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_WAS_LOST 0x400000/* Is the rsm considered lost */ 52#define RACK_IS_PCM 0x800000/* A PCM measurement is being taken */ 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 59struct 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 uint32_t r_act_rxt_cnt; /* The actual total count of transmits */ 69 struct mbuf *m; 70 uint32_t soff; 71 uint32_t orig_m_len; /* The original mbuf len when we sent (can update) */ 72 uint32_t orig_t_space; /* The original trailing space when we sent (can update) */ 73 uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */ 74 uint8_t r_dupack; /* Dup ack count */ 75 uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */ 76 uint8_t r_limit_type; /* is this entry counted against a limit? */ 77 uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */ 78 r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */ 79 r_no_rtt_allowed : 1, /* No rtt measurement allowed */ 80 r_hw_tls : 1, 81 r_avail : 4; 82 uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; 83 uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */ 84 uint32_t r_fas; /* Flight at send */ 85 uint8_t r_bas; /* The burst size (burst at send = bas) */ 86}; 87 88struct deferred_opt_list { 89 TAILQ_ENTRY(deferred_opt_list) next; 90 int optname; 91 uint64_t optval; 92}; 93 94/* 95 * Timestamps in the rack sendmap are now moving to be 96 * uint64_t's. This means that if you want a uint32_t 97 * usec timestamp (the old usecond timestamp) you simply have 98 * to cast it to uint32_t. The reason we do this is not for 99 * wrap, but we need to get back, at times, to the millisecond 100 * timestamp that is used in the TSTMP option. To do this we 101 * can use the rack_ts_to_msec() inline below which can take 102 * the 64bit ts and make into the correct timestamp millisecond 103 * wise. Thats not possible with the 32bit usecond timestamp since 104 * the seconds wrap too quickly to cover all bases. 105 * 106 * There are quite a few places in rack where I simply cast 107 * back to uint32_t and then end up using the TSTMP_XX() 108 * macros. This is ok, but we could do simple compares if 109 * we ever decided to move all of those variables to 64 bits 110 * as well. 111 */ 112 113static inline uint64_t 114rack_to_usec_ts(struct timeval *tv) 115{ 116 return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec); 117} 118 119static inline uint32_t 120rack_ts_to_msec(uint64_t ts) 121{ 122 return((uint32_t)(ts / HPTS_MSEC_IN_SEC)); 123} 124 125 126TAILQ_HEAD(rack_head, rack_sendmap); 127TAILQ_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 */ 152struct 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#define RCV_PATH_RTT_MS 10 /* How many ms between recv path RTT's */ 181 182struct rack_opts_stats { 183 uint64_t tcp_rack_tlp_reduce; 184 uint64_t tcp_rack_pace_always; 185 uint64_t tcp_rack_pace_reduce; 186 uint64_t tcp_rack_max_seg; 187 uint64_t tcp_rack_prr_sendalot; 188 uint64_t tcp_rack_min_to; 189 uint64_t tcp_rack_early_seg; 190 uint64_t tcp_rack_reord_thresh; 191 uint64_t tcp_rack_reord_fade; 192 uint64_t tcp_rack_tlp_thresh; 193 uint64_t tcp_rack_pkt_delay; 194 uint64_t tcp_rack_tlp_inc_var; 195 uint64_t tcp_tlp_use; 196 uint64_t tcp_rack_idle_reduce; 197 uint64_t tcp_rack_idle_reduce_high; 198 uint64_t rack_no_timer_in_hpts; 199 uint64_t