int prefix_stop(gld_mac_info_t *macinfo);
gldm_stop() disables the device from generating any interrupts and stops the driver from calling gld_recv() for delivering data packets to GLDv2. GLDv2 depends on the gldm_stop() routine to ensure that the device will no longer interrupt. gldm_stop() must do so without fail. This function should always return GLD_SUCCESS.