netdev - sit: Set SKB_GSO_SIT bit when performing GRO

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Message-ID: <20150716002350.GA7529@gondor.apana.org.au>
Date:	Thu, 16 Jul 2015 08:23:50 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Wolfgang Walter <linux@...m.de>
Cc:	netdev@...r.kernel.org, Tom Herbert <therbert@...gle.com>
Subject: sit: Set SKB_GSO_SIT bit when performing GRO

On Wed, Jul 15, 2015 at 02:25:59PM +0200, Wolfgang Walter wrote:
>
> Yes. Switching TSO off and leaving GRO on works, too.

OK, could you please try this patch?

---8<---
We need to set the SKB_GSO_SIT bit if we detect a 6-in-4 tunnel
when doing GRO.  Otherwise we may throw a packet at TSO hardware
that doesn't know what to do with it.

Fixes: 19424e052fb4 ("sit: Add gro callbacks to sit_offload")
Reported-by: Wolfgang Walter <linux@...m.de>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index e893cd1..1252eac 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -289,11 +289,21 @@ static struct packet_offload ipv6_packet_offload __read_mostly = {
 	},
 };
 
+static int sit_gro_complete(struct sk_buff *skb, int nhoff)
+{
+	int err = ipv6_gro_complete(skb, nhoff);
+
+	skb->encapsulation = 1;
+	skb_shinfo(skb)->gso_type |= SKB_GSO_SIT;
+
+	return err;
+}
+
 static const struct net_offload sit_offload = {
 	.callbacks = {
 		.gso_segment	= ipv6_gso_segment,
 		.gro_receive	= ipv6_gro_receive,
-		.gro_complete	= ipv6_gro_complete,
+		.gro_complete	= sit_gro_complete,
 	},
 };
 
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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