6edfc10ca5
This commit will add a new concept to rack, tracepoints. A tracepoint is a defined point inserted into the code (3 are included in this initial patch) that allows a developer to insert a point that might be of interest. The developer numbers the point in the tcp_rack.h file and then can use sysctl to enable that (or all) trace points. A limit is also given to how many BB logged connections will turn on so that a box is not overrun by BB logging. Reviewed by: tuexen Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D34898
666 lines
24 KiB
C
666 lines
24 KiB
C
/*-
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* Copyright (c) 2016-2020 Netflix, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NETINET_TCP_RACK_H_
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#define _NETINET_TCP_RACK_H_
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#define RACK_ACKED 0x000001/* The remote endpoint acked this */
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#define RACK_TO_REXT 0x000002/* A timeout occured on this sendmap entry */
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#define RACK_DEFERRED 0x000004/* We can't use this for RTT calc - not used */
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#define RACK_OVERMAX 0x000008/* We have more retran's then we can fit */
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#define RACK_SACK_PASSED 0x000010/* A sack was done above this block */
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#define RACK_WAS_SACKPASS 0x000020/* We retransmitted due to SACK pass */
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#define RACK_HAS_FIN 0x000040/* segment is sent with fin */
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#define RACK_TLP 0x000080/* segment sent as tail-loss-probe */
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#define RACK_RWND_COLLAPSED 0x000100/* The peer collapsed the rwnd on the segment */
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#define RACK_APP_LIMITED 0x000200/* We went app limited after this send */
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#define RACK_WAS_ACKED 0x000400/* a RTO undid the ack, but it already had a rtt calc done */
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#define RACK_HAS_SYN 0x000800/* SYN is on this guy */
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#define RACK_SENT_W_DSACK 0x001000/* Sent with a dsack */
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#define RACK_SENT_SP 0x002000/* sent in slow path */
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#define RACK_SENT_FP 0x004000/* sent in fast path */
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#define RACK_HAD_PUSH 0x008000/* Push was sent on original send */
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#define RACK_MUST_RXT 0x010000/* We must retransmit this rsm (non-sack/mtu chg)*/
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#define RACK_NUM_OF_RETRANS 3
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#define RACK_INITIAL_RTO 1000000 /* 1 second in microseconds */
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#define RACK_REQ_AVG 3 /* Must be less than 256 */
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struct rack_sendmap {
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TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */
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uint32_t r_start; /* Sequence number of the segment */
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uint32_t r_end; /* End seq, this is 1 beyond actually */
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uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */
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uint32_t r_flags : 24, /* Flags as defined above */
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r_rtr_cnt : 8; /* Retran count, index this -1 to get time */
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struct mbuf *m;
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uint32_t soff;
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uint32_t orig_m_len;
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uint32_t r_nseq_appl; /* If this one is app limited, this is the nxt seq limited */
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uint8_t r_dupack; /* Dup ack count */
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uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */
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uint8_t r_limit_type; /* is this entry counted against a limit? */
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uint8_t r_just_ret : 1, /* After sending, the next pkt was just returned, i.e. limited */
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r_one_out_nr : 1, /* Special case 1 outstanding and not in recovery */
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r_no_rtt_allowed : 1, /* No rtt measurement allowed */
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r_hw_tls : 1,
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r_avail : 4;
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uint64_t r_tim_lastsent[RACK_NUM_OF_RETRANS];
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uint64_t r_ack_arrival; /* This is the time of ack-arrival (if SACK'd) */
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RB_ENTRY(rack_sendmap) r_next; /* RB Tree next */
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uint32_t r_fas; /* Flight at send */
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};
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struct deferred_opt_list {
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TAILQ_ENTRY(deferred_opt_list) next;
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int optname;
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uint64_t optval;
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};
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/*
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* Timestamps in the rack sendmap are now moving to be
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* uint64_t's. This means that if you want a uint32_t
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* usec timestamp (the old usecond timestamp) you simply have
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* to cast it to uint32_t. The reason we do this is not for
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* wrap, but we need to get back, at times, to the millisecond
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* timestamp that is used in the TSTMP option. To do this we
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* can use the rack_ts_to_msec() inline below which can take
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* the 64bit ts and make into the correct timestamp millisecond
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* wise. Thats not possible with the 32bit usecond timestamp since
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* the seconds wrap too quickly to cover all bases.
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*
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* There are quite a few places in rack where I simply cast
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* back to uint32_t and then end up using the TSTMP_XX()
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* macros. This is ok, but we could do simple compares if
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* we ever decided to move all of those variables to 64 bits
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* as well.
