Re: [PATCH net] net: dsa: only unset VLAN filtering when last port leaves last VLAN-aware bridge

On 3/8/21 5:55 AM, Vladimir Oltean wrote:

From: Vladimir Oltean <vladimir.oltean@nxp.com>

DSA is aware of switches with global VLAN filtering since the blamed
commit, but it makes a bad decision when multiple bridges are spanning
the same switch:

ip link add br0 type bridge vlan_filtering 1
ip link add br1 type bridge vlan_filtering 1
ip link set swp2 master br0
ip link set swp3 master br0
ip link set swp4 master br1
ip link set swp5 master br1
ip link set swp5 nomaster
ip link set swp4 nomaster
[138665.939930] sja1105 spi0.1: port 3: dsa_core: VLAN filtering is a global setting
[138665.947514] DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE

When all ports leave br1, DSA blindly attempts to disable VLAN filtering
on the switch, ignoring the fact that br0 still exists and is VLAN-aware
too. It fails while doing that.

This patch checks whether any port exists at all and is under a
VLAN-aware bridge.

Fixes: d371b7c92d19 ("net: dsa: Unset vlan_filtering when ports leave the bridge")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>

This uncovered a bug in the bcm_sf2 driver which failed to set
ds->vlan_filtering_is_global so with that fixed, I was able to verify
that the scenario above would produce the above message and failure, and
with the patch applied this works correctly as expected without
disabling VLAN filtering on br0. When the last port on br0 leaves the
bridge however, VLAN filtering is turned off since there is no more user
requiring it.

Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

Thanks!
--
Florian