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_RACK_H_ 27 #define _NETINET_TCP_RACK_H_ 28 29 #define RACK_ACKED 0x000001/* The remote endpoint acked this */ 30 #define RACK_TO_REXT 0x000002/* A timeout occurred on this sendmap entry */ 31 #define RACK_DEFERRED 0x000004/* We can't use this for RTT calc - not used */ 32 #define RACK_OVERMAX 0x000008/* We have more retran's then we can fit */ 33 #define RACK_SACK_PASSED 0x000010/* A sack was done above this block */ 34 #define RACK_WAS_SACKPASS 0x000020/* We retransmitted due to SACK pass */ 35 #define RACK_HAS_FIN 0x000040/* segment is sent with fin */ 36 #define RACK_TLP 0x000080/* segment sent as tail-loss-probe */ 37 #define RACK_RWND_COLLAPSED 0x000100/* The peer collapsed the rwnd on the segment */ 38 #define RACK_APP_LIMITED 0x000200/* We went app limited after this send */ 39 #define RACK_WAS_ACKED 0x000400/* a RTO undid the ack, but it already had a rtt calc done */ 40 #define RACK_HAS_SYN 0x000800/* SYN is on this guy */ 41 #define RACK_SENT_W_DSACK 0x001000/* Sent with a dsack */ 42 #define RACK_SENT_SP 0x002000/* sent in slow path */ 43 #define RACK_SENT_FP 0x004000/* sent in fast path */ 44 #define RACK_HAD_PUSH 0x008000/* Push was sent on original send */ 45 #define RACK_MUST_RXT 0x010000/* We must retransmit this rsm (non-sack/mtu chg)*/ 46 #define RACK_IN_GP_WIN 0x020000/* Send was in GP window when sent */ 47 #define RACK_SHUFFLED 0x040000/* The RSM was shuffled some data from one to another */ 48 #define RACK_MERGED 0x080000/* The RSM was merged */ 49 #define RACK_PMTU_CHG 0x100000/* The path mtu changed on this guy */ 50 #define RACK_STRADDLE 0x200000/* The seq straddles the bucket line */ 51 #define RACK_NUM_OF_RETRANS 3 52 53 #define RACK_INITIAL_RTO 1000000 /* 1 second in microseconds */ 54 55 #define RACK_REQ_AVG 3 /* Must be less than 256 */ 56 57 struct rack_sendmap { 58 TAILQ_ENTRY(rack_sendmap) next; 59 TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */ 60 uint32_t bindex; 61 uint32_t r_start; /* Sequence number of the segment */ 62 uint32_t r_end; /* End seq, this is 1 beyond actually */ 63 uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ 64 uint32_t r_flags : 24, /* Flags as defined above */ 65 r_rtr_cnt : 8; /* Retran count, index this -1 to get time */ 66 struct mbuf *m; 67 uint32_t soff; 68 uint32_t orig_m_len; /* The original mbuf len when we sent (can update) */ 69 uint32_t orig_t_space; /* The original trailing space when we sent (can update) */ 70 uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */ 71 uint8_t r_dupack; /* Dup ack count */ 72 uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */ 73 uint8_t r_limit_type; /* is this entry counted against a limit? */ 74 uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */ 75 r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */ 76 r_no_rtt_allowed : 1, /* No rtt measurement allowed */ 77 r_hw_tls : 1, 78 r_avail : 4; 79 uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; 80 uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */ 81 uint32_t r_fas; /* Flight at send */ 82 uint8_t r_bas; /* The burst size (burst at send = bas) */ 83 }; 84 85 struct deferred_opt_list { 86 TAILQ_ENTRY(deferred_opt_list) next; 87 int optname; 88 uint64_t optval; 89 }; 90 91 /* 92 * Timestamps in the rack sendmap are now moving to be 93 * uint64_t's. This means that if you want a uint32_t 94 * usec timestamp (the old usecond timestamp) you simply have 95 * to cast it to uint32_t. The reason we do this is not for 96 * wrap, but we need to get back, at times, to the millisecond 97 * timestamp that is used in the TSTMP option. To do this we 98 * can use the rack_ts_to_msec() inline below which can take 99 * the 64bit ts and make into the correct timestamp millisecond 100 * wise. Thats not possible with the 32bit usecond timestamp since 101 * the seconds wrap too quickly to cover all bases. 