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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024-2025 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include <network_helpers.h>
#include <sys/sysinfo.h>
#include <sys/syscall.h>
#include <linux/perf_event.h>
#include "res_spin_lock.skel.h"
#include "res_spin_lock_fail.skel.h"
void test_res_spin_lock_failure(void)
{
RUN_TESTS(res_spin_lock_fail);
}
static volatile int skip;
static void *spin_lock_thread(void *arg)
{
int err, prog_fd = *(u32 *) arg;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 10000,
);
while (!READ_ONCE(skip)) {
err = bpf_prog_test_run_opts(prog_fd, &topts);
if (err || topts.retval) {
ASSERT_OK(err, "test_run");
ASSERT_OK(topts.retval, "test_run retval");
break;
}
}
pthread_exit(arg);
}
void test_res_spin_lock_success(void)
{
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
struct res_spin_lock *skel;
pthread_t thread_id[16];
int prog_fd, i, err;
void *ret;
if (get_nprocs() < 2) {
test__skip();
return;
}
skel = res_spin_lock__open_and_load();
if (!ASSERT_OK_PTR(skel, "res_spin_lock__open_and_load"))
return;
/* AA deadlock */
prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "error");
ASSERT_OK(topts.retval, "retval");
prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test_held_lock_max);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "error");
ASSERT_OK(topts.retval, "retval");
/* Multi-threaded ABBA deadlock. */
prog_fd = bpf_program__fd(skel->progs.res_spin_lock_test_AB);
for (i = 0; i < 16; i++) {
int err;
err = pthread_create(&thread_id[i], NULL, &spin_lock_thread, &prog_fd);
if (!ASSERT_OK(err, "pthread_create"))
goto end;
}
topts.retval = 0;
topts.repeat = 1000;
int fd = bpf_program__fd(skel->progs.res_spin_lock_test_BA);
while (!topts.retval && !err && !READ_ONCE(skel->bss->err)) {
err = bpf_prog_test_run_opts(fd, &topts);
}
WRITE_ONCE(skip, true);
for (i = 0; i < 16; i++) {
if (!ASSERT_OK(pthread_join(thread_id[i], &ret), "pthread_join"))
goto end;
if (!ASSERT_EQ(ret, &prog_fd, "ret == prog_fd"))
goto end;
}
ASSERT_EQ(READ_ONCE(skel->bss->err), -EDEADLK, "timeout err");
ASSERT_OK(err, "err");
ASSERT_EQ(topts.retval, -EDEADLK, "timeout");
end:
res_spin_lock__destroy(skel);
return;
}
void serial_test_res_spin_lock_stress(void)
{
struct perf_event_attr attr = {
.size = sizeof(attr),
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES,
};
int pmu_fd;
if (libbpf_num_possible_cpus() < 3) {
test__skip();
return;
}
pmu_fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
if (pmu_fd < 0) {
