Function cdx_scan_one

dpdk/drivers/bus/cdx/cdx.c:189–258

* Scan one cdx sysfs entry, and fill the devices list from it. * It checks if the CDX device is bound to vfio-cdx driver. In case * the device is vfio bound, it reads the vendor and device id and * stores it for device-driver matching. */

 * stores it for device-driver matching.
 */
static int
cdx_scan_one(const char *dirname, const char *dev_name)
{
	char filename[PATH_MAX];
	struct rte_cdx_device *dev = NULL;
	char driver[PATH_MAX];
	unsigned long tmp;
	int ret;

	dev = calloc(1, sizeof(*dev));
	if (!dev)
		return -ENOMEM;

	dev->device.bus = &rte_cdx_bus.bus;
	memcpy(dev->name, dev_name, RTE_DEV_NAME_MAX_LEN);
	dev->device.name = dev->name;

	/* parse driver */
	snprintf(filename, sizeof(filename), "%s/driver", dirname);
	ret = cdx_get_kernel_driver_by_path(filename, driver, sizeof(driver));
	if (ret < 0) {
		CDX_BUS_ERR("Fail to get kernel driver");
		free(dev);
		return -1;
	}

	/* Allocate interrupt instance for cdx device */
	dev->intr_handle =
		rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE);
	if (dev->intr_handle == NULL) {
		CDX_BUS_ERR("Failed to create interrupt instance for %s",
			dev->device.name);
		free(dev);
		return -ENOMEM;
	}

	/*
	 * Check if device is bound to 'vfio-cdx' driver, so that user-space
	 * can gracefully access the device.
	 */
	if (ret || strcmp(driver, "vfio-cdx")) {
		ret = 0;
		goto err;
	}

	/* get vendor id */
	snprintf(filename, sizeof(filename), "%s/vendor", dirname);
	if (eal_parse_sysfs_value(filename, &tmp) < 0) {
		ret = -1;
		goto err;
	}
	dev->id.vendor_id = (uint16_t)tmp;

	/* get device id */
	snprintf(filename, sizeof(filename), "%s/device", dirname);
	if (eal_parse_sysfs_value(filename, &tmp) < 0) {
		ret = -1;
		goto err;