netdev - Re: [PATCH net v2] net: mvpp2: Extract the correct ethtype from the skb for tx csum offload

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Date:   Fri, 05 Oct 2018 14:53:16 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     maxime.chevallier@...tlin.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        antoine.tenart@...tlin.com, thomas.petazzoni@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, stefanc@...vell.com, ymarkman@...vell.com,
        mw@...ihalf.com
Subject: Re: [PATCH net v2] net: mvpp2: Extract the correct ethtype from
 the skb for tx csum offload

From: Maxime Chevallier <maxime.chevallier@...tlin.com>
Date: Fri,  5 Oct 2018 09:04:40 +0200

> 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@...tlin.com>
> ---
> V2: Use htons on values that can be swapped at compile-time, following
>     Yan's comment. Fix the "Fixes" tag and a typo, following Sergei's comment.

Applied and queued up for -stable.