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

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Message-ID: <20230131111020.2821ea17@kernel.org>
Date:   Tue, 31 Jan 2023 11:10:20 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jamal Hadi Salim <jhs@...atatu.com>
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, 31 Jan 2023 05:30:10 -0500 Jamal Hadi Salim wrote:
> > Note, there are two paths in P4TC:
> > DDP loading via devlink is equivalent to loading the P4 binary for the hardware.
> > That is one of the 3 (and currently most popular) driver interfaces
> > suggested. Some of that drew  
> 
> 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.