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rack_bbr_common.h
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sack_filter.h
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tcp_bbr.h
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tcp_rack.h
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Editing: tcp_bbr.h
/*- * Copyright (c) 2016-2020 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _NETINET_TCP_BBR_H_ #define _NETINET_TCP_BBR_H_ #define BBR_INITIAL_RTO 1000000 /* 1 second in micro-seconds */ /* Send map flags */ #define BBR_ACKED 0x0001 /* The remote endpoint acked this */ #define BBR_WAS_RENEGED 0x0002 /* The peer reneged the ack */ #define BBR_RXT_CLEARED 0x0004 /* ACK Cleared by the RXT timer */ #define BBR_OVERMAX 0x0008 /* We have more retran's then we can * fit */ #define BBR_SACK_PASSED 0x0010 /* A sack was done above this block */ #define BBR_WAS_SACKPASS 0x0020 /* We retransmitted due to SACK pass */ #define BBR_HAS_FIN 0x0040 /* segment is sent with fin */ #define BBR_TLP 0x0080 /* segment sent as tail-loss-probe */ #define BBR_HAS_SYN 0x0100 /* segment has the syn */ #define BBR_MARKED_LOST 0x0200 /* * This segments is lost and * totaled into bbr->rc_ctl.rc_lost */ #define BBR_RWND_COLLAPSED 0x0400 /* The peer collapsed the rwnd on the segment */ #define BBR_NUM_OF_RETRANS 7 /* Defines for socket options to set pacing overheads */ #define BBR_INCL_ENET_OH 0x01 #define BBR_INCL_IP_OH 0x02 #define BBR_INCL_TCP_OH 0x03 /* * With the addition of both measurement algorithms * I had to move over the size of a * cache line (unfortunately). For now there is * no way around this. We may be able to cut back * at some point I hope. */ struct bbr_sendmap { TAILQ_ENTRY(bbr_sendmap) r_next; /* seq number arrayed next */ TAILQ_ENTRY(bbr_sendmap) r_tnext; /* Time of tmit based next */ uint32_t r_start; /* Sequence number of the segment */ uint32_t r_end; /* End seq, this is 1 beyond actually */ uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ uint32_t r_delivered; /* Delivered amount at send */ uint32_t r_del_time; /* The time of the last delivery update */ uint8_t r_rtr_cnt:4, /* Retran count, index this -1 to get time * sent */ unused_bit:1, r_is_drain:1, /* In a draining cycle */ r_app_limited:1,/* We went app limited */ r_ts_valid:1; /* Timestamp field is valid (r_del_ack_ts) */ uint8_t r_dupack; /* Dup ack count */ uint8_t r_in_tmap:1, /* Flag to see if its in the r_tnext array */ r_is_smallmap:1,/* Was logged as a small-map send-map item */ r_is_gain:1, /* Was in gain cycle */ r_bbr_state:5; /* The BBR state at send */ uint8_t r_limit_type; /* is this entry counted against a limit? */ uint16_t r_flags; /* Flags as defined above */ uint16_t r_spare16; uint32_t r_del_ack_ts; /* At send what timestamp of peer was (if r_ts_valid set) */ /****************Cache line*****************/ uint32_t r_tim_lastsent[BBR_NUM_OF_RETRANS]; /* * Question, should we instead just grab the sending b/w * from the filter with the gain and store it in a * uint64_t instead? */ uint32_t r_first_sent_time; /* Time of first pkt in flight sent */ uint32_t r_pacing_delay; /* pacing delay of this send */ uint32_t r_flight_at_send; /* flight at the time of the send */ #ifdef _KERNEL } __aligned(CACHE_LINE_SIZE); #else }; #endif #define BBR_LIMIT_TYPE_SPLIT 1 TAILQ_HEAD(bbr_head, bbr_sendmap); #define