netdev - [PATCH net-next 1/3] gro: Pull headers into skb head for 1st skb in gro list

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Message-ID: <1435871054-635096-2-git-send-email-tom@herbertland.com>
Date:	Thu, 2 Jul 2015 14:04:12 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 1/3] gro: Pull headers into skb head for 1st skb in gro list

When setting up the first skb in a gro list we ensure that all the
headers up to skb_gro_offset have been pulled into head. In subsequent
uses of this skb (e.g. determining same_flow) it is assumed that the
headers can be accessed in the skb head.

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 net/core/dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 6778a99..05e0e37 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4228,6 +4228,10 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 	} else {
 		napi->gro_count++;
 	}
+
+	/* Ensure all headers are pulled into head for 1st skb */
+	skb_gro_header_slow(skb, skb_gro_offset(skb), 0);
+
 	NAPI_GRO_CB(skb)->count = 1;
 	NAPI_GRO_CB(skb)->age = jiffies;
 	NAPI_GRO_CB(skb)->last = skb;
-- 
1.8.1

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