netdev - Re: [PATCH v2 net-next 1/8] net: dsa: felix: program host FDB entries towards PGID_CPU for tag

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Date:   Wed, 11 May 2022 10:57:42 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Marek Behún <kabel@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>
Subject: Re: [PATCH v2 net-next 1/8] net: dsa: felix: program host FDB entries
 towards PGID_CPU for tag_8021q too

On Wed, May 11, 2022 at 12:50:13PM +0300, Vladimir Oltean wrote:
> I remembered why we had the host FDB migration procedure in place.
> 
> It is true that host FDB entry migration can be done by changing the
> value of PGID_CPU, but the problem is that only host FDB entries learned
> while operating in NPI mode go to PGID_CPU. When the CPU port operates
> in tag_8021q mode, the FDB entries are learned towards the unicast PGID
> equal to the physical port number of this CPU port, bypassing the
> PGID_CPU indirection.
> 
> So host FDB entries learned in tag_8021q mode are not migrated any
> longer towards the NPI port.
> 
> Fix this by extracting the NPI port -> PGID_CPU redirection from the
> ocelot switch lib, moving it to the Felix DSA driver, and applying it
> for any CPU port regardless of its kind (NPI or tag_8021q).
> 
> Fixes: 51349ba7f2f0 ("net: dsa: felix: stop migrating FDBs back and forth on tag proto change")

The correct tag should be:

Fixes: a51c1c3f3218 ("net: dsa: felix: stop migrating FDBs back and forth on tag proto change")

I think I wrote the bug fix before the buggy patch was merged, or before
rebasing :D