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*/
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inline uint64_t
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rack_to_usec_ts(struct timeval *tv)
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{
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return ((tv->tv_sec * HPTS_USEC_IN_SEC) + tv->tv_usec);
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}
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inline uint32_t
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rack_ts_to_msec(uint64_t ts)
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{
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return((uint32_t)(ts / HPTS_MSEC_IN_SEC));
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}
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RB_HEAD(rack_rb_tree_head, rack_sendmap);
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TAILQ_HEAD(rack_head, rack_sendmap);
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TAILQ_HEAD(def_opt_head, deferred_opt_list);
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/* Map change logging */
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#define MAP_MERGE 0x01
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#define MAP_SPLIT 0x02
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#define MAP_NEW 0x03
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#define MAP_SACK_M1 0x04
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#define MAP_SACK_M2 0x05
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#define MAP_SACK_M3 0x06
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#define MAP_SACK_M4 0x07
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#define MAP_SACK_M5 0x08
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#define MAP_FREE 0x09
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#define MAP_TRIM_HEAD 0x0a
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#define RACK_LIMIT_TYPE_SPLIT 1
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/*
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* We use the rate sample structure to
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* assist in single sack/ack rate and rtt
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* calculation. In the future we will expand
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* this in BBR to do forward rate sample
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* b/w estimation.
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*/
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#define RACK_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */
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#define RACK_RTT_VALID 0x00000002 /* We have at least one valid RTT */
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struct rack_rtt_sample {
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uint32_t rs_flags;
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uint32_t rs_rtt_lowest;
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uint32_t rs_rtt_highest;
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uint32_t rs_rtt_cnt;
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uint32_t rs_us_rtt;
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int32_t confidence;
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uint64_t rs_rtt_tot;
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uint16_t rs_us_rtrcnt;
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};
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#define RACK_LOG_TYPE_ACK 0x01
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#define RACK_LOG_TYPE_OUT 0x02
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#define RACK_LOG_TYPE_TO 0x03
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#define RACK_LOG_TYPE_ALLOC 0x04
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#define RACK_LOG_TYPE_FREE 0x05
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/*
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* Magic numbers for logging timeout events if the
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* logging is enabled.
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*/
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#define RACK_TO_FRM_TMR 1
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#define RACK_TO_FRM_TLP 2
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#define RACK_TO_FRM_RACK 3
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#define RACK_TO_FRM_KEEP 4
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#define RACK_TO_FRM_PERSIST 5
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#define RACK_TO_FRM_DELACK 6
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struct rack_opts_stats {
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uint64_t tcp_rack_tlp_reduce;
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uint64_t tcp_rack_pace_always;
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uint64_t tcp_rack_pace_reduce;
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uint64_t tcp_rack_max_seg;
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uint64_t tcp_rack_prr_sendalot;
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uint64_t tcp_rack_min_to;
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uint64_t tcp_rack_early_seg;
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uint64_t tcp_rack_reord_thresh;
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uint64_t tcp_rack_reord_fade;
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uint64_t tcp_rack_tlp_thresh;
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uint64_t tcp_rack_pkt_delay;
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uint64_t tcp_rack_tlp_inc_var;
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uint64_t tcp_tlp_use;
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uint64_t tcp_rack_idle_reduce;
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uint64_t tcp_rack_idle_reduce_high;
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uint64_t rack_no_timer_in_hpts;
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uint64_t tcp_rack_min_pace_seg;
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uint64_t tcp_rack_pace_rate_ca;
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uint64_t tcp_rack_rr;
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uint64_t tcp_rack_do_detection;
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uint64_t tcp_rack_rrr_no_conf_rate;
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uint64_t tcp_initial_rate;
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uint64_t tcp_initial_win;
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uint64_t tcp_hdwr_pacing;
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uint64_t tcp_gp_inc_ss;
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uint64_t tcp_gp_inc_ca;
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uint64_t tcp_gp_inc_rec;
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uint64_t tcp_rack_force_max_seg;
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uint64_t tcp_rack_pace_rate_ss;
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uint64_t tcp_rack_pace_rate_rec;
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/* Temp counters for dsack */
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uint64_t tcp_sack_path_1;
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uint64_t tcp_sack_path_2a;
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uint64_t tcp_sack_path_2b;
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uint64_t tcp_sack_path_3;
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uint64_t tcp_sack_path_4;
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/* non temp counters */
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uint64_t tcp_rack_scwnd;
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uint64_t tcp_rack_noprr;
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uint64_t tcp_rack_cfg_rate;
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uint64_t tcp_timely_dyn;
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uint64_t tcp_rack_mbufq;
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uint64_t tcp_fillcw;
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uint64_t tcp_npush;
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uint64_t tcp_lscwnd;
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uint64_t tcp_profile;
