timer_lockup.c

  1// SPDX-License-Identifier: GPL-2.0
  2
  3#define _GNU_SOURCE
  4#include <sched.h>
  5#include <test_progs.h>
  6#include <pthread.h>
  7#include <network_helpers.h>
  8#include <sys/sysinfo.h>
  9
 10#include "timer_lockup.skel.h"
 11
 12static long cpu;
 13static int *timer1_err;
 14static int *timer2_err;
 15static bool skip;
 16
 17volatile int k = 0;
 18
 19static void *timer_lockup_thread(void *arg)
 20{
 21	LIBBPF_OPTS(bpf_test_run_opts, opts,
 22		.data_in	= &pkt_v4,
 23		.data_size_in	= sizeof(pkt_v4),
 24		.repeat		= 1000,
 25	);
 26	int i, prog_fd = *(int *)arg;
 27	cpu_set_t cpuset;
 28
 29	CPU_ZERO(&cpuset);
 30	CPU_SET(__sync_fetch_and_add(&cpu, 1), &cpuset);
 31	ASSERT_OK(pthread_setaffinity_np(pthread_self(), sizeof(cpuset),
 32				         &cpuset),
 33		  "cpu affinity");
 34
 35	for (i = 0; !READ_ONCE(*timer1_err) && !READ_ONCE(*timer2_err); i++) {
 36		bpf_prog_test_run_opts(prog_fd, &opts);
 37		/* Skip the test if we can't reproduce the race in a reasonable
 38		 * amount of time.
 39		 */
 40		if (i > 50) {
 41			WRITE_ONCE(skip, true);
 42			break;
 43		}
 44	}
 45
 46	return NULL;
 47}
 48
 49void test_timer_lockup(void)
 50{
 51	int timer1_prog, timer2_prog;
 52	struct timer_lockup *skel;
 53	pthread_t thrds[2];
 54	void *ret;
 55
 56	if (get_nprocs() < 2) {
 57		test__skip();
 58		return;
 59	}
 60
 61	skel = timer_lockup__open_and_load();
 62	if (!skel && errno == EOPNOTSUPP) {
 63		test__skip();
 64		return;
 65	}
 66	if (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
 67		return;
 68
 69	timer1_prog = bpf_program__fd(skel->progs.timer1_prog);
 70	timer2_prog = bpf_program__fd(skel->progs.timer2_prog);
 71
 72	timer1_err = &skel->bss->timer1_err;
 73	timer2_err = &skel->bss->timer2_err;
 74
 75	if (!ASSERT_OK(pthread_create(&thrds[0], NULL, timer_lockup_thread,
 76				      &timer1_prog),
 77		       "pthread_create thread1"))
 78		goto out;
 79	if (!ASSERT_OK(pthread_create(&thrds[1], NULL, timer_lockup_thread,
 80				      &timer2_prog),
 81		       "pthread_create thread2")) {
 82		pthread_exit(&thrds[0]);
 83		goto out;
 84	}
 85
 86	pthread_join(thrds[1], &ret);
 87	pthread_join(thrds[0], &ret);
 88
 89	if (skip) {
 90		test__skip();
 91		goto out;
 92	}
 93
 94	if (*timer1_err != -EDEADLK && *timer1_err != 0)
 95		ASSERT_FAIL("timer1_err bad value");
 96	if (*timer2_err != -EDEADLK && *timer2_err != 0)
 97		ASSERT_FAIL("timer2_err bad value");
 98out:
 99	timer_lockup__destroy(skel);
100	return;
101}