linux-kernel - [PATCH] [84/223] net: NETIF_F_HW_CSUM does not imply FCoE CRC offload

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Message-Id: <20101212234623.93332B27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:46:23 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	bhutchings@...arflare.com, davem@...emloft.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [84/223] net: NETIF_F_HW_CSUM does not imply FCoE CRC offload

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Ben Hutchings <bhutchings@...arflare.com>

commit 66c68bcc489fadd4f5e8839e966e3a366e50d1d5 upstream.

NETIF_F_HW_CSUM indicates the ability to update an TCP/IP-style 16-bit
checksum with the checksum of an arbitrary part of the packet data,
whereas the FCoE CRC is something entirely different.

Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/core/dev.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux/net/core/dev.c
===================================================================
--- linux.orig/net/core/dev.c
+++ linux/net/core/dev.c
@@ -1653,10 +1653,10 @@ EXPORT_SYMBOL(netif_device_attach);
 
 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
 {
-	return ((features & NETIF_F_GEN_CSUM) ||
-		((features & NETIF_F_IP_CSUM) &&
+	return ((features & NETIF_F_NO_CSUM) ||
+		((features & NETIF_F_V4_CSUM) &&
 		 protocol == htons(ETH_P_IP)) ||
-		((features & NETIF_F_IPV6_CSUM) &&
+		((features & NETIF_F_V6_CSUM) &&
 		 protocol == htons(ETH_P_IPV6)) ||
 		((features & NETIF_F_FCOE_CRC) &&
 		 protocol == htons(ETH_P_FCOE)));
--
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