Current File : //backups/router/usr/include/netinet/tcp_stacks/tcp_rack.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.
*/
#ifndef _NETINET_TCP_RACK_H_
#define _NETINET_TCP_RACK_H_
#define RACK_ACKED 0x000001/* The remote endpoint acked this */
#define RACK_TO_REXT 0x000002/* A timeout occurred on this sendmap entry */
#define RACK_DEFERRED 0x000004/* We can't use this for RTT calc - not used */
#define RACK_OVERMAX 0x000008/* We have more retran's then we can fit */
#define RACK_SACK_PASSED 0x000010/* A sack was done above this block */
#define RACK_WAS_SACKPASS 0x000020/* We retransmitted due to SACK pass */
#define RACK_HAS_FIN 0x000040/* segment is sent with fin */
#define RACK_TLP 0x000080/* segment sent as tail-loss-probe */
#define RACK_RWND_COLLAPSED 0x000100/* The peer collapsed the rwnd on the segment */
#define RACK_APP_LIMITED 0x000200/* We went app limited after this send */
#define RACK_WAS_ACKED 0x000400/* a RTO undid the ack, but it already had a rtt calc done */
#define RACK_HAS_SYN 0x000800/* SYN is on this guy */
#define RACK_SENT_W_DSACK 0x001000/* Sent with a dsack */
#define RACK_SENT_SP 0x002000/* sent in slow path */
#define RACK_SENT_FP 0x004000/* sent in fast path */
#define RACK_HAD_PUSH 0x008000/* Push was sent on original send */
#define RACK_MUST_RXT 0x010000/* We must retransmit this rsm (non-sack/mtu chg)*/
#define RACK_IN_GP_WIN 0x020000/* Send was in GP window when sent */
#define RACK_SHUFFLED 0x040000/* The RSM was shuffled some data from one to another */
#define RACK_MERGED 0x080000/* The RSM was merged */
#define RACK_PMTU_CHG 0x100000/* The path mtu changed on this guy */
#define RACK_STRADDLE 0x200000/* The seq straddles the bucket line */
#define RACK_NUM_OF_RETRANS 3
#define RACK_INITIAL_RTO 1000000 /* 1 second in microseconds */
#define RACK_REQ_AVG 3 /* Must be less than 256 */
struct rack_sendmap {
TAILQ_ENTRY(rack_sendmap) next;
TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */
uint32_t bindex;
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_flags : 24, /* Flags as defined above */
r_rtr_cnt : 8; /* Retran count, index this -1 to get time */
struct mbuf *m;
uint32_t soff;
uint32_t orig_m_len; /* The original mbuf len when we sent (can update) */
uint32_t orig_t_space; /* The original trailing space when we sent (can update) */
uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */
uint8_t r_dupack; /* Dup ack count */
uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */
uint8_t r_limit_type; /* is this entry counted against a limit? */
uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */
r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */
r_no_rtt_allowed : 1, /* No rtt measurement allowed */
r_hw_tls : 1,
r_avail : 4;
uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */
uint32_t r_fas; /* Flight at send */
uint8_t r_bas; /* The burst size (burst at send = bas) */
};
struct deferred_opt_list {
TAILQ_ENTRY(deferred_opt_list) next;
int optname;
uint64_t optval;
};
/*
* Timestamps in the rack sendmap are now moving to be
* uint64_t's. This means that if you want a uint32_t
* usec timestamp (the old usecond timestamp) you simply have
* to cast it to uint32_t. The reason we do this is not for
* wrap, but we need to get back, at times, to the millisecond
* timestamp that is used in the TSTMP option. To do this we
* can use the rack_ts_to_msec() inline below which can take
* the 64bit ts and make into the correct timestamp millisecond
* wise. Thats not possible with the 32bit usecond timestamp since
* the seconds wrap too quickly to cover all bases.
*
* There are quite a few places in rack where I simply cast
* back to uint32_t and then end up using the TSTMP_XX()
* macros. This is ok, but we could do simple compares if
* we ever decided to move all of those variables to 64 bits
* as well.
