static int eni_vdpa_probe()

in alibaba/eni_vdpa.c [461:520]

• 49 lines of code
• 7 McCabe index (conditional complexity)

static int eni_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct device *dev = &pdev->dev;
	struct eni_vdpa *eni_vdpa;
	struct virtio_pci_legacy_device *ldev;
	int ret, i;

	ret = pcim_enable_device(pdev);
	if (ret)
		return ret;

	eni_vdpa = vdpa_alloc_device(struct eni_vdpa, vdpa,
				     dev, &eni_vdpa_ops, NULL, false);
	if (IS_ERR(eni_vdpa)) {
		ENI_ERR(pdev, "failed to allocate vDPA structure\n");
		return PTR_ERR(eni_vdpa);
	}

	ldev = &eni_vdpa->ldev;
	ldev->pci_dev = pdev;

	ret = vp_legacy_probe(ldev);
	if (ret) {
		ENI_ERR(pdev, "failed to probe legacy PCI device\n");
		goto err;
	}

	pci_set_master(pdev);
	pci_set_drvdata(pdev, eni_vdpa);

	eni_vdpa->vdpa.dma_dev = &pdev->dev;
	eni_vdpa->queues = eni_vdpa_get_num_queues(eni_vdpa);

	eni_vdpa->vring = devm_kcalloc(&pdev->dev, eni_vdpa->queues,
				      sizeof(*eni_vdpa->vring),
				      GFP_KERNEL);
	if (!eni_vdpa->vring) {
		ret = -ENOMEM;
		ENI_ERR(pdev, "failed to allocate virtqueues\n");
		goto err;
	}

	for (i = 0; i < eni_vdpa->queues; i++) {
		eni_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
		eni_vdpa->vring[i].notify = ldev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
	}
	eni_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;

	ret = vdpa_register_device(&eni_vdpa->vdpa, eni_vdpa->queues);
	if (ret) {
		ENI_ERR(pdev, "failed to register to vdpa bus\n");
		goto err;
	}

	return 0;

err:
	put_device(&eni_vdpa->vdpa.dev);
	return ret;
}