Function pci_vfio_enable_notifier

dpdk/drivers/bus/pci/linux/pci_vfio.c:329–381

enable notifier (only enable req now) */

/* enable notifier (only enable req now) */
static int
pci_vfio_enable_notifier(struct rte_pci_device *dev, int vfio_dev_fd)
{
	int ret;
	int fd = -1;

	/* set up an eventfd for req notifier */
	fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
	if (fd < 0) {
		RTE_LOG(ERR, EAL, "Cannot set up eventfd, error %i (%s)\n",
			errno, strerror(errno));
		return -1;
	}

	if (rte_intr_fd_set(dev->vfio_req_intr_handle, fd))
		return -1;

	if (rte_intr_type_set(dev->vfio_req_intr_handle, RTE_INTR_HANDLE_VFIO_REQ))
		return -1;

	if (rte_intr_dev_fd_set(dev->vfio_req_intr_handle, vfio_dev_fd))
		return -1;

	ret = rte_intr_callback_register(dev->vfio_req_intr_handle,
					 pci_vfio_req_handler,
					 (void *)&dev->device);
	if (ret) {
		RTE_LOG(ERR, EAL, "Fail to register req notifier handler.\n");
		goto error;
	}

	ret = rte_intr_enable(dev->vfio_req_intr_handle);
	if (ret) {
		RTE_LOG(ERR, EAL, "Fail to enable req notifier.\n");
		ret = rte_intr_callback_unregister(dev->vfio_req_intr_handle,
						 pci_vfio_req_handler,
						 (void *)&dev->device);
		if (ret < 0)
			RTE_LOG(ERR, EAL,
				"Fail to unregister req notifier handler.\n");
		goto error;
	}

	return 0;
error:
	close(fd);

	rte_intr_fd_set(dev->vfio_req_intr_handle, -1);
	rte_intr_type_set(dev->vfio_req_intr_handle, RTE_INTR_HANDLE_UNKNOWN);
	rte_intr_dev_fd_set(dev->vfio_req_intr_handle, -1);

	return -1;
}

/* disable notifier (only disable req now) */
static int