netdev - Re: [PATCH 08/14] net: vlan: remove invalid VLAN protocol warning

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Date:   Tue, 8 Nov 2022 11:40:18 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Felix Fietkau <nbd@....name>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/14] net: vlan: remove invalid VLAN protocol warning

On Tue, Nov 08, 2022 at 10:20:44AM +0100, Felix Fietkau wrote:
> I need to look into how METADATA_HW_PORT_MUX works, but I think it could
> work.

Could you please coordinate with Maxime to come up with something
common? Currently he proposes a generic "oob" tagger, while you propose
that we stay with the "mtk"/"qca" taggers, but they are taught to look
after offloaded metadata rather than in the packet. IMO your proposal
sounds better; the name of the tagging protocol is already exposed to
user space via /sys/class/net/<dsa-master>/dsa/tagging and therefore ABI.
It's just that we need a way to figure out how to make the flow
dissector and other layers not adjust for DSA header length if the DSA
tag is offloaded and not present in the packet.