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 * $FreeBSD$ 26 */ 27 28 #ifndef _NETINET_TCP_RACK_H_ 29 #define _NETINET_TCP_RACK_H_ 30 31 #define RACK_ACKED 0x000001/* The remote endpoint acked this */ 32 #define RACK_TO_REXT 0x000002/* A timeout occurred on this sendmap entry */ 33 #define RACK_DEFERRED 0x000004/* We can't use this for RTT calc - not used */ 34 #define RACK_OVERMAX 0x000008/* We have more retran's then we can fit */ 35 #define RACK_SACK_PASSED 0x000010/* A sack was done above this block */ 36 #define RACK_WAS_SACKPASS 0x000020/* We retransmitted due to SACK pass */ 37 #define RACK_HAS_FIN 0x000040/* segment is sent with fin */ 38 #define RACK_TLP 0x000080/* segment sent as tail-loss-probe */ 39 #define RACK_RWND_COLLAPSED 0x000100/* The peer collapsed the rwnd on the segment */ 40 #define RACK_APP_LIMITED 0x000200/* We went app limited after this send */ 41 #define RACK_WAS_ACKED 0x000400/* a RTO undid the ack, but it already had a rtt calc done */ 42 #define RACK_HAS_SYN 0x000800/* SYN is on this guy */ 43 #define RACK_SENT_W_DSACK 0x001000/* Sent with a dsack */ 44 #define RACK_SENT_SP 0x002000/* sent in slow path */ 45 #define RACK_SENT_FP 0x004000/* sent in fast path */ 46 #define RACK_HAD_PUSH 0x008000/* Push was sent on original send */ 47 #define RACK_MUST_RXT 0x010000/* We must retransmit this rsm (non-sack/mtu chg)*/ 48 #define RACK_IN_GP_WIN 0x020000/* Send was in GP window when sent */ 49 #define RACK_SHUFFLED 0x040000/* The RSM was shuffled some data from one to another */ 50 #define RACK_MERGED 0x080000/* The RSM was merged */ 51 #define RACK_PMTU_CHG 0x100000/* The path mtu changed on this guy */ 52 #define RACK_STRADDLE 0x200000/* The seq straddles the bucket line */ 53 #define RACK_NUM_OF_RETRANS 3 54 55 #define RACK_INITIAL_RTO 1000000 /* 1 second in microseconds */ 56 57 #define RACK_REQ_AVG 3 /* Must be less than 256 */ 58 59 struct rack_sendmap { 60 TAILQ_ENTRY(rack_sendmap) next; 61 TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */ 62 uint32_t bindex; 63 uint32_t r_start; /* Sequence number of the segment */ 64 uint32_t r_end; /* End seq, this is 1 beyond actually */ 65 uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ 66 uint32_t r_flags : 24, /* Flags as defined above */ 67 r_rtr_cnt : 8; /* Retran count, index this -1 to get time */ 68 struct mbuf *m; 69 uint32_t soff; 70 uint32_t orig_m_len; /* The original mbuf len when we sent (can update) */ 71 uint32_t orig_t_space; /* The original trailing space when we sent (can update) */ 72 uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */ 73 uint8_t r_dupack; /* Dup ack count */ 74 uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */ 75 uint8_t r_limit_type; /* is this entry counted against a limit? */ 76 uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */ 77 r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */ 78 r_no_rtt_allowed : 1, /* No rtt measurement allowed */ 79 r_hw_tls : 1, 80 r_avail : 4; 81 uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; 82 uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */ 83 uint32_t r_fas; /* Flight at send */ 84 uint8_t r_bas; /* The burst size (burst at send = bas) */ 85 }; 86 87 struct deferred_opt_list { 88 TAILQ_ENTRY(deferred_opt_list) next; 89 int optname; 90 uint64_t optval; 91 }; 92 93 /* 94 * Timestamps in the rack sendmap are now moving to be 95 * uint64_t's. This means that if you