net: dsa: Implement ndo_get_port_parent_id()

DSA implements SWITCHDEV_ATTR_ID_PORT_PARENT_ID and we want to get rid
of switchdev_ops eventually, ease that migration by implementing a
ndo_get_port_parent_id() function which returns what
switchdev_port_attr_get() would do.
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/slave.c

@@ -362,18 +362,23 @@ static int dsa_slave_port_obj_del(struct net_device *dev,
 	return err;
 }
 
-static int dsa_slave_port_attr_get(struct net_device *dev,
-				   struct switchdev_attr *attr)
+static int dsa_slave_get_port_parent_id(struct net_device *dev,
+					struct netdev_phys_item_id *ppid)
 {
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	struct dsa_switch *ds = dp->ds;
 	struct dsa_switch_tree *dst = ds->dst;
 
+	ppid->id_len = sizeof(dst->index);
+	memcpy(&ppid->id, &dst->index, ppid->id_len);
+
+	return 0;
+}
+
+static int dsa_slave_port_attr_get(struct net_device *dev,
+				   struct switchdev_attr *attr)
+{
 	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
-		attr->u.ppid.id_len = sizeof(dst->index);
-		memcpy(&attr->u.ppid.id, &dst->index, attr->u.ppid.id_len);
-		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
 		attr->u.brport_flags_support = 0;
 		break;
@@ -1046,6 +1051,7 @@ static const struct net_device_ops dsa_slave_netdev_ops = {
 	.ndo_get_phys_port_name	= dsa_slave_get_phys_port_name,
 	.ndo_setup_tc		= dsa_slave_setup_tc,
 	.ndo_get_stats64	= dsa_slave_get_stats64,
+	.ndo_get_port_parent_id	= dsa_slave_get_port_parent_id,
 };
 
 static const struct switchdev_ops dsa_slave_switchdev_ops = {