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

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Message-Id: <C6YQXZUI5RGL.2QLVGE7F8QC5I@wkz-x280>
Date:   Mon, 09 Nov 2020 13:54:08 +0100
From:   "Tobias Waldekranz" <tobias@...dekranz.com>
To:     "Vladimir Oltean" <olteanv@...il.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 9, 2020 at 3:38 PM CET, Vladimir Oltean wrote:
> 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?

That is the plan. I have some stuff I need to get done before
though. The current implementation is on a 4.19 kernel, so it's going
to take some time to rebase it.