want a uint32_t 96 * usec timestamp (the old usecond timestamp) you simply have 97 * to cast it to uint32_t. The reason we do this is not for 98 * wrap, but we need to get back, at times, to the millisecond 99 * timestamp that is used in the TSTMP option. To do this we 100 * can use the rack_ts_to_msec() inline below which can take 101 * the 64bit ts and make into the correct timestamp millisecond 102 * wise. Thats not possible with the 32bit usecond timestamp since 103 * the seconds wrap too quickly to cover all bases. 104 * 105 * There are quite a few places in rack where I simply cast 106 * back to uint32_t and then end up using the TSTMP_XX() 107 * macros. This is ok, but we could do simple compares if 108 * we ever decided to move all of those variables to 64 bits 109 * as well. 110 */ 111 112 inline uint64_t 113 rack_to_usec_ts(struct timeval *tv) 114 { 115 return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec); 116 } 117 118 inline uint32_t 119 rack_ts_to_msec(uint64_t ts) 120 { 121 return((uint32_t)(ts / HPTS_MSEC_IN_SEC)); 122 } 123 124 125 RB_HEAD(rack_rb_tree_head, rack_sendmap); 126 TAILQ_HEAD(rack_head, rack_sendmap); 127 TAILQ_HEAD(def_opt_head, deferred_opt_list); 128 129 /* Map change logging */ 130 #define MAP_MERGE 0x01 131 #define MAP_SPLIT 0x02 132 #define MAP_NEW 0x03 133 #define MAP_SACK_M1 0x04 134 #define MAP_SACK_M2 0x05 135 #define MAP_SACK_M3 0x06 136 #define MAP_SACK_M4 0x07 137 #define MAP_SACK_M5 0x08 138 #define MAP_FREE 0x09 139 #define MAP_TRIM_HEAD 0x0a 140 141 #define RACK_LIMIT_TYPE_SPLIT 1 142 143 /* 144 * We use the rate sample structure to 145 * assist in single sack/ack rate and rtt 146 * calculation. In the future we will expand 147 * this in BBR to do forward rate sample 148 * b/w estimation. 149 */ 150 #define RACK_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ 151 #define RACK_RTT_VALID 0x00000002 /* We have at least one valid RTT */ 152 struct rack_rtt_sample { 153 uint32_t rs_flags; 154 uint32_t rs_rtt_lowest; 155 uint32_t rs_rtt_highest; 156 uint32_t rs_rtt_cnt; 157 uint32_t rs_us_rtt; 158 int32_t confidence; 159 uint64_t rs_rtt_tot; 160 uint16_t rs_us_rtrcnt; 161 }; 162 163 #define RACK_LOG_TYPE_ACK 0x01 164 #define RACK_LOG_TYPE_OUT 0x02 165 #define RACK_LOG_TYPE_TO 0x03 166 #define RACK_LOG_TYPE_ALLOC 0x04 167 #define RACK_LOG_TYPE_FREE 0x05 168 169 /* 170 * Magic numbers for logging timeout events if the 171 * logging is enabled. 172 */ 173 #define RACK_TO_FRM_TMR 1 174 #define RACK_TO_FRM_TLP 2 175 #define RACK_TO_FRM_RACK 3 176 #define RACK_TO_FRM_KEEP 4 177 #define RACK_TO_FRM_PERSIST 5 178 #define RACK_TO_FRM_DELACK 6 179 180 struct rack_opts_stats { 181 uint64_t tcp_rack_tlp_reduce; 182 uint64_t tcp_rack_pace_always; 183 uint64_t tcp_rack_pace_reduce; 184 uint64_t tcp_rack_max_seg; 185 uint64_t tcp_rack_prr_sendalot; 186 uint64_t tcp_rack_min_to; 187 uint64_t tcp_rack_early_seg; 188 uint64_t tcp_rack_reord_thresh; 189 uint64_t tcp_rack_reord_fade; 190 uint64_t tcp_rack_tlp_thresh; 191 uint64_t tcp_rack_pkt_delay; 192 uint64_t tcp_rack_tlp_inc_var; 193 uint64_t tcp_tlp_use; 194 uint64_t tcp_rack_idle_reduce; 195 uint64_t tcp_rack_idle_reduce_high; 196 uint64_t rack_no_timer_in_hpts; 197 uint64_t tcp_rack_min_pace_seg; 198 uint64_t tcp_rack_pace_rate_ca; 199 uint64_t tcp_rack_rr; 200 uint64_t tcp_rack_do_detection; 201 uint64_t tcp_rack_rrr_no_conf_rate; 202 uint64_t tcp_initial_rate; 203 