*/
static inline uint64_t
rack_to_usec_ts(struct timeval *tv)
{
return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec);
}
static inline uint32_t
rack_ts_to_msec(uint64_t ts)
{
return((uint32_t)(ts / HPTS_MSEC_IN_SEC));
}
TAILQ_HEAD(rack_head, rack_sendmap);
TAILQ_HEAD(def_opt_head, deferred_opt_list);
/* Map change logging */
#define MAP_MERGE 0x01
#define MAP_SPLIT 0x02
#define MAP_NEW 0x03
#define MAP_SACK_M1 0x04
#define MAP_SACK_M2 0x05
#define MAP_SACK_M3 0x06
#define MAP_SACK_M4 0x07
#define MAP_SACK_M5 0x08
#define MAP_FREE 0x09
#define MAP_TRIM_HEAD 0x0a
#define RACK_LIMIT_TYPE_SPLIT 1
/*
* 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 RACK_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */
#define RACK_RTT_VALID 0x00000002 /* We have at least one valid RTT */
struct rack_rtt_sample {
uint32_t rs_flags;
uint32_t rs_rtt_lowest;
uint32_t rs_rtt_highest;
uint32_t rs_rtt_cnt;
uint32_t rs_us_rtt;
int32_t confidence;
uint64_t rs_rtt_tot;
uint16_t rs_us_rtrcnt;
};
#define RACK_LOG_TYPE_ACK 0x01
#define RACK_LOG_TYPE_OUT 0x02
#define RACK_LOG_TYPE_TO 0x03
#define RACK_LOG_TYPE_ALLOC 0x04
#define RACK_LOG_TYPE_FREE 0x05
/*
* Magic numbers for logging timeout events if the
* logging is enabled.
*/
#define RACK_TO_FRM_TMR 1
#define RACK_TO_FRM_TLP 2
#define RACK_TO_FRM_RACK 3
#define RACK_TO_FRM_KEEP 4
#define RACK_TO_FRM_PERSIST 5
#define RACK_TO_FRM_DELACK 6
struct rack_opts_stats {
uint64_t tcp_rack_tlp_reduce;
uint64_t tcp_rack_pace_always;
uint64_t tcp_rack_pace_reduce;
uint64_t tcp_rack_max_seg;
uint64_t tcp_rack_prr_sendalot;
uint64_t tcp_rack_min_to;
uint64_t tcp_rack_early_seg;
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_rack_tlp_inc_var;
uint64_t tcp_tlp_use;
uint64_t tcp_rack_idle_reduce;
uint64_t tcp_rack_idle_reduce_high;
uint64_t rack_no_timer_in_hpts;
uint64_t tcp_rack_min_pace_seg;
uint64_t tcp_rack_pace_rate_ca;
uint64_t tcp_rack_rr;
uint64_t tcp_rack_do_detection;
uint64_t tcp_rack_rrr_no_conf_rate;
uint64_t tcp_initial_rate;
uint64_t tcp_initial_win;
uint64_t tcp_hdwr_pacing;
uint64_t tcp_gp_inc_ss;
uint64_t tcp_gp_inc_ca;
uint64_t tcp_gp_inc_rec;
uint64_t tcp_rack_force_max_seg;
uint64_t tcp_rack_pace_rate_ss;
uint64_t tcp_rack_pace_rate_rec;
/* Temp counters for dsack */
uint64_t tcp_sack_path_1; /* not used */
uint64_t tcp_sack_path_2a; /* not used */
uint64_t tcp_sack_path_2b; /* not used */
uint64_t tcp_sack_path_3; /* not used */
uint64_t tcp_sack_path_4; /* not used */
/* non temp counters */
uint64_t tcp_rack_scwnd;
uint64_t tcp_rack_noprr;
uint64_t tcp_rack_cfg_rate;
uint64_t tcp_timely_dyn;
uint64_t tcp_rack_mbufq;
uint64_t tcp_fillcw;
uint64_t tcp_npush;
uint64_t tcp_lscwnd;
uint64_t tcp_profile;
uint64_t tcp_hdwr_rate_cap;
uint64_t tcp_pacing_rate_cap;
uint64_t tcp_pacing_up_only;
uint64_t tcp_use_cmp_acks;
uint64_t tcp_rack_abc_val;
uint64_t tcp_rec_abc_val;
uint64_t tcp_rack_measure_cnt;
uint64_t tcp_rack_delayed_ack;
uint64_t tcp_rack_rtt_use;
uint64_t tcp_data_after_close;
uint64_t tcp_defer_opt;
uint64_t tcp_rxt_clamp;
uint64_t tcp_rack_beta;
uint64_t tcp_rack_beta_ecn;
uint64_t tcp_rack_timer_slop;
uint64_t tcp_rack_dsack_opt;
uint64_t tcp_rack_hi_beta;
uint64_t tcp_split_limit;
uint64_t tcp_rack_pacing_divisor;
