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

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Date:   Fri, 9 Apr 2021 12:26:06 -0700
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     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 4/9/2021 11:37 AM, Jakub Kicinski wrote:
> 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
OK. This way we don't need to change the existing users of devlink param 
ops.