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head/sys/netinet/tcp_stacks/tcp_rack.h

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/*-
* Copyright (c) 2016
* Netflix Inc. All rights reserved.
*
* 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_RACK_H_
#define _NETINET_TCP_RACK_H_
#define RACK_ACKED 0x0001/* The remote endpoint acked this */
#define RACK_TO_MIXED 0x0002/* A timeout occured that mixed the send order */
#define RACK_DEFERRED 0x0004/* We can't use this for RTT calc */
#define RACK_OVERMAX 0x0008/* We have more retran's then we can fit */
#define RACK_SACK_PASSED 0x0010/* A sack was done above this block */
#define RACK_WAS_SACKPASS 0x0020/* We retransmitted due to SACK pass */
#define RACK_HAS_FIN 0x0040/* segment is sent with fin */
#define RACK_TLP 0x0080/* segment sent as tail-loss-probe */
#define RACK_NUM_OF_RETRANS 3
#define RACK_INITIAL_RTO 1000 /* 1 second in milli seconds */
struct rack_sendmap {
TAILQ_ENTRY(rack_sendmap) r_next; /* seq number arrayed next */
TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */
uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
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 */
uint16_t r_rtr_cnt; /* Retran count, index this -1 to get time
* sent */
uint8_t r_flags; /* Flags as defined above */
uint8_t r_sndcnt; /* Retran count, not limited by
* RACK_NUM_OF_RETRANS */
uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */
uint8_t r_resv[3];
};
TAILQ_HEAD(rack_head, rack_sendmap);
/*
* 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;
uint64_t rs_rtt_tot;
};
#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
struct rack_log {
union {
struct rack_sendmap *rsm; /* For alloc/free */
uint64_t sb_acc;/* For out/ack or t-o */
};
uint32_t th_seq;
uint32_t th_ack;
uint32_t snd_una;
uint32_t snd_nxt; /* th_win for TYPE_ACK */
uint32_t snd_max;
uint32_t blk_start[4];
uint32_t blk_end[4];
uint8_t type;
uint8_t n_sackblks;
uint16_t len; /* Timeout T3=1, TLP=2, RACK=3 */
};
/*
* 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_prop_rate;
uint64_t tcp_rack_prop;
uint64_t tcp_rack_tlp_reduce;
uint64_t tcp_rack_early_recov;
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_min_pace;
};
#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 */
#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
*
*/
struct rack_control {
/* Second cache line 0x40 from tcp_rack */
struct rack_head rc_map;/* List 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 */
uint32_t rc_hpts_flags;
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 */
uint32_t rc_time_last_sent; /* Time we last sent some data and
* logged it Lock(a). */
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 rc_last_tlp_seq; /* Last tlp sequence Lock(a) */
uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */
uint16_t rc_tlp_send_cnt; /* Number of TLP sends we have done
* since peer spoke to us Lock(a) */
uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent
* rc_last_tlp_seq Lock(a) */
uint32_t rc_loss_count; /* During recovery how many segments were lost
* 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) */
/* Variables to track bad retransmits and recover */
uint32_t rc_rsm_start; /* RSM seq number we retransmitted Lock(a) */
uint32_t rc_cwnd_at; /* cwnd at the retransmit Lock(a) */
uint32_t rc_ssthresh_at;/* ssthresh at the retransmit 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_notused;
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_next; /* remembered place where we next
* retransmit at Lock(a) */
struct rack_sendmap *rc_rsm_at_retran; /* Debug variable kept for
* cache line alignment
* Lock(a) */
/* Cache line split 0x100 */
struct sack_filter rack_sf;
/* Cache line split 0x140 */
/* Flags for various things */
struct rack_rtt_sample rack_rs;
uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */
uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */
uint16_t rc_reorder_shift; /* Socket option value Lock(a) */
uint16_t rc_pkt_delay; /* Socket option value Lock(a) */
uint8_t rc_prop_rate; /* Socket option value Lock(a) */
uint8_t rc_prop_reduce; /* Socket option value Lock(a) */
uint8_t rc_tlp_cwnd_reduce; /* Socket option value Lock(a) */
uint8_t rc_early_recovery; /* Socket option value Lock(a) */
uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */
uint8_t rc_min_to; /* Socket option value Lock(a) */
uint8_t rc_prr_inc_var; /* Socket option value Lock(a) */
uint8_t rc_tlp_rtx_out; /* This is TLPRtxOut in the draft */
uint8_t rc_rate_sample_method;
};
#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, int32_t *, uint32_t, int, int); /* Lock(a) */
struct tcpcb *rc_tp; /* The tcpcb Lock(a) */
struct inpcb *rc_inp; /* The inpcb Lock(a) */
uint32_t rc_free_cnt; /* Number of free entries on the rc_free list
* Lock(a) */
uint32_t rc_rack_rtt; /* RACK-RTT Lock(a) */
uint16_t r_wanted_output; /* Output routine wanted to be called */
uint16_t r_cpu; /* CPU that the INP is running on Lock(a) */
uint16_t rc_pace_max_segs; /* Socket option value Lock(a) */
uint16_t rc_pace_reduce;/* Socket option value Lock(a) */
uint8_t r_state; /* Current rack state Lock(a) */
uint8_t rc_tmr_stopped : 7,
t_timers_stopped : 1;
uint8_t rc_enobuf; /* count of enobufs on connection provides
* backoff Lock(a) */
uint8_t r_timer_override : 1, /* hpts override Lock(a) */
r_tlp_running : 1, /* Running from a TLP timeout Lock(a) */
r_is_v6 : 1, /* V6 pcb Lock(a) */
rc_in_persist : 1,
rc_last_pto_set : 1, /* XXX not used */
rc_tlp_in_progress : 1,
rc_always_pace : 1, /* Socket option value Lock(a) */
rc_timer_up : 1; /* The rack timer is up flag Lock(a) */
uint8_t r_idle_reduce_largest : 1,
r_enforce_min_pace : 2,
r_min_pace_seg_thresh : 5;
uint8_t rack_tlp_threshold_use;
uint8_t rc_allow_data_af_clo: 1,
delayed_ack : 1,
rc_avail : 6;
uint8_t r_resv[2]; /* Fill to cache line boundary */
/* Cache line 2 0x40 */
struct rack_control r_ctl;
} __aligned(CACHE_LINE_SIZE);
#endif
#endif