netdev - Re: [PATCH net-next 04/13] net/sched: taprio: allow user input of per-tc max SDU

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Date:   Wed, 14 Sep 2022 16:17:16 -0700
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Rui Sousa <rui.sousa@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Walle <michael@...le.cc>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Colin Foster <colin.foster@...advantage.com>,
        Richie Pearn <richard.pearn@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Vladimir Oltean <olteanv@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 04/13] net/sched: taprio: allow user input of
 per-tc max SDU

Vladimir Oltean <vladimir.oltean@....com> writes:

> On Wed, Sep 14, 2022 at 04:00:07PM -0700, Vinicius Costa Gomes wrote:
>> Hm, I just noticed something.
>> 
>> During parse the user only sets the max-sdu for the traffic classes she
>> is interested on. During dump you are showing all of them, the unset
>> ones will be shown as zero, that seems a bit confusing, which could mean
>> that you would have to add some checks anyway.
>> 
>> For the offload side, you could just document that U32_MAX means unset.
>
> Yes, choosing '0' rather than other value, to mean 'default to port MTU'
> was intentional. It is also in line with what other places, like the
> YANG models, expect to see:
> https://github.com/YangModels/yang/blob/main/standard/ieee/draft/802.1/Qcw/ieee802-dot1q-sched.yang#L128

Oh, I see. My bad. So, only that comment about thinking about making the
comparison simpler is still valid.


Cheers,
-- 
Vinicius