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 (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
63		return;
64
65	timer1_prog = bpf_program__fd(skel->progs.timer1_prog);
66	timer2_prog = bpf_program__fd(skel->progs.timer2_prog);
67
68	timer1_err = &skel->bss->timer1_err;
69	timer2_err = &skel->bss->timer2_err;
70
71	if (!ASSERT_OK(pthread_create(&thrds[0], NULL, timer_lockup_thread,
72				      &timer1_prog),
73		       "pthread_create thread1"))
74		goto out;
75	if (!ASSERT_OK(pthread_create(&thrds[1], NULL, timer_lockup_thread,
76				      &timer2_prog),
77		       "pthread_create thread2")) {
78		pthread_exit(&thrds[0]);
79		goto out;
80	}
81
82	pthread_join(thrds[1], &ret);
83	pthread_join(thrds[0], &ret);
84
85	if (skip) {
86		test__skip();
87		goto out;
88	}
89
90	if (*timer1_err != -EDEADLK && *timer1_err != 0)
91		ASSERT_FAIL("timer1_err bad value");
92	if (*timer2_err != -EDEADLK && *timer2_err != 0)
93		ASSERT_FAIL("timer2_err bad value");
94out:
95	timer_lockup__destroy(skel);
96	return;
97}