uint64_t tcp_rack_min_seg;
uint64_t tcp_dgp_in_rec;
};
/* RTT shrink reasons */
#define RACK_RTTS_INIT 0
#define RACK_RTTS_NEWRTT 1
#define RACK_RTTS_EXITPROBE 2
#define RACK_RTTS_ENTERPROBE 3
#define RACK_RTTS_REACHTARGET 4
#define RACK_RTTS_SEEHBP 5
#define RACK_RTTS_NOBACKOFF 6
#define RACK_RTTS_SAFETY 7
#define RACK_USE_BEG 1
#define RACK_USE_END 2
#define RACK_USE_END_OR_THACK 3
#define TLP_USE_ID 1 /* Internet draft behavior */
#define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */
#define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */
#define RACK_MIN_BW 8000 /* 64kbps in Bps */
/* Rack quality indicators for GPUT measurements */
#define RACK_QUALITY_NONE 0 /* No quality stated */
#define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */
#define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */
#define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */
#define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */
#define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */
#define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */
#ifdef _KERNEL
#define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t))
extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
#define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm))
#define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1)
#endif
/*
* 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_RACK_FR_TMR 0x2000
/*
* Locking for the rack control block.
* a) Locked by INP_WLOCK
* b) Locked by the hpts-mutex
*
*/
#define RACK_GP_HIST 4 /* How much goodput history do we maintain? */
#define RACK_NUM_FSB_DEBUG 16
#ifdef _KERNEL
struct rack_fast_send_blk {
uint32_t left_to_send;
uint16_t tcp_ip_hdr_len;
uint8_t tcp_flags;
uint8_t hoplimit;
uint8_t *tcp_ip_hdr;
uint32_t recwin;
uint32_t off;
struct tcphdr *th;
struct udphdr *udp;
struct mbuf *m;
uint32_t o_m_len;
uint32_t o_t_len;
uint32_t rfo_apply_push : 1,
hw_tls : 1,
unused : 30;
};
struct tailq_hash;
struct rack_control {
/* Second cache line 0x40 from tcp_rack */
struct tailq_hash *tqh; /* Tree of all segments Lock(a) */
struct rack_head rc_tmap; /* List in transmit order Lock(a) */
struct rack_sendmap *rc_tlpsend; /* Remembered place for
* tlp_sending Lock(a) */
struct rack_sendmap *rc_resend; /* something we have been asked to
* resend */
struct rack_fast_send_blk fsb; /* The fast-send block */
uint32_t timer_slop;
uint16_t pace_len_divisor;
uint16_t rc_user_set_min_segs;
uint32_t rc_hpts_flags;
uint32_t rc_fixed_pacing_rate_ca;
uint32_t rc_fixed_pacing_rate_rec;
uint32_t rc_fixed_pacing_rate_ss;
uint32_t cwnd_to_use; /* The cwnd in use */
uint32_t rc_timer_exp; /* If a timer ticks of expiry */
uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */
uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */
/* Third Cache line 0x80 */
struct rack_head rc_free; /* Allocation array */
uint64_t last_hw_bw_req;
uint64_t crte_prev_rate;
uint64_t bw_rate_cap;
uint64_t last_cumack_advance; /* Last time cumack moved forward */
uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */
uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP
* Lock(a) */
uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */
uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */
uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */
uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */
uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */
uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */
uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */
uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */
uint32_t rc_loss_count; /* How many bytes have been retransmitted
* Lock(a) */
uint32_t rc_reorder_fade; /* Socket option value Lock(a) */
/* Forth cache line 0xc0 */
/* Times */
uint32_t rc_rack_tmit_time; /* Rack transmit time Lock(a) */
uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */
uint32_t rc_num_maps_alloced; /* Number of map blocks (sacks) we
* have allocated */
uint32_t rc_rcvtime; /* When we last received data */
uint32_t rc_num_split_allocs; /* num split map entries allocated */
uint32_t rc_split_limit; /* Limit from control var can be set by socket opt */
uint32_t rc_last_output_to;
uint32_t rc_went_idle_time;
struct rack_sendmap *rc_sacklast; /* sack remembered place
* Lock(a) */
struct rack_sendmap *rc_first_appl; /* Pointer to first app limited */
struct rack_sendmap *rc_end_appl; /* Pointer to last app limited */
/* Cache line split 0x100 */
struct sack_filter rack_sf;
/* Cache line split 0x140 */
/* Flags for various things */
uint32_t rc_pace_max_segs;
uint32_t rc_pace_min_segs;
uint32_t rc_app_limited_cnt;
uint16_t rack_per_of_gp_ss; /* 100 = 100%, so from 65536 = 655 x bw */
uint16_t rack_per_of_gp_ca; /* 100 = 100%, so from 65536 = 655 x bw */
uint16_t rack_per_of_gp_rec; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */
uint16_t rack_per_of_gp_probertt; /* 100 = 100%, so from 65536 = 655 x bw, 0=off */
uint32_t rc_high_rwnd;
uint32_t ack_count;
uint32_t sack_count;
uint32_t sack_noextra_move;
uint32_t sack_moved_extra;
struct rack_rtt_sample rack_rs;
const struct tcp_hwrate_limit_table *crte;
uint32_t rc_agg_early;
uint32_t rc_agg_delayed;
uint32_t rc_tlp_rxt_last_time;
uint32_t rc_saved_cwnd;
uint64_t rc_gp_output_ts; /* chg*/
uint64_t rc_gp_cumack_ts; /* chg*/
struct timeval act_rcv_time;
struct timeval rc_last_time_decay; /* SAD time decay happened here */
uint64_t gp_bw;
uint64_t init_rate;
#ifdef NETFLIX_SHARED_CWND
struct shared_cwnd *rc_scw;
#endif
uint64_t last_gp_comp_bw;
uint64_t last_max_bw; /* Our calculated max b/w last */
struct time_filter_small rc_gp_min_rtt;
struct def_opt_head opt_list;
uint64_t lt_bw_time; /* Total time with data outstanding (lt_bw = long term bandwidth) */
uint64_t lt_bw_bytes; /* Total bytes acked */
uint64_t lt_timemark; /* 64 bit timestamp when we started sending */
struct tcp_sendfile_track *rc_last_sft;
uint32_t lt_seq; /* Seq at start of lt_bw gauge */
int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */
uint64_t last_sndbytes;
uint64_t last_snd_rxt_bytes;
uint64_t rxt_threshold;
uint64_t last_tmit_time_acked; /* Holds the last cumack point's last send time */
uint32_t last_rnd_rxt_clamped;
uint32_t num_of_clamps_applied;
uint32_t clamp_options;
uint32_t max_clamps;
uint32_t rc_gp_srtt; /* Current GP srtt */
uint32_t rc_prev_gp_srtt; /* Previous RTT */
uint32_t rc_entry_gp_rtt; /* Entry to PRTT gp-rtt */
