Commit 4e4dc6db authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

tools: ynl: add a sample for TC 



Add a very simple TC dump sample with decoding of fq_codel attrs:

  # ./tools/net/ynl/samples/tc
        dummy0: fq_codel  limit: 10240p target: 5ms new_flow_cnt: 0

proving that selector passing (for stats) works.

Reviewed-by: default avatarDonald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250520161916.413298-13-kuba@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 33baf6f7

tools/net/ynl/samples/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -6,3 +6,4 @@ page-pool 
rt-addr

rt-link

rt-route

tc

tools/net/ynl/samples/tc.c

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+80 −0
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// SPDX-License-Identifier: GPL-2.0

#include <stdio.h>

#include <string.h>



#include <ynl.h>



#include <net/if.h>



#include "tc-user.h"



static void tc_qdisc_print(struct tc_getqdisc_rsp *q)

{

	char ifname[IF_NAMESIZE];

	const char *name;



	name = if_indextoname(q->_hdr.tcm_ifindex, ifname);

	if (name)

		printf("%16s: ", name);



	if (q->_len.kind) {

		printf("%s  ", q->kind);



		if (q->options._present.fq_codel) {

			struct tc_fq_codel_attrs *fq_codel;

			struct tc_fq_codel_xstats *stats;



			fq_codel = &q->options.fq_codel;

			stats = q->stats2.app.fq_codel;



			if (fq_codel->_present.limit)

				printf("limit: %dp ", fq_codel->limit);

			if (fq_codel->_present.target)

				printf("target: %dms ",

				       (fq_codel->target + 500) / 1000);

			if (q->stats2.app._len.fq_codel)

				printf("new_flow_cnt: %d ",

				       stats->qdisc_stats.new_flow_count);

		}

	}



	printf("\n");

}



int main(int argc, char **argv)

{

	struct tc_getqdisc_req_dump *req;

	struct tc_getqdisc_list *rsp;

	struct ynl_error yerr;

	struct ynl_sock *ys;



	ys = ynl_sock_create(&ynl_tc_family, &yerr);

	if (!ys) {

		fprintf(stderr, "YNL: %s\n", yerr.msg);

		return 1;

	}



	req = tc_getqdisc_req_dump_alloc();

	if (!req)

		goto err_destroy;



	rsp = tc_getqdisc_dump(ys, req);

	tc_getqdisc_req_dump_free(req);

	if (!rsp)

		goto err_close;



	if (ynl_dump_empty(rsp))

		fprintf(stderr, "Error: no addresses reported\n");

	ynl_dump_foreach(rsp, qdisc)

		tc_qdisc_print(qdisc);

	tc_getqdisc_list_free(rsp);



	ynl_sock_destroy(ys);

	return 0;



err_close:

	fprintf(stderr, "YNL: %s\n", ys->err.msg);

err_destroy:

	ynl_sock_destroy(ys);

	return 2;

}