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1c885808e4
This patch exports the sender chronograph stats via the socket SO_TIMESTAMPING channel. Currently we can instrument how long a particular application unit of data was queued in TCP by tracking SOF_TIMESTAMPING_TX_SOFTWARE and SOF_TIMESTAMPING_TX_SCHED. Having these sender chronograph stats exported simultaneously along with these timestamps allow further breaking down the various sender limitation. For example, a video server can tell if a particular chunk of video on a connection takes a long time to deliver because TCP was experiencing small receive window. It is not possible to tell before this patch without packet traces. To prepare these stats, the user needs to set SOF_TIMESTAMPING_OPT_STATS and SOF_TIMESTAMPING_OPT_TSONLY flags while requesting other SOF_TIMESTAMPING TX timestamps. When the timestamps are available in the error queue, the stats are returned in a separate control message of type SCM_TIMESTAMPING_OPT_STATS, in a list of TLVs (struct nlattr) of types: TCP_NLA_BUSY_TIME, TCP_NLA_RWND_LIMITED, TCP_NLA_SNDBUF_LIMITED. Unit is microsecond. Signed-off-by: Francis Yan <francisyyan@gmail.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the TCP protocol.
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*
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* Version: @(#)tcp.h 1.0.2 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_TCP_H
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#define _UAPI_LINUX_TCP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <linux/socket.h>
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struct tcphdr {
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__be16 source;
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__be16 dest;
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__be32 seq;
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__be32 ack_seq;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u16 res1:4,
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doff:4,
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fin:1,
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syn:1,
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rst:1,
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psh:1,
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ack:1,
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urg:1,
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ece:1,
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cwr:1;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u16 doff:4,
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res1:4,
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cwr:1,
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ece:1,
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urg:1,
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ack:1,
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psh:1,
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rst:1,
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syn:1,
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fin:1;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__be16 window;
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__sum16 check;
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__be16 urg_ptr;
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};
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/*
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* The union cast uses a gcc extension to avoid aliasing problems
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* (union is compatible to any of its members)
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* This means this part of the code is -fstrict-aliasing safe now.
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*/
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union tcp_word_hdr {
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struct tcphdr hdr;
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__be32 words[5];
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};
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#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
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enum {
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TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
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TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
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TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
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TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
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TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
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TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
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TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
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TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
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TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
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TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
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};
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/*
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* TCP general constants
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*/
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#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
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#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
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/* TCP socket options */
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#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
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#define TCP_MAXSEG 2 /* Limit MSS */
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#define TCP_CORK 3 /* Never send partially complete segments */
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#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
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#define TCP_KEEPINTVL 5 /* Interval between keepalives */
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#define TCP_KEEPCNT 6 /* Number of keepalives before death */
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#define TCP_SYNCNT 7 /* Number of SYN retransmits */
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#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
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#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
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#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
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#define TCP_INFO 11 /* Information about this connection. */
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#define TCP_QUICKACK 12 /* Block/reenable quick acks */
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#define TCP_CONGESTION 13 /* Congestion control algorithm */
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#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
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#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
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#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
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#define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */
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#define TCP_REPAIR 19 /* TCP sock is under repair right now */
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#define TCP_REPAIR_QUEUE 20
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#define TCP_QUEUE_SEQ 21
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#define TCP_REPAIR_OPTIONS 22
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#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
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#define TCP_TIMESTAMP 24
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#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */
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#define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */
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#define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */
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#define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */
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#define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */
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struct tcp_repair_opt {
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__u32 opt_code;
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__u32 opt_val;
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};
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struct tcp_repair_window {
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__u32 snd_wl1;
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__u32 snd_wnd;
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__u32 max_window;
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__u32 rcv_wnd;
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__u32 rcv_wup;
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};
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enum {
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TCP_NO_QUEUE,
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TCP_RECV_QUEUE,
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TCP_SEND_QUEUE,
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TCP_QUEUES_NR,
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};
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/* for TCP_INFO socket option */
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#define TCPI_OPT_TIMESTAMPS 1
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#define TCPI_OPT_SACK 2
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#define TCPI_OPT_WSCALE 4
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#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
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#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
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#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
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enum tcp_ca_state {
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TCP_CA_Open = 0,
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#define TCPF_CA_Open (1<<TCP_CA_Open)
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TCP_CA_Disorder = 1,
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#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
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TCP_CA_CWR = 2,
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#define TCPF_CA_CWR (1<<TCP_CA_CWR)
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TCP_CA_Recovery = 3,
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#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
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TCP_CA_Loss = 4
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#define TCPF_CA_Loss (1<<TCP_CA_Loss)
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};
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struct tcp_info {
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__u8 tcpi_state;
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__u8 tcpi_ca_state;
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__u8 tcpi_retransmits;
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__u8 tcpi_probes;
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__u8 tcpi_backoff;
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__u8 tcpi_options;
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__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
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__u8 tcpi_delivery_rate_app_limited:1;
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__u32 tcpi_rto;
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__u32 tcpi_ato;
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__u32 tcpi_snd_mss;
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__u32 tcpi_rcv_mss;
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__u32 tcpi_unacked;
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__u32 tcpi_sacked;
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__u32 tcpi_lost;
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__u32 tcpi_retrans;
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__u32 tcpi_fackets;
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/* Times. */
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__u32 tcpi_last_data_sent;
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__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
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__u32 tcpi_last_data_recv;
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__u32 tcpi_last_ack_recv;
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/* Metrics. */
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__u32 tcpi_pmtu;
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__u32 tcpi_rcv_ssthresh;
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__u32 tcpi_rtt;
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__u32 tcpi_rttvar;
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__u32 tcpi_snd_ssthresh;
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__u32 tcpi_snd_cwnd;
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__u32 tcpi_advmss;
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__u32 tcpi_reordering;
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__u32 tcpi_rcv_rtt;
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__u32 tcpi_rcv_space;
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__u32 tcpi_total_retrans;
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__u64 tcpi_pacing_rate;
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__u64 tcpi_max_pacing_rate;
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__u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
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__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
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__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
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__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
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__u32 tcpi_notsent_bytes;
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__u32 tcpi_min_rtt;
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__u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
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__u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
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__u64 tcpi_delivery_rate;
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__u64 tcpi_busy_time; /* Time (usec) busy sending data */
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__u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */
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__u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
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};
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/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */
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enum {
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TCP_NLA_PAD,
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TCP_NLA_BUSY, /* Time (usec) busy sending data */
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TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */
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TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */
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};
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/* for TCP_MD5SIG socket option */
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#define TCP_MD5SIG_MAXKEYLEN 80
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struct tcp_md5sig {
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struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
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__u16 __tcpm_pad1; /* zero */
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__u16 tcpm_keylen; /* key length */
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__u32 __tcpm_pad2; /* zero */
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__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
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};
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#endif /* _UAPI_LINUX_TCP_H */
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