netdev - Re: [PATCH v3 net-next 09/10] selftests/tc-testing: test that taprio can only be attached as root

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Date: Mon, 7 Aug 2023 22:06:02 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc: 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>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
	Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
	Peilin Ye <yepeilin.cs@...il.com>,
	Pedro Tammela <pctammela@...atatu.com>,
	Richard Cochran <richardcochran@...il.com>,
	Zhengchao Shao <shaozhengchao@...wei.com>,
	Maxim Georgiev <glipus@...il.com>
Subject: Re: [PATCH v3 net-next 09/10] selftests/tc-testing: test that taprio
 can only be attached as root

On Thu, Aug 03, 2023 at 11:43:16AM -0700, Vinicius Costa Gomes wrote:
> Hmmm, I think that this test discovered another bug (perhaps even two).
> When it fails here's the json I get (edited for clarity):
> 
> [{"kind":"taprio","handle":"8001:","root":true,"refcnt":9,
>   "options":{
>         "tc":0,
>         "map":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
>         "queues":[],
>         "clockid":"TAI",
>         "base_time":0,
>         "cycle_time":0,
>         "cycle_time_extension":0,
>         {
>                 "base_time":0,
>                 "cycle_time":20000000,
>                 "cycle_time_extension":0,
>                 "schedule":[{"index":0,"cmd":"S","gatemask":"0xff","interval":20000000}]
>         }}}]
> 
> Thinking out loud: If I am reading this right, there's no "oper"
> schedule, only an "admin" schedule. So the first bug is probably a
> taprio bug when deciding if it should create an "open" vs. "admin"
> schedule.
> 
> The second bug seems to be in the way that q_taprio in iproute2
> handles the admin schedule, is just an object inside another, which
> seems to be invalid.
> 
> Does it make sense?

Yes, it makes sense, thanks. I've sent some iproute2 patches that fix
the user space issues, and I'll soon send a v4 which takes into
consideration the fact that the admin schedule may not become
operational right away.
https://patchwork.kernel.org/project/netdevbpf/patch/20230807160827.4087483-1-vladimir.oltean@nxp.com/