uint64_t tcp_initial_win; 204 uint64_t tcp_hdwr_pacing; 205 uint64_t tcp_gp_inc_ss; 206 uint64_t tcp_gp_inc_ca; 207 uint64_t tcp_gp_inc_rec; 208 uint64_t tcp_rack_force_max_seg; 209 uint64_t tcp_rack_pace_rate_ss; 210 uint64_t tcp_rack_pace_rate_rec; 211 /* Temp counters for dsack */ 212 uint64_t tcp_sack_path_1; /* not used */ 213 uint64_t tcp_sack_path_2a; /* not used */ 214 uint64_t tcp_sack_path_2b; /* not used */ 215 uint64_t tcp_sack_path_3; /* not used */ 216 uint64_t tcp_sack_path_4; /* not used */ 217 /* non temp counters */ 218 uint64_t tcp_rack_scwnd; 219 uint64_t tcp_rack_noprr; 220 uint64_t tcp_rack_cfg_rate; 221 uint64_t tcp_timely_dyn; 222 uint64_t tcp_rack_mbufq; 223 uint64_t tcp_fillcw; 224 uint64_t tcp_npush; 225 uint64_t tcp_lscwnd; 226 uint64_t tcp_profile; 227 uint64_t tcp_hdwr_rate_cap; 228 uint64_t tcp_pacing_rate_cap; 229 uint64_t tcp_pacing_up_only; 230 uint64_t tcp_use_cmp_acks; 231 uint64_t tcp_rack_abc_val; 232 uint64_t tcp_rec_abc_val; 233 uint64_t tcp_rack_measure_cnt; 234 uint64_t tcp_rack_delayed_ack; 235 uint64_t tcp_rack_rtt_use; 236 uint64_t tcp_data_after_close; 237 uint64_t tcp_defer_opt; 238 uint64_t tcp_rxt_clamp; 239 uint64_t tcp_rack_beta; 240 uint64_t tcp_rack_beta_ecn; 241 uint64_t tcp_rack_timer_slop; 242 uint64_t tcp_rack_dsack_opt; 243 uint64_t tcp_rack_hi_beta; 244 uint64_t tcp_split_limit; 245 uint64_t tcp_rack_pacing_divisor; 246 uint64_t tcp_rack_min_seg; 247 uint64_t tcp_dgp_in_rec; 248 }; 249 250 /* RTT shrink reasons */ 251 #define RACK_RTTS_INIT 0 252 #define RACK_RTTS_NEWRTT 1 253 #define RACK_RTTS_EXITPROBE 2 254 #define RACK_RTTS_ENTERPROBE 3 255 #define RACK_RTTS_REACHTARGET 4 256 #define RACK_RTTS_SEEHBP 5 257 #define RACK_RTTS_NOBACKOFF 6 258 #define RACK_RTTS_SAFETY 7 259 260 #define RACK_USE_BEG 1 261 #define RACK_USE_END 2 262 #define RACK_USE_END_OR_THACK 3 263 264 #define TLP_USE_ID 1 /* Internet draft behavior */ 265 #define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */ 266 #define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */ 267 #define RACK_MIN_BW 8000 /* 64kbps in Bps */ 268 269 /* Rack quality indicators for GPUT measurements */ 270 #define RACK_QUALITY_NONE 0 /* No quality stated */ 271 #define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */ 272 #define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */ 273 #define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */ 274 #define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */ 275 #define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */ 276 277 #define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */ 278 #ifdef _KERNEL 279 #define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t)) 280 extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; 281 #define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm)) 282 #define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1) 283 #endif 284 /* 285 * As we get each SACK we wade through the 286 * rc_map and mark off what is acked. 287 * We also increment rc_sacked as well. 288 * 289 * We also pay attention to missing entries 290 * based on the time and possibly mark them 291 * for retransmit. If we do and we are not already 292 * in recovery we enter recovery. In doing 293 * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. 