virtio_net: Allow setting the MAC address of the NIC

Many physical NICs let the OS re-program the "hardware" MAC
address.  Virtual NICs should allow this too.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index e68813a246db..3d0033920224 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -565,6 +565,22 @@ stop_queue:
         goto done;
 }
 
+static int virtnet_set_mac_address(struct net_device *dev, void *p)
+{
+        struct virtnet_info *vi = netdev_priv(dev);
+        struct virtio_device *vdev = vi->vdev;
+        int ret;
+
+        ret = eth_mac_addr(dev, p);
+        if (ret)
+                return ret;
+
+        vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
+                          dev->dev_addr, dev->addr_len);
+
+        return 0;
+}
+
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void virtnet_netpoll(struct net_device *dev)
 {
@@ -774,7 +790,7 @@ static const struct net_device_ops virtnet_netdev = {
         .ndo_stop            = virtnet_close,
         .ndo_start_xmit      = start_xmit,
         .ndo_validate_addr   = eth_validate_addr,
-        .ndo_set_mac_address = eth_mac_addr,
+        .ndo_set_mac_address = virtnet_set_mac_address,
         .ndo_set_rx_mode     = virtnet_set_rx_mode,
         .ndo_change_mtu      = virtnet_change_mtu,
         .ndo_vlan_rx_add_vid = virnet_vlan_rx_add_vid,
@@ -860,8 +876,11 @@ static int virtnet_probe(struct virtio_device *vdev)
                 vdev->config->get(vdev,
                                   offsetof(struct virtio_net_config, mac),
                                   dev->dev_addr, dev->addr_len);
-        } else
+        } else {
                 random_ether_addr(dev->dev_addr);
+                vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
+                                  dev->dev_addr, dev->addr_len);
+        }
 
         /* Set up our device-specific information */
         vi = netdev_priv(dev);