /* And now apply the user TLP min */ 4232 if (thresh < bbr_tlp_min) { 4233 thresh = bbr_tlp_min; 4234 } 4235 return (thresh); 4236 } 4237 4238 /* 4239 * Return one of three RTTs to use (in microseconds). 4240 */ 4241 static __inline uint32_t 4242 bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type) 4243 { 4244 uint32_t f_rtt; 4245 uint32_t srtt; 4246 4247 f_rtt = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 4248 if (get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) { 4249 /* We have no rtt at all */ 4250 if (bbr->rc_tp->t_srtt == 0) 4251 f_rtt = BBR_INITIAL_RTO; 4252 else 4253 f_rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4254 /* 4255 * Since we don't know how good the rtt is apply a 4256 * delayed-ack min 4257 */ 4258 if (f_rtt < bbr_delayed_ack_time) { 4259 f_rtt = bbr_delayed_ack_time; 4260 } 4261 } 4262 /* Take the filter version or last measured pkt-rtt */ 4263 if (rtt_type == BBR_RTT_PROP) { 4264 srtt = f_rtt; 4265 } else if (rtt_type == BBR_RTT_PKTRTT) { 4266 if (bbr->r_ctl.rc_pkt_epoch_rtt) { 4267 srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 4268 } else { 4269 /* No pkt rtt yet */ 4270 srtt = f_rtt; 4271 } 4272 } else if (rtt_type == BBR_RTT_RACK) { 4273 srtt = bbr->r_ctl.rc_last_rtt; 4274 /* We need to add in any internal delay for our timer */ 4275 if (bbr->rc_ack_was_delayed) 4276 srtt += bbr->r_ctl.rc_ack_hdwr_delay; 4277 } else if (rtt_type == BBR_SRTT) { 4278 srtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4279 } else { 4280 /* TSNH */ 4281 srtt = f_rtt; 4282 #ifdef BBR_INVARIANTS 4283 panic("Unknown rtt request type %d", rtt_type); 4284 #endif 4285 } 4286 return (srtt); 4287 } 4288 4289 static int 4290 bbr_is_lost(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t cts) 4291 { 4292 uint32_t thresh; 4293 4294 thresh = bbr_calc_thresh_rack(bbr, bbr_get_rtt(bbr, BBR_RTT_RACK), 4295 cts, rsm); 4296 if ((cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) >= thresh) { 4297 /* It is lost (past time) */ 4298 return (1); 4299 } 4300 return (0); 4301 } 4302 4303 /* 4304 * Return a sendmap if we need to retransmit something. 4305 */ 4306 static struct bbr_sendmap * 4307 bbr_check_recovery_mode(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4308 { 4309 /* 4310 * Check to see that we don't need to fall into recovery. We will 4311 * need to do so if our oldest transmit is past the time we should 4312 * have had an ack. 4313 */ 4314 4315 struct bbr_sendmap *rsm; 4316 int32_t idx; 4317 4318 if (TAILQ_EMPTY(&bbr->r_ctl.rc_map)) { 4319 /* Nothing outstanding that we know of */ 4320 return (NULL); 4321 } 4322 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 4323 if (rsm == NULL) { 4324 /* Nothing in the transmit map */ 4325 return (NULL); 4326 } 4327 if (tp->t_flags & TF_SENTFIN) { 4328 /* Fin restricted, don't find anything once a fin is sent */ 4329 return (NULL); 4330 } 4331 if (rsm->r_flags & BBR_ACKED) { 4332 /* 4333 * Ok the first one is acked (this really should not happen 4334 * since we remove the from the tmap once they are acked) 4335 */ 4336 rsm = bbr_find_lowest_rsm(bbr); 4337 if (rsm == NULL) 4338 return (NULL); 4339 } 4340 idx = rsm->r_rtr_cnt - 1; 4341 if (SEQ_LEQ(cts, rsm->r_tim_lastsent[idx])) { 4342 /* Send timestamp is the same or less? can't be ready */ 4343 return (NULL); 4344 } 4345 /* Get our RTT time */ 4346 if (bbr_is_lost(bbr, rsm, cts) && 4347 ((rsm->r_dupack >= DUP_ACK_THRESHOLD) || 4348 (rsm->r_flags & BBR_SACK_PASSED))) { 4349 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4350 rsm->r_flags |= BBR_MARKED_LOST; 4351 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4352 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4353 } 4354 bbr_cong_signal(tp, NULL, CC_NDUPACK, rsm); 4355 #ifdef BBR_INVARIANTS 4356 if ((rsm->r_end - rsm->r_start) == 0) 4357 panic("tp:%p bbr:%p rsm:%p length is 0?", tp, bbr, rsm); 4358 #endif 4359 return (rsm); 4360 } 4361 return (NULL); 4362 } 4363 4364 /* 4365 * RACK Timer, here we simply do logging and house keeping. 4366 * the normal bbr_output_wtime() function will call the 4367 * appropriate thing to check if we need to do a RACK retransmit. 4368 * We return 1, saying don't proceed with bbr_output_wtime only 4369 * when all timers have been stopped (destroyed PCB?). 4370 */ 4371 static int 4372 bbr_timeout_rack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4373 { 4374 /* 4375 * This timer simply provides an internal trigger to send out data. 4376 * The check_recovery_mode call will see if there are needed 4377 * retransmissions, if so we will enter fast-recovery. The output 4378 * call may or may not do the same thing depending on sysctl 4379 * settings. 4380 */ 4381 uint32_t lost; 4382 4383 if (bbr->rc_all_timers_stopped) { 4384 return (1); 4385 } 4386 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4387 /* Its not time yet */ 4388 return (0); 4389 } 4390 BBR_STAT_INC(bbr_to_tot); 4391 lost = bbr->r_ctl.rc_lost; 4392 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4393 bbr_set_state(tp, bbr, 0); 4394 bbr_log_to_event(bbr, cts, BBR_TO_FRM_RACK); 4395 if (bbr->r_ctl.rc_resend == NULL) { 4396 /* Lets do the check here */ 4397 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 4398 } 4399 if (bbr_policer_call_from_rack_to) 4400 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 4401 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK; 4402 return (0); 4403 } 4404 4405 static __inline void 4406 bbr_clone_rsm(struct tcp_bbr *bbr, struct bbr_sendmap *nrsm, struct bbr_sendmap *rsm, uint32_t start) 4407 { 4408 int idx; 4409 4410 nrsm->r_start = start; 4411 nrsm->r_end = rsm->r_end; 4412 nrsm->r_rtr_cnt = rsm->r_rtr_cnt; 4413 nrsm-> r_rtt_not_allowed = rsm->r_rtt_not_allowed; 4414 nrsm->r_flags = rsm->r_flags; 4415 /* We don't transfer forward the SYN flag */ 4416 nrsm->r_flags &= ~BBR_HAS_SYN; 4417 /* We move forward the FIN flag, not that this should happen */ 4418 rsm->r_flags &= ~BBR_HAS_FIN; 4419 nrsm->r_dupack = rsm->r_dupack; 4420 nrsm->r_rtr_bytes = 0; 4421 nrsm->r_is_gain = rsm->r_is_gain; 4422 nrsm->r_is_drain = rsm->r_is_drain; 4423 nrsm->r_delivered = rsm->r_delivered; 4424 nrsm->r_ts_valid = rsm->r_ts_valid; 4425 nrsm->r_del_ack_ts = rsm->r_del_ack_ts; 4426 nrsm->r_del_time = rsm->r_del_time; 4427 nrsm->r_app_limited = rsm->r_app_limited; 4428 nrsm->r_first_sent_time = rsm->r_first_sent_time; 4429 nrsm->r_flight_at_send = rsm->r_flight_at_send; 4430 /* We split a piece the lower section looses any just_ret flag. */ 4431 nrsm->r_bbr_state = rsm->r_bbr_state; 4432 for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { 4433 nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; 4434 } 4435 rsm->r_end = nrsm->r_start; 4436 idx = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 4437 idx /= 8; 4438 /* Check if we got too small */ 4439 if ((rsm->r_is_smallmap == 0) && 4440 ((rsm->r_end - rsm->r_start) <= idx)) { 4441 bbr->r_ctl.rc_num_small_maps_alloced++; 4442 rsm->r_is_smallmap = 1; 4443 } 4444 /* Check the new one as well */ 4445 if ((nrsm->r_end - nrsm->r_start) <= idx) { 4446 bbr->r_ctl.rc_num_small_maps_alloced++; 4447 nrsm->r_is_smallmap = 1; 4448 } 4449 } 4450 4451 static int 4452 bbr_sack_mergable(struct bbr_sendmap *at, 4453 uint32_t start, uint32_t end) 4454 { 4455 /* 4456 * Given a sack block defined by 4457 * start and end, and a current postion 4458 * at. Return 1 if either side of at 4459 * would show that the block is mergable 4460 * to that side. A block to be mergable 4461 * must have overlap with the start/end 4462 * and be in the SACK'd state. 4463 */ 4464 struct bbr_sendmap *l_rsm; 4465 struct bbr_sendmap *r_rsm; 4466 4467 /* first get the either side blocks */ 4468 l_rsm = TAILQ_PREV(at, bbr_head, r_next); 4469 r_rsm = TAILQ_NEXT(at, r_next); 4470 if (l_rsm && (l_rsm->r_flags & BBR_ACKED)) { 4471 /* Potentially mergeable */ 4472 if ((l_rsm->r_end == start) || 4473 (SEQ_LT(start, l_rsm->r_end) && 4474 SEQ_GT(end, l_rsm->r_end))) { 4475 /* 4476 * map blk |------| 4477 * sack blk |------| 4478 * <or> 4479 * map blk |------| 4480 * sack blk |------| 4481 */ 4482 return (1); 4483 } 4484 } 4485 if (r_rsm && (r_rsm->r_flags & BBR_ACKED)) { 4486 /* Potentially mergeable */ 4487 if ((r_rsm->r_start == end) || 4488 (SEQ_LT(start, r_rsm->r_start) && 4489 SEQ_GT(end, r_rsm->r_start))) { 4490 /* 4491 * map blk |---------| 4492 * sack blk |----| 4493 * <or> 4494 * map blk |---------| 4495 * sack blk |-------| 4496 */ 4497 return (1); 4498 } 4499 } 4500 return (0); 4501 } 4502 4503 static struct bbr_sendmap * 4504 bbr_merge_rsm(struct tcp_bbr *bbr, 4505 struct bbr_sendmap *l_rsm, 4506 struct bbr_sendmap *r_rsm) 4507 { 4508 /* 4509 * We are merging two ack'd RSM's, 4510 * the l_rsm is on the left (lower seq 4511 * values) and the r_rsm is on the right 4512 * (higher seq value). The simplest way 4513 * to merge these is to move the right 4514 * one into the left. I don't think there 4515 * is any reason we need to try to find 4516 * the oldest (or last oldest retransmitted). 4517 */ 4518 l_rsm->r_end = r_rsm->r_end; 4519 if (l_rsm->r_dupack < r_rsm->r_dupack) 4520 l_rsm->r_dupack = r_rsm->r_dupack; 4521 if (r_rsm->r_rtr_bytes) 4522 l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes; 4523 if (r_rsm->r_in_tmap) { 4524 /* This really should not happen */ 4525 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, r_rsm, r_tnext); 4526 } 4527 if (r_rsm->r_app_limited) 4528 l_rsm->r_app_limited = r_rsm->r_app_limited; 4529 /* Now the flags */ 4530 if (r_rsm->r_flags & BBR_HAS_FIN) 4531 l_rsm->r_flags |= BBR_HAS_FIN; 4532 if (r_rsm->r_flags & BBR_TLP) 4533 l_rsm->r_flags |= BBR_TLP; 4534 if (r_rsm->r_flags & BBR_RWND_COLLAPSED) 4535 l_rsm->r_flags |= BBR_RWND_COLLAPSED; 4536 if (r_rsm->r_flags & BBR_MARKED_LOST) { 4537 /* This really should not happen */ 4538 bbr->r_ctl.rc_lost_bytes -= r_rsm->r_end - r_rsm->r_start; 4539 } 4540 TAILQ_REMOVE(&bbr->r_ctl.rc_map, r_rsm, r_next); 4541 if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) { 4542 /* Transfer the split limit to the map we free */ 4543 r_rsm->r_limit_type = l_rsm->r_limit_type; 4544 l_rsm->r_limit_type = 0; 4545 } 4546 bbr_free(bbr, r_rsm); 4547 return(l_rsm); 4548 } 4549 4550 /* 4551 * TLP Timer, here we simply setup what segment we want to 4552 * have the TLP expire on, the normal bbr_output_wtime() will then 4553 * send it out. 4554 * 4555 * We return 1, saying don't proceed with bbr_output_wtime only 4556 * when all timers have been stopped (destroyed PCB?). 4557 */ 4558 static int 4559 bbr_timeout_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4560 { 4561 /* 4562 * Tail Loss Probe. 4563 */ 4564 struct bbr_sendmap *rsm = NULL; 4565 struct socket *so; 4566 uint32_t amm; 4567 uint32_t out, avail; 4568 uint32_t maxseg; 4569 int collapsed_win = 0; 4570 4571 if (bbr->rc_all_timers_stopped) { 4572 return (1); 4573 } 4574 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4575 /* Its not time yet */ 4576 return (0); 4577 } 4578 if (ctf_progress_timeout_check(tp, true)) { 4579 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 4580 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4581 return (1); 4582 } 4583 /* Did we somehow get into persists? */ 4584 if (bbr->rc_in_persist) { 4585 return (0); 4586 } 4587 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4588 bbr_set_state(tp, bbr, 0); 4589 BBR_STAT_INC(bbr_tlp_tot); 4590 maxseg = tp->t_maxseg - bbr->rc_last_options; 4591 /* 4592 * A TLP timer has expired. We have been idle for 2 rtts. So we now 4593 * need to figure out how to force a full MSS segment out. 4594 */ 4595 so = tp->t_inpcb->inp_socket; 4596 avail = sbavail(&so->so_snd); 4597 out = ctf_outstanding(tp); 4598 if (out > tp->snd_wnd) { 4599 /* special case, we need a retransmission */ 4600 collapsed_win = 1; 4601 goto need_retran; 4602 } 4603 if (avail > out) { 4604 /* New data is available */ 4605 amm = avail - out; 4606 if (amm > maxseg) { 4607 amm = maxseg; 4608 } else if ((amm < maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) { 4609 /* not enough to fill a MTU and no-delay is off */ 4610 goto need_retran; 4611 } 4612 /* Set the send-new override */ 4613 if ((out + amm) <= tp->snd_wnd) { 4614 bbr->rc_tlp_new_data = 1; 4615 } else { 4616 goto need_retran; 4617 } 4618 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 4619 bbr->r_ctl.rc_last_tlp_seq = tp->snd_max; 4620 bbr->r_ctl.rc_tlp_send = NULL; 4621 /* cap any slots */ 4622 BBR_STAT_INC(bbr_tlp_newdata); 4623 goto send; 4624 } 4625 need_retran: 4626 /* 4627 * Ok we need to arrange the last un-acked segment to be re-sent, or 4628 * optionally the first un-acked segment. 4629 */ 4630 if (collapsed_win == 0) { 4631 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 4632 if (rsm && (BBR_ACKED | BBR_HAS_FIN)) { 4633 rsm = bbr_find_high_nonack(bbr, rsm); 4634 } 4635 if (rsm == NULL) { 4636 goto restore; 4637 } 4638 } else { 4639 /* 4640 * We must find the last segment 4641 * that was acceptable by the client. 4642 */ 4643 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4644 if ((rsm->r_flags & BBR_RWND_COLLAPSED) == 0) { 4645 /* Found one */ 4646 break; 4647 } 4648 } 4649 if (rsm == NULL) { 4650 /* None? if so send the first */ 4651 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 4652 if (rsm == NULL) 4653 goto restore; 4654 } 4655 } 4656 if ((rsm->r_end - rsm->r_start) > maxseg) { 4657 /* 4658 * We need to split this the last segment in two. 4659 */ 4660 struct bbr_sendmap *nrsm; 4661 4662 nrsm = bbr_alloc_full_limit(bbr); 4663 if (nrsm == NULL) { 4664 /* 4665 * We can't get memory to split, we can either just 4666 * not split it. Or retransmit the whole piece, lets 4667 * do the large send (BTLP :-) ). 4668 */ 4669 goto go_for_it; 4670 } 4671 bbr_clone_rsm(bbr, nrsm, rsm, (rsm->r_end - maxseg)); 4672 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 4673 if (rsm->r_in_tmap) { 4674 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 4675 nrsm->r_in_tmap = 1; 4676 } 4677 rsm->r_flags &= (~BBR_HAS_FIN); 4678 rsm = nrsm; 4679 } 4680 go_for_it: 4681 bbr->r_ctl.rc_tlp_send = rsm; 4682 bbr->rc_tlp_rtx_out = 1; 4683 if (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) { 4684 bbr->r_ctl.rc_tlp_seg_send_cnt++; 4685 tp->t_rxtshift++; 4686 } else { 4687 bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; 4688 bbr->r_ctl.rc_tlp_seg_send_cnt = 1; 4689 } 4690 send: 4691 if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { 4692 /* 4693 * Can't [re]/transmit a segment we have retranmitted the 4694 * max times. We need the retransmit timer to take over. 4695 */ 4696 restore: 4697 bbr->rc_tlp_new_data = 0; 4698 bbr->r_ctl.rc_tlp_send = NULL; 4699 if (rsm) 4700 rsm->r_flags &= ~BBR_TLP; 4701 BBR_STAT_INC(bbr_tlp_retran_fail); 4702 return (0); 4703 } else if (rsm) { 4704 rsm->r_flags |= BBR_TLP; 4705 } 4706 if (rsm && (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) && 4707 (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend)) { 4708 /* 4709 * We have retransmitted to many times for TLP. Switch to 4710 * the regular RTO timer 4711 */ 4712 goto restore; 4713 } 4714 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TLP); 4715 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; 4716 return (0); 4717 } 4718 4719 /* 4720 * Delayed ack Timer, here we simply need to setup the 4721 * ACK_NOW flag and remove the DELACK flag. From there 4722 * the output routine will send the ack out. 4723 * 4724 * We only return 1, saying don't proceed, if all timers 4725 * are stopped (destroyed PCB?). 4726 */ 4727 static int 4728 bbr_timeout_delack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4729 { 4730 if (bbr->rc_all_timers_stopped) { 4731 return (1); 4732 } 4733 bbr_log_to_event(bbr, cts, BBR_TO_FRM_DELACK); 4734 tp->t_flags &= ~TF_DELACK; 4735 tp->t_flags |= TF_ACKNOW; 4736 KMOD_TCPSTAT_INC(tcps_delack); 4737 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK; 4738 return (0); 4739 } 4740 4741 /* 4742 * Here we send a KEEP-ALIVE like probe to the 4743 * peer, we do not send data. 4744 * 4745 * We only return 1, saying don't proceed, if all timers 4746 * are stopped (destroyed PCB?). 4747 */ 4748 static int 4749 bbr_timeout_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4750 { 4751 struct tcptemp *t_template; 4752 int32_t retval = 1; 4753 4754 if (bbr->rc_all_timers_stopped) { 4755 return (1); 4756 } 4757 if (bbr->rc_in_persist == 0) 4758 return (0); 4759 KASSERT(tp->t_inpcb != NULL, 4760 ("%s: tp %p tp->t_inpcb == NULL", __func__, tp)); 4761 /* 4762 * Persistence timer into zero window. Force a byte to be output, if 4763 * possible. 4764 */ 4765 bbr_log_to_event(bbr, cts, BBR_TO_FRM_PERSIST); 4766 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT; 4767 KMOD_TCPSTAT_INC(tcps_persisttimeo); 4768 /* 4769 * Have we exceeded the user specified progress time? 4770 */ 4771 if (ctf_progress_timeout_check(tp, true)) { 4772 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 4773 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4774 goto out; 4775 } 4776 /* 4777 * Hack: if the peer is dead/unreachable, we do not time out if the 4778 * window is closed. After a full backoff, drop the connection if 4779 * the idle time (no responses to probes) reaches the maximum 4780 * backoff that we would use if retransmitting. 4781 */ 4782 if (tp->t_rxtshift == TCP_MAXRXTSHIFT && 4783 (ticks - tp->t_rcvtime >= tcp_maxpersistidle || 4784 ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { 4785 KMOD_TCPSTAT_INC(tcps_persistdrop); 4786 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX); 4787 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4788 goto out; 4789 } 4790 if ((sbavail(&bbr->rc_inp->inp_socket->so_snd) == 0) && 4791 tp->snd_una == tp->snd_max) { 4792 bbr_exit_persist(tp, bbr, cts, __LINE__); 4793 retval = 0; 4794 goto out; 4795 } 4796 /* 4797 * If the user has closed the socket then drop a persisting 4798 * connection after a much reduced timeout. 4799 */ 4800 if (tp->t_state > TCPS_CLOSE_WAIT && 4801 (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) { 4802 KMOD_TCPSTAT_INC(tcps_persistdrop); 4803 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX); 4804 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4805 goto out; 4806 } 4807 t_template = tcpip_maketemplate(bbr->rc_inp); 4808 if (t_template) { 4809 tcp_respond(tp, t_template->tt_ipgen, 4810 &t_template->tt_t, (struct mbuf *)NULL, 4811 tp->rcv_nxt, tp->snd_una - 1, 0); 4812 /* This sends an ack */ 4813 if (tp->t_flags & TF_DELACK) 4814 tp->t_flags &= ~TF_DELACK; 4815 free(t_template, M_TEMP); 4816 } 4817 if (tp->t_rxtshift < TCP_MAXRXTSHIFT) 4818 tp->t_rxtshift++; 4819 bbr_start_hpts_timer(bbr, tp, cts, 3, 0, 0); 4820 out: 4821 return (retval); 4822 } 4823 4824 /* 4825 * If a keepalive goes off, we had no other timers 4826 * happening. We always return 1 here since this 4827 * routine either drops the connection or sends 4828 * out a segment with respond. 4829 */ 4830 static int 4831 bbr_timeout_keepalive(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4832 { 4833 struct tcptemp *t_template; 4834 struct inpcb *inp; 4835 4836 if (bbr->rc_all_timers_stopped) { 4837 return (1); 4838 } 4839 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP; 4840 inp = tp->t_inpcb; 4841 bbr_log_to_event(bbr, cts, BBR_TO_FRM_KEEP); 4842 /* 4843 * Keep-alive timer went off; send something or drop connection if 4844 * idle for too long. 4845 */ 4846 KMOD_TCPSTAT_INC(tcps_keeptimeo); 4847 if (tp->t_state < TCPS_ESTABLISHED) 4848 goto dropit; 4849 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && 4850 tp->t_state <= TCPS_CLOSING) { 4851 if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp)) 4852 goto dropit; 4853 /* 4854 * Send a packet designed to force a response if the peer is 4855 * up and reachable: either an ACK if the connection is 4856 * still alive, or an RST if the peer has closed the 4857 * connection due to timeout or reboot. Using sequence 4858 * number tp->snd_una-1 causes the transmitted zero-length 4859 * segment to lie outside the receive window; by the 4860 * protocol spec, this requires the correspondent TCP to 4861 * respond. 4862 */ 4863 KMOD_TCPSTAT_INC(tcps_keepprobe); 4864 t_template = tcpip_maketemplate(inp); 4865 if (t_template) { 4866 tcp_respond(tp, t_template->tt_ipgen, 4867 &t_template->tt_t, (struct mbuf *)NULL, 4868 tp->rcv_nxt, tp->snd_una - 1, 0); 4869 free(t_template, M_TEMP); 4870 } 4871 } 4872 bbr_start_hpts_timer(bbr, tp, cts, 4, 0, 0); 4873 return (1); 4874 dropit: 4875 KMOD_TCPSTAT_INC(tcps_keepdrops); 4876 tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX); 4877 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4878 return (1); 4879 } 4880 4881 /* 4882 * Retransmit helper function, clear up all the ack 4883 * flags and take care of important book keeping. 4884 */ 4885 static void 4886 bbr_remxt_tmr(struct tcpcb *tp) 4887 { 4888 /* 4889 * The retransmit timer went off, all sack'd blocks must be 4890 * un-acked. 4891 */ 4892 struct bbr_sendmap *rsm, *trsm = NULL; 4893 struct tcp_bbr *bbr; 4894 uint32_t cts, lost; 4895 4896 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 4897 cts = tcp_get_usecs(&bbr->rc_tv); 4898 lost = bbr->r_ctl.rc_lost; 4899 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4900 bbr_set_state(tp, bbr, 0); 4901 4902 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 4903 if (rsm->r_flags & BBR_ACKED) { 4904 uint32_t old_flags; 4905 4906 rsm->r_dupack = 0; 4907 if (rsm->r_in_tmap == 0) { 4908 /* We must re-add it back to the tlist */ 4909 if (trsm == NULL) { 4910 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 4911 } else { 4912 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, trsm, rsm, r_tnext); 4913 } 4914 rsm->r_in_tmap = 1; 4915 } 4916 old_flags = rsm->r_flags; 4917 rsm->r_flags |= BBR_RXT_CLEARED; 4918 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS); 4919 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 4920 } else { 4921 if ((tp->t_state < TCPS_ESTABLISHED) && 4922 (rsm->r_start == tp->snd_una)) { 4923 /* 4924 * Special case for TCP FO. Where 4925 * we sent more data beyond the snd_max. 4926 * We don't mark that as lost and stop here. 4927 */ 4928 break; 4929 } 4930 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4931 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4932 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4933 } 4934 if (bbr_marks_rxt_sack_passed) { 4935 /* 4936 * With this option, we will rack out 4937 * in 1ms increments the rest of the packets. 4938 */ 4939 rsm->r_flags |= BBR_SACK_PASSED | BBR_MARKED_LOST; 4940 rsm->r_flags &= ~BBR_WAS_SACKPASS; 4941 } else { 4942 /* 4943 * With this option we only mark them lost 4944 * and remove all sack'd markings. We will run 4945 * another RXT or a TLP. This will cause 4946 * us to eventually send more based on what 4947 * ack's come in. 4948 */ 4949 rsm->r_flags |= BBR_MARKED_LOST; 4950 rsm->r_flags &= ~BBR_WAS_SACKPASS; 4951 rsm->r_flags &= ~BBR_SACK_PASSED; 4952 } 4953 } 4954 trsm = rsm; 4955 } 4956 bbr->r_ctl.rc_resend = TAILQ_FIRST(&bbr->r_ctl.rc_map); 4957 /* Clear the count (we just un-acked them) */ 4958 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TMR); 4959 bbr->rc_tlp_new_data = 0; 4960 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 4961 /* zap the behindness on a rxt */ 4962 bbr->r_ctl.rc_hptsi_agg_delay = 0; 4963 bbr->r_agg_early_set = 0; 4964 bbr->r_ctl.rc_agg_early = 0; 4965 bbr->rc_tlp_rtx_out = 0; 4966 bbr->r_ctl.rc_sacked = 0; 4967 bbr->r_ctl.rc_sacklast = NULL; 4968 bbr->r_timer_override = 1; 4969 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 4970 } 4971 4972 /* 4973 * Re-transmit timeout! If we drop the PCB we will return 1, otherwise 4974 * we will setup to retransmit the lowest seq number outstanding. 4975 */ 4976 static int 4977 bbr_timeout_rxt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4978 { 4979 int32_t rexmt; 4980 int32_t retval = 0; 4981 bool isipv6; 4982 4983 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT; 4984 if (bbr->rc_all_timers_stopped) { 4985 return (1); 4986 } 4987 if (TCPS_HAVEESTABLISHED(tp->t_state) && 4988 (tp->snd_una == tp->snd_max)) { 4989 /* Nothing outstanding .. nothing to do */ 4990 return (0); 4991 } 4992 /* 4993 * Retransmission timer went off. Message has not been acked within 4994 * retransmit interval. Back off to a longer retransmit interval 4995 * and retransmit one segment. 4996 */ 4997 if (ctf_progress_timeout_check(tp, true)) { 4998 retval = 1; 4999 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 5000 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 5001 goto out; 5002 } 5003 bbr_remxt_tmr(tp); 5004 if ((bbr->r_ctl.rc_resend == NULL) || 5005 ((bbr->r_ctl.rc_resend->r_flags & BBR_RWND_COLLAPSED) == 0)) { 5006 /* 5007 * If the rwnd collapsed on 5008 * the one we are retransmitting 5009 * it does not count against the 5010 * rxt count. 5011 */ 5012 tp->t_rxtshift++; 5013 } 5014 if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { 5015 tp->t_rxtshift = TCP_MAXRXTSHIFT; 5016 KMOD_TCPSTAT_INC(tcps_timeoutdrop); 5017 retval = 1; 5018 tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN); 5019 tcp_set_inp_to_drop(bbr->rc_inp, 5020 (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT)); 5021 goto out; 5022 } 5023 if (tp->t_state == TCPS_SYN_SENT) { 5024 /* 5025 * If the SYN was retransmitted, indicate CWND to be limited 5026 * to 1 segment in cc_conn_init(). 5027 */ 5028 tp->snd_cwnd = 1; 5029 } else if (tp->t_rxtshift == 1) { 5030 /* 5031 * first retransmit; record ssthresh and cwnd so they can be 5032 * recovered if this turns out to be a "bad" retransmit. A 5033 * retransmit is considered "bad" if an ACK for this segment 5034 * is received within RTT/2 interval; the assumption here is 5035 * that the ACK was already in flight. See "On Estimating 5036 * End-to-End Network Path Properties" by Allman and Paxson 5037 * for more details. 5038 */ 5039 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5040 if (!IN_RECOVERY(tp->t_flags)) { 5041 tp->snd_cwnd_prev = tp->snd_cwnd; 5042 tp->snd_ssthresh_prev = tp->snd_ssthresh; 5043 tp->snd_recover_prev = tp->snd_recover; 5044 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1)); 5045 tp->t_flags |= TF_PREVVALID; 5046 } else { 5047 tp->t_flags &= ~TF_PREVVALID; 5048 } 5049 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5050 } else { 5051 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5052 tp->t_flags &= ~TF_PREVVALID; 5053 } 5054 KMOD_TCPSTAT_INC(tcps_rexmttimeo); 5055 if ((tp->t_state == TCPS_SYN_SENT) || 5056 (tp->t_state == TCPS_SYN_RECEIVED)) 5057 rexmt = USEC_2_TICKS(BBR_INITIAL_RTO) * tcp_backoff[tp->t_rxtshift]; 5058 else 5059 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; 5060 TCPT_RANGESET(tp->t_rxtcur, rexmt, 5061 MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), 5062 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 5063 /* 5064 * We enter the path for PLMTUD if connection is established or, if 5065 * connection is FIN_WAIT_1 status, reason for the last is that if 5066 * amount of data we send is very small, we could send it in couple 5067 * of packets and process straight to FIN. In that case we won't 5068 * catch ESTABLISHED state. 5069 */ 5070 #ifdef INET6 5071 isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) ? true : false; 5072 #else 5073 isipv6 = false; 5074 #endif 5075 if (((V_tcp_pmtud_blackhole_detect == 1) || 5076 (V_tcp_pmtud_blackhole_detect == 2 && !isipv6) || 5077 (V_tcp_pmtud_blackhole_detect == 3 && isipv6)) && 5078 ((tp->t_state == TCPS_ESTABLISHED) || 5079 (tp->t_state == TCPS_FIN_WAIT_1))) { 5080 /* 5081 * Idea here is that at each stage of mtu probe (usually, 5082 * 1448 -> 1188 -> 524) should be given 2 chances to recover 5083 * before further clamping down. 'tp->t_rxtshift % 2 == 0' 5084 * should take care of that. 5085 */ 5086 if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) == 5087 (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) && 5088 (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 && 5089 tp->t_rxtshift % 2 == 0)) { 5090 /* 5091 * Enter Path MTU Black-hole Detection mechanism: - 5092 * Disable Path MTU Discovery (IP "DF" bit). - 5093 * Reduce MTU to lower value than what we negotiated 5094 * with peer. 5095 */ 5096 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) { 5097 /* 5098 * Record that we may have found a black 5099 * hole. 5100 */ 5101 tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE; 5102 /* Keep track of previous MSS. */ 5103 tp->t_pmtud_saved_maxseg = tp->t_maxseg; 5104 } 5105 /* 5106 * Reduce the MSS to blackhole value or to the 5107 * default in an attempt to retransmit. 5108 */ 5109 #ifdef INET6 5110 isipv6 = bbr->r_is_v6; 5111 if (isipv6 && 5112 tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) { 5113 /* Use the sysctl tuneable blackhole MSS. */ 5114 tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss; 5115 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5116 } else if (isipv6) { 5117 /* Use the default MSS. */ 5118 tp->t_maxseg = V_tcp_v6mssdflt; 5119 /* 5120 * Disable Path MTU Discovery when we switch 5121 * to minmss. 5122 */ 5123 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5124 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5125 } 5126 #endif 5127 #if defined(INET6) && defined(INET) 5128 else 5129 #endif 5130 #ifdef INET 5131 if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) { 5132 /* Use the sysctl tuneable blackhole MSS. */ 5133 tp->t_maxseg = V_tcp_pmtud_blackhole_mss; 5134 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5135 } else { 5136 /* Use the default MSS. */ 5137 tp->t_maxseg = V_tcp_mssdflt; 5138 /* 5139 * Disable Path MTU Discovery when we switch 5140 * to minmss. 5141 */ 5142 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5143 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5144 } 5145 #endif 5146 } else { 5147 /* 5148 * If further retransmissions are still unsuccessful 5149 * with a lowered MTU, maybe this isn't a blackhole 5150 * and we restore the previous MSS and blackhole 5151 * detection flags. The limit '6' is determined by 5152 * giving each probe stage (1448, 1188, 524) 2 5153 * chances to recover. 5154 */ 5155 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) && 5156 (tp->t_rxtshift >= 6)) { 5157 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 5158 tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE; 5159 tp->t_maxseg = tp->t_pmtud_saved_maxseg; 5160 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_failed); 5161 } 5162 } 5163 } 5164 /* 5165 * Disable RFC1323 and SACK if we haven't got any response to our 5166 * third SYN to work-around some broken terminal servers (most of 5167 * which have hopefully been retired) that have bad VJ header 5168 * compression code which trashes TCP segments containing 5169 * unknown-to-them TCP options. 5170 */ 5171 if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && 5172 (tp->t_rxtshift == 3)) 5173 tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT); 5174 /* 5175 * If we backed off this far, our srtt estimate is probably bogus. 5176 * Clobber it so we'll take the next rtt measurement as our srtt; 5177 * move the current srtt into rttvar to keep the current retransmit 5178 * times until then. 5179 */ 5180 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) { 5181 #ifdef INET6 5182 if (bbr->r_is_v6) 5183 in6_losing(tp->t_inpcb); 5184 else 5185 #endif 5186 in_losing(tp->t_inpcb); 5187 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT); 5188 tp->t_srtt = 0; 5189 } 5190 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 5191 tp->snd_recover = tp->snd_max; 5192 tp->t_flags |= TF_ACKNOW; 5193 tp->t_rtttime = 0; 5194 out: 5195 return (retval); 5196 } 5197 5198 static int 5199 bbr_process_timers(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, uint8_t hpts_calling) 5200 { 5201 int32_t ret = 0; 5202 int32_t timers = (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK); 5203 5204 if (timers == 0) { 5205 return (0); 5206 } 5207 if (tp->t_state == TCPS_LISTEN) { 5208 /* no timers on listen sockets */ 5209 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) 5210 return (0); 5211 return (1); 5212 } 5213 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 5214 uint32_t left; 5215 5216 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) { 5217 ret = -1; 5218 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5219 return (0); 5220 } 5221 if (hpts_calling == 0) { 5222 ret = -2; 5223 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5224 return (0); 5225 } 5226 /* 5227 * Ok our timer went off early and we are not paced false 5228 * alarm, go back to sleep. 5229 */ 5230 left = bbr->r_ctl.rc_timer_exp - cts; 5231 ret = -3; 5232 bbr_log_to_processing(bbr, cts, ret, left, hpts_calling); 5233 tcp_hpts_insert(tp->t_inpcb, HPTS_USEC_TO_SLOTS(left)); 5234 return (1); 5235 } 5236 bbr->rc_tmr_stopped = 0; 5237 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK; 5238 if (timers & PACE_TMR_DELACK) { 5239 ret = bbr_timeout_delack(tp, bbr, cts); 5240 } else if (timers & PACE_TMR_PERSIT) { 5241 ret = bbr_timeout_persist(tp, bbr, cts); 5242 } else if (timers & PACE_TMR_RACK) { 5243 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5244 ret = bbr_timeout_rack(tp, bbr, cts); 5245 } else if (timers & PACE_TMR_TLP) { 5246 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5247 ret = bbr_timeout_tlp(tp, bbr, cts); 5248 } else if (timers & PACE_TMR_RXT) { 5249 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5250 ret = bbr_timeout_rxt(tp, bbr, cts); 5251 } else if (timers & PACE_TMR_KEEP) { 5252 ret = bbr_timeout_keepalive(tp, bbr, cts); 5253 } 5254 bbr_log_to_processing(bbr, cts, ret, timers, hpts_calling); 5255 return (ret); 5256 } 5257 5258 static void 5259 bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts) 5260 { 5261 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 5262 uint8_t hpts_removed = 0; 5263 5264 if (bbr->rc_inp->inp_in_hpts && 5265 (bbr->rc_timer_first == 1)) { 5266 /* 5267 * If we are canceling timer's when we have the 5268 * timer ahead of the output being paced. We also 5269 * must remove ourselves from the hpts. 5270 */ 5271 hpts_removed = 1; 5272 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 5273 if (bbr->r_ctl.rc_last_delay_val) { 5274 /* Update the last hptsi delay too */ 5275 uint32_t time_since_send; 5276 5277 if (TSTMP_GT(cts, bbr->rc_pacer_started)) 5278 time_since_send = cts - bbr->rc_pacer_started; 5279 else 5280 time_since_send = 0; 5281 if (bbr->r_ctl.rc_last_delay_val > time_since_send) { 5282 /* Cut down our slot time */ 5283 bbr->r_ctl.rc_last_delay_val -= time_since_send; 5284 } else { 5285 bbr->r_ctl.rc_last_delay_val = 0; 5286 } 5287 bbr->rc_pacer_started = cts; 5288 } 5289 } 5290 bbr->rc_timer_first = 0; 5291 bbr_log_to_cancel(bbr, line, cts, hpts_removed); 5292 bbr->rc_tmr_stopped = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; 5293 bbr->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK); 5294 } 5295 } 5296 5297 static void 5298 bbr_timer_stop(struct tcpcb *tp, uint32_t timer_type) 5299 { 5300 struct tcp_bbr *bbr; 5301 5302 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 5303 bbr->rc_all_timers_stopped = 1; 5304 return; 5305 } 5306 5307 /* 5308 * stop all timers always returning 0. 5309 */ 5310 static int 5311 bbr_stopall(struct tcpcb *tp) 5312 { 5313 return (0); 5314 } 5315 5316 static void 5317 bbr_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta) 5318 { 5319 return; 5320 } 5321 5322 /* 5323 * return true if a bbr timer (rack or tlp) is active. 5324 */ 5325 static int 5326 bbr_timer_active(struct tcpcb *tp, uint32_t timer_type) 5327 { 5328 return (0); 5329 } 5330 5331 static uint32_t 5332 bbr_get_earliest_send_outstanding(struct tcp_bbr *bbr, struct bbr_sendmap *u_rsm, uint32_t cts) 5333 { 5334 struct bbr_sendmap *rsm; 5335 5336 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 5337 if ((rsm == NULL) || (u_rsm == rsm)) 5338 return (cts); 5339 return(rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]); 5340 } 5341 5342 static void 5343 bbr_update_rsm(struct tcpcb *tp, struct tcp_bbr *bbr, 5344 struct bbr_sendmap *rsm, uint32_t cts, uint32_t pacing_time) 5345 { 5346 int32_t idx; 5347 5348 rsm->r_rtr_cnt++; 5349 rsm->r_dupack = 0; 5350 if (rsm->r_rtr_cnt > BBR_NUM_OF_RETRANS) { 5351 rsm->r_rtr_cnt = BBR_NUM_OF_RETRANS; 5352 rsm->r_flags |= BBR_OVERMAX; 5353 } 5354 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 5355 /* Take off the collapsed flag at rxt */ 5356 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 5357 } 5358 if (rsm->r_flags & BBR_MARKED_LOST) { 5359 /* We have retransmitted, its no longer lost */ 5360 rsm->r_flags &= ~BBR_MARKED_LOST; 5361 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 5362 } 5363 if (rsm->r_flags & BBR_RXT_CLEARED) { 5364 /* 5365 * We hit a RXT timer on it and 5366 * we cleared the "acked" flag. 5367 * We now have it going back into 5368 * flight, we can remove the cleared 5369 * flag and possibly do accounting on 5370 * this piece. 5371 */ 5372 rsm->r_flags &= ~BBR_RXT_CLEARED; 5373 } 5374 if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & BBR_TLP) == 0)) { 5375 bbr->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start); 5376 rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start); 5377 } 5378 idx = rsm->r_rtr_cnt - 1; 5379 rsm->r_tim_lastsent[idx] = cts; 5380 rsm->r_pacing_delay = pacing_time; 5381 rsm->r_delivered = bbr->r_ctl.rc_delivered; 5382 rsm->r_ts_valid = bbr->rc_ts_valid; 5383 if (bbr->rc_ts_valid) 5384 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 5385 if (bbr->r_ctl.r_app_limited_until) 5386 rsm->r_app_limited = 1; 5387 else 5388 rsm->r_app_limited = 0; 5389 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 5390 rsm->r_bbr_state = bbr_state_val(bbr); 5391 else 5392 rsm->r_bbr_state = 8; 5393 if (rsm->r_flags & BBR_ACKED) { 5394 /* Problably MTU discovery messing with us */ 5395 uint32_t old_flags; 5396 5397 old_flags = rsm->r_flags; 5398 rsm->r_flags &= ~BBR_ACKED; 5399 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 5400 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 5401 if (bbr->r_ctl.rc_sacked == 0) 5402 bbr->r_ctl.rc_sacklast = NULL; 5403 } 5404 if (rsm->r_in_tmap) { 5405 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5406 } 5407 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5408 rsm->r_in_tmap = 1; 5409 if (rsm->r_flags & BBR_SACK_PASSED) { 5410 /* We have retransmitted due to the SACK pass */ 5411 rsm->r_flags &= ~BBR_SACK_PASSED; 5412 rsm->r_flags |= BBR_WAS_SACKPASS; 5413 } 5414 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 5415 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 5416 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 5417 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 5418 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 5419 rsm->r_is_gain = 1; 5420 rsm->r_is_drain = 0; 5421 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 5422 rsm->r_is_drain = 1; 5423 rsm->r_is_gain = 0; 5424 } else { 5425 rsm->r_is_drain = 0; 5426 rsm->r_is_gain = 0; 5427 } 5428 rsm->r_del_time = bbr->r_ctl.rc_del_time; /* TEMP GOOGLE CODE */ 5429 } 5430 5431 /* 5432 * Returns 0, or the sequence where we stopped 5433 * updating. We also update the lenp to be the amount 5434 * of data left. 5435 */ 5436 5437 static uint32_t 5438 bbr_update_entry(struct tcpcb *tp, struct tcp_bbr *bbr, 5439 struct bbr_sendmap *rsm, uint32_t cts, int32_t *lenp, uint32_t pacing_time) 5440 { 5441 /* 5442 * We (re-)transmitted starting at rsm->r_start for some length 5443 * (possibly less than r_end. 5444 */ 5445 struct bbr_sendmap *nrsm; 5446 uint32_t c_end; 5447 int32_t len; 5448 5449 len = *lenp; 5450 c_end = rsm->r_start + len; 5451 if (SEQ_GEQ(c_end, rsm->r_end)) { 5452 /* 5453 * We retransmitted the whole piece or more than the whole 5454 * slopping into the next rsm. 5455 */ 5456 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5457 if (c_end == rsm->r_end) { 5458 *lenp = 0; 5459 return (0); 5460 } else { 5461 int32_t act_len; 5462 5463 /* Hangs over the end return whats left */ 5464 act_len = rsm->r_end - rsm->r_start; 5465 *lenp = (len - act_len); 5466 return (rsm->r_end); 5467 } 5468 /* We don't get out of this block. */ 5469 } 5470 /* 5471 * Here we retransmitted less than the whole thing which means we 5472 * have to split this into what was transmitted and what was not. 5473 */ 5474 nrsm = bbr_alloc_full_limit(bbr); 5475 if (nrsm == NULL) { 5476 *lenp = 0; 5477 return (0); 5478 } 5479 /* 5480 * So here we are going to take the original rsm and make it what we 5481 * retransmitted. nrsm will be the tail portion we did not 5482 * retransmit. For example say the chunk was 1, 11 (10 bytes). And 5483 * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to 5484 * 1, 6 and the new piece will be 6, 11. 5485 */ 5486 bbr_clone_rsm(bbr, nrsm, rsm, c_end); 5487 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 5488 nrsm->r_dupack = 0; 5489 if (rsm->r_in_tmap) { 5490 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 5491 nrsm->r_in_tmap = 1; 5492 } 5493 rsm->r_flags &= (~BBR_HAS_FIN); 5494 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5495 *lenp = 0; 5496 return (0); 5497 } 5498 5499 static uint64_t 5500 bbr_get_hardware_rate(struct tcp_bbr *bbr) 5501 { 5502 uint64_t bw; 5503 5504 bw = bbr_get_bw(bbr); 5505 bw *= (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]; 5506 bw /= (uint64_t)BBR_UNIT; 5507 return(bw); 5508 } 5509 5510 static void 5511 bbr_setup_less_of_rate(struct tcp_bbr *bbr, uint32_t cts, 5512 uint64_t act_rate, uint64_t rate_wanted) 5513 { 5514 /* 5515 * We could not get a full gains worth 5516 * of rate. 5517 */ 5518 if (get_filter_value(&bbr->r_ctl.rc_delrate) >= act_rate) { 5519 /* we can't even get the real rate */ 5520 uint64_t red; 5521 5522 bbr->skip_gain = 1; 5523 bbr->gain_is_limited = 0; 5524 red = get_filter_value(&bbr->r_ctl.rc_delrate) - act_rate; 5525 if (red) 5526 filter_reduce_by(&bbr->r_ctl.rc_delrate, red, cts); 5527 } else { 5528 /* We can use a lower gain */ 5529 bbr->skip_gain = 0; 5530 bbr->gain_is_limited = 1; 5531 } 5532 } 5533 5534 static void 5535 bbr_update_hardware_pacing_rate(struct tcp_bbr *bbr, uint32_t cts) 5536 { 5537 const struct tcp_hwrate_limit_table *nrte; 5538 int error, rate = -1; 5539 5540 if (bbr->r_ctl.crte == NULL) 5541 return; 5542 if ((bbr->rc_inp->inp_route.ro_nh == NULL) || 5543 (bbr->rc_inp->inp_route.ro_nh->nh_ifp == NULL)) { 5544 /* Lost our routes? */ 5545 /* Clear the way for a re-attempt */ 5546 bbr->bbr_attempt_hdwr_pace = 0; 5547 lost_rate: 5548 bbr->gain_is_limited = 0; 5549 bbr->skip_gain = 0; 5550 bbr->bbr_hdrw_pacing = 0; 5551 counter_u64_add(bbr_flows_whdwr_pacing, -1); 5552 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 5553 tcp_bbr_tso_size_check(bbr, cts); 5554 return; 5555 } 5556 rate = bbr_get_hardware_rate(bbr); 5557 nrte = tcp_chg_pacing_rate(bbr->r_ctl.crte, 5558 bbr->rc_tp, 5559 bbr->rc_inp->inp_route.ro_nh->nh_ifp, 5560 rate, 5561 (RS_PACING_GEQ|RS_PACING_SUB_OK), 5562 &error, NULL); 5563 if (nrte == NULL) { 5564 goto lost_rate; 5565 } 5566 if (nrte != bbr->r_ctl.crte) { 5567 bbr->r_ctl.crte = nrte; 5568 if (error == 0) { 5569 BBR_STAT_INC(bbr_hdwr_rl_mod_ok); 5570 if (bbr->r_ctl.crte->rate < rate) { 5571 /* We have a problem */ 5572 bbr_setup_less_of_rate(bbr, cts, 5573 bbr->r_ctl.crte->rate, rate); 5574 } else { 5575 /* We are good */ 5576 bbr->gain_is_limited = 0; 5577 bbr->skip_gain = 0; 5578 } 5579 } else { 5580 /* A failure should release the tag */ 5581 BBR_STAT_INC(bbr_hdwr_rl_mod_fail); 5582 bbr->gain_is_limited = 0; 5583 bbr->skip_gain = 0; 5584 bbr->bbr_hdrw_pacing = 0; 5585 } 5586 bbr_type_log_hdwr_pacing(bbr, 5587 bbr->r_ctl.crte->ptbl->rs_ifp, 5588 rate, 5589 ((bbr->r_ctl.crte == NULL) ? 