NVME_OPC_ASYNC_EVENT_REQUEST
req->cmd.opc = NVME_OPC_ASYNC_EVENT_REQUEST;
if (tr->req->cmd.opc != NVME_OPC_ASYNC_EVENT_REQUEST) {
case NVME_OPC_ASYNC_EVENT_REQUEST:
cmd.opc = NVME_OPC_ASYNC_EVENT_REQUEST;
case NVME_OPC_ASYNC_EVENT_REQUEST:
case NVME_OPC_ASYNC_EVENT_REQUEST: