From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 26 May 2009 18:50:24 +0000 (+0000)
Subject: tcp: Optimise GRO port comparisons
X-Git-Tag: v2.6.31-rc1~330^2~256
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=745898eaf0eb7a04a56dec1188d9148259510863;p=~shefty%2Frdma-dev.git

tcp: Optimise GRO port comparisons

Instead of doing two 16-bit operations for the source/destination
ports, we can do one 32-bit operation to take care both.

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

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7a0f0b27bf1..ff6adecc54c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2544,7 +2544,7 @@ struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 
 		th2 = tcp_hdr(p);
 
-		if ((th->source ^ th2->source) | (th->dest ^ th2->dest)) {
+		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
 			NAPI_GRO_CB(p)->same_flow = 0;
 			continue;
 		}