netdev - [PATCH net-next] flow_dissector: support L2 GRE

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Date:	Mon, 11 Mar 2013 17:52:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Michael Dalton <mwdalton@...gle.com>
Subject: [PATCH net-next] flow_dissector: support L2 GRE

From: Michael Dalton <mwdalton@...gle.com>

Add support for L2 GRE tunnels, so that RPS can be more effective.

Signed-off-by: Michael Dalton <mwdalton@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/flow_dissector.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 9d4c720..f8d9e03 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -119,6 +119,17 @@ ipv6:
 				nhoff += 4;
 			if (hdr->flags & GRE_SEQ)
 				nhoff += 4;
+			if (proto == htons(ETH_P_TEB)) {
+				const struct ethhdr *eth;
+				struct ethhdr _eth;
+
+				eth = skb_header_pointer(skb, nhoff,
+							 sizeof(_eth), &_eth);
+				if (!eth)
+					return false;
+				proto = eth->h_proto;
+				nhoff += sizeof(*eth);
+			}
 			goto again;
 		}
 		break;


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