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 occured 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_NUM_OF_RETRANS 3 49 50 #define RACK_INITIAL_RTO 1000000 /* 1 second in microseconds */ 51 52 #define RACK_REQ_AVG 3 /* Must be less than 256 */ 53 54 struct rack_sendmap { 55 TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */ 56 uint32_t r_start; /* Sequence number of the segment */ 57 uint32_t r_end; /* End seq, this is 1 beyond actually */ 58 uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ 59 uint32_t r_flags : 24, /* Flags as defined above */ 60 r_rtr_cnt : 8; /* Retran count, index this -1 to get time */ 61 struct mbuf *m; 62 uint32_t soff; 63 uint32_t orig_m_len; 64 uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */ 65 uint8_t r_dupack; /* Dup ack count */ 66 uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */ 67 uint8_t r_limit_type; /* is this entry counted against a limit? */ 68 uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */ 69 r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */ 70 r_no_rtt_allowed : 1, /* No rtt measurement allowed */ 71 r_hw_tls : 1, 72 r_avail : 4; 73 uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; 74 uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */ 75 RB_ENTRY(rack_sendmap) r_next; /* RB Tree next */ 76 uint32_t r_fas; /* Flight at send */ 77 }; 78 79 struct deferred_opt_list { 80 TAILQ_ENTRY(deferred_opt_list) next; 81 int optname; 82 uint64_t optval; 83 }; 84 85 /* 86 * Timestamps in the rack sendmap are now moving to be 87 * uint64_t's. This means that if you want a uint32_t 88 * usec timestamp (the old usecond timestamp) you simply have 89 * to cast it to uint32_t. The reason we do this is not for 90 * wrap, but we need to get back, at times, to the millisecond 91 * timestamp that is used in the TSTMP option. To do this we 92 * can use the rack_ts_to_msec() inline below which can take 93 * the 64bit ts and make into the correct timestamp millisecond 94 * wise. Thats not possible with the 32bit usecond timestamp since 95 * the seconds wrap too quickly to cover all bases. 96 * 97 * There are quite a few places in rack where I simply cast 98 * back to uint32_t and then end up using the TSTMP_XX() 99 * macros. This is ok, but we could do simple compares if 100 * we ever decided to move all of those variables to 64 bits 101 * as well. 102 */ 103 104 inline uint64_t 105 rack_to_usec_ts(struct timeval *tv) 106 { 107 return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec); 108 } 109 110 inline uint32_t 111 rack_ts_to_msec(uint64_t ts) 112 { 113 return((uint32_t)(ts / HPTS_MSEC_IN_SEC)); 114 } 115 116 117 RB_HEAD(rack_rb_tree_head, rack_sendmap); 118 TAILQ_HEAD(rack_head, rack_sendmap); 119 TAILQ_HEAD(def_opt_head, deferred_opt_list); 120 121 /* Map change logging */ 122 #define MAP_MERGE 0x01 123 #define MAP_SPLIT 0x02 124 #define MAP_NEW 0x03 125 #define MAP_SACK_M1 0x04 126 #define MAP_SACK_M2 0x05 127 #define MAP_SACK_M3 0x06 128 #define MAP_SACK_M4 0x07 129 #define MAP_SACK_M5 0x08 130 #define MAP_FREE 0x09 131 #define MAP_TRIM_HEAD 0x0a 132 133 #define RACK_LIMIT_TYPE_SPLIT 1 134 135 /* 136 * We use the rate sample structure to 137 * assist in single sack/ack rate and rtt 138 * calculation. In the future we will expand 139 * this in BBR to do forward rate sample 140 * b/w estimation. 141 */ 142 #define RACK_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ 143 #define RACK_RTT_VALID 0x00000002 /* We have at least one valid RTT */ 144 struct rack_rtt_sample { 145 uint32_t rs_flags; 146 uint32_t rs_rtt_lowest; 147 uint32_t rs_rtt_highest; 148 uint32_t rs_rtt_cnt; 149 uint32_t rs_us_rtt; 150 int32_t confidence; 151 uint64_t rs_rtt_tot; 152 uint16_t rs_us_rtrcnt; 153 }; 154 155 #define RACK_LOG_TYPE_ACK 0x01 156 #define RACK_LOG_TYPE_OUT 0x02 157 #define RACK_LOG_TYPE_TO 0x03 158 #define RACK_LOG_TYPE_ALLOC 0x04 159 #define RACK_LOG_TYPE_FREE 0x05 160 161 struct rack_log { 162 union { 163 struct rack_sendmap *rsm; /* For alloc/free */ 164 uint64_t sb_acc;/* For out/ack or t-o */ 165 }; 166 uint32_t th_seq; 167 uint32_t th_ack; 168 uint32_t snd_una; 169 uint32_t snd_nxt; /* th_win for TYPE_ACK */ 170 uint32_t snd_max; 171 uint32_t blk_start[4]; 172 uint32_t blk_end[4]; 173 uint8_t type; 174 uint8_t n_sackblks; 175 uint16_t len; /* Timeout T3=1, TLP=2, RACK=3 */ 176 }; 177 178 /* 179 * Magic numbers for logging timeout events if the 180 * logging is enabled. 181 */ 182 #define RACK_TO_FRM_TMR 1 183 #define RACK_TO_FRM_TLP 2 184 #define RACK_TO_FRM_RACK 3 185 #define RACK_TO_FRM_KEEP 4 186 #define RACK_TO_FRM_PERSIST 5 187 #define RACK_TO_FRM_DELACK 6 188 189 struct rack_opts_stats { 190 uint64_t tcp_rack_tlp_reduce; 191 uint64_t tcp_rack_pace_always; 192 uint64_t tcp_rack_pace_reduce; 193 uint64_t tcp_rack_max_seg; 194 uint64_t tcp_rack_prr_sendalot; 195 uint64_t tcp_rack_min_to; 196 uint64_t tcp_rack_early_seg; 197 uint64_t tcp_rack_reord_thresh; 198 uint64_t tcp_rack_reord_fade; 199 uint64_t tcp_rack_tlp_thresh; 200 uint64_t tcp_rack_pkt_delay; 201 uint64_t tcp_rack_tlp_inc_var; 202 uint64_t tcp_tlp_use; 203 uint64_t tcp_rack_idle_reduce; 204 uint64_t tcp_rack_idle_reduce_high; 205 uint64_t rack_no_timer_in_hpts; 206 uint64_t tcp_rack_min_pace_seg; 207 uint64_t tcp_rack_pace_rate_ca; 208 uint64_t tcp_rack_rr; 209 uint64_t tcp_rack_do_detection; 210 uint64_t tcp_rack_rrr_no_conf_rate; 211 uint64_t tcp_initial_rate; 212 uint64_t tcp_initial_win; 213 uint64_t tcp_hdwr_pacing; 214 uint64_t tcp_gp_inc_ss; 215 uint64_t tcp_gp_inc_ca; 216 uint64_t tcp_gp_inc_rec; 217 uint64_t tcp_rack_force_max_seg; 218 uint64_t tcp_rack_pace_rate_ss; 219 uint64_t tcp_rack_pace_rate_rec; 220 /* Temp counters for dsack */ 221 uint64_t tcp_sack_path_1; 222 uint64_t tcp_sack_path_2a; 223 uint64_t tcp_sack_path_2b; 224 uint64_t tcp_sack_path_3; 225 uint64_t tcp_sack_path_4; 226 /* non temp counters */ 227 uint64_t tcp_rack_scwnd; 228 uint64_t tcp_rack_noprr; 229 uint64_t tcp_rack_cfg_rate; 230 uint64_t tcp_timely_dyn; 231 uint64_t tcp_rack_mbufq; 232 uint64_t tcp_fillcw; 233 uint64_t tcp_npush; 234 uint64_t tcp_lscwnd; 235 uint64_t tcp_profile; 236 uint64_t tcp_hdwr_rate_cap; 237 uint64_t tcp_pacing_rate_cap; 238 uint64_t tcp_pacing_up_only; 239 uint64_t tcp_use_cmp_acks; 240 uint64_t tcp_rack_abc_val; 241 uint64_t tcp_rec_abc_val; 242 uint64_t tcp_rack_measure_cnt; 243 uint64_t tcp_rack_delayed_ack; 244 uint64_t tcp_rack_rtt_use; 245 uint64_t tcp_data_after_close; 246 uint64_t tcp_defer_opt; 247 uint64_t tcp_rack_fastrsm_hack; 248 uint64_t tcp_rack_beta; 249 uint64_t tcp_rack_beta_ecn; 250 uint64_t tcp_rack_timer_slop; 251 uint64_t tcp_rack_dsack_opt; 252 }; 253 254 /* RTT shrink reasons */ 255 #define RACK_RTTS_INIT 0 256 #define RACK_RTTS_NEWRTT 1 257 #define RACK_RTTS_EXITPROBE 2 258 #define RACK_RTTS_ENTERPROBE 3 259 #define RACK_RTTS_REACHTARGET 4 260 #define RACK_RTTS_SEEHBP 5 261 #define RACK_RTTS_NOBACKOFF 6 262 #define RACK_RTTS_SAFETY 7 263 264 #define RACK_USE_BEG 1 265 #define RACK_USE_END 2 266 #define RACK_USE_END_OR_THACK 3 267 268 #define TLP_USE_ID 1 /* Internet draft behavior */ 269 #define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */ 270 #define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */ 271 #define RACK_MIN_BW 8000 /* 64kbps in Bps */ 272 273 /* Rack quality indicators for GPUT measurements */ 274 #define RACK_QUALITY_NONE 0 /* No quality stated */ 275 #define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */ 276 #define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */ 277 #define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */ 278 #define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */ 279 #define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */ 280 281 282 #define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */ 283 #ifdef _KERNEL 284 #define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t)) 285 extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; 286 #define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm)) 287 #define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1) 288 #endif 289 /* 290 * As we get each SACK we wade through the 291 * rc_map and mark off what is acked. 292 * We also increment rc_sacked as well. 293 * 294 * We also pay attention to missing entries 295 * based on the time and possibly mark them 296 * for retransmit. If we do and we are not already 297 * in recovery we enter recovery. In doing 298 * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. 299 * We also setup rc_next/rc_snd_nxt/rc_send_end so 300 * we will know where to send from. When not in 301 * recovery rc_next will be NULL and rc_snd_nxt should 302 * equal snd_max. 303 * 304 * Whenever we retransmit from recovery we increment 305 * rc_holes_rxt as we retran a block and mark it as retransmitted 306 * with the time it was sent. During non-recovery sending we 307 * add to our map and note the time down of any send expanding 308 * the rc_map at the tail and moving rc_snd_nxt up with snd_max. 309 * 310 * In recovery during SACK/ACK processing if a chunk has 311 * been retransmitted and it is now acked, we decrement rc_holes_rxt. 312 * When we retransmit from the scoreboard we use 313 * rc_next and rc_snd_nxt/rc_send_end to help us 314 * find what needs to be retran. 315 * 316 * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt 317 * This gets us the effect of RFC6675 pipe, counting twice for 318 * bytes retransmitted. 319 */ 320 321 #define TT_RACK_FR_TMR 0x2000 322 323 /* 324 * Locking for the rack control block. 325 * a) Locked by INP_WLOCK 326 * b) Locked by the hpts-mutex 327 * 328 */ 329 #define RACK_GP_HIST 4 /* How much goodput history do we maintain? */ 330 331 #define RACK_NUM_FSB_DEBUG 16 332 #ifdef _KERNEL 333 struct rack_fast_send_blk { 334 uint32_t left_to_send; 335 uint16_t tcp_ip_hdr_len; 336 uint8_t tcp_flags; 337 uint8_t hoplimit; 338 uint8_t *tcp_ip_hdr; 339 uint32_t recwin; 340 uint32_t off; 341 struct tcphdr *th; 342 struct udphdr *udp; 343 struct mbuf *m; 344 uint32_t o_m_len; 345 uint32_t rfo_apply_push : 1, 346 hw_tls : 1, 347 unused : 30; 348 }; 349 350 struct rack_control { 351 /* Second cache line 0x40 from tcp_rack */ 352 struct rack_rb_tree_head rc_mtree; /* Tree of all segments Lock(a) */ 353 struct rack_head rc_tmap; /* List in transmit order Lock(a) */ 354 struct rack_sendmap *rc_tlpsend; /* Remembered place for 355 * tlp_sending Lock(a) */ 356 struct rack_sendmap *rc_resend; /* something we have been asked to 357 * resend */ 358 struct rack_fast_send_blk fsb; /* The fast-send block */ 359 uint32_t timer_slop; 360 uint32_t input_pkt; 361 uint32_t saved_input_pkt; 362 uint32_t rc_hpts_flags; 363 uint32_t rc_fixed_pacing_rate_ca; 364 uint32_t rc_fixed_pacing_rate_rec; 365 uint32_t rc_fixed_pacing_rate_ss; 366 uint32_t cwnd_to_use; /* The cwnd in use */ 367 uint32_t rc_timer_exp; /* If a timer ticks of expiry */ 368 uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */ 369 uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */ 370 371 /* Third Cache line 0x80 */ 372 struct rack_head rc_free; /* Allocation array */ 373 uint64_t last_hw_bw_req; 374 uint64_t crte_prev_rate; 375 uint64_t bw_rate_cap; 376 uint32_t rc_time_last_sent; /* Time we last sent some data and 377 * logged it Lock(a). */ 378 uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ 379 380 uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP 381 * Lock(a) */ 382 uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */ 383 384 uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */ 385 386 uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */ 387 388 uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ 389 uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */ 390 391 uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */ 392 uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */ 393 uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */ 394 395 uint32_t rc_loss_count; /* How many bytes have been retransmitted 396 * Lock(a) */ 397 uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ 398 399 /* Forth cache line 0xc0 */ 400 /* Times */ 401 402 uint32_t rc_rack_tmit_time; /* Rack transmit time Lock(a) */ 403 uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ 404 405 /* Variables to track bad retransmits and recover */ 406 uint32_t rc_rsm_start; /* RSM seq number we retransmitted Lock(a) */ 407 uint32_t rc_cwnd_at; /* cwnd at the retransmit Lock(a) */ 408 409 uint32_t rc_ssthresh_at;/* ssthresh at the retransmit Lock(a) */ 410 uint32_t rc_num_maps_alloced; /* Number of map blocks (sacks) we 411 * have allocated */ 412 uint32_t rc_rcvtime; /* When we last received data */ 413 uint32_t rc_num_split_allocs; /* num split map entries allocated */ 414 415 uint32_t rc_last_output_to; 416 uint32_t rc_went_idle_time; 417 418 struct rack_sendmap *rc_sacklast; /* sack remembered place 419 * Lock(a) */ 420 421 struct rack_sendmap *rc_rsm_at_retran; /* Debug variable kept for 422 * cache line alignment 423 * Lock(a) */ 424 struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */ 425 struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */ 426 /* Cache line split 0x100 */ 427 struct sack_filter rack_sf; 428 /* Cache line split 0x140 */ 429 /* Flags for various things */ 430 uint32_t last_pacing_time; 431 uint32_t rc_pace_max_segs; 432 uint32_t rc_pace_min_segs; 433 uint32_t rc_app_limited_cnt; 434 uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */ 435 uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */ 436 uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 437 uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 438 uint32_t rc_high_rwnd; 439 uint32_t ack_count; 440 uint32_t sack_count; 441 uint32_t sack_noextra_move; 442 uint32_t sack_moved_extra; 443 struct rack_rtt_sample rack_rs; 444 const struct tcp_hwrate_limit_table *crte; 445 uint32_t rc_agg_early; 446 uint32_t rc_agg_delayed; 447 uint32_t rc_tlp_rxt_last_time; 448 uint32_t rc_saved_cwnd; 449 uint64_t rc_gp_output_ts; /* chg*/ 450 uint64_t rc_gp_cumack_ts; /* chg*/ 451 struct timeval act_rcv_time; 452 struct timeval rc_last_time_decay; /* SAD time decay happened here */ 453 uint64_t gp_bw; 454 uint64_t init_rate; 455 #ifdef NETFLIX_SHARED_CWND 456 struct shared_cwnd *rc_scw; 457 #endif 458 uint64_t last_gp_comp_bw; 459 uint64_t last_max_bw; /* Our calculated max b/w last */ 460 struct time_filter_small rc_gp_min_rtt; 461 struct def_opt_head opt_list; 462 int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */ 463 uint32_t rc_gp_srtt; /* Current GP srtt */ 464 uint32_t rc_prev_gp_srtt; /* Previous RTT */ 465 uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */ 466 uint32_t rc_loss_at_start; /* At measurement window where was our lost value */ 467 468 uint32_t dsack_round_end; /* In a