tcp_rack_min_pace_seg; 200 uint64_t tcp_rack_pace_rate_ca; 201 uint64_t tcp_rack_rr; 202 uint64_t tcp_rack_rrr_no_conf_rate; 203 uint64_t tcp_initial_rate; 204 uint64_t tcp_initial_win; 205 uint64_t tcp_hdwr_pacing; 206 uint64_t tcp_gp_inc_ss; 207 uint64_t tcp_gp_inc_ca; 208 uint64_t tcp_gp_inc_rec; 209 uint64_t tcp_rack_force_max_seg; 210 uint64_t tcp_rack_pace_rate_ss; 211 uint64_t tcp_rack_pace_rate_rec; 212 /* Temp counters for dsack */ 213 uint64_t tcp_sack_path_1; /* not used */ 214 uint64_t tcp_sack_path_2a; /* not used */ 215 uint64_t tcp_sack_path_2b; /* not used */ 216 uint64_t tcp_sack_path_3; /* not used */ 217 uint64_t tcp_sack_path_4; /* not used */ 218 /* non temp counters */ 219 uint64_t tcp_rack_scwnd; 220 uint64_t tcp_rack_noprr; 221 uint64_t tcp_rack_cfg_rate; 222 uint64_t tcp_timely_dyn; 223 uint64_t tcp_rack_mbufq; 224 uint64_t tcp_fillcw; 225 uint64_t tcp_npush; 226 uint64_t tcp_lscwnd; 227 uint64_t tcp_profile; 228 uint64_t tcp_hdwr_rate_cap; 229 uint64_t tcp_pacing_rate_cap; 230 uint64_t tcp_pacing_up_only; 231 uint64_t tcp_use_cmp_acks; 232 uint64_t tcp_rack_abc_val; 233 uint64_t tcp_rec_abc_val; 234 uint64_t tcp_rack_measure_cnt; 235 uint64_t tcp_rack_delayed_ack; 236 uint64_t tcp_rack_rtt_use; 237 uint64_t tcp_data_after_close; 238 uint64_t tcp_defer_opt; 239 uint64_t tcp_pol_detect; 240 uint64_t tcp_rack_beta; 241 uint64_t tcp_rack_beta_ecn; 242 uint64_t tcp_rack_timer_slop; 243 uint64_t tcp_rack_dsack_opt; 244 uint64_t tcp_rack_hi_beta; 245 uint64_t tcp_split_limit; 246 uint64_t tcp_rack_pacing_divisor; 247 uint64_t tcp_rack_min_seg; 248 uint64_t tcp_dgp_in_rec; 249 uint64_t tcp_notimely; 250 uint64_t tcp_honor_hpts; 251 uint64_t tcp_dyn_rec; 252 uint64_t tcp_fillcw_rate_cap; 253 uint64_t tcp_pol_mss; 254}; 255 256/* RTT shrink reasons */ 257#define RACK_RTTS_INIT 0 258#define RACK_RTTS_NEWRTT 1 259#define RACK_RTTS_EXITPROBE 2 260#define RACK_RTTS_ENTERPROBE 3 261#define RACK_RTTS_REACHTARGET 4 262#define RACK_RTTS_SEEHBP 5 263#define RACK_RTTS_NOBACKOFF 6 264#define RACK_RTTS_SAFETY 7 265 266#define RACK_USE_BEG 1 267#define RACK_USE_END 2 268#define RACK_USE_END_OR_THACK 3 269 270#define TLP_USE_ID 1 /* Internet draft behavior */ 271#define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */ 272#define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */ 273#define RACK_MIN_BW 8000 /* 64kbps in Bps */ 274 275#define CCSP_DIS_MASK 0x0001 276#define HYBRID_DIS_MASK 0x0002 277 278/* Rack quality indicators for GPUT measurements */ 279#define RACK_QUALITY_NONE 0 /* No quality stated */ 280#define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */ 281#define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */ 282#define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */ 283#define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */ 284#define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */ 285 286#define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */ 287#ifdef _KERNEL 288#define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t)) 289extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; 290#define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm)) 291#define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1) 292#endif 293/* 294 * As we get each SACK we wade through the 295 * rc_map and mark off what is acked. 