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Date:   Wed, 9 Dec 2020 09:48:53 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Erez Geva <erez.geva.ext@...mens.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Arnd Bergmann <arnd@...db.de>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Alexei Starovoitov <ast@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Eyal Birger <eyal.birger@...il.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Jakub Sitnicki <jakub@...udflare.com>,
        John Ogness <john.ogness@...utronix.de>,
        Jon Rosen <jrosen@...co.com>,
        Kees Cook <keescook@...omium.org>,
        Mao Wenan <maowenan@...wei.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Martin KaFai Lau <kafai@...com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Or Cohen <orcohen@...oaltonetworks.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Cochran <richardcochran@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Xie He <xie.he.0141@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vladis Dronov <vdronov@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Vedang Patel <vedang.patel@...el.com>,
        Ines Molzahn <ines.molzahn@...mens.com>,
        Simon Sudler <simon.sudler@...mens.com>,
        Andreas Meisinger <andreas.meisinger@...mens.com>,
        Andreas Bucher <andreas.bucher@...mens.com>,
        Henning Schild <henning.schild@...mens.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Andreas Zirkler <andreas.zirkler@...mens.com>,
        Ermin Sakic <ermin.sakic@...mens.com>,
        An Ninh Nguyen <anninh.nguyen@...mens.com>,
        Michael Saenger <michael.saenger@...mens.com>,
        Bernd Maehringer <bernd.maehringer@...mens.com>,
        Gisela Greinert <gisela.greinert@...mens.com>,
        Erez Geva <ErezGeva2@...il.com>
Subject: Re: [PATCH 1/3] Add TX sending hardware timestamp.

On Wed, Dec 9, 2020 at 9:37 AM Erez Geva <erez.geva.ext@...mens.com> wrote:
>
> Configure and send TX sending hardware timestamp from
>  user space application to the socket layer,
>  to provide to the TC ETC Qdisc, and pass it to
>  the interface network driver.
>
>  - New flag for the SO_TXTIME socket option.
>  - New access auxiliary data header to pass the
>    TX sending hardware timestamp.
>  - Add the hardware timestamp to the socket cookie.
>  - Copy the TX sending hardware timestamp to the socket cookie.
>
> Signed-off-by: Erez Geva <erez.geva.ext@...mens.com>

Hardware offload of pacing is definitely useful.

I don't think this needs a new separate h/w variant of SO_TXTIME.

Indeed, we want pacing offload to work for existing applications.

It only requires that pacing qdiscs, both sch_etf and sch_fq,
optionally skip queuing in their .enqueue callback and instead allow
the skb to pass to the device driver as is, with skb->tstamp set. Only
to devices that advertise support for h/w pacing offload.

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