netdev - Re: [PATCH net-next 0/2] bridge: FDB: Notify about removal of non-user-added entries

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Message-ID: <20180501175439.GB1265@lunn.ch>
Date:   Tue, 1 May 2018 19:54:39 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Petr Machata <petrm@...lanox.com>
Cc:     netdev@...r.kernel.org, ivecera@...hat.com, davem@...emloft.net,
        stephen@...workplumber.org, vivien.didelot@...oirfairelinux.com,
        f.fainelli@...il.com, jiri@...nulli.us
Subject: Re: [PATCH net-next 0/2] bridge: FDB: Notify about removal of
 non-user-added entries

On Tue, May 01, 2018 at 07:04:19PM +0200, Petr Machata wrote:
> Device drivers may generally need to keep in sync with bridge's FDB. In
> particular, for its offload of tc mirror action where the mirrored-to
> device is a gretap device, mlxsw needs to listen to a number of events.
> SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE would be a natural notification to
> listen to in order to keep up with FDB updates.
> 
> However, for removal of FDB entries added due to device activity (as
> opposed to explicit addition through "bridge fdb add" or similar), there
> are no notifications.

Hi Petr

Could you explain this some more. Why is mlxsw special in that it
needs this, but other drivers don't. The b53 driver supports tc
mirror, for example.

    Andrew