net: devlink: add warning for ndo_get_port_parent_id set when not needed

Currently if the driver registers devlink port instance, he should set
the devlink port attributes as well. Then the devlink core is able to
obtain switch id itself, no need for driver to implement the ndo.
Once all drivers will implement devlink port registration, this ndo
should be removed. This warning guides new drivers to do things as
they should be done.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/devlink.c

@@ -5358,24 +5358,38 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port,
 void devlink_port_type_eth_set(struct devlink_port *devlink_port,
 			       struct net_device *netdev)
 {
+	const struct net_device_ops *ops = netdev->netdev_ops;
+
 	/* If driver registers devlink port, it should set devlink port
 	 * attributes accordingly so the compat functions are called
 	 * and the original ops are not used.
 	 */
-	if (netdev->netdev_ops->ndo_get_phys_port_name) {
+	if (ops->ndo_get_phys_port_name) {
 		/* Some drivers use the same set of ndos for netdevs
 		 * that have devlink_port registered and also for
 		 * those who don't. Make sure that ndo_get_phys_port_name
 		 * returns -EOPNOTSUPP here in case it is defined.
 		 * Warn if not.
 		 */
-		const struct net_device_ops *ops = netdev->netdev_ops;
 		char name[IFNAMSIZ];
 		int err;
 
 		err = ops->ndo_get_phys_port_name(netdev, name, sizeof(name));
 		WARN_ON(err != -EOPNOTSUPP);
 	}
+	if (ops->ndo_get_port_parent_id) {
+		/* Some drivers use the same set of ndos for netdevs
+		 * that have devlink_port registered and also for
+		 * those who don't. Make sure that ndo_get_port_parent_id
+		 * returns -EOPNOTSUPP here in case it is defined.
+		 * Warn if not.
+		 */
+		struct netdev_phys_item_id ppid;
+		int err;
+
+		err = ops->ndo_get_port_parent_id(netdev, &ppid);
+		WARN_ON(err != -EOPNOTSUPP);
+	}
 	__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, netdev);
 }
 EXPORT_SYMBOL_GPL(devlink_port_type_eth_set);