[PATCH net] ibmvnic: Return failure on attempted mtu change

[John Allen <jallen@linux.vnet.ibm.com>]

Changing the mtu is currently not supported in the ibmvnic driver.

Implement .ndo_change_mtu in the driver so that attempting to use ifconfig
to change the mtu will fail and present the user with an error message.

Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
---
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 4f2d329..8ff6c74 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1468,6 +1468,11 @@ static void ibmvnic_netpoll_controller(struct net_device *dev)
 }
 #endif

+static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	return -EOPNOTSUPP;
+}
+
 static const struct net_device_ops ibmvnic_netdev_ops = {
 	.ndo_open		= ibmvnic_open,
 	.ndo_stop		= ibmvnic_close,
@@ -1479,6 +1484,7 @@ static void ibmvnic_netpoll_controller(struct net_device *dev)
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ibmvnic_netpoll_controller,
 #endif
+	.ndo_change_mtu		= ibmvnic_change_mtu,
 };

 /* ethtool functions */