Linux Virtualization - Jul 2020 - [PATCH vhost next 06/10] vdpa: Add means to communicate vq status on get_vq_state

On 2020/7/16 ??4:21, Eli Cohen wrote:
> On Thu, Jul 16, 2020 at 04:11:00PM +0800, Jason Wang wrote:
>> On 2020/7/16 ??3:23, Eli Cohen wrote:
>>> Currently, get_vq_state() is used only to pass the available index
value
>>> of a vq. Extend the struct to return status on the VQ to the
caller.
>>> For now, define VQ_STATE_NOT_READY. In the future it will be
extended to
>>> include other infomration.
>>>
>>> Modify current vdpa driver to update this field.
>>>
>>> Reviewed-by: Parav Pandit<parav at mellanox.com>
>>> Signed-off-by: Eli Cohen<eli at mellanox.com>
>> What's the difference between this and get_vq_ready()?
>>
>> Thanks
>>
> There is no difference. It is just a way to communicate a problem to
> with the state of the VQ back to the caller. This is not available now.
> I think an asynchronous is preferred but that is not available
> currently.

I still don't see the reason, maybe you can give me an example?

Thanks