netdev - Re: [PATCH V2 mlx5-next 12/14] vfio/mlx5: Implement vfio

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Message-ID: <20211026121353.GP2744544@nvidia.com>
Date:   Tue, 26 Oct 2021 09:13:53 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Dr. David Alan Gilbert" <dgilbert@...hat.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Yishai Hadas <yishaih@...dia.com>, bhelgaas@...gle.com,
        saeedm@...dia.com, linux-pci@...r.kernel.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, kuba@...nel.org, leonro@...dia.com,
        kwankhede@...dia.com, mgurtovoy@...dia.com, maorg@...dia.com,
        Cornelia Huck <cohuck@...hat.com>
Subject: Re: [PATCH V2 mlx5-next 12/14] vfio/mlx5: Implement vfio_pci driver
 for mlx5 devices

On Tue, Oct 26, 2021 at 09:40:34AM +0100, Dr. David Alan Gilbert wrote:
> * Jason Gunthorpe (jgg@...dia.com) wrote:
> > On Mon, Oct 25, 2021 at 07:47:29PM +0100, Dr. David Alan Gilbert wrote:
> > 
> > > It may need some further refinement; for example in that quiesed state
> > > do counters still tick? will a NIC still respond to packets that don't
> > > get forwarded to the host?
> > 
> > At least for the mlx5 NIC the two states are 'able to issue outbound
> > DMA' and 'all internal memories and state are frozen and unchanging'.
> 
> Yeh, so my point was just that if you're adding a new state to this
> process, you need to define the details like that.

We are not planning to propose any patches/uAPI specification for this
problem until after the mlx5 vfio driver is merged..

Jason