102 * 103 * There are quite a few places in rack where I simply cast 104 * back to uint32_t and then end up using the TSTMP_XX() 105 * macros. This is ok, but we could do simple compares if 106 * we ever decided to move all of those variables to 64 bits 107 * as well. 108 */ 109 110 static inline uint64_t 111 rack_to_usec_ts(struct timeval *tv) 112 { 113 return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec); 114 } 115 116 static inline uint32_t 117 rack_ts_to_msec(uint64_t ts) 118 { 119 return((uint32_t)(ts / HPTS_MSEC_IN_SEC)); 120 } 121 122 123 TAILQ_HEAD(rack_head, rack_sendmap); 124 TAILQ_HEAD(def_opt_head, deferred_opt_list); 125 126 /* Map change logging */ 127 #define MAP_MERGE 0x01 128 #define MAP_SPLIT 0x02 129 #define MAP_NEW 0x03 130 #define MAP_SACK_M1 0x04 131 #define MAP_SACK_M2 0x05 132 #define MAP_SACK_M3 0x06 133 #define MAP_SACK_M4 0x07 134 #define MAP_SACK_M5 0x08 135 #define MAP_FREE 0x09 136 #define MAP_TRIM_HEAD 0x0a 137 138 #define RACK_LIMIT_TYPE_SPLIT 1 139 140 /* 141 * We use the rate sample structure to 142 * assist in single sack/ack rate and rtt 143 * calculation. In the future we will expand 144 * this in BBR to do forward rate sample 145 * b/w estimation. 146 */ 147 #define RACK_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ 148 #define RACK_RTT_VALID 0x00000002 /* We have at least one valid RTT */ 149 struct rack_rtt_sample { 150 uint32_t rs_flags; 151 uint32_t rs_rtt_lowest; 152 uint32_t rs_rtt_highest; 153 uint32_t rs_rtt_cnt; 154 uint32_t rs_us_rtt; 155 int32_t confidence; 156 uint64_t rs_rtt_tot; 157 uint16_t rs_us_rtrcnt; 158 }; 159 160 #define RACK_LOG_TYPE_ACK 0x01 161 #define RACK_LOG_TYPE_OUT 0x02 162 #define RACK_LOG_TYPE_TO 0x03 163 #define RACK_LOG_TYPE_ALLOC 0x04 164 #define RACK_LOG_TYPE_FREE 0x05 165 166 /* 167 * Magic numbers for logging timeout events if the 168 * logging is enabled. 169 */ 170 #define RACK_TO_FRM_TMR 1 171 #define RACK_TO_FRM_TLP 2 172 #define RACK_TO_FRM_RACK 3 173 #define RACK_TO_FRM_KEEP 4 174 #define RACK_TO_FRM_PERSIST 5 175 #define RACK_TO_FRM_DELACK 6 176 177 struct rack_opts_stats { 178 uint64_t tcp_rack_tlp_reduce; 179 uint64_t tcp_rack_pace_always; 180 uint64_t tcp_rack_pace_reduce; 181 uint64_t tcp_rack_max_seg; 182 uint64_t tcp_rack_prr_sendalot; 183 uint64_t tcp_rack_min_to; 184 uint64_t tcp_rack_early_seg; 185 uint64_t tcp_rack_reord_thresh; 186 uint64_t tcp_rack_reord_fade; 187 uint64_t tcp_rack_tlp_thresh; 188 uint64_t tcp_rack_pkt_delay; 189 uint64_t tcp_rack_tlp_inc_var; 190 uint64_t tcp_tlp_use; 191 uint64_t tcp_rack_idle_reduce; 192 uint64_t tcp_rack_idle_reduce_high; 193 uint64_t rack_no_timer_in_hpts; 194 uint64_t tcp_rack_min_pace_seg; 195 uint64_t tcp_rack_pace_rate_ca; 196 uint64_t tcp_rack_rr; 197 uint64_t tcp_rack_do_detection; 198 uint64_t tcp_rack_rrr_no_conf_rate; 199 uint64_t tcp_initial_rate; 200 uint64_t tcp_initial_win; 201 uint64_t tcp_hdwr_pacing; 