tcp: Add GRO support

This patch adds the TCP-specific portion of GRO.  The criterion for
merging is extremely strict (the TCP header must match exactly apart
from the checksum) so as to allow refragmentation.  Otherwise this
is pretty much identical to LRO, except that we support the merging
of ECN packets.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index a85595307fa7..664ff0ee1c83 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1410,6 +1410,8 @@ static struct net_protocol tcp_protocol = {
         .err_handler =  tcp_v4_err,
         .gso_send_check = tcp_v4_gso_send_check,
         .gso_segment =  tcp_tso_segment,
+        .gro_receive =  tcp4_gro_receive,
+        .gro_complete = tcp4_gro_complete,
         .no_policy =    1,
         .netns_ok =     1,
 };