linux-kernel - [067/114] net: Fix napi_gro

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Message-Id: <20100824224507.063154747@clark.site>
Date:	Tue, 24 Aug 2010 15:45:12 -0700
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,
	Jarek Poplawski <jarkao2@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Subject: [067/114] net: Fix napi_gro_frags vs netpoll path

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Jarek Poplawski <jarkao2@...il.com>

[ Upstream commit ce9e76c8450fc248d3e1fc16ef05e6eb50c02fa5 ]

The netpoll_rx_on() check in __napi_gro_receive() skips part of the
"common" GRO_NORMAL path, especially "pull:" in dev_gro_receive(),
where at least eth header should be copied for entirely paged skbs.

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
Acked-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 |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3064,7 +3064,7 @@ enum gro_result dev_gro_receive(struct n
 	int mac_len;
 	enum gro_result ret;
 
-	if (!(skb->dev->features & NETIF_F_GRO))
+	if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
 		goto normal;
 
 	if (skb_is_gso(skb) || skb_has_frags(skb))
@@ -3151,9 +3151,6 @@ __napi_gro_receive(struct napi_struct *n
 {
 	struct sk_buff *p;
 
-	if (netpoll_rx_on(skb))
-		return GRO_NORMAL;
-
 	for (p = napi->gro_list; p; p = p->next) {
 		NAPI_GRO_CB(p)->same_flow =
 			(p->dev == skb->dev) &&


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