netdev - Re: [RFC net-next 0/5] TSN: Add qdisc-based config interfaces for traffic shapers

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Date:   Fri, 1 Sep 2017 15:03:11 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, intel-wired-lan@...ts.osuosl.org,
        andre.guedes@...el.com, ivan.briano@...el.com,
        jesus.sanchez-palencia@...el.com, boon.leong.ong@...el.com
Subject: Re: [RFC net-next 0/5] TSN: Add qdisc-based config interfaces for
 traffic shapers


I happy to see this posted.  At first glance, it seems like a step in
the right direction.

On Thu, Aug 31, 2017 at 06:26:20PM -0700, Vinicius Costa Gomes wrote:
>  * Time-aware shaper (802.1Qbv):
...
>    S 0x01 300
>    S 0x03 500
> 
>    This means that there are two intervals, the first will have the gate
>    for traffic class 0 open for 300 nanoseconds, the second will have
>    both traffic classes open for 500 nanoseconds.

The i210 doesn't support this in HW, or does it?

>  * Frame Preemption (802.1Qbu):
> 
>    To control even further the latency, it may prove useful to signal which
>    traffic classes are marked as preemptable. For that, 'taprio' provides the
>    preemption command so you set each traffic class as preemptable or not:
> 
>    $ tc qdisc (...) \
>         preemption 0 1 1 1

Neither can the i210 preempt frames, or what am I missing?

The timing of this RFC is good, as I am just finishing up an RFC that
implements time-based transmit using the i210.  I'll try and get that
out ASAP.

Thanks,
Richard