294 * We also setup rc_next/rc_snd_nxt/rc_send_end so 295 * we will know where to send from. When not in 296 * recovery rc_next will be NULL and rc_snd_nxt should 297 * equal snd_max. 298 * 299 * Whenever we retransmit from recovery we increment 300 * rc_holes_rxt as we retran a block and mark it as retransmitted 301 * with the time it was sent. During non-recovery sending we 302 * add to our map and note the time down of any send expanding 303 * the rc_map at the tail and moving rc_snd_nxt up with snd_max. 304 * 305 * In recovery during SACK/ACK processing if a chunk has 306 * been retransmitted and it is now acked, we decrement rc_holes_rxt. 307 * When we retransmit from the scoreboard we use 308 * rc_next and rc_snd_nxt/rc_send_end to help us 309 * find what needs to be retran. 310 * 311 * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt 312 * This gets us the effect of RFC6675 pipe, counting twice for 313 * bytes retransmitted. 314 */ 315 316 #define TT_RACK_FR_TMR 0x2000 317 318 /* 319 * Locking for the rack control block. 320 * a) Locked by INP_WLOCK 321 * b) Locked by the hpts-mutex 322 * 323 */ 324 #define RACK_GP_HIST 4 /* How much goodput history do we maintain? */ 325 326 #define RACK_NUM_FSB_DEBUG 16 327 #ifdef _KERNEL 328 struct rack_fast_send_blk { 329 uint32_t left_to_send; 330 uint16_t tcp_ip_hdr_len; 331 uint8_t tcp_flags; 332 uint8_t hoplimit; 333 uint8_t *tcp_ip_hdr; 334 uint32_t recwin; 335 uint32_t off; 336 struct tcphdr *th; 337 struct udphdr *udp; 338 struct mbuf *m; 339 uint32_t o_m_len; 340 uint32_t o_t_len; 341 uint32_t rfo_apply_push : 1, 342 hw_tls : 1, 343 unused : 30; 344 }; 345 346 struct tailq_hash; 347 348 struct rack_control { 349 /* Second cache line 0x40 from tcp_rack */ 350 struct tailq_hash *tqh; /* Tree of all segments Lock(a) */ 351 struct rack_head rc_tmap; /* List in transmit order Lock(a) */ 352 struct rack_sendmap *rc_tlpsend; /* Remembered place for 353 * tlp_sending Lock(a) */ 354 struct rack_sendmap *rc_resend; /* something we have been asked to 355 * resend */ 356 struct rack_fast_send_blk fsb; /* The fast-send block */ 357 uint32_t timer_slop; 358 uint16_t pace_len_divisor; 359 uint16_t rc_user_set_min_segs; 360 uint32_t rc_hpts_flags; 361 uint32_t rc_fixed_pacing_rate_ca; 362 uint32_t rc_fixed_pacing_rate_rec; 363 uint32_t rc_fixed_pacing_rate_ss; 364 uint32_t cwnd_to_use; /* The cwnd in use */ 365 uint32_t rc_timer_exp; /* If a timer ticks of expiry */ 366 uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */ 367 uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */ 368 369 /* Third Cache line 0x80 */ 370 struct rack_head rc_free; /* Allocation array */ 371 uint64_t last_hw_bw_req; 372 uint64_t crte_prev_rate; 373 uint64_t bw_rate_cap; 374 uint64_t last_cumack_advance; /* Last time cumack moved forward */ 375 uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ 376 377 uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP 378 * Lock(a) */ 379 uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */ 380 381 uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */ 382 383 uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */ 384 385 uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ 386 uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */ 387 388 uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */ 389 390 uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */ 391 uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */ 392 393 uint32_t rc_loss_count; /* How many bytes have been retransmitted 394 * Lock(a) */ 395 uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ 396 397 /* Forth cache line 0xc0 */ 398 /* Times */ 399 400 uint32_t rc_rack_tmit_time; /* Rack transmit time Lock(a) */ 401 uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ 402 403 uint32_t rc_num_maps_alloced; /* Number of map blocks (sacks) we 404 * have allocated */ 405 uint32_t rc_rcvtime; /* When we last received data */ 406 uint32_t rc_num_split_allocs; /* num split map entries allocated */ 407 uint32_t rc_split_limit; /* Limit from control var can be set by socket opt */ 408 409 uint32_t rc_last_output_to; 410 uint32_t rc_went_idle_time; 411 412 struct rack_sendmap *rc_sacklast; /* sack remembered place 413 * Lock(a) */ 414 415 struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */ 416 struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */ 417 /* Cache line split 0x100 */ 418 struct sack_filter rack_sf; 419 /* Cache line split 0x140 */ 420 /* Flags for various things */ 421 uint32_t rc_pace_max_segs; 422 uint32_t rc_pace_min_segs; 423 uint32_t rc_app_limited_cnt; 424 uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */ 425 uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */ 426 uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 427 uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 428 uint32_t rc_high_rwnd; 429 uint32_t ack_count; 430 uint32_t sack_count; 431 uint32_t sack_noextra_move; 432 uint32_t sack_moved_extra; 433 struct rack_rtt_sample rack_rs; 434 const struct tcp_hwrate_limit_table *crte; 435 uint32_t rc_agg_early; 436 uint32_t rc_agg_delayed; 437 uint32_t rc_tlp_rxt_last_time; 438 uint32_t rc_saved_cwnd; 439 uint64_t rc_gp_output_ts; /* chg*/ 440 uint64_t rc_gp_cumack_ts; /* chg*/ 441 struct timeval act_rcv_time; 442 struct timeval rc_last_time_decay; /* SAD time decay happened here */ 443 uint64_t gp_bw; 444 uint64_t init_rate; 445 #ifdef NETFLIX_SHARED_CWND 446 struct shared_cwnd *rc_scw; 447 #endif 448 uint64_t last_gp_comp_bw; 449 uint64_t last_max_bw; /* Our calculated max b/w last */ 450 struct time_filter_small rc_gp_min_rtt; 451 struct def_opt_head opt_list; 452 uint64_t lt_bw_time; /* Total time with data outstanding (lt_bw = long term bandwidth) */ 453 uint64_t lt_bw_bytes; /* Total bytes acked */ 454 uint64_t lt_timemark; /* 64 bit timestamp when we started sending */ 455 struct http_sendfile_track *rc_last_sft; 456 uint32_t lt_seq; /* Seq at start of lt_bw gauge */ 457 int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */ 458 uint64_t last_sndbytes; 459 uint64_t last_snd_rxt_bytes; 460 uint64_t rxt_threshold; 461 uint32_t last_rnd_rxt_clamped; 462 uint32_t num_of_clamps_applied; 463 uint32_t clamp_options; 464 uint32_t max_clamps; 465 466 uint32_t rc_gp_srtt; /* Current GP srtt */ 467 uint32_t rc_prev_gp_srtt; /* Previous RTT */ 468 uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */ 469 uint32_t rc_loss_at_start; /* At measurement window where was our lost value */ 470 471 uint32_t dsack_round_end; /* In a round of seeing a DSACK */ 472 uint32_t current_round; /* Starting at zero */ 473 uint32_t roundends; /* acked value above which round ends */ 474 uint32_t num_dsack; /* Count of dsack's seen (1 per window)*/ 475 uint32_t forced_ack_ts; 476 uint32_t last_collapse_point; /* Last point peer collapsed too */ 477 uint32_t high_collapse_point; 478 uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */ 479 uint32_t