202 uint64_t tcp_gp_inc_ss; 203 uint64_t tcp_gp_inc_ca; 204 uint64_t tcp_gp_inc_rec; 205 uint64_t tcp_rack_force_max_seg; 206 uint64_t tcp_rack_pace_rate_ss; 207 uint64_t tcp_rack_pace_rate_rec; 208 /* Temp counters for dsack */ 209 uint64_t tcp_sack_path_1; /* not used */ 210 uint64_t tcp_sack_path_2a; /* not used */ 211 uint64_t tcp_sack_path_2b; /* not used */ 212 uint64_t tcp_sack_path_3; /* not used */ 213 uint64_t tcp_sack_path_4; /* not used */ 214 /* non temp counters */ 215 uint64_t tcp_rack_scwnd; 216 uint64_t tcp_rack_noprr; 217 uint64_t tcp_rack_cfg_rate; 218 uint64_t tcp_timely_dyn; 219 uint64_t tcp_rack_mbufq; 220 uint64_t tcp_fillcw; 221 uint64_t tcp_npush; 222 uint64_t tcp_lscwnd; 223 uint64_t tcp_profile; 224 uint64_t tcp_hdwr_rate_cap; 225 uint64_t tcp_pacing_rate_cap; 226 uint64_t tcp_pacing_up_only; 227 uint64_t tcp_use_cmp_acks; 228 uint64_t tcp_rack_abc_val; 229 uint64_t tcp_rec_abc_val; 230 uint64_t tcp_rack_measure_cnt; 231 uint64_t tcp_rack_delayed_ack; 232 uint64_t tcp_rack_rtt_use; 233 uint64_t tcp_data_after_close; 234 uint64_t tcp_defer_opt; 235 uint64_t tcp_rxt_clamp; 236 uint64_t tcp_rack_beta; 237 uint64_t tcp_rack_beta_ecn; 238 uint64_t tcp_rack_timer_slop; 239 uint64_t tcp_rack_dsack_opt; 240 uint64_t tcp_rack_hi_beta; 241 uint64_t tcp_split_limit; 242 uint64_t tcp_rack_pacing_divisor; 243 uint64_t tcp_rack_min_seg; 244 uint64_t tcp_dgp_in_rec; 245 }; 246 247 /* RTT shrink reasons */ 248 #define RACK_RTTS_INIT 0 249 #define RACK_RTTS_NEWRTT 1 250 #define RACK_RTTS_EXITPROBE 2 251 #define RACK_RTTS_ENTERPROBE 3 252 #define RACK_RTTS_REACHTARGET 4 253 #define RACK_RTTS_SEEHBP 5 254 #define RACK_RTTS_NOBACKOFF 6 255 #define RACK_RTTS_SAFETY 7 256 257 #define RACK_USE_BEG 1 258 #define RACK_USE_END 2 259 #define RACK_USE_END_OR_THACK 3 260 261 #define TLP_USE_ID 1 /* Internet draft behavior */ 262 #define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */ 263 #define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */ 264 #define RACK_MIN_BW 8000 /* 64kbps in Bps */ 265 266 /* Rack quality indicators for GPUT measurements */ 267 #define RACK_QUALITY_NONE 0 /* No quality stated */ 268 #define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */ 269 #define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */ 270 #define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */ 271 #define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */ 272 #define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */ 273 274 #define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */ 275 #ifdef _KERNEL 276 #define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t)) 277 extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; 278 #define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm)) 279 #define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1) 280 #endif 281 /* 282 * As we get each SACK we wade through the 283 * rc_map and mark off what is acked. 284 * We also increment rc_sacked as well. 285 * 286 * We also pay attention to missing entries 287 * based on the time and possibly mark them 288 * for retransmit. If we do and we are not already 289 * in recovery we enter recovery. In doing 290 * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. 