linux-stable/include/linux/tcp.h
David S. Miller c1b4a7e695 [TCP]: Move to new TSO segmenting scheme.
Make TSO segment transmit size decisions at send time not earlier.

The basic scheme is that we try to build as large a TSO frame as
possible when pulling in the user data, but the size of the TSO frame
output to the card is determined at transmit time.

This is guided by tp->xmit_size_goal.  It is always set to a multiple
of MSS and tells sendmsg/sendpage how large an SKB to try and build.

Later, tcp_write_xmit() and tcp_push_one() chop up the packet if
necessary and conditions warrant.  These routines can also decide to
"defer" in order to wait for more ACKs to arrive and thus allow larger
TSO frames to be emitted.

A general observation is that TSO elongates the pipe, thus requiring a
larger congestion window and larger buffering especially at the sender
side.  Therefore, it is important that applications 1) get a large
enough socket send buffer (this is accomplished by our dynamic send
buffer expansion code) 2) do large enough writes.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-05 15:24:38 -07:00

416 lines
12 KiB
C

/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Definitions for the TCP protocol.
*
* Version: @(#)tcp.h 1.0.2 04/28/93
*
* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _LINUX_TCP_H
#define _LINUX_TCP_H
#include <linux/types.h>
#include <asm/byteorder.h>
struct tcphdr {
__u16 source;
__u16 dest;
__u32 seq;
__u32 ack_seq;
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u16 res1:4,
doff:4,
fin:1,
syn:1,
rst:1,
psh:1,
ack:1,
urg:1,
ece:1,
cwr:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
__u16 doff:4,
res1:4,
cwr:1,
ece:1,
urg:1,
ack:1,
psh:1,
rst:1,
syn:1,
fin:1;
#else
#error "Adjust your <asm/byteorder.h> defines"
#endif
__u16 window;
__u16 check;
__u16 urg_ptr;
};
enum {
TCP_ESTABLISHED = 1,
TCP_SYN_SENT,
TCP_SYN_RECV,
TCP_FIN_WAIT1,
TCP_FIN_WAIT2,
TCP_TIME_WAIT,
TCP_CLOSE,
TCP_CLOSE_WAIT,
TCP_LAST_ACK,
TCP_LISTEN,
TCP_CLOSING, /* now a valid state */
TCP_MAX_STATES /* Leave at the end! */
};
#define TCP_STATE_MASK 0xF
#define TCP_ACTION_FIN (1 << 7)
enum {
TCPF_ESTABLISHED = (1 << 1),
TCPF_SYN_SENT = (1 << 2),
TCPF_SYN_RECV = (1 << 3),
TCPF_FIN_WAIT1 = (1 << 4),
TCPF_FIN_WAIT2 = (1 << 5),
TCPF_TIME_WAIT = (1 << 6),
TCPF_CLOSE = (1 << 7),
TCPF_CLOSE_WAIT = (1 << 8),
TCPF_LAST_ACK = (1 << 9),
TCPF_LISTEN = (1 << 10),
TCPF_CLOSING = (1 << 11)
};
/*
* The union cast uses a gcc extension to avoid aliasing problems
* (union is compatible to any of its members)
* This means this part of the code is -fstrict-aliasing safe now.
*/
union tcp_word_hdr {
struct tcphdr hdr;
__u32 words[5];
};
#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
enum {
TCP_FLAG_CWR = __constant_htonl(0x00800000),
TCP_FLAG_ECE = __constant_htonl(0x00400000),
TCP_FLAG_URG = __constant_htonl(0x00200000),
TCP_FLAG_ACK = __constant_htonl(0x00100000),
TCP_FLAG_PSH = __constant_htonl(0x00080000),
TCP_FLAG_RST = __constant_htonl(0x00040000),
TCP_FLAG_SYN = __constant_htonl(0x00020000),
TCP_FLAG_FIN = __constant_htonl(0x00010000),
TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
};
/* TCP socket options */
#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
#define TCP_MAXSEG 2 /* Limit MSS */
#define TCP_CORK 3 /* Never send partially complete segments */
#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
#define TCP_KEEPINTVL 5 /* Interval between keepalives */
#define TCP_KEEPCNT 6 /* Number of keepalives before death */
#define TCP_SYNCNT 7 /* Number of SYN retransmits */
#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
#define TCP_INFO 11 /* Information about this connection. */
#define TCP_QUICKACK 12 /* Block/reenable quick acks */
#define TCP_CONGESTION 13 /* Congestion control algorithm */
#define TCPI_OPT_TIMESTAMPS 1
#define TCPI_OPT_SACK 2
#define TCPI_OPT_WSCALE 4
#define TCPI_OPT_ECN 8
enum tcp_ca_state
{
TCP_CA_Open = 0,
#define TCPF_CA_Open (1<<TCP_CA_Open)
TCP_CA_Disorder = 1,
