static int gve_init_priv()

in build/gve_main.c [2569:2669]

• 83 lines of code
• 11 McCabe index (conditional complexity)

static int gve_init_priv(struct gve_priv *priv, bool skip_describe_device)
{
	int num_ntfy;
	int err;

	/* Set up the adminq */
	err = gve_adminq_alloc(&priv->pdev->dev, priv);
	if (err) {
		dev_err(&priv->pdev->dev,
			"Failed to alloc admin queue: err=%d\n", err);
		return err;
	}

	err = gve_verify_driver_compatibility(priv);
	if (err) {
		dev_err(&priv->pdev->dev,
			"Could not verify driver compatibility: err=%d\n", err);
		goto err;
	}

	priv->num_registered_pages = 0;

	if (skip_describe_device)
		goto setup_device;

	priv->queue_format = GVE_QUEUE_FORMAT_UNSPECIFIED;
	/* Get the initial information we need from the device */
	err = gve_adminq_describe_device(priv);
	if (err) {
		dev_err(&priv->pdev->dev,
			"Could not get device information: err=%d\n", err);
		goto err;
	}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0))
	priv->dev->mtu = priv->max_mtu;
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0))
	priv->dev->mtu = priv->max_mtu;
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) */
	priv->dev->mtu = priv->dev->max_mtu;
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) */
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) */
	num_ntfy = pci_msix_vec_count(priv->pdev);
	if (num_ntfy <= 0) {
		dev_err(&priv->pdev->dev,
			"could not count MSI-x vectors: err=%d\n", num_ntfy);
		err = num_ntfy;
		goto err;
	} else if (num_ntfy < GVE_MIN_MSIX) {
		dev_err(&priv->pdev->dev, "gve needs at least %d MSI-x vectors, but only has %d\n",
			GVE_MIN_MSIX, num_ntfy);
		err = -EINVAL;
		goto err;
	}

	/* Big TCP is only supported on DQ*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(6,2,1))
	if (!gve_is_gqi(priv))
		netif_set_tso_max_size(priv->dev, GVE_DQO_TX_MAX);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(6,2,1) */

	priv->rx_copybreak = GVE_DEFAULT_RX_COPYBREAK;
	/* gvnic has one Notification Block per MSI-x vector, except for the
	 * management vector
	 */
	priv->num_ntfy_blks = (num_ntfy - 1) & ~0x1;
	priv->mgmt_msix_idx = priv->num_ntfy_blks;

	priv->tx_cfg.max_queues =
		min_t(int, priv->tx_cfg.max_queues, priv->num_ntfy_blks / 2);
	priv->rx_cfg.max_queues =
		min_t(int, priv->rx_cfg.max_queues, priv->num_ntfy_blks / 2);

	priv->tx_cfg.num_queues = priv->tx_cfg.max_queues;
	priv->rx_cfg.num_queues = priv->rx_cfg.max_queues;
	if (priv->default_num_queues > 0) {
		priv->tx_cfg.num_queues = min_t(int, priv->default_num_queues,
						priv->tx_cfg.num_queues);
		priv->rx_cfg.num_queues = min_t(int, priv->default_num_queues,
						priv->rx_cfg.num_queues);
	}

	dev_info(&priv->pdev->dev, "TX queues %d, RX queues %d\n",
		 priv->tx_cfg.num_queues, priv->rx_cfg.num_queues);
	dev_info(&priv->pdev->dev, "Max TX queues %d, Max RX queues %d\n",
		 priv->tx_cfg.max_queues, priv->rx_cfg.max_queues);

	if (!gve_is_gqi(priv)) {
		priv->tx_coalesce_usecs = GVE_TX_IRQ_RATELIMIT_US_DQO;
		priv->rx_coalesce_usecs = GVE_RX_IRQ_RATELIMIT_US_DQO;
	}

setup_device:
	gve_set_netdev_xdp_features(priv);
	err = gve_setup_device_resources(priv);
	if (!err)
		return 0;
err:
	gve_adminq_free(&priv->pdev->dev, priv);
	return err;
}