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

[Vladimir Oltean <vladimir.oltean@nxp.com>]

On Tue, Jul 20, 2021 at 05:51:24PM +0300, Ido Schimmel wrote:
> On Tue, Jul 20, 2021 at 02:46:18PM +0000, Vladimir Oltean wrote:
> > 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.
> > 
> > I mean, I could guard br_{vlan,mdb,fdb}_replay() against NULL notifier
> > block pointers, and then make mlxsw pass NULL for both the atomic_nb and
> > blocking_nb.
> > 
> > But why? How do you deal with a host-joined mdb that was auto-installed
> > while there was no port under the bridge?
> 
> mlxsw does not currently support such entries. It's on my TODO list.
> When we add support for that, we will also take care of the replay.

Okay, that I can do. I had the impression that mlxsw does - I knew for
certain that DSA isn't the only driver offloading SWITCHDEV_OBJ_ID_HOST_MDB
so I looked it up right now, and I remembered. cpsw was the other driver,
and it does a pretty funny thing: the same thing as for
SWITCHDEV_OBJ_ID_PORT_MDB.

I guess I'll just provide NULL pointers for every driver except those I
already received acks for (dpaa2-switch, ocelot) and DSA. Then driver
maintainers can take it from there as they wish. Hopefully this should
also make the patches slide in easier.