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 "Maximum 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_runningslot; 2433 log.u_bbr.bw_inuse = diag->wheel_slot; 2434 log.u_bbr.rttProp = diag->wheel_cts; 2435 log.u_bbr.delRate = diag->maxslots; 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 { 3523 3524 #ifdef INET 3525 seg_oh += sizeof(struct ip); 3526 #endif 3527 } 3528 } 3529 if (bbr->r_ctl.rc_inc_enet_oh) { 3530 /* Do we include the ethernet overhead? */ 3531 seg_oh += sizeof(struct ether_header); 3532 } 3533 return(seg_oh); 3534 } 3535 3536 static uint32_t 3537 bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, uint32_t useconds_time, uint64_t bw) 3538 { 3539 uint64_t divor, res, tim; 3540 3541 if (useconds_time == 0) 3542 return (0); 3543 gain = bbr_gain_adjust(bbr, gain); 3544 divor = (uint64_t)USECS_IN_SECOND * (uint64_t)BBR_UNIT; 3545 tim = useconds_time; 3546 res = (tim * bw * gain) / divor; 3547 if (res == 0) 3548 res = 1; 3549 return ((uint32_t)res); 3550 } 3551 3552 /* 3553 * Given a gain and a length return the delay in useconds that 3554 * should be used to evenly space out packets 3555 * on the connection (based on the gain factor). 3556 */ 3557 static uint32_t 3558 bbr_get_pacing_delay(struct tcp_bbr *bbr, uint16_t gain, int32_t len, uint32_t cts, int nolog) 3559 { 3560 uint64_t bw, lentim, res; 3561 uint32_t usecs, srtt, over = 0; 3562 uint32_t seg_oh, num_segs, maxseg; 3563 3564 if (len == 0) 3565 return (0); 3566 3567 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 3568 num_segs = (len + maxseg - 1) / maxseg; 3569 if (bbr->rc_use_google == 0) { 3570 seg_oh = bbr_get_header_oh(bbr); 3571 len += (num_segs * seg_oh); 3572 } 3573 gain = bbr_gain_adjust(bbr, gain); 3574 bw = bbr_get_bw(bbr); 3575 if (bbr->rc_use_google) { 3576 uint64_t cbw; 3577 3578 /* 3579 * Reduce the b/w by the google discount 3580 * factor 10 = 1%. 3581 */ 3582 cbw = bw * (uint64_t)(1000 - bbr->r_ctl.bbr_google_discount); 3583 cbw /= (uint64_t)1000; 3584 /* We don't apply a discount if it results in 0 */ 3585 if (cbw > 0) 3586 bw = cbw; 3587 } 3588 lentim = ((uint64_t)len * 3589 (uint64_t)USECS_IN_SECOND * 3590 (uint64_t)BBR_UNIT); 3591 res = lentim / ((uint64_t)gain * bw); 3592 if (res == 0) 3593 res = 1; 3594 usecs = (uint32_t)res; 3595 srtt = bbr_get_rtt(bbr, BBR_SRTT); 3596 if (bbr_hptsi_max_mul && bbr_hptsi_max_div && 3597 (bbr->rc_use_google == 0) && 3598 (usecs > ((srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div))) { 3599 /* 3600 * We cannot let the delay be more than 1/2 the srtt time. 3601 * Otherwise we cannot pace out or send properly. 3602 */ 3603 over = usecs = (srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div; 3604 BBR_STAT_INC(bbr_hpts_min_time); 3605 } 3606 if (!nolog) 3607 bbr_log_pacing_delay_calc(bbr, gain, len, cts, usecs, bw, over, 1); 3608 return (usecs); 3609 } 3610 3611 static void 3612 bbr_ack_received(struct tcpcb *tp, struct tcp_bbr *bbr, struct tcphdr *th, uint32_t bytes_this_ack, 3613 uint32_t sack_changed, uint32_t prev_acked, int32_t line, uint32_t losses) 3614 { 3615 INP_WLOCK_ASSERT(tp->t_inpcb); 3616 uint64_t bw; 3617 uint32_t cwnd, target_cwnd, saved_bytes, maxseg; 3618 int32_t meth; 3619 3620 #ifdef STATS 3621 if ((tp->t_flags & TF_GPUTINPROG) && 3622 SEQ_GEQ(th->th_ack, tp->gput_ack)) { 3623 /* 3624 * Strech acks and compressed acks will cause this to 3625 * oscillate but we are doing it the same way as the main 3626 * stack so it will be compariable (though possibly not 3627 * ideal). 3628 */ 3629 int32_t cgput; 3630 int64_t gput, time_stamp; 3631 3632 gput = (int64_t) (th->th_ack - tp->gput_seq) * 8; 3633 time_stamp = max(1, ((bbr->r_ctl.rc_rcvtime - tp->gput_ts) / 1000)); 3634 cgput = gput / time_stamp; 3635 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT, 3636 cgput); 3637 if (tp->t_stats_gput_prev > 0) 3638 stats_voi_update_abs_s32(tp->t_stats, 3639 VOI_TCP_GPUT_ND, 3640 ((gput - tp->t_stats_gput_prev) * 100) / 3641 tp->t_stats_gput_prev); 3642 tp->t_flags &= ~TF_GPUTINPROG; 3643 tp->t_stats_gput_prev = cgput; 3644 } 3645 #endif 3646 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3647 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 3648 /* We don't change anything in probe-rtt */ 3649 return; 3650 } 3651 maxseg = tp->t_maxseg - bbr->rc_last_options; 3652 saved_bytes = bytes_this_ack; 3653 bytes_this_ack += sack_changed; 3654 if (bytes_this_ack > prev_acked) { 3655 bytes_this_ack -= prev_acked; 3656 /* 3657 * A byte ack'd gives us a full mss 3658 * to be like linux i.e. they count packets. 3659 */ 3660 if ((bytes_this_ack < maxseg) && bbr->rc_use_google) 3661 bytes_this_ack = maxseg; 3662 } else { 3663 /* Unlikely */ 3664 bytes_this_ack = 0; 3665 } 3666 cwnd = tp->snd_cwnd; 3667 bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3668 if (bw) 3669 target_cwnd = bbr_get_target_cwnd(bbr, 3670 bw, 3671 (uint32_t)bbr->r_ctl.rc_bbr_cwnd_gain); 3672 else 3673 target_cwnd = bbr_initial_cwnd(bbr, bbr->rc_tp); 3674 if (IN_RECOVERY(tp->t_flags) && 3675 (bbr->bbr_prev_in_rec == 0)) { 3676 /* 3677 * We are entering recovery and 3678 * thus packet conservation. 3679 */ 3680 bbr->pkt_conservation = 1; 3681 bbr->r_ctl.rc_recovery_start = bbr->r_ctl.rc_rcvtime; 3682 cwnd = ctf_flight_size(tp, 3683 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 3684 bytes_this_ack; 3685 } 3686 if (IN_RECOVERY(tp->t_flags)) { 3687 uint32_t flight; 3688 3689 bbr->bbr_prev_in_rec = 1; 3690 if (cwnd > losses) { 3691 cwnd -= losses; 3692 if (cwnd < maxseg) 3693 cwnd = maxseg; 3694 } else 3695 cwnd = maxseg; 3696 flight = ctf_flight_size(tp, 3697 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3698 bbr_log_type_cwndupd(bbr, flight, 0, 3699 losses, 10, 0, 0, line); 3700 if (bbr->pkt_conservation) { 3701 uint32_t time_in; 3702 3703 if (TSTMP_GEQ(bbr->r_ctl.rc_rcvtime, bbr->r_ctl.rc_recovery_start)) 3704 time_in = bbr->r_ctl.rc_rcvtime - bbr->r_ctl.rc_recovery_start; 3705 else 3706 time_in = 0; 3707 3708 if (time_in >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 3709 /* Clear packet conservation after an rttProp */ 3710 bbr->pkt_conservation = 0; 3711 } else { 3712 if ((flight + bytes_this_ack) > cwnd) 3713 cwnd = flight + bytes_this_ack; 3714 if (cwnd < get_min_cwnd(bbr)) 3715 cwnd = get_min_cwnd(bbr); 3716 tp->snd_cwnd = cwnd; 3717 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, 3718 prev_acked, 1, target_cwnd, th->th_ack, line); 3719 return; 3720 } 3721 } 3722 } else 3723 bbr->bbr_prev_in_rec = 0; 3724 if ((bbr->rc_use_google == 0) && bbr->r_ctl.restrict_growth) { 3725 bbr->r_ctl.restrict_growth--; 3726 if (bytes_this_ack > maxseg) 3727 bytes_this_ack = maxseg; 3728 } 3729 if (bbr->rc_filled_pipe) { 3730 /* 3731 * Here we have exited startup and filled the pipe. We will 3732 * thus allow the cwnd to shrink to the target. We hit here 3733 * mostly. 3734 */ 3735 uint32_t s_cwnd; 3736 3737 meth = 2; 3738 s_cwnd = min((cwnd + bytes_this_ack), target_cwnd); 3739 if (s_cwnd > cwnd) 3740 cwnd = s_cwnd; 3741 else if (bbr_cwnd_may_shrink || bbr->rc_use_google || bbr->rc_no_pacing) 3742 cwnd = s_cwnd; 3743 } else { 3744 /* 3745 * Here we are still in startup, we increase cwnd by what 3746 * has been acked. 3747 */ 3748 if ((cwnd < target_cwnd) || 3749 (bbr->rc_past_init_win == 0)) { 3750 meth = 3; 3751 cwnd += bytes_this_ack; 3752 } else { 3753 /* 3754 * Method 4 means we are at target so no gain in 3755 * startup and past the initial window. 3756 */ 3757 meth = 4; 3758 } 3759 } 3760 tp->snd_cwnd = max(cwnd, get_min_cwnd(bbr)); 3761 bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, prev_acked, meth, target_cwnd, th->th_ack, line); 3762 } 3763 3764 static void 3765 tcp_bbr_partialack(struct tcpcb *tp) 3766 { 3767 struct tcp_bbr *bbr; 3768 3769 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3770 INP_WLOCK_ASSERT(tp->t_inpcb); 3771 if (ctf_flight_size(tp, 3772 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 3773 tp->snd_cwnd) { 3774 bbr->r_wanted_output = 1; 3775 } 3776 } 3777 3778 static void 3779 bbr_post_recovery(struct tcpcb *tp) 3780 { 3781 struct tcp_bbr *bbr; 3782 uint32_t flight; 3783 3784 INP_WLOCK_ASSERT(tp->t_inpcb); 3785 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3786 /* 3787 * Here we just exit recovery. 3788 */ 3789 EXIT_RECOVERY(tp->t_flags); 3790 /* Lock in our b/w reduction for the specified number of pkt-epochs */ 3791 bbr->r_recovery_bw = 0; 3792 tp->snd_recover = tp->snd_una; 3793 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3794 bbr->pkt_conservation = 0; 3795 if (bbr->rc_use_google == 0) { 3796 /* 3797 * For non-google mode lets 3798 * go ahead and make sure we clear 3799 * the recovery state so if we 3800 * bounce back in to recovery we 3801 * will do PC. 3802 */ 3803 bbr->bbr_prev_in_rec = 0; 3804 } 3805 bbr_log_type_exit_rec(bbr); 3806 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 3807 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 3808 bbr_log_type_cwndupd(bbr, 0, 0, 0, 15, 0, 0, __LINE__); 3809 } else { 3810 /* For probe-rtt case lets fix up its saved_cwnd */ 3811 if (bbr->r_ctl.rc_saved_cwnd < bbr->r_ctl.rc_cwnd_on_ent) { 3812 bbr->r_ctl.rc_saved_cwnd = bbr->r_ctl.rc_cwnd_on_ent; 3813 bbr_log_type_cwndupd(bbr, 0, 0, 0, 16, 0, 0, __LINE__); 3814 } 3815 } 3816 flight = ctf_flight_size(tp, 3817 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 3818 if ((bbr->rc_use_google == 0) && 3819 bbr_do_red) { 3820 uint64_t val, lr2use; 3821 uint32_t maxseg, newcwnd, acks_inflight, ratio, cwnd; 3822 uint32_t *cwnd_p; 3823 3824 if (bbr_get_rtt(bbr, BBR_SRTT)) { 3825 val = ((uint64_t)bbr_get_rtt(bbr, BBR_RTT_PROP) * (uint64_t)1000); 3826 val /= bbr_get_rtt(bbr, BBR_SRTT); 3827 ratio = (uint32_t)val; 3828 } else 3829 ratio = 1000; 3830 3831 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, 3832 bbr->r_ctl.recovery_lr, 21, 3833 ratio, 3834 bbr->r_ctl.rc_red_cwnd_pe, 3835 __LINE__); 3836 if ((ratio < bbr_do_red) || (bbr_do_red == 0)) 3837 goto done; 3838 if (((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 3839 bbr_prtt_slam_cwnd) || 3840 (bbr_sub_drain_slam_cwnd && 3841 (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 3842 bbr->rc_hit_state_1 && 3843 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) || 3844 ((bbr->rc_bbr_state == BBR_STATE_DRAIN) && 3845 bbr_slam_cwnd_in_main_drain)) { 3846 /* 3847 * Here we must poke at the saved cwnd 3848 * as well as the cwnd. 3849 */ 3850 cwnd = bbr->r_ctl.rc_saved_cwnd; 3851 cwnd_p = &bbr->r_ctl.rc_saved_cwnd; 3852 } else { 3853 cwnd = tp->snd_cwnd; 3854 cwnd_p = &tp->snd_cwnd; 3855 } 3856 maxseg = tp->t_maxseg - bbr->rc_last_options; 3857 /* Add the overall lr with the recovery lr */ 3858 if (bbr->r_ctl.rc_lost == 0) 3859 lr2use = 0; 3860 else if (bbr->r_ctl.rc_delivered == 0) 3861 lr2use = 1000; 3862 else { 3863 lr2use = bbr->r_ctl.rc_lost * 1000; 3864 lr2use /= bbr->r_ctl.rc_delivered; 3865 } 3866 lr2use += bbr->r_ctl.recovery_lr; 3867 acks_inflight = (flight / (maxseg * 2)); 3868 if (bbr_red_scale) { 3869 lr2use *= bbr_get_rtt(bbr, BBR_SRTT); 3870 lr2use /= bbr_red_scale; 3871 if ((bbr_red_growth_restrict) && 3872 ((bbr_get_rtt(bbr, BBR_SRTT)/bbr_red_scale) > 1)) 3873 bbr->r_ctl.restrict_growth += acks_inflight; 3874 } 3875 if (lr2use) { 3876 val = (uint64_t)cwnd * lr2use; 3877 val /= 1000; 3878 if (cwnd > val) 3879 newcwnd = roundup((cwnd - val), maxseg); 3880 else 3881 newcwnd = maxseg; 3882 } else { 3883 val = (uint64_t)cwnd * (uint64_t)bbr_red_mul; 3884 val /= (uint64_t)bbr_red_div; 3885 newcwnd = roundup((uint32_t)val, maxseg); 3886 } 3887 /* with standard delayed acks how many acks can I expect? */ 3888 if (bbr_drop_limit == 0) { 3889 /* 3890 * Anticpate how much we will 3891 * raise the cwnd based on the acks. 3892 */ 3893 if ((newcwnd + (acks_inflight * maxseg)) < get_min_cwnd(bbr)) { 3894 /* We do enforce the min (with the acks) */ 3895 newcwnd = (get_min_cwnd(bbr) - acks_inflight); 3896 } 3897 } else { 3898 /* 3899 * A strict drop limit of N is is inplace 3900 */ 3901 if (newcwnd < (bbr_drop_limit * maxseg)) { 3902 newcwnd = bbr_drop_limit * maxseg; 3903 } 3904 } 3905 /* For the next N acks do we restrict the growth */ 3906 *cwnd_p = newcwnd; 3907 if (tp->snd_cwnd > newcwnd) 3908 tp->snd_cwnd = newcwnd; 3909 bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, val, 22, 3910 (uint32_t)lr2use, 3911 bbr_get_rtt(bbr, BBR_SRTT), __LINE__); 3912 bbr->r_ctl.rc_red_cwnd_pe = bbr->r_ctl.rc_pkt_epoch; 3913 } 3914 done: 3915 bbr->r_ctl.recovery_lr = 0; 3916 if (flight <= tp->snd_cwnd) { 3917 bbr->r_wanted_output = 1; 3918 } 3919 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3920 } 3921 3922 static void 3923 bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts) 3924 { 3925 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 3926 /* Limit the drop in b/w to 1/2 our current filter. */ 3927 if (bbr->r_ctl.red_bw > bbr->r_ctl.rc_bbr_cur_del_rate) 3928 bbr->r_ctl.red_bw = bbr->r_ctl.rc_bbr_cur_del_rate; 3929 if (bbr->r_ctl.red_bw < (get_filter_value(&bbr->r_ctl.rc_delrate) / 2)) 3930 bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate) / 2; 3931 tcp_bbr_tso_size_check(bbr, cts); 3932 } 3933 3934 static void 3935 bbr_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type, struct bbr_sendmap *rsm) 3936 { 3937 struct tcp_bbr *bbr; 3938 3939 INP_WLOCK_ASSERT(tp->t_inpcb); 3940 #ifdef STATS 3941 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_CSIG, type); 3942 #endif 3943 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 3944 switch (type) { 3945 case CC_NDUPACK: 3946 if (!IN_RECOVERY(tp->t_flags)) { 3947 tp->snd_recover = tp->snd_max; 3948 /* Start a new epoch */ 3949 bbr_set_pktepoch(bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 3950 if (bbr->rc_lt_is_sampling || bbr->rc_lt_use_bw) { 3951 /* 3952 * Move forward the lt epoch 3953 * so it won't count the truncated 3954 * epoch. 3955 */ 3956 bbr->r_ctl.rc_lt_epoch++; 3957 } 3958 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 3959 /* 3960 * Just like the policer detection code 3961 * if we are in startup we must push 3962 * forward the last startup epoch 3963 * to hide the truncated PE. 3964 */ 3965 bbr->r_ctl.rc_bbr_last_startup_epoch++; 3966 } 3967 bbr->r_ctl.rc_cwnd_on_ent = tp->snd_cwnd; 3968 ENTER_RECOVERY(tp->t_flags); 3969 bbr->rc_tlp_rtx_out = 0; 3970 bbr->r_ctl.recovery_lr = bbr->r_ctl.rc_pkt_epoch_loss_rate; 3971 tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); 3972 if (bbr->rc_inp->inp_in_hpts && 3973 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) == 0)) { 3974 /* 3975 * When we enter recovery, we need to restart 3976 * any timers. This may mean we gain an agg 3977 * early, which will be made up for at the last 3978 * rxt out. 3979 */ 3980 bbr->rc_timer_first = 1; 3981 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 3982 } 3983 /* 3984 * Calculate a new cwnd based on to the current 3985 * delivery rate with no gain. We get the bdp 3986 * without gaining it up like we normally would and 3987 * we use the last cur_del_rate. 3988 */ 3989 if ((bbr->rc_use_google == 0) && 3990 (bbr->r_ctl.bbr_rttprobe_gain_val || 3991 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT))) { 3992 tp->snd_cwnd = ctf_flight_size(tp, 3993 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 3994 (tp->t_maxseg - bbr->rc_last_options); 3995 if (tp->snd_cwnd < get_min_cwnd(bbr)) { 3996 /* We always gate to min cwnd */ 3997 tp->snd_cwnd = get_min_cwnd(bbr); 3998 } 3999 bbr_log_type_cwndupd(bbr, 0, 0, 0, 14, 0, 0, __LINE__); 4000 } 4001 bbr_log_type_enter_rec(bbr, rsm->r_start); 4002 } 4003 break; 4004 case CC_RTO_ERR: 4005 KMOD_TCPSTAT_INC(tcps_sndrexmitbad); 4006 /* RTO was unnecessary, so reset everything. */ 4007 bbr_reset_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime); 4008 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 4009 tp->snd_cwnd = tp->snd_cwnd_prev; 4010 tp->snd_ssthresh = tp->snd_ssthresh_prev; 4011 tp->snd_recover = tp->snd_recover_prev; 4012 tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); 4013 bbr_log_type_cwndupd(bbr, 0, 0, 0, 13, 0, 0, __LINE__); 4014 } 4015 tp->t_badrxtwin = 0; 4016 break; 4017 } 4018 } 4019 4020 /* 4021 * Indicate whether this ack should be delayed. We can delay the ack if 4022 * following conditions are met: 4023 * - There is no delayed ack timer in progress. 4024 * - Our last ack wasn't a 0-sized window. We never want to delay 4025 * the ack that opens up a 0-sized window. 4026 * - LRO wasn't used for this segment. We make sure by checking that the 4027 * segment size is not larger than the MSS. 4028 * - Delayed acks are enabled or this is a half-synchronized T/TCP 4029 * connection. 4030 * - The data being acked is less than a full segment (a stretch ack 4031 * of more than a segment we should ack. 4032 * - nsegs is 1 (if its more than that we received more than 1 ack). 4033 */ 4034 #define DELAY_ACK(tp, bbr, nsegs) \ 4035 (((tp->t_flags & TF_RXWIN0SENT) == 0) && \ 4036 ((tp->t_flags & TF_DELACK) == 0) && \ 4037 ((bbr->bbr_segs_rcvd + nsegs) < tp->t_delayed_ack) && \ 4038 (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN))) 4039 4040 /* 4041 * Return the lowest RSM in the map of 4042 * packets still in flight that is not acked. 4043 * This should normally find on the first one 4044 * since we remove packets from the send 4045 * map after they are marked ACKED. 4046 */ 4047 static struct bbr_sendmap * 4048 bbr_find_lowest_rsm(struct tcp_bbr *bbr) 4049 { 4050 struct bbr_sendmap *rsm; 4051 4052 /* 4053 * Walk the time-order transmitted list looking for an rsm that is 4054 * not acked. This will be the one that was sent the longest time 4055 * ago that is still outstanding. 4056 */ 4057 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_tmap, r_tnext) { 4058 if (rsm->r_flags & BBR_ACKED) { 4059 continue; 4060 } 4061 goto finish; 4062 } 4063 finish: 4064 return (rsm); 4065 } 4066 4067 static struct bbr_sendmap * 4068 bbr_find_high_nonack(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 4069 { 4070 struct bbr_sendmap *prsm; 4071 4072 /* 4073 * Walk the sequence order list backward until we hit and arrive at 4074 * the highest seq not acked. In theory when this is called it 4075 * should be the last segment (which it was not). 4076 */ 4077 prsm = rsm; 4078 TAILQ_FOREACH_REVERSE_FROM(prsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4079 if (prsm->r_flags & (BBR_ACKED | BBR_HAS_FIN)) { 4080 continue; 4081 } 4082 return (prsm); 4083 } 4084 return (NULL); 4085 } 4086 4087 /* 4088 * Returns to the caller the number of microseconds that 4089 * the packet can be outstanding before we think we 4090 * should have had an ack returned. 4091 */ 4092 static uint32_t 4093 bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm) 4094 { 4095 /* 4096 * lro is the flag we use to determine if we have seen reordering. 4097 * If it gets set we have seen reordering. The reorder logic either 4098 * works in one of two ways: 4099 * 4100 * If reorder-fade is configured, then we track the last time we saw 4101 * re-ordering occur. If we reach the point where enough time as 4102 * passed we no longer consider reordering has occuring. 4103 * 4104 * Or if reorder-face is 0, then once we see reordering we consider 4105 * the connection to alway be subject to reordering and just set lro 4106 * to 1. 4107 * 4108 * In the end if lro is non-zero we add the extra time for 4109 * reordering in. 4110 */ 4111 int32_t lro; 4112 uint32_t thresh, t_rxtcur; 4113 4114 if (srtt == 0) 4115 srtt = 1; 4116 if (bbr->r_ctl.rc_reorder_ts) { 4117 if (bbr->r_ctl.rc_reorder_fade) { 4118 if (SEQ_GEQ(cts, bbr->r_ctl.rc_reorder_ts)) { 4119 lro = cts - bbr->r_ctl.rc_reorder_ts; 4120 if (lro == 0) { 4121 /* 4122 * No time as passed since the last 4123 * reorder, mark it as reordering. 4124 */ 4125 lro = 1; 4126 } 4127 } else { 4128 /* Negative time? */ 4129 lro = 0; 4130 } 4131 if (lro > bbr->r_ctl.rc_reorder_fade) { 4132 /* Turn off reordering seen too */ 4133 bbr->r_ctl.rc_reorder_ts = 0; 4134 lro = 0; 4135 } 4136 } else { 4137 /* Reodering does not fade */ 4138 lro = 1; 4139 } 4140 } else { 4141 lro = 0; 4142 } 4143 thresh = srtt + bbr->r_ctl.rc_pkt_delay; 4144 if (lro) { 4145 /* It must be set, if not you get 1/4 rtt */ 4146 if (bbr->r_ctl.rc_reorder_shift) 4147 thresh += (srtt >> bbr->r_ctl.rc_reorder_shift); 4148 else 4149 thresh += (srtt >> 2); 4150 } else { 4151 thresh += 1000; 4152 } 4153 /* We don't let the rack timeout be above a RTO */ 4154 if ((bbr->rc_tp)->t_srtt == 0) 4155 t_rxtcur = BBR_INITIAL_RTO; 4156 else 4157 t_rxtcur = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); 4158 if (thresh > t_rxtcur) { 4159 thresh = t_rxtcur; 4160 } 4161 /* And we don't want it above the RTO max either */ 4162 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4163 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4164 } 4165 bbr_log_thresh_choice(bbr, cts, thresh, lro, srtt, rsm, BBR_TO_FRM_RACK); 4166 return (thresh); 4167 } 4168 4169 /* 4170 * Return to the caller the amount of time in mico-seconds 4171 * that should be used for the TLP timer from the last 4172 * send time of this packet. 4173 */ 4174 static uint32_t 4175 bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, 4176 struct bbr_sendmap *rsm, uint32_t srtt, 4177 uint32_t cts) 4178 { 4179 uint32_t thresh, len, maxseg, t_rxtcur; 4180 struct bbr_sendmap *prsm; 4181 4182 if (srtt == 0) 4183 srtt = 1; 4184 if (bbr->rc_tlp_threshold) 4185 thresh = srtt + (srtt / bbr->rc_tlp_threshold); 4186 else 4187 thresh = (srtt * 2); 4188 maxseg = tp->t_maxseg - bbr->rc_last_options; 4189 /* Get the previous sent packet, if any */ 4190 len = rsm->r_end - rsm->r_start; 4191 4192 /* 2.1 behavior */ 4193 prsm = TAILQ_PREV(rsm, bbr_head, r_tnext); 4194 if (prsm && (len <= maxseg)) { 4195 /* 4196 * Two packets outstanding, thresh should be (2*srtt) + 4197 * possible inter-packet delay (if any). 4198 */ 4199 uint32_t inter_gap = 0; 4200 int idx, nidx; 4201 4202 idx = rsm->r_rtr_cnt - 1; 4203 nidx = prsm->r_rtr_cnt - 1; 4204 if (TSTMP_GEQ(rsm->r_tim_lastsent[nidx], prsm->r_tim_lastsent[idx])) { 4205 /* Yes it was sent later (or at the same time) */ 4206 inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx]; 4207 } 4208 thresh += inter_gap; 4209 } else if (len <= maxseg) { 4210 /* 4211 * Possibly compensate for delayed-ack. 4212 */ 4213 uint32_t alt_thresh; 4214 4215 alt_thresh = srtt + (srtt / 2) + bbr_delayed_ack_time; 4216 if (alt_thresh > thresh) 4217 thresh = alt_thresh; 4218 } 4219 /* Not above the current RTO */ 4220 if (tp->t_srtt == 0) 4221 t_rxtcur = BBR_INITIAL_RTO; 4222 else 4223 t_rxtcur = TICKS_2_USEC(tp->t_rxtcur); 4224 4225 bbr_log_thresh_choice(bbr, cts, thresh, t_rxtcur, srtt, rsm, BBR_TO_FRM_TLP); 4226 /* Not above an RTO */ 4227 if (thresh > t_rxtcur) { 4228 thresh = t_rxtcur; 4229 } 4230 /* Not above a RTO max */ 4231 if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { 4232 thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); 4233 } 4234 /* And now apply the user TLP min */ 4235 if (thresh < bbr_tlp_min) { 4236 thresh = bbr_tlp_min; 4237 } 4238 return (thresh); 4239 } 4240 4241 /* 4242 * Return one of three RTTs to use (in microseconds). 4243 */ 4244 static __inline uint32_t 4245 bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type) 4246 { 4247 uint32_t f_rtt; 4248 uint32_t srtt; 4249 4250 f_rtt = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 4251 if (get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) { 4252 /* We have no rtt at all */ 4253 if (bbr->rc_tp->t_srtt == 0) 4254 f_rtt = BBR_INITIAL_RTO; 4255 else 4256 f_rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4257 /* 4258 * Since we don't know how good the rtt is apply a 4259 * delayed-ack min 4260 */ 4261 if (f_rtt < bbr_delayed_ack_time) { 4262 f_rtt = bbr_delayed_ack_time; 4263 } 4264 } 4265 /* Take the filter version or last measured pkt-rtt */ 4266 if (rtt_type == BBR_RTT_PROP) { 4267 srtt = f_rtt; 4268 } else if (rtt_type == BBR_RTT_PKTRTT) { 4269 if (bbr->r_ctl.rc_pkt_epoch_rtt) { 4270 srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 4271 } else { 4272 /* No pkt rtt yet */ 4273 srtt = f_rtt; 4274 } 4275 } else if (rtt_type == BBR_RTT_RACK) { 4276 srtt = bbr->r_ctl.rc_last_rtt; 4277 /* We need to add in any internal delay for our timer */ 4278 if (bbr->rc_ack_was_delayed) 4279 srtt += bbr->r_ctl.rc_ack_hdwr_delay; 4280 } else if (rtt_type == BBR_SRTT) { 4281 srtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 4282 } else { 4283 /* TSNH */ 4284 srtt = f_rtt; 4285 #ifdef BBR_INVARIANTS 4286 panic("Unknown rtt request type %d", rtt_type); 4287 #endif 4288 } 4289 return (srtt); 4290 } 4291 4292 static int 4293 bbr_is_lost(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t cts) 4294 { 4295 uint32_t thresh; 4296 4297 thresh = bbr_calc_thresh_rack(bbr, bbr_get_rtt(bbr, BBR_RTT_RACK), 4298 cts, rsm); 4299 if ((cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) >= thresh) { 4300 /* It is lost (past time) */ 4301 return (1); 4302 } 4303 return (0); 4304 } 4305 4306 /* 4307 * Return a sendmap if we need to retransmit something. 4308 */ 4309 static struct bbr_sendmap * 4310 bbr_check_recovery_mode(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4311 { 4312 /* 4313 * Check to see that we don't need to fall into recovery. We will 4314 * need to do so if our oldest transmit is past the time we should 4315 * have had an ack. 4316 */ 4317 4318 struct bbr_sendmap *rsm; 4319 int32_t idx; 4320 4321 if (TAILQ_EMPTY(&bbr->r_ctl.rc_map)) { 4322 /* Nothing outstanding that we know of */ 4323 return (NULL); 4324 } 4325 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 4326 if (rsm == NULL) { 4327 /* Nothing in the transmit map */ 4328 return (NULL); 4329 } 4330 if (tp->t_flags & TF_SENTFIN) { 4331 /* Fin restricted, don't find anything once a fin is sent */ 4332 return (NULL); 4333 } 4334 if (rsm->r_flags & BBR_ACKED) { 4335 /* 4336 * Ok the first one is acked (this really should not happen 4337 * since we remove the from the tmap once they are acked) 4338 */ 4339 rsm = bbr_find_lowest_rsm(bbr); 4340 if (rsm == NULL) 4341 return (NULL); 4342 } 4343 idx = rsm->r_rtr_cnt - 1; 4344 if (SEQ_LEQ(cts, rsm->r_tim_lastsent[idx])) { 4345 /* Send timestamp is the same or less? can't be ready */ 4346 return (NULL); 4347 } 4348 /* Get our RTT time */ 4349 if (bbr_is_lost(bbr, rsm, cts) && 4350 ((rsm->r_dupack >= DUP_ACK_THRESHOLD) || 4351 (rsm->r_flags & BBR_SACK_PASSED))) { 4352 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4353 rsm->r_flags |= BBR_MARKED_LOST; 4354 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4355 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4356 } 4357 bbr_cong_signal(tp, NULL, CC_NDUPACK, rsm); 4358 #ifdef BBR_INVARIANTS 4359 if ((rsm->r_end - rsm->r_start) == 0) 4360 panic("tp:%p bbr:%p rsm:%p length is 0?", tp, bbr, rsm); 4361 #endif 4362 return (rsm); 4363 } 4364 return (NULL); 4365 } 4366 4367 /* 4368 * RACK Timer, here we simply do logging and house keeping. 4369 * the normal bbr_output_wtime() function will call the 4370 * appropriate thing to check if we need to do a RACK retransmit. 4371 * We return 1, saying don't proceed with bbr_output_wtime only 4372 * when all timers have been stopped (destroyed PCB?). 4373 */ 4374 static int 4375 bbr_timeout_rack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4376 { 4377 /* 4378 * This timer simply provides an internal trigger to send out data. 4379 * The check_recovery_mode call will see if there are needed 4380 * retransmissions, if so we will enter fast-recovery. The output 4381 * call may or may not do the same thing depending on sysctl 4382 * settings. 4383 */ 4384 uint32_t lost; 4385 4386 if (bbr->rc_all_timers_stopped) { 4387 return (1); 4388 } 4389 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4390 /* Its not time yet */ 4391 return (0); 4392 } 4393 BBR_STAT_INC(bbr_to_tot); 4394 lost = bbr->r_ctl.rc_lost; 4395 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4396 bbr_set_state(tp, bbr, 0); 4397 bbr_log_to_event(bbr, cts, BBR_TO_FRM_RACK); 4398 if (bbr->r_ctl.rc_resend == NULL) { 4399 /* Lets do the check here */ 4400 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 4401 } 4402 if (bbr_policer_call_from_rack_to) 4403 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 4404 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK; 4405 return (0); 4406 } 4407 4408 static __inline void 4409 bbr_clone_rsm(struct tcp_bbr *bbr, struct bbr_sendmap *nrsm, struct bbr_sendmap *rsm, uint32_t start) 4410 { 4411 int idx; 4412 4413 nrsm->r_start = start; 4414 nrsm->r_end = rsm->r_end; 4415 nrsm->r_rtr_cnt = rsm->r_rtr_cnt; 4416 nrsm-> r_rtt_not_allowed = rsm->r_rtt_not_allowed; 4417 nrsm->r_flags = rsm->r_flags; 4418 /* We don't transfer forward the SYN flag */ 4419 nrsm->r_flags &= ~BBR_HAS_SYN; 4420 /* We move forward the FIN flag, not that this should happen */ 4421 rsm->r_flags &= ~BBR_HAS_FIN; 4422 nrsm->r_dupack = rsm->r_dupack; 4423 nrsm->r_rtr_bytes = 0; 4424 nrsm->r_is_gain = rsm->r_is_gain; 4425 nrsm->r_is_drain = rsm->r_is_drain; 4426 nrsm->r_delivered = rsm->r_delivered; 4427 nrsm->r_ts_valid = rsm->r_ts_valid; 4428 nrsm->r_del_ack_ts = rsm->r_del_ack_ts; 4429 nrsm->r_del_time = rsm->r_del_time; 4430 nrsm->r_app_limited = rsm->r_app_limited; 4431 nrsm->r_first_sent_time = rsm->r_first_sent_time; 4432 nrsm->r_flight_at_send = rsm->r_flight_at_send; 4433 /* We split a piece the lower section looses any just_ret flag. */ 4434 nrsm->r_bbr_state = rsm->r_bbr_state; 4435 for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { 4436 nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; 4437 } 4438 rsm->r_end = nrsm->r_start; 4439 idx = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); 4440 idx /= 8; 4441 /* Check if we got too small */ 4442 if ((rsm->r_is_smallmap == 0) && 4443 ((rsm->r_end - rsm->r_start) <= idx)) { 4444 bbr->r_ctl.rc_num_small_maps_alloced++; 4445 rsm->r_is_smallmap = 1; 4446 } 4447 /* Check the new one as well */ 4448 if ((nrsm->r_end - nrsm->r_start) <= idx) { 4449 bbr->r_ctl.rc_num_small_maps_alloced++; 4450 nrsm->r_is_smallmap = 1; 4451 } 4452 } 4453 4454 static int 4455 bbr_sack_mergable(struct bbr_sendmap *at, 4456 uint32_t start, uint32_t end) 4457 { 4458 /* 4459 * Given a sack block defined by 4460 * start and end, and a current postion 4461 * at. Return 1 if either side of at 4462 * would show that the block is mergable 4463 * to that side. A block to be mergable 4464 * must have overlap with the start/end 4465 * and be in the SACK'd state. 4466 */ 4467 struct bbr_sendmap *l_rsm; 4468 struct bbr_sendmap *r_rsm; 4469 4470 /* first get the either side blocks */ 4471 l_rsm = TAILQ_PREV(at, bbr_head, r_next); 4472 r_rsm = TAILQ_NEXT(at, r_next); 4473 if (l_rsm && (l_rsm->r_flags & BBR_ACKED)) { 4474 /* Potentially mergeable */ 4475 if ((l_rsm->r_end == start) || 4476 (SEQ_LT(start, l_rsm->r_end) && 4477 SEQ_GT(end, l_rsm->r_end))) { 4478 /* 4479 * map blk |------| 4480 * sack blk |------| 4481 * <or> 4482 * map blk |------| 4483 * sack blk |------| 4484 */ 4485 return (1); 4486 } 4487 } 4488 if (r_rsm && (r_rsm->r_flags & BBR_ACKED)) { 4489 /* Potentially mergeable */ 4490 if ((r_rsm->r_start == end) || 4491 (SEQ_LT(start, r_rsm->r_start) && 4492 SEQ_GT(end, r_rsm->r_start))) { 4493 /* 4494 * map blk |---------| 4495 * sack blk |----| 4496 * <or> 4497 * map blk |---------| 4498 * sack blk |-------| 4499 */ 4500 return (1); 4501 } 4502 } 4503 return (0); 4504 } 4505 4506 static struct bbr_sendmap * 4507 bbr_merge_rsm(struct tcp_bbr *bbr, 4508 struct bbr_sendmap *l_rsm, 4509 struct bbr_sendmap *r_rsm) 4510 { 4511 /* 4512 * We are merging two ack'd RSM's, 4513 * the l_rsm is on the left (lower seq 4514 * values) and the r_rsm is on the right 4515 * (higher seq value). The simplest way 4516 * to merge these is to move the right 4517 * one into the left. I don't think there 4518 * is any reason we need to try to find 4519 * the oldest (or last oldest retransmitted). 4520 */ 4521 l_rsm->r_end = r_rsm->r_end; 4522 if (l_rsm->r_dupack < r_rsm->r_dupack) 4523 l_rsm->r_dupack = r_rsm->r_dupack; 4524 if (r_rsm->r_rtr_bytes) 4525 l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes; 4526 if (r_rsm->r_in_tmap) { 4527 /* This really should not happen */ 4528 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, r_rsm, r_tnext); 4529 } 4530 if (r_rsm->r_app_limited) 4531 l_rsm->r_app_limited = r_rsm->r_app_limited; 4532 /* Now the flags */ 4533 if (r_rsm->r_flags & BBR_HAS_FIN) 4534 l_rsm->r_flags |= BBR_HAS_FIN; 4535 if (r_rsm->r_flags & BBR_TLP) 4536 l_rsm->r_flags |= BBR_TLP; 4537 if (r_rsm->r_flags & BBR_RWND_COLLAPSED) 4538 l_rsm->r_flags |= BBR_RWND_COLLAPSED; 4539 if (r_rsm->r_flags & BBR_MARKED_LOST) { 4540 /* This really should not happen */ 4541 bbr->r_ctl.rc_lost_bytes -= r_rsm->r_end - r_rsm->r_start; 4542 } 4543 TAILQ_REMOVE(&bbr->r_ctl.rc_map, r_rsm, r_next); 4544 if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) { 4545 /* Transfer the split limit to the map we free */ 4546 r_rsm->r_limit_type = l_rsm->r_limit_type; 4547 l_rsm->r_limit_type = 0; 4548 } 4549 bbr_free(bbr, r_rsm); 4550 return(l_rsm); 4551 } 4552 4553 /* 4554 * TLP Timer, here we simply setup what segment we want to 4555 * have the TLP expire on, the normal bbr_output_wtime() will then 4556 * send it out. 4557 * 4558 * We return 1, saying don't proceed with bbr_output_wtime only 4559 * when all timers have been stopped (destroyed PCB?). 4560 */ 4561 static int 4562 bbr_timeout_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4563 { 4564 /* 4565 * Tail Loss Probe. 4566 */ 4567 struct bbr_sendmap *rsm = NULL; 4568 struct socket *so; 4569 uint32_t amm; 4570 uint32_t out, avail; 4571 uint32_t maxseg; 4572 int collapsed_win = 0; 4573 4574 if (bbr->rc_all_timers_stopped) { 4575 return (1); 4576 } 4577 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 4578 /* Its not time yet */ 4579 return (0); 4580 } 4581 if (ctf_progress_timeout_check(tp, true)) { 4582 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 4583 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4584 return (1); 4585 } 4586 /* Did we somehow get into persists? */ 4587 if (bbr->rc_in_persist) { 4588 return (0); 4589 } 4590 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4591 bbr_set_state(tp, bbr, 0); 4592 BBR_STAT_INC(bbr_tlp_tot); 4593 maxseg = tp->t_maxseg - bbr->rc_last_options; 4594 /* 4595 * A TLP timer has expired. We have been idle for 2 rtts. So we now 4596 * need to figure out how to force a full MSS segment out. 4597 */ 4598 so = tp->t_inpcb->inp_socket; 4599 avail = sbavail(&so->so_snd); 4600 out = ctf_outstanding(tp); 4601 if (out > tp->snd_wnd) { 4602 /* special case, we need a retransmission */ 4603 collapsed_win = 1; 4604 goto need_retran; 4605 } 4606 if (avail > out) { 4607 /* New data is available */ 4608 amm = avail - out; 4609 if (amm > maxseg) { 4610 amm = maxseg; 4611 } else if ((amm < maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) { 4612 /* not enough to fill a MTU and no-delay is off */ 4613 goto need_retran; 4614 } 4615 /* Set the send-new override */ 4616 if ((out + amm) <= tp->snd_wnd) { 4617 bbr->rc_tlp_new_data = 1; 4618 } else { 4619 goto need_retran; 4620 } 4621 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 4622 bbr->r_ctl.rc_last_tlp_seq = tp->snd_max; 4623 bbr->r_ctl.rc_tlp_send = NULL; 4624 /* cap any slots */ 4625 BBR_STAT_INC(bbr_tlp_newdata); 4626 goto send; 4627 } 4628 need_retran: 4629 /* 4630 * Ok we need to arrange the last un-acked segment to be re-sent, or 4631 * optionally the first un-acked segment. 4632 */ 4633 if (collapsed_win == 0) { 4634 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 4635 if (rsm && (BBR_ACKED | BBR_HAS_FIN)) { 4636 rsm = bbr_find_high_nonack(bbr, rsm); 4637 } 4638 if (rsm == NULL) { 4639 goto restore; 4640 } 4641 } else { 4642 /* 4643 * We must find the last segment 4644 * that was acceptable by the client. 4645 */ 4646 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 4647 if ((rsm->r_flags & BBR_RWND_COLLAPSED) == 0) { 4648 /* Found one */ 4649 break; 4650 } 4651 } 4652 if (rsm == NULL) { 4653 /* None? if so send the first */ 4654 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 4655 if (rsm == NULL) 4656 goto restore; 4657 } 4658 } 4659 if ((rsm->r_end - rsm->r_start) > maxseg) { 4660 /* 4661 * We need to split this the last segment in two. 4662 */ 4663 struct bbr_sendmap *nrsm; 4664 4665 nrsm = bbr_alloc_full_limit(bbr); 4666 if (nrsm == NULL) { 4667 /* 4668 * We can't get memory to split, we can either just 4669 * not split it. Or retransmit the whole piece, lets 4670 * do the large send (BTLP :-) ). 4671 */ 4672 goto go_for_it; 4673 } 4674 bbr_clone_rsm(bbr, nrsm, rsm, (rsm->r_end - maxseg)); 4675 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 4676 if (rsm->r_in_tmap) { 4677 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 4678 nrsm->r_in_tmap = 1; 4679 } 4680 rsm->r_flags &= (~BBR_HAS_FIN); 4681 rsm = nrsm; 4682 } 4683 go_for_it: 4684 bbr->r_ctl.rc_tlp_send = rsm; 4685 bbr->rc_tlp_rtx_out = 1; 4686 if (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) { 4687 bbr->r_ctl.rc_tlp_seg_send_cnt++; 4688 tp->t_rxtshift++; 4689 } else { 4690 bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; 4691 bbr->r_ctl.rc_tlp_seg_send_cnt = 1; 4692 } 4693 send: 4694 if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { 4695 /* 4696 * Can't [re]/transmit a segment we have retranmitted the 4697 * max times. We need the retransmit timer to take over. 4698 */ 4699 restore: 4700 bbr->rc_tlp_new_data = 0; 4701 bbr->r_ctl.rc_tlp_send = NULL; 4702 if (rsm) 4703 rsm->r_flags &= ~BBR_TLP; 4704 BBR_STAT_INC(bbr_tlp_retran_fail); 4705 return (0); 4706 } else if (rsm) { 4707 rsm->r_flags |= BBR_TLP; 4708 } 4709 if (rsm && (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) && 4710 (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend)) { 4711 /* 4712 * We have retransmitted to many times for TLP. Switch to 4713 * the regular RTO timer 4714 */ 4715 goto restore; 4716 } 4717 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TLP); 4718 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; 4719 return (0); 4720 } 4721 4722 /* 4723 * Delayed ack Timer, here we simply need to setup the 4724 * ACK_NOW flag and remove the DELACK flag. From there 4725 * the output routine will send the ack out. 4726 * 4727 * We only return 1, saying don't proceed, if all timers 4728 * are stopped (destroyed PCB?). 4729 */ 4730 static int 4731 bbr_timeout_delack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4732 { 4733 if (bbr->rc_all_timers_stopped) { 4734 return (1); 4735 } 4736 bbr_log_to_event(bbr, cts, BBR_TO_FRM_DELACK); 4737 tp->t_flags &= ~TF_DELACK; 4738 tp->t_flags |= TF_ACKNOW; 4739 KMOD_TCPSTAT_INC(tcps_delack); 4740 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK; 4741 return (0); 4742 } 4743 4744 /* 4745 * Here we send a KEEP-ALIVE like probe to the 4746 * peer, we do not send data. 4747 * 4748 * We only return 1, saying don't proceed, if all timers 4749 * are stopped (destroyed PCB?). 4750 */ 4751 static int 4752 bbr_timeout_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4753 { 4754 struct tcptemp *t_template; 4755 int32_t retval = 1; 4756 4757 if (bbr->rc_all_timers_stopped) { 4758 return (1); 4759 } 4760 if (bbr->rc_in_persist == 0) 4761 return (0); 4762 KASSERT(tp->t_inpcb != NULL, 4763 ("%s: tp %p tp->t_inpcb == NULL", __func__, tp)); 4764 /* 4765 * Persistence timer into zero window. Force a byte to be output, if 4766 * possible. 4767 */ 4768 bbr_log_to_event(bbr, cts, BBR_TO_FRM_PERSIST); 4769 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT; 4770 KMOD_TCPSTAT_INC(tcps_persisttimeo); 4771 /* 4772 * Have we exceeded the user specified progress time? 4773 */ 4774 if (ctf_progress_timeout_check(tp, true)) { 4775 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 4776 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4777 goto out; 4778 } 4779 /* 4780 * Hack: if the peer is dead/unreachable, we do not time out if the 4781 * window is closed. After a full backoff, drop the connection if 4782 * the idle time (no responses to probes) reaches the maximum 4783 * backoff that we would use if retransmitting. 4784 */ 4785 if (tp->t_rxtshift == TCP_MAXRXTSHIFT && 4786 (ticks - tp->t_rcvtime >= tcp_maxpersistidle || 4787 ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { 4788 KMOD_TCPSTAT_INC(tcps_persistdrop); 4789 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX); 4790 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4791 goto out; 4792 } 4793 if ((sbavail(&bbr->rc_inp->inp_socket->so_snd) == 0) && 4794 tp->snd_una == tp->snd_max) { 4795 bbr_exit_persist(tp, bbr, cts, __LINE__); 4796 retval = 0; 4797 goto out; 4798 } 4799 /* 4800 * If the user has closed the socket then drop a persisting 4801 * connection after a much reduced timeout. 4802 */ 4803 if (tp->t_state > TCPS_CLOSE_WAIT && 4804 (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) { 4805 KMOD_TCPSTAT_INC(tcps_persistdrop); 4806 tcp_log_end_status(tp, TCP_EI_STATUS_PERSIST_MAX); 4807 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4808 goto out; 4809 } 4810 t_template = tcpip_maketemplate(bbr->rc_inp); 4811 if (t_template) { 4812 tcp_respond(tp, t_template->tt_ipgen, 4813 &t_template->tt_t, (struct mbuf *)NULL, 4814 tp->rcv_nxt, tp->snd_una - 1, 0); 4815 /* This sends an ack */ 4816 if (tp->t_flags & TF_DELACK) 4817 tp->t_flags &= ~TF_DELACK; 4818 free(t_template, M_TEMP); 4819 } 4820 if (tp->t_rxtshift < TCP_MAXRXTSHIFT) 4821 tp->t_rxtshift++; 4822 bbr_start_hpts_timer(bbr, tp, cts, 3, 0, 0); 4823 out: 4824 return (retval); 4825 } 4826 4827 /* 4828 * If a keepalive goes off, we had no other timers 4829 * happening. We always return 1 here since this 4830 * routine either drops the connection or sends 4831 * out a segment with respond. 4832 */ 4833 static int 4834 bbr_timeout_keepalive(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4835 { 4836 struct tcptemp *t_template; 4837 struct inpcb *inp; 4838 4839 if (bbr->rc_all_timers_stopped) { 4840 return (1); 4841 } 4842 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP; 4843 inp = tp->t_inpcb; 4844 bbr_log_to_event(bbr, cts, BBR_TO_FRM_KEEP); 4845 /* 4846 * Keep-alive timer went off; send something or drop connection if 4847 * idle for too long. 4848 */ 4849 KMOD_TCPSTAT_INC(tcps_keeptimeo); 4850 if (tp->t_state < TCPS_ESTABLISHED) 4851 goto dropit; 4852 if ((V_tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && 4853 tp->t_state <= TCPS_CLOSING) { 4854 if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp)) 4855 goto dropit; 4856 /* 4857 * Send a packet designed to force a response if the peer is 4858 * up and reachable: either an ACK if the connection is 4859 * still alive, or an RST if the peer has closed the 4860 * connection due to timeout or reboot. Using sequence 4861 * number tp->snd_una-1 causes the transmitted zero-length 4862 * segment to lie outside the receive window; by the 4863 * protocol spec, this requires the correspondent TCP to 4864 * respond. 4865 */ 4866 KMOD_TCPSTAT_INC(tcps_keepprobe); 4867 t_template = tcpip_maketemplate(inp); 4868 if (t_template) { 4869 tcp_respond(tp, t_template->tt_ipgen, 4870 &t_template->tt_t, (struct mbuf *)NULL, 4871 tp->rcv_nxt, tp->snd_una - 1, 0); 4872 free(t_template, M_TEMP); 4873 } 4874 } 4875 bbr_start_hpts_timer(bbr, tp, cts, 4, 0, 0); 4876 return (1); 4877 dropit: 4878 KMOD_TCPSTAT_INC(tcps_keepdrops); 4879 tcp_log_end_status(tp, TCP_EI_STATUS_KEEP_MAX); 4880 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 4881 return (1); 4882 } 4883 4884 /* 4885 * Retransmit helper function, clear up all the ack 4886 * flags and take care of important book keeping. 4887 */ 4888 static void 4889 bbr_remxt_tmr(struct tcpcb *tp) 4890 { 4891 /* 4892 * The retransmit timer went off, all sack'd blocks must be 4893 * un-acked. 4894 */ 4895 struct bbr_sendmap *rsm, *trsm = NULL; 4896 struct tcp_bbr *bbr; 4897 uint32_t cts, lost; 4898 4899 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 4900 cts = tcp_get_usecs(&bbr->rc_tv); 4901 lost = bbr->r_ctl.rc_lost; 4902 if (bbr->r_state && (bbr->r_state != tp->t_state)) 4903 bbr_set_state(tp, bbr, 0); 4904 4905 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 4906 if (rsm->r_flags & BBR_ACKED) { 4907 uint32_t old_flags; 4908 4909 rsm->r_dupack = 0; 4910 if (rsm->r_in_tmap == 0) { 4911 /* We must re-add it back to the tlist */ 4912 if (trsm == NULL) { 4913 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 4914 } else { 4915 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, trsm, rsm, r_tnext); 4916 } 4917 rsm->r_in_tmap = 1; 4918 } 4919 old_flags = rsm->r_flags; 4920 rsm->r_flags |= BBR_RXT_CLEARED; 4921 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS); 4922 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 4923 } else { 4924 if ((tp->t_state < TCPS_ESTABLISHED) && 4925 (rsm->r_start == tp->snd_una)) { 4926 /* 4927 * Special case for TCP FO. Where 4928 * we sent more data beyond the snd_max. 4929 * We don't mark that as lost and stop here. 4930 */ 4931 break; 4932 } 4933 if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { 4934 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 4935 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 4936 } 4937 if (bbr_marks_rxt_sack_passed) { 4938 /* 4939 * With this option, we will rack out 4940 * in 1ms increments the rest of the packets. 4941 */ 4942 rsm->r_flags |= BBR_SACK_PASSED | BBR_MARKED_LOST; 4943 rsm->r_flags &= ~BBR_WAS_SACKPASS; 4944 } else { 4945 /* 4946 * With this option we only mark them lost 4947 * and remove all sack'd markings. We will run 4948 * another RXT or a TLP. This will cause 4949 * us to eventually send more based on what 4950 * ack's come in. 4951 */ 4952 rsm->r_flags |= BBR_MARKED_LOST; 4953 rsm->r_flags &= ~BBR_WAS_SACKPASS; 4954 rsm->r_flags &= ~BBR_SACK_PASSED; 4955 } 4956 } 4957 trsm = rsm; 4958 } 4959 bbr->r_ctl.rc_resend = TAILQ_FIRST(&bbr->r_ctl.rc_map); 4960 /* Clear the count (we just un-acked them) */ 4961 bbr_log_to_event(bbr, cts, BBR_TO_FRM_TMR); 4962 bbr->rc_tlp_new_data = 0; 4963 bbr->r_ctl.rc_tlp_seg_send_cnt = 0; 4964 /* zap the behindness on a rxt */ 4965 bbr->r_ctl.rc_hptsi_agg_delay = 0; 4966 bbr->r_agg_early_set = 0; 4967 bbr->r_ctl.rc_agg_early = 0; 4968 bbr->rc_tlp_rtx_out = 0; 4969 bbr->r_ctl.rc_sacked = 0; 4970 bbr->r_ctl.rc_sacklast = NULL; 4971 bbr->r_timer_override = 1; 4972 bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); 4973 } 4974 4975 /* 4976 * Re-transmit timeout! If we drop the PCB we will return 1, otherwise 4977 * we will setup to retransmit the lowest seq number outstanding. 4978 */ 4979 static int 4980 bbr_timeout_rxt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 4981 { 4982 int32_t rexmt; 4983 int32_t retval = 0; 4984 bool isipv6; 4985 4986 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT; 4987 if (bbr->rc_all_timers_stopped) { 4988 return (1); 4989 } 4990 if (TCPS_HAVEESTABLISHED(tp->t_state) && 4991 (tp->snd_una == tp->snd_max)) { 4992 /* Nothing outstanding .. nothing to do */ 4993 return (0); 4994 } 4995 /* 4996 * Retransmission timer went off. Message has not been acked within 4997 * retransmit interval. Back off to a longer retransmit interval 4998 * and retransmit one segment. 