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

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Date:   Thu, 30 Mar 2023 18:44:31 +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 Thu, Mar 30, 2023 at 05:34:44PM +0200, Hans Schultz wrote:
> On Thu, Mar 30, 2023 at 18:07, Vladimir Oltean <olteanv@...il.com> wrote:
> >
> > Then, make DSA decide whether to handle the "added_by_user && !is_static"
> > combination or not, based on the presence of the DSA_FDB_FLAG_DYNAMIC
> > flag, which will be set in ds->supported_fdb_flags only for the mv88e6xxx
> > driver.
> 
> Okay, so this will require a new function in the DSA layer that sets
> which flags are supported and that the driver will call on
> initialization.
> 
> Where (in the DSA layer) should such a function be placed and what
> should it be called?

Don't overthink it, no new function. It's okay to just set
ds->supported_fdb_flags = DSA_FDB_FLAG_DYNAMIC in
mv88e6xxx_register_switch(), near the place where it currently sets
ds->num_lag_ids. Either before dsa_register_switch(), or within the
ds->ops->setup(). Both are fine, since the user network interfaces
haven't been allocated just yet by dsa_slave_create() and so, the
switchdev code path is inaccessible.

Existing drivers will have ds->supported_fdb_flags = 0 by default, since
they allocate the struct dsa_switch with kzalloc(), and DSA will have to
do something sane with that.