[PATCH net-next v2 RESEND 1/4] macvlan: support mac address changes when fwd_priv is enable

[Ding Tianhong <dingtianhong@huawei.com>]

If lowerdev supports L2 forwarding offload, the macvlan's hw address
will be set to the rar of the lowerdev and no need to set uc list,
and when the macvlan's hw address changes, the macvlan should remove
the old fwd and rebuild a new fwd for the macvlan.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
---
 drivers/net/macvlan.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 453d55a..67485ab 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -523,6 +523,27 @@ static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
 		if (macvlan_addr_busy(vlan->port, addr))
 			return -EBUSY;
 
+		if (vlan->fwd_priv) {
+			lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
+								   vlan->fwd_priv);
+			vlan->fwd_priv = NULL;
+			ether_addr_copy(dev->perm_addr, dev->dev_addr);
+			ether_addr_copy(dev->dev_addr, addr);
+			vlan->fwd_priv =
+			    lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev,
+								       dev);
+			/* If we get a NULL pointer back, or if we get an error
+			 * then we should restore the old mac address and fwd.
+			 */
+			if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
+				ether_addr_copy(dev->dev_addr, dev->perm_addr);
+				vlan->fwd_priv =
+				    lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev,
+									       dev);
+				return -EINVAL;
+			}
+			return 0;
+		}
 		if (!vlan->port->passthru) {
 			err = dev_uc_add(lowerdev, addr);
 			if (err)
-- 
1.8.0