4999 */ 5000 if (ctf_progress_timeout_check(tp, true)) { 5001 retval = 1; 5002 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 5003 tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); 5004 goto out; 5005 } 5006 bbr_remxt_tmr(tp); 5007 if ((bbr->r_ctl.rc_resend == NULL) || 5008 ((bbr->r_ctl.rc_resend->r_flags & BBR_RWND_COLLAPSED) == 0)) { 5009 /* 5010 * If the rwnd collapsed on 5011 * the one we are retransmitting 5012 * it does not count against the 5013 * rxt count. 5014 */ 5015 tp->t_rxtshift++; 5016 } 5017 if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { 5018 tp->t_rxtshift = TCP_MAXRXTSHIFT; 5019 KMOD_TCPSTAT_INC(tcps_timeoutdrop); 5020 retval = 1; 5021 tcp_log_end_status(tp, TCP_EI_STATUS_RETRAN); 5022 tcp_set_inp_to_drop(bbr->rc_inp, 5023 (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT)); 5024 goto out; 5025 } 5026 if (tp->t_state == TCPS_SYN_SENT) { 5027 /* 5028 * If the SYN was retransmitted, indicate CWND to be limited 5029 * to 1 segment in cc_conn_init(). 5030 */ 5031 tp->snd_cwnd = 1; 5032 } else if (tp->t_rxtshift == 1) { 5033 /* 5034 * first retransmit; record ssthresh and cwnd so they can be 5035 * recovered if this turns out to be a "bad" retransmit. A 5036 * retransmit is considered "bad" if an ACK for this segment 5037 * is received within RTT/2 interval; the assumption here is 5038 * that the ACK was already in flight. See "On Estimating 5039 * End-to-End Network Path Properties" by Allman and Paxson 5040 * for more details. 5041 */ 5042 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5043 if (!IN_RECOVERY(tp->t_flags)) { 5044 tp->snd_cwnd_prev = tp->snd_cwnd; 5045 tp->snd_ssthresh_prev = tp->snd_ssthresh; 5046 tp->snd_recover_prev = tp->snd_recover; 5047 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1)); 5048 tp->t_flags |= TF_PREVVALID; 5049 } else { 5050 tp->t_flags &= ~TF_PREVVALID; 5051 } 5052 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5053 } else { 5054 tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; 5055 tp->t_flags &= ~TF_PREVVALID; 5056 } 5057 KMOD_TCPSTAT_INC(tcps_rexmttimeo); 5058 if ((tp->t_state == TCPS_SYN_SENT) || 5059 (tp->t_state == TCPS_SYN_RECEIVED)) 5060 rexmt = USEC_2_TICKS(BBR_INITIAL_RTO) * tcp_backoff[tp->t_rxtshift]; 5061 else 5062 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; 5063 TCPT_RANGESET(tp->t_rxtcur, rexmt, 5064 MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), 5065 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 5066 /* 5067 * We enter the path for PLMTUD if connection is established or, if 5068 * connection is FIN_WAIT_1 status, reason for the last is that if 5069 * amount of data we send is very small, we could send it in couple 5070 * of packets and process straight to FIN. In that case we won't 5071 * catch ESTABLISHED state. 5072 */ 5073 #ifdef INET6 5074 isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) ? true : false; 5075 #else 5076 isipv6 = false; 5077 #endif 5078 if (((V_tcp_pmtud_blackhole_detect == 1) || 5079 (V_tcp_pmtud_blackhole_detect == 2 && !isipv6) || 5080 (V_tcp_pmtud_blackhole_detect == 3 && isipv6)) && 5081 ((tp->t_state == TCPS_ESTABLISHED) || 5082 (tp->t_state == TCPS_FIN_WAIT_1))) { 5083 /* 5084 * Idea here is that at each stage of mtu probe (usually, 5085 * 1448 -> 1188 -> 524) should be given 2 chances to recover 5086 * before further clamping down. 'tp->t_rxtshift % 2 == 0' 5087 * should take care of that. 5088 */ 5089 if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) == 5090 (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) && 5091 (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 && 5092 tp->t_rxtshift % 2 == 0)) { 5093 /* 5094 * Enter Path MTU Black-hole Detection mechanism: - 5095 * Disable Path MTU Discovery (IP "DF" bit). - 5096 * Reduce MTU to lower value than what we negotiated 5097 * with peer. 5098 */ 5099 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) { 5100 /* 5101 * Record that we may have found a black 5102 * hole. 5103 */ 5104 tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE; 5105 /* Keep track of previous MSS. */ 5106 tp->t_pmtud_saved_maxseg = tp->t_maxseg; 5107 } 5108 /* 5109 * Reduce the MSS to blackhole value or to the 5110 * default in an attempt to retransmit. 5111 */ 5112 #ifdef INET6 5113 isipv6 = bbr->r_is_v6; 5114 if (isipv6 && 5115 tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) { 5116 /* Use the sysctl tuneable blackhole MSS. */ 5117 tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss; 5118 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5119 } else if (isipv6) { 5120 /* Use the default MSS. */ 5121 tp->t_maxseg = V_tcp_v6mssdflt; 5122 /* 5123 * Disable Path MTU Discovery when we switch 5124 * to minmss. 5125 */ 5126 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5127 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5128 } 5129 #endif 5130 #if defined(INET6) && defined(INET) 5131 else 5132 #endif 5133 #ifdef INET 5134 if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) { 5135 /* Use the sysctl tuneable blackhole MSS. */ 5136 tp->t_maxseg = V_tcp_pmtud_blackhole_mss; 5137 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated); 5138 } else { 5139 /* Use the default MSS. */ 5140 tp->t_maxseg = V_tcp_mssdflt; 5141 /* 5142 * Disable Path MTU Discovery when we switch 5143 * to minmss. 5144 */ 5145 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 5146 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); 5147 } 5148 #endif 5149 } else { 5150 /* 5151 * If further retransmissions are still unsuccessful 5152 * with a lowered MTU, maybe this isn't a blackhole 5153 * and we restore the previous MSS and blackhole 5154 * detection flags. The limit '6' is determined by 5155 * giving each probe stage (1448, 1188, 524) 2 5156 * chances to recover. 5157 */ 5158 if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) && 5159 (tp->t_rxtshift >= 6)) { 5160 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 5161 tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE; 5162 tp->t_maxseg = tp->t_pmtud_saved_maxseg; 5163 KMOD_TCPSTAT_INC(tcps_pmtud_blackhole_failed); 5164 } 5165 } 5166 } 5167 /* 5168 * Disable RFC1323 and SACK if we haven't got any response to our 5169 * third SYN to work-around some broken terminal servers (most of 5170 * which have hopefully been retired) that have bad VJ header 5171 * compression code which trashes TCP segments containing 5172 * unknown-to-them TCP options. 5173 */ 5174 if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && 5175 (tp->t_rxtshift == 3)) 5176 tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT); 5177 /* 5178 * If we backed off this far, our srtt estimate is probably bogus. 5179 * Clobber it so we'll take the next rtt measurement as our srtt; 5180 * move the current srtt into rttvar to keep the current retransmit 5181 * times until then. 5182 */ 5183 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) { 5184 #ifdef INET6 5185 if (bbr->r_is_v6) 5186 in6_losing(tp->t_inpcb); 5187 else 5188 #endif 5189 in_losing(tp->t_inpcb); 5190 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT); 5191 tp->t_srtt = 0; 5192 } 5193 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 5194 tp->snd_recover = tp->snd_max; 5195 tp->t_flags |= TF_ACKNOW; 5196 tp->t_rtttime = 0; 5197 out: 5198 return (retval); 5199 } 5200 5201 static int 5202 bbr_process_timers(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, uint8_t hpts_calling) 5203 { 5204 int32_t ret = 0; 5205 int32_t timers = (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK); 5206 5207 if (timers == 0) { 5208 return (0); 5209 } 5210 if (tp->t_state == TCPS_LISTEN) { 5211 /* no timers on listen sockets */ 5212 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) 5213 return (0); 5214 return (1); 5215 } 5216 if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { 5217 uint32_t left; 5218 5219 if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) { 5220 ret = -1; 5221 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5222 return (0); 5223 } 5224 if (hpts_calling == 0) { 5225 ret = -2; 5226 bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); 5227 return (0); 5228 } 5229 /* 5230 * Ok our timer went off early and we are not paced false 5231 * alarm, go back to sleep. 5232 */ 5233 left = bbr->r_ctl.rc_timer_exp - cts; 5234 ret = -3; 5235 bbr_log_to_processing(bbr, cts, ret, left, hpts_calling); 5236 tcp_hpts_insert(tp->t_inpcb, HPTS_USEC_TO_SLOTS(left)); 5237 return (1); 5238 } 5239 bbr->rc_tmr_stopped = 0; 5240 bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK; 5241 if (timers & PACE_TMR_DELACK) { 5242 ret = bbr_timeout_delack(tp, bbr, cts); 5243 } else if (timers & PACE_TMR_PERSIT) { 5244 ret = bbr_timeout_persist(tp, bbr, cts); 5245 } else if (timers & PACE_TMR_RACK) { 5246 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5247 ret = bbr_timeout_rack(tp, bbr, cts); 5248 } else if (timers & PACE_TMR_TLP) { 5249 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5250 ret = bbr_timeout_tlp(tp, bbr, cts); 5251 } else if (timers & PACE_TMR_RXT) { 5252 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 5253 ret = bbr_timeout_rxt(tp, bbr, cts); 5254 } else if (timers & PACE_TMR_KEEP) { 5255 ret = bbr_timeout_keepalive(tp, bbr, cts); 5256 } 5257 bbr_log_to_processing(bbr, cts, ret, timers, hpts_calling); 5258 return (ret); 5259 } 5260 5261 static void 5262 bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts) 5263 { 5264 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 5265 uint8_t hpts_removed = 0; 5266 5267 if (bbr->rc_inp->inp_in_hpts && 5268 (bbr->rc_timer_first == 1)) { 5269 /* 5270 * If we are canceling timer's when we have the 5271 * timer ahead of the output being paced. We also 5272 * must remove ourselves from the hpts. 5273 */ 5274 hpts_removed = 1; 5275 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 5276 if (bbr->r_ctl.rc_last_delay_val) { 5277 /* Update the last hptsi delay too */ 5278 uint32_t time_since_send; 5279 5280 if (TSTMP_GT(cts, bbr->rc_pacer_started)) 5281 time_since_send = cts - bbr->rc_pacer_started; 5282 else 5283 time_since_send = 0; 5284 if (bbr->r_ctl.rc_last_delay_val > time_since_send) { 5285 /* Cut down our slot time */ 5286 bbr->r_ctl.rc_last_delay_val -= time_since_send; 5287 } else { 5288 bbr->r_ctl.rc_last_delay_val = 0; 5289 } 5290 bbr->rc_pacer_started = cts; 5291 } 5292 } 5293 bbr->rc_timer_first = 0; 5294 bbr_log_to_cancel(bbr, line, cts, hpts_removed); 5295 bbr->rc_tmr_stopped = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; 5296 bbr->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK); 5297 } 5298 } 5299 5300 static void 5301 bbr_timer_stop(struct tcpcb *tp, uint32_t timer_type) 5302 { 5303 struct tcp_bbr *bbr; 5304 5305 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 5306 bbr->rc_all_timers_stopped = 1; 5307 return; 5308 } 5309 5310 /* 5311 * stop all timers always returning 0. 5312 */ 5313 static int 5314 bbr_stopall(struct tcpcb *tp) 5315 { 5316 return (0); 5317 } 5318 5319 static void 5320 bbr_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta) 5321 { 5322 return; 5323 } 5324 5325 /* 5326 * return true if a bbr timer (rack or tlp) is active. 5327 */ 5328 static int 5329 bbr_timer_active(struct tcpcb *tp, uint32_t timer_type) 5330 { 5331 return (0); 5332 } 5333 5334 static uint32_t 5335 bbr_get_earliest_send_outstanding(struct tcp_bbr *bbr, struct bbr_sendmap *u_rsm, uint32_t cts) 5336 { 5337 struct bbr_sendmap *rsm; 5338 5339 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 5340 if ((rsm == NULL) || (u_rsm == rsm)) 5341 return (cts); 5342 return(rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]); 5343 } 5344 5345 static void 5346 bbr_update_rsm(struct tcpcb *tp, struct tcp_bbr *bbr, 5347 struct bbr_sendmap *rsm, uint32_t cts, uint32_t pacing_time) 5348 { 5349 int32_t idx; 5350 5351 rsm->r_rtr_cnt++; 5352 rsm->r_dupack = 0; 5353 if (rsm->r_rtr_cnt > BBR_NUM_OF_RETRANS) { 5354 rsm->r_rtr_cnt = BBR_NUM_OF_RETRANS; 5355 rsm->r_flags |= BBR_OVERMAX; 5356 } 5357 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 5358 /* Take off the collapsed flag at rxt */ 5359 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 5360 } 5361 if (rsm->r_flags & BBR_MARKED_LOST) { 5362 /* We have retransmitted, its no longer lost */ 5363 rsm->r_flags &= ~BBR_MARKED_LOST; 5364 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 5365 } 5366 if (rsm->r_flags & BBR_RXT_CLEARED) { 5367 /* 5368 * We hit a RXT timer on it and 5369 * we cleared the "acked" flag. 5370 * We now have it going back into 5371 * flight, we can remove the cleared 5372 * flag and possibly do accounting on 5373 * this piece. 5374 */ 5375 rsm->r_flags &= ~BBR_RXT_CLEARED; 5376 } 5377 if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & BBR_TLP) == 0)) { 5378 bbr->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start); 5379 rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start); 5380 } 5381 idx = rsm->r_rtr_cnt - 1; 5382 rsm->r_tim_lastsent[idx] = cts; 5383 rsm->r_pacing_delay = pacing_time; 5384 rsm->r_delivered = bbr->r_ctl.rc_delivered; 5385 rsm->r_ts_valid = bbr->rc_ts_valid; 5386 if (bbr->rc_ts_valid) 5387 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 5388 if (bbr->r_ctl.r_app_limited_until) 5389 rsm->r_app_limited = 1; 5390 else 5391 rsm->r_app_limited = 0; 5392 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 5393 rsm->r_bbr_state = bbr_state_val(bbr); 5394 else 5395 rsm->r_bbr_state = 8; 5396 if (rsm->r_flags & BBR_ACKED) { 5397 /* Problably MTU discovery messing with us */ 5398 uint32_t old_flags; 5399 5400 old_flags = rsm->r_flags; 5401 rsm->r_flags &= ~BBR_ACKED; 5402 bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); 5403 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 5404 if (bbr->r_ctl.rc_sacked == 0) 5405 bbr->r_ctl.rc_sacklast = NULL; 5406 } 5407 if (rsm->r_in_tmap) { 5408 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5409 } 5410 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 5411 rsm->r_in_tmap = 1; 5412 if (rsm->r_flags & BBR_SACK_PASSED) { 5413 /* We have retransmitted due to the SACK pass */ 5414 rsm->r_flags &= ~BBR_SACK_PASSED; 5415 rsm->r_flags |= BBR_WAS_SACKPASS; 5416 } 5417 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 5418 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 5419 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 5420 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 5421 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 5422 rsm->r_is_gain = 1; 5423 rsm->r_is_drain = 0; 5424 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 5425 rsm->r_is_drain = 1; 5426 rsm->r_is_gain = 0; 5427 } else { 5428 rsm->r_is_drain = 0; 5429 rsm->r_is_gain = 0; 5430 } 5431 rsm->r_del_time = bbr->r_ctl.rc_del_time; /* TEMP GOOGLE CODE */ 5432 } 5433 5434 /* 5435 * Returns 0, or the sequence where we stopped 5436 * updating. We also update the lenp to be the amount 5437 * of data left. 5438 */ 5439 5440 static uint32_t 5441 bbr_update_entry(struct tcpcb *tp, struct tcp_bbr *bbr, 5442 struct bbr_sendmap *rsm, uint32_t cts, int32_t *lenp, uint32_t pacing_time) 5443 { 5444 /* 5445 * We (re-)transmitted starting at rsm->r_start for some length 5446 * (possibly less than r_end. 5447 */ 5448 struct bbr_sendmap *nrsm; 5449 uint32_t c_end; 5450 int32_t len; 5451 5452 len = *lenp; 5453 c_end = rsm->r_start + len; 5454 if (SEQ_GEQ(c_end, rsm->r_end)) { 5455 /* 5456 * We retransmitted the whole piece or more than the whole 5457 * slopping into the next rsm. 5458 */ 5459 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5460 if (c_end == rsm->r_end) { 5461 *lenp = 0; 5462 return (0); 5463 } else { 5464 int32_t act_len; 5465 5466 /* Hangs over the end return whats left */ 5467 act_len = rsm->r_end - rsm->r_start; 5468 *lenp = (len - act_len); 5469 return (rsm->r_end); 5470 } 5471 /* We don't get out of this block. */ 5472 } 5473 /* 5474 * Here we retransmitted less than the whole thing which means we 5475 * have to split this into what was transmitted and what was not. 5476 */ 5477 nrsm = bbr_alloc_full_limit(bbr); 5478 if (nrsm == NULL) { 5479 *lenp = 0; 5480 return (0); 5481 } 5482 /* 5483 * So here we are going to take the original rsm and make it what we 5484 * retransmitted. nrsm will be the tail portion we did not 5485 * retransmit. For example say the chunk was 1, 11 (10 bytes). And 5486 * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to 5487 * 1, 6 and the new piece will be 6, 11. 5488 */ 5489 bbr_clone_rsm(bbr, nrsm, rsm, c_end); 5490 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 5491 nrsm->r_dupack = 0; 5492 if (rsm->r_in_tmap) { 5493 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 5494 nrsm->r_in_tmap = 1; 5495 } 5496 rsm->r_flags &= (~BBR_HAS_FIN); 5497 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 5498 *lenp = 0; 5499 return (0); 5500 } 5501 5502 static uint64_t 5503 bbr_get_hardware_rate(struct tcp_bbr *bbr) 5504 { 5505 uint64_t bw; 5506 5507 bw = bbr_get_bw(bbr); 5508 bw *= (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]; 5509 bw /= (uint64_t)BBR_UNIT; 5510 return(bw); 5511 } 5512 5513 static void 5514 bbr_setup_less_of_rate(struct tcp_bbr *bbr, uint32_t cts, 5515 uint64_t act_rate, uint64_t rate_wanted) 5516 { 5517 /* 5518 * We could not get a full gains worth 5519 * of rate. 5520 */ 5521 if (get_filter_value(&bbr->r_ctl.rc_delrate) >= act_rate) { 5522 /* we can't even get the real rate */ 5523 uint64_t red; 5524 5525 bbr->skip_gain = 1; 5526 bbr->gain_is_limited = 0; 5527 red = get_filter_value(&bbr->r_ctl.rc_delrate) - act_rate; 5528 if (red) 5529 filter_reduce_by(&bbr->r_ctl.rc_delrate, red, cts); 5530 } else { 5531 /* We can use a lower gain */ 5532 bbr->skip_gain = 0; 5533 bbr->gain_is_limited = 1; 5534 } 5535 } 5536 5537 static void 5538 bbr_update_hardware_pacing_rate(struct tcp_bbr *bbr, uint32_t cts) 5539 { 5540 const struct tcp_hwrate_limit_table *nrte; 5541 int error, rate = -1; 5542 5543 if (bbr->r_ctl.crte == NULL) 5544 return; 5545 if ((bbr->rc_inp->inp_route.ro_nh == NULL) || 5546 (bbr->rc_inp->inp_route.ro_nh->nh_ifp == NULL)) { 5547 /* Lost our routes? */ 5548 /* Clear the way for a re-attempt */ 5549 bbr->bbr_attempt_hdwr_pace = 0; 5550 lost_rate: 5551 bbr->gain_is_limited = 0; 5552 bbr->skip_gain = 0; 5553 bbr->bbr_hdrw_pacing = 0; 5554 counter_u64_add(bbr_flows_whdwr_pacing, -1); 5555 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 5556 tcp_bbr_tso_size_check(bbr, cts); 5557 return; 5558 } 5559 rate = bbr_get_hardware_rate(bbr); 5560 nrte = tcp_chg_pacing_rate(bbr->r_ctl.crte, 5561 bbr->rc_tp, 5562 bbr->rc_inp->inp_route.ro_nh->nh_ifp, 5563 rate, 5564 (RS_PACING_GEQ|RS_PACING_SUB_OK), 5565 &error, NULL); 5566 if (nrte == NULL) { 5567 goto lost_rate; 5568 } 5569 if (nrte != bbr->r_ctl.crte) { 5570 bbr->r_ctl.crte = nrte; 5571 if (error == 0) { 5572 BBR_STAT_INC(bbr_hdwr_rl_mod_ok); 5573 if (bbr->r_ctl.crte->rate < rate) { 5574 /* We have a problem */ 5575 bbr_setup_less_of_rate(bbr, cts, 5576 bbr->r_ctl.crte->rate, rate); 5577 } else { 5578 /* We are good */ 5579 bbr->gain_is_limited = 0; 5580 bbr->skip_gain = 0; 5581 } 5582 } else { 5583 /* A failure should release the tag */ 5584 BBR_STAT_INC(bbr_hdwr_rl_mod_fail); 5585 bbr->gain_is_limited = 0; 5586 bbr->skip_gain = 0; 5587 bbr->bbr_hdrw_pacing = 0; 5588 } 5589 bbr_type_log_hdwr_pacing(bbr, 5590 bbr->r_ctl.crte->ptbl->rs_ifp, 5591 rate, 5592 ((bbr->r_ctl.crte == NULL) ? 0 : bbr->r_ctl.crte->rate), 5593 __LINE__, 5594 cts, 5595 error); 5596 } 5597 } 5598 5599 static void 5600 bbr_adjust_for_hw_pacing(struct tcp_bbr *bbr, uint32_t cts) 5601 { 5602 /* 5603 * If we have hardware pacing support 5604 * we need to factor that in for our 5605 * TSO size. 5606 */ 5607 const struct tcp_hwrate_limit_table *rlp; 5608 uint32_t cur_delay, seg_sz, maxseg, new_tso, delta, hdwr_delay; 5609 5610 if ((bbr->bbr_hdrw_pacing == 0) || 5611 (IN_RECOVERY(bbr->rc_tp->t_flags)) || 5612 (bbr->r_ctl.crte == NULL)) 5613 return; 5614 if (bbr->hw_pacing_set == 0) { 5615 /* Not yet by the hdwr pacing count delay */ 5616 return; 5617 } 5618 if (bbr_hdwr_pace_adjust == 0) { 5619 /* No adjustment */ 5620 return; 5621 } 5622 rlp = bbr->r_ctl.crte; 5623 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) 5624 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5625 else 5626 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5627 /* 5628 * So lets first get the 5629 * time we will take between 5630 * TSO sized sends currently without 5631 * hardware help. 5632 */ 5633 cur_delay = bbr_get_pacing_delay(bbr, BBR_UNIT, 5634 bbr->r_ctl.rc_pace_max_segs, cts, 1); 5635 hdwr_delay = bbr->r_ctl.rc_pace_max_segs / maxseg; 5636 hdwr_delay *= rlp->time_between; 5637 if (cur_delay > hdwr_delay) 5638 delta = cur_delay - hdwr_delay; 5639 else 5640 delta = 0; 5641 bbr_log_type_tsosize(bbr, cts, delta, cur_delay, hdwr_delay, 5642 (bbr->r_ctl.rc_pace_max_segs / maxseg), 5643 1); 5644 if (delta && 5645 (delta < (max(rlp->time_between, 5646 bbr->r_ctl.bbr_hptsi_segments_delay_tar)))) { 5647 /* 5648 * Now lets divide by the pacing 5649 * time between each segment the 5650 * hardware sends rounding up and 5651 * derive a bytes from that. We multiply 5652 * that by bbr_hdwr_pace_adjust to get 5653 * more bang for our buck. 5654 * 5655 * The goal is to have the software pacer 5656 * waiting no more than an additional 5657 * pacing delay if we can (without the 5658 * compensation i.e. x bbr_hdwr_pace_adjust). 5659 */ 5660 seg_sz = max(((cur_delay + rlp->time_between)/rlp->time_between), 5661 (bbr->r_ctl.rc_pace_max_segs/maxseg)); 5662 seg_sz *= bbr_hdwr_pace_adjust; 5663 if (bbr_hdwr_pace_floor && 5664 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5665 /* Currently hardware paces 5666 * out rs_min_seg segments at a time. 5667 * We need to make sure we always send at least 5668 * a full burst of bbr_hdwr_pace_floor down. 5669 */ 5670 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5671 } 5672 seg_sz *= maxseg; 5673 } else if (delta == 0) { 5674 /* 5675 * The highest pacing rate is 5676 * above our b/w gained. This means 5677 * we probably are going quite fast at 5678 * the hardware highest rate. Lets just multiply 5679 * the calculated TSO size by the 5680 * multiplier factor (its probably 5681 * 4 segments in the default config for 5682 * mlx). 5683 */ 5684 seg_sz = bbr->r_ctl.rc_pace_max_segs * bbr_hdwr_pace_adjust; 5685 if (bbr_hdwr_pace_floor && 5686 (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { 5687 /* Currently hardware paces 5688 * out rs_min_seg segments at a time. 5689 * We need to make sure we always send at least 5690 * a full burst of bbr_hdwr_pace_floor down. 5691 */ 5692 seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; 5693 } 5694 } else { 5695 /* 5696 * The pacing time difference is so 5697 * big that the hardware will 5698 * pace out more rapidly then we 5699 * really want and then we 5700 * will have a long delay. Lets just keep 5701 * the same TSO size so its as if 5702 * we were not using hdwr pacing (we 5703 * just gain a bit of spacing from the 5704 * hardware if seg_sz > 1). 5705 */ 5706 seg_sz = bbr->r_ctl.rc_pace_max_segs; 5707 } 5708 if (seg_sz > bbr->r_ctl.rc_pace_max_segs) 5709 new_tso = seg_sz; 5710 else 5711 new_tso = bbr->r_ctl.rc_pace_max_segs; 5712 if (new_tso >= (PACE_MAX_IP_BYTES-maxseg)) 5713 new_tso = PACE_MAX_IP_BYTES - maxseg; 5714 5715 if (new_tso != bbr->r_ctl.rc_pace_max_segs) { 5716 bbr_log_type_tsosize(bbr, cts, new_tso, 0, bbr->r_ctl.rc_pace_max_segs, maxseg, 0); 5717 bbr->r_ctl.rc_pace_max_segs = new_tso; 5718 } 5719 } 5720 5721 static void 5722 tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts) 5723 { 5724 uint64_t bw; 5725 uint32_t old_tso = 0, new_tso; 5726 uint32_t maxseg, bytes; 5727 uint32_t tls_seg=0; 5728 /* 5729 * Google/linux uses the following algorithm to determine 5730 * the TSO size based on the b/w of the link (from Neal Cardwell email 9/27/18): 5731 * 5732 * bytes = bw_in_bytes_per_second / 1000 5733 * bytes = min(bytes, 64k) 5734 * tso_segs = bytes / MSS 5735 * if (bw < 1.2Mbs) 5736 * min_tso_segs = 1 5737 * else 5738 * min_tso_segs = 2 5739 * tso_segs = max(tso_segs, min_tso_segs) 5740 * 5741 * * Note apply a device specific limit (we apply this in the 5742 * tcp_m_copym). 5743 * Note that before the initial measurement is made google bursts out 5744 * a full iwnd just like new-reno/cubic. 5745 * 5746 * We do not use this algorithm. Instead we 5747 * use a two phased approach: 5748 * 5749 * if ( bw <= per-tcb-cross-over) 5750 * goal_tso = calculate how much with this bw we 5751 * can send in goal-time seconds. 5752 * if (goal_tso > mss) 5753 * seg = goal_tso / mss 5754 * tso = seg * mss 5755 * else 5756 * tso = mss 5757 * if (tso > per-tcb-max) 5758 * tso = per-tcb-max 5759 * else if ( bw > 512Mbps) 5760 * tso = max-tso (64k/mss) 5761 * else 5762 * goal_tso = bw / per-tcb-divsor 5763 * seg = (goal_tso + mss-1)/mss 5764 * tso = seg * mss 5765 * 5766 * if (tso < per-tcb-floor) 5767 * tso = per-tcb-floor 5768 * if (tso > per-tcb-utter_max) 5769 * tso = per-tcb-utter_max 5770 * 5771 * Note the default per-tcb-divisor is 1000 (same as google). 5772 * the goal cross over is 30Mbps however. To recreate googles 5773 * algorithm you need to set: 5774 * 5775 * cross-over = 23,168,000 bps 5776 * goal-time = 18000 5777 * per-tcb-max = 2 5778 * per-tcb-divisor = 1000 5779 * per-tcb-floor = 1 5780 * 5781 * This will get you "google bbr" behavior with respect to tso size. 5782 * 5783 * Note we do set anything TSO size until we are past the initial 5784 * window. Before that we gnerally use either a single MSS 5785 * or we use the full IW size (so we burst a IW at a time) 5786 */ 5787 5788 if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) { 5789 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5790 } else { 5791 maxseg = BBR_MIN_SEG - bbr->rc_last_options; 5792 } 5793 old_tso = bbr->r_ctl.rc_pace_max_segs; 5794 if (bbr->rc_past_init_win == 0) { 5795 /* 5796 * Not enough data has been acknowledged to make a 5797 * judgement. Set up the initial TSO based on if we 5798 * are sending a full IW at once or not. 5799 */ 5800 if (bbr->rc_use_google) 5801 bbr->r_ctl.rc_pace_max_segs = ((bbr->rc_tp->t_maxseg - bbr->rc_last_options) * 2); 5802 else if (bbr->bbr_init_win_cheat) 5803 bbr->r_ctl.rc_pace_max_segs = bbr_initial_cwnd(bbr, bbr->rc_tp); 5804 else 5805 bbr->r_ctl.rc_pace_max_segs = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 5806 if (bbr->r_ctl.rc_pace_min_segs != bbr->rc_tp->t_maxseg) 5807 bbr->r_ctl.rc_pace_min_segs = bbr->rc_tp->t_maxseg; 5808 if (bbr->r_ctl.rc_pace_max_segs == 0) { 5809 bbr->r_ctl.rc_pace_max_segs = maxseg; 5810 } 5811 bbr_log_type_tsosize(bbr, cts, bbr->r_ctl.rc_pace_max_segs, tls_seg, old_tso, maxseg, 0); 5812 bbr_adjust_for_hw_pacing(bbr, cts); 5813 return; 5814 } 5815 /** 5816 * Now lets set the TSO goal based on our delivery rate in 5817 * bytes per second. Note we only do this if 5818 * we have acked at least the initial cwnd worth of data. 5819 */ 5820 bw = bbr_get_bw(bbr); 5821 if (IN_RECOVERY(bbr->rc_tp->t_flags) && 5822 (bbr->rc_use_google == 0)) { 5823 /* We clamp to one MSS in recovery */ 5824 new_tso = maxseg; 5825 } else if (bbr->rc_use_google) { 5826 int min_tso_segs; 5827 5828 /* Google considers the gain too */ 5829 if (bbr->r_ctl.rc_bbr_hptsi_gain != BBR_UNIT) { 5830 bw *= bbr->r_ctl.rc_bbr_hptsi_gain; 5831 bw /= BBR_UNIT; 5832 } 5833 bytes = bw / 1024; 5834 if (bytes > (64 * 1024)) 5835 bytes = 64 * 1024; 5836 new_tso = bytes / maxseg; 5837 if (bw < ONE_POINT_TWO_MEG) 5838 min_tso_segs = 1; 5839 else 5840 min_tso_segs = 2; 5841 if (new_tso < min_tso_segs) 5842 new_tso = min_tso_segs; 5843 new_tso *= maxseg; 5844 } else if (bbr->rc_no_pacing) { 5845 new_tso = (PACE_MAX_IP_BYTES / maxseg) * maxseg; 5846 } else if (bw <= bbr->r_ctl.bbr_cross_over) { 5847 /* 5848 * Calculate the worse case b/w TSO if we are inserting no 5849 * more than a delay_target number of TSO's. 5850 */ 5851 uint32_t tso_len, min_tso; 5852 5853 tso_len = bbr_get_pacing_length(bbr, BBR_UNIT, bbr->r_ctl.bbr_hptsi_segments_delay_tar, bw); 5854 if (tso_len > maxseg) { 5855 new_tso = tso_len / maxseg; 5856 if (new_tso > bbr->r_ctl.bbr_hptsi_segments_max) 5857 new_tso = bbr->r_ctl.bbr_hptsi_segments_max; 5858 new_tso *= maxseg; 5859 } else { 5860 /* 5861 * less than a full sized frame yikes.. long rtt or 5862 * low bw? 5863 */ 5864 min_tso = bbr_minseg(bbr); 5865 if ((tso_len > min_tso) && (bbr_all_get_min == 0)) 5866 new_tso = rounddown(tso_len, min_tso); 5867 else 5868 new_tso = min_tso; 5869 } 5870 } else if (bw > FIVETWELVE_MBPS) { 5871 /* 5872 * This guy is so fast b/w wise that we can TSO as large as 5873 * possible of segments that the NIC will allow. 5874 */ 5875 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5876 } else { 5877 /* 5878 * This formula is based on attempting to send a segment or 5879 * more every bbr_hptsi_per_second. The default is 1000 5880 * which means you are targeting what you can send every 1ms 5881 * based on the peers bw. 5882 * 5883 * If the number drops to say 500, then you are looking more 5884 * at 2ms and you will raise how much we send in a single 5885 * TSO thus saving CPU (less bbr_output_wtime() calls). The 5886 * trade off of course is you will send more at once and 5887 * thus tend to clump up the sends into larger "bursts" 5888 * building a queue. 5889 */ 5890 bw /= bbr->r_ctl.bbr_hptsi_per_second; 5891 new_tso = roundup(bw, (uint64_t)maxseg); 5892 /* 5893 * Gate the floor to match what our lower than 48Mbps 5894 * algorithm does. The ceiling (bbr_hptsi_segments_max) thus 5895 * becomes the floor for this calculation. 5896 */ 5897 if (new_tso < (bbr->r_ctl.bbr_hptsi_segments_max * maxseg)) 5898 new_tso = (bbr->r_ctl.bbr_hptsi_segments_max * maxseg); 5899 } 5900 if (bbr->r_ctl.bbr_hptsi_segments_floor && (new_tso < (maxseg * bbr->r_ctl.bbr_hptsi_segments_floor))) 5901 new_tso = maxseg * bbr->r_ctl.bbr_hptsi_segments_floor; 5902 if (new_tso > PACE_MAX_IP_BYTES) 5903 new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); 5904 /* Enforce an utter maximum. */ 5905 if (bbr->r_ctl.bbr_utter_max && (new_tso > (bbr->r_ctl.bbr_utter_max * maxseg))) { 5906 new_tso = bbr->r_ctl.bbr_utter_max * maxseg; 5907 } 5908 if (old_tso != new_tso) { 5909 /* Only log changes */ 5910 bbr_log_type_tsosize(bbr, cts, new_tso, tls_seg, old_tso, maxseg, 0); 5911 bbr->r_ctl.rc_pace_max_segs = new_tso; 5912 } 5913 /* We have hardware pacing! */ 5914 bbr_adjust_for_hw_pacing(bbr, cts); 5915 } 5916 5917 static void 5918 bbr_log_output(struct tcp_bbr *bbr, struct tcpcb *tp, struct tcpopt *to, int32_t len, 5919 uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t cts, 5920 struct mbuf *mb, int32_t * abandon, struct bbr_sendmap *hintrsm, uint32_t delay_calc, 5921 struct sockbuf *sb) 5922 { 5923 5924 struct bbr_sendmap *rsm, *nrsm; 5925 register uint32_t snd_max, snd_una; 5926 uint32_t pacing_time; 5927 /* 5928 * Add to the RACK log of packets in flight or retransmitted. If 5929 * there is a TS option we will use the TS echoed, if not we will 5930 * grab a TS. 5931 * 5932 * Retransmissions will increment the count and move the ts to its 5933 * proper place. Note that if options do not include TS's then we 5934 * won't be able to effectively use the ACK for an RTT on a retran. 5935 * 5936 * Notes about r_start and r_end. Lets consider a send starting at 5937 * sequence 1 for 10 bytes. In such an example the r_start would be 5938 * 1 (starting sequence) but the r_end would be r_start+len i.e. 11. 5939 * This means that r_end is actually the first sequence for the next 5940 * slot (11). 5941 * 5942 */ 5943 INP_WLOCK_ASSERT(tp->t_inpcb); 5944 if (err) { 5945 /* 5946 * We don't log errors -- we could but snd_max does not 5947 * advance in this case either. 5948 */ 5949 return; 5950 } 5951 if (th_flags & TH_RST) { 5952 /* 5953 * We don't log resets and we return immediately from 5954 * sending 5955 */ 5956 *abandon = 1; 5957 return; 5958 } 5959 snd_una = tp->snd_una; 5960 if (th_flags & (TH_SYN | TH_FIN) && (hintrsm == NULL)) { 5961 /* 5962 * The call to bbr_log_output is made before bumping 5963 * snd_max. This means we can record one extra byte on a SYN 5964 * or FIN if seq_out is adding more on and a FIN is present 5965 * (and we are not resending). 5966 */ 5967 if ((th_flags & TH_SYN) && (tp->iss == seq_out)) 5968 len++; 5969 if (th_flags & TH_FIN) 5970 len++; 5971 } 5972 if (SEQ_LEQ((seq_out + len), snd_una)) { 5973 /* Are sending an old segment to induce an ack (keep-alive)? */ 5974 return; 5975 } 5976 if (SEQ_LT(seq_out, snd_una)) { 5977 /* huh? should we panic? */ 5978 uint32_t end; 5979 5980 end = seq_out + len; 5981 seq_out = snd_una; 5982 len = end - seq_out; 5983 } 5984 snd_max = tp->snd_max; 5985 if (len == 0) { 5986 /* We don't log zero window probes */ 5987 return; 5988 } 5989 pacing_time = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, len, cts, 1); 5990 /* First question is it a retransmission? */ 5991 if (seq_out == snd_max) { 5992 again: 5993 rsm = bbr_alloc(bbr); 5994 if (rsm == NULL) { 5995 return; 5996 } 5997 rsm->r_flags = 0; 5998 if (th_flags & TH_SYN) 5999 rsm->r_flags |= BBR_HAS_SYN; 6000 if (th_flags & TH_FIN) 6001 rsm->r_flags |= BBR_HAS_FIN; 6002 rsm->r_tim_lastsent[0] = cts; 6003 rsm->r_rtr_cnt = 1; 6004 rsm->r_rtr_bytes = 0; 6005 rsm->r_start = seq_out; 6006 rsm->r_end = rsm->r_start + len; 6007 rsm->r_dupack = 0; 6008 rsm->r_delivered = bbr->r_ctl.rc_delivered; 6009 rsm->r_pacing_delay = pacing_time; 6010 rsm->r_ts_valid = bbr->rc_ts_valid; 6011 if (bbr->rc_ts_valid) 6012 rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; 6013 rsm->r_del_time = bbr->r_ctl.rc_del_time; 6014 if (bbr->r_ctl.r_app_limited_until) 6015 rsm->r_app_limited = 1; 6016 else 6017 rsm->r_app_limited = 0; 6018 rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); 6019 rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, 6020 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 6021 /* 6022 * Here we must also add in this rsm since snd_max 6023 * is updated after we return from a new send. 6024 */ 6025 rsm->r_flight_at_send += len; 6026 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 6027 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 6028 rsm->r_in_tmap = 1; 6029 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 6030 rsm->r_bbr_state = bbr_state_val(bbr); 6031 else 6032 rsm->r_bbr_state = 8; 6033 if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { 6034 rsm->r_is_gain = 1; 6035 rsm->r_is_drain = 0; 6036 } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { 6037 rsm->r_is_drain = 1; 6038 rsm->r_is_gain = 0; 6039 } else { 6040 rsm->r_is_drain = 0; 6041 rsm->r_is_gain = 0; 6042 } 6043 return; 6044 } 6045 /* 6046 * If we reach here its a retransmission and we need to find it. 6047 */ 6048 more: 6049 if (hintrsm && (hintrsm->r_start == seq_out)) { 6050 rsm = hintrsm; 6051 hintrsm = NULL; 6052 } else if (bbr->r_ctl.rc_next) { 6053 /* We have a hint from a previous run */ 6054 rsm = bbr->r_ctl.rc_next; 6055 } else { 6056 /* No hints sorry */ 6057 rsm = NULL; 6058 } 6059 if ((rsm) && (rsm->r_start == seq_out)) { 6060 /* 6061 * We used rc_next or hintrsm to retransmit, hopefully the 6062 * likely case. 6063 */ 6064 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6065 if (len == 0) { 6066 return; 6067 } else { 6068 goto more; 6069 } 6070 } 6071 /* Ok it was not the last pointer go through it the hard way. */ 6072 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6073 if (rsm->r_start == seq_out) { 6074 seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); 6075 bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); 6076 if (len == 0) { 6077 return; 6078 } else { 6079 continue; 6080 } 6081 } 6082 if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) { 6083 /* Transmitted within this piece */ 6084 /* 6085 * Ok we must split off the front and then let the 6086 * update do the rest 6087 */ 6088 nrsm = bbr_alloc_full_limit(bbr); 6089 if (nrsm == NULL) { 6090 bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); 6091 return; 6092 } 6093 /* 6094 * copy rsm to nrsm and then trim the front of rsm 6095 * to not include this part. 6096 */ 6097 bbr_clone_rsm(bbr, nrsm, rsm, seq_out); 6098 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 6099 if (rsm->r_in_tmap) { 6100 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 6101 nrsm->r_in_tmap = 1; 6102 } 6103 rsm->r_flags &= (~BBR_HAS_FIN); 6104 seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time); 6105 if (len == 0) { 6106 return; 6107 } 6108 } 6109 } 6110 /* 6111 * Hmm not found in map did they retransmit both old and on into the 6112 * new? 6113 */ 6114 if (seq_out == tp->snd_max) { 6115 goto again; 6116 } else if (SEQ_LT(seq_out, tp->snd_max)) { 6117 #ifdef BBR_INVARIANTS 6118 printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n", 6119 seq_out, len, tp->snd_una, tp->snd_max); 6120 printf("Starting Dump of all rack entries\n"); 6121 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 6122 printf("rsm:%p start:%u end:%u\n", 6123 rsm, rsm->r_start, rsm->r_end); 6124 } 6125 printf("Dump complete\n"); 6126 panic("seq_out not found rack:%p tp:%p", 6127 bbr, tp); 6128 #endif 6129 } else { 6130 #ifdef BBR_INVARIANTS 6131 /* 6132 * Hmm beyond sndmax? (only if we are using the new rtt-pack 6133 * flag) 6134 */ 6135 panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p", 6136 seq_out, len, tp->snd_max, tp); 6137 #endif 6138 } 6139 } 6140 6141 static void 6142 bbr_collapse_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, int32_t rtt) 6143 { 6144 /* 6145 * Collapse timeout back the cum-ack moved. 6146 */ 6147 tp->t_rxtshift = 0; 6148 tp->t_softerror = 0; 6149 } 6150 6151 static void 6152 tcp_bbr_xmit_timer(struct tcp_bbr *bbr, uint32_t rtt_usecs, uint32_t rsm_send_time, uint32_t r_start, uint32_t tsin) 6153 { 6154 bbr->rtt_valid = 1; 6155 bbr->r_ctl.cur_rtt = rtt_usecs; 6156 bbr->r_ctl.ts_in = tsin; 6157 if (rsm_send_time) 6158 bbr->r_ctl.cur_rtt_send_time = rsm_send_time; 6159 } 6160 6161 static void 6162 bbr_make_timestamp_determination(struct tcp_bbr *bbr) 6163 { 6164 /** 6165 * We have in our bbr control: 6166 * 1) The timestamp we started observing cum-acks (bbr->r_ctl.bbr_ts_check_tstmp). 6167 * 2) Our timestamp indicating when we sent that packet (bbr->r_ctl.rsm->bbr_ts_check_our_cts). 6168 * 3) The current timestamp that just came in (bbr->r_ctl.last_inbound_ts) 6169 * 4) The time that the packet that generated that ack was sent (bbr->r_ctl.cur_rtt_send_time) 6170 * 6171 * Now we can calculate the time between the sends by doing: 6172 * 6173 * delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts 6174 * 6175 * And the peer's time between receiving them by doing: 6176 * 6177 * peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp 6178 * 6179 * We want to figure out if the timestamp values are in msec, 10msec or usec. 6180 * We also may find that we can't use the timestamps if say we see 6181 * that the peer_delta indicates that though we may have taken 10ms to 6182 * pace out the data, it only saw 1ms between the two packets. This would 6183 * indicate that somewhere on the path is a batching entity that is giving 6184 * out time-slices of the actual b/w. This would mean we could not use 6185 * reliably the peers timestamps. 6186 * 6187 * We expect delta > peer_delta initially. Until we figure out the 6188 * timestamp difference which we will store in bbr->r_ctl.bbr_peer_tsratio. 6189 * If we place 1000 there then its a ms vs our usec. If we place 10000 there 6190 * then its 10ms vs our usec. If the peer is running a usec clock we would 6191 * put a 1 there. If the value is faster then ours, we will disable the 6192 * use of timestamps (though we could revist this later if we find it to be not 6193 * just an isolated one or two flows)). 6194 * 6195 * To detect the batching middle boxes we will come up with our compensation and 6196 * if with it in place, we find the peer is drastically off (by some margin) in 6197 * the smaller direction, then we will assume the worst case and disable use of timestamps. 6198 * 6199 */ 6200 uint64_t delta, peer_delta, delta_up; 6201 6202 delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts; 6203 if (delta < bbr_min_usec_delta) { 6204 /* 6205 * Have not seen a min amount of time 6206 * between our send times so we can 6207 * make a determination of the timestamp 6208 * yet. 6209 */ 6210 return; 6211 } 6212 peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp; 6213 if (peer_delta < bbr_min_peer_delta) { 6214 /* 6215 * We may have enough in the form of 6216 * our delta but the peers number 6217 * has not changed that much. It could 6218 * be its clock ratio is such that 6219 * we need more data (10ms tick) or 6220 * there may be other compression scenarios 6221 * going on. In any event we need the 6222 * spread to be larger. 6223 */ 6224 return; 6225 } 6226 /* Ok lets first see which way our delta is going */ 6227 if (peer_delta > delta) { 6228 /* Very unlikely, the peer without 6229 * compensation shows that it saw 6230 * the two sends arrive further apart 6231 * then we saw then in micro-seconds. 6232 */ 6233 if (peer_delta < (delta + ((delta * (uint64_t)1000)/ (uint64_t)bbr_delta_percent))) { 6234 /* well it looks like the peer is a micro-second clock. */ 6235 bbr->rc_ts_clock_set = 1; 6236 bbr->r_ctl.bbr_peer_tsratio = 1; 6237 } else { 6238 bbr->rc_ts_cant_be_used = 1; 6239 bbr->rc_ts_clock_set = 1; 6240 } 6241 return; 6242 } 6243 /* Ok we know that the peer_delta is smaller than our send distance */ 6244 bbr->rc_ts_clock_set = 1; 6245 /* First question is it within the percentage that they are using usec time? */ 6246 delta_up = (peer_delta * 1000) / (uint64_t)bbr_delta_percent; 6247 if ((peer_delta + delta_up) >= delta) { 6248 /* Its a usec clock */ 6249 bbr->r_ctl.bbr_peer_tsratio = 1; 6250 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6251 return; 6252 } 6253 /* Ok if not usec, what about 10usec (though unlikely)? */ 6254 delta_up = (peer_delta * 1000 * 10) / (uint64_t)bbr_delta_percent; 6255 if (((peer_delta * 10) + delta_up) >= delta) { 6256 bbr->r_ctl.bbr_peer_tsratio = 10; 6257 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6258 return; 6259 } 6260 /* And what about 100usec (though again unlikely)? */ 6261 delta_up = (peer_delta * 1000 * 100) / (uint64_t)bbr_delta_percent; 6262 if (((peer_delta * 100) + delta_up) >= delta) { 6263 bbr->r_ctl.bbr_peer_tsratio = 100; 6264 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6265 return; 6266 } 6267 /* And how about 1 msec (the most likely one)? */ 6268 delta_up = (peer_delta * 1000 * 1000) / (uint64_t)bbr_delta_percent; 6269 if (((peer_delta * 1000) + delta_up) >= delta) { 6270 bbr->r_ctl.bbr_peer_tsratio = 1000; 6271 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6272 return; 6273 } 6274 /* Ok if not msec could it be 10 msec? */ 6275 delta_up = (peer_delta * 1000 * 10000) / (uint64_t)bbr_delta_percent; 6276 if (((peer_delta * 10000) + delta_up) >= delta) { 6277 bbr->r_ctl.bbr_peer_tsratio = 10000; 6278 return; 6279 } 6280 /* If we fall down here the clock tick so slowly we can't use it */ 6281 bbr->rc_ts_cant_be_used = 1; 6282 bbr->r_ctl.bbr_peer_tsratio = 0; 6283 bbr_log_tstmp_validation(bbr, peer_delta, delta); 6284 } 6285 6286 /* 6287 * Collect new round-trip time estimate 6288 * and update averages and current timeout. 6289 */ 6290 static void 6291 tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts) 6292 { 6293 int32_t delta; 6294 uint32_t rtt, tsin; 6295 int32_t rtt_ticks; 6296 6297 if (bbr->rtt_valid == 0) 6298 /* No valid sample */ 6299 return; 6300 6301 rtt = bbr->r_ctl.cur_rtt; 6302 tsin = bbr->r_ctl.ts_in; 6303 if (bbr->rc_prtt_set_ts) { 6304 /* 6305 * We are to force feed the rttProp filter due 6306 * to an entry into PROBE_RTT. This assures 6307 * that the times are sync'd between when we 6308 * go into PROBE_RTT and the filter expiration. 6309 * 6310 * Google does not use a true filter, so they do 6311 * this implicitly since they only keep one value 6312 * and when they enter probe-rtt they update the 6313 * value to the newest rtt. 6314 */ 6315 uint32_t rtt_prop; 6316 6317 bbr->rc_prtt_set_ts = 0; 6318 rtt_prop = get_filter_value_small(&bbr->r_ctl.rc_rttprop); 6319 if (rtt > rtt_prop) 6320 filter_increase_by_small(&bbr->r_ctl.rc_rttprop, (rtt - rtt_prop), cts); 6321 else 6322 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6323 } 6324 if (bbr->rc_ack_was_delayed) 6325 rtt += bbr->r_ctl.rc_ack_hdwr_delay; 6326 6327 if (rtt < bbr->r_ctl.rc_lowest_rtt) 6328 bbr->r_ctl.rc_lowest_rtt = rtt; 6329 bbr_log_rtt_sample(bbr, rtt, tsin); 6330 if (bbr->r_init_rtt) { 6331 /* 6332 * The initial rtt is not-trusted, nuke it and lets get 6333 * our first valid measurement in. 6334 */ 6335 bbr->r_init_rtt = 0; 6336 tp->t_srtt = 0; 6337 } 6338 if ((bbr->rc_ts_clock_set == 0) && bbr->rc_ts_valid) { 6339 /* 6340 * So we have not yet figured out 6341 * what the peers TSTMP value is 6342 * in (most likely ms). We need a 6343 * series of cum-ack's to determine 6344 * this reliably. 6345 */ 6346 if (bbr->rc_ack_is_cumack) { 6347 if (bbr->rc_ts_data_set) { 6348 /* Lets attempt to determine the timestamp granularity. */ 6349 bbr_make_timestamp_determination(bbr); 6350 } else { 6351 bbr->rc_ts_data_set = 1; 6352 bbr->r_ctl.bbr_ts_check_tstmp = bbr->r_ctl.last_inbound_ts; 6353 bbr->r_ctl.bbr_ts_check_our_cts = bbr->r_ctl.cur_rtt_send_time; 6354 } 6355 } else { 6356 /* 6357 * We have to have consecutive acks 6358 * reset any "filled" state to none. 6359 */ 6360 bbr->rc_ts_data_set = 0; 6361 } 6362 } 6363 /* Round it up */ 6364 rtt_ticks = USEC_2_TICKS((rtt + (USECS_IN_MSEC - 1))); 6365 if (rtt_ticks == 0) 6366 rtt_ticks = 1; 6367 if (tp->t_srtt != 0) { 6368 /* 6369 * srtt is stored as fixed point with 5 bits after the 6370 * binary point (i.e., scaled by 8). The following magic is 6371 * equivalent to the smoothing algorithm in rfc793 with an 6372 * alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed point). 6373 * Adjust rtt to origin 0. 6374 */ 6375 6376 delta = ((rtt_ticks - 1) << TCP_DELTA_SHIFT) 6377 - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)); 6378 6379 tp->t_srtt += delta; 6380 if (tp->t_srtt <= 0) 6381 tp->t_srtt = 1; 6382 6383 /* 6384 * We accumulate a smoothed rtt variance (actually, a 6385 * smoothed mean difference), then set the retransmit timer 6386 * to smoothed rtt + 4 times the smoothed variance. rttvar 6387 * is stored as fixed point with 4 bits after the binary 6388 * point (scaled by 16). The following is equivalent to 6389 * rfc793 smoothing with an alpha of .75 (rttvar = 6390 * rttvar*3/4 + |delta| / 4). This replaces rfc793's 6391 * wired-in beta. 6392 */ 6393 if (delta < 0) 6394 delta = -delta; 6395 delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT); 6396 tp->t_rttvar += delta; 6397 if (tp->t_rttvar <= 0) 6398 tp->t_rttvar = 1; 6399 if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar) 6400 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6401 } else { 6402 /* 6403 * No rtt measurement yet - use the unsmoothed rtt. Set the 6404 * variance to half the rtt (so our first retransmit happens 6405 * at 3*rtt). 