[PATCHi v2] ibmveth: Add function to enable live MAC address changes

[Thomas Falcon <tlfalcon@linux.vnet.ibm.com>]

Add a function that will enable changing the MAC address
of an ibmveth interface while it is still running.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
---
v2:
   If h_change_logical_lan_mac fails, dev->dev_addr will not be changed.

 drivers/net/ethernet/ibm/ibmveth.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 21978cc..b6ac676 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1327,6 +1327,29 @@ static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
 	return ret;
 }
 
+static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
+{
+	struct ibmveth_adapter *adapter = netdev_priv(dev);
+	struct sockaddr *addr = p;
+	u64 mac_address;
+	int rc;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	mac_address = ibmveth_encode_mac_addr(addr->sa_data);
+	rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
+	if (rc) {
+		netdev_err(adapter->netdev, "h_change_logical_lan_mac failed "
+			   "with rc=%d\n", rc);
+		return rc;
+	}
+
+	ether_addr_copy(dev->dev_addr, addr->sa_data);
+
+	return 0;
+}
+
 static const struct net_device_ops ibmveth_netdev_ops = {
 	.ndo_open		= ibmveth_open,
 	.ndo_stop		= ibmveth_close,
@@ -1337,7 +1360,7 @@ static const struct net_device_ops ibmveth_netdev_ops = {
 	.ndo_fix_features	= ibmveth_fix_features,
 	.ndo_set_features	= ibmveth_set_features,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_set_mac_address    = ibmveth_set_mac_addr,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ibmveth_poll_controller,
 #endif
-- 
1.8.3.1