net: dsa: check bridge VLAN in slave operations

The bridge VLANs are not offloaded by dsa_port_vlan_* if the port is
not bridged or if its bridge is not VLAN aware.

This is a good thing but other corners of DSA, such as the tag_8021q
driver, may need to program VLANs regardless the bridge state.

And also because bridge_dev is specific to user ports anyway, move
these checks were it belongs, one layer up in the slave code.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Suggested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/port.c

@@ -348,10 +348,7 @@ int dsa_port_vlan_add(struct dsa_port *dp,
 		.vlan = vlan,
 	};
 
-	if (!dp->bridge_dev || br_vlan_enabled(dp->bridge_dev))
 	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
-
-	return 0;
 }
 
 int dsa_port_vlan_del(struct dsa_port *dp,
@@ -363,10 +360,7 @@ int dsa_port_vlan_del(struct dsa_port *dp,
 		.vlan = vlan,
 	};
 
-	if (!dp->bridge_dev || br_vlan_enabled(dp->bridge_dev))
 	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
-
-	return 0;
 }
 
 int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags)

net/dsa/slave.c

@@ -323,6 +323,9 @@ static int dsa_slave_vlan_add(struct net_device *dev,
 	if (obj->orig_dev != dev)
 		return -EOPNOTSUPP;
 
+	if (dp->bridge_dev && !br_vlan_enabled(dp->bridge_dev))
+		return 0;
+
 	vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
 
 	err = dsa_port_vlan_add(dp, &vlan, trans);
@@ -377,6 +380,9 @@ static int dsa_slave_vlan_del(struct net_device *dev,
 	if (obj->orig_dev != dev)
 		return -EOPNOTSUPP;
 
+	if (dp->bridge_dev && !br_vlan_enabled(dp->bridge_dev))
+		return 0;
+
 	return dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
 }
 
@@ -1099,6 +1105,9 @@ static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
 	 * need to emulate the switchdev prepare + commit phase.
 	 */
 	if (dp->bridge_dev) {
+		if (!br_vlan_enabled(dp->bridge_dev))
+			return 0;
+
 		/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
 		 * device, respectively the VID is not found, returning
 		 * 0 means success, which is a failure for us here.
@@ -1126,6 +1135,9 @@ static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
 	 * need to emulate the switchdev prepare + commit phase.
 	 */
 	if (dp->bridge_dev) {
+		if (!br_vlan_enabled(dp->bridge_dev))
+			return 0;
+
 		/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
 		 * device, respectively the VID is not found, returning
 		 * 0 means success, which is a failure for us here.