netdev - Re: [PATCH net v2 2/2] selftests/tc-testing: Check backlog stats in gso

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Message-ID: <aIQKJlbq61svuSoy@pop-os.localdomain>
Date: Fri, 25 Jul 2025 15:50:14 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: William Liu <will@...lsroot.io>
Cc: netdev@...r.kernel.org, jhs@...atatu.com, pabeni@...hat.com,
	kuba@...nel.org, jiri@...nulli.us, davem@...emloft.net,
	edumazet@...gle.com, horms@...nel.org, savy@...t3mfailure.io
Subject: Re: [PATCH net v2 2/2] selftests/tc-testing: Check backlog stats in
 gso_skb case

On Thu, Jul 24, 2025 at 04:55:53PM +0000, William Liu wrote:
> diff --git a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
> index c6db7fa94f55..867654a31a95 100644
> --- a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
> +++ b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
> @@ -185,6 +185,207 @@
>              "$IP addr del 10.10.10.10/24 dev $DUMMY || true"
>          ]
>      },
> +    {
> +        "id": "34c0",
> +        "name": "Test TBF with HHF Backlog Accounting in gso_skb case",
> +        "category": [
> +            "qdisc",
> +            "tbf",
> +            "hhf"
> +        ],
> +        "plugins": {
> +            "requires": [
> +                "nsPlugin",
> +                "scapyPlugin"

scapyPlugin is not required unless you generate traffic with scapy
instead of ping.


> +            ]
> +        },
> +        "setup": [
> +            "$IP link set dev $DUMMY up || true",
> +            "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
> +            "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
> +            "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 hhf limit 1000",
> +            [
> +                "ping -I $DUMMY  -f -c8 -s32 -W0.001 10.10.11.11",
> +                1

What is this magic number here? :)


Thanks.