octeon: implement interface rename by label from device tree

adds patch to octeon ethernet driver that to rename interface
name by label from device tree

Tested-by: Johannes Kimmel <[email protected]>
Signed-off-by: Roman Kuzmitskii <[email protected]>

target/linux/octeon/patches-5.4/700-allocate_interface_by_label.patch

@@ -0,0 +1,38 @@
+From: Roman Kuzmitskii <[email protected]>
+Date: Wed, 28 Oct 2020 19:00:00 +0000
+Subject: [PATCH] staging: octeon: add net-labels support
+
+With this patch, device name can be set within dts file
+in the same way as dsa port can.
+
+Add label to pip interface node to use this feature:
+label = "lan0";
+
+Tested-by: Johannes Kimmel <[email protected]>
+Signed-off-by: Roman Kuzmitskii <[email protected]>
+--- a/drivers/staging/octeon/ethernet.c
++++ b/drivers/staging/octeon/ethernet.c
+@@ -407,9 +407,12 @@
+ {
+ 	struct octeon_ethernet *priv = netdev_priv(dev);
+ 	const u8 *mac = NULL;
++	const u8 *label = NULL;
+ 
+-	if (priv->of_node)
++	if (priv->of_node) {
+ 		mac = of_get_mac_address(priv->of_node);
++		label = of_get_property(priv->of_node, "label", NULL);
++	}
+ 
+ 	if (!IS_ERR_OR_NULL(mac))
+ 		ether_addr_copy(dev->dev_addr, mac);
+@@ -444,6 +447,9 @@
+ 	if (dev->netdev_ops->ndo_stop)
+ 		dev->netdev_ops->ndo_stop(dev);
+ 
++	if (!IS_ERR_OR_NULL(label))
++		dev_alloc_name(dev, label);
++
+ 	return 0;
+ }
+