#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
TCP_CA_CWR = 2,
#define TCPF_CA_CWR (1<<TCP_CA_CWR)
TCP_CA_Recovery = 3,
#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
TCP_CA_Loss = 4
#define TCPF_CA_Loss (1<<TCP_CA_Loss)
};
struct tcp_info
{
__u8 tcpi_state;
__u8 tcpi_ca_state;
__u8 tcpi_retransmits;
__u8 tcpi_probes;
__u8 tcpi_backoff;
__u8 tcpi_options;
__u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
__u32 tcpi_rto;
__u32 tcpi_ato;
__u32 tcpi_snd_mss;
__u32 tcpi_rcv_mss;
__u32 tcpi_unacked;
__u32 tcpi_sacked;
__u32 tcpi_lost;
__u32 tcpi_retrans;
__u32 tcpi_fackets;
/* Times. */
__u32 tcpi_last_data_sent;
__u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
__u32 tcpi_last_data_recv;
__u32 tcpi_last_ack_recv;
/* Metrics. */
__u32 tcpi_pmtu;
__u32 tcpi_rcv_ssthresh;
__u32 tcpi_rtt;
__u32 tcpi_rttvar;
__u32 tcpi_snd_ssthresh;
__u32 tcpi_snd_cwnd;
__u32 tcpi_advmss;
__u32 tcpi_reordering;
__u32 tcpi_rcv_rtt;
__u32 tcpi_rcv_space;
__u32 tcpi_total_retrans;
};
#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/sock.h>
/* This defines a selective acknowledgement block. */
struct tcp_sack_block {
__u32 start_seq;
__u32 end_seq;
};
struct tcp_options_received {
/* PAWS/RTTM data */
long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
__u32 ts_recent; /* Time stamp to echo next */
__u32 rcv_tsval; /* Time stamp value */
__u32 rcv_tsecr; /* Time stamp echo reply */
__u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */
tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */
dsack : 1, /* D-SACK is scheduled */
wscale_ok : 1, /* Wscale seen on SYN packet */
sack_ok : 4, /* SACK seen on SYN packet */
snd_wscale : 4, /* Window scaling received from sender */
rcv_wscale : 4; /* Window scaling to send to receiver */
/* SACKs data */
__u8 eff_sacks; /* Size of SACK array to send with next packet */
__u8 num_sacks; /* Number of SACK blocks */
__u16 user_mss; /* mss requested by user in ioctl */
__u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
};
struct tcp_request_sock {
struct inet_request_sock req;
__u32 rcv_isn;
__u32 snt_isn;
};
static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
{
return (struct tcp_request_sock *)req;
}
struct tcp_sock {
/* inet_sock has to be the first member of tcp_sock */
struct inet_sock inet;
int tcp_header_len; /* Bytes of tcp header to send */
/*
* Header prediction flags
* 0x5?10 << 16 + snd_wnd in net byte order
*/
__u32 pred_flags;
/*
* RFC793 variables by their proper names. This means you can
* read the code and the spec side by side (and laugh ...)
* See RFC793 and RFC1122. The RFC writes these in capitals.
*/
__u32 rcv_nxt; /* What we want to receive next */
__u32 snd_nxt; /* Next sequence we send */
__u32 snd_una; /* First byte we want an ack for */
__u32 snd_sml; /* Last byte of the most recently transmitted small packet */
__u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
__u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
struct tcp_bind_bucket *bind_hash;
/* Delayed ACK control data */
struct {
__u8 pending; /* ACK is pending */
__u8 quick; /* Scheduled number of quick acks */
__u8 pingpong; /* The session is interactive */
__u8 blocked; /* Delayed ACK was blocked by socket lock*/
__u32 ato; /* Predicted tick of soft clock */
unsigned long timeout; /* Currently scheduled timeout */
__u32 lrcvtime; /* timestamp of last received data packet*/
__u16 last_seg_size; /* Size of last incoming segment */
__u16 rcv_mss; /* MSS used for delayed ACK decisions */
} ack;
/* Data for direct copy to user */
struct {
struct sk_buff_head prequeue;
struct task_struct *task;
struct iovec *iov;
int memory;
int len;
} ucopy;
