linux-kernel - 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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Date:   Wed, 14 Jun 2023 13:45:42 -0300
From:   Pedro Tammela <pctammela@...atatu.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     "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 13/06/2023 18:54, Vladimir Oltean wrote:
> The reason behind commit af7b29b1deaa ("Revert "net/sched: taprio: make
> qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"") was that the
> patch it reverted caused a crash when attaching a CBS shaper to one of
> the taprio classes. Prevent that from happening again by adding a test
> case for it, which now passes correctly in both offload and software
> modes.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Other than the comment below,

Reviewed-by: Pedro Tammela <pctammela@...atatu.com>

> ---
> v1->v2: patch is new
> 
>   .../tc-testing/tc-tests/qdiscs/taprio.json    | 50 +++++++++++++++++++
>   1 file changed, 50 insertions(+)
> 
> diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/taprio.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/taprio.json
> index 58d4d97f4499..47692335bcf1 100644
> --- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/taprio.json
> +++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/taprio.json
> @@ -179,5 +179,55 @@
>               "$TC qdisc del dev $ETH root",
>               "echo \"1\" > /sys/bus/netdevsim/del_device"
>           ]
> +    },
> +    {
> +        "id": "a7bf",
> +        "name": "Graft cbs as child of software taprio",
> +        "category": [
> +            "qdisc",
> +            "taprio",
> +            "cbs"
> +        ],
> +        "plugins": {
> +            "requires": "nsPlugin"
> +        },
> +        "setup": [
> +            "echo \"1 1 8\" > /sys/bus/netdevsim/new_device",
> +            "$TC qdisc replace dev $ETH handle 8001: parent root stab overhead 24 taprio num_tc 8 map 0 1 2 3 4 5 6 7 queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 sched-entry S ff 20000000 clockid CLOCK_TAI"
> +        ],
> +        "cmdUnderTest": "$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 $ETH",
> +        "matchPattern": "qdisc cbs 8002: parent 8001:8 hicredit 30 locredit -1470 sendslope -980000 idleslope 20000 offload 0",
> +        "matchCount": "1",
> +        "teardown": [
> +            "$TC qdisc del dev $ETH root",
> +            "echo \"1\" > /sys/bus/netdevsim/del_device"
> +        ]
> +    },
> +    {
> +        "id": "6a83",
> +        "name": "Graft cbs as child of offloaded taprio",
> +        "category": [
> +            "qdisc",
> +            "taprio",
> +            "cbs"
> +        ],
> +        "plugins": {
> +            "requires": "nsPlugin"
> +        },
> +        "setup": [
> +            "echo \"1 1 8\" > /sys/bus/netdevsim/new_device",
> +            "$TC qdisc replace dev $ETH handle 8001: parent root stab overhead 24 taprio num_tc 8 map 0 1 2 3 4 5 6 7 queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 sched-entry S ff 20000000 flags 0x2"
> +        ],
> +        "cmdUnderTest": "$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

> +        "matchCount": "1",
> +        "teardown": [
> +            "$TC qdisc del dev $ETH root",
> +            "echo \"1\" > /sys/bus/netdevsim/del_device"
> +        ]
>       }
>   ]