netdev - [PATCH net-next v3 3/3] dpaa_eth: Use random MAC address when none is given

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Message-Id: <1583428138-12733-4-git-send-email-madalin.bucur@oss.nxp.com>
Date:   Thu,  5 Mar 2020 19:08:58 +0200
From:   Madalin Bucur <madalin.bucur@....nxp.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, s.hauer@...gutronix.de,
        Madalin Bucur <madalin.bucur@....nxp.com>
Subject: [PATCH net-next v3 3/3] 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@...gutronix.de>
Signed-off-by: Madalin Bucur <madalin.bucur@....nxp.com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index e3ac9ec54c7c..190e4478128a 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -259,8 +259,20 @@ static int dpaa_netdev_init(struct net_device *net_dev,
 	net_dev->features |= net_dev->hw_features;
 	net_dev->vlan_features = net_dev->features;
 
-	memcpy(net_dev->perm_addr, mac_addr, net_dev->addr_len);
-	memcpy(net_dev->dev_addr, mac_addr, net_dev->addr_len);
+	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;
 
-- 
2.1.0