uint32_t rc_loss_at_start; /* At measurement window where was our lost value */
uint32_t dsack_round_end; /* In a round of seeing a DSACK */
uint32_t current_round; /* Starting at zero */
uint32_t roundends; /* acked value above which round ends */
uint32_t num_dsack; /* Count of dsack's seen (1 per window)*/
uint32_t forced_ack_ts;
uint32_t last_collapse_point; /* Last point peer collapsed too */
uint32_t high_collapse_point;
uint32_t rc_lower_rtt_us_cts; /* Time our GP rtt was last lowered */
uint32_t rc_time_probertt_entered;
uint32_t rc_time_probertt_starts;
uint32_t rc_lowest_us_rtt;
uint32_t rc_highest_us_rtt;
uint32_t rc_last_us_rtt;
uint32_t rc_time_of_last_probertt;
uint32_t rc_target_probertt_flight;
uint32_t rc_probertt_sndmax_atexit; /* Highest sent to in probe-rtt */
uint32_t rc_cwnd_at_erec;
uint32_t rc_ssthresh_at_erec;
uint32_t dsack_byte_cnt;
uint32_t retran_during_recovery;
uint32_t rc_gp_lowrtt; /* Lowest rtt seen during GPUT measurement */
uint32_t rc_gp_high_rwnd; /* Highest rwnd seen during GPUT measurement */
uint32_t rc_snd_max_at_rto; /* For non-sack when the RTO occurred what was snd-max */
uint32_t rc_out_at_rto;
int32_t rc_scw_index;
uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */
uint32_t rc_last_timeout_snduna;
uint32_t last_tlp_acked_start;
uint32_t last_tlp_acked_end;
uint32_t challenge_ack_ts;
uint32_t challenge_ack_cnt;
uint32_t rc_min_to; /* Socket option value Lock(a) */
uint32_t rc_pkt_delay; /* Socket option value Lock(a) */
uint32_t persist_lost_ends;
uint32_t ack_during_sd;
uint32_t input_pkt;
uint32_t saved_input_pkt;
uint32_t saved_rxt_clamp_val; /* The encoded value we used to setup clamping */
struct newreno rc_saved_beta; /*
* For newreno cc:
* rc_saved_cc are the values we have had
* set by the user, if pacing is not happening
* (i.e. its early and we have not turned on yet
* or it was turned off). The minute pacing
* is turned on we pull out the values currently
* being used by newreno and replace them with
* these values, then save off the old values here,
* we also set the flag (if ecn_beta is set) to make
* new_reno do less of a backoff for ecn (think abe).
*/
uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */
uint16_t rc_reorder_shift; /* Socket option value Lock(a) */
uint8_t rack_per_upper_bound_ss;
uint8_t rack_per_upper_bound_ca;
uint8_t dsack_persist;
uint8_t rc_no_push_at_mrtt; /* No push when we exceed max rtt */
uint8_t num_measurements; /* Number of measurements (up to 0xff, we freeze at 0xff) */
uint8_t req_measurements; /* How many measurements are required? */
uint8_t saved_hibeta;
uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */
uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */
uint8_t rc_rate_sample_method;
uint8_t rc_dgp_bl_agg; /* Buffer Level aggression during DGP */
uint8_t full_dgp_in_rec; /* Flag to say if we do full DGP in recovery */
uint8_t client_suggested_maxseg; /* Not sure what to do with this yet */
uint8_t pacing_discount_amm; /*
* This is a multipler to the base discount that
* can be used to increase the discount.
*/
uint8_t already_had_a_excess;
};
#endif
/* DGP with no buffer level mitigations */
#define DGP_LEVEL0 0
/*
* DGP with buffer level mitigation where BL:4 caps fillcw and BL:5
* turns off fillcw.
