linux-kernel - [041/145] net: bug fix for vlan + gro issue

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Message-Id: <20100313002708.825421266@kvm.kroah.org>
Date:	Fri, 12 Mar 2010 16:26:14 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Patrick McHardy <kaber@...sh.net>,
	Ajit Khaparde <ajitk@...verengines.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [041/145] net: bug fix for vlan + gro issue

2.6.32-stable review patch.  If anyone has any objections, please let me know.

----------------
From: Ajit Khaparde <ajitk@...verengines.com>

[ Upstream commit e76b69cc0133952c98aa1ad6330cacacd269fd64 ]

Traffic (tcp) doesnot start on a vlan interface when gro is enabled.
Even the tcp handshake was not taking place.
This is because, the eth_type_trans call before the netif_receive_skb
in napi_gro_finish() resets the skb->dev to napi->dev from the previously
set vlan netdev interface. This causes the ip_route_input to drop the
incoming packet considering it as a packet coming from a martian source.

I could repro this on 2.6.32.7 (stable) and 2.6.33-rc7.
With this fix, the traffic starts and the test runs fine on both vlan
and non-vlan interfaces.

CC: Herbert Xu <herbert@...dor.apana.org.au>
CC: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Ajit Khaparde <ajitk@...verengines.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/core/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2630,7 +2630,7 @@ int napi_frags_finish(struct napi_struct
 	switch (ret) {
 	case GRO_NORMAL:
 	case GRO_HELD:
-		skb->protocol = eth_type_trans(skb, napi->dev);
+		skb->protocol = eth_type_trans(skb, skb->dev);

 		if (ret == GRO_NORMAL)
 			return netif_receive_skb(skb);

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