netdev - [PATCH] r8169: fix checksum broken

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Message-ID: <4CDD13BD.7060109@cn.fujitsu.com>
Date:	Fri, 12 Nov 2010 18:15:25 +0800
From:	Shan Wei <shanwei@...fujitsu.com>
To:	romieu@...zoreil.com
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: [PATCH] r8169: fix checksum broken  

If r8196 received packets with invalid sctp/igmp(not tcp, udp) checksum, r8196 set skb->ip_summed
wit CHECKSUM_UNNECESSARY. This cause that upper protocol don't check checksum field.

I am not family with r8196 driver. I try to guess the meaning of RxProtoIP and IPFail.
RxProtoIP stands for received IPv4 packet that upper protocol is not tcp and udp. 
!(opts1 & IPFail) is true means that driver correctly to check checksum in IPv4 header.

If it's right, I think we should not set ip_summed wit CHECKSUM_UNNECESSARY for my sctp packets
with invalid checksum. 

If it's not right, please tell me. 

Signed-off-by: Shan Wei <shanwei@...fujitsu.com>
---
 drivers/net/r8169.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index d88ce9f..2cf6c2e 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -4440,8 +4440,7 @@ static inline void rtl8169_rx_csum(struct sk_buff *skb, u32 opts1)
 	u32 status = opts1 & RxProtoMask;

 	if (((status == RxProtoTCP) && !(opts1 & TCPFail)) ||
-	    ((status == RxProtoUDP) && !(opts1 & UDPFail)) ||
-	    ((status == RxProtoIP) && !(opts1 & IPFail)))
+	    ((status == RxProtoUDP) && !(opts1 & UDPFail)))
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 	else
 		skb_checksum_none_assert(skb);
-- 
1.6.3.3

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