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net/mlx5e: Fix features check of IPv6 traffic

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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>
This commit is contained in:
Gal Pressman 2017-11-21 17:49:36 +02:00 committed by Saeed Mahameed
parent ff0891915c
commit 2989ad1ec0
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -3678,6 +3678,7 @@ static netdev_features_t mlx5e_tunnel_features_check(struct mlx5e_priv *priv,
struct sk_buff *skb,
netdev_features_t features)
{
unsigned int offset = 0;
struct udphdr *udph;
u8 proto;
u16 port;
@ -3687,7 +3688,7 @@ static netdev_features_t mlx5e_tunnel_features_check(struct mlx5e_priv *priv,
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;