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uint64_t tcp_hdwr_rate_cap;
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uint64_t tcp_pacing_rate_cap;
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uint64_t tcp_pacing_up_only;
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uint64_t tcp_use_cmp_acks;
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uint64_t tcp_rack_abc_val;
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uint64_t tcp_rec_abc_val;
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uint64_t tcp_rack_measure_cnt;
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uint64_t tcp_rack_delayed_ack;
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uint64_t tcp_rack_rtt_use;
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uint64_t tcp_data_after_close;
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uint64_t tcp_defer_opt;
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uint64_t tcp_rack_fastrsm_hack;
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uint64_t tcp_rack_beta;
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uint64_t tcp_rack_beta_ecn;
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uint64_t tcp_rack_timer_slop;
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uint64_t tcp_rack_dsack_opt;
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};
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/* RTT shrink reasons */
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#define RACK_RTTS_INIT 0
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#define RACK_RTTS_NEWRTT 1
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#define RACK_RTTS_EXITPROBE 2
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#define RACK_RTTS_ENTERPROBE 3
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#define RACK_RTTS_REACHTARGET 4
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#define RACK_RTTS_SEEHBP 5
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#define RACK_RTTS_NOBACKOFF 6
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#define RACK_RTTS_SAFETY 7
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#define RACK_USE_BEG 1
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#define RACK_USE_END 2
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#define RACK_USE_END_OR_THACK 3
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#define TLP_USE_ID 1 /* Internet draft behavior */
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#define TLP_USE_TWO_ONE 2 /* Use 2.1 behavior */
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#define TLP_USE_TWO_TWO 3 /* Use 2.2 behavior */
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#define RACK_MIN_BW 8000 /* 64kbps in Bps */
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/* Rack quality indicators for GPUT measurements */
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#define RACK_QUALITY_NONE 0 /* No quality stated */
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#define RACK_QUALITY_HIGH 1 /* A normal measurement of a GP RTT */
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#define RACK_QUALITY_APPLIMITED 2 /* An app limited case that may be of lower quality */
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#define RACK_QUALITY_PERSIST 3 /* A measurement where we went into persists */
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#define RACK_QUALITY_PROBERTT 4 /* A measurement where we went into or exited probe RTT */
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#define RACK_QUALITY_ALLACKED 5 /* All data is now acknowledged */
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/*********************/
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/* Rack Trace points */
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/*********************/
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/*
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* Rack trace points are interesting points within
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* the rack code that the author/debugger may want
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* to have BB logging enabled if we hit that point.
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* In order to enable a trace point you set the
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* sysctl var net.inet.tcp.<stack>.tp.number to
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* one of the numbers listed below. You also
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* must make sure net.inet.tcp.<stack>.tp.bbmode is
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* non-zero, the default is 4 for continous tracing.
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* You also set in the number of connections you want
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* have get BB logs in net.inet.tcp.<stack>.tp.count.
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*
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* Count will decrement every time BB logging is assigned
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* to a connection that hit your tracepoint.
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*
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* You can enable all trace points by setting the number
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* to 0xffffffff. You can disable all trace points by
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* setting number to zero (or count to 0).
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*
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* Below are the enumerated list of tracepoints that
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* have currently been defined in the code. Add more
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* as you add a call to rack_trace_point(rack, <name>);
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* where <name> is defined below.
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*/
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#define RACK_TP_HWENOBUF 0x00000001 /* When we are doing hardware pacing and hit enobufs */
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#define RACK_TP_ENOBUF 0x00000002 /* When we hit enobufs with software pacing */
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#define RACK_TP_COLLAPSED_WND 0x00000003 /* When a peer to collapses its rwnd on us */
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#define MIN_GP_WIN 6 /* We need at least 6 MSS in a GP measurement */
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#ifdef _KERNEL
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#define RACK_OPTS_SIZE (sizeof(struct rack_opts_stats)/sizeof(uint64_t))
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extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE];
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#define RACK_OPTS_ADD(name, amm) counter_u64_add(rack_opts_arry[(offsetof(struct rack_opts_stats, name)/sizeof(uint64_t))], (amm))
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#define RACK_OPTS_INC(name) RACK_OPTS_ADD(name, 1)
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#endif
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/*
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* As we get each SACK we wade through the
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* rc_map and mark off what is acked.
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* We also increment rc_sacked as well.
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*
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* We also pay attention to missing entries
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* based on the time and possibly mark them
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* for retransmit. If we do and we are not already
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* in recovery we enter recovery. In doing
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* so we claer prr_delivered/holes_rxt and prr_sent_dur_rec.
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* We also setup rc_next/rc_snd_nxt/rc_send_end so
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* we will know where to send from. When not in
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* recovery rc_next will be NULL and rc_snd_nxt should
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* equal snd_max.
