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 #ifndef _NETINET_TCP_BBR_H_ 27 #define _NETINET_TCP_BBR_H_ 28 29 #define BBR_INITIAL_RTO 1000000 /* 1 second in micro-seconds */ 30 /* Send map flags */ 31 #define BBR_ACKED 0x0001 /* The remote endpoint acked this */ 32 #define BBR_WAS_RENEGED 0x0002 /* The peer reneged the ack */ 33 #define BBR_RXT_CLEARED 0x0004 /* ACK Cleared by the RXT timer */ 34 #define BBR_OVERMAX 0x0008 /* We have more retran's then we can 35 * fit */ 36 #define BBR_SACK_PASSED 0x0010 /* A sack was done above this block */ 37 #define BBR_WAS_SACKPASS 0x0020 /* We retransmitted due to SACK pass */ 38 #define BBR_HAS_FIN 0x0040 /* segment is sent with fin */ 39 #define BBR_TLP 0x0080 /* segment sent as tail-loss-probe */ 40 #define BBR_HAS_SYN 0x0100 /* segment has the syn */ 41 #define BBR_MARKED_LOST 0x0200 /* 42 * This segments is lost and 43 * totaled into bbr->rc_ctl.rc_lost 44 */ 45 #define BBR_RWND_COLLAPSED 0x0400 /* The peer collapsed the rwnd on the segment */ 46 #define BBR_NUM_OF_RETRANS 7 47 48 /* Defines for socket options to set pacing overheads */ 49 #define BBR_INCL_ENET_OH 0x01 50 #define BBR_INCL_IP_OH 0x02 51 #define BBR_INCL_TCP_OH 0x03 52 53 /* 54 * With the addition of both measurement algorithms 55 * I had to move over the size of a 56 * cache line (unfortunately). For now there is 57 * no way around this. We may be able to cut back 58 * at some point I hope. 59 */ 60 struct bbr_sendmap { 61 TAILQ_ENTRY(bbr_sendmap) r_next; /* seq number arrayed next */ 62 TAILQ_ENTRY(bbr_sendmap) r_tnext; /* Time of tmit based next */ 63 uint32_t r_start; /* Sequence number of the segment */ 64 uint32_t r_end; /* End seq, this is 1 beyond actually */ 65 66 uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ 67 uint32_t r_delivered; /* Delivered amount at send */ 68 69 uint32_t r_del_time; /* The time of the last delivery update */ 70 uint8_t r_rtr_cnt:4, /* Retran count, index this -1 to get time 71 * sent */ 72 r_rtt_not_allowed:1, /* No rtt measurement allowed */ 73 r_is_drain:1, /* In a draining cycle */ 74 r_app_limited:1,/* We went app limited */ 75 r_ts_valid:1; /* Timestamp field is valid (r_del_ack_ts) */ 76 uint8_t r_dupack; /* Dup ack count */ 77 uint8_t r_in_tmap:1, /* Flag to see if its in the r_tnext array */ 78 r_is_smallmap:1,/* Was logged as a small-map send-map item */ 79 r_is_gain:1, /* Was in gain cycle */ 80 r_bbr_state:5; /* The BBR state at send */ 81 uint8_t r_limit_type; /* is this entry counted against a limit? */ 82 83 uint16_t r_flags; /* Flags as defined above */ 84 uint16_t r_spare16; 85 uint32_t r_del_ack_ts; /* At send what timestamp of peer was (if r_ts_valid set) */ 86 /****************Cache line*****************/ 87 uint32_t r_tim_lastsent[BBR_NUM_OF_RETRANS]; 88 /* 89 * Question, should we instead just grab the sending b/w 90 * from the filter with the gain and store it in a 91 * uint64_t instead? 92 */ 93 uint32_t r_first_sent_time; /* Time of first pkt in flight sent */ 94 uint32_t r_pacing_delay; /* pacing delay of this send */ 95 uint32_t r_flight_at_send; /* flight at the time of the send */ 96 #ifdef _KERNEL 97 } __aligned(CACHE_LINE_SIZE); 98 #else 99 }; 100 #endif 101 #define BBR_LIMIT_TYPE_SPLIT 1 102 103 TAILQ_HEAD(bbr_head, bbr_sendmap); 104 105 #define BBR_SEGMENT_TIME_SIZE 1500 /* How many bytes in time_between */ 106 107 #define BBR_MIN_SEG 1460 /* MSS size */ 108 #define BBR_MAX_GAIN_VALUE 0xffff 109 110 #define BBR_TIMER_FUDGE 1500 /* 1.5ms in micro seconds */ 111 112 /* BW twiddle secret codes */ 113 #define BBR_RED_BW_CONGSIG 0 /* We enter recovery and set using b/w */ 114 #define BBR_RED_BW_RATECAL 1 /* We are calculating the loss rate */ 115 #define