296 * We also increment rc_sacked as well. 297 * 298 * We also pay attention to missing entries 299 * based on the time and possibly mark them 300 * for retransmit. If we do and we are not already 301 * in recovery we enter recovery. In doing 302 * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. 303 * We also setup rc_next/rc_snd_nxt/rc_send_end so 304 * we will know where to send from. When not in 305 * recovery rc_next will be NULL and rc_snd_nxt should 306 * equal snd_max. 307 * 308 * Whenever we retransmit from recovery we increment 309 * rc_holes_rxt as we retran a block and mark it as retransmitted 310 * with the time it was sent. During non-recovery sending we 311 * add to our map and note the time down of any send expanding 312 * the rc_map at the tail and moving rc_snd_nxt up with snd_max. 313 * 314 * In recovery during SACK/ACK processing if a chunk has 315 * been retransmitted and it is now acked, we decrement rc_holes_rxt. 316 * When we retransmit from the scoreboard we use 317 * rc_next and rc_snd_nxt/rc_send_end to help us 318 * find what needs to be retran. 319 * 320 * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt 321 * This gets us the effect of RFC6675 pipe, counting twice for 322 * bytes retransmitted. 323 */ 324 325#define TT_RACK_FR_TMR 0x2000 326 327/* 328 * Locking for the rack control block. 329 * a) Locked by INP_WLOCK 330 * b) Locked by the hpts-mutex 331 * 332 */ 333#define RACK_GP_HIST 4 /* How much goodput history do we maintain? */ 334#define RETRAN_CNT_SIZE 16 335 336#define RACK_NUM_FSB_DEBUG 16 337#ifdef _KERNEL 338struct rack_fast_send_blk { 339 uint32_t left_to_send; 340 uint16_t tcp_ip_hdr_len; 341 uint8_t tcp_flags; 342 uint8_t hoplimit; 343 uint8_t *tcp_ip_hdr; 344 uint32_t recwin; 345 uint32_t off; 346 struct tcphdr *th; 347 struct udphdr *udp; 348 struct mbuf *m; 349 uint32_t o_m_len; 350 uint32_t o_t_len; 351 uint32_t rfo_apply_push : 1, 352 hw_tls : 1, 353 unused : 30; 354}; 355 356struct tailq_hash; 357 358struct rack_pcm_info { 359 /* Base send time and s/e filled in by rack_log_output */ 360 uint64_t send_time; 361 uint32_t sseq; 362 uint32_t eseq; 363 /* Ack's fill in the rest of the data */ 364 uint16_t cnt; 365 /* Maximum acks present */ 366 uint16_t cnt_alloc; 367}; 368 369#define RACK_DEFAULT_PCM_ARRAY 16 370 371struct rack_pcm_stats { 372 uint32_t sseq; 373 uint32_t eseq; 374 uint64_t ack_time; 375}; 376 377 378struct rack_control { 379 /* Second cache line 0x40 from tcp_rack */ 380 struct tailq_hash *tqh; /* Tree of all segments Lock(a) */ 381 struct rack_head rc_tmap; /* List in transmit order Lock(a) */ 382 struct rack_sendmap *rc_tlpsend; /* Remembered place for 383 * tlp_sending Lock(a) */ 384 struct rack_sendmap *rc_resend; /* something we have been asked to 385 * resend */ 386 struct rack_fast_send_blk fsb; /* The fast-send block */ 387 uint32_t timer_slop; 388 uint16_t pace_len_divisor; 389 uint16_t rc_user_set_min_segs; 390 uint32_t rc_hpts_flags; 391 uint32_t rc_fixed_pacing_rate_ca; 392 uint32_t rc_fixed_pacing_rate_rec; 393 uint32_t rc_fixed_pacing_rate_ss; 394 uint32_t cwnd_to_use; /* The cwnd in use */ 395 uint32_t rc_timer_exp; /* If a timer ticks of expiry */ 396 uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */ 397 uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */ 398 399 /* Third Cache line 0x80 */ 400 struct rack_head rc_free; /* Allocation array */ 401 uint64_t last_hw_bw_req; 402 uint64_t crte_prev_rate; 403 uint64_t bw_rate_cap; 404 uint64_t last_cumack_advance; /* Last time cumack moved forward */ 405 uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ 406 407 uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP 408 * Lock(a) */ 409 uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */ 410 411 uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */ 412 413 uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */ 414 415 uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ 416 uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */ 417 418 uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */ 419 420 uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */ 421 uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */ 422 423 uint32_t rc_loss_count; /* How many bytes have been retransmitted 424 * Lock(a) */ 425 uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ 426 427 /* Forth cache line 0xc0 */ 428 /* Times */ 429 430 uint32_t rc_rack_tmit_time; /* Rack transmit time Lock(a) */ 431 uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ 432 433 uint32_t rc_num_maps_alloced; /* Number of map blocks (sacks) we 434 * have allocated */ 435 uint32_t rc_rcvtime; /* When we last received data */ 436 uint32_t rc_num_split_allocs; /* num split map entries allocated */ 437 uint32_t rc_split_limit; /* Limit from control var can be set by socket opt */ 438 uint32_t rack_avg_rec_sends; 439 440 uint32_t rc_last_output_to; 441 uint32_t rc_went_idle_time; 442 443 struct rack_sendmap *rc_sacklast; /* sack remembered place 444 * Lock(a) */ 445 446 struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */ 447 struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */ 448 /* Cache line split 0x100 */ 449 struct sack_filter rack_sf; 450 /* Cache line split 0x140 */ 451 /* Flags for various things */ 452 uint32_t rc_pace_max_segs; 453 uint32_t rc_pace_min_segs; 454 uint32_t rc_app_limited_cnt; 455 uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */ 456 uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */ 457 uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 458 uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */ 459 uint32_t rc_high_rwnd; 460 struct rack_rtt_sample rack_rs; 461 const struct tcp_hwrate_limit_table *crte; 462 uint32_t rc_agg_early; 463 uint32_t rc_agg_delayed; 464 uint32_t rc_tlp_rxt_last_time; 465 uint32_t rc_saved_cwnd; 466 uint64_t rc_gp_output_ts; /* chg*/ 467 uint64_t rc_gp_cumack_ts; /* chg*/ 468 struct timeval act_rcv_time; 469 struct timeval rc_last_time_decay; /* SAD time decay happened here */ 470 uint64_t gp_bw; 471 uint64_t init_rate; 472#ifdef NETFLIX_SHARED_CWND 473 struct shared_cwnd *rc_scw; 474#endif 475 uint64_t last_gp_comp_bw; 476 uint64_t last_max_bw; /* Our calculated max b/w last */ 477 struct time_filter_small rc_gp_min_rtt; 478 struct def_opt_head opt_list; 479 uint64_t lt_bw_time; /* Total time with data outstanding (lt_bw = long term bandwidth) */ 480 uint64_t lt_bw_bytes; /* Total bytes acked */ 481 uint64_t lt_timemark; /* 64 bit timestamp when we started sending */ 482 struct tcp_sendfile_track *rc_last_sft; 483 uint32_t lt_seq; /* Seq at start of lt_bw gauge */ 484 int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */ 485 uint64_t last_tmit_time_acked; /* Holds the last cumack point's last send time */ 486 /* Recovery stats */ 487 uint64_t time_entered_recovery; 488 uint64_t bytes_acked_in_recovery; 489 /* Policer Detection */ 490 uint64_t last_policer_sndbytes; 491 uint64_t last_policer_snd_rxt_bytes; 492 uint64_t policer_bw; 493 uint64_t last_sendtime; 494 495 uint64_t last_gpest; 496 uint64_t last_tm_mark; /* Last tm mark used */ 497 uint64_t fillcw_cap; /* B/W cap on fill cw */ 498 struct rack_pcm_info pcm_i; 499 struct rack_pcm_stats *pcm_s; 500 uint32_t gp_gain_req; /* Percent off gp gain req */ 501 uint32_t last_rnd_of_gp_rise; 502 uint32_t gp_rnd_thresh; 503 uint32_t ss_hi_fs; 504 uint32_t gate_to_fs; 505 uint32_t policer_max_seg; 506 uint32_t pol_bw_comp; 507 uint16_t policer_rxt_threshold; 508 uint8_t policer_avg_threshold; 509 uint8_t policer_med_threshold; 510 uint32_t pcm_max_seg; 511 uint32_t last_pcm_round; 512 uint32_t pcm_idle_rounds; 513 uint32_t current_policer_bucket; 514 uint32_t policer_bucket_size; 515 uint32_t idle_snd_una; 516 uint32_t ack_for_idle; 517 uint32_t last_amount_before_rec; 518 519 uint32_t rc_gp_srtt; /* Current GP srtt */ 520 uint32_t rc_prev_gp_srtt; /* Previous RTT */ 521 uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */ 522 uint32_t rc_loss_at_start; /* At measurement window where was our lost value */ 523 uint32_t rc_considered_lost; /* Count in recovery of non-retransmitted bytes considered lost */ 524 525 uint32_t dsack_round_end; /* In a round of seeing a DSACK */ 526 uint32_t current_round; /* Starting at zero */ 527 uint32_t roundends; /* acked value above which round ends */ 528 uint32_t num_dsack; /* Count of dsack's seen (1 per window)*/ 529 uint32_t forced_ack_ts; 530 uint32_t last_collapse_point; /* Last point peer collapsed too */ 531 uint32_t high_collapse_point; 532 uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */ 533 uint32_t rc_time_probertt_entered; 534 uint32_t rc_time_probertt_starts; 535 uint32_t rc_lowest_us_rtt; 536 uint32_t rc_highest_us_rtt; 537 uint32_t rc_last_us_rtt; 538 uint32_t rc_time_of_last_probertt; 539 uint32_t rc_target_probertt_flight; 540 uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */ 541 uint32_t rc_cwnd_at_erec; 542 uint32_t rc_ssthresh_at_erec; 543 uint32_t dsack_byte_cnt; 544 uint32_t retran_during_recovery; 545 uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */ 546 uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */ 547 uint32_t rc_snd_max_at_rto; /* For non-sack when the RTO occurred what was snd-max */ 548 uint32_t rc_out_at_rto; 549 int32_t rc_scw_index; 550 uint32_t max_reduction; 551 uint32_t side_chan_dis_mask; /* Bit mask of socket opt's disabled */ 552 uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */ 553 uint32_t rc_last_timeout_snduna; 554 uint32_t last_tlp_acked_start; 555 uint32_t last_tlp_acked_end; 556 uint32_t challenge_ack_ts; 557 uint32_t challenge_ack_cnt; 558 uint32_t rc_min_to; /* Socket option value Lock(a) */ 559 uint32_t rc_pkt_delay; /* Socket option value Lock(a) */ 560 uint32_t persist_lost_ends; 561 uint32_t input_pkt; 562 uint32_t saved_input_pkt; 563 uint32_t saved_policer_val; /* The encoded value we used to setup policer detection */ 564 uint32_t cleared_app_ack_seq; 565 uint32_t last_rcv_tstmp_for_rtt; 566 uint32_t last_time_of_arm_rcv; 