mlxsw: spectrum: Change bridge port attributes only when bridged

Bridge port attributes are offloaded to hardware when invoked with SELF
flag set, but it really makes no sense to reflect them when port is not
bridged.

Allow a user to change these attribute only when port is bridged and
initialize them correctly when joining or leaving a bridge.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -1364,9 +1364,6 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port)
 	mlxsw_sp_port->dev = dev;
 	mlxsw_sp_port->mlxsw_sp = mlxsw_sp;
 	mlxsw_sp_port->local_port = local_port;
-	mlxsw_sp_port->learning = 1;
-	mlxsw_sp_port->learning_sync = 1;
-	mlxsw_sp_port->uc_flood = 1;
 	bytes = DIV_ROUND_UP(VLAN_N_VID, BITS_PER_BYTE);
 	mlxsw_sp_port->active_vlans = kzalloc(bytes, GFP_KERNEL);
 	if (!mlxsw_sp_port->active_vlans) {
@@ -1989,16 +1986,24 @@ static int mlxsw_sp_port_bridge_join(struct mlxsw_sp_port *mlxsw_sp_port)
 	 * own VLANs.
 	 */
 	err = mlxsw_sp_port_kill_vid(dev, 0, 1);
-	if (!err)
+	if (err)
+		return err;
+
+	mlxsw_sp_port->learning = 1;
+	mlxsw_sp_port->learning_sync = 1;
+	mlxsw_sp_port->uc_flood = 1;
 	mlxsw_sp_port->bridged = 1;
 
-	return err;
+	return 0;
 }
 
 static int mlxsw_sp_port_bridge_leave(struct mlxsw_sp_port *mlxsw_sp_port)
 {
 	struct net_device *dev = mlxsw_sp_port->dev;
 
+	mlxsw_sp_port->learning = 0;
+	mlxsw_sp_port->learning_sync = 0;
+	mlxsw_sp_port->uc_flood = 0;
 	mlxsw_sp_port->bridged = 0;
 
 	/* Add implicit VLAN interface in the device, so that untagged

drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c

@@ -252,6 +252,9 @@ static int mlxsw_sp_port_attr_br_flags_set(struct mlxsw_sp_port *mlxsw_sp_port,
 	bool set;
 	int err;
 
+	if (!mlxsw_sp_port->bridged)
+		return -EINVAL;
+
 	if (switchdev_trans_ph_prepare(trans))
 		return 0;