BBR_RED_BW_USELRBW 2 /* We are dropping the lower b/w with 116 * cDR */ 117 #define BBR_RED_BW_SETHIGHLOSS 3 /* We have set our highloss value at 118 * exit from probe-rtt */ 119 #define BBR_RED_BW_PE_CLREARLY 4 /* We have decided to clear the 120 * reduction early */ 121 #define BBR_RED_BW_PE_CLAFDEL 5 /* We are clearing it on schedule 122 * delayed */ 123 #define BBR_RED_BW_REC_ENDCLL 6 /* Recover exits save high if needed 124 * an clear to start measuring */ 125 #define BBR_RED_BW_PE_NOEARLY_OUT 7 /* Set pkt epoch judged that we do not 126 * get out of jail early */ 127 /* For calculating a rate */ 128 #define BBR_CALC_BW 1 129 #define BBR_CALC_LOSS 2 130 131 #define BBR_RTT_BY_TIMESTAMP 0 132 #define BBR_RTT_BY_EXACTMATCH 1 133 #define BBR_RTT_BY_EARLIER_RET 2 134 #define BBR_RTT_BY_THIS_RETRAN 3 135 #define BBR_RTT_BY_SOME_RETRAN 4 136 #define BBR_RTT_BY_TSMATCHING 5 137 138 /* Markers to track where we enter persists from */ 139 #define BBR_PERSISTS_FROM_1 1 140 #define BBR_PERSISTS_FROM_2 2 141 #define BBR_PERSISTS_FROM_3 3 142 #define BBR_PERSISTS_FROM_4 4 143 #define BBR_PERSISTS_FROM_5 5 144 145 /* magic cookies to ask for the RTT */ 146 #define BBR_RTT_PROP 0 147 #define BBR_RTT_RACK 1 148 #define BBR_RTT_PKTRTT 2 149 #define BBR_SRTT 3 150 151 #define BBR_SACKED 0 152 #define BBR_CUM_ACKED 1 153 154 /* threshold in useconds where we consider we need a higher min cwnd */ 155 #define BBR_HIGH_SPEED 1000 156 #define BBR_HIGHSPEED_NUM_MSS 12 157 158 #define MAX_REDUCE_RXT 3 /* What is the maximum times we are willing to 159 * reduce b/w in RTX's. Setting this has a 160 * multiplicative effect e.g. if we are 161 * reducing by 20% then setting it to 3 means 162 * you will have reduced the b/w estimate by > 163 * 60% before you stop. */ 164 /* 165 * We use the rate sample structure to 166 * assist in single sack/ack rate and rtt 167 * calculation. In the future we will expand 168 * this in BBR to do forward rate sample 169 * b/w estimation. 170 */ 171 #define BBR_RS_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ 172 #define BBR_RS_BW_EMPTY 0x00000002 /* Nothing yet stored in cDR */ 173 #define BBR_RS_RTT_VALID 0x00000004 /* We have at least one valid RTT */ 174 #define BBR_RS_BW_VAILD 0x00000008 /* We have a valid cDR */ 175 #define BBR_RS_EMPTY (BBR_RS_RTT_EMPTY|BBR_RS_BW_EMPTY) 176 struct bbr_rtt_sample { 177 uint32_t rs_flags; 178 uint32_t rs_rtt_lowest; 179 uint32_t rs_rtt_lowest_sendtime; 180 uint32_t rs_rtt_low_seq_start; 181 182 uint32_t rs_rtt_highest; 183 uint32_t rs_rtt_cnt; 184 185 uint64_t rs_rtt_tot; 186 uint32_t cur_rtt; 187 uint32_t cur_rtt_bytecnt; 188 189 uint32_t cur_rtt_rsmcnt; 190 uint32_t rc_crtt_set:1, 191 avail_bits:31; 192 uint64_t rs_cDR; 193 }; 194 195 /* RTT shrink reasons */ 196 #define BBR_RTTS_INIT 0 197 #define BBR_RTTS_NEWRTT 1 198 #define BBR_RTTS_RTTPROBE 2 199 #define BBR_RTTS_WASIDLE 3 200 #define BBR_RTTS_PERSIST 4 201 #define BBR_RTTS_REACHTAR 5 202 #define BBR_RTTS_ENTERPROBE 6 203 #define BBR_RTTS_SHRINK_PG 7 204 #define BBR_RTTS_SHRINK_PG_FINAL 8 205 #define BBR_RTTS_NEW_TARGET 9 206 #define BBR_RTTS_LEAVE_DRAIN 10 207 #define BBR_RTTS_RESETS_VALUES 11 208 209 #define BBR_NUM_RATES 5 210 /* Rate flags */ 211 #define BBR_RT_FLAG_FREE 0x00 /* Is on the free list */ 212 #define BBR_RT_FLAG_INUSE 0x01 /* Has been allocated */ 213 #define BBR_RT_FLAG_READY 0x02 /* Ready to initiate a measurement. */ 214 #define BBR_RT_FLAG_CAPPED_PRE 0x04 /* Ready to cap if we send the next segment */ 215 #define BBR_RT_FLAG_CAPPED 0x08 /* Measurement is capped */ 216 #define BBR_RT_FLAG_PASTFA 0x10 /* Past the first ack. */ 217 #define BBR_RT_FLAG_LIMITED 0x20 /* Saw application/cwnd or rwnd limited period */ 218 #define