0 : bbr->r_ctl.crte->rate), 5590 __LINE__, 5591 cts, 5592 error); 5593 } 5594 } 5595 5596 static void 5597 bbr_adjust_for_hw_pacing(struct tcp_bbr *bbr, uint32_t cts) 5598 { 5599 /* 5600 * If we have hardware pacing support 5601 * we need to factor that in for our 5602 * TSO size. 5603 */ 5604 const struct tcp_hwrate_limit_table *rlp; 5605 uint32_t cur_delay, seg_sz, maxseg, new_tso, delta, hdwr_delay; 5606 5607 if ((bbr->bbr_hdrw_pacing == 0) || 5608 (IN_RECOVERY(bbr->rc_tp->t_flags)) || 5609 (bbr->r_ctl.crte == NULL)) 5610 return; 5611 if (bbr->hw_pacing_set == 0) { 5612 /* Not yet by the hdwr pacing count delay */ 5613 return; 5614 } 5615 if (bbr_hdwr_pace_adjust == 0) { 5616 /* No adjustment */ 5617 return; 5618 } 5619 rlp = bbr->r_ctl.crte; 5620 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) 5621 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5622 else 5623 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5624 /* 5625 * So lets first get the 5626 * time we will take between 5627 * TSO sized sends currently without 5628 * hardware help. 5629 */ 5630 cur_delay = bbr_get_pacing_delay(bbr, BBR_UNIT, 5631 bbr->r_ctl.rc_pace_max_segs, cts, 1); 5632 hdwr_delay = bbr->r_ctl.rc_pace_max_segs / maxseg; 5633 hdwr_delay *= rlp->time_between; 5634 if (cur_delay > hdwr_delay) 5635 delta = cur_delay - hdwr_delay; 5636 else 5637 delta = 0; 5638 bbr_log_type_tsosize(bbr, cts, delta, cur_delay, hdwr_delay, 5639 (bbr->r_ctl.rc_pace_max_segs / maxseg), 5640 1); 5641 if (delta && 5642 (delta < (max(rlp->time_between, 5643 bbr->r_ctl.bbr_hptsi_segments_delay_tar)))) { 5644 /* 5645 * Now lets divide by the pacing 5646 * time between each segment the 5647 * hardware sends rounding up and 5648 * derive a bytes from that. We multiply 5649 * that by bbr_hdwr_pace_adjust to get 5650 * more bang for our buck. 5651 * 5652 * The goal is to have the software pacer 5653 * waiting no more than an additional 5654 * pacing delay if we can (without the 5655 * compensation i.e. x bbr_hdwr_pace_adjust). 5656 */ 5657 seg_sz = max(((cur_delay + rlp->time_between)/rlp->time_between), 5658 (bbr->r_ctl.rc_pace_max_segs/maxseg)); 5659 seg_sz *= bbr_hdwr_pace_adjust; 5660 if (bbr_hdwr_pace_floor && 5661 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5662 /* Currently hardware paces 5663 * out rs_min_seg segments at a time. 5664 * We need to make sure we always send at least 5665 * a full burst of bbr_hdwr_pace_floor down. 5666 */ 5667 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5668 } 5669 seg_sz *= maxseg; 5670 } else if (delta == 0) { 5671 /* 5672 * The highest pacing rate is 5673 * above our b/w gained. This means 5674 * we probably are going quite fast at 5675 * the hardware highest rate. Lets just multiply 5676 * the calculated TSO size by the 5677 * multiplier factor (its probably 5678 * 4 segments in the default config for 5679 * mlx). 5680 */ 5681 seg_sz = bbr->r_ctl.rc_pace_max_segs * bbr_hdwr_pace_adjust; 5682 if (bbr_hdwr_pace_floor && 5683 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5684 /* Currently hardware paces 5685 * out rs_min_seg segments at a time. 5686 * We need to make sure we always send at least 5687 * a full burst of bbr_hdwr_pace_floor down. 5688 */ 5689 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5690 } 5691 } else { 5692 /* 5693 * The pacing time difference is so 5694 * big that the hardware will 5695 * pace out more rapidly then we 5696 * really want and then we 5697 * will have a long delay. Lets just keep 5698 * the same TSO size so its as if 5699 * we were not using hdwr pacing (we 5700 * just gain a bit of spacing from the 5701 * hardware if seg_sz > 1). 5702 */ 5703 seg_sz = bbr->r_ctl.rc_pace_max_segs; 5704 } 5705 if (seg_sz > bbr->r_ctl.rc_pace_max_segs) 5706 new_tso = seg_sz; 5707 else 5708 new_tso = bbr->r_ctl.rc_pace_max_segs; 5709 if (new_tso >= (PACE_MAX_IP_BYTES-maxseg)) 5710 new_tso = PACE_MAX_IP_BYTES - maxseg; 5711 5712 if (new_tso != bbr->r_ctl.rc_pace_max_segs) { 5713 bbr_log_type_tsosize(bbr, cts, new_tso, 0, bbr->r_ctl.rc_pace_max_segs, maxseg, 0); 5714 bbr->r_ctl.rc_pace_max_segs = new_tso; 5715 } 5716 } 5717 5718 static void 5719 tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts) 5720 { 5721 uint64_t bw; 5722 uint32_t old_tso = 0, new_tso; 5723 uint32_t maxseg, bytes; 5724 uint32_t tls_seg=0; 5725 /* 5726 * Google/linux uses the following algorithm to determine 5727 * the TSO size based on the b/w of the link (from Neal Cardwell email 9/27/18): 5728 * 5729 * bytes = bw_in_bytes_per_second / 1000 5730 * bytes = min(bytes, 64k) 5731 * tso_segs = bytes / MSS 5732 * if (bw < 1.2Mbs) 5733 * min_tso_segs = 1 5734 * else 5735 * min_tso_segs = 2 5736 * tso_segs = max(tso_segs, min_tso_segs) 5737 * 5738 * * Note apply a device specific limit (we apply this in the 5739 * tcp_m_copym). 5740 * Note that before the initial measurement is made google bursts out 5741 * a full iwnd just like new-reno/cubic. 5742 * 5743 * We do not use this algorithm. Instead we 5744 * use a two phased approach: 5745 * 5746 * if ( bw <= per-tcb-cross-over) 5747 * goal_tso = calculate how much with this bw we 5748 * can send in goal-time seconds. 5749 * if (goal_tso > mss) 5750 * seg = goal_tso / mss 5751 * tso = seg * mss 5752 * else 5753 * tso = mss 5754 * if (tso > per-tcb-max) 5755 * tso = per-tcb-max 5756 * else if ( bw > 512Mbps) 5757 * tso = max-tso (64k/mss) 5758 * else 5759 * goal_tso = bw / per-tcb-divsor 5760 * seg = (goal_tso + mss-1)/mss 5761 * tso = seg * mss 5762 * 5763 * if (tso < per-tcb-floor) 5764 * tso = per-tcb-floor 5765 * if (tso > per-tcb-utter_max) 5766 * tso = per-tcb-utter_max 5767 * 5768 * Note the default per-tcb-divisor is 1000 (same as google). 5769 * the goal cross over is 30Mbps however. To recreate googles 5770 * algorithm you need to set: 5771 * 5772 * cross-over = 23,168,000 bps 5773 * goal-time = 18000 5774 * per-tcb-max = 2 5775 * per-tcb-divisor = 1000 5776 * per-tcb-floor = 1 5777 * 5778 * This will get you "google bbr" behavior with respect to tso size. 5779 * 5780 * Note we do set anything TSO size until we are past the initial 5781 * window. Before that we gnerally use either a single MSS 5782 * or we use the full IW size (so we burst a IW at a time) 5783 */ 5784 5785 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) { 5786 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5787 } else { 5788 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5789 } 5790 old_tso = bbr->r_ctl.rc_pace_max_segs; 5791 if (bbr->rc_past_init_win == 0) { 5792 /* 5793 * Not enough data has been acknowledged to make a 5794 * judgement. Set up the initial TSO based on if we 5795 * are sending a full IW at once or not. 5796 */ 5797 if (bbr->rc_use_google) 5798 bbr->r_ctl.rc_pace_max_segs = ((bbr->rc_tp->t_maxseg - bbr->rc_last_options) * 2); 5799 else if (bbr->bbr_init_win_cheat) 5800 bbr->r_ctl.rc_pace_max_segs = bbr_initial_cwnd(bbr, bbr->rc_tp); 5801 else 5802 bbr->r_ctl.rc_pace_max_segs = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5803 if (bbr->r_ctl.rc_pace_min_segs != bbr->rc_tp->t_maxseg) 5804 bbr->r_ctl.rc_pace_min_segs = bbr->rc_tp->t_maxseg; 5805 if (bbr->r_ctl.rc_pace_max_segs == 0) { 5806 bbr->r_ctl.rc_pace_max_segs = maxseg; 5807 } 5808 bbr_log_type_tsosize(bbr, cts, bbr->r_ctl.rc_pace_max_segs, tls_seg, old_tso, maxseg, 0); 5809 bbr_adjust_for_hw_pacing(bbr, cts); 5810 return; 5811 } 5812 /** 5813 * Now lets set the TSO goal based on our delivery rate in 5814 * bytes per second. Note we only do this if 5815 * we have acked at least the initial cwnd worth of data. 5816 */ 5817 bw = bbr_get_bw(bbr); 5818 if (IN_RECOVERY(bbr->rc_tp->t_flags) && 5819 (bbr->rc_use_google == 0)) { 5820 /* We clamp to one MSS in recovery */ 5821 new_tso = maxseg; 5822 } else if (bbr->rc_use_google) { 5823 int min_tso_segs; 5824 5825 /* Google considers the gain too */ 5826 if (bbr->r_ctl.rc_bbr_hptsi_gain != BBR_UNIT) { 5827 bw *= bbr->r_ctl.rc_bbr_hptsi_gain; 5828 bw /= BBR_UNIT; 5829 } 5830 bytes = bw / 1024; 5831 if (bytes > (64 * 1024)) 5832 bytes = 64 * 1024; 5833 new_tso = bytes / maxseg; 5834 if (bw < ONE_POINT_TWO_MEG) 5835 min_tso_segs = 1; 5836 else 5837 min_tso_segs = 2; 5838 if (new_tso < min_tso_segs) 5839 new_tso = min_tso_segs; 5840 new_tso *= maxseg; 5841 } else if (bbr->rc_no_pacing) { 5842 new_tso = (PACE_MAX_IP_BYTES / maxseg) * maxseg; 5843 } else if (bw <= bbr->r_ctl.bbr_cross_over) { 5844 /* 5845 * Calculate the worse case b/w TSO if we are inserting no 5846 * more than a delay_target number of TSO's. 5847 */ 5848 uint32_t tso_len, min_tso; 5849 5850 tso_len = bbr_get_pacing_length(bbr, BBR_UNIT, bbr->r_ctl.bbr_hptsi_segments_delay_tar, bw); 5851 if (tso_len > maxseg) { 5852 new_tso = tso_len / maxseg; 5853 if (new_tso > bbr->r_ctl.bbr_hptsi_segments_max) 5854 new_tso = bbr->r_ctl.bbr_hptsi_segments_max; 5855 new_tso *= maxseg; 5856 } else { 5857 /* 5858 * less than a full sized frame yikes.. long rtt or 5859 * low bw? 5860 */ 5861 min_tso = bbr_minseg(bbr); 5862 if ((tso_len > min_tso) && (bbr_all_get_min == 0)) 5863 new_tso = rounddown(tso_len, min_tso); 5864 else 5865 new_tso = min_tso; 5866 } 5867 } else if (bw > FIVETWELVE_MBPS) { 5868 /* 5869 * This guy is so fast b/w wise that we can TSO as large as 5870 * possible of segments that the NIC will allow. 5871 */ 5872 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5873 } else { 5874 /* 5875 * This formula is based on attempting to send a segment or 5876 * more every bbr_hptsi_per_second. The default is 1000 5877 * which means you are targeting what you can send every 1ms 5878 * based on the peers bw. 5879 * 5880 * If the number drops to say 500, then you are looking more 5881 * at 2ms and you will raise how much we send in a single 5882 * TSO thus saving CPU (less bbr_output_wtime() calls). The 5883 * trade off of course is you will send more at once and 5884 * thus tend to clump up the sends into larger "bursts" 5885 * building a queue. 5886 */ 5887 bw /= bbr->r_ctl.bbr_hptsi_per_second; 5888 new_tso = roundup(bw, (uint64_t)maxseg); 5889 /* 5890 * Gate the floor to match what our lower than 48Mbps 5891 * algorithm does. The ceiling (bbr_hptsi_segments_max) thus 5892 * becomes the floor for this calculation. 5893 */ 5894 if (new_tso < (bbr->r_ctl.bbr_hptsi_segments_max * maxseg)) 5895 new_tso = (bbr->r_ctl.bbr_hptsi_segments_max * maxseg); 5896 } 5897 if (bbr->r_ctl.bbr_hptsi_segments_floor && (new_tso < (maxseg * bbr->r_ctl.bbr_hptsi_segments_floor))) 5898 new_tso = maxseg * bbr->r_ctl.bbr_hptsi_segments_floor; 5899 if (new_tso > PACE_MAX_IP_BYTES) 5900 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5901 /* Enforce an utter maximum. */ 5902 if (bbr->r_ctl.bbr_utter_max && (new_tso > (bbr->r_ctl.bbr_utter_max * maxseg))) { 5903 new_tso = bbr->r_ctl.bbr_utter_max * maxseg; 5904 } 5905 if (old_tso != new_tso) { 5906 /* Only log changes */ 5907 bbr_log_type_tsosize(bbr, cts, new_tso, tls_seg, old_tso, maxseg, 0); 5908 bbr->r_ctl.rc_pace_max_segs = new_tso; 5909 } 5910 /* We have hardware pacing! */ 5911 bbr_adjust_for_hw_pacing(bbr, cts); 5912 } 5913 5914 static void 5915 bbr_log_output(struct tcp_bbr *bbr, struct tcpcb *tp, struct tcpopt *to, int32_t len, 5916 uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t cts, 5917 struct mbuf *mb, int32_t * abandon, struct bbr_sendmap *hintrsm, uint32_t delay_calc, 5918 struct sockbuf *sb) 5919 { 5920 5921 struct bbr_sendmap *rsm, *nrsm; 5922 register uint32_t snd_max, snd_una; 5923 uint32_t pacing_time; 5924 /* 5925 * Add to the RACK log of packets in flight or retransmitted. If 5926 * there is a TS option we will use the TS echoed, if not we will 5927 * grab a TS. 5928 * 5929 * Retransmissions will increment the count and move the ts to its 5930 * proper place. Note that if options do not include TS's then we 5931 * won't be able to effectively use the ACK for an RTT on a retran. 5932 * 5933 * Notes about r_start and r_end. Lets consider a send starting at 5934 * sequence 1 for 10 bytes. In such an example the r_start would be 5935 * 1 (starting sequence) but the r_end would be r_start+len i.e. 11. 5936 * This means that r_end is actually the first sequence for the next 5937 * slot (11). 5938 * 5939 */ 5940 INP_WLOCK_ASSERT(tp->t_inpcb); 5941 if (err) { 5942 /* 5943 * We don't log errors -- we could but snd_max does not 5944 * advance in this case either. 5945 */ 5946 return; 5947 } 5948 if (th_flags & TH_RST) { 5949 /* 5950 * We don't log resets and we return immediately from 5951 * sending 5952 */ 5953 *abandon = 1; 5954 return; 5955 } 5956 snd_una = tp->snd_una; 5957 if (th_flags & (TH_SYN | TH_FIN) && (hintrsm == NULL)) { 5958 /* 5959 * The call to bbr_log_output is made before bumping 5960 * snd_max. This means we can record one extra byte on a SYN 5961 * or FIN if seq_out is adding more on and a FIN is present 5962 * (and we are not resending). 5963 */ 5964 if ((th_flags & TH_SYN) && (tp->iss == seq_out)) 5965 len++; 5966 if (th_flags & TH_FIN) 5967 len++; 5968 } 5969 if (SEQ_LEQ((seq_out + len), snd_una)) { 5970 /* Are sending an old segment to induce an ack (keep-alive)? */ 5971 return; 5972 } 5973 if (SEQ_LT(seq_out, snd_una)) { 5974 /* huh? should we panic? */ 5975 uint32_t end; 5976 5977 end = seq_out + len; 5978 seq_out = snd_una; 5979 len = end - seq_out; 5980 } 5981 snd_max = tp->snd_max; 5982 if (len == 0) { 5983 /* We don't log zero window probes */ 5984 return; 5985 } 5986 pacing_time = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, len, cts, 1); 5987 /* First question is it a retransmission? */ 5988 if (seq_out == snd_max) { 5989 again: 5990 rsm = bbr_alloc(bbr); 5991 if (rsm == NULL) { 5992 return; 5993 } 5994 rsm->r_flags = 0; 5995 if (th_flags & TH_SYN) 5996 rsm->r_flags |= BBR_HAS_SYN; 5997 if (th_flags & TH_FIN) 5998 rsm->r_flags |= BBR_HAS_FIN; 5999 rsm->r_tim_lastsent[0] = cts; 6000 rsm->r_rtr_cnt = 1; 6001 rsm->r_rtr_bytes = 0; 6002 rsm->r_start = seq_out; 6003 rsm->r_end = rsm->r_start + len; 6004 rsm->r_dupack = 0; 6005 rsm->r_delivered = bbr->r_ctl.rc_delivered; 6006 rsm->r_pacing_delay = pacing_time; 6007 rsm->r_ts_valid = bbr->rc_ts_valid; 6008 if (bbr->rc_ts_valid) 6009 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 6010 rsm->r_del_time = bbr->r_ctl.rc_del_time; 6011 if (bbr->r_ctl.r_app_limited_until) 6012 rsm->r_app_limited = 1; 6013 else 6014 rsm->r_app_limited = 0; 6015 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 6016 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 6017 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 6018 /* 6019 * Here we must also add in this rsm since snd_max 6020 * is updated after we return from a new send. 6021 */ 6022 rsm->r_flight_at_send += len; 6023 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 6024 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 6025 rsm->r_in_tmap = 1; 6026 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 6027 rsm->r_bbr_state = bbr_state_val(bbr); 6028 else 6029 rsm->r_bbr_state = 8; 6030 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 6031 rsm->r_is_gain = 1; 6032 rsm->r_is_drain = 0; 6033 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 6034 rsm->r_is_drain = 1; 6035 rsm->r_is_gain = 0; 6036 } else { 6037 rsm->r_is_drain = 0; 6038 rsm->r_is_gain = 0; 6039 } 6040 return; 6041 } 6042 /* 6043 * If we reach here its a retransmission and we need to find it. 6044 */ 6045 more: 6046 if (hintrsm && (hintrsm->r_start == seq_out)) { 6047 rsm = hintrsm; 6048 hintrsm = NULL; 6049 } else if (bbr->r_ctl.rc_next) { 6050 /* We have a hint from a previous run */ 6051 rsm = bbr->r_ctl.rc_next; 6052 } else { 6053 /* No hints sorry */ 6054 rsm = NULL; 6055 } 6056 if ((rsm) && (rsm->r_start == seq_out)) { 6057 /* 6058 * We used rc_next or hintrsm to retransmit, hopefully the 6059 * likely case. 6060 */ 6061 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6062 if (len == 0) { 6063 return; 6064 } else { 6065 goto more; 6066 } 6067 } 6068 /* Ok it was not the last pointer go through it the hard way. */ 6069 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6070 if (rsm->r_start == seq_out) { 6071 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6072 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 6073 if (len == 0) { 6074 return; 6075 } else { 6076 continue; 6077 } 6078 } 6079 if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) { 6080 /* Transmitted within this piece */ 6081 /* 6082 * Ok we must split off the front and then let the 6083 * update do the rest 6084 */ 6085 nrsm = bbr_alloc_full_limit(bbr); 6086 if (nrsm == NULL) { 6087 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 6088 return; 6089 } 6090 /* 6091 * copy rsm to nrsm and then trim the front of rsm 6092 * to not include this part. 6093 */ 6094 bbr_clone_rsm(bbr, nrsm, rsm, seq_out); 6095 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 6096 if (rsm->r_in_tmap) { 6097 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 6098 nrsm->r_in_tmap = 1; 6099 } 6100 rsm->r_flags &= (~BBR_HAS_FIN); 6101 seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time); 6102 if (len == 0) { 6103 return; 6104 } 6105 } 6106 } 6107 /* 6108 * Hmm not found in map did they retransmit both old and on into the 6109 * new? 6110 */ 6111 if (seq_out == tp->snd_max) { 6112 goto again; 6113 } else if (SEQ_LT(seq_out, tp->snd_max)) { 6114 #ifdef BBR_INVARIANTS 6115 printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n", 6116 seq_out, len, tp->snd_una, tp->snd_max); 6117 printf("Starting Dump of all rack entries\n"); 6118 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6119 printf("rsm:%p start:%u end:%u\n", 6120 rsm, rsm->r_start, rsm->r_end); 6121 } 6122 printf("Dump complete\n"); 6123 panic("seq_out not found rack:%p tp:%p", 6124 bbr, tp); 6125 #endif 6126 } else { 6127 #ifdef BBR_INVARIANTS 6128 /* 6129 * Hmm beyond sndmax? (only if we are using the new rtt-pack 6130 * flag) 6131 */ 6132 panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p", 6133 seq_out, len, tp->snd_max, tp); 6134 #endif 6135 } 6136 } 6137 6138 static void 6139 bbr_collapse_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, int32_t rtt) 6140 { 6141 /* 6142 * Collapse timeout back the cum-ack moved. 6143 */ 6144 tp->t_rxtshift = 0; 6145 tp->t_softerror = 0; 6146 } 6147 6148 static void 6149 tcp_bbr_xmit_timer(struct tcp_bbr *bbr, uint32_t rtt_usecs, uint32_t rsm_send_time, uint32_t r_start, uint32_t tsin) 6150 { 6151 bbr->rtt_valid = 1; 6152 bbr->r_ctl.cur_rtt = rtt_usecs; 6153 bbr->r_ctl.ts_in = tsin; 6154 if (rsm_send_time) 6155 bbr->r_ctl.cur_rtt_send_time = rsm_send_time; 6156 } 6157 6158 static void 6159 bbr_make_timestamp_determination(struct tcp_bbr *bbr) 6160 { 6161 /** 6162 * We have in our bbr control: 6163 * 1) The timestamp we started observing cum-acks (bbr->r_ctl.bbr_ts_check_tstmp). 6164 * 2) Our timestamp indicating when we sent that packet (bbr->r_ctl.rsm->bbr_ts_check_our_cts). 6165 * 3) The current timestamp that just came in (bbr->r_ctl.last_inbound_ts) 6166 * 4) The time that the packet that generated that ack was sent (bbr->r_ctl.cur_rtt_send_time) 6167 * 6168 * Now we can calculate the time between the sends by doing: 6169 * 6170 * delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts 6171 * 6172 * And the peer's time between receiving them by doing: 6173 * 6174 * peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp 6175 * 6176 * We want to figure out if the timestamp values are in msec, 10msec or usec. 6177 * We also may find that we can't use the timestamps if say we see 6178 * that the peer_delta indicates that though we may have taken 10ms to 6179 * pace out the data, it only saw 1ms between the two packets. This would 6180 * indicate that somewhere on the path is a batching entity that is giving 6181 * out time-slices of the actual b/w. This would mean we could not use 6182 * reliably the peers timestamps. 6183 * 6184 * We expect delta > peer_delta initially. Until we figure out the 6185 * timestamp difference which we will store in bbr->r_ctl.bbr_peer_tsratio. 6186 * If we place 1000 there then its a ms vs our usec. If we place 10000 there 6187 * then its 10ms vs our usec. If the peer is running a usec clock we would 6188 * put a 1 there. If the value is faster then ours, we will disable the 6189 * use of timestamps (though we could revist this later if we find it to be not 6190 * just an isolated one or two flows)). 6191 * 6192 * To detect the batching middle boxes we will come up with our compensation and 6193 * if with it in place, we find the peer is drastically off (by some margin) in 6194 * the smaller direction, then we will assume the worst case and disable use of timestamps. 6195 * 6196 */ 6197 uint64_t delta, peer_delta, delta_up; 6198 6199 delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts; 6200 if (delta < bbr_min_usec_delta) { 6201 /* 6202 * Have not seen a min amount of time 6203 * between our send times so we can 6204 * make a determination of the timestamp 6205 * yet. 6206 */ 6207 return; 6208 } 6209 peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp; 6210 if (peer_delta < bbr_min_peer_delta) { 6211 /* 6212 * We may have enough in the form of 6213 * our delta but the peers number 6214 * has not changed that much. It could 6215 * be its clock ratio is such that 6216 * we need more data (10ms tick) or 6217 * there may be other compression scenarios 6218 * going on. In any event we need the 6219 * spread to be larger. 6220 */ 6221 return; 6222 } 6223 /* Ok lets first see which way our delta is going */ 6224 if (peer_delta > delta) { 6225 /* Very unlikely, the peer without 6226 * compensation shows that it saw 6227 * the two sends arrive further apart 6228 * then we saw then in micro-seconds. 6229 */ 6230 if (peer_delta < (delta + ((delta * (uint64_t)1000)/ (uint64_t)bbr_delta_percent))) { 6231 /* well it looks like the peer is a micro-second clock. */ 6232 bbr->rc_ts_clock_set = 1; 6233 bbr->r_ctl.bbr_peer_tsratio = 1; 6234 } else { 6235 bbr->rc_ts_cant_be_used = 1; 6236 bbr->rc_ts_clock_set = 1; 6237 } 6238 return; 6239 } 6240 /* Ok we know that the peer_delta is smaller than our send distance */ 6241 bbr->rc_ts_clock_set = 1; 6242 /* First question is it within the percentage that they are using usec time? */ 6243 delta_up = (peer_delta * 1000) / (uint64_t)bbr_delta_percent; 6244 if ((peer_delta + delta_up) >= delta) { 6245 /* Its a usec clock */ 6246 bbr->r_ctl.bbr_peer_tsratio = 1; 6247 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6248 return; 6249 } 6250 /* Ok if not usec, what about 10usec (though unlikely)? */ 6251 delta_up = (peer_delta * 1000 * 10) / (uint64_t)bbr_delta_percent; 6252 if (((peer_delta * 10) + delta_up) >= delta) { 6253 bbr->r_ctl.bbr_peer_tsratio = 10; 6254 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6255 return; 6256 } 6257 /* And what about 100usec (though again unlikely)? */ 6258 delta_up = (peer_delta * 1000 * 100) / (uint64_t)bbr_delta_percent; 6259 if (((peer_delta * 100) + delta_up) >= delta) { 6260 bbr->r_ctl.bbr_peer_tsratio = 100; 6261 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6262 return; 6263 } 6264 /* And how about 1 msec (the most likely one)? */ 6265 delta_up = (peer_delta * 1000 * 1000) / (uint64_t)bbr_delta_percent; 6266 if (((peer_delta * 1000) + delta_up) >= delta) { 6267 bbr->r_ctl.bbr_peer_tsratio = 1000; 6268 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6269 return; 6270 } 6271 /* Ok if not msec could it be 10 msec? */ 6272 delta_up = (peer_delta * 1000 * 10000) / (uint64_t)bbr_delta_percent; 6273 if (((peer_delta * 10000) + delta_up) >= delta) { 6274 bbr->r_ctl.bbr_peer_tsratio = 10000; 6275 return; 6276 } 6277 /* If we fall down here the clock tick so slowly we can't use it */ 6278 bbr->rc_ts_cant_be_used = 1; 6279 bbr->r_ctl.bbr_peer_tsratio = 0; 6280 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6281 } 6282 6283 /* 6284 * Collect new round-trip time estimate 6285 * and update averages and current timeout. 6286 */ 6287 static void 6288 tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts) 6289 { 6290 int32_t delta; 6291 uint32_t rtt, tsin; 6292 int32_t rtt_ticks; 6293 6294 if (bbr->rtt_valid == 0) 6295 /* No valid sample */ 6296 return; 6297 6298 rtt = bbr->r_ctl.cur_rtt; 6299 tsin = bbr->r_ctl.ts_in; 6300 if (bbr->rc_prtt_set_ts) { 6301 /* 6302 * We are to force feed the rttProp filter due 6303 * to an entry into PROBE_RTT. This assures 6304 * that the times are sync'd between when we 6305 * go into PROBE_RTT and the filter expiration. 6306 * 6307 * Google does not use a true filter, so they do 6308 * this implicitly since they only keep one value 6309 * and when they enter probe-rtt they update the 6310 * value to the newest rtt. 6311 */ 6312 uint32_t rtt_prop; 6313 6314 bbr->rc_prtt_set_ts = 0; 6315 rtt_prop = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 6316 if (rtt > rtt_prop) 6317 filter_increase_by_small(&bbr->r_ctl.rc_rttprop, (rtt - rtt_prop), cts); 6318 else 6319 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6320 } 6321 if (bbr->rc_ack_was_delayed) 6322 rtt += bbr->r_ctl.rc_ack_hdwr_delay; 6323 6324 if (rtt < bbr->r_ctl.rc_lowest_rtt) 6325 bbr->r_ctl.rc_lowest_rtt = rtt; 6326 bbr_log_rtt_sample(bbr, rtt, tsin); 6327 if (bbr->r_init_rtt) { 6328 /* 6329 * The initial rtt is not-trusted, nuke it and lets get 6330 * our first valid measurement in. 6331 */ 6332 bbr->r_init_rtt = 0; 6333 tp->t_srtt = 0; 6334 } 6335 if ((bbr->rc_ts_clock_set == 0) && bbr->rc_ts_valid) { 6336 /* 6337 * So we have not yet figured out 6338 * what the peers TSTMP value is 6339 * in (most likely ms). We need a 6340 * series of cum-ack's to determine 6341 * this reliably. 6342 */ 6343 if (bbr->rc_ack_is_cumack) { 6344 if (bbr->rc_ts_data_set) { 6345 /* Lets attempt to determine the timestamp granularity. */ 6346 bbr_make_timestamp_determination(bbr); 6347 } else { 6348 bbr->rc_ts_data_set = 1; 6349 bbr->r_ctl.bbr_ts_check_tstmp = bbr->r_ctl.last_inbound_ts; 6350 bbr->r_ctl.bbr_ts_check_our_cts = bbr->r_ctl.cur_rtt_send_time; 6351 } 6352 } else { 6353 /* 6354 * We have to have consecutive acks 6355 * reset any "filled" state to none. 6356 */ 6357 bbr->rc_ts_data_set = 0; 6358 } 6359 } 6360 /* Round it up */ 6361 rtt_ticks = USEC_2_TICKS((rtt + (USECS_IN_MSEC - 1))); 6362 if (rtt_ticks == 0) 6363 rtt_ticks = 1; 6364 if (tp->t_srtt != 0) { 6365 /* 6366 * srtt is stored as fixed point with 5 bits after the 6367 * binary point (i.e., scaled by 8). The following magic is 6368 * equivalent to the smoothing algorithm in rfc793 with an 6369 * alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed point). 6370 * Adjust rtt to origin 0. 6371 */ 6372 6373 delta = ((rtt_ticks - 1) << TCP_DELTA_SHIFT) 6374 - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)); 6375 6376 tp->t_srtt += delta; 6377 if (tp->t_srtt <= 0) 6378 tp->t_srtt = 1; 6379 6380 /* 6381 * We accumulate a smoothed rtt variance (actually, a 6382 * smoothed mean difference), then set the retransmit timer 6383 * to smoothed rtt + 4 times the smoothed variance. rttvar 6384 * is stored as fixed point with 4 bits after the binary 6385 * point (scaled by 16). The following is equivalent to 6386 * rfc793 smoothing with an alpha of .75 (rttvar = 6387 * rttvar*3/4 + |delta| / 4). This replaces rfc793's 6388 * wired-in beta. 6389 */ 6390 if (delta < 0) 6391 delta = -delta; 6392 delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT); 6393 tp->t_rttvar += delta; 6394 if (tp->t_rttvar <= 0) 6395 tp->t_rttvar = 1; 6396 if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar) 6397 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6398 } else { 6399 /* 6400 * No rtt measurement yet - use the unsmoothed rtt. Set the 6401 * variance to half the rtt (so our first retransmit happens 6402 * at 3*rtt). 6403 */ 6404 tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT; 6405 tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1); 6406 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6407 } 6408 KMOD_TCPSTAT_INC(tcps_rttupdated); 6409 tp->t_rttupdated++; 6410 #ifdef STATS 6411 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt_ticks)); 6412 #endif 6413 /* 6414 * the retransmit should happen at rtt + 4 * rttvar. Because of the 6415 * way we do the smoothing, srtt and rttvar will each average +1/2 6416 * tick of bias. When we compute the retransmit timer, we want 1/2 6417 * tick of rounding and 1 extra tick because of +-1/2 tick 6418 * uncertainty in the firing of the timer. The bias will give us 6419 * exactly the 1.5 tick we need. But, because the bias is 6420 * statistical, we have to test that we don't drop below the minimum 6421 * feasible timer (which is 2 ticks). 6422 */ 6423 TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), 6424 max(MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), rtt_ticks + 2), 6425 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 6426 6427 /* 6428 * We received an ack for a packet that wasn't retransmitted; it is 6429 * probably safe to discard any error indications we've received 6430 * recently. This isn't quite right, but close enough for now (a 6431 * route might have failed after we sent a segment, and the return 6432 * path might not be symmetrical). 6433 */ 6434 tp->t_softerror = 0; 6435 rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 6436 if (bbr->r_ctl.bbr_smallest_srtt_this_state > rtt) 6437 bbr->r_ctl.bbr_smallest_srtt_this_state = rtt; 6438 } 6439 6440 static void 6441 bbr_set_reduced_rtt(struct tcp_bbr *bbr, uint32_t cts, uint32_t line) 6442 { 6443 bbr->r_ctl.rc_rtt_shrinks = cts; 6444 if (bbr_can_force_probertt && 6445 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 6446 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 6447 /* 6448 * We should enter probe-rtt its been too long 6449 * since we have been there. 6450 */ 6451 bbr_enter_probe_rtt(bbr, cts, __LINE__); 6452 } else 6453 bbr_check_probe_rtt_limits(bbr, cts); 6454 } 6455 6456 static void 6457 tcp_bbr_commit_bw(struct tcp_bbr *bbr, uint32_t cts) 6458 { 6459 uint64_t orig_bw; 6460 6461 if (bbr->r_ctl.rc_bbr_cur_del_rate == 0) { 6462 /* We never apply a zero measurment */ 6463 bbr_log_type_bbrupd(bbr, 20, cts, 0, 0, 6464 0, 0, 0, 0, 0, 0); 6465 return; 6466 } 6467 if (bbr->r_ctl.r_measurement_count < 0xffffffff) 6468 bbr->r_ctl.r_measurement_count++; 6469 orig_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 6470 apply_filter_max(&bbr->r_ctl.rc_delrate, bbr->r_ctl.rc_bbr_cur_del_rate, bbr->r_ctl.rc_pkt_epoch); 6471 bbr_log_type_bbrupd(bbr, 21, cts, (uint32_t)orig_bw, 6472 (uint32_t)get_filter_value(&bbr->r_ctl.rc_delrate), 6473 0, 0, 0, 0, 0, 0); 6474 if (orig_bw && 6475 (orig_bw != get_filter_value(&bbr->r_ctl.rc_delrate))) { 6476 if (bbr->bbr_hdrw_pacing) { 6477 /* 6478 * Apply a new rate to the hardware 6479 * possibly. 6480 */ 6481 bbr_update_hardware_pacing_rate(bbr, cts); 6482 } 6483 bbr_set_state_target(bbr, __LINE__); 6484 tcp_bbr_tso_size_check(bbr, cts); 6485 if (bbr->r_recovery_bw) { 6486 bbr_setup_red_bw(bbr, cts); 6487 bbr_log_type_bw_reduce(bbr, BBR_RED_BW_USELRBW); 6488 } 6489 } else if ((orig_bw == 0) && get_filter_value(&bbr->r_ctl.rc_delrate)) 6490 tcp_bbr_tso_size_check(bbr, cts); 6491 } 6492 6493 static void 6494 bbr_nf_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6495 { 6496 if (bbr->rc_in_persist == 0) { 6497 /* We log only when not in persist */ 6498 /* Translate to a Bytes Per Second */ 6499 uint64_t tim, bw, ts_diff, ts_bw; 6500 uint32_t upper, lower, delivered; 6501 6502 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6503 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6504 else 6505 tim = 1; 6506 /* 6507 * Now that we have processed the tim (skipping the sample 6508 * or possibly updating the time, go ahead and 6509 * calculate the cdr. 6510 */ 6511 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6512 bw = (uint64_t)delivered; 6513 bw *= (uint64_t)USECS_IN_SECOND; 6514 bw /= tim; 6515 if (bw == 0) { 6516 /* We must have a calculatable amount */ 6517 return; 6518 } 6519 upper = (bw >> 32) & 0x00000000ffffffff; 6520 lower = bw & 0x00000000ffffffff; 6521 /* 6522 * If we are using this b/w shove it in now so we 6523 * can see in the trace viewer if it gets over-ridden. 6524 */ 6525 if (rsm->r_ts_valid && 6526 bbr->rc_ts_valid && 6527 bbr->rc_ts_clock_set && 6528 (bbr->rc_ts_cant_be_used == 0) && 6529 bbr->rc_use_ts_limit) { 6530 ts_diff = max((bbr->r_ctl.last_inbound_ts - rsm->r_del_ack_ts), 1); 6531 ts_diff *= bbr->r_ctl.bbr_peer_tsratio; 6532 if ((delivered == 0) || 6533 (rtt < 1000)) { 6534 /* Can't use the ts */ 6535 bbr_log_type_bbrupd(bbr, 61, cts, 6536 ts_diff, 6537 bbr->r_ctl.last_inbound_ts, 6538 rsm->r_del_ack_ts, 0, 6539 0, 0, 0, delivered); 6540 } else { 6541 ts_bw = (uint64_t)delivered; 6542 ts_bw *= (uint64_t)USECS_IN_SECOND; 6543 ts_bw /= ts_diff; 6544 bbr_log_type_bbrupd(bbr, 62, cts, 6545 (ts_bw >> 32), 6546 (ts_bw & 0xffffffff), 0, 0, 6547 0, 0, ts_diff, delivered); 6548 if ((bbr->ts_can_raise) && 6549 (ts_bw > bw)) { 6550 bbr_log_type_bbrupd(bbr, 8, cts, 6551 delivered, 6552 ts_diff, 6553 (bw >> 32), 6554 (bw & 0x00000000ffffffff), 6555 0, 0, 0, 0); 6556 bw = ts_bw; 6557 } else if (ts_bw && (ts_bw < bw)) { 6558 bbr_log_type_bbrupd(bbr, 7, cts, 6559 delivered, 6560 ts_diff, 6561 (bw >> 32), 6562 (bw & 0x00000000ffffffff), 6563 0, 0, 0, 0); 6564 bw = ts_bw; 6565 } 6566 } 6567 } 6568 if (rsm->r_first_sent_time && 6569 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6570 uint64_t sbw, sti; 6571 /* 6572 * We use what was in flight at the time of our 6573 * send and the size of this send to figure 6574 * out what we have been sending at (amount). 6575 * For the time we take from the time of 6576 * the send of the first send outstanding 6577 * until this send plus this sends pacing 6578 * time. This gives us a good calculation 6579 * as to the rate we have been sending at. 6580 */ 6581 6582 sbw = (uint64_t)(rsm->r_flight_at_send); 6583 sbw *= (uint64_t)USECS_IN_SECOND; 6584 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6585 sti += rsm->r_pacing_delay; 6586 sbw /= sti; 6587 if (sbw < bw) { 6588 bbr_log_type_bbrupd(bbr, 6, cts, 6589 delivered, 6590 (uint32_t)sti, 6591 (bw >> 32), 6592 (uint32_t)bw, 6593 rsm->r_first_sent_time, 0, (sbw >> 32), 6594 (uint32_t)sbw); 6595 bw = sbw; 6596 } 6597 } 6598 /* Use the google algorithm for b/w measurements */ 6599 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6600 if ((rsm->r_app_limited == 0) || 6601 (bw > get_filter_value(&bbr->r_ctl.rc_delrate))) { 6602 tcp_bbr_commit_bw(bbr, cts); 6603 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6604 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6605 } 6606 } 6607 } 6608 6609 static void 6610 bbr_google_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6611 { 6612 if (bbr->rc_in_persist == 0) { 6613 /* We log only when not in persist */ 6614 /* Translate to a Bytes Per Second */ 6615 uint64_t tim, bw; 6616 uint32_t upper, lower, delivered; 6617 int no_apply = 0; 6618 6619 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6620 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6621 else 6622 tim = 1; 6623 /* 6624 * Now that we have processed the tim (skipping the sample 6625 * or possibly updating the time, go ahead and 6626 * calculate the cdr. 6627 */ 6628 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6629 bw = (uint64_t)delivered; 6630 bw *= (uint64_t)USECS_IN_SECOND; 6631 bw /= tim; 6632 if (tim < bbr->r_ctl.rc_lowest_rtt) { 6633 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6634 tim, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6635 6636 no_apply = 1; 6637 } 6638 upper = (bw >> 32) & 0x00000000ffffffff; 6639 lower = bw & 0x00000000ffffffff; 6640 /* 6641 * If we are using this b/w shove it in now so we 6642 * can see in the trace viewer if it gets over-ridden. 6643 */ 6644 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6645 /* Gate by the sending rate */ 6646 if (rsm->r_first_sent_time && 6647 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6648 uint64_t sbw, sti; 6649 /* 6650 * We use what was in flight at the time of our 6651 * send and the size of this send to figure 6652 * out what we have been sending at (amount). 6653 * For the time we take from the time of 6654 * the send of the first send outstanding 6655 * until this send plus this sends pacing 6656 * time. This gives us a good calculation 6657 * as to the rate we have been sending at. 6658 */ 6659 6660 sbw = (uint64_t)(rsm->r_flight_at_send); 6661 sbw *= (uint64_t)USECS_IN_SECOND; 6662 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6663 sti += rsm->r_pacing_delay; 6664 sbw /= sti; 6665 if (sbw < bw) { 6666 bbr_log_type_bbrupd(bbr, 6, cts, 6667 delivered, 6668 (uint32_t)sti, 6669 (bw >> 32), 6670 (uint32_t)bw, 6671 rsm->r_first_sent_time, 0, (sbw >> 32), 6672 (uint32_t)sbw); 6673 bw = sbw; 6674 } 6675 if ((sti > tim) && 6676 (sti < bbr->r_ctl.rc_lowest_rtt)) { 6677 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6678 (uint32_t)sti, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6679 no_apply = 1; 6680 } else 6681 no_apply = 0; 6682 } 6683 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6684 if ((no_apply == 0) && 6685 ((rsm->r_app_limited == 0) || 6686 (bw > get_filter_value(&bbr->r_ctl.rc_delrate)))) { 6687 tcp_bbr_commit_bw(bbr, cts); 6688 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6689 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6690 } 6691 } 6692 } 6693 6694 static void 6695 bbr_update_bbr_info(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts, uint32_t tsin, 6696 uint32_t uts, int32_t match, uint32_t rsm_send_time, int32_t ack_type, struct tcpopt *to) 6697 { 6698 uint64_t old_rttprop; 6699 6700 /* Update our delivery time and amount */ 6701 bbr->r_ctl.rc_delivered += (rsm->r_end - rsm->r_start); 6702 bbr->r_ctl.rc_del_time = cts; 6703 if (rtt == 0) { 6704 /* 6705 * 0 means its a retransmit, for now we don't use these for 6706 * the rest of BBR. 6707 */ 6708 return; 6709 } 6710 if ((bbr->rc_use_google == 0) && 6711 (match != BBR_RTT_BY_EXACTMATCH) && 6712 (match != BBR_RTT_BY_TIMESTAMP)){ 6713 /* 6714 * We get a lot of rtt updates, lets not pay attention to 6715 * any that are not an exact match. That way we don't have 6716 * to worry about timestamps and the whole nonsense of 6717 * unsure if its a retransmission etc (if we ever had the 6718 * timestamp fixed to always have the last thing sent this 6719 * would not be a issue). 6720 */ 6721 return; 6722 } 6723 if ((bbr_no_retran && bbr->rc_use_google) && 6724 (match != BBR_RTT_BY_EXACTMATCH) && 6725 (match != BBR_RTT_BY_TIMESTAMP)){ 6726 /* 6727 * We only do measurements in google mode 6728 * with bbr_no_retran on for sure things. 6729 */ 6730 return; 6731 } 6732 /* Only update srtt if we know by exact match */ 6733 tcp_bbr_xmit_timer(bbr, rtt, rsm_send_time, rsm->r_start, tsin); 6734 if (ack_type == BBR_CUM_ACKED) 6735 bbr->rc_ack_is_cumack = 1; 6736 else 6737 bbr->rc_ack_is_cumack = 0; 6738 old_rttprop = bbr_get_rtt(bbr, BBR_RTT_PROP); 6739 /* 6740 * Note the following code differs to the original 6741 * BBR spec. It calls for <= not <. However after a 6742 * long discussion in email with Neal, he acknowledged 6743 * that it should be < than so that we will have flows 6744 * going into probe-rtt (we were seeing cases where that 6745 * did not happen and caused ugly things to occur). We 6746 * have added this agreed upon fix to our code base. 6747 */ 6748 if (rtt < old_rttprop) { 6749 /* Update when we last saw a rtt drop */ 6750 bbr_log_rtt_shrinks(bbr, cts, 0, rtt, __LINE__, BBR_RTTS_NEWRTT, 0); 6751 bbr_set_reduced_rtt(bbr, cts, __LINE__); 6752 } 6753 bbr_log_type_bbrrttprop(bbr, rtt, (rsm ? rsm->r_end : 0), uts, cts, 6754 match, rsm->r_start, rsm->r_flags); 6755 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6756 if (old_rttprop != bbr_get_rtt(bbr, BBR_RTT_PROP)) { 6757 /* 6758 * The RTT-prop moved, reset the target (may be a 6759 * nop for some states). 6760 */ 6761 bbr_set_state_target(bbr, __LINE__); 6762 if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) 6763 bbr_log_rtt_shrinks(bbr, cts, 0, 0, 6764 __LINE__, BBR_RTTS_NEW_TARGET, 0); 6765 else if (old_rttprop < bbr_get_rtt(bbr, BBR_RTT_PROP)) 6766 /* It went up */ 6767 bbr_check_probe_rtt_limits(bbr, cts); 6768 } 6769 if ((bbr->rc_use_google == 0) && 6770 (match == BBR_RTT_BY_TIMESTAMP)) { 6771 /* 6772 * We don't do b/w update with 6773 * these since they are not really 6774 * reliable. 6775 */ 6776 return; 6777 } 6778 if (bbr->r_ctl.r_app_limited_until && 6779 (bbr->r_ctl.rc_delivered >= bbr->r_ctl.r_app_limited_until)) { 6780 /* We are no longer app-limited */ 6781 bbr->r_ctl.r_app_limited_until = 0; 6782 } 6783 if (bbr->rc_use_google) { 6784 bbr_google_measurement(bbr, rsm, rtt, cts); 6785 } else { 6786 bbr_nf_measurement(bbr, rsm, rtt, cts); 6787 } 6788 } 6789 6790 /* 6791 * Convert a timestamp that the main stack 6792 * uses (milliseconds) into one that bbr uses 6793 * (microseconds). Return that converted timestamp. 6794 */ 6795 static uint32_t 6796 bbr_ts_convert(uint32_t cts) { 6797 uint32_t sec, msec; 6798 6799 sec = cts / MS_IN_USEC; 6800 msec = cts - (MS_IN_USEC * sec); 6801 return ((sec * USECS_IN_SECOND) + (msec * MS_IN_USEC)); 6802 } 6803 6804 /* 6805 * Return 0 if we did not update the RTT time, return 6806 * 1 if we did. 6807 */ 6808 static int 6809 bbr_update_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, 6810 struct bbr_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, uint32_t th_ack) 6811 { 6812 int32_t i; 6813 uint32_t t, uts = 0; 6814 6815 if ((rsm->r_flags & BBR_ACKED) || 6816 (rsm->r_flags & BBR_WAS_RENEGED) || 6817 (rsm->r_flags & BBR_RXT_CLEARED)) { 6818 /* Already done */ 6819 return (0); 6820 } 6821 if (rsm->r_rtt_not_allowed) { 6822 /* Not allowed */ 6823 return (0); 6824 } 6825 if (rsm->r_rtr_cnt == 1) { 6826 /* 6827 * Only one transmit. Hopefully the normal case. 6828 */ 6829 if (TSTMP_GT(cts, rsm->r_tim_lastsent[0])) 6830 t = cts - rsm->r_tim_lastsent[0]; 6831 else 6832 t = 1; 6833 if ((int)t <= 0) 6834 t = 1; 6835 bbr->r_ctl.rc_last_rtt = t; 6836 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 6837 BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to); 6838 return (1); 6839 } 6840 /* Convert to usecs */ 6841 if ((bbr_can_use_ts_for_rtt == 1) && 6842 (bbr->rc_use_google == 1) && 6843 (ack_type == BBR_CUM_ACKED) && 6844 (to->to_flags & TOF_TS) && 6845 (to->to_tsecr != 0)) { 6846 t = tcp_tv_to_mssectick(&bbr->rc_tv) - to->to_tsecr; 6847 if (t < 1) 6848 t = 1; 6849 t *= MS_IN_USEC; 6850 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 6851 BBR_RTT_BY_TIMESTAMP, 6852 rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)], 6853 ack_type, to); 6854 return (1); 6855 } 6856 uts = bbr_ts_convert(to->to_tsecr); 6857 if ((to->to_flags & TOF_TS) && 6858 (to->to_tsecr != 0) && 6859 (ack_type == BBR_CUM_ACKED) && 6860 ((rsm->r_flags & BBR_OVERMAX) == 0)) { 6861 /* 6862 * Now which timestamp does it match? In this block the ACK 6863 * may be coming from a previous transmission. 6864 */ 6865 uint32_t fudge; 6866 6867 fudge = BBR_TIMER_FUDGE; 6868 for (i = 0; i < rsm->r_rtr_cnt; i++) { 6869 if ((SEQ_GEQ(uts, (rsm->r_tim_lastsent[i] - fudge))) && 6870 (SEQ_LEQ(uts, (rsm->r_tim_lastsent[i] + fudge)))) { 6871 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6872 t = cts - rsm->r_tim_lastsent[i]; 6873 else 6874 t = 1; 6875 if ((int)t <= 0) 6876 t = 1; 6877 bbr->r_ctl.rc_last_rtt = t; 6878 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING, 6879 rsm->r_tim_lastsent[i], ack_type, to); 6880 if ((i + 1) < rsm->r_rtr_cnt) { 6881 /* Likely */ 6882 return (0); 6883 } else if (rsm->r_flags & BBR_TLP) { 6884 bbr->rc_tlp_rtx_out = 0; 6885 } 6886 return (1); 6887 } 6888 } 6889 /* Fall through if we can't find a matching timestamp */ 6890 } 6891 /* 6892 * Ok its a SACK block that we retransmitted. or a windows 6893 * machine without timestamps. We can tell nothing from the 6894 * time-stamp since its not there or the time the peer last 6895 * recieved a segment that moved forward its cum-ack point. 6896 * 6897 * Lets look at the last retransmit and see what we can tell 6898 * (with BBR for space we only keep 2 note we have to keep 6899 * at least 2 so the map can not be condensed more). 6900 */ 6901 i = rsm->r_rtr_cnt - 1; 6902 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6903 t = cts - rsm->r_tim_lastsent[i]; 6904 else 6905 goto not_sure; 6906 if (t < bbr->r_ctl.rc_lowest_rtt) { 6907 /* 6908 * We retransmitted and the ack came back in less 6909 * than the smallest rtt we have observed in the 6910 * windowed rtt. We most likey did an improper 6911 * retransmit as outlined in 4.2 Step 3 point 2 in 6912 * the rack-draft. 6913 * 6914 * Use the prior transmission to update all the 6915 * information as long as there is only one prior 6916 * transmission. 