Quelle  timer_lockup.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0

#define _GNU_SOURCE
#include <sched.h>
#include <test_progs.h>
#include <pthread.h>
#include <network_helpers.h>
#include <sys/sysinfo.h>

#include "timer_lockup.skel.h"

static long cpu;
static int *timer1_err;
static int *timer2_err;
static bool skip;

volatile int k = 0;

static void *timer_lockup_thread(void *arg)
{
 LIBBPF_OPTS(bpf_test_run_opts, opts,
  .data_in = &pkt_v4,
  .data_size_in = sizeof(pkt_v4),
  .repeat  = 1000,
 );
 int i, prog_fd = *(int *)arg;
 cpu_set_t cpuset;

 CPU_ZERO(&cpuset);
 CPU_SET(__sync_fetch_and_add(&cpu, 1), &cpuset);
 ASSERT_OK(pthread_setaffinity_np(pthread_self(), sizeof(cpuset),
             &cpuset),
    "cpu affinity");

 for (i = 0; !READ_ONCE(*timer1_err) && !READ_ONCE(*timer2_err); i++) {
  bpf_prog_test_run_opts(prog_fd, &opts);
  /* Skip the test if we can't reproduce the race in a reasonable
 * amount of time.
 */
  if (i > 50) {
   WRITE_ONCE(skip, true);
   break;
  }
 }

 return NULL;
}

void test_timer_lockup(void)
{
 int timer1_prog, timer2_prog;
 struct timer_lockup *skel;
 pthread_t thrds[2];
 void *ret;

 if (get_nprocs() < 2) {
  test__skip();
  return;
 }

 skel = timer_lockup__open_and_load();
 if (!skel && errno == EOPNOTSUPP) {
  test__skip();
  return;
 }
 if (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
  return;

 timer1_prog = bpf_program__fd(skel->progs.timer1_prog);
 timer2_prog = bpf_program__fd(skel->progs.timer2_prog);

 timer1_err = &skel->bss->timer1_err;
 timer2_err = &skel->bss->timer2_err;

 if (!ASSERT_OK(pthread_create(&thrds[0], NULL, timer_lockup_thread,
          &timer1_prog),
         "pthread_create thread1"))
  goto out;
 if (!ASSERT_OK(pthread_create(&thrds[1], NULL, timer_lockup_thread,
          &timer2_prog),
         "pthread_create thread2")) {
  pthread_exit(&thrds[0]);
  goto out;
 }

 pthread_join(thrds[1], &ret);
 pthread_join(thrds[0], &ret);

 if (skip) {
  test__skip();
  goto out;
 }

 if (*timer1_err != -EDEADLK && *timer1_err != 0)
  ASSERT_FAIL("timer1_err bad value");
 if (*timer2_err != -EDEADLK && *timer2_err != 0)
  ASSERT_FAIL("timer2_err bad value");
out:
 timer_lockup__destroy(skel);
 return;
}