rc_time_probertt_entered; 480 uint32_t rc_time_probertt_starts; 481 uint32_t rc_lowest_us_rtt; 482 uint32_t rc_highest_us_rtt; 483 uint32_t rc_last_us_rtt; 484 uint32_t rc_time_of_last_probertt; 485 uint32_t rc_target_probertt_flight; 486 uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */ 487 uint32_t rc_cwnd_at_erec; 488 uint32_t rc_ssthresh_at_erec; 489 uint32_t dsack_byte_cnt; 490 uint32_t retran_during_recovery; 491 uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */ 492 uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */ 493 uint32_t rc_snd_max_at_rto; /* For non-sack when the RTO occurred what was snd-max */ 494 uint32_t rc_out_at_rto; 495 int32_t rc_scw_index; 496 uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */ 497 uint32_t rc_last_timeout_snduna; 498 uint32_t last_tlp_acked_start; 499 uint32_t last_tlp_acked_end; 500 uint32_t challenge_ack_ts; 501 uint32_t challenge_ack_cnt; 502 uint32_t rc_min_to; /* Socket option value Lock(a) */ 503 uint32_t rc_pkt_delay; /* Socket option value Lock(a) */ 504 uint32_t persist_lost_ends; 505 uint32_t ack_during_sd; 506 uint32_t input_pkt; 507 uint32_t saved_input_pkt; 508 uint32_t saved_rxt_clamp_val; /* The encoded value we used to setup clamping */ 509 struct newreno rc_saved_beta; /* 510 * For newreno cc: 511 * rc_saved_cc are the values we have had 512 * set by the user, if pacing is not happening 513 * (i.e. its early and we have not turned on yet 514 * or it was turned off). The minute pacing 515 * is turned on we pull out the values currently 516 * being used by newreno and replace them with 517 * these values, then save off the old values here, 518 * we also set the flag (if ecn_beta is set) to make 519 * new_reno do less of a backoff for ecn (think abe). 520 */ 521 uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */ 522 uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ 523 uint8_t rack_per_upper_bound_ss; 524 uint8_t rack_per_upper_bound_ca; 525 uint8_t dsack_persist; 526 uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */ 527 uint8_t num_measurements; /* Number of measurements (up to 0xff, we freeze at 0xff) */ 528 uint8_t req_measurements; /* How many measurements are required? */ 529 uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */ 530 uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */ 531 uint8_t rc_rate_sample_method; 532 uint8_t rc_dgp_bl_agg; /* Buffer Level aggression during DGP */ 533 uint8_t full_dgp_in_rec; /* Flag to say if we do full DGP in recovery */ 534 uint8_t client_suggested_maxseg; /* Not sure what to do with this yet */ 535 uint8_t pacing_discount_amm; /* 536 * This is a multipler to the base discount that 537 * can be used to increase the discount. 538 */ 539 uint8_t already_had_a_excess; 540 }; 541 #endif 542 543 /* DGP with no buffer level mitigations */ 544 #define DGP_LEVEL0 0 545 546 /* 547 * DGP with buffer level mitigation where BL:4 caps fillcw and BL:5 548 * turns off fillcw. 