commit 35f3625c21852ad839f20c91c7d81c4c1101e207
author Maxime Chevallier <maxime.chevallier@bootlin.com> Fri Oct 05 09:04:40 2018 +0200
committer David S. Miller <davem@davemloft.net> Fri Oct 05 14:52:43 2018 -0700
tree b6e41c36935045703f589f169f1f6a3554adc272
parent a688caa34beb2fd2a92f1b6d33e40cde433ba160

net: mvpp2: Extract the correct ethtype from the skb for tx csum offload

When offloading the L3 and L4 csum computation on TX, we need to extract
the l3_proto from the ethtype, independently of the presence of a vlan
tag.

The actual driver uses skb->protocol as-is, resulting in packets with
the wrong L4 checksum being sent when there's a vlan tag in the packet
header and checksum offloading is enabled.

This commit makes use of vlan_protocol_get() to get the correct ethtype
regardless the presence of a vlan tag.

Fixes: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>