From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuchung Cheng Subject: [PATCH v3 0/7] TCP Fast Open client Date: Thu, 19 Jul 2012 09:43:04 -0700 Message-ID: <1342716191-19196-1-git-send-email-ycheng@google.com> Cc: sivasankar@cs.ucsd.edu, netdev@vger.kernel.org, Yuchung Cheng To: davem@davemloft.net, hkchu@google.com, edumazet@google.com, ncardwell@google.com Return-path: Received: from mail-ee0-f74.google.com ([74.125.83.74]:53627 "EHLO mail-ee0-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751700Ab2GSQne (ORCPT ); Thu, 19 Jul 2012 12:43:34 -0400 Received: by eekb47 with SMTP id b47so157692eek.1 for ; Thu, 19 Jul 2012 09:43:32 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: ChangeLog since v2: - Added seqlock to update Fast Open metrics - Move TCP magic code in inet_wait_for_connect() to inet_stream_connect() - Move up MSG_FASTOPEN macro for better header formatting ChangeLog since v1: - Reduce tons of code by storing Fast Open stats in the TCP metrics :) - Clarify the purpose of using an experimental option in patch 1/7 This patch series implement the client functionality of TCP Fast Open. TCP Fast Open (TFO) allows data to be carried in the SYN and SYN-ACK packets and consumed by the receiving end during the initial connection handshake, thus providing a saving of up to one full round trip time (RTT) compared to standard TCP requiring a three-way handshake (3WHS) to complete before data can be exchanged. The protocol change is detailed in the IETF internet draft at http://www.ietf.org/id/draft-ietf-tcpm-fastopen-00.txt . The research paper (http://conferences.sigcomm.org/co-next/2011/papers/1569470463.pdf) studied the performance impact of HTTP using Fast Open, based on this Linux implementation and the Chrome browser. To use Fast Open, the client application (active SYN sender) must replace connect() socket call with sendmsg() or sendto() with the new MSG_FASTOPEN flag. If the server supports Fast Open the data exchange starts at TCP handshake. Otherwise the connection will automatically fall back to conventional TCP. Yuchung Cheng (7): net-tcp: Fast Open base net-tcp: Fast Open client - cookie cache net-tcp: Fast Open client - sending SYN-data net-tcp: Fast Open client - receiving SYN-ACK net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN) net-tcp: Fast Open client - detecting SYN-data drops net-tcp: Fast Open client - cookie-less mode Documentation/networking/ip-sysctl.txt | 13 +++ include/linux/snmp.h | 1 + include/linux/socket.h | 1 + include/linux/tcp.h | 17 ++++- include/net/inet_common.h | 6 +- include/net/tcp.h | 28 ++++++- net/ipv4/Makefile | 2 +- net/ipv4/af_inet.c | 29 +++++-- net/ipv4/proc.c | 1 + net/ipv4/syncookies.c | 2 +- net/ipv4/sysctl_net_ipv4.c | 7 ++ net/ipv4/tcp.c | 61 ++++++++++++- net/ipv4/tcp_fastopen.c | 11 +++ net/ipv4/tcp_input.c | 76 ++++++++++++++-- net/ipv4/tcp_ipv4.c | 5 +- net/ipv4/tcp_metrics.c | 61 +++++++++++++ net/ipv4/tcp_minisocks.c | 4 +- net/ipv4/tcp_output.c | 153 +++++++++++++++++++++++++++++--- net/ipv6/syncookies.c | 2 +- net/ipv6/tcp_ipv6.c | 2 +- 20 files changed, 438 insertions(+), 44 deletions(-) create mode 100644 net/ipv4/tcp_fastopen.c -- 1.7.7.3