Patch "net/mlx5e: Fix features check of IPv6 traffic" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    net/mlx5e: Fix features check of IPv6 traffic

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-mlx5e-fix-features-check-of-ipv6-traffic.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Sun Dec 31 11:12:48 CET 2017
From: Gal Pressman <galp@mellanox.com>
Date: Tue, 21 Nov 2017 17:49:36 +0200
Subject: net/mlx5e: Fix features check of IPv6 traffic

From: Gal Pressman <galp@mellanox.com>


[ Upstream commit 2989ad1ec03021ee6d2193c35414f1d970a243de ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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;


Patches currently in stable-queue which might be from galp@mellanox.com are

queue-4.14/net-mlx5e-fix-possible-deadlock-of-vxlan-lock.patch
queue-4.14/net-mlx5e-prevent-possible-races-in-vxlan-control-flow.patch
queue-4.14/net-mlx5e-add-refcount-to-vxlan-structure.patch
queue-4.14/net-mlx5e-fix-features-check-of-ipv6-traffic.patch