netdev - Re: [PATCH net-next v2 3/7] rocker: rocker

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Message-ID: <20180529144458.GA27555@apalos>
Date:   Tue, 29 May 2018 17:44:58 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Petr Machata <petrm@...lanox.com>
Cc:     netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        bridge@...ts.linux-foundation.org, jiri@...lanox.com,
        idosch@...lanox.com, davem@...emloft.net,
        razvan.stefanescu@....com, gregkh@...uxfoundation.org,
        stephen@...workplumber.org, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        nikolay@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 3/7] rocker: rocker_main: Ignore bridge VLAN
 events

On Tue, May 29, 2018 at 05:37:30PM +0300, Petr Machata wrote:
> Ilias Apalodimas <ilias.apalodimas@...aro.org> writes:
> 
> >> diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
> >> index e73e4fe..aeafdb9 100644
> >> --- a/drivers/net/ethernet/rocker/rocker_main.c
> >> +++ b/drivers/net/ethernet/rocker/rocker_main.c
> >> @@ -1632,6 +1632,9 @@ rocker_world_port_obj_vlan_add(struct rocker_port *rocker_port,
> >>  {
> >>  	struct rocker_world_ops *wops = rocker_port->rocker->wops;
> >>  
> >> +	if (netif_is_bridge_master(vlan->obj.orig_dev))
> >> +		return -EOPNOTSUPP;
> >> +
> > What will happen to the "bridge vlan add dev br0 vid X pvid untagged self" when
> > the lower level (the driver) returns -EOPNOTSUPP? Will it avoid adding a vlan on
> > the bridge ?
> 
> No, it will still do it. The reasons are:
> 
> - that's what currently happens anyway: none of the drivers has any
>   support, yet the bridge logic is done
> 
> - -EOPNOTSUPP is what switchdev_port_obj_*() return if switchdev is not
>   compiled in
> 
> In order to suppress the setting, return e.g. -EINVAL:
> 
> # bridge vlan add dev br vid 111 self
> RTNETLINK answers: Invalid argument
> # bridge vlan show dev br
> port    vlan ids
> br       1 PVID Egress Untagged
> 
> Thanks,
> Petr
Ok that's perfect then. As i mentioned it's really useful for a use case i am
doing on a switch that needs it's cpu port configured individually.

Thanks,
Ilias