round of seeing a DSACK */ 469 uint32_t current_round; /* Starting at zero */ 470 uint32_t roundends; /* acked value above which round ends */ 471 uint32_t num_dsack; /* Count of dsack's seen (1 per window)*/ 472 uint32_t forced_ack_ts; 473 uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */ 474 uint32_t rc_time_probertt_entered; 475 uint32_t rc_time_probertt_starts; 476 uint32_t rc_lowest_us_rtt; 477 uint32_t rc_highest_us_rtt; 478 uint32_t rc_last_us_rtt; 479 uint32_t rc_time_of_last_probertt; 480 uint32_t rc_target_probertt_flight; 481 uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */ 482 uint32_t rc_cwnd_at_erec; 483 uint32_t rc_ssthresh_at_erec; 484 uint32_t dsack_byte_cnt; 485 uint32_t retran_during_recovery; 486 uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */ 487 uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */ 488 uint32_t rc_snd_max_at_rto; /* For non-sack when the RTO occured what was snd-max */ 489 uint32_t rc_out_at_rto; 490 int32_t rc_scw_index; 491 uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */ 492 uint32_t rc_last_timeout_snduna; 493 uint32_t last_tlp_acked_start; 494 uint32_t last_tlp_acked_end; 495 uint32_t challenge_ack_ts; 496 uint32_t challenge_ack_cnt; 497 uint32_t rc_min_to; /* Socket option value Lock(a) */ 498 uint32_t rc_pkt_delay; /* Socket option value Lock(a) */ 499 uint32_t persist_lost_ends; 500 struct newreno rc_saved_beta; /* 501 * For newreno cc: 502 * rc_saved_cc are the values we have had 503 * set by the user, if pacing is not happening 504 * (i.e. its early and we have not turned on yet 505 * or it was turned off). The minute pacing 506 * is turned on we pull out the values currently 507 * being used by newreno and replace them with 508 * these values, then save off the old values here, 509 * we also set the flag (if ecn_beta is set) to make 510 * new_reno do less of a backoff for ecn (think abe). 511 */ 512 uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */ 513 uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ 514 uint8_t dsack_persist; 515 uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */ 516 uint8_t num_measurements; /* Number of measurements (up to 0xff, we freeze at 0xff) */ 517 uint8_t req_measurements; /* How many measurements are required? */ 518 uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */ 519 uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */ 520 uint8_t rc_rate_sample_method; 521 uint8_t rc_gp_hist_idx; 522 }; 523 #endif 524 525 #define RACK_TIMELY_CNT_BOOST 5 /* At 5th increase boost */ 526 #define RACK_MINRTT_FILTER_TIM 10 /* Seconds */ 527 528 #ifdef _KERNEL 529 530 struct tcp_rack { 531 /* First cache line 0x00 */ 532 TAILQ_ENTRY(tcp_rack) r_hpts; /* hptsi queue next Lock(b) */ 533 int32_t(*r_substate) (struct mbuf *, struct tcphdr *, 534 struct socket *, struct tcpcb *, struct tcpopt *, 535 int32_t, int32_t, uint32_t, int, int, uint8_t); /* Lock(a) */ 536 struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ 537 struct inpcb *rc_inp; /* The inpcb Lock(a) */ 538 uint8_t rc_free_cnt; /* Number of free entries on the rc_free list 539 * Lock(a) */ 540 uint8_t client_bufferlvl; /* 0 - 5 normaly, less than or at 2 means its real low */ 541 uint8_t no_prr_addback : 1, 542 gp_ready : 1, 543 defer_options: 1, 544 fast_rsm_hack: 1, 545 rc_ack_can_sendout_data: 1, /* 546 * If set it will override pacing restrictions on not sending 547 * data when the pacing timer is running. I.e. you set this 548 * and an ACK will send data. Default is off and its only used 549 * without pacing when we are doing 5G speed up for there 550 * ack filtering. 