netdev - Re: [RFC] net: core: devlink: add port_params_ops for devlink port parameters altering

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Date:   Fri, 9 Apr 2021 11:37:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        netdev@...r.kernel.org, jiri@...dia.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, idosch@...sch.org,
        Parav Pandit <parav@...dia.com>
Subject: Re: [RFC] net: core: devlink: add port_params_ops for devlink port
 parameters altering

On Fri, 9 Apr 2021 20:01:14 +0300 Vadym Kochan wrote:
> On Fri, Apr 09, 2021 at 09:51:13AM -0700, Samudrala, Sridhar wrote:
> > On 4/9/2021 9:22 AM, Oleksandr Mazur wrote:  
> > > I'd like to discuss a possibility of handling devlink port parameters
> > > with devlink port pointer supplied.
> > > 
> > > Current design makes it impossible to distinguish which port's parameter
> > > should get altered (set) or retrieved (get) whenever there's a single
> > > parameter registered within a few ports.  
> > 
> > I also noticed this issue recently when trying to add port parameters and
> > I have a patch that handles this in a different way. The ops in devlink_param
> > struct can be updated to include port_index as an argument
> 
> We were thinking on this direction but rather decided to have more strict
> cb signature which reflects that we are working with devlink_port only.

+1 for passing the actual pointer