Re: [PATCH RFC 2/3] net: bridge: set forwarding state on port removal

[Vivien Didelot]

Hi Ido,

Ido Schimmel <idosch@xxxxxxxxxxxx> writes:

> Fri, Feb 12, 2016 at 11:34:19PM IST, vivien.didelot@xxxxxxxxxxxxxxxxxxxx wrote:
>
> Hi Vivien,
>
>>When a port leaves a bridge, the bridge layer puts its STP state to
>>Disabled. If the port is part of an hardware switch, the mode needs to
>>be set to Forwarding in order to restore communication with the CPU.
>>
>>Call br_set_state() in del_nbp(), which only affects switchdev users.
>>
>>Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
>>---
>
> If you have a LAG device in the bridge and one of the ports leaves the
> LAG, then the bridge's teardown sequence isn't invoked and you need to
> do the cleanup yourself, by calling your dsa_slave_bridge_port_leave()
> function (just an example, I know you don't currently support this).
>
> With this change, you'll have to call both the
> dsa_slave_bridge_port_leave() function and dsa_slave_stp_update()
> instead of always calling the same one when leaving a bridge.
>
> Also, I think this kind of things should be done by drivers, as it's
> specific to them. For example, in the case of a physical port, this
> wouldn't benefit mlxsw at all, as STP state is a per-VLAN setting and
> since VLANs were already flushed in nbp_vlan_flush(), then nothing would
> happen.

Thanks for the explanation! I drop this RFC then.

Best,
-v