netdev - [PATCH 2/8] net: rps: skip fragment when computing rxhash

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Date:	Wed, 18 Aug 2010 13:01:38 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Changli Gao <xiaosuo@...il.com>
Subject: [PATCH 2/8] net: rps: skip fragment when computing rxhash

Fragmented IP packets may have no transfer header, so when computing
rxhash, we should skip them.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 net/core/dev.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 3f82781..b7c5309 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2284,7 +2284,10 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
 			goto done;

 		ip = (struct iphdr *) skb->data + nhoff;
-		ip_proto = ip->protocol;
+		if (ip->frag_off & htons(IP_MF|IP_OFFSET))
+			ip_proto = 0;
+		else
+			ip_proto = ip->protocol;
 		addr1 = (__force u32) ip->saddr;
 		addr2 = (__force u32) ip->daddr;
 		ihl = ip->ihl;
--
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