Function rte_eth_dev_configure

dpdk/lib/ethdev/rte_ethdev.c:1287–1618

}

int
rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
		      const struct rte_eth_conf *dev_conf)
{
	enum rte_eth_hash_function algorithm;
	struct rte_eth_dev *dev;
	struct rte_eth_dev_info dev_info;
	struct rte_eth_conf orig_conf;
	int diag;
	int ret;
	uint16_t old_mtu;

	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
	dev = &rte_eth_devices[port_id];

	if (dev_conf == NULL) {
		RTE_ETHDEV_LOG(ERR,
			"Cannot configure ethdev port %u from NULL config\n",
			port_id);
		return -EINVAL;
	}

	if (*dev->dev_ops->dev_configure == NULL)
		return -ENOTSUP;

	if (dev->data->dev_started) {
		RTE_ETHDEV_LOG(ERR,
			"Port %u must be stopped to allow configuration\n",
			port_id);
		return -EBUSY;
	}

	/*
	 * Ensure that "dev_configured" is always 0 each time prepare to do
	 * dev_configure() to avoid any non-anticipated behaviour.
	 * And set to 1 when dev_configure() is executed successfully.
	 */
	dev->data->dev_configured = 0;

	 /* Store original config, as rollback required on failure */
	memcpy(&orig_conf, &dev->data->dev_conf, sizeof(dev->data->dev_conf));

	/*
	 * Copy the dev_conf parameter into the dev structure.
	 * rte_eth_dev_info_get() requires dev_conf, copy it before dev_info get
	 */
	if (dev_conf != &dev->data->dev_conf)
		memcpy(&dev->data->dev_conf, dev_conf,
		       sizeof(dev->data->dev_conf));

	/* Backup mtu for rollback */
	old_mtu = dev->data->mtu;

	/* fields must be zero to reserve them for future ABI changes */
	if (dev_conf->rxmode.reserved_64s[0] != 0 ||
	    dev_conf->rxmode.reserved_64s[1] != 0 ||
	    dev_conf->rxmode.reserved_ptrs[0] != NULL ||
	    dev_conf->rxmode.reserved_ptrs[1] != NULL) {