Function ena_setup_rx_intr

dpdk/drivers/net/ena/ena_ethdev.c:3708–3773

}

static int ena_setup_rx_intr(struct rte_eth_dev *dev)
{
	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
	struct rte_intr_handle *intr_handle = pci_dev->intr_handle;
	int rc;
	uint16_t vectors_nb, i;
	bool rx_intr_requested = dev->data->dev_conf.intr_conf.rxq;

	if (!rx_intr_requested)
		return 0;

	if (!rte_intr_cap_multiple(intr_handle)) {
		PMD_DRV_LOG(ERR,
			"Rx interrupt requested, but it isn't supported by the PCI driver\n");
		return -ENOTSUP;
	}

	/* Disable interrupt mapping before the configuration starts. */
	rte_intr_disable(intr_handle);

	/* Verify if there are enough vectors available. */
	vectors_nb = dev->data->nb_rx_queues;
	if (vectors_nb > RTE_MAX_RXTX_INTR_VEC_ID) {
		PMD_DRV_LOG(ERR,
			"Too many Rx interrupts requested, maximum number: %d\n",
			RTE_MAX_RXTX_INTR_VEC_ID);
		rc = -ENOTSUP;
		goto enable_intr;
	}

	/* Allocate the vector list */
	if (rte_intr_vec_list_alloc(intr_handle, "intr_vec",
					   dev->data->nb_rx_queues)) {
		PMD_DRV_LOG(ERR,
			"Failed to allocate interrupt vector for %d queues\n",
			dev->data->nb_rx_queues);
		rc = -ENOMEM;
		goto enable_intr;
	}

	rc = rte_intr_efd_enable(intr_handle, vectors_nb);
	if (rc != 0)
		goto free_intr_vec;

	if (!rte_intr_allow_others(intr_handle)) {
		PMD_DRV_LOG(ERR,
			"Not enough interrupts available to use both ENA Admin and Rx interrupts\n");
		goto disable_intr_efd;
	}

	for (i = 0; i < vectors_nb; ++i)
		if (rte_intr_vec_list_index_set(intr_handle, i,
					   RTE_INTR_VEC_RXTX_OFFSET + i))
			goto disable_intr_efd;

	rte_intr_enable(intr_handle);
	return 0;