netdev - Re: [PATCH net-next 1/2] mlxsw: Register physical ports as a devlink resource

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Date:   Wed, 13 Jan 2021 10:32:41 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jiri@...dia.com,
        danieller@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH net-next 1/2] mlxsw: Register physical ports as a devlink
 resource

On Tue, Jan 12, 2021 at 08:21:22PM -0800, Jakub Kicinski wrote:
> On Tue, 12 Jan 2021 10:39:30 +0200 Ido Schimmel wrote:
> > From: Danielle Ratson <danieller@...dia.com>
> > 
> > The switch ASIC has a limited capacity of physical ('flavour physical'
> > in devlink terminology) ports that it can support. While each system is
> > brought up with a different number of ports, this number can be
> > increased via splitting up to the ASIC's limit.
> > 
> > Expose physical ports as a devlink resource so that user space will have
> > visibility to the maximum number of ports that can be supported and the
> > current occupancy.
> 
> Any thoughts on making this a "generic" resource?

It might be possible to allow drivers to pass the maximum number of
physical ports to devlink during their initialization. Devlink can then
use it as an indication to register the resource itself instead of the
driver. It can report the current occupancy without driver intervention
since the list of ports is maintained in devlink.

There might be an issue with the resource identifier which is a 64-bit
number passed from drivers. I think we can partition this to identifiers
allocated by devlink / drivers.

Danielle / Jiri?