linux-kernel - Re: [Intel-wired-lan] [PATCH v3 net-next 00/10] Improve the taprio qdisc's relationship with its children

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Date:   Thu, 03 Aug 2023 12:04:32 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Jiri Pirko <jiri@...nulli.us>,
        Pedro Tammela <pctammela@...atatu.com>,
        Richard Cochran <richardcochran@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        intel-wired-lan@...ts.osuosl.org,
        Maxim Georgiev <glipus@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Peilin Ye <yepeilin.cs@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH v3 net-next 00/10] Improve the taprio
 qdisc's relationship with its children

Hi,

On Tue, 2023-08-01 at 21:24 +0300, Vladimir Oltean wrote:
> Changes in v3:
> Fix ptp_mock compilation as module, fix small mistakes in selftests.
> 
> Changes in v2:
> It was requested to add test cases for the taprio software and offload modes.
> Those are patches 08 and 09.
> 
> That implies adding taprio offload support to netdevsim, which is patch 07.
> 
> In turn, that implies adding a PHC driver for netdevsim, which is patch 06.
> 
> v1 at:
> https://lore.kernel.org/lkml/20230531173928.1942027-1-vladimir.oltean@nxp.com/
> 
> Original message:
> 
> Prompted by Vinicius' request to consolidate some child Qdisc
> dereferences in taprio:
> https://lore.kernel.org/netdev/87edmxv7x2.fsf@intel.com/
> 
> I remembered that I had left some unfinished work in this Qdisc, namely
> commit af7b29b1deaa ("Revert "net/sched: taprio: make qdisc_leaf() see
> the per-netdev-queue pfifo child qdiscs"").
> 
> This patch set represents another stab at, essentially, what's in the
> title. Not only does taprio not properly detect when it's grafted as a
> non-root qdisc, but it also returns incorrect per-class stats.
> Eventually, Vinicius' request is addressed too, although in a different
> form than the one he requested (which was purely cosmetic).
> 
> Review from people more experienced with Qdiscs than me would be
> appreciated. I tried my best to explain what I consider to be problems.
> I am deliberately targeting net-next because the changes are too
> invasive for net - they were reverted from stable once already.

The series LGTM, modulo the minor comments from Kurt on patch 6/10. I
agree they can be handled with follow-up patches.

Keeping it a little longer on PW: it would be great if someone from the
tc crew could have a look!

Thanks!

Paolo