ixgbe: Add warning when no space left for more MAC filters

Send message to system log when the VF requests another MAC filter
but there is no space left on the device for it.
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Robert E Garrett <robertX.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c

@@ -646,6 +646,9 @@ static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
 			ixgbe_ndo_set_vf_spoofchk(adapter->netdev, vf, false);
 		retval = ixgbe_set_vf_macvlan(adapter, vf, index,
 					      (unsigned char *)(&msgbuf[1]));
+		if (retval == -ENOSPC)
+			e_warn(drv, "VF %d has requested a MACVLAN filter "
+				    "but there is no space for it\n", vf);
 		break;
 	default:
 		e_err(drv, "Unhandled Msg %8.8x\n", msgbuf[0]);