BBR_RT_SEEN_A_ACK 0x40 /* A ack has been saved */ 219 #define BBR_RT_PREV_RTT_SET 0x80 /* There was a RTT set in */ 220 #define BBR_RT_PREV_SEND_TIME 0x100 /* 221 *There was a RTT send time set that can be used 222 * no snd_limits 223 */ 224 #define BBR_RT_SET_GRADIENT 0x200 225 #define BBR_RT_TS_VALID 0x400 226 227 struct bbr_log { 228 union { 229 struct bbr_sendmap *rsm; /* For alloc/free */ 230 uint64_t sb_acc; /* For out/ack or t-o */ 231 }; 232 struct tcpcb *tp; 233 uint32_t t_flags; 234 uint32_t th_seq; 235 uint32_t th_ack; 236 uint32_t snd_una; 237 uint32_t snd_nxt; 238 uint32_t snd_max; 239 uint32_t snd_cwnd; 240 uint32_t snd_wnd; 241 uint32_t rc_lost; 242 uint32_t target_cwnd; /* UU */ 243 uint32_t inflight; /* UU */ 244 uint32_t applimited; /* UU */ 245 /* Things for BBR */ 246 uint32_t delivered; /* UU */ 247 uint64_t cur_del_rate; /* UU */ 248 uint64_t delRate; /* UU */ 249 uint64_t rttProp; /* UU */ 250 uint64_t lt_bw; /* UU */ 251 uint32_t timeStamp; 252 uint32_t time; 253 uint32_t slot; /* UU */ 254 uint32_t delayed_by; 255 uint32_t exp_del; 256 uint32_t pkts_out; 257 uint32_t new_win; 258 uint32_t hptsi_gain; /* UU */ 259 uint32_t cwnd_gain; /* UU */ 260 uint32_t epoch; /* UU */ 261 uint32_t lt_epoch; /* UU */ 262 /* Sack fun */ 263 uint32_t blk_start[4]; /* xx */ 264 uint32_t blk_end[4]; 265 uint32_t len; /* Timeout T3=1, TLP=2, RACK=3 */ 266 uint8_t type; 267 uint8_t n_sackblks; 268 uint8_t applied; /* UU */ 269 uint8_t inhpts; /* UU */ 270 uint8_t __spare; /* UU */ 271 uint8_t use_lt_bw; /* UU */ 272 }; 273 274 struct bbr_log_sysctl_out { 275 uint32_t bbr_log_at; 276 uint32_t bbr_log_max; 277 struct bbr_log entries[0]; 278 }; 279 280 /* 281 * Magic numbers for logging timeout events if the 282 * logging is enabled. 283 */ 284 #define BBR_TO_FRM_TMR 1 285 #define BBR_TO_FRM_TLP 2 286 #define BBR_TO_FRM_RACK 3 287 #define BBR_TO_FRM_KEEP 4 288 #define BBR_TO_FRM_PERSIST 5 289 #define BBR_TO_FRM_DELACK 6 290 291 #define BBR_SEES_STRETCH_ACK 1 292 #define BBR_SEES_COMPRESSED_ACKS 2 293 294 /* 295 * As we get each SACK we wade through the 296 * rc_map and mark off what is acked. 297 * We also increment rc_sacked as well. 298 * 299 * We also pay attention to missing entries 300 * based on the time and possibly mark them 301 * for retransmit. If we do and we are not already 302 * in recovery we enter recovery. In doing 303 * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. 304 * We also setup rc_next/rc_snd_nxt/rc_send_end so 305 * we will know where to send from. When not in 306 * recovery rc_next will be NULL and rc_snd_nxt should 307 * equal snd_max. 308 * 309 * Whenever we retransmit from recovery we increment 310 * rc_holes_rxt as we retran a block and mark it as retransmitted 311 * with the time it was sent. During non-recovery sending we 312 * add to our map and note the time down of any send expanding 313 * the rc_map at the tail and moving rc_snd_nxt up with snd_max. 314 * 315 * In recovery during SACK/ACK processing if a chunk has 316 * been retransmitted and it is now acked, we decrement rc_holes_rxt. 317 * When we retransmit from the scoreboard we use 318 * rc_next and rc_snd_nxt/rc_send_end to help us 319 * find what needs to be retran. 320 * 321 * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt 322 * This gets us the effect of RFC6675 pipe, counting twice for 323 * bytes retransmitted. 