567 uint32_t rto_ssthresh; 568 struct newreno rc_saved_beta; /* 569 * For newreno cc: 570 * rc_saved_cc are the values we have had 571 * set by the user, if pacing is not happening 572 * (i.e. its early and we have not turned on yet 573 * or it was turned off). The minute pacing 574 * is turned on we pull out the values currently 575 * being used by newreno and replace them with 576 * these values, then save off the old values here, 577 * we also set the flag (if ecn_beta is set) to make 578 * new_reno do less of a backoff for ecn (think abe). 579 */ 580 uint16_t rc_cnt_of_retran[RETRAN_CNT_SIZE]; 581 uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */ 582 uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ 583 uint8_t policer_del_mss; /* How many mss during recovery for policer detection */ 584 uint8_t rack_per_upper_bound_ss; 585 uint8_t rack_per_upper_bound_ca; 586 uint8_t cleared_app_ack; 587 uint8_t dsack_persist; 588 uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */ 589 uint8_t num_measurements; /* Number of measurements (up to 0xff, we freeze at 0xff) */ 590 uint8_t req_measurements; /* How many measurements are required? */ 591 uint8_t saved_hibeta; 592 uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */ 593 uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */ 594 uint8_t rc_rate_sample_method; 595 uint8_t policer_alt_median; /* Alternate median for policer detection */ 596 uint8_t full_dgp_in_rec; /* Flag to say if we do full DGP in recovery */ 597 uint8_t client_suggested_maxseg; /* Not sure what to do with this yet */ 598 uint8_t use_gp_not_last; 599 uint8_t pacing_method; /* If pace_always, what type of pacing */ 600 uint8_t already_had_a_excess; 601}; 602#endif 603 604#define RACK_PACING_NONE 0x00 605#define RACK_DGP_PACING 0x01 606#define RACK_REG_PACING 0x02 607 608/* DGP with no buffer level mitigations */ 609#define DGP_LEVEL0 0 610 611/* 612 * DGP with buffer level mitigation where BL:4 caps fillcw and BL:5 613 * turns off fillcw. 614 */ 615#define DGP_LEVEL1 1 616 617/* 618 * DGP with buffer level mitigation where BL:3 caps fillcw and BL:4 turns off fillcw 619 * and BL:5 reduces by 10% 620 */ 621#define DGP_LEVEL2 2 622 623/* 624 * DGP with buffer level mitigation where BL:2 caps fillcw and BL:3 turns off 625 * fillcw BL:4 reduces by 10% and BL:5 reduces by 20% 626 */ 627#define DGP_LEVEL3 3 628 629/* Hybrid pacing log defines */ 630#define HYBRID_LOG_NO_ROOM 0 /* No room for the clients request */ 631#define HYBRID_LOG_TURNED_OFF 1 /* Turned off hybrid pacing */ 632#define HYBRID_LOG_NO_PACING 2 /* Failed to set pacing on */ 633#define HYBRID_LOG_RULES_SET 3 /* Hybrid pacing for this chunk is set */ 634#define HYBRID_LOG_NO_RANGE 4 /* In DGP mode, no range found */ 635#define HYBRID_LOG_RULES_APP 5 /* The specified rules were applied */ 636#define HYBRID_LOG_REQ_COMP 6 /* The request completed */ 637#define HYBRID_LOG_BW_MEASURE 7 /* Follow up b/w measurements to the previous completed log */ 638#define HYBRID_LOG_RATE_CAP 8 /* We had a rate cap apply */ 639#define HYBRID_LOG_CAP_CALC 9 /* How we calculate the cap */ 640#define HYBRID_LOG_ISSAME 10 /* Same as before -- temp */ 641#define HYBRID_LOG_ALLSENT 11 /* We sent it all no more rate-cap */ 642#define HYBRID_LOG_OUTOFTIME 12 /* We are past the deadline DGP */ 643#define HYBRID_LOG_CAPERROR 