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Commit 0d41cca4 authored by Yuchung Cheng's avatar Yuchung Cheng Committed by David S. Miller
Browse files

tcp: enable sockets to use MSG_FASTOPEN by default 



Applications have started to use Fast Open (e.g., Chrome browser has
such an optional flag) and the feature has gone through several
generations of kernels since 3.7 with many real network tests. It's
time to enable this flag by default for applications to test more
conveniently and extensively.

Signed-off-by: default avatarYuchung Cheng <ycheng@google.com>
Signed-off-by: default avatarNeal Cardwell <ncardwell@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f8785c55

Documentation/networking/ip-sysctl.txt

+2 −2
Original line number Diff line number Diff line
@@ -451,7 +451,7 @@ tcp_fastopen - INTEGER 
	connect() to perform a TCP handshake automatically.



	The values (bitmap) are

	1: Enables sending data in the opening SYN on the client.

	1: Enables sending data in the opening SYN on the client w/ MSG_FASTOPEN.

	2: Enables TCP Fast Open on the server side, i.e., allowing data in

	   a SYN packet to be accepted and passed to the application before

	   3-way hand shake finishes.
@@ -464,7 +464,7 @@ tcp_fastopen - INTEGER 
	   different ways of setting max_qlen without the TCP_FASTOPEN socket

	   option.



	Default: 0

	Default: 1



	Note that the client & server side Fast Open flags (1 and 2

	respectively) must be also enabled before the rest of flags can take

net/ipv4/tcp_fastopen.c

+1 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ 
#include <net/inetpeer.h>

#include <net/tcp.h>



int sysctl_tcp_fastopen __read_mostly;

int sysctl_tcp_fastopen __read_mostly = TFO_CLIENT_ENABLE;



struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;