324 */ 325 326 #define TT_BBR_FR_TMR 0x2001 327 328 #define BBR_SCALE 8 329 #define BBR_UNIT (1 << BBR_SCALE) 330 331 #define BBR_NUM_RTTS_FOR_DEL_LIMIT 8 /* How many pkt-rtts do we keep 332 * Delivery rate for */ 333 #define BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT 10 /* How many pkt-rtts do we keep 334 * Delivery rate for google */ 335 336 #define BBR_SECONDS_NO_RTT 10 /* 10 seconds with no RTT shrinkage */ 337 #define BBR_PROBERTT_MAX 200 /* 200ms */ 338 #define BBR_PROBERTT_NUM_MSS 4 339 #define BBR_STARTUP_EPOCHS 3 340 #define USECS_IN_MSEC 1000 341 #define BBR_TIME_TO_SECONDS(a) (a / USECS_IN_SECOND) 342 #define BBR_TIME_TO_MILLI(a) (a / MS_IN_USEC) 343 344 /* BBR keeps time in usec's so we divide by 1000 and round up */ 345 #define BBR_TS_TO_MS(t) ((t+999)/MS_IN_USEC) 346 347 /* 348 * Locking for the rack control block. 349 * a) Locked by INP_WLOCK 350 */ 351 #define BBR_STATE_STARTUP 0x01 352 #define BBR_STATE_DRAIN 0x02 353 #define BBR_STATE_PROBE_BW 0x03 354 #define BBR_STATE_PROBE_RTT 0x04 355 #define BBR_STATE_IDLE_EXIT 0x05 356 357 /* Substate defines for STATE == PROBE_BW */ 358 #define BBR_SUB_GAIN 0 /* State 0 where we are 5/4 BBR_UNIT */ 359 #define BBR_SUB_DRAIN 1 /* State 1 where we are at 3/4 BBR_UNIT */ 360 #define BBR_SUB_LEVEL1 2 /* State 1 first BBR_UNIT */ 361 #define BBR_SUB_LEVEL2 3 /* State 2nd BBR_UNIT */ 362 #define BBR_SUB_LEVEL3 4 /* State 3rd BBR_UNIT */ 363 #define BBR_SUB_LEVEL4 5 /* State 4th BBR_UNIT */ 364 #define BBR_SUB_LEVEL5 6 /* State 5th BBR_UNIT */ 365 #define BBR_SUB_LEVEL6 7 /* State last BBR_UNIT */ 366 #define BBR_SUBSTATE_COUNT 8 367 368 /* Single remaining reduce log */ 369 #define BBR_REDUCE_AT_FR 5 370 371 #define BBR_BIG_LOG_SIZE 300000 372 373 struct bbr_stats { 374 uint64_t bbr_badfr; /* 0 */ 375 uint64_t bbr_badfr_bytes; /* 1 */ 376 uint64_t bbr_saw_oerr; /* 2 */ 377 uint64_t bbr_saw_emsgsiz; /* 3 */ 378 uint64_t bbr_reorder_seen; /* 4 */ 379 uint64_t bbr_tlp_tot; /* 5 */ 380 uint64_t bbr_tlp_newdata; /* 6 */ 381 uint64_t bbr_offset_recovery; /* 7 */ 382 uint64_t bbr_tlp_retran_fail; /* 8 */ 383 uint64_t bbr_to_tot; /* 9 */ 384 uint64_t bbr_to_arm_rack; /* 10 */ 385 uint64_t bbr_enter_probertt; /* 11 */ 386 uint64_t bbr_tlp_set; /* 12 */ 387 uint64_t bbr_resends_set; /* 13 */ 388 uint64_t bbr_force_output; /* 14 */ 389 uint64_t bbr_to_arm_tlp; /* 15 */ 390 uint64_t bbr_paced_segments; /* 16 */ 391 uint64_t bbr_saw_enobuf; /* 17 */ 392 uint64_t bbr_to_alloc_failed; /* 18 */ 393 uint64_t bbr_to_alloc_emerg; /* 19 */ 394 uint64_t bbr_sack_proc_all; /* 20 */ 395 uint64_t bbr_sack_proc_short; /* 21 */ 396 uint64_t bbr_sack_proc_restart; /* 22 */ 397 uint64_t bbr_to_alloc; /* 23 */ 398 uint64_t bbr_offset_drop; /* 24 */ 399 uint64_t bbr_runt_sacks; /* 25 */ 400 uint64_t bbr_sack_passed; /* 26 */ 401 uint64_t bbr_rlock_left_ret0; /* 27 */ 402 uint64_t bbr_rlock_left_ret1; /* 28 */ 403 uint64_t bbr_dynamic_rwnd; /* 29 */ 404 uint64_t bbr_static_rwnd; /* 30 */ 405 uint64_t bbr_sack_blocks; /* 31 */ 406 uint64_t bbr_sack_blocks_skip; /* 32 */ 407 uint64_t bbr_sack_search_both; /* 33 */ 408 uint64_t bbr_sack_search_fwd; /* 34 */ 409 uint64_t bbr_sack_search_back; /* 35 */ 410 uint64_t bbr_plain_acks; /* 36 */ 411 uint64_t bbr_acks_with_sacks; /* 37 */ 412 uint64_t bbr_progress_drops; /* 38 */ 413 uint64_t bbr_early; /* 39 */ 414 uint64_t bbr_reneges_seen; /* 40 */ 415 uint64_t bbr_persist_reneg; /* 41 */ 416 uint64_t bbr_dropped_af_data; /* 42 */ 417 uint64_t bbr_failed_mbuf_aloc; /* 43 */ 418 uint64_t bbr_cwnd_limited; /* 44 */ 419 uint64_t bbr_rwnd_limited; /* 45 */ 420 uint64_t bbr_app_limited; /* 46 */ 421 uint64_t bbr_force_timer_start; /* 47 */ 422 uint64_t bbr_hpts_min_time; /* 48 */ 423 uint64_t bbr_meets_tso_thresh; /* 49 */ 424 uint64_t bbr_miss_tso_rwnd; /* 50 */ 425 uint64_t bbr_miss_tso_cwnd; /* 51 */ 426 uint64_t bbr_miss_tso_app; /* 52 */ 427 uint64_t bbr_miss_retran; /* 53 */ 428 uint64_t bbr_miss_tlp; /* 54 */ 429 uint64_t bbr_miss_unknown; /* 55 */ 430 uint64_t bbr_hdwr_rl_add_ok; /* 56 */ 431 uint64_t bbr_hdwr_rl_add_fail; /* 57 */ 432 uint64_t bbr_hdwr_rl_mod_ok; /* 58 */ 433 uint64_t bbr_hdwr_rl_mod_fail; /* 59 */ 434 uint64_t bbr_collapsed_win; /* 60 */ 435 uint64_t bbr_alloc_limited; /* 61 */ 436 uint64_t bbr_alloc_limited_conns; /* 62 */ 437 uint64_t bbr_split_limited; /* 63 */ 438 }; 439 440 /* 441 * The structure bbr_opt_stats is a simple 442 * way to see how many options are being 443 * changed in the stack. 