Function mlx5_open_device

dpdk/drivers/common/mlx5/linux/mlx5_common_os.c:778–821

* Function API to open IB device. * * @param cdev * Pointer to the mlx5 device. * @param classes * Chosen classes come from device arguments. * * @return * Pointer to ibv_context on success, NULL otherwise and rte_errno is set. */

 *   Pointer to ibv_context on success, NULL otherwise and rte_errno is set.
 */
static struct ibv_context *
mlx5_open_device(struct mlx5_common_device *cdev, uint32_t classes)
{
	struct ibv_device *ibv;
	struct ibv_context *ctx = NULL;
	int dbmap_env;

	MLX5_ASSERT(cdev->config.device_fd == MLX5_ARG_UNSET);
	if (classes & MLX5_CLASS_VDPA)
		ibv = mlx5_vdpa_get_ibv_dev(cdev->dev);
	else
		ibv = mlx5_os_get_ibv_dev(cdev->dev);
	if (!ibv)
		return NULL;
	DRV_LOG(INFO, "Dev information matches for device \"%s\".", ibv->name);
	/*
	 * Configure environment variable "MLX5_BF_SHUT_UP" before the device
	 * creation. The rdma_core library checks the variable at device
	 * creation and stores the result internally.
	 */
	dbmap_env = mlx5_config_doorbell_mapping_env(cdev->config.dbnc);
	/* Try to open IB device with DV first, then usual Verbs. */
	errno = 0;
	ctx = mlx5_glue->dv_open_device(ibv);
	if (ctx) {
		cdev->config.devx = 1;
	} else if (classes == MLX5_CLASS_ETH) {
		/* The environment variable is still configured. */
		ctx = mlx5_glue->open_device(ibv);
		if (ctx == NULL)
			goto error;
	} else {
		goto error;
	}
	/* The device is created, no need for environment. */
	mlx5_restore_doorbell_mapping_env(dbmap_env);
	return ctx;
error:
	rte_errno = errno ? errno : ENODEV;
	/* The device creation is failed, no need for environment. */
	mlx5_restore_doorbell_mapping_env(dbmap_env);
	DRV_LOG(ERR, "Failed to open IB device \"%s\".", ibv->name);
	return NULL;
}

/**
 * Function API to import IB device.