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

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Message-ID: <20221205161933.663ea611@kernel.org>
Date:   Mon, 5 Dec 2022 16:19:33 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jiri Pirko <jiri@...nulli.us>
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

On Mon, 5 Dec 2022 11:32:04 +0100 Jiri Pirko wrote:
> >> 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?

Yeah, that's a slightly tricky one. We'd probably need some form 
of second order association. Easiest if we link it to a devlink
instance, I reckon. The OCP clock card does not have netdevs so we
can't follow the namespace of netdevs (which would be the second
option).