From: Gal Pressman <galp@mellanox.com>
Date: Tue, 21 Nov 2017 17:49:36 +0200
Subject: net/mlx5e: Fix features check of IPv6 traffic
Patch-mainline: v4.15-rc5
Git-commit: 2989ad1ec03021ee6d2193c35414f1d970a243de
References: bsc#1046305 FATE#322943
The assumption that the next header field contains the transport
protocol is wrong for IPv6 packets with extension headers.
Instead, we should look the inner-most next header field in the buffer.
This will fix TSO offload for tunnels over IPv6 with extension headers.
Performance testing: 19.25x improvement, cool!
Measuring bandwidth of 16 threads TCP traffic over IPv6 GRE tap.
CPU: Intel(R) Xeon(R) CPU E5-2660 v2 @ 2.20GHz
NIC: Mellanox Technologies MT28800 Family [ConnectX-5 Ex]
TSO: Enabled
Before: 4,926.24 Mbps
Now : 94,827.91 Mbps
Fixes: b3f63c3d5e2c ("net/mlx5e: Add netdev support for VXLAN tunneling")
Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3554,6 +3554,7 @@ static netdev_features_t mlx5e_tunnel_fe
struct sk_buff *skb,
netdev_features_t features)
{
+ unsigned int offset = 0;
struct udphdr *udph;
u8 proto;
u16 port;
@@ -3563,7 +3564,7 @@ static netdev_features_t mlx5e_tunnel_fe
proto = ip_hdr(skb)->protocol;
break;
case htons(ETH_P_IPV6):
- proto = ipv6_hdr(skb)->nexthdr;
+ proto = ipv6_find_hdr(skb, &offset, -1, NULL, NULL);
break;
default:
goto out;