6917 */ 6918 if ((rsm->r_flags & BBR_OVERMAX) == 0) { 6919 #ifdef BBR_INVARIANTS 6920 if (rsm->r_rtr_cnt == 1) 6921 panic("rsm:%p bbr:%p rsm has overmax and only 1 retranmit flags:%x?", rsm, bbr, rsm->r_flags); 6922 #endif 6923 i = rsm->r_rtr_cnt - 2; 6924 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6925 t = cts - rsm->r_tim_lastsent[i]; 6926 else 6927 t = 1; 6928 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_EARLIER_RET, 6929 rsm->r_tim_lastsent[i], ack_type, to); 6930 return (0); 6931 } else { 6932 /* 6933 * Too many prior transmissions, just 6934 * updated BBR delivered 6935 */ 6936 not_sure: 6937 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 6938 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 6939 } 6940 } else { 6941 /* 6942 * We retransmitted it and the retransmit did the 6943 * job. 6944 */ 6945 if (rsm->r_flags & BBR_TLP) 6946 bbr->rc_tlp_rtx_out = 0; 6947 if ((rsm->r_flags & BBR_OVERMAX) == 0) 6948 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, 6949 BBR_RTT_BY_THIS_RETRAN, 0, ack_type, to); 6950 else 6951 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 6952 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 6953 return (1); 6954 } 6955 return (0); 6956 } 6957 6958 /* 6959 * Mark the SACK_PASSED flag on all entries prior to rsm send wise. 6960 */ 6961 static void 6962 bbr_log_sack_passed(struct tcpcb *tp, 6963 struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 6964 { 6965 struct bbr_sendmap *nrsm; 6966 6967 nrsm = rsm; 6968 TAILQ_FOREACH_REVERSE_FROM(nrsm, &bbr->r_ctl.rc_tmap, 6969 bbr_head, r_tnext) { 6970 if (nrsm == rsm) { 6971 /* Skip orginal segment he is acked */ 6972 continue; 6973 } 6974 if (nrsm->r_flags & BBR_ACKED) { 6975 /* Skip ack'd segments */ 6976 continue; 6977 } 6978 if (nrsm->r_flags & BBR_SACK_PASSED) { 6979 /* 6980 * We found one that is already marked 6981 * passed, we have been here before and 6982 * so all others below this are marked. 6983 */ 6984 break; 6985 } 6986 BBR_STAT_INC(bbr_sack_passed); 6987 nrsm->r_flags |= BBR_SACK_PASSED; 6988 if (((nrsm->r_flags & BBR_MARKED_LOST) == 0) && 6989 bbr_is_lost(bbr, nrsm, bbr->r_ctl.rc_rcvtime)) { 6990 bbr->r_ctl.rc_lost += nrsm->r_end - nrsm->r_start; 6991 bbr->r_ctl.rc_lost_bytes += nrsm->r_end - nrsm->r_start; 6992 nrsm->r_flags |= BBR_MARKED_LOST; 6993 } 6994 nrsm->r_flags &= ~BBR_WAS_SACKPASS; 6995 } 6996 } 6997 6998 /* 6999 * Returns the number of bytes that were 7000 * newly ack'd by sack blocks. 7001 */ 7002 static uint32_t 7003 bbr_proc_sack_blk(struct tcpcb *tp, struct tcp_bbr *bbr, struct sackblk *sack, 7004 struct tcpopt *to, struct bbr_sendmap **prsm, uint32_t cts) 7005 { 7006 int32_t times = 0; 7007 uint32_t start, end, maxseg, changed = 0; 7008 struct bbr_sendmap *rsm, *nrsm; 7009 int32_t used_ref = 1; 7010 uint8_t went_back = 0, went_fwd = 0; 7011 7012 maxseg = tp->t_maxseg - bbr->rc_last_options; 7013 start = sack->start; 7014 end = sack->end; 7015 rsm = *prsm; 7016 if (rsm == NULL) 7017 used_ref = 0; 7018 7019 /* Do we locate the block behind where we last were? */ 7020 if (rsm && SEQ_LT(start, rsm->r_start)) { 7021 went_back = 1; 7022 TAILQ_FOREACH_REVERSE_FROM(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 7023 if (SEQ_GEQ(start, rsm->r_start) && 7024 SEQ_LT(start, rsm->r_end)) { 7025 goto do_rest_ofb; 7026 } 7027 } 7028 } 7029 start_at_beginning: 7030 went_fwd = 1; 7031 /* 7032 * Ok lets locate the block where this guy is fwd from rsm (if its 7033 * set) 7034 */ 7035 TAILQ_FOREACH_FROM(rsm, &bbr->r_ctl.rc_map, r_next) { 7036 if (SEQ_GEQ(start, rsm->r_start) && 7037 SEQ_LT(start, rsm->r_end)) { 7038 break; 7039 } 7040 } 7041 do_rest_ofb: 7042 if (rsm == NULL) { 7043 /* 7044 * This happens when we get duplicate sack blocks with the 7045 * same end. For example SACK 4: 100 SACK 3: 100 The sort 7046 * will not change there location so we would just start at 7047 * the end of the first one and get lost. 7048 */ 7049 if (tp->t_flags & TF_SENTFIN) { 7050 /* 7051 * Check to see if we have not logged the FIN that 7052 * went out. 7053 */ 7054 nrsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7055 if (nrsm && (nrsm->r_end + 1) == tp->snd_max) { 7056 /* 7057 * Ok we did not get the FIN logged. 7058 */ 7059 nrsm->r_end++; 7060 rsm = nrsm; 7061 goto do_rest_ofb; 7062 } 7063 } 7064 if (times == 1) { 7065 #ifdef BBR_INVARIANTS 7066 panic("tp:%p bbr:%p sack:%p to:%p prsm:%p", 7067 tp, bbr, sack, to, prsm); 7068 #else 7069 goto out; 7070 #endif 7071 } 7072 times++; 7073 BBR_STAT_INC(bbr_sack_proc_restart); 7074 rsm = NULL; 7075 goto start_at_beginning; 7076 } 7077 /* Ok we have an ACK for some piece of rsm */ 7078 if (rsm->r_start != start) { 7079 /* 7080 * Need to split this in two pieces the before and after. 7081 */ 7082 if (bbr_sack_mergable(rsm, start, end)) 7083 nrsm = bbr_alloc_full_limit(bbr); 7084 else 7085 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7086 if (nrsm == NULL) { 7087 /* We could not allocate ignore the sack */ 7088 struct sackblk blk; 7089 7090 blk.start = start; 7091 blk.end = end; 7092 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7093 goto out; 7094 } 7095 bbr_clone_rsm(bbr, nrsm, rsm, start); 7096 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7097 if (rsm->r_in_tmap) { 7098 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7099 nrsm->r_in_tmap = 1; 7100 } 7101 rsm->r_flags &= (~BBR_HAS_FIN); 7102 rsm = nrsm; 7103 } 7104 if (SEQ_GEQ(end, rsm->r_end)) { 7105 /* 7106 * The end of this block is either beyond this guy or right 7107 * at this guy. 7108 */ 7109 if ((rsm->r_flags & BBR_ACKED) == 0) { 7110 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7111 changed += (rsm->r_end - rsm->r_start); 7112 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7113 bbr_log_sack_passed(tp, bbr, rsm); 7114 if (rsm->r_flags & BBR_MARKED_LOST) { 7115 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7116 } 7117 /* Is Reordering occuring? */ 7118 if (rsm->r_flags & BBR_SACK_PASSED) { 7119 BBR_STAT_INC(bbr_reorder_seen); 7120 bbr->r_ctl.rc_reorder_ts = cts; 7121 if (rsm->r_flags & BBR_MARKED_LOST) { 7122 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7123 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7124 /* LT sampling also needs adjustment */ 7125 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7126 } 7127 } 7128 rsm->r_flags |= BBR_ACKED; 7129 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7130 if (rsm->r_in_tmap) { 7131 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7132 rsm->r_in_tmap = 0; 7133 } 7134 } 7135 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7136 if (end == rsm->r_end) { 7137 /* This block only - done */ 7138 goto out; 7139 } 7140 /* There is more not coverend by this rsm move on */ 7141 start = rsm->r_end; 7142 nrsm = TAILQ_NEXT(rsm, r_next); 7143 rsm = nrsm; 7144 times = 0; 7145 goto do_rest_ofb; 7146 } 7147 if (rsm->r_flags & BBR_ACKED) { 7148 /* Been here done that */ 7149 goto out; 7150 } 7151 /* Ok we need to split off this one at the tail */ 7152 if (bbr_sack_mergable(rsm, start, end)) 7153 nrsm = bbr_alloc_full_limit(bbr); 7154 else 7155 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7156 if (nrsm == NULL) { 7157 /* failed XXXrrs what can we do but loose the sack info? */ 7158 struct sackblk blk; 7159 7160 blk.start = start; 7161 blk.end = end; 7162 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7163 goto out; 7164 } 7165 /* Clone it */ 7166 bbr_clone_rsm(bbr, nrsm, rsm, end); 7167 /* The sack block does not cover this guy fully */ 7168 rsm->r_flags &= (~BBR_HAS_FIN); 7169 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7170 if (rsm->r_in_tmap) { 7171 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7172 nrsm->r_in_tmap = 1; 7173 } 7174 nrsm->r_dupack = 0; 7175 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7176 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7177 changed += (rsm->r_end - rsm->r_start); 7178 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7179 bbr_log_sack_passed(tp, bbr, rsm); 7180 /* Is Reordering occuring? */ 7181 if (rsm->r_flags & BBR_MARKED_LOST) { 7182 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7183 } 7184 if (rsm->r_flags & BBR_SACK_PASSED) { 7185 BBR_STAT_INC(bbr_reorder_seen); 7186 bbr->r_ctl.rc_reorder_ts = cts; 7187 if (rsm->r_flags & BBR_MARKED_LOST) { 7188 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7189 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7190 /* LT sampling also needs adjustment */ 7191 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7192 } 7193 } 7194 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7195 rsm->r_flags |= BBR_ACKED; 7196 if (rsm->r_in_tmap) { 7197 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7198 rsm->r_in_tmap = 0; 7199 } 7200 out: 7201 if (rsm && (rsm->r_flags & BBR_ACKED)) { 7202 /* 7203 * Now can we merge this newly acked 7204 * block with either the previous or 7205 * next block? 7206 */ 7207 nrsm = TAILQ_NEXT(rsm, r_next); 7208 if (nrsm && 7209 (nrsm->r_flags & BBR_ACKED)) { 7210 /* yep this and next can be merged */ 7211 rsm = bbr_merge_rsm(bbr, rsm, nrsm); 7212 } 7213 /* Now what about the previous? */ 7214 nrsm = TAILQ_PREV(rsm, bbr_head, r_next); 7215 if (nrsm && 7216 (nrsm->r_flags & BBR_ACKED)) { 7217 /* yep the previous and this can be merged */ 7218 rsm = bbr_merge_rsm(bbr, nrsm, rsm); 7219 } 7220 } 7221 if (used_ref == 0) { 7222 BBR_STAT_INC(bbr_sack_proc_all); 7223 } else { 7224 BBR_STAT_INC(bbr_sack_proc_short); 7225 } 7226 if (went_fwd && went_back) { 7227 BBR_STAT_INC(bbr_sack_search_both); 7228 } else if (went_fwd) { 7229 BBR_STAT_INC(bbr_sack_search_fwd); 7230 } else if (went_back) { 7231 BBR_STAT_INC(bbr_sack_search_back); 7232 } 7233 /* Save off where the next seq is */ 7234 if (rsm) 7235 bbr->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next); 7236 else 7237 bbr->r_ctl.rc_sacklast = NULL; 7238 *prsm = rsm; 7239 return (changed); 7240 } 7241 7242 static void inline 7243 bbr_peer_reneges(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, tcp_seq th_ack) 7244 { 7245 struct bbr_sendmap *tmap; 7246 7247 BBR_STAT_INC(bbr_reneges_seen); 7248 tmap = NULL; 7249 while (rsm && (rsm->r_flags & BBR_ACKED)) { 7250 /* Its no longer sacked, mark it so */ 7251 uint32_t oflags; 7252 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7253 #ifdef BBR_INVARIANTS 7254 if (rsm->r_in_tmap) { 7255 panic("bbr:%p rsm:%p flags:0x%x in tmap?", 7256 bbr, rsm, rsm->r_flags); 7257 } 7258 #endif 7259 oflags = rsm->r_flags; 7260 if (rsm->r_flags & BBR_MARKED_LOST) { 7261 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7262 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7263 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7264 /* LT sampling also needs adjustment */ 7265 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7266 } 7267 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS | BBR_MARKED_LOST); 7268 rsm->r_flags |= BBR_WAS_RENEGED; 7269 rsm->r_flags |= BBR_RXT_CLEARED; 7270 bbr_log_type_rsmclear(bbr, bbr->r_ctl.rc_rcvtime, rsm, oflags, __LINE__); 7271 /* Rebuild it into our tmap */ 7272 if (tmap == NULL) { 7273 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7274 tmap = rsm; 7275 } else { 7276 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, tmap, rsm, r_tnext); 7277 tmap = rsm; 7278 } 7279 tmap->r_in_tmap = 1; 7280 /* 7281 * XXXrrs Delivered? Should we do anything here? 7282 * 7283 * Of course we don't on a rxt timeout so maybe its ok that 7284 * we don't? 7285 * 7286 * For now lets not. 7287 */ 7288 rsm = TAILQ_NEXT(rsm, r_next); 7289 } 7290 /* 7291 * Now lets possibly clear the sack filter so we start recognizing 7292 * sacks that cover this area. 7293 */ 7294 sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack); 7295 } 7296 7297 static void 7298 bbr_log_syn(struct tcpcb *tp, struct tcpopt *to) 7299 { 7300 struct tcp_bbr *bbr; 7301 struct bbr_sendmap *rsm; 7302 uint32_t cts; 7303 7304 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7305 cts = bbr->r_ctl.rc_rcvtime; 7306 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7307 if (rsm && (rsm->r_flags & BBR_HAS_SYN)) { 7308 if ((rsm->r_end - rsm->r_start) <= 1) { 7309 /* Log out the SYN completely */ 7310 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7311 rsm->r_rtr_bytes = 0; 7312 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7313 if (rsm->r_in_tmap) { 7314 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7315 rsm->r_in_tmap = 0; 7316 } 7317 if (bbr->r_ctl.rc_next == rsm) { 7318 /* scoot along the marker */ 7319 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7320 } 7321 if (to != NULL) 7322 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, 0); 7323 bbr_free(bbr, rsm); 7324 } else { 7325 /* There is more (Fast open)? strip out SYN. */ 7326 rsm->r_flags &= ~BBR_HAS_SYN; 7327 rsm->r_start++; 7328 } 7329 } 7330 } 7331 7332 /* 7333 * Returns the number of bytes that were 7334 * acknowledged by SACK blocks. 7335 */ 7336 7337 static uint32_t 7338 bbr_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, 7339 uint32_t *prev_acked) 7340 { 7341 uint32_t changed, last_seq, entered_recovery = 0; 7342 struct tcp_bbr *bbr; 7343 struct bbr_sendmap *rsm; 7344 struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1]; 7345 register uint32_t th_ack; 7346 int32_t i, j, k, new_sb, num_sack_blks = 0; 7347 uint32_t cts, acked, ack_point, sack_changed = 0; 7348 uint32_t p_maxseg, maxseg, p_acked = 0; 7349 7350 INP_WLOCK_ASSERT(tp->t_inpcb); 7351 if (th->th_flags & TH_RST) { 7352 /* We don't log resets */ 7353 return (0); 7354 } 7355 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7356 cts = bbr->r_ctl.rc_rcvtime; 7357 7358 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7359 changed = 0; 7360 maxseg = tp->t_maxseg - bbr->rc_last_options; 7361 p_maxseg = min(bbr->r_ctl.rc_pace_max_segs, maxseg); 7362 th_ack = th->th_ack; 7363 if (SEQ_GT(th_ack, tp->snd_una)) { 7364 acked = th_ack - tp->snd_una; 7365 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_UPDATE, __LINE__); 7366 bbr->rc_tp->t_acktime = ticks; 7367 } else 7368 acked = 0; 7369 if (SEQ_LEQ(th_ack, tp->snd_una)) { 7370 /* Only sent here for sack processing */ 7371 goto proc_sack; 7372 } 7373 if (rsm && SEQ_GT(th_ack, rsm->r_start)) { 7374 changed = th_ack - rsm->r_start; 7375 } else if ((rsm == NULL) && ((th_ack - 1) == tp->iss)) { 7376 /* 7377 * For the SYN incoming case we will not have called 7378 * tcp_output for the sending of the SYN, so there will be 7379 * no map. All other cases should probably be a panic. 7380 */ 7381 if ((to->to_flags & TOF_TS) && (to->to_tsecr != 0)) { 7382 /* 7383 * We have a timestamp that can be used to generate 7384 * an initial RTT. 7385 */ 7386 uint32_t ts, now, rtt; 7387 7388 ts = bbr_ts_convert(to->to_tsecr); 7389 now = bbr_ts_convert(tcp_tv_to_mssectick(&bbr->rc_tv)); 7390 rtt = now - ts; 7391 if (rtt < 1) 7392 rtt = 1; 7393 bbr_log_type_bbrrttprop(bbr, rtt, 7394 tp->iss, 0, cts, 7395 BBR_RTT_BY_TIMESTAMP, tp->iss, 0); 7396 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 7397 changed = 1; 7398 bbr->r_wanted_output = 1; 7399 goto out; 7400 } 7401 goto proc_sack; 7402 } else if (rsm == NULL) { 7403 goto out; 7404 } 7405 if (changed) { 7406 /* 7407 * The ACK point is advancing to th_ack, we must drop off 7408 * the packets in the rack log and calculate any eligble 7409 * RTT's. 7410 */ 7411 bbr->r_wanted_output = 1; 7412 more: 7413 if (rsm == NULL) { 7414 if (tp->t_flags & TF_SENTFIN) { 7415 /* if we send a FIN we will not hav a map */ 7416 goto proc_sack; 7417 } 7418 #ifdef BBR_INVARIANTS 7419 panic("No rack map tp:%p for th:%p state:%d bbr:%p snd_una:%u snd_max:%u chg:%d\n", 7420 tp, 7421 th, tp->t_state, bbr, 7422 tp->snd_una, tp->snd_max, changed); 7423 #endif 7424 goto proc_sack; 7425 } 7426 } 7427 if (SEQ_LT(th_ack, rsm->r_start)) { 7428 /* Huh map is missing this */ 7429 #ifdef BBR_INVARIANTS 7430 printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d bbr:%p\n", 7431 rsm->r_start, 7432 th_ack, tp->t_state, 7433 bbr->r_state, bbr); 7434 panic("th-ack is bad bbr:%p tp:%p", bbr, tp); 7435 #endif 7436 goto proc_sack; 7437 } else if (th_ack == rsm->r_start) { 7438 /* None here to ack */ 7439 goto proc_sack; 7440 } 7441 /* 7442 * Clear the dup ack counter, it will 7443 * either be freed or if there is some 7444 * remaining we need to start it at zero. 7445 */ 7446 rsm->r_dupack = 0; 7447 /* Now do we consume the whole thing? */ 7448 if (SEQ_GEQ(th_ack, rsm->r_end)) { 7449 /* Its all consumed. */ 7450 uint32_t left; 7451 7452 if (rsm->r_flags & BBR_ACKED) { 7453 /* 7454 * It was acked on the scoreboard -- remove it from 7455 * total 7456 */ 7457 p_acked += (rsm->r_end - rsm->r_start); 7458 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7459 if (bbr->r_ctl.rc_sacked == 0) 7460 bbr->r_ctl.rc_sacklast = NULL; 7461 } else { 7462 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, th_ack); 7463 if (rsm->r_flags & BBR_MARKED_LOST) { 7464 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7465 } 7466 if (rsm->r_flags & BBR_SACK_PASSED) { 7467 /* 7468 * There are acked segments ACKED on the 7469 * scoreboard further up. We are seeing 7470 * reordering. 7471 */ 7472 BBR_STAT_INC(bbr_reorder_seen); 7473 bbr->r_ctl.rc_reorder_ts = cts; 7474 if (rsm->r_flags & BBR_MARKED_LOST) { 7475 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7476 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7477 /* LT sampling also needs adjustment */ 7478 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7479 } 7480 } 7481 rsm->r_flags &= ~BBR_MARKED_LOST; 7482 } 7483 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7484 rsm->r_rtr_bytes = 0; 7485 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7486 if (rsm->r_in_tmap) { 7487 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7488 rsm->r_in_tmap = 0; 7489 } 7490 if (bbr->r_ctl.rc_next == rsm) { 7491 /* scoot along the marker */ 7492 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7493 } 7494 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7495 /* Adjust the packet counts */ 7496 left = th_ack - rsm->r_end; 7497 /* Free back to zone */ 7498 bbr_free(bbr, rsm); 7499 if (left) { 7500 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7501 goto more; 7502 } 7503 goto proc_sack; 7504 } 7505 if (rsm->r_flags & BBR_ACKED) { 7506 /* 7507 * It was acked on the scoreboard -- remove it from total 7508 * for the part being cum-acked. 7509 */ 7510 p_acked += (rsm->r_end - rsm->r_start); 7511 bbr->r_ctl.rc_sacked -= (th_ack - rsm->r_start); 7512 if (bbr->r_ctl.rc_sacked == 0) 7513 bbr->r_ctl.rc_sacklast = NULL; 7514 } else { 7515 /* 7516 * It was acked up to th_ack point for the first time 7517 */ 7518 struct bbr_sendmap lrsm; 7519 7520 memcpy(&lrsm, rsm, sizeof(struct bbr_sendmap)); 7521 lrsm.r_end = th_ack; 7522 bbr_update_rtt(tp, bbr, &lrsm, to, cts, BBR_CUM_ACKED, th_ack); 7523 } 7524 if ((rsm->r_flags & BBR_MARKED_LOST) && 7525 ((rsm->r_flags & BBR_ACKED) == 0)) { 7526 /* 7527 * It was marked lost and partly ack'd now 7528 * for the first time. We lower the rc_lost_bytes 7529 * and still leave it MARKED. 7530 */ 7531 bbr->r_ctl.rc_lost_bytes -= th_ack - rsm->r_start; 7532 } 7533 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7534 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7535 rsm->r_rtr_bytes = 0; 7536 /* adjust packet count */ 7537 rsm->r_start = th_ack; 7538 proc_sack: 7539 /* Check for reneging */ 7540 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7541 if (rsm && (rsm->r_flags & BBR_ACKED) && (th_ack == rsm->r_start)) { 7542 /* 7543 * The peer has moved snd_una up to the edge of this send, 7544 * i.e. one that it had previously acked. The only way that 7545 * can be true if the peer threw away data (space issues) 7546 * that it had previously sacked (else it would have given 7547 * us snd_una up to (rsm->r_end). We need to undo the acked 7548 * markings here. 7549 * 7550 * Note we have to look to make sure th_ack is our 7551 * rsm->r_start in case we get an old ack where th_ack is 7552 * behind snd_una. 7553 */ 7554 bbr_peer_reneges(bbr, rsm, th->th_ack); 7555 } 7556 if ((to->to_flags & TOF_SACK) == 0) { 7557 /* We are done nothing left to log */ 7558 goto out; 7559 } 7560 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7561 if (rsm) { 7562 last_seq = rsm->r_end; 7563 } else { 7564 last_seq = tp->snd_max; 7565 } 7566 /* Sack block processing */ 7567 if (SEQ_GT(th_ack, tp->snd_una)) 7568 ack_point = th_ack; 7569 else 7570 ack_point = tp->snd_una; 7571 for (i = 0; i < to->to_nsacks; i++) { 7572 bcopy((to->to_sacks + i * TCPOLEN_SACK), 7573 &sack, sizeof(sack)); 7574 sack.start = ntohl(sack.start); 7575 sack.end = ntohl(sack.end); 7576 if (SEQ_GT(sack.end, sack.start) && 7577 SEQ_GT(sack.start, ack_point) && 7578 SEQ_LT(sack.start, tp->snd_max) && 7579 SEQ_GT(sack.end, ack_point) && 7580 SEQ_LEQ(sack.end, tp->snd_max)) { 7581 if ((bbr->r_ctl.rc_num_small_maps_alloced > bbr_sack_block_limit) && 7582 (SEQ_LT(sack.end, last_seq)) && 7583 ((sack.end - sack.start) < (p_maxseg / 8))) { 7584 /* 7585 * Not the last piece and its smaller than 7586 * 1/8th of a p_maxseg. We ignore this. 7587 */ 7588 BBR_STAT_INC(bbr_runt_sacks); 7589 continue; 7590 } 7591 sack_blocks[num_sack_blks] = sack; 7592 num_sack_blks++; 7593 #ifdef NETFLIX_STATS 7594 } else if (SEQ_LEQ(sack.start, th_ack) && 7595 SEQ_LEQ(sack.end, th_ack)) { 7596 /* 7597 * Its a D-SACK block. 7598 */ 7599 tcp_record_dsack(sack.start, sack.end); 7600 #endif 7601 } 7602 } 7603 if (num_sack_blks == 0) 7604 goto out; 7605 /* 7606 * Sort the SACK blocks so we can update the rack scoreboard with 7607 * just one pass. 7608 */ 7609 new_sb = sack_filter_blks(&bbr->r_ctl.bbr_sf, sack_blocks, 7610 num_sack_blks, th->th_ack); 7611 ctf_log_sack_filter(bbr->rc_tp, new_sb, sack_blocks); 7612 BBR_STAT_ADD(bbr_sack_blocks, num_sack_blks); 7613 BBR_STAT_ADD(bbr_sack_blocks_skip, (num_sack_blks - new_sb)); 7614 num_sack_blks = new_sb; 7615 if (num_sack_blks < 2) { 7616 goto do_sack_work; 7617 } 7618 /* Sort the sacks */ 7619 for (i = 0; i < num_sack_blks; i++) { 7620 for (j = i + 1; j < num_sack_blks; j++) { 7621 if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) { 7622 sack = sack_blocks[i]; 7623 sack_blocks[i] = sack_blocks[j]; 7624 sack_blocks[j] = sack; 7625 } 7626 } 7627 } 7628 /* 7629 * Now are any of the sack block ends the same (yes some 7630 * implememtations send these)? 7631 */ 7632 again: 7633 if (num_sack_blks > 1) { 7634 for (i = 0; i < num_sack_blks; i++) { 7635 for (j = i + 1; j < num_sack_blks; j++) { 7636 if (sack_blocks[i].end == sack_blocks[j].end) { 7637 /* 7638 * Ok these two have the same end we 7639 * want the smallest end and then 7640 * throw away the larger and start 7641 * again. 7642 */ 7643 if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) { 7644 /* 7645 * The second block covers 7646 * more area use that 7647 */ 7648 sack_blocks[i].start = sack_blocks[j].start; 7649 } 7650 /* 7651 * Now collapse out the dup-sack and 7652 * lower the count 7653 */ 7654 for (k = (j + 1); k < num_sack_blks; k++) { 7655 sack_blocks[j].start = sack_blocks[k].start; 7656 sack_blocks[j].end = sack_blocks[k].end; 7657 j++; 7658 } 7659 num_sack_blks--; 7660 goto again; 7661 } 7662 } 7663 } 7664 } 7665 do_sack_work: 7666 rsm = bbr->r_ctl.rc_sacklast; 7667 for (i = 0; i < num_sack_blks; i++) { 7668 acked = bbr_proc_sack_blk(tp, bbr, &sack_blocks[i], to, &rsm, cts); 7669 if (acked) { 7670 bbr->r_wanted_output = 1; 7671 changed += acked; 7672 sack_changed += acked; 7673 } 7674 } 7675 out: 7676 *prev_acked = p_acked; 7677 if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) { 7678 /* 7679 * Ok we have a high probability that we need to go in to 7680 * recovery since we have data sack'd 7681 */ 7682 struct bbr_sendmap *rsm; 7683 7684 rsm = bbr_check_recovery_mode(tp, bbr, cts); 7685 if (rsm) { 7686 /* Enter recovery */ 7687 entered_recovery = 1; 7688 bbr->r_wanted_output = 1; 7689 /* 7690 * When we enter recovery we need to assure we send 7691 * one packet. 7692 */ 7693 if (bbr->r_ctl.rc_resend == NULL) { 7694 bbr->r_ctl.rc_resend = rsm; 7695 } 7696 } 7697 } 7698 if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) { 7699 /* 7700 * See if we need to rack-retransmit anything if so set it 7701 * up as the thing to resend assuming something else is not 7702 * already in that position. 7703 */ 7704 if (bbr->r_ctl.rc_resend == NULL) { 7705 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 7706 } 7707 } 7708 /* 7709 * We return the amount that changed via sack, this is used by the 7710 * ack-received code to augment what was changed between th_ack <-> 7711 * snd_una. 7712 */ 7713 return (sack_changed); 7714 } 7715 7716 static void 7717 bbr_strike_dupack(struct tcp_bbr *bbr) 7718 { 7719 struct bbr_sendmap *rsm; 7720 7721 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 7722 if (rsm && (rsm->r_dupack < 0xff)) { 7723 rsm->r_dupack++; 7724 if (rsm->r_dupack >= DUP_ACK_THRESHOLD) 7725 bbr->r_wanted_output = 1; 7726 } 7727 } 7728 7729 /* 7730 * Return value of 1, we do not need to call bbr_process_data(). 7731 * return value of 0, bbr_process_data can be called. 7732 * For ret_val if its 0 the TCB is locked and valid, if its non-zero 7733 * its unlocked and probably unsafe to touch the TCB. 7734 */ 7735 static int 7736 bbr_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, 7737 struct tcpcb *tp, struct tcpopt *to, 7738 uint32_t tiwin, int32_t tlen, 7739 int32_t * ofia, int32_t thflags, int32_t * ret_val) 7740 { 7741 int32_t ourfinisacked = 0; 7742 int32_t acked_amount; 7743 uint16_t nsegs; 7744 int32_t acked; 7745 uint32_t lost, sack_changed = 0; 7746 struct mbuf *mfree; 7747 struct tcp_bbr *bbr; 7748 uint32_t prev_acked = 0; 7749 7750 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7751 lost = bbr->r_ctl.rc_lost; 7752 nsegs = max(1, m->m_pkthdr.lro_nsegs); 7753 if (SEQ_GT(th->th_ack, tp->snd_max)) { 7754 ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val); 7755 bbr->r_wanted_output = 1; 7756 return (1); 7757 } 7758 if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) { 7759 /* Process the ack */ 7760 if (bbr->rc_in_persist) 7761 tp->t_rxtshift = 0; 7762 if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd)) 7763 bbr_strike_dupack(bbr); 7764 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 7765 } 7766 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, (bbr->r_ctl.rc_lost > lost)); 7767 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 7768 /* 7769 * Old ack, behind the last one rcv'd or a duplicate ack 7770 * with SACK info. 7771 */ 7772 if (th->th_ack == tp->snd_una) { 7773 bbr_ack_received(tp, bbr, th, 0, sack_changed, prev_acked, __LINE__, 0); 7774 if (bbr->r_state == TCPS_SYN_SENT) { 7775 /* 7776 * Special case on where we sent SYN. When 7777 * the SYN-ACK is processed in syn_sent 7778 * state it bumps the snd_una. This causes 7779 * us to hit here even though we did ack 1 7780 * byte. 7781 * 7782 * Go through the nothing left case so we 7783 * send data. 7784 */ 7785 goto nothing_left; 7786 } 7787 } 7788 return (0); 7789 } 7790 /* 7791 * If we reach this point, ACK is not a duplicate, i.e., it ACKs 7792 * something we sent. 7793 */ 7794 if (tp->t_flags & TF_NEEDSYN) { 7795 /* 7796 * T/TCP: Connection was half-synchronized, and our SYN has 7797 * been ACK'd (so connection is now fully synchronized). Go 7798 * to non-starred state, increment snd_una for ACK of SYN, 7799 * and check if we can do window scaling. 7800 */ 7801 tp->t_flags &= ~TF_NEEDSYN; 7802 tp->snd_una++; 7803 /* Do window scaling? */ 7804 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 7805 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 7806 tp->rcv_scale = tp->request_r_scale; 7807 /* Send window already scaled. */ 7808 } 7809 } 7810 INP_WLOCK_ASSERT(tp->t_inpcb); 7811 7812 acked = BYTES_THIS_ACK(tp, th); 7813 KMOD_TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 7814 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked); 7815 7816 /* 7817 * If we just performed our first retransmit, and the ACK arrives 7818 * within our recovery window, then it was a mistake to do the 7819 * retransmit in the first place. Recover our original cwnd and 7820 * ssthresh, and proceed to transmit where we left off. 7821 */ 7822 if (tp->t_flags & TF_PREVVALID) { 7823 tp->t_flags &= ~TF_PREVVALID; 7824 if (tp->t_rxtshift == 1 && 7825 (int)(ticks - tp->t_badrxtwin) < 0) 7826 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 7827 } 7828 SOCKBUF_LOCK(&so->so_snd); 7829 acked_amount = min(acked, (int)sbavail(&so->so_snd)); 7830 tp->snd_wnd -= acked_amount; 7831 mfree = sbcut_locked(&so->so_snd, acked_amount); 7832 /* NB: sowwakeup_locked() does an implicit unlock. */ 7833 sowwakeup_locked(so); 7834 m_freem(mfree); 7835 if (SEQ_GT(th->th_ack, tp->snd_una)) { 7836 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 7837 } 7838 tp->snd_una = th->th_ack; 7839 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, (bbr->r_ctl.rc_lost - lost)); 7840 if (IN_RECOVERY(tp->t_flags)) { 7841 if (SEQ_LT(th->th_ack, tp->snd_recover) && 7842 (SEQ_LT(th->th_ack, tp->snd_max))) { 7843 tcp_bbr_partialack(tp); 7844 } else { 7845 bbr_post_recovery(tp); 7846 } 7847 } 7848 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 7849 tp->snd_recover = tp->snd_una; 7850 } 7851 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 7852 tp->snd_nxt = tp->snd_max; 7853 } 7854 if (tp->snd_una == tp->snd_max) { 7855 /* Nothing left outstanding */ 7856 nothing_left: 7857 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 7858 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 7859 bbr->rc_tp->t_acktime = 0; 7860 if ((sbused(&so->so_snd) == 0) && 7861 (tp->t_flags & TF_SENTFIN)) { 7862 ourfinisacked = 1; 7863 } 7864 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 7865 if (bbr->rc_in_persist == 0) { 7866 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 7867 } 7868 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 7869 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 7870 /* 7871 * We invalidate the last ack here since we 7872 * don't want to transfer forward the time 7873 * for our sum's calculations. 7874 */ 7875 if ((tp->t_state >= TCPS_FIN_WAIT_1) && 7876 (sbavail(&so->so_snd) == 0) && 7877 (tp->t_flags2 & TF2_DROP_AF_DATA)) { 7878 /* 7879 * The socket was gone and the peer sent data, time 7880 * to reset him. 7881 */ 7882 *ret_val = 1; 7883 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE); 7884 /* tcp_close will kill the inp pre-log the Reset */ 7885 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 7886 tp = tcp_close(tp); 7887 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); 7888 BBR_STAT_INC(bbr_dropped_af_data); 7889 return (1); 7890 } 7891 /* Set need output so persist might get set */ 7892 bbr->r_wanted_output = 1; 7893 } 7894 if (ofia) 7895 *ofia = ourfinisacked; 7896 return (0); 7897 } 7898 7899 static void 7900 bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 7901 { 7902 if (bbr->rc_in_persist == 0) { 7903 bbr_timer_cancel(bbr, __LINE__, cts); 7904 bbr->r_ctl.rc_last_delay_val = 0; 7905 tp->t_rxtshift = 0; 7906 bbr->rc_in_persist = 1; 7907 bbr->r_ctl.rc_went_idle_time = cts; 7908 /* We should be capped when rw went to 0 but just in case */ 7909 bbr_log_type_pesist(bbr, cts, 0, line, 1); 7910 /* Time freezes for the state, so do the accounting now */ 7911 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 7912 uint32_t time_in; 7913 7914 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 7915 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 7916 int32_t idx; 7917 7918 idx = bbr_state_val(bbr); 7919 counter_u64_add(bbr_state_time[(idx + 5)], time_in); 7920 } else { 7921 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 7922 } 7923 } 7924 bbr->r_ctl.rc_bbr_state_time = cts; 7925 } 7926 } 7927 7928 static void 7929 bbr_restart_after_idle(struct tcp_bbr *bbr, uint32_t cts, uint32_t idle_time) 7930 { 7931 /* 7932 * Note that if idle time does not exceed our 7933 * threshold, we do nothing continuing the state 7934 * transitions we were last walking through. 7935 */ 7936 if (idle_time >= bbr_idle_restart_threshold) { 7937 if (bbr->rc_use_idle_restart) { 7938 bbr->rc_bbr_state = BBR_STATE_IDLE_EXIT; 7939 /* 7940 * Set our target using BBR_UNIT, so 7941 * we increase at a dramatic rate but 7942 * we stop when we get the pipe 7943 * full again for our current b/w estimate. 7944 */ 7945 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 7946 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 7947 bbr_set_state_target(bbr, __LINE__); 7948 /* Now setup our gains to ramp up */ 7949 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 7950 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 7951 bbr_log_type_statechange(bbr, cts, __LINE__); 7952 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 7953 bbr_substate_change(bbr, cts, __LINE__, 1); 7954 } 7955 } 7956 } 7957 7958 static void 7959 bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 7960 { 7961 uint32_t idle_time; 7962 7963 if (bbr->rc_in_persist == 0) 7964 return; 7965 idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time); 7966 bbr->rc_in_persist = 0; 7967 bbr->rc_hit_state_1 = 0; 7968 bbr->r_ctl.rc_del_time = cts; 7969 /* 7970 * We invalidate the last ack here since we 7971 * don't want to transfer forward the time 7972 * for our sum's calculations. 7973 */ 7974 if (bbr->rc_inp->inp_in_hpts) { 7975 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 7976 bbr->rc_timer_first = 0; 7977 bbr->r_ctl.rc_hpts_flags = 0; 7978 bbr->r_ctl.rc_last_delay_val = 0; 7979 bbr->r_ctl.rc_hptsi_agg_delay = 0; 7980 bbr->r_agg_early_set = 0; 7981 bbr->r_ctl.rc_agg_early = 0; 7982 } 7983 bbr_log_type_pesist(bbr, cts, idle_time, line, 0); 7984 if (idle_time >= bbr_rtt_probe_time) { 7985 /* 7986 * This qualifies as a RTT_PROBE session since we drop the 7987 * data outstanding to nothing and waited more than 7988 * bbr_rtt_probe_time. 7989 */ 7990 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0); 7991 bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts; 7992 } 7993 tp->t_rxtshift = 0; 7994 /* 7995 * If in probeBW and we have persisted more than an RTT lets do 7996 * special handling. 7997 */ 7998 /* Force a time based epoch */ 7999 bbr_set_epoch(bbr, cts, __LINE__); 8000 /* 8001 * Setup the lost so we don't count anything against the guy 8002 * we have been stuck with during persists. 8003 */ 8004 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 8005 /* Time un-freezes for the state */ 8006 bbr->r_ctl.rc_bbr_state_time = cts; 8007 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) || 8008 (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) { 8009 /* 8010 * If we are going back to probe-bw 8011 * or probe_rtt, we may need to possibly 8012 * do a fast restart. 8013 */ 8014 bbr_restart_after_idle(bbr, cts, idle_time); 8015 } 8016 } 8017 8018 static void 8019 bbr_collapsed_window(struct tcp_bbr *bbr) 8020 { 8021 /* 8022 * Now we must walk the 8023 * send map and divide the 8024 * ones left stranded. These 8025 * guys can't cause us to abort 8026 * the connection and are really 8027 * "unsent". However if a buggy 8028 * client actually did keep some 8029 * of the data i.e. collapsed the win 8030 * and refused to ack and then opened 8031 * the win and acked that data. We would 8032 * get into an ack war, the simplier 8033 * method then of just pretending we 8034 * did not send those segments something 8035 * won't work. 8036 */ 8037 struct bbr_sendmap *rsm, *nrsm; 8038 tcp_seq max_seq; 8039 uint32_t maxseg; 8040 int can_split = 0; 8041 int fnd = 0; 8042 8043 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 8044 max_seq = bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd; 8045 bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0); 8046 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 8047 /* Find the first seq past or at maxseq */ 8048 if (rsm->r_flags & BBR_RWND_COLLAPSED) 8049 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8050 if (SEQ_GEQ(max_seq, rsm->r_start) && 8051 SEQ_GEQ(rsm->r_end, max_seq)) { 8052 fnd = 1; 8053 break; 8054 } 8055 } 8056 bbr->rc_has_collapsed = 0; 8057 if (!fnd) { 8058 /* Nothing to do strange */ 8059 return; 8060 } 8061 /* 8062 * Now can we split? 8063 * 8064 * We don't want to split if splitting 8065 * would generate too many small segments 8066 * less we let an attacker fragment our 8067 * send_map and leave us out of memory. 8068 */ 8069 if ((max_seq != rsm->r_start) && 8070 (max_seq != rsm->r_end)){ 8071 /* can we split? */ 8072 int res1, res2; 8073 8074 res1 = max_seq - rsm->r_start; 8075 res2 = rsm->r_end - max_seq; 8076 if ((res1 >= (maxseg/8)) && 8077 (res2 >= (maxseg/8))) { 8078 /* No small pieces here */ 8079 can_split = 1; 8080 } else if (bbr->r_ctl.rc_num_small_maps_alloced < bbr_sack_block_limit) { 8081 /* We are under the limit */ 8082 can_split = 1; 8083 } 8084 } 8085 /* Ok do we need to split this rsm? */ 8086 if (max_seq == rsm->r_start) { 8087 /* It's this guy no split required */ 8088 nrsm = rsm; 8089 } else if (max_seq == rsm->r_end) { 8090 /* It's the next one no split required. */ 8091 nrsm = TAILQ_NEXT(rsm, r_next); 8092 if (nrsm == NULL) { 8093 /* Huh? */ 8094 return; 8095 } 8096 } else if (can_split && SEQ_LT(max_seq, rsm->r_end)) { 8097 /* yep we need to split it */ 8098 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 8099 if (nrsm == NULL) { 8100 /* failed XXXrrs what can we do mark the whole? */ 8101 nrsm = rsm; 8102 goto no_split; 8103 } 8104 /* Clone it */ 8105 bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0); 8106 bbr_clone_rsm(bbr, nrsm, rsm, max_seq); 8107 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 8108 if (rsm->r_in_tmap) { 8109 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 8110 nrsm->r_in_tmap = 1; 8111 } 8112 } else { 8113 /* 8114 * Split not allowed just start here just 8115 * use this guy. 8116 */ 8117 nrsm = rsm; 8118 } 8119 no_split: 8120 BBR_STAT_INC(bbr_collapsed_win); 8121 /* reuse fnd as a count */ 8122 fnd = 0; 8123 TAILQ_FOREACH_FROM(nrsm, &bbr->r_ctl.rc_map, r_next) { 8124 nrsm->r_flags |= BBR_RWND_COLLAPSED; 8125 fnd++; 8126 bbr->rc_has_collapsed = 1; 8127 } 8128 bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd); 8129 } 8130 8131 static void 8132 bbr_un_collapse_window(struct tcp_bbr *bbr) 8133 { 8134 struct bbr_sendmap *rsm; 8135 int cleared = 0; 8136 8137 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 8138 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 8139 /* Clear the flag */ 8140 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8141 cleared++; 8142 } else 8143 break; 8144 } 8145 bbr_log_type_rwnd_collapse(bbr, 8146 (bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd), 0, cleared); 8147 bbr->rc_has_collapsed = 0; 8148 } 8149 8150 /* 8151 * Return value of 1, the TCB is unlocked and most 8152 * likely gone, return value of 0, the TCB is still 8153 * locked. 8154 */ 8155 static int 8156 bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, 8157 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, 8158 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 8159 { 8160 /* 8161 * Update window information. Don't look at window if no ACK: TAC's 8162 * send garbage on first SYN. 8163 */ 8164 uint16_t nsegs; 8165 int32_t tfo_syn; 8166 struct tcp_bbr *bbr; 8167 8168 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8169 INP_WLOCK_ASSERT(tp->t_inpcb); 8170 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8171 if ((thflags & TH_ACK) && 8172 (SEQ_LT(tp->snd_wl1, th->th_seq) || 8173 (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) || 8174 (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) { 8175 /* keep track of pure window updates */ 8176 if (tlen == 0 && 8177 tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd) 8178 KMOD_TCPSTAT_INC(tcps_rcvwinupd); 8179 tp->snd_wnd = tiwin; 8180 tp->snd_wl1 = th->th_seq; 8181 tp->snd_wl2 = th->th_ack; 8182 if (tp->snd_wnd > tp->max_sndwnd) 8183 tp->max_sndwnd = tp->snd_wnd; 8184 bbr->r_wanted_output = 1; 8185 } else if (thflags & TH_ACK) { 8186 if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) { 8187 tp->snd_wnd = tiwin; 8188 tp->snd_wl1 = th->th_seq; 8189 tp->snd_wl2 = th->th_ack; 8190 } 8191 } 8192 if (tp->snd_wnd < ctf_outstanding(tp)) 8193 /* The peer collapsed its window on us */ 8194 bbr_collapsed_window(bbr); 8195 else if (bbr->rc_has_collapsed) 8196 bbr_un_collapse_window(bbr); 8197 /* Was persist timer active and now we have window space? */ 8198 if ((bbr->rc_in_persist != 0) && 8199 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8200 bbr_minseg(bbr)))) { 8201 /* 8202 * Make the rate persist at end of persist mode if idle long 8203 * enough 8204 */ 8205 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8206 8207 /* Make sure we output to start the timer */ 8208 bbr->r_wanted_output = 1; 8209 } 8210 /* Do we need to enter persist? */ 8211 if ((bbr->rc_in_persist == 0) && 8212 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8213 TCPS_HAVEESTABLISHED(tp->t_state) && 8214 (tp->snd_max == tp->snd_una) && 8215 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8216 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8217 /* No send window.. we must enter persist */ 8218 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8219 } 8220 if (tp->t_flags2 & TF2_DROP_AF_DATA) { 8221 m_freem(m); 8222 return (0); 8223 } 8224 /* 8225 * We don't support urgent data but 8226 * drag along the up just to make sure 8227 * if there is a stack switch no one 8228 * is surprised. 8229 */ 8230 tp->rcv_up = tp->rcv_nxt; 8231 INP_WLOCK_ASSERT(tp->t_inpcb); 8232 8233 /* 8234 * Process the segment text, merging it into the TCP sequencing 8235 * queue, and arranging for acknowledgment of receipt if necessary. 8236 * This process logically involves adjusting tp->rcv_wnd as data is 8237 * presented to the user (this happens in tcp_usrreq.c, case 8238 * PRU_RCVD). If a FIN has already been received on this connection 8239 * then we just ignore the text. 8240 */ 8241 tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) && 8242 IS_FASTOPEN(tp->t_flags)); 8243 if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) && 8244 TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8245 tcp_seq save_start = th->th_seq; 8246 tcp_seq save_rnxt = tp->rcv_nxt; 8247 int save_tlen = tlen; 8248 8249 m_adj(m, drop_hdrlen); /* delayed header drop */ 8250 /* 8251 * Insert segment which includes th into TCP reassembly 8252 * queue with control block tp. Set thflags to whether 8253 * reassembly now includes a segment with FIN. This handles 8254 * the common case inline (segment is the next to be 8255 * received on an established connection, and the queue is 8256 * empty), avoiding linkage into and removal from the queue 8257 * and repetition of various conversions. Set DELACK for 8258 * segments received in order, but ack immediately when 8259 * segments are out of order (so fast retransmit can work). 8260 */ 8261 if (th->th_seq == tp->rcv_nxt && 8262 SEGQ_EMPTY(tp) && 8263 (TCPS_HAVEESTABLISHED(tp->t_state) || 8264 tfo_syn)) { 8265 #ifdef NETFLIX_SB_LIMITS 8266 u_int mcnt, appended; 8267 8268 if (so->so_rcv.sb_shlim) { 8269 mcnt = m_memcnt(m); 8270 appended = 0; 8271 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8272 CFO_NOSLEEP, NULL) == false) { 8273 counter_u64_add(tcp_sb_shlim_fails, 1); 8274 m_freem(m); 8275 return (0); 8276 } 8277 } 8278 8279 #endif 8280 if (DELAY_ACK(tp, bbr, nsegs) || tfo_syn) { 8281 bbr->bbr_segs_rcvd += max(1, nsegs); 8282 tp->t_flags |= TF_DELACK; 8283 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8284 } else { 8285 bbr->r_wanted_output = 1; 8286 tp->t_flags |= TF_ACKNOW; 8287 } 8288 tp->rcv_nxt += tlen; 8289 if (tlen && 8290 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 8291 (tp->t_fbyte_in == 0)) { 8292 tp->t_fbyte_in = ticks; 8293 if (tp->t_fbyte_in == 0) 8294 tp->t_fbyte_in = 1; 8295 if (tp->t_fbyte_out && tp->t_fbyte_in) 8296 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 8297 } 8298 thflags = th->th_flags & TH_FIN; 8299 KMOD_TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8300 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen); 8301 SOCKBUF_LOCK(&so->so_rcv); 8302 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) 8303 m_freem(m); 8304 else 8305 #ifdef NETFLIX_SB_LIMITS 8306 appended = 8307 #endif 8308 sbappendstream_locked(&so->so_rcv, m, 0); 8309 /* NB: sorwakeup_locked() does an implicit unlock. */ 8310 sorwakeup_locked(so); 8311 #ifdef NETFLIX_SB_LIMITS 8312 if (so->so_rcv.sb_shlim && appended != mcnt) 8313 counter_fo_release(so->so_rcv.sb_shlim, 8314 mcnt - appended); 8315 #endif 8316 8317 } else { 8318 /* 8319 * XXX: Due to the header drop above "th" is 8320 * theoretically invalid by now. Fortunately 8321 * m_adj() doesn't actually frees any mbufs when 8322 * trimming from the head. 8323 */ 8324 tcp_seq temp = save_start; 8325 8326 thflags = tcp_reass(tp, th, &temp, &tlen, m); 8327 tp->t_flags |= TF_ACKNOW; 8328 if (tp->t_flags & TF_WAKESOR) { 8329 tp->t_flags &= ~TF_WAKESOR; 8330 /* NB: sorwakeup_locked() does an implicit unlock. */ 8331 sorwakeup_locked(so); 8332 } 8333 } 8334 if ((tp->t_flags & TF_SACK_PERMIT) && 8335 (save_tlen > 0) && 8336 TCPS_HAVEESTABLISHED(tp->t_state)) { 8337 if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { 8338 /* 8339 * DSACK actually handled in the fastpath 8340 * above. 