BBR_SEGMENT_TIME_SIZE 1500 /* How many bytes in time_between */ #define BBR_MIN_SEG 1460 /* MSS size */ #define BBR_MAX_GAIN_VALUE 0xffff #define BBR_TIMER_FUDGE 1500 /* 1.5ms in micro seconds */ /* BW twiddle secret codes */ #define BBR_RED_BW_CONGSIG 0 /* We enter recovery and set using b/w */ #define BBR_RED_BW_RATECAL 1 /* We are calculating the loss rate */ #define BBR_RED_BW_USELRBW 2 /* We are dropping the lower b/w with * cDR */ #define BBR_RED_BW_SETHIGHLOSS 3 /* We have set our highloss value at * exit from probe-rtt */ #define BBR_RED_BW_PE_CLREARLY 4 /* We have decided to clear the * reduction early */ #define BBR_RED_BW_PE_CLAFDEL 5 /* We are clearing it on schedule * delayed */ #define BBR_RED_BW_REC_ENDCLL 6 /* Recover exits save high if needed * an clear to start measuring */ #define BBR_RED_BW_PE_NOEARLY_OUT 7 /* Set pkt epoch judged that we do not * get out of jail early */ /* For calculating a rate */ #define BBR_CALC_BW 1 #define BBR_CALC_LOSS 2 #define BBR_RTT_BY_TIMESTAMP 0 #define BBR_RTT_BY_EXACTMATCH 1 #define BBR_RTT_BY_EARLIER_RET 2 #define BBR_RTT_BY_THIS_RETRAN 3 #define BBR_RTT_BY_SOME_RETRAN 4 #define BBR_RTT_BY_TSMATCHING 5 /* Markers to track where we enter persists from */ #define BBR_PERSISTS_FROM_1 1 #define BBR_PERSISTS_FROM_2 2 #define BBR_PERSISTS_FROM_3 3 #define BBR_PERSISTS_FROM_4 4 #define BBR_PERSISTS_FROM_5 5 /* magic cookies to ask for the RTT */ #define BBR_RTT_PROP 0 #define BBR_RTT_RACK 1 #define BBR_RTT_PKTRTT 2 #define BBR_SRTT 3 #define BBR_SACKED 0 #define BBR_CUM_ACKED 1 /* threshold in useconds where we consider we need a higher min cwnd */ #define BBR_HIGH_SPEED 1000 #define BBR_HIGHSPEED_NUM_MSS 12 #define MAX_REDUCE_RXT 3 /* What is the maximum times we are willing to * reduce b/w in RTX's. Setting this has a * multiplicative effect e.g. if we are * reducing by 20% then setting it to 3 means * you will have reduced the b/w estimate by > * 60% before you stop. */ /* * We use the rate sample structure to * assist in single sack/ack rate and rtt * calculation. In the future we will expand * this in BBR to do forward rate sample * b/w estimation. */ #define BBR_RS_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ #define BBR_RS_BW_EMPTY 0x00000002 /* Nothing yet stored in cDR */ #define BBR_RS_RTT_VALID 0x00000004 /* We have at least one valid RTT */ #define BBR_RS_BW_VAILD 0x00000008 /* We have a valid cDR */ #define BBR_RS_EMPTY (BBR_RS_RTT_EMPTY|BBR_RS_BW_EMPTY) struct bbr_rtt_sample { uint32_t rs_flags; uint32_t rs_rtt_lowest; uint32_t rs_rtt_lowest_sendtime; uint32_t rs_rtt_low_seq_start; uint32_t rs_rtt_highest; uint32_t rs_rtt_cnt; uint64_t rs_rtt_tot; uint32_t cur_rtt; uint32_t cur_rtt_bytecnt; uint32_t cur_rtt_rsmcnt; uint32_t rc_crtt_set:1, avail_bits:31; uint64_t rs_cDR; }; /* RTT shrink reasons */ #define BBR_RTTS_INIT 0 #define BBR_RTTS_NEWRTT 1 #define BBR_RTTS_RTTPROBE 2 #define BBR_RTTS_WASIDLE 3 #define BBR_RTTS_PERSIST 4 #define BBR_RTTS_REACHTAR 5 #define BBR_RTTS_ENTERPROBE 6 #define BBR_RTTS_SHRINK_PG 7 #define BBR_RTTS_SHRINK_PG_FINAL 8 #define BBR_RTTS_NEW_TARGET 9 #define BBR_RTTS_LEAVE_DRAIN 10 #define BBR_RTTS_RESETS_VALUES 11 #define BBR_NUM_RATES 5 /* Rate flags */ #define BBR_RT_FLAG_FREE 0x00 /* Is on the free list */ #define BBR_RT_FLAG_INUSE 0x01 /* Has been allocated */ #define BBR_RT_FLAG_READY 0x02 /* Ready to initiate a measurement. */ #define BBR_RT_FLAG_CAPPED_PRE 0x04 /* Ready to cap if we send the next segment */ #define BBR_RT_FLAG_CAPPED 0x08 /* Measurement is capped */ #define BBR_RT_FLAG_PASTFA 0x10 /* Past the first ack. */ #define BBR_RT_FLAG_LIMITED 0x20 /* Saw application/cwnd or rwnd limited period */ #define BBR_RT_SEEN_A_ACK 0x40 /* A ack has been saved */ #define BBR_RT_PREV_RTT_SET 0x80 /* There was a RTT set in */ #define BBR_RT_PREV_SEND_TIME 0x100 /* *There was a RTT send time set that can be used * no snd_limits */ #define BBR_RT_SET_GRADIENT 0x200 #define BBR_RT_TS_VALID 0x400 struct bbr_log { union { struct bbr_sendmap *rsm; /* For alloc/free */ uint64_t sb_acc; /* For out/ack or t-o */ }; struct tcpcb *tp; uint32_t t_flags; uint32_t th_seq; uint32_t th_ack; uint32_t snd_una; uint32_t snd_nxt; uint32_t snd_max; uint32_t snd_cwnd; uint32_t snd_wnd; uint32_t rc_lost; uint32_t target_cwnd; /* UU */ uint32_t inflight; /* UU */ uint32_t applimited; /* UU */ /* Things for BBR */ uint32_t delivered; /* UU */ uint64_t cur_del_rate; /* UU */ uint64_t delRate; /* UU */ uint64_t rttProp; /* UU */ uint64_t lt_bw; /* UU */ uint32_t timeStamp; uint32_t time; uint32_t slot; /* UU */ uint32_t delayed_by; uint32_t exp_del; uint32_t pkts_out; uint32_t new_win; uint32_t hptsi_gain; /* UU */ uint32_t cwnd_gain; /* UU */ uint32_t epoch; /* UU */ uint32_t lt_epoch; /* UU */ /* Sack fun */ uint32_t blk_start[4]; /* xx */ uint32_t blk_end[4]; uint32_t len; /* Timeout T3=1, TLP=2, RACK=3 */ uint8_t type; uint8_t n_sackblks; uint8_t applied; /* UU */ uint8_t inhpts; /* UU */ uint8_t ininput; /* UU */ uint8_t use_lt_bw; /* UU */ }; struct bbr_log_sysctl_out { uint32_t bbr_log_at; uint32_t bbr_log_max; struct bbr_log entries[0]; }; /* * Magic numbers for logging timeout events if the * logging is enabled. */ #define BBR_TO_FRM_TMR 1 #define BBR_TO_FRM_TLP 2 #define BBR_TO_FRM_RACK 3 #define BBR_TO_FRM_KEEP 4 #define BBR_TO_FRM_PERSIST 5 #define BBR_TO_FRM_DELACK 6 #define BBR_SEES_STRETCH_ACK 1 #define BBR_SEES_COMPRESSED_ACKS 2 /* * As we get each SACK we wade through the * rc_map and mark off what is acked. * We also increment rc_sacked as well. * * We also pay attention to missing entries * based on the time and possibly mark them * for retransmit. If we do and we are not already * in recovery we enter recovery. In doing * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. * We also setup rc_next/rc_snd_nxt/rc_send_end so * we will know where to send from. When not in * recovery rc_next will be NULL and rc_snd_nxt should * equal snd_max. * * Whenever we retransmit from recovery we increment * rc_holes_rxt as we retran a block and mark it as retransmitted * with the time it was sent. During non-recovery sending we * add to our map and note the time down of any send expanding * the rc_map at the tail and moving rc_snd_nxt up with snd_max. * * In recovery during SACK/ACK processing if a chunk has * been retransmitted and it is now acked, we decrement rc_holes_rxt. * When we retransmit from the scoreboard we use * rc_next and rc_snd_nxt/rc_send_end to help us * find what needs to be retran. * * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt * This gets us the effect of RFC6675 pipe, counting twice for * bytes retransmitted. */ #define TT_BBR_FR_TMR 0x2001 #define BBR_SCALE 8 #define BBR_UNIT (1 << BBR_SCALE) #define BBR_NUM_RTTS_FOR_DEL_LIMIT 8 /* How many pkt-rtts do we keep * Delivery rate for */ #define BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT 10 /* How many pkt-rtts do we keep * Delivery rate for google */ #define BBR_SECONDS_NO_RTT 10 /* 10 seconds with no RTT shrinkage */ #define BBR_PROBERTT_MAX 200 /* 200ms */ #define BBR_PROBERTT_NUM_MSS 4 #define BBR_STARTUP_EPOCHS 3 #define USECS_IN_MSEC 1000 #define BBR_TIME_TO_SECONDS(a) (a / USECS_IN_SECOND) #define BBR_TIME_TO_MILLI(a) (a / MS_IN_USEC) /* BBR keeps time in usec's so we divide by 1000 and round up */ #define BBR_TS_TO_MS(t) ((t+999)/MS_IN_USEC) /* * Locking for the rack control block. * a) Locked by INP_WLOCK * b) Locked by the hpts-mutex * */ #define BBR_STATE_STARTUP 0x01 #define BBR_STATE_DRAIN 0x02 #define BBR_STATE_PROBE_BW 0x03 #define BBR_STATE_PROBE_RTT 0x04 #define BBR_STATE_IDLE_EXIT 0x05 /* Substate defines for STATE == PROBE_BW */ #define BBR_SUB_GAIN 0 /* State 0 where we are 5/4 BBR_UNIT */ #define BBR_SUB_DRAIN 1 /* State 1 where we are at 3/4 BBR_UNIT */ #define BBR_SUB_LEVEL1 2 /* State 1 first BBR_UNIT */ #define BBR_SUB_LEVEL2 3 /* State 2nd BBR_UNIT */ #define BBR_SUB_LEVEL3 4 /* State 3rd BBR_UNIT */ #define BBR_SUB_LEVEL4 5 /* State 4th BBR_UNIT */ #define BBR_SUB_LEVEL5 6 /* State 5th BBR_UNIT */ #define BBR_SUB_LEVEL6 7 /* State last BBR_UNIT */ #define BBR_SUBSTATE_COUNT 8 /* Single remaining reduce log */ #define BBR_REDUCE_AT_FR 5 #define BBR_BIG_LOG_SIZE 300000 struct bbr_stats { uint64_t bbr_badfr; /* 0 */ uint64_t bbr_badfr_bytes; /* 1 */ uint64_t bbr_saw_oerr; /* 2 */ uint64_t bbr_saw_emsgsiz; /* 3 */ uint64_t bbr_reorder_seen; /* 4 */ uint64_t bbr_tlp_tot; /* 5 */ uint64_t bbr_tlp_newdata; /* 6 */ uint64_t bbr_offset_recovery; /* 7 */ uint64_t bbr_tlp_retran_fail; /* 8 */ uint64_t bbr_to_tot; /* 9 */ uint64_t bbr_to_arm_rack; /* 10 */ uint64_t bbr_enter_probertt; /* 11 */ uint64_t bbr_tlp_set; /* 12 */ uint64_t bbr_resends_set; /* 13 */ uint64_t bbr_force_output; /* 14 */ uint64_t bbr_to_arm_tlp; /* 15 */ uint64_t bbr_paced_segments; /* 16 */ uint64_t bbr_saw_enobuf; /* 17 */ uint64_t bbr_to_alloc_failed; /* 18 */ uint64_t bbr_to_alloc_emerg; /* 19 */ uint64_t bbr_sack_proc_all; /* 20 */ uint64_t bbr_sack_proc_short; /* 21 */ uint64_t bbr_sack_proc_restart; /* 22 */ uint64_t bbr_to_alloc; /* 23 */ uint64_t bbr_offset_drop; /* 24 */ uint64_t bbr_runt_sacks; /* 25 */ uint64_t bbr_sack_passed; /* 26 */ uint64_t bbr_rlock_left_ret0; /* 27 */ uint64_t bbr_rlock_left_ret1; /* 28 */ uint64_t bbr_dynamic_rwnd; /* 29 */ uint64_t bbr_static_rwnd; /* 30 */ uint64_t bbr_sack_blocks; /* 31 */ uint64_t bbr_sack_blocks_skip; /* 32 */ uint64_t bbr_sack_search_both; /* 33 */ uint64_t bbr_sack_search_fwd; /* 34 */ uint64_t bbr_sack_search_back; /* 35 */ uint64_t bbr_plain_acks; /* 36 */ uint64_t bbr_acks_with_sacks; /* 37 */ uint64_t bbr_progress_drops; /* 38 */ uint64_t bbr_early; /* 39 */ uint64_t bbr_reneges_seen; /* 40 */ uint64_t bbr_persist_reneg; /* 41 */ uint64_t bbr_dropped_af_data; /* 42 */ uint64_t bbr_failed_mbuf_aloc; /* 43 */ uint64_t bbr_cwnd_limited; /* 44 */ uint64_t bbr_rwnd_limited; /* 45 */ uint64_t bbr_app_limited; /* 46 */ uint64_t bbr_force_timer_start; /* 47 */ uint64_t bbr_hpts_min_time; /* 48 */ uint64_t bbr_meets_tso_thresh; /* 49 */ uint64_t bbr_miss_tso_rwnd; /* 50 */ uint64_t bbr_miss_tso_cwnd; /* 51 */ uint64_t bbr_miss_tso_app; /* 52 */ uint64_t bbr_miss_retran; /* 53 */ uint64_t bbr_miss_tlp; /* 54 */ uint64_t bbr_miss_unknown; /* 55 */ uint64_t bbr_hdwr_rl_add_ok; /* 56 */ uint64_t bbr_hdwr_rl_add_fail; /* 57 */ uint64_t bbr_hdwr_rl_mod_ok; /* 58 */ uint64_t bbr_hdwr_rl_mod_fail; /* 59 */ uint64_t bbr_collapsed_win; /* 60 */ uint64_t bbr_alloc_limited; /* 61 */ uint64_t bbr_alloc_limited_conns; /* 62 */ uint64_t bbr_split_limited; /* 63 */ }; /* * The structure bbr_opt_stats is a simple * way to see how many options are being * changed in the stack. */ struct bbr_opts_stats { uint64_t tcp_bbr_pace_per_sec; uint64_t tcp_bbr_pace_del_tar; uint64_t tcp_bbr_pace_seg_max; uint64_t tcp_bbr_pace_seg_min; uint64_t tcp_bbr_pace_cross; uint64_t tcp_bbr_drain_inc_extra; uint64_t tcp_bbr_unlimited; uint64_t tcp_bbr_iwintso; uint64_t tcp_bbr_rec_over_hpts; uint64_t tcp_bbr_recforce; uint64_t tcp_bbr_startup_pg; uint64_t tcp_bbr_drain_pg; uint64_t tcp_bbr_rwnd_is_app; uint64_t tcp_bbr_probe_rtt_int; uint64_t tcp_bbr_one_retran; uint64_t tcp_bbr_startup_loss_exit; uint64_t tcp_bbr_use_lowgain; uint64_t tcp_bbr_lowgain_thresh; uint64_t tcp_bbr_lowgain_half; uint64_t tcp_bbr_lowgain_fd; uint64_t tcp_bbr_usedel_rate; uint64_t tcp_bbr_min_rto; uint64_t tcp_bbr_max_rto; uint64_t tcp_rack_pace_max_seg; uint64_t tcp_rack_min_to; uint64_t tcp_rack_reord_thresh; uint64_t tcp_rack_reord_fade; uint64_t tcp_rack_tlp_thresh; uint64_t tcp_rack_pkt_delay; uint64_t tcp_bbr_startup_exit_epoch; uint64_t tcp_bbr_ack_comp_alg; uint64_t tcp_rack_cheat; uint64_t tcp_iwnd_tso; uint64_t tcp_utter_max_tso; uint64_t tcp_hdwr_pacing; uint64_t tcp_extra_state; uint64_t tcp_floor_min_tso; /* New */ uint64_t tcp_bbr_algorithm; uint64_t tcp_bbr_tslimits; uint64_t tcp_bbr_probertt_len; uint64_t tcp_bbr_probertt_gain; uint64_t tcp_bbr_topaceout; uint64_t tcp_use_rackcheat; uint64_t tcp_delack; uint64_t tcp_maxpeak; uint64_t tcp_retran_wtso; uint64_t tcp_data_ac; uint64_t tcp_ts_raises; uint64_t tcp_pacing_oh_tmr; uint64_t tcp_pacing_oh; uint64_t tcp_policer_det; }; #ifdef _KERNEL #define BBR_STAT_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) extern counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; #define BBR_STAT_ADD(name, amm) counter_u64_add(bbr_stat_arry[(offsetof(struct bbr_stats, name)/sizeof(uint64_t))], (amm)) #define BBR_STAT_INC(name) BBR_STAT_ADD(name, 1) #define BBR_OPTS_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) extern counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; #define BBR_OPTS_ADD(name, amm) counter_u64_add(bbr_opts_arry[(offsetof(struct bbr_opts_stats, name)/sizeof(uint64_t))], (amm)) #define BBR_OPTS_INC(name) BBR_OPTS_ADD(name, 1) #endif #define BBR_NUM_LOSS_RATES 3 #define BBR_NUM_BW_RATES 3 #define BBR_RECOVERY_LOWRTT 1 #define BBR_RECOVERY_MEDRTT 2 #define BBR_RECOVERY_HIGHRTT 3 #define BBR_RECOVERY_EXTREMERTT 4 struct bbr_control { /*******************************/ /* Cache line 2 from bbr start */ /*******************************/ struct bbr_head rc_map; /* List of all segments Lock(a) */ struct bbr_head rc_tmap; /* List in transmit order Lock(a) */ struct bbr_sendmap *rc_resend; /* something we have been asked to * resend */ uint32_t rc_last_delay_val; /* How much we expect to delay Lock(a) */ uint32_t rc_bbr_hptsi_gain:16, /* Current hptsi gain