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Date: Wed, 12 Aug 2020 10:09:22 +0800 From: Jason Wang <jasowang@...hat.com> To: Eli Cohen <elic@...dia.com>, "Michael S. Tsirkin" <mst@...hat.com> Cc: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "eli@...lanox.com" <eli@...lanox.com>, "lulu@...hat.com" <lulu@...hat.com>, Majd Dibbiny <majd@...dia.com>, Maor Dickman <maord@...dia.com>, Shahaf Shuler <shahafs@...lanox.com>, Parav Pandit <parav@...lanox.com> Subject: Re: VDPA Debug/Statistics 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 >
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