netdev - [PATCH V2 net 2/3] be2net: Fix offload features for Q-in-Q packets

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Message-Id: <1495558392-1238-3-git-send-email-vyasevic@redhat.com>
Date:   Tue, 23 May 2017 12:53:11 -0400
From:   Vladislav Yasevich <vyasevich@...il.com>
To:     netdev@...r.kernel.org
Cc:     alexander.duyck@...il.com, makita.toshiaki@....ntt.co.jp,
        Vladislav Yasevich <vyasevic@...hat.com>,
        Sathya Perla <sathya.perla@...adcom.com>,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH V2 net 2/3] be2net: Fix offload features for Q-in-Q packets

At least some of the be2net cards do not seem to be capabled
of performing checksum offload computions on Q-in-Q packets.
In these case, the recevied checksum on the remote is invalid
and TCP syn packets are dropped.

This patch adds a call to check disbled acceleration features
on Q-in-Q tagged traffic.

CC: Sathya Perla <sathya.perla@...adcom.com>
CC: Ajit Khaparde <ajit.khaparde@...adcom.com
CC: Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>
CC: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
---
 drivers/net/ethernet/emulex/benet/be_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index f3a09ab..4eee18c 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -5078,9 +5078,11 @@ static netdev_features_t be_features_check(struct sk_buff *skb,
 	struct be_adapter *adapter = netdev_priv(dev);
 	u8 l4_hdr = 0;
 
-	/* The code below restricts offload features for some tunneled packets.
+	/* The code below restricts offload features for some tunneled and
+	 * Q-in-Q packets.
 	 * Offload features for normal (non tunnel) packets are unchanged.
 	 */
+	features = vlan_features_check(skb, features);
 	if (!skb->encapsulation ||
 	    !(adapter->flags & BE_FLAGS_VXLAN_OFFLOADS))
 		return features;
-- 
2.7.4