444 */ 445 struct bbr_opts_stats { 446 uint64_t tcp_bbr_pace_per_sec; 447 uint64_t tcp_bbr_pace_del_tar; 448 uint64_t tcp_bbr_pace_seg_max; 449 uint64_t tcp_bbr_pace_seg_min; 450 uint64_t tcp_bbr_pace_cross; 451 uint64_t tcp_bbr_drain_inc_extra; 452 uint64_t tcp_bbr_unlimited; 453 uint64_t tcp_bbr_iwintso; 454 uint64_t tcp_bbr_rec_over_hpts; 455 uint64_t tcp_bbr_recforce; 456 uint64_t tcp_bbr_startup_pg; 457 uint64_t tcp_bbr_drain_pg; 458 uint64_t tcp_bbr_rwnd_is_app; 459 uint64_t tcp_bbr_probe_rtt_int; 460 uint64_t tcp_bbr_one_retran; 461 uint64_t tcp_bbr_startup_loss_exit; 462 uint64_t tcp_bbr_use_lowgain; 463 uint64_t tcp_bbr_lowgain_thresh; 464 uint64_t tcp_bbr_lowgain_half; 465 uint64_t tcp_bbr_lowgain_fd; 466 uint64_t tcp_bbr_usedel_rate; 467 uint64_t tcp_bbr_min_rto; 468 uint64_t tcp_bbr_max_rto; 469 uint64_t tcp_rack_pace_max_seg; 470 uint64_t tcp_rack_min_to; 471 uint64_t tcp_rack_reord_thresh; 472 uint64_t tcp_rack_reord_fade; 473 uint64_t tcp_rack_tlp_thresh; 474 uint64_t tcp_rack_pkt_delay; 475 uint64_t tcp_bbr_startup_exit_epoch; 476 uint64_t tcp_bbr_ack_comp_alg; 477 uint64_t tcp_rack_cheat; 478 uint64_t tcp_iwnd_tso; 479 uint64_t tcp_utter_max_tso; 480 uint64_t tcp_hdwr_pacing; 481 uint64_t tcp_extra_state; 482 uint64_t tcp_floor_min_tso; 483 /* New */ 484 uint64_t tcp_bbr_algorithm; 485 uint64_t tcp_bbr_tslimits; 486 uint64_t tcp_bbr_probertt_len; 487 uint64_t tcp_bbr_probertt_gain; 488 uint64_t tcp_bbr_topaceout; 489 uint64_t tcp_use_rackcheat; 490 uint64_t tcp_delack; 491 uint64_t tcp_maxpeak; 492 uint64_t tcp_retran_wtso; 493 uint64_t tcp_data_ac; 494 uint64_t tcp_ts_raises; 495 uint64_t tcp_pacing_oh_tmr; 496 uint64_t tcp_pacing_oh; 497 uint64_t tcp_policer_det; 498 }; 499 500 #ifdef _KERNEL 501 #define BBR_STAT_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) 502 extern counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; 503 #define BBR_STAT_ADD(name, amm) counter_u64_add(bbr_stat_arry[(offsetof(struct bbr_stats, name)/sizeof(uint64_t))], (amm)) 504 #define BBR_STAT_INC(name) BBR_STAT_ADD(name, 1) 505 #define BBR_OPTS_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) 506 extern counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; 507 #define BBR_OPTS_ADD(name, amm) counter_u64_add(bbr_opts_arry[(offsetof(struct bbr_opts_stats, name)/sizeof(uint64_t))], (amm)) 508 #define BBR_OPTS_INC(name) BBR_OPTS_ADD(name, 1) 509 #endif 510 511 #define BBR_NUM_LOSS_RATES 3 512 #define BBR_NUM_BW_RATES 3 513 514 #define BBR_RECOVERY_LOWRTT 1 515 #define BBR_RECOVERY_MEDRTT 2 516 #define BBR_RECOVERY_HIGHRTT 3 517 #define BBR_RECOVERY_EXTREMERTT 4 518 519 struct bbr_control { 520 /*******************************/ 521 /* Cache line 2 from bbr start */ 522 /*******************************/ 523 struct bbr_head rc_map; /* List of all segments Lock(a) */ 524 struct bbr_head rc_tmap; /* List in transmit order Lock(a) */ 525 struct bbr_sendmap *rc_resend; /* something we have been asked to 526 * resend */ 527 uint32_t rc_last_delay_val; /* How much we expect to delay Lock(a) */ 528 uint32_t rc_bbr_hptsi_gain:16, /* Current hptsi gain Lock(a) */ 529 rc_hpts_flags:16; /* flags on whats on the pacer wheel */ 530 531 uint32_t rc_delivered; /* BRR delivered amount Lock(a) */ 532 uint32_t