netdev - Re: [RFC PATCH net-next 3/3] net: dsa: listen for SWITCHDEV_{FDB,DEL}_ADD_TO

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Message-ID: <20201109123813.kjzvel7pszhcmcgw@skbuf>
Date:   Mon, 9 Nov 2020 14:38:13 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     Andrew Lunn <andrew@...n.ch>, DENG Qingfang <dqfext@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Marek Behun <marek.behun@....cz>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Subject: Re: [RFC PATCH net-next 3/3] net: dsa: listen for
 SWITCHDEV_{FDB,DEL}_ADD_TO_DEVICE on foreign bridge neighbors

On Mon, Nov 09, 2020 at 02:31:11PM +0200, Vladimir Oltean wrote:
> I need to sit on this for a while. How many DSA drivers do we have that
> don't do SA learning in hardware for CPU-injected packets? ocelot/felix
> and mv88e6xxx? Who else? Because if there aren't that many (or any at
> all except for these two), then I could try to spend some time and see
> how Felix behaves when I send FORWARD frames to it. Then we could go on
> full blast with the other alternative, to force-enable address learning
> from the CPU port, and declare this one as too complicated and not worth
> the effort.

In fact I'm not sure that I should be expecting an answer to this
question. We can evaluate the other alternative in parallel. Would you
be so kind to send some sort of RFC for your TX-side offload_fwd_mark so
that I could test with the hardware I have, and get a better understanding
of the limitations there?