On 2/17/2019 2:04 PM, Russell King - ARM Linux admin wrote:
> On Sun, Feb 17, 2019 at 01:37:19PM -0800, Florian Fainelli wrote:
>>
>>
>> On 2/17/2019 6:25 AM, Russell King wrote:
>>> The Linux bridge implementation allows various properties of the bridge
>>> to be controlled, such as flooding unknown unicast and multicast frames.
>>> This patch adds the necessary DSA infrastructure to allow the Linux
>>> bridge support to control these properties for DSA switches.
>>>
>>> We implement this by providing two new methods: one to get the switch-
>>> wide support bitmask, and another to set the properties.
>>>
>>> Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk>
>>> ---
>>
>> [snip]
>>
>>>
>>> +int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
>>> + struct switchdev_trans *trans)
>>> +{
>>> + struct dsa_switch *ds = dp->ds;
>>> + int port = dp->index;
>>> +
>>> + if (switchdev_trans_ph_prepare(trans))
>>> + return ds->ops->port_bridge_flags ? 0 : -EOPNOTSUPP;
>>> +
>>> + if (ds->ops->port_bridge_flags)
>>> + ds->ops->port_bridge_flags(ds, port, flags);
>>
>> If you have a switch fabric with multiple switches, it seems to me that
>> you also need to make sure that the DSA and CPU ports will have
>> compatible flooding attribute, so just like the port_vlan_add()
>> callback, you probably need to make this a switch fabric-wide event and
>> use a notifier here. At least the DSA ports need to have MC flooding
>> turned on for an user port to also have MC flooding working.
>
> mv88e6xxx already today detects CPU and DSA ports and sets unicast
> and multicast flooding for these ports - see
> mv88e6xxx_setup_egress_floods():
Indeed, probably for historical reasons, since that type of logic should
ideally be migrated to the core DSA layer, this is fine for now though.
>
> /* Upstream ports flood frames with unknown unicast or multicast DA */
> flood = dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port);
> if (chip->info->ops->port_set_egress_floods)
> return chip->info->ops->port_set_egress_floods(chip, port,
> flood, flood);
>
--
Florian
