Re: [PATCH net] selftests: tc-testing: use $IP in hfsc test 8c39 setup

[Hangbin Liu <hangbin.liu@linux.dev>]

On Wed, Oct 14, 2026 at 02:14:12PM +0200, Ivan Vecera wrote:
> Test 8c39 brings up lo with a bare "ip" command. nsPlugin runs it as
> "$IP netns exec <ns> ip ...", and as tdc runs commands with an empty
> environment, "ip netns exec" searches only the default execvp() path
> (/bin:/usr/bin). On systems that install ip only in /sbin, like Fedora,
> the setup fails:
> 
>   # ./tdc.py -e 8c39
>   Test 8c39: HFSC classify walk still reaches leaf after lateral drift
>   -----> prepare stage *** Could not execute: "ip link set lo up"
>   -----> prepare stage *** Error message: "exec of "ip" failed: No such file or directory
> 
> Use $IP like all other tdc tests do.
> 
> Fixes: 1e24c4f2ee44 ("selftests: tc-testing: add a lateral-drift hfsc classify-walk test")
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
> ---
>  tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> index 4f6bbb8b57f9..557730eef055 100644
> --- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> +++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/hfsc.json
> @@ -181,7 +181,7 @@
>              "requires": "nsPlugin"
>          },
>          "setup": [
> -            "ip link set lo up",
> +            "$IP link set lo up",
>              "$TC qdisc add dev lo handle 1: root hfsc default 30",
>              "$TC class add dev lo parent 1: classid 1:1 hfsc rt m2 100kbit",
>              "$TC class add dev lo parent 1:1 classid 1:10 hfsc rt m2 50kbit",
> -- 
> 2.56.0
> 

Reviewed-by: Hangbin Liu <liuhangbin@kylinos.cn>