rc_hptsi_agg_delay; /* How much time are we behind */ 533 534 uint32_t rc_flight_at_input; 535 uint32_t rc_lost_bytes; /* Total bytes currently marked lost */ 536 /*******************************/ 537 /* Cache line 3 from bbr start */ 538 /*******************************/ 539 struct time_filter rc_delrate; 540 /*******************************/ 541 /* Cache line 4 from bbr start */ 542 /*******************************/ 543 struct bbr_head rc_free; /* List of Free map entries Lock(a) */ 544 struct bbr_sendmap *rc_tlp_send; /* something we have been 545 * asked to resend */ 546 uint32_t rc_del_time; 547 uint32_t rc_target_at_state; /* Target for a state */ 548 549 uint16_t rc_free_cnt; /* Number of free entries on the rc_free list 550 * Lock(a) */ 551 uint16_t rc_startup_pg; 552 553 uint32_t cur_rtt; /* Last RTT from ack */ 554 555 uint32_t rc_went_idle_time; /* Used for persits to see if its 556 * probe-rtt qualified */ 557 uint32_t rc_pace_max_segs:17, /* How much in any single TSO we send Lock(a) */ 558 rc_pace_min_segs:15; /* The minimum single segment size before we enter persists */ 559 560 uint32_t rc_rtt_shrinks; /* Time of last rtt shrinkage Lock(a) */ 561 uint32_t r_app_limited_until; 562 uint32_t rc_timer_exp; /* If a timer ticks of expiry */ 563 uint32_t rc_rcv_epoch_start; /* Start time of the Epoch Lock(a) */ 564 565 /*******************************/ 566 /* Cache line 5 from bbr start */ 567 /*******************************/ 568 569 uint32_t rc_lost_at_pktepoch; /* what the lost value was at the last 570 * pkt-epoch */ 571 uint32_t r_measurement_count; /* count of measurement applied lock(a) */ 572 573 uint32_t rc_last_tlp_seq; /* Last tlp sequence Lock(a) */ 574 uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ 575 uint16_t rc_pkt_delay; /* Socket option value Lock(a) */ 576 577 struct bbr_sendmap *rc_sacklast; /* sack remembered place 578 * Lock(a) */ 579 struct bbr_sendmap *rc_next; /* remembered place where we next 580 * retransmit at Lock(a) */ 581 582 uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ 583 uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ 584 585 uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ 586 uint32_t rc_init_rwnd; /* Initial rwnd when we transitioned */ 587 /*- --- 588 * used only initial and close 589 */ 590 uint32_t rc_high_rwnd; /* Highest rwnd seen */ 591 uint32_t rc_lowest_rtt; /* Smallest RTT we have seen */ 592 593 uint32_t rc_last_rtt; /* Last valid measured RTT that ack'd data */ 594 uint32_t bbr_cross_over; 595 596 /*******************************/ 597 /* Cache line 6 from bbr start */ 598 /*******************************/ 599 struct sack_filter bbr_sf; 600 601 /*******************************/ 602 /* Cache line 7 from bbr start */ 603 /*******************************/ 604 struct time_filter_small rc_rttprop; 605 uint32_t last_inbound_ts; /* Peers last timestamp */ 606 607 uint32_t rc_inc_tcp_oh: 1, 608 rc_inc_ip_oh: 1, 609 rc_inc_enet_oh:1, 610 rc_incr_tmrs:1, 611 restrict_growth:28; 612 uint32_t rc_lt_epoch_use; /* When we started lt-bw use Lock(a) */ 613 614 uint32_t rc_recovery_start; /* Time we start recovery Lock(a) */ 615 uint32_t rc_lt_del; /* Delivered at lt bw sampling start Lock(a) */ 616 617 uint64_t rc_bbr_cur_del_rate; /* Current measured delivery rate 618 * Lock(a) */ 619 620 /*******************************/ 621 /* Cache line 8 from bbr start */ 622 /*******************************/ 623 uint32_t rc_cwnd_on_ent; /* On entry to recovery the cwnd 624 * Lock(a) */ 625 uint32_t rc_agg_early; /* aggregate amount early */ 626 627 uint32_t rc_rcvtime; /* When we last received data Lock(a) */ 628 uint32_t rc_pkt_epoch_del; /* seq num that we need for RTT epoch */ 629 630 uint32_t