linux-kernel - [PATCH 3.10 32/56] net: mvneta: Fix big endian issue in mvneta_txq_desc

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Date:	Sat, 26 Jul 2014 12:02:25 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Thomas Fitzsimmons <fitzsim@...zsim.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.10 32/56] net: mvneta: Fix big endian issue in mvneta_txq_desc_csum()

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Thomas Fitzsimmons <fitzsim@...zsim.org>

[ Upstream commit 0a1985879437d14bda8c90d0dae3455c467d7642 ]

This commit fixes the command value generated for CSUM calculation
when running in big endian mode.  The Ethernet protocol ID for IP was
being unconditionally byte-swapped in the layer 3 protocol check (with
swab16), which caused the mvneta driver to not function correctly in
big endian mode.  This patch byte-swaps the ID conditionally with
htons.

Cc: <stable@...r.kernel.org> # v3.13+
Signed-off-by: Thomas Fitzsimmons <fitzsim@...zsim.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/marvell/mvneta.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1145,7 +1145,7 @@ static u32 mvneta_txq_desc_csum(int l3_o
 	command =  l3_offs    << MVNETA_TX_L3_OFF_SHIFT;
 	command |= ip_hdr_len << MVNETA_TX_IP_HLEN_SHIFT;
 
-	if (l3_proto == swab16(ETH_P_IP))
+	if (l3_proto == htons(ETH_P_IP))
 		command |= MVNETA_TXD_IP_CSUM;
 	else
 		command |= MVNETA_TX_L3_IP6;


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