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

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Message-ID: <YnploMZRI9jXMXAi@unreal>
Date:   Tue, 10 May 2022 16:16:16 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Yishai Hadas <yishaih@...dia.com>, alex.williamson@...hat.com
Cc:     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 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

Thanks