6406 */ 6407 tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT; 6408 tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1); 6409 tp->t_rttbest = tp->t_srtt + tp->t_rttvar; 6410 } 6411 KMOD_TCPSTAT_INC(tcps_rttupdated); 6412 tp->t_rttupdated++; 6413 #ifdef STATS 6414 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt_ticks)); 6415 #endif 6416 /* 6417 * the retransmit should happen at rtt + 4 * rttvar. Because of the 6418 * way we do the smoothing, srtt and rttvar will each average +1/2 6419 * tick of bias. When we compute the retransmit timer, we want 1/2 6420 * tick of rounding and 1 extra tick because of +-1/2 tick 6421 * uncertainty in the firing of the timer. The bias will give us 6422 * exactly the 1.5 tick we need. But, because the bias is 6423 * statistical, we have to test that we don't drop below the minimum 6424 * feasible timer (which is 2 ticks). 6425 */ 6426 TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), 6427 max(MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), rtt_ticks + 2), 6428 MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); 6429 6430 /* 6431 * We received an ack for a packet that wasn't retransmitted; it is 6432 * probably safe to discard any error indications we've received 6433 * recently. This isn't quite right, but close enough for now (a 6434 * route might have failed after we sent a segment, and the return 6435 * path might not be symmetrical). 6436 */ 6437 tp->t_softerror = 0; 6438 rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); 6439 if (bbr->r_ctl.bbr_smallest_srtt_this_state > rtt) 6440 bbr->r_ctl.bbr_smallest_srtt_this_state = rtt; 6441 } 6442 6443 static void 6444 bbr_set_reduced_rtt(struct tcp_bbr *bbr, uint32_t cts, uint32_t line) 6445 { 6446 bbr->r_ctl.rc_rtt_shrinks = cts; 6447 if (bbr_can_force_probertt && 6448 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 6449 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 6450 /* 6451 * We should enter probe-rtt its been too long 6452 * since we have been there. 6453 */ 6454 bbr_enter_probe_rtt(bbr, cts, __LINE__); 6455 } else 6456 bbr_check_probe_rtt_limits(bbr, cts); 6457 } 6458 6459 static void 6460 tcp_bbr_commit_bw(struct tcp_bbr *bbr, uint32_t cts) 6461 { 6462 uint64_t orig_bw; 6463 6464 if (bbr->r_ctl.rc_bbr_cur_del_rate == 0) { 6465 /* We never apply a zero measurment */ 6466 bbr_log_type_bbrupd(bbr, 20, cts, 0, 0, 6467 0, 0, 0, 0, 0, 0); 6468 return; 6469 } 6470 if (bbr->r_ctl.r_measurement_count < 0xffffffff) 6471 bbr->r_ctl.r_measurement_count++; 6472 orig_bw = get_filter_value(&bbr->r_ctl.rc_delrate); 6473 apply_filter_max(&bbr->r_ctl.rc_delrate, bbr->r_ctl.rc_bbr_cur_del_rate, bbr->r_ctl.rc_pkt_epoch); 6474 bbr_log_type_bbrupd(bbr, 21, cts, (uint32_t)orig_bw, 6475 (uint32_t)get_filter_value(&bbr->r_ctl.rc_delrate), 6476 0, 0, 0, 0, 0, 0); 6477 if (orig_bw && 6478 (orig_bw != get_filter_value(&bbr->r_ctl.rc_delrate))) { 6479 if (bbr->bbr_hdrw_pacing) { 6480 /* 6481 * Apply a new rate to the hardware 6482 * possibly. 6483 */ 6484 bbr_update_hardware_pacing_rate(bbr, cts); 6485 } 6486 bbr_set_state_target(bbr, __LINE__); 6487 tcp_bbr_tso_size_check(bbr, cts); 6488 if (bbr->r_recovery_bw) { 6489 bbr_setup_red_bw(bbr, cts); 6490 bbr_log_type_bw_reduce(bbr, BBR_RED_BW_USELRBW); 6491 } 6492 } else if ((orig_bw == 0) && get_filter_value(&bbr->r_ctl.rc_delrate)) 6493 tcp_bbr_tso_size_check(bbr, cts); 6494 } 6495 6496 static void 6497 bbr_nf_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6498 { 6499 if (bbr->rc_in_persist == 0) { 6500 /* We log only when not in persist */ 6501 /* Translate to a Bytes Per Second */ 6502 uint64_t tim, bw, ts_diff, ts_bw; 6503 uint32_t upper, lower, delivered; 6504 6505 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6506 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6507 else 6508 tim = 1; 6509 /* 6510 * Now that we have processed the tim (skipping the sample 6511 * or possibly updating the time, go ahead and 6512 * calculate the cdr. 6513 */ 6514 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6515 bw = (uint64_t)delivered; 6516 bw *= (uint64_t)USECS_IN_SECOND; 6517 bw /= tim; 6518 if (bw == 0) { 6519 /* We must have a calculatable amount */ 6520 return; 6521 } 6522 upper = (bw >> 32) & 0x00000000ffffffff; 6523 lower = bw & 0x00000000ffffffff; 6524 /* 6525 * If we are using this b/w shove it in now so we 6526 * can see in the trace viewer if it gets over-ridden. 6527 */ 6528 if (rsm->r_ts_valid && 6529 bbr->rc_ts_valid && 6530 bbr->rc_ts_clock_set && 6531 (bbr->rc_ts_cant_be_used == 0) && 6532 bbr->rc_use_ts_limit) { 6533 ts_diff = max((bbr->r_ctl.last_inbound_ts - rsm->r_del_ack_ts), 1); 6534 ts_diff *= bbr->r_ctl.bbr_peer_tsratio; 6535 if ((delivered == 0) || 6536 (rtt < 1000)) { 6537 /* Can't use the ts */ 6538 bbr_log_type_bbrupd(bbr, 61, cts, 6539 ts_diff, 6540 bbr->r_ctl.last_inbound_ts, 6541 rsm->r_del_ack_ts, 0, 6542 0, 0, 0, delivered); 6543 } else { 6544 ts_bw = (uint64_t)delivered; 6545 ts_bw *= (uint64_t)USECS_IN_SECOND; 6546 ts_bw /= ts_diff; 6547 bbr_log_type_bbrupd(bbr, 62, cts, 6548 (ts_bw >> 32), 6549 (ts_bw & 0xffffffff), 0, 0, 6550 0, 0, ts_diff, delivered); 6551 if ((bbr->ts_can_raise) && 6552 (ts_bw > bw)) { 6553 bbr_log_type_bbrupd(bbr, 8, cts, 6554 delivered, 6555 ts_diff, 6556 (bw >> 32), 6557 (bw & 0x00000000ffffffff), 6558 0, 0, 0, 0); 6559 bw = ts_bw; 6560 } else if (ts_bw && (ts_bw < bw)) { 6561 bbr_log_type_bbrupd(bbr, 7, cts, 6562 delivered, 6563 ts_diff, 6564 (bw >> 32), 6565 (bw & 0x00000000ffffffff), 6566 0, 0, 0, 0); 6567 bw = ts_bw; 6568 } 6569 } 6570 } 6571 if (rsm->r_first_sent_time && 6572 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6573 uint64_t sbw, sti; 6574 /* 6575 * We use what was in flight at the time of our 6576 * send and the size of this send to figure 6577 * out what we have been sending at (amount). 6578 * For the time we take from the time of 6579 * the send of the first send outstanding 6580 * until this send plus this sends pacing 6581 * time. This gives us a good calculation 6582 * as to the rate we have been sending at. 6583 */ 6584 6585 sbw = (uint64_t)(rsm->r_flight_at_send); 6586 sbw *= (uint64_t)USECS_IN_SECOND; 6587 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6588 sti += rsm->r_pacing_delay; 6589 sbw /= sti; 6590 if (sbw < bw) { 6591 bbr_log_type_bbrupd(bbr, 6, cts, 6592 delivered, 6593 (uint32_t)sti, 6594 (bw >> 32), 6595 (uint32_t)bw, 6596 rsm->r_first_sent_time, 0, (sbw >> 32), 6597 (uint32_t)sbw); 6598 bw = sbw; 6599 } 6600 } 6601 /* Use the google algorithm for b/w measurements */ 6602 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6603 if ((rsm->r_app_limited == 0) || 6604 (bw > get_filter_value(&bbr->r_ctl.rc_delrate))) { 6605 tcp_bbr_commit_bw(bbr, cts); 6606 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6607 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6608 } 6609 } 6610 } 6611 6612 static void 6613 bbr_google_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) 6614 { 6615 if (bbr->rc_in_persist == 0) { 6616 /* We log only when not in persist */ 6617 /* Translate to a Bytes Per Second */ 6618 uint64_t tim, bw; 6619 uint32_t upper, lower, delivered; 6620 int no_apply = 0; 6621 6622 if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) 6623 tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); 6624 else 6625 tim = 1; 6626 /* 6627 * Now that we have processed the tim (skipping the sample 6628 * or possibly updating the time, go ahead and 6629 * calculate the cdr. 6630 */ 6631 delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); 6632 bw = (uint64_t)delivered; 6633 bw *= (uint64_t)USECS_IN_SECOND; 6634 bw /= tim; 6635 if (tim < bbr->r_ctl.rc_lowest_rtt) { 6636 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6637 tim, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6638 6639 no_apply = 1; 6640 } 6641 upper = (bw >> 32) & 0x00000000ffffffff; 6642 lower = bw & 0x00000000ffffffff; 6643 /* 6644 * If we are using this b/w shove it in now so we 6645 * can see in the trace viewer if it gets over-ridden. 6646 */ 6647 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6648 /* Gate by the sending rate */ 6649 if (rsm->r_first_sent_time && 6650 TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { 6651 uint64_t sbw, sti; 6652 /* 6653 * We use what was in flight at the time of our 6654 * send and the size of this send to figure 6655 * out what we have been sending at (amount). 6656 * For the time we take from the time of 6657 * the send of the first send outstanding 6658 * until this send plus this sends pacing 6659 * time. This gives us a good calculation 6660 * as to the rate we have been sending at. 6661 */ 6662 6663 sbw = (uint64_t)(rsm->r_flight_at_send); 6664 sbw *= (uint64_t)USECS_IN_SECOND; 6665 sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; 6666 sti += rsm->r_pacing_delay; 6667 sbw /= sti; 6668 if (sbw < bw) { 6669 bbr_log_type_bbrupd(bbr, 6, cts, 6670 delivered, 6671 (uint32_t)sti, 6672 (bw >> 32), 6673 (uint32_t)bw, 6674 rsm->r_first_sent_time, 0, (sbw >> 32), 6675 (uint32_t)sbw); 6676 bw = sbw; 6677 } 6678 if ((sti > tim) && 6679 (sti < bbr->r_ctl.rc_lowest_rtt)) { 6680 bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, 6681 (uint32_t)sti, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); 6682 no_apply = 1; 6683 } else 6684 no_apply = 0; 6685 } 6686 bbr->r_ctl.rc_bbr_cur_del_rate = bw; 6687 if ((no_apply == 0) && 6688 ((rsm->r_app_limited == 0) || 6689 (bw > get_filter_value(&bbr->r_ctl.rc_delrate)))) { 6690 tcp_bbr_commit_bw(bbr, cts); 6691 bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, 6692 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); 6693 } 6694 } 6695 } 6696 6697 static void 6698 bbr_update_bbr_info(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts, uint32_t tsin, 6699 uint32_t uts, int32_t match, uint32_t rsm_send_time, int32_t ack_type, struct tcpopt *to) 6700 { 6701 uint64_t old_rttprop; 6702 6703 /* Update our delivery time and amount */ 6704 bbr->r_ctl.rc_delivered += (rsm->r_end - rsm->r_start); 6705 bbr->r_ctl.rc_del_time = cts; 6706 if (rtt == 0) { 6707 /* 6708 * 0 means its a retransmit, for now we don't use these for 6709 * the rest of BBR. 6710 */ 6711 return; 6712 } 6713 if ((bbr->rc_use_google == 0) && 6714 (match != BBR_RTT_BY_EXACTMATCH) && 6715 (match != BBR_RTT_BY_TIMESTAMP)){ 6716 /* 6717 * We get a lot of rtt updates, lets not pay attention to 6718 * any that are not an exact match. That way we don't have 6719 * to worry about timestamps and the whole nonsense of 6720 * unsure if its a retransmission etc (if we ever had the 6721 * timestamp fixed to always have the last thing sent this 6722 * would not be a issue). 6723 */ 6724 return; 6725 } 6726 if ((bbr_no_retran && bbr->rc_use_google) && 6727 (match != BBR_RTT_BY_EXACTMATCH) && 6728 (match != BBR_RTT_BY_TIMESTAMP)){ 6729 /* 6730 * We only do measurements in google mode 6731 * with bbr_no_retran on for sure things. 6732 */ 6733 return; 6734 } 6735 /* Only update srtt if we know by exact match */ 6736 tcp_bbr_xmit_timer(bbr, rtt, rsm_send_time, rsm->r_start, tsin); 6737 if (ack_type == BBR_CUM_ACKED) 6738 bbr->rc_ack_is_cumack = 1; 6739 else 6740 bbr->rc_ack_is_cumack = 0; 6741 old_rttprop = bbr_get_rtt(bbr, BBR_RTT_PROP); 6742 /* 6743 * Note the following code differs to the original 6744 * BBR spec. It calls for <= not <. However after a 6745 * long discussion in email with Neal, he acknowledged 6746 * that it should be < than so that we will have flows 6747 * going into probe-rtt (we were seeing cases where that 6748 * did not happen and caused ugly things to occur). We 6749 * have added this agreed upon fix to our code base. 6750 */ 6751 if (rtt < old_rttprop) { 6752 /* Update when we last saw a rtt drop */ 6753 bbr_log_rtt_shrinks(bbr, cts, 0, rtt, __LINE__, BBR_RTTS_NEWRTT, 0); 6754 bbr_set_reduced_rtt(bbr, cts, __LINE__); 6755 } 6756 bbr_log_type_bbrrttprop(bbr, rtt, (rsm ? rsm->r_end : 0), uts, cts, 6757 match, rsm->r_start, rsm->r_flags); 6758 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 6759 if (old_rttprop != bbr_get_rtt(bbr, BBR_RTT_PROP)) { 6760 /* 6761 * The RTT-prop moved, reset the target (may be a 6762 * nop for some states). 6763 */ 6764 bbr_set_state_target(bbr, __LINE__); 6765 if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) 6766 bbr_log_rtt_shrinks(bbr, cts, 0, 0, 6767 __LINE__, BBR_RTTS_NEW_TARGET, 0); 6768 else if (old_rttprop < bbr_get_rtt(bbr, BBR_RTT_PROP)) 6769 /* It went up */ 6770 bbr_check_probe_rtt_limits(bbr, cts); 6771 } 6772 if ((bbr->rc_use_google == 0) && 6773 (match == BBR_RTT_BY_TIMESTAMP)) { 6774 /* 6775 * We don't do b/w update with 6776 * these since they are not really 6777 * reliable. 6778 */ 6779 return; 6780 } 6781 if (bbr->r_ctl.r_app_limited_until && 6782 (bbr->r_ctl.rc_delivered >= bbr->r_ctl.r_app_limited_until)) { 6783 /* We are no longer app-limited */ 6784 bbr->r_ctl.r_app_limited_until = 0; 6785 } 6786 if (bbr->rc_use_google) { 6787 bbr_google_measurement(bbr, rsm, rtt, cts); 6788 } else { 6789 bbr_nf_measurement(bbr, rsm, rtt, cts); 6790 } 6791 } 6792 6793 /* 6794 * Convert a timestamp that the main stack 6795 * uses (milliseconds) into one that bbr uses 6796 * (microseconds). Return that converted timestamp. 6797 */ 6798 static uint32_t 6799 bbr_ts_convert(uint32_t cts) { 6800 uint32_t sec, msec; 6801 6802 sec = cts / MS_IN_USEC; 6803 msec = cts - (MS_IN_USEC * sec); 6804 return ((sec * USECS_IN_SECOND) + (msec * MS_IN_USEC)); 6805 } 6806 6807 /* 6808 * Return 0 if we did not update the RTT time, return 6809 * 1 if we did. 6810 */ 6811 static int 6812 bbr_update_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, 6813 struct bbr_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, uint32_t th_ack) 6814 { 6815 int32_t i; 6816 uint32_t t, uts = 0; 6817 6818 if ((rsm->r_flags & BBR_ACKED) || 6819 (rsm->r_flags & BBR_WAS_RENEGED) || 6820 (rsm->r_flags & BBR_RXT_CLEARED)) { 6821 /* Already done */ 6822 return (0); 6823 } 6824 if (rsm->r_rtt_not_allowed) { 6825 /* Not allowed */ 6826 return (0); 6827 } 6828 if (rsm->r_rtr_cnt == 1) { 6829 /* 6830 * Only one transmit. Hopefully the normal case. 6831 */ 6832 if (TSTMP_GT(cts, rsm->r_tim_lastsent[0])) 6833 t = cts - rsm->r_tim_lastsent[0]; 6834 else 6835 t = 1; 6836 if ((int)t <= 0) 6837 t = 1; 6838 bbr->r_ctl.rc_last_rtt = t; 6839 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 6840 BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to); 6841 return (1); 6842 } 6843 /* Convert to usecs */ 6844 if ((bbr_can_use_ts_for_rtt == 1) && 6845 (bbr->rc_use_google == 1) && 6846 (ack_type == BBR_CUM_ACKED) && 6847 (to->to_flags & TOF_TS) && 6848 (to->to_tsecr != 0)) { 6849 t = tcp_tv_to_mssectick(&bbr->rc_tv) - to->to_tsecr; 6850 if (t < 1) 6851 t = 1; 6852 t *= MS_IN_USEC; 6853 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, 6854 BBR_RTT_BY_TIMESTAMP, 6855 rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)], 6856 ack_type, to); 6857 return (1); 6858 } 6859 uts = bbr_ts_convert(to->to_tsecr); 6860 if ((to->to_flags & TOF_TS) && 6861 (to->to_tsecr != 0) && 6862 (ack_type == BBR_CUM_ACKED) && 6863 ((rsm->r_flags & BBR_OVERMAX) == 0)) { 6864 /* 6865 * Now which timestamp does it match? In this block the ACK 6866 * may be coming from a previous transmission. 6867 */ 6868 uint32_t fudge; 6869 6870 fudge = BBR_TIMER_FUDGE; 6871 for (i = 0; i < rsm->r_rtr_cnt; i++) { 6872 if ((SEQ_GEQ(uts, (rsm->r_tim_lastsent[i] - fudge))) && 6873 (SEQ_LEQ(uts, (rsm->r_tim_lastsent[i] + fudge)))) { 6874 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6875 t = cts - rsm->r_tim_lastsent[i]; 6876 else 6877 t = 1; 6878 if ((int)t <= 0) 6879 t = 1; 6880 bbr->r_ctl.rc_last_rtt = t; 6881 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING, 6882 rsm->r_tim_lastsent[i], ack_type, to); 6883 if ((i + 1) < rsm->r_rtr_cnt) { 6884 /* Likely */ 6885 return (0); 6886 } else if (rsm->r_flags & BBR_TLP) { 6887 bbr->rc_tlp_rtx_out = 0; 6888 } 6889 return (1); 6890 } 6891 } 6892 /* Fall through if we can't find a matching timestamp */ 6893 } 6894 /* 6895 * Ok its a SACK block that we retransmitted. or a windows 6896 * machine without timestamps. We can tell nothing from the 6897 * time-stamp since its not there or the time the peer last 6898 * recieved a segment that moved forward its cum-ack point. 6899 * 6900 * Lets look at the last retransmit and see what we can tell 6901 * (with BBR for space we only keep 2 note we have to keep 6902 * at least 2 so the map can not be condensed more). 6903 */ 6904 i = rsm->r_rtr_cnt - 1; 6905 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6906 t = cts - rsm->r_tim_lastsent[i]; 6907 else 6908 goto not_sure; 6909 if (t < bbr->r_ctl.rc_lowest_rtt) { 6910 /* 6911 * We retransmitted and the ack came back in less 6912 * than the smallest rtt we have observed in the 6913 * windowed rtt. We most likey did an improper 6914 * retransmit as outlined in 4.2 Step 3 point 2 in 6915 * the rack-draft. 6916 * 6917 * Use the prior transmission to update all the 6918 * information as long as there is only one prior 6919 * transmission. 6920 */ 6921 if ((rsm->r_flags & BBR_OVERMAX) == 0) { 6922 #ifdef BBR_INVARIANTS 6923 if (rsm->r_rtr_cnt == 1) 6924 panic("rsm:%p bbr:%p rsm has overmax and only 1 retranmit flags:%x?", rsm, bbr, rsm->r_flags); 6925 #endif 6926 i = rsm->r_rtr_cnt - 2; 6927 if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) 6928 t = cts - rsm->r_tim_lastsent[i]; 6929 else 6930 t = 1; 6931 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_EARLIER_RET, 6932 rsm->r_tim_lastsent[i], ack_type, to); 6933 return (0); 6934 } else { 6935 /* 6936 * Too many prior transmissions, just 6937 * updated BBR delivered 6938 */ 6939 not_sure: 6940 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 6941 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 6942 } 6943 } else { 6944 /* 6945 * We retransmitted it and the retransmit did the 6946 * job. 6947 */ 6948 if (rsm->r_flags & BBR_TLP) 6949 bbr->rc_tlp_rtx_out = 0; 6950 if ((rsm->r_flags & BBR_OVERMAX) == 0) 6951 bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, 6952 BBR_RTT_BY_THIS_RETRAN, 0, ack_type, to); 6953 else 6954 bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, 6955 BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); 6956 return (1); 6957 } 6958 return (0); 6959 } 6960 6961 /* 6962 * Mark the SACK_PASSED flag on all entries prior to rsm send wise. 6963 */ 6964 static void 6965 bbr_log_sack_passed(struct tcpcb *tp, 6966 struct tcp_bbr *bbr, struct bbr_sendmap *rsm) 6967 { 6968 struct bbr_sendmap *nrsm; 6969 6970 nrsm = rsm; 6971 TAILQ_FOREACH_REVERSE_FROM(nrsm, &bbr->r_ctl.rc_tmap, 6972 bbr_head, r_tnext) { 6973 if (nrsm == rsm) { 6974 /* Skip orginal segment he is acked */ 6975 continue; 6976 } 6977 if (nrsm->r_flags & BBR_ACKED) { 6978 /* Skip ack'd segments */ 6979 continue; 6980 } 6981 if (nrsm->r_flags & BBR_SACK_PASSED) { 6982 /* 6983 * We found one that is already marked 6984 * passed, we have been here before and 6985 * so all others below this are marked. 6986 */ 6987 break; 6988 } 6989 BBR_STAT_INC(bbr_sack_passed); 6990 nrsm->r_flags |= BBR_SACK_PASSED; 6991 if (((nrsm->r_flags & BBR_MARKED_LOST) == 0) && 6992 bbr_is_lost(bbr, nrsm, bbr->r_ctl.rc_rcvtime)) { 6993 bbr->r_ctl.rc_lost += nrsm->r_end - nrsm->r_start; 6994 bbr->r_ctl.rc_lost_bytes += nrsm->r_end - nrsm->r_start; 6995 nrsm->r_flags |= BBR_MARKED_LOST; 6996 } 6997 nrsm->r_flags &= ~BBR_WAS_SACKPASS; 6998 } 6999 } 7000 7001 /* 7002 * Returns the number of bytes that were 7003 * newly ack'd by sack blocks. 7004 */ 7005 static uint32_t 7006 bbr_proc_sack_blk(struct tcpcb *tp, struct tcp_bbr *bbr, struct sackblk *sack, 7007 struct tcpopt *to, struct bbr_sendmap **prsm, uint32_t cts) 7008 { 7009 int32_t times = 0; 7010 uint32_t start, end, maxseg, changed = 0; 7011 struct bbr_sendmap *rsm, *nrsm; 7012 int32_t used_ref = 1; 7013 uint8_t went_back = 0, went_fwd = 0; 7014 7015 maxseg = tp->t_maxseg - bbr->rc_last_options; 7016 start = sack->start; 7017 end = sack->end; 7018 rsm = *prsm; 7019 if (rsm == NULL) 7020 used_ref = 0; 7021 7022 /* Do we locate the block behind where we last were? */ 7023 if (rsm && SEQ_LT(start, rsm->r_start)) { 7024 went_back = 1; 7025 TAILQ_FOREACH_REVERSE_FROM(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 7026 if (SEQ_GEQ(start, rsm->r_start) && 7027 SEQ_LT(start, rsm->r_end)) { 7028 goto do_rest_ofb; 7029 } 7030 } 7031 } 7032 start_at_beginning: 7033 went_fwd = 1; 7034 /* 7035 * Ok lets locate the block where this guy is fwd from rsm (if its 7036 * set) 7037 */ 7038 TAILQ_FOREACH_FROM(rsm, &bbr->r_ctl.rc_map, r_next) { 7039 if (SEQ_GEQ(start, rsm->r_start) && 7040 SEQ_LT(start, rsm->r_end)) { 7041 break; 7042 } 7043 } 7044 do_rest_ofb: 7045 if (rsm == NULL) { 7046 /* 7047 * This happens when we get duplicate sack blocks with the 7048 * same end. For example SACK 4: 100 SACK 3: 100 The sort 7049 * will not change there location so we would just start at 7050 * the end of the first one and get lost. 7051 */ 7052 if (tp->t_flags & TF_SENTFIN) { 7053 /* 7054 * Check to see if we have not logged the FIN that 7055 * went out. 7056 */ 7057 nrsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7058 if (nrsm && (nrsm->r_end + 1) == tp->snd_max) { 7059 /* 7060 * Ok we did not get the FIN logged. 7061 */ 7062 nrsm->r_end++; 7063 rsm = nrsm; 7064 goto do_rest_ofb; 7065 } 7066 } 7067 if (times == 1) { 7068 #ifdef BBR_INVARIANTS 7069 panic("tp:%p bbr:%p sack:%p to:%p prsm:%p", 7070 tp, bbr, sack, to, prsm); 7071 #else 7072 goto out; 7073 #endif 7074 } 7075 times++; 7076 BBR_STAT_INC(bbr_sack_proc_restart); 7077 rsm = NULL; 7078 goto start_at_beginning; 7079 } 7080 /* Ok we have an ACK for some piece of rsm */ 7081 if (rsm->r_start != start) { 7082 /* 7083 * Need to split this in two pieces the before and after. 7084 */ 7085 if (bbr_sack_mergable(rsm, start, end)) 7086 nrsm = bbr_alloc_full_limit(bbr); 7087 else 7088 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7089 if (nrsm == NULL) { 7090 /* We could not allocate ignore the sack */ 7091 struct sackblk blk; 7092 7093 blk.start = start; 7094 blk.end = end; 7095 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7096 goto out; 7097 } 7098 bbr_clone_rsm(bbr, nrsm, rsm, start); 7099 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7100 if (rsm->r_in_tmap) { 7101 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7102 nrsm->r_in_tmap = 1; 7103 } 7104 rsm->r_flags &= (~BBR_HAS_FIN); 7105 rsm = nrsm; 7106 } 7107 if (SEQ_GEQ(end, rsm->r_end)) { 7108 /* 7109 * The end of this block is either beyond this guy or right 7110 * at this guy. 7111 */ 7112 if ((rsm->r_flags & BBR_ACKED) == 0) { 7113 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7114 changed += (rsm->r_end - rsm->r_start); 7115 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7116 bbr_log_sack_passed(tp, bbr, rsm); 7117 if (rsm->r_flags & BBR_MARKED_LOST) { 7118 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7119 } 7120 /* Is Reordering occuring? */ 7121 if (rsm->r_flags & BBR_SACK_PASSED) { 7122 BBR_STAT_INC(bbr_reorder_seen); 7123 bbr->r_ctl.rc_reorder_ts = cts; 7124 if (rsm->r_flags & BBR_MARKED_LOST) { 7125 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7126 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7127 /* LT sampling also needs adjustment */ 7128 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7129 } 7130 } 7131 rsm->r_flags |= BBR_ACKED; 7132 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7133 if (rsm->r_in_tmap) { 7134 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7135 rsm->r_in_tmap = 0; 7136 } 7137 } 7138 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7139 if (end == rsm->r_end) { 7140 /* This block only - done */ 7141 goto out; 7142 } 7143 /* There is more not coverend by this rsm move on */ 7144 start = rsm->r_end; 7145 nrsm = TAILQ_NEXT(rsm, r_next); 7146 rsm = nrsm; 7147 times = 0; 7148 goto do_rest_ofb; 7149 } 7150 if (rsm->r_flags & BBR_ACKED) { 7151 /* Been here done that */ 7152 goto out; 7153 } 7154 /* Ok we need to split off this one at the tail */ 7155 if (bbr_sack_mergable(rsm, start, end)) 7156 nrsm = bbr_alloc_full_limit(bbr); 7157 else 7158 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 7159 if (nrsm == NULL) { 7160 /* failed XXXrrs what can we do but loose the sack info? */ 7161 struct sackblk blk; 7162 7163 blk.start = start; 7164 blk.end = end; 7165 sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); 7166 goto out; 7167 } 7168 /* Clone it */ 7169 bbr_clone_rsm(bbr, nrsm, rsm, end); 7170 /* The sack block does not cover this guy fully */ 7171 rsm->r_flags &= (~BBR_HAS_FIN); 7172 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 7173 if (rsm->r_in_tmap) { 7174 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 7175 nrsm->r_in_tmap = 1; 7176 } 7177 nrsm->r_dupack = 0; 7178 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); 7179 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); 7180 changed += (rsm->r_end - rsm->r_start); 7181 bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); 7182 bbr_log_sack_passed(tp, bbr, rsm); 7183 /* Is Reordering occuring? */ 7184 if (rsm->r_flags & BBR_MARKED_LOST) { 7185 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7186 } 7187 if (rsm->r_flags & BBR_SACK_PASSED) { 7188 BBR_STAT_INC(bbr_reorder_seen); 7189 bbr->r_ctl.rc_reorder_ts = cts; 7190 if (rsm->r_flags & BBR_MARKED_LOST) { 7191 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7192 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7193 /* LT sampling also needs adjustment */ 7194 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7195 } 7196 } 7197 rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); 7198 rsm->r_flags |= BBR_ACKED; 7199 if (rsm->r_in_tmap) { 7200 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7201 rsm->r_in_tmap = 0; 7202 } 7203 out: 7204 if (rsm && (rsm->r_flags & BBR_ACKED)) { 7205 /* 7206 * Now can we merge this newly acked 7207 * block with either the previous or 7208 * next block? 7209 */ 7210 nrsm = TAILQ_NEXT(rsm, r_next); 7211 if (nrsm && 7212 (nrsm->r_flags & BBR_ACKED)) { 7213 /* yep this and next can be merged */ 7214 rsm = bbr_merge_rsm(bbr, rsm, nrsm); 7215 } 7216 /* Now what about the previous? */ 7217 nrsm = TAILQ_PREV(rsm, bbr_head, r_next); 7218 if (nrsm && 7219 (nrsm->r_flags & BBR_ACKED)) { 7220 /* yep the previous and this can be merged */ 7221 rsm = bbr_merge_rsm(bbr, nrsm, rsm); 7222 } 7223 } 7224 if (used_ref == 0) { 7225 BBR_STAT_INC(bbr_sack_proc_all); 7226 } else { 7227 BBR_STAT_INC(bbr_sack_proc_short); 7228 } 7229 if (went_fwd && went_back) { 7230 BBR_STAT_INC(bbr_sack_search_both); 7231 } else if (went_fwd) { 7232 BBR_STAT_INC(bbr_sack_search_fwd); 7233 } else if (went_back) { 7234 BBR_STAT_INC(bbr_sack_search_back); 7235 } 7236 /* Save off where the next seq is */ 7237 if (rsm) 7238 bbr->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next); 7239 else 7240 bbr->r_ctl.rc_sacklast = NULL; 7241 *prsm = rsm; 7242 return (changed); 7243 } 7244 7245 static void inline 7246 bbr_peer_reneges(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, tcp_seq th_ack) 7247 { 7248 struct bbr_sendmap *tmap; 7249 7250 BBR_STAT_INC(bbr_reneges_seen); 7251 tmap = NULL; 7252 while (rsm && (rsm->r_flags & BBR_ACKED)) { 7253 /* Its no longer sacked, mark it so */ 7254 uint32_t oflags; 7255 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7256 #ifdef BBR_INVARIANTS 7257 if (rsm->r_in_tmap) { 7258 panic("bbr:%p rsm:%p flags:0x%x in tmap?", 7259 bbr, rsm, rsm->r_flags); 7260 } 7261 #endif 7262 oflags = rsm->r_flags; 7263 if (rsm->r_flags & BBR_MARKED_LOST) { 7264 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7265 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7266 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7267 /* LT sampling also needs adjustment */ 7268 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7269 } 7270 rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS | BBR_MARKED_LOST); 7271 rsm->r_flags |= BBR_WAS_RENEGED; 7272 rsm->r_flags |= BBR_RXT_CLEARED; 7273 bbr_log_type_rsmclear(bbr, bbr->r_ctl.rc_rcvtime, rsm, oflags, __LINE__); 7274 /* Rebuild it into our tmap */ 7275 if (tmap == NULL) { 7276 TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7277 tmap = rsm; 7278 } else { 7279 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, tmap, rsm, r_tnext); 7280 tmap = rsm; 7281 } 7282 tmap->r_in_tmap = 1; 7283 /* 7284 * XXXrrs Delivered? Should we do anything here? 7285 * 7286 * Of course we don't on a rxt timeout so maybe its ok that 7287 * we don't? 7288 * 7289 * For now lets not. 7290 */ 7291 rsm = TAILQ_NEXT(rsm, r_next); 7292 } 7293 /* 7294 * Now lets possibly clear the sack filter so we start recognizing 7295 * sacks that cover this area. 7296 */ 7297 sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack); 7298 } 7299 7300 static void 7301 bbr_log_syn(struct tcpcb *tp, struct tcpopt *to) 7302 { 7303 struct tcp_bbr *bbr; 7304 struct bbr_sendmap *rsm; 7305 uint32_t cts; 7306 7307 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7308 cts = bbr->r_ctl.rc_rcvtime; 7309 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7310 if (rsm && (rsm->r_flags & BBR_HAS_SYN)) { 7311 if ((rsm->r_end - rsm->r_start) <= 1) { 7312 /* Log out the SYN completely */ 7313 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7314 rsm->r_rtr_bytes = 0; 7315 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7316 if (rsm->r_in_tmap) { 7317 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7318 rsm->r_in_tmap = 0; 7319 } 7320 if (bbr->r_ctl.rc_next == rsm) { 7321 /* scoot along the marker */ 7322 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7323 } 7324 if (to != NULL) 7325 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, 0); 7326 bbr_free(bbr, rsm); 7327 } else { 7328 /* There is more (Fast open)? strip out SYN. */ 7329 rsm->r_flags &= ~BBR_HAS_SYN; 7330 rsm->r_start++; 7331 } 7332 } 7333 } 7334 7335 /* 7336 * Returns the number of bytes that were 7337 * acknowledged by SACK blocks. 7338 */ 7339 7340 static uint32_t 7341 bbr_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, 7342 uint32_t *prev_acked) 7343 { 7344 uint32_t changed, last_seq, entered_recovery = 0; 7345 struct tcp_bbr *bbr; 7346 struct bbr_sendmap *rsm; 7347 struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1]; 7348 register uint32_t th_ack; 7349 int32_t i, j, k, new_sb, num_sack_blks = 0; 7350 uint32_t cts, acked, ack_point, sack_changed = 0; 7351 uint32_t p_maxseg, maxseg, p_acked = 0; 7352 7353 INP_WLOCK_ASSERT(tp->t_inpcb); 7354 if (th->th_flags & TH_RST) { 7355 /* We don't log resets */ 7356 return (0); 7357 } 7358 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7359 cts = bbr->r_ctl.rc_rcvtime; 7360 7361 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7362 changed = 0; 7363 maxseg = tp->t_maxseg - bbr->rc_last_options; 7364 p_maxseg = min(bbr->r_ctl.rc_pace_max_segs, maxseg); 7365 th_ack = th->th_ack; 7366 if (SEQ_GT(th_ack, tp->snd_una)) { 7367 acked = th_ack - tp->snd_una; 7368 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_UPDATE, __LINE__); 7369 bbr->rc_tp->t_acktime = ticks; 7370 } else 7371 acked = 0; 7372 if (SEQ_LEQ(th_ack, tp->snd_una)) { 7373 /* Only sent here for sack processing */ 7374 goto proc_sack; 7375 } 7376 if (rsm && SEQ_GT(th_ack, rsm->r_start)) { 7377 changed = th_ack - rsm->r_start; 7378 } else if ((rsm == NULL) && ((th_ack - 1) == tp->iss)) { 7379 /* 7380 * For the SYN incoming case we will not have called 7381 * tcp_output for the sending of the SYN, so there will be 7382 * no map. All other cases should probably be a panic. 7383 */ 7384 if ((to->to_flags & TOF_TS) && (to->to_tsecr != 0)) { 7385 /* 7386 * We have a timestamp that can be used to generate 7387 * an initial RTT. 7388 */ 7389 uint32_t ts, now, rtt; 7390 7391 ts = bbr_ts_convert(to->to_tsecr); 7392 now = bbr_ts_convert(tcp_tv_to_mssectick(&bbr->rc_tv)); 7393 rtt = now - ts; 7394 if (rtt < 1) 7395 rtt = 1; 7396 bbr_log_type_bbrrttprop(bbr, rtt, 7397 tp->iss, 0, cts, 7398 BBR_RTT_BY_TIMESTAMP, tp->iss, 0); 7399 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 7400 changed = 1; 7401 bbr->r_wanted_output = 1; 7402 goto out; 7403 } 7404 goto proc_sack; 7405 } else if (rsm == NULL) { 7406 goto out; 7407 } 7408 if (changed) { 7409 /* 7410 * The ACK point is advancing to th_ack, we must drop off 7411 * the packets in the rack log and calculate any eligble 7412 * RTT's. 7413 */ 7414 bbr->r_wanted_output = 1; 7415 more: 7416 if (rsm == NULL) { 7417 if (tp->t_flags & TF_SENTFIN) { 7418 /* if we send a FIN we will not hav a map */ 7419 goto proc_sack; 7420 } 7421 #ifdef BBR_INVARIANTS 7422 panic("No rack map tp:%p for th:%p state:%d bbr:%p snd_una:%u snd_max:%u chg:%d\n", 7423 tp, 7424 th, tp->t_state, bbr, 7425 tp->snd_una, tp->snd_max, changed); 7426 #endif 7427 goto proc_sack; 7428 } 7429 } 7430 if (SEQ_LT(th_ack, rsm->r_start)) { 7431 /* Huh map is missing this */ 7432 #ifdef BBR_INVARIANTS 7433 printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d bbr:%p\n", 7434 rsm->r_start, 7435 th_ack, tp->t_state, 7436 bbr->r_state, bbr); 7437 panic("th-ack is bad bbr:%p tp:%p", bbr, tp); 7438 #endif 7439 goto proc_sack; 7440 } else if (th_ack == rsm->r_start) { 7441 /* None here to ack */ 7442 goto proc_sack; 7443 } 7444 /* 7445 * Clear the dup ack counter, it will 7446 * either be freed or if there is some 7447 * remaining we need to start it at zero. 7448 */ 7449 rsm->r_dupack = 0; 7450 /* Now do we consume the whole thing? */ 7451 if (SEQ_GEQ(th_ack, rsm->r_end)) { 7452 /* Its all consumed. */ 7453 uint32_t left; 7454 7455 if (rsm->r_flags & BBR_ACKED) { 7456 /* 7457 * It was acked on the scoreboard -- remove it from 7458 * total 7459 */ 7460 p_acked += (rsm->r_end - rsm->r_start); 7461 bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); 7462 if (bbr->r_ctl.rc_sacked == 0) 7463 bbr->r_ctl.rc_sacklast = NULL; 7464 } else { 7465 bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, th_ack); 7466 if (rsm->r_flags & BBR_MARKED_LOST) { 7467 bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; 7468 } 7469 if (rsm->r_flags & BBR_SACK_PASSED) { 7470 /* 7471 * There are acked segments ACKED on the 7472 * scoreboard further up. We are seeing 7473 * reordering. 7474 */ 7475 BBR_STAT_INC(bbr_reorder_seen); 7476 bbr->r_ctl.rc_reorder_ts = cts; 7477 if (rsm->r_flags & BBR_MARKED_LOST) { 7478 bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; 7479 if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) 7480 /* LT sampling also needs adjustment */ 7481 bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; 7482 } 7483 } 7484 rsm->r_flags &= ~BBR_MARKED_LOST; 7485 } 7486 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7487 rsm->r_rtr_bytes = 0; 7488 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 7489 if (rsm->r_in_tmap) { 7490 TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 7491 rsm->r_in_tmap = 0; 7492 } 7493 if (bbr->r_ctl.rc_next == rsm) { 7494 /* scoot along the marker */ 7495 bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7496 } 7497 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7498 /* Adjust the packet counts */ 7499 left = th_ack - rsm->r_end; 7500 /* Free back to zone */ 7501 bbr_free(bbr, rsm); 7502 if (left) { 7503 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7504 goto more; 7505 } 7506 goto proc_sack; 7507 } 7508 if (rsm->r_flags & BBR_ACKED) { 7509 /* 7510 * It was acked on the scoreboard -- remove it from total 7511 * for the part being cum-acked. 7512 */ 7513 p_acked += (rsm->r_end - rsm->r_start); 7514 bbr->r_ctl.rc_sacked -= (th_ack - rsm->r_start); 7515 if (bbr->r_ctl.rc_sacked == 0) 7516 bbr->r_ctl.rc_sacklast = NULL; 7517 } else { 7518 /* 7519 * It was acked up to th_ack point for the first time 7520 */ 7521 struct bbr_sendmap lrsm; 7522 7523 memcpy(&lrsm, rsm, sizeof(struct bbr_sendmap)); 7524 lrsm.r_end = th_ack; 7525 bbr_update_rtt(tp, bbr, &lrsm, to, cts, BBR_CUM_ACKED, th_ack); 7526 } 7527 if ((rsm->r_flags & BBR_MARKED_LOST) && 7528 ((rsm->r_flags & BBR_ACKED) == 0)) { 7529 /* 7530 * It was marked lost and partly ack'd now 7531 * for the first time. We lower the rc_lost_bytes 7532 * and still leave it MARKED. 7533 */ 7534 bbr->r_ctl.rc_lost_bytes -= th_ack - rsm->r_start; 7535 } 7536 bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); 7537 bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; 7538 rsm->r_rtr_bytes = 0; 7539 /* adjust packet count */ 7540 rsm->r_start = th_ack; 7541 proc_sack: 7542 /* Check for reneging */ 7543 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 7544 if (rsm && (rsm->r_flags & BBR_ACKED) && (th_ack == rsm->r_start)) { 7545 /* 7546 * The peer has moved snd_una up to the edge of this send, 7547 * i.e. one that it had previously acked. The only way that 7548 * can be true if the peer threw away data (space issues) 7549 * that it had previously sacked (else it would have given 7550 * us snd_una up to (rsm->r_end). We need to undo the acked 7551 * markings here. 7552 * 7553 * Note we have to look to make sure th_ack is our 7554 * rsm->r_start in case we get an old ack where th_ack is 7555 * behind snd_una. 7556 */ 7557 bbr_peer_reneges(bbr, rsm, th->th_ack); 7558 } 7559 if ((to->to_flags & TOF_SACK) == 0) { 7560 /* We are done nothing left to log */ 7561 goto out; 7562 } 7563 rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); 7564 if (rsm) { 7565 last_seq = rsm->r_end; 7566 } else { 7567 last_seq = tp->snd_max; 7568 } 7569 /* Sack block processing */ 7570 if (SEQ_GT(th_ack, tp->snd_una)) 7571 ack_point = th_ack; 7572 else 7573 ack_point = tp->snd_una; 7574 for (i = 0; i < to->to_nsacks; i++) { 7575 bcopy((to->to_sacks + i * TCPOLEN_SACK), 7576 &sack, sizeof(sack)); 7577 sack.start = ntohl(sack.start); 7578 sack.end = ntohl(sack.end); 7579 if (SEQ_GT(sack.end, sack.start) && 7580 SEQ_GT(sack.start, ack_point) && 7581 SEQ_LT(sack.start, tp->snd_max) && 7582 SEQ_GT(sack.end, ack_point) && 7583 SEQ_LEQ(sack.end, tp->snd_max)) { 7584 if ((bbr->r_ctl.rc_num_small_maps_alloced > bbr_sack_block_limit) && 7585 (SEQ_LT(sack.end, last_seq)) && 7586 ((sack.end - sack.start) < (p_maxseg / 8))) { 7587 /* 7588 * Not the last piece and its smaller than 7589 * 1/8th of a p_maxseg. We ignore this. 7590 */ 7591 BBR_STAT_INC(bbr_runt_sacks); 7592 continue; 7593 } 7594 sack_blocks[num_sack_blks] = sack; 7595 num_sack_blks++; 7596 } else if (SEQ_LEQ(sack.start, th_ack) && 7597 SEQ_LEQ(sack.end, th_ack)) { 7598 /* 7599 * Its a D-SACK block. 7600 */ 7601 tcp_record_dsack(tp, sack.start, sack.end, 0); 7602 } 7603 } 7604 if (num_sack_blks == 0) 7605 goto out; 7606 /* 7607 * Sort the SACK blocks so we can update the rack scoreboard with 7608 * just one pass. 7609 */ 7610 new_sb = sack_filter_blks(&bbr->r_ctl.bbr_sf, sack_blocks, 7611 num_sack_blks, th->th_ack); 7612 ctf_log_sack_filter(bbr->rc_tp, new_sb, sack_blocks); 7613 BBR_STAT_ADD(bbr_sack_blocks, num_sack_blks); 7614 BBR_STAT_ADD(bbr_sack_blocks_skip, (num_sack_blks - new_sb)); 7615 num_sack_blks = new_sb; 7616 if (num_sack_blks < 2) { 7617 goto do_sack_work; 7618 } 7619 /* Sort the sacks */ 7620 for (i = 0; i < num_sack_blks; i++) { 7621 for (j = i + 1; j < num_sack_blks; j++) { 7622 if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) { 7623 sack = sack_blocks[i]; 7624 sack_blocks[i] = sack_blocks[j]; 7625 sack_blocks[j] = sack; 7626 } 7627 } 7628 } 7629 /* 7630 * Now are any of the sack block ends the same (yes some 7631 * implememtations send these)? 7632 */ 7633 again: 7634 if (num_sack_blks > 1) { 7635 for (i = 0; i < num_sack_blks; i++) { 7636 for (j = i + 1; j < num_sack_blks; j++) { 7637 if (sack_blocks[i].end == sack_blocks[j].end) { 7638 /* 7639 * Ok these two have the same end we 7640 * want the smallest end and then 7641 * throw away the larger and start 7642 * again. 7643 */ 7644 if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) { 7645 /* 7646 * The second block covers 7647 * more area use that 7648 */ 7649 sack_blocks[i].start = sack_blocks[j].start; 7650 } 7651 /* 7652 * Now collapse out the dup-sack and 7653 * lower the count 7654 */ 7655 for (k = (j + 1); k < num_sack_blks; k++) { 7656 sack_blocks[j].start = sack_blocks[k].start; 7657 sack_blocks[j].end = sack_blocks[k].end; 7658 j++; 7659 } 7660 num_sack_blks--; 7661 goto again; 7662 } 7663 } 7664 } 7665 } 7666 do_sack_work: 7667 rsm = bbr->r_ctl.rc_sacklast; 7668 for (i = 0; i < num_sack_blks; i++) { 7669 acked = bbr_proc_sack_blk(tp, bbr, &sack_blocks[i], to, &rsm, cts); 7670 if (acked) { 7671 bbr->r_wanted_output = 1; 7672 changed += acked; 7673 sack_changed += acked; 7674 } 7675 } 7676 out: 7677 *prev_acked = p_acked; 7678 if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) { 7679 /* 7680 * Ok we have a high probability that we need to go in to 7681 * recovery since we have data sack'd 7682 */ 7683 struct bbr_sendmap *rsm; 7684 7685 rsm = bbr_check_recovery_mode(tp, bbr, cts); 7686 if (rsm) { 7687 /* Enter recovery */ 7688 entered_recovery = 1; 7689 bbr->r_wanted_output = 1; 7690 /* 7691 * When we enter recovery we need to assure we send 7692 * one packet. 7693 */ 7694 if (bbr->r_ctl.rc_resend == NULL) { 7695 bbr->r_ctl.rc_resend = rsm; 7696 } 7697 } 7698 } 7699 if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) { 7700 /* 7701 * See if we need to rack-retransmit anything if so set it 7702 * up as the thing to resend assuming something else is not 7703 * already in that position. 7704 */ 7705 if (bbr->r_ctl.rc_resend == NULL) { 7706 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 7707 } 7708 } 7709 /* 7710 * We return the amount that changed via sack, this is used by the 7711 * ack-received code to augment what was changed between th_ack <-> 7712 * snd_una. 7713 */ 7714 return (sack_changed); 7715 } 7716 7717 static void 7718 bbr_strike_dupack(struct tcp_bbr *bbr) 7719 { 7720 struct bbr_sendmap *rsm; 7721 7722 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); 7723 if (rsm && (rsm->r_dupack < 0xff)) { 7724 rsm->r_dupack++; 7725 if (rsm->r_dupack >= DUP_ACK_THRESHOLD) 7726 bbr->r_wanted_output = 1; 7727 } 7728 } 7729 7730 /* 7731 * Return value of 1, we do not need to call bbr_process_data(). 7732 * return value of 0, bbr_process_data can be called. 7733 * For ret_val if its 0 the TCB is locked and valid, if its non-zero 7734 * its unlocked and probably unsafe to touch the TCB. 7735 */ 7736 static int 7737 bbr_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, 7738 struct tcpcb *tp, struct tcpopt *to, 7739 uint32_t tiwin, int32_t tlen, 7740 int32_t * ofia, int32_t thflags, int32_t * ret_val) 7741 { 7742 int32_t ourfinisacked = 0; 7743 int32_t acked_amount; 7744 uint16_t nsegs; 7745 int32_t acked; 7746 uint32_t lost, sack_changed = 0; 7747 struct mbuf *mfree; 7748 struct tcp_bbr *bbr; 7749 uint32_t prev_acked = 0; 7750 7751 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 7752 lost = bbr->r_ctl.rc_lost; 7753 nsegs = max(1, m->m_pkthdr.lro_nsegs); 7754 if (SEQ_GT(th->th_ack, tp->snd_max)) { 7755 ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val); 7756 bbr->r_wanted_output = 1; 7757 return (1); 7758 } 7759 if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) { 7760 /* Process the ack */ 7761 if (bbr->rc_in_persist) 7762 tp->t_rxtshift = 0; 7763 if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd)) 7764 bbr_strike_dupack(bbr); 7765 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 7766 } 7767 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, (bbr->r_ctl.rc_lost > lost)); 7768 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 7769 /* 7770 * Old ack, behind the last one rcv'd or a duplicate ack 7771 * with SACK info. 7772 */ 7773 if (th->th_ack == tp->snd_una) { 7774 bbr_ack_received(tp, bbr, th, 0, sack_changed, prev_acked, __LINE__, 0); 7775 if (bbr->r_state == TCPS_SYN_SENT) { 7776 /* 7777 * Special case on where we sent SYN. When 7778 * the SYN-ACK is processed in syn_sent 7779 * state it bumps the snd_una. This causes 7780 * us to hit here even though we did ack 1 7781 * byte. 7782 * 7783 * Go through the nothing left case so we 7784 * send data. 7785 */ 7786 goto nothing_left; 7787 } 7788 } 7789 return (0); 7790 } 7791 /* 7792 * If we reach this point, ACK is not a duplicate, i.e., it ACKs 7793 * something we sent. 7794 */ 7795 if (tp->t_flags & TF_NEEDSYN) { 7796 /* 7797 * T/TCP: Connection was half-synchronized, and our SYN has 7798 * been ACK'd (so connection is now fully synchronized). Go 7799 * to non-starred state, increment snd_una for ACK of SYN, 7800 * and check if we can do window scaling. 7801 */ 7802 tp->t_flags &= ~TF_NEEDSYN; 7803 tp->snd_una++; 7804 /* Do window scaling? */ 7805 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 7806 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 7807 tp->rcv_scale = tp->request_r_scale; 7808 /* Send window already scaled. */ 7809 } 7810 } 7811 INP_WLOCK_ASSERT(tp->t_inpcb); 7812 7813 acked = BYTES_THIS_ACK(tp, th); 7814 KMOD_TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 7815 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked); 7816 7817 /* 7818 * If we just performed our first retransmit, and the ACK arrives 7819 * within our recovery window, then it was a mistake to do the 7820 * retransmit in the first place. Recover our original cwnd and 7821 * ssthresh, and proceed to transmit where we left off. 7822 */ 7823 if (tp->t_flags & TF_PREVVALID) { 7824 tp->t_flags &= ~TF_PREVVALID; 7825 if (tp->t_rxtshift == 1 && 7826 (int)(ticks - tp->t_badrxtwin) < 0) 7827 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 7828 } 7829 SOCKBUF_LOCK(&so->so_snd); 7830 acked_amount = min(acked, (int)sbavail(&so->so_snd)); 7831 tp->snd_wnd -= acked_amount; 7832 mfree = sbcut_locked(&so->so_snd, acked_amount); 7833 /* NB: sowwakeup_locked() does an implicit unlock. */ 7834 sowwakeup_locked(so); 7835 m_freem(mfree); 7836 if (SEQ_GT(th->th_ack, tp->snd_una)) { 7837 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 7838 } 7839 tp->snd_una = th->th_ack; 7840 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, (bbr->r_ctl.rc_lost - lost)); 7841 if (IN_RECOVERY(tp->t_flags)) { 7842 if (SEQ_LT(th->th_ack, tp->snd_recover) && 7843 (SEQ_LT(th->th_ack, tp->snd_max))) { 7844 tcp_bbr_partialack(tp); 7845 } else { 7846 bbr_post_recovery(tp); 7847 } 7848 } 7849 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 7850 tp->snd_recover = tp->snd_una; 7851 } 7852 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 7853 tp->snd_nxt = tp->snd_max; 7854 } 7855 if (tp->snd_una == tp->snd_max) { 7856 /* Nothing left outstanding */ 7857 nothing_left: 7858 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 7859 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 7860 bbr->rc_tp->t_acktime = 0; 7861 if ((sbused(&so->so_snd) == 0) && 7862 (tp->t_flags & TF_SENTFIN)) { 7863 ourfinisacked = 1; 7864 } 7865 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 7866 if (bbr->rc_in_persist == 0) { 7867 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 7868 } 7869 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 7870 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 7871 /* 7872 * We invalidate the last ack here since we 7873 * don't want to transfer forward the time 7874 * for our sum's calculations. 