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tcp: enable sockets to use MSG_FASTOPEN by default

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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: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2013-10-31 09:19:32 -07:00 committed by David S. Miller
parent f8785c5514
commit 0d41cca490
2 changed files with 3 additions and 3 deletions
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4
Documentation/networking/ip-sysctl.txt
View file

@ -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

2
net/ipv4/tcp_fastopen.c
View file

@ -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;