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Commit bcf3e33e authored by Daniel Jurgens's avatar Daniel Jurgens Committed by Greg Kroah-Hartman
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net/mlx4_en: Fix endianness bug in IPV6 csum calculation 



[ Upstream commit 82d69203df634b4dfa765c94f60ce9482bcc44d6 ]

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: f8c6455b ('net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE')
Signed-off-by: default avatarDaniel Jurgens <danielj@mellanox.com>
Reviewed-by: default avatarCarol Soto <clsoto@us.ibm.com>
Tested-by: default avatarCarol Soto <clsoto@us.ibm.com>
Signed-off-by: default avatarTariq Toukan <tariqt@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e0c03136

drivers/net/ethernet/mellanox/mlx4/en_rx.c

+1 −1
Original line number Diff line number Diff line
@@ -704,7 +704,7 @@ 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);