static virtio_net_ctrl_ack handle_ctrl_mac()

in mlx5/net/mlx5_vnet.c [1471:1515]

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

static virtio_net_ctrl_ack handle_ctrl_mac(struct mlx5_vdpa_dev *mvdev, u8 cmd)
{
	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
	struct mlx5_control_vq *cvq = &mvdev->cvq;
	virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
	struct mlx5_core_dev *pfmdev;
	size_t read;
	u8 mac[ETH_ALEN];

	pfmdev = pci_get_drvdata(pci_physfn(mvdev->mdev->pdev));
	switch (cmd) {
	case VIRTIO_NET_CTRL_MAC_ADDR_SET:
		read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, (void *)mac, ETH_ALEN);
		if (read != ETH_ALEN)
			break;

		if (!memcmp(ndev->config.mac, mac, 6)) {
			status = VIRTIO_NET_OK;
			break;
		}

		if (!is_zero_ether_addr(ndev->config.mac)) {
			if (mlx5_mpfs_del_mac(pfmdev, ndev->config.mac)) {
				mlx5_vdpa_warn(mvdev, "failed to delete old MAC %pM from MPFS table\n",
					       ndev->config.mac);
				break;
			}
		}

		if (mlx5_mpfs_add_mac(pfmdev, mac)) {
			mlx5_vdpa_warn(mvdev, "failed to insert new MAC %pM into MPFS table\n",
				       mac);
			break;
		}

		memcpy(ndev->config.mac, mac, ETH_ALEN);
		status = VIRTIO_NET_OK;
		break;

	default:
		break;
	}

	return status;
}