On 9/25/23 06:15, Cindy Lu wrote:> On Tue, Sep 12, 2023 at 3:39?PM Jason Wang <jasowang at redhat.com>
wrote:
>>
>> On Tue, Sep 12, 2023 at 11:00?AM Cindy Lu <lulu at redhat.com>
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 at redhat.com>
>>> ---
>>> 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
>>>
>>
>