netdev - Re: [RFC PATCH v4 2/4] dpll: Add DPLL framework base functions

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Date:   Mon, 5 Dec 2022 11:32:04 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>,
        Vadim Fedorenko <vfedorenko@...ek.ru>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Vadim Fedorenko <vadfed@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        "Olech, Milena" <milena.olech@...el.com>,
        "Michalik, Michal" <michal.michalik@...el.com>
Subject: Re: [RFC PATCH v4 2/4] dpll: Add DPLL framework base functions

Sat, Dec 03, 2022 at 06:22:06AM CET, kuba@...nel.org wrote:
>On Fri, 2 Dec 2022 17:15:23 +0100 Jiri Pirko wrote:
>> >OK, I now see your point what is the confusion.
>> >Thanks for explanation.
>> >But I am still not sure how to make it this way in Linux, if interface added to
>> >netns uses original netdev ifindex, and driver after reload receives new
>> >(previously unused ifindex) what would be the steps/commands to make it as you
>> >described?
>>
>> As I said, I don't see a way to have the ifindex exposed throught dpll
>> at all.
>
>We can quite easily only report ifindexes in the same namespace
>as the socket, right?

Sure, hmm, thinkign about it more, this would be probably a good start.


>
>> I believe we should do it only the other way around. Assign
>> dpll_pin pointer to struct net_device and expose this over new attr
>> IFLA_DPLL_PIN over RT netlink.
>
>The ID table is global, what's the relationship between DPLLs
>and net namespaces? We tie DPLLs to a devlink instance which
>has a namespace? We pretend namespaces don't exist? :S

Well, if would be odd to put dpll itself into a namespace. It might not
have anything to do with networking, for example in case of ptp_ocp.
What would mean for a dpll to be in a net namespace?