291 * We also setup rc_next/rc_snd_nxt/rc_send_end so 292 * we will know where to send from. When not in 293 * recovery rc_next will be NULL and rc_snd_nxt should 294 * equal snd_max. 295 * 296 * Whenever we retransmit from recovery we increment 297 * rc_holes_rxt as we retran a block and mark it as retransmitted 298 * with the time it was sent. During non-recovery sending we 299 * add to our map and note the time down of any send expanding 300 * the rc_map at the tail and moving rc_snd_nxt up with snd_max. 301 * 302 * In recovery during SACK/ACK processing if a chunk has 303 * been retransmitted and it is now acked, we decrement rc_holes_rxt. 304 * When we retransmit from the scoreboard we use 305 * rc_next and rc_snd_nxt/rc_send_end to help us 306 * find what needs to be retran. 307 * 308 * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt 309 * This gets us the effect of RFC6675 pipe, counting twice for 310 * bytes retransmitted. 311 */ 312 313 #define TT_RACK_FR_TMR 0x2000 314 315 /* 316 * Locking for the rack control block. 317 * a) Locked by INP_WLOCK 318 * b) Locked by the hpts-mutex 319 * 320 */ 321 #define RACK_GP_HIST 4 /* How much goodput history do we maintain? */ 322 323 #define RACK_NUM_FSB_DEBUG 16 324 #ifdef _KERNEL 325 struct rack_fast_send_blk { 326 uint32_t left_to_send; 327 uint16_t tcp_ip_hdr_len; 328 uint8_t tcp_flags; 329 uint8_t hoplimit; 330 uint8_t *tcp_ip_hdr; 331 uint32_t recwin; 332 uint32_t off; 333 struct tcphdr *th; 334 struct udphdr *udp; 335 struct mbuf *m; 336 uint32_t o_m_len; 337 uint32_t o_t_len; 338 uint32_t rfo_apply_push : 1, 339 hw_tls : 1, 340 unused : 30; 341 }; 342 343 struct tailq_hash; 344 345 struct rack_control { 346 /* Second cache line 0x40 from tcp_rack */ 347 struct tailq_hash *tqh; /* Tree of all segments Lock(a) */ 348 struct rack_head rc_tmap; /* List in transmit order Lock(a) */ 349 struct rack_sendmap *rc_tlpsend; /* Remembered place for 350 * tlp_sending Lock(a) */ 351 struct rack_sendmap *rc_resend; /* something we have been asked to 352 * resend */ 353 struct rack_fast_send_blk fsb; /* The fast-send block */ 354 uint32_t timer_slop; 355 uint16_t pace_len_divisor; 356 uint16_t rc_user_set_min_segs; 357 uint32_t rc_hpts_flags; 358 uint32_t rc_fixed_pacing_rate_ca; 359 uint32_t rc_fixed_pacing_rate_rec; 360 uint32_t rc_fixed_pacing_rate_ss; 361 uint32_t cwnd_to_use; /* The cwnd in use */ 362 uint32_t rc_timer_exp; /* If a timer ticks of expiry */ 363 uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */ 364 uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */ 365 366 /* Third Cache line 0x80 */ 367 struct rack_head rc_free; /* Allocation array */ 368 uint64_t last_hw_bw_req; 369 uint64_t crte_prev_rate; 370 uint64_t bw_rate_cap; 371 uint64_t last_cumack_advance; /* Last time cumack moved forward */ 372 uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ 373 374 uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP 375 * Lock(a) */ 376 uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */ 377 378 uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */ 379 380 uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */ 381 382 uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ 383 uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */ 384 385 uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */ 386 387 uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */ 388 uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */ 389 390 uint32_t rc_loss_count; /* How many bytes have been retransmitted 391 * Lock(a) */ 392 uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ 393 394 /* Forth cache line 0xc0 */ 395 /* Times */ 396 397 uint32_t rc_rack_tmit_time; /* Rack transmit time Lock(a) */ 398 uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ 399 400 uint32_t rc_num_maps_alloced; /* Number of map blocks (sacks) we 401 * have allocated */ 402 uint32_t rc_rcvtime; /* When we last received data */ 403 uint32_t rc_num_split_allocs; /* num split map entries allocated */ 404 uint32_t rc_split_limit; /* Limit from control var can be set by socket opt */ 405 406 uint32_t rc_last_output_to; 407 uint32_t rc_went_idle_time; 408 409 struct rack_sendmap *rc_sacklast; /* sack remembered place 410 * Lock(a) */ 411 412 struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */ 413 struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */ 414 /* Cache line split 0x100 */ 415 struct sack_filter rack_sf; 416 /* Cache line split 0x140 */ 417 /* Flags for various things */ 418 uint32_t rc_pace_max_segs; 419 uint32_t rc_pace_min_segs; 420 uint32_t rc_app_limited_cnt; 421 uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */ 422 uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */ 423 uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 424 uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 425 uint32_t rc_high_rwnd; 426 uint32_t ack_count; 427 uint32_t sack_count; 428 uint32_t sack_noextra_move; 429 uint32_t sack_moved_extra; 430 struct rack_rtt_sample rack_rs; 431 const struct tcp_hwrate_limit_table *crte; 432 uint32_t rc_agg_early; 433 uint32_t rc_agg_delayed; 434 uint32_t rc_tlp_rxt_last_time; 435 uint32_t rc_saved_cwnd; 436 uint64_t rc_gp_output_ts; /* chg*/ 437 uint64_t rc_gp_cumack_ts; /* chg*/ 438 struct timeval act_rcv_time; 439 struct timeval rc_last_time_decay; /* SAD time decay happened here */ 440 uint64_t gp_bw; 441 uint64_t init_rate; 442 #ifdef NETFLIX_SHARED_CWND 443 struct shared_cwnd *rc_scw; 444 #endif 445 uint64_t last_gp_comp_bw; 446 uint64_t last_max_bw; /* Our calculated max b/w last */ 447 struct time_filter_small rc_gp_min_rtt; 448 struct def_opt_head opt_list; 449 uint64_t lt_bw_time; /* Total time with data outstanding (lt_bw = long term bandwidth) */ 450 uint64_t lt_bw_bytes; /* Total bytes acked */ 451 uint64_t lt_timemark; /* 64 bit timestamp when we started sending */ 452 struct tcp_sendfile_track *rc_last_sft; 453 uint32_t lt_seq; /* Seq at start of lt_bw gauge */ 454 int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */ 455 uint64_t last_sndbytes; 456 uint64_t last_snd_rxt_bytes; 457 uint64_t rxt_threshold; 458 uint64_t last_tmit_time_acked; /* Holds the last cumack point's last send time */ 459 uint32_t last_rnd_rxt_clamped; 460 uint32_t num_of_clamps_applied; 461 uint32_t clamp_options; 462 uint32_t max_clamps; 463 464 uint32_t rc_gp_srtt; /* Current GP srtt */ 465 uint32_t rc_prev_gp_srtt; /* Previous RTT */ 466 uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */ 467 uint32_t rc_loss_at_start; /* At measurement window where was our lost value */ 468 469 uint32_t dsack_round_end; /* In a round of seeing a DSACK */ 470 uint32_t current_round; /* Starting at zero */ 471 uint32_t roundends; /* acked value above which round ends */ 472 uint32_t num_dsack; /* Count of dsack's seen (1 per window)*/ 473 uint32_t forced_ack_ts; 474 uint32_t last_collapse_point; /* Last point peer collapsed too */ 475 uint32_t high_collapse_point; 476 uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */ 477 uint32_t rc_time_probertt_entered; 478 uint32_t rc_time_probertt_starts; 479 uint32_t rc_lowest_us_rtt; 480 uint32_t rc_highest_us_rtt; 481 uint32_t rc_last_us_rtt; 482 uint32_t rc_time_of_last_probertt; 483 uint32_t rc_target_probertt_flight; 484 uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */ 485 uint32_t rc_cwnd_at_erec; 486 uint32_t rc_ssthresh_at_erec; 487 uint32_t dsack_byte_cnt; 488 uint32_t retran_during_recovery; 489 uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */ 490 uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */ 491 uint32_t rc_snd_max_at_rto; /* For non-sack when the RTO occurred what was snd-max */ 492 uint32_t rc_out_at_rto; 493 int32_t rc_scw_index; 494 uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */ 495 uint32_t rc_last_timeout_snduna; 496 uint32_t last_tlp_acked_start; 497 uint32_t last_tlp_acked_end; 498 uint32_t challenge_ack_ts; 499 uint32_t challenge_ack_cnt; 500 uint32_t rc_min_to; /* Socket option value Lock(a) */ 501 uint32_t rc_pkt_delay; /* Socket option value Lock(a) */ 502 uint32_t persist_lost_ends; 503 uint32_t ack_during_sd; 504 uint32_t input_pkt; 505 uint32_t saved_input_pkt; 506 uint32_t saved_rxt_clamp_val; /* The encoded value we used to setup clamping */ 507 struct newreno rc_saved_beta; /* 508 * For newreno cc: 509 * rc_saved_cc are the values we have had 510 * set by the user, if pacing is not happening 511 * (i.e. its early and we have not turned on yet 512 * or it was turned off). The minute pacing 513 * is turned on we pull out the values currently 514 * being used by newreno and replace them with 515 * these values, then save off the old values here, 516 * we also set the flag (if ecn_beta is set) to make 517 * new_reno do less of a backoff for ecn (think abe). 518 */ 519 uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */ 520 uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ 521 uint8_t rack_per_upper_bound_ss; 522 uint8_t rack_per_upper_bound_ca; 523 uint8_t dsack_persist; 524 uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */ 525 uint8_t num_measurements; /* Number of measurements (up to 0xff, we freeze at 0xff) */ 526 uint8_t req_measurements; /* How many measurements are required? */ 527 uint8_t saved_hibeta; 528 uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */ 529 uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */ 530 uint8_t rc_rate_sample_method; 531 uint8_t rc_dgp_bl_agg; /* Buffer Level aggression during DGP */ 532 uint8_t full_dgp_in_rec; /* Flag to say if we do full DGP in recovery */ 533 uint8_t client_suggested_maxseg; /* Not sure what to do with this yet */ 534 uint8_t pacing_discount_amm; /* 535 * This is a multipler to the base discount that 536 * can be used to increase the discount. 537 */ 538 uint8_t already_had_a_excess; 539 }; 540 #endif 541 542 /* DGP with no buffer level mitigations */ 543 #define DGP_LEVEL0 0 544 545 /* 546 * DGP with buffer level mitigation where BL:4 caps fillcw and BL:5 547 * turns off fillcw. 