The following set of commands:
ip link add br0 type bridge vlan_filtering 1 # vlan_default_pvid 1 is implicit ip link set swp0 master br0 bridge vlan add dev swp0 vid 1
should result in the dropping of untagged and 802.1p-tagged traffic, but we see that it continues to be accepted. Whereas, had we deleted VID 1 instead, the aforementioned dropping would have worked
This is because the ANA_PORT_DROP_CFG update logic doesn't run, because ocelot_vlan_add() only calls ocelot_port_set_pvid() if the new VLAN has the BRIDGE_VLAN_INFO_PVID flag.
Similar to other drivers like mt7530_port_vlan_add() which handle this case correctly, we need to test whether the VLAN we're changing used to have the BRIDGE_VLAN_INFO_PVID flag, but lost it now. That amounts to a PVID deletion and should be treated as such.
Regarding blame attribution: this never worked properly since the introduction of bridge VLAN filtering in commit 7142529f1688 ("net: mscc: ocelot: add VLAN filtering"). However, there was a significant paradigm shift which aligned the ANA_PORT_DROP_CFG register with the PVID concept rather than with the native VLAN concept, and that change wasn't targeted for 'stable'. Realistically, that is as far as this fix needs to be propagated to.
Fixes: be0576fed6d3 ("net: mscc: ocelot: move the logic to drop 802.1p traffic to the pvid deletion") Signed-off-by: Vladimir Oltean vladimir.oltean@nxp.com --- drivers/net/ethernet/mscc/ocelot.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c index ef93df520887..08bee56aea35 100644 --- a/drivers/net/ethernet/mscc/ocelot.c +++ b/drivers/net/ethernet/mscc/ocelot.c @@ -830,6 +830,7 @@ EXPORT_SYMBOL(ocelot_vlan_prepare); int ocelot_vlan_add(struct ocelot *ocelot, int port, u16 vid, bool pvid, bool untagged) { + struct ocelot_port *ocelot_port = ocelot->ports[port]; int err;
/* Ignore VID 0 added to our RX filter by the 8021q module, since @@ -849,6 +850,11 @@ int ocelot_vlan_add(struct ocelot *ocelot, int port, u16 vid, bool pvid, ocelot_bridge_vlan_find(ocelot, vid)); if (err) return err; + } else if (ocelot_port->pvid_vlan && + ocelot_bridge_vlan_find(ocelot, vid) == ocelot_port->pvid_vlan) { + err = ocelot_port_set_pvid(ocelot, port, NULL); + if (err) + return err; }
/* Untagged egress vlan clasification */