7875 */ 7876 if ((tp->t_state >= TCPS_FIN_WAIT_1) && 7877 (sbavail(&so->so_snd) == 0) && 7878 (tp->t_flags2 & TF2_DROP_AF_DATA)) { 7879 /* 7880 * The socket was gone and the peer sent data, time 7881 * to reset him. 7882 */ 7883 *ret_val = 1; 7884 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE); 7885 /* tcp_close will kill the inp pre-log the Reset */ 7886 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 7887 tp = tcp_close(tp); 7888 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); 7889 BBR_STAT_INC(bbr_dropped_af_data); 7890 return (1); 7891 } 7892 /* Set need output so persist might get set */ 7893 bbr->r_wanted_output = 1; 7894 } 7895 if (ofia) 7896 *ofia = ourfinisacked; 7897 return (0); 7898 } 7899 7900 static void 7901 bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 7902 { 7903 if (bbr->rc_in_persist == 0) { 7904 bbr_timer_cancel(bbr, __LINE__, cts); 7905 bbr->r_ctl.rc_last_delay_val = 0; 7906 tp->t_rxtshift = 0; 7907 bbr->rc_in_persist = 1; 7908 bbr->r_ctl.rc_went_idle_time = cts; 7909 /* We should be capped when rw went to 0 but just in case */ 7910 bbr_log_type_pesist(bbr, cts, 0, line, 1); 7911 /* Time freezes for the state, so do the accounting now */ 7912 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 7913 uint32_t time_in; 7914 7915 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 7916 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 7917 int32_t idx; 7918 7919 idx = bbr_state_val(bbr); 7920 counter_u64_add(bbr_state_time[(idx + 5)], time_in); 7921 } else { 7922 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 7923 } 7924 } 7925 bbr->r_ctl.rc_bbr_state_time = cts; 7926 } 7927 } 7928 7929 static void 7930 bbr_restart_after_idle(struct tcp_bbr *bbr, uint32_t cts, uint32_t idle_time) 7931 { 7932 /* 7933 * Note that if idle time does not exceed our 7934 * threshold, we do nothing continuing the state 7935 * transitions we were last walking through. 7936 */ 7937 if (idle_time >= bbr_idle_restart_threshold) { 7938 if (bbr->rc_use_idle_restart) { 7939 bbr->rc_bbr_state = BBR_STATE_IDLE_EXIT; 7940 /* 7941 * Set our target using BBR_UNIT, so 7942 * we increase at a dramatic rate but 7943 * we stop when we get the pipe 7944 * full again for our current b/w estimate. 7945 */ 7946 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 7947 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 7948 bbr_set_state_target(bbr, __LINE__); 7949 /* Now setup our gains to ramp up */ 7950 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 7951 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 7952 bbr_log_type_statechange(bbr, cts, __LINE__); 7953 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 7954 bbr_substate_change(bbr, cts, __LINE__, 1); 7955 } 7956 } 7957 } 7958 7959 static void 7960 bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) 7961 { 7962 uint32_t idle_time; 7963 7964 if (bbr->rc_in_persist == 0) 7965 return; 7966 idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time); 7967 bbr->rc_in_persist = 0; 7968 bbr->rc_hit_state_1 = 0; 7969 bbr->r_ctl.rc_del_time = cts; 7970 /* 7971 * We invalidate the last ack here since we 7972 * don't want to transfer forward the time 7973 * for our sum's calculations. 7974 */ 7975 if (bbr->rc_inp->inp_in_hpts) { 7976 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 7977 bbr->rc_timer_first = 0; 7978 bbr->r_ctl.rc_hpts_flags = 0; 7979 bbr->r_ctl.rc_last_delay_val = 0; 7980 bbr->r_ctl.rc_hptsi_agg_delay = 0; 7981 bbr->r_agg_early_set = 0; 7982 bbr->r_ctl.rc_agg_early = 0; 7983 } 7984 bbr_log_type_pesist(bbr, cts, idle_time, line, 0); 7985 if (idle_time >= bbr_rtt_probe_time) { 7986 /* 7987 * This qualifies as a RTT_PROBE session since we drop the 7988 * data outstanding to nothing and waited more than 7989 * bbr_rtt_probe_time. 7990 */ 7991 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0); 7992 bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts; 7993 } 7994 tp->t_rxtshift = 0; 7995 /* 7996 * If in probeBW and we have persisted more than an RTT lets do 7997 * special handling. 7998 */ 7999 /* Force a time based epoch */ 8000 bbr_set_epoch(bbr, cts, __LINE__); 8001 /* 8002 * Setup the lost so we don't count anything against the guy 8003 * we have been stuck with during persists. 8004 */ 8005 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 8006 /* Time un-freezes for the state */ 8007 bbr->r_ctl.rc_bbr_state_time = cts; 8008 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) || 8009 (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) { 8010 /* 8011 * If we are going back to probe-bw 8012 * or probe_rtt, we may need to possibly 8013 * do a fast restart. 8014 */ 8015 bbr_restart_after_idle(bbr, cts, idle_time); 8016 } 8017 } 8018 8019 static void 8020 bbr_collapsed_window(struct tcp_bbr *bbr) 8021 { 8022 /* 8023 * Now we must walk the 8024 * send map and divide the 8025 * ones left stranded. These 8026 * guys can't cause us to abort 8027 * the connection and are really 8028 * "unsent". However if a buggy 8029 * client actually did keep some 8030 * of the data i.e. collapsed the win 8031 * and refused to ack and then opened 8032 * the win and acked that data. We would 8033 * get into an ack war, the simplier 8034 * method then of just pretending we 8035 * did not send those segments something 8036 * won't work. 8037 */ 8038 struct bbr_sendmap *rsm, *nrsm; 8039 tcp_seq max_seq; 8040 uint32_t maxseg; 8041 int can_split = 0; 8042 int fnd = 0; 8043 8044 maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; 8045 max_seq = bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd; 8046 bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0); 8047 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 8048 /* Find the first seq past or at maxseq */ 8049 if (rsm->r_flags & BBR_RWND_COLLAPSED) 8050 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8051 if (SEQ_GEQ(max_seq, rsm->r_start) && 8052 SEQ_GEQ(rsm->r_end, max_seq)) { 8053 fnd = 1; 8054 break; 8055 } 8056 } 8057 bbr->rc_has_collapsed = 0; 8058 if (!fnd) { 8059 /* Nothing to do strange */ 8060 return; 8061 } 8062 /* 8063 * Now can we split? 8064 * 8065 * We don't want to split if splitting 8066 * would generate too many small segments 8067 * less we let an attacker fragment our 8068 * send_map and leave us out of memory. 8069 */ 8070 if ((max_seq != rsm->r_start) && 8071 (max_seq != rsm->r_end)){ 8072 /* can we split? */ 8073 int res1, res2; 8074 8075 res1 = max_seq - rsm->r_start; 8076 res2 = rsm->r_end - max_seq; 8077 if ((res1 >= (maxseg/8)) && 8078 (res2 >= (maxseg/8))) { 8079 /* No small pieces here */ 8080 can_split = 1; 8081 } else if (bbr->r_ctl.rc_num_small_maps_alloced < bbr_sack_block_limit) { 8082 /* We are under the limit */ 8083 can_split = 1; 8084 } 8085 } 8086 /* Ok do we need to split this rsm? */ 8087 if (max_seq == rsm->r_start) { 8088 /* It's this guy no split required */ 8089 nrsm = rsm; 8090 } else if (max_seq == rsm->r_end) { 8091 /* It's the next one no split required. */ 8092 nrsm = TAILQ_NEXT(rsm, r_next); 8093 if (nrsm == NULL) { 8094 /* Huh? */ 8095 return; 8096 } 8097 } else if (can_split && SEQ_LT(max_seq, rsm->r_end)) { 8098 /* yep we need to split it */ 8099 nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); 8100 if (nrsm == NULL) { 8101 /* failed XXXrrs what can we do mark the whole? */ 8102 nrsm = rsm; 8103 goto no_split; 8104 } 8105 /* Clone it */ 8106 bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0); 8107 bbr_clone_rsm(bbr, nrsm, rsm, max_seq); 8108 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); 8109 if (rsm->r_in_tmap) { 8110 TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); 8111 nrsm->r_in_tmap = 1; 8112 } 8113 } else { 8114 /* 8115 * Split not allowed just start here just 8116 * use this guy. 8117 */ 8118 nrsm = rsm; 8119 } 8120 no_split: 8121 BBR_STAT_INC(bbr_collapsed_win); 8122 /* reuse fnd as a count */ 8123 fnd = 0; 8124 TAILQ_FOREACH_FROM(nrsm, &bbr->r_ctl.rc_map, r_next) { 8125 nrsm->r_flags |= BBR_RWND_COLLAPSED; 8126 fnd++; 8127 bbr->rc_has_collapsed = 1; 8128 } 8129 bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd); 8130 } 8131 8132 static void 8133 bbr_un_collapse_window(struct tcp_bbr *bbr) 8134 { 8135 struct bbr_sendmap *rsm; 8136 int cleared = 0; 8137 8138 TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { 8139 if (rsm->r_flags & BBR_RWND_COLLAPSED) { 8140 /* Clear the flag */ 8141 rsm->r_flags &= ~BBR_RWND_COLLAPSED; 8142 cleared++; 8143 } else 8144 break; 8145 } 8146 bbr_log_type_rwnd_collapse(bbr, 8147 (bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd), 0, cleared); 8148 bbr->rc_has_collapsed = 0; 8149 } 8150 8151 /* 8152 * Return value of 1, the TCB is unlocked and most 8153 * likely gone, return value of 0, the TCB is still 8154 * locked. 8155 */ 8156 static int 8157 bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, 8158 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, 8159 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) 8160 { 8161 /* 8162 * Update window information. Don't look at window if no ACK: TAC's 8163 * send garbage on first SYN. 8164 */ 8165 uint16_t nsegs; 8166 int32_t tfo_syn; 8167 struct tcp_bbr *bbr; 8168 8169 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8170 INP_WLOCK_ASSERT(tp->t_inpcb); 8171 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8172 if ((thflags & TH_ACK) && 8173 (SEQ_LT(tp->snd_wl1, th->th_seq) || 8174 (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) || 8175 (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) { 8176 /* keep track of pure window updates */ 8177 if (tlen == 0 && 8178 tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd) 8179 KMOD_TCPSTAT_INC(tcps_rcvwinupd); 8180 tp->snd_wnd = tiwin; 8181 tp->snd_wl1 = th->th_seq; 8182 tp->snd_wl2 = th->th_ack; 8183 if (tp->snd_wnd > tp->max_sndwnd) 8184 tp->max_sndwnd = tp->snd_wnd; 8185 bbr->r_wanted_output = 1; 8186 } else if (thflags & TH_ACK) { 8187 if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) { 8188 tp->snd_wnd = tiwin; 8189 tp->snd_wl1 = th->th_seq; 8190 tp->snd_wl2 = th->th_ack; 8191 } 8192 } 8193 if (tp->snd_wnd < ctf_outstanding(tp)) 8194 /* The peer collapsed its window on us */ 8195 bbr_collapsed_window(bbr); 8196 else if (bbr->rc_has_collapsed) 8197 bbr_un_collapse_window(bbr); 8198 /* Was persist timer active and now we have window space? */ 8199 if ((bbr->rc_in_persist != 0) && 8200 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8201 bbr_minseg(bbr)))) { 8202 /* 8203 * Make the rate persist at end of persist mode if idle long 8204 * enough 8205 */ 8206 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8207 8208 /* Make sure we output to start the timer */ 8209 bbr->r_wanted_output = 1; 8210 } 8211 /* Do we need to enter persist? */ 8212 if ((bbr->rc_in_persist == 0) && 8213 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8214 TCPS_HAVEESTABLISHED(tp->t_state) && 8215 (tp->snd_max == tp->snd_una) && 8216 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8217 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8218 /* No send window.. we must enter persist */ 8219 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8220 } 8221 if (tp->t_flags2 & TF2_DROP_AF_DATA) { 8222 m_freem(m); 8223 return (0); 8224 } 8225 /* 8226 * We don't support urgent data but 8227 * drag along the up just to make sure 8228 * if there is a stack switch no one 8229 * is surprised. 8230 */ 8231 tp->rcv_up = tp->rcv_nxt; 8232 INP_WLOCK_ASSERT(tp->t_inpcb); 8233 8234 /* 8235 * Process the segment text, merging it into the TCP sequencing 8236 * queue, and arranging for acknowledgment of receipt if necessary. 8237 * This process logically involves adjusting tp->rcv_wnd as data is 8238 * presented to the user (this happens in tcp_usrreq.c, case 8239 * PRU_RCVD). If a FIN has already been received on this connection 8240 * then we just ignore the text. 8241 */ 8242 tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) && 8243 IS_FASTOPEN(tp->t_flags)); 8244 if ((tlen || (thflags & TH_FIN) || (tfo_syn && tlen > 0)) && 8245 TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8246 tcp_seq save_start = th->th_seq; 8247 tcp_seq save_rnxt = tp->rcv_nxt; 8248 int save_tlen = tlen; 8249 8250 m_adj(m, drop_hdrlen); /* delayed header drop */ 8251 /* 8252 * Insert segment which includes th into TCP reassembly 8253 * queue with control block tp. Set thflags to whether 8254 * reassembly now includes a segment with FIN. This handles 8255 * the common case inline (segment is the next to be 8256 * received on an established connection, and the queue is 8257 * empty), avoiding linkage into and removal from the queue 8258 * and repetition of various conversions. Set DELACK for 8259 * segments received in order, but ack immediately when 8260 * segments are out of order (so fast retransmit can work). 8261 */ 8262 if (th->th_seq == tp->rcv_nxt && 8263 SEGQ_EMPTY(tp) && 8264 (TCPS_HAVEESTABLISHED(tp->t_state) || 8265 tfo_syn)) { 8266 #ifdef NETFLIX_SB_LIMITS 8267 u_int mcnt, appended; 8268 8269 if (so->so_rcv.sb_shlim) { 8270 mcnt = m_memcnt(m); 8271 appended = 0; 8272 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8273 CFO_NOSLEEP, NULL) == false) { 8274 counter_u64_add(tcp_sb_shlim_fails, 1); 8275 m_freem(m); 8276 return (0); 8277 } 8278 } 8279 8280 #endif 8281 if (DELAY_ACK(tp, bbr, nsegs) || tfo_syn) { 8282 bbr->bbr_segs_rcvd += max(1, nsegs); 8283 tp->t_flags |= TF_DELACK; 8284 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8285 } else { 8286 bbr->r_wanted_output = 1; 8287 tp->t_flags |= TF_ACKNOW; 8288 } 8289 tp->rcv_nxt += tlen; 8290 if (tlen && 8291 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 8292 (tp->t_fbyte_in == 0)) { 8293 tp->t_fbyte_in = ticks; 8294 if (tp->t_fbyte_in == 0) 8295 tp->t_fbyte_in = 1; 8296 if (tp->t_fbyte_out && tp->t_fbyte_in) 8297 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 8298 } 8299 thflags = th->th_flags & TH_FIN; 8300 KMOD_TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8301 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen); 8302 SOCKBUF_LOCK(&so->so_rcv); 8303 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) 8304 m_freem(m); 8305 else 8306 #ifdef NETFLIX_SB_LIMITS 8307 appended = 8308 #endif 8309 sbappendstream_locked(&so->so_rcv, m, 0); 8310 /* NB: sorwakeup_locked() does an implicit unlock. */ 8311 sorwakeup_locked(so); 8312 #ifdef NETFLIX_SB_LIMITS 8313 if (so->so_rcv.sb_shlim && appended != mcnt) 8314 counter_fo_release(so->so_rcv.sb_shlim, 8315 mcnt - appended); 8316 #endif 8317 8318 } else { 8319 /* 8320 * XXX: Due to the header drop above "th" is 8321 * theoretically invalid by now. Fortunately 8322 * m_adj() doesn't actually frees any mbufs when 8323 * trimming from the head. 8324 */ 8325 tcp_seq temp = save_start; 8326 8327 thflags = tcp_reass(tp, th, &temp, &tlen, m); 8328 tp->t_flags |= TF_ACKNOW; 8329 if (tp->t_flags & TF_WAKESOR) { 8330 tp->t_flags &= ~TF_WAKESOR; 8331 /* NB: sorwakeup_locked() does an implicit unlock. */ 8332 sorwakeup_locked(so); 8333 } 8334 } 8335 if ((tp->t_flags & TF_SACK_PERMIT) && 8336 (save_tlen > 0) && 8337 TCPS_HAVEESTABLISHED(tp->t_state)) { 8338 if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { 8339 /* 8340 * DSACK actually handled in the fastpath 8341 * above. 8342 */ 8343 tcp_update_sack_list(tp, save_start, 8344 save_start + save_tlen); 8345 } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { 8346 if ((tp->rcv_numsacks >= 1) && 8347 (tp->sackblks[0].end == save_start)) { 8348 /* 8349 * Partial overlap, recorded at todrop 8350 * above. 8351 */ 8352 tcp_update_sack_list(tp, 8353 tp->sackblks[0].start, 8354 tp->sackblks[0].end); 8355 } else { 8356 tcp_update_dsack_list(tp, save_start, 8357 save_start + save_tlen); 8358 } 8359 } else if (tlen >= save_tlen) { 8360 /* Update of sackblks. */ 8361 tcp_update_dsack_list(tp, save_start, 8362 save_start + save_tlen); 8363 } else if (tlen > 0) { 8364 tcp_update_dsack_list(tp, save_start, 8365 save_start + tlen); 8366 } 8367 } 8368 } else { 8369 m_freem(m); 8370 thflags &= ~TH_FIN; 8371 } 8372 8373 /* 8374 * If FIN is received ACK the FIN and let the user know that the 8375 * connection is closing. 8376 */ 8377 if (thflags & TH_FIN) { 8378 if (TCPS_HAVERCVDFIN(tp->t_state) == 0) { 8379 /* The socket upcall is handled by socantrcvmore. */ 8380 socantrcvmore(so); 8381 /* 8382 * If connection is half-synchronized (ie NEEDSYN 8383 * flag on) then delay ACK, so it may be piggybacked 8384 * when SYN is sent. Otherwise, since we received a 8385 * FIN then no more input can be expected, send ACK 8386 * now. 8387 */ 8388 if (tp->t_flags & TF_NEEDSYN) { 8389 tp->t_flags |= TF_DELACK; 8390 bbr_timer_cancel(bbr, 8391 __LINE__, bbr->r_ctl.rc_rcvtime); 8392 } else { 8393 tp->t_flags |= TF_ACKNOW; 8394 } 8395 tp->rcv_nxt++; 8396 } 8397 switch (tp->t_state) { 8398 /* 8399 * In SYN_RECEIVED and ESTABLISHED STATES enter the 8400 * CLOSE_WAIT state. 8401 */ 8402 case TCPS_SYN_RECEIVED: 8403 tp->t_starttime = ticks; 8404 /* FALLTHROUGH */ 8405 case TCPS_ESTABLISHED: 8406 tcp_state_change(tp, TCPS_CLOSE_WAIT); 8407 break; 8408 8409 /* 8410 * If still in FIN_WAIT_1 STATE FIN has not been 8411 * acked so enter the CLOSING state. 8412 */ 8413 case TCPS_FIN_WAIT_1: 8414 tcp_state_change(tp, TCPS_CLOSING); 8415 break; 8416 8417 /* 8418 * In FIN_WAIT_2 state enter the TIME_WAIT state, 8419 * starting the time-wait timer, turning off the 8420 * other standard timers. 8421 */ 8422 case TCPS_FIN_WAIT_2: 8423 bbr->rc_timer_first = 1; 8424 bbr_timer_cancel(bbr, 8425 __LINE__, bbr->r_ctl.rc_rcvtime); 8426 INP_WLOCK_ASSERT(tp->t_inpcb); 8427 tcp_twstart(tp); 8428 return (1); 8429 } 8430 } 8431 /* 8432 * Return any desired output. 8433 */ 8434 if ((tp->t_flags & TF_ACKNOW) || 8435 (sbavail(&so->so_snd) > ctf_outstanding(tp))) { 8436 bbr->r_wanted_output = 1; 8437 } 8438 INP_WLOCK_ASSERT(tp->t_inpcb); 8439 return (0); 8440 } 8441 8442 /* 8443 * Here nothing is really faster, its just that we 8444 * have broken out the fast-data path also just like 8445 * the fast-ack. Return 1 if we processed the packet 8446 * return 0 if you need to take the "slow-path". 8447 */ 8448 static int 8449 bbr_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, 8450 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8451 uint32_t tiwin, int32_t nxt_pkt) 8452 { 8453 uint16_t nsegs; 8454 int32_t newsize = 0; /* automatic sockbuf scaling */ 8455 struct tcp_bbr *bbr; 8456 #ifdef NETFLIX_SB_LIMITS 8457 u_int mcnt, appended; 8458 #endif 8459 #ifdef TCPDEBUG 8460 /* 8461 * The size of tcp_saveipgen must be the size of the max ip header, 8462 * now IPv6. 8463 */ 8464 u_char tcp_saveipgen[IP6_HDR_LEN]; 8465 struct tcphdr tcp_savetcp; 8466 short ostate = 0; 8467 8468 #endif 8469 /* On the hpts and we would have called output */ 8470 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8471 8472 /* 8473 * If last ACK falls within this segment's sequence numbers, record 8474 * the timestamp. NOTE that the test is modified according to the 8475 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8476 */ 8477 if (bbr->r_ctl.rc_resend != NULL) { 8478 return (0); 8479 } 8480 if (tiwin && tiwin != tp->snd_wnd) { 8481 return (0); 8482 } 8483 if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) { 8484 return (0); 8485 } 8486 if (__predict_false((to->to_flags & TOF_TS) && 8487 (TSTMP_LT(to->to_tsval, tp->ts_recent)))) { 8488 return (0); 8489 } 8490 if (__predict_false((th->th_ack != tp->snd_una))) { 8491 return (0); 8492 } 8493 if (__predict_false(tlen > sbspace(&so->so_rcv))) { 8494 return (0); 8495 } 8496 if ((to->to_flags & TOF_TS) != 0 && 8497 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8498 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 8499 tp->ts_recent = to->to_tsval; 8500 } 8501 /* 8502 * This is a pure, in-sequence data packet with nothing on the 8503 * reassembly queue and we have enough buffer space to take it. 8504 */ 8505 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8506 8507 #ifdef NETFLIX_SB_LIMITS 8508 if (so->so_rcv.sb_shlim) { 8509 mcnt = m_memcnt(m); 8510 appended = 0; 8511 if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, 8512 CFO_NOSLEEP, NULL) == false) { 8513 counter_u64_add(tcp_sb_shlim_fails, 1); 8514 m_freem(m); 8515 return (1); 8516 } 8517 } 8518 #endif 8519 /* Clean receiver SACK report if present */ 8520 if (tp->rcv_numsacks) 8521 tcp_clean_sackreport(tp); 8522 KMOD_TCPSTAT_INC(tcps_preddat); 8523 tp->rcv_nxt += tlen; 8524 if (tlen && 8525 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 8526 (tp->t_fbyte_in == 0)) { 8527 tp->t_fbyte_in = ticks; 8528 if (tp->t_fbyte_in == 0) 8529 tp->t_fbyte_in = 1; 8530 if (tp->t_fbyte_out && tp->t_fbyte_in) 8531 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 8532 } 8533 /* 8534 * Pull snd_wl1 up to prevent seq wrap relative to th_seq. 8535 */ 8536 tp->snd_wl1 = th->th_seq; 8537 /* 8538 * Pull rcv_up up to prevent seq wrap relative to rcv_nxt. 8539 */ 8540 tp->rcv_up = tp->rcv_nxt; 8541 KMOD_TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); 8542 KMOD_TCPSTAT_ADD(tcps_rcvbyte, tlen); 8543 #ifdef TCPDEBUG 8544 if (so->so_options & SO_DEBUG) 8545 tcp_trace(TA_INPUT, ostate, tp, 8546 (void *)tcp_saveipgen, &tcp_savetcp, 0); 8547 #endif 8548 newsize = tcp_autorcvbuf(m, th, so, tp, tlen); 8549 8550 /* Add data to socket buffer. */ 8551 SOCKBUF_LOCK(&so->so_rcv); 8552 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 8553 m_freem(m); 8554 } else { 8555 /* 8556 * Set new socket buffer size. Give up when limit is 8557 * reached. 8558 */ 8559 if (newsize) 8560 if (!sbreserve_locked(&so->so_rcv, 8561 newsize, so, NULL)) 8562 so->so_rcv.sb_flags &= ~SB_AUTOSIZE; 8563 m_adj(m, drop_hdrlen); /* delayed header drop */ 8564 8565 #ifdef NETFLIX_SB_LIMITS 8566 appended = 8567 #endif 8568 sbappendstream_locked(&so->so_rcv, m, 0); 8569 ctf_calc_rwin(so, tp); 8570 } 8571 /* NB: sorwakeup_locked() does an implicit unlock. */ 8572 sorwakeup_locked(so); 8573 #ifdef NETFLIX_SB_LIMITS 8574 if (so->so_rcv.sb_shlim && mcnt != appended) 8575 counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended); 8576 #endif 8577 if (DELAY_ACK(tp, bbr, nsegs)) { 8578 bbr->bbr_segs_rcvd += max(1, nsegs); 8579 tp->t_flags |= TF_DELACK; 8580 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8581 } else { 8582 bbr->r_wanted_output = 1; 8583 tp->t_flags |= TF_ACKNOW; 8584 } 8585 return (1); 8586 } 8587 8588 /* 8589 * This subfunction is used to try to highly optimize the 8590 * fast path. We again allow window updates that are 8591 * in sequence to remain in the fast-path. We also add 8592 * in the __predict's to attempt to help the compiler. 8593 * Note that if we return a 0, then we can *not* process 8594 * it and the caller should push the packet into the 8595 * slow-path. If we return 1, then all is well and 8596 * the packet is fully processed. 8597 */ 8598 static int 8599 bbr_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 8600 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8601 uint32_t tiwin, int32_t nxt_pkt, uint8_t iptos) 8602 { 8603 int32_t acked; 8604 uint16_t nsegs; 8605 uint32_t sack_changed; 8606 #ifdef TCPDEBUG 8607 /* 8608 * The size of tcp_saveipgen must be the size of the max ip header, 8609 * now IPv6. 8610 */ 8611 u_char tcp_saveipgen[IP6_HDR_LEN]; 8612 struct tcphdr tcp_savetcp; 8613 short ostate = 0; 8614 8615 #endif 8616 uint32_t prev_acked = 0; 8617 struct tcp_bbr *bbr; 8618 8619 if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { 8620 /* Old ack, behind (or duplicate to) the last one rcv'd */ 8621 return (0); 8622 } 8623 if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) { 8624 /* Above what we have sent? */ 8625 return (0); 8626 } 8627 if (__predict_false(tiwin == 0)) { 8628 /* zero window */ 8629 return (0); 8630 } 8631 if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) { 8632 /* We need a SYN or a FIN, unlikely.. */ 8633 return (0); 8634 } 8635 if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) { 8636 /* Timestamp is behind .. old ack with seq wrap? */ 8637 return (0); 8638 } 8639 if (__predict_false(IN_RECOVERY(tp->t_flags))) { 8640 /* Still recovering */ 8641 return (0); 8642 } 8643 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8644 if (__predict_false(bbr->r_ctl.rc_resend != NULL)) { 8645 /* We are retransmitting */ 8646 return (0); 8647 } 8648 if (__predict_false(bbr->rc_in_persist != 0)) { 8649 /* In persist mode */ 8650 return (0); 8651 } 8652 if (bbr->r_ctl.rc_sacked) { 8653 /* We have sack holes on our scoreboard */ 8654 return (0); 8655 } 8656 /* Ok if we reach here, we can process a fast-ack */ 8657 nsegs = max(1, m->m_pkthdr.lro_nsegs); 8658 sack_changed = bbr_log_ack(tp, to, th, &prev_acked); 8659 /* 8660 * We never detect loss in fast ack [we can't 8661 * have a sack and can't be in recovery so 8662 * we always pass 0 (nothing detected)]. 8663 */ 8664 bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, 0); 8665 /* Did the window get updated? */ 8666 if (tiwin != tp->snd_wnd) { 8667 tp->snd_wnd = tiwin; 8668 tp->snd_wl1 = th->th_seq; 8669 if (tp->snd_wnd > tp->max_sndwnd) 8670 tp->max_sndwnd = tp->snd_wnd; 8671 } 8672 /* Do we need to exit persists? */ 8673 if ((bbr->rc_in_persist != 0) && 8674 (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), 8675 bbr_minseg(bbr)))) { 8676 bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8677 bbr->r_wanted_output = 1; 8678 } 8679 /* Do we need to enter persists? */ 8680 if ((bbr->rc_in_persist == 0) && 8681 (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 8682 TCPS_HAVEESTABLISHED(tp->t_state) && 8683 (tp->snd_max == tp->snd_una) && 8684 sbavail(&tp->t_inpcb->inp_socket->so_snd) && 8685 (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { 8686 /* No send window.. we must enter persist */ 8687 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 8688 } 8689 /* 8690 * If last ACK falls within this segment's sequence numbers, record 8691 * the timestamp. NOTE that the test is modified according to the 8692 * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). 8693 */ 8694 if ((to->to_flags & TOF_TS) != 0 && 8695 SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { 8696 tp->ts_recent_age = bbr->r_ctl.rc_rcvtime; 8697 tp->ts_recent = to->to_tsval; 8698 } 8699 /* 8700 * This is a pure ack for outstanding data. 8701 */ 8702 KMOD_TCPSTAT_INC(tcps_predack); 8703 8704 /* 8705 * "bad retransmit" recovery. 8706 */ 8707 if (tp->t_flags & TF_PREVVALID) { 8708 tp->t_flags &= ~TF_PREVVALID; 8709 if (tp->t_rxtshift == 1 && 8710 (int)(ticks - tp->t_badrxtwin) < 0) 8711 bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); 8712 } 8713 /* 8714 * Recalculate the transmit timer / rtt. 8715 * 8716 * Some boxes send broken timestamp replies during the SYN+ACK 8717 * phase, ignore timestamps of 0 or we could calculate a huge RTT 8718 * and blow up the retransmit timer. 8719 */ 8720 acked = BYTES_THIS_ACK(tp, th); 8721 8722 #ifdef TCP_HHOOK 8723 /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */ 8724 hhook_run_tcp_est_in(tp, th, to); 8725 #endif 8726 8727 KMOD_TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); 8728 KMOD_TCPSTAT_ADD(tcps_rcvackbyte, acked); 8729 sbdrop(&so->so_snd, acked); 8730 8731 if (SEQ_GT(th->th_ack, tp->snd_una)) 8732 bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); 8733 tp->snd_una = th->th_ack; 8734 if (tp->snd_wnd < ctf_outstanding(tp)) 8735 /* The peer collapsed its window on us */ 8736 bbr_collapsed_window(bbr); 8737 else if (bbr->rc_has_collapsed) 8738 bbr_un_collapse_window(bbr); 8739 8740 if (SEQ_GT(tp->snd_una, tp->snd_recover)) { 8741 tp->snd_recover = tp->snd_una; 8742 } 8743 bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, 0); 8744 /* 8745 * Pull snd_wl2 up to prevent seq wrap relative to th_ack. 8746 */ 8747 tp->snd_wl2 = th->th_ack; 8748 m_freem(m); 8749 /* 8750 * If all outstanding data are acked, stop retransmit timer, 8751 * otherwise restart timer using current (possibly backed-off) 8752 * value. If process is waiting for space, wakeup/selwakeup/signal. 8753 * If data are ready to send, let tcp_output decide between more 8754 * output or persist. 8755 */ 8756 #ifdef TCPDEBUG 8757 if (so->so_options & SO_DEBUG) 8758 tcp_trace(TA_INPUT, ostate, tp, 8759 (void *)tcp_saveipgen, 8760 &tcp_savetcp, 0); 8761 #endif 8762 /* Wake up the socket if we have room to write more */ 8763 sowwakeup(so); 8764 if (tp->snd_una == tp->snd_max) { 8765 /* Nothing left outstanding */ 8766 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); 8767 if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) 8768 bbr->rc_tp->t_acktime = 0; 8769 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8770 if (bbr->rc_in_persist == 0) { 8771 bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; 8772 } 8773 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 8774 bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); 8775 /* 8776 * We invalidate the last ack here since we 8777 * don't want to transfer forward the time 8778 * for our sum's calculations. 8779 */ 8780 bbr->r_wanted_output = 1; 8781 } 8782 if (sbavail(&so->so_snd)) { 8783 bbr->r_wanted_output = 1; 8784 } 8785 return (1); 8786 } 8787 8788 /* 8789 * Return value of 1, the TCB is unlocked and most 8790 * likely gone, return value of 0, the TCB is still 8791 * locked. 8792 */ 8793 static int 8794 bbr_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, 8795 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 8796 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 8797 { 8798 int32_t todrop; 8799 int32_t ourfinisacked = 0; 8800 struct tcp_bbr *bbr; 8801 int32_t ret_val = 0; 8802 8803 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 8804 ctf_calc_rwin(so, tp); 8805 /* 8806 * If the state is SYN_SENT: if seg contains an ACK, but not for our 8807 * SYN, drop the input. if seg contains a RST, then drop the 8808 * connection. if seg does not contain SYN, then drop it. Otherwise 8809 * this is an acceptable SYN segment initialize tp->rcv_nxt and 8810 * tp->irs if seg contains ack then advance tp->snd_una. BRR does 8811 * not support ECN so we will not say we are capable. if SYN has 8812 * been acked change to ESTABLISHED else SYN_RCVD state arrange for 8813 * segment to be acked (eventually) continue processing rest of 8814 * data/controls, beginning with URG 8815 */ 8816 if ((thflags & TH_ACK) && 8817 (SEQ_LEQ(th->th_ack, tp->iss) || 8818 SEQ_GT(th->th_ack, tp->snd_max))) { 8819 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 8820 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 8821 return (1); 8822 } 8823 if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) { 8824 TCP_PROBE5(connect__refused, NULL, tp, 8825 mtod(m, const char *), tp, th); 8826 tp = tcp_drop(tp, ECONNREFUSED); 8827 ctf_do_drop(m, tp); 8828 return (1); 8829 } 8830 if (thflags & TH_RST) { 8831 ctf_do_drop(m, tp); 8832 return (1); 8833 } 8834 if (!(thflags & TH_SYN)) { 8835 ctf_do_drop(m, tp); 8836 return (1); 8837 } 8838 tp->irs = th->th_seq; 8839 tcp_rcvseqinit(tp); 8840 if (thflags & TH_ACK) { 8841 int tfo_partial = 0; 8842 8843 KMOD_TCPSTAT_INC(tcps_connects); 8844 soisconnected(so); 8845 #ifdef MAC 8846 mac_socketpeer_set_from_mbuf(m, so); 8847 #endif 8848 /* Do window scaling on this connection? */ 8849 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 8850 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 8851 tp->rcv_scale = tp->request_r_scale; 8852 } 8853 tp->rcv_adv += min(tp->rcv_wnd, 8854 TCP_MAXWIN << tp->rcv_scale); 8855 /* 8856 * If not all the data that was sent in the TFO SYN 8857 * has been acked, resend the remainder right away. 8858 */ 8859 if (IS_FASTOPEN(tp->t_flags) && 8860 (tp->snd_una != tp->snd_max)) { 8861 tp->snd_nxt = th->th_ack; 8862 tfo_partial = 1; 8863 } 8864 /* 8865 * If there's data, delay ACK; if there's also a FIN ACKNOW 8866 * will be turned on later. 8867 */ 8868 if (DELAY_ACK(tp, bbr, 1) && tlen != 0 && !tfo_partial) { 8869 bbr->bbr_segs_rcvd += 1; 8870 tp->t_flags |= TF_DELACK; 8871 bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); 8872 } else { 8873 bbr->r_wanted_output = 1; 8874 tp->t_flags |= TF_ACKNOW; 8875 } 8876 if (SEQ_GT(th->th_ack, tp->iss)) { 8877 /* 8878 * The SYN is acked 8879 * handle it specially. 8880 */ 8881 bbr_log_syn(tp, to); 8882 } 8883 if (SEQ_GT(th->th_ack, tp->snd_una)) { 8884 /* 8885 * We advance snd_una for the 8886 * fast open case. If th_ack is 8887 * acknowledging data beyond 8888 * snd_una we can't just call 8889 * ack-processing since the 8890 * data stream in our send-map 8891 * will start at snd_una + 1 (one 8892 * beyond the SYN). If its just 8893 * equal we don't need to do that 8894 * and there is no send_map. 8895 */ 8896 tp->snd_una++; 8897 } 8898 /* 8899 * Received <SYN,ACK> in SYN_SENT[*] state. Transitions: 8900 * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1 8901 */ 8902 tp->t_starttime = ticks; 8903 if (tp->t_flags & TF_NEEDFIN) { 8904 tcp_state_change(tp, TCPS_FIN_WAIT_1); 8905 tp->t_flags &= ~TF_NEEDFIN; 8906 thflags &= ~TH_SYN; 8907 } else { 8908 tcp_state_change(tp, TCPS_ESTABLISHED); 8909 TCP_PROBE5(connect__established, NULL, tp, 8910 mtod(m, const char *), tp, th); 8911 cc_conn_init(tp); 8912 } 8913 } else { 8914 /* 8915 * Received initial SYN in SYN-SENT[*] state => simultaneous 8916 * open. If segment contains CC option and there is a 8917 * cached CC, apply TAO test. If it succeeds, connection is * 8918 * half-synchronized. Otherwise, do 3-way handshake: 8919 * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If 8920 * there was no CC option, clear cached CC value. 8921 */ 8922 tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN); 8923 tcp_state_change(tp, TCPS_SYN_RECEIVED); 8924 } 8925 INP_WLOCK_ASSERT(tp->t_inpcb); 8926 /* 8927 * Advance th->th_seq to correspond to first data byte. If data, 8928 * trim to stay within window, dropping FIN if necessary. 8929 */ 8930 th->th_seq++; 8931 if (tlen > tp->rcv_wnd) { 8932 todrop = tlen - tp->rcv_wnd; 8933 m_adj(m, -todrop); 8934 tlen = tp->rcv_wnd; 8935 thflags &= ~TH_FIN; 8936 KMOD_TCPSTAT_INC(tcps_rcvpackafterwin); 8937 KMOD_TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop); 8938 } 8939 tp->snd_wl1 = th->th_seq - 1; 8940 tp->rcv_up = th->th_seq; 8941 /* 8942 * Client side of transaction: already sent SYN and data. If the 8943 * remote host used T/TCP to validate the SYN, our data will be 8944 * ACK'd; if so, enter normal data segment processing in the middle 8945 * of step 5, ack processing. Otherwise, goto step 6. 8946 */ 8947 if (thflags & TH_ACK) { 8948 if ((to->to_flags & TOF_TS) != 0) { 8949 uint32_t t, rtt; 8950 8951 t = tcp_tv_to_mssectick(&bbr->rc_tv); 8952 if (TSTMP_GEQ(t, to->to_tsecr)) { 8953 rtt = t - to->to_tsecr; 8954 if (rtt == 0) { 8955 rtt = 1; 8956 } 8957 rtt *= MS_IN_USEC; 8958 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 8959 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, 8960 rtt, bbr->r_ctl.rc_rcvtime); 8961 } 8962 } 8963 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) 8964 return (ret_val); 8965 /* We may have changed to FIN_WAIT_1 above */ 8966 if (tp->t_state == TCPS_FIN_WAIT_1) { 8967 /* 8968 * In FIN_WAIT_1 STATE in addition to the processing 8969 * for the ESTABLISHED state if our FIN is now 8970 * acknowledged then enter FIN_WAIT_2. 8971 */ 8972 if (ourfinisacked) { 8973 /* 8974 * If we can't receive any more data, then 8975 * closing user can proceed. Starting the 8976 * timer is contrary to the specification, 8977 * but if we don't get a FIN we'll hang 8978 * forever. 8979 * 8980 * XXXjl: we should release the tp also, and 8981 * use a compressed state. 8982 */ 8983 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 8984 soisdisconnected(so); 8985 tcp_timer_activate(tp, TT_2MSL, 8986 (tcp_fast_finwait2_recycle ? 8987 tcp_finwait2_timeout : 8988 TP_MAXIDLE(tp))); 8989 } 8990 tcp_state_change(tp, TCPS_FIN_WAIT_2); 8991 } 8992 } 8993 } 8994 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 8995 tiwin, thflags, nxt_pkt)); 8996 } 8997 8998 /* 8999 * Return value of 1, the TCB is unlocked and most 9000 * likely gone, return value of 0, the TCB is still 9001 * locked. 9002 */ 9003 static int 9004 bbr_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, 9005 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9006 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9007 { 9008 int32_t ourfinisacked = 0; 9009 int32_t ret_val; 9010 struct tcp_bbr *bbr; 9011 9012 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9013 ctf_calc_rwin(so, tp); 9014 if ((thflags & TH_ACK) && 9015 (SEQ_LEQ(th->th_ack, tp->snd_una) || 9016 SEQ_GT(th->th_ack, tp->snd_max))) { 9017 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9018 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9019 return (1); 9020 } 9021 if (IS_FASTOPEN(tp->t_flags)) { 9022 /* 9023 * When a TFO connection is in SYN_RECEIVED, the only valid 9024 * packets are the initial SYN, a retransmit/copy of the 9025 * initial SYN (possibly with a subset of the original 9026 * data), a valid ACK, a FIN, or a RST. 9027 */ 9028 if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) { 9029 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9030 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9031 return (1); 9032 } else if (thflags & TH_SYN) { 9033 /* non-initial SYN is ignored */ 9034 if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RXT) || 9035 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_TLP) || 9036 (bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) { 9037 ctf_do_drop(m, NULL); 9038 return (0); 9039 } 9040 } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) { 9041 ctf_do_drop(m, NULL); 9042 return (0); 9043 } 9044 } 9045 if ((thflags & TH_RST) || 9046 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9047 return (ctf_process_rst(m, th, so, tp)); 9048 /* 9049 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9050 * it's less than ts_recent, drop it. 9051 */ 9052 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9053 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9054 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9055 return (ret_val); 9056 } 9057 /* 9058 * In the SYN-RECEIVED state, validate that the packet belongs to 9059 * this connection before trimming the data to fit the receive 9060 * window. Check the sequence number versus IRS since we know the 9061 * sequence numbers haven't wrapped. This is a partial fix for the 9062 * "LAND" DoS attack. 9063 */ 9064 if (SEQ_LT(th->th_seq, tp->irs)) { 9065 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 9066 ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9067 return (1); 9068 } 9069 INP_WLOCK_ASSERT(tp->t_inpcb); 9070 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9071 return (ret_val); 9072 } 9073 /* 9074 * If last ACK falls within this segment's sequence numbers, record 9075 * its timestamp. NOTE: 1) That the test incorporates suggestions 9076 * from the latest proposal of the tcplw@cray.com list (Braden 9077 * 1993/04/26). 2) That updating only on newer timestamps interferes 9078 * with our earlier PAWS tests, so this check should be solely 9079 * predicated on the sequence space of this segment. 3) That we 9080 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9081 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9082 * SEG.Len, This modified check allows us to overcome RFC1323's 9083 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9084 * p.869. In such cases, we can still calculate the RTT correctly 9085 * when RCV.NXT == Last.ACK.Sent. 9086 */ 9087 if ((to->to_flags & TOF_TS) != 0 && 9088 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9089 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9090 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9091 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9092 tp->ts_recent = to->to_tsval; 9093 } 9094 tp->snd_wnd = tiwin; 9095 /* 9096 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9097 * is on (half-synchronized state), then queue data for later 9098 * processing; else drop segment and return. 9099 */ 9100 if ((thflags & TH_ACK) == 0) { 9101 if (IS_FASTOPEN(tp->t_flags)) { 9102 cc_conn_init(tp); 9103 } 9104 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9105 tiwin, thflags, nxt_pkt)); 9106 } 9107 KMOD_TCPSTAT_INC(tcps_connects); 9108 soisconnected(so); 9109 /* Do window scaling? */ 9110 if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == 9111 (TF_RCVD_SCALE | TF_REQ_SCALE)) { 9112 tp->rcv_scale = tp->request_r_scale; 9113 } 9114 /* 9115 * ok for the first time in lets see if we can use the ts to figure 9116 * out what the initial RTT was. 9117 */ 9118 if ((to->to_flags & TOF_TS) != 0) { 9119 uint32_t t, rtt; 9120 9121 t = tcp_tv_to_mssectick(&bbr->rc_tv); 9122 if (TSTMP_GEQ(t, to->to_tsecr)) { 9123 rtt = t - to->to_tsecr; 9124 if (rtt == 0) { 9125 rtt = 1; 9126 } 9127 rtt *= MS_IN_USEC; 9128 tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); 9129 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, bbr->r_ctl.rc_rcvtime); 9130 } 9131 } 9132 /* Drop off any SYN in the send map (probably not there) */ 9133 if (thflags & TH_ACK) 9134 bbr_log_syn(tp, to); 9135 if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) { 9136 tcp_fastopen_decrement_counter(tp->t_tfo_pending); 9137 tp->t_tfo_pending = NULL; 9138 } 9139 /* 9140 * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* -> 9141 * FIN-WAIT-1 9142 */ 9143 tp->t_starttime = ticks; 9144 if (tp->t_flags & TF_NEEDFIN) { 9145 tcp_state_change(tp, TCPS_FIN_WAIT_1); 9146 tp->t_flags &= ~TF_NEEDFIN; 9147 } else { 9148 tcp_state_change(tp, TCPS_ESTABLISHED); 9149 TCP_PROBE5(accept__established, NULL, tp, 9150 mtod(m, const char *), tp, th); 9151 /* 9152 * TFO connections call cc_conn_init() during SYN 9153 * processing. Calling it again here for such connections 9154 * is not harmless as it would undo the snd_cwnd reduction 9155 * that occurs when a TFO SYN|ACK is retransmitted. 9156 */ 9157 if (!IS_FASTOPEN(tp->t_flags)) 9158 cc_conn_init(tp); 9159 } 9160 /* 9161 * Account for the ACK of our SYN prior to 9162 * regular ACK processing below, except for 9163 * simultaneous SYN, which is handled later. 9164 */ 9165 if (SEQ_GT(th->th_ack, tp->snd_una) && !(tp->t_flags & TF_NEEDSYN)) 9166 tp->snd_una++; 9167 /* 9168 * If segment contains data or ACK, will call tcp_reass() later; if 9169 * not, do so now to pass queued data to user. 9170 */ 9171 if (tlen == 0 && (thflags & TH_FIN) == 0) { 9172 (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0, 9173 (struct mbuf *)0); 9174 if (tp->t_flags & TF_WAKESOR) { 9175 tp->t_flags &= ~TF_WAKESOR; 9176 /* NB: sorwakeup_locked() does an implicit unlock. */ 9177 sorwakeup_locked(so); 9178 } 9179 } 9180 tp->snd_wl1 = th->th_seq - 1; 9181 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9182 return (ret_val); 9183 } 9184 if (tp->t_state == TCPS_FIN_WAIT_1) { 9185 /* We could have went to FIN_WAIT_1 (or EST) above */ 9186 /* 9187 * In FIN_WAIT_1 STATE in addition to the processing for the 9188 * ESTABLISHED state if our FIN is now acknowledged then 9189 * enter FIN_WAIT_2. 9190 */ 9191 if (ourfinisacked) { 9192 /* 9193 * If we can't receive any more data, then closing 9194 * user can proceed. Starting the timer is contrary 9195 * to the specification, but if we don't get a FIN 9196 * we'll hang forever. 9197 * 9198 * XXXjl: we should release the tp also, and use a 9199 * compressed state. 9200 */ 9201 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9202 soisdisconnected(so); 9203 tcp_timer_activate(tp, TT_2MSL, 9204 (tcp_fast_finwait2_recycle ? 9205 tcp_finwait2_timeout : 9206 TP_MAXIDLE(tp))); 9207 } 9208 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9209 } 9210 } 9211 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9212 tiwin, thflags, nxt_pkt)); 9213 } 9214 9215 /* 9216 * Return value of 1, the TCB is unlocked and most 9217 * likely gone, return value of 0, the TCB is still 9218 * locked. 9219 */ 9220 static int 9221 bbr_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, 9222 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9223 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9224 { 9225 struct tcp_bbr *bbr; 9226 int32_t ret_val; 9227 9228 /* 9229 * Header prediction: check for the two common cases of a 9230 * uni-directional data xfer. If the packet has no control flags, 9231 * is in-sequence, the window didn't change and we're not 9232 * retransmitting, it's a candidate. If the length is zero and the 9233 * ack moved forward, we're the sender side of the xfer. Just free 9234 * the data acked & wake any higher level process that was blocked 9235 * waiting for space. If the length is non-zero and the ack didn't 9236 * move, we're the receiver side. If we're getting packets in-order 9237 * (the reassembly queue is empty), add the data toc The socket 9238 * buffer and note that we need a delayed ack. Make sure that the 9239 * hidden state-flags are also off. Since we check for 9240 * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN. 9241 */ 9242 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9243 if (bbr->r_ctl.rc_delivered < (4 * tp->t_maxseg)) { 9244 /* 9245 * If we have delived under 4 segments increase the initial 9246 * window if raised by the peer. We use this to determine 9247 * dynamic and static rwnd's at the end of a connection. 9248 */ 9249 bbr->r_ctl.rc_init_rwnd = max(tiwin, tp->snd_wnd); 9250 } 9251 if (__predict_true(((to->to_flags & TOF_SACK) == 0)) && 9252 __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_URG | TH_ACK)) == TH_ACK) && 9253 __predict_true(SEGQ_EMPTY(tp)) && 9254 __predict_true(th->th_seq == tp->rcv_nxt)) { 9255 if (tlen == 0) { 9256 if (bbr_fastack(m, th, so, tp, to, drop_hdrlen, tlen, 9257 tiwin, nxt_pkt, iptos)) { 9258 return (0); 9259 } 9260 } else { 9261 if (bbr_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen, 9262 tiwin, nxt_pkt)) { 9263 return (0); 9264 } 9265 } 9266 } 9267 ctf_calc_rwin(so, tp); 9268 9269 if ((thflags & TH_RST) || 9270 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9271 return (ctf_process_rst(m, th, so, tp)); 9272 /* 9273 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9274 * synchronized state. 9275 */ 9276 if (thflags & TH_SYN) { 9277 ctf_challenge_ack(m, th, tp, &ret_val); 9278 return (ret_val); 9279 } 9280 /* 9281 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9282 * it's less than ts_recent, drop it. 9283 */ 9284 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9285 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9286 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9287 return (ret_val); 9288 } 9289 INP_WLOCK_ASSERT(tp->t_inpcb); 9290 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9291 return (ret_val); 9292 } 9293 /* 9294 * If last ACK falls within this segment's sequence numbers, record 9295 * its timestamp. NOTE: 1) That the test incorporates suggestions 9296 * from the latest proposal of the tcplw@cray.com list (Braden 9297 * 1993/04/26). 2) That updating only on newer timestamps interferes 9298 * with our earlier PAWS tests, so this check should be solely 9299 * predicated on the sequence space of this segment. 