netdev - Re: [Intel-wired-lan] [RFC v2 net-next 01/10] net: Add a new socket option for a future transmit time.

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Date:   Tue, 23 Jan 2018 19:04:36 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Miroslav Lichvar <mlichvar@...hat.com>,
        Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>,
        netdev@...r.kernel.org, john.stultz@...aro.org,
        Richard Cochran <rcochran@...utronix.de>, jiri@...nulli.us,
        ivan.briano@...el.com, henrik@...tad.us, jhs@...atatu.com,
        levi.pearson@...man.com, intel-wired-lan@...ts.osuosl.org,
        xiyou.wangcong@...il.com, tglx@...utronix.de,
        anna-maria@...utronix.de
Subject: Re: [Intel-wired-lan] [RFC v2 net-next 01/10] net: Add a new socket
 option for a future transmit time.

On Tue, Jan 23, 2018 at 01:22:37PM -0800, Vinicius Costa Gomes wrote:
> What I think would be the ideal scenario would be if the clockid
> parameter to the TBS Qdisc would not be necessary (if offload was
> enabled), but that's not quite possible right now, because there's no
> support for using the hrtimer infrastructure with dynamic clocks
> (/dev/ptp*).

We don't need hrtimer for HW offloading.  Just enqueue the packets.  I
thought we agreed that user space get the ordering correct.  In fact,
davem insisted on it, IIRC.

Thanks,
Richard