netdev - Re: [PATCH v2 net-next 9/9] selftests/tc-testing: verify that a qdisc can be grafted onto a taprio class

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Message-ID: <20230801165344.3rtleamaqxr2g27k@skbuf>
Date: Tue, 1 Aug 2023 19:53:44 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Pedro Tammela <pctammela@...atatu.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>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	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>,
	Richard Cochran <richardcochran@...il.com>,
	Zhengchao Shao <shaozhengchao@...wei.com>,
	Maxim Georgiev <glipus@...il.com>
Subject: Re: [PATCH v2 net-next 9/9] selftests/tc-testing: verify that a
 qdisc can be grafted onto a taprio class

On Wed, Jun 14, 2023 at 01:45:42PM -0300, Pedro Tammela wrote:
> > +        "cmdUnderTest": "$TC qdisc replace dev $ETH handle 8002: parent 8001:8 cbs idleslope 20000 sendslope -980000 hicredit 30 locredit -1470",
> > +        "expExitCode": "0",
> > +        "verifyCmd": "$TC -d qdisc show dev $ETH",
> > +        "matchPattern": "qdisc cbs 8002: parent 8001:8 hicredit 30 locredit -1470 sendslope -980000 idleslope 20000 offload 0",
> 
> Seems like this test is missing the 'refcnt 2' in the match pattern

Makes sense. This is consistent with the idea of my patch set, which is
that in offloaded taprio mode, each child Qdisc has a refcount elevated
by the fact that it's attached to a netdev TX queue (hence the 2 here).
I had copied this expected output from the "Graft cbs as child of software
taprio" test a7bf (not sure why I didn't catch the failure), but there,
the expected refcount of child Qdiscs is 1 (and thus, not shown).