tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250520161916.413298-13-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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tools/net/ynl/samples/tc.c
+80
tools/net/ynl/samples/tc.c
···
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// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <string.h>
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#include <ynl.h>
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#include <net/if.h>
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#include "tc-user.h"
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static void tc_qdisc_print(struct tc_getqdisc_rsp *q)
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{
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char ifname[IF_NAMESIZE];
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const char *name;
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name = if_indextoname(q->_hdr.tcm_ifindex, ifname);
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if (name)
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printf("%16s: ", name);
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if (q->_len.kind) {
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printf("%s ", q->kind);
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if (q->options._present.fq_codel) {
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struct tc_fq_codel_attrs *fq_codel;
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struct tc_fq_codel_xstats *stats;
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fq_codel = &q->options.fq_codel;
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stats = q->stats2.app.fq_codel;
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if (fq_codel->_present.limit)
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printf("limit: %dp ", fq_codel->limit);
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if (fq_codel->_present.target)
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printf("target: %dms ",
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(fq_codel->target + 500) / 1000);
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if (q->stats2.app._len.fq_codel)
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printf("new_flow_cnt: %d ",
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stats->qdisc_stats.new_flow_count);
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}
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}
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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struct tc_getqdisc_req_dump *req;
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struct tc_getqdisc_list *rsp;
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struct ynl_error yerr;
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struct ynl_sock *ys;
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ys = ynl_sock_create(&ynl_tc_family, &yerr);
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if (!ys) {
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fprintf(stderr, "YNL: %s\n", yerr.msg);
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return 1;
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}
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req = tc_getqdisc_req_dump_alloc();
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if (!req)
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goto err_destroy;
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rsp = tc_getqdisc_dump(ys, req);
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tc_getqdisc_req_dump_free(req);
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if (!rsp)
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goto err_close;
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if (ynl_dump_empty(rsp))
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fprintf(stderr, "Error: no addresses reported\n");
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ynl_dump_foreach(rsp, qdisc)
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tc_qdisc_print(qdisc);
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tc_getqdisc_list_free(rsp);
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ynl_sock_destroy(ys);
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return 0;
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err_close:
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fprintf(stderr, "YNL: %s\n", ys->err.msg);
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err_destroy:
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ynl_sock_destroy(ys);
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return 2;
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}