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SubjectRe: [PATCH 5/6] vdpa: introduce virtio pci driver
On Fri, May 29, 2020 at 04:03:02PM +0800, Jason Wang wrote:
> +static void vp_vdpa_set_vq_ready(struct vdpa_device *vdpa,
> + u16 qid, bool ready)
> +{
> + struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> +
> + vp_iowrite16(qid, &vp_vdpa->common->queue_select);
> + vp_iowrite16(ready, &vp_vdpa->common->queue_enable);
> +}
> +

Looks like this needs to check and just skip the write if
ready == 0, right? Of course vdpa core then insists on calling
vp_vdpa_get_vq_ready which will warn. Maybe just drop the
check from core, move it to drivers which need it?

...


> +static const struct pci_device_id vp_vdpa_id_table[] = {
> + { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },
> + { 0 }
> +};

This looks like it'll create a mess with either virtio pci
or vdpa being loaded at random. Maybe just don't specify
any IDs for now. Down the road we could get a
distinct vendor ID or a range of device IDs for this.

> +MODULE_DEVICE_TABLE(pci, vp_vdpa_id_table);
> +
> +static struct pci_driver vp_vdpa_driver = {
> + .name = "vp-vdpa",
> + .id_table = vp_vdpa_id_table,
> + .probe = vp_vdpa_probe,
> + .remove = vp_vdpa_remove,
> +};
> +
> +module_pci_driver(vp_vdpa_driver);
> +
> +MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
> +MODULE_DESCRIPTION("vp-vdpa");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1");
> --
> 2.20.1

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