549 */ 550 #define DGP_LEVEL1 1 551 552 /* 553 * DGP with buffer level mitigation where BL:3 caps fillcw and BL:4 turns off fillcw 554 * and BL:5 reduces by 10% 555 */ 556 #define DGP_LEVEL2 2 557 558 /* 559 * DGP with buffer level mitigation where BL:2 caps fillcw and BL:3 turns off 560 * fillcw BL:4 reduces by 10% and BL:5 reduces by 20% 561 */ 562 #define DGP_LEVEL3 3 563 564 /* Hybrid pacing log defines */ 565 #define HYBRID_LOG_NO_ROOM 0 /* No room for the clients request */ 566 #define HYBRID_LOG_TURNED_OFF 1 /* Turned off hybrid pacing */ 567 #define HYBRID_LOG_NO_PACING 2 /* Failed to set pacing on */ 568 #define HYBRID_LOG_RULES_SET 3 /* Hybrid pacing for this chunk is set */ 569 #define HYBRID_LOG_NO_RANGE 4 /* In DGP mode, no range found */ 570 #define HYBRID_LOG_RULES_APP 5 /* The specified rules were applied */ 571 #define HYBRID_LOG_REQ_COMP 6 /* The request completed */ 572 #define HYBRID_LOG_BW_MEASURE 7 /* Follow up b/w measurements to the previous completed log */ 573 #define HYBRID_LOG_RATE_CAP 8 /* We had a rate cap apply */ 574 #define HYBRID_LOG_CAP_CALC 9 /* How we calculate the cap */ 575 #define HYBRID_LOG_ISSAME 10 /* Same as before -- temp */ 576 #define HYBRID_LOG_ALLSENT 11 /* We sent it all no more rate-cap */ 577 #define HYBRID_LOG_OUTOFTIME 12 /* We are past the deadline DGP */ 578 #define HYBRID_LOG_CAPERROR 13 /* Hit one of the TSNH cases */ 579 #define HYBRID_LOG_EXTEND 14 /* We extended the end */ 580 581 #define RACK_TIMELY_CNT_BOOST 5 /* At 5th increase boost */ 582 #define RACK_MINRTT_FILTER_TIM 10 /* Seconds */ 583 584 #define RACK_HYSTART_OFF 0 585 #define RACK_HYSTART_ON 1 /* hystart++ on */ 586 #define RACK_HYSTART_ON_W_SC 2 /* hystart++ on +Slam Cwnd */ 587 #define RACK_HYSTART_ON_W_SC_C 3 /* hystart++ on, 588 * Conservative ssthresh and 589 * +Slam cwnd 590 */ 591 592 #ifdef _KERNEL 593 594 struct tcp_rack { 595 /* First cache line 0x00 */ 596 TAILQ_ENTRY(tcp_rack) r_hpts; /* hptsi queue next Lock(b) */ 597 int32_t(*r_substate) (struct mbuf *, struct tcphdr *, 598 struct socket *, struct tcpcb *, struct tcpopt *, 599 int32_t, int32_t, uint32_t, int, int, uint8_t); /* Lock(a) */ 600 struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ 601 struct inpcb *rc_inp; /* The inpcb Lock(a) */ 602 uint8_t rc_free_cnt; /* Number of free entries on the rc_free list 603 * Lock(a) */ 604 uint8_t client_bufferlvl : 3, /* Expected range [0,5]: 0=unset, 1=low/empty */ 605 rack_deferred_inited : 1, 606 /* ******************************************************************** */ 607 /* Note for details of next two fields see rack_init_retransmit_rate() */ 608 /* ******************************************************************** */ 609 full_size_rxt: 1, 610 shape_rxt_to_pacing_min : 1, 611 /* ******************************************************************** */ 612 rc_ack_required: 1, 613 r_pacing_discount : 1; 614 uint8_t no_prr_addback : 1, 615 gp_ready : 1, 616 defer_options: 1, 617 excess_rxt_on: 1, /* Are actions on for excess retransmissions? */ 618 rc_ack_can_sendout_data: 1, /* 619 * If set it will override pacing restrictions on not sending 620 * data when the pacing timer is running. I.e. you set this 621 * and an ACK will send data. Default is off and its only used 622 * without pacing when we are doing 5G speed up for there 623 * ack filtering. 624 */ 625 rc_pacing_cc_set: 1, /* 626 * If we are pacing (pace_always=1) and we have reached the 627 * point where we start pacing (fixed or gp has reached its 628 * magic gp_ready state) this flag indicates we have set in 629 * values to effect CC's backoff's. If pacing is turned off 630 * then we must restore the values saved in rc_saved_beta, 631 * if its going to gp_ready we need to copy the values into 632 * the CC module and set our flags. 633 * 634 * Note this only happens if the cc name is newreno (CCALGONAME_NEWRENO). 