13 /* Hit one of the TSNH cases */ 644#define HYBRID_LOG_EXTEND 14 /* We extended the end */ 645#define HYBRID_LOG_SENT_LOST 15 /* A closing sent/lost report */ 646 647#define LOST_ZERO 1 /* Zero it out */ 648#define LOST_ADD 2 /* Add to it */ 649#define LOST_SUB 3 /* Sub from it */ 650 651#define RACK_TIMELY_CNT_BOOST 5 /* At 5th increase boost */ 652#define RACK_MINRTT_FILTER_TIM 10 /* Seconds */ 653 654#define RACK_HYSTART_OFF 0 655#define RACK_HYSTART_ON 1 /* hystart++ on */ 656#define RACK_HYSTART_ON_W_SC 2 /* hystart++ on +Slam Cwnd */ 657#define RACK_HYSTART_ON_W_SC_C 3 /* hystart++ on, 658 * Conservative ssthresh and 659 * +Slam cwnd 660 */ 661 662#define MAX_USER_SET_SEG 0x3f /* The max we can set is 63 which is probably too many */ 663#define RACK_FREE_CNT_MAX 0x2f /* Max our counter can do */ 664 665#ifdef _KERNEL 666 667struct tcp_rack { 668 /* First cache line 0x00 */ 669 TAILQ_ENTRY(tcp_rack) r_hpts; /* hptsi queue next Lock(b) */ 670 int32_t(*r_substate) (struct mbuf *, struct tcphdr *, 671 struct socket *, struct tcpcb *, struct tcpopt *, 672 int32_t, int32_t, uint32_t, int, int, uint8_t); /* Lock(a) */ 673 struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ 674 struct inpcb *rc_inp; /* The inpcb Lock(a) */ 675 uint8_t rc_free_cnt : 6, 676 rc_skip_timely : 1, 677 pcm_enabled : 1; /* Is PCM enabled */ 678 uint8_t client_bufferlvl : 3, /* Expected range [0,5]: 0=unset, 1=low/empty */ 679 rack_deferred_inited : 1, 680 /* ******************************************************************** */ 681 /* Note for details of next two fields see rack_init_retransmit_rate() */ 682 /* ******************************************************************** */ 683 full_size_rxt: 1, 684 shape_rxt_to_pacing_min : 1, 685 /* ******************************************************************** */ 686 rc_ack_required: 1, 687 r_use_hpts_min : 1; 688 uint8_t no_prr_addback : 1, 689 gp_ready : 1, 690 defer_options: 1, 691 dis_lt_bw : 1, 692 rc_ack_can_sendout_data: 1, /* 693 * If set it will override pacing restrictions on not sending 694 * data when the pacing timer is running. I.e. you set this 695 * and an ACK will send data. Default is off and its only used 696 * without pacing when we are doing 5G speed up for there 697 * ack filtering. 698 */ 699 rc_pacing_cc_set: 1, /* 700 * If we are pacing (pace_always=1) and we have reached the 701 * point where we start pacing (fixed or gp has reached its 702 * magic gp_ready state) this flag indicates we have set in 703 * values to effect CC's backoff's. If pacing is turned off 704 * then we must restore the values saved in rc_saved_beta, 705 * if its going to gp_ready we need to copy the values into 706 * the CC module and set our flags. 707 * 708 * Note this only happens if the cc name is newreno (CCALGONAME_NEWRENO). 709 */ 710 711 rc_rack_tmr_std_based :1, 712 rc_rack_use_dsack: 1; 713 uint8_t rc_dsack_round_seen: 1, 714 rc_last_tlp_acked_set: 1, 715 rc_last_tlp_past_cumack: 1, 716 rc_last_sent_tlp_seq_valid: 1, 717 rc_last_sent_tlp_past_cumack: 1, 718 probe_not_answered: 1, 719 rack_hibeta : 1, 720 lt_bw_up : 1; 721 uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */ 722 uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */ 723 rtt_limit_mul : 4, /* muliply this by low rtt */ 724 r_limit_scw : 1, 725 r_must_retran : 1, /* For