Re: [RFC v2 3/4] vduse: update the vq_info in ioctl

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On 9/25/23 06:15, Cindy Lu wrote:
On Tue, Sep 12, 2023 at 3:39 PM Jason Wang <jasowang@xxxxxxxxxx> wrote:

On Tue, Sep 12, 2023 at 11:00 AM Cindy Lu <lulu@xxxxxxxxxx> wrote:

In VDUSE_VQ_GET_INFO, the driver will sync the last_avail_idx
with reconnect info, After mapping the reconnect pages to userspace
The userspace App will update the reconnect_time in
struct vhost_reconnect_vring, If this is not 0 then it means this
vq is reconnected and will update the last_avail_idx

Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx>
---
  drivers/vdpa/vdpa_user/vduse_dev.c | 13 +++++++++++++
  include/uapi/linux/vduse.h         |  6 ++++++
  2 files changed, 19 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 2c69f4004a6e..680b23dbdde2 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1221,6 +1221,8 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
                 struct vduse_vq_info vq_info;
                 struct vduse_virtqueue *vq;
                 u32 index;
+               struct vdpa_reconnect_info *area;
+               struct vhost_reconnect_vring *vq_reconnect;

                 ret = -EFAULT;
                 if (copy_from_user(&vq_info, argp, sizeof(vq_info)))
@@ -1252,6 +1254,17 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,

                 vq_info.ready = vq->ready;

+               area = &vq->reconnect_info;
+
+               vq_reconnect = (struct vhost_reconnect_vring *)area->vaddr;
+               /*check if the vq is reconnect, if yes then update the last_avail_idx*/
+               if ((vq_reconnect->last_avail_idx !=
+                    vq_info.split.avail_index) &&
+                   (vq_reconnect->reconnect_time != 0)) {
+                       vq_info.split.avail_index =
+                               vq_reconnect->last_avail_idx;
+               }
+
                 ret = -EFAULT;
                 if (copy_to_user(argp, &vq_info, sizeof(vq_info)))
                         break;
diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h
index 11bd48c72c6c..d585425803fd 100644
--- a/include/uapi/linux/vduse.h
+++ b/include/uapi/linux/vduse.h
@@ -350,4 +350,10 @@ struct vduse_dev_response {
         };
  };

+struct vhost_reconnect_vring {
+       __u16 reconnect_time;
+       __u16 last_avail_idx;
+       _Bool avail_wrap_counter;

Please add a comment for each field.

Sure will do

And I never saw _Bool is used in uapi before, maybe it's better to
pack it with last_avail_idx into a __u32.

Thanks will fix this
Btw, do we need to track inflight descriptors as well?

I will check this

For existing networking implemenation, this is not necessary.
But it should be for block devices.

Maxime

Thanks

cindy
Thanks

+};
+
  #endif /* _UAPI_VDUSE_H_ */
--
2.34.3







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