8341 */ 8342 tcp_update_sack_list(tp, save_start, 8343 save_start + save_tlen); 8344 } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { 8345 if ((tp->rcv_numsacks >= 1) && 8346 (tp->sackblks[0].end == save_start)) { 8347 /* 8348 * Partial overlap, recorded at todrop 8349 * above. 8350 */ 8351 tcp_update_sack_list(tp, 8352 tp->sackblks[0].start, 8353 tp->sackblks[0].end); 8354 } else { 8355 tcp_update_dsack_list(tp, save_start, 8356 save_start + save_tlen); 8357 } 8358 } else if (tlen >= save_tlen) { 8359 /* Update of sackblks. */ 8360 tcp_update_dsack_list(tp, save_start, 8361 save_start + save_tlen); 8362 } else if (tlen > 0) { 8363 tcp_update_dsack_list(tp, save_start, 8364 save_start + tlen); 8365 } 8366 } 8367 } else { 8368 m_freem(m); 8369 thflags &= ~TH_FIN; 8370 } 8371 8372 /* 8373 * If FIN is received ACK the FIN and let the user know that the 8374 * connection is closing. 8375 */ 8376 if (thflags & TH_FIN) { 8377 if (TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8378 /* The socket upcall is handled by socantrcvmore. */ 8379 socantrcvmore(so); 8380 /* 8381 * If connection is half-synchronized (ie NEEDSYN 8382 * flag on) then delay ACK, so it may be piggybacked 8383 * when SYN is sent. Otherwise, since we received a 8384 * FIN then no more input can be expected, send ACK 8385 * now. 8386 */ 8387 if (tp->t_flags & TF_NEEDSYN) { 8388 tp->t_flags |= TF_DELACK; 8389 bbr_timer_cancel(bbr, 8390 __LINE__, bbr->r_ctl.rc_rcvtime); 8391 } else { 8392 tp->t_flags |= TF_ACKNOW; 8393 } 8394 tp->rcv_nxt++; 8395 } 8396 switch (tp->t_state) { 8397 /* 8398 * In SYN_RECEIVED and ESTABLISHED STATES enter the 8399 * CLOSE_WAIT state. 8400 */ 8401 case TCPS_SYN_RECEIVED: 8402 tp->t_starttime = ticks; 8403 /* FALLTHROUGH */ 8404 case TCPS_ESTABLISHED: 8405 tcp_state_change(tp, TCPS_CLOSE_WAIT); 8406 break; 8407 8408 /* 8409 * If still in FIN_WAIT_1 STATE FIN has not been 8410 * acked so enter the CLOSING state. 8411 */ 8412 case TCPS_FIN_WAIT_1: 8413 tcp_state_change(tp, TCPS_CLOSING); 8414 break; 8415 8416 /* 8417 * In FIN_WAIT_2 state enter the TIME_WAIT state, 8418 * starting the time-wait timer, turning off the 8419 * other standard timers. 8420 */ 8421 case TCPS_FIN_WAIT_2: 8422 bbr->rc_timer_first = 1; 8423 bbr_timer_cancel(bbr, 8424 __LINE__, bbr->r_ctl.rc_rcvtime); 8425 INP_WLOCK_ASSERT(tp->t_inpcb); 8426 tcp_twstart(tp); 8427 return (1); 8428 } 8429 } 8430 /* 8431 * Return any desired output. 8432 */ 8433 if ((tp->t_flags & TF_ACKNOW) || 8434 (sbavail(&so->so_snd) > ctf_outstanding(tp))) { 8435 bbr->r_wanted_output = 1; 8436 } 8437 INP_WLOCK_ASSERT(tp->t_inpcb); 8438 return (0); 8439 } 8440 8441 /* 8442 * Here nothing is really faster, its just that we 8443 * have broken out the fast-data path also just like 8444 * the fast-ack. Return 1 if we processed the packet 8445 * return 0 if you need to take the "slow-path". 8446 */ 8447 static int 8448 bbr_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, 8449 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8450 uint32_t tiwin, int32_t nxt_pkt) 8451 { 8452 uint16_t nsegs; 8453 int32_t newsize = 0; /* automatic sockbuf scaling */ 8454 struct tcp_bbr *bbr; 8455 #ifdef NETFLIX_SB_LIMITS 8456 u_int mcnt, appended; 8457 #endif 8458 #ifdef TCPDEBUG 8459 /* 8460 * The size of tcp_saveipgen must be the size of the max ip header, 8461 * now IPv6. 8462 */ 8463 u_char tcp_saveipgen[IP6_HDR_LEN]; 8464 struct tcphdr tcp_savetcp; 8465 short ostate = 0; 8466 8467 #endif 8468 /* On the hpts and we would have called output */ 8469 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8470 8471 /* 8472 * If last ACK falls within this segment's sequence numbers, record 8473 * the timestamp. NOTE that the test is modified according to the 8474 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8475 */ 8476 if (bbr->r_ctl.rc_resend != NULL) { 8477 return (0); 8478 } 8479 if (tiwin && tiwin != tp->snd_wnd) { 8480 return (0); 8481 } 8482 if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) { 8483 return (0); 8484 } 8485 if (__predict_false((to->to_flags & TOF_TS) && 8486 (TSTMP_LT(to->to_tsval, tp->ts_recent)))) { 8487 return (0); 8488 } 8489 if (__predict_false((th->th_ack != tp->snd_una))) { 8490 return (0); 8491 } 8492 if (__predict_false(tlen > sbspace(&so->so_rcv))) { 8493 return (0); 8494 } 8495 if ((to->to_flags & TOF_TS) != 0 && 8496 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8497 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 8498 tp->ts_recent = to->to_tsval; 8499 } 8500 /* 8501 * This is a pure, in-sequence data packet with nothing on the 8502 * reassembly queue and we have enough buffer space to take it. 8503 */ 8504 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8505 8506 #ifdef NETFLIX_SB_LIMITS 8507 if (so->so_rcv.sb_shlim) { 8508 mcnt = m_memcnt(m); 8509 appended = 0; 8510 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8511 CFO_NOSLEEP, NULL) == false) { 8512 counter_u64_add(tcp_sb_shlim_fails, 1); 8513 m_freem(m); 8514 return (1); 8515 } 8516 } 8517 #endif 8518 /* Clean receiver SACK report if present */ 8519 if (tp->rcv_numsacks) 8520 tcp_clean_sackreport(tp); 8521 KMOD_TCPSTAT_INC(tcps_preddat); 8522 tp->rcv_nxt += tlen; 8523 if (tlen && 8524 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 8525 (tp->t_fbyte_in == 0)) { 8526 tp->t_fbyte_in = ticks; 8527 if (tp->t_fbyte_in == 0) 8528 tp->t_fbyte_in = 1; 8529 if (tp->t_fbyte_out && tp->t_fbyte_in) 8530 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 8531 } 8532 /* 8533 * Pull snd_wl1 up to prevent seq wrap relative to th_seq. 8534 */ 8535 tp->snd_wl1 = th->th_seq; 8536 /* 8537 * Pull rcv_up up to prevent seq wrap relative to rcv_nxt. 8538 */ 8539 tp->rcv_up = tp->rcv_nxt; 8540 KMOD_TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8541 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen); 8542 #ifdef TCPDEBUG 8543 if (so->so_options & SO_DEBUG) 8544 tcp_trace(TA_INPUT, ostate, tp, 8545 (void *)tcp_saveipgen, &tcp_savetcp, 0); 8546 #endif 8547 newsize = tcp_autorcvbuf(m, th, so, tp, tlen); 8548 8549 /* Add data to socket buffer. */ 8550 SOCKBUF_LOCK(&so->so_rcv); 8551 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 8552 m_freem(m); 8553 } else { 8554 /* 8555 * Set new socket buffer size. Give up when limit is 8556 * reached. 8557 */ 8558 if (newsize) 8559 if (!sbreserve_locked(&so->so_rcv, 8560 newsize, so, NULL)) 8561 so->so_rcv.sb_flags &= ~SB_AUTOSIZE; 8562 m_adj(m, drop_hdrlen); /* delayed header drop */ 8563 8564 #ifdef NETFLIX_SB_LIMITS 8565 appended = 8566 #endif 8567 sbappendstream_locked(&so->so_rcv, m, 0); 8568 ctf_calc_rwin(so, tp); 8569 } 8570 /* NB: sorwakeup_locked() does an implicit unlock. */ 8571 sorwakeup_locked(so); 8572 #ifdef NETFLIX_SB_LIMITS 8573 if (so->so_rcv.sb_shlim && mcnt != appended) 8574 counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended); 8575 #endif 8576 if (DELAY_ACK(tp, bbr, nsegs)) { 8577 bbr->bbr_segs_rcvd += max(1, nsegs); 8578 tp->t_flags |= TF_DELACK; 8579 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8580 } else { 8581 bbr->r_wanted_output = 1; 8582 tp->t_flags |= TF_ACKNOW; 8583 } 8584 return (1); 8585 } 8586 8587 /* 8588 * This subfunction is used to try to highly optimize the 8589 * fast path. We again allow window updates that are 8590 * in sequence to remain in the fast-path. We also add 8591 * in the __predict's to attempt to help the compiler. 8592 * Note that if we return a 0, then we can *not* process 8593 * it and the caller should push the packet into the 8594 * slow-path. If we return 1, then all is well and 8595 * the packet is fully processed. 8596 */ 8597 static int 8598 bbr_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 8599 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8600 uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos) 8601 { 8602 int32_t acked; 8603 uint16_t nsegs; 8604 uint32_t sack_changed; 8605 #ifdef TCPDEBUG 8606 /* 8607 * The size of tcp_saveipgen must be the size of the max ip header, 8608 * now IPv6. 8609 */ 8610 u_char tcp_saveipgen[IP6_HDR_LEN]; 8611 struct tcphdr tcp_savetcp; 8612 short ostate = 0; 8613 8614 #endif 8615 uint32_t prev_acked = 0; 8616 struct tcp_bbr *bbr; 8617 8618 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 8619 /* Old ack, behind (or duplicate to) the last one rcv'd */ 8620 return (0); 8621 } 8622 if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) { 8623 /* Above what we have sent? */ 8624 return (0); 8625 } 8626 if (__predict_false(tiwin == 0)) { 8627 /* zero window */ 8628 return (0); 8629 } 8630 if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) { 8631 /* We need a SYN or a FIN, unlikely.. */ 8632 return (0); 8633 } 8634 if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) { 8635 /* Timestamp is behind .. old ack with seq wrap? */ 8636 return (0); 8637 } 8638 if (__predict_false(IN_RECOVERY(tp->t_flags))) { 8639 /* Still recovering */ 8640 return (0); 8641 } 8642 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8643 if (__predict_false(bbr->r_ctl.rc_resend != NULL)) { 8644 /* We are retransmitting */ 8645 return (0); 8646 } 8647 if (__predict_false(bbr->rc_in_persist != 0)) { 8648 /* In persist mode */ 8649 return (0); 8650 } 8651 if (bbr->r_ctl.rc_sacked) { 8652 /* We have sack holes on our scoreboard */ 8653 return (0); 8654 } 8655 /* Ok if we reach here, we can process a fast-ack */ 8656 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8657 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 8658 /* 8659 * We never detect loss in fast ack [we can't 8660 * have a sack and can't be in recovery so 8661 * we always pass 0 (nothing detected)]. 8662 */ 8663 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, 0); 8664 /* Did the window get updated? */ 8665 if (tiwin != tp->snd_wnd) { 8666 tp->snd_wnd = tiwin; 8667 tp->snd_wl1 = th->th_seq; 8668 if (tp->snd_wnd > tp->max_sndwnd) 8669 tp->max_sndwnd = tp->snd_wnd; 8670 } 8671 /* Do we need to exit persists? */ 8672 if ((bbr->rc_in_persist != 0) && 8673 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8674 bbr_minseg(bbr)))) { 8675 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8676 bbr->r_wanted_output = 1; 8677 } 8678 /* Do we need to enter persists? */ 8679 if ((bbr->rc_in_persist == 0) && 8680 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8681 TCPS_HAVEESTABLISHED(tp->t_state) && 8682 (tp->snd_max == tp->snd_una) && 8683 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8684 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8685 /* No send window.. we must enter persist */ 8686 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8687 } 8688 /* 8689 * If last ACK falls within this segment's sequence numbers, record 8690 * the timestamp. NOTE that the test is modified according to the 8691 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8692 */ 8693 if ((to->to_flags & TOF_TS) != 0 && 8694 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8695 tp->ts_recent_age = bbr->r_ctl.rc_rcvtime; 8696 tp->ts_recent = to->to_tsval; 8697 } 8698 /* 8699 * This is a pure ack for outstanding data. 8700 */ 8701 KMOD_TCPSTAT_INC(tcps_predack); 8702 8703 /* 8704 * "bad retransmit" recovery. 8705 */ 8706 if (tp->t_flags & TF_PREVVALID) { 8707 tp->t_flags &= ~TF_PREVVALID; 8708 if (tp->t_rxtshift == 1 && 8709 (int)(ticks - tp->t_badrxtwin) < 0) 8710 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 8711 } 8712 /* 8713 * Recalculate the transmit timer / rtt. 8714 * 8715 * Some boxes send broken timestamp replies during the SYN+ACK 8716 * phase, ignore timestamps of 0 or we could calculate a huge RTT 8717 * and blow up the retransmit timer. 8718 */ 8719 acked = BYTES_THIS_ACK(tp, th); 8720 8721 #ifdef TCP_HHOOK 8722 /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */ 8723 hhook_run_tcp_est_in(tp, th, to); 8724 #endif 8725 8726 KMOD_TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 8727 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked); 8728 sbdrop(&so->so_snd, acked); 8729 8730 if (SEQ_GT(th->th_ack, tp->snd_una)) 8731 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 8732 tp->snd_una = th->th_ack; 8733 if (tp->snd_wnd < ctf_outstanding(tp)) 8734 /* The peer collapsed its window on us */ 8735 bbr_collapsed_window(bbr); 8736 else if (bbr->rc_has_collapsed) 8737 bbr_un_collapse_window(bbr); 8738 8739 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 8740 tp->snd_recover = tp->snd_una; 8741 } 8742 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, 0); 8743 /* 8744 * Pull snd_wl2 up to prevent seq wrap relative to th_ack. 8745 */ 8746 tp->snd_wl2 = th->th_ack; 8747 m_freem(m); 8748 /* 8749 * If all outstanding data are acked, stop retransmit timer, 8750 * otherwise restart timer using current (possibly backed-off) 8751 * value. If process is waiting for space, wakeup/selwakeup/signal. 8752 * If data are ready to send, let tcp_output decide between more 8753 * output or persist. 8754 */ 8755 #ifdef TCPDEBUG 8756 if (so->so_options & SO_DEBUG) 8757 tcp_trace(TA_INPUT, ostate, tp, 8758 (void *)tcp_saveipgen, 8759 &tcp_savetcp, 0); 8760 #endif 8761 /* Wake up the socket if we have room to write more */ 8762 sowwakeup(so); 8763 if (tp->snd_una == tp->snd_max) { 8764 /* Nothing left outstanding */ 8765 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 8766 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 8767 bbr->rc_tp->t_acktime = 0; 8768 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8769 if (bbr->rc_in_persist == 0) { 8770 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 8771 } 8772 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 8773 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 8774 /* 8775 * We invalidate the last ack here since we 8776 * don't want to transfer forward the time 8777 * for our sum's calculations. 8778 */ 8779 bbr->r_wanted_output = 1; 8780 } 8781 if (sbavail(&so->so_snd)) { 8782 bbr->r_wanted_output = 1; 8783 } 8784 return (1); 8785 } 8786 8787 /* 8788 * Return value of 1, the TCB is unlocked and most 8789 * likely gone, return value of 0, the TCB is still 8790 * locked. 8791 */ 8792 static int 8793 bbr_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, 8794 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8795 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 8796 { 8797 int32_t todrop; 8798 int32_t ourfinisacked = 0; 8799 struct tcp_bbr *bbr; 8800 int32_t ret_val = 0; 8801 8802 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8803 ctf_calc_rwin(so, tp); 8804 /* 8805 * If the state is SYN_SENT: if seg contains an ACK, but not for our 8806 * SYN, drop the input. if seg contains a RST, then drop the 8807 * connection. if seg does not contain SYN, then drop it. Otherwise 8808 * this is an acceptable SYN segment initialize tp->rcv_nxt and 8809 * tp->irs if seg contains ack then advance tp->snd_una. BRR does 8810 * not support ECN so we will not say we are capable. if SYN has 8811 * been acked change to ESTABLISHED else SYN_RCVD state arrange for 8812 * segment to be acked (eventually) continue processing rest of 8813 * data/controls, beginning with URG 8814 */ 8815 if ((thflags & TH_ACK) && 8816 (SEQ_LEQ(th->th_ack, tp->iss) || 8817 SEQ_GT(th->th_ack, tp->snd_max))) { 8818 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 8819 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 8820 return (1); 8821 } 8822 if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) { 8823 TCP_PROBE5(connect__refused, NULL, tp, 8824 mtod(m, const char *), tp, th); 8825 tp = tcp_drop(tp, ECONNREFUSED); 8826 ctf_do_drop(m, tp); 8827 return (1); 8828 } 8829 if (thflags & TH_RST) { 8830 ctf_do_drop(m, tp); 8831 return (1); 8832 } 8833 if (!(thflags & TH_SYN)) { 8834 ctf_do_drop(m, tp); 8835 return (1); 8836 } 8837 tp->irs = th->th_seq; 8838 tcp_rcvseqinit(tp); 8839 if (thflags & TH_ACK) { 8840 int tfo_partial = 0; 8841 8842 KMOD_TCPSTAT_INC(tcps_connects); 8843 soisconnected(so); 8844 #ifdef MAC 8845 mac_socketpeer_set_from_mbuf(m, so); 8846 #endif 8847 /* Do window scaling on this connection? */ 8848 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 8849 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 8850 tp->rcv_scale = tp->request_r_scale; 8851 } 8852 tp->rcv_adv += min(tp->rcv_wnd, 8853 TCP_MAXWIN << tp->rcv_scale); 8854 /* 8855 * If not all the data that was sent in the TFO SYN 8856 * has been acked, resend the remainder right away. 8857 */ 8858 if (IS_FASTOPEN(tp->t_flags) && 8859 (tp->snd_una != tp->snd_max)) { 8860 tp->snd_nxt = th->th_ack; 8861 tfo_partial = 1; 8862 } 8863 /* 8864 * If there's data, delay ACK; if there's also a FIN ACKNOW 8865 * will be turned on later. 8866 */ 8867 if (DELAY_ACK(tp, bbr, 1) && tlen != 0 && !tfo_partial) { 8868 bbr->bbr_segs_rcvd += 1; 8869 tp->t_flags |= TF_DELACK; 8870 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8871 } else { 8872 bbr->r_wanted_output = 1; 8873 tp->t_flags |= TF_ACKNOW; 8874 } 8875 if (SEQ_GT(th->th_ack, tp->iss)) { 8876 /* 8877 * The SYN is acked 8878 * handle it specially. 8879 */ 8880 bbr_log_syn(tp, to); 8881 } 8882 if (SEQ_GT(th->th_ack, tp->snd_una)) { 8883 /* 8884 * We advance snd_una for the 8885 * fast open case. If th_ack is 8886 * acknowledging data beyond 8887 * snd_una we can't just call 8888 * ack-processing since the 8889 * data stream in our send-map 8890 * will start at snd_una + 1 (one 8891 * beyond the SYN). If its just 8892 * equal we don't need to do that 8893 * and there is no send_map. 8894 */ 8895 tp->snd_una++; 8896 } 8897 /* 8898 * Received <SYN,ACK> in SYN_SENT[*] state. Transitions: 8899 * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1 8900 */ 8901 tp->t_starttime = ticks; 8902 if (tp->t_flags & TF_NEEDFIN) { 8903 tcp_state_change(tp, TCPS_FIN_WAIT_1); 8904 tp->t_flags &= ~TF_NEEDFIN; 8905 thflags &= ~TH_SYN; 8906 } else { 8907 tcp_state_change(tp, TCPS_ESTABLISHED); 8908 TCP_PROBE5(connect__established, NULL, tp, 8909 mtod(m, const char *), tp, th); 8910 cc_conn_init(tp); 8911 } 8912 } else { 8913 /* 8914 * Received initial SYN in SYN-SENT[*] state => simultaneous 8915 * open. If segment contains CC option and there is a 8916 * cached CC, apply TAO test. If it succeeds, connection is * 8917 * half-synchronized. Otherwise, do 3-way handshake: 8918 * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If 8919 * there was no CC option, clear cached CC value. 8920 */ 8921 tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN); 8922 tcp_state_change(tp, TCPS_SYN_RECEIVED); 8923 } 8924 INP_WLOCK_ASSERT(tp->t_inpcb); 8925 /* 8926 * Advance th->th_seq to correspond to first data byte. If data, 8927 * trim to stay within window, dropping FIN if necessary. 8928 */ 8929 th->th_seq++; 8930 if (tlen > tp->rcv_wnd) { 8931 todrop = tlen - tp->rcv_wnd; 8932 m_adj(m, -todrop); 8933 tlen = tp->rcv_wnd; 8934 thflags &= ~TH_FIN; 8935 KMOD_TCPSTAT_INC(tcps_rcvpackafterwin); 8936 KMOD_TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop); 8937 } 8938 tp->snd_wl1 = th->th_seq - 1; 8939 tp->rcv_up = th->th_seq; 8940 /* 8941 * Client side of transaction: already sent SYN and data. If the 8942 * remote host used T/TCP to validate the SYN, our data will be 8943 * ACK'd; if so, enter normal data segment processing in the middle 8944 * of step 5, ack processing. Otherwise, goto step 6. 8945 */ 8946 if (thflags & TH_ACK) { 8947 if ((to->to_flags & TOF_TS) != 0) { 8948 uint32_t t, rtt; 8949 8950 t = tcp_tv_to_mssectick(&bbr->rc_tv); 8951 if (TSTMP_GEQ(t, to->to_tsecr)) { 8952 rtt = t - to->to_tsecr; 8953 if (rtt == 0) { 8954 rtt = 1; 8955 } 8956 rtt *= MS_IN_USEC; 8957 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 8958 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, 8959 rtt, bbr->r_ctl.rc_rcvtime); 8960 } 8961 } 8962 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) 8963 return (ret_val); 8964 /* We may have changed to FIN_WAIT_1 above */ 8965 if (tp->t_state == TCPS_FIN_WAIT_1) { 8966 /* 8967 * In FIN_WAIT_1 STATE in addition to the processing 8968 * for the ESTABLISHED state if our FIN is now 8969 * acknowledged then enter FIN_WAIT_2. 8970 */ 8971 if (ourfinisacked) { 8972 /* 8973 * If we can't receive any more data, then 8974 * closing user can proceed. Starting the 8975 * timer is contrary to the specification, 8976 * but if we don't get a FIN we'll hang 8977 * forever. 8978 * 8979 * XXXjl: we should release the tp also, and 8980 * use a compressed state. 8981 */ 8982 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 8983 soisdisconnected(so); 8984 tcp_timer_activate(tp, TT_2MSL, 8985 (tcp_fast_finwait2_recycle ? 8986 tcp_finwait2_timeout : 8987 TP_MAXIDLE(tp))); 8988 } 8989 tcp_state_change(tp, TCPS_FIN_WAIT_2); 8990 } 8991 } 8992 } 8993 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 8994 tiwin, thflags, nxt_pkt)); 8995 } 8996 8997 /* 8998 * Return value of 1, the TCB is unlocked and most 8999 * likely gone, return value of 0, the TCB is still 9000 * locked. 9001 */ 9002 static int 9003 bbr_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, 9004 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9005 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9006 { 9007 int32_t ourfinisacked = 0; 9008 int32_t ret_val; 9009 struct tcp_bbr *bbr; 9010 9011 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9012 ctf_calc_rwin(so, tp); 9013 if ((thflags & TH_ACK) && 9014 (SEQ_LEQ(th->th_ack, tp->snd_una) || 9015 SEQ_GT(th->th_ack, tp->snd_max))) { 9016 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9017 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9018 return (1); 9019 } 9020 if (IS_FASTOPEN(tp->t_flags)) { 9021 /* 9022 * When a TFO connection is in SYN_RECEIVED, the only valid 9023 * packets are the initial SYN, a retransmit/copy of the 9024 * initial SYN (possibly with a subset of the original 9025 * data), a valid ACK, a FIN, or a RST. 9026 */ 9027 if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) { 9028 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9029 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9030 return (1); 9031 } else if (thflags & TH_SYN) { 9032 /* non-initial SYN is ignored */ 9033 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RXT) || 9034 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_TLP) || 9035 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) { 9036 ctf_do_drop(m, NULL); 9037 return (0); 9038 } 9039 } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) { 9040 ctf_do_drop(m, NULL); 9041 return (0); 9042 } 9043 } 9044 if ((thflags & TH_RST) || 9045 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9046 return (ctf_process_rst(m, th, so, tp)); 9047 /* 9048 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9049 * it's less than ts_recent, drop it. 9050 */ 9051 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9052 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9053 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9054 return (ret_val); 9055 } 9056 /* 9057 * In the SYN-RECEIVED state, validate that the packet belongs to 9058 * this connection before trimming the data to fit the receive 9059 * window. Check the sequence number versus IRS since we know the 9060 * sequence numbers haven't wrapped. This is a partial fix for the 9061 * "LAND" DoS attack. 9062 */ 9063 if (SEQ_LT(th->th_seq, tp->irs)) { 9064 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9065 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9066 return (1); 9067 } 9068 INP_WLOCK_ASSERT(tp->t_inpcb); 9069 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9070 return (ret_val); 9071 } 9072 /* 9073 * If last ACK falls within this segment's sequence numbers, record 9074 * its timestamp. NOTE: 1) That the test incorporates suggestions 9075 * from the latest proposal of the tcplw@cray.com list (Braden 9076 * 1993/04/26). 2) That updating only on newer timestamps interferes 9077 * with our earlier PAWS tests, so this check should be solely 9078 * predicated on the sequence space of this segment. 3) That we 9079 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9080 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9081 * SEG.Len, This modified check allows us to overcome RFC1323's 9082 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9083 * p.869. In such cases, we can still calculate the RTT correctly 9084 * when RCV.NXT == Last.ACK.Sent. 9085 */ 9086 if ((to->to_flags & TOF_TS) != 0 && 9087 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9088 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9089 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9090 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9091 tp->ts_recent = to->to_tsval; 9092 } 9093 tp->snd_wnd = tiwin; 9094 /* 9095 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9096 * is on (half-synchronized state), then queue data for later 9097 * processing; else drop segment and return. 9098 */ 9099 if ((thflags & TH_ACK) == 0) { 9100 if (IS_FASTOPEN(tp->t_flags)) { 9101 cc_conn_init(tp); 9102 } 9103 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9104 tiwin, thflags, nxt_pkt)); 9105 } 9106 KMOD_TCPSTAT_INC(tcps_connects); 9107 soisconnected(so); 9108 /* Do window scaling? */ 9109 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 9110 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 9111 tp->rcv_scale = tp->request_r_scale; 9112 } 9113 /* 9114 * ok for the first time in lets see if we can use the ts to figure 9115 * out what the initial RTT was. 9116 */ 9117 if ((to->to_flags & TOF_TS) != 0) { 9118 uint32_t t, rtt; 9119 9120 t = tcp_tv_to_mssectick(&bbr->rc_tv); 9121 if (TSTMP_GEQ(t, to->to_tsecr)) { 9122 rtt = t - to->to_tsecr; 9123 if (rtt == 0) { 9124 rtt = 1; 9125 } 9126 rtt *= MS_IN_USEC; 9127 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 9128 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, bbr->r_ctl.rc_rcvtime); 9129 } 9130 } 9131 /* Drop off any SYN in the send map (probably not there) */ 9132 if (thflags & TH_ACK) 9133 bbr_log_syn(tp, to); 9134 if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) { 9135 tcp_fastopen_decrement_counter(tp->t_tfo_pending); 9136 tp->t_tfo_pending = NULL; 9137 } 9138 /* 9139 * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* -> 9140 * FIN-WAIT-1 9141 */ 9142 tp->t_starttime = ticks; 9143 if (tp->t_flags & TF_NEEDFIN) { 9144 tcp_state_change(tp, TCPS_FIN_WAIT_1); 9145 tp->t_flags &= ~TF_NEEDFIN; 9146 } else { 9147 tcp_state_change(tp, TCPS_ESTABLISHED); 9148 TCP_PROBE5(accept__established, NULL, tp, 9149 mtod(m, const char *), tp, th); 9150 /* 9151 * TFO connections call cc_conn_init() during SYN 9152 * processing. Calling it again here for such connections 9153 * is not harmless as it would undo the snd_cwnd reduction 9154 * that occurs when a TFO SYN|ACK is retransmitted. 9155 */ 9156 if (!IS_FASTOPEN(tp->t_flags)) 9157 cc_conn_init(tp); 9158 } 9159 /* 9160 * Account for the ACK of our SYN prior to 9161 * regular ACK processing below, except for 9162 * simultaneous SYN, which is handled later. 9163 */ 9164 if (SEQ_GT(th->th_ack, tp->snd_una) && !(tp->t_flags & TF_NEEDSYN)) 9165 tp->snd_una++; 9166 /* 9167 * If segment contains data or ACK, will call tcp_reass() later; if 9168 * not, do so now to pass queued data to user. 9169 */ 9170 if (tlen == 0 && (thflags & TH_FIN) == 0) { 9171 (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0, 9172 (struct mbuf *)0); 9173 if (tp->t_flags & TF_WAKESOR) { 9174 tp->t_flags &= ~TF_WAKESOR; 9175 /* NB: sorwakeup_locked() does an implicit unlock. */ 9176 sorwakeup_locked(so); 9177 } 9178 } 9179 tp->snd_wl1 = th->th_seq - 1; 9180 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9181 return (ret_val); 9182 } 9183 if (tp->t_state == TCPS_FIN_WAIT_1) { 9184 /* We could have went to FIN_WAIT_1 (or EST) above */ 9185 /* 9186 * In FIN_WAIT_1 STATE in addition to the processing for the 9187 * ESTABLISHED state if our FIN is now acknowledged then 9188 * enter FIN_WAIT_2. 9189 */ 9190 if (ourfinisacked) { 9191 /* 9192 * If we can't receive any more data, then closing 9193 * user can proceed. Starting the timer is contrary 9194 * to the specification, but if we don't get a FIN 9195 * we'll hang forever. 9196 * 9197 * XXXjl: we should release the tp also, and use a 9198 * compressed state. 9199 */ 9200 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9201 soisdisconnected(so); 9202 tcp_timer_activate(tp, TT_2MSL, 9203 (tcp_fast_finwait2_recycle ? 9204 tcp_finwait2_timeout : 9205 TP_MAXIDLE(tp))); 9206 } 9207 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9208 } 9209 } 9210 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9211 tiwin, thflags, nxt_pkt)); 9212 } 9213 9214 /* 9215 * Return value of 1, the TCB is unlocked and most 9216 * likely gone, return value of 0, the TCB is still 9217 * locked. 9218 */ 9219 static int 9220 bbr_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, 9221 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9222 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9223 { 9224 struct tcp_bbr *bbr; 9225 int32_t ret_val; 9226 9227 /* 9228 * Header prediction: check for the two common cases of a 9229 * uni-directional data xfer. If the packet has no control flags, 9230 * is in-sequence, the window didn't change and we're not 9231 * retransmitting, it's a candidate. If the length is zero and the 9232 * ack moved forward, we're the sender side of the xfer. Just free 9233 * the data acked & wake any higher level process that was blocked 9234 * waiting for space. If the length is non-zero and the ack didn't 9235 * move, we're the receiver side. If we're getting packets in-order 9236 * (the reassembly queue is empty), add the data toc The socket 9237 * buffer and note that we need a delayed ack. Make sure that the 9238 * hidden state-flags are also off. Since we check for 9239 * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN. 9240 */ 9241 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9242 if (bbr->r_ctl.rc_delivered < (4 * tp->t_maxseg)) { 9243 /* 9244 * If we have delived under 4 segments increase the initial 9245 * window if raised by the peer. We use this to determine 9246 * dynamic and static rwnd's at the end of a connection. 9247 */ 9248 bbr->r_ctl.rc_init_rwnd = max(tiwin, tp->snd_wnd); 9249 } 9250 if (__predict_true(((to->to_flags & TOF_SACK) == 0)) && 9251 __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_URG | TH_ACK)) == TH_ACK) && 9252 __predict_true(SEGQ_EMPTY(tp)) && 9253 __predict_true(th->th_seq == tp->rcv_nxt)) { 9254 if (tlen == 0) { 9255 if (bbr_fastack(m, th, so, tp, to, drop_hdrlen, tlen, 9256 tiwin, nxt_pkt, iptos)) { 9257 return (0); 9258 } 9259 } else { 9260 if (bbr_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen, 9261 tiwin, nxt_pkt)) { 9262 return (0); 9263 } 9264 } 9265 } 9266 ctf_calc_rwin(so, tp); 9267 9268 if ((thflags & TH_RST) || 9269 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9270 return (ctf_process_rst(m, th, so, tp)); 9271 /* 9272 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9273 * synchronized state. 9274 */ 9275 if (thflags & TH_SYN) { 9276 ctf_challenge_ack(m, th, tp, &ret_val); 9277 return (ret_val); 9278 } 9279 /* 9280 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9281 * it's less than ts_recent, drop it. 9282 */ 9283 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9284 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9285 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9286 return (ret_val); 9287 } 9288 INP_WLOCK_ASSERT(tp->t_inpcb); 9289 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9290 return (ret_val); 9291 } 9292 /* 9293 * If last ACK falls within this segment's sequence numbers, record 9294 * its timestamp. NOTE: 1) That the test incorporates suggestions 9295 * from the latest proposal of the tcplw@cray.com list (Braden 9296 * 1993/04/26). 2) That updating only on newer timestamps interferes 9297 * with our earlier PAWS tests, so this check should be solely 9298 * predicated on the sequence space of this segment. 3) That we 9299 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9300 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9301 * SEG.Len, This modified check allows us to overcome RFC1323's 9302 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9303 * p.869. In such cases, we can still calculate the RTT correctly 9304 * when RCV.NXT == Last.ACK.Sent. 9305 */ 9306 if ((to->to_flags & TOF_TS) != 0 && 9307 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9308 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9309 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9310 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9311 tp->ts_recent = to->to_tsval; 9312 } 9313 /* 9314 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9315 * is on (half-synchronized state), then queue data for later 9316 * processing; else drop segment and return. 9317 */ 9318 if ((thflags & TH_ACK) == 0) { 9319 if (tp->t_flags & TF_NEEDSYN) { 9320 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9321 tiwin, thflags, nxt_pkt)); 9322 } else if (tp->t_flags & TF_ACKNOW) { 9323 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9324 bbr->r_wanted_output = 1; 9325 return (ret_val); 9326 } else { 9327 ctf_do_drop(m, NULL); 9328 return (0); 9329 } 9330 } 9331 /* 9332 * Ack processing. 9333 */ 9334 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9335 return (ret_val); 9336 } 9337 if (sbavail(&so->so_snd)) { 9338 if (ctf_progress_timeout_check(tp, true)) { 9339 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9340 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9341 return (1); 9342 } 9343 } 9344 /* State changes only happen in bbr_process_data() */ 9345 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9346 tiwin, thflags, nxt_pkt)); 9347 } 9348 9349 /* 9350 * Return value of 1, the TCB is unlocked and most 9351 * likely gone, return value of 0, the TCB is still 9352 * locked. 9353 */ 9354 static int 9355 bbr_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, 9356 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9357 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9358 { 9359 struct tcp_bbr *bbr; 9360 int32_t ret_val; 9361 9362 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9363 ctf_calc_rwin(so, tp); 9364 if ((thflags & TH_RST) || 9365 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9366 return (ctf_process_rst(m, th, so, tp)); 9367 /* 9368 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9369 * synchronized state. 9370 */ 9371 if (thflags & TH_SYN) { 9372 ctf_challenge_ack(m, th, tp, &ret_val); 9373 return (ret_val); 9374 } 9375 /* 9376 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9377 * it's less than ts_recent, drop it. 9378 */ 9379 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9380 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9381 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9382 return (ret_val); 9383 } 9384 INP_WLOCK_ASSERT(tp->t_inpcb); 9385 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9386 return (ret_val); 9387 } 9388 /* 9389 * If last ACK falls within this segment's sequence numbers, record 9390 * its timestamp. NOTE: 1) That the test incorporates suggestions 9391 * from the latest proposal of the tcplw@cray.com list (Braden 9392 * 1993/04/26). 2) That updating only on newer timestamps interferes 9393 * with our earlier PAWS tests, so this check should be solely 9394 * predicated on the sequence space of this segment. 3) That we 9395 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9396 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9397 * SEG.Len, This modified check allows us to overcome RFC1323's 9398 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9399 * p.869. In such cases, we can still calculate the RTT correctly 9400 * when RCV.NXT == Last.ACK.Sent. 9401 */ 9402 if ((to->to_flags & TOF_TS) != 0 && 9403 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9404 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9405 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9406 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9407 tp->ts_recent = to->to_tsval; 9408 } 9409 /* 9410 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9411 * is on (half-synchronized state), then queue data for later 9412 * processing; else drop segment and return. 9413 */ 9414 if ((thflags & TH_ACK) == 0) { 9415 if (tp->t_flags & TF_NEEDSYN) { 9416 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9417 tiwin, thflags, nxt_pkt)); 9418 } else if (tp->t_flags & TF_ACKNOW) { 9419 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9420 bbr->r_wanted_output = 1; 9421 return (ret_val); 9422 } else { 9423 ctf_do_drop(m, NULL); 9424 return (0); 9425 } 9426 } 9427 /* 9428 * Ack processing. 9429 */ 9430 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9431 return (ret_val); 9432 } 9433 if (sbavail(&so->so_snd)) { 9434 if (ctf_progress_timeout_check(tp, true)) { 9435 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9436 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9437 return (1); 9438 } 9439 } 9440 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9441 tiwin, thflags, nxt_pkt)); 9442 } 9443 9444 static int 9445 bbr_check_data_after_close(struct mbuf *m, struct tcp_bbr *bbr, 9446 struct tcpcb *tp, int32_t * tlen, struct tcphdr *th, struct socket *so) 9447 { 9448 9449 if (bbr->rc_allow_data_af_clo == 0) { 9450 close_now: 9451 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE); 9452 /* tcp_close will kill the inp pre-log the Reset */ 9453 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 9454 tp = tcp_close(tp); 9455 KMOD_TCPSTAT_INC(tcps_rcvafterclose); 9456 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); 9457 return (1); 9458 } 9459 if (sbavail(&so->so_snd) == 0) 9460 goto close_now; 9461 /* Ok we allow data that is ignored and a followup reset */ 9462 tp->rcv_nxt = th->th_seq + *tlen; 9463 tp->t_flags2 |= TF2_DROP_AF_DATA; 9464 bbr->r_wanted_output = 1; 9465 *tlen = 0; 9466 return (0); 9467 } 9468 9469 /* 9470 * Return value of 1, the TCB is unlocked and most 9471 * likely gone, return value of 0, the TCB is still 9472 * locked. 9473 */ 9474 static int 9475 bbr_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, 9476 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9477 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9478 { 9479 int32_t ourfinisacked = 0; 9480 int32_t ret_val; 9481 struct tcp_bbr *bbr; 9482 9483 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9484 ctf_calc_rwin(so, tp); 9485 if ((thflags & TH_RST) || 9486 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9487 return (ctf_process_rst(m, th, so, tp)); 9488 /* 9489 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9490 * synchronized state. 9491 */ 9492 if (thflags & TH_SYN) { 9493 ctf_challenge_ack(m, th, tp, &ret_val); 9494 return (ret_val); 9495 } 9496 /* 9497 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9498 * it's less than ts_recent, drop it. 9499 */ 9500 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9501 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9502 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9503 return (ret_val); 9504 } 9505 INP_WLOCK_ASSERT(tp->t_inpcb); 9506 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9507 return (ret_val); 9508 } 9509 /* 9510 * If new data are received on a connection after the user processes 9511 * are gone, then RST the other end. 9512 */ 9513 if ((so->so_state & SS_NOFDREF) && tlen) { 9514 /* 9515 * We call a new function now so we might continue and setup 9516 * to reset at all data being ack'd. 9517 */ 9518 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9519 return (1); 9520 } 9521 /* 9522 * If last ACK falls within this segment's sequence numbers, record 9523 * its timestamp. NOTE: 1) That the test incorporates suggestions 9524 * from the latest proposal of the tcplw@cray.com list (Braden 9525 * 1993/04/26). 2) That updating only on newer timestamps interferes 9526 * with our earlier PAWS tests, so this check should be solely 9527 * predicated on the sequence space of this segment. 3) That we 9528 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9529 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9530 * SEG.Len, This modified check allows us to overcome RFC1323's 9531 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9532 * p.869. In such cases, we can still calculate the RTT correctly 9533 * when RCV.NXT == Last.ACK.Sent. 9534 */ 9535 if ((to->to_flags & TOF_TS) != 0 && 9536 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9537 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9538 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9539 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9540 tp->ts_recent = to->to_tsval; 9541 } 9542 /* 9543 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9544 * is on (half-synchronized state), then queue data for later 9545 * processing; else drop segment and return. 9546 */ 9547 if ((thflags & TH_ACK) == 0) { 9548 if (tp->t_flags & TF_NEEDSYN) { 9549 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9550 tiwin, thflags, nxt_pkt)); 9551 } else if (tp->t_flags & TF_ACKNOW) { 9552 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9553 bbr->r_wanted_output = 1; 9554 return (ret_val); 9555 } else { 9556 ctf_do_drop(m, NULL); 9557 return (0); 9558 } 9559 } 9560 /* 9561 * Ack processing. 9562 */ 9563 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9564 return (ret_val); 9565 } 9566 if (ourfinisacked) { 9567 /* 9568 * If we can't receive any more data, then closing user can 9569 * proceed. Starting the timer is contrary to the 9570 * specification, but if we don't get a FIN we'll hang 9571 * forever. 9572 * 9573 * XXXjl: we should release the tp also, and use a 9574 * compressed state. 9575 */ 9576 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9577 soisdisconnected(so); 9578 tcp_timer_activate(tp, TT_2MSL, 9579 (tcp_fast_finwait2_recycle ? 9580 tcp_finwait2_timeout : 9581 TP_MAXIDLE(tp))); 9582 } 9583 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9584 } 9585 if (sbavail(&so->so_snd)) { 9586 if (ctf_progress_timeout_check(tp, true)) { 9587 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9588 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9589 return (1); 9590 } 9591 } 9592 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9593 tiwin, thflags, nxt_pkt)); 9594 } 9595 9596 /* 9597 * Return value of 1, the TCB is unlocked and most 9598 * likely gone, return value of 0, the TCB is still 9599 * locked. 9600 */ 9601 static int 9602 bbr_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, 9603 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9604 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9605 { 9606 int32_t ourfinisacked = 0; 9607 int32_t ret_val; 9608 struct tcp_bbr *bbr; 9609 9610 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9611 ctf_calc_rwin(so, tp); 9612 if ((thflags & TH_RST) || 9613 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9614 return (ctf_process_rst(m, th, so, tp)); 9615 /* 9616 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9617 * synchronized state. 9618 */ 9619 if (thflags & TH_SYN) { 9620 ctf_challenge_ack(m, th, tp, &ret_val); 9621 return (ret_val); 9622 } 9623 /* 9624 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9625 * it's less than ts_recent, drop it. 9626 */ 9627 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9628 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9629 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9630 return (ret_val); 9631 } 9632 INP_WLOCK_ASSERT(tp->t_inpcb); 9633 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9634 return (ret_val); 9635 } 9636 /* 9637 * If new data are received on a connection after the user processes 9638 * are gone, then RST the other end. 9639 */ 9640 if ((so->so_state & SS_NOFDREF) && tlen) { 9641 /* 9642 * We call a new function now so we might continue and setup 9643 * to reset at all data being ack'd. 9644 */ 9645 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9646 return (1); 9647 } 9648 /* 9649 * If last ACK falls within this segment's sequence numbers, record 9650 * its timestamp. NOTE: 1) That the test incorporates suggestions 9651 * from the latest proposal of the tcplw@cray.com list (Braden 9652 * 1993/04/26). 