Lock(a) */ rc_hpts_flags:16; /* flags on whats on the pacer wheel */ uint32_t rc_delivered; /* BRR delivered amount Lock(a) */ uint32_t rc_hptsi_agg_delay; /* How much time are we behind */ uint32_t rc_flight_at_input; uint32_t rc_lost_bytes; /* Total bytes currently marked lost */ /*******************************/ /* Cache line 3 from bbr start */ /*******************************/ struct time_filter rc_delrate; /*******************************/ /* Cache line 4 from bbr start */ /*******************************/ struct bbr_head rc_free; /* List of Free map entries Lock(a) */ struct bbr_sendmap *rc_tlp_send; /* something we have been * asked to resend */ uint32_t rc_del_time; uint32_t rc_target_at_state; /* Target for a state */ uint16_t rc_free_cnt; /* Number of free entries on the rc_free list * Lock(a) */ uint16_t rc_startup_pg; uint32_t cur_rtt; /* Last RTT from ack */ uint32_t rc_went_idle_time; /* Used for persits to see if its * probe-rtt qualified */ uint32_t rc_pace_max_segs:17, /* How much in any single TSO we send Lock(a) */ rc_pace_min_segs:15; /* The minimum single segment size before we enter persists */ uint32_t rc_rtt_shrinks; /* Time of last rtt shrinkage Lock(a) */ uint32_t r_app_limited_until; uint32_t rc_timer_exp; /* If a timer ticks of expiry */ uint32_t rc_rcv_epoch_start; /* Start time of the Epoch Lock(a) */ /*******************************/ /* Cache line 5 from bbr start */ /*******************************/ uint32_t rc_lost_at_pktepoch; /* what the lost value was at the last * pkt-epoch */ uint32_t r_measurement_count; /* count of measurement applied lock(a) */ uint32_t rc_last_tlp_seq; /* Last tlp sequence Lock(a) */ uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ uint16_t rc_pkt_delay; /* Socket option value Lock(a) */ struct bbr_sendmap *rc_sacklast; /* sack remembered place * Lock(a) */ struct bbr_sendmap *rc_next; /* remembered place where we next * retransmit at Lock(a) */ uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ uint32_t rc_init_rwnd; /* Initial rwnd when we transitioned */ /*- --- * used only initial and close */ uint32_t rc_high_rwnd; /* Highest rwnd seen */ uint32_t rc_lowest_rtt; /* Smallest RTT we have seen */ uint32_t rc_last_rtt; /* Last valid measured RTT that ack'd data */ uint32_t bbr_cross_over; /*******************************/ /* Cache line 6 from bbr start */ /*******************************/ struct sack_filter bbr_sf; /*******************************/ /* Cache line 7 from bbr start */ /*******************************/ struct time_filter_small rc_rttprop; uint32_t last_inbound_ts; /* Peers last timestamp */ uint32_t rc_inc_tcp_oh: 1, rc_inc_ip_oh: 1, rc_inc_enet_oh:1, rc_incr_tmrs:1, restrict_growth:28; uint32_t rc_lt_epoch_use; /* When we started lt-bw use Lock(a) */ uint32_t rc_recovery_start; /* Time we start recovery Lock(a) */ uint32_t rc_lt_del; /* Delivered at lt bw sampling start Lock(a) */ uint64_t rc_bbr_cur_del_rate; /* Current measured delivery rate * Lock(a) */ /*******************************/ /* Cache line 8 from bbr start */ /*******************************/ uint32_t rc_cwnd_on_ent; /* On entry to recovery the cwnd * Lock(a) */ uint32_t rc_agg_early; /* aggregate amount early */ uint32_t rc_rcvtime; /* When we last received data Lock(a) */ uint32_t rc_pkt_epoch_del; /* seq num that we need for RTT epoch */ uint32_t