Re: VDPA Debug/Statistics

[Jason Wang]

On 2020/8/11 下午7:58, Eli Cohen wrote:
> On Tue, Aug 11, 2020 at 11:26:20AM +0000, Eli Cohen wrote:
> > Hi All
> >
> > Currently, the only statistics we get for a VDPA instance comes from the virtio_net device instance. Since VDPA involves hardware acceleration, there can be quite a lot of information that can be fetched from the underlying device. Currently there is no generic method to fetch this information.
> >
> > One way of doing this can be to create a the host, a net device for
> > each VDPA instance, and use it to get this information or do some
> > configuration. Ethtool can be used in such a case


The problems are:

- vDPA is not net specific
- vDPA should be transparent to host networking stack


> > I would like to hear what you think about this or maybe you have some other ideas to address this topic.
> >
> > Thanks,
> > Eli
> Something I'm not sure I understand is how are vdpa instances created on mellanox cards? There's a devlink command for that, is that right?
> Can that be extended for stats?
>
> Currently any VF will be probed as VDPA device. We're adding devlink support but I am not sure if devlink is suitable for displaying statistics. We will discuss internally but I wanted to know why you guys think.


I agree with Michael, if it's possible, integrating stats with devlink 
should be the best. Having another interface with is just for stats 
looks not good.

Thanks


> --
> MST