netdev - Re: [PATCH v2 net-next 0/5] Make SWITCHDEV_FDB_{ADD,DEL}_TO

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Date:   Fri, 20 Aug 2021 13:49:48 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vadym Kochan <vkochan@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        UNGLinuxDriver@...rochip.com,
        Grygorii Strashko <grygorii.strashko@...com>,
        Marek Behun <kabel@...ckhole.sk>,
        DENG Qingfang <dqfext@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        George McCollister <george.mccollister@...il.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Ivan Vecera <ivecera@...hat.com>,
        Vlad Buslov <vladbu@...dia.com>,
        Jianbo Liu <jianbol@...dia.com>,
        Mark Bloch <mbloch@...dia.com>, Roi Dayan <roid@...dia.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH v2 net-next 0/5] Make SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE
 blocking

On Fri, Aug 20, 2021 at 12:16:10PM +0300, Ido Schimmel wrote:
> On Thu, Aug 19, 2021 at 07:07:18PM +0300, Vladimir Oltean wrote:
> > Problem statement:
> >
> > Any time a driver needs to create a private association between a bridge
> > upper interface and use that association within its
> > SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE handler, we have an issue with FDB
> > entries deleted by the bridge when the port leaves. The issue is that
> > all switchdev drivers schedule a work item to have sleepable context,
> > and that work item can be actually scheduled after the port has left the
> > bridge, which means the association might have already been broken by
> > the time the scheduled FDB work item attempts to use it.
>
> This is handled in mlxsw by telling the device to flush the FDB entries
> pointing to the {port, FID} when the VLAN is deleted (synchronously).

If you have FDB entries pointing to bridge ports that are foreign
interfaces and you offload them, do you catch the VLAN deletion on the
foreign port and flush your entries towards it at that time?