diff mbox

[net] net/mlx4_en: Fix endianness bug in IPV6 csum calculation

Message ID 1462363233-8598-1-git-send-email-tariqt@mellanox.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Tariq Toukan May 4, 2016, noon UTC
From: Daniel Jurgens <danielj@mellanox.com>

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@mellanox.com>
Reviewed-by: Carol Soto <clsoto@us.ibm.com>
Tested-by: Carol Soto <clsoto@us.ibm.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

David Miller May 6, 2016, 3:27 a.m. UTC | #1
From: Tariq Toukan <tariqt@mellanox.com>
Date: Wed,  4 May 2016 15:00:33 +0300

> From: Daniel Jurgens <danielj@mellanox.com>
> 
> 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@mellanox.com>
> Reviewed-by: Carol Soto <clsoto@us.ibm.com>
> Tested-by: Carol Soto <clsoto@us.ibm.com>
> Signed-off-by: Tariq Toukan <tariqt@mellanox.com>

Applied and queued up for -stable, thanks.
diff mbox

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index b723e3b..ca3a384 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -707,7 +707,7 @@  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);