[PATCH iproute2-next] tc: qdisc: provide tcm_handle and tcm_parent to kernel dump requests

[PATCH iproute2-next] tc: qdisc: provide tcm_handle and tcm_parent to kernel dump requests

[Eric Dumazet]

linux-7.2 can filter "tc qdisc show ..." on tcm_handle / tcm_parent and
reduce dump costs.

Old kernels ignore these values.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
---
 tc/tc_qdisc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
index b3c395b65c2f6b47abbcb6aa37b7dc1f080032e8..7c3e7cb36b4830bca9f2785a58b38d319ec4b563 100644
--- a/tc/tc_qdisc.c
+++ b/tc/tc_qdisc.c
@@ -408,6 +408,9 @@ static int tc_qdisc_list(int argc, char **argv)
 		argc--; argv++;
 	}
 
+	/* Recent kernels (7.2+) can filter on tcm_parent/tcm_handle */
+	req.t.tcm_parent = filter_parent;
+	req.t.tcm_handle = filter_handle;
 
 	if (d[0]) {
 		req.t.tcm_ifindex = ll_name_to_index(d);
-- 
2.54.0.545.g6539524ca2-goog

Re: [PATCH iproute2-next] tc: qdisc: provide tcm_handle and tcm_parent to kernel dump requests

[Jamal Hadi Salim]

On Sun, May 3, 2026 at 7:51 AM Eric Dumazet <edumazet@google.com> wrote:
>
> linux-7.2 can filter "tc qdisc show ..." on tcm_handle / tcm_parent and
> reduce dump costs.
>
> Old kernels ignore these values.
>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Cc: Jamal Hadi Salim <jhs@mojatatu.com>

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

cheers,
jamal
> ---
>  tc/tc_qdisc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
> index b3c395b65c2f6b47abbcb6aa37b7dc1f080032e8..7c3e7cb36b4830bca9f2785a58b38d319ec4b563 100644
> --- a/tc/tc_qdisc.c
> +++ b/tc/tc_qdisc.c
> @@ -408,6 +408,9 @@ static int tc_qdisc_list(int argc, char **argv)
>                 argc--; argv++;
>         }
>
> +       /* Recent kernels (7.2+) can filter on tcm_parent/tcm_handle */
> +       req.t.tcm_parent = filter_parent;
> +       req.t.tcm_handle = filter_handle;
>
>         if (d[0]) {
>                 req.t.tcm_ifindex = ll_name_to_index(d);
> --
> 2.54.0.545.g6539524ca2-goog
>

Re: [PATCH iproute2-next] tc: qdisc: provide tcm_handle and tcm_parent to kernel dump requests

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to iproute2/iproute2-next.git (main)
by David Ahern <dsahern@kernel.org>:

On Sun,  3 May 2026 11:51:37 +0000 you wrote:
> linux-7.2 can filter "tc qdisc show ..." on tcm_handle / tcm_parent and
> reduce dump costs.
> 
> Old kernels ignore these values.
> 
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Cc: Jamal Hadi Salim <jhs@mojatatu.com>
> 
> [...]

Here is the summary with links:
  - [iproute2-next] tc: qdisc: provide tcm_handle and tcm_parent to kernel dump requests
    https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/commit/?id=0fbce40d480f

You are awesome, thank you!
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