TW_UNITHOST_IN
command_packet->unit__hostid = TW_UNITHOST_IN(0, tw_dev->srb[request_id]->device->id);
command_packet->unit__hostid = TW_UNITHOST_IN(0, srb->device->id);
command_packet->unit__hostid = TW_UNITHOST_IN(0, tw_dev->srb[request_id]->device->id);