rocker: Implement ndo_get_port_parent_id()

mlxsw 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>

drivers/net/ethernet/rocker/rocker_main.c

@@ -2026,6 +2026,18 @@ static void rocker_port_neigh_destroy(struct net_device *dev,
 			    err);
 }
 
+static int rocker_port_get_port_parent_id(struct net_device *dev,
+					  struct netdev_phys_item_id *ppid)
+{
+	const struct rocker_port *rocker_port = netdev_priv(dev);
+	const struct rocker *rocker = rocker_port->rocker;
+
+	ppid->id_len = sizeof(rocker->hw.id);
+	memcpy(&ppid->id, &rocker->hw.id, ppid->id_len);
+
+	return 0;
+}
+
 static const struct net_device_ops rocker_port_netdev_ops = {
 	.ndo_open			= rocker_port_open,
 	.ndo_stop			= rocker_port_stop,
@@ -2035,6 +2047,7 @@ static const struct net_device_ops rocker_port_netdev_ops = {
 	.ndo_get_phys_port_name		= rocker_port_get_phys_port_name,
 	.ndo_change_proto_down		= rocker_port_change_proto_down,
 	.ndo_neigh_destroy		= rocker_port_neigh_destroy,
+	.ndo_get_port_parent_id		= rocker_port_get_port_parent_id,
 };
 
 /********************
@@ -2045,14 +2058,9 @@ static int rocker_port_attr_get(struct net_device *dev,
 				struct switchdev_attr *attr)
 {
 	const struct rocker_port *rocker_port = netdev_priv(dev);
-	const struct rocker *rocker = rocker_port->rocker;
 	int err = 0;
 
 	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
-		attr->u.ppid.id_len = sizeof(rocker->hw.id);
-		memcpy(&attr->u.ppid.id, &rocker->hw.id, attr->u.ppid.id_len);
-		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		err = rocker_world_port_attr_bridge_flags_get(rocker_port,
 							      &attr->u.brport_flags);