rc_pkt_epoch; /* Epoch based on packet RTTs */ 631 uint32_t rc_pkt_epoch_time; /* Time we started the pkt epoch */ 632 633 uint32_t rc_pkt_epoch_rtt; /* RTT using the packet epoch */ 634 uint32_t rc_rtt_epoch; /* Current RTT epoch, it ticks every rttProp 635 * Lock(a) */ 636 uint32_t lowest_rtt; 637 uint32_t bbr_smallest_srtt_this_state; 638 639 uint32_t rc_lt_epoch; /* LT epoch start of bw_sampling */ 640 uint32_t rc_lost_at_startup; 641 642 uint32_t rc_bbr_state_atflight; 643 uint32_t rc_bbr_last_startup_epoch; /* Last startup epoch where we 644 * increased 20% */ 645 uint32_t rc_bbr_enters_probertt; /* Timestamp we entered 646 * probertt Lock(a) */ 647 uint32_t rc_lt_time; /* Time of lt sampling start Lock(a) */ 648 649 /*******************************/ 650 /* Cache line 9 from bbr start */ 651 /*******************************/ 652 uint64_t rc_lt_bw; /* LT bw calculated Lock(a) */ 653 uint64_t rc_bbr_lastbtlbw; /* For startup, what was last btlbw I 654 * saw to check the 20% gain Lock(a) */ 655 656 uint32_t rc_bbr_cwnd_gain; /* Current cwnd gain Lock(a) */ 657 uint32_t rc_pkt_epoch_loss_rate; /* pkt-epoch loss rate */ 658 659 uint32_t rc_saved_cwnd; /* Saved cwnd during Probe-rtt drain Lock(a) */ 660 uint32_t substate_pe; 661 662 uint32_t rc_lost; /* Number of bytes lost Lock(a) */ 663 uint32_t rc_exta_time_gd; /* How much extra time we got in d/g */ 664 665 uint32_t rc_lt_lost; /* Number of lt bytes lost at sampling start 666 * Lock(a) */ 667 uint32_t rc_bbr_state_time; 668 669 uint32_t rc_min_to; /* Socket option value Lock(a) */ 670 uint32_t rc_initial_hptsi_bw; /* Our initial startup bw Lock(a) */ 671 672 uint32_t bbr_lost_at_state; /* Temp counter debug lost value as we 673 * enter a state */ 674 /*******************************/ 675 /* Cache line 10 from bbr start */ 676 /*******************************/ 677 uint32_t rc_level_state_extra; 678 uint32_t rc_red_cwnd_pe; 679 const struct tcp_hwrate_limit_table *crte; 680 uint64_t red_bw; 681 682 uint32_t rc_probertt_int; 683 uint32_t rc_probertt_srttchktim; /* Time we last did a srtt 684 * check */ 685 uint32_t gain_epoch; /* Epoch we should be out of gain */ 686 uint32_t rc_min_rto_ms; 687 688 uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ 689 uint32_t last_startup_measure; 690 691 int32_t bbr_hptsi_per_second; 692 int32_t bbr_hptsi_segments_delay_tar; 693 694 int32_t bbr_hptsi_segments_max; 695 uint32_t bbr_rttprobe_gain_val; 696 /*******************************/ 697 /* Cache line 11 from bbr start */ 698 /*******************************/ 699 uint32_t cur_rtt_send_time; /* Time we sent our rtt measured packet */ 700 uint32_t bbr_peer_tsratio; /* Our calculated ts ratio to multply */ 701 uint32_t bbr_ts_check_tstmp; /* When we filled it the TS that came on the ack */ 702 uint32_t bbr_ts_check_our_cts; /* When we filled it the cts of the send */ 703 uint32_t rc_tlp_rxt_last_time; 704 uint32_t bbr_smallest_srtt_state2; 705 uint32_t bbr_hdwr_cnt_noset_snt; /* count of hw pacing sends during delay */ 706 uint32_t startup_last_srtt; 707 uint32_t rc_ack_hdwr_delay; 708 uint32_t highest_hdwr_delay; /* Largest delay we have seen from hardware */ 709 uint32_t non_gain_extra; 710 uint32_t recovery_lr; /* The sum of the loss rate from the pe's during recovery */ 711 uint32_t last_in_probertt; 712 uint32_t flightsize_at_drain; /* In draining what was the last marked flight size */ 713 uint32_t rc_pe_of_prtt; /* PE we went into probe-rtt */ 714 uint32_t ts_in; /* ts that went with the last rtt */ 715 716 uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent 717 * rc_last_tlp_seq Lock(a) */ 718 uint16_t rc_drain_pg; 719 uint32_t rc_num_maps_alloced; /* num send map entries allocated */ 720 