non-sack customers we hit an RTO and new data should be resends */ 726 r_use_cmp_ack: 1, /* Do we use compressed acks */ 727 r_ent_rec_ns: 1, /* We entered recovery and have not sent */ 728 r_might_revert: 1, /* Flag to find out if we might need to revert */ 729 r_fast_output: 1, /* Fast output is in progress we can skip the bulk of rack_output */ 730 r_fsb_inited: 1, 731 r_rack_hw_rate_caps: 1, 732 r_up_only: 1, 733 r_via_fill_cw : 1, 734 r_rcvpath_rtt_up : 1; 735 736 uint8_t rc_user_set_max_segs : 7, /* Socket option value Lock(a) */ 737 rc_fillcw_apply_discount; 738 uint8_t rc_labc; /* Appropriate Byte Counting Value */ 739 uint16_t forced_ack : 1, 740 rc_gp_incr : 1, 741 rc_gp_bwred : 1, 742 rc_gp_timely_inc_cnt : 3, 743 rc_gp_timely_dec_cnt : 3, 744 r_use_labc_for_rec: 1, 745 rc_highly_buffered: 1, /* The path is highly buffered */ 746 rc_dragged_bottom: 1, 747 rc_pace_dnd : 1, /* The pace do not disturb bit */ 748 rc_initial_ss_comp : 1, 749 rc_gp_filled : 1, 750 rc_hw_nobuf : 1; 751 uint8_t r_state : 4, /* Current rack state Lock(a) */ 752 rc_catch_up : 1, /* catch up mode in dgp */ 753 rc_hybrid_mode : 1, /* We are in hybrid mode */ 754 rc_suspicious : 1, /* Suspect sacks have been given */ 755 rc_new_rnd_needed: 1; 756 uint8_t rc_tmr_stopped : 7, 757 t_timers_stopped : 1; 758 uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */ 759 rc_on_min_to : 1; 760 uint8_t r_timer_override : 1, /* hpts override Lock(a) */ 761 r_is_v6 : 1, /* V6 pcb Lock(a) */ 762 rc_in_persist : 1, 763 rc_tlp_in_progress : 1, 764 rc_always_pace : 1, /* Socket option value Lock(a) */ 765 rc_pace_to_cwnd : 1, 766 rc_pace_fill_if_rttin_range : 1, 767 rc_srtt_measure_made : 1; 768 uint8_t app_limited_needs_set : 1, 769 use_fixed_rate : 1, 770 rc_has_collapsed : 1, 771 use_lesser_lt_bw : 1, 772 cspr_is_fcc : 1, 773 rack_hdrw_pacing : 1, /* We are doing Hardware pacing */ 774 rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */ 775 rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */ 776 uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */ 777 rack_rec_nonrxt_use_cr : 1, 778 rack_enable_scwnd : 1, 779 rack_attempted_scwnd : 1, 780 rack_no_prr : 1, 781 rack_scwnd_is_idle : 1; 782 uint8_t rc_allow_data_af_clo: 1, 783 delayed_ack : 1, 784 set_pacing_done_a_iw : 1, 785 use_rack_rr : 1, 786 alloc_limit_reported : 1, 787 rack_avail : 2, 788 rc_force_max_seg : 1; 789 uint8_t r_early : 1, 790 r_late : 1, 791 r_wanted_output: 1, 792 r_rr_config : 2, 793 r_persist_lt_bw_off : 1, 794 r_collapse_point_valid : 1, 795 dgp_on : 1; 796 uint16_t rto_from_rec: 1, 797 avail_bit: 1, 798 pcm_in_progress: 1, 799 pcm_needed: 1, 800 policer_detect_on: 1, /* Are we detecting policers? */ 801 rc_policer_detected : 1, /* We are beiing policed */ 802 rc_policer_should_pace : 1, /* The sizing algo thinks we should pace */ 803 rc_sendvars_notset : 1, /* Inside rack_init send variables (snd_max/una etc) were not set */ 804 rc_gp_rtt_set : 1, 805 rc_gp_dyn_mul : 1, 806 rc_gp_saw_rec : 1, 807 rc_gp_saw_ca : 1, 808 rc_gp_saw_ss : 1, 809 rc_gp_no_rec_chg : 1, 810 in_probe_rtt : 1, 811 measure_saw_probe_rtt : 1; 812 /* Cache line 2 0x40 */ 813 struct rack_control r_ctl; 814} __aligned(CACHE_LINE_SIZE); 815 816 817void rack_update_pcm_ack(struct tcp_rack *rack, int was_cumack, 818 uint32_t ss, uint32_t es); 819 820#endif 821#endif 822