rc_pkt_epoch; /* Epoch based on packet RTTs */ uint32_t rc_pkt_epoch_time; /* Time we started the pkt epoch */ uint32_t rc_pkt_epoch_rtt; /* RTT using the packet epoch */ uint32_t rc_rtt_epoch; /* Current RTT epoch, it ticks every rttProp * Lock(a) */ uint32_t lowest_rtt; uint32_t bbr_smallest_srtt_this_state; uint32_t rc_lt_epoch; /* LT epoch start of bw_sampling */ uint32_t rc_lost_at_startup; uint32_t rc_bbr_state_atflight; uint32_t rc_bbr_last_startup_epoch; /* Last startup epoch where we * increased 20% */ uint32_t rc_bbr_enters_probertt; /* Timestamp we entered * probertt Lock(a) */ uint32_t rc_lt_time; /* Time of lt sampling start Lock(a) */ /*******************************/ /* Cache line 9 from bbr start */ /*******************************/ uint64_t rc_lt_bw; /* LT bw calculated Lock(a) */ uint64_t rc_bbr_lastbtlbw; /* For startup, what was last btlbw I * saw to check the 20% gain Lock(a) */ uint32_t rc_bbr_cwnd_gain; /* Current cwnd gain Lock(a) */ uint32_t rc_pkt_epoch_loss_rate; /* pkt-epoch loss rate */ uint32_t rc_saved_cwnd; /* Saved cwnd during Probe-rtt drain Lock(a) */ uint32_t substate_pe; uint32_t rc_lost; /* Number of bytes lost Lock(a) */ uint32_t rc_exta_time_gd; /* How much extra time we got in d/g */ uint32_t rc_lt_lost; /* Number of lt bytes lost at sampling start * Lock(a) */ uint32_t rc_bbr_state_time; uint32_t rc_min_to; /* Socket option value Lock(a) */ uint32_t rc_initial_hptsi_bw; /* Our initial startup bw Lock(a) */ uint32_t bbr_lost_at_state; /* Temp counter debug lost value as we * enter a state */ /*******************************/ /* Cache line 10 from bbr start */ /*******************************/ uint32_t rc_level_state_extra; uint32_t rc_red_cwnd_pe; const struct tcp_hwrate_limit_table *crte; uint64_t red_bw; uint32_t rc_probertt_int; uint32_t rc_probertt_srttchktim; /* Time we last did a srtt * check */ uint32_t gain_epoch; /* Epoch we should be out of gain */ uint32_t rc_min_rto_ms; uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ uint32_t last_startup_measure; int32_t bbr_hptsi_per_second; int32_t bbr_hptsi_segments_delay_tar; int32_t bbr_hptsi_segments_max; uint32_t bbr_rttprobe_gain_val; /*******************************/ /* Cache line 11 from bbr start */ /*******************************/ uint32_t cur_rtt_send_time; /* Time we sent our rtt measured packet */ uint32_t bbr_peer_tsratio; /* Our calculated ts ratio to multply */ uint32_t bbr_ts_check_tstmp; /* When we filled it the TS that came on the ack */ uint32_t bbr_ts_check_our_cts; /* When we filled it the cts of the send */ uint32_t rc_tlp_rxt_last_time; uint32_t bbr_smallest_srtt_state2; uint32_t bbr_hdwr_cnt_noset_snt; /* count of hw pacing sends during delay */ uint32_t startup_last_srtt; uint32_t rc_ack_hdwr_delay; uint32_t highest_hdwr_delay; /* Largest delay we have seen from hardware */ uint32_t non_gain_extra; uint32_t recovery_lr; /* The sum of the loss rate from the pe's during recovery */ uint32_t last_in_probertt; uint32_t flightsize_at_drain; /* In draining what was the last marked flight size */ uint32_t rc_pe_of_prtt; /* PE we went into probe-rtt */ uint32_t ts_in; /* ts that went with the last rtt */ uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent * rc_last_tlp_seq Lock(a) */ uint16_t rc_drain_pg; uint32_t rc_num_maps_alloced; /* num send map entries allocated */ uint32_t