__u32 snd_wl1; /* Sequence for window update */
__u32 snd_wnd; /* The window we expect to receive */
__u32 max_window; /* Maximal window ever seen from peer */
__u32 pmtu_cookie; /* Last pmtu seen by socket */
__u32 mss_cache; /* Cached effective mss, not including SACKS */
__u16 xmit_size_goal; /* Goal for segmenting output packets */
__u16 ext_header_len; /* Network protocol overhead (IP/IPv6 options) */
__u8 ca_state; /* State of fast-retransmit machine */
__u8 retransmits; /* Number of unrecovered RTO timeouts. */
__u16 advmss; /* Advertised MSS */
__u32 window_clamp; /* Maximal window to advertise */
__u32 rcv_ssthresh; /* Current window clamp */
__u32 frto_highmark; /* snd_nxt when RTO occurred */
__u8 reordering; /* Packet reordering metric. */
__u8 frto_counter; /* Number of new acks after RTO */
__u8 unused;
__u8 defer_accept; /* User waits for some data after accept() */
/* RTT measurement */
__u32 srtt; /* smoothed round trip time << 3 */
__u32 mdev; /* medium deviation */
__u32 mdev_max; /* maximal mdev for the last rtt period */
__u32 rttvar; /* smoothed mdev_max */
__u32 rtt_seq; /* sequence number to update rttvar */
__u32 rto; /* retransmit timeout */
__u32 packets_out; /* Packets which are "in flight" */
__u32 left_out; /* Packets which leaved network */
__u32 retrans_out; /* Retransmitted packets out */
__u8 backoff; /* backoff */
/*
* Options received (usually on last packet, some only on SYN packets).
*/
__u8 nonagle; /* Disable Nagle algorithm? */
__u8 keepalive_probes; /* num of allowed keep alive probes */
__u8 probes_out; /* unanswered 0 window probes */
struct tcp_options_received rx_opt;
/*
* Slow start and congestion control (see also Nagle, and Karn & Partridge)
*/
__u32 snd_ssthresh; /* Slow start size threshold */
__u32 snd_cwnd; /* Sending congestion window */
__u16 snd_cwnd_cnt; /* Linear increase counter */
__u16 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
__u32 snd_cwnd_used;
__u32 snd_cwnd_stamp;
/* Two commonly used timers in both sender and receiver paths. */
unsigned long timeout;
struct timer_list retransmit_timer; /* Resend (no ack) */
struct timer_list delack_timer; /* Ack delay */
struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
struct tcp_func *af_specific; /* Operations which are AF_INET{4,6} specific */
__u32 rcv_wnd; /* Current receiver window */
__u32 rcv_wup; /* rcv_nxt on last window update sent */
__u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
__u32 pushed_seq; /* Last pushed seq, required to talk to windows */
__u32 copied_seq; /* Head of yet unread data */
/* SACKs data */
struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
__u8 syn_retries; /* num of allowed syn retries */
__u8 ecn_flags; /* ECN status bits. */
__u16 prior_ssthresh; /* ssthresh saved at recovery start */
__u32 lost_out; /* Lost packets */
__u32 sacked_out; /* SACK'd packets */
__u32 fackets_out; /* FACK'd packets */
__u32 high_seq; /* snd_nxt at onset of congestion */
__u32 retrans_stamp; /* Timestamp of the last retransmit,
* also used in SYN-SENT to remember stamp of
* the first SYN. */
__u32 undo_marker; /* tracking retrans started here. */
int undo_retrans; /* number of undoable retransmissions. */
__u32 urg_seq; /* Seq of received urgent pointer */
__u16 urg_data; /* Saved octet of OOB data and control flags */
__u8 pending; /* Scheduled timer event */
__u8 urg_mode; /* In urgent mode */
__u32 snd_up; /* Urgent pointer */
__u32 total_retrans; /* Total retransmits for entire connection */
struct request_sock_queue accept_queue; /* FIFO of established children */
unsigned int keepalive_time; /* time before keep alive takes place */
unsigned int keepalive_intvl; /* time interval between keep alive probes */
int linger2;
unsigned long last_synq_overflow;
/* Receiver side RTT estimation */
struct {
__u32 rtt;
__u32 seq;
__u32 time;
} rcv_rtt_est;
/* Receiver queue space */
struct {
int space;
__u32 seq;
__u32 time;
} rcvq_space;
/* Pluggable TCP congestion control hook */
struct tcp_congestion_ops *ca_ops;
u32 ca_priv[16];
#define TCP_CA_PRIV_SIZE (16*sizeof(u32))
};
static inline struct tcp_sock *tcp_sk(const struct sock *sk)
{
return (struct tcp_sock *)sk;
}
static inline void *tcp_ca(const struct tcp_sock *tp)
{
return (void *) tp->ca_priv;
}
#endif
#endif /* _LINUX_TCP_H */