netdev - [net 2/2] net: fix a bug of dropping FCoE frames when disabling tx ip checksum

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Date:	Wed, 14 Mar 2012 00:01:58 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Yi Zou <yi.zou@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net 2/2] net: fix a bug of dropping FCoE frames when disabling tx ip checksum

From: Yi Zou <yi.zou@...el.com>

Fix a bug when using 'ethtool -K ethx tx off' to turn off tx ip checksum,
FCoE CRC offload should not be impacte. The skb_checksum_help() is needed
only if it's not FCoE traffic for ip checksum, regardless of ethtool toggling
the tx ip checksum on or off.

Signed-off-by: Yi Zou <yi.zou@...el.com>
Tested-by: Ross Brattain <ross.b.brattain@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 net/core/dev.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 6ca32f6..9e378009 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1913,6 +1913,9 @@ int skb_checksum_help(struct sk_buff *skb)
 	__wsum csum;
 	int ret = 0, offset;
 
+	if (skb->protocol == htons(ETH_P_FCOE))
+		goto out;
+
 	if (skb->ip_summed == CHECKSUM_COMPLETE)
 		goto out_set_summed;
 
-- 
1.7.7.6

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