netdev - Re: [PATCH v2 net-next 2/6] net: dsa: propagate flags down towards drivers

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Date:   Tue, 28 Mar 2023 01:59:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Hans Schultz <netdev@...io-technology.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "maintainer:MICROCHIP KSZ SERIES ETHERNET SWITCH DRIVER" 
        <UNGLinuxDriver@...rochip.com>, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        Ido Schimmel <idosch@...dia.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:RENESAS RZ/N1 A5PSW SWITCH DRIVER" 
        <linux-renesas-soc@...r.kernel.org>,
        "moderated list:ETHERNET BRIDGE" <bridge@...ts.linux-foundation.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 2/6] net: dsa: propagate flags down towards
 drivers

On Mon, Mar 27, 2023 at 11:49:58PM +0200, Hans Schultz wrote:
> My first approach was to use the SWITCHDEV_FDB_ADD_TO_BRIDGE event
> and not the SWITCHDEV_FDB_OFFLOADED event as the first would set the
> external learned flag which is not aged out by the bridge.

Link to patch? I don't see any SWITCHDEV_FDB_ADD_TO_BRIDGE call in
either the v1:
https://lore.kernel.org/netdev/20230130173429.3577450-6-netdev@kapio-technology.com/
or the RFC:
https://lore.kernel.org/netdev/20230117185714.3058453-6-netdev@kapio-technology.com/
and the change log does not mention it either.

> I have at some point earlier asked why there would be two quite
> equivalent flags and what the difference between them are, but I didn't
> get a response.

Actually, the part which you are now posing as a question (what is the
difference?) was part of the premise of your earlier question (there is
no difference => why do we have both?).
https://lore.kernel.org/netdev/d972e76bed896b229d9df4da81ad8eb4@kapio-technology.com/

I believe that no one answered because the question was confused and it
wasn't really clear what you were asking.

> 
> Now I see the difference and that I cannot use the offloaded flag
> without changing the behaviour of the system as I actually change the
> behaviour of the offloaded flag in this version of the patch-set.
> 
> So if the idea of a 'synthetically' learned fdb entry from the driver
> using the SWITCHDEV_FDB_ADD_TO_BRIDGE event from the driver towards the
> bridge instead is accepted, I can go with that?
> (thus removing all the changes in the patch-set regarding the offloaded
> flag ofcourse)

which idea is that, again?