netdev - Re: [PATCH net-next RFC 00/20] Introducing P4TC

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Message-ID: <CAM0EoMkqhODxc=_J41=UxEnf5jKGXnQT5TVc8TjOMzYRr2Myjw@mail.gmail.com>
Date:   Tue, 31 Jan 2023 17:50:04 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     John Fastabend <john.fastabend@...il.com>,
        "Singhai, Anjali" <anjali.singhai@...el.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jamal Hadi Salim <hadi@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Willem de Bruijn <willemb@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel@...atatu.com" <kernel@...atatu.com>,
        "Chatterjee, Deb" <deb.chatterjee@...el.com>,
        "Limaye, Namrata" <namrata.limaye@...el.com>,
        "khalidm@...dia.com" <khalidm@...dia.com>,
        "tom@...anda.io" <tom@...anda.io>,
        "pratyush@...anda.io" <pratyush@...anda.io>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "vladbu@...dia.com" <vladbu@...dia.com>,
        "simon.horman@...igine.com" <simon.horman@...igine.com>,
        "stefanc@...vell.com" <stefanc@...vell.com>,
        "seong.kim@....com" <seong.kim@....com>,
        "mattyk@...dia.com" <mattyk@...dia.com>,
        "Daly, Dan" <dan.daly@...el.com>,
        "Fingerhut, John Andy" <john.andy.fingerhut@...el.com>
Subject: Re: [PATCH net-next RFC 00/20] Introducing P4TC

On Tue, Jan 31, 2023 at 5:36 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 31 Jan 2023 17:32:52 -0500 Jamal Hadi Salim wrote:
> > > > Sorry didnt finish my thought here, wanted to say: The loading of the
> > > > P4 binary over devlink drew (to some people) suspicion it is going to
> > > > be used for loading kernel bypass.
> > >
> > > The only practical use case I heard was the IPU. Worrying about devlink
> > > programming being a bypass on an IPU is like rearranging chairs on the
> > > Titanic.
> >
> > BTW, I do believe FNICs are heading in that direction as well.
> > I didnt quiet follow the titanic chairs analogy, can you elaborate on
> > that statement?
>
> https://en.wiktionary.org/wiki/rearrange_the_deck_chairs_on_the_Titanic

LoL. Lets convince Jiri then.
On programming devlink for the runtime I would respectfully disagree
that it is the right interface.

cheers,
jamal