3) That we 9300 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9301 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9302 * SEG.Len, This modified check allows us to overcome RFC1323's 9303 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9304 * p.869. In such cases, we can still calculate the RTT correctly 9305 * when RCV.NXT == Last.ACK.Sent. 9306 */ 9307 if ((to->to_flags & TOF_TS) != 0 && 9308 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9309 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9310 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9311 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9312 tp->ts_recent = to->to_tsval; 9313 } 9314 /* 9315 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9316 * is on (half-synchronized state), then queue data for later 9317 * processing; else drop segment and return. 9318 */ 9319 if ((thflags & TH_ACK) == 0) { 9320 if (tp->t_flags & TF_NEEDSYN) { 9321 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9322 tiwin, thflags, nxt_pkt)); 9323 } else if (tp->t_flags & TF_ACKNOW) { 9324 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9325 bbr->r_wanted_output = 1; 9326 return (ret_val); 9327 } else { 9328 ctf_do_drop(m, NULL); 9329 return (0); 9330 } 9331 } 9332 /* 9333 * Ack processing. 9334 */ 9335 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9336 return (ret_val); 9337 } 9338 if (sbavail(&so->so_snd)) { 9339 if (ctf_progress_timeout_check(tp, true)) { 9340 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9341 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9342 return (1); 9343 } 9344 } 9345 /* State changes only happen in bbr_process_data() */ 9346 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9347 tiwin, thflags, nxt_pkt)); 9348 } 9349 9350 /* 9351 * Return value of 1, the TCB is unlocked and most 9352 * likely gone, return value of 0, the TCB is still 9353 * locked. 9354 */ 9355 static int 9356 bbr_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, 9357 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9358 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9359 { 9360 struct tcp_bbr *bbr; 9361 int32_t ret_val; 9362 9363 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9364 ctf_calc_rwin(so, tp); 9365 if ((thflags & TH_RST) || 9366 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9367 return (ctf_process_rst(m, th, so, tp)); 9368 /* 9369 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9370 * synchronized state. 9371 */ 9372 if (thflags & TH_SYN) { 9373 ctf_challenge_ack(m, th, tp, &ret_val); 9374 return (ret_val); 9375 } 9376 /* 9377 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9378 * it's less than ts_recent, drop it. 9379 */ 9380 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9381 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9382 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9383 return (ret_val); 9384 } 9385 INP_WLOCK_ASSERT(tp->t_inpcb); 9386 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9387 return (ret_val); 9388 } 9389 /* 9390 * If last ACK falls within this segment's sequence numbers, record 9391 * its timestamp. NOTE: 1) That the test incorporates suggestions 9392 * from the latest proposal of the tcplw@cray.com list (Braden 9393 * 1993/04/26). 2) That updating only on newer timestamps interferes 9394 * with our earlier PAWS tests, so this check should be solely 9395 * predicated on the sequence space of this segment. 3) That we 9396 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9397 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9398 * SEG.Len, This modified check allows us to overcome RFC1323's 9399 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9400 * p.869. In such cases, we can still calculate the RTT correctly 9401 * when RCV.NXT == Last.ACK.Sent. 9402 */ 9403 if ((to->to_flags & TOF_TS) != 0 && 9404 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9405 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9406 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9407 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9408 tp->ts_recent = to->to_tsval; 9409 } 9410 /* 9411 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9412 * is on (half-synchronized state), then queue data for later 9413 * processing; else drop segment and return. 9414 */ 9415 if ((thflags & TH_ACK) == 0) { 9416 if (tp->t_flags & TF_NEEDSYN) { 9417 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9418 tiwin, thflags, nxt_pkt)); 9419 } else if (tp->t_flags & TF_ACKNOW) { 9420 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9421 bbr->r_wanted_output = 1; 9422 return (ret_val); 9423 } else { 9424 ctf_do_drop(m, NULL); 9425 return (0); 9426 } 9427 } 9428 /* 9429 * Ack processing. 9430 */ 9431 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { 9432 return (ret_val); 9433 } 9434 if (sbavail(&so->so_snd)) { 9435 if (ctf_progress_timeout_check(tp, true)) { 9436 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9437 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9438 return (1); 9439 } 9440 } 9441 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9442 tiwin, thflags, nxt_pkt)); 9443 } 9444 9445 static int 9446 bbr_check_data_after_close(struct mbuf *m, struct tcp_bbr *bbr, 9447 struct tcpcb *tp, int32_t * tlen, struct tcphdr *th, struct socket *so) 9448 { 9449 9450 if (bbr->rc_allow_data_af_clo == 0) { 9451 close_now: 9452 tcp_log_end_status(tp, TCP_EI_STATUS_DATA_A_CLOSE); 9453 /* tcp_close will kill the inp pre-log the Reset */ 9454 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 9455 tp = tcp_close(tp); 9456 KMOD_TCPSTAT_INC(tcps_rcvafterclose); 9457 ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); 9458 return (1); 9459 } 9460 if (sbavail(&so->so_snd) == 0) 9461 goto close_now; 9462 /* Ok we allow data that is ignored and a followup reset */ 9463 tp->rcv_nxt = th->th_seq + *tlen; 9464 tp->t_flags2 |= TF2_DROP_AF_DATA; 9465 bbr->r_wanted_output = 1; 9466 *tlen = 0; 9467 return (0); 9468 } 9469 9470 /* 9471 * Return value of 1, the TCB is unlocked and most 9472 * likely gone, return value of 0, the TCB is still 9473 * locked. 9474 */ 9475 static int 9476 bbr_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, 9477 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9478 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9479 { 9480 int32_t ourfinisacked = 0; 9481 int32_t ret_val; 9482 struct tcp_bbr *bbr; 9483 9484 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9485 ctf_calc_rwin(so, tp); 9486 if ((thflags & TH_RST) || 9487 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9488 return (ctf_process_rst(m, th, so, tp)); 9489 /* 9490 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9491 * synchronized state. 9492 */ 9493 if (thflags & TH_SYN) { 9494 ctf_challenge_ack(m, th, tp, &ret_val); 9495 return (ret_val); 9496 } 9497 /* 9498 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9499 * it's less than ts_recent, drop it. 9500 */ 9501 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9502 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9503 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9504 return (ret_val); 9505 } 9506 INP_WLOCK_ASSERT(tp->t_inpcb); 9507 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9508 return (ret_val); 9509 } 9510 /* 9511 * If new data are received on a connection after the user processes 9512 * are gone, then RST the other end. 9513 */ 9514 if ((so->so_state & SS_NOFDREF) && tlen) { 9515 /* 9516 * We call a new function now so we might continue and setup 9517 * to reset at all data being ack'd. 9518 */ 9519 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9520 return (1); 9521 } 9522 /* 9523 * If last ACK falls within this segment's sequence numbers, record 9524 * its timestamp. NOTE: 1) That the test incorporates suggestions 9525 * from the latest proposal of the tcplw@cray.com list (Braden 9526 * 1993/04/26). 2) That updating only on newer timestamps interferes 9527 * with our earlier PAWS tests, so this check should be solely 9528 * predicated on the sequence space of this segment. 3) That we 9529 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9530 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9531 * SEG.Len, This modified check allows us to overcome RFC1323's 9532 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9533 * p.869. In such cases, we can still calculate the RTT correctly 9534 * when RCV.NXT == Last.ACK.Sent. 9535 */ 9536 if ((to->to_flags & TOF_TS) != 0 && 9537 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9538 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9539 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9540 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9541 tp->ts_recent = to->to_tsval; 9542 } 9543 /* 9544 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9545 * is on (half-synchronized state), then queue data for later 9546 * processing; else drop segment and return. 9547 */ 9548 if ((thflags & TH_ACK) == 0) { 9549 if (tp->t_flags & TF_NEEDSYN) { 9550 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9551 tiwin, thflags, nxt_pkt)); 9552 } else if (tp->t_flags & TF_ACKNOW) { 9553 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9554 bbr->r_wanted_output = 1; 9555 return (ret_val); 9556 } else { 9557 ctf_do_drop(m, NULL); 9558 return (0); 9559 } 9560 } 9561 /* 9562 * Ack processing. 9563 */ 9564 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9565 return (ret_val); 9566 } 9567 if (ourfinisacked) { 9568 /* 9569 * If we can't receive any more data, then closing user can 9570 * proceed. Starting the timer is contrary to the 9571 * specification, but if we don't get a FIN we'll hang 9572 * forever. 9573 * 9574 * XXXjl: we should release the tp also, and use a 9575 * compressed state. 9576 */ 9577 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { 9578 soisdisconnected(so); 9579 tcp_timer_activate(tp, TT_2MSL, 9580 (tcp_fast_finwait2_recycle ? 9581 tcp_finwait2_timeout : 9582 TP_MAXIDLE(tp))); 9583 } 9584 tcp_state_change(tp, TCPS_FIN_WAIT_2); 9585 } 9586 if (sbavail(&so->so_snd)) { 9587 if (ctf_progress_timeout_check(tp, true)) { 9588 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9589 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9590 return (1); 9591 } 9592 } 9593 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9594 tiwin, thflags, nxt_pkt)); 9595 } 9596 9597 /* 9598 * Return value of 1, the TCB is unlocked and most 9599 * likely gone, return value of 0, the TCB is still 9600 * locked. 9601 */ 9602 static int 9603 bbr_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, 9604 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9605 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9606 { 9607 int32_t ourfinisacked = 0; 9608 int32_t ret_val; 9609 struct tcp_bbr *bbr; 9610 9611 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9612 ctf_calc_rwin(so, tp); 9613 if ((thflags & TH_RST) || 9614 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9615 return (ctf_process_rst(m, th, so, tp)); 9616 /* 9617 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9618 * synchronized state. 9619 */ 9620 if (thflags & TH_SYN) { 9621 ctf_challenge_ack(m, th, tp, &ret_val); 9622 return (ret_val); 9623 } 9624 /* 9625 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9626 * it's less than ts_recent, drop it. 9627 */ 9628 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9629 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9630 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9631 return (ret_val); 9632 } 9633 INP_WLOCK_ASSERT(tp->t_inpcb); 9634 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9635 return (ret_val); 9636 } 9637 /* 9638 * If new data are received on a connection after the user processes 9639 * are gone, then RST the other end. 9640 */ 9641 if ((so->so_state & SS_NOFDREF) && tlen) { 9642 /* 9643 * We call a new function now so we might continue and setup 9644 * to reset at all data being ack'd. 9645 */ 9646 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9647 return (1); 9648 } 9649 /* 9650 * If last ACK falls within this segment's sequence numbers, record 9651 * its timestamp. NOTE: 1) That the test incorporates suggestions 9652 * from the latest proposal of the tcplw@cray.com list (Braden 9653 * 1993/04/26). 2) That updating only on newer timestamps interferes 9654 * with our earlier PAWS tests, so this check should be solely 9655 * predicated on the sequence space of this segment. 3) That we 9656 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9657 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9658 * SEG.Len, This modified check allows us to overcome RFC1323's 9659 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9660 * p.869. In such cases, we can still calculate the RTT correctly 9661 * when RCV.NXT == Last.ACK.Sent. 9662 */ 9663 if ((to->to_flags & TOF_TS) != 0 && 9664 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9665 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9666 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9667 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9668 tp->ts_recent = to->to_tsval; 9669 } 9670 /* 9671 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9672 * is on (half-synchronized state), then queue data for later 9673 * processing; else drop segment and return. 9674 */ 9675 if ((thflags & TH_ACK) == 0) { 9676 if (tp->t_flags & TF_NEEDSYN) { 9677 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9678 tiwin, thflags, nxt_pkt)); 9679 } else if (tp->t_flags & TF_ACKNOW) { 9680 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9681 bbr->r_wanted_output = 1; 9682 return (ret_val); 9683 } else { 9684 ctf_do_drop(m, NULL); 9685 return (0); 9686 } 9687 } 9688 /* 9689 * Ack processing. 9690 */ 9691 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9692 return (ret_val); 9693 } 9694 if (ourfinisacked) { 9695 tcp_twstart(tp); 9696 m_freem(m); 9697 return (1); 9698 } 9699 if (sbavail(&so->so_snd)) { 9700 if (ctf_progress_timeout_check(tp, true)) { 9701 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9702 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9703 return (1); 9704 } 9705 } 9706 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9707 tiwin, thflags, nxt_pkt)); 9708 } 9709 9710 /* 9711 * Return value of 1, the TCB is unlocked and most 9712 * likely gone, return value of 0, the TCB is still 9713 * locked. 9714 */ 9715 static int 9716 bbr_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, 9717 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9718 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9719 { 9720 int32_t ourfinisacked = 0; 9721 int32_t ret_val; 9722 struct tcp_bbr *bbr; 9723 9724 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9725 ctf_calc_rwin(so, tp); 9726 if ((thflags & TH_RST) || 9727 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9728 return (ctf_process_rst(m, th, so, tp)); 9729 /* 9730 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9731 * synchronized state. 9732 */ 9733 if (thflags & TH_SYN) { 9734 ctf_challenge_ack(m, th, tp, &ret_val); 9735 return (ret_val); 9736 } 9737 /* 9738 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9739 * it's less than ts_recent, drop it. 9740 */ 9741 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9742 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9743 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9744 return (ret_val); 9745 } 9746 INP_WLOCK_ASSERT(tp->t_inpcb); 9747 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9748 return (ret_val); 9749 } 9750 /* 9751 * If new data are received on a connection after the user processes 9752 * are gone, then RST the other end. 9753 */ 9754 if ((so->so_state & SS_NOFDREF) && tlen) { 9755 /* 9756 * We call a new function now so we might continue and setup 9757 * to reset at all data being ack'd. 9758 */ 9759 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9760 return (1); 9761 } 9762 /* 9763 * If last ACK falls within this segment's sequence numbers, record 9764 * its timestamp. NOTE: 1) That the test incorporates suggestions 9765 * from the latest proposal of the tcplw@cray.com list (Braden 9766 * 1993/04/26). 2) That updating only on newer timestamps interferes 9767 * with our earlier PAWS tests, so this check should be solely 9768 * predicated on the sequence space of this segment. 3) That we 9769 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9770 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9771 * SEG.Len, This modified check allows us to overcome RFC1323's 9772 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9773 * p.869. In such cases, we can still calculate the RTT correctly 9774 * when RCV.NXT == Last.ACK.Sent. 9775 */ 9776 if ((to->to_flags & TOF_TS) != 0 && 9777 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9778 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9779 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9780 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9781 tp->ts_recent = to->to_tsval; 9782 } 9783 /* 9784 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9785 * is on (half-synchronized state), then queue data for later 9786 * processing; else drop segment and return. 9787 */ 9788 if ((thflags & TH_ACK) == 0) { 9789 if (tp->t_flags & TF_NEEDSYN) { 9790 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9791 tiwin, thflags, nxt_pkt)); 9792 } else if (tp->t_flags & TF_ACKNOW) { 9793 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9794 bbr->r_wanted_output = 1; 9795 return (ret_val); 9796 } else { 9797 ctf_do_drop(m, NULL); 9798 return (0); 9799 } 9800 } 9801 /* 9802 * case TCPS_LAST_ACK: Ack processing. 9803 */ 9804 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9805 return (ret_val); 9806 } 9807 if (ourfinisacked) { 9808 tp = tcp_close(tp); 9809 ctf_do_drop(m, tp); 9810 return (1); 9811 } 9812 if (sbavail(&so->so_snd)) { 9813 if (ctf_progress_timeout_check(tp, true)) { 9814 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9815 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9816 return (1); 9817 } 9818 } 9819 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9820 tiwin, thflags, nxt_pkt)); 9821 } 9822 9823 /* 9824 * Return value of 1, the TCB is unlocked and most 9825 * likely gone, return value of 0, the TCB is still 9826 * locked. 9827 */ 9828 static int 9829 bbr_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, 9830 struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, 9831 uint32_t tiwin, int32_t thflags, int32_t nxt_pkt, uint8_t iptos) 9832 { 9833 int32_t ourfinisacked = 0; 9834 int32_t ret_val; 9835 struct tcp_bbr *bbr; 9836 9837 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9838 ctf_calc_rwin(so, tp); 9839 /* Reset receive buffer auto scaling when not in bulk receive mode. */ 9840 if ((thflags & TH_RST) || 9841 (tp->t_fin_is_rst && (thflags & TH_FIN))) 9842 return (ctf_process_rst(m, th, so, tp)); 9843 9844 /* 9845 * RFC5961 Section 4.2 Send challenge ACK for any SYN in 9846 * synchronized state. 9847 */ 9848 if (thflags & TH_SYN) { 9849 ctf_challenge_ack(m, th, tp, &ret_val); 9850 return (ret_val); 9851 } 9852 INP_WLOCK_ASSERT(tp->t_inpcb); 9853 /* 9854 * RFC 1323 PAWS: If we have a timestamp reply on this segment and 9855 * it's less than ts_recent, drop it. 9856 */ 9857 if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && 9858 TSTMP_LT(to->to_tsval, tp->ts_recent)) { 9859 if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) 9860 return (ret_val); 9861 } 9862 INP_WLOCK_ASSERT(tp->t_inpcb); 9863 if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { 9864 return (ret_val); 9865 } 9866 /* 9867 * If new data are received on a connection after the user processes 9868 * are gone, then we may RST the other end depending on the outcome 9869 * of bbr_check_data_after_close. 9870 */ 9871 if ((so->so_state & SS_NOFDREF) && 9872 tlen) { 9873 /* 9874 * We call a new function now so we might continue and setup 9875 * to reset at all data being ack'd. 9876 */ 9877 if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) 9878 return (1); 9879 } 9880 INP_WLOCK_ASSERT(tp->t_inpcb); 9881 /* 9882 * If last ACK falls within this segment's sequence numbers, record 9883 * its timestamp. NOTE: 1) That the test incorporates suggestions 9884 * from the latest proposal of the tcplw@cray.com list (Braden 9885 * 1993/04/26). 2) That updating only on newer timestamps interferes 9886 * with our earlier PAWS tests, so this check should be solely 9887 * predicated on the sequence space of this segment. 3) That we 9888 * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ 9889 * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + 9890 * SEG.Len, This modified check allows us to overcome RFC1323's 9891 * limitations as described in Stevens TCP/IP Illustrated Vol. 2 9892 * p.869. In such cases, we can still calculate the RTT correctly 9893 * when RCV.NXT == Last.ACK.Sent. 9894 */ 9895 INP_WLOCK_ASSERT(tp->t_inpcb); 9896 if ((to->to_flags & TOF_TS) != 0 && 9897 SEQ_LEQ(th->th_seq, tp->last_ack_sent) && 9898 SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + 9899 ((thflags & (TH_SYN | TH_FIN)) != 0))) { 9900 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 9901 tp->ts_recent = to->to_tsval; 9902 } 9903 /* 9904 * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag 9905 * is on (half-synchronized state), then queue data for later 9906 * processing; else drop segment and return. 9907 */ 9908 if ((thflags & TH_ACK) == 0) { 9909 if (tp->t_flags & TF_NEEDSYN) { 9910 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9911 tiwin, thflags, nxt_pkt)); 9912 } else if (tp->t_flags & TF_ACKNOW) { 9913 ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); 9914 bbr->r_wanted_output = 1; 9915 return (ret_val); 9916 } else { 9917 ctf_do_drop(m, NULL); 9918 return (0); 9919 } 9920 } 9921 /* 9922 * Ack processing. 9923 */ 9924 INP_WLOCK_ASSERT(tp->t_inpcb); 9925 if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { 9926 return (ret_val); 9927 } 9928 if (sbavail(&so->so_snd)) { 9929 if (ctf_progress_timeout_check(tp, true)) { 9930 bbr_log_progress_event(bbr, tp, tick, PROGRESS_DROP, __LINE__); 9931 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 9932 return (1); 9933 } 9934 } 9935 INP_WLOCK_ASSERT(tp->t_inpcb); 9936 return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, 9937 tiwin, thflags, nxt_pkt)); 9938 } 9939 9940 static void 9941 bbr_stop_all_timers(struct tcpcb *tp) 9942 { 9943 struct tcp_bbr *bbr; 9944 9945 /* 9946 * Assure no timers are running. 9947 */ 9948 if (tcp_timer_active(tp, TT_PERSIST)) { 9949 /* We enter in persists, set the flag appropriately */ 9950 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 9951 bbr->rc_in_persist = 1; 9952 } 9953 tcp_timer_suspend(tp, TT_PERSIST); 9954 tcp_timer_suspend(tp, TT_REXMT); 9955 tcp_timer_suspend(tp, TT_KEEP); 9956 tcp_timer_suspend(tp, TT_DELACK); 9957 } 9958 9959 static void 9960 bbr_google_mode_on(struct tcp_bbr *bbr) 9961 { 9962 bbr->rc_use_google = 1; 9963 bbr->rc_no_pacing = 0; 9964 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 9965 bbr->r_use_policer = bbr_policer_detection_enabled; 9966 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 9967 bbr->bbr_use_rack_cheat = 0; 9968 bbr->r_ctl.rc_incr_tmrs = 0; 9969 bbr->r_ctl.rc_inc_tcp_oh = 0; 9970 bbr->r_ctl.rc_inc_ip_oh = 0; 9971 bbr->r_ctl.rc_inc_enet_oh = 0; 9972 reset_time(&bbr->r_ctl.rc_delrate, 9973 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 9974 reset_time_small(&bbr->r_ctl.rc_rttprop, 9975 (11 * USECS_IN_SECOND)); 9976 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 9977 } 9978 9979 static void 9980 bbr_google_mode_off(struct tcp_bbr *bbr) 9981 { 9982 bbr->rc_use_google = 0; 9983 bbr->r_ctl.bbr_google_discount = 0; 9984 bbr->no_pacing_until = bbr_no_pacing_until; 9985 bbr->r_use_policer = 0; 9986 if (bbr->no_pacing_until) 9987 bbr->rc_no_pacing = 1; 9988 else 9989 bbr->rc_no_pacing = 0; 9990 if (bbr_use_rack_resend_cheat) 9991 bbr->bbr_use_rack_cheat = 1; 9992 else 9993 bbr->bbr_use_rack_cheat = 0; 9994 if (bbr_incr_timers) 9995 bbr->r_ctl.rc_incr_tmrs = 1; 9996 else 9997 bbr->r_ctl.rc_incr_tmrs = 0; 9998 if (bbr_include_tcp_oh) 9999 bbr->r_ctl.rc_inc_tcp_oh = 1; 10000 else 10001 bbr->r_ctl.rc_inc_tcp_oh = 0; 10002 if (bbr_include_ip_oh) 10003 bbr->r_ctl.rc_inc_ip_oh = 1; 10004 else 10005 bbr->r_ctl.rc_inc_ip_oh = 0; 10006 if (bbr_include_enet_oh) 10007 bbr->r_ctl.rc_inc_enet_oh = 1; 10008 else 10009 bbr->r_ctl.rc_inc_enet_oh = 0; 10010 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10011 reset_time(&bbr->r_ctl.rc_delrate, 10012 bbr_num_pktepo_for_del_limit); 10013 reset_time_small(&bbr->r_ctl.rc_rttprop, 10014 (bbr_filter_len_sec * USECS_IN_SECOND)); 10015 tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); 10016 } 10017 /* 10018 * Return 0 on success, non-zero on failure 10019 * which indicates the error (usually no memory). 10020 */ 10021 static int 10022 bbr_init(struct tcpcb *tp) 10023 { 10024 struct tcp_bbr *bbr = NULL; 10025 struct inpcb *inp; 10026 uint32_t cts; 10027 10028 tp->t_fb_ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO)); 10029 if (tp->t_fb_ptr == NULL) { 10030 /* 10031 * We need to allocate memory but cant. The INP and INP_INFO 10032 * locks and they are recusive (happens during setup. So a 10033 * scheme to drop the locks fails :( 10034 * 10035 */ 10036 return (ENOMEM); 10037 } 10038 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10039 bbr->rtt_valid = 0; 10040 inp = tp->t_inpcb; 10041 inp->inp_flags2 |= INP_CANNOT_DO_ECN; 10042 inp->inp_flags2 |= INP_SUPPORTS_MBUFQ; 10043 TAILQ_INIT(&bbr->r_ctl.rc_map); 10044 TAILQ_INIT(&bbr->r_ctl.rc_free); 10045 TAILQ_INIT(&bbr->r_ctl.rc_tmap); 10046 bbr->rc_tp = tp; 10047 if (tp->t_inpcb) { 10048 bbr->rc_inp = tp->t_inpcb; 10049 } 10050 cts = tcp_get_usecs(&bbr->rc_tv); 10051 tp->t_acktime = 0; 10052 bbr->rc_allow_data_af_clo = bbr_ignore_data_after_close; 10053 bbr->r_ctl.rc_reorder_fade = bbr_reorder_fade; 10054 bbr->rc_tlp_threshold = bbr_tlp_thresh; 10055 bbr->r_ctl.rc_reorder_shift = bbr_reorder_thresh; 10056 bbr->r_ctl.rc_pkt_delay = bbr_pkt_delay; 10057 bbr->r_ctl.rc_min_to = bbr_min_to; 10058 bbr->rc_bbr_state = BBR_STATE_STARTUP; 10059 bbr->r_ctl.bbr_lost_at_state = 0; 10060 bbr->r_ctl.rc_lost_at_startup = 0; 10061 bbr->rc_all_timers_stopped = 0; 10062 bbr->r_ctl.rc_bbr_lastbtlbw = 0; 10063 bbr->r_ctl.rc_pkt_epoch_del = 0; 10064 bbr->r_ctl.rc_pkt_epoch = 0; 10065 bbr->r_ctl.rc_lowest_rtt = 0xffffffff; 10066 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_high_gain; 10067 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 10068 bbr->r_ctl.rc_went_idle_time = cts; 10069 bbr->rc_pacer_started = cts; 10070 bbr->r_ctl.rc_pkt_epoch_time = cts; 10071 bbr->r_ctl.rc_rcvtime = cts; 10072 bbr->r_ctl.rc_bbr_state_time = cts; 10073 bbr->r_ctl.rc_del_time = cts; 10074 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 10075 bbr->r_ctl.last_in_probertt = cts; 10076 bbr->skip_gain = 0; 10077 bbr->gain_is_limited = 0; 10078 bbr->no_pacing_until = bbr_no_pacing_until; 10079 if (bbr->no_pacing_until) 10080 bbr->rc_no_pacing = 1; 10081 if (bbr_use_google_algo) { 10082 bbr->rc_no_pacing = 0; 10083 bbr->rc_use_google = 1; 10084 bbr->r_ctl.bbr_google_discount = bbr_google_discount; 10085 bbr->r_use_policer = bbr_policer_detection_enabled; 10086 } else { 10087 bbr->rc_use_google = 0; 10088 bbr->r_ctl.bbr_google_discount = 0; 10089 bbr->r_use_policer = 0; 10090 } 10091 if (bbr_ts_limiting) 10092 bbr->rc_use_ts_limit = 1; 10093 else 10094 bbr->rc_use_ts_limit = 0; 10095 if (bbr_ts_can_raise) 10096 bbr->ts_can_raise = 1; 10097 else 10098 bbr->ts_can_raise = 0; 10099 if (V_tcp_delack_enabled == 1) 10100 tp->t_delayed_ack = 2; 10101 else if (V_tcp_delack_enabled == 0) 10102 tp->t_delayed_ack = 0; 10103 else if (V_tcp_delack_enabled < 100) 10104 tp->t_delayed_ack = V_tcp_delack_enabled; 10105 else 10106 tp->t_delayed_ack = 2; 10107 if (bbr->rc_use_google == 0) 10108 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10109 else 10110 bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); 10111 bbr->r_ctl.rc_min_rto_ms = bbr_rto_min_ms; 10112 bbr->rc_max_rto_sec = bbr_rto_max_sec; 10113 bbr->rc_init_win = bbr_def_init_win; 10114 if (tp->t_flags & TF_REQ_TSTMP) 10115 bbr->rc_last_options = TCP_TS_OVERHEAD; 10116 bbr->r_ctl.rc_pace_max_segs = tp->t_maxseg - bbr->rc_last_options; 10117 bbr->r_ctl.rc_high_rwnd = tp->snd_wnd; 10118 bbr->r_init_rtt = 1; 10119 10120 counter_u64_add(bbr_flows_nohdwr_pacing, 1); 10121 if (bbr_allow_hdwr_pacing) 10122 bbr->bbr_hdw_pace_ena = 1; 10123 else 10124 bbr->bbr_hdw_pace_ena = 0; 10125 if (bbr_sends_full_iwnd) 10126 bbr->bbr_init_win_cheat = 1; 10127 else 10128 bbr->bbr_init_win_cheat = 0; 10129 bbr->r_ctl.bbr_utter_max = bbr_hptsi_utter_max; 10130 bbr->r_ctl.rc_drain_pg = bbr_drain_gain; 10131 bbr->r_ctl.rc_startup_pg = bbr_high_gain; 10132 bbr->rc_loss_exit = bbr_exit_startup_at_loss; 10133 bbr->r_ctl.bbr_rttprobe_gain_val = bbr_rttprobe_gain; 10134 bbr->r_ctl.bbr_hptsi_per_second = bbr_hptsi_per_second; 10135 bbr->r_ctl.bbr_hptsi_segments_delay_tar = bbr_hptsi_segments_delay_tar; 10136 bbr->r_ctl.bbr_hptsi_segments_max = bbr_hptsi_segments_max; 10137 bbr->r_ctl.bbr_hptsi_segments_floor = bbr_hptsi_segments_floor; 10138 bbr->r_ctl.bbr_hptsi_bytes_min = bbr_hptsi_bytes_min; 10139 bbr->r_ctl.bbr_cross_over = bbr_cross_over; 10140 bbr->r_ctl.rc_rtt_shrinks = cts; 10141 if (bbr->rc_use_google) { 10142 setup_time_filter(&bbr->r_ctl.rc_delrate, 10143 FILTER_TYPE_MAX, 10144 BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); 10145 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10146 FILTER_TYPE_MIN, (11 * USECS_IN_SECOND)); 10147 } else { 10148 setup_time_filter(&bbr->r_ctl.rc_delrate, 10149 FILTER_TYPE_MAX, 10150 bbr_num_pktepo_for_del_limit); 10151 setup_time_filter_small(&bbr->r_ctl.rc_rttprop, 10152 FILTER_TYPE_MIN, (bbr_filter_len_sec * USECS_IN_SECOND)); 10153 } 10154 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_INIT, 0); 10155 if (bbr_uses_idle_restart) 10156 bbr->rc_use_idle_restart = 1; 10157 else 10158 bbr->rc_use_idle_restart = 0; 10159 bbr->r_ctl.rc_bbr_cur_del_rate = 0; 10160 bbr->r_ctl.rc_initial_hptsi_bw = bbr_initial_bw_bps; 10161 if (bbr_resends_use_tso) 10162 bbr->rc_resends_use_tso = 1; 10163 #ifdef NETFLIX_PEAKRATE 10164 tp->t_peakrate_thr = tp->t_maxpeakrate; 10165 #endif 10166 if (tp->snd_una != tp->snd_max) { 10167 /* Create a send map for the current outstanding data */ 10168 struct bbr_sendmap *rsm; 10169 10170 rsm = bbr_alloc(bbr); 10171 if (rsm == NULL) { 10172 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10173 tp->t_fb_ptr = NULL; 10174 return (ENOMEM); 10175 } 10176 rsm->r_rtt_not_allowed = 1; 10177 rsm->r_tim_lastsent[0] = cts; 10178 rsm->r_rtr_cnt = 1; 10179 rsm->r_rtr_bytes = 0; 10180 rsm->r_start = tp->snd_una; 10181 rsm->r_end = tp->snd_max; 10182 rsm->r_dupack = 0; 10183 rsm->r_delivered = bbr->r_ctl.rc_delivered; 10184 rsm->r_ts_valid = 0; 10185 rsm->r_del_ack_ts = tp->ts_recent; 10186 rsm->r_del_time = cts; 10187 if (bbr->r_ctl.r_app_limited_until) 10188 rsm->r_app_limited = 1; 10189 else 10190 rsm->r_app_limited = 0; 10191 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); 10192 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); 10193 rsm->r_in_tmap = 1; 10194 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) 10195 rsm->r_bbr_state = bbr_state_val(bbr); 10196 else 10197 rsm->r_bbr_state = 8; 10198 } 10199 if (bbr_use_rack_resend_cheat && (bbr->rc_use_google == 0)) 10200 bbr->bbr_use_rack_cheat = 1; 10201 if (bbr_incr_timers && (bbr->rc_use_google == 0)) 10202 bbr->r_ctl.rc_incr_tmrs = 1; 10203 if (bbr_include_tcp_oh && (bbr->rc_use_google == 0)) 10204 bbr->r_ctl.rc_inc_tcp_oh = 1; 10205 if (bbr_include_ip_oh && (bbr->rc_use_google == 0)) 10206 bbr->r_ctl.rc_inc_ip_oh = 1; 10207 if (bbr_include_enet_oh && (bbr->rc_use_google == 0)) 10208 bbr->r_ctl.rc_inc_enet_oh = 1; 10209 10210 bbr_log_type_statechange(bbr, cts, __LINE__); 10211 if (TCPS_HAVEESTABLISHED(tp->t_state) && 10212 (tp->t_srtt)) { 10213 uint32_t rtt; 10214 10215 rtt = (TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); 10216 apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); 10217 } 10218 /* announce the settings and state */ 10219 bbr_log_settings_change(bbr, BBR_RECOVERY_LOWRTT); 10220 tcp_bbr_tso_size_check(bbr, cts); 10221 /* 10222 * Now call the generic function to start a timer. This will place 10223 * the TCB on the hptsi wheel if a timer is needed with appropriate 10224 * flags. 10225 */ 10226 bbr_stop_all_timers(tp); 10227 bbr_start_hpts_timer(bbr, tp, cts, 5, 0, 0); 10228 return (0); 10229 } 10230 10231 /* 10232 * Return 0 if we can accept the connection. Return 10233 * non-zero if we can't handle the connection. A EAGAIN 10234 * means you need to wait until the connection is up. 10235 * a EADDRNOTAVAIL means we can never handle the connection 10236 * (no SACK). 10237 */ 10238 static int 10239 bbr_handoff_ok(struct tcpcb *tp) 10240 { 10241 if ((tp->t_state == TCPS_CLOSED) || 10242 (tp->t_state == TCPS_LISTEN)) { 10243 /* Sure no problem though it may not stick */ 10244 return (0); 10245 } 10246 if ((tp->t_state == TCPS_SYN_SENT) || 10247 (tp->t_state == TCPS_SYN_RECEIVED)) { 10248 /* 10249 * We really don't know you have to get to ESTAB or beyond 10250 * to tell. 10251 */ 10252 return (EAGAIN); 10253 } 10254 if (tp->t_flags & TF_SENTFIN) 10255 return (EINVAL); 10256 if ((tp->t_flags & TF_SACK_PERMIT) || bbr_sack_not_required) { 10257 return (0); 10258 } 10259 /* 10260 * If we reach here we don't do SACK on this connection so we can 10261 * never do rack. 10262 */ 10263 return (EINVAL); 10264 } 10265 10266 static void 10267 bbr_fini(struct tcpcb *tp, int32_t tcb_is_purged) 10268 { 10269 if (tp->t_fb_ptr) { 10270 uint32_t calc; 10271 struct tcp_bbr *bbr; 10272 struct bbr_sendmap *rsm; 10273 10274 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 10275 if (bbr->r_ctl.crte) 10276 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 10277 bbr_log_flowend(bbr); 10278 bbr->rc_tp = NULL; 10279 if (tp->t_inpcb) { 10280 /* Backout any flags2 we applied */ 10281 tp->t_inpcb->inp_flags2 &= ~INP_CANNOT_DO_ECN; 10282 tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ; 10283 tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 10284 } 10285 if (bbr->bbr_hdrw_pacing) 10286 counter_u64_add(bbr_flows_whdwr_pacing, -1); 10287 else 10288 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 10289 if (bbr->r_ctl.crte != NULL) { 10290 tcp_rel_pacing_rate(bbr->r_ctl.crte, tp); 10291 bbr->r_ctl.crte = NULL; 10292 } 10293 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10294 while (rsm) { 10295 TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); 10296 uma_zfree(bbr_zone, rsm); 10297 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 10298 } 10299 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10300 while (rsm) { 10301 TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); 10302 uma_zfree(bbr_zone, rsm); 10303 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); 10304 } 10305 calc = bbr->r_ctl.rc_high_rwnd - bbr->r_ctl.rc_init_rwnd; 10306 if (calc > (bbr->r_ctl.rc_init_rwnd / 10)) 10307 BBR_STAT_INC(bbr_dynamic_rwnd); 10308 else 10309 BBR_STAT_INC(bbr_static_rwnd); 10310 bbr->r_ctl.rc_free_cnt = 0; 10311 uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); 10312 tp->t_fb_ptr = NULL; 10313 } 10314 /* Make sure snd_nxt is correctly set */ 10315 tp->snd_nxt = tp->snd_max; 10316 } 10317 10318 static void 10319 bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win) 10320 { 10321 switch (tp->t_state) { 10322 case TCPS_SYN_SENT: 10323 bbr->r_state = TCPS_SYN_SENT; 10324 bbr->r_substate = bbr_do_syn_sent; 10325 break; 10326 case TCPS_SYN_RECEIVED: 10327 bbr->r_state = TCPS_SYN_RECEIVED; 10328 bbr->r_substate = bbr_do_syn_recv; 10329 break; 10330 case TCPS_ESTABLISHED: 10331 bbr->r_ctl.rc_init_rwnd = max(win, bbr->rc_tp->snd_wnd); 10332 bbr->r_state = TCPS_ESTABLISHED; 10333 bbr->r_substate = bbr_do_established; 10334 break; 10335 case TCPS_CLOSE_WAIT: 10336 bbr->r_state = TCPS_CLOSE_WAIT; 10337 bbr->r_substate = bbr_do_close_wait; 10338 break; 10339 case TCPS_FIN_WAIT_1: 10340 bbr->r_state = TCPS_FIN_WAIT_1; 10341 bbr->r_substate = bbr_do_fin_wait_1; 10342 break; 10343 case TCPS_CLOSING: 10344 bbr->r_state = TCPS_CLOSING; 10345 bbr->r_substate = bbr_do_closing; 10346 break; 10347 case TCPS_LAST_ACK: 10348 bbr->r_state = TCPS_LAST_ACK; 10349 bbr->r_substate = bbr_do_lastack; 10350 break; 10351 case TCPS_FIN_WAIT_2: 10352 bbr->r_state = TCPS_FIN_WAIT_2; 10353 bbr->r_substate = bbr_do_fin_wait_2; 10354 break; 10355 case TCPS_LISTEN: 10356 case TCPS_CLOSED: 10357 case TCPS_TIME_WAIT: 10358 default: 10359 break; 10360 }; 10361 } 10362 10363 static void 10364 bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int32_t line, int dolog) 10365 { 10366 /* 10367 * Now what state are we going into now? Is there adjustments 10368 * needed? 10369 */ 10370 int32_t old_state, old_gain; 10371 10372 old_state = bbr_state_val(bbr); 10373 old_gain = bbr->r_ctl.rc_bbr_hptsi_gain; 10374 if (bbr_state_val(bbr) == BBR_SUB_LEVEL1) { 10375 /* Save the lowest srtt we saw in our end of the sub-state */ 10376 bbr->rc_hit_state_1 = 0; 10377 if (bbr->r_ctl.bbr_smallest_srtt_this_state != 0xffffffff) 10378 bbr->r_ctl.bbr_smallest_srtt_state2 = bbr->r_ctl.bbr_smallest_srtt_this_state; 10379 } 10380 bbr->rc_bbr_substate++; 10381 if (bbr->rc_bbr_substate >= BBR_SUBSTATE_COUNT) { 10382 /* Cycle back to first state-> gain */ 10383 bbr->rc_bbr_substate = 0; 10384 } 10385 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10386 /* 10387 * We enter the gain(5/4) cycle (possibly less if 10388 * shallow buffer detection is enabled) 10389 */ 10390 if (bbr->skip_gain) { 10391 /* 10392 * Hardware pacing has set our rate to 10393 * the max and limited our b/w just 10394 * do level i.e. no gain. 10395 */ 10396 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_LEVEL1]; 10397 } else if (bbr->gain_is_limited && 10398 bbr->bbr_hdrw_pacing && 10399 bbr->r_ctl.crte) { 10400 /* 10401 * We can't gain above the hardware pacing 10402 * rate which is less than our rate + the gain 10403 * calculate the gain needed to reach the hardware 10404 * pacing rate.. 10405 */ 10406 uint64_t bw, rate, gain_calc; 10407 10408 bw = bbr_get_bw(bbr); 10409 rate = bbr->r_ctl.crte->rate; 10410 if ((rate > bw) && 10411 (((bw * (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]) / (uint64_t)BBR_UNIT) > rate)) { 10412 gain_calc = (rate * BBR_UNIT) / bw; 10413 if (gain_calc < BBR_UNIT) 10414 gain_calc = BBR_UNIT; 10415 bbr->r_ctl.rc_bbr_hptsi_gain = (uint16_t)gain_calc; 10416 } else { 10417 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10418 } 10419 } else 10420 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; 10421 if ((bbr->rc_use_google == 0) && (bbr_gain_to_target == 0)) { 10422 bbr->r_ctl.rc_bbr_state_atflight = cts; 10423 } else 10424 bbr->r_ctl.rc_bbr_state_atflight = 0; 10425 } else if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10426 bbr->rc_hit_state_1 = 1; 10427 bbr->r_ctl.rc_exta_time_gd = 0; 10428 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10429 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10430 if (bbr_state_drain_2_tar) { 10431 bbr->r_ctl.rc_bbr_state_atflight = 0; 10432 } else 10433 bbr->r_ctl.rc_bbr_state_atflight = cts; 10434 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_DRAIN]; 10435 } else { 10436 /* All other cycles hit here 2-7 */ 10437 if ((old_state == BBR_SUB_DRAIN) && bbr->rc_hit_state_1) { 10438 if (bbr_sub_drain_slam_cwnd && 10439 (bbr->rc_use_google == 0) && 10440 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10441 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10442 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10443 } 10444 if ((cts - bbr->r_ctl.rc_bbr_state_time) > bbr_get_rtt(bbr, BBR_RTT_PROP)) 10445 bbr->r_ctl.rc_exta_time_gd += ((cts - bbr->r_ctl.rc_bbr_state_time) - 10446 bbr_get_rtt(bbr, BBR_RTT_PROP)); 10447 else 10448 bbr->r_ctl.rc_exta_time_gd = 0; 10449 if (bbr->r_ctl.rc_exta_time_gd) { 10450 bbr->r_ctl.rc_level_state_extra = bbr->r_ctl.rc_exta_time_gd; 10451 /* Now chop up the time for each state (div by 7) */ 10452 bbr->r_ctl.rc_level_state_extra /= 7; 10453 if (bbr_rand_ot && bbr->r_ctl.rc_level_state_extra) { 10454 /* Add a randomization */ 10455 bbr_randomize_extra_state_time(bbr); 10456 } 10457 } 10458 } 10459 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10460 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[bbr_state_val(bbr)]; 10461 } 10462 if (bbr->rc_use_google) { 10463 bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); 10464 } 10465 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10466 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 10467 if (dolog) 10468 bbr_log_type_statechange(bbr, cts, line); 10469 10470 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10471 uint32_t time_in; 10472 10473 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10474 if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 10475 counter_u64_add(bbr_state_time[(old_state + 5)], time_in); 10476 } else { 10477 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10478 } 10479 } 10480 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 10481 bbr_set_state_target(bbr, __LINE__); 10482 if (bbr_sub_drain_slam_cwnd && 10483 (bbr->rc_use_google == 0) && 10484 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10485 /* Slam down the cwnd */ 10486 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10487 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10488 if (bbr_sub_drain_app_limit) { 10489 /* Go app limited if we are on a long drain */ 10490 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + 10491 ctf_flight_size(bbr->rc_tp, 10492 (bbr->r_ctl.rc_sacked + 10493 bbr->r_ctl.rc_lost_bytes))); 10494 } 10495 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10496 } 10497 if (bbr->rc_lt_use_bw) { 10498 /* In policed mode we clamp pacing_gain to BBR_UNIT */ 10499 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10500 } 10501 /* Google changes TSO size every cycle */ 10502 if (bbr->rc_use_google) 10503 tcp_bbr_tso_size_check(bbr, cts); 10504 bbr->r_ctl.gain_epoch = cts; 10505 bbr->r_ctl.rc_bbr_state_time = cts; 10506 bbr->r_ctl.substate_pe = bbr->r_ctl.rc_pkt_epoch; 10507 } 10508 10509 static void 10510 bbr_set_probebw_google_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10511 { 10512 if ((bbr_state_val(bbr) == BBR_SUB_DRAIN) && 10513 (google_allow_early_out == 1) && 10514 (bbr->r_ctl.rc_flight_at_input <= bbr->r_ctl.rc_target_at_state)) { 10515 /* We have reached out target flight size possibly early */ 10516 goto change_state; 10517 } 10518 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10519 return; 10520 } 10521 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_get_rtt(bbr, BBR_RTT_PROP)) { 10522 /* 10523 * Must be a rttProp movement forward before 10524 * we can change states. 10525 */ 10526 return; 10527 } 10528 if (bbr_state_val(bbr) == BBR_SUB_GAIN) { 10529 /* 10530 * The needed time has passed but for 10531 * the gain cycle extra rules apply: 10532 * 1) If we have seen loss, we exit 10533 * 2) If we have not reached the target 10534 * we stay in GAIN (gain-to-target). 10535 */ 10536 if (google_consider_lost && losses) 10537 goto change_state; 10538 if (bbr->r_ctl.rc_target_at_state > bbr->r_ctl.rc_flight_at_input) { 10539 return; 10540 } 10541 } 10542 change_state: 10543 /* For gain we must reach our target, all others last 1 rttProp */ 10544 bbr_substate_change(bbr, cts, __LINE__, 1); 10545 } 10546 10547 static void 10548 bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) 10549 { 10550 uint32_t flight, bbr_cur_cycle_time; 10551 10552 if (bbr->rc_use_google) { 10553 bbr_set_probebw_google_gains(bbr, cts, losses); 10554 return; 10555 } 10556 if (cts == 0) { 10557 /* 10558 * Never alow cts to be 0 we 10559 * do this so we can judge if 10560 * we have set a timestamp. 10561 */ 10562 cts = 1; 10563 } 10564 if (bbr_state_is_pkt_epoch) 10565 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); 10566 else 10567 bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PROP); 10568 10569 if (bbr->r_ctl.rc_bbr_state_atflight == 0) { 10570 if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { 10571 flight = ctf_flight_size(bbr->rc_tp, 10572 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10573 if (bbr_sub_drain_slam_cwnd && bbr->rc_hit_state_1) { 10574 /* Keep it slam down */ 10575 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state) { 10576 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10577 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10578 } 10579 if (bbr_sub_drain_app_limit) { 10580 /* Go app limited if we are on a long drain */ 10581 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + flight); 10582 } 10583 } 10584 if (TSTMP_GT(cts, bbr->r_ctl.gain_epoch) && 10585 (((cts - bbr->r_ctl.gain_epoch) > bbr_get_rtt(bbr, BBR_RTT_PROP)) || 10586 (flight >= bbr->r_ctl.flightsize_at_drain))) { 10587 /* 10588 * Still here after the same time as 10589 * the gain. We need to drain harder 10590 * for the next srtt. Reduce by a set amount 10591 * the gain drop is capped at DRAIN states 10592 * value (88). 10593 */ 10594 bbr->r_ctl.flightsize_at_drain = flight; 10595 if (bbr_drain_drop_mul && 10596 bbr_drain_drop_div && 10597 (bbr_drain_drop_mul < bbr_drain_drop_div)) { 10598 /* Use your specific drop value (def 4/5 = 20%) */ 10599 bbr->r_ctl.rc_bbr_hptsi_gain *= bbr_drain_drop_mul; 10600 bbr->r_ctl.rc_bbr_hptsi_gain /= bbr_drain_drop_div; 10601 } else { 10602 /* You get drop of 20% */ 10603 bbr->r_ctl.rc_bbr_hptsi_gain *= 4; 10604 bbr->r_ctl.rc_bbr_hptsi_gain /= 5; 10605 } 10606 if (bbr->r_ctl.rc_bbr_hptsi_gain <= bbr_drain_floor) { 10607 /* Reduce our gain again to the bottom */ 10608 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 10609 } 10610 bbr_log_exit_gain(bbr, cts, 4); 10611 /* 10612 * Extend out so we wait another 10613 * epoch before dropping again. 10614 */ 10615 bbr->r_ctl.gain_epoch = cts; 10616 } 10617 if (flight <= bbr->r_ctl.rc_target_at_state) { 10618 if (bbr_sub_drain_slam_cwnd && 10619 (bbr->rc_use_google == 0) && 10620 (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 10621 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10622 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10623 } 10624 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10625 bbr_log_exit_gain(bbr, cts, 3); 10626 } 10627 } else { 10628 /* Its a gain */ 10629 if (bbr->r_ctl.rc_lost > bbr->r_ctl.bbr_lost_at_state) { 10630 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10631 goto change_state; 10632 } 10633 if ((ctf_outstanding(bbr->rc_tp) >= bbr->r_ctl.rc_target_at_state) || 10634 ((ctf_outstanding(bbr->rc_tp) + bbr->rc_tp->t_maxseg - 1) >= 10635 bbr->rc_tp->snd_wnd)) { 10636 bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); 10637 bbr_log_exit_gain(bbr, cts, 2); 10638 } 10639 } 10640 /** 10641 * We fall through and return always one of two things has 10642 * occurred. 10643 * 1) We are still not at target 10644 * <or> 10645 * 2) We reached the target and set rc_bbr_state_atflight 10646 * which means we no longer hit this block 10647 * next time we are called. 10648 */ 10649 return; 10650 } 10651 change_state: 10652 if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) 10653 return; 10654 if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_cur_cycle_time) { 10655 /* Less than a full time-period has passed */ 10656 return; 10657 } 10658 if (bbr->r_ctl.rc_level_state_extra && 10659 (bbr_state_val(bbr) > BBR_SUB_DRAIN) && 10660 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10661 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10662 /* Less than a full time-period + extra has passed */ 10663 return; 10664 } 10665 if (bbr_gain_gets_extra_too && 10666 bbr->r_ctl.rc_level_state_extra && 10667 (bbr_state_val(bbr) == BBR_SUB_GAIN) && 10668 ((cts - bbr->r_ctl.rc_bbr_state_time) < 10669 (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { 10670 /* Less than a full time-period + extra has passed */ 10671 return; 10672 } 10673 bbr_substate_change(bbr, cts, __LINE__, 1); 10674 } 10675 10676 static uint32_t 10677 bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain) 10678 { 10679 uint32_t mss, tar; 10680 10681 if (bbr->rc_use_google) { 10682 /* Google just uses the cwnd target */ 10683 tar = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), gain); 10684 } else { 10685 mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), 10686 bbr->r_ctl.rc_pace_max_segs); 10687 /* Get the base cwnd with gain rounded to a mss */ 10688 tar = roundup(bbr_get_raw_target_cwnd(bbr, bbr_get_bw(bbr), 10689 gain), mss); 10690 /* Make sure it is within our min */ 10691 if (tar < get_min_cwnd(bbr)) 10692 return (get_min_cwnd(bbr)); 10693 } 10694 return (tar); 10695 } 10696 10697 static void 10698 bbr_set_state_target(struct tcp_bbr *bbr, int line) 10699 { 10700 uint32_t tar, meth; 10701 10702 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && 10703 ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { 10704 /* Special case using old probe-rtt method */ 10705 tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10706 meth = 1; 10707 } else { 10708 /* Non-probe-rtt case and reduced probe-rtt */ 10709 if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && 10710 (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) { 10711 /* For gain cycle we use the hptsi gain */ 10712 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10713 meth = 2; 10714 } else if ((bbr_target_is_bbunit) || bbr->rc_use_google) { 10715 /* 10716 * If configured, or for google all other states 10717 * get BBR_UNIT. 10718 */ 10719 tar = bbr_get_a_state_target(bbr, BBR_UNIT); 10720 meth = 3; 10721 } else { 10722 /* 10723 * Or we set a target based on the pacing gain 10724 * for non-google mode and default (non-configured). 10725 * Note we don't set a target goal below drain (192). 10726 */ 10727 if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN]) { 10728 tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]); 10729 meth = 4; 10730 } else { 10731 tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); 10732 meth = 5; 10733 } 10734 } 10735 } 10736 bbr_log_set_of_state_target(bbr, tar, line, meth); 10737 bbr->r_ctl.rc_target_at_state = tar; 10738 } 10739 10740 static void 10741 bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line) 10742 { 10743 /* Change to probe_rtt */ 10744 uint32_t time_in; 10745 10746 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10747 bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, 10748 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 10749 bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.flightsize_at_drain 10750 + bbr->r_ctl.rc_delivered); 10751 /* Setup so we force feed the filter */ 10752 if (bbr->rc_use_google || bbr_probertt_sets_rtt) 10753 bbr->rc_prtt_set_ts = 1; 10754 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10755 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10756 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10757 } 10758 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_ENTERPROBE, 0); 10759 bbr->r_ctl.rc_rtt_shrinks = cts; 10760 bbr->r_ctl.last_in_probertt = cts; 10761 bbr->r_ctl.rc_probertt_srttchktim = cts; 10762 bbr->r_ctl.rc_bbr_state_time = cts; 10763 bbr->rc_bbr_state = BBR_STATE_PROBE_RTT; 10764 /* We need to force the filter to update */ 10765 10766 if ((bbr_sub_drain_slam_cwnd) && 10767 bbr->rc_hit_state_1 && 10768 (bbr->rc_use_google == 0) && 10769 (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { 10770 if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_saved_cwnd) 10771 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10772 } else 10773 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 10774 /* Update the lost */ 10775 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 10776 if ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google){ 10777 /* Set to the non-configurable default of 4 (PROBE_RTT_MIN) */ 10778 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 10779 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10780 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 10781 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10782 bbr_log_set_of_state_target(bbr, bbr->rc_tp->snd_cwnd, __LINE__, 6); 10783 bbr->r_ctl.rc_target_at_state = bbr->rc_tp->snd_cwnd; 10784 } else { 10785 /* 10786 * We bring it down slowly by using a hptsi gain that is 10787 * probably 75%. This will slowly float down our outstanding 10788 * without tampering with the cwnd. 10789 */ 10790 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 10791 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 10792 bbr_set_state_target(bbr, __LINE__); 10793 if (bbr_prtt_slam_cwnd && 10794 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 10795 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 10796 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10797 } 10798 } 10799 if (ctf_flight_size(bbr->rc_tp, 10800 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 10801 bbr->r_ctl.rc_target_at_state) { 10802 /* We are at target */ 10803 bbr->r_ctl.rc_bbr_enters_probertt = cts; 10804 } else { 10805 /* We need to come down to reach target before our time begins */ 10806 bbr->r_ctl.rc_bbr_enters_probertt = 0; 10807 } 10808 bbr->r_ctl.rc_pe_of_prtt = bbr->r_ctl.rc_pkt_epoch; 10809 BBR_STAT_INC(bbr_enter_probertt); 10810 bbr_log_exit_gain(bbr, cts, 0); 10811 bbr_log_type_statechange(bbr, cts, line); 10812 } 10813 10814 static void 10815 bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts) 10816 { 10817 /* 10818 * Sanity check on probe-rtt intervals. 10819 * In crazy situations where we are competing 10820 * against new-reno flows with huge buffers 10821 * our rtt-prop interval could come to dominate 10822 * things if we can't get through a full set 10823 * of cycles, we need to adjust it. 10824 */ 10825 if (bbr_can_adjust_probertt && 10826 (bbr->rc_use_google == 0)) { 10827 uint16_t val = 0; 10828 uint32_t cur_rttp, fval, newval, baseval; 10829 10830 /* Are we to small and go into probe-rtt to often? */ 10831 baseval = (bbr_get_rtt(bbr, BBR_RTT_PROP) * (BBR_SUBSTATE_COUNT + 1)); 10832 cur_rttp = roundup(baseval, USECS_IN_SECOND); 10833 fval = bbr_filter_len_sec * USECS_IN_SECOND; 10834 if (bbr_is_ratio == 0) { 10835 if (fval > bbr_rtt_probe_limit) 10836 newval = cur_rttp + (fval - bbr_rtt_probe_limit); 10837 else 10838 newval = cur_rttp; 10839 } else { 10840 int mul; 10841 10842 mul = fval / bbr_rtt_probe_limit; 10843 newval = cur_rttp * mul; 10844 } 10845 if (cur_rttp > bbr->r_ctl.rc_probertt_int) { 10846 bbr->r_ctl.rc_probertt_int = cur_rttp; 10847 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 10848 val = 1; 10849 } else { 10850 /* 10851 * No adjustments were made 10852 * do we need to shrink it? 10853 */ 10854 if (bbr->r_ctl.rc_probertt_int > bbr_rtt_probe_limit) { 10855 if (cur_rttp <= bbr_rtt_probe_limit) { 10856 /* 10857 * Things have calmed down lets 10858 * shrink all the way to default 10859 */ 10860 bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; 10861 reset_time_small(&bbr->r_ctl.rc_rttprop, 10862 (bbr_filter_len_sec * USECS_IN_SECOND)); 10863 cur_rttp = bbr_rtt_probe_limit; 10864 newval = (bbr_filter_len_sec * USECS_IN_SECOND); 10865 val = 2; 10866 } else { 10867 /* 10868 * Well does some adjustment make sense? 10869 */ 10870 if (cur_rttp < bbr->r_ctl.rc_probertt_int) { 10871 /* We can reduce interval time some */ 10872 bbr->r_ctl.rc_probertt_int = cur_rttp; 10873 reset_time_small(&bbr->r_ctl.rc_rttprop, newval); 10874 val = 3; 10875 } 10876 } 10877 } 10878 } 10879 if (val) 10880 bbr_log_rtt_shrinks(bbr, cts, cur_rttp, newval, __LINE__, BBR_RTTS_RESETS_VALUES, val); 10881 } 10882 } 10883 10884 static void 10885 bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) 10886 { 10887 /* Exit probe-rtt */ 10888 10889 if (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd) { 10890 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 10891 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 10892 } 10893 bbr_log_exit_gain(bbr, cts, 1); 10894 bbr->rc_hit_state_1 = 0; 10895 bbr->r_ctl.rc_rtt_shrinks = cts; 10896 bbr->r_ctl.last_in_probertt = cts; 10897 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_RTTPROBE, 0); 10898 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 10899 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, 10900 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 10901 bbr->r_ctl.rc_delivered); 10902 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 10903 uint32_t time_in; 10904 10905 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 10906 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 10907 } 10908 if (bbr->rc_filled_pipe) { 10909 /* Switch to probe_bw */ 10910 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 10911 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 10912 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; 10913 bbr_substate_change(bbr, cts, __LINE__, 0); 10914 bbr_log_type_statechange(bbr, cts, __LINE__); 10915 } else { 10916 /* Back to startup */ 10917 bbr->rc_bbr_state = BBR_STATE_STARTUP; 10918 bbr->r_ctl.rc_bbr_state_time = cts; 10919 /* 10920 * We don't want to give a complete free 3 10921 * measurements until we exit, so we use 10922 * the number of pe's we were in probe-rtt 10923 * to add to the startup_epoch. That way 10924 * we will still retain the old state. 10925 */ 10926 bbr->r_ctl.rc_bbr_last_startup_epoch += (bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_pe_of_prtt); 10927 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 10928 /* Make sure to use the lower pg when shifting back in */ 10929 if (bbr->r_ctl.rc_lost && 10930 bbr_use_lower_gain_in_startup && 10931 (bbr->rc_use_google == 0)) 10932 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 10933 else 10934 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; 10935 bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; 10936 /* Probably not needed but set it anyway */ 10937 bbr_set_state_target(bbr, __LINE__); 10938 bbr_log_type_statechange(bbr, cts, __LINE__); 10939 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10940 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 0); 10941 } 10942 bbr_check_probe_rtt_limits(bbr, cts); 10943 } 10944 10945 static int32_t inline 10946 bbr_should_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts) 10947 { 10948 if ((bbr->rc_past_init_win == 1) && 10949 (bbr->rc_in_persist == 0) && 10950 (bbr_calc_time(cts, bbr->r_ctl.rc_rtt_shrinks) >= bbr->r_ctl.rc_probertt_int)) { 10951 return (1); 10952 } 10953 if (bbr_can_force_probertt && 10954 (bbr->rc_in_persist == 0) && 10955 (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && 10956 ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { 10957 return (1); 10958 } 10959 return (0); 10960 } 10961 10962 static int32_t 10963 bbr_google_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t pkt_epoch) 10964 { 10965 uint64_t btlbw, gain; 10966 if (pkt_epoch == 0) { 10967 /* 10968 * Need to be on a pkt-epoch to continue. 10969 */ 10970 return (0); 10971 } 10972 btlbw = bbr_get_full_bw(bbr); 10973 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 10974 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 10975 if (btlbw >= gain) { 10976 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 10977 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10978 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 10979 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 10980 } 10981 if ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) 10982 return (1); 10983 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 10984 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 10985 return(0); 10986 } 10987 10988 static int32_t inline 10989 bbr_state_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch) 10990 { 10991 /* Have we gained 25% in the last 3 packet based epoch's? */ 10992 uint64_t btlbw, gain; 10993 int do_exit; 10994 int delta, rtt_gain; 10995 10996 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 10997 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 10998 /* 10999 * This qualifies as a RTT_PROBE session since we drop the 11000 * data outstanding to nothing and waited more than 11001 * bbr_rtt_probe_time. 11002 */ 11003 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11004 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11005 } 11006 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11007 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11008 return (0); 11009 } 11010 if (bbr->rc_use_google) 11011 return (bbr_google_startup(bbr, cts, pkt_epoch)); 11012 11013 if ((bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11014 (bbr_use_lower_gain_in_startup)) { 11015 /* Drop to a lower gain 1.5 x since we saw loss */ 11016 bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; 11017 } 11018 if (pkt_epoch == 0) { 11019 /* 11020 * Need to be on a pkt-epoch to continue. 11021 */ 11022 return (0); 11023 } 11024 if (bbr_rtt_gain_thresh) { 11025 /* 11026 * Do we allow a flow to stay 11027 * in startup with no loss and no 11028 * gain in rtt over a set threshold? 11029 */ 11030 if (bbr->r_ctl.rc_pkt_epoch_rtt && 11031 bbr->r_ctl.startup_last_srtt && 11032 (bbr->r_ctl.rc_pkt_epoch_rtt > bbr->r_ctl.startup_last_srtt)) { 11033 delta = bbr->r_ctl.rc_pkt_epoch_rtt - bbr->r_ctl.startup_last_srtt; 11034 rtt_gain = (delta * 100) / bbr->r_ctl.startup_last_srtt; 11035 } else 11036 rtt_gain = 0; 11037 if ((bbr->r_ctl.startup_last_srtt == 0) || 11038 (bbr->r_ctl.rc_pkt_epoch_rtt < bbr->r_ctl.startup_last_srtt)) 11039 /* First time or new lower value */ 11040 bbr->r_ctl.startup_last_srtt = bbr->r_ctl.rc_pkt_epoch_rtt; 11041 11042 if ((bbr->r_ctl.rc_lost == 0) && 11043 (rtt_gain < bbr_rtt_gain_thresh)) { 11044 /* 11045 * No loss, and we are under 11046 * our gain threhold for 11047 * increasing RTT. 11048 */ 11049 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11050 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11051 bbr_log_startup_event(bbr, cts, rtt_gain, 11052 delta, bbr->r_ctl.startup_last_srtt, 10); 11053 return (0); 11054 } 11055 } 11056 if ((bbr->r_ctl.r_measurement_count == bbr->r_ctl.last_startup_measure) && 11057 (bbr->r_ctl.rc_lost_at_startup == bbr->r_ctl.rc_lost) && 11058 (!IN_RECOVERY(bbr->rc_tp->t_flags))) { 11059 /* 11060 * We only assess if we have a new measurment when 11061 * we have no loss and are not in recovery. 11062 * Drag up by one our last_startup epoch so we will hold 11063 * the number of non-gain we have already accumulated. 11064 */ 11065 if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) 11066 bbr->r_ctl.rc_bbr_last_startup_epoch++; 11067 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11068 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 9); 11069 return (0); 11070 } 11071 /* Case where we reduced the lost (bad retransmit) */ 11072 if (bbr->r_ctl.rc_lost_at_startup > bbr->r_ctl.rc_lost) 11073 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11074 bbr->r_ctl.last_startup_measure = bbr->r_ctl.r_measurement_count; 11075 btlbw = bbr_get_full_bw(bbr); 11076 if (bbr->r_ctl.rc_bbr_hptsi_gain == bbr_startup_lower) 11077 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11078 (uint64_t)bbr_low_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11079 else 11080 gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * 11081 (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; 11082 do_exit = 0; 11083 if (btlbw > bbr->r_ctl.rc_bbr_lastbtlbw) 11084 bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; 11085 if (btlbw >= gain) { 11086 bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; 11087 /* Update the lost so we won't exit in next set of tests */ 11088 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11089 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11090 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); 11091 } 11092 if ((bbr->rc_loss_exit && 11093 (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && 11094 (bbr->r_ctl.rc_pkt_epoch_loss_rate > bbr_startup_loss_thresh)) && 11095 ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)) { 11096 /* 11097 * If we had no gain, we had loss and that loss was above 11098 * our threshould, the rwnd is not constrained, and we have 11099 * had at least 3 packet epochs exit. Note that this is 11100 * switched off by sysctl. Google does not do this by the 11101 * way. 11102 */ 11103 if ((ctf_flight_size(bbr->rc_tp, 11104 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + 11105 (2 * max(bbr->r_ctl.rc_pace_max_segs, bbr->rc_tp->t_maxseg))) <= bbr->rc_tp->snd_wnd) { 11106 do_exit = 1; 11107 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11108 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 4); 11109 } else { 11110 /* Just record an updated loss value */ 11111 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11112 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11113 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 5); 11114 } 11115 } else 11116 bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; 11117 if (((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) || 11118 do_exit) { 11119 /* Return 1 to exit the startup state. */ 11120 return (1); 11121 } 11122 /* Stay in startup */ 11123 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11124 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); 11125 return (0); 11126 } 11127 11128 static void 11129 bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch, uint32_t losses) 11130 { 11131 /* 11132 * A tick occurred in the rtt epoch do we need to do anything? 11133 */ 11134 #ifdef BBR_INVARIANTS 11135 if ((bbr->rc_bbr_state != BBR_STATE_STARTUP) && 11136 (bbr->rc_bbr_state != BBR_STATE_DRAIN) && 11137 (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) && 11138 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 11139 (bbr->rc_bbr_state != BBR_STATE_PROBE_BW)) { 11140 /* Debug code? */ 11141 panic("Unknown BBR state %d?\n", bbr->rc_bbr_state); 11142 } 11143 #endif 11144 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 11145 /* Do we exit the startup state? */ 11146 if (bbr_state_startup(bbr, cts, epoch, pkt_epoch)) { 11147 uint32_t time_in; 11148 11149 bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, 11150 bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 6); 11151 bbr->rc_filled_pipe = 1; 11152 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11153 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11154 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11155 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11156 } else 11157 time_in = 0; 11158 if (bbr->rc_no_pacing) 11159 bbr->rc_no_pacing = 0; 11160 bbr->r_ctl.rc_bbr_state_time = cts; 11161 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_drain_pg; 11162 bbr->rc_bbr_state = BBR_STATE_DRAIN; 11163 bbr_set_state_target(bbr, __LINE__); 11164 if ((bbr->rc_use_google == 0) && 11165 bbr_slam_cwnd_in_main_drain) { 11166 /* Here we don't have to worry about probe-rtt */ 11167 bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; 11168 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11169 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11170 } 11171 bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; 11172 bbr_log_type_statechange(bbr, cts, __LINE__); 11173 if (ctf_flight_size(bbr->rc_tp, 11174 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= 11175 bbr->r_ctl.rc_target_at_state) { 11176 /* 11177 * Switch to probe_bw if we are already 11178 * there 11179 */ 11180 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11181 bbr_substate_change(bbr, cts, __LINE__, 0); 11182 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11183 bbr_log_type_statechange(bbr, cts, __LINE__); 11184 } 11185 } 11186 } else if (bbr->rc_bbr_state == BBR_STATE_IDLE_EXIT) { 11187 uint32_t inflight; 11188 struct tcpcb *tp; 11189 11190 tp = bbr->rc_tp; 11191 inflight = ctf_flight_size(tp, 11192 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11193 if (inflight >= bbr->r_ctl.rc_target_at_state) { 11194 /* We have reached a flight of the cwnd target */ 11195 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11196 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11197 bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; 11198 bbr_set_state_target(bbr, __LINE__); 11199 /* 11200 * Rig it so we don't do anything crazy and 11201 * start fresh with a new randomization. 11202 */ 11203 bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; 11204 bbr->rc_bbr_substate = BBR_SUB_LEVEL6; 11205 bbr_substate_change(bbr, cts, __LINE__, 1); 11206 } 11207 } else if (bbr->rc_bbr_state == BBR_STATE_DRAIN) { 11208 /* Has in-flight reached the bdp (or less)? */ 11209 uint32_t inflight; 11210 struct tcpcb *tp; 11211 11212 tp = bbr->rc_tp; 11213 inflight = ctf_flight_size(tp, 11214 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11215 if ((bbr->rc_use_google == 0) && 11216 bbr_slam_cwnd_in_main_drain && 11217 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11218 /* 11219 * Here we don't have to worry about probe-rtt 11220 * re-slam it, but keep it slammed down. 11221 */ 11222 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11223 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11224 } 11225 if (inflight <= bbr->r_ctl.rc_target_at_state) { 11226 /* We have drained */ 11227 bbr->rc_bbr_state = BBR_STATE_PROBE_BW; 11228 bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; 11229 if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { 11230 uint32_t time_in; 11231 11232 time_in = cts - bbr->r_ctl.rc_bbr_state_time; 11233 counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); 11234 } 11235 if ((bbr->rc_use_google == 0) && 11236 bbr_slam_cwnd_in_main_drain && 11237 (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { 11238 /* Restore the cwnd */ 11239 tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; 11240 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11241 } 11242 /* Setup probe-rtt has being done now RRS-HERE */ 11243 bbr->r_ctl.rc_rtt_shrinks = cts; 11244 bbr->r_ctl.last_in_probertt = cts; 11245 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_LEAVE_DRAIN, 0); 11246 /* Randomly pick a sub-state */ 11247 bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); 11248 bbr_substate_change(bbr, cts, __LINE__, 0); 11249 bbr_log_type_statechange(bbr, cts, __LINE__); 11250 } 11251 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) { 11252 uint32_t flight; 11253 11254 flight = ctf_flight_size(bbr->rc_tp, 11255 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11256 bbr->r_ctl.r_app_limited_until = (flight + bbr->r_ctl.rc_delivered); 11257 if (((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google) && 11258 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11259 /* 11260 * We must keep cwnd at the desired MSS. 11261 */ 11262 bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); 11263 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11264 } else if ((bbr_prtt_slam_cwnd) && 11265 (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { 11266 /* Re-slam it */ 11267 bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; 11268 bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); 11269 } 11270 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) { 11271 /* Has outstanding reached our target? */ 11272 if (flight <= bbr->r_ctl.rc_target_at_state) { 11273 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_REACHTAR, 0); 11274 bbr->r_ctl.rc_bbr_enters_probertt = cts; 11275 /* If time is exactly 0, be 1usec off */ 11276 if (bbr->r_ctl.rc_bbr_enters_probertt == 0) 11277 bbr->r_ctl.rc_bbr_enters_probertt = 1; 11278 if (bbr->rc_use_google == 0) { 11279 /* 11280 * Restore any lowering that as occurred to 11281 * reach here 11282 */ 11283 if (bbr->r_ctl.bbr_rttprobe_gain_val) 11284 bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; 11285 else 11286 bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; 11287 } 11288 } 11289 if ((bbr->r_ctl.rc_bbr_enters_probertt == 0) && 11290 (bbr->rc_use_google == 0) && 11291 bbr->r_ctl.bbr_rttprobe_gain_val && 11292 (((cts - bbr->r_ctl.rc_probertt_srttchktim) > bbr_get_rtt(bbr, bbr_drain_rtt)) || 11293 (flight >= bbr->r_ctl.flightsize_at_drain))) { 11294 /* 11295 * We have doddled with our current hptsi 11296 * gain an srtt and have still not made it 11297 * to target, or we have increased our flight. 11298 * Lets reduce the gain by xx% 11299 * flooring the reduce at DRAIN (based on 11300 * mul/div) 11301 */ 11302 int red; 11303 11304 bbr->r_ctl.flightsize_at_drain = flight; 11305 bbr->r_ctl.rc_probertt_srttchktim = cts; 11306 red = max((bbr->r_ctl.bbr_rttprobe_gain_val / 10), 1); 11307 if ((bbr->r_ctl.rc_bbr_hptsi_gain - red) > max(bbr_drain_floor, 1)) { 11308 /* Reduce our gain again */ 11309 bbr->r_ctl.rc_bbr_hptsi_gain -= red; 11310 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG, 0); 11311 } else if (bbr->r_ctl.rc_bbr_hptsi_gain > max(bbr_drain_floor, 1)) { 11312 /* one more chance before we give up */ 11313 bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); 11314 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG_FINAL, 0); 11315 } else { 11316 /* At the very bottom */ 11317 bbr->r_ctl.rc_bbr_hptsi_gain = max((bbr_drain_floor-1), 1); 11318 } 11319 } 11320 } 11321 if (bbr->r_ctl.rc_bbr_enters_probertt && 11322 (TSTMP_GT(cts, bbr->r_ctl.rc_bbr_enters_probertt)) && 11323 ((cts - bbr->r_ctl.rc_bbr_enters_probertt) >= bbr_rtt_probe_time)) { 11324 /* Time to exit probe RTT normally */ 11325 bbr_exit_probe_rtt(bbr->rc_tp, bbr, cts); 11326 } 11327 } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { 11328 if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && 11329 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 11330 /* 11331 * This qualifies as a RTT_PROBE session since we 11332 * drop the data outstanding to nothing and waited 11333 * more than bbr_rtt_probe_time. 11334 */ 11335 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 11336 bbr_set_reduced_rtt(bbr, cts, __LINE__); 11337 } 11338 if (bbr_should_enter_probe_rtt(bbr, cts)) { 11339 bbr_enter_probe_rtt(bbr, cts, __LINE__); 11340 } else { 11341 bbr_set_probebw_gains(bbr, cts, losses); 11342 } 11343 } 11344 } 11345 11346 static void 11347 bbr_check_bbr_for_state(struct tcp_bbr *bbr, uint32_t cts, int32_t line, uint32_t losses) 11348 { 11349 int32_t epoch = 0; 11350 11351 if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { 11352 bbr_set_epoch(bbr, cts, line); 11353 /* At each epoch doe lt bw sampling */ 11354 epoch = 1; 11355 } 11356 bbr_state_change(bbr, cts, epoch, bbr->rc_is_pkt_epoch_now, losses); 11357 } 11358 11359 static int 11360 bbr_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so, 11361 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, 11362 int32_t nxt_pkt, struct timeval *tv) 11363 { 11364 int32_t thflags, retval; 11365 uint32_t cts, lcts; 11366 uint32_t tiwin; 11367 struct tcpopt to; 11368 struct tcp_bbr *bbr; 11369 struct bbr_sendmap *rsm; 11370 struct timeval ltv; 11371 int32_t did_out = 0; 11372 int32_t in_recovery; 11373 uint16_t nsegs; 11374 int32_t prev_state; 11375 uint32_t lost; 11376 11377 nsegs = max(1, m->m_pkthdr.lro_nsegs); 11378 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 11379 /* add in our stats */ 11380 kern_prefetch(bbr, &prev_state); 11381 prev_state = 0; 11382 thflags = th->th_flags; 11383 /* 11384 * If this is either a state-changing packet or current state isn't 11385 * established, we require a write lock on tcbinfo. Otherwise, we 11386 * allow the tcbinfo to be in either alocked or unlocked, as the 11387 * caller may have unnecessarily acquired a write lock due to a 11388 * race. 11389 */ 11390 INP_WLOCK_ASSERT(tp->t_inpcb); 11391 KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN", 11392 __func__)); 11393 KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT", 11394 __func__)); 11395 11396 tp->t_rcvtime = ticks; 11397 /* 11398 * Unscale the window into a 32-bit value. For the SYN_SENT state 11399 * the scale is zero. 11400 */ 11401 tiwin = th->th_win << tp->snd_scale; 11402 #ifdef STATS 11403 stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin); 11404 #endif 11405 11406 if (m->m_flags & M_TSTMP) { 11407 /* Prefer the hardware timestamp if present */ 11408 struct timespec ts; 11409 11410 mbuf_tstmp2timespec(m, &ts); 11411 bbr->rc_tv.tv_sec = ts.tv_sec; 11412 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11413 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11414 } else if (m->m_flags & M_TSTMP_LRO) { 11415 /* Next the arrival timestamp */ 11416 struct timespec ts; 11417 11418 mbuf_tstmp2timespec(m, &ts); 11419 bbr->rc_tv.tv_sec = ts.tv_sec; 11420 bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; 11421 bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); 11422 } else { 11423 /* 11424 * Ok just get the current time. 11425 */ 11426 bbr->r_ctl.rc_rcvtime = lcts = cts = tcp_get_usecs(&bbr->rc_tv); 11427 } 11428 /* 11429 * Parse options on any incoming segment. 11430 */ 11431 tcp_dooptions(&to, (u_char *)(th + 1), 11432 (th->th_off << 2) - sizeof(struct tcphdr), 11433 (thflags & TH_SYN) ? TO_SYN : 0); 11434 11435 /* 11436 * If timestamps were negotiated during SYN/ACK and a 11437 * segment without a timestamp is received, silently drop 11438 * the segment, unless it is a RST segment or missing timestamps are 11439 * tolerated. 11440 * See section 3.2 of RFC 7323. 11441 */ 11442 if ((tp->t_flags & TF_RCVD_TSTMP) && !(to.to_flags & TOF_TS) && 11443 ((thflags & TH_RST) == 0) && (V_tcp_tolerate_missing_ts == 0)) { 11444 retval = 0; 11445 m_freem(m); 11446 goto done_with_input; 11447 } 11448 /* 11449 * If echoed timestamp is later than the current time, fall back to 11450 * non RFC1323 RTT calculation. Normalize timestamp if syncookies 11451 * were used when this connection was established. 11452 */ 11453 if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) { 11454 to.to_tsecr -= tp->ts_offset; 11455 if (TSTMP_GT(to.to_tsecr, tcp_tv_to_mssectick(&bbr->rc_tv))) 11456 to.to_tsecr = 0; 11457 } 11458 /* 11459 * If its the first time in we need to take care of options and 11460 * verify we can do SACK for rack! 11461 */ 11462 if (bbr->r_state == 0) { 11463 /* 11464 * Process options only when we get SYN/ACK back. The SYN 11465 * case for incoming connections is handled in tcp_syncache. 11466 * According to RFC1323 the window field in a SYN (i.e., a 11467 * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX 11468 * this is traditional behavior, may need to be cleaned up. 11469 */ 11470 if (bbr->rc_inp == NULL) { 11471 bbr->rc_inp = tp->t_inpcb; 11472 } 11473 /* 11474 * We need to init rc_inp here since its not init'd when 11475 * bbr_init is called 11476 */ 11477 if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { 11478 if ((to.to_flags & TOF_SCALE) && 11479 (tp->t_flags & TF_REQ_SCALE)) { 11480 tp->t_flags |= TF_RCVD_SCALE; 11481 tp->snd_scale = to.to_wscale; 11482 } else 11483 tp->t_flags &= ~TF_REQ_SCALE; 11484 /* 11485 * Initial send window. It will be updated with the 11486 * next incoming segment to the scaled value. 11487 */ 11488 tp->snd_wnd = th->th_win; 11489 if ((to.to_flags & TOF_TS) && 11490 (tp->t_flags & TF_REQ_TSTMP)) { 11491 tp->t_flags |= TF_RCVD_TSTMP; 11492 tp->ts_recent = to.to_tsval; 11493 tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); 11494 } else 11495 tp->t_flags &= ~TF_REQ_TSTMP; 11496 if (to.to_flags & TOF_MSS) 11497 tcp_mss(tp, to.to_mss); 11498 if ((tp->t_flags & TF_SACK_PERMIT) && 11499 (to.to_flags & TOF_SACKPERM) == 0) 11500 tp->t_flags &= ~TF_SACK_PERMIT; 11501 if (IS_FASTOPEN(tp->t_flags)) { 11502 if (to.to_flags & TOF_FASTOPEN) { 11503 uint16_t mss; 11504 11505 if (to.to_flags & TOF_MSS) 11506 mss = to.to_mss; 11507 else 11508 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) 11509 mss = TCP6_MSS; 11510 else 11511 mss = TCP_MSS; 11512 tcp_fastopen_update_cache(tp, mss, 11513 to.to_tfo_len, to.to_tfo_cookie); 11514 } else 11515 tcp_fastopen_disable_path(tp); 11516 } 11517 } 11518 /* 11519 * At this point we are at the initial call. Here we decide 11520 * if we are doing RACK or not. We do this by seeing if 11521 * TF_SACK_PERMIT is set, if not rack is *not* possible and 11522 * we switch to the default code. 11523 */ 11524 if ((tp->t_flags & TF_SACK_PERMIT) == 0) { 11525 /* Bail */ 11526 tcp_switch_back_to_default(tp); 11527 (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen, 11528 tlen, iptos); 11529 return (1); 11530 } 11531 /* Set the flag */ 11532 bbr->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; 11533 tcp_set_hpts(tp->t_inpcb); 11534 sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack); 11535 } 11536 if (thflags & TH_ACK) { 11537 /* Track ack types */ 11538 if (to.to_flags & TOF_SACK) 11539 BBR_STAT_INC(bbr_acks_with_sacks); 11540 else 11541 BBR_STAT_INC(bbr_plain_acks); 11542 } 11543 /* 11544 * This is the one exception case where we set the rack state 11545 * always. All other times (timers etc) we must have a rack-state 11546 * set (so we assure we have done the checks above for SACK). 11547 */ 11548 if (thflags & TH_FIN) 11549 tcp_log_end_status(tp, TCP_EI_STATUS_CLIENT_FIN); 11550 if (bbr->r_state != tp->t_state) 11551 bbr_set_state(tp, bbr, tiwin); 11552 11553 if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map)) != NULL) 11554 kern_prefetch(rsm, &prev_state); 11555 prev_state = bbr->r_state; 11556 bbr->rc_ack_was_delayed = 0; 11557 lost = bbr->r_ctl.rc_lost; 11558 bbr->rc_is_pkt_epoch_now = 0; 11559 if (m->m_flags & (M_TSTMP|M_TSTMP_LRO)) { 11560 /* Get the real time into lcts and figure the real delay */ 11561 lcts = tcp_get_usecs(<v); 11562 if (TSTMP_GT(lcts, cts)) { 11563 bbr->r_ctl.rc_ack_hdwr_delay = lcts - cts; 11564 bbr->rc_ack_was_delayed = 1; 11565 if (TSTMP_GT(bbr->r_ctl.rc_ack_hdwr_delay, 11566 bbr->r_ctl.highest_hdwr_delay)) 11567 bbr->r_ctl.highest_hdwr_delay = bbr->r_ctl.rc_ack_hdwr_delay; 11568 } else { 11569 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11570 bbr->rc_ack_was_delayed = 0; 11571 } 11572 } else { 11573 bbr->r_ctl.rc_ack_hdwr_delay = 0; 11574 bbr->rc_ack_was_delayed = 0; 11575 } 11576 bbr_log_ack_event(bbr, th, &to, tlen, nsegs, cts, nxt_pkt, m); 11577 if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { 11578 retval = 0; 11579 m_freem(m); 11580 goto done_with_input; 11581 } 11582 /* 11583 * If a segment with the ACK-bit set arrives in the SYN-SENT state 11584 * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. 11585 */ 11586 if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && 11587 (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { 11588 tcp_log_end_status(tp, TCP_EI_STATUS_RST_IN_FRONT); 11589 ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); 11590 return (1); 11591 } 11592 in_recovery = IN_RECOVERY(tp->t_flags); 11593 if (tiwin > bbr->r_ctl.rc_high_rwnd) 11594 bbr->r_ctl.rc_high_rwnd = tiwin; 11595 #ifdef BBR_INVARIANTS 11596 if ((tp->t_inpcb->inp_flags & INP_DROPPED) || 11597 (tp->t_inpcb->inp_flags2 & INP_FREED)) { 11598 panic("tp:%p bbr:%p given a dropped inp:%p", 11599 tp, bbr, tp->t_inpcb); 11600 } 11601 #endif 11602 bbr->r_ctl.rc_flight_at_input = ctf_flight_size(tp, 11603 (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11604 bbr->rtt_valid = 0; 11605 if (to.to_flags & TOF_TS) { 11606 bbr->rc_ts_valid = 1; 11607 bbr->r_ctl.last_inbound_ts = to.to_tsval; 11608 } else { 11609 bbr->rc_ts_valid = 0; 11610 bbr->r_ctl.last_inbound_ts = 0; 11611 } 11612 retval = (*bbr->r_substate) (m, th, so, 11613 tp, &to, drop_hdrlen, 11614 tlen, tiwin, thflags, nxt_pkt, iptos); 11615 #ifdef BBR_INVARIANTS 11616 if ((retval == 0) && 11617 (tp->t_inpcb == NULL)) { 11618 panic("retval:%d tp:%p t_inpcb:NULL state:%d", 11619 retval, tp, prev_state); 11620 } 11621 #endif 11622 if (nxt_pkt == 0) 11623 BBR_STAT_INC(bbr_rlock_left_ret0); 11624 else 11625 BBR_STAT_INC(bbr_rlock_left_ret1); 11626 if (retval == 0) { 11627 /* 11628 * If retval is 1 the tcb is unlocked and most likely the tp 11629 * is gone. 11630 */ 11631 INP_WLOCK_ASSERT(tp->t_inpcb); 11632 tcp_bbr_xmit_timer_commit(bbr, tp, cts); 11633 if (bbr->rc_is_pkt_epoch_now) 11634 bbr_set_pktepoch(bbr, cts, __LINE__); 11635 bbr_check_bbr_for_state(bbr, cts, __LINE__, (bbr->r_ctl.rc_lost - lost)); 11636 if (nxt_pkt == 0) { 11637 if (bbr->r_wanted_output != 0) { 11638 bbr->rc_output_starts_timer = 0; 11639 did_out = 1; 11640 (void)tp->t_fb->tfb_tcp_output(tp); 11641 } else 11642 bbr_start_hpts_timer(bbr, tp, cts, 6, 0, 0); 11643 } 11644 if ((nxt_pkt == 0) && 11645 ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && 11646 (SEQ_GT(tp->snd_max, tp->snd_una) || 11647 (tp->t_flags & TF_DELACK) || 11648 ((V_tcp_always_keepalive || bbr->rc_inp->inp_socket->so_options & SO_KEEPALIVE) && 11649 (tp->t_state <= TCPS_CLOSING)))) { 11650 /* 11651 * We could not send (probably in the hpts but 11652 * stopped the timer)? 11653 */ 11654 if ((tp->snd_max == tp->snd_una) && 11655 ((tp->t_flags & TF_DELACK) == 0) && 11656 (bbr->rc_inp->inp_in_hpts) && 11657 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 11658 /* 11659 * keep alive not needed if we are hptsi 11660 * output yet 11661 */ 11662 ; 11663 } else { 11664 if (bbr->rc_inp->inp_in_hpts) { 11665 tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); 11666 if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 11667 (TSTMP_GT(lcts, bbr->rc_pacer_started))) { 11668 uint32_t del; 11669 11670 del = lcts - bbr->rc_pacer_started; 11671 if (bbr->r_ctl.rc_last_delay_val > del) { 11672 BBR_STAT_INC(bbr_force_timer_start); 11673 bbr->r_ctl.rc_last_delay_val -= del; 11674 bbr->rc_pacer_started = lcts; 11675 } else { 11676 /* We are late */ 11677 bbr->r_ctl.rc_last_delay_val = 0; 11678 BBR_STAT_INC(bbr_force_output); 11679 (void)tp->t_fb->tfb_tcp_output(tp); 11680 } 11681 } 11682 } 11683 bbr_start_hpts_timer(bbr, tp, cts, 8, bbr->r_ctl.rc_last_delay_val, 11684 0); 11685 } 11686 } else if ((bbr->rc_output_starts_timer == 0) && (nxt_pkt == 0)) { 11687 /* Do we have the correct timer running? */ 11688 bbr_timer_audit(tp, bbr, lcts, &so->so_snd); 11689 } 11690 /* Do we have a new state */ 11691 if (bbr->r_state != tp->t_state) 11692 bbr_set_state(tp, bbr, tiwin); 11693 done_with_input: 11694 bbr_log_doseg_done(bbr, cts, nxt_pkt, did_out); 11695 if (did_out) 11696 bbr->r_wanted_output = 0; 11697 #ifdef BBR_INVARIANTS 11698 if (tp->t_inpcb == NULL) { 11699 panic("OP:%d retval:%d tp:%p t_inpcb:NULL state:%d", 11700 did_out, 11701 retval, tp, prev_state); 11702 } 11703 #endif 11704 } 11705 return (retval); 11706 } 11707 11708 static void 11709 bbr_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, 11710 struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos) 11711 { 11712 struct timeval tv; 11713 int retval; 11714 11715 /* First lets see if we have old packets */ 11716 if (tp->t_in_pkt) { 11717 if (ctf_do_queued_segments(so, tp, 1)) { 11718 m_freem(m); 11719 return; 11720 } 11721 } 11722 if (m->m_flags & M_TSTMP_LRO) { 11723 tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; 11724 tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; 11725 } else { 11726 /* Should not be should we kassert instead? */ 11727 tcp_get_usecs(&tv); 11728 } 11729 retval = bbr_do_segment_nounlock(m, th, so, tp, 11730 drop_hdrlen, tlen, iptos, 0, &tv); 11731 if (retval == 0) { 11732 INP_WUNLOCK(tp->t_inpcb); 11733 } 11734 } 11735 11736 /* 11737 * Return how much data can be sent without violating the 11738 * cwnd or rwnd. 11739 */ 11740 11741 static inline uint32_t 11742 bbr_what_can_we_send(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t sendwin, 11743 uint32_t avail, int32_t sb_offset, uint32_t cts) 11744 { 11745 uint32_t len; 11746 11747 if (ctf_outstanding(tp) >= tp->snd_wnd) { 11748 /* We never want to go over our peers rcv-window */ 11749 len = 0; 11750 } else { 11751 uint32_t flight; 11752 11753 flight = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); 11754 if (flight >= sendwin) { 11755 /* 11756 * We have in flight what we are allowed by cwnd (if 11757 * it was rwnd blocking it would have hit above out 11758 * >= tp->snd_wnd). 11759 */ 11760 return (0); 11761 } 11762 len = sendwin - flight; 11763 if ((len + ctf_outstanding(tp)) > tp->snd_wnd) { 11764 /* We would send too much (beyond the rwnd) */ 11765 len = tp->snd_wnd - ctf_outstanding(tp); 11766 } 11767 if ((len + sb_offset) > avail) { 11768 /* 11769 * We don't have that much in the SB, how much is 11770 * there? 11771 */ 11772 len = avail - sb_offset; 11773 } 11774 } 11775 return (len); 11776 } 11777 11778 static inline void 11779 bbr_do_error_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11780 { 11781 #ifdef NETFLIX_STATS 11782 KMOD_TCPSTAT_INC(tcps_sndpack_error); 11783 KMOD_TCPSTAT_ADD(tcps_sndbyte_error, len); 11784 #endif 11785 } 11786 11787 static inline void 11788 bbr_do_send_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) 11789 { 11790 if (error) { 11791 bbr_do_error_accounting(tp, bbr, rsm, len, error); 11792 return; 11793 } 11794 if (rsm) { 11795 if (rsm->r_flags & BBR_TLP) { 11796 /* 11797 * TLP should not count in retran count, but in its 11798 * own bin 11799 */ 11800 #ifdef NETFLIX_STATS 11801 KMOD_TCPSTAT_INC(tcps_tlpresends); 11802 KMOD_TCPSTAT_ADD(tcps_tlpresend_bytes, len); 11803 #endif 11804 } else { 11805 /* Retransmit */ 11806 tp->t_sndrexmitpack++; 11807 KMOD_TCPSTAT_INC(tcps_sndrexmitpack); 11808 KMOD_TCPSTAT_ADD(tcps_sndrexmitbyte, len); 11809 #ifdef STATS 11810 stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB, 11811 len); 11812 #endif 11813 } 11814 /* 11815 * Logs in 0 - 8, 8 is all non probe_bw states 0-7 is 11816 * sub-state 11817 */ 11818 counter_u64_add(bbr_state_lost[rsm->r_bbr_state], len); 11819 if (bbr->rc_bbr_state != BBR_STATE_PROBE_BW) { 11820 /* Non probe_bw log in 1, 2, or 4. */ 11821 counter_u64_add(bbr_state_resend[bbr->rc_bbr_state], len); 11822 } else { 11823 /* 11824 * Log our probe state 3, and log also 5-13 to show 11825 * us the recovery sub-state for the send. This 11826 * means that 3 == (5+6+7+8+9+10+11+12+13) 11827 */ 11828 counter_u64_add(bbr_state_resend[BBR_STATE_PROBE_BW], len); 11829 counter_u64_add(bbr_state_resend[(bbr_state_val(bbr) + 5)], len); 11830 } 11831 /* Place in both 16's the totals of retransmitted */ 11832 counter_u64_add(bbr_state_lost[16], len); 11833 counter_u64_add(bbr_state_resend[16], len); 11834 /* Place in 17's the total sent */ 11835 counter_u64_add(bbr_state_resend[17], len); 11836 counter_u64_add(bbr_state_lost[17], len); 11837 11838 } else { 11839 /* New sends */ 11840 KMOD_TCPSTAT_INC(tcps_sndpack); 11841 KMOD_TCPSTAT_ADD(tcps_sndbyte, len); 11842 /* Place in 17's the total sent */ 11843 counter_u64_add(bbr_state_resend[17], len); 11844 counter_u64_add(bbr_state_lost[17], len); 11845 #ifdef STATS 11846 stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB, 11847 len); 11848 #endif 11849 } 11850 } 11851 11852 static void 11853 bbr_cwnd_limiting(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t in_level) 11854 { 11855 if (bbr->rc_filled_pipe && bbr_target_cwnd_mult_limit && (bbr->rc_use_google == 0)) { 11856 /* 11857 * Limit the cwnd to not be above N x the target plus whats 11858 * is outstanding. The target is based on the current b/w 11859 * estimate. 11860 */ 11861 uint32_t target; 11862 11863 target = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), BBR_UNIT); 11864 target += ctf_outstanding(tp); 11865 target *= bbr_target_cwnd_mult_limit; 11866 if (tp->snd_cwnd > target) 11867 tp->snd_cwnd = target; 11868 bbr_log_type_cwndupd(bbr, 0, 0, 0, 10, 0, 0, __LINE__); 11869 } 11870 } 11871 11872 static int 11873 bbr_window_update_needed(struct tcpcb *tp, struct socket *so, uint32_t recwin, int32_t maxseg) 11874 { 11875 /* 11876 * "adv" is the amount we could increase the window, taking into 11877 * account that we are limited by TCP_MAXWIN << tp->rcv_scale. 11878 */ 11879 int32_t adv; 11880 int32_t oldwin; 11881 11882 adv = recwin; 11883 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) { 11884 oldwin = (tp->rcv_adv - tp->rcv_nxt); 11885 if (adv > oldwin) 11886 adv -= oldwin; 11887 else { 11888 /* We can't increase the window */ 11889 adv = 0; 11890 } 11891 } else 11892 oldwin = 0; 11893 11894 /* 11895 * If the new window size ends up being the same as or less 11896 * than the old size when it is scaled, then don't force 11897 * a window update. 11898 */ 11899 if (oldwin >> tp->rcv_scale >= (adv + oldwin) >> tp->rcv_scale) 11900 return (0); 11901 11902 if (adv >= (2 * maxseg) && 11903 (adv >= (so->so_rcv.sb_hiwat / 4) || 11904 recwin <= (so->so_rcv.sb_hiwat / 8) || 11905 so->so_rcv.sb_hiwat <= 8 * maxseg)) { 11906 return (1); 11907 } 11908 if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) 11909 return (1); 11910 return (0); 11911 } 11912 11913 /* 11914 * Return 0 on success and a errno on failure to send. 11915 * Note that a 0 return may not mean we sent anything 11916 * if the TCB was on the hpts. A non-zero return 11917 * does indicate the error we got from ip[6]_output. 11918 */ 11919 static int 11920 bbr_output_wtime(struct tcpcb *tp, const struct timeval *tv) 11921 { 11922 struct socket *so; 11923 int32_t len; 11924 uint32_t cts; 11925 uint32_t recwin, sendwin; 11926 int32_t sb_offset; 11927 int32_t flags, abandon, error = 0; 11928 struct tcp_log_buffer *lgb = NULL; 11929 struct mbuf *m; 11930 struct mbuf *mb; 11931 uint32_t if_hw_tsomaxsegcount = 0; 11932 uint32_t if_hw_tsomaxsegsize = 0; 11933 uint32_t if_hw_tsomax = 0; 11934 struct ip *ip = NULL; 11935 #ifdef TCPDEBUG 11936 struct ipovly *ipov = NULL; 11937 #endif 11938 struct tcp_bbr *bbr; 11939 struct tcphdr *th; 11940 struct udphdr *udp = NULL; 11941 u_char opt[TCP_MAXOLEN]; 11942 unsigned ipoptlen, optlen, hdrlen; 11943 unsigned ulen; 11944 uint32_t bbr_seq; 11945 uint32_t delay_calc=0; 11946 uint8_t doing_tlp = 0; 11947 uint8_t local_options; 11948 #ifdef BBR_INVARIANTS 11949 uint8_t doing_retran_from = 0; 11950 uint8_t picked_up_retran = 0; 11951 #endif 11952 uint8_t wanted_cookie = 0; 11953 uint8_t more_to_rxt=0; 11954 int32_t prefetch_so_done = 0; 11955 int32_t prefetch_rsm = 0; 11956 uint32_t what_we_can = 0; 11957 uint32_t tot_len = 0; 11958 uint32_t rtr_cnt = 0; 11959 uint32_t maxseg, pace_max_segs, p_maxseg; 11960 int32_t csum_flags = 0; 11961 int32_t hw_tls; 11962 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 11963 unsigned ipsec_optlen = 0; 11964 11965 #endif 11966 volatile int32_t sack_rxmit; 11967 struct bbr_sendmap *rsm = NULL; 11968 int32_t tso, mtu; 11969 struct tcpopt to; 11970 int32_t slot = 0; 11971 struct inpcb *inp; 11972 struct sockbuf *sb; 11973 uint32_t hpts_calling; 11974 #ifdef INET6 11975 struct ip6_hdr *ip6 = NULL; 11976 int32_t isipv6; 11977 #endif 11978 uint8_t app_limited = BBR_JR_SENT_DATA; 11979 uint8_t filled_all = 0; 11980 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 11981 /* We take a cache hit here */ 11982 memcpy(&bbr->rc_tv, tv, sizeof(struct timeval)); 11983 cts = tcp_tv_to_usectick(&bbr->rc_tv); 11984 inp = bbr->rc_inp; 11985 so = inp->inp_socket; 11986 sb = &so->so_snd; 11987 if (sb->sb_flags & SB_TLS_IFNET) 11988 hw_tls = 1; 11989 else 11990 hw_tls = 0; 11991 kern_prefetch(sb, &maxseg); 11992 maxseg = tp->t_maxseg - bbr->rc_last_options; 11993 if (bbr_minseg(bbr) < maxseg) { 11994 tcp_bbr_tso_size_check(bbr, cts); 11995 } 11996 /* Remove any flags that indicate we are pacing on the inp */ 11997 pace_max_segs = bbr->r_ctl.rc_pace_max_segs; 11998 p_maxseg = min(maxseg, pace_max_segs); 11999 INP_WLOCK_ASSERT(inp); 12000 #ifdef TCP_OFFLOAD 12001 if (tp->t_flags & TF_TOE) 12002 return (tcp_offload_output(tp)); 12003 #endif 12004 12005 #ifdef INET6 12006 if (bbr->r_state) { 12007 /* Use the cache line loaded if possible */ 12008 isipv6 = bbr->r_is_v6; 12009 } else { 12010 isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 12011 } 12012 #endif 12013 if (((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) && 12014 inp->inp_in_hpts) { 12015 /* 12016 * We are on the hpts for some timer but not hptsi output. 