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

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Date:   Tue, 29 May 2018 17:37:30 +0300
From:   Petr Machata <petrm@...lanox.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
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

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