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*
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* Whenever we retransmit from recovery we increment
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* rc_holes_rxt as we retran a block and mark it as retransmitted
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* with the time it was sent. During non-recovery sending we
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* add to our map and note the time down of any send expanding
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* the rc_map at the tail and moving rc_snd_nxt up with snd_max.
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*
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* In recovery during SACK/ACK processing if a chunk has
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* been retransmitted and it is now acked, we decrement rc_holes_rxt.
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* When we retransmit from the scoreboard we use
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* rc_next and rc_snd_nxt/rc_send_end to help us
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* find what needs to be retran.
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*
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* To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt
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* This gets us the effect of RFC6675 pipe, counting twice for
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* bytes retransmitted.
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*/
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#define TT_RACK_FR_TMR 0x2000
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/*
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* Locking for the rack control block.
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* a) Locked by INP_WLOCK
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* b) Locked by the hpts-mutex
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*
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*/
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#define RACK_GP_HIST 4 /* How much goodput history do we maintain? */
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#define RACK_NUM_FSB_DEBUG 16
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#ifdef _KERNEL
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struct rack_fast_send_blk {
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uint32_t left_to_send;
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uint16_t tcp_ip_hdr_len;
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uint8_t tcp_flags;
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uint8_t hoplimit;
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uint8_t *tcp_ip_hdr;
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uint32_t recwin;
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uint32_t off;
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struct tcphdr *th;
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struct udphdr *udp;
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struct mbuf *m;
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uint32_t o_m_len;
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uint32_t rfo_apply_push : 1,
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hw_tls : 1,
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unused : 30;
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};
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struct rack_control {
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/* Second cache line 0x40 from tcp_rack */
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struct rack_rb_tree_head rc_mtree; /* Tree of all segments Lock(a) */
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struct rack_head rc_tmap; /* List in transmit order Lock(a) */
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struct rack_sendmap *rc_tlpsend; /* Remembered place for
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* tlp_sending Lock(a) */
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struct rack_sendmap *rc_resend; /* something we have been asked to
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* resend */
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struct rack_fast_send_blk fsb; /* The fast-send block */
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uint32_t timer_slop;
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uint32_t input_pkt;
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uint32_t saved_input_pkt;
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uint32_t rc_hpts_flags;
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uint32_t rc_fixed_pacing_rate_ca;
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uint32_t rc_fixed_pacing_rate_rec;
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uint32_t rc_fixed_pacing_rate_ss;
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uint32_t cwnd_to_use; /* The cwnd in use */
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uint32_t rc_timer_exp; /* If a timer ticks of expiry */
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uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */
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uint32_t rc_rack_largest_cwnd; /* Largest CWND we have seen Lock(a) */
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/* Third Cache line 0x80 */
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struct rack_head rc_free; /* Allocation array */
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uint64_t last_hw_bw_req;
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uint64_t crte_prev_rate;
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uint64_t bw_rate_cap;
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uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */
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uint32_t rc_tlp_new_data; /* we need to send new-data on a TLP
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* Lock(a) */
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uint32_t rc_prr_out; /* bytes sent during recovery Lock(a) */
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uint32_t rc_prr_recovery_fs; /* recovery fs point Lock(a) */
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uint32_t rc_prr_sndcnt; /* Prr sndcnt Lock(a) */
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uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */
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uint32_t last_sent_tlp_seq; /* Last tlp sequence that was retransmitted Lock(a) */
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uint32_t rc_prr_delivered; /* during recovery prr var Lock(a) */
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uint16_t rc_tlp_cnt_out; /* count of times we have sent a TLP without new data */
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uint16_t last_sent_tlp_len; /* Number of bytes in the last sent tlp */
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uint32_t rc_loss_count; /* How many bytes have been retransmitted
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* Lock(a) */
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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_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;
|
|
int32_t rc_rtt_diff; /* Timely style rtt diff of our gp_srtt */
|
|
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 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 occured 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;
|
|
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 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 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;
|
|
};
|
|
#endif
|
|
|
|
#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
|
|
*/
|
|
|
|
#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; /* 0 - 5 normaly, less than or at 2 means its real low */
|
|
uint8_t no_prr_addback : 1,
|
|
gp_ready : 1,
|
|
defer_options: 1,
|
|
fast_rsm_hack: 1,
|
|
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,
|
|
avail_bytes : 2;
|
|
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; /* Socket option value Lock(a) */
|
|
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_dack_mode : 1, /* Mac O/S emulation of d-ack */
|
|
rc_dack_toggle : 1, /* For Mac O/S emulation of d-ack */
|
|
rc_gp_filled : 1,
|
|
rc_is_spare : 1;
|
|
uint8_t r_state; /* Current rack state Lock(a) */
|
|
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_rep_attack : 1,
|
|
r_rep_reverse : 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,
|
|
rc_avail_bit : 3;
|
|
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
|