551 */ 552 rc_pacing_cc_set: 1, /* 553 * If we are pacing (pace_always=1) and we have reached the 554 * point where we start pacing (fixed or gp has reached its 555 * magic gp_ready state) this flag indicates we have set in 556 * values to effect CC's backoff's. If pacing is turned off 557 * then we must restore the values saved in rc_saved_beta, 558 * if its going to gp_ready we need to copy the values into 559 * the CC module and set our flags. 560 * 561 * Note this only happens if the cc name is newreno (CCALGONAME_NEWRENO). 562 */ 563 564 rc_rack_tmr_std_based :1, 565 rc_rack_use_dsack: 1; 566 uint8_t rc_dsack_round_seen: 1, 567 rc_last_tlp_acked_set: 1, 568 rc_last_tlp_past_cumack: 1, 569 rc_last_sent_tlp_seq_valid: 1, 570 rc_last_sent_tlp_past_cumack: 1, 571 probe_not_answered: 1, 572 avail_bytes : 2; 573 uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */ 574 uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */ 575 rtt_limit_mul : 4, /* muliply this by low rtt */ 576 r_limit_scw : 1, 577 r_must_retran : 1, /* For non-sack customers we hit an RTO and new data should be resends */ 578 r_use_cmp_ack: 1, /* Do we use compressed acks */ 579 r_ent_rec_ns: 1, /* We entered recovery and have not sent */ 580 r_might_revert: 1, /* Flag to find out if we might need to revert */ 581 r_fast_output: 1, /* Fast output is in progress we can skip the bulk of rack_output */ 582 r_fsb_inited: 1, 583 r_rack_hw_rate_caps: 1, 584 r_up_only: 1, 585 r_via_fill_cw : 1, 586 r_fill_less_agg : 1; 587 588 uint8_t rc_user_set_max_segs; /* Socket option value Lock(a) */ 589 uint8_t rc_labc; /* Appropriate Byte Counting Value */ 590 uint16_t forced_ack : 1, 591 rc_gp_incr : 1, 592 rc_gp_bwred : 1, 593 rc_gp_timely_inc_cnt : 3, 594 rc_gp_timely_dec_cnt : 3, 595 r_use_labc_for_rec: 1, 596 rc_highly_buffered: 1, /* The path is highly buffered */ 597 rc_dragged_bottom: 1, 598 rc_dack_mode : 1, /* Mac O/S emulation of d-ack */ 599 rc_dack_toggle : 1, /* For Mac O/S emulation of d-ack */ 600 pacing_longer_than_rtt : 1, 601 rc_gp_filled : 1; 602 uint8_t r_state; /* Current rack state Lock(a) */ 603 uint8_t rc_tmr_stopped : 7, 604 t_timers_stopped : 1; 605 uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */ 606 rc_on_min_to : 1; 607 uint8_t r_timer_override : 1, /* hpts override Lock(a) */ 608 r_is_v6 : 1, /* V6 pcb Lock(a) */ 609 rc_in_persist : 1, 610 rc_tlp_in_progress : 1, 611 rc_always_pace : 1, /* Socket option value Lock(a) */ 612 rc_pace_to_cwnd : 1, 613 rc_pace_fill_if_rttin_range : 1, 614 rc_srtt_measure_made : 1; 615 uint8_t app_limited_needs_set : 1, 616 use_fixed_rate : 1, 617 rc_has_collapsed : 1, 618 r_rep_attack : 1, 619 r_rep_reverse : 1, 620 rack_hdrw_pacing : 1, /* We are doing Hardware pacing */ 621 rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */ 622 rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */ 623 uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */ 624 rack_rec_nonrxt_use_cr : 1, 625 rack_enable_scwnd : 1, 626 rack_attempted_scwnd : 1, 627 rack_no_prr : 1, 628 rack_scwnd_is_idle : 1; 629 uint8_t rc_allow_data_af_clo: 1, 630 delayed_ack : 1, 631 set_pacing_done_a_iw : 1, 632 use_rack_rr : 1, 633 alloc_limit_reported : 1, 634 sack_attack_disable : 1, 635 do_detection : 1, 636 rc_force_max_seg : 1; 637 uint8_t rack_cwnd_limited : 1, 638 r_early : 1, 639 r_late : 1, 640 r_running_early : 1, 641 r_running_late : 1, 642 r_wanted_output: 1, 643 r_rr_config : 2; 644 uint16_t rc_init_win : 8, 645 rc_gp_rtt_set : 1, 646 rc_gp_dyn_mul : 1, 647 rc_gp_saw_rec : 1, 648 rc_gp_saw_ca : 1, 649 rc_gp_saw_ss : 1, 650 rc_gp_no_rec_chg : 1, 651 in_probe_rtt : 1, 652 measure_saw_probe_rtt : 1; 653 /* Cache line 2 0x40 */ 654 struct rack_control r_ctl; 655 } __aligned(CACHE_LINE_SIZE); 656 657 #endif 658 #endif 659