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

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Date:   Tue, 8 Nov 2022 13:23:05 +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 11:56:52AM +0100, Felix Fietkau wrote:
> On 08.11.22 11:52, Vladimir Oltean wrote:
> > On Tue, Nov 08, 2022 at 11:42:09AM +0100, Felix Fietkau wrote:
> > > Okay, I will stick with METADATA_HW_PORT_MUX for now. If we use it in the
> > > flow dissector to avoid the tagger specific fixup, we might as well use it
> > > in DSA to skip the tag proto receive call. What do you think?
> > 
> > I suppose that dsa_switch_rcv() could test for the presence of a metadata_dst
> > and treat that generically if present, without unnecessarily calling down into
> > the tagging protocol ->rcv() call. The assumption being that the metadata_dst
> > is always formatted (by the DSA master) in a vendor-agnostic way.
> 
> Right. The assumption is that if we use METADATA_HW_PORT_MUX, the field
> md_dst->u.port_info.port_id will contain the index of the DSA port.

Yes. Please coordinate with Maxime, see if it's possible to do something
similar (generic) on TX, depending on whether the DSA master reports it
can interpret metadata_dst as offloaded DSA tags. You didn't copy too
many folks to this patch set, so others might have missed it.