[dpdk-dev] [PATCH] [RFC] vhost: inroduce operation to get vDPA queue stats

[Matan Azrad]

Hi Maxime

From: Maxime Coquelin
> Hi Matan,
> 
> On 3/16/20 4:12 PM, Matan Azrad wrote:
> > The vDPA device offloads all the datapath of the vhost device to the
> > HW device.
> >
> > In order to expose to the user traffic information this patch
> > introduce new API to get traffic statistics per virtio queue.
> >
> > The statistics are taken directly from the vDPA driver managing the HW
> > device.
> 
> Shouldn't the stats be collected from the PF like for "legacy" SR-IOV via the
> sysfs?
> Something like:
> /sys/class/net/<PF name>/device/sriov/<VF ID>/stats/

Yes, probably, statistics can be taken from sysfs.

But we are introducing a DPDK API to get the virtio statistics.
So, driver which can take statistics from there can take them from sysfs in the driver operation.  

In addition, the API includes per virtio queue statistics and in virtio data-path terms, it is very helpful for debuggability. 


> Regards,
> Maxime