12017 * Possibly remove from the hpts so we can send/recv etc. 12018 */ 12019 if ((tp->t_flags & TF_ACKNOW) == 0) { 12020 /* 12021 * No immediate demand right now to send an ack, but 12022 * the user may have read, making room for new data 12023 * (a window update). If so we may want to cancel 12024 * whatever timer is running (KEEP/DEL-ACK?) and 12025 * continue to send out a window update. Or we may 12026 * have gotten more data into the socket buffer to 12027 * send. 12028 */ 12029 recwin = lmin(lmax(sbspace(&so->so_rcv), 0), 12030 (long)TCP_MAXWIN << tp->rcv_scale); 12031 if ((bbr_window_update_needed(tp, so, recwin, maxseg) == 0) && 12032 ((tcp_outflags[tp->t_state] & TH_RST) == 0) && 12033 ((sbavail(sb) + ((tcp_outflags[tp->t_state] & TH_FIN) ? 1 : 0)) <= 12034 (tp->snd_max - tp->snd_una))) { 12035 /* 12036 * Nothing new to send and no window update 12037 * is needed to send. Lets just return and 12038 * let the timer-run off. 12039 */ 12040 return (0); 12041 } 12042 } 12043 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12044 bbr_timer_cancel(bbr, __LINE__, cts); 12045 } 12046 if (bbr->r_ctl.rc_last_delay_val) { 12047 /* Calculate a rough delay for early escape to sending */ 12048 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12049 delay_calc = cts - bbr->rc_pacer_started; 12050 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12051 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12052 else 12053 delay_calc = 0; 12054 } 12055 /* Mark that we have called bbr_output(). */ 12056 if ((bbr->r_timer_override) || 12057 (tp->t_state < TCPS_ESTABLISHED)) { 12058 /* Timeouts or early states are exempt */ 12059 if (inp->inp_in_hpts) 12060 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12061 } else if (inp->inp_in_hpts) { 12062 if ((bbr->r_ctl.rc_last_delay_val) && 12063 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && 12064 delay_calc) { 12065 /* 12066 * We were being paced for output and the delay has 12067 * already exceeded when we were supposed to be 12068 * called, lets go ahead and pull out of the hpts 12069 * and call output. 12070 */ 12071 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_LATE], 1); 12072 bbr->r_ctl.rc_last_delay_val = 0; 12073 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12074 } else if (tp->t_state == TCPS_CLOSED) { 12075 bbr->r_ctl.rc_last_delay_val = 0; 12076 tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); 12077 } else { 12078 /* 12079 * On the hpts, you shall not pass! even if ACKNOW 12080 * is on, we will when the hpts fires, unless of 12081 * course we are overdue. 12082 */ 12083 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_INPACE], 1); 12084 return (0); 12085 } 12086 } 12087 bbr->rc_cwnd_limited = 0; 12088 if (bbr->r_ctl.rc_last_delay_val) { 12089 /* recalculate the real delay and deal with over/under */ 12090 if (SEQ_GT(cts, bbr->rc_pacer_started)) 12091 delay_calc = cts - bbr->rc_pacer_started; 12092 else 12093 delay_calc = 0; 12094 if (delay_calc >= bbr->r_ctl.rc_last_delay_val) 12095 /* Setup the delay which will be added in */ 12096 delay_calc -= bbr->r_ctl.rc_last_delay_val; 12097 else { 12098 /* 12099 * We are early setup to adjust 12100 * our slot time. 12101 */ 12102 uint64_t merged_val; 12103 12104 bbr->r_ctl.rc_agg_early += (bbr->r_ctl.rc_last_delay_val - delay_calc); 12105 bbr->r_agg_early_set = 1; 12106 if (bbr->r_ctl.rc_hptsi_agg_delay) { 12107 if (bbr->r_ctl.rc_hptsi_agg_delay >= bbr->r_ctl.rc_agg_early) { 12108 /* Nope our previous late cancels out the early */ 12109 bbr->r_ctl.rc_hptsi_agg_delay -= bbr->r_ctl.rc_agg_early; 12110 bbr->r_agg_early_set = 0; 12111 bbr->r_ctl.rc_agg_early = 0; 12112 } else { 12113 bbr->r_ctl.rc_agg_early -= bbr->r_ctl.rc_hptsi_agg_delay; 12114 bbr->r_ctl.rc_hptsi_agg_delay = 0; 12115 } 12116 } 12117 merged_val = bbr->rc_pacer_started; 12118 merged_val <<= 32; 12119 merged_val |= bbr->r_ctl.rc_last_delay_val; 12120 bbr_log_pacing_delay_calc(bbr, inp->inp_hpts_calls, 12121 bbr->r_ctl.rc_agg_early, cts, delay_calc, merged_val, 12122 bbr->r_agg_early_set, 3); 12123 bbr->r_ctl.rc_last_delay_val = 0; 12124 BBR_STAT_INC(bbr_early); 12125 delay_calc = 0; 12126 } 12127 } else { 12128 /* We were not delayed due to hptsi */ 12129 if (bbr->r_agg_early_set) 12130 bbr->r_ctl.rc_agg_early = 0; 12131 bbr->r_agg_early_set = 0; 12132 delay_calc = 0; 12133 } 12134 if (delay_calc) { 12135 /* 12136 * We had a hptsi delay which means we are falling behind on 12137 * sending at the expected rate. Calculate an extra amount 12138 * of data we can send, if any, to put us back on track. 12139 */ 12140 if ((bbr->r_ctl.rc_hptsi_agg_delay + delay_calc) < bbr->r_ctl.rc_hptsi_agg_delay) 12141 bbr->r_ctl.rc_hptsi_agg_delay = 0xffffffff; 12142 else 12143 bbr->r_ctl.rc_hptsi_agg_delay += delay_calc; 12144 } 12145 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12146 if ((tp->snd_una == tp->snd_max) && 12147 (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && 12148 (sbavail(sb))) { 12149 /* 12150 * Ok we have been idle with nothing outstanding 12151 * we possibly need to start fresh with either a new 12152 * suite of states or a fast-ramp up. 12153 */ 12154 bbr_restart_after_idle(bbr, 12155 cts, bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time)); 12156 } 12157 /* 12158 * Now was there a hptsi delay where we are behind? We only count 12159 * being behind if: a) We are not in recovery. b) There was a delay. 12160 * <and> c) We had room to send something. 12161 * 12162 */ 12163 hpts_calling = inp->inp_hpts_calls; 12164 inp->inp_hpts_calls = 0; 12165 if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { 12166 if (bbr_process_timers(tp, bbr, cts, hpts_calling)) { 12167 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_ATIMER], 1); 12168 return (0); 12169 } 12170 } 12171 bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; 12172 if (hpts_calling && 12173 (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { 12174 bbr->r_ctl.rc_last_delay_val = 0; 12175 } 12176 bbr->r_timer_override = 0; 12177 bbr->r_wanted_output = 0; 12178 /* 12179 * For TFO connections in SYN_RECEIVED, only allow the initial 12180 * SYN|ACK and those sent by the retransmit timer. 12181 */ 12182 if (IS_FASTOPEN(tp->t_flags) && 12183 ((tp->t_state == TCPS_SYN_RECEIVED) || 12184 (tp->t_state == TCPS_SYN_SENT)) && 12185 SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN or SYN|ACK sent */ 12186 (tp->t_rxtshift == 0)) { /* not a retransmit */ 12187 len = 0; 12188 goto just_return_nolock; 12189 } 12190 /* 12191 * Before sending anything check for a state update. For hpts 12192 * calling without input this is important. If its input calling 12193 * then this was already done. 12194 */ 12195 if (bbr->rc_use_google == 0) 12196 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 12197 again: 12198 /* 12199 * If we've recently taken a timeout, snd_max will be greater than 12200 * snd_max. BBR in general does not pay much attention to snd_nxt 12201 * for historic reasons the persist timer still uses it. This means 12202 * we have to look at it. All retransmissions that are not persits 12203 * use the rsm that needs to be sent so snd_nxt is ignored. At the 12204 * end of this routine we pull snd_nxt always up to snd_max. 12205 */ 12206 doing_tlp = 0; 12207 #ifdef BBR_INVARIANTS 12208 doing_retran_from = picked_up_retran = 0; 12209 #endif 12210 error = 0; 12211 tso = 0; 12212 slot = 0; 12213 mtu = 0; 12214 sendwin = min(tp->snd_wnd, tp->snd_cwnd); 12215 sb_offset = tp->snd_max - tp->snd_una; 12216 flags = tcp_outflags[tp->t_state]; 12217 sack_rxmit = 0; 12218 len = 0; 12219 rsm = NULL; 12220 if (flags & TH_RST) { 12221 SOCKBUF_LOCK(sb); 12222 goto send; 12223 } 12224 recheck_resend: 12225 while (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { 12226 /* We need to always have one in reserve */ 12227 rsm = bbr_alloc(bbr); 12228 if (rsm == NULL) { 12229 error = ENOMEM; 12230 /* Lie to get on the hpts */ 12231 tot_len = tp->t_maxseg; 12232 if (hpts_calling) 12233 /* Retry in a ms */ 12234 slot = 1001; 12235 goto just_return_nolock; 12236 } 12237 TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); 12238 bbr->r_ctl.rc_free_cnt++; 12239 rsm = NULL; 12240 } 12241 /* What do we send, a resend? */ 12242 if (bbr->r_ctl.rc_resend == NULL) { 12243 /* Check for rack timeout */ 12244 bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); 12245 if (bbr->r_ctl.rc_resend) { 12246 #ifdef BBR_INVARIANTS 12247 picked_up_retran = 1; 12248 #endif 12249 bbr_cong_signal(tp, NULL, CC_NDUPACK, bbr->r_ctl.rc_resend); 12250 } 12251 } 12252 if (bbr->r_ctl.rc_resend) { 12253 rsm = bbr->r_ctl.rc_resend; 12254 #ifdef BBR_INVARIANTS 12255 doing_retran_from = 1; 12256 #endif 12257 /* Remove any TLP flags its a RACK or T-O */ 12258 rsm->r_flags &= ~BBR_TLP; 12259 bbr->r_ctl.rc_resend = NULL; 12260 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 12261 #ifdef BBR_INVARIANTS 12262 panic("Huh, tp:%p bbr:%p rsm:%p start:%u < snd_una:%u\n", 12263 tp, bbr, rsm, rsm->r_start, tp->snd_una); 12264 goto recheck_resend; 12265 #else 12266 /* TSNH */ 12267 rsm = NULL; 12268 goto recheck_resend; 12269 #endif 12270 } 12271 rtr_cnt++; 12272 if (rsm->r_flags & BBR_HAS_SYN) { 12273 /* Only retransmit a SYN by itself */ 12274 len = 0; 12275 if ((flags & TH_SYN) == 0) { 12276 /* Huh something is wrong */ 12277 rsm->r_start++; 12278 if (rsm->r_start == rsm->r_end) { 12279 /* Clean it up, somehow we missed the ack? */ 12280 bbr_log_syn(tp, NULL); 12281 } else { 12282 /* TFO with data? */ 12283 rsm->r_flags &= ~BBR_HAS_SYN; 12284 len = rsm->r_end - rsm->r_start; 12285 } 12286 } else { 12287 /* Retransmitting SYN */ 12288 rsm = NULL; 12289 SOCKBUF_LOCK(sb); 12290 goto send; 12291 } 12292 } else 12293 len = rsm->r_end - rsm->r_start; 12294 if ((bbr->rc_resends_use_tso == 0) && 12295 (len > maxseg)) { 12296 len = maxseg; 12297 more_to_rxt = 1; 12298 } 12299 sb_offset = rsm->r_start - tp->snd_una; 12300 if (len > 0) { 12301 sack_rxmit = 1; 12302 KMOD_TCPSTAT_INC(tcps_sack_rexmits); 12303 KMOD_TCPSTAT_ADD(tcps_sack_rexmit_bytes, 12304 min(len, maxseg)); 12305 } else { 12306 /* I dont think this can happen */ 12307 rsm = NULL; 12308 goto recheck_resend; 12309 } 12310 BBR_STAT_INC(bbr_resends_set); 12311 } else if (bbr->r_ctl.rc_tlp_send) { 12312 /* 12313 * Tail loss probe 12314 */ 12315 doing_tlp = 1; 12316 rsm = bbr->r_ctl.rc_tlp_send; 12317 bbr->r_ctl.rc_tlp_send = NULL; 12318 sack_rxmit = 1; 12319 len = rsm->r_end - rsm->r_start; 12320 rtr_cnt++; 12321 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12322 len = maxseg; 12323 12324 if (SEQ_GT(tp->snd_una, rsm->r_start)) { 12325 #ifdef BBR_INVARIANTS 12326 panic("tp:%p bbc:%p snd_una:%u rsm:%p r_start:%u", 12327 tp, bbr, tp->snd_una, rsm, rsm->r_start); 12328 #else 12329 /* TSNH */ 12330 rsm = NULL; 12331 goto recheck_resend; 12332 #endif 12333 } 12334 sb_offset = rsm->r_start - tp->snd_una; 12335 BBR_STAT_INC(bbr_tlp_set); 12336 } 12337 /* 12338 * Enforce a connection sendmap count limit if set 12339 * as long as we are not retransmiting. 12340 */ 12341 if ((rsm == NULL) && 12342 (V_tcp_map_entries_limit > 0) && 12343 (bbr->r_ctl.rc_num_maps_alloced >= V_tcp_map_entries_limit)) { 12344 BBR_STAT_INC(bbr_alloc_limited); 12345 if (!bbr->alloc_limit_reported) { 12346 bbr->alloc_limit_reported = 1; 12347 BBR_STAT_INC(bbr_alloc_limited_conns); 12348 } 12349 goto just_return_nolock; 12350 } 12351 #ifdef BBR_INVARIANTS 12352 if (rsm && SEQ_LT(rsm->r_start, tp->snd_una)) { 12353 panic("tp:%p bbr:%p rsm:%p sb_offset:%u len:%u", 12354 tp, bbr, rsm, sb_offset, len); 12355 } 12356 #endif 12357 /* 12358 * Get standard flags, and add SYN or FIN if requested by 'hidden' 12359 * state flags. 12360 */ 12361 if (tp->t_flags & TF_NEEDFIN && (rsm == NULL)) 12362 flags |= TH_FIN; 12363 if (tp->t_flags & TF_NEEDSYN) 12364 flags |= TH_SYN; 12365 12366 if (rsm && (rsm->r_flags & BBR_HAS_FIN)) { 12367 /* we are retransmitting the fin */ 12368 len--; 12369 if (len) { 12370 /* 12371 * When retransmitting data do *not* include the 12372 * FIN. This could happen from a TLP probe if we 12373 * allowed data with a FIN. 12374 */ 12375 flags &= ~TH_FIN; 12376 } 12377 } else if (rsm) { 12378 if (flags & TH_FIN) 12379 flags &= ~TH_FIN; 12380 } 12381 if ((sack_rxmit == 0) && (prefetch_rsm == 0)) { 12382 void *end_rsm; 12383 12384 end_rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); 12385 if (end_rsm) 12386 kern_prefetch(end_rsm, &prefetch_rsm); 12387 prefetch_rsm = 1; 12388 } 12389 SOCKBUF_LOCK(sb); 12390 /* 12391 * If snd_nxt == snd_max and we have transmitted a FIN, the 12392 * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a 12393 * negative length. This can also occur when TCP opens up its 12394 * congestion window while receiving additional duplicate acks after 12395 * fast-retransmit because TCP will reset snd_nxt to snd_max after 12396 * the fast-retransmit. 12397 * 12398 * In the normal retransmit-FIN-only case, however, snd_nxt will be 12399 * set to snd_una, the sb_offset will be 0, and the length may wind 12400 * up 0. 12401 * 12402 * If sack_rxmit is true we are retransmitting from the scoreboard 12403 * in which case len is already set. 12404 */ 12405 if (sack_rxmit == 0) { 12406 uint32_t avail; 12407 12408 avail = sbavail(sb); 12409 if (SEQ_GT(tp->snd_max, tp->snd_una)) 12410 sb_offset = tp->snd_max - tp->snd_una; 12411 else 12412 sb_offset = 0; 12413 if (bbr->rc_tlp_new_data) { 12414 /* TLP is forcing out new data */ 12415 uint32_t tlplen; 12416 12417 doing_tlp = 1; 12418 tlplen = maxseg; 12419 12420 if (tlplen > (uint32_t)(avail - sb_offset)) { 12421 tlplen = (uint32_t)(avail - sb_offset); 12422 } 12423 if (tlplen > tp->snd_wnd) { 12424 len = tp->snd_wnd; 12425 } else { 12426 len = tlplen; 12427 } 12428 bbr->rc_tlp_new_data = 0; 12429 } else { 12430 what_we_can = len = bbr_what_can_we_send(tp, bbr, sendwin, avail, sb_offset, cts); 12431 if ((len < p_maxseg) && 12432 (bbr->rc_in_persist == 0) && 12433 (ctf_outstanding(tp) >= (2 * p_maxseg)) && 12434 ((avail - sb_offset) >= p_maxseg)) { 12435 /* 12436 * We are not completing whats in the socket 12437 * buffer (i.e. there is at least a segment 12438 * waiting to send) and we have 2 or more 12439 * segments outstanding. There is no sense 12440 * of sending a little piece. Lets defer and 12441 * and wait until we can send a whole 12442 * segment. 12443 */ 12444 len = 0; 12445 } 12446 if (bbr->rc_in_persist) { 12447 /* 12448 * We are in persists, figure out if 12449 * a retransmit is available (maybe the previous 12450 * persists we sent) or if we have to send new 12451 * data. 12452 */ 12453 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 12454 if (rsm) { 12455 len = rsm->r_end - rsm->r_start; 12456 if (rsm->r_flags & BBR_HAS_FIN) 12457 len--; 12458 if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) 12459 len = maxseg; 12460 if (len > 1) 12461 BBR_STAT_INC(bbr_persist_reneg); 12462 /* 12463 * XXXrrs we could force the len to 12464 * 1 byte here to cause the chunk to 12465 * split apart.. but that would then 12466 * mean we always retransmit it as 12467 * one byte even after the window 12468 * opens. 12469 */ 12470 sack_rxmit = 1; 12471 sb_offset = rsm->r_start - tp->snd_una; 12472 } else { 12473 /* 12474 * First time through in persists or peer 12475 * acked our one byte. Though we do have 12476 * to have something in the sb. 12477 */ 12478 len = 1; 12479 sb_offset = 0; 12480 if (avail == 0) 12481 len = 0; 12482 } 12483 } 12484 } 12485 } 12486 if (prefetch_so_done == 0) { 12487 kern_prefetch(so, &prefetch_so_done); 12488 prefetch_so_done = 1; 12489 } 12490 /* 12491 * Lop off SYN bit if it has already been sent. However, if this is 12492 * SYN-SENT state and if segment contains data and if we don't know 12493 * that foreign host supports TAO, suppress sending segment. 12494 */ 12495 if ((flags & TH_SYN) && (rsm == NULL) && 12496 SEQ_GT(tp->snd_max, tp->snd_una)) { 12497 if (tp->t_state != TCPS_SYN_RECEIVED) 12498 flags &= ~TH_SYN; 12499 /* 12500 * When sending additional segments following a TFO SYN|ACK, 12501 * do not include the SYN bit. 12502 */ 12503 if (IS_FASTOPEN(tp->t_flags) && 12504 (tp->t_state == TCPS_SYN_RECEIVED)) 12505 flags &= ~TH_SYN; 12506 sb_offset--, len++; 12507 if (sbavail(sb) == 0) 12508 len = 0; 12509 } else if ((flags & TH_SYN) && rsm) { 12510 /* 12511 * Subtract one from the len for the SYN being 12512 * retransmitted. 12513 */ 12514 len--; 12515 } 12516 /* 12517 * Be careful not to send data and/or FIN on SYN segments. This 12518 * measure is needed to prevent interoperability problems with not 12519 * fully conformant TCP implementations. 12520 */ 12521 if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) { 12522 len = 0; 12523 flags &= ~TH_FIN; 12524 } 12525 /* 12526 * On TFO sockets, ensure no data is sent in the following cases: 12527 * 12528 * - When retransmitting SYN|ACK on a passively-created socket 12529 * - When retransmitting SYN on an actively created socket 12530 * - When sending a zero-length cookie (cookie request) on an 12531 * actively created socket 12532 * - When the socket is in the CLOSED state (RST is being sent) 12533 */ 12534 if (IS_FASTOPEN(tp->t_flags) && 12535 (((flags & TH_SYN) && (tp->t_rxtshift > 0)) || 12536 ((tp->t_state == TCPS_SYN_SENT) && 12537 (tp->t_tfo_client_cookie_len == 0)) || 12538 (flags & TH_RST))) { 12539 len = 0; 12540 sack_rxmit = 0; 12541 rsm = NULL; 12542 } 12543 /* Without fast-open there should never be data sent on a SYN */ 12544 if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) 12545 len = 0; 12546 if (len <= 0) { 12547 /* 12548 * If FIN has been sent but not acked, but we haven't been 12549 * called to retransmit, len will be < 0. Otherwise, window 12550 * shrank after we sent into it. If window shrank to 0, 12551 * cancel pending retransmit, pull snd_nxt back to (closed) 12552 * window, and set the persist timer if it isn't already 12553 * going. If the window didn't close completely, just wait 12554 * for an ACK. 12555 * 12556 * We also do a general check here to ensure that we will 12557 * set the persist timer when we have data to send, but a 12558 * 0-byte window. This makes sure the persist timer is set 12559 * even if the packet hits one of the "goto send" lines 12560 * below. 12561 */ 12562 len = 0; 12563 if ((tp->snd_wnd == 0) && 12564 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12565 (tp->snd_una == tp->snd_max) && 12566 (sb_offset < (int)sbavail(sb))) { 12567 /* 12568 * Not enough room in the rwnd to send 12569 * a paced segment out. 12570 */ 12571 bbr_enter_persist(tp, bbr, cts, __LINE__); 12572 } 12573 } else if ((rsm == NULL) && 12574 (doing_tlp == 0) && 12575 (len < bbr->r_ctl.rc_pace_max_segs)) { 12576 /* 12577 * We are not sending a full segment for 12578 * some reason. Should we not send anything (think 12579 * sws or persists)? 12580 */ 12581 if ((tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12582 (TCPS_HAVEESTABLISHED(tp->t_state)) && 12583 (len < (int)(sbavail(sb) - sb_offset))) { 12584 /* 12585 * Here the rwnd is less than 12586 * the pacing size, this is not a retransmit, 12587 * we are established and 12588 * the send is not the last in the socket buffer 12589 * lets not send, and possibly enter persists. 12590 */ 12591 len = 0; 12592 if (tp->snd_max == tp->snd_una) 12593 bbr_enter_persist(tp, bbr, cts, __LINE__); 12594 } else if ((tp->snd_cwnd >= bbr->r_ctl.rc_pace_max_segs) && 12595 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12596 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12597 (len < (int)(sbavail(sb) - sb_offset)) && 12598 (len < bbr_minseg(bbr))) { 12599 /* 12600 * Here we are not retransmitting, and 12601 * the cwnd is not so small that we could 12602 * not send at least a min size (rxt timer 12603 * not having gone off), We have 2 segments or 12604 * more already in flight, its not the tail end 12605 * of the socket buffer and the cwnd is blocking 12606 * us from sending out minimum pacing segment size. 12607 * Lets not send anything. 12608 */ 12609 bbr->rc_cwnd_limited = 1; 12610 len = 0; 12611 } else if (((tp->snd_wnd - ctf_outstanding(tp)) < 12612 min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && 12613 (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12614 bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && 12615 (len < (int)(sbavail(sb) - sb_offset)) && 12616 (TCPS_HAVEESTABLISHED(tp->t_state))) { 12617 /* 12618 * Here we have a send window but we have 12619 * filled it up and we can't send another pacing segment. 12620 * We also have in flight more than 2 segments 12621 * and we are not completing the sb i.e. we allow 12622 * the last bytes of the sb to go out even if 12623 * its not a full pacing segment. 12624 */ 12625 len = 0; 12626 } 12627 } 12628 /* len will be >= 0 after this point. */ 12629 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 12630 tcp_sndbuf_autoscale(tp, so, sendwin); 12631 /* 12632 * 12633 */ 12634 if (bbr->rc_in_persist && 12635 len && 12636 (rsm == NULL) && 12637 (len < min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs))) { 12638 /* 12639 * We are in persist, not doing a retransmit and don't have enough space 12640 * yet to send a full TSO. So is it at the end of the sb 12641 * if so we need to send else nuke to 0 and don't send. 12642 */ 12643 int sbleft; 12644 if (sbavail(sb) > sb_offset) 12645 sbleft = sbavail(sb) - sb_offset; 12646 else 12647 sbleft = 0; 12648 if (sbleft >= min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs)) { 12649 /* not at end of sb lets not send */ 12650 len = 0; 12651 } 12652 } 12653 /* 12654 * Decide if we can use TCP Segmentation Offloading (if supported by 12655 * hardware). 12656 * 12657 * TSO may only be used if we are in a pure bulk sending state. The 12658 * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP 12659 * options prevent using TSO. With TSO the TCP header is the same 12660 * (except for the sequence number) for all generated packets. This 12661 * makes it impossible to transmit any options which vary per 12662 * generated segment or packet. 12663 * 12664 * IPv4 handling has a clear separation of ip options and ip header 12665 * flags while IPv6 combines both in in6p_outputopts. ip6_optlen() 12666 * does the right thing below to provide length of just ip options 12667 * and thus checking for ipoptlen is enough to decide if ip options 12668 * are present. 12669 */ 12670 #ifdef INET6 12671 if (isipv6) 12672 ipoptlen = ip6_optlen(inp); 12673 else 12674 #endif 12675 if (inp->inp_options) 12676 ipoptlen = inp->inp_options->m_len - 12677 offsetof(struct ipoption, ipopt_list); 12678 else 12679 ipoptlen = 0; 12680 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12681 /* 12682 * Pre-calculate here as we save another lookup into the darknesses 12683 * of IPsec that way and can actually decide if TSO is ok. 12684 */ 12685 #ifdef INET6 12686 if (isipv6 && IPSEC_ENABLED(ipv6)) 12687 ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp); 12688 #ifdef INET 12689 else 12690 #endif 12691 #endif /* INET6 */ 12692 #ifdef INET 12693 if (IPSEC_ENABLED(ipv4)) 12694 ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp); 12695 #endif /* INET */ 12696 #endif /* IPSEC */ 12697 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 12698 ipoptlen += ipsec_optlen; 12699 #endif 12700 if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && 12701 (len > maxseg) && 12702 (tp->t_port == 0) && 12703 ((tp->t_flags & TF_SIGNATURE) == 0) && 12704 tp->rcv_numsacks == 0 && 12705 ipoptlen == 0) 12706 tso = 1; 12707 12708 recwin = lmin(lmax(sbspace(&so->so_rcv), 0), 12709 (long)TCP_MAXWIN << tp->rcv_scale); 12710 /* 12711 * Sender silly window avoidance. We transmit under the following 12712 * conditions when len is non-zero: 12713 * 12714 * - We have a full segment (or more with TSO) - This is the last 12715 * buffer in a write()/send() and we are either idle or running 12716 * NODELAY - we've timed out (e.g. persist timer) - we have more 12717 * then 1/2 the maximum send window's worth of data (receiver may be 12718 * limited the window size) - we need to retransmit 12719 */ 12720 if (rsm) 12721 goto send; 12722 if (len) { 12723 if (sack_rxmit) 12724 goto send; 12725 if (len >= p_maxseg) 12726 goto send; 12727 /* 12728 * NOTE! on localhost connections an 'ack' from the remote 12729 * end may occur synchronously with the output and cause us 12730 * to flush a buffer queued with moretocome. XXX 12731 * 12732 */ 12733 if (((tp->t_flags & TF_MORETOCOME) == 0) && /* normal case */ 12734 ((tp->t_flags & TF_NODELAY) || 12735 ((uint32_t)len + (uint32_t)sb_offset) >= sbavail(&so->so_snd)) && 12736 (tp->t_flags & TF_NOPUSH) == 0) { 12737 goto send; 12738 } 12739 if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */ 12740 goto send; 12741 } 12742 if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) { 12743 goto send; 12744 } 12745 } 12746 /* 12747 * Sending of standalone window updates. 12748 * 12749 * Window updates are important when we close our window due to a 12750 * full socket buffer and are opening it again after the application 12751 * reads data from it. Once the window has opened again and the 12752 * remote end starts to send again the ACK clock takes over and 12753 * provides the most current window information. 12754 * 12755 * We must avoid the silly window syndrome whereas every read from 12756 * the receive buffer, no matter how small, causes a window update 12757 * to be sent. We also should avoid sending a flurry of window 12758 * updates when the socket buffer had queued a lot of data and the 12759 * application is doing small reads. 12760 * 12761 * Prevent a flurry of pointless window updates by only sending an 12762 * update when we can increase the advertized window by more than 12763 * 1/4th of the socket buffer capacity. When the buffer is getting 12764 * full or is very small be more aggressive and send an update 12765 * whenever we can increase by two mss sized segments. In all other 12766 * situations the ACK's to new incoming data will carry further 12767 * window increases. 12768 * 12769 * Don't send an independent window update if a delayed ACK is 12770 * pending (it will get piggy-backed on it) or the remote side 12771 * already has done a half-close and won't send more data. Skip 12772 * this if the connection is in T/TCP half-open state. 12773 */ 12774 if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) && 12775 !(tp->t_flags & TF_DELACK) && 12776 !TCPS_HAVERCVDFIN(tp->t_state)) { 12777 /* Check to see if we should do a window update */ 12778 if (bbr_window_update_needed(tp, so, recwin, maxseg)) 12779 goto send; 12780 } 12781 /* 12782 * Send if we owe the peer an ACK, RST, SYN. ACKNOW 12783 * is also a catch-all for the retransmit timer timeout case. 12784 */ 12785 if (tp->t_flags & TF_ACKNOW) { 12786 goto send; 12787 } 12788 if (flags & TH_RST) { 12789 /* Always send a RST if one is due */ 12790 goto send; 12791 } 12792 if ((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0) { 12793 goto send; 12794 } 12795 /* 12796 * If our state indicates that FIN should be sent and we have not 12797 * yet done so, then we need to send. 12798 */ 12799 if (flags & TH_FIN && 12800 ((tp->t_flags & TF_SENTFIN) == 0)) { 12801 goto send; 12802 } 12803 /* 12804 * No reason to send a segment, just return. 12805 */ 12806 just_return: 12807 SOCKBUF_UNLOCK(sb); 12808 just_return_nolock: 12809 if (tot_len) 12810 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 12811 if (bbr->rc_no_pacing) 12812 slot = 0; 12813 if (tot_len == 0) { 12814 if ((ctf_outstanding(tp) + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) >= 12815 tp->snd_wnd) { 12816 BBR_STAT_INC(bbr_rwnd_limited); 12817 app_limited = BBR_JR_RWND_LIMITED; 12818 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12819 if ((bbr->rc_in_persist == 0) && 12820 TCPS_HAVEESTABLISHED(tp->t_state) && 12821 (tp->snd_max == tp->snd_una) && 12822 sbavail(&tp->t_inpcb->inp_socket->so_snd)) { 12823 /* No send window.. we must enter persist */ 12824 bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); 12825 } 12826 } else if (ctf_outstanding(tp) >= sbavail(sb)) { 12827 BBR_STAT_INC(bbr_app_limited); 12828 app_limited = BBR_JR_APP_LIMITED; 12829 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12830 } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12831 bbr->r_ctl.rc_lost_bytes)) + p_maxseg) >= tp->snd_cwnd) { 12832 BBR_STAT_INC(bbr_cwnd_limited); 12833 app_limited = BBR_JR_CWND_LIMITED; 12834 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12835 bbr->r_ctl.rc_lost_bytes))); 12836 bbr->rc_cwnd_limited = 1; 12837 } else { 12838 BBR_STAT_INC(bbr_app_limited); 12839 app_limited = BBR_JR_APP_LIMITED; 12840 bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); 12841 } 12842 bbr->r_ctl.rc_hptsi_agg_delay = 0; 12843 bbr->r_agg_early_set = 0; 12844 bbr->r_ctl.rc_agg_early = 0; 12845 bbr->r_ctl.rc_last_delay_val = 0; 12846 } else if (bbr->rc_use_google == 0) 12847 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 12848 /* Are we app limited? */ 12849 if ((app_limited == BBR_JR_APP_LIMITED) || 12850 (app_limited == BBR_JR_RWND_LIMITED)) { 12851 /** 12852 * We are application limited. 12853 */ 12854 bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 12855 bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_delivered); 12856 } 12857 if (tot_len == 0) 12858 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_JUSTRET], 1); 12859 /* Dont update the time if we did not send */ 12860 bbr->r_ctl.rc_last_delay_val = 0; 12861 bbr->rc_output_starts_timer = 1; 12862 bbr_start_hpts_timer(bbr, tp, cts, 9, slot, tot_len); 12863 bbr_log_type_just_return(bbr, cts, tot_len, hpts_calling, app_limited, p_maxseg, len); 12864 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 12865 /* Make sure snd_nxt is drug up */ 12866 tp->snd_nxt = tp->snd_max; 12867 } 12868 return (error); 12869 12870 send: 12871 if (doing_tlp == 0) { 12872 /* 12873 * Data not a TLP, and its not the rxt firing. If it is the 12874 * rxt firing, we want to leave the tlp_in_progress flag on 12875 * so we don't send another TLP. It has to be a rack timer 12876 * or normal send (response to acked data) to clear the tlp 12877 * in progress flag. 12878 */ 12879 bbr->rc_tlp_in_progress = 0; 12880 bbr->rc_tlp_rtx_out = 0; 12881 } else { 12882 /* 12883 * Its a TLP. 12884 */ 12885 bbr->rc_tlp_in_progress = 1; 12886 } 12887 bbr_timer_cancel(bbr, __LINE__, cts); 12888 if (rsm == NULL) { 12889 if (sbused(sb) > 0) { 12890 /* 12891 * This is sub-optimal. We only send a stand alone 12892 * FIN on its own segment. 12893 */ 12894 if (flags & TH_FIN) { 12895 flags &= ~TH_FIN; 12896 if ((len == 0) && ((tp->t_flags & TF_ACKNOW) == 0)) { 12897 /* Lets not send this */ 12898 slot = 0; 12899 goto just_return; 12900 } 12901 } 12902 } 12903 } else { 12904 /* 12905 * We do *not* send a FIN on a retransmit if it has data. 12906 * The if clause here where len > 1 should never come true. 12907 */ 12908 if ((len > 0) && 12909 (((rsm->r_flags & BBR_HAS_FIN) == 0) && 12910 (flags & TH_FIN))) { 12911 flags &= ~TH_FIN; 12912 len--; 12913 } 12914 } 12915 SOCKBUF_LOCK_ASSERT(sb); 12916 if (len > 0) { 12917 if ((tp->snd_una == tp->snd_max) && 12918 (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { 12919 /* 12920 * This qualifies as a RTT_PROBE session since we 12921 * drop the data outstanding to nothing and waited 12922 * more than bbr_rtt_probe_time. 12923 */ 12924 bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); 12925 bbr_set_reduced_rtt(bbr, cts, __LINE__); 12926 } 12927 if (len >= maxseg) 12928 tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT; 12929 else 12930 tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT; 12931 } 12932 /* 12933 * Before ESTABLISHED, force sending of initial options unless TCP 12934 * set not to do any options. NOTE: we assume that the IP/TCP header 12935 * plus TCP options always fit in a single mbuf, leaving room for a 12936 * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr) 12937 * + optlen <= MCLBYTES 12938 */ 12939 optlen = 0; 12940 #ifdef INET6 12941 if (isipv6) 12942 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 12943 else 12944 #endif 12945 hdrlen = sizeof(struct tcpiphdr); 12946 12947 /* 12948 * Compute options for segment. We only have to care about SYN and 12949 * established connection segments. Options for SYN-ACK segments 12950 * are handled in TCP syncache. 12951 */ 12952 to.to_flags = 0; 12953 local_options = 0; 12954 if ((tp->t_flags & TF_NOOPT) == 0) { 12955 /* Maximum segment size. */ 12956 if (flags & TH_SYN) { 12957 to.to_mss = tcp_mssopt(&inp->inp_inc); 12958 if (tp->t_port) 12959 to.to_mss -= V_tcp_udp_tunneling_overhead; 12960 to.to_flags |= TOF_MSS; 12961 /* 12962 * On SYN or SYN|ACK transmits on TFO connections, 12963 * only include the TFO option if it is not a 12964 * retransmit, as the presence of the TFO option may 12965 * have caused the original SYN or SYN|ACK to have 12966 * been dropped by a middlebox. 12967 */ 12968 if (IS_FASTOPEN(tp->t_flags) && 12969 (tp->t_rxtshift == 0)) { 12970 if (tp->t_state == TCPS_SYN_RECEIVED) { 12971 to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN; 12972 to.to_tfo_cookie = 12973 (u_int8_t *)&tp->t_tfo_cookie.server; 12974 to.to_flags |= TOF_FASTOPEN; 12975 wanted_cookie = 1; 12976 } else if (tp->t_state == TCPS_SYN_SENT) { 12977 to.to_tfo_len = 12978 tp->t_tfo_client_cookie_len; 12979 to.to_tfo_cookie = 12980 tp->t_tfo_cookie.client; 12981 to.to_flags |= TOF_FASTOPEN; 12982 wanted_cookie = 1; 12983 } 12984 } 12985 } 12986 /* Window scaling. */ 12987 if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { 12988 to.to_wscale = tp->request_r_scale; 12989 to.to_flags |= TOF_SCALE; 12990 } 12991 /* Timestamps. */ 12992 if ((tp->t_flags & TF_RCVD_TSTMP) || 12993 ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { 12994 to.to_tsval = tcp_tv_to_mssectick(&bbr->rc_tv) + tp->ts_offset; 12995 to.to_tsecr = tp->ts_recent; 12996 to.to_flags |= TOF_TS; 12997 local_options += TCPOLEN_TIMESTAMP + 2; 12998 } 12999 /* Set receive buffer autosizing timestamp. */ 13000 if (tp->rfbuf_ts == 0 && 13001 (so->so_rcv.sb_flags & SB_AUTOSIZE)) 13002 tp->rfbuf_ts = tcp_tv_to_mssectick(&bbr->rc_tv); 13003 /* Selective ACK's. */ 13004 if (flags & TH_SYN) 13005 to.to_flags |= TOF_SACKPERM; 13006 else if (TCPS_HAVEESTABLISHED(tp->t_state) && 13007 tp->rcv_numsacks > 0) { 13008 to.to_flags |= TOF_SACK; 13009 to.to_nsacks = tp->rcv_numsacks; 13010 to.to_sacks = (u_char *)tp->sackblks; 13011 } 13012 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13013 /* TCP-MD5 (RFC2385). */ 13014 if (tp->t_flags & TF_SIGNATURE) 13015 to.to_flags |= TOF_SIGNATURE; 13016 #endif /* TCP_SIGNATURE */ 13017 13018 /* Processing the options. */ 13019 hdrlen += (optlen = tcp_addoptions(&to, opt)); 13020 /* 13021 * If we wanted a TFO option to be added, but it was unable 13022 * to fit, ensure no data is sent. 13023 */ 13024 if (IS_FASTOPEN(tp->t_flags) && wanted_cookie && 13025 !(to.to_flags & TOF_FASTOPEN)) 13026 len = 0; 13027 } 13028 if (tp->t_port) { 13029 if (V_tcp_udp_tunneling_port == 0) { 13030 /* The port was removed?? */ 13031 SOCKBUF_UNLOCK(&so->so_snd); 13032 return (EHOSTUNREACH); 13033 } 13034 hdrlen += sizeof(struct udphdr); 13035 } 13036 #ifdef INET6 13037 if (isipv6) 13038 ipoptlen = ip6_optlen(tp->t_inpcb); 13039 else 13040 #endif 13041 if (tp->t_inpcb->inp_options) 13042 ipoptlen = tp->t_inpcb->inp_options->m_len - 13043 offsetof(struct ipoption, ipopt_list); 13044 else 13045 ipoptlen = 0; 13046 ipoptlen = 0; 13047 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 13048 ipoptlen += ipsec_optlen; 13049 #endif 13050 if (bbr->rc_last_options != local_options) { 13051 /* 13052 * Cache the options length this generally does not change 13053 * on a connection. We use this to calculate TSO. 13054 */ 13055 bbr->rc_last_options = local_options; 13056 } 13057 maxseg = tp->t_maxseg - (ipoptlen + optlen); 13058 p_maxseg = min(maxseg, pace_max_segs); 13059 /* 13060 * Adjust data length if insertion of options will bump the packet 13061 * length beyond the t_maxseg length. Clear the FIN bit because we 13062 * cut off the tail of the segment. 13063 */ 13064 if (len > maxseg) { 13065 if (len != 0 && (flags & TH_FIN)) { 13066 flags &= ~TH_FIN; 13067 } 13068 if (tso) { 13069 uint32_t moff; 13070 int32_t max_len; 13071 13072 /* extract TSO information */ 13073 if_hw_tsomax = tp->t_tsomax; 13074 if_hw_tsomaxsegcount = tp->t_tsomaxsegcount; 13075 if_hw_tsomaxsegsize = tp->t_tsomaxsegsize; 13076 KASSERT(ipoptlen == 0, 13077 ("%s: TSO can't do IP options", __func__)); 13078 13079 /* 13080 * Check if we should limit by maximum payload 13081 * length: 13082 */ 13083 if (if_hw_tsomax != 0) { 13084 /* compute maximum TSO length */ 13085 max_len = (if_hw_tsomax - hdrlen - 13086 max_linkhdr); 13087 if (max_len <= 0) { 13088 len = 0; 13089 } else if (len > max_len) { 13090 len = max_len; 13091 } 13092 } 13093 /* 13094 * Prevent the last segment from being fractional 13095 * unless the send sockbuf can be emptied: 13096 */ 13097 if ((sb_offset + len) < sbavail(sb)) { 13098 moff = len % (uint32_t)maxseg; 13099 if (moff != 0) { 13100 len -= moff; 13101 } 13102 } 13103 /* 13104 * In case there are too many small fragments don't 13105 * use TSO: 13106 */ 13107 if (len <= maxseg) { 13108 len = maxseg; 13109 tso = 0; 13110 } 13111 } else { 13112 /* Not doing TSO */ 13113 if (optlen + ipoptlen >= tp->t_maxseg) { 13114 /* 13115 * Since we don't have enough space to put 13116 * the IP header chain and the TCP header in 13117 * one packet as required by RFC 7112, don't 13118 * send it. Also ensure that at least one 13119 * byte of the payload can be put into the 13120 * TCP segment. 13121 */ 13122 SOCKBUF_UNLOCK(&so->so_snd); 13123 error = EMSGSIZE; 13124 sack_rxmit = 0; 13125 goto out; 13126 } 13127 len = maxseg; 13128 } 13129 } else { 13130 /* Not doing TSO */ 13131 if_hw_tsomaxsegcount = 0; 13132 tso = 0; 13133 } 13134 KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET, 13135 ("%s: len > IP_MAXPACKET", __func__)); 13136 #ifdef DIAGNOSTIC 13137 #ifdef INET6 13138 if (max_linkhdr + hdrlen > MCLBYTES) 13139 #else 13140 if (max_linkhdr + hdrlen > MHLEN) 13141 #endif 13142 panic("tcphdr too big"); 13143 #endif 13144 /* 13145 * This KASSERT is here to catch edge cases at a well defined place. 13146 * Before, those had triggered (random) panic conditions further 13147 * down. 13148 */ 13149 #ifdef BBR_INVARIANTS 13150 if (sack_rxmit) { 13151 if (SEQ_LT(rsm->r_start, tp->snd_una)) { 13152 panic("RSM:%p TP:%p bbr:%p start:%u is < snd_una:%u", 13153 rsm, tp, bbr, rsm->r_start, tp->snd_una); 13154 } 13155 } 13156 #endif 13157 KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); 13158 if ((len == 0) && 13159 (flags & TH_FIN) && 13160 (sbused(sb))) { 13161 /* 13162 * We have outstanding data, don't send a fin by itself!. 13163 */ 13164 slot = 0; 13165 goto just_return; 13166 } 13167 /* 13168 * Grab a header mbuf, attaching a copy of data to be transmitted, 13169 * and initialize the header from the template for sends on this 13170 * connection. 13171 */ 13172 if (len) { 13173 uint32_t moff; 13174 uint32_t orig_len; 13175 13176 /* 13177 * We place a limit on sending with hptsi. 13178 */ 13179 if ((rsm == NULL) && len > pace_max_segs) 13180 len = pace_max_segs; 13181 if (len <= maxseg) 13182 tso = 0; 13183 #ifdef INET6 13184 if (MHLEN < hdrlen + max_linkhdr) 13185 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 13186 else 13187 #endif 13188 m = m_gethdr(M_NOWAIT, MT_DATA); 13189 13190 if (m == NULL) { 13191 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13192 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13193 SOCKBUF_UNLOCK(sb); 13194 error = ENOBUFS; 13195 sack_rxmit = 0; 13196 goto out; 13197 } 13198 m->m_data += max_linkhdr; 13199 m->m_len = hdrlen; 13200 /* 13201 * Start the m_copy functions from the closest mbuf to the 13202 * sb_offset in the socket buffer chain. 13203 */ 13204 if ((sb_offset > sbavail(sb)) || ((len + sb_offset) > sbavail(sb))) { 13205 #ifdef BBR_INVARIANTS 13206 if ((len + sb_offset) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) 13207 panic("tp:%p bbr:%p len:%u sb_offset:%u sbavail:%u rsm:%p %u:%u:%u", 13208 tp, bbr, len, sb_offset, sbavail(sb), rsm, 13209 doing_retran_from, 13210 picked_up_retran, 13211 doing_tlp); 13212 13213 #endif 13214 /* 13215 * In this messed up situation we have two choices, 13216 * a) pretend the send worked, and just start timers 13217 * and what not (not good since that may lead us 13218 * back here a lot). <or> b) Send the lowest segment 13219 * in the map. <or> c) Drop the connection. Lets do 13220 * <b> which if it continues to happen will lead to 13221 * <c> via timeouts. 13222 */ 13223 BBR_STAT_INC(bbr_offset_recovery); 13224 rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); 13225 sb_offset = 0; 13226 if (rsm == NULL) { 13227 sack_rxmit = 0; 13228 len = sbavail(sb); 13229 } else { 13230 sack_rxmit = 1; 13231 if (rsm->r_start != tp->snd_una) { 13232 /* 13233 * Things are really messed up, <c> 13234 * is the only thing to do. 13235 */ 13236 BBR_STAT_INC(bbr_offset_drop); 13237 tcp_set_inp_to_drop(inp, EFAULT); 13238 SOCKBUF_UNLOCK(sb); 13239 (void)m_free(m); 13240 return (0); 13241 } 13242 len = rsm->r_end - rsm->r_start; 13243 } 13244 if (len > sbavail(sb)) 13245 len = sbavail(sb); 13246 if (len > maxseg) 13247 len = maxseg; 13248 } 13249 mb = sbsndptr_noadv(sb, sb_offset, &moff); 13250 if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) { 13251 m_copydata(mb, moff, (int)len, 13252 mtod(m, caddr_t)+hdrlen); 13253 if (rsm == NULL) 13254 sbsndptr_adv(sb, mb, len); 13255 m->m_len += len; 13256 } else { 13257 struct sockbuf *msb; 13258 13259 if (rsm) 13260 msb = NULL; 13261 else 13262 msb = sb; 13263 #ifdef BBR_INVARIANTS 13264 if ((len + moff) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) { 13265 if (rsm) { 13266 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 ", 13267 tp, bbr, len, moff, 13268 sbavail(sb), rsm, 13269 tp->snd_una, rsm->r_flags, rsm->r_start, 13270 doing_retran_from, 13271 picked_up_retran, 13272 doing_tlp, sack_rxmit); 13273 } else { 13274 panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u sb_offset:%u snd_una:%u", 13275 tp, bbr, len, moff, sbavail(sb), sb_offset, tp->snd_una); 13276 } 13277 } 13278 #endif 13279 orig_len = len; 13280 m->m_next = tcp_m_copym( 13281 mb, moff, &len, 13282 if_hw_tsomaxsegcount, 13283 if_hw_tsomaxsegsize, msb, 13284 ((rsm == NULL) ? hw_tls : 0) 13285 #ifdef NETFLIX_COPY_ARGS 13286 , &filled_all 13287 #endif 13288 ); 13289 if (len <= maxseg) { 13290 /* 13291 * Must have ran out of mbufs for the copy 13292 * shorten it to no longer need tso. Lets 13293 * not put on sendalot since we are low on 13294 * mbufs. 13295 */ 13296 tso = 0; 13297 } 13298 if (m->m_next == NULL) { 13299 SOCKBUF_UNLOCK(sb); 13300 (void)m_free(m); 13301 error = ENOBUFS; 13302 sack_rxmit = 0; 13303 goto out; 13304 } 13305 } 13306 #ifdef BBR_INVARIANTS 13307 if (tso && len < maxseg) { 13308 panic("tp:%p tso on, but len:%d < maxseg:%d", 13309 tp, len, maxseg); 13310 } 13311 if (tso && if_hw_tsomaxsegcount) { 13312 int32_t seg_cnt = 0; 13313 struct mbuf *foo; 13314 13315 foo = m; 13316 while (foo) { 13317 seg_cnt++; 13318 foo = foo->m_next; 13319 } 13320 if (seg_cnt > if_hw_tsomaxsegcount) { 13321 panic("seg_cnt:%d > max:%d", seg_cnt, if_hw_tsomaxsegcount); 13322 } 13323 } 13324 #endif 13325 /* 13326 * If we're sending everything we've got, set PUSH. (This 13327 * will keep happy those implementations which only give 13328 * data to the user when a buffer fills or a PUSH comes in.) 13329 */ 13330 if (sb_offset + len == sbused(sb) && 13331 sbused(sb) && 13332 !(flags & TH_SYN)) { 13333 flags |= TH_PUSH; 13334 } 13335 SOCKBUF_UNLOCK(sb); 13336 } else { 13337 SOCKBUF_UNLOCK(sb); 13338 if (tp->t_flags & TF_ACKNOW) 13339 KMOD_TCPSTAT_INC(tcps_sndacks); 13340 else if (flags & (TH_SYN | TH_FIN | TH_RST)) 13341 KMOD_TCPSTAT_INC(tcps_sndctrl); 13342 else 13343 KMOD_TCPSTAT_INC(tcps_sndwinup); 13344 13345 m = m_gethdr(M_NOWAIT, MT_DATA); 13346 if (m == NULL) { 13347 BBR_STAT_INC(bbr_failed_mbuf_aloc); 13348 bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); 13349 error = ENOBUFS; 13350 /* Fudge the send time since we could not send */ 13351 sack_rxmit = 0; 13352 goto out; 13353 } 13354 #ifdef INET6 13355 if (isipv6 && (MHLEN < hdrlen + max_linkhdr) && 13356 MHLEN >= hdrlen) { 13357 M_ALIGN(m, hdrlen); 13358 } else 13359 #endif 13360 m->m_data += max_linkhdr; 13361 m->m_len = hdrlen; 13362 } 13363 SOCKBUF_UNLOCK_ASSERT(sb); 13364 m->m_pkthdr.rcvif = (struct ifnet *)0; 13365 #ifdef MAC 13366 mac_inpcb_create_mbuf(inp, m); 13367 #endif 13368 #ifdef INET6 13369 if (isipv6) { 13370 ip6 = mtod(m, struct ip6_hdr *); 13371 if (tp->t_port) { 13372 udp = (struct udphdr *)((caddr_t)ip6 + sizeof(struct ip6_hdr)); 13373 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13374 udp->uh_dport = tp->t_port; 13375 ulen = hdrlen + len - sizeof(struct ip6_hdr); 13376 udp->uh_ulen = htons(ulen); 13377 th = (struct tcphdr *)(udp + 1); 13378 } else { 13379 th = (struct tcphdr *)(ip6 + 1); 13380 } 13381 tcpip_fillheaders(inp, tp->t_port, ip6, th); 13382 } else 13383 #endif /* INET6 */ 13384 { 13385 ip = mtod(m, struct ip *); 13386 #ifdef TCPDEBUG 13387 ipov = (struct ipovly *)ip; 13388 #endif 13389 if (tp->t_port) { 13390 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip)); 13391 udp->uh_sport = htons(V_tcp_udp_tunneling_port); 13392 udp->uh_dport = tp->t_port; 13393 ulen = hdrlen + len - sizeof(struct ip); 13394 udp->uh_ulen = htons(ulen); 13395 th = (struct tcphdr *)(udp + 1); 13396 } else { 13397 th = (struct tcphdr *)(ip + 1); 13398 } 13399 tcpip_fillheaders(inp, tp->t_port, ip, th); 13400 } 13401 /* 13402 * If we are doing retransmissions, then snd_nxt will not reflect 13403 * the first unsent octet. For ACK only packets, we do not want the 13404 * sequence number of the retransmitted packet, we want the sequence 13405 * number of the next unsent octet. So, if there is no data (and no 13406 * SYN or FIN), use snd_max instead of snd_nxt when filling in 13407 * ti_seq. But if we are in persist state, snd_max might reflect 13408 * one byte beyond the right edge of the window, so use snd_nxt in 13409 * that case, since we know we aren't doing a retransmission. 