int gve_adminq_describe_device()

in google/gve/gve_adminq.c [974:1083]

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

int gve_adminq_describe_device(struct gve_priv *priv)
{
	struct gve_device_option_flow_steering *dev_op_flow_steering = NULL;
	struct gve_device_option_buffer_sizes *dev_op_buffer_sizes = NULL;
	struct gve_device_option_jumbo_frames *dev_op_jumbo_frames = NULL;
	struct gve_device_option_modify_ring *dev_op_modify_ring = NULL;
	struct gve_device_option_rss_config *dev_op_rss_config = NULL;
	struct gve_device_option_gqi_rda *dev_op_gqi_rda = NULL;
	struct gve_device_option_gqi_qpl *dev_op_gqi_qpl = NULL;
	struct gve_device_option_dqo_rda *dev_op_dqo_rda = NULL;
	struct gve_device_option_dqo_qpl *dev_op_dqo_qpl = NULL;
	struct gve_device_descriptor *descriptor;
	u32 supported_features_mask = 0;
	union gve_adminq_command cmd;
	dma_addr_t descriptor_bus;
	int err = 0;
	u8 *mac;
	u16 mtu;

	memset(&cmd, 0, sizeof(cmd));
	descriptor = dma_pool_alloc(priv->adminq_pool, GFP_KERNEL,
				    &descriptor_bus);
	if (!descriptor)
		return -ENOMEM;
	cmd.opcode = cpu_to_be32(GVE_ADMINQ_DESCRIBE_DEVICE);
	cmd.describe_device.device_descriptor_addr =
						cpu_to_be64(descriptor_bus);
	cmd.describe_device.device_descriptor_version =
			cpu_to_be32(GVE_ADMINQ_DEVICE_DESCRIPTOR_VERSION);
	cmd.describe_device.available_length =
		cpu_to_be32(GVE_ADMINQ_BUFFER_SIZE);

	err = gve_adminq_execute_cmd(priv, &cmd);
	if (err)
		goto free_device_descriptor;

	err = gve_process_device_options(priv, descriptor, &dev_op_gqi_rda,
					 &dev_op_gqi_qpl, &dev_op_dqo_rda,
					 &dev_op_jumbo_frames, &dev_op_dqo_qpl,
					 &dev_op_buffer_sizes,
					 &dev_op_flow_steering,
					 &dev_op_rss_config,
					 &dev_op_modify_ring);
	if (err)
		goto free_device_descriptor;

	/* If the GQI_RAW_ADDRESSING option is not enabled and the queue format
	 * is not set to GqiRda, choose the queue format in a priority order:
	 * DqoRda, DqoQpl, GqiRda, GqiQpl. Use GqiQpl as default.
	 */
	if (dev_op_dqo_rda) {
		priv->queue_format = GVE_DQO_RDA_FORMAT;
		dev_info(&priv->pdev->dev,
			 "Driver is running with DQO RDA queue format.\n");
		supported_features_mask =
			be32_to_cpu(dev_op_dqo_rda->supported_features_mask);
	} else if (dev_op_dqo_qpl) {
		priv->queue_format = GVE_DQO_QPL_FORMAT;
		supported_features_mask =
			be32_to_cpu(dev_op_dqo_qpl->supported_features_mask);
	}  else if (dev_op_gqi_rda) {
		priv->queue_format = GVE_GQI_RDA_FORMAT;
		dev_info(&priv->pdev->dev,
			 "Driver is running with GQI RDA queue format.\n");
		supported_features_mask =
			be32_to_cpu(dev_op_gqi_rda->supported_features_mask);
	} else if (priv->queue_format == GVE_GQI_RDA_FORMAT) {
		dev_info(&priv->pdev->dev,
			 "Driver is running with GQI RDA queue format.\n");
	} else {
		priv->queue_format = GVE_GQI_QPL_FORMAT;
		if (dev_op_gqi_qpl)
			supported_features_mask =
				be32_to_cpu(dev_op_gqi_qpl->supported_features_mask);
		dev_info(&priv->pdev->dev,
			 "Driver is running with GQI QPL queue format.\n");
	}

	/* set default descriptor counts */
	gve_set_default_desc_cnt(priv, descriptor);

	/* DQO supports LRO. */
	if (!gve_is_gqi(priv))
		priv->dev->hw_features |= NETIF_F_LRO;

	priv->max_registered_pages =
				be64_to_cpu(descriptor->max_registered_pages);
	mtu = be16_to_cpu(descriptor->mtu);
	if (mtu < ETH_MIN_MTU) {
		dev_err(&priv->pdev->dev, "MTU %d below minimum MTU\n", mtu);
		err = -EINVAL;
		goto free_device_descriptor;
	}
	priv->dev->max_mtu = mtu;
	priv->num_event_counters = be16_to_cpu(descriptor->counters);
	eth_hw_addr_set(priv->dev, descriptor->mac);
	mac = descriptor->mac;
	dev_info(&priv->pdev->dev, "MAC addr: %pM\n", mac);
	priv->tx_pages_per_qpl = be16_to_cpu(descriptor->tx_pages_per_qpl);
	priv->default_num_queues = be16_to_cpu(descriptor->default_num_queues);

	gve_enable_supported_features(priv, supported_features_mask,
				      dev_op_jumbo_frames, dev_op_dqo_qpl,
				      dev_op_buffer_sizes, dev_op_flow_steering,
				      dev_op_rss_config, dev_op_modify_ring);

free_device_descriptor:
	dma_pool_free(priv->adminq_pool, descriptor, descriptor_bus);
	return err;
}