netdev - Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

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Message-ID: <ZFITyWvVcqgRtN+Q@nanopsycho>
Date: Wed, 3 May 2023 09:56:57 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	Vadim Fedorenko <vadfed@...a.com>,
	Jonathan Lemon <jonathan.lemon@...il.com>,
	Paolo Abeni <pabeni@...hat.com>, poros <poros@...hat.com>,
	mschmidt <mschmidt@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	"Olech, Milena" <milena.olech@...el.com>,
	"Michalik, Michal" <michal.michalik@...el.com>
Subject: Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

Adding back the cclist stripped due to Claws bug.

Tue, May 02, 2023 at 05:32:44PM CEST, kuba@...nel.org wrote:
>On Tue, 2 May 2023 10:52:57 +0200 Jiri Pirko wrote:
>> >> Index internal within a single instance. Like Intel guys, they have 1
>> >> clock wired up with multiple DPLLs. The driver gives every DPLL index.
>> >> This is internal, totally up to the driver decision. Similar concept to
>> >> devlink port index.  
>> >
>> >devlink port index ended up as a pretty odd beast with drivers encoding
>> >various information into it, using locally grown schemes.
>> >
>> >Hard no on doing that in dpll, it should not be exposed to the user.  
>> 
>> So you say to have ID fully dynamic and non deterministic? I'm lost a
>> bit.
>
>Yup, non-deterministic, just a cyclic ID allocated by the core starting
>from 1. Finding the right device / pin needs to be done via
>informational attributes not making assumptions about the ID.

Okay.

When netdev will have pin ID in the RT netlink message (as it is done
in RFCv7), it is easy to get the pin/dpll for netdev. No problem there.

However, for non-SyncE usecase, how do you imagine scripts to work?
I mean, the script have to obtain dpll/pin ID by deterministic
module_name/clock_id/idx tuple.

There are 2 options to do that:
1) dump all dplls/pins and do lookup in userspace
2) get a dpll/pin according to given module_name/clock_id/idx tuple

The first approach is not very nice.
The currently pushed RFCv7 of the patchset does not support 2)

Now if we add support for 2), we basically use module_name/clock_id/idx
as a handle for "get cmd". My point is, why can't we use it for "set
cmd" as well and avoid the ID entirely?

What am I missing here?