635 */ 636 637 rc_rack_tmr_std_based :1, 638 rc_rack_use_dsack: 1; 639 uint8_t rc_dsack_round_seen: 1, 640 rc_last_tlp_acked_set: 1, 641 rc_last_tlp_past_cumack: 1, 642 rc_last_sent_tlp_seq_valid: 1, 643 rc_last_sent_tlp_past_cumack: 1, 644 probe_not_answered: 1, 645 rack_hibeta : 1, 646 lt_bw_up : 1; 647 uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */ 648 uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */ 649 rtt_limit_mul : 4, /* muliply this by low rtt */ 650 r_limit_scw : 1, 651 r_must_retran : 1, /* For non-sack customers we hit an RTO and new data should be resends */ 652 r_use_cmp_ack: 1, /* Do we use compressed acks */ 653 r_ent_rec_ns: 1, /* We entered recovery and have not sent */ 654 r_might_revert: 1, /* Flag to find out if we might need to revert */ 655 r_fast_output: 1, /* Fast output is in progress we can skip the bulk of rack_output */ 656 r_fsb_inited: 1, 657 r_rack_hw_rate_caps: 1, 658 r_up_only: 1, 659 r_via_fill_cw : 1, 660 r_fill_less_agg : 1; 661 662 uint8_t rc_user_set_max_segs; /* Socket option value Lock(a) */ 663 uint8_t rc_labc; /* Appropriate Byte Counting Value */ 664 uint16_t forced_ack : 1, 665 rc_gp_incr : 1, 666 rc_gp_bwred : 1, 667 rc_gp_timely_inc_cnt : 3, 668 rc_gp_timely_dec_cnt : 3, 669 r_use_labc_for_rec: 1, 670 rc_highly_buffered: 1, /* The path is highly buffered */ 671 rc_dragged_bottom: 1, 672 rc_pace_dnd : 1, /* The pace do not disturb bit */ 673 rc_avali2 : 1, 674 rc_gp_filled : 1, 675 rc_hw_nobuf : 1; 676 uint8_t r_state : 4, /* Current rack state Lock(a) */ 677 rc_catch_up : 1, /* catch up mode in dgp */ 678 rc_hybrid_mode : 1, /* We are in hybrid mode */ 679 rc_suspicious : 1, /* Suspect sacks have been given */ 680 rc_new_rnd_needed: 1; 681 uint8_t rc_tmr_stopped : 7, 682 t_timers_stopped : 1; 683 uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */ 684 rc_on_min_to : 1; 685 uint8_t r_timer_override : 1, /* hpts override Lock(a) */ 686 r_is_v6 : 1, /* V6 pcb Lock(a) */ 687 rc_in_persist : 1, 688 rc_tlp_in_progress : 1, 689 rc_always_pace : 1, /* Socket option value Lock(a) */ 690 rc_pace_to_cwnd : 1, 691 rc_pace_fill_if_rttin_range : 1, 692 rc_srtt_measure_made : 1; 693 uint8_t app_limited_needs_set : 1, 694 use_fixed_rate : 1, 695 rc_has_collapsed : 1, 696 r_cwnd_was_clamped : 1, 697 r_clamped_gets_lower : 1, 698 rack_hdrw_pacing : 1, /* We are doing Hardware pacing */ 699 rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */ 700 rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */ 701 uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */ 702 rack_rec_nonrxt_use_cr : 1, 703 rack_enable_scwnd : 1, 704 rack_attempted_scwnd : 1, 705 rack_no_prr : 1, 706 rack_scwnd_is_idle : 1; 707 uint8_t rc_allow_data_af_clo: 1, 708 delayed_ack : 1, 709 set_pacing_done_a_iw : 1, 710 use_rack_rr : 1, 711 alloc_limit_reported : 1, 712 sack_attack_disable : 1, 713 do_detection : 1, 714 rc_force_max_seg : 1; 715 uint8_t r_early : 1, 716 r_late : 1, 717 r_wanted_output: 1, 718 r_rr_config : 2, 719 r_persist_lt_bw_off : 1, 720 r_collapse_point_valid : 1, 721 dgp_on : 1; 722 uint16_t rc_init_win : 8, 723 rc_gp_rtt_set : 1, 724 rc_gp_dyn_mul : 1, 725 rc_gp_saw_rec : 1, 726 rc_gp_saw_ca : 1, 727 rc_gp_saw_ss : 1, 728 rc_gp_no_rec_chg : 1, 729 in_probe_rtt : 1, 730 measure_saw_probe_rtt : 1; 731 /* Cache line 2 0x40 */ 732 struct rack_control r_ctl; 733 } __aligned(CACHE_LINE_SIZE); 734 735 #endif 736 #endif 737