2) That updating only on newer timestamps interferes 9653 * with our earlier PAWS tests, so this check should be solely 9654 * predicated on the sequence space of this segment. 3) That we 9655 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9656 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9657 * SEG.Len, This modified check allows us to overcome RFC1323's 9658 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9659 * p.869. In such cases, we can still calculate the RTT correctly 9660 * when RCV.NXT == Last.ACK.Sent. 9661 */ 9662 if ((to->to_flags & TOF_TS) != 0 && 9663 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9664 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9665 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9666 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9667 tp->ts_recent = to->to_tsval; 9668 } 9669 /* 9670 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9671 * is on (half-synchronized state), then queue data for later 9672 * processing; else drop segment and return. 9673 */ 9674 if ((thflags & TH_ACK) == 0) { 9675 if (tp->t_flags & TF_NEEDSYN) { 9676 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9677 tiwin, thflags, nxt_pkt)); 9678 } else if (tp->t_flags & TF_ACKNOW) { 9679 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9680 bbr->r_wanted_output = 1; 9681 return (ret_val); 9682 } else { 9683 ctf_do_drop(m, NULL); 9684 return (0); 9685 } 9686 } 9687 /* 9688 * Ack processing. 9689 */ 9690 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9691 return (ret_val); 9692 } 9693 if (ourfinisacked) { 9694 tcp_twstart(tp); 9695 m_freem(m); 9696 return (1); 9697 } 9698 if (sbavail(&so->so_snd)) { 9699 if (ctf_progress_timeout_check(tp, true)) { 9700 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9701 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9702 return (1); 9703 } 9704 } 9705 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9706 tiwin, thflags, nxt_pkt)); 9707 } 9708 9709 /* 9710 * Return value of 1, the TCB is unlocked and most 9711 * likely gone, return value of 0, the TCB is still 9712 * locked. 9713 */ 9714 static int 9715 bbr_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 9716 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9717 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9718 { 9719 int32_t ourfinisacked = 0; 9720 int32_t ret_val; 9721 struct tcp_bbr *bbr; 9722 9723 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9724 ctf_calc_rwin(so, tp); 9725 if ((thflags & TH_RST) || 9726 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9727 return (ctf_process_rst(m, th, so, tp)); 9728 /* 9729 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9730 * synchronized state. 9731 */ 9732 if (thflags & TH_SYN) { 9733 ctf_challenge_ack(m, th, tp, &ret_val); 9734 return (ret_val); 9735 } 9736 /* 9737 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9738 * it's less than ts_recent, drop it. 9739 */ 9740 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9741 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9742 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9743 return (ret_val); 9744 } 9745 INP_WLOCK_ASSERT(tp->t_inpcb); 9746 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9747 return (ret_val); 9748 } 9749 /* 9750 * If new data are received on a connection after the user processes 9751 * are gone, then RST the other end. 9752 */ 9753 if ((so->so_state & SS_NOFDREF) && tlen) { 9754 /* 9755 * We call a new function now so we might continue and setup 9756 * to reset at all data being ack'd. 9757 */ 9758 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9759 return (1); 9760 } 9761 /* 9762 * If last ACK falls within this segment's sequence numbers, record 9763 * its timestamp. NOTE: 1) That the test incorporates suggestions 9764 * from the latest proposal of the tcplw@cray.com list (Braden 9765 * 1993/04/26). 2) That updating only on newer timestamps interferes 9766 * with our earlier PAWS tests, so this check should be solely 9767 * predicated on the sequence space of this segment. 3) That we 9768 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9769 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9770 * SEG.Len, This modified check allows us to overcome RFC1323's 9771 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9772 * p.869. In such cases, we can still calculate the RTT correctly 9773 * when RCV.NXT == Last.ACK.Sent. 9774 */ 9775 if ((to->to_flags & TOF_TS) != 0 && 9776 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9777 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9778 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9779 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9780 tp->ts_recent = to->to_tsval; 9781 } 9782 /* 9783 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9784 * is on (half-synchronized state), then queue data for later 9785 * processing; else drop segment and return. 9786 */ 9787 if ((thflags & TH_ACK) == 0) { 9788 if (tp->t_flags & TF_NEEDSYN) { 9789 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9790 tiwin, thflags, nxt_pkt)); 9791 } else if (tp->t_flags & TF_ACKNOW) { 9792 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9793 bbr->r_wanted_output = 1; 9794 return (ret_val); 9795 } else { 9796 ctf_do_drop(m, NULL); 9797 return (0); 9798 } 9799 } 9800 /* 9801 * case TCPS_LAST_ACK: Ack processing. 9802 */ 9803 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9804 return (ret_val); 9805 } 9806 if (ourfinisacked) { 9807 tp = tcp_close(tp); 9808 ctf_do_drop(m, tp); 9809 return (1); 9810 } 9811 if (sbavail(&so->so_snd)) { 9812 if (ctf_progress_timeout_check(tp, true)) { 9813 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9814 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9815 return (1); 9816 } 9817 } 9818 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9819 tiwin, thflags, nxt_pkt)); 9820 } 9821 9822 /* 9823 * Return value of 1, the TCB is unlocked and most 9824 * likely gone, return value of 0, the TCB is still 9825 * locked. 9826 */ 9827 static int 9828 bbr_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, 9829 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9830 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9831 { 9832 int32_t ourfinisacked = 0; 9833 int32_t ret_val; 9834 struct tcp_bbr *bbr; 9835 9836 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9837 ctf_calc_rwin(so, tp); 9838 /* Reset receive buffer auto scaling when not in bulk receive mode. */ 9839 if ((thflags & TH_RST) || 9840 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9841 return (ctf_process_rst(m, th, so, tp)); 9842 9843 /* 9844 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9845 * synchronized state. 9846 */ 9847 if (thflags & TH_SYN) { 9848 ctf_challenge_ack(m, th, tp, &ret_val); 9849 return (ret_val); 9850 } 9851 INP_WLOCK_ASSERT(tp->t_inpcb); 9852 /* 9853 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9854 * it's less than ts_recent, drop it. 9855 */ 9856 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9857 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9858 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9859 return (ret_val); 9860 } 9861 INP_WLOCK_ASSERT(tp->t_inpcb); 9862 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9863 return (ret_val); 9864 } 9865 /* 9866 * If new data are received on a connection after the user processes 9867 * are gone, then we may RST the other end depending on the outcome 9868 * of bbr_check_data_after_close. 9869 */ 9870 if ((so->so_state & SS_NOFDREF) && 9871 tlen) { 9872 /* 9873 * We call a new function now so we might continue and setup 9874 * to reset at all data being ack'd. 9875 */ 9876 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9877 return (1); 9878 } 9879 INP_WLOCK_ASSERT(tp->t_inpcb); 9880 /* 9881 * If last ACK falls within this segment's sequence numbers, record 9882 * its timestamp. NOTE: 1) That the test incorporates suggestions 9883 * from the latest proposal of the tcplw@cray.com list (Braden 9884 * 1993/04/26). 2) That updating only on newer timestamps interferes 9885 * with our earlier PAWS tests, so this check should be solely 9886 * predicated on the sequence space of this segment. 3) That we 9887 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9888 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9889 * SEG.Len, This modified check allows us to overcome RFC1323's 9890 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9891 * p.869. In such cases, we can still calculate the RTT correctly 9892 * when RCV.NXT == Last.ACK.Sent. 9893 */ 9894 INP_WLOCK_ASSERT(tp->t_inpcb); 9895 if ((to->to_flags & TOF_TS) != 0 && 9896 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9897 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9898 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9899 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9900 tp->ts_recent = to->to_tsval; 9901 } 9902 /* 9903 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9904 * is on (half-synchronized state), then queue data for later 9905 * processing; else drop segment and return. 9906 */ 9907 if ((thflags & TH_ACK) == 0) { 9908 if (tp->t_flags & TF_NEEDSYN) { 9909 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9910 tiwin, thflags, nxt_pkt)); 9911 } else if (tp->t_flags & TF_ACKNOW) { 9912 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9913 bbr->r_wanted_output = 1; 9914 return (ret_val); 9915 } else { 9916 ctf_do_drop(m, NULL); 9917 return (0); 9918 } 9919 } 9920 /* 9921 * Ack processing. 9922 */ 9923 INP_WLOCK_ASSERT(tp->t_inpcb); 9924 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9925 return (ret_val); 9926 } 9927 if (sbavail(&so->so_snd)) { 9928 if (ctf_progress_timeout_check(tp, true)) { 9929 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9930 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9931 return (1); 9932 } 9933 } 9934 INP_WLOCK_ASSERT(tp->t_inpcb); 9935 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9936 tiwin, thflags, nxt_pkt)); 9937 } 9938 9939 static void 9940 bbr_stop_all_timers(struct tcpcb *tp) 9941 { 9942 struct tcp_bbr *bbr; 9943 9944 /* 9945 * Assure no timers are running. 9946 */ 9947 if (tcp_timer_active(tp, TT_PERSIST)) { 9948 /* We enter in persists, set the flag appropriately */ 9949 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9950 bbr->rc_in_persist = 1; 9951 } 9952 tcp_timer_suspend(tp, TT_PERSIST); 9953 tcp_timer_suspend(tp, TT_REXMT); 9954 tcp_timer_suspend(tp, TT_KEEP); 9955 tcp_timer_suspend(tp, TT_DELACK); 9956 } 9957 9958 static void 9959 bbr_google_mode_on(struct tcp_bbr *bbr) 9960 { 9961 bbr->rc_use_google = 1; 9962 bbr->rc_no_pacing = 0; 9963 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 9964 bbr->r_use_policer = bbr_policer_detection_enabled; 9965 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 9966 bbr->bbr_use_rack_cheat = 0; 9967 bbr->r_ctl.rc_incr_tmrs = 0; 9968 bbr->r_ctl.rc_inc_tcp_oh = 0; 9969 bbr->r_ctl.rc_inc_ip_oh = 0; 9970 bbr->r_ctl.rc_inc_enet_oh = 0; 9971 reset_time(&bbr->r_ctl.rc_delrate, 9972 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 9973 reset_time_small(&bbr->r_ctl.rc_rttprop, 9974 (11 * USECS_IN_SECOND)); 9975 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 9976 } 9977 9978 static void 9979 bbr_google_mode_off(struct tcp_bbr *bbr) 9980 { 9981 bbr->rc_use_google = 0; 9982 bbr->r_ctl.bbr_google_discount = 0; 9983 bbr->no_pacing_until = bbr_no_pacing_until; 9984 bbr->r_use_policer = 0; 9985 if (bbr->no_pacing_until) 9986 bbr->rc_no_pacing = 1; 9987 else 9988 bbr->rc_no_pacing = 0; 9989 if (bbr_use_rack_resend_cheat) 9990 bbr->bbr_use_rack_cheat = 1; 9991 else 9992 bbr->bbr_use_rack_cheat = 0; 9993 if (bbr_incr_timers) 9994 bbr->r_ctl.rc_incr_tmrs = 1; 9995 else 9996 bbr->r_ctl.rc_incr_tmrs = 0; 9997 if (bbr_include_tcp_oh) 9998 bbr->r_ctl.rc_inc_tcp_oh = 1; 9999 else 10000 bbr->r_ctl.rc_inc_tcp_oh = 0; 10001 if (bbr_include_ip_oh) 10002 bbr->r_ctl.rc_inc_ip_oh = 1; 10003 else 10004 bbr->r_ctl.rc_inc_ip_oh = 0; 10005 if (bbr_include_enet_oh) 10006 bbr->r_ctl.rc_inc_enet_oh = 1; 10007 else 10008 bbr->r_ctl.rc_inc_enet_oh = 0; 10009 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10010 reset_time(&bbr->r_ctl.rc_delrate, 10011 bbr_num_pktepo_for_del_limit); 10012 reset_time_small(&bbr->r_ctl.rc_rttprop, 10013 (bbr_filter_len_sec * USECS_IN_SECOND)); 10014 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 10015 } 10016 /* 10017 * Return 0 on success, non-zero on failure 10018 * which indicates the error (usually no memory). 10019 */ 10020 static int 10021 bbr_init(struct tcpcb *tp) 10022 { 10023 struct tcp_bbr *bbr = NULL; 10024 struct inpcb *inp; 10025 uint32_t cts; 10026 10027 tp->t_fb_ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO)); 10028 if (tp->t_fb_ptr == NULL) { 10029 /* 10030 * We need to allocate memory but cant. The INP and INP_INFO 10031 * locks and they are recusive (happens during setup. So a 10032 * scheme to drop the locks fails :( 10033 * 10034 */ 10035 return (ENOMEM); 10036 } 10037 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10038 bbr->rtt_valid = 0; 10039 inp = tp->t_inpcb; 10040 inp->inp_flags2 |= INP_CANNOT_DO_ECN; 10041 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ; 10042 TAILQ_INIT(&bbr->r_ctl.rc_map); 10043 TAILQ_INIT(&bbr->r_ctl.rc_free); 10044 TAILQ_INIT(&bbr->r_ctl.rc_tmap); 10045 bbr->rc_tp = tp; 10046 if (tp->t_inpcb) { 10047 bbr->rc_inp = tp->t_inpcb; 10048 } 10049 cts = tcp_get_usecs(&bbr->rc_tv); 10050 tp->t_acktime = 0; 10051 bbr->rc_allow_data_af_clo = bbr_ignore_data_after_close; 10052 bbr->r_ctl.rc_reorder_fade = bbr_reorder_fade; 10053 bbr->rc_tlp_threshold = bbr_tlp_thresh; 10054 bbr->r_ctl.rc_reorder_shift = bbr_reorder_thresh; 10055 bbr->r_ctl.rc_pkt_delay = bbr_pkt_delay; 10056 bbr->r_ctl.rc_min_to = bbr_min_to; 10057 bbr->rc_bbr_state = BBR_STATE_STARTUP; 10058 bbr->r_ctl.bbr_lost_at_state = 0; 10059 bbr->r_ctl.rc_lost_at_startup = 0; 10060 bbr->rc_all_timers_stopped = 0; 10061 bbr->r_ctl.rc_bbr_lastbtlbw = 0; 10062 bbr->r_ctl.rc_pkt_epoch_del = 0; 10063 bbr->r_ctl.rc_pkt_epoch = 0; 10064 bbr->r_ctl.rc_lowest_rtt = 0xffffffff; 10065 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_high_gain; 10066 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 10067 bbr->r_ctl.rc_went_idle_time = cts; 10068 bbr->rc_pacer_started = cts; 10069 bbr->r_ctl.rc_pkt_epoch_time = cts; 10070 bbr->r_ctl.rc_rcvtime = cts; 10071 bbr->r_ctl.rc_bbr_state_time = cts; 10072 bbr->r_ctl.rc_del_time = cts; 10073 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 10074 bbr->r_ctl.last_in_probertt = cts; 10075 bbr->skip_gain = 0; 10076 bbr->gain_is_limited = 0; 10077 bbr->no_pacing_until = bbr_no_pacing_until; 10078 if (bbr->no_pacing_until) 10079 bbr->rc_no_pacing = 1; 10080 if (bbr_use_google_algo) { 10081 bbr->rc_no_pacing = 0; 10082 bbr->rc_use_google = 1; 10083 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 10084 bbr->r_use_policer = bbr_policer_detection_enabled; 10085 } else { 10086 bbr->rc_use_google = 0; 10087 bbr->r_ctl.bbr_google_discount = 0; 10088 bbr->r_use_policer = 0; 10089 } 10090 if (bbr_ts_limiting) 10091 bbr->rc_use_ts_limit = 1; 10092 else 10093 bbr->rc_use_ts_limit = 0; 10094 if (bbr_ts_can_raise) 10095 bbr->ts_can_raise = 1; 10096 else 10097 bbr->ts_can_raise = 0; 10098 if (V_tcp_delack_enabled == 1) 10099 tp->t_delayed_ack = 2; 10100 else if (V_tcp_delack_enabled == 0) 10101 tp->t_delayed_ack = 0; 10102 else if (V_tcp_delack_enabled < 100) 10103 tp->t_delayed_ack = V_tcp_delack_enabled; 10104 else 10105 tp->t_delayed_ack = 2; 10106 if (bbr->rc_use_google == 0) 10107 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10108 else 10109 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 10110 bbr->r_ctl.rc_min_rto_ms = bbr_rto_min_ms; 10111 bbr->rc_max_rto_sec = bbr_rto_max_sec; 10112 bbr->rc_init_win = bbr_def_init_win; 10113 if (tp->t_flags & TF_REQ_TSTMP) 10114 bbr->rc_last_options = TCP_TS_OVERHEAD; 10115 bbr->r_ctl.rc_pace_max_segs = tp->t_maxseg - bbr->rc_last_options; 10116 bbr->r_ctl.rc_high_rwnd = tp->snd_wnd; 10117 bbr->r_init_rtt = 1; 10118 10119 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 10120 if (bbr_allow_hdwr_pacing) 10121 bbr->bbr_hdw_pace_ena = 1; 10122 else 10123 bbr->bbr_hdw_pace_ena = 0; 10124 if (bbr_sends_full_iwnd) 10125 bbr->bbr_init_win_cheat = 1; 10126 else 10127 bbr->bbr_init_win_cheat = 0; 10128 bbr->r_ctl.bbr_utter_max = bbr_hptsi_utter_max; 10129 bbr->r_ctl.rc_drain_pg = bbr_drain_gain; 10130 bbr->r_ctl.rc_startup_pg = bbr_high_gain; 10131 bbr->rc_loss_exit = bbr_exit_startup_at_loss; 10132 bbr->r_ctl.bbr_rttprobe_gain_val = bbr_rttprobe_gain; 10133 bbr->r_ctl.bbr_hptsi_per_second = bbr_hptsi_per_second; 10134 bbr->r_ctl.bbr_hptsi_segments_delay_tar = bbr_hptsi_segments_delay_tar; 10135 bbr->r_ctl.bbr_hptsi_segments_max = bbr_hptsi_segments_max; 10136 bbr->r_ctl.bbr_hptsi_segments_floor = bbr_hptsi_segments_floor; 10137 bbr->r_ctl.bbr_hptsi_bytes_min = bbr_hptsi_bytes_min; 10138 bbr->r_ctl.bbr_cross_over = bbr_cross_over; 10139 bbr->r_ctl.rc_rtt_shrinks = cts; 10140 if (bbr->rc_use_google) { 10141 setup_time_filter(&bbr->r_ctl.rc_delrate, 10142 FILTER_TYPE_MAX, 10143 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 10144 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10145 FILTER_TYPE_MIN, (11 * USECS_IN_SECOND)); 10146 } else { 10147 setup_time_filter(&bbr->r_ctl.rc_delrate, 10148 FILTER_TYPE_MAX, 10149 bbr_num_pktepo_for_del_limit); 10150 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10151 FILTER_TYPE_MIN, (bbr_filter_len_sec * USECS_IN_SECOND)); 10152 } 10153 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_INIT, 0); 10154 if (bbr_uses_idle_restart) 10155 bbr->rc_use_idle_restart = 1; 10156 else 10157 bbr->rc_use_idle_restart = 0; 10158 bbr->r_ctl.rc_bbr_cur_del_rate = 0; 10159 bbr->r_ctl.rc_initial_hptsi_bw = bbr_initial_bw_bps; 10160 if (bbr_resends_use_tso) 10161 bbr->rc_resends_use_tso = 1; 10162 #ifdef NETFLIX_PEAKRATE 10163 tp->t_peakrate_thr = tp->t_maxpeakrate; 10164 #endif 10165 if (tp->snd_una != tp->snd_max) { 10166 /* Create a send map for the current outstanding data */ 10167 struct bbr_sendmap *rsm; 10168 10169 rsm = bbr_alloc(bbr); 10170 if (rsm == NULL) { 10171 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10172 tp->t_fb_ptr = NULL; 10173 return (ENOMEM); 10174 } 10175 rsm->r_rtt_not_allowed = 1; 10176 rsm->r_tim_lastsent[0] = cts; 10177 rsm->r_rtr_cnt = 1; 10178 rsm->r_rtr_bytes = 0; 10179 rsm->r_start = tp->snd_una; 10180 rsm->r_end = tp->snd_max; 10181 rsm->r_dupack = 0; 10182 rsm->r_delivered = bbr->r_ctl.rc_delivered; 10183 rsm->r_ts_valid = 0; 10184 rsm->r_del_ack_ts = tp->ts_recent; 10185 rsm->r_del_time = cts; 10186 if (bbr->r_ctl.r_app_limited_until) 10187 rsm->r_app_limited = 1; 10188 else 10189 rsm->r_app_limited = 0; 10190 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 10191 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 10192 rsm->r_in_tmap = 1; 10193 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 10194 rsm->r_bbr_state = bbr_state_val(bbr); 10195 else 10196 rsm->r_bbr_state = 8; 10197 } 10198 if (bbr_use_rack_resend_cheat && (bbr->rc_use_google == 0)) 10199 bbr->bbr_use_rack_cheat = 1; 10200 if (bbr_incr_timers && (bbr->rc_use_google == 0)) 10201 bbr->r_ctl.rc_incr_tmrs = 1; 10202 if (bbr_include_tcp_oh && (bbr->rc_use_google == 0)) 10203 bbr->r_ctl.rc_inc_tcp_oh = 1; 10204 if (bbr_include_ip_oh && (bbr->rc_use_google == 0)) 10205 bbr->r_ctl.rc_inc_ip_oh = 1; 10206 if (bbr_include_enet_oh && (bbr->rc_use_google == 0)) 10207 bbr->r_ctl.rc_inc_enet_oh = 1; 10208 10209 bbr_log_type_statechange(bbr, cts, __LINE__); 10210 if (TCPS_HAVEESTABLISHED(tp->t_state) && 10211 (tp->t_srtt)) { 10212 uint32_t rtt; 10213 10214 rtt = (TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); 10215 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 10216 } 10217 /* announce the settings and state */ 10218 bbr_log_settings_change(bbr, BBR_RECOVERY_LOWRTT); 10219 tcp_bbr_tso_size_check(bbr, cts); 10220 /* 10221 * Now call the generic function to start a timer. This will place 10222 * the TCB on the hptsi wheel if a timer is needed with appropriate 10223 * flags. 10224 */ 10225 bbr_stop_all_timers(tp); 10226 bbr_start_hpts_timer(bbr, tp, cts, 5, 0, 0); 10227 return (0); 10228 } 10229 10230 /* 10231 * Return 0 if we can accept the connection. Return 10232 * non-zero if we can't handle the connection. A EAGAIN 10233 * means you need to wait until the connection is up. 10234 * a EADDRNOTAVAIL means we can never handle the connection 10235 * (no SACK). 10236 */ 10237 static int 10238 bbr_handoff_ok(struct tcpcb *tp) 10239 { 10240 if ((tp->t_state == TCPS_CLOSED) || 10241 (tp->t_state == TCPS_LISTEN)) { 10242 /* Sure no problem though it may not stick */ 10243 return (0); 10244 } 10245 if ((tp->t_state == TCPS_SYN_SENT) || 10246 (tp->t_state == TCPS_SYN_RECEIVED)) { 10247 /* 10248 * We really don't know you have to get to ESTAB or beyond 10249 * to tell. 10250 */ 10251 return (EAGAIN); 10252 } 10253 if (tp->t_flags & TF_SENTFIN) 10254 return (EINVAL); 10255 if ((tp->t_flags & TF_SACK_PERMIT) || bbr_sack_not_required) { 10256 return (0); 10257 } 10258 /* 10259 * If we reach here we don't do SACK on this connection so we can 10260 * never do rack. 10261 */ 10262 return (EINVAL); 10263 } 10264 10265 static void 10266 bbr_fini(struct tcpcb *tp, int32_t tcb_is_purged) 10267 { 10268 if (tp->t_fb_ptr) { 10269 uint32_t calc; 10270 struct tcp_bbr *bbr; 10271 struct bbr_sendmap *rsm; 10272 10273 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10274 if (bbr->r_ctl.crte) 10275 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 10276 bbr_log_flowend(bbr); 10277 bbr->rc_tp = NULL; 10278 if (tp->t_inpcb) { 10279 /* Backout any flags2 we applied */ 10280 tp->t_inpcb->inp_flags2 &= ~INP_CANNOT_DO_ECN; 10281 tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ; 10282 tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 10283 } 10284 if (bbr->bbr_hdrw_pacing) 10285 counter_u64_add(bbr_flows_whdwr_pacing, -1); 10286 else 10287 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 10288 if (bbr->r_ctl.crte != NULL) { 10289 tcp_rel_pacing_rate(bbr->r_ctl.crte, tp); 10290 bbr->r_ctl.crte = NULL; 10291 } 10292 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10293 while (rsm) { 10294 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 10295 uma_zfree(bbr_zone, rsm); 10296 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10297 } 10298 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10299 while (rsm) { 10300 TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); 10301 uma_zfree(bbr_zone, rsm); 10302 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10303 } 10304 calc = bbr->r_ctl.rc_high_rwnd - bbr->r_ctl.rc_init_rwnd; 10305 if (calc > (bbr->r_ctl.rc_init_rwnd / 10)) 10306 BBR_STAT_INC(bbr_dynamic_rwnd); 10307 else 10308 BBR_STAT_INC(bbr_static_rwnd); 10309 bbr->r_ctl.rc_free_cnt = 0; 10310 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10311 tp->t_fb_ptr = NULL; 10312 } 10313 /* Make sure snd_nxt is correctly set */ 10314 tp->snd_nxt = tp->snd_max; 10315 } 10316 10317 static void 10318 bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win) 10319 { 10320 switch (tp->t_state) { 10321 case TCPS_SYN_SENT: 10322 bbr->r_state = TCPS_SYN_SENT; 10323 bbr->r_substate = bbr_do_syn_sent; 10324 break; 10325 case TCPS_SYN_RECEIVED: 10326 bbr->r_state = TCPS_SYN_RECEIVED; 10327 bbr->r_substate = bbr_do_syn_recv; 10328 break; 10329 case TCPS_ESTABLISHED: 10330 bbr->r_ctl.rc_init_rwnd = max(win, bbr->rc_tp->snd_wnd); 10331 bbr->r_state = TCPS_ESTABLISHED; 10332 bbr->r_substate = bbr_do_established; 10333 break; 10334 case TCPS_CLOSE_WAIT: 10335 bbr->r_state = TCPS_CLOSE_WAIT; 10336 bbr->r_substate = bbr_do_close_wait; 10337 break; 10338 case TCPS_FIN_WAIT_1: 10339 bbr->r_state = TCPS_FIN_WAIT_1; 10340 bbr->r_substate = bbr_do_fin_wait_1; 10341 break; 10342 case TCPS_CLOSING: 10343 bbr->r_state = TCPS_CLOSING; 10344 bbr->r_substate = bbr_do_closing; 10345 break; 10346 case TCPS_LAST_ACK: 10347 bbr->r_state = TCPS_LAST_ACK; 10348 bbr->r_substate = bbr_do_lastack; 10349 break; 10350 case TCPS_FIN_WAIT_2: 10351 bbr->r_state = TCPS_FIN_WAIT_2; 10352 bbr->r_substate = bbr_do_fin_wait_2; 10353 break; 10354 case TCPS_LISTEN: 10355 case TCPS_CLOSED: 10356 case TCPS_TIME_WAIT: 10357 default: 10358 break; 10359 }; 10360 } 10361 10362 static void 10363 bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int32_t line, int dolog) 10364 { 10365 /* 10366 * Now what state are we going into now? Is there adjustments 10367 * needed? 10368 */ 10369 int32_t old_state, old_gain; 10370 10371 old_state = bbr_state_val(bbr); 10372 old_gain = bbr->r_ctl.rc_bbr_hptsi_gain; 10373 if (bbr_state_val(bbr) == BBR_SUB_LEVEL1) { 10374 /* Save the lowest srtt we saw in our end of the sub-state */ 10375 bbr->rc_hit_state_1 = 0; 10376 if (bbr->r_ctl.bbr_smallest_srtt_this_state != 0xffffffff) 10377 bbr->r_ctl.bbr_smallest_srtt_state2 = bbr->r_ctl.bbr_smallest_srtt_this_state; 10378 } 10379 bbr->rc_bbr_substate++; 10380 if (bbr->rc_bbr_substate >= BBR_SUBSTATE_COUNT) { 10381 /* Cycle back to first state-> gain */ 10382 bbr->rc_bbr_substate = 0; 10383 } 10384 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10385 /* 10386 * We enter the gain(5/4) cycle (possibly less if 10387 * shallow buffer detection is enabled) 10388 */ 10389 if (bbr->skip_gain) { 10390 /* 10391 * Hardware pacing has set our rate to 10392 * the max and limited our b/w just 10393 * do level i.e. no gain. 10394 */ 10395 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_LEVEL1]; 10396 } else if (bbr->gain_is_limited && 10397 bbr->bbr_hdrw_pacing && 10398 bbr->r_ctl.crte) { 10399 /* 10400 * We can't gain above the hardware pacing 10401 * rate which is less than our rate + the gain 10402 * calculate the gain needed to reach the hardware 10403 * pacing rate.. 10404 */ 10405 uint64_t bw, rate, gain_calc; 10406 10407 bw = bbr_get_bw(bbr); 10408 rate = bbr->r_ctl.crte->rate; 10409 if ((rate > bw) && 10410 (((bw * (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]) / (uint64_t)BBR_UNIT) > rate)) { 10411 gain_calc = (rate * BBR_UNIT) / bw; 10412 if (gain_calc < BBR_UNIT) 10413 gain_calc = BBR_UNIT; 10414 bbr->r_ctl.rc_bbr_hptsi_gain = (uint16_t)gain_calc; 10415 } else { 10416 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10417 } 10418 } else 10419 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10420 if ((bbr->rc_use_google == 0) && (bbr_gain_to_target == 0)) { 10421 bbr->r_ctl.rc_bbr_state_atflight = cts; 10422 } else 10423 bbr->r_ctl.rc_bbr_state_atflight = 0; 10424 } else if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10425 bbr->rc_hit_state_1 = 1; 10426 bbr->r_ctl.rc_exta_time_gd = 0; 10427 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10428 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10429 if (bbr_state_drain_2_tar) { 10430 bbr->r_ctl.rc_bbr_state_atflight = 0; 10431 } else 10432 bbr->r_ctl.rc_bbr_state_atflight = cts; 10433 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_DRAIN]; 10434 } else { 10435 /* All other cycles hit here 2-7 */ 10436 if ((old_state == BBR_SUB_DRAIN) && bbr->rc_hit_state_1) { 10437 if (bbr_sub_drain_slam_cwnd && 10438 (bbr->rc_use_google == 0) && 10439 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10440 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10441 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10442 } 10443 if ((cts - bbr->r_ctl.rc_bbr_state_time) > bbr_get_rtt(bbr, BBR_RTT_PROP)) 10444 bbr->r_ctl.rc_exta_time_gd += ((cts - bbr->r_ctl.rc_bbr_state_time) - 10445 bbr_get_rtt(bbr, BBR_RTT_PROP)); 10446 else 10447 bbr->r_ctl.rc_exta_time_gd = 0; 10448 if (bbr->r_ctl.rc_exta_time_gd) { 10449 bbr->r_ctl.rc_level_state_extra = bbr->r_ctl.rc_exta_time_gd; 10450 /* Now chop up the time for each state (div by 7) */ 10451 bbr->r_ctl.rc_level_state_extra /= 7; 10452 if (bbr_rand_ot && bbr->r_ctl.rc_level_state_extra) { 10453 /* Add a randomization */ 10454 bbr_randomize_extra_state_time(bbr); 10455 } 10456 } 10457 } 10458 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10459 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[bbr_state_val(bbr)]; 10460 } 10461 if (bbr->rc_use_google) { 10462 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10463 } 10464 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10465 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 10466 if (dolog) 10467 bbr_log_type_statechange(bbr, cts, line); 10468 10469 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10470 uint32_t time_in; 10471 10472 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10473 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 10474 counter_u64_add(bbr_state_time[(old_state + 5)], time_in); 10475 } else { 10476 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10477 } 10478 } 10479 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 10480 bbr_set_state_target(bbr, __LINE__); 10481 if (bbr_sub_drain_slam_cwnd && 10482 (bbr->rc_use_google == 0) && 10483 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10484 /* Slam down the cwnd */ 10485 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10486 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10487 if (bbr_sub_drain_app_limit) { 10488 /* Go app limited if we are on a long drain */ 10489 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + 10490 ctf_flight_size(bbr->rc_tp, 10491 (bbr->r_ctl.rc_sacked + 10492 bbr->r_ctl.rc_lost_bytes))); 10493 } 10494 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10495 } 10496 if (bbr->rc_lt_use_bw) { 10497 /* In policed mode we clamp pacing_gain to BBR_UNIT */ 10498 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10499 } 10500 /* Google changes TSO size every cycle */ 10501 if (bbr->rc_use_google) 10502 tcp_bbr_tso_size_check(bbr, cts); 10503 bbr->r_ctl.gain_epoch = cts; 10504 bbr->r_ctl.rc_bbr_state_time = cts; 10505 bbr->r_ctl.substate_pe = bbr->r_ctl.rc_pkt_epoch; 10506 } 10507 10508 static void 10509 bbr_set_probebw_google_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10510 { 10511 if ((bbr_state_val(bbr) == BBR_SUB_DRAIN) && 10512 (google_allow_early_out == 1) && 10513 (bbr->r_ctl.rc_flight_at_input <= bbr->r_ctl.rc_target_at_state)) { 10514 /* We have reached out target flight size possibly early */ 10515 goto change_state; 10516 } 10517 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10518 return; 10519 } 10520 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_get_rtt(bbr, BBR_RTT_PROP)) { 10521 /* 10522 * Must be a rttProp movement forward before 10523 * we can change states. 10524 */ 10525 return; 10526 } 10527 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10528 /* 10529 * The needed time has passed but for 10530 * the gain cycle extra rules apply: 10531 * 1) If we have seen loss, we exit 10532 * 2) If we have not reached the target 10533 * we stay in GAIN (gain-to-target). 10534 */ 10535 if (google_consider_lost && losses) 10536 goto change_state; 10537 if (bbr->r_ctl.rc_target_at_state > bbr->r_ctl.rc_flight_at_input) { 10538 return; 10539 } 10540 } 10541 change_state: 10542 /* For gain we must reach our target, all others last 1 rttProp */ 10543 bbr_substate_change(bbr, cts, __LINE__, 1); 10544 } 10545 10546 static void 10547 bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10548 { 10549 uint32_t flight, bbr_cur_cycle_time; 10550 10551 if (bbr->rc_use_google) { 10552 bbr_set_probebw_google_gains(bbr, cts, losses); 10553 return; 10554 } 10555 if (cts == 0) { 10556 /* 10557 * Never alow cts to be 0 we 10558 * do this so we can judge if 10559 * we have set a timestamp. 10560 */ 10561 cts = 1; 10562 } 10563 if (bbr_state_is_pkt_epoch) 10564 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); 10565 else 10566 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PROP); 10567 10568 if (bbr->r_ctl.rc_bbr_state_atflight == 0) { 10569 if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10570 flight = ctf_flight_size(bbr->rc_tp, 10571 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10572 if (bbr_sub_drain_slam_cwnd && bbr->rc_hit_state_1) { 10573 /* Keep it slam down */ 10574 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state) { 10575 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10576 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10577 } 10578 if (bbr_sub_drain_app_limit) { 10579 /* Go app limited if we are on a long drain */ 10580 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + flight); 10581 } 10582 } 10583 if (TSTMP_GT(cts, bbr->r_ctl.gain_epoch) && 10584 (((cts - bbr->r_ctl.gain_epoch) > bbr_get_rtt(bbr, BBR_RTT_PROP)) || 10585 (flight >= bbr->r_ctl.flightsize_at_drain))) { 10586 /* 10587 * Still here after the same time as 10588 * the gain. We need to drain harder 10589 * for the next srtt. Reduce by a set amount 10590 * the gain drop is capped at DRAIN states 10591 * value (88). 10592 */ 10593 bbr->r_ctl.flightsize_at_drain = flight; 10594 if (bbr_drain_drop_mul && 10595 bbr_drain_drop_div && 10596 (bbr_drain_drop_mul < bbr_drain_drop_div)) { 10597 /* Use your specific drop value (def 4/5 = 20%) */ 10598 bbr->r_ctl.rc_bbr_hptsi_gain *= bbr_drain_drop_mul; 10599 bbr->r_ctl.rc_bbr_hptsi_gain /= bbr_drain_drop_div; 10600 } else { 10601 /* You get drop of 20% */ 10602 bbr->r_ctl.rc_bbr_hptsi_gain *= 4; 10603 bbr->r_ctl.rc_bbr_hptsi_gain /= 5; 10604 } 10605 if (bbr->r_ctl.rc_bbr_hptsi_gain <= bbr_drain_floor) { 10606 /* Reduce our gain again to the bottom */ 10607 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 10608 } 10609 bbr_log_exit_gain(bbr, cts, 4); 10610 /* 10611 * Extend out so we wait another 10612 * epoch before dropping again. 10613 */ 10614 bbr->r_ctl.gain_epoch = cts; 10615 } 10616 if (flight <= bbr->r_ctl.rc_target_at_state) { 10617 if (bbr_sub_drain_slam_cwnd && 10618 (bbr->rc_use_google == 0) && 10619 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10620 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10621 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10622 } 10623 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10624 bbr_log_exit_gain(bbr, cts, 3); 10625 } 10626 } else { 10627 /* Its a gain */ 10628 if (bbr->r_ctl.rc_lost > bbr->r_ctl.bbr_lost_at_state) { 10629 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10630 goto change_state; 10631 } 10632 if ((ctf_outstanding(bbr->rc_tp) >= bbr->r_ctl.rc_target_at_state) || 10633 ((ctf_outstanding(bbr->rc_tp) + bbr->rc_tp->t_maxseg - 1) >= 10634 bbr->rc_tp->snd_wnd)) { 10635 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10636 bbr_log_exit_gain(bbr, cts, 2); 10637 } 10638 } 10639 /** 10640 * We fall through and return always one of two things has 10641 * occurred. 10642 * 1) We are still not at target 10643 * <or> 10644 * 2) We reached the target and set rc_bbr_state_atflight 10645 * which means we no longer hit this block 10646 * next time we are called. 10647 */ 10648 return; 10649 } 10650 change_state: 10651 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) 10652 return; 10653 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_cur_cycle_time) { 10654 /* Less than a full time-period has passed */ 10655 return; 10656 } 10657 if (bbr->r_ctl.rc_level_state_extra && 10658 (bbr_state_val(bbr) > BBR_SUB_DRAIN) && 10659 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10660 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10661 /* Less than a full time-period + extra has passed */ 10662 return; 10663 } 10664 if (bbr_gain_gets_extra_too && 10665 bbr->r_ctl.rc_level_state_extra && 10666 (bbr_state_val(bbr) == BBR_SUB_GAIN) && 10667 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10668 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10669 /* Less than a full time-period + extra has passed */ 10670 return; 10671 } 10672 bbr_substate_change(bbr, cts, __LINE__, 1); 10673 } 10674 10675 static uint32_t 10676 bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain) 10677 { 10678 uint32_t mss, tar; 10679 10680 if (bbr->rc_use_google) { 10681 /* Google just uses the cwnd target */ 10682 tar = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), gain); 10683 } else { 10684 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), 10685 bbr->r_ctl.rc_pace_max_segs); 10686 /* Get the base cwnd with gain rounded to a mss */ 10687 tar = roundup(bbr_get_raw_target_cwnd(bbr, bbr_get_bw(bbr), 10688 gain), mss); 10689 /* Make sure it is within our min */ 10690 if (tar < get_min_cwnd(bbr)) 10691 return (get_min_cwnd(bbr)); 10692 } 10693 return (tar); 10694 } 10695 10696 static void 10697 bbr_set_state_target(struct tcp_bbr *bbr, int line) 10698 { 10699 uint32_t tar, meth; 10700 10701 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 10702 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 10703 /* Special case using old probe-rtt method */ 10704 tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10705 meth = 1; 10706 } else { 10707 /* Non-probe-rtt case and reduced probe-rtt */ 10708 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 10709 (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) { 10710 /* For gain cycle we use the hptsi gain */ 10711 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10712 meth = 2; 10713 } else if ((bbr_target_is_bbunit) || bbr->rc_use_google) { 10714 /* 10715 * If configured, or for google all other states 10716 * get BBR_UNIT. 10717 */ 10718 tar = bbr_get_a_state_target(bbr, BBR_UNIT); 10719 meth = 3; 10720 } else { 10721 /* 10722 * Or we set a target based on the pacing gain 10723 * for non-google mode and default (non-configured). 10724 * Note we don't set a target goal below drain (192). 10725 */ 10726 if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN]) { 10727 tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]); 10728 meth = 4; 10729 } else { 10730 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10731 meth = 5; 10732 } 10733 } 10734 } 10735 bbr_log_set_of_state_target(bbr, tar, line, meth); 10736 bbr->r_ctl.rc_target_at_state = tar; 10737 } 10738 10739 static void 10740 bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 10741 { 10742 /* Change to probe_rtt */ 10743 uint32_t time_in; 10744 10745 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10746 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10747 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10748 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.flightsize_at_drain 10749 + bbr->r_ctl.rc_delivered); 10750 /* Setup so we force feed the filter */ 10751 if (bbr->rc_use_google || bbr_probertt_sets_rtt) 10752 bbr->rc_prtt_set_ts = 1; 10753 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10754 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10755 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10756 } 10757 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_ENTERPROBE, 0); 10758 bbr->r_ctl.rc_rtt_shrinks = cts; 10759 bbr->r_ctl.last_in_probertt = cts; 10760 bbr->r_ctl.rc_probertt_srttchktim = cts; 10761 bbr->r_ctl.rc_bbr_state_time = cts; 10762 bbr->rc_bbr_state = BBR_STATE_PROBE_RTT; 10763 /* We need to force the filter to update */ 10764 10765 if ((bbr_sub_drain_slam_cwnd) && 10766 bbr->rc_hit_state_1 && 10767 (bbr->rc_use_google == 0) && 10768 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10769 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_saved_cwnd) 10770 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10771 } else 10772 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10773 /* Update the lost */ 10774 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 10775 if ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google){ 10776 /* Set to the non-configurable default of 4 (PROBE_RTT_MIN) */ 10777 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10778 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10779 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10780 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10781 bbr_log_set_of_state_target(bbr, bbr->rc_tp->snd_cwnd, __LINE__, 6); 10782 bbr->r_ctl.rc_target_at_state = bbr->rc_tp->snd_cwnd; 10783 } else { 10784 /* 10785 * We bring it down slowly by using a hptsi gain that is 10786 * probably 75%. This will slowly float down our outstanding 10787 * without tampering with the cwnd. 10788 */ 10789 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 10790 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10791 bbr_set_state_target(bbr, __LINE__); 10792 if (bbr_prtt_slam_cwnd && 10793 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 10794 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10795 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10796 } 10797 } 10798 if (ctf_flight_size(bbr->rc_tp, 10799 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 10800 bbr->r_ctl.rc_target_at_state) { 10801 /* We are at target */ 10802 bbr->r_ctl.rc_bbr_enters_probertt = cts; 10803 } else { 10804 /* We need to come down to reach target before our time begins */ 10805 bbr->r_ctl.rc_bbr_enters_probertt = 0; 10806 } 10807 bbr->r_ctl.rc_pe_of_prtt = bbr->r_ctl.rc_pkt_epoch; 10808 BBR_STAT_INC(bbr_enter_probertt); 10809 bbr_log_exit_gain(bbr, cts, 0); 10810 bbr_log_type_statechange(bbr, cts, line); 10811 } 10812 10813 static void 10814 bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts) 10815 { 10816 /* 10817 * Sanity check on probe-rtt intervals. 10818 * In crazy situations where we are competing 10819 * against new-reno flows with huge buffers 10820 * our rtt-prop interval could come to dominate 10821 * things if we can't get through a full set 10822 * of cycles, we need to adjust it. 10823 */ 10824 if (bbr_can_adjust_probertt && 10825 (bbr->rc_use_google == 0)) { 10826 uint16_t val = 0; 10827 uint32_t cur_rttp, fval, newval, baseval; 10828 10829 /* Are we to small and go into probe-rtt to often? */ 10830 baseval = (bbr_get_rtt(bbr, BBR_RTT_PROP) * (BBR_SUBSTATE_COUNT + 1)); 10831 cur_rttp = roundup(baseval, USECS_IN_SECOND); 10832 fval = bbr_filter_len_sec * USECS_IN_SECOND; 10833 if (bbr_is_ratio == 0) { 10834 if (fval > bbr_rtt_probe_limit) 10835 newval = cur_rttp + (fval - bbr_rtt_probe_limit); 10836 else 10837 newval = cur_rttp; 10838 } else { 10839 int mul; 10840 10841 mul = fval / bbr_rtt_probe_limit; 10842 newval = cur_rttp * mul; 10843 } 10844 if (cur_rttp > bbr->r_ctl.rc_probertt_int) { 10845 bbr->r_ctl.rc_probertt_int = cur_rttp; 10846 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 10847 val = 1; 10848 } else { 10849 /* 10850 * No adjustments were made 10851 * do we need to shrink it? 10852 */ 10853 if (bbr->r_ctl.rc_probertt_int > bbr_rtt_probe_limit) { 10854 if (cur_rttp <= bbr_rtt_probe_limit) { 10855 /* 10856 * Things have calmed down lets 10857 * shrink all the way to default 10858 */ 10859 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10860 reset_time_small(&bbr->r_ctl.rc_rttprop, 10861 (bbr_filter_len_sec * USECS_IN_SECOND)); 10862 cur_rttp = bbr_rtt_probe_limit; 10863 newval = (bbr_filter_len_sec * USECS_IN_SECOND); 10864 val = 2; 10865 } else { 10866 /* 10867 * Well does some adjustment make sense? 