uint32_t rc_num_split_allocs; /* num split map entries allocated */ 721 uint16_t rc_num_small_maps_alloced; /* Number of sack blocks 722 * allocated */ 723 uint16_t bbr_hptsi_bytes_min; 724 725 uint16_t bbr_hptsi_segments_floor; 726 uint16_t bbr_utter_max; 727 uint16_t bbr_google_discount; 728 729 }; 730 731 struct socket; 732 struct tcp_bbr { 733 /* First cache line 0x00 */ 734 int32_t(*r_substate) (struct mbuf *, struct tcphdr *, 735 struct socket *, struct tcpcb *, struct tcpopt *, 736 int32_t, int32_t, uint32_t, int32_t, int32_t, uint8_t); /* Lock(a) */ 737 struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ 738 struct inpcb *rc_inp; /* The inpcb Lock(a) */ 739 struct timeval rc_tv; 740 uint32_t rc_pacer_started; /* Time we started the pacer */ 741 uint16_t no_pacing_until:8, /* No pacing until N packet epochs */ 742 ts_can_raise:1,/* TS b/w calculations can raise the bw higher */ 743 skip_gain:1, /* Skip the gain cycle (hardware pacing) */ 744 gain_is_limited:1, /* With hardware pacing we are limiting gain */ 745 output_error_seen:1, 746 oerror_cnt:4, 747 hw_pacing_set:1; /* long enough has passed for us to start pacing */ 748 uint16_t xxx_r_ack_count; /* During recovery count of ack's received 749 * that added data since output */ 750 uint16_t bbr_segs_rcvd; /* In Segment count since we sent a ack */ 751 752 uint8_t bbr_timer_src:4, /* Used for debugging Lock(a) */ 753 bbr_use_rack_cheat:1, /* Use the rack cheat */ 754 bbr_init_win_cheat:1, /* Send full IW for TSO */ 755 bbr_attempt_hdwr_pace:1,/* Try to do hardware pacing */ 756 bbr_hdrw_pacing:1; /* Hardware pacing is available */ 757 uint8_t bbr_hdw_pace_ena:1, /* Does the connection allow hardware pacing to be attempted */ 758 bbr_prev_in_rec:1, /* We were previously in recovery */ 759 pkt_conservation:1, 760 use_policer_detection:1, 761 xxx_bbr_hdw_pace_idx:4; /* If hardware pacing is on, index to slot in pace tbl */ 762 uint16_t r_wanted_output:1, 763 rtt_valid:1, 764 rc_timer_first:1, 765 rc_output_starts_timer:1, 766 rc_resends_use_tso:1, 767 rc_all_timers_stopped:1, 768 rc_loss_exit:1, 769 rc_ack_was_delayed:1, 770 rc_lt_is_sampling:1, 771 rc_filled_pipe:1, 772 rc_tlp_new_data:1, 773 rc_hit_state_1:1, 774 rc_ts_valid:1, 775 rc_prtt_set_ts:1, 776 rc_is_pkt_epoch_now:1, 777 rc_has_collapsed:1; 778 779 uint8_t r_state:4, /* Current bbr state Lock(a) */ 780 r_agg_early_set:1, /* Did we get called early */ 781 r_init_rtt:1, 782 r_use_policer:1, /* For google mode only */ 783 r_recovery_bw:1; 784 uint8_t r_timer_override:1, /* pacer override Lock(a) 0/1 */ 785 rc_in_persist:1, 786 rc_lt_use_bw:1, 787 rc_allow_data_af_clo:1, 788 rc_tlp_rtx_out:1, /* A TLP is in flight */ 789 rc_tlp_in_progress:1, /* a TLP timer is running needed? */ 790 rc_use_idle_restart:1; /* Do we restart fast after idle (persist or applim) */ 791 uint8_t rc_bbr_state:3, /* What is the major BBR state */ 792 rc_bbr_substate:3, /* For probeBW state */ 793 r_is_v6:1, 794 rc_past_init_win:1; 795 uint8_t rc_last_options; 796 uint8_t rc_tlp_threshold; /* Socket option value Lock(a) */ 797 uint8_t rc_max_rto_sec; 798 uint8_t rc_cwnd_limited:1, /* We are cwnd limited */ 799 rc_tmr_stopped:7; /* What timers have been stopped */ 800 uint8_t rc_use_google:1, 801 rc_use_ts_limit:1, 802 rc_ts_data_set:1, /* We have filled a set point to determine */ 803 rc_ts_clock_set:1, /* We have determined the ts type */ 804 rc_ts_cant_be_used:1, /* We determined we can't use ts values */ 805 rc_ack_is_cumack:1, 806 rc_no_pacing:1, 807 alloc_limit_reported:1; 808 uint8_t rc_init_win; 809 /* Cache line 2 0x40 */ 810 struct bbr_control r_ctl; 811 #ifdef _KERNEL 812 } __aligned(CACHE_LINE_SIZE); 813 #else 814 }; 815 #endif 816 817 #endif 818