static int eni_vdpa_request_irq()

in alibaba/eni_vdpa.c [159:209]

• 46 lines of code
• 5 McCabe index (conditional complexity)

static int eni_vdpa_request_irq(struct eni_vdpa *eni_vdpa)
{
	struct virtio_pci_legacy_device *ldev = &eni_vdpa->ldev;
	struct pci_dev *pdev = ldev->pci_dev;
	int i, ret, irq;
	int queues = eni_vdpa->queues;
	int vectors = queues + 1;

	ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
	if (ret != vectors) {
		ENI_ERR(pdev,
			"failed to allocate irq vectors want %d but %d\n",
			vectors, ret);
		return ret;
	}

	eni_vdpa->vectors = vectors;

	for (i = 0; i < queues; i++) {
		snprintf(eni_vdpa->vring[i].msix_name, ENI_MSIX_NAME_SIZE,
			 "eni-vdpa[%s]-%d\n", pci_name(pdev), i);
		irq = pci_irq_vector(pdev, i);
		ret = devm_request_irq(&pdev->dev, irq,
				       eni_vdpa_vq_handler,
				       0, eni_vdpa->vring[i].msix_name,
				       &eni_vdpa->vring[i]);
		if (ret) {
			ENI_ERR(pdev, "failed to request irq for vq %d\n", i);
			goto err;
		}
		vp_legacy_queue_vector(ldev, i, i);
		eni_vdpa->vring[i].irq = irq;
	}

	snprintf(eni_vdpa->msix_name, ENI_MSIX_NAME_SIZE, "eni-vdpa[%s]-config\n",
		 pci_name(pdev));
	irq = pci_irq_vector(pdev, queues);
	ret = devm_request_irq(&pdev->dev, irq, eni_vdpa_config_handler, 0,
			       eni_vdpa->msix_name, eni_vdpa);
	if (ret) {
		ENI_ERR(pdev, "failed to request irq for config vq %d\n", i);
		goto err;
	}
	vp_legacy_config_vector(ldev, queues);
	eni_vdpa->config_irq = irq;

	return 0;
err:
	eni_vdpa_free_irq(eni_vdpa);
	return ret;
}