tcp: do not enqueue skb with SYN flag
authorEric Dumazet <edumazet@google.com>
Tue, 2 Feb 2016 05:03:08 +0000 (21:03 -0800)
committerDavid S. Miller <davem@davemloft.net>
Sat, 6 Feb 2016 08:11:59 +0000 (03:11 -0500)
commit9d691539eea2d977e3eb86766c389a19a9c13146
tree21f14703c42c81bc67063ab7fd9fe0cdda86265b
parent61d2bcae99f66a640b3dd9632180209143fb5512
tcp: do not enqueue skb with SYN flag

If we remove the SYN flag from the skbs that tcp_fastopen_add_skb()
places in socket receive queue, then we can remove the test that
tcp_recvmsg() has to perform in fast path.

All we have to do is to adjust SEQ in the slow path.

For the moment, we place an unlikely() and output a message
if we find an skb having SYN flag set.
Goal would be to get rid of the test completely.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp.c
net/ipv4/tcp_fastopen.c