net/mlx5e: Fix loopback self test when GRO is off

[ Upstream commit ef7a3518f7dd4f4cf5e5b5358c93d1eb78df28fb ]

When GRO is off, the transport header pointer in sk_buff is
initialized to network's header.

To find the udp header, instead of using udp_hdr() which assumes
skb_network_header was set, manually calculate the udp header offset.

Fixes: 0952da791c97 ("net/mlx5e: Add support for loopback selftest")
Signed-off-by: Inbar Karmy <inbark@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
index 5a4608281f38d236d77d8f86f81f52d683f3eadc..707976482c0987c33b5183804e152309cc57d6d4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
@@ -216,7 +216,8 @@ mlx5e_test_loopback_validate(struct sk_buff *skb,
        if (iph->protocol != IPPROTO_UDP)
                goto out;
 
-       udph = udp_hdr(skb);
+       /* Don't assume skb_transport_header() was set */
+       udph = (struct udphdr *)((u8 *)iph + 4 * iph->ihl);
        if (udph->dest != htons(9))
                goto out;