netdev - Re: [PATCH V2 mlx5-next 0/4] Improve mlx5 live migration driver

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Date:   Thu, 12 May 2022 12:21:30 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Yishai Hadas <yishaih@...dia.com>, jgg@...dia.com,
        saeedm@...dia.com, kvm@...r.kernel.org, netdev@...r.kernel.org,
        kuba@...nel.org, maorg@...dia.com, cohuck@...hat.com
Subject: Re: [PATCH V2 mlx5-next 0/4] Improve mlx5 live migration driver

On Wed, 11 May 2022 09:40:37 +0300
Leon Romanovsky <leon@...nel.org> wrote:

> On Tue, May 10, 2022 at 09:00:53AM -0600, Alex Williamson wrote:
> > On Tue, 10 May 2022 16:16:16 +0300
> > Leon Romanovsky <leon@...nel.org> wrote:
> >   
> > > On Tue, May 10, 2022 at 12:02:02PM +0300, Yishai Hadas wrote:  
> > > > This series improves mlx5 live migration driver in few aspects as of
> > > > below.
> > > > 
> > > > Refactor to enable running migration commands in parallel over the PF
> > > > command interface.
> > > > 
> > > > To achieve that we exposed from mlx5_core an API to let the VF be
> > > > notified before that the PF command interface goes down/up. (e.g. PF
> > > > reload upon health recovery).
> > > > 
> > > > Once having the above functionality in place mlx5 vfio doesn't need any
> > > > more to obtain the global PF lock upon using the command interface but
> > > > can rely on the above mechanism to be in sync with the PF.
> > > > 
> > > > This can enable parallel VFs migration over the PF command interface
> > > > from kernel driver point of view.
> > > > 
> > > > In addition,
> > > > Moved to use the PF async command mode for the SAVE state command.
> > > > This enables returning earlier to user space upon issuing successfully
> > > > the command and improve latency by let things run in parallel.
> > > > 
> > > > Alex, as this series touches mlx5_core we may need to send this in a
> > > > pull request format to VFIO to avoid conflicts before acceptance.    
> > > 
> > > The PR was sent.
> > > https://lore.kernel.org/netdev/20220510131236.1039430-1-leon@kernel.org/T/#u  
> > 
> > For patches 2-4, please add:
> > 
> > Reviewed-by: Alex Williamson <alex.williamson@...hat.com>  
> 
> Done, I force pushed same branch and tag, so previous PR is still valid
> to be pulled.
> https://lore.kernel.org/kvm/20220510131236.1039430-1-leon@kernel.org/T/#u

Merged to vfio next branch for v5.19.  Thanks,

Alex