linux-kernel - RE: [PATCH 3.19.y-ckt 21/40] net/mlx4_en: Fix endianness bug in IPV6 csum calculation

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Date:	Thu, 26 May 2016 08:18:24 +0000
From:	Tariq Toukan <tariqt@...lanox.com>
To:	Kamal Mostafa <kamal@...onical.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"kernel-team@...ts.ubuntu.com" <kernel-team@...ts.ubuntu.com>
CC:	Daniel Jurgens <danielj@...lanox.com>,
	"David S . Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eran Ben Elisha <eranbe@...lanox.com>
Subject: RE: [PATCH 3.19.y-ckt 21/40] net/mlx4_en: Fix endianness bug in IPV6
 csum calculation

Hi Kamal,
It's just a nit, but we would like to keep the patches in the same form as in upstream when possible, i.e. without the line-break here.

Thanks,
Tariq Toukan

-----Original Message-----
From: Kamal Mostafa [mailto:kamal@...onical.com] 
Sent: Wednesday, May 25, 2016 8:30 PM
To: linux-kernel@...r.kernel.org; stable@...r.kernel.org; kernel-team@...ts.ubuntu.com
Cc: Daniel Jurgens <danielj@...lanox.com>; Tariq Toukan <tariqt@...lanox.com>; David S . Miller <davem@...emloft.net>; Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 21/40] net/mlx4_en: Fix endianness bug in IPV6 csum calculation

3.19.8-ckt22 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Daniel Jurgens <danielj@...lanox.com>

commit 82d69203df634b4dfa765c94f60ce9482bcc44d6 upstream.

Use htons instead of unconditionally byte swapping nexthdr.  On a little endian systems shifting the byte is correct behavior, but it results in incorrect csums on big endian architectures.

Fixes: f8c6455bb04b ('net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE')
Signed-off-by: Daniel Jurgens <danielj@...lanox.com>
Reviewed-by: Carol Soto <clsoto@...ibm.com>
Tested-by: Carol Soto <clsoto@...ibm.com>
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 37cdc34..1c2790b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -706,7 +706,7 @@ static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
 
 	if (ipv6h->nexthdr == IPPROTO_FRAGMENT || ipv6h->nexthdr == IPPROTO_HOPOPTS)
 		return -1;
-	hw_checksum = csum_add(hw_checksum, (__force __wsum)(ipv6h->nexthdr << 8));
+	hw_checksum = csum_add(hw_checksum, (__force 
+__wsum)htons(ipv6h->nexthdr));
 
 	csum_pseudo_hdr = csum_partial(&ipv6h->saddr,
 				       sizeof(ipv6h->saddr) + sizeof(ipv6h->daddr), 0);
--
2.7.4