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

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Date:   Thu, 4 Oct 2018 12:50:17 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Antoine Tenart <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] net: mvpp2: Extract the correct ethtype from the skb
 for tx csum offload

Hello!

On 10/4/2018 11:03 AM, Maxime Chevallier wrote:

> 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.
             ^ of?

> Fixes: 3f51850 ("ethernet: Add new driver for Marvell Armada 375 network unit")

     12 hex digits needed here.

> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>

[...]

MBR, Sergei