linux-kernel - Re: [PATCH 5/6] vdpa: introduce virtio pci driver

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Date:   Tue, 2 Jun 2020 01:08:03 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        rob.miller@...adcom.com, lingshan.zhu@...el.com,
        eperezma@...hat.com, lulu@...hat.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com,
        zhangweining@...jie.com.cn, eli@...lanox.com
Subject: Re: [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@...hat.com>");
> +MODULE_DESCRIPTION("vp-vdpa");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("1");
> -- 
> 2.20.1