*/
#define DGP_LEVEL1 1
/*
* DGP with buffer level mitigation where BL:3 caps fillcw and BL:4 turns off fillcw
* and BL:5 reduces by 10%
*/
#define DGP_LEVEL2 2
/*
* DGP with buffer level mitigation where BL:2 caps fillcw and BL:3 turns off
* fillcw BL:4 reduces by 10% and BL:5 reduces by 20%
*/
#define DGP_LEVEL3 3
/* Hybrid pacing log defines */
#define HYBRID_LOG_NO_ROOM 0 /* No room for the clients request */
#define HYBRID_LOG_TURNED_OFF 1 /* Turned off hybrid pacing */
#define HYBRID_LOG_NO_PACING 2 /* Failed to set pacing on */
#define HYBRID_LOG_RULES_SET 3 /* Hybrid pacing for this chunk is set */
#define HYBRID_LOG_NO_RANGE 4 /* In DGP mode, no range found */
#define HYBRID_LOG_RULES_APP 5 /* The specified rules were applied */
#define HYBRID_LOG_REQ_COMP 6 /* The request completed */
#define HYBRID_LOG_BW_MEASURE 7 /* Follow up b/w measurements to the previous completed log */
#define HYBRID_LOG_RATE_CAP 8 /* We had a rate cap apply */
#define HYBRID_LOG_CAP_CALC 9 /* How we calculate the cap */
#define HYBRID_LOG_ISSAME 10 /* Same as before -- temp */
#define HYBRID_LOG_ALLSENT 11 /* We sent it all no more rate-cap */
#define HYBRID_LOG_OUTOFTIME 12 /* We are past the deadline DGP */
#define HYBRID_LOG_CAPERROR 13 /* Hit one of the TSNH cases */
#define HYBRID_LOG_EXTEND 14 /* We extended the end */
#define HYBRID_LOG_SENT_LOST 15 /* A closing sent/lost report */
#define RACK_TIMELY_CNT_BOOST 5 /* At 5th increase boost */
#define RACK_MINRTT_FILTER_TIM 10 /* Seconds */
#define RACK_HYSTART_OFF 0
#define RACK_HYSTART_ON 1 /* hystart++ on */
#define RACK_HYSTART_ON_W_SC 2 /* hystart++ on +Slam Cwnd */
#define RACK_HYSTART_ON_W_SC_C 3 /* hystart++ on,
* Conservative ssthresh and
* +Slam cwnd
*/
#define MAX_USER_SET_SEG 0x3f /* The max we can set is 63 which is probably too many */
#ifdef _KERNEL
struct tcp_rack {
/* First cache line 0x00 */
TAILQ_ENTRY(tcp_rack) r_hpts; /* hptsi queue next Lock(b) */
int32_t(*r_substate) (struct mbuf *, struct tcphdr *,
struct socket *, struct tcpcb *, struct tcpopt *,
int32_t, int32_t, uint32_t, int, int, uint8_t); /* Lock(a) */
struct tcpcb *rc_tp; /* The tcpcb Lock(a) */
struct inpcb *rc_inp; /* The inpcb Lock(a) */
uint8_t rc_free_cnt; /* Number of free entries on the rc_free list
* Lock(a) */
uint8_t client_bufferlvl : 3, /* Expected range [0,5]: 0=unset, 1=low/empty */
rack_deferred_inited : 1,
/* ******************************************************************** */
/* Note for details of next two fields see rack_init_retransmit_rate() */
/* ******************************************************************** */
full_size_rxt: 1,
shape_rxt_to_pacing_min : 1,
/* ******************************************************************** */
rc_ack_required: 1,
r_pacing_discount : 1;
uint8_t no_prr_addback : 1,
gp_ready : 1,
defer_options: 1,
excess_rxt_on: 1, /* Are actions on for excess retransmissions? */
rc_ack_can_sendout_data: 1, /*
* If set it will override pacing restrictions on not sending
* data when the pacing timer is running. I.e. you set this
* and an ACK will send data. Default is off and its only used
* without pacing when we are doing 5G speed up for there
* ack filtering.
*/
rc_pacing_cc_set: 1, /*
* If we are pacing (pace_always=1) and we have reached the
* point where we start pacing (fixed or gp has reached its
* magic gp_ready state) this flag indicates we have set in
* values to effect CC's backoff's. If pacing is turned off
* then we must restore the values saved in rc_saved_beta,
* if its going to gp_ready we need to copy the values into
* the CC module and set our flags.
*
* Note this only happens if the cc name is newreno (CCALGONAME_NEWRENO).
*/
rc_rack_tmr_std_based :1,
rc_rack_use_dsack: 1;
uint8_t rc_dsack_round_seen: 1,
rc_last_tlp_acked_set: 1,
rc_last_tlp_past_cumack: 1,
rc_last_sent_tlp_seq_valid: 1,
rc_last_sent_tlp_past_cumack: 1,
probe_not_answered: 1,
rack_hibeta : 1,
lt_bw_up : 1;
uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */
uint16_t r_mbuf_queue : 1, /* Do we do mbuf queue for non-paced */
rtt_limit_mul : 4, /* muliply this by low rtt */
r_limit_scw : 1,
r_must_retran : 1, /* For non-sack customers we hit an RTO and new data should be resends */
r_use_cmp_ack: 1, /* Do we use compressed acks */
r_ent_rec_ns: 1, /* We entered recovery and have not sent */
r_might_revert: 1, /* Flag to find out if we might need to revert */
r_fast_output: 1, /* Fast output is in progress we can skip the bulk of rack_output */
r_fsb_inited: 1,
r_rack_hw_rate_caps: 1,
r_up_only: 1,
r_via_fill_cw : 1,
r_fill_less_agg : 1;
uint8_t rc_user_set_max_segs : 7, /* Socket option value Lock(a) */
rc_fillcw_apply_discount;
uint8_t rc_labc; /* Appropriate Byte Counting Value */
uint16_t forced_ack : 1,
rc_gp_incr : 1,
rc_gp_bwred : 1,
rc_gp_timely_inc_cnt : 3,
rc_gp_timely_dec_cnt : 3,
r_use_labc_for_rec: 1,
rc_highly_buffered: 1, /* The path is highly buffered */
rc_dragged_bottom: 1,
rc_pace_dnd : 1, /* The pace do not disturb bit */
rc_avali2 : 1,
rc_gp_filled : 1,
rc_hw_nobuf : 1;
uint8_t r_state : 4, /* Current rack state Lock(a) */
rc_catch_up : 1, /* catch up mode in dgp */
rc_hybrid_mode : 1, /* We are in hybrid mode */
rc_suspicious : 1, /* Suspect sacks have been given */
rc_new_rnd_needed: 1;
uint8_t rc_tmr_stopped : 7,
t_timers_stopped : 1;
uint8_t rc_enobuf : 7, /* count of enobufs on connection provides */
rc_on_min_to : 1;
uint8_t r_timer_override : 1, /* hpts override Lock(a) */
r_is_v6 : 1, /* V6 pcb Lock(a) */
rc_in_persist : 1,
rc_tlp_in_progress : 1,
rc_always_pace : 1, /* Socket option value Lock(a) */
rc_pace_to_cwnd : 1,
rc_pace_fill_if_rttin_range : 1,
rc_srtt_measure_made : 1;
uint8_t app_limited_needs_set : 1,
use_fixed_rate : 1,
rc_has_collapsed : 1,
r_cwnd_was_clamped : 1,
r_clamped_gets_lower : 1,
rack_hdrw_pacing : 1, /* We are doing Hardware pacing */
rack_hdw_pace_ena : 1, /* Is hardware pacing enabled? */
rack_attempt_hdwr_pace : 1; /* Did we attempt hdwr pacing (if allowed) */
uint8_t rack_tlp_threshold_use : 3, /* only 1, 2 and 3 used so far */
rack_rec_nonrxt_use_cr : 1,
rack_enable_scwnd : 1,
rack_attempted_scwnd : 1,
rack_no_prr : 1,
rack_scwnd_is_idle : 1;
uint8_t rc_allow_data_af_clo: 1,
delayed_ack : 1,
set_pacing_done_a_iw : 1,
use_rack_rr : 1,
alloc_limit_reported : 1,
sack_attack_disable : 1,
do_detection : 1,
rc_force_max_seg : 1;
uint8_t r_early : 1,
r_late : 1,
r_wanted_output: 1,
r_rr_config : 2,
r_persist_lt_bw_off : 1,
r_collapse_point_valid : 1,
dgp_on : 1;
uint16_t rc_init_win : 8,
rc_gp_rtt_set : 1,
rc_gp_dyn_mul : 1,
rc_gp_saw_rec : 1,
rc_gp_saw_ca : 1,
rc_gp_saw_ss : 1,
rc_gp_no_rec_chg : 1,
in_probe_rtt : 1,
measure_saw_probe_rtt : 1;
/* Cache line 2 0x40 */
struct rack_control r_ctl;
} __aligned(CACHE_LINE_SIZE);
#endif
#endif
Mini Shell