vlan: add neigh_setup

In case the real device has a neigh_setup function, this
neigh_setup function should be used for the vlan device.
Signed-off-by: NFrank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/8021q/vlan_dev.c

@@ -546,6 +546,18 @@ static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return err;
 }
 
+static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
+{
+	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int err = 0;
+
+	if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
+		err = ops->ndo_neigh_setup(dev, pa);
+
+	return err;
+}
+
 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 {
 	struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
@@ -713,6 +725,7 @@ static const struct net_device_ops vlan_netdev_ops = {
 	.ndo_set_multicast_list	= vlan_dev_set_rx_mode,
 	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
 	.ndo_do_ioctl		= vlan_dev_ioctl,
+	.ndo_neigh_setup	= vlan_dev_neigh_setup,
 };
 
 static const struct net_device_ops vlan_netdev_accel_ops = {
@@ -728,6 +741,7 @@ static const struct net_device_ops vlan_netdev_accel_ops = {
 	.ndo_set_multicast_list	= vlan_dev_set_rx_mode,
 	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
 	.ndo_do_ioctl		= vlan_dev_ioctl,
+	.ndo_neigh_setup	= vlan_dev_neigh_setup,
 };
 
 void vlan_setup(struct net_device *dev)