548 */ 549 #define DGP_LEVEL1 1 550 551 /* 552 * DGP with buffer level mitigation where BL:3 caps fillcw and BL:4 turns off fillcw 553 * and BL:5 reduces by 10% 554 */ 555 #define DGP_LEVEL2 2 556 557 /* 558 * DGP with buffer level mitigation where BL:2 caps fillcw and BL:3 turns off 559 * fillcw BL:4 reduces by 10% and BL:5 reduces by 20% 560 */ 561 #define DGP_LEVEL3 3 562 563 /* Hybrid pacing log defines */ 564 #define HYBRID_LOG_NO_ROOM 0 /* No room for the clients request */ 565 #define HYBRID_LOG_TURNED_OFF 1 /* Turned off hybrid pacing */ 566 #define HYBRID_LOG_NO_PACING 2 /* Failed to set pacing on */ 567 #define HYBRID_LOG_RULES_SET 3 /* Hybrid pacing for this chunk is set */ 568 #define HYBRID_LOG_NO_RANGE 4 /* In DGP mode, no range found */ 569 #define HYBRID_LOG_RULES_APP 5 /* The specified rules were applied */ 570 #define HYBRID_LOG_REQ_COMP 6 /* The request completed */ 571 #define HYBRID_LOG_BW_MEASURE 7 /* Follow up b/w measurements to the previous completed log */ 572 #define HYBRID_LOG_RATE_CAP 8 /* We had a rate cap apply */ 573 #define HYBRID_LOG_CAP_CALC 9 /* How we calculate the cap */ 574 #define HYBRID_LOG_ISSAME 10 /* Same as before -- temp */ 575 #define HYBRID_LOG_ALLSENT 11 /* We sent it all no more rate-cap */ 576 #define HYBRID_LOG_OUTOFTIME 12 /* We are past the deadline DGP */ 577 #define HYBRID_LOG_CAPERROR 13 /* Hit one of the TSNH cases */ 578 #define HYBRID_LOG_EXTEND 14 /* We extended the end */ 579 #define HYBRID_LOG_SENT_LOST 15 /* A closing sent/lost report */ 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 #define MAX_USER_SET_SEG 0x3f /* The max we can set is 63 which is probably too many */ 593 594 #ifdef _KERNEL 595 596 struct tcp_rack { 597 /* First cache line 0x00 */ 598 TAILQ_ENTRY(tcp_rack) r_hpts; /* hptsi queue next Lock(b) */ 599 int32_t(*r_substate) (struct mbuf *, struct tcphdr *, 600 struct socket *, struct tcpcb *, struct tcpopt *, 601 int32_t, int32_t, uint32_t, int, int, uint8_t); /* Lock(a) */ 602 struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ 603 struct inpcb *rc_inp; /* The inpcb Lock(a) */ 604 uint8_t rc_free_cnt; /* Number of free entries on the rc_free list 605 * Lock(a) */ 606 uint8_t client_bufferlvl : 3, /* Expected range [0,5]: 0=unset, 1=low/empty */ 607 rack_deferred_inited : 1, 608 /* ******************************************************************** */ 609 /* Note for details of next two fields see rack_init_retransmit_rate() */ 610 /* ******************************************************************** */ 611 full_size_rxt: 1, 612 shape_rxt_to_pacing_min : 1, 613 /* ******************************************************************** */ 614 rc_ack_required: 1, 615 r_pacing_discount : 1; 616 uint8_t no_prr_addback : 1, 617 gp_ready : 1, 618 defer_options: 1, 619 excess_rxt_on: 1, /* Are actions on for excess retransmissions? */ 620 rc_ack_can_sendout_data: 1, /* 621 * If set it will override pacing restrictions on not sending 622 * data when the pacing timer is running. I.e. you set this 623 * and an ACK will send data. Default is off and its only used 624 * without pacing when we are doing 5G speed up for there 625 * ack filtering. 626 */ 627 rc_pacing_cc_set: 1, /* 628 * If we are pacing (pace_always=1) and we have reached the 629 * point where we start pacing (fixed or gp has reached its 630 * magic gp_ready state) this flag indicates we have set in 631 * values to effect CC's backoff's. If pacing is turned off 632 * then we must restore the values saved in rc_saved_beta, 633 * if its going to gp_ready we need to copy the values into 634 * the CC module and set our flags. 635 * 636 * Note this only happens if the cc name is newreno (CCALGONAME_NEWRENO). 