rc_num_split_allocs; /* num split map entries allocated */ uint16_t rc_num_small_maps_alloced; /* Number of sack blocks * allocated */ uint16_t bbr_hptsi_bytes_min; uint16_t bbr_hptsi_segments_floor; uint16_t bbr_utter_max; uint16_t bbr_google_discount; }; struct socket; struct tcp_bbr { /* First cache line 0x00 */ int32_t(*r_substate) (struct mbuf *, struct tcphdr *, struct socket *, struct tcpcb *, struct tcpopt *, int32_t, int32_t, uint32_t, int32_t, int32_t, uint8_t); /* Lock(a) */ struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ struct inpcb *rc_inp; /* The inpcb Lock(a) */ struct timeval rc_tv; uint32_t rc_pacer_started; /* Time we started the pacer */ uint16_t no_pacing_until:8, /* No pacing until N packet epochs */ ts_can_raise:1,/* TS b/w calculations can raise the bw higher */ skip_gain:1, /* Skip the gain cycle (hardware pacing) */ gain_is_limited:1, /* With hardware pacing we are limiting gain */ output_error_seen:1, oerror_cnt:4, hw_pacing_set:1; /* long enough has passed for us to start pacing */ uint16_t xxx_r_ack_count; /* During recovery count of ack's received * that added data since output */ uint16_t bbr_segs_rcvd; /* In Segment count since we sent a ack */ uint8_t bbr_timer_src:4, /* Used for debugging Lock(a) */ bbr_use_rack_cheat:1, /* Use the rack cheat */ bbr_init_win_cheat:1, /* Send full IW for TSO */ bbr_attempt_hdwr_pace:1,/* Try to do hardware pacing */ bbr_hdrw_pacing:1; /* Hardware pacing is available */ uint8_t bbr_hdw_pace_ena:1, /* Does the connection allow hardware pacing to be attempted */ bbr_prev_in_rec:1, /* We were previously in recovery */ pkt_conservation:1, use_policer_detection:1, xxx_bbr_hdw_pace_idx:4; /* If hardware pacing is on, index to slot in pace tbl */ uint16_t r_wanted_output:1, rtt_valid:1, rc_timer_first:1, rc_output_starts_timer:1, rc_resends_use_tso:1, rc_all_timers_stopped:1, rc_loss_exit:1, rc_ack_was_delayed:1, rc_lt_is_sampling:1, rc_filled_pipe:1, rc_tlp_new_data:1, rc_hit_state_1:1, rc_ts_valid:1, rc_prtt_set_ts:1, rc_is_pkt_epoch_now:1, rc_has_collapsed:1; uint8_t r_state:4, /* Current bbr state Lock(a) */ r_agg_early_set:1, /* Did we get called early */ r_init_rtt:1, r_use_policer:1, /* For google mode only */ r_recovery_bw:1; uint8_t r_timer_override:1, /* pacer override Lock(a) 0/1 */ rc_in_persist:1, rc_lt_use_bw:1, rc_allow_data_af_clo:1, rc_tlp_rtx_out:1, /* A TLP is in flight */ rc_tlp_in_progress:1, /* a TLP timer is running needed? */ rc_use_idle_restart:1; /* Do we restart fast after idle (persist or applim) */ uint8_t rc_bbr_state:3, /* What is the major BBR state */ rc_bbr_substate:3, /* For probeBW state */ r_is_v6:1, rc_past_init_win:1; uint8_t rc_last_options; uint8_t rc_tlp_threshold; /* Socket option value Lock(a) */ uint8_t rc_max_rto_sec; uint8_t rc_cwnd_limited:1, /* We are cwnd limited */ rc_tmr_stopped:7; /* What timers have been stopped */ uint8_t rc_use_google:1, rc_use_ts_limit:1, rc_ts_data_set:1, /* We have filled a set point to determine */ rc_ts_clock_set:1, /* We have determined the ts type */ rc_ts_cant_be_used:1, /* We determined we can't use ts values */ rc_ack_is_cumack:1, rc_no_pacing:1, alloc_limit_reported:1; uint8_t rc_init_win; /* Cache line 2 0x40 */ struct bbr_control r_ctl; #ifdef _KERNEL } __aligned(CACHE_LINE_SIZE); #else }; #endif #endif
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