static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
	if (dev != blackhole_netdev) {
		/* Join interface-local all-node multicast group */
		ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);

		/* Join all-node multicast group */
		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);

		/* Join all-router multicast group if forwarding is set */
		if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
	}
}



static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
			bool global)
{
	int err;

	netif_addr_lock_bh(dev);
	err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
			       NETDEV_HW_ADDR_T_MULTICAST, global, false,
			       0, false);
	if (!err)
		__dev_set_rx_mode(dev);
	netif_addr_unlock_bh(dev);
	return err;
}
/**
 *	dev_mc_add - Add a multicast address
 *	@dev: device
 *	@addr: address to add
 *
 *	Add a multicast address to the device or increase
 *	the reference count if it already exists.
 */
int dev_mc_add(struct net_device *dev, const unsigned char *addr)
{
	return __dev_mc_add(dev, addr, false);
}
EXPORT_SYMBOL(dev_mc_add);






/**
 * e1000e_set_rx_mode - secondary unicast, Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The ndo_set_rx_mode entry point is called whenever the unicast or multicast
 * address list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper unicast, multicast,
 * promiscuous mode, and all-multi behavior.
 **/
static void e1000e_set_rx_mode(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl;

	if (pm_runtime_suspended(netdev->dev.parent))
		return;

	/* Check for Promiscuous and All Multicast modes */
	rctl = er32(RCTL);

	/* clear the affected bits */
	rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);

	if (netdev->flags & IFF_PROMISC) {
		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
		/* Do not hardware filter VLANs in promisc mode */
		e1000e_vlan_filter_disable(adapter);
	} else {
		int count;

		if (netdev->flags & IFF_ALLMULTI) {
			rctl |= E1000_RCTL_MPE;
		} else {
			/* Write addresses to the MTA, if the attempt fails
			 * then we should just turn on promiscuous mode so
			 * that we can at least receive multicast traffic
			 */
			count = e1000e_write_mc_addr_list(netdev);
			if (count < 0)
				rctl |= E1000_RCTL_MPE;
		}
		e1000e_vlan_filter_enable(adapter);
		/* Write addresses to available RAR registers, if there is not
		 * sufficient space to store all the addresses then enable
		 * unicast promiscuous mode
		 */
		count = e1000e_write_uc_addr_list(netdev);
		if (count < 0)
			rctl |= E1000_RCTL_UPE;
	}

	ew32(RCTL, rctl);

	if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
		e1000e_vlan_strip_enable(adapter);
	else
		e1000e_vlan_strip_disable(adapter);
}




/**
 * e1000e_write_mc_addr_list - write multicast addresses to MTA
 * @netdev: network interface device structure
 *
 * Writes multicast address list to the MTA hash table.
 * Returns: -ENOMEM on failure
 *                0 on no addresses written
 *                X on writing X addresses to MTA
 */
static int e1000e_write_mc_addr_list(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct netdev_hw_addr *ha;
	u8 *mta_list;
	int i;

	if (netdev_mc_empty(netdev)) {
		/* nothing to program, so clear mc list */
		hw->mac.ops.update_mc_addr_list(hw, NULL, 0);
		return 0;
	}

	mta_list = kcalloc(netdev_mc_count(netdev), ETH_ALEN, GFP_ATOMIC);
	if (!mta_list)
		return -ENOMEM;

	/* update_mc_addr_list expects a packed array of only addresses. */
	i = 0;
	netdev_for_each_mc_addr(ha, netdev)
	    memcpy(mta_list + (i++ * ETH_ALEN), ha->addr, ETH_ALEN);

	hw->mac.ops.update_mc_addr_list(hw, mta_list, i);
	kfree(mta_list);

	return netdev_mc_count(netdev);
}