10868 */ 10869 if (cur_rttp < bbr->r_ctl.rc_probertt_int) { 10870 /* We can reduce interval time some */ 10871 bbr->r_ctl.rc_probertt_int = cur_rttp; 10872 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 10873 val = 3; 10874 } 10875 } 10876 } 10877 } 10878 if (val) 10879 bbr_log_rtt_shrinks(bbr, cts, cur_rttp, newval, __LINE__, BBR_RTTS_RESETS_VALUES, val); 10880 } 10881 } 10882 10883 static void 10884 bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 10885 { 10886 /* Exit probe-rtt */ 10887 10888 if (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd) { 10889 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10890 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10891 } 10892 bbr_log_exit_gain(bbr, cts, 1); 10893 bbr->rc_hit_state_1 = 0; 10894 bbr->r_ctl.rc_rtt_shrinks = cts; 10895 bbr->r_ctl.last_in_probertt = cts; 10896 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_RTTPROBE, 0); 10897 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10898 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, 10899 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 10900 bbr->r_ctl.rc_delivered); 10901 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10902 uint32_t time_in; 10903 10904 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10905 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10906 } 10907 if (bbr->rc_filled_pipe) { 10908 /* Switch to probe_bw */ 10909 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 10910 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 10911 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 10912 bbr_substate_change(bbr, cts, __LINE__, 0); 10913 bbr_log_type_statechange(bbr, cts, __LINE__); 10914 } else { 10915 /* Back to startup */ 10916 bbr->rc_bbr_state = BBR_STATE_STARTUP; 10917 bbr->r_ctl.rc_bbr_state_time = cts; 10918 /* 10919 * We don't want to give a complete free 3 10920 * measurements until we exit, so we use 10921 * the number of pe's we were in probe-rtt 10922 * to add to the startup_epoch. That way 10923 * we will still retain the old state. 10924 */ 10925 bbr->r_ctl.rc_bbr_last_startup_epoch += (bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_pe_of_prtt); 10926 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 10927 /* Make sure to use the lower pg when shifting back in */ 10928 if (bbr->r_ctl.rc_lost && 10929 bbr_use_lower_gain_in_startup && 10930 (bbr->rc_use_google == 0)) 10931 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 10932 else 10933 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 10934 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 10935 /* Probably not needed but set it anyway */ 10936 bbr_set_state_target(bbr, __LINE__); 10937 bbr_log_type_statechange(bbr, cts, __LINE__); 10938 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10939 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 0); 10940 } 10941 bbr_check_probe_rtt_limits(bbr, cts); 10942 } 10943 10944 static int32_t inline 10945 bbr_should_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts) 10946 { 10947 if ((bbr->rc_past_init_win == 1) && 10948 (bbr->rc_in_persist == 0) && 10949 (bbr_calc_time(cts, bbr->r_ctl.rc_rtt_shrinks) >= bbr->r_ctl.rc_probertt_int)) { 10950 return (1); 10951 } 10952 if (bbr_can_force_probertt && 10953 (bbr->rc_in_persist == 0) && 10954 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 10955 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 10956 return (1); 10957 } 10958 return (0); 10959 } 10960 10961 static int32_t 10962 bbr_google_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t pkt_epoch) 10963 { 10964 uint64_t btlbw, gain; 10965 if (pkt_epoch == 0) { 10966 /* 10967 * Need to be on a pkt-epoch to continue. 10968 */ 10969 return (0); 10970 } 10971 btlbw = bbr_get_full_bw(bbr); 10972 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 10973 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 10974 if (btlbw >= gain) { 10975 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 10976 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10977 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 10978 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 10979 } 10980 if ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) 10981 return (1); 10982 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10983 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 10984 return(0); 10985 } 10986 10987 static int32_t inline 10988 bbr_state_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch) 10989 { 10990 /* Have we gained 25% in the last 3 packet based epoch's? */ 10991 uint64_t btlbw, gain; 10992 int do_exit; 10993 int delta, rtt_gain; 10994 10995 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 10996 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 10997 /* 10998 * This qualifies as a RTT_PROBE session since we drop the 10999 * data outstanding to nothing and waited more than 11000 * bbr_rtt_probe_time. 11001 */ 11002 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11003 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11004 } 11005 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11006 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11007 return (0); 11008 } 11009 if (bbr->rc_use_google) 11010 return (bbr_google_startup(bbr, cts, pkt_epoch)); 11011 11012 if ((bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11013 (bbr_use_lower_gain_in_startup)) { 11014 /* Drop to a lower gain 1.5 x since we saw loss */ 11015 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 11016 } 11017 if (pkt_epoch == 0) { 11018 /* 11019 * Need to be on a pkt-epoch to continue. 11020 */ 11021 return (0); 11022 } 11023 if (bbr_rtt_gain_thresh) { 11024 /* 11025 * Do we allow a flow to stay 11026 * in startup with no loss and no 11027 * gain in rtt over a set threshold? 11028 */ 11029 if (bbr->r_ctl.rc_pkt_epoch_rtt && 11030 bbr->r_ctl.startup_last_srtt && 11031 (bbr->r_ctl.rc_pkt_epoch_rtt > bbr->r_ctl.startup_last_srtt)) { 11032 delta = bbr->r_ctl.rc_pkt_epoch_rtt - bbr->r_ctl.startup_last_srtt; 11033 rtt_gain = (delta * 100) / bbr->r_ctl.startup_last_srtt; 11034 } else 11035 rtt_gain = 0; 11036 if ((bbr->r_ctl.startup_last_srtt == 0) || 11037 (bbr->r_ctl.rc_pkt_epoch_rtt < bbr->r_ctl.startup_last_srtt)) 11038 /* First time or new lower value */ 11039 bbr->r_ctl.startup_last_srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 11040 11041 if ((bbr->r_ctl.rc_lost == 0) && 11042 (rtt_gain < bbr_rtt_gain_thresh)) { 11043 /* 11044 * No loss, and we are under 11045 * our gain threhold for 11046 * increasing RTT. 11047 */ 11048 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11049 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11050 bbr_log_startup_event(bbr, cts, rtt_gain, 11051 delta, bbr->r_ctl.startup_last_srtt, 10); 11052 return (0); 11053 } 11054 } 11055 if ((bbr->r_ctl.r_measurement_count == bbr->r_ctl.last_startup_measure) && 11056 (bbr->r_ctl.rc_lost_at_startup == bbr->r_ctl.rc_lost) && 11057 (!IN_RECOVERY(bbr->rc_tp->t_flags))) { 11058 /* 11059 * We only assess if we have a new measurment when 11060 * we have no loss and are not in recovery. 11061 * Drag up by one our last_startup epoch so we will hold 11062 * the number of non-gain we have already accumulated. 11063 */ 11064 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11065 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11066 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11067 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 9); 11068 return (0); 11069 } 11070 /* Case where we reduced the lost (bad retransmit) */ 11071 if (bbr->r_ctl.rc_lost_at_startup > bbr->r_ctl.rc_lost) 11072 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11073 bbr->r_ctl.last_startup_measure = bbr->r_ctl.r_measurement_count; 11074 btlbw = bbr_get_full_bw(bbr); 11075 if (bbr->r_ctl.rc_bbr_hptsi_gain == bbr_startup_lower) 11076 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11077 (uint64_t)bbr_low_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11078 else 11079 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11080 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11081 do_exit = 0; 11082 if (btlbw > bbr->r_ctl.rc_bbr_lastbtlbw) 11083 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 11084 if (btlbw >= gain) { 11085 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 11086 /* Update the lost so we won't exit in next set of tests */ 11087 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11088 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11089 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 11090 } 11091 if ((bbr->rc_loss_exit && 11092 (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11093 (bbr->r_ctl.rc_pkt_epoch_loss_rate > bbr_startup_loss_thresh)) && 11094 ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)) { 11095 /* 11096 * If we had no gain, we had loss and that loss was above 11097 * our threshould, the rwnd is not constrained, and we have 11098 * had at least 3 packet epochs exit. Note that this is 11099 * switched off by sysctl. Google does not do this by the 11100 * way. 11101 */ 11102 if ((ctf_flight_size(bbr->rc_tp, 11103 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 11104 (2 * max(bbr->r_ctl.rc_pace_max_segs, bbr->rc_tp->t_maxseg))) <= bbr->rc_tp->snd_wnd) { 11105 do_exit = 1; 11106 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11107 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 4); 11108 } else { 11109 /* Just record an updated loss value */ 11110 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11111 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11112 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 5); 11113 } 11114 } else 11115 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11116 if (((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) || 11117 do_exit) { 11118 /* Return 1 to exit the startup state. */ 11119 return (1); 11120 } 11121 /* Stay in startup */ 11122 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11123 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 11124 return (0); 11125 } 11126 11127 static void 11128 bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch, uint32_t losses) 11129 { 11130 /* 11131 * A tick occurred in the rtt epoch do we need to do anything? 11132 */ 11133 #ifdef BBR_INVARIANTS 11134 if ((bbr->rc_bbr_state != BBR_STATE_STARTUP) && 11135 (bbr->rc_bbr_state != BBR_STATE_DRAIN) && 11136 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) && 11137 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 11138 (bbr->rc_bbr_state != BBR_STATE_PROBE_BW)) { 11139 /* Debug code? */ 11140 panic("Unknown BBR state %d?\n", bbr->rc_bbr_state); 11141 } 11142 #endif 11143 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 11144 /* Do we exit the startup state? */ 11145 if (bbr_state_startup(bbr, cts, epoch, pkt_epoch)) { 11146 uint32_t time_in; 11147 11148 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11149 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 6); 11150 bbr->rc_filled_pipe = 1; 11151 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11152 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11153 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11154 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11155 } else 11156 time_in = 0; 11157 if (bbr->rc_no_pacing) 11158 bbr->rc_no_pacing = 0; 11159 bbr->r_ctl.rc_bbr_state_time = cts; 11160 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_drain_pg; 11161 bbr->rc_bbr_state = BBR_STATE_DRAIN; 11162 bbr_set_state_target(bbr, __LINE__); 11163 if ((bbr->rc_use_google == 0) && 11164 bbr_slam_cwnd_in_main_drain) { 11165 /* Here we don't have to worry about probe-rtt */ 11166 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 11167 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11168 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11169 } 11170 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 11171 bbr_log_type_statechange(bbr, cts, __LINE__); 11172 if (ctf_flight_size(bbr->rc_tp, 11173 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 11174 bbr->r_ctl.rc_target_at_state) { 11175 /* 11176 * Switch to probe_bw if we are already 11177 * there 11178 */ 11179 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11180 bbr_substate_change(bbr, cts, __LINE__, 0); 11181 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11182 bbr_log_type_statechange(bbr, cts, __LINE__); 11183 } 11184 } 11185 } else if (bbr->rc_bbr_state == BBR_STATE_IDLE_EXIT) { 11186 uint32_t inflight; 11187 struct tcpcb *tp; 11188 11189 tp = bbr->rc_tp; 11190 inflight = ctf_flight_size(tp, 11191 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11192 if (inflight >= bbr->r_ctl.rc_target_at_state) { 11193 /* We have reached a flight of the cwnd target */ 11194 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11195 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11196 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 11197 bbr_set_state_target(bbr, __LINE__); 11198 /* 11199 * Rig it so we don't do anything crazy and 11200 * start fresh with a new randomization. 11201 */ 11202 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 11203 bbr->rc_bbr_substate = BBR_SUB_LEVEL6; 11204 bbr_substate_change(bbr, cts, __LINE__, 1); 11205 } 11206 } else if (bbr->rc_bbr_state == BBR_STATE_DRAIN) { 11207 /* Has in-flight reached the bdp (or less)? */ 11208 uint32_t inflight; 11209 struct tcpcb *tp; 11210 11211 tp = bbr->rc_tp; 11212 inflight = ctf_flight_size(tp, 11213 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11214 if ((bbr->rc_use_google == 0) && 11215 bbr_slam_cwnd_in_main_drain && 11216 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11217 /* 11218 * Here we don't have to worry about probe-rtt 11219 * re-slam it, but keep it slammed down. 11220 */ 11221 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11222 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11223 } 11224 if (inflight <= bbr->r_ctl.rc_target_at_state) { 11225 /* We have drained */ 11226 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11227 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11228 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11229 uint32_t time_in; 11230 11231 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11232 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11233 } 11234 if ((bbr->rc_use_google == 0) && 11235 bbr_slam_cwnd_in_main_drain && 11236 (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 11237 /* Restore the cwnd */ 11238 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 11239 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11240 } 11241 /* Setup probe-rtt has being done now RRS-HERE */ 11242 bbr->r_ctl.rc_rtt_shrinks = cts; 11243 bbr->r_ctl.last_in_probertt = cts; 11244 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_LEAVE_DRAIN, 0); 11245 /* Randomly pick a sub-state */ 11246 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11247 bbr_substate_change(bbr, cts, __LINE__, 0); 11248 bbr_log_type_statechange(bbr, cts, __LINE__); 11249 } 11250 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) { 11251 uint32_t flight; 11252 11253 flight = ctf_flight_size(bbr->rc_tp, 11254 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11255 bbr->r_ctl.r_app_limited_until = (flight + bbr->r_ctl.rc_delivered); 11256 if (((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google) && 11257 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11258 /* 11259 * We must keep cwnd at the desired MSS. 11260 */ 11261 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 11262 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11263 } else if ((bbr_prtt_slam_cwnd) && 11264 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11265 /* Re-slam it */ 11266 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11267 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11268 } 11269 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) { 11270 /* Has outstanding reached our target? */ 11271 if (flight <= bbr->r_ctl.rc_target_at_state) { 11272 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_REACHTAR, 0); 11273 bbr->r_ctl.rc_bbr_enters_probertt = cts; 11274 /* If time is exactly 0, be 1usec off */ 11275 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) 11276 bbr->r_ctl.rc_bbr_enters_probertt = 1; 11277 if (bbr->rc_use_google == 0) { 11278 /* 11279 * Restore any lowering that as occurred to 11280 * reach here 11281 */ 11282 if (bbr->r_ctl.bbr_rttprobe_gain_val) 11283 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 11284 else 11285 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11286 } 11287 } 11288 if ((bbr->r_ctl.rc_bbr_enters_probertt == 0) && 11289 (bbr->rc_use_google == 0) && 11290 bbr->r_ctl.bbr_rttprobe_gain_val && 11291 (((cts - bbr->r_ctl.rc_probertt_srttchktim) > bbr_get_rtt(bbr, bbr_drain_rtt)) || 11292 (flight >= bbr->r_ctl.flightsize_at_drain))) { 11293 /* 11294 * We have doddled with our current hptsi 11295 * gain an srtt and have still not made it 11296 * to target, or we have increased our flight. 11297 * Lets reduce the gain by xx% 11298 * flooring the reduce at DRAIN (based on 11299 * mul/div) 11300 */ 11301 int red; 11302 11303 bbr->r_ctl.flightsize_at_drain = flight; 11304 bbr->r_ctl.rc_probertt_srttchktim = cts; 11305 red = max((bbr->r_ctl.bbr_rttprobe_gain_val / 10), 1); 11306 if ((bbr->r_ctl.rc_bbr_hptsi_gain - red) > max(bbr_drain_floor, 1)) { 11307 /* Reduce our gain again */ 11308 bbr->r_ctl.rc_bbr_hptsi_gain -= red; 11309 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG, 0); 11310 } else if (bbr->r_ctl.rc_bbr_hptsi_gain > max(bbr_drain_floor, 1)) { 11311 /* one more chance before we give up */ 11312 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 11313 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG_FINAL, 0); 11314 } else { 11315 /* At the very bottom */ 11316 bbr->r_ctl.rc_bbr_hptsi_gain = max((bbr_drain_floor-1), 1); 11317 } 11318 } 11319 } 11320 if (bbr->r_ctl.rc_bbr_enters_probertt && 11321 (TSTMP_GT(cts, bbr->r_ctl.rc_bbr_enters_probertt)) && 11322 ((cts - bbr->r_ctl.rc_bbr_enters_probertt) >= bbr_rtt_probe_time)) { 11323 /* Time to exit probe RTT normally */ 11324 bbr_exit_probe_rtt(bbr->rc_tp, bbr, cts); 11325 } 11326 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 11327 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 11328 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 11329 /* 11330 * This qualifies as a RTT_PROBE session since we 11331 * drop the data outstanding to nothing and waited 11332 * more than bbr_rtt_probe_time. 11333 */ 11334 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11335 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11336 } 11337 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11338 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11339 } else { 11340 bbr_set_probebw_gains(bbr, cts, losses); 11341 } 11342 } 11343 } 11344 11345 static void 11346 bbr_check_bbr_for_state(struct tcp_bbr *bbr, uint32_t cts, int32_t line, uint32_t losses) 11347 { 11348 int32_t epoch = 0; 11349 11350 if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 11351 bbr_set_epoch(bbr, cts, line); 11352 /* At each epoch doe lt bw sampling */ 11353 epoch = 1; 11354 } 11355 bbr_state_change(bbr, cts, epoch, bbr->rc_is_pkt_epoch_now, losses); 11356 } 11357 11358 static int 11359 bbr_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so, 11360 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, 11361 int32_t nxt_pkt, struct timeval *tv) 11362 { 11363 int32_t thflags, retval; 11364 uint32_t cts, lcts; 11365 uint32_t tiwin; 11366 struct tcpopt to; 11367 struct tcp_bbr *bbr; 11368 struct bbr_sendmap *rsm; 11369 struct timeval ltv; 11370 int32_t did_out = 0; 11371 int32_t in_recovery; 11372 uint16_t nsegs; 11373 int32_t prev_state; 11374 uint32_t lost; 11375 11376 nsegs = max(1, m->m_pkthdr.lro_nsegs); 11377 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 11378 /* add in our stats */ 11379 kern_prefetch(bbr, &prev_state); 11380 prev_state = 0; 11381 thflags = th->th_flags; 11382 /* 11383 * If this is either a state-changing packet or current state isn't 11384 * established, we require a write lock on tcbinfo. Otherwise, we 11385 * allow the tcbinfo to be in either alocked or unlocked, as the 11386 * caller may have unnecessarily acquired a write lock due to a 11387 * race. 11388 */ 11389 INP_WLOCK_ASSERT(tp->t_inpcb); 11390 KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN", 11391 __func__)); 11392 KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT", 11393 __func__)); 11394 11395 tp->t_rcvtime = ticks; 11396 /* 11397 * Unscale the window into a 32-bit value. For the SYN_SENT state 11398 * the scale is zero. 11399 */ 11400 tiwin = th->th_win << tp->snd_scale; 11401 #ifdef STATS 11402 stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin); 11403 #endif 11404 11405 if (m->m_flags & M_TSTMP) { 11406 /* Prefer the hardware timestamp if present */ 11407 struct timespec ts; 11408 11409 mbuf_tstmp2timespec(m, &ts); 11410 bbr->rc_tv.tv_sec = ts.tv_sec; 11411 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11412 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11413 } else if (m->m_flags & M_TSTMP_LRO) { 11414 /* Next the arrival timestamp */ 11415 struct timespec ts; 11416 11417 mbuf_tstmp2timespec(m, &ts); 11418 bbr->rc_tv.tv_sec = ts.tv_sec; 11419 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11420 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11421 } else { 11422 /* 11423 * Ok just get the current time. 11424 */ 11425 bbr->r_ctl.rc_rcvtime = lcts = cts = tcp_get_usecs(&bbr->rc_tv); 11426 } 11427 /* 11428 * Parse options on any incoming segment. 11429 */ 11430 tcp_dooptions(&to, (u_char *)(th + 1), 11431 (th->th_off << 2) - sizeof(struct tcphdr), 11432 (thflags & TH_SYN) ? TO_SYN : 0); 11433 11434 /* 11435 * If timestamps were negotiated during SYN/ACK and a 11436 * segment without a timestamp is received, silently drop 11437 * the segment, unless it is a RST segment or missing timestamps are 11438 * tolerated. 11439 * See section 3.2 of RFC 7323. 11440 */ 11441 if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) && 11442 ((thflags & TH_RST) == 0) && (V_tcp_tolerate_missing_ts == 0)) { 11443 retval = 0; 11444 m_freem(m); 11445 goto done_with_input; 11446 } 11447 /* 11448 * If echoed timestamp is later than the current time, fall back to 11449 * non RFC1323 RTT calculation. Normalize timestamp if syncookies 11450 * were used when this connection was established. 11451 */ 11452 if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) { 11453 to.to_tsecr -= tp->ts_offset; 11454 if (TSTMP_GT(to.to_tsecr, tcp_tv_to_mssectick(&bbr->rc_tv))) 11455 to.to_tsecr = 0; 11456 } 11457 /* 11458 * If its the first time in we need to take care of options and 11459 * verify we can do SACK for rack! 11460 */ 11461 if (bbr->r_state == 0) { 11462 /* 11463 * Process options only when we get SYN/ACK back. The SYN 11464 * case for incoming connections is handled in tcp_syncache. 11465 * According to RFC1323 the window field in a SYN (i.e., a 11466 * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX 11467 * this is traditional behavior, may need to be cleaned up. 11468 */ 11469 if (bbr->rc_inp == NULL) { 11470 bbr->rc_inp = tp->t_inpcb; 11471 } 11472 /* 11473 * We need to init rc_inp here since its not init'd when 11474 * bbr_init is called 11475 */ 11476 if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { 11477 if ((to.to_flags & TOF_SCALE) && 11478 (tp->t_flags & TF_REQ_SCALE)) { 11479 tp->t_flags |= TF_RCVD_SCALE; 11480 tp->snd_scale = to.to_wscale; 11481 } else 11482 tp->t_flags &= ~TF_REQ_SCALE; 11483 /* 11484 * Initial send window. It will be updated with the 11485 * next incoming segment to the scaled value. 11486 */ 11487 tp->snd_wnd = th->th_win; 11488 if ((to.to_flags & TOF_TS) && 11489 (tp->t_flags & TF_REQ_TSTMP)) { 11490 tp->t_flags |= TF_RCVD_TSTMP; 11491 tp->ts_recent = to.to_tsval; 11492 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 11493 } else 11494 tp->t_flags &= ~TF_REQ_TSTMP; 11495 if (to.to_flags & TOF_MSS) 11496 tcp_mss(tp, to.to_mss); 11497 if ((tp->t_flags & TF_SACK_PERMIT) && 11498 (to.to_flags & TOF_SACKPERM) == 0) 11499 tp->t_flags &= ~TF_SACK_PERMIT; 11500 if (IS_FASTOPEN(tp->t_flags)) { 11501 if (to.to_flags & TOF_FASTOPEN) { 11502 uint16_t mss; 11503 11504 if (to.to_flags & TOF_MSS) 11505 mss = to.to_mss; 11506 else 11507 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) 11508 mss = TCP6_MSS; 11509 else 11510 mss = TCP_MSS; 11511 tcp_fastopen_update_cache(tp, mss, 11512 to.to_tfo_len, to.to_tfo_cookie); 11513 } else 11514 tcp_fastopen_disable_path(tp); 11515 } 11516 } 11517 /* 11518 * At this point we are at the initial call. Here we decide 11519 * if we are doing RACK or not. We do this by seeing if 11520 * TF_SACK_PERMIT is set, if not rack is *not* possible and 11521 * we switch to the default code. 11522 */ 11523 if ((tp->t_flags & TF_SACK_PERMIT) == 0) { 11524 /* Bail */ 11525 tcp_switch_back_to_default(tp); 11526 (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen, 11527 tlen, iptos); 11528 return (1); 11529 } 11530 /* Set the flag */ 11531 bbr->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; 11532 tcp_set_hpts(tp->t_inpcb); 11533 sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack); 11534 } 11535 if (thflags & TH_ACK) { 11536 /* Track ack types */ 11537 if (to.to_flags & TOF_SACK) 11538 BBR_STAT_INC(bbr_acks_with_sacks); 11539 else 11540 BBR_STAT_INC(bbr_plain_acks); 11541 } 11542 /* 11543 * This is the one exception case where we set the rack state 11544 * always. All other times (timers etc) we must have a rack-state 11545 * set (so we assure we have done the checks above for SACK). 11546 */ 11547 if (thflags & TH_FIN) 11548 tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN); 11549 if (bbr->r_state != tp->t_state) 11550 bbr_set_state(tp, bbr, tiwin); 11551 11552 if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map)) != NULL) 11553 kern_prefetch(rsm, &prev_state); 11554 prev_state = bbr->r_state; 11555 bbr->rc_ack_was_delayed = 0; 11556 lost = bbr->r_ctl.rc_lost; 11557 bbr->rc_is_pkt_epoch_now = 0; 11558 if (m->m_flags & (M_TSTMP|M_TSTMP_LRO)) { 11559 /* Get the real time into lcts and figure the real delay */ 11560 lcts = tcp_get_usecs(<v); 11561 if (TSTMP_GT(lcts, cts)) { 11562 bbr->r_ctl.rc_ack_hdwr_delay = lcts - cts; 11563 bbr->rc_ack_was_delayed = 1; 11564 if (TSTMP_GT(bbr->r_ctl.rc_ack_hdwr_delay, 11565 bbr->r_ctl.highest_hdwr_delay)) 11566 bbr->r_ctl.highest_hdwr_delay = bbr->r_ctl.rc_ack_hdwr_delay; 11567 } else { 11568 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11569 bbr->rc_ack_was_delayed = 0; 11570 } 11571 } else { 11572 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11573 bbr->rc_ack_was_delayed = 0; 11574 } 11575 bbr_log_ack_event(bbr, th, &to, tlen, nsegs, cts, nxt_pkt, m); 11576 if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { 11577 retval = 0; 11578 m_freem(m); 11579 goto done_with_input; 11580 } 11581 /* 11582 * If a segment with the ACK-bit set arrives in the SYN-SENT state 11583 * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. 11584 */ 11585 if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && 11586 (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { 11587 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 11588 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 11589 return (1); 11590 } 11591 in_recovery = IN_RECOVERY(tp->t_flags); 11592 if (tiwin > bbr->r_ctl.rc_high_rwnd) 11593 bbr->r_ctl.rc_high_rwnd = tiwin; 11594 #ifdef BBR_INVARIANTS 11595 if ((tp->t_inpcb->inp_flags & INP_DROPPED) || 11596 (tp->t_inpcb->inp_flags2 & INP_FREED)) { 11597 panic("tp:%p bbr:%p given a dropped inp:%p", 11598 tp, bbr, tp->t_inpcb); 11599 } 11600 #endif 11601 bbr->r_ctl.rc_flight_at_input = ctf_flight_size(tp, 11602 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11603 bbr->rtt_valid = 0; 11604 if (to.to_flags & TOF_TS) { 11605 bbr->rc_ts_valid = 1; 11606 bbr->r_ctl.last_inbound_ts = to.to_tsval; 11607 } else { 11608 bbr->rc_ts_valid = 0; 11609 bbr->r_ctl.last_inbound_ts = 0; 11610 } 11611 retval = (*bbr->r_substate) (m, th, so, 11612 tp, &to, drop_hdrlen, 11613 tlen, tiwin, thflags, nxt_pkt, iptos); 11614 #ifdef BBR_INVARIANTS 11615 if ((retval == 0) && 11616 (tp->t_inpcb == NULL)) { 11617 panic("retval:%d tp:%p t_inpcb:NULL state:%d", 11618 retval, tp, prev_state); 11619 } 11620 #endif 11621 if (nxt_pkt == 0) 11622 BBR_STAT_INC(bbr_rlock_left_ret0); 11623 else 11624 BBR_STAT_INC(bbr_rlock_left_ret1); 11625 if (retval == 0) { 11626 /* 11627 * If retval is 1 the tcb is unlocked and most likely the tp 11628 * is gone. 11629 */ 11630 INP_WLOCK_ASSERT(tp->t_inpcb); 11631 tcp_bbr_xmit_timer_commit(bbr, tp, cts); 11632 if (bbr->rc_is_pkt_epoch_now) 11633 bbr_set_pktepoch(bbr, cts, __LINE__); 11634 bbr_check_bbr_for_state(bbr, cts, __LINE__, (bbr->r_ctl.rc_lost - lost)); 11635 if (nxt_pkt == 0) { 11636 if (bbr->r_wanted_output != 0) { 11637 bbr->rc_output_starts_timer = 0; 11638 did_out = 1; 11639 (void)tp->t_fb->tfb_tcp_output(tp); 11640 } else 11641 bbr_start_hpts_timer(bbr, tp, cts, 6, 0, 0); 11642 } 11643 if ((nxt_pkt == 0) && 11644 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && 11645 (SEQ_GT(tp->snd_max, tp->snd_una) || 11646 (tp->t_flags & TF_DELACK) || 11647 ((V_tcp_always_keepalive || bbr->rc_inp->inp_socket->so_options & SO_KEEPALIVE) && 11648 (tp->t_state <= TCPS_CLOSING)))) { 11649 /* 11650 * We could not send (probably in the hpts but 11651 * stopped the timer)? 11652 */ 11653 if ((tp->snd_max == tp->snd_una) && 11654 ((tp->t_flags & TF_DELACK) == 0) && 11655 (bbr->rc_inp->inp_in_hpts) && 11656 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 11657 /* 11658 * keep alive not needed if we are hptsi 11659 * output yet 11660 */ 11661 ; 11662 } else { 11663 if (bbr->rc_inp->inp_in_hpts) { 11664 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 11665 if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 11666 (TSTMP_GT(lcts, bbr->rc_pacer_started))) { 11667 uint32_t del; 11668 11669 del = lcts - bbr->rc_pacer_started; 11670 if (bbr->r_ctl.rc_last_delay_val > del) { 11671 BBR_STAT_INC(bbr_force_timer_start); 11672 bbr->r_ctl.rc_last_delay_val -= del; 11673 bbr->rc_pacer_started = lcts; 11674 } else { 11675 /* We are late */ 11676 bbr->r_ctl.rc_last_delay_val = 0; 11677 BBR_STAT_INC(bbr_force_output); 11678 (void)tp->t_fb->tfb_tcp_output(tp); 11679 } 11680 } 11681 } 11682 bbr_start_hpts_timer(bbr, tp, cts, 8, bbr->r_ctl.rc_last_delay_val, 11683 0); 11684 } 11685 } else if ((bbr->rc_output_starts_timer == 0) && (nxt_pkt == 0)) { 11686 /* Do we have the correct timer running? */ 11687 bbr_timer_audit(tp, bbr, lcts, &so->so_snd); 11688 } 11689 /* Do we have a new state */ 11690 if (bbr->r_state != tp->t_state) 11691 bbr_set_state(tp, bbr, tiwin); 11692 done_with_input: 11693 bbr_log_doseg_done(bbr, cts, nxt_pkt, did_out); 11694 if (did_out) 11695 bbr->r_wanted_output = 0; 11696 #ifdef BBR_INVARIANTS 11697 if (tp->t_inpcb == NULL) { 11698 panic("OP:%d retval:%d tp:%p t_inpcb:NULL state:%d", 11699 did_out, 11700 retval, tp, prev_state); 11701 } 11702 #endif 11703 } 11704 return (retval); 11705 } 11706 11707 static void 11708 bbr_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, 11709 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos) 11710 { 11711 struct timeval tv; 11712 int retval; 11713 11714 /* First lets see if we have old packets */ 11715 if (tp->t_in_pkt) { 11716 if (ctf_do_queued_segments(so, tp, 1)) { 11717 m_freem(m); 11718 return; 11719 } 11720 } 11721 if (m->m_flags & M_TSTMP_LRO) { 11722 tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; 11723 tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; 11724 } else { 11725 /* Should not be should we kassert instead? */ 11726 tcp_get_usecs(&tv); 11727 } 11728 retval = bbr_do_segment_nounlock(m, th, so, tp, 11729 drop_hdrlen, tlen, iptos, 0, &tv); 11730 if (retval == 0) { 11731 INP_WUNLOCK(tp->t_inpcb); 11732 } 11733 } 11734 11735 /* 11736 * Return how much data can be sent without violating the 11737 * cwnd or rwnd. 11738 */ 11739 11740 static inline uint32_t 11741 bbr_what_can_we_send(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t sendwin, 11742 uint32_t avail, int32_t sb_offset, uint32_t cts) 11743 { 11744 uint32_t len; 11745 11746 if (ctf_outstanding(tp) >= tp->snd_wnd) { 11747 /* We never want to go over our peers rcv-window */ 11748 len = 0; 11749 } else { 11750 uint32_t flight; 11751 11752 flight = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11753 if (flight >= sendwin) { 11754 /* 11755 * We have in flight what we are allowed by cwnd (if 11756 * it was rwnd blocking it would have hit above out 11757 * >= tp->snd_wnd). 11758 */ 11759 return (0); 11760 } 11761 len = sendwin - flight; 11762 if ((len + ctf_outstanding(tp)) > tp->snd_wnd) { 11763 /* We would send too much (beyond the rwnd) */ 11764 len = tp->snd_wnd - ctf_outstanding(tp); 11765 } 11766 if ((len + sb_offset) > avail) { 11767 /* 11768 * We don't have that much in the SB, how much is 11769 * there? 11770 */ 11771 len = avail - sb_offset; 11772 } 11773 } 11774 return (len); 11775 } 11776 11777 static inline void 11778 bbr_do_error_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11779 { 11780 #ifdef NETFLIX_STATS 11781 KMOD_TCPSTAT_INC(tcps_sndpack_error); 11782 KMOD_TCPSTAT_ADD(tcps_sndbyte_error, len); 11783 #endif 11784 } 11785 11786 static inline void 11787 bbr_do_send_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11788 { 11789 if (error) { 11790 bbr_do_error_accounting(tp, bbr, rsm, len, error); 11791 return; 11792 } 11793 if (rsm) { 11794 if (rsm->r_flags & BBR_TLP) { 11795 /* 11796 * TLP should not count in retran count, but in its 11797 * own bin 11798 */ 11799 #ifdef NETFLIX_STATS 11800 KMOD_TCPSTAT_INC(tcps_tlpresends); 11801 KMOD_TCPSTAT_ADD(tcps_tlpresend_bytes, len); 11802 #endif 11803 } else { 11804 /* Retransmit */ 11805 tp->t_sndrexmitpack++; 11806 KMOD_TCPSTAT_INC(tcps_sndrexmitpack); 11807 KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len); 11808 #ifdef STATS 11809 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB, 11810 len); 11811 #endif 11812 } 11813 /* 11814 * Logs in 0 - 8, 8 is all non probe_bw states 0-7 is 11815 * sub-state 11816 */ 11817 counter_u64_add(bbr_state_lost[rsm->r_bbr_state], len); 11818 if (bbr->rc_bbr_state != BBR_STATE_PROBE_BW) { 11819 /* Non probe_bw log in 1, 2, or 4. */ 11820 counter_u64_add(bbr_state_resend[bbr->rc_bbr_state], len); 11821 } else { 11822 /* 11823 * Log our probe state 3, and log also 5-13 to show 11824 * us the recovery sub-state for the send. This 11825 * means that 3 == (5+6+7+8+9+10+11+12+13) 11826 */ 11827 counter_u64_add(bbr_state_resend[BBR_STATE_PROBE_BW], len); 11828 counter_u64_add(bbr_state_resend[(bbr_state_val(bbr) + 5)], len); 11829 } 11830 /* Place in both 16's the totals of retransmitted */ 11831 counter_u64_add(bbr_state_lost[16], len); 11832 counter_u64_add(bbr_state_resend[16], len); 11833 /* Place in 17's the total sent */ 11834 counter_u64_add(bbr_state_resend[17], len); 11835 counter_u64_add(bbr_state_lost[17], len); 11836 11837 } else { 11838 /* New sends */ 11839 KMOD_TCPSTAT_INC(tcps_sndpack); 11840 KMOD_TCPSTAT_ADD(tcps_sndbyte, len); 11841 /* Place in 17's the total sent */ 11842 counter_u64_add(bbr_state_resend[17], len); 11843 counter_u64_add(bbr_state_lost[17], len); 11844 #ifdef STATS 11845 stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB, 11846 len); 11847 #endif 11848 } 11849 } 11850 11851 static void 11852 bbr_cwnd_limiting(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t in_level) 11853 { 11854 if (bbr->rc_filled_pipe && bbr_target_cwnd_mult_limit && (bbr->rc_use_google == 0)) { 11855 /* 11856 * Limit the cwnd to not be above N x the target plus whats 11857 * is outstanding. The target is based on the current b/w 11858 * estimate. 11859 */ 11860 uint32_t target; 11861 11862 target = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), BBR_UNIT); 11863 target += ctf_outstanding(tp); 11864 target *= bbr_target_cwnd_mult_limit; 11865 if (tp->snd_cwnd > target) 11866 tp->snd_cwnd = target; 11867 bbr_log_type_cwndupd(bbr, 0, 0, 0, 10, 0, 0, __LINE__); 11868 } 11869 } 11870 11871 static int 11872 bbr_window_update_needed(struct tcpcb *tp, struct socket *so, uint32_t recwin, int32_t maxseg) 11873 { 11874 /* 11875 * "adv" is the amount we could increase the window, taking into 11876 * account that we are limited by TCP_MAXWIN << tp->rcv_scale. 11877 */ 11878 int32_t adv; 11879 int32_t oldwin; 11880 11881 adv = recwin; 11882 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) { 11883 oldwin = (tp->rcv_adv - tp->rcv_nxt); 11884 if (adv > oldwin) 11885 adv -= oldwin; 11886 else { 11887 /* We can't increase the window */ 11888 adv = 0; 11889 } 11890 } else 11891 oldwin = 0; 11892 11893 /* 11894 * If the new window size ends up being the same as or less 11895 * than the old size when it is scaled, then don't force 11896 * a window update. 11897 */ 11898 if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale) 11899 return (0); 11900 11901 if (adv >= (2 * maxseg) && 11902 (adv >= (so->so_rcv.sb_hiwat / 4) || 11903 recwin <= (so->so_rcv.sb_hiwat / 8) || 11904 so->so_rcv.sb_hiwat <= 8 * maxseg)) { 11905 return (1); 11906 } 11907 if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) 11908 return (1); 11909 return (0); 11910 } 11911 11912 /* 11913 * Return 0 on success and a errno on failure to send. 11914 * Note that a 0 return may not mean we sent anything 11915 * if the TCB was on the hpts. A non-zero return 11916 * does indicate the error we got from ip[6]_output. 11917 */ 11918 static int 11919 bbr_output_wtime(struct tcpcb *tp, const struct timeval *tv) 11920 { 11921 struct socket *so; 11922 int32_t len; 11923 uint32_t cts; 11924 uint32_t recwin, sendwin; 11925 int32_t sb_offset; 11926 int32_t flags, abandon, error = 0; 11927 struct tcp_log_buffer *lgb = NULL; 11928 struct mbuf *m; 11929 struct mbuf *mb; 11930 uint32_t if_hw_tsomaxsegcount = 0; 11931 uint32_t if_hw_tsomaxsegsize = 0; 11932 uint32_t if_hw_tsomax = 0; 11933 struct ip *ip = NULL; 11934 #ifdef TCPDEBUG 11935 struct ipovly *ipov = NULL; 11936 #endif 11937 struct tcp_bbr *bbr; 11938 struct tcphdr *th; 11939 struct udphdr *udp = NULL; 11940 u_char opt[TCP_MAXOLEN]; 11941 unsigned ipoptlen, optlen, hdrlen; 11942 unsigned ulen; 11943 uint32_t bbr_seq; 11944 uint32_t delay_calc=0; 11945 uint8_t doing_tlp = 0; 11946 uint8_t local_options; 11947 #ifdef BBR_INVARIANTS 11948 uint8_t doing_retran_from = 0; 11949 uint8_t picked_up_retran = 0; 11950 #endif 11951 uint8_t wanted_cookie = 0; 11952 uint8_t more_to_rxt=0; 11953 int32_t prefetch_so_done = 0; 11954 int32_t prefetch_rsm = 0; 11955 uint32_t what_we_can = 0; 11956 uint32_t tot_len = 0; 11957 uint32_t rtr_cnt = 0; 11958 uint32_t maxseg, pace_max_segs, p_maxseg; 11959 int32_t csum_flags; 11960 int32_t hw_tls; 11961 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 11962 unsigned ipsec_optlen = 0; 11963 11964 #endif 11965 volatile int32_t sack_rxmit; 11966 struct bbr_sendmap *rsm = NULL; 11967 int32_t tso, mtu; 11968 struct tcpopt to; 11969 int32_t slot = 0; 11970 struct inpcb *inp; 11971 struct sockbuf *sb; 11972 uint32_t hpts_calling; 11973 #ifdef INET6 11974 struct ip6_hdr *ip6 = NULL; 11975 int32_t isipv6; 11976 #endif 11977 uint8_t app_limited = BBR_JR_SENT_DATA; 11978 uint8_t filled_all = 0; 11979 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 11980 /* We take a cache hit here */ 11981 memcpy(&bbr->rc_tv, tv, sizeof(struct timeval)); 11982 cts = tcp_tv_to_usectick(&bbr->rc_tv); 11983 inp = bbr->rc_inp; 11984 so = inp->inp_socket; 11985 sb = &so->so_snd; 11986 if (sb->sb_flags & SB_TLS_IFNET) 11987 hw_tls = 1; 11988 else 11989 hw_tls = 0; 11990 kern_prefetch(sb, &maxseg); 11991 maxseg = tp->t_maxseg - bbr->rc_last_options; 11992 if (bbr_minseg(bbr) < maxseg) { 11993 tcp_bbr_tso_size_check(bbr, cts); 11994 } 11995 /* Remove any flags that indicate we are pacing on the inp */ 11996 pace_max_segs = bbr->r_ctl.rc_pace_max_segs; 11997 p_maxseg = min(maxseg, pace_max_segs); 11998 INP_WLOCK_ASSERT(inp); 11999 #ifdef TCP_OFFLOAD 12000 if (tp->t_flags & TF_TOE) 12001 return (tcp_offload_output(tp)); 12002 #endif 12003 12004 #ifdef INET6 12005 if (bbr->r_state) { 12006 /* Use the cache line loaded if possible */ 12007 isipv6 = bbr->r_is_v6; 12008 } else { 12009 isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 12010 } 12011 #endif 12012 if (((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) && 12013 inp->inp_in_hpts) { 12014 /* 12015 * We are on the hpts for some timer but not hptsi output. 12016 * Possibly remove from the hpts so we can send/recv etc. 12017 */ 12018 if ((tp->t_flags & TF_ACKNOW) == 0) { 12019 /* 12020 * No immediate demand right now to send an ack, but 12021 * the user may have read, making room for new data 12022 * (a window update). If so we may want to cancel 12023 * whatever timer is running (KEEP/DEL-ACK?) and 12024 * continue to send out a window update. Or we may 12025 * have gotten more data into the socket buffer to 12026 * send. 12027 */ 12028 recwin = lmin(lmax(sbspace(&so->so_rcv), 0), 12029 (long)TCP_MAXWIN << tp->rcv_scale); 12030 if ((bbr_window_update_needed(tp, so, recwin, maxseg) == 0) && 12031 ((tcp_outflags[tp->t_state] & TH_RST) == 0) && 12032 ((sbavail(sb) + ((tcp_outflags[tp->t_state] & TH_FIN) ? 1 : 0)) <= 12033 (tp->snd_max - tp->snd_una))) { 12034 /* 12035 * Nothing new to send and no window update 12036 * is needed to send. Lets just return and 12037 * let the timer-run off. 12038 */ 12039 return (0); 12040 } 12041 } 12042 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12043 bbr_timer_cancel(bbr, __LINE__, cts); 12044 } 12045 if (bbr->r_ctl.rc_last_delay_val) { 12046 /* Calculate a rough delay for early escape to sending */ 12047 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12048 delay_calc = cts - bbr->rc_pacer_started; 12049 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12050 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12051 else 12052 delay_calc = 0; 12053 } 12054 /* Mark that we have called bbr_output(). */ 12055 if ((bbr->r_timer_override) || 12056 (tp->t_state < TCPS_ESTABLISHED)) { 12057 /* Timeouts or early states are exempt */ 12058 if (inp->inp_in_hpts) 12059 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12060 } else if (inp->inp_in_hpts) { 12061 if ((bbr->r_ctl.rc_last_delay_val) && 12062 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 12063 delay_calc) { 12064 /* 12065 * We were being paced for output and the delay has 12066 * already exceeded when we were supposed to be 12067 * called, lets go ahead and pull out of the hpts 12068 * and call output. 12069 */ 12070 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_LATE], 1); 12071 bbr->r_ctl.rc_last_delay_val = 0; 12072 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12073 } else if (tp->t_state == TCPS_CLOSED) { 12074 bbr->r_ctl.rc_last_delay_val = 0; 12075 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12076 } else { 12077 /* 12078 * On the hpts, you shall not pass! even if ACKNOW 12079 * is on, we will when the hpts fires, unless of 12080 * course we are overdue. 12081 */ 12082 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_INPACE], 1); 12083 return (0); 12084 } 12085 } 12086 bbr->rc_cwnd_limited = 0; 12087 if (bbr->r_ctl.rc_last_delay_val) { 12088 /* recalculate the real delay and deal with over/under */ 12089 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12090 delay_calc = cts - bbr->rc_pacer_started; 12091 else 12092 delay_calc = 0; 12093 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12094 /* Setup the delay which will be added in */ 12095 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12096 else { 12097 /* 12098 * We are early setup to adjust 12099 * our slot time. 12100 */ 12101 uint64_t merged_val; 12102 12103 bbr->r_ctl.rc_agg_early += (bbr->r_ctl.rc_last_delay_val - delay_calc); 12104 bbr->r_agg_early_set = 1; 12105 if (bbr->r_ctl.rc_hptsi_agg_delay) { 12106 if (bbr->r_ctl.rc_hptsi_agg_delay >= bbr->r_ctl.rc_agg_early) { 12107 /* Nope our previous late cancels out the early */ 12108 bbr->r_ctl.rc_hptsi_agg_delay -= bbr->r_ctl.rc_agg_early; 12109 bbr->r_agg_early_set = 0; 12110 bbr->r_ctl.rc_agg_early = 0; 12111 } else { 12112 bbr->r_ctl.rc_agg_early -= bbr->r_ctl.rc_hptsi_agg_delay; 12113 bbr->r_ctl.rc_hptsi_agg_delay = 0; 12114 } 12115 } 12116 merged_val = bbr->rc_pacer_started; 12117 merged_val <<= 32; 12118 merged_val |= bbr->r_ctl.rc_last_delay_val; 12119 bbr_log_pacing_delay_calc(bbr, inp->inp_hpts_calls, 12120 bbr->r_ctl.rc_agg_early, cts, delay_calc, merged_val, 12121 bbr->r_agg_early_set, 3); 12122 bbr->r_ctl.rc_last_delay_val = 0; 12123 BBR_STAT_INC(bbr_early); 12124 delay_calc = 0; 12125 } 12126 } else { 12127 /* We were not delayed due to hptsi */ 12128 if (bbr->r_agg_early_set) 12129 bbr->r_ctl.rc_agg_early = 0; 12130 bbr->r_agg_early_set = 0; 12131 delay_calc = 0; 12132 } 12133 if (delay_calc) { 12134 /* 12135 * We had a hptsi delay which means we are falling behind on 12136 * sending at the expected rate. Calculate an extra amount 12137 * of data we can send, if any, to put us back on track. 