ixgbevf: Add error messages on vlan error

ixgbevf did not provide an error in dmesg if VLAN addition failed.

Add two descriptive failure messages in the kernel log.
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

@@ -2044,12 +2044,16 @@ static int ixgbevf_vlan_rx_add_vid(struct net_device *netdev,
 
 	spin_unlock_bh(&adapter->mbx_lock);
 
-	/* translate error return types so error makes sense */
-	if (err == IXGBE_ERR_MBX)
-		return -EIO;
+	if (err) {
+		netdev_err(netdev, "VF could not set VLAN %d\n", vid);
+
+		/* translate error return types so error makes sense */
+		if (err == IXGBE_ERR_MBX)
+			return -EIO;
 
-	if (err == IXGBE_ERR_INVALID_ARGUMENT)
-		return -EACCES;
+		if (err == IXGBE_ERR_INVALID_ARGUMENT)
+			return -EACCES;
+	}
 
 	set_bit(vid, adapter->active_vlans);
 
@@ -2070,6 +2074,9 @@ static int ixgbevf_vlan_rx_kill_vid(struct net_device *netdev,
 
 	spin_unlock_bh(&adapter->mbx_lock);
 
+	if (err)
+		netdev_err(netdev, "Could not remove VLAN %d\n", vid);
+
 	clear_bit(vid, adapter->active_vlans);
 
 	return err;