linux-kernel - RE: VDPA Debug/Statistics

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Message-ID: <BN8PR12MB34259F2AE1FDAF2D40E48C5BAB450@BN8PR12MB3425.namprd12.prod.outlook.com>
Date:   Tue, 11 Aug 2020 11:58:23 +0000
From:   Eli Cohen <elic@...dia.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
CC:     Jason Wang <jasowang@...hat.com>,
        "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 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
> 
> 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.

--
MST