linux-kernel - Re: [PATCH v3 net-next 5/7] net: dsa: exit early in dsa_slave_switchdev

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Message-ID: <20201216153954.GD2901580@lunn.ch>
Date:   Wed, 16 Dec 2020 16:39:54 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Marek Behun <marek.behun@....cz>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Claudiu Manoil <claudiu.manoil@....com>,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v3 net-next 5/7] net: dsa: exit early in
 dsa_slave_switchdev_event if we can't program the FDB

On Sun, Dec 13, 2020 at 04:07:08PM +0200, Vladimir Oltean wrote:
> Right now, the following would happen for a switch driver that does not
> implement .port_fdb_add or .port_fdb_del.
> 
> dsa_slave_switchdev_event returns NOTIFY_OK and schedules:
> -> dsa_slave_switchdev_event_work
>    -> dsa_port_fdb_add
>       -> dsa_port_notify(DSA_NOTIFIER_FDB_ADD)
>          -> dsa_switch_fdb_add
>             -> if (!ds->ops->port_fdb_add) return -EOPNOTSUPP;
>    -> an error is printed with dev_dbg, and
>       dsa_fdb_offload_notify(switchdev_work) is not called.
> 
> We can avoid scheduling the worker for nothing and say NOTIFY_DONE.
> Because we don't call dsa_fdb_offload_notify, the static FDB entry will
> remain just in the software bridge.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew