netdev - Re: [PATCH v5 net-next 00/10] Let switchdev drivers offload and unoffload bridge ports at their own convenience

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Message-ID: <20210720194717.qbdz5mmmxqbn3y3z@skbuf>
Date:   Tue, 20 Jul 2021 19:47:18 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Ido Schimmel <idosch@...sch.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Marek Behun <kabel@...ckhole.sk>,
        DENG Qingfang <dqfext@...il.com>
Subject: Re: [PATCH v5 net-next 00/10] Let switchdev drivers offload and
 unoffload bridge ports at their own convenience

On Tue, Jul 20, 2021 at 05:25:08PM +0300, Ido Schimmel wrote:
> If you don't want to change the order, then at least make the
> replay/cleanup optional and set it to 'false' for mlxsw. This should
> mean that the only change in mlxsw should be adding calls to
> switchdev_bridge_port_offload() / switchdev_bridge_port_unoffload() in
> mlxsw_sp_bridge_port_create() / mlxsw_sp_bridge_port_destroy(),
> respectively.

Is there any specific reason why you suggested me to move the
switchdev_bridge_port_offload() call from the top-level
mlxsw_sp_port_bridge_join() into mlxsw_sp_bridge_port_create()
(and similarly, from _pre_bridge_leave to _destroy)?

Even if you don't support replays right now, you'd need to move a bunch
of code around before you would get them to work. As far as I can see,
mlxsw_sp_bridge_port_create() is a bit too early and
mlxsw_sp_bridge_port_destroy() is a bit too late. The port needs to be
fairly up and running to be able to process the switchdev notifiers at
that stage.

Do you mind if I keep the hooks where they are, which is what I do for
all drivers? I don't think I am missing to handle any case.