dpaa_eth: Use random MAC address when none is given

If there is no valid MAC address in the device tree, use a random
MAC address.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c

@@ -233,8 +233,20 @@ static int dpaa_netdev_init(struct net_device *net_dev,
 	net_dev->features |= net_dev->hw_features;
 	net_dev->vlan_features = net_dev->features;
 
+	if (is_valid_ether_addr(mac_addr)) {
 		memcpy(net_dev->perm_addr, mac_addr, net_dev->addr_len);
 		memcpy(net_dev->dev_addr, mac_addr, net_dev->addr_len);
+	} else {
+		eth_hw_addr_random(net_dev);
+		err = priv->mac_dev->change_addr(priv->mac_dev->fman_mac,
+			(enet_addr_t *)net_dev->dev_addr);
+		if (err) {
+			dev_err(dev, "Failed to set random MAC address\n");
+			return -EINVAL;
+		}
+		dev_info(dev, "Using random MAC address: %pM\n",
+			 net_dev->dev_addr);
+	}
 
 	net_dev->ethtool_ops = &dpaa_ethtool_ops;