netdev - Re: [RFC 4/4] vduse: update the vq

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Date:   Wed, 28 Jun 2023 16:13:14 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     mst@...hat.com, maxime.coquelin@...hat.com,
        xieyongji@...edance.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC 4/4] vduse: update the vq_info in ioctl

On Wed, Jun 28, 2023 at 3:00 PM Cindy Lu <lulu@...hat.com> wrote:
>
> From: Your Name <you@...mple.com>
>
> in VDUSE_VQ_GET_INFO, driver will sync the last_avail_idx
> with reconnect info, I have olny test the split mode, so

Typo, should be "only".

> only use this here, will add more information later
>
> Signed-off-by: Cindy Lu <lulu@...hat.com>
> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 3df1256eccb4..b8e453eac0ce 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -141,6 +141,11 @@ static u32 allowed_device_id[] = {
>         VIRTIO_ID_NET,
>  };
>
> +struct vhost_reconnect_vring {
> +       uint16_t last_avail_idx;
> +       bool avail_wrap_counter;
> +};

Should this belong to uAPI?

> +
>  static inline struct vduse_dev *vdpa_to_vduse(struct vdpa_device *vdpa)
>  {
>         struct vduse_vdpa *vdev = container_of(vdpa, struct vduse_vdpa, vdpa);
> @@ -1176,6 +1181,17 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
>                                 vq->state.split.avail_index;
>
>                 vq_info.ready = vq->ready;
> +               struct vdpa_reconnect_info *area;
> +
> +               area = &dev->reconnect_info[index];
> +               struct vhost_reconnect_vring *log_reconnect;
> +
> +               log_reconnect = (struct vhost_reconnect_vring *)area->vaddr;

What if userspace doesn't do mmap()?

Thanks

> +               if (log_reconnect->last_avail_idx !=
> +                   vq_info.split.avail_index) {
> +                       vq_info.split.avail_index =
> +                               log_reconnect->last_avail_idx;
> +               }
>
>                 ret = -EFAULT;
>                 if (copy_to_user(argp, &vq_info, sizeof(vq_info)))
> --
> 2.34.3
>