12138 */ 12139 if ((bbr->r_ctl.rc_hptsi_agg_delay + delay_calc) < bbr->r_ctl.rc_hptsi_agg_delay) 12140 bbr->r_ctl.rc_hptsi_agg_delay = 0xffffffff; 12141 else 12142 bbr->r_ctl.rc_hptsi_agg_delay += delay_calc; 12143 } 12144 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12145 if ((tp->snd_una == tp->snd_max) && 12146 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 12147 (sbavail(sb))) { 12148 /* 12149 * Ok we have been idle with nothing outstanding 12150 * we possibly need to start fresh with either a new 12151 * suite of states or a fast-ramp up. 12152 */ 12153 bbr_restart_after_idle(bbr, 12154 cts, bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time)); 12155 } 12156 /* 12157 * Now was there a hptsi delay where we are behind? We only count 12158 * being behind if: a) We are not in recovery. b) There was a delay. 12159 * <and> c) We had room to send something. 12160 * 12161 */ 12162 hpts_calling = inp->inp_hpts_calls; 12163 inp->inp_hpts_calls = 0; 12164 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 12165 if (bbr_process_timers(tp, bbr, cts, hpts_calling)) { 12166 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_ATIMER], 1); 12167 return (0); 12168 } 12169 } 12170 bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 12171 if (hpts_calling && 12172 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 12173 bbr->r_ctl.rc_last_delay_val = 0; 12174 } 12175 bbr->r_timer_override = 0; 12176 bbr->r_wanted_output = 0; 12177 /* 12178 * For TFO connections in SYN_RECEIVED, only allow the initial 12179 * SYN|ACK and those sent by the retransmit timer. 12180 */ 12181 if (IS_FASTOPEN(tp->t_flags) && 12182 ((tp->t_state == TCPS_SYN_RECEIVED) || 12183 (tp->t_state == TCPS_SYN_SENT)) && 12184 SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN or SYN|ACK sent */ 12185 (tp->t_rxtshift == 0)) { /* not a retransmit */ 12186 len = 0; 12187 goto just_return_nolock; 12188 } 12189 /* 12190 * Before sending anything check for a state update. For hpts 12191 * calling without input this is important. If its input calling 12192 * then this was already done. 12193 */ 12194 if (bbr->rc_use_google == 0) 12195 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 12196 again: 12197 /* 12198 * If we've recently taken a timeout, snd_max will be greater than 12199 * snd_max. BBR in general does not pay much attention to snd_nxt 12200 * for historic reasons the persist timer still uses it. This means 12201 * we have to look at it. All retransmissions that are not persits 12202 * use the rsm that needs to be sent so snd_nxt is ignored. At the 12203 * end of this routine we pull snd_nxt always up to snd_max. 12204 */ 12205 doing_tlp = 0; 12206 #ifdef BBR_INVARIANTS 12207 doing_retran_from = picked_up_retran = 0; 12208 #endif 12209 error = 0; 12210 tso = 0; 12211 slot = 0; 12212 mtu = 0; 12213 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12214 sb_offset = tp->snd_max - tp->snd_una; 12215 flags = tcp_outflags[tp->t_state]; 12216 sack_rxmit = 0; 12217 len = 0; 12218 rsm = NULL; 12219 if (flags & TH_RST) { 12220 SOCKBUF_LOCK(sb); 12221 goto send; 12222 } 12223 recheck_resend: 12224 while (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { 12225 /* We need to always have one in reserve */ 12226 rsm = bbr_alloc(bbr); 12227 if (rsm == NULL) { 12228 error = ENOMEM; 12229 /* Lie to get on the hpts */ 12230 tot_len = tp->t_maxseg; 12231 if (hpts_calling) 12232 /* Retry in a ms */ 12233 slot = 1001; 12234 goto just_return_nolock; 12235 } 12236 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); 12237 bbr->r_ctl.rc_free_cnt++; 12238 rsm = NULL; 12239 } 12240 /* What do we send, a resend? */ 12241 if (bbr->r_ctl.rc_resend == NULL) { 12242 /* Check for rack timeout */ 12243 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 12244 if (bbr->r_ctl.rc_resend) { 12245 #ifdef BBR_INVARIANTS 12246 picked_up_retran = 1; 12247 #endif 12248 bbr_cong_signal(tp, NULL, CC_NDUPACK, bbr->r_ctl.rc_resend); 12249 } 12250 } 12251 if (bbr->r_ctl.rc_resend) { 12252 rsm = bbr->r_ctl.rc_resend; 12253 #ifdef BBR_INVARIANTS 12254 doing_retran_from = 1; 12255 #endif 12256 /* Remove any TLP flags its a RACK or T-O */ 12257 rsm->r_flags &= ~BBR_TLP; 12258 bbr->r_ctl.rc_resend = NULL; 12259 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 12260 #ifdef BBR_INVARIANTS 12261 panic("Huh, tp:%p bbr:%p rsm:%p start:%u < snd_una:%u\n", 12262 tp, bbr, rsm, rsm->r_start, tp->snd_una); 12263 goto recheck_resend; 12264 #else 12265 /* TSNH */ 12266 rsm = NULL; 12267 goto recheck_resend; 12268 #endif 12269 } 12270 rtr_cnt++; 12271 if (rsm->r_flags & BBR_HAS_SYN) { 12272 /* Only retransmit a SYN by itself */ 12273 len = 0; 12274 if ((flags & TH_SYN) == 0) { 12275 /* Huh something is wrong */ 12276 rsm->r_start++; 12277 if (rsm->r_start == rsm->r_end) { 12278 /* Clean it up, somehow we missed the ack? */ 12279 bbr_log_syn(tp, NULL); 12280 } else { 12281 /* TFO with data? */ 12282 rsm->r_flags &= ~BBR_HAS_SYN; 12283 len = rsm->r_end - rsm->r_start; 12284 } 12285 } else { 12286 /* Retransmitting SYN */ 12287 rsm = NULL; 12288 SOCKBUF_LOCK(sb); 12289 goto send; 12290 } 12291 } else 12292 len = rsm->r_end - rsm->r_start; 12293 if ((bbr->rc_resends_use_tso == 0) && 12294 (len > maxseg)) { 12295 len = maxseg; 12296 more_to_rxt = 1; 12297 } 12298 sb_offset = rsm->r_start - tp->snd_una; 12299 if (len > 0) { 12300 sack_rxmit = 1; 12301 KMOD_TCPSTAT_INC(tcps_sack_rexmits); 12302 KMOD_TCPSTAT_ADD(tcps_sack_rexmit_bytes, 12303 min(len, maxseg)); 12304 } else { 12305 /* I dont think this can happen */ 12306 rsm = NULL; 12307 goto recheck_resend; 12308 } 12309 BBR_STAT_INC(bbr_resends_set); 12310 } else if (bbr->r_ctl.rc_tlp_send) { 12311 /* 12312 * Tail loss probe 12313 */ 12314 doing_tlp = 1; 12315 rsm = bbr->r_ctl.rc_tlp_send; 12316 bbr->r_ctl.rc_tlp_send = NULL; 12317 sack_rxmit = 1; 12318 len = rsm->r_end - rsm->r_start; 12319 rtr_cnt++; 12320 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12321 len = maxseg; 12322 12323 if (SEQ_GT(tp->snd_una, rsm->r_start)) { 12324 #ifdef BBR_INVARIANTS 12325 panic("tp:%p bbc:%p snd_una:%u rsm:%p r_start:%u", 12326 tp, bbr, tp->snd_una, rsm, rsm->r_start); 12327 #else 12328 /* TSNH */ 12329 rsm = NULL; 12330 goto recheck_resend; 12331 #endif 12332 } 12333 sb_offset = rsm->r_start - tp->snd_una; 12334 BBR_STAT_INC(bbr_tlp_set); 12335 } 12336 /* 12337 * Enforce a connection sendmap count limit if set 12338 * as long as we are not retransmiting. 12339 */ 12340 if ((rsm == NULL) && 12341 (V_tcp_map_entries_limit > 0) && 12342 (bbr->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) { 12343 BBR_STAT_INC(bbr_alloc_limited); 12344 if (!bbr->alloc_limit_reported) { 12345 bbr->alloc_limit_reported = 1; 12346 BBR_STAT_INC(bbr_alloc_limited_conns); 12347 } 12348 goto just_return_nolock; 12349 } 12350 #ifdef BBR_INVARIANTS 12351 if (rsm && SEQ_LT(rsm->r_start, tp->snd_una)) { 12352 panic("tp:%p bbr:%p rsm:%p sb_offset:%u len:%u", 12353 tp, bbr, rsm, sb_offset, len); 12354 } 12355 #endif 12356 /* 12357 * Get standard flags, and add SYN or FIN if requested by 'hidden' 12358 * state flags. 12359 */ 12360 if (tp->t_flags & TF_NEEDFIN && (rsm == NULL)) 12361 flags |= TH_FIN; 12362 if (tp->t_flags & TF_NEEDSYN) 12363 flags |= TH_SYN; 12364 12365 if (rsm && (rsm->r_flags & BBR_HAS_FIN)) { 12366 /* we are retransmitting the fin */ 12367 len--; 12368 if (len) { 12369 /* 12370 * When retransmitting data do *not* include the 12371 * FIN. This could happen from a TLP probe if we 12372 * allowed data with a FIN. 12373 */ 12374 flags &= ~TH_FIN; 12375 } 12376 } else if (rsm) { 12377 if (flags & TH_FIN) 12378 flags &= ~TH_FIN; 12379 } 12380 if ((sack_rxmit == 0) && (prefetch_rsm == 0)) { 12381 void *end_rsm; 12382 12383 end_rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); 12384 if (end_rsm) 12385 kern_prefetch(end_rsm, &prefetch_rsm); 12386 prefetch_rsm = 1; 12387 } 12388 SOCKBUF_LOCK(sb); 12389 /* 12390 * If snd_nxt == snd_max and we have transmitted a FIN, the 12391 * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a 12392 * negative length. This can also occur when TCP opens up its 12393 * congestion window while receiving additional duplicate acks after 12394 * fast-retransmit because TCP will reset snd_nxt to snd_max after 12395 * the fast-retransmit. 12396 * 12397 * In the normal retransmit-FIN-only case, however, snd_nxt will be 12398 * set to snd_una, the sb_offset will be 0, and the length may wind 12399 * up 0. 12400 * 12401 * If sack_rxmit is true we are retransmitting from the scoreboard 12402 * in which case len is already set. 12403 */ 12404 if (sack_rxmit == 0) { 12405 uint32_t avail; 12406 12407 avail = sbavail(sb); 12408 if (SEQ_GT(tp->snd_max, tp->snd_una)) 12409 sb_offset = tp->snd_max - tp->snd_una; 12410 else 12411 sb_offset = 0; 12412 if (bbr->rc_tlp_new_data) { 12413 /* TLP is forcing out new data */ 12414 uint32_t tlplen; 12415 12416 doing_tlp = 1; 12417 tlplen = maxseg; 12418 12419 if (tlplen > (uint32_t)(avail - sb_offset)) { 12420 tlplen = (uint32_t)(avail - sb_offset); 12421 } 12422 if (tlplen > tp->snd_wnd) { 12423 len = tp->snd_wnd; 12424 } else { 12425 len = tlplen; 12426 } 12427 bbr->rc_tlp_new_data = 0; 12428 } else { 12429 what_we_can = len = bbr_what_can_we_send(tp, bbr, sendwin, avail, sb_offset, cts); 12430 if ((len < p_maxseg) && 12431 (bbr->rc_in_persist == 0) && 12432 (ctf_outstanding(tp) >= (2 * p_maxseg)) && 12433 ((avail - sb_offset) >= p_maxseg)) { 12434 /* 12435 * We are not completing whats in the socket 12436 * buffer (i.e. there is at least a segment 12437 * waiting to send) and we have 2 or more 12438 * segments outstanding. There is no sense 12439 * of sending a little piece. Lets defer and 12440 * and wait until we can send a whole 12441 * segment. 12442 */ 12443 len = 0; 12444 } 12445 if (bbr->rc_in_persist) { 12446 /* 12447 * We are in persists, figure out if 12448 * a retransmit is available (maybe the previous 12449 * persists we sent) or if we have to send new 12450 * data. 12451 */ 12452 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 12453 if (rsm) { 12454 len = rsm->r_end - rsm->r_start; 12455 if (rsm->r_flags & BBR_HAS_FIN) 12456 len--; 12457 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12458 len = maxseg; 12459 if (len > 1) 12460 BBR_STAT_INC(bbr_persist_reneg); 12461 /* 12462 * XXXrrs we could force the len to 12463 * 1 byte here to cause the chunk to 12464 * split apart.. but that would then 12465 * mean we always retransmit it as 12466 * one byte even after the window 12467 * opens. 12468 */ 12469 sack_rxmit = 1; 12470 sb_offset = rsm->r_start - tp->snd_una; 12471 } else { 12472 /* 12473 * First time through in persists or peer 12474 * acked our one byte. Though we do have 12475 * to have something in the sb. 12476 */ 12477 len = 1; 12478 sb_offset = 0; 12479 if (avail == 0) 12480 len = 0; 12481 } 12482 } 12483 } 12484 } 12485 if (prefetch_so_done == 0) { 12486 kern_prefetch(so, &prefetch_so_done); 12487 prefetch_so_done = 1; 12488 } 12489 /* 12490 * Lop off SYN bit if it has already been sent. However, if this is 12491 * SYN-SENT state and if segment contains data and if we don't know 12492 * that foreign host supports TAO, suppress sending segment. 12493 */ 12494 if ((flags & TH_SYN) && (rsm == NULL) && 12495 SEQ_GT(tp->snd_max, tp->snd_una)) { 12496 if (tp->t_state != TCPS_SYN_RECEIVED) 12497 flags &= ~TH_SYN; 12498 /* 12499 * When sending additional segments following a TFO SYN|ACK, 12500 * do not include the SYN bit. 12501 */ 12502 if (IS_FASTOPEN(tp->t_flags) && 12503 (tp->t_state == TCPS_SYN_RECEIVED)) 12504 flags &= ~TH_SYN; 12505 sb_offset--, len++; 12506 if (sbavail(sb) == 0) 12507 len = 0; 12508 } else if ((flags & TH_SYN) && rsm) { 12509 /* 12510 * Subtract one from the len for the SYN being 12511 * retransmitted. 12512 */ 12513 len--; 12514 } 12515 /* 12516 * Be careful not to send data and/or FIN on SYN segments. This 12517 * measure is needed to prevent interoperability problems with not 12518 * fully conformant TCP implementations. 12519 */ 12520 if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) { 12521 len = 0; 12522 flags &= ~TH_FIN; 12523 } 12524 /* 12525 * On TFO sockets, ensure no data is sent in the following cases: 12526 * 12527 * - When retransmitting SYN|ACK on a passively-created socket 12528 * - When retransmitting SYN on an actively created socket 12529 * - When sending a zero-length cookie (cookie request) on an 12530 * actively created socket 12531 * - When the socket is in the CLOSED state (RST is being sent) 12532 */ 12533 if (IS_FASTOPEN(tp->t_flags) && 12534 (((flags & TH_SYN) && (tp->t_rxtshift > 0)) || 12535 ((tp->t_state == TCPS_SYN_SENT) && 12536 (tp->t_tfo_client_cookie_len == 0)) || 12537 (flags & TH_RST))) { 12538 len = 0; 12539 sack_rxmit = 0; 12540 rsm = NULL; 12541 } 12542 /* Without fast-open there should never be data sent on a SYN */ 12543 if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) 12544 len = 0; 12545 if (len <= 0) { 12546 /* 12547 * If FIN has been sent but not acked, but we haven't been 12548 * called to retransmit, len will be < 0. Otherwise, window 12549 * shrank after we sent into it. If window shrank to 0, 12550 * cancel pending retransmit, pull snd_nxt back to (closed) 12551 * window, and set the persist timer if it isn't already 12552 * going. If the window didn't close completely, just wait 12553 * for an ACK. 12554 * 12555 * We also do a general check here to ensure that we will 12556 * set the persist timer when we have data to send, but a 12557 * 0-byte window. This makes sure the persist timer is set 12558 * even if the packet hits one of the "goto send" lines 12559 * below. 12560 */ 12561 len = 0; 12562 if ((tp->snd_wnd == 0) && 12563 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12564 (tp->snd_una == tp->snd_max) && 12565 (sb_offset < (int)sbavail(sb))) { 12566 /* 12567 * Not enough room in the rwnd to send 12568 * a paced segment out. 12569 */ 12570 bbr_enter_persist(tp, bbr, cts, __LINE__); 12571 } 12572 } else if ((rsm == NULL) && 12573 (doing_tlp == 0) && 12574 (len < bbr->r_ctl.rc_pace_max_segs)) { 12575 /* 12576 * We are not sending a full segment for 12577 * some reason. Should we not send anything (think 12578 * sws or persists)? 12579 */ 12580 if ((tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12581 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12582 (len < (int)(sbavail(sb) - sb_offset))) { 12583 /* 12584 * Here the rwnd is less than 12585 * the pacing size, this is not a retransmit, 12586 * we are established and 12587 * the send is not the last in the socket buffer 12588 * lets not send, and possibly enter persists. 12589 */ 12590 len = 0; 12591 if (tp->snd_max == tp->snd_una) 12592 bbr_enter_persist(tp, bbr, cts, __LINE__); 12593 } else if ((tp->snd_cwnd >= bbr->r_ctl.rc_pace_max_segs) && 12594 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12595 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12596 (len < (int)(sbavail(sb) - sb_offset)) && 12597 (len < bbr_minseg(bbr))) { 12598 /* 12599 * Here we are not retransmitting, and 12600 * the cwnd is not so small that we could 12601 * not send at least a min size (rxt timer 12602 * not having gone off), We have 2 segments or 12603 * more already in flight, its not the tail end 12604 * of the socket buffer and the cwnd is blocking 12605 * us from sending out minimum pacing segment size. 12606 * Lets not send anything. 12607 */ 12608 bbr->rc_cwnd_limited = 1; 12609 len = 0; 12610 } else if (((tp->snd_wnd - ctf_outstanding(tp)) < 12611 min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12612 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12613 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12614 (len < (int)(sbavail(sb) - sb_offset)) && 12615 (TCPS_HAVEESTABLISHED(tp->t_state))) { 12616 /* 12617 * Here we have a send window but we have 12618 * filled it up and we can't send another pacing segment. 12619 * We also have in flight more than 2 segments 12620 * and we are not completing the sb i.e. we allow 12621 * the last bytes of the sb to go out even if 12622 * its not a full pacing segment. 12623 */ 12624 len = 0; 12625 } 12626 } 12627 /* len will be >= 0 after this point. */ 12628 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 12629 tcp_sndbuf_autoscale(tp, so, sendwin); 12630 /* 12631 * 12632 */ 12633 if (bbr->rc_in_persist && 12634 len && 12635 (rsm == NULL) && 12636 (len < min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs))) { 12637 /* 12638 * We are in persist, not doing a retransmit and don't have enough space 12639 * yet to send a full TSO. So is it at the end of the sb 12640 * if so we need to send else nuke to 0 and don't send. 12641 */ 12642 int sbleft; 12643 if (sbavail(sb) > sb_offset) 12644 sbleft = sbavail(sb) - sb_offset; 12645 else 12646 sbleft = 0; 12647 if (sbleft >= min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs)) { 12648 /* not at end of sb lets not send */ 12649 len = 0; 12650 } 12651 } 12652 /* 12653 * Decide if we can use TCP Segmentation Offloading (if supported by 12654 * hardware). 12655 * 12656 * TSO may only be used if we are in a pure bulk sending state. The 12657 * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP 12658 * options prevent using TSO. With TSO the TCP header is the same 12659 * (except for the sequence number) for all generated packets. This 12660 * makes it impossible to transmit any options which vary per 12661 * generated segment or packet. 12662 * 12663 * IPv4 handling has a clear separation of ip options and ip header 12664 * flags while IPv6 combines both in in6p_outputopts. ip6_optlen() 12665 * does the right thing below to provide length of just ip options 12666 * and thus checking for ipoptlen is enough to decide if ip options 12667 * are present. 12668 */ 12669 #ifdef INET6 12670 if (isipv6) 12671 ipoptlen = ip6_optlen(inp); 12672 else 12673 #endif 12674 if (inp->inp_options) 12675 ipoptlen = inp->inp_options->m_len - 12676 offsetof(struct ipoption, ipopt_list); 12677 else 12678 ipoptlen = 0; 12679 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12680 /* 12681 * Pre-calculate here as we save another lookup into the darknesses 12682 * of IPsec that way and can actually decide if TSO is ok. 12683 */ 12684 #ifdef INET6 12685 if (isipv6 && IPSEC_ENABLED(ipv6)) 12686 ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp); 12687 #ifdef INET 12688 else 12689 #endif 12690 #endif /* INET6 */ 12691 #ifdef INET 12692 if (IPSEC_ENABLED(ipv4)) 12693 ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp); 12694 #endif /* INET */ 12695 #endif /* IPSEC */ 12696 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12697 ipoptlen += ipsec_optlen; 12698 #endif 12699 if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && 12700 (len > maxseg) && 12701 (tp->t_port == 0) && 12702 ((tp->t_flags & TF_SIGNATURE) == 0) && 12703 tp->rcv_numsacks == 0 && 12704 ipoptlen == 0) 12705 tso = 1; 12706 12707 recwin = lmin(lmax(sbspace(&so->so_rcv), 0), 12708 (long)TCP_MAXWIN << tp->rcv_scale); 12709 /* 12710 * Sender silly window avoidance. We transmit under the following 12711 * conditions when len is non-zero: 12712 * 12713 * - We have a full segment (or more with TSO) - This is the last 12714 * buffer in a write()/send() and we are either idle or running 12715 * NODELAY - we've timed out (e.g. persist timer) - we have more 12716 * then 1/2 the maximum send window's worth of data (receiver may be 12717 * limited the window size) - we need to retransmit 12718 */ 12719 if (rsm) 12720 goto send; 12721 if (len) { 12722 if (sack_rxmit) 12723 goto send; 12724 if (len >= p_maxseg) 12725 goto send; 12726 /* 12727 * NOTE! on localhost connections an 'ack' from the remote 12728 * end may occur synchronously with the output and cause us 12729 * to flush a buffer queued with moretocome. XXX 12730 * 12731 */ 12732 if (((tp->t_flags & TF_MORETOCOME) == 0) && /* normal case */ 12733 ((tp->t_flags & TF_NODELAY) || 12734 ((uint32_t)len + (uint32_t)sb_offset) >= sbavail(&so->so_snd)) && 12735 (tp->t_flags & TF_NOPUSH) == 0) { 12736 goto send; 12737 } 12738 if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */ 12739 goto send; 12740 } 12741 if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) { 12742 goto send; 12743 } 12744 } 12745 /* 12746 * Sending of standalone window updates. 12747 * 12748 * Window updates are important when we close our window due to a 12749 * full socket buffer and are opening it again after the application 12750 * reads data from it. Once the window has opened again and the 12751 * remote end starts to send again the ACK clock takes over and 12752 * provides the most current window information. 12753 * 12754 * We must avoid the silly window syndrome whereas every read from 12755 * the receive buffer, no matter how small, causes a window update 12756 * to be sent. We also should avoid sending a flurry of window 12757 * updates when the socket buffer had queued a lot of data and the 12758 * application is doing small reads. 12759 * 12760 * Prevent a flurry of pointless window updates by only sending an 12761 * update when we can increase the advertized window by more than 12762 * 1/4th of the socket buffer capacity. When the buffer is getting 12763 * full or is very small be more aggressive and send an update 12764 * whenever we can increase by two mss sized segments. In all other 12765 * situations the ACK's to new incoming data will carry further 12766 * window increases. 12767 * 12768 * Don't send an independent window update if a delayed ACK is 12769 * pending (it will get piggy-backed on it) or the remote side 12770 * already has done a half-close and won't send more data. Skip 12771 * this if the connection is in T/TCP half-open state. 12772 */ 12773 if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) && 12774 !(tp->t_flags & TF_DELACK) && 12775 !TCPS_HAVERCVDFIN(tp->t_state)) { 12776 /* Check to see if we should do a window update */ 12777 if (bbr_window_update_needed(tp, so, recwin, maxseg)) 12778 goto send; 12779 } 12780 /* 12781 * Send if we owe the peer an ACK, RST, SYN. ACKNOW 12782 * is also a catch-all for the retransmit timer timeout case. 12783 */ 12784 if (tp->t_flags & TF_ACKNOW) { 12785 goto send; 12786 } 12787 if (flags & TH_RST) { 12788 /* Always send a RST if one is due */ 12789 goto send; 12790 } 12791 if ((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0) { 12792 goto send; 12793 } 12794 /* 12795 * If our state indicates that FIN should be sent and we have not 12796 * yet done so, then we need to send. 12797 */ 12798 if (flags & TH_FIN && 12799 ((tp->t_flags & TF_SENTFIN) == 0)) { 12800 goto send; 12801 } 12802 /* 12803 * No reason to send a segment, just return. 12804 */ 12805 just_return: 12806 SOCKBUF_UNLOCK(sb); 12807 just_return_nolock: 12808 if (tot_len) 12809 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 12810 if (bbr->rc_no_pacing) 12811 slot = 0; 12812 if (tot_len == 0) { 12813 if ((ctf_outstanding(tp) + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) >= 12814 tp->snd_wnd) { 12815 BBR_STAT_INC(bbr_rwnd_limited); 12816 app_limited = BBR_JR_RWND_LIMITED; 12817 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12818 if ((bbr->rc_in_persist == 0) && 12819 TCPS_HAVEESTABLISHED(tp->t_state) && 12820 (tp->snd_max == tp->snd_una) && 12821 sbavail(&tp->t_inpcb->inp_socket->so_snd)) { 12822 /* No send window.. we must enter persist */ 12823 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 12824 } 12825 } else if (ctf_outstanding(tp) >= sbavail(sb)) { 12826 BBR_STAT_INC(bbr_app_limited); 12827 app_limited = BBR_JR_APP_LIMITED; 12828 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12829 } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12830 bbr->r_ctl.rc_lost_bytes)) + p_maxseg) >= tp->snd_cwnd) { 12831 BBR_STAT_INC(bbr_cwnd_limited); 12832 app_limited = BBR_JR_CWND_LIMITED; 12833 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12834 bbr->r_ctl.rc_lost_bytes))); 12835 bbr->rc_cwnd_limited = 1; 12836 } else { 12837 BBR_STAT_INC(bbr_app_limited); 12838 app_limited = BBR_JR_APP_LIMITED; 12839 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12840 } 12841 bbr->r_ctl.rc_hptsi_agg_delay = 0; 12842 bbr->r_agg_early_set = 0; 12843 bbr->r_ctl.rc_agg_early = 0; 12844 bbr->r_ctl.rc_last_delay_val = 0; 12845 } else if (bbr->rc_use_google == 0) 12846 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 12847 /* Are we app limited? */ 12848 if ((app_limited == BBR_JR_APP_LIMITED) || 12849 (app_limited == BBR_JR_RWND_LIMITED)) { 12850 /** 12851 * We are application limited. 12852 */ 12853 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12854 bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_delivered); 12855 } 12856 if (tot_len == 0) 12857 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_JUSTRET], 1); 12858 /* Dont update the time if we did not send */ 12859 bbr->r_ctl.rc_last_delay_val = 0; 12860 bbr->rc_output_starts_timer = 1; 12861 bbr_start_hpts_timer(bbr, tp, cts, 9, slot, tot_len); 12862 bbr_log_type_just_return(bbr, cts, tot_len, hpts_calling, app_limited, p_maxseg, len); 12863 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 12864 /* Make sure snd_nxt is drug up */ 12865 tp->snd_nxt = tp->snd_max; 12866 } 12867 return (error); 12868 12869 send: 12870 if (doing_tlp == 0) { 12871 /* 12872 * Data not a TLP, and its not the rxt firing. If it is the 12873 * rxt firing, we want to leave the tlp_in_progress flag on 12874 * so we don't send another TLP. It has to be a rack timer 12875 * or normal send (response to acked data) to clear the tlp 12876 * in progress flag. 12877 */ 12878 bbr->rc_tlp_in_progress = 0; 12879 bbr->rc_tlp_rtx_out = 0; 12880 } else { 12881 /* 12882 * Its a TLP. 12883 */ 12884 bbr->rc_tlp_in_progress = 1; 12885 } 12886 bbr_timer_cancel(bbr, __LINE__, cts); 12887 if (rsm == NULL) { 12888 if (sbused(sb) > 0) { 12889 /* 12890 * This is sub-optimal. We only send a stand alone 12891 * FIN on its own segment. 12892 */ 12893 if (flags & TH_FIN) { 12894 flags &= ~TH_FIN; 12895 if ((len == 0) && ((tp->t_flags & TF_ACKNOW) == 0)) { 12896 /* Lets not send this */ 12897 slot = 0; 12898 goto just_return; 12899 } 12900 } 12901 } 12902 } else { 12903 /* 12904 * We do *not* send a FIN on a retransmit if it has data. 12905 * The if clause here where len > 1 should never come true. 12906 */ 12907 if ((len > 0) && 12908 (((rsm->r_flags & BBR_HAS_FIN) == 0) && 12909 (flags & TH_FIN))) { 12910 flags &= ~TH_FIN; 12911 len--; 12912 } 12913 } 12914 SOCKBUF_LOCK_ASSERT(sb); 12915 if (len > 0) { 12916 if ((tp->snd_una == tp->snd_max) && 12917 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 12918 /* 12919 * This qualifies as a RTT_PROBE session since we 12920 * drop the data outstanding to nothing and waited 12921 * more than bbr_rtt_probe_time. 12922 */ 12923 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 12924 bbr_set_reduced_rtt(bbr, cts, __LINE__); 12925 } 12926 if (len >= maxseg) 12927 tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT; 12928 else 12929 tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT; 12930 } 12931 /* 12932 * Before ESTABLISHED, force sending of initial options unless TCP 12933 * set not to do any options. NOTE: we assume that the IP/TCP header 12934 * plus TCP options always fit in a single mbuf, leaving room for a 12935 * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr) 12936 * + optlen <= MCLBYTES 12937 */ 12938 optlen = 0; 12939 #ifdef INET6 12940 if (isipv6) 12941 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 12942 else 12943 #endif 12944 hdrlen = sizeof(struct tcpiphdr); 12945 12946 /* 12947 * Compute options for segment. We only have to care about SYN and 12948 * established connection segments. Options for SYN-ACK segments 12949 * are handled in TCP syncache. 12950 */ 12951 to.to_flags = 0; 12952 local_options = 0; 12953 if ((tp->t_flags & TF_NOOPT) == 0) { 12954 /* Maximum segment size. */ 12955 if (flags & TH_SYN) { 12956 to.to_mss = tcp_mssopt(&inp->inp_inc); 12957 if (tp->t_port) 12958 to.to_mss -= V_tcp_udp_tunneling_overhead; 12959 to.to_flags |= TOF_MSS; 12960 /* 12961 * On SYN or SYN|ACK transmits on TFO connections, 12962 * only include the TFO option if it is not a 12963 * retransmit, as the presence of the TFO option may 12964 * have caused the original SYN or SYN|ACK to have 12965 * been dropped by a middlebox. 12966 */ 12967 if (IS_FASTOPEN(tp->t_flags) && 12968 (tp->t_rxtshift == 0)) { 12969 if (tp->t_state == TCPS_SYN_RECEIVED) { 12970 to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN; 12971 to.to_tfo_cookie = 12972 (u_int8_t *)&tp->t_tfo_cookie.server; 12973 to.to_flags |= TOF_FASTOPEN; 12974 wanted_cookie = 1; 12975 } else if (tp->t_state == TCPS_SYN_SENT) { 12976 to.to_tfo_len = 12977 tp->t_tfo_client_cookie_len; 12978 to.to_tfo_cookie = 12979 tp->t_tfo_cookie.client; 12980 to.to_flags |= TOF_FASTOPEN; 12981 wanted_cookie = 1; 12982 } 12983 } 12984 } 12985 /* Window scaling. */ 12986 if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { 12987 to.to_wscale = tp->request_r_scale; 12988 to.to_flags |= TOF_SCALE; 12989 } 12990 /* Timestamps. */ 12991 if ((tp->t_flags & TF_RCVD_TSTMP) || 12992 ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { 12993 to.to_tsval = tcp_tv_to_mssectick(&bbr->rc_tv) + tp->ts_offset; 12994 to.to_tsecr = tp->ts_recent; 12995 to.to_flags |= TOF_TS; 12996 local_options += TCPOLEN_TIMESTAMP + 2; 12997 } 12998 /* Set receive buffer autosizing timestamp. */ 12999 if (tp->rfbuf_ts == 0 && 13000 (so->so_rcv.sb_flags & SB_AUTOSIZE)) 13001 tp->rfbuf_ts = tcp_tv_to_mssectick(&bbr->rc_tv); 13002 /* Selective ACK's. */ 13003 if (flags & TH_SYN) 13004 to.to_flags |= TOF_SACKPERM; 13005 else if (TCPS_HAVEESTABLISHED(tp->t_state) && 13006 tp->rcv_numsacks > 0) { 13007 to.to_flags |= TOF_SACK; 13008 to.to_nsacks = tp->rcv_numsacks; 13009 to.to_sacks = (u_char *)tp->sackblks; 13010 } 13011 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13012 /* TCP-MD5 (RFC2385). */ 13013 if (tp->t_flags & TF_SIGNATURE) 13014 to.to_flags |= TOF_SIGNATURE; 13015 #endif /* TCP_SIGNATURE */ 13016 13017 /* Processing the options. */ 13018 hdrlen += (optlen = tcp_addoptions(&to, opt)); 13019 /* 13020 * If we wanted a TFO option to be added, but it was unable 13021 * to fit, ensure no data is sent. 13022 */ 13023 if (IS_FASTOPEN(tp->t_flags) && wanted_cookie && 13024 !(to.to_flags & TOF_FASTOPEN)) 13025 len = 0; 13026 } 13027 if (tp->t_port) { 13028 if (V_tcp_udp_tunneling_port == 0) { 13029 /* The port was removed?? */ 13030 SOCKBUF_UNLOCK(&so->so_snd); 13031 return (EHOSTUNREACH); 13032 } 13033 hdrlen += sizeof(struct udphdr); 13034 } 13035 #ifdef INET6 13036 if (isipv6) 13037 ipoptlen = ip6_optlen(tp->t_inpcb); 13038 else 13039 #endif 13040 if (tp->t_inpcb->inp_options) 13041 ipoptlen = tp->t_inpcb->inp_options->m_len - 13042 offsetof(struct ipoption, ipopt_list); 13043 else 13044 ipoptlen = 0; 13045 ipoptlen = 0; 13046 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 13047 ipoptlen += ipsec_optlen; 13048 #endif 13049 if (bbr->rc_last_options != local_options) { 13050 /* 13051 * Cache the options length this generally does not change 13052 * on a connection. We use this to calculate TSO. 13053 */ 13054 bbr->rc_last_options = local_options; 13055 } 13056 maxseg = tp->t_maxseg - (ipoptlen + optlen); 13057 p_maxseg = min(maxseg, pace_max_segs); 13058 /* 13059 * Adjust data length if insertion of options will bump the packet 13060 * length beyond the t_maxseg length. Clear the FIN bit because we 13061 * cut off the tail of the segment. 13062 */ 13063 if (len > maxseg) { 13064 if (len != 0 && (flags & TH_FIN)) { 13065 flags &= ~TH_FIN; 13066 } 13067 if (tso) { 13068 uint32_t moff; 13069 int32_t max_len; 13070 13071 /* extract TSO information */ 13072 if_hw_tsomax = tp->t_tsomax; 13073 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount; 13074 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize; 13075 KASSERT(ipoptlen == 0, 13076 ("%s: TSO can't do IP options", __func__)); 13077 13078 /* 13079 * Check if we should limit by maximum payload 13080 * length: 13081 */ 13082 if (if_hw_tsomax != 0) { 13083 /* compute maximum TSO length */ 13084 max_len = (if_hw_tsomax - hdrlen - 13085 max_linkhdr); 13086 if (max_len <= 0) { 13087 len = 0; 13088 } else if (len > max_len) { 13089 len = max_len; 13090 } 13091 } 13092 /* 13093 * Prevent the last segment from being fractional 13094 * unless the send sockbuf can be emptied: 13095 */ 13096 if ((sb_offset + len) < sbavail(sb)) { 13097 moff = len % (uint32_t)maxseg; 13098 if (moff != 0) { 13099 len -= moff; 13100 } 13101 } 13102 /* 13103 * In case there are too many small fragments don't 13104 * use TSO: 13105 */ 13106 if (len <= maxseg) { 13107 len = maxseg; 13108 tso = 0; 13109 } 13110 } else { 13111 /* Not doing TSO */ 13112 if (optlen + ipoptlen >= tp->t_maxseg) { 13113 /* 13114 * Since we don't have enough space to put 13115 * the IP header chain and the TCP header in 13116 * one packet as required by RFC 7112, don't 13117 * send it. Also ensure that at least one 13118 * byte of the payload can be put into the 13119 * TCP segment. 13120 */ 13121 SOCKBUF_UNLOCK(&so->so_snd); 13122 error = EMSGSIZE; 13123 sack_rxmit = 0; 13124 goto out; 13125 } 13126 len = maxseg; 13127 } 13128 } else { 13129 /* Not doing TSO */ 13130 if_hw_tsomaxsegcount = 0; 13131 tso = 0; 13132 } 13133 KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET, 13134 ("%s: len > IP_MAXPACKET", __func__)); 13135 #ifdef DIAGNOSTIC 13136 #ifdef INET6 13137 if (max_linkhdr + hdrlen > MCLBYTES) 13138 #else 13139 if (max_linkhdr + hdrlen > MHLEN) 13140 #endif 13141 panic("tcphdr too big"); 13142 #endif 13143 /* 13144 * This KASSERT is here to catch edge cases at a well defined place. 13145 * Before, those had triggered (random) panic conditions further 13146 * down. 13147 */ 13148 #ifdef BBR_INVARIANTS 13149 if (sack_rxmit) { 13150 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 13151 panic("RSM:%p TP:%p bbr:%p start:%u is < snd_una:%u", 13152 rsm, tp, bbr, rsm->r_start, tp->snd_una); 13153 } 13154 } 13155 #endif 13156 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 13157 if ((len == 0) && 13158 (flags & TH_FIN) && 13159 (sbused(sb))) { 13160 /* 13161 * We have outstanding data, don't send a fin by itself!. 13162 */ 13163 slot = 0; 13164 goto just_return; 13165 } 13166 /* 13167 * Grab a header mbuf, attaching a copy of data to be transmitted, 13168 * and initialize the header from the template for sends on this 13169 * connection. 13170 */ 13171 if (len) { 13172 uint32_t moff; 13173 uint32_t orig_len; 13174 13175 /* 13176 * We place a limit on sending with hptsi. 13177 */ 13178 if ((rsm == NULL) && len > pace_max_segs) 13179 len = pace_max_segs; 13180 if (len <= maxseg) 13181 tso = 0; 13182 #ifdef INET6 13183 if (MHLEN < hdrlen + max_linkhdr) 13184 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 13185 else 13186 #endif 13187 m = m_gethdr(M_NOWAIT, MT_DATA); 13188 13189 if (m == NULL) { 13190 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13191 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13192 SOCKBUF_UNLOCK(sb); 13193 error = ENOBUFS; 13194 sack_rxmit = 0; 13195 goto out; 13196 } 13197 m->m_data += max_linkhdr; 13198 m->m_len = hdrlen; 13199 /* 13200 * Start the m_copy functions from the closest mbuf to the 13201 * sb_offset in the socket buffer chain. 13202 */ 13203 if ((sb_offset > sbavail(sb)) || ((len + sb_offset) > sbavail(sb))) { 13204 #ifdef BBR_INVARIANTS 13205 if ((len + sb_offset) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) 13206 panic("tp:%p bbr:%p len:%u sb_offset:%u sbavail:%u rsm:%p %u:%u:%u", 13207 tp, bbr, len, sb_offset, sbavail(sb), rsm, 13208 doing_retran_from, 13209 picked_up_retran, 13210 doing_tlp); 13211 13212 #endif 13213 /* 13214 * In this messed up situation we have two choices, 13215 * a) pretend the send worked, and just start timers 13216 * and what not (not good since that may lead us 13217 * back here a lot). <or> b) Send the lowest segment 13218 * in the map. <or> c) Drop the connection. Lets do 13219 * <b> which if it continues to happen will lead to 13220 * <c> via timeouts. 13221 */ 13222 BBR_STAT_INC(bbr_offset_recovery); 13223 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 13224 sb_offset = 0; 13225 if (rsm == NULL) { 13226 sack_rxmit = 0; 13227 len = sbavail(sb); 13228 } else { 13229 sack_rxmit = 1; 13230 if (rsm->r_start != tp->snd_una) { 13231 /* 13232 * Things are really messed up, <c> 13233 * is the only thing to do. 13234 */ 13235 BBR_STAT_INC(bbr_offset_drop); 13236 tcp_set_inp_to_drop(inp, EFAULT); 13237 SOCKBUF_UNLOCK(sb); 13238 (void)m_free(m); 13239 return (0); 13240 } 13241 len = rsm->r_end - rsm->r_start; 13242 } 13243 if (len > sbavail(sb)) 13244 len = sbavail(sb); 13245 if (len > maxseg) 13246 len = maxseg; 13247 } 13248 mb = sbsndptr_noadv(sb, sb_offset, &moff); 13249 if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) { 13250 m_copydata(mb, moff, (int)len, 13251 mtod(m, caddr_t)+hdrlen); 13252 if (rsm == NULL) 13253 sbsndptr_adv(sb, mb, len); 13254 m->m_len += len; 13255 } else { 13256 struct sockbuf *msb; 13257 13258 if (rsm) 13259 msb = NULL; 13260 else 13261 msb = sb; 13262 #ifdef BBR_INVARIANTS 13263 if ((len + moff) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) { 13264 if (rsm) { 13265 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 ", 13266 tp, bbr, len, moff, 13267 sbavail(sb), rsm, 13268 tp->snd_una, rsm->r_flags, rsm->r_start, 13269 doing_retran_from, 13270 picked_up_retran, 13271 doing_tlp, sack_rxmit); 13272 } else { 13273 panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u sb_offset:%u snd_una:%u", 13274 tp, bbr, len, moff, sbavail(sb), sb_offset, tp->snd_una); 13275 } 13276 } 13277 #endif 13278 orig_len = len; 13279 m->m_next = tcp_m_copym( 13280 mb, moff, &len, 13281 if_hw_tsomaxsegcount, 13282 if_hw_tsomaxsegsize, msb, 13283 ((rsm == NULL) ? hw_tls : 0) 13284 #ifdef NETFLIX_COPY_ARGS 13285 , &filled_all 13286 #endif 13287 ); 13288 if (len <= maxseg) { 13289 /* 13290 * Must have ran out of mbufs for the copy 13291 * shorten it to no longer need tso. Lets 13292 * not put on sendalot since we are low on 13293 * mbufs. 13294 */ 13295 tso = 0; 13296 } 13297 if (m->m_next == NULL) { 13298 SOCKBUF_UNLOCK(sb); 13299 (void)m_free(m); 13300 error = ENOBUFS; 13301 sack_rxmit = 0; 13302 goto out; 13303 } 13304 } 13305 #ifdef BBR_INVARIANTS 13306 if (tso && len < maxseg) { 13307 panic("tp:%p tso on, but len:%d < maxseg:%d", 13308 tp, len, maxseg); 13309 } 13310 if (tso && if_hw_tsomaxsegcount) { 13311 int32_t seg_cnt = 0; 13312 struct mbuf *foo; 13313 13314 foo = m; 13315 while (foo) { 13316 seg_cnt++; 13317 foo = foo->m_next; 13318 } 13319 if (seg_cnt > if_hw_tsomaxsegcount) { 13320 panic("seg_cnt:%d > max:%d", seg_cnt, if_hw_tsomaxsegcount); 13321 } 13322 } 13323 #endif 13324 /* 13325 * If we're sending everything we've got, set PUSH. (This 13326 * will keep happy those implementations which only give 13327 * data to the user when a buffer fills or a PUSH comes in.) 13328 */ 13329 if (sb_offset + len == sbused(sb) && 13330 sbused(sb) && 13331 !(flags & TH_SYN)) { 13332 flags |= TH_PUSH; 13333 } 13334 SOCKBUF_UNLOCK(sb); 13335 } else { 13336 SOCKBUF_UNLOCK(sb); 13337 if (tp->t_flags & TF_ACKNOW) 13338 KMOD_TCPSTAT_INC(tcps_sndacks); 13339 else if (flags & (TH_SYN | TH_FIN | TH_RST)) 13340 KMOD_TCPSTAT_INC(tcps_sndctrl); 13341 else 13342 KMOD_TCPSTAT_INC(tcps_sndwinup); 13343 13344 m = m_gethdr(M_NOWAIT, MT_DATA); 13345 if (m == NULL) { 13346 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13347 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13348 error = ENOBUFS; 13349 /* Fudge the send time since we could not send */ 13350 sack_rxmit = 0; 13351 goto out; 13352 } 13353 #ifdef INET6 13354 if (isipv6 && (MHLEN < hdrlen + max_linkhdr) && 13355 MHLEN >= hdrlen) { 13356 M_ALIGN(m, hdrlen); 13357 } else 13358 #endif 13359 m->m_data += max_linkhdr; 13360 m->m_len = hdrlen; 13361 } 13362 SOCKBUF_UNLOCK_ASSERT(sb); 13363 m->m_pkthdr.rcvif = (struct ifnet *)0; 13364 #ifdef MAC 13365 mac_inpcb_create_mbuf(inp, m); 13366 #endif 13367 #ifdef INET6 13368 if (isipv6) { 13369 ip6 = mtod(m, struct ip6_hdr *); 13370 if (tp->t_port) { 13371 udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr)); 13372 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13373 udp->uh_dport = tp->t_port; 13374 ulen = hdrlen + len - sizeof(struct ip6_hdr); 13375 udp->uh_ulen = htons(ulen); 13376 th = (struct tcphdr *)(udp + 1); 13377 } else { 13378 th = (struct tcphdr *)(ip6 + 1); 13379 } 13380 tcpip_fillheaders(inp, tp->t_port, ip6, th); 13381 } else 13382 #endif /* INET6 */ 13383 { 13384 ip = mtod(m, struct ip *); 13385 #ifdef TCPDEBUG 13386 ipov = (struct ipovly *)ip; 13387 #endif 13388 if (tp->t_port) { 13389 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip)); 13390 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13391 udp->uh_dport = tp->t_port; 13392 ulen = hdrlen + len - sizeof(struct ip); 13393 udp->uh_ulen = htons(ulen); 13394 th = (struct tcphdr *)(udp + 1); 13395 } else { 13396 th = (struct tcphdr *)(ip + 1); 13397 } 13398 tcpip_fillheaders(inp, tp->t_port, ip, th); 13399 } 13400 /* 13401 * If we are doing retransmissions, then snd_nxt will not reflect 13402 * the first unsent octet. For ACK only packets, we do not want the 13403 * sequence number of the retransmitted packet, we want the sequence 13404 * number of the next unsent octet. So, if there is no data (and no 13405 * SYN or FIN), use snd_max instead of snd_nxt when filling in 13406 * ti_seq. But if we are in persist state, snd_max might reflect 13407 * one byte beyond the right edge of the window, so use snd_nxt in 13408 * that case, since we know we aren't doing a retransmission. 13409 * (retransmit and persist are mutually exclusive...) 13410 */ 13411 if (sack_rxmit == 0) { 13412 if (len && ((flags & (TH_FIN | TH_SYN | TH_RST)) == 0)) { 13413 /* New data (including new persists) */ 13414 th->th_seq = htonl(tp->snd_max); 13415 bbr_seq = tp->snd_max; 13416 } else if (flags & TH_SYN) { 13417 /* Syn's always send from iss */ 13418 th->th_seq = htonl(tp->iss); 13419 bbr_seq = tp->iss; 13420 } else if (flags & TH_FIN) { 13421 if (flags & TH_FIN && tp->t_flags & TF_SENTFIN) { 13422 /* 13423 * If we sent the fin already its 1 minus 13424 * snd_max 13425 */ 13426 th->th_seq = (htonl(tp->snd_max - 1)); 13427 bbr_seq = (tp->snd_max - 1); 13428 } else { 13429 /* First time FIN use snd_max */ 13430 th->th_seq = htonl(tp->snd_max); 13431 bbr_seq = tp->snd_max; 13432 } 13433 } else { 13434 /* 13435 * len == 0 and not persist we use snd_max, sending 13436 * an ack unless we have sent the fin then its 1 13437 * minus. 13438 */ 13439 /* 13440 * XXXRRS Question if we are in persists and we have 13441 * nothing outstanding to send and we have not sent 13442 * a FIN, we will send an ACK. In such a case it 13443 * might be better to send (tp->snd_una - 1) which 13444 * would force the peer to ack. 13445 */ 13446 if (tp->t_flags & TF_SENTFIN) { 13447 th->th_seq = htonl(tp->snd_max - 1); 13448 bbr_seq = (tp->snd_max - 1); 13449 } else { 13450 th->th_seq = htonl(tp->snd_max); 13451 bbr_seq = tp->snd_max; 13452 } 13453 } 13454 } else { 13455 /* All retransmits use the rsm to guide the send */ 13456 th->th_seq = htonl(rsm->r_start); 13457 bbr_seq = rsm->r_start; 13458 } 13459 th->th_ack = htonl(tp->rcv_nxt); 13460 if (optlen) { 13461 bcopy(opt, th + 1, optlen); 13462 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2; 13463 } 13464 th->th_flags = flags; 13465 /* 13466 * Calculate receive window. Don't shrink window, but avoid silly 13467 * window syndrome. 13468 */ 13469 if ((flags & TH_RST) || ((recwin < (so->so_rcv.sb_hiwat / 4) && 13470 recwin < maxseg))) 13471 recwin = 0; 13472 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && 13473 recwin < (tp->rcv_adv - tp->rcv_nxt)) 13474 recwin = (tp->rcv_adv - tp->rcv_nxt); 13475 if (recwin > TCP_MAXWIN << tp->rcv_scale) 13476 recwin = TCP_MAXWIN << tp->rcv_scale; 13477 13478 /* 13479 * According to RFC1323 the window field in a SYN (i.e., a <SYN> or 13480 * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is 13481 * handled in syncache. 13482 */ 13483 if (flags & TH_SYN) 13484 th->th_win = htons((u_short) 13485 (min(sbspace(&so->so_rcv), TCP_MAXWIN))); 13486 else { 13487 /* Avoid shrinking window with window scaling. */ 13488 recwin = roundup2(recwin, 1 << tp->rcv_scale); 13489 th->th_win = htons((u_short)(recwin >> tp->rcv_scale)); 13490 } 13491 /* 13492 * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0 13493 * window. This may cause the remote transmitter to stall. This 13494 * flag tells soreceive() to disable delayed acknowledgements when 13495 * draining the buffer. This can occur if the receiver is 13496 * attempting to read more data than can be buffered prior to 13497 * transmitting on the connection. 13498 */ 13499 if (th->th_win == 0) { 13500 tp->t_sndzerowin++; 13501 tp->t_flags |= TF_RXWIN0SENT; 13502 } else 13503 tp->t_flags &= ~TF_RXWIN0SENT; 13504 /* 13505 * We don't support urgent data, but drag along 13506 * the pointer in case of a stack switch. 13507 */ 13508 tp->snd_up = tp->snd_una; 13509 13510 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13511 if (to.to_flags & TOF_SIGNATURE) { 13512 /* 13513 * Calculate MD5 signature and put it into the place 13514 * determined before. NOTE: since TCP options buffer doesn't 13515 * point into mbuf's data, calculate offset and use it. 13516 */ 13517 if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th, 13518 (u_char *)(th + 1) + (to.to_signature - opt)) != 0) { 13519 /* 13520 * Do not send segment if the calculation of MD5 13521 * digest has failed. 13522 */ 13523 goto out; 13524 } 13525 } 13526 #endif 13527 13528 /* 13529 * Put TCP length in extended header, and then checksum extended 13530 * header and data. 13531 */ 13532 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */ 13533 #ifdef INET6 13534 if (isipv6) { 13535 /* 13536 * ip6_plen is not need to be filled now, and will be filled 13537 * in ip6_output. 13538 */ 13539 if (tp->t_port) { 13540 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 13541 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13542 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0); 13543 th->th_sum = htons(0); 13544 UDPSTAT_INC(udps_opackets); 13545 } else { 13546 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; 13547 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13548 th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) + 13549 optlen + len, IPPROTO_TCP, 0); 13550 } 13551 } 13552 #endif 13553 #if defined(INET6) && defined(INET) 13554 else 13555 #endif 13556 #ifdef INET 13557 { 13558 if (tp->t_port) { 13559 m->m_pkthdr.csum_flags = CSUM_UDP; 13560 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13561 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, 13562 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP)); 13563 th->th_sum = htons(0); 13564 UDPSTAT_INC(udps_opackets); 13565 } else { 13566 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP; 13567 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13568 th->th_sum = in_pseudo(ip->ip_src.s_addr, 13569 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) + 13570 IPPROTO_TCP + len + optlen)); 13571 } 13572 /* IP version must be set here for ipv4/ipv6 checking later */ 13573 KASSERT(ip->ip_v == IPVERSION, 13574 ("%s: IP version incorrect: %d", __func__, ip->ip_v)); 13575 } 13576 #endif 13577 13578 /* 13579 * Enable TSO and specify the size of the segments. The TCP pseudo 13580 * header checksum is always provided. XXX: Fixme: This is currently 13581 * not the case for IPv6. 13582 */ 13583 if (tso) { 13584 KASSERT(len > maxseg, 13585 ("%s: len:%d <= tso_segsz:%d", __func__, len, maxseg)); 13586 m->m_pkthdr.csum_flags |= CSUM_TSO; 13587 csum_flags |= CSUM_TSO; 13588 m->m_pkthdr.tso_segsz = maxseg; 13589 } 13590 KASSERT(len + hdrlen == m_length(m, NULL), 13591 ("%s: mbuf chain different than expected: %d + %u != %u", 13592 __func__, len, hdrlen, m_length(m, NULL))); 13593 13594 #ifdef TCP_HHOOK 13595 /* Run HHOOK_TC_ESTABLISHED_OUT helper hooks. */ 13596 hhook_run_tcp_est_out(tp, th, &to, len, tso); 13597 #endif 13598 #ifdef TCPDEBUG 13599 /* 13600 * Trace. 13601 */ 13602 if (so->so_options & SO_DEBUG) { 13603 u_short save = 0; 13604 13605 #ifdef INET6 13606 if (!isipv6) 13607 #endif 13608 { 13609 save = ipov->ih_len; 13610 ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen + 13611 * (th->th_off << 2) */ ); 13612 } 13613 tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0); 13614 #ifdef INET6 13615 if (!isipv6) 13616 #endif 13617 ipov->ih_len = save; 13618 } 13619 #endif /* TCPDEBUG */ 13620 13621 /* Log to the black box */ 13622 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 13623 union tcp_log_stackspecific log; 13624 13625 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 13626 /* Record info on type of transmission */ 13627 log.u_bbr.flex1 = bbr->r_ctl.rc_hptsi_agg_delay; 13628 log.u_bbr.flex2 = (bbr->r_recovery_bw << 3); 13629 log.u_bbr.flex3 = maxseg; 13630 log.u_bbr.flex4 = delay_calc; 13631 /* Encode filled_all into the upper flex5 bit */ 13632 log.u_bbr.flex5 = bbr->rc_past_init_win; 13633 log.u_bbr.flex5 <<= 1; 13634 log.u_bbr.flex5 |= bbr->rc_no_pacing; 13635 log.u_bbr.flex5 <<= 29; 13636 if (filled_all) 13637 log.u_bbr.flex5 |= 0x80000000; 13638 log.u_bbr.flex5 |= tp->t_maxseg; 13639 log.u_bbr.flex6 = bbr->r_ctl.rc_pace_max_segs; 13640 log.u_bbr.flex7 = (bbr->rc_bbr_state << 8) | bbr_state_val(bbr); 13641 /* lets poke in the low and the high here for debugging */ 13642 log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; 13643 if (rsm || sack_rxmit) { 13644 if (doing_tlp) 13645 log.u_bbr.flex8 = 2; 13646 else 13647 log.u_bbr.flex8 = 1; 13648 } else { 13649 log.u_bbr.flex8 = 0; 13650 } 13651 lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK, 13652 len, &log, false, NULL, NULL, 0, tv); 13653 } else { 13654 lgb = NULL; 13655 } 13656 /* 13657 * Fill in IP length and desired time to live and send to IP level. 13658 * There should be a better way to handle ttl and tos; we could keep 13659 * them in the template, but need a way to checksum without them. 13660 */ 13661 /* 13662 * m->m_pkthdr.len should have been set before cksum calcuration, 13663 * because in6_cksum() need it. 13664 */ 13665 #ifdef INET6 13666 if (isipv6) { 13667 /* 13668 * we separately set hoplimit for every segment, since the 13669 * user might want to change the value via setsockopt. Also, 13670 * desired default hop limit might be changed via Neighbor 13671 * Discovery. 13672 */ 13673 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 13674 13675 /* 13676 * Set the packet size here for the benefit of DTrace 13677 * probes. ip6_output() will set it properly; it's supposed 13678 * to include the option header lengths as well. 13679 */ 13680 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 13681 13682 if (V_path_mtu_discovery && maxseg > V_tcp_minmss) 13683 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13684 else 13685 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 13686 13687 if (tp->t_state == TCPS_SYN_SENT) 13688 TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th); 13689 13690 TCP_PROBE5(send, NULL, tp, ip6, tp, th); 13691 /* TODO: IPv6 IP6TOS_ECT bit on */ 13692 error = ip6_output(m, inp->in6p_outputopts, 13693 &inp->inp_route6, 13694 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 13695 NULL, NULL, inp); 13696 13697 if (error == EMSGSIZE && inp->inp_route6.ro_nh != NULL) 13698 mtu = inp->inp_route6.ro_nh->nh_mtu; 13699 } 13700 #endif /* INET6 */ 13701 #if defined(INET) && defined(INET6) 13702 else 13703 #endif 13704 #ifdef INET 13705 { 13706 ip->ip_len = htons(m->m_pkthdr.len); 13707 #ifdef INET6 13708 if (isipv6) 13709 ip->ip_ttl = in6_selecthlim(inp, NULL); 13710 #endif /* INET6 */ 13711 /* 13712 * If we do path MTU discovery, then we set DF on every 13713 * packet. This might not be the best thing to do according 13714 * to RFC3390 Section 2. However the tcp hostcache migitates 13715 * the problem so it affects only the first tcp connection 13716 * with a host. 13717 * 13718 * NB: Don't set DF on small MTU/MSS to have a safe 13719 * fallback. 13720 */ 13721 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) { 13722 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13723 if (tp->t_port == 0 || len < V_tcp_minmss) { 13724 ip->ip_off |= htons(IP_DF); 13725 } 13726 } else { 13727 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 13728 } 13729 13730 if (tp->t_state == TCPS_SYN_SENT) 13731 TCP_PROBE5(connect__request, NULL, tp, ip, tp, th); 13732 13733 TCP_PROBE5(send, NULL, tp, ip, tp, th); 13734 13735 error = ip_output(m, inp->inp_options, &inp->inp_route, 13736 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0, 13737 inp); 13738 if (error == EMSGSIZE && inp->inp_route.ro_nh != NULL) 13739 mtu = inp->inp_route.ro_nh->nh_mtu; 13740 } 13741 #endif /* INET */ 13742 out: 13743 13744 if (lgb) { 13745 lgb->tlb_errno = error; 13746 lgb = NULL; 13747 } 13748 /* 13749 * In transmit state, time the transmission and arrange for the 13750 * retransmit. In persist state, just set snd_max. 13751 */ 13752 if (error == 0) { 13753 tcp_account_for_send(tp, len, (rsm != NULL), doing_tlp); 13754 if (TCPS_HAVEESTABLISHED(tp->t_state) && 13755 (tp->t_flags & TF_SACK_PERMIT) && 13756 tp->rcv_numsacks > 0) 13757 tcp_clean_dsack_blocks(tp); 13758 /* We sent an ack clear the bbr_segs_rcvd count */ 13759 bbr->output_error_seen = 0; 13760 bbr->oerror_cnt = 0; 13761 bbr->bbr_segs_rcvd = 0; 13762 if (len == 0) 13763 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_SNDACK], 1); 13764 /* Do accounting for new sends */ 13765 if ((len > 0) && (rsm == NULL)) { 13766 int idx; 13767 if (tp->snd_una == tp->snd_max) { 13768 /* 13769 * Special case to match google, when 13770 * nothing is in flight the delivered 13771 * time does get updated to the current 13772 * time (see tcp_rate_bsd.c). 13773 */ 13774 bbr->r_ctl.rc_del_time = cts; 13775 } 13776 if (len >= maxseg) { 13777 idx = (len / maxseg) + 3; 13778 if (idx >= TCP_MSS_ACCT_ATIMER) 13779 counter_u64_add(bbr_out_size[(TCP_MSS_ACCT_ATIMER - 1)], 1); 13780 else 13781 counter_u64_add(bbr_out_size[idx], 1); 13782 } else { 13783 /* smaller than a MSS */ 13784 idx = len / (bbr_hptsi_bytes_min - bbr->rc_last_options); 13785 if (idx >= TCP_MSS_SMALL_MAX_SIZE_DIV) 13786 idx = (TCP_MSS_SMALL_MAX_SIZE_DIV - 1); 13787 counter_u64_add(bbr_out_size[(idx + TCP_MSS_SMALL_SIZE_OFF)], 1); 13788 } 13789 } 13790 } 13791 abandon = 0; 13792 /* 13793 * We must do the send accounting before we log the output, 13794 * otherwise the state of the rsm could change and we account to the 13795 * wrong bucket. 13796 */ 13797 if (len > 0) { 13798 bbr_do_send_accounting(tp, bbr, rsm, len, error); 13799 if (error == 0) { 13800 if (tp->snd_una == tp->snd_max) 13801 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 13802 } 13803 } 13804 bbr_log_output(bbr, tp, &to, len, bbr_seq, (uint8_t) flags, error, 13805 cts, mb, &abandon, rsm, 0, sb); 13806 if (abandon) { 13807 /* 13808 * If bbr_log_output destroys the TCB or sees a TH_RST being 13809 * sent we should hit this condition. 13810 */ 13811 return (0); 13812 } 13813 if (bbr->rc_in_persist == 0) { 13814 /* 13815 * Advance snd_nxt over sequence space of this segment. 13816 */ 13817 if (error) 13818 /* We don't log or do anything with errors */ 13819 goto skip_upd; 13820 13821 if (tp->snd_una == tp->snd_max && 13822 (len || (flags & (TH_SYN | TH_FIN)))) { 13823 /* 13824 * Update the time we just added data since none was 13825 * outstanding. 13826 */ 13827 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 13828 bbr->rc_tp->t_acktime = ticks; 13829 } 13830 if (flags & (TH_SYN | TH_FIN) && (rsm == NULL)) { 13831 if (flags & TH_SYN) { 13832 /* 13833 * Smack the snd_max to iss + 1 13834 * if its a FO we will add len below. 13835 */ 13836 tp->snd_max = tp->iss + 1; 13837 } 13838 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 13839 tp->snd_max++; 13840 tp->t_flags |= TF_SENTFIN; 13841 } 13842 } 13843 if (sack_rxmit == 0) 13844 tp->snd_max += len; 13845 skip_upd: 13846 if ((error == 0) && len) 13847 tot_len += len; 13848 } else { 13849 /* Persists case */ 13850 int32_t xlen = len; 13851 13852 if (error) 13853 goto nomore; 13854 13855 if (flags & TH_SYN) 13856 ++xlen; 13857 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 13858 ++xlen; 13859 tp->t_flags |= TF_SENTFIN; 13860 } 13861 if (xlen && (tp->snd_una == tp->snd_max)) { 13862 /* 13863 * Update the time we just added data since none was 13864 * outstanding. 13865 */ 13866 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 13867 bbr->rc_tp->t_acktime = ticks; 13868 } 13869 if (sack_rxmit == 0) 13870 tp->snd_max += xlen; 13871 tot_len += (len + optlen + ipoptlen); 13872 } 13873 nomore: 13874 if (error) { 13875 /* 13876 * Failures do not advance the seq counter above. For the 13877 * case of ENOBUFS we will fall out and become ack-clocked. 13878 * capping the cwnd at the current flight. 13879 * Everything else will just have to retransmit with the timer 13880 * (no pacer). 13881 */ 13882 SOCKBUF_UNLOCK_ASSERT(sb); 13883 BBR_STAT_INC(bbr_saw_oerr); 13884 /* Clear all delay/early tracks */ 13885 bbr->r_ctl.rc_hptsi_agg_delay = 0; 13886 bbr->r_ctl.rc_agg_early = 0; 13887 bbr->r_agg_early_set = 0; 13888 bbr->output_error_seen = 1; 13889 if (bbr->oerror_cnt < 0xf) 13890 bbr->oerror_cnt++; 13891 if (bbr_max_net_error_cnt && (bbr->oerror_cnt >= bbr_max_net_error_cnt)) { 13892 /* drop the session */ 13893 tcp_set_inp_to_drop(inp, ENETDOWN); 13894 } 13895 switch (error) { 13896 case ENOBUFS: 13897 /* 13898 * Make this guy have to get ack's to send 13899 * more but lets make sure we don't 13900 * slam him below a T-O (1MSS). 13901 */ 13902 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 13903 tp->snd_cwnd = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 13904 bbr->r_ctl.rc_lost_bytes)) - maxseg; 13905 if (tp->snd_cwnd < maxseg) 13906 tp->snd_cwnd = maxseg; 13907 } 13908 slot = (bbr_error_base_paceout + 1) << bbr->oerror_cnt; 13909 BBR_STAT_INC(bbr_saw_enobuf); 13910 if (bbr->bbr_hdrw_pacing) 13911 counter_u64_add(bbr_hdwr_pacing_enobuf, 1); 13912 else 13913 counter_u64_add(bbr_nohdwr_pacing_enobuf, 1); 13914 /* 13915 * Here even in the enobuf's case we want to do our 13916 * state update. The reason being we may have been 13917 * called by the input function. If so we have had 13918 * things change. 13919 */ 13920 error = 0; 13921 goto enobufs; 13922 case EMSGSIZE: 13923 /* 13924 * For some reason the interface we used initially 13925 * to send segments changed to another or lowered 13926 * its MTU. If TSO was active we either got an 13927 * interface without TSO capabilits or TSO was 13928 * turned off. If we obtained mtu from ip_output() 13929 * then update it and try again. 13930 */ 13931 /* Turn on tracing (or try to) */ 13932 { 13933 int old_maxseg; 13934 13935 old_maxseg = tp->t_maxseg; 13936 BBR_STAT_INC(bbr_saw_emsgsiz); 13937 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, csum_flags, tso, cts); 13938 if (mtu != 0) 13939 tcp_mss_update(tp, -1, mtu, NULL, NULL); 13940 if (old_maxseg <= tp->t_maxseg) { 13941 /* Huh it did not shrink? */ 13942 tp->t_maxseg = old_maxseg - 40; 13943 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, 0, tso, cts); 13944 } 13945 /* 13946 * Nuke all other things that can interfere 13947 * with slot 13948 */ 13949 if ((tot_len + len) && (len >= tp->t_maxseg)) { 13950 slot = bbr_get_pacing_delay(bbr, 13951 bbr->r_ctl.rc_bbr_hptsi_gain, 13952 (tot_len + len), cts, 0); 13953 if (slot < bbr_error_base_paceout) 13954 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 13955 } else 13956 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 13957 bbr->rc_output_starts_timer = 1; 13958 bbr_start_hpts_timer(bbr, tp, cts, 10, slot, 13959 tot_len); 13960 return (error); 13961 } 13962 case EPERM: 13963 tp->t_softerror = error; 13964 /* Fall through */ 13965 case EHOSTDOWN: 13966 case EHOSTUNREACH: 13967 case ENETDOWN: 13968 case ENETUNREACH: 13969 if (TCPS_HAVERCVDSYN(tp->t_state)) { 13970 tp->t_softerror = error; 13971 } 13972 /* FALLTHROUGH */ 13973 default: 13974 slot = (bbr_error_base_paceout + 3) << bbr->oerror_cnt; 13975 bbr->rc_output_starts_timer = 1; 13976 bbr_start_hpts_timer(bbr, tp, cts, 11, slot, 0); 13977 return (error); 13978 } 13979 #ifdef STATS 13980 } else if (((tp->t_flags & TF_GPUTINPROG) == 0) && 13981 len && 13982 (rsm == NULL) && 13983 (bbr->rc_in_persist == 0)) { 13984 tp->gput_seq = bbr_seq; 13985 tp->gput_ack = bbr_seq + 13986 min(sbavail(&so->so_snd) - sb_offset, sendwin); 13987 tp->gput_ts = cts; 13988 tp->t_flags |= TF_GPUTINPROG; 13989 #endif 13990 } 13991 KMOD_TCPSTAT_INC(tcps_sndtotal); 13992 if ((bbr->bbr_hdw_pace_ena) && 13993 (bbr->bbr_attempt_hdwr_pace == 0) && 13994 (bbr->rc_past_init_win) && 13995 (bbr->rc_bbr_state != BBR_STATE_STARTUP) && 13996 (get_filter_value(&bbr->r_ctl.rc_delrate)) && 13997 (inp->inp_route.ro_nh && 13998 inp->inp_route.ro_nh->nh_ifp)) { 13999 /* 14000 * We are past the initial window and 14001 * have at least one measurement so we 14002 * could use hardware pacing if its available. 14003 * We have an interface and we have not attempted 14004 * to setup hardware pacing, lets try to now. 14005 */ 14006 uint64_t rate_wanted; 14007 int err = 0; 14008 14009 rate_wanted = bbr_get_hardware_rate(bbr); 14010 bbr->bbr_attempt_hdwr_pace = 1; 14011 bbr->r_ctl.crte = tcp_set_pacing_rate(bbr->rc_tp, 14012 inp->inp_route.ro_nh->nh_ifp, 14013 rate_wanted, 14014 (RS_PACING_GEQ|RS_PACING_SUB_OK), 14015 &err, NULL); 14016 if (bbr->r_ctl.crte) { 14017 bbr_type_log_hdwr_pacing(bbr, 14018 bbr->r_ctl.crte->ptbl->rs_ifp, 14019 rate_wanted, 14020 bbr->r_ctl.crte->rate, 14021 __LINE__, cts, err); 14022 BBR_STAT_INC(bbr_hdwr_rl_add_ok); 14023 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 14024 counter_u64_add(bbr_flows_whdwr_pacing, 1); 14025 bbr->bbr_hdrw_pacing = 1; 14026 /* Now what is our gain status? */ 14027 if (bbr->r_ctl.crte->rate < rate_wanted) { 14028 /* We have a problem */ 14029 bbr_setup_less_of_rate(bbr, cts, 14030 bbr->r_ctl.crte->rate, rate_wanted); 14031 } else { 14032 /* We are good */ 14033 bbr->gain_is_limited = 0; 14034 bbr->skip_gain = 0; 14035 } 14036 tcp_bbr_tso_size_check(bbr, cts); 14037 } else { 14038 bbr_type_log_hdwr_pacing(bbr, 14039 inp->inp_route.ro_nh->nh_ifp, 14040 rate_wanted, 14041 0, 14042 __LINE__, cts, err); 14043 BBR_STAT_INC(bbr_hdwr_rl_add_fail); 14044 } 14045 } 14046 if (bbr->bbr_hdrw_pacing) { 14047 /* 14048 * Worry about cases where the route 14049 * changes or something happened that we 14050 * lost our hardware pacing possibly during 14051 * the last ip_output call. 14052 */ 14053 if (inp->inp_snd_tag == NULL) { 14054 /* A change during ip output disabled hw pacing? */ 14055 bbr->bbr_hdrw_pacing = 0; 14056 } else if ((inp->inp_route.ro_nh == NULL) || 14057 (inp->inp_route.ro_nh->nh_ifp != inp->inp_snd_tag->ifp)) { 14058 /* 14059 * We had an interface or route change, 14060 * detach from the current hdwr pacing 14061 * and setup to re-attempt next go 14062 * round. 14063 */ 14064 bbr->bbr_hdrw_pacing = 0; 14065 bbr->bbr_attempt_hdwr_pace = 0; 14066 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 14067 tcp_bbr_tso_size_check(bbr, cts); 14068 } 14069 } 14070 /* 14071 * Data sent (as far as we can tell). If this advertises a larger 14072 * window than any other segment, then remember the size of the 14073 * advertised window. Any pending ACK has now been sent. 14074 */ 14075 if (SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv)) 14076 tp->rcv_adv = tp->rcv_nxt + recwin; 14077 14078 tp->last_ack_sent = tp->rcv_nxt; 14079 if ((error == 0) && 14080 (bbr->r_ctl.rc_pace_max_segs > tp->t_maxseg) && 14081 (doing_tlp == 0) && 14082 (tso == 0) && 14083 (len > 0) && 14084 ((flags & TH_RST) == 0) && 14085 ((flags & TH_SYN) == 0) && 14086 (IN_RECOVERY(tp->t_flags) == 0) && 14087 (bbr->rc_in_persist == 0) && 14088 (tot_len < bbr->r_ctl.rc_pace_max_segs)) { 14089 /* 14090 * For non-tso we need to goto again until we have sent out 14091 * enough data to match what we are hptsi out every hptsi 14092 * interval. 14093 */ 14094 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14095 /* Make sure snd_nxt is drug up */ 14096 tp->snd_nxt = tp->snd_max; 14097 } 14098 if (rsm != NULL) { 14099 rsm = NULL; 14100 goto skip_again; 14101 } 14102 rsm = NULL; 14103 sack_rxmit = 0; 14104 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK); 14105 goto again; 14106 } 14107 skip_again: 14108 if ((error == 0) && (flags & TH_FIN)) 14109 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN); 14110 if ((error == 0) && (flags & TH_RST)) 14111 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 14112 if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) { 14113 /* 14114 * Calculate/Re-Calculate the hptsi slot in usecs based on 14115 * what we have sent so far 14116 */ 14117 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 14118 if (bbr->rc_no_pacing) 14119 slot = 0; 14120 } 14121 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK); 14122 enobufs: 14123 if (bbr->rc_use_google == 0) 14124 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 14125 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 14126 bbr->r_ctl.rc_lost_bytes))); 14127 bbr->rc_output_starts_timer = 1; 14128 if (bbr->bbr_use_rack_cheat && 14129 (more_to_rxt || 14130 ((bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts)) != NULL))) { 14131 /* Rack cheats and shotguns out all rxt's 1ms apart */ 14132 if (slot > 1000) 14133 slot = 1000; 14134 } 14135 if (bbr->bbr_hdrw_pacing && (bbr->hw_pacing_set == 0)) { 14136 /* 14137 * We don't change the tso size until some number of sends 14138 * to give the hardware commands time to get down 14139 * to the interface. 14140 */ 14141 bbr->r_ctl.bbr_hdwr_cnt_noset_snt++; 14142 if (bbr->r_ctl.bbr_hdwr_cnt_noset_snt >= bbr_hdwr_pacing_delay_cnt) { 14143 bbr->hw_pacing_set = 1; 14144 tcp_bbr_tso_size_check(bbr, cts); 14145 } 14146 } 14147 bbr_start_hpts_timer(bbr, tp, cts, 12, slot, tot_len); 14148 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14149 /* Make sure snd_nxt is drug up */ 14150 tp->snd_nxt = tp->snd_max; 14151 } 14152 return (error); 14153 14154 } 14155 14156 /* 14157 * See bbr_output_wtime() for return values. 14158 */ 14159 static int 14160 bbr_output(struct tcpcb *tp) 14161 { 14162 int32_t ret; 14163 struct timeval tv; 14164 struct tcp_bbr *bbr; 14165 14166 NET_EPOCH_ASSERT(); 14167 14168 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14169 INP_WLOCK_ASSERT(tp->t_inpcb); 14170 (void)tcp_get_usecs(&tv); 14171 ret = bbr_output_wtime(tp, &tv); 14172 return (ret); 14173 } 14174 14175 static void 14176 bbr_mtu_chg(struct tcpcb *tp) 14177 { 14178 struct tcp_bbr *bbr; 14179 struct bbr_sendmap *rsm, *frsm = NULL; 14180 uint32_t maxseg; 14181 14182 /* 14183 * The MTU has changed. a) Clear the sack filter. b) Mark everything 14184 * over the current size as SACK_PASS so a retransmit will occur. 14185 */ 14186 14187 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14188 maxseg = tp->t_maxseg - bbr->rc_last_options; 14189 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 14190 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 14191 /* Don't mess with ones acked (by sack?) */ 14192 if (rsm->r_flags & BBR_ACKED) 14193 continue; 14194 if ((rsm->r_end - rsm->r_start) > maxseg) { 14195 /* 14196 * We mark sack-passed on all the previous large 14197 * sends we did. This will force them to retransmit. 14198 */ 14199 rsm->r_flags |= BBR_SACK_PASSED; 14200 if (((rsm->r_flags & BBR_MARKED_LOST) == 0) && 14201 bbr_is_lost(bbr, rsm, bbr->r_ctl.rc_rcvtime)) { 14202 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 14203 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 14204 rsm->r_flags |= BBR_MARKED_LOST; 14205 } 14206 if (frsm == NULL) 14207 frsm = rsm; 14208 } 14209 } 14210 if (frsm) { 14211 bbr->r_ctl.rc_resend = frsm; 14212 } 14213 } 14214 14215 static int 14216 bbr_pru_options(struct tcpcb *tp, int flags) 14217 { 14218 if (flags & PRUS_OOB) 14219 return (EOPNOTSUPP); 14220 return (0); 14221 } 14222 14223 struct tcp_function_block __tcp_bbr = { 14224 .tfb_tcp_block_name = __XSTRING(STACKNAME), 14225 .tfb_tcp_output = bbr_output, 14226 .tfb_do_queued_segments = ctf_do_queued_segments, 14227 .tfb_do_segment_nounlock = bbr_do_segment_nounlock, 14228 .tfb_tcp_do_segment = bbr_do_segment, 14229 .tfb_tcp_ctloutput = bbr_ctloutput, 14230 .tfb_tcp_fb_init = bbr_init, 14231 .tfb_tcp_fb_fini = bbr_fini, 14232 .tfb_tcp_timer_stop_all = bbr_stopall, 14233 .tfb_tcp_timer_activate = bbr_timer_activate, 14234 .tfb_tcp_timer_active = bbr_timer_active, 14235 .tfb_tcp_timer_stop = bbr_timer_stop, 14236 .tfb_tcp_rexmit_tmr = bbr_remxt_tmr, 14237 .tfb_tcp_handoff_ok = bbr_handoff_ok, 14238 .tfb_tcp_mtu_chg = bbr_mtu_chg, 14239 .tfb_pru_options = bbr_pru_options, 14240 }; 14241 14242 /* 14243 * bbr_ctloutput() must drop the inpcb lock before performing copyin on 14244 * socket option arguments. When it re-acquires the lock after the copy, it 14245 * has to revalidate that the connection is still valid for the socket 14246 * option. 14247 */ 14248 static int 14249 bbr_set_sockopt(struct socket *so, struct sockopt *sopt, 14250 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14251 { 14252 struct epoch_tracker et; 14253 int32_t error = 0, optval; 14254 14255 switch (sopt->sopt_name) { 14256 case TCP_RACK_PACE_MAX_SEG: 14257 case TCP_RACK_MIN_TO: 14258 case TCP_RACK_REORD_THRESH: 14259 case TCP_RACK_REORD_FADE: 14260 case TCP_RACK_TLP_THRESH: 14261 case TCP_RACK_PKT_DELAY: 14262 case TCP_BBR_ALGORITHM: 14263 case TCP_BBR_TSLIMITS: 14264 case TCP_BBR_IWINTSO: 14265 case TCP_BBR_RECFORCE: 14266 case TCP_BBR_STARTUP_PG: 14267 case TCP_BBR_DRAIN_PG: 14268 case TCP_BBR_RWND_IS_APP: 14269 case TCP_BBR_PROBE_RTT_INT: 14270 case TCP_BBR_PROBE_RTT_GAIN: 14271 case TCP_BBR_PROBE_RTT_LEN: 14272 case TCP_BBR_STARTUP_LOSS_EXIT: 14273 case TCP_BBR_USEDEL_RATE: 14274 case TCP_BBR_MIN_RTO: 14275 case TCP_BBR_MAX_RTO: 14276 case TCP_BBR_PACE_PER_SEC: 14277 case TCP_DELACK: 14278 case TCP_BBR_PACE_DEL_TAR: 14279 case TCP_BBR_SEND_IWND_IN_TSO: 14280 case TCP_BBR_EXTRA_STATE: 14281 case TCP_BBR_UTTER_MAX_TSO: 14282 case TCP_BBR_MIN_TOPACEOUT: 14283 case TCP_BBR_FLOOR_MIN_TSO: 14284 case TCP_BBR_TSTMP_RAISES: 14285 case TCP_BBR_POLICER_DETECT: 14286 case TCP_BBR_USE_RACK_CHEAT: 14287 case TCP_DATA_AFTER_CLOSE: 14288 case TCP_BBR_HDWR_PACE: 14289 case TCP_BBR_PACE_SEG_MAX: 14290 case TCP_BBR_PACE_SEG_MIN: 14291 case TCP_BBR_PACE_CROSS: 14292 case TCP_BBR_PACE_OH: 14293 #ifdef NETFLIX_PEAKRATE 14294 case TCP_MAXPEAKRATE: 14295 #endif 14296 case TCP_BBR_TMR_PACE_OH: 14297 case TCP_BBR_RACK_RTT_USE: 14298 case TCP_BBR_RETRAN_WTSO: 14299 break; 14300 default: 14301 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14302 break; 14303 } 14304 INP_WUNLOCK(inp); 14305 error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); 14306 if (error) 14307 return (error); 14308 INP_WLOCK(inp); 14309 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 14310 INP_WUNLOCK(inp); 14311 return (ECONNRESET); 14312 } 14313 tp = intotcpcb(inp); 14314 if (tp->t_fb != &__tcp_bbr) { 14315 INP_WUNLOCK(inp); 14316 return (ENOPROTOOPT); 14317 } 14318 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14319 switch (sopt->sopt_name) { 14320 case TCP_BBR_PACE_PER_SEC: 14321 BBR_OPTS_INC(tcp_bbr_pace_per_sec); 14322 bbr->r_ctl.bbr_hptsi_per_second = optval; 14323 break; 14324 case TCP_BBR_PACE_DEL_TAR: 14325 BBR_OPTS_INC(tcp_bbr_pace_del_tar); 14326 bbr->r_ctl.bbr_hptsi_segments_delay_tar = optval; 14327 break; 14328 case TCP_BBR_PACE_SEG_MAX: 14329 BBR_OPTS_INC(tcp_bbr_pace_seg_max); 14330 bbr->r_ctl.bbr_hptsi_segments_max = optval; 14331 break; 14332 case TCP_BBR_PACE_SEG_MIN: 14333 BBR_OPTS_INC(tcp_bbr_pace_seg_min); 14334 bbr->r_ctl.bbr_hptsi_bytes_min = optval; 14335 break; 14336 case TCP_BBR_PACE_CROSS: 14337 BBR_OPTS_INC(tcp_bbr_pace_cross); 14338 bbr->r_ctl.bbr_cross_over = optval; 14339 break; 14340 case TCP_BBR_ALGORITHM: 14341 BBR_OPTS_INC(tcp_bbr_algorithm); 14342 if (optval && (bbr->rc_use_google == 0)) { 14343 /* Turn on the google mode */ 14344 bbr_google_mode_on(bbr); 14345 if ((optval > 3) && (optval < 500)) { 14346 /* 14347 * Must be at least greater than .3% 14348 * and must be less than 50.0%. 14349 */ 14350 bbr->r_ctl.bbr_google_discount = optval; 14351 } 14352 } else if ((optval == 0) && (bbr->rc_use_google == 1)) { 14353 /* Turn off the google mode */ 14354 bbr_google_mode_off(bbr); 14355 } 14356 break; 14357 case TCP_BBR_TSLIMITS: 14358 BBR_OPTS_INC(tcp_bbr_tslimits); 14359 if (optval == 1) 14360 bbr->rc_use_ts_limit = 1; 14361 else if (optval == 0) 14362 bbr->rc_use_ts_limit = 0; 14363 else 14364 error = EINVAL; 14365 break; 14366 14367 case TCP_BBR_IWINTSO: 14368 BBR_OPTS_INC(tcp_bbr_iwintso); 14369 if ((optval >= 0) && (optval < 128)) { 14370 uint32_t twin; 14371 14372 bbr->rc_init_win = optval; 14373 twin = bbr_initial_cwnd(bbr, tp); 14374 if ((bbr->rc_past_init_win == 0) && (twin > tp->snd_cwnd)) 14375 tp->snd_cwnd = twin; 14376 else 14377 error = EBUSY; 14378 } else 14379 error = EINVAL; 14380 break; 14381 case TCP_BBR_STARTUP_PG: 14382 BBR_OPTS_INC(tcp_bbr_startup_pg); 14383 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) { 14384 bbr->r_ctl.rc_startup_pg = optval; 14385 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 14386 bbr->r_ctl.rc_bbr_hptsi_gain = optval; 14387 } 14388 } else 14389 error = EINVAL; 14390 break; 14391 case TCP_BBR_DRAIN_PG: 14392 BBR_OPTS_INC(tcp_bbr_drain_pg); 14393 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) 14394 bbr->r_ctl.rc_drain_pg = optval; 14395 else 14396 error = EINVAL; 14397 break; 14398 case TCP_BBR_PROBE_RTT_LEN: 14399 BBR_OPTS_INC(tcp_bbr_probertt_len); 14400 if (optval <= 1) 14401 reset_time_small(&bbr->r_ctl.rc_rttprop, (optval * USECS_IN_SECOND)); 14402 else 14403 error = EINVAL; 14404 break; 14405 case TCP_BBR_PROBE_RTT_GAIN: 14406 BBR_OPTS_INC(tcp_bbr_probertt_gain); 14407 if (optval <= BBR_UNIT) 14408 bbr->r_ctl.bbr_rttprobe_gain_val = optval; 14409 else 14410 error = EINVAL; 14411 break; 14412 case TCP_BBR_PROBE_RTT_INT: 14413 BBR_OPTS_INC(tcp_bbr_probe_rtt_int); 14414 if (optval > 1000) 14415 bbr->r_ctl.rc_probertt_int = optval; 14416 else 14417 error = EINVAL; 14418 break; 14419 case TCP_BBR_MIN_TOPACEOUT: 14420 BBR_OPTS_INC(tcp_bbr_topaceout); 14421 if (optval == 0) { 14422 bbr->no_pacing_until = 0; 14423 bbr->rc_no_pacing = 0; 14424 } else if (optval <= 0x00ff) { 14425 bbr->no_pacing_until = optval; 14426 if ((bbr->r_ctl.rc_pkt_epoch < bbr->no_pacing_until) && 14427 (bbr->rc_bbr_state == BBR_STATE_STARTUP)){ 14428 /* Turn on no pacing */ 14429 bbr->rc_no_pacing = 1; 14430 } 14431 } else 14432 error = EINVAL; 14433 break; 14434 case TCP_BBR_STARTUP_LOSS_EXIT: 14435 BBR_OPTS_INC(tcp_bbr_startup_loss_exit); 14436 bbr->rc_loss_exit = optval; 14437 break; 14438 case TCP_BBR_USEDEL_RATE: 14439 error = EINVAL; 14440 break; 14441 case TCP_BBR_MIN_RTO: 14442 BBR_OPTS_INC(tcp_bbr_min_rto); 14443 bbr->r_ctl.rc_min_rto_ms = optval; 14444 break; 14445 case TCP_BBR_MAX_RTO: 14446 BBR_OPTS_INC(tcp_bbr_max_rto); 14447 bbr->rc_max_rto_sec = optval; 14448 break; 14449 case TCP_RACK_MIN_TO: 14450 /* Minimum time between rack t-o's in ms */ 14451 BBR_OPTS_INC(tcp_rack_min_to); 14452 bbr->r_ctl.rc_min_to = optval; 14453 break; 14454 case TCP_RACK_REORD_THRESH: 14455 /* RACK reorder threshold (shift amount) */ 14456 BBR_OPTS_INC(tcp_rack_reord_thresh); 14457 if ((optval > 0) && (optval < 31)) 14458 bbr->r_ctl.rc_reorder_shift = optval; 14459 else 14460 error = EINVAL; 14461 break; 14462 case TCP_RACK_REORD_FADE: 14463 /* Does reordering fade after ms time */ 14464 BBR_OPTS_INC(tcp_rack_reord_fade); 14465 bbr->r_ctl.rc_reorder_fade = optval; 14466 break; 14467 case TCP_RACK_TLP_THRESH: 14468 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 14469 BBR_OPTS_INC(tcp_rack_tlp_thresh); 14470 if (optval) 14471 bbr->rc_tlp_threshold = optval; 14472 else 14473 error = EINVAL; 14474 break; 14475 case TCP_BBR_USE_RACK_CHEAT: 14476 BBR_OPTS_INC(tcp_use_rackcheat); 14477 if (bbr->rc_use_google) { 14478 error = EINVAL; 14479 break; 14480 } 14481 BBR_OPTS_INC(tcp_rack_cheat); 14482 if (optval) 14483 bbr->bbr_use_rack_cheat = 1; 14484 else 14485 bbr->bbr_use_rack_cheat = 0; 14486 break; 14487 case TCP_BBR_FLOOR_MIN_TSO: 14488 BBR_OPTS_INC(tcp_utter_max_tso); 14489 if ((optval >= 0) && (optval < 40)) 14490 bbr->r_ctl.bbr_hptsi_segments_floor = optval; 14491 else 14492 error = EINVAL; 14493 break; 14494 case TCP_BBR_UTTER_MAX_TSO: 14495 BBR_OPTS_INC(tcp_utter_max_tso); 14496 if ((optval >= 0) && (optval < 0xffff)) 14497 bbr->r_ctl.bbr_utter_max = optval; 14498 else 14499 error = EINVAL; 14500 break; 14501 14502 case TCP_BBR_EXTRA_STATE: 14503 BBR_OPTS_INC(tcp_extra_state); 14504 if (optval) 14505 bbr->rc_use_idle_restart = 1; 14506 else 14507 bbr->rc_use_idle_restart = 0; 14508 break; 14509 case TCP_BBR_SEND_IWND_IN_TSO: 14510 BBR_OPTS_INC(tcp_iwnd_tso); 14511 if (optval) { 14512 bbr->bbr_init_win_cheat = 1; 14513 if (bbr->rc_past_init_win == 0) { 14514 uint32_t cts; 14515 cts = tcp_get_usecs(&bbr->rc_tv); 14516 tcp_bbr_tso_size_check(bbr, cts); 14517 } 14518 } else 14519 bbr->bbr_init_win_cheat = 0; 14520 break; 14521 case TCP_BBR_HDWR_PACE: 14522 BBR_OPTS_INC(tcp_hdwr_pacing); 14523 if (optval){ 14524 bbr->bbr_hdw_pace_ena = 1; 14525 bbr->bbr_attempt_hdwr_pace = 0; 14526 } else { 14527 bbr->bbr_hdw_pace_ena = 0; 14528 #ifdef RATELIMIT 14529 if (bbr->r_ctl.crte != NULL) { 14530 tcp_rel_pacing_rate(bbr->r_ctl.crte, tp); 14531 bbr->r_ctl.crte = NULL; 14532 } 14533 #endif 14534 } 14535 break; 14536 14537 case TCP_DELACK: 14538 BBR_OPTS_INC(tcp_delack); 14539 if (optval < 100) { 14540 if (optval == 0) /* off */ 14541 tp->t_delayed_ack = 0; 14542 else if (optval == 1) /* on which is 2 */ 14543 tp->t_delayed_ack = 2; 14544 else /* higher than 2 and less than 100 */ 14545 tp->t_delayed_ack = optval; 14546 if (tp->t_flags & TF_DELACK) { 14547 tp->t_flags &= ~TF_DELACK; 14548 tp->t_flags |= TF_ACKNOW; 14549 NET_EPOCH_ENTER(et); 14550 bbr_output(tp); 14551 NET_EPOCH_EXIT(et); 14552 } 14553 } else 14554 error = EINVAL; 14555 break; 14556 case TCP_RACK_PKT_DELAY: 14557 /* RACK added ms i.e. rack-rtt + reord + N */ 14558 BBR_OPTS_INC(tcp_rack_pkt_delay); 14559 bbr->r_ctl.rc_pkt_delay = optval; 14560 break; 14561 #ifdef NETFLIX_PEAKRATE 14562 case TCP_MAXPEAKRATE: 14563 BBR_OPTS_INC(tcp_maxpeak); 14564 error = tcp_set_maxpeakrate(tp, optval); 14565 if (!error) 14566 tp->t_peakrate_thr = tp->t_maxpeakrate; 14567 break; 14568 #endif 14569 case TCP_BBR_RETRAN_WTSO: 14570 BBR_OPTS_INC(tcp_retran_wtso); 14571 if (optval) 14572 bbr->rc_resends_use_tso = 1; 14573 else 14574 bbr->rc_resends_use_tso = 0; 14575 break; 14576 case TCP_DATA_AFTER_CLOSE: 14577 BBR_OPTS_INC(tcp_data_ac); 14578 if (optval) 14579 bbr->rc_allow_data_af_clo = 1; 14580 else 14581 bbr->rc_allow_data_af_clo = 0; 14582 break; 14583 case TCP_BBR_POLICER_DETECT: 14584 BBR_OPTS_INC(tcp_policer_det); 14585 if (bbr->rc_use_google == 0) 14586 error = EINVAL; 14587 else if (optval) 14588 bbr->r_use_policer = 1; 14589 else 14590 bbr->r_use_policer = 0; 14591 break; 14592 14593 case TCP_BBR_TSTMP_RAISES: 14594 BBR_OPTS_INC(tcp_ts_raises); 14595 if (optval) 14596 bbr->ts_can_raise = 1; 14597 else 14598 bbr->ts_can_raise = 0; 14599 break; 14600 case TCP_BBR_TMR_PACE_OH: 14601 BBR_OPTS_INC(tcp_pacing_oh_tmr); 14602 if (bbr->rc_use_google) { 14603 error = EINVAL; 14604 } else { 14605 if (optval) 14606 bbr->r_ctl.rc_incr_tmrs = 1; 14607 else 14608 bbr->r_ctl.rc_incr_tmrs = 0; 14609 } 14610 break; 14611 case TCP_BBR_PACE_OH: 14612 BBR_OPTS_INC(tcp_pacing_oh); 14613 if (bbr->rc_use_google) { 14614 error = EINVAL; 14615 } else { 14616 if (optval > (BBR_INCL_TCP_OH| 14617 BBR_INCL_IP_OH| 14618 BBR_INCL_ENET_OH)) { 14619 error = EINVAL; 14620 break; 14621 } 14622 if (optval & BBR_INCL_TCP_OH) 14623 bbr->r_ctl.rc_inc_tcp_oh = 1; 14624 else 14625 bbr->r_ctl.rc_inc_tcp_oh = 0; 14626 if (optval & BBR_INCL_IP_OH) 14627 bbr->r_ctl.rc_inc_ip_oh = 1; 14628 else 14629 bbr->r_ctl.rc_inc_ip_oh = 0; 14630 if (optval & BBR_INCL_ENET_OH) 14631 bbr->r_ctl.rc_inc_enet_oh = 1; 14632 else 14633 bbr->r_ctl.rc_inc_enet_oh = 0; 14634 } 14635 break; 14636 default: 14637 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14638 break; 14639 } 14640 #ifdef NETFLIX_STATS 14641 tcp_log_socket_option(tp, sopt->sopt_name, optval, error); 14642 #endif 14643 INP_WUNLOCK(inp); 14644 return (error); 14645 } 14646 14647 /* 14648 * return 0 on success, error-num on failure 14649 */ 14650 static int 14651 bbr_get_sockopt(struct socket *so, struct sockopt *sopt, 14652 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14653 { 14654 int32_t error, optval; 14655 14656 /* 14657 * Because all our options are either boolean or an int, we can just 14658 * pull everything into optval and then unlock and copy. If we ever 14659 * add a option that is not a int, then this will have quite an 14660 * impact to this routine. 14661 */ 14662 switch (sopt->sopt_name) { 14663 case TCP_BBR_PACE_PER_SEC: 14664 optval = bbr->r_ctl.bbr_hptsi_per_second; 14665 break; 14666 case TCP_BBR_PACE_DEL_TAR: 14667 optval = bbr->r_ctl.bbr_hptsi_segments_delay_tar; 14668 break; 14669 case TCP_BBR_PACE_SEG_MAX: 14670 optval = bbr->r_ctl.bbr_hptsi_segments_max; 14671 break; 14672 case TCP_BBR_MIN_TOPACEOUT: 14673 optval = bbr->no_pacing_until; 14674 break; 14675 case TCP_BBR_PACE_SEG_MIN: 14676 optval = bbr->r_ctl.bbr_hptsi_bytes_min; 14677 break; 14678 case TCP_BBR_PACE_CROSS: 14679 optval = bbr->r_ctl.bbr_cross_over; 14680 break; 14681 case TCP_BBR_ALGORITHM: 14682 optval = bbr->rc_use_google; 14683 break; 14684 case TCP_BBR_TSLIMITS: 14685 optval = bbr->rc_use_ts_limit; 14686 break; 14687 case TCP_BBR_IWINTSO: 14688 optval = bbr->rc_init_win; 14689 break; 14690 case TCP_BBR_STARTUP_PG: 14691 optval = bbr->r_ctl.rc_startup_pg; 14692 break; 14693 case TCP_BBR_DRAIN_PG: 14694 optval = bbr->r_ctl.rc_drain_pg; 14695 break; 14696 case TCP_BBR_PROBE_RTT_INT: 14697 optval = bbr->r_ctl.rc_probertt_int; 14698 break; 14699 case TCP_BBR_PROBE_RTT_LEN: 14700 optval = (bbr->r_ctl.rc_rttprop.cur_time_limit / USECS_IN_SECOND); 14701 break; 14702 case TCP_BBR_PROBE_RTT_GAIN: 14703 optval = bbr->r_ctl.bbr_rttprobe_gain_val; 14704 break; 14705 case TCP_BBR_STARTUP_LOSS_EXIT: 14706 optval = bbr->rc_loss_exit; 14707 break; 14708 case TCP_BBR_USEDEL_RATE: 14709 error = EINVAL; 14710 break; 14711 case TCP_BBR_MIN_RTO: 14712 optval = bbr->r_ctl.rc_min_rto_ms; 14713 break; 14714 case TCP_BBR_MAX_RTO: 14715 optval = bbr->rc_max_rto_sec; 14716 break; 14717 case TCP_RACK_PACE_MAX_SEG: 14718 /* Max segments in a pace */ 14719 optval = bbr->r_ctl.rc_pace_max_segs; 14720 break; 14721 case TCP_RACK_MIN_TO: 14722 /* Minimum time between rack t-o's in ms */ 14723 optval = bbr->r_ctl.rc_min_to; 14724 break; 14725 case TCP_RACK_REORD_THRESH: 14726 /* RACK reorder threshold (shift amount) */ 14727 optval = bbr->r_ctl.rc_reorder_shift; 14728 break; 14729 case TCP_RACK_REORD_FADE: 14730 /* Does reordering fade after ms time */ 14731 optval = bbr->r_ctl.rc_reorder_fade; 14732 break; 14733 case TCP_BBR_USE_RACK_CHEAT: 14734 /* Do we use the rack cheat for rxt */ 14735 optval = bbr->bbr_use_rack_cheat; 14736 break; 14737 case TCP_BBR_FLOOR_MIN_TSO: 14738 optval = bbr->r_ctl.bbr_hptsi_segments_floor; 14739 break; 14740 case TCP_BBR_UTTER_MAX_TSO: 14741 optval = bbr->r_ctl.bbr_utter_max; 14742 break; 14743 case TCP_BBR_SEND_IWND_IN_TSO: 14744 /* Do we send TSO size segments initially */ 14745 optval = bbr->bbr_init_win_cheat; 14746 break; 14747 case TCP_BBR_EXTRA_STATE: 14748 optval = bbr->rc_use_idle_restart; 14749 break; 14750 case TCP_RACK_TLP_THRESH: 14751 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 14752 optval = bbr->rc_tlp_threshold; 14753 break; 14754 case TCP_RACK_PKT_DELAY: 14755 /* RACK added ms i.e. rack-rtt + reord + N */ 14756 optval = bbr->r_ctl.rc_pkt_delay; 14757 break; 14758 case TCP_BBR_RETRAN_WTSO: 14759 optval = bbr->rc_resends_use_tso; 14760 break; 14761 case TCP_DATA_AFTER_CLOSE: 14762 optval = bbr->rc_allow_data_af_clo; 14763 break; 14764 case TCP_DELACK: 14765 optval = tp->t_delayed_ack; 14766 break; 14767 case TCP_BBR_HDWR_PACE: 14768 optval = bbr->bbr_hdw_pace_ena; 14769 break; 14770 case TCP_BBR_POLICER_DETECT: 14771 optval = bbr->r_use_policer; 14772 break; 14773 case TCP_BBR_TSTMP_RAISES: 14774 optval = bbr->ts_can_raise; 14775 break; 14776 case TCP_BBR_TMR_PACE_OH: 14777 optval = bbr->r_ctl.rc_incr_tmrs; 14778 break; 14779 case TCP_BBR_PACE_OH: 14780 optval = 0; 14781 if (bbr->r_ctl.rc_inc_tcp_oh) 14782 optval |= BBR_INCL_TCP_OH; 14783 if (bbr->r_ctl.rc_inc_ip_oh) 14784 optval |= BBR_INCL_IP_OH; 14785 if (bbr->r_ctl.rc_inc_enet_oh) 14786 optval |= BBR_INCL_ENET_OH; 14787 break; 14788 default: 14789 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14790 break; 14791 } 14792 INP_WUNLOCK(inp); 14793 error = sooptcopyout(sopt, &optval, sizeof optval); 14794 return (error); 14795 } 14796 14797 /* 14798 * return 0 on success, error-num on failure 14799 */ 14800 static int 14801 bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 14802 { 14803 int32_t error = EINVAL; 14804 struct tcp_bbr *bbr; 14805 14806 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14807 if (bbr == NULL) { 14808 /* Huh? */ 14809 goto out; 14810 } 14811 if (sopt->sopt_dir == SOPT_SET) { 14812 return (bbr_set_sockopt(so, sopt, inp, tp, bbr)); 14813 } else if (sopt->sopt_dir == SOPT_GET) { 14814 return (bbr_get_sockopt(so, sopt, inp, tp, bbr)); 14815 } 14816 out: 14817 INP_WUNLOCK(inp); 14818 return (error); 14819 } 14820 14821 static const char *bbr_stack_names[] = { 14822 __XSTRING(STACKNAME), 14823 #ifdef STACKALIAS 14824 __XSTRING(STACKALIAS), 14825 #endif 14826 }; 14827 14828 static bool bbr_mod_inited = false; 14829 14830 static int 14831 tcp_addbbr(module_t mod, int32_t type, void *data) 14832 { 14833 int32_t err = 0; 14834 int num_stacks; 14835 14836 switch (type) { 14837 case MOD_LOAD: 14838 printf("Attempting to load " __XSTRING(MODNAME) "\n"); 14839 bbr_zone = uma_zcreate(__XSTRING(MODNAME) "_map", 14840 sizeof(struct bbr_sendmap), 14841 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 14842 bbr_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb", 14843 sizeof(struct tcp_bbr), 14844 NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 14845 sysctl_ctx_init(&bbr_sysctl_ctx); 14846 bbr_sysctl_root = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 14847 SYSCTL_STATIC_CHILDREN(_net_inet_tcp), 14848 OID_AUTO, 14849 #ifdef STACKALIAS 14850 __XSTRING(STACKALIAS), 14851 #else 14852 __XSTRING(STACKNAME), 14853 #endif 14854 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 14855 ""); 14856 if (bbr_sysctl_root == NULL) { 14857 printf("Failed to add sysctl node\n"); 14858 err = EFAULT; 14859 goto free_uma; 14860 } 14861 bbr_init_sysctls(); 14862 num_stacks = nitems(bbr_stack_names); 14863 err = register_tcp_functions_as_names(&__tcp_bbr, M_WAITOK, 14864 bbr_stack_names, &num_stacks); 14865 if (err) { 14866 printf("Failed to register %s stack name for " 14867 "%s module\n", bbr_stack_names[num_stacks], 14868 __XSTRING(MODNAME)); 14869 sysctl_ctx_free(&bbr_sysctl_ctx); 14870 free_uma: 14871 uma_zdestroy(bbr_zone); 14872 uma_zdestroy(bbr_pcb_zone); 14873 bbr_counter_destroy(); 14874 printf("Failed to register " __XSTRING(MODNAME) 14875 " module err:%d\n", err); 14876 return (err); 14877 } 14878 tcp_lro_reg_mbufq(); 14879 bbr_mod_inited = true; 14880 printf(__XSTRING(MODNAME) " is now available\n"); 14881 break; 14882 case MOD_QUIESCE: 14883 err = deregister_tcp_functions(&__tcp_bbr, true, false); 14884 break; 14885 case MOD_UNLOAD: 14886 err = deregister_tcp_functions(&__tcp_bbr, false, true); 14887 if (err == EBUSY) 14888 break; 14889 if (bbr_mod_inited) { 14890 uma_zdestroy(bbr_zone); 14891 uma_zdestroy(bbr_pcb_zone); 14892 sysctl_ctx_free(&bbr_sysctl_ctx); 14893 bbr_counter_destroy(); 14894 printf(__XSTRING(MODNAME) 14895 " is now no longer available\n"); 14896 bbr_mod_inited = false; 14897 } 14898 tcp_lro_dereg_mbufq(); 14899 err = 0; 14900 break; 14901 default: 14902 return (EOPNOTSUPP); 14903 } 14904 return (err); 14905 } 14906 14907 static moduledata_t tcp_bbr = { 14908 .name = __XSTRING(MODNAME), 14909 .evhand = tcp_addbbr, 14910 .priv = 0 14911 }; 14912 14913 MODULE_VERSION(MODNAME, 1); 14914 DECLARE_MODULE(MODNAME, tcp_bbr, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 14915 MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1); 14916