637 */ 638 639 rc_rack_tmr_std_based :1, 640 rc_rack_use_dsack: 1; 641 uint8_t rc_dsack_round_seen: 1, 642 rc_last_tlp_acked_set: 1, 643 rc_last_tlp_past_cumack: 1, 644 rc_last_sent_tlp_seq_valid: 1, 645 rc_last_sent_tlp_past_cumack: 1, 646 probe_not_answered: 1, 647 rack_hibeta : 1, 648 lt_bw_up : 1; 649 uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */ 650 uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */ 651 rtt_limit_mul : 4, /* muliply this by low rtt */ 652 r_limit_scw : 1, 653 r_must_retran : 1, /* For non-sack customers we hit an RTO and new data should be resends */ 654 r_use_cmp_ack: 1, /* Do we use compressed acks */ 655 r_ent_rec_ns: 1, /* We entered recovery and have not sent */ 656 r_might_revert: 1, /* Flag to find out if we might need to revert */ 657 r_fast_output: 1, /* Fast output is in progress we can skip the bulk of rack_output */ 658 r_fsb_inited: 1, 659 r_rack_hw_rate_caps: 1, 660 r_up_only: 1, 661 r_via_fill_cw : 1, 662 r_fill_less_agg : 1; 663 664 uint8_t rc_user_set_max_segs : 7, /* Socket option value Lock(a) */ 665 rc_fillcw_apply_discount; 666 uint8_t rc_labc; /* Appropriate Byte Counting Value */ 667 uint16_t forced_ack : 1, 668 rc_gp_incr : 1, 669 rc_gp_bwred : 1, 670 rc_gp_timely_inc_cnt : 3, 671 rc_gp_timely_dec_cnt : 3, 672 r_use_labc_for_rec: 1, 673 rc_highly_buffered: 1, /* The path is highly buffered */ 674 rc_dragged_bottom: 1, 675 rc_pace_dnd : 1, /* The pace do not disturb bit */ 676 rc_avali2 : 1, 677 rc_gp_filled : 1, 678 rc_hw_nobuf : 1; 679 uint8_t r_state : 4, /* Current rack state Lock(a) */ 680 rc_catch_up : 1, /* catch up mode in dgp */ 681 rc_hybrid_mode : 1, /* We are in hybrid mode */ 682 rc_suspicious : 1, /* Suspect sacks have been given */ 683 rc_new_rnd_needed: 1; 684 uint8_t rc_tmr_stopped : 7, 685 t_timers_stopped : 1; 686 uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */ 687 rc_on_min_to : 1; 688 uint8_t r_timer_override : 1, /* hpts override Lock(a) */ 689 r_is_v6 : 1, /* V6 pcb Lock(a) */ 690 rc_in_persist : 1, 691 rc_tlp_in_progress : 1, 692 rc_always_pace : 1, /* Socket option value Lock(a) */ 693 rc_pace_to_cwnd : 1, 694 rc_pace_fill_if_rttin_range : 1, 695 rc_srtt_measure_made : 1; 696 uint8_t app_limited_needs_set : 1, 697 use_fixed_rate : 1, 698 rc_has_collapsed : 1, 699 r_cwnd_was_clamped : 1, 700 r_clamped_gets_lower : 1, 701 rack_hdrw_pacing : 1, /* We are doing Hardware pacing */ 702 rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */ 703 rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */ 704 uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */ 705 rack_rec_nonrxt_use_cr : 1, 706 rack_enable_scwnd : 1, 707 rack_attempted_scwnd : 1, 708 rack_no_prr : 1, 709 rack_scwnd_is_idle : 1; 710 uint8_t rc_allow_data_af_clo: 1, 711 delayed_ack : 1, 712 set_pacing_done_a_iw : 1, 713 use_rack_rr : 1, 714 alloc_limit_reported : 1, 715 sack_attack_disable : 1, 716 do_detection : 1, 717 rc_force_max_seg : 1; 718 uint8_t r_early : 1, 719 r_late : 1, 720 r_wanted_output: 1, 721 r_rr_config : 2, 722 r_persist_lt_bw_off : 1, 723 r_collapse_point_valid : 1, 724 dgp_on : 1; 725 uint16_t rc_init_win : 8, 726 rc_gp_rtt_set : 1, 727 rc_gp_dyn_mul : 1, 728 rc_gp_saw_rec : 1, 729 rc_gp_saw_ca : 1, 730 rc_gp_saw_ss : 1, 731 rc_gp_no_rec_chg : 1, 732 in_probe_rtt : 1, 733 measure_saw_probe_rtt : 1; 734 /* Cache line 2 0x40 */ 735 struct rack_control r_ctl; 736 } __aligned(CACHE_LINE_SIZE); 737 738 #endif 739 #endif 740