netdev - Re: [RFT net-next 0/6] devlink: expose instance locking and simplify port splitting

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Date:   Fri, 11 Mar 2022 11:48:53 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     idosch@...dia.com, petrm@...dia.com, netdev@...r.kernel.org,
        leonro@...dia.com, jiri@...nulli.us
Subject: Re: [RFT net-next 0/6] devlink: expose instance locking and simplify
 port splitting

On Wed, Mar 09, 2022 at 04:16:26PM -0800, Jakub Kicinski wrote:
> This series puts the devlink ports fully under the devlink instance
> lock's protection. As discussed in the past it implements my preferred
> solution of exposing the instance lock to the drivers. This way drivers
> which want to support port splitting can lock the devlink instance
> themselves on the probe path, and we can take that lock in the core
> on the split/unsplit paths.
> 
> nfp and mlxsw are converted, with slightly deeper changes done in
> nfp since I'm more familiar with that driver.
> 
> Now that the devlink port is protected we can pass a pointer to
> the drivers, instead of passing a port index and forcing the drivers
> to do their own lookups. Both nfp and mlxsw can container_of() to
> their own structures.
> 
> I'd appreciate some testing, I don't have access to this HW.

Thanks Jakub,

this looks like a nice improvement :)

We have exercised this patch-set on NFP-based NICs and have not observed
any regressions.