13410 * (retransmit and persist are mutually exclusive...) 13411 */ 13412 if (sack_rxmit == 0) { 13413 if (len && ((flags & (TH_FIN | TH_SYN | TH_RST)) == 0)) { 13414 /* New data (including new persists) */ 13415 th->th_seq = htonl(tp->snd_max); 13416 bbr_seq = tp->snd_max; 13417 } else if (flags & TH_SYN) { 13418 /* Syn's always send from iss */ 13419 th->th_seq = htonl(tp->iss); 13420 bbr_seq = tp->iss; 13421 } else if (flags & TH_FIN) { 13422 if (flags & TH_FIN && tp->t_flags & TF_SENTFIN) { 13423 /* 13424 * If we sent the fin already its 1 minus 13425 * snd_max 13426 */ 13427 th->th_seq = (htonl(tp->snd_max - 1)); 13428 bbr_seq = (tp->snd_max - 1); 13429 } else { 13430 /* First time FIN use snd_max */ 13431 th->th_seq = htonl(tp->snd_max); 13432 bbr_seq = tp->snd_max; 13433 } 13434 } else { 13435 /* 13436 * len == 0 and not persist we use snd_max, sending 13437 * an ack unless we have sent the fin then its 1 13438 * minus. 13439 */ 13440 /* 13441 * XXXRRS Question if we are in persists and we have 13442 * nothing outstanding to send and we have not sent 13443 * a FIN, we will send an ACK. In such a case it 13444 * might be better to send (tp->snd_una - 1) which 13445 * would force the peer to ack. 13446 */ 13447 if (tp->t_flags & TF_SENTFIN) { 13448 th->th_seq = htonl(tp->snd_max - 1); 13449 bbr_seq = (tp->snd_max - 1); 13450 } else { 13451 th->th_seq = htonl(tp->snd_max); 13452 bbr_seq = tp->snd_max; 13453 } 13454 } 13455 } else { 13456 /* All retransmits use the rsm to guide the send */ 13457 th->th_seq = htonl(rsm->r_start); 13458 bbr_seq = rsm->r_start; 13459 } 13460 th->th_ack = htonl(tp->rcv_nxt); 13461 if (optlen) { 13462 bcopy(opt, th + 1, optlen); 13463 th->th_off = (sizeof(struct tcphdr) + optlen) >> 2; 13464 } 13465 th->th_flags = flags; 13466 /* 13467 * Calculate receive window. Don't shrink window, but avoid silly 13468 * window syndrome. 13469 */ 13470 if ((flags & TH_RST) || ((recwin < (so->so_rcv.sb_hiwat / 4) && 13471 recwin < maxseg))) 13472 recwin = 0; 13473 if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && 13474 recwin < (tp->rcv_adv - tp->rcv_nxt)) 13475 recwin = (tp->rcv_adv - tp->rcv_nxt); 13476 if (recwin > TCP_MAXWIN << tp->rcv_scale) 13477 recwin = TCP_MAXWIN << tp->rcv_scale; 13478 13479 /* 13480 * According to RFC1323 the window field in a SYN (i.e., a <SYN> or 13481 * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is 13482 * handled in syncache. 13483 */ 13484 if (flags & TH_SYN) 13485 th->th_win = htons((u_short) 13486 (min(sbspace(&so->so_rcv), TCP_MAXWIN))); 13487 else { 13488 /* Avoid shrinking window with window scaling. */ 13489 recwin = roundup2(recwin, 1 << tp->rcv_scale); 13490 th->th_win = htons((u_short)(recwin >> tp->rcv_scale)); 13491 } 13492 /* 13493 * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0 13494 * window. This may cause the remote transmitter to stall. This 13495 * flag tells soreceive() to disable delayed acknowledgements when 13496 * draining the buffer. This can occur if the receiver is 13497 * attempting to read more data than can be buffered prior to 13498 * transmitting on the connection. 13499 */ 13500 if (th->th_win == 0) { 13501 tp->t_sndzerowin++; 13502 tp->t_flags |= TF_RXWIN0SENT; 13503 } else 13504 tp->t_flags &= ~TF_RXWIN0SENT; 13505 /* 13506 * We don't support urgent data, but drag along 13507 * the pointer in case of a stack switch. 13508 */ 13509 tp->snd_up = tp->snd_una; 13510 13511 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 13512 if (to.to_flags & TOF_SIGNATURE) { 13513 /* 13514 * Calculate MD5 signature and put it into the place 13515 * determined before. NOTE: since TCP options buffer doesn't 13516 * point into mbuf's data, calculate offset and use it. 13517 */ 13518 if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th, 13519 (u_char *)(th + 1) + (to.to_signature - opt)) != 0) { 13520 /* 13521 * Do not send segment if the calculation of MD5 13522 * digest has failed. 13523 */ 13524 goto out; 13525 } 13526 } 13527 #endif 13528 13529 /* 13530 * Put TCP length in extended header, and then checksum extended 13531 * header and data. 13532 */ 13533 m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */ 13534 #ifdef INET6 13535 if (isipv6) { 13536 /* 13537 * ip6_plen is not need to be filled now, and will be filled 13538 * in ip6_output. 13539 */ 13540 if (tp->t_port) { 13541 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 13542 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13543 udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0); 13544 th->th_sum = htons(0); 13545 UDPSTAT_INC(udps_opackets); 13546 } else { 13547 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; 13548 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13549 th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) + 13550 optlen + len, IPPROTO_TCP, 0); 13551 } 13552 } 13553 #endif 13554 #if defined(INET6) && defined(INET) 13555 else 13556 #endif 13557 #ifdef INET 13558 { 13559 if (tp->t_port) { 13560 m->m_pkthdr.csum_flags = CSUM_UDP; 13561 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 13562 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, 13563 ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP)); 13564 th->th_sum = htons(0); 13565 UDPSTAT_INC(udps_opackets); 13566 } else { 13567 csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP; 13568 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 13569 th->th_sum = in_pseudo(ip->ip_src.s_addr, 13570 ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) + 13571 IPPROTO_TCP + len + optlen)); 13572 } 13573 /* IP version must be set here for ipv4/ipv6 checking later */ 13574 KASSERT(ip->ip_v == IPVERSION, 13575 ("%s: IP version incorrect: %d", __func__, ip->ip_v)); 13576 } 13577 #endif 13578 13579 /* 13580 * Enable TSO and specify the size of the segments. The TCP pseudo 13581 * header checksum is always provided. XXX: Fixme: This is currently 13582 * not the case for IPv6. 13583 */ 13584 if (tso) { 13585 KASSERT(len > maxseg, 13586 ("%s: len:%d <= tso_segsz:%d", __func__, len, maxseg)); 13587 m->m_pkthdr.csum_flags |= CSUM_TSO; 13588 csum_flags |= CSUM_TSO; 13589 m->m_pkthdr.tso_segsz = maxseg; 13590 } 13591 KASSERT(len + hdrlen == m_length(m, NULL), 13592 ("%s: mbuf chain different than expected: %d + %u != %u", 13593 __func__, len, hdrlen, m_length(m, NULL))); 13594 13595 #ifdef TCP_HHOOK 13596 /* Run HHOOK_TC_ESTABLISHED_OUT helper hooks. */ 13597 hhook_run_tcp_est_out(tp, th, &to, len, tso); 13598 #endif 13599 #ifdef TCPDEBUG 13600 /* 13601 * Trace. 13602 */ 13603 if (so->so_options & SO_DEBUG) { 13604 u_short save = 0; 13605 13606 #ifdef INET6 13607 if (!isipv6) 13608 #endif 13609 { 13610 save = ipov->ih_len; 13611 ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen + 13612 * (th->th_off << 2) */ ); 13613 } 13614 tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0); 13615 #ifdef INET6 13616 if (!isipv6) 13617 #endif 13618 ipov->ih_len = save; 13619 } 13620 #endif /* TCPDEBUG */ 13621 13622 /* Log to the black box */ 13623 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 13624 union tcp_log_stackspecific log; 13625 13626 bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); 13627 /* Record info on type of transmission */ 13628 log.u_bbr.flex1 = bbr->r_ctl.rc_hptsi_agg_delay; 13629 log.u_bbr.flex2 = (bbr->r_recovery_bw << 3); 13630 log.u_bbr.flex3 = maxseg; 13631 log.u_bbr.flex4 = delay_calc; 13632 /* Encode filled_all into the upper flex5 bit */ 13633 log.u_bbr.flex5 = bbr->rc_past_init_win; 13634 log.u_bbr.flex5 <<= 1; 13635 log.u_bbr.flex5 |= bbr->rc_no_pacing; 13636 log.u_bbr.flex5 <<= 29; 13637 if (filled_all) 13638 log.u_bbr.flex5 |= 0x80000000; 13639 log.u_bbr.flex5 |= tp->t_maxseg; 13640 log.u_bbr.flex6 = bbr->r_ctl.rc_pace_max_segs; 13641 log.u_bbr.flex7 = (bbr->rc_bbr_state << 8) | bbr_state_val(bbr); 13642 /* lets poke in the low and the high here for debugging */ 13643 log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; 13644 if (rsm || sack_rxmit) { 13645 if (doing_tlp) 13646 log.u_bbr.flex8 = 2; 13647 else 13648 log.u_bbr.flex8 = 1; 13649 } else { 13650 log.u_bbr.flex8 = 0; 13651 } 13652 lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK, 13653 len, &log, false, NULL, NULL, 0, tv); 13654 } else { 13655 lgb = NULL; 13656 } 13657 /* 13658 * Fill in IP length and desired time to live and send to IP level. 13659 * There should be a better way to handle ttl and tos; we could keep 13660 * them in the template, but need a way to checksum without them. 13661 */ 13662 /* 13663 * m->m_pkthdr.len should have been set before cksum calcuration, 13664 * because in6_cksum() need it. 13665 */ 13666 #ifdef INET6 13667 if (isipv6) { 13668 /* 13669 * we separately set hoplimit for every segment, since the 13670 * user might want to change the value via setsockopt. Also, 13671 * desired default hop limit might be changed via Neighbor 13672 * Discovery. 13673 */ 13674 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 13675 13676 /* 13677 * Set the packet size here for the benefit of DTrace 13678 * probes. ip6_output() will set it properly; it's supposed 13679 * to include the option header lengths as well. 13680 */ 13681 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 13682 13683 if (V_path_mtu_discovery && maxseg > V_tcp_minmss) 13684 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13685 else 13686 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 13687 13688 if (tp->t_state == TCPS_SYN_SENT) 13689 TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th); 13690 13691 TCP_PROBE5(send, NULL, tp, ip6, tp, th); 13692 /* TODO: IPv6 IP6TOS_ECT bit on */ 13693 error = ip6_output(m, inp->in6p_outputopts, 13694 &inp->inp_route6, 13695 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 13696 NULL, NULL, inp); 13697 13698 if (error == EMSGSIZE && inp->inp_route6.ro_nh != NULL) 13699 mtu = inp->inp_route6.ro_nh->nh_mtu; 13700 } 13701 #endif /* INET6 */ 13702 #if defined(INET) && defined(INET6) 13703 else 13704 #endif 13705 #ifdef INET 13706 { 13707 ip->ip_len = htons(m->m_pkthdr.len); 13708 #ifdef INET6 13709 if (isipv6) 13710 ip->ip_ttl = in6_selecthlim(inp, NULL); 13711 #endif /* INET6 */ 13712 /* 13713 * If we do path MTU discovery, then we set DF on every 13714 * packet. This might not be the best thing to do according 13715 * to RFC3390 Section 2. However the tcp hostcache migitates 13716 * the problem so it affects only the first tcp connection 13717 * with a host. 13718 * 13719 * NB: Don't set DF on small MTU/MSS to have a safe 13720 * fallback. 13721 */ 13722 if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) { 13723 tp->t_flags2 |= TF2_PLPMTU_PMTUD; 13724 if (tp->t_port == 0 || len < V_tcp_minmss) { 13725 ip->ip_off |= htons(IP_DF); 13726 } 13727 } else { 13728 tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; 13729 } 13730 13731 if (tp->t_state == TCPS_SYN_SENT) 13732 TCP_PROBE5(connect__request, NULL, tp, ip, tp, th); 13733 13734 TCP_PROBE5(send, NULL, tp, ip, tp, th); 13735 13736 error = ip_output(m, inp->inp_options, &inp->inp_route, 13737 ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0, 13738 inp); 13739 if (error == EMSGSIZE && inp->inp_route.ro_nh != NULL) 13740 mtu = inp->inp_route.ro_nh->nh_mtu; 13741 } 13742 #endif /* INET */ 13743 out: 13744 13745 if (lgb) { 13746 lgb->tlb_errno = error; 13747 lgb = NULL; 13748 } 13749 /* 13750 * In transmit state, time the transmission and arrange for the 13751 * retransmit. In persist state, just set snd_max. 13752 */ 13753 if (error == 0) { 13754 tcp_account_for_send(tp, len, (rsm != NULL), doing_tlp, hw_tls); 13755 if (TCPS_HAVEESTABLISHED(tp->t_state) && 13756 (tp->t_flags & TF_SACK_PERMIT) && 13757 tp->rcv_numsacks > 0) 13758 tcp_clean_dsack_blocks(tp); 13759 /* We sent an ack clear the bbr_segs_rcvd count */ 13760 bbr->output_error_seen = 0; 13761 bbr->oerror_cnt = 0; 13762 bbr->bbr_segs_rcvd = 0; 13763 if (len == 0) 13764 counter_u64_add(bbr_out_size[TCP_MSS_ACCT_SNDACK], 1); 13765 /* Do accounting for new sends */ 13766 if ((len > 0) && (rsm == NULL)) { 13767 int idx; 13768 if (tp->snd_una == tp->snd_max) { 13769 /* 13770 * Special case to match google, when 13771 * nothing is in flight the delivered 13772 * time does get updated to the current 13773 * time (see tcp_rate_bsd.c). 13774 */ 13775 bbr->r_ctl.rc_del_time = cts; 13776 } 13777 if (len >= maxseg) { 13778 idx = (len / maxseg) + 3; 13779 if (idx >= TCP_MSS_ACCT_ATIMER) 13780 counter_u64_add(bbr_out_size[(TCP_MSS_ACCT_ATIMER - 1)], 1); 13781 else 13782 counter_u64_add(bbr_out_size[idx], 1); 13783 } else { 13784 /* smaller than a MSS */ 13785 idx = len / (bbr_hptsi_bytes_min - bbr->rc_last_options); 13786 if (idx >= TCP_MSS_SMALL_MAX_SIZE_DIV) 13787 idx = (TCP_MSS_SMALL_MAX_SIZE_DIV - 1); 13788 counter_u64_add(bbr_out_size[(idx + TCP_MSS_SMALL_SIZE_OFF)], 1); 13789 } 13790 } 13791 } 13792 abandon = 0; 13793 /* 13794 * We must do the send accounting before we log the output, 13795 * otherwise the state of the rsm could change and we account to the 13796 * wrong bucket. 13797 */ 13798 if (len > 0) { 13799 bbr_do_send_accounting(tp, bbr, rsm, len, error); 13800 if (error == 0) { 13801 if (tp->snd_una == tp->snd_max) 13802 bbr->r_ctl.rc_tlp_rxt_last_time = cts; 13803 } 13804 } 13805 bbr_log_output(bbr, tp, &to, len, bbr_seq, (uint8_t) flags, error, 13806 cts, mb, &abandon, rsm, 0, sb); 13807 if (abandon) { 13808 /* 13809 * If bbr_log_output destroys the TCB or sees a TH_RST being 13810 * sent we should hit this condition. 13811 */ 13812 return (0); 13813 } 13814 if (bbr->rc_in_persist == 0) { 13815 /* 13816 * Advance snd_nxt over sequence space of this segment. 13817 */ 13818 if (error) 13819 /* We don't log or do anything with errors */ 13820 goto skip_upd; 13821 13822 if (tp->snd_una == tp->snd_max && 13823 (len || (flags & (TH_SYN | TH_FIN)))) { 13824 /* 13825 * Update the time we just added data since none was 13826 * outstanding. 13827 */ 13828 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 13829 bbr->rc_tp->t_acktime = ticks; 13830 } 13831 if (flags & (TH_SYN | TH_FIN) && (rsm == NULL)) { 13832 if (flags & TH_SYN) { 13833 /* 13834 * Smack the snd_max to iss + 1 13835 * if its a FO we will add len below. 13836 */ 13837 tp->snd_max = tp->iss + 1; 13838 } 13839 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 13840 tp->snd_max++; 13841 tp->t_flags |= TF_SENTFIN; 13842 } 13843 } 13844 if (sack_rxmit == 0) 13845 tp->snd_max += len; 13846 skip_upd: 13847 if ((error == 0) && len) 13848 tot_len += len; 13849 } else { 13850 /* Persists case */ 13851 int32_t xlen = len; 13852 13853 if (error) 13854 goto nomore; 13855 13856 if (flags & TH_SYN) 13857 ++xlen; 13858 if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { 13859 ++xlen; 13860 tp->t_flags |= TF_SENTFIN; 13861 } 13862 if (xlen && (tp->snd_una == tp->snd_max)) { 13863 /* 13864 * Update the time we just added data since none was 13865 * outstanding. 13866 */ 13867 bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); 13868 bbr->rc_tp->t_acktime = ticks; 13869 } 13870 if (sack_rxmit == 0) 13871 tp->snd_max += xlen; 13872 tot_len += (len + optlen + ipoptlen); 13873 } 13874 nomore: 13875 if (error) { 13876 /* 13877 * Failures do not advance the seq counter above. For the 13878 * case of ENOBUFS we will fall out and become ack-clocked. 13879 * capping the cwnd at the current flight. 13880 * Everything else will just have to retransmit with the timer 13881 * (no pacer). 13882 */ 13883 SOCKBUF_UNLOCK_ASSERT(sb); 13884 BBR_STAT_INC(bbr_saw_oerr); 13885 /* Clear all delay/early tracks */ 13886 bbr->r_ctl.rc_hptsi_agg_delay = 0; 13887 bbr->r_ctl.rc_agg_early = 0; 13888 bbr->r_agg_early_set = 0; 13889 bbr->output_error_seen = 1; 13890 if (bbr->oerror_cnt < 0xf) 13891 bbr->oerror_cnt++; 13892 if (bbr_max_net_error_cnt && (bbr->oerror_cnt >= bbr_max_net_error_cnt)) { 13893 /* drop the session */ 13894 tcp_set_inp_to_drop(inp, ENETDOWN); 13895 } 13896 switch (error) { 13897 case ENOBUFS: 13898 /* 13899 * Make this guy have to get ack's to send 13900 * more but lets make sure we don't 13901 * slam him below a T-O (1MSS). 13902 */ 13903 if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { 13904 tp->snd_cwnd = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 13905 bbr->r_ctl.rc_lost_bytes)) - maxseg; 13906 if (tp->snd_cwnd < maxseg) 13907 tp->snd_cwnd = maxseg; 13908 } 13909 slot = (bbr_error_base_paceout + 1) << bbr->oerror_cnt; 13910 BBR_STAT_INC(bbr_saw_enobuf); 13911 if (bbr->bbr_hdrw_pacing) 13912 counter_u64_add(bbr_hdwr_pacing_enobuf, 1); 13913 else 13914 counter_u64_add(bbr_nohdwr_pacing_enobuf, 1); 13915 /* 13916 * Here even in the enobuf's case we want to do our 13917 * state update. The reason being we may have been 13918 * called by the input function. If so we have had 13919 * things change. 13920 */ 13921 error = 0; 13922 goto enobufs; 13923 case EMSGSIZE: 13924 /* 13925 * For some reason the interface we used initially 13926 * to send segments changed to another or lowered 13927 * its MTU. If TSO was active we either got an 13928 * interface without TSO capabilits or TSO was 13929 * turned off. If we obtained mtu from ip_output() 13930 * then update it and try again. 13931 */ 13932 /* Turn on tracing (or try to) */ 13933 { 13934 int old_maxseg; 13935 13936 old_maxseg = tp->t_maxseg; 13937 BBR_STAT_INC(bbr_saw_emsgsiz); 13938 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, csum_flags, tso, cts); 13939 if (mtu != 0) 13940 tcp_mss_update(tp, -1, mtu, NULL, NULL); 13941 if (old_maxseg <= tp->t_maxseg) { 13942 /* Huh it did not shrink? */ 13943 tp->t_maxseg = old_maxseg - 40; 13944 bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, 0, tso, cts); 13945 } 13946 /* 13947 * Nuke all other things that can interfere 13948 * with slot 13949 */ 13950 if ((tot_len + len) && (len >= tp->t_maxseg)) { 13951 slot = bbr_get_pacing_delay(bbr, 13952 bbr->r_ctl.rc_bbr_hptsi_gain, 13953 (tot_len + len), cts, 0); 13954 if (slot < bbr_error_base_paceout) 13955 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 13956 } else 13957 slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; 13958 bbr->rc_output_starts_timer = 1; 13959 bbr_start_hpts_timer(bbr, tp, cts, 10, slot, 13960 tot_len); 13961 return (error); 13962 } 13963 case EPERM: 13964 tp->t_softerror = error; 13965 /* Fall through */ 13966 case EHOSTDOWN: 13967 case EHOSTUNREACH: 13968 case ENETDOWN: 13969 case ENETUNREACH: 13970 if (TCPS_HAVERCVDSYN(tp->t_state)) { 13971 tp->t_softerror = error; 13972 } 13973 /* FALLTHROUGH */ 13974 default: 13975 slot = (bbr_error_base_paceout + 3) << bbr->oerror_cnt; 13976 bbr->rc_output_starts_timer = 1; 13977 bbr_start_hpts_timer(bbr, tp, cts, 11, slot, 0); 13978 return (error); 13979 } 13980 #ifdef STATS 13981 } else if (((tp->t_flags & TF_GPUTINPROG) == 0) && 13982 len && 13983 (rsm == NULL) && 13984 (bbr->rc_in_persist == 0)) { 13985 tp->gput_seq = bbr_seq; 13986 tp->gput_ack = bbr_seq + 13987 min(sbavail(&so->so_snd) - sb_offset, sendwin); 13988 tp->gput_ts = cts; 13989 tp->t_flags |= TF_GPUTINPROG; 13990 #endif 13991 } 13992 KMOD_TCPSTAT_INC(tcps_sndtotal); 13993 if ((bbr->bbr_hdw_pace_ena) && 13994 (bbr->bbr_attempt_hdwr_pace == 0) && 13995 (bbr->rc_past_init_win) && 13996 (bbr->rc_bbr_state != BBR_STATE_STARTUP) && 13997 (get_filter_value(&bbr->r_ctl.rc_delrate)) && 13998 (inp->inp_route.ro_nh && 13999 inp->inp_route.ro_nh->nh_ifp)) { 14000 /* 14001 * We are past the initial window and 14002 * have at least one measurement so we 14003 * could use hardware pacing if its available. 14004 * We have an interface and we have not attempted 14005 * to setup hardware pacing, lets try to now. 14006 */ 14007 uint64_t rate_wanted; 14008 int err = 0; 14009 14010 rate_wanted = bbr_get_hardware_rate(bbr); 14011 bbr->bbr_attempt_hdwr_pace = 1; 14012 bbr->r_ctl.crte = tcp_set_pacing_rate(bbr->rc_tp, 14013 inp->inp_route.ro_nh->nh_ifp, 14014 rate_wanted, 14015 (RS_PACING_GEQ|RS_PACING_SUB_OK), 14016 &err, NULL); 14017 if (bbr->r_ctl.crte) { 14018 bbr_type_log_hdwr_pacing(bbr, 14019 bbr->r_ctl.crte->ptbl->rs_ifp, 14020 rate_wanted, 14021 bbr->r_ctl.crte->rate, 14022 __LINE__, cts, err); 14023 BBR_STAT_INC(bbr_hdwr_rl_add_ok); 14024 counter_u64_add(bbr_flows_nohdwr_pacing, -1); 14025 counter_u64_add(bbr_flows_whdwr_pacing, 1); 14026 bbr->bbr_hdrw_pacing = 1; 14027 /* Now what is our gain status? */ 14028 if (bbr->r_ctl.crte->rate < rate_wanted) { 14029 /* We have a problem */ 14030 bbr_setup_less_of_rate(bbr, cts, 14031 bbr->r_ctl.crte->rate, rate_wanted); 14032 } else { 14033 /* We are good */ 14034 bbr->gain_is_limited = 0; 14035 bbr->skip_gain = 0; 14036 } 14037 tcp_bbr_tso_size_check(bbr, cts); 14038 } else { 14039 bbr_type_log_hdwr_pacing(bbr, 14040 inp->inp_route.ro_nh->nh_ifp, 14041 rate_wanted, 14042 0, 14043 __LINE__, cts, err); 14044 BBR_STAT_INC(bbr_hdwr_rl_add_fail); 14045 } 14046 } 14047 if (bbr->bbr_hdrw_pacing) { 14048 /* 14049 * Worry about cases where the route 14050 * changes or something happened that we 14051 * lost our hardware pacing possibly during 14052 * the last ip_output call. 14053 */ 14054 if (inp->inp_snd_tag == NULL) { 14055 /* A change during ip output disabled hw pacing? */ 14056 bbr->bbr_hdrw_pacing = 0; 14057 } else if ((inp->inp_route.ro_nh == NULL) || 14058 (inp->inp_route.ro_nh->nh_ifp != inp->inp_snd_tag->ifp)) { 14059 /* 14060 * We had an interface or route change, 14061 * detach from the current hdwr pacing 14062 * and setup to re-attempt next go 14063 * round. 14064 */ 14065 bbr->bbr_hdrw_pacing = 0; 14066 bbr->bbr_attempt_hdwr_pace = 0; 14067 tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); 14068 tcp_bbr_tso_size_check(bbr, cts); 14069 } 14070 } 14071 /* 14072 * Data sent (as far as we can tell). If this advertises a larger 14073 * window than any other segment, then remember the size of the 14074 * advertised window. Any pending ACK has now been sent. 14075 */ 14076 if (SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv)) 14077 tp->rcv_adv = tp->rcv_nxt + recwin; 14078 14079 tp->last_ack_sent = tp->rcv_nxt; 14080 if ((error == 0) && 14081 (bbr->r_ctl.rc_pace_max_segs > tp->t_maxseg) && 14082 (doing_tlp == 0) && 14083 (tso == 0) && 14084 (len > 0) && 14085 ((flags & TH_RST) == 0) && 14086 ((flags & TH_SYN) == 0) && 14087 (IN_RECOVERY(tp->t_flags) == 0) && 14088 (bbr->rc_in_persist == 0) && 14089 (tot_len < bbr->r_ctl.rc_pace_max_segs)) { 14090 /* 14091 * For non-tso we need to goto again until we have sent out 14092 * enough data to match what we are hptsi out every hptsi 14093 * interval. 14094 */ 14095 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14096 /* Make sure snd_nxt is drug up */ 14097 tp->snd_nxt = tp->snd_max; 14098 } 14099 if (rsm != NULL) { 14100 rsm = NULL; 14101 goto skip_again; 14102 } 14103 rsm = NULL; 14104 sack_rxmit = 0; 14105 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK); 14106 goto again; 14107 } 14108 skip_again: 14109 if ((error == 0) && (flags & TH_FIN)) 14110 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_FIN); 14111 if ((error == 0) && (flags & TH_RST)) 14112 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 14113 if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) { 14114 /* 14115 * Calculate/Re-Calculate the hptsi slot in usecs based on 14116 * what we have sent so far 14117 */ 14118 slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); 14119 if (bbr->rc_no_pacing) 14120 slot = 0; 14121 } 14122 tp->t_flags &= ~(TF_ACKNOW | TF_DELACK); 14123 enobufs: 14124 if (bbr->rc_use_google == 0) 14125 bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); 14126 bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + 14127 bbr->r_ctl.rc_lost_bytes))); 14128 bbr->rc_output_starts_timer = 1; 14129 if (bbr->bbr_use_rack_cheat && 14130 (more_to_rxt || 14131 ((bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts)) != NULL))) { 14132 /* Rack cheats and shotguns out all rxt's 1ms apart */ 14133 if (slot > 1000) 14134 slot = 1000; 14135 } 14136 if (bbr->bbr_hdrw_pacing && (bbr->hw_pacing_set == 0)) { 14137 /* 14138 * We don't change the tso size until some number of sends 14139 * to give the hardware commands time to get down 14140 * to the interface. 14141 */ 14142 bbr->r_ctl.bbr_hdwr_cnt_noset_snt++; 14143 if (bbr->r_ctl.bbr_hdwr_cnt_noset_snt >= bbr_hdwr_pacing_delay_cnt) { 14144 bbr->hw_pacing_set = 1; 14145 tcp_bbr_tso_size_check(bbr, cts); 14146 } 14147 } 14148 bbr_start_hpts_timer(bbr, tp, cts, 12, slot, tot_len); 14149 if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { 14150 /* Make sure snd_nxt is drug up */ 14151 tp->snd_nxt = tp->snd_max; 14152 } 14153 return (error); 14154 14155 } 14156 14157 /* 14158 * See bbr_output_wtime() for return values. 14159 */ 14160 static int 14161 bbr_output(struct tcpcb *tp) 14162 { 14163 int32_t ret; 14164 struct timeval tv; 14165 struct tcp_bbr *bbr; 14166 14167 NET_EPOCH_ASSERT(); 14168 14169 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14170 INP_WLOCK_ASSERT(tp->t_inpcb); 14171 (void)tcp_get_usecs(&tv); 14172 ret = bbr_output_wtime(tp, &tv); 14173 return (ret); 14174 } 14175 14176 static void 14177 bbr_mtu_chg(struct tcpcb *tp) 14178 { 14179 struct tcp_bbr *bbr; 14180 struct bbr_sendmap *rsm, *frsm = NULL; 14181 uint32_t maxseg; 14182 14183 /* 14184 * The MTU has changed. a) Clear the sack filter. b) Mark everything 14185 * over the current size as SACK_PASS so a retransmit will occur. 14186 */ 14187 14188 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14189 maxseg = tp->t_maxseg - bbr->rc_last_options; 14190 sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); 14191 TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { 14192 /* Don't mess with ones acked (by sack?) */ 14193 if (rsm->r_flags & BBR_ACKED) 14194 continue; 14195 if ((rsm->r_end - rsm->r_start) > maxseg) { 14196 /* 14197 * We mark sack-passed on all the previous large 14198 * sends we did. This will force them to retransmit. 14199 */ 14200 rsm->r_flags |= BBR_SACK_PASSED; 14201 if (((rsm->r_flags & BBR_MARKED_LOST) == 0) && 14202 bbr_is_lost(bbr, rsm, bbr->r_ctl.rc_rcvtime)) { 14203 bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; 14204 bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; 14205 rsm->r_flags |= BBR_MARKED_LOST; 14206 } 14207 if (frsm == NULL) 14208 frsm = rsm; 14209 } 14210 } 14211 if (frsm) { 14212 bbr->r_ctl.rc_resend = frsm; 14213 } 14214 } 14215 14216 static int 14217 bbr_pru_options(struct tcpcb *tp, int flags) 14218 { 14219 if (flags & PRUS_OOB) 14220 return (EOPNOTSUPP); 14221 return (0); 14222 } 14223 14224 struct tcp_function_block __tcp_bbr = { 14225 .tfb_tcp_block_name = __XSTRING(STACKNAME), 14226 .tfb_tcp_output = bbr_output, 14227 .tfb_do_queued_segments = ctf_do_queued_segments, 14228 .tfb_do_segment_nounlock = bbr_do_segment_nounlock, 14229 .tfb_tcp_do_segment = bbr_do_segment, 14230 .tfb_tcp_ctloutput = bbr_ctloutput, 14231 .tfb_tcp_fb_init = bbr_init, 14232 .tfb_tcp_fb_fini = bbr_fini, 14233 .tfb_tcp_timer_stop_all = bbr_stopall, 14234 .tfb_tcp_timer_activate = bbr_timer_activate, 14235 .tfb_tcp_timer_active = bbr_timer_active, 14236 .tfb_tcp_timer_stop = bbr_timer_stop, 14237 .tfb_tcp_rexmit_tmr = bbr_remxt_tmr, 14238 .tfb_tcp_handoff_ok = bbr_handoff_ok, 14239 .tfb_tcp_mtu_chg = bbr_mtu_chg, 14240 .tfb_pru_options = bbr_pru_options, 14241 }; 14242 14243 /* 14244 * bbr_ctloutput() must drop the inpcb lock before performing copyin on 14245 * socket option arguments. When it re-acquires the lock after the copy, it 14246 * has to revalidate that the connection is still valid for the socket 14247 * option. 14248 */ 14249 static int 14250 bbr_set_sockopt(struct socket *so, struct sockopt *sopt, 14251 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14252 { 14253 struct epoch_tracker et; 14254 int32_t error = 0, optval; 14255 14256 switch (sopt->sopt_level) { 14257 case IPPROTO_IPV6: 14258 case IPPROTO_IP: 14259 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14260 } 14261 14262 switch (sopt->sopt_name) { 14263 case TCP_RACK_PACE_MAX_SEG: 14264 case TCP_RACK_MIN_TO: 14265 case TCP_RACK_REORD_THRESH: 14266 case TCP_RACK_REORD_FADE: 14267 case TCP_RACK_TLP_THRESH: 14268 case TCP_RACK_PKT_DELAY: 14269 case TCP_BBR_ALGORITHM: 14270 case TCP_BBR_TSLIMITS: 14271 case TCP_BBR_IWINTSO: 14272 case TCP_BBR_RECFORCE: 14273 case TCP_BBR_STARTUP_PG: 14274 case TCP_BBR_DRAIN_PG: 14275 case TCP_BBR_RWND_IS_APP: 14276 case TCP_BBR_PROBE_RTT_INT: 14277 case TCP_BBR_PROBE_RTT_GAIN: 14278 case TCP_BBR_PROBE_RTT_LEN: 14279 case TCP_BBR_STARTUP_LOSS_EXIT: 14280 case TCP_BBR_USEDEL_RATE: 14281 case TCP_BBR_MIN_RTO: 14282 case TCP_BBR_MAX_RTO: 14283 case TCP_BBR_PACE_PER_SEC: 14284 case TCP_DELACK: 14285 case TCP_BBR_PACE_DEL_TAR: 14286 case TCP_BBR_SEND_IWND_IN_TSO: 14287 case TCP_BBR_EXTRA_STATE: 14288 case TCP_BBR_UTTER_MAX_TSO: 14289 case TCP_BBR_MIN_TOPACEOUT: 14290 case TCP_BBR_FLOOR_MIN_TSO: 14291 case TCP_BBR_TSTMP_RAISES: 14292 case TCP_BBR_POLICER_DETECT: 14293 case TCP_BBR_USE_RACK_CHEAT: 14294 case TCP_DATA_AFTER_CLOSE: 14295 case TCP_BBR_HDWR_PACE: 14296 case TCP_BBR_PACE_SEG_MAX: 14297 case TCP_BBR_PACE_SEG_MIN: 14298 case TCP_BBR_PACE_CROSS: 14299 case TCP_BBR_PACE_OH: 14300 #ifdef NETFLIX_PEAKRATE 14301 case TCP_MAXPEAKRATE: 14302 #endif 14303 case TCP_BBR_TMR_PACE_OH: 14304 case TCP_BBR_RACK_RTT_USE: 14305 case TCP_BBR_RETRAN_WTSO: 14306 break; 14307 default: 14308 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14309 break; 14310 } 14311 INP_WUNLOCK(inp); 14312 error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); 14313 if (error) 14314 return (error); 14315 INP_WLOCK(inp); 14316 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 14317 INP_WUNLOCK(inp); 14318 return (ECONNRESET); 14319 } 14320 tp = intotcpcb(inp); 14321 if (tp->t_fb != &__tcp_bbr) { 14322 INP_WUNLOCK(inp); 14323 return (ENOPROTOOPT); 14324 } 14325 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14326 switch (sopt->sopt_name) { 14327 case TCP_BBR_PACE_PER_SEC: 14328 BBR_OPTS_INC(tcp_bbr_pace_per_sec); 14329 bbr->r_ctl.bbr_hptsi_per_second = optval; 14330 break; 14331 case TCP_BBR_PACE_DEL_TAR: 14332 BBR_OPTS_INC(tcp_bbr_pace_del_tar); 14333 bbr->r_ctl.bbr_hptsi_segments_delay_tar = optval; 14334 break; 14335 case TCP_BBR_PACE_SEG_MAX: 14336 BBR_OPTS_INC(tcp_bbr_pace_seg_max); 14337 bbr->r_ctl.bbr_hptsi_segments_max = optval; 14338 break; 14339 case TCP_BBR_PACE_SEG_MIN: 14340 BBR_OPTS_INC(tcp_bbr_pace_seg_min); 14341 bbr->r_ctl.bbr_hptsi_bytes_min = optval; 14342 break; 14343 case TCP_BBR_PACE_CROSS: 14344 BBR_OPTS_INC(tcp_bbr_pace_cross); 14345 bbr->r_ctl.bbr_cross_over = optval; 14346 break; 14347 case TCP_BBR_ALGORITHM: 14348 BBR_OPTS_INC(tcp_bbr_algorithm); 14349 if (optval && (bbr->rc_use_google == 0)) { 14350 /* Turn on the google mode */ 14351 bbr_google_mode_on(bbr); 14352 if ((optval > 3) && (optval < 500)) { 14353 /* 14354 * Must be at least greater than .3% 14355 * and must be less than 50.0%. 14356 */ 14357 bbr->r_ctl.bbr_google_discount = optval; 14358 } 14359 } else if ((optval == 0) && (bbr->rc_use_google == 1)) { 14360 /* Turn off the google mode */ 14361 bbr_google_mode_off(bbr); 14362 } 14363 break; 14364 case TCP_BBR_TSLIMITS: 14365 BBR_OPTS_INC(tcp_bbr_tslimits); 14366 if (optval == 1) 14367 bbr->rc_use_ts_limit = 1; 14368 else if (optval == 0) 14369 bbr->rc_use_ts_limit = 0; 14370 else 14371 error = EINVAL; 14372 break; 14373 14374 case TCP_BBR_IWINTSO: 14375 BBR_OPTS_INC(tcp_bbr_iwintso); 14376 if ((optval >= 0) && (optval < 128)) { 14377 uint32_t twin; 14378 14379 bbr->rc_init_win = optval; 14380 twin = bbr_initial_cwnd(bbr, tp); 14381 if ((bbr->rc_past_init_win == 0) && (twin > tp->snd_cwnd)) 14382 tp->snd_cwnd = twin; 14383 else 14384 error = EBUSY; 14385 } else 14386 error = EINVAL; 14387 break; 14388 case TCP_BBR_STARTUP_PG: 14389 BBR_OPTS_INC(tcp_bbr_startup_pg); 14390 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) { 14391 bbr->r_ctl.rc_startup_pg = optval; 14392 if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { 14393 bbr->r_ctl.rc_bbr_hptsi_gain = optval; 14394 } 14395 } else 14396 error = EINVAL; 14397 break; 14398 case TCP_BBR_DRAIN_PG: 14399 BBR_OPTS_INC(tcp_bbr_drain_pg); 14400 if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) 14401 bbr->r_ctl.rc_drain_pg = optval; 14402 else 14403 error = EINVAL; 14404 break; 14405 case TCP_BBR_PROBE_RTT_LEN: 14406 BBR_OPTS_INC(tcp_bbr_probertt_len); 14407 if (optval <= 1) 14408 reset_time_small(&bbr->r_ctl.rc_rttprop, (optval * USECS_IN_SECOND)); 14409 else 14410 error = EINVAL; 14411 break; 14412 case TCP_BBR_PROBE_RTT_GAIN: 14413 BBR_OPTS_INC(tcp_bbr_probertt_gain); 14414 if (optval <= BBR_UNIT) 14415 bbr->r_ctl.bbr_rttprobe_gain_val = optval; 14416 else 14417 error = EINVAL; 14418 break; 14419 case TCP_BBR_PROBE_RTT_INT: 14420 BBR_OPTS_INC(tcp_bbr_probe_rtt_int); 14421 if (optval > 1000) 14422 bbr->r_ctl.rc_probertt_int = optval; 14423 else 14424 error = EINVAL; 14425 break; 14426 case TCP_BBR_MIN_TOPACEOUT: 14427 BBR_OPTS_INC(tcp_bbr_topaceout); 14428 if (optval == 0) { 14429 bbr->no_pacing_until = 0; 14430 bbr->rc_no_pacing = 0; 14431 } else if (optval <= 0x00ff) { 14432 bbr->no_pacing_until = optval; 14433 if ((bbr->r_ctl.rc_pkt_epoch < bbr->no_pacing_until) && 14434 (bbr->rc_bbr_state == BBR_STATE_STARTUP)){ 14435 /* Turn on no pacing */ 14436 bbr->rc_no_pacing = 1; 14437 } 14438 } else 14439 error = EINVAL; 14440 break; 14441 case TCP_BBR_STARTUP_LOSS_EXIT: 14442 BBR_OPTS_INC(tcp_bbr_startup_loss_exit); 14443 bbr->rc_loss_exit = optval; 14444 break; 14445 case TCP_BBR_USEDEL_RATE: 14446 error = EINVAL; 14447 break; 14448 case TCP_BBR_MIN_RTO: 14449 BBR_OPTS_INC(tcp_bbr_min_rto); 14450 bbr->r_ctl.rc_min_rto_ms = optval; 14451 break; 14452 case TCP_BBR_MAX_RTO: 14453 BBR_OPTS_INC(tcp_bbr_max_rto); 14454 bbr->rc_max_rto_sec = optval; 14455 break; 14456 case TCP_RACK_MIN_TO: 14457 /* Minimum time between rack t-o's in ms */ 14458 BBR_OPTS_INC(tcp_rack_min_to); 14459 bbr->r_ctl.rc_min_to = optval; 14460 break; 14461 case TCP_RACK_REORD_THRESH: 14462 /* RACK reorder threshold (shift amount) */ 14463 BBR_OPTS_INC(tcp_rack_reord_thresh); 14464 if ((optval > 0) && (optval < 31)) 14465 bbr->r_ctl.rc_reorder_shift = optval; 14466 else 14467 error = EINVAL; 14468 break; 14469 case TCP_RACK_REORD_FADE: 14470 /* Does reordering fade after ms time */ 14471 BBR_OPTS_INC(tcp_rack_reord_fade); 14472 bbr->r_ctl.rc_reorder_fade = optval; 14473 break; 14474 case TCP_RACK_TLP_THRESH: 14475 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 14476 BBR_OPTS_INC(tcp_rack_tlp_thresh); 14477 if (optval) 14478 bbr->rc_tlp_threshold = optval; 14479 else 14480 error = EINVAL; 14481 break; 14482 case TCP_BBR_USE_RACK_CHEAT: 14483 BBR_OPTS_INC(tcp_use_rackcheat); 14484 if (bbr->rc_use_google) { 14485 error = EINVAL; 14486 break; 14487 } 14488 BBR_OPTS_INC(tcp_rack_cheat); 14489 if (optval) 14490 bbr->bbr_use_rack_cheat = 1; 14491 else 14492 bbr->bbr_use_rack_cheat = 0; 14493 break; 14494 case TCP_BBR_FLOOR_MIN_TSO: 14495 BBR_OPTS_INC(tcp_utter_max_tso); 14496 if ((optval >= 0) && (optval < 40)) 14497 bbr->r_ctl.bbr_hptsi_segments_floor = optval; 14498 else 14499 error = EINVAL; 14500 break; 14501 case TCP_BBR_UTTER_MAX_TSO: 14502 BBR_OPTS_INC(tcp_utter_max_tso); 14503 if ((optval >= 0) && (optval < 0xffff)) 14504 bbr->r_ctl.bbr_utter_max = optval; 14505 else 14506 error = EINVAL; 14507 break; 14508 14509 case TCP_BBR_EXTRA_STATE: 14510 BBR_OPTS_INC(tcp_extra_state); 14511 if (optval) 14512 bbr->rc_use_idle_restart = 1; 14513 else 14514 bbr->rc_use_idle_restart = 0; 14515 break; 14516 case TCP_BBR_SEND_IWND_IN_TSO: 14517 BBR_OPTS_INC(tcp_iwnd_tso); 14518 if (optval) { 14519 bbr->bbr_init_win_cheat = 1; 14520 if (bbr->rc_past_init_win == 0) { 14521 uint32_t cts; 14522 cts = tcp_get_usecs(&bbr->rc_tv); 14523 tcp_bbr_tso_size_check(bbr, cts); 14524 } 14525 } else 14526 bbr->bbr_init_win_cheat = 0; 14527 break; 14528 case TCP_BBR_HDWR_PACE: 14529 BBR_OPTS_INC(tcp_hdwr_pacing); 14530 if (optval){ 14531 bbr->bbr_hdw_pace_ena = 1; 14532 bbr->bbr_attempt_hdwr_pace = 0; 14533 } else { 14534 bbr->bbr_hdw_pace_ena = 0; 14535 #ifdef RATELIMIT 14536 if (bbr->r_ctl.crte != NULL) { 14537 tcp_rel_pacing_rate(bbr->r_ctl.crte, tp); 14538 bbr->r_ctl.crte = NULL; 14539 } 14540 #endif 14541 } 14542 break; 14543 14544 case TCP_DELACK: 14545 BBR_OPTS_INC(tcp_delack); 14546 if (optval < 100) { 14547 if (optval == 0) /* off */ 14548 tp->t_delayed_ack = 0; 14549 else if (optval == 1) /* on which is 2 */ 14550 tp->t_delayed_ack = 2; 14551 else /* higher than 2 and less than 100 */ 14552 tp->t_delayed_ack = optval; 14553 if (tp->t_flags & TF_DELACK) { 14554 tp->t_flags &= ~TF_DELACK; 14555 tp->t_flags |= TF_ACKNOW; 14556 NET_EPOCH_ENTER(et); 14557 bbr_output(tp); 14558 NET_EPOCH_EXIT(et); 14559 } 14560 } else 14561 error = EINVAL; 14562 break; 14563 case TCP_RACK_PKT_DELAY: 14564 /* RACK added ms i.e. rack-rtt + reord + N */ 14565 BBR_OPTS_INC(tcp_rack_pkt_delay); 14566 bbr->r_ctl.rc_pkt_delay = optval; 14567 break; 14568 #ifdef NETFLIX_PEAKRATE 14569 case TCP_MAXPEAKRATE: 14570 BBR_OPTS_INC(tcp_maxpeak); 14571 error = tcp_set_maxpeakrate(tp, optval); 14572 if (!error) 14573 tp->t_peakrate_thr = tp->t_maxpeakrate; 14574 break; 14575 #endif 14576 case TCP_BBR_RETRAN_WTSO: 14577 BBR_OPTS_INC(tcp_retran_wtso); 14578 if (optval) 14579 bbr->rc_resends_use_tso = 1; 14580 else 14581 bbr->rc_resends_use_tso = 0; 14582 break; 14583 case TCP_DATA_AFTER_CLOSE: 14584 BBR_OPTS_INC(tcp_data_ac); 14585 if (optval) 14586 bbr->rc_allow_data_af_clo = 1; 14587 else 14588 bbr->rc_allow_data_af_clo = 0; 14589 break; 14590 case TCP_BBR_POLICER_DETECT: 14591 BBR_OPTS_INC(tcp_policer_det); 14592 if (bbr->rc_use_google == 0) 14593 error = EINVAL; 14594 else if (optval) 14595 bbr->r_use_policer = 1; 14596 else 14597 bbr->r_use_policer = 0; 14598 break; 14599 14600 case TCP_BBR_TSTMP_RAISES: 14601 BBR_OPTS_INC(tcp_ts_raises); 14602 if (optval) 14603 bbr->ts_can_raise = 1; 14604 else 14605 bbr->ts_can_raise = 0; 14606 break; 14607 case TCP_BBR_TMR_PACE_OH: 14608 BBR_OPTS_INC(tcp_pacing_oh_tmr); 14609 if (bbr->rc_use_google) { 14610 error = EINVAL; 14611 } else { 14612 if (optval) 14613 bbr->r_ctl.rc_incr_tmrs = 1; 14614 else 14615 bbr->r_ctl.rc_incr_tmrs = 0; 14616 } 14617 break; 14618 case TCP_BBR_PACE_OH: 14619 BBR_OPTS_INC(tcp_pacing_oh); 14620 if (bbr->rc_use_google) { 14621 error = EINVAL; 14622 } else { 14623 if (optval > (BBR_INCL_TCP_OH| 14624 BBR_INCL_IP_OH| 14625 BBR_INCL_ENET_OH)) { 14626 error = EINVAL; 14627 break; 14628 } 14629 if (optval & BBR_INCL_TCP_OH) 14630 bbr->r_ctl.rc_inc_tcp_oh = 1; 14631 else 14632 bbr->r_ctl.rc_inc_tcp_oh = 0; 14633 if (optval & BBR_INCL_IP_OH) 14634 bbr->r_ctl.rc_inc_ip_oh = 1; 14635 else 14636 bbr->r_ctl.rc_inc_ip_oh = 0; 14637 if (optval & BBR_INCL_ENET_OH) 14638 bbr->r_ctl.rc_inc_enet_oh = 1; 14639 else 14640 bbr->r_ctl.rc_inc_enet_oh = 0; 14641 } 14642 break; 14643 default: 14644 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14645 break; 14646 } 14647 #ifdef NETFLIX_STATS 14648 tcp_log_socket_option(tp, sopt->sopt_name, optval, error); 14649 #endif 14650 INP_WUNLOCK(inp); 14651 return (error); 14652 } 14653 14654 /* 14655 * return 0 on success, error-num on failure 14656 */ 14657 static int 14658 bbr_get_sockopt(struct socket *so, struct sockopt *sopt, 14659 struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) 14660 { 14661 int32_t error, optval; 14662 14663 /* 14664 * Because all our options are either boolean or an int, we can just 14665 * pull everything into optval and then unlock and copy. If we ever 14666 * add a option that is not a int, then this will have quite an 14667 * impact to this routine. 14668 */ 14669 switch (sopt->sopt_name) { 14670 case TCP_BBR_PACE_PER_SEC: 14671 optval = bbr->r_ctl.bbr_hptsi_per_second; 14672 break; 14673 case TCP_BBR_PACE_DEL_TAR: 14674 optval = bbr->r_ctl.bbr_hptsi_segments_delay_tar; 14675 break; 14676 case TCP_BBR_PACE_SEG_MAX: 14677 optval = bbr->r_ctl.bbr_hptsi_segments_max; 14678 break; 14679 case TCP_BBR_MIN_TOPACEOUT: 14680 optval = bbr->no_pacing_until; 14681 break; 14682 case TCP_BBR_PACE_SEG_MIN: 14683 optval = bbr->r_ctl.bbr_hptsi_bytes_min; 14684 break; 14685 case TCP_BBR_PACE_CROSS: 14686 optval = bbr->r_ctl.bbr_cross_over; 14687 break; 14688 case TCP_BBR_ALGORITHM: 14689 optval = bbr->rc_use_google; 14690 break; 14691 case TCP_BBR_TSLIMITS: 14692 optval = bbr->rc_use_ts_limit; 14693 break; 14694 case TCP_BBR_IWINTSO: 14695 optval = bbr->rc_init_win; 14696 break; 14697 case TCP_BBR_STARTUP_PG: 14698 optval = bbr->r_ctl.rc_startup_pg; 14699 break; 14700 case TCP_BBR_DRAIN_PG: 14701 optval = bbr->r_ctl.rc_drain_pg; 14702 break; 14703 case TCP_BBR_PROBE_RTT_INT: 14704 optval = bbr->r_ctl.rc_probertt_int; 14705 break; 14706 case TCP_BBR_PROBE_RTT_LEN: 14707 optval = (bbr->r_ctl.rc_rttprop.cur_time_limit / USECS_IN_SECOND); 14708 break; 14709 case TCP_BBR_PROBE_RTT_GAIN: 14710 optval = bbr->r_ctl.bbr_rttprobe_gain_val; 14711 break; 14712 case TCP_BBR_STARTUP_LOSS_EXIT: 14713 optval = bbr->rc_loss_exit; 14714 break; 14715 case TCP_BBR_USEDEL_RATE: 14716 error = EINVAL; 14717 break; 14718 case TCP_BBR_MIN_RTO: 14719 optval = bbr->r_ctl.rc_min_rto_ms; 14720 break; 14721 case TCP_BBR_MAX_RTO: 14722 optval = bbr->rc_max_rto_sec; 14723 break; 14724 case TCP_RACK_PACE_MAX_SEG: 14725 /* Max segments in a pace */ 14726 optval = bbr->r_ctl.rc_pace_max_segs; 14727 break; 14728 case TCP_RACK_MIN_TO: 14729 /* Minimum time between rack t-o's in ms */ 14730 optval = bbr->r_ctl.rc_min_to; 14731 break; 14732 case TCP_RACK_REORD_THRESH: 14733 /* RACK reorder threshold (shift amount) */ 14734 optval = bbr->r_ctl.rc_reorder_shift; 14735 break; 14736 case TCP_RACK_REORD_FADE: 14737 /* Does reordering fade after ms time */ 14738 optval = bbr->r_ctl.rc_reorder_fade; 14739 break; 14740 case TCP_BBR_USE_RACK_CHEAT: 14741 /* Do we use the rack cheat for rxt */ 14742 optval = bbr->bbr_use_rack_cheat; 14743 break; 14744 case TCP_BBR_FLOOR_MIN_TSO: 14745 optval = bbr->r_ctl.bbr_hptsi_segments_floor; 14746 break; 14747 case TCP_BBR_UTTER_MAX_TSO: 14748 optval = bbr->r_ctl.bbr_utter_max; 14749 break; 14750 case TCP_BBR_SEND_IWND_IN_TSO: 14751 /* Do we send TSO size segments initially */ 14752 optval = bbr->bbr_init_win_cheat; 14753 break; 14754 case TCP_BBR_EXTRA_STATE: 14755 optval = bbr->rc_use_idle_restart; 14756 break; 14757 case TCP_RACK_TLP_THRESH: 14758 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 14759 optval = bbr->rc_tlp_threshold; 14760 break; 14761 case TCP_RACK_PKT_DELAY: 14762 /* RACK added ms i.e. rack-rtt + reord + N */ 14763 optval = bbr->r_ctl.rc_pkt_delay; 14764 break; 14765 case TCP_BBR_RETRAN_WTSO: 14766 optval = bbr->rc_resends_use_tso; 14767 break; 14768 case TCP_DATA_AFTER_CLOSE: 14769 optval = bbr->rc_allow_data_af_clo; 14770 break; 14771 case TCP_DELACK: 14772 optval = tp->t_delayed_ack; 14773 break; 14774 case TCP_BBR_HDWR_PACE: 14775 optval = bbr->bbr_hdw_pace_ena; 14776 break; 14777 case TCP_BBR_POLICER_DETECT: 14778 optval = bbr->r_use_policer; 14779 break; 14780 case TCP_BBR_TSTMP_RAISES: 14781 optval = bbr->ts_can_raise; 14782 break; 14783 case TCP_BBR_TMR_PACE_OH: 14784 optval = bbr->r_ctl.rc_incr_tmrs; 14785 break; 14786 case TCP_BBR_PACE_OH: 14787 optval = 0; 14788 if (bbr->r_ctl.rc_inc_tcp_oh) 14789 optval |= BBR_INCL_TCP_OH; 14790 if (bbr->r_ctl.rc_inc_ip_oh) 14791 optval |= BBR_INCL_IP_OH; 14792 if (bbr->r_ctl.rc_inc_enet_oh) 14793 optval |= BBR_INCL_ENET_OH; 14794 break; 14795 default: 14796 return (tcp_default_ctloutput(so, sopt, inp, tp)); 14797 break; 14798 } 14799 INP_WUNLOCK(inp); 14800 error = sooptcopyout(sopt, &optval, sizeof optval); 14801 return (error); 14802 } 14803 14804 /* 14805 * return 0 on success, error-num on failure 14806 */ 14807 static int 14808 bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 14809 { 14810 int32_t error = EINVAL; 14811 struct tcp_bbr *bbr; 14812 14813 bbr = (struct tcp_bbr *)tp->t_fb_ptr; 14814 if (bbr == NULL) { 14815 /* Huh? */ 14816 goto out; 14817 } 14818 if (sopt->sopt_dir == SOPT_SET) { 14819 return (bbr_set_sockopt(so, sopt, inp, tp, bbr)); 14820 } else if (sopt->sopt_dir == SOPT_GET) { 14821 return (bbr_get_sockopt(so, sopt, inp, tp, bbr)); 14822 } 14823 out: 14824 INP_WUNLOCK(inp); 14825 return (error); 14826 } 14827 14828 static const char *bbr_stack_names[] = { 14829 __XSTRING(STACKNAME), 14830 #ifdef STACKALIAS 14831 __XSTRING(STACKALIAS), 14832 #endif 14833 }; 14834 14835 static bool bbr_mod_inited = false; 14836 14837 static int 14838 tcp_addbbr(module_t mod, int32_t type, void *data) 14839 { 14840 int32_t err = 0; 14841 int num_stacks; 14842 14843 switch (type) { 14844 case MOD_LOAD: 14845 printf("Attempting to load " __XSTRING(MODNAME) "\n"); 14846 bbr_zone = uma_zcreate(__XSTRING(MODNAME) "_map", 14847 sizeof(struct bbr_sendmap), 14848 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 14849 bbr_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb", 14850 sizeof(struct tcp_bbr), 14851 NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); 14852 sysctl_ctx_init(&bbr_sysctl_ctx); 14853 bbr_sysctl_root = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, 14854 SYSCTL_STATIC_CHILDREN(_net_inet_tcp), 14855 OID_AUTO, 14856 #ifdef STACKALIAS 14857 __XSTRING(STACKALIAS), 14858 #else 14859 __XSTRING(STACKNAME), 14860 #endif 14861 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 14862 ""); 14863 if (bbr_sysctl_root == NULL) { 14864 printf("Failed to add sysctl node\n"); 14865 err = EFAULT; 14866 goto free_uma; 14867 } 14868 bbr_init_sysctls(); 14869 num_stacks = nitems(bbr_stack_names); 14870 err = register_tcp_functions_as_names(&__tcp_bbr, M_WAITOK, 14871 bbr_stack_names, &num_stacks); 14872 if (err) { 14873 printf("Failed to register %s stack name for " 14874 "%s module\n", bbr_stack_names[num_stacks], 14875 __XSTRING(MODNAME)); 14876 sysctl_ctx_free(&bbr_sysctl_ctx); 14877 free_uma: 14878 uma_zdestroy(bbr_zone); 14879 uma_zdestroy(bbr_pcb_zone); 14880 bbr_counter_destroy(); 14881 printf("Failed to register " __XSTRING(MODNAME) 14882 " module err:%d\n", err); 14883 return (err); 14884 } 14885 tcp_lro_reg_mbufq(); 14886 bbr_mod_inited = true; 14887 printf(__XSTRING(MODNAME) " is now available\n"); 14888 break; 14889 case MOD_QUIESCE: 14890 err = deregister_tcp_functions(&__tcp_bbr, true, false); 14891 break; 14892 case MOD_UNLOAD: 14893 err = deregister_tcp_functions(&__tcp_bbr, false, true); 14894 if (err == EBUSY) 14895 break; 14896 if (bbr_mod_inited) { 14897 uma_zdestroy(bbr_zone); 14898 uma_zdestroy(bbr_pcb_zone); 14899 sysctl_ctx_free(&bbr_sysctl_ctx); 14900 bbr_counter_destroy(); 14901 printf(__XSTRING(MODNAME) 14902 " is now no longer available\n"); 14903 bbr_mod_inited = false; 14904 } 14905 tcp_lro_dereg_mbufq(); 14906 err = 0; 14907 break; 14908 default: 14909 return (EOPNOTSUPP); 14910 } 14911 return (err); 14912 } 14913 14914 static moduledata_t tcp_bbr = { 14915 .name = __XSTRING(MODNAME), 14916 .evhand = tcp_addbbr, 14917 .priv = 0 14918 }; 14919 14920 MODULE_VERSION(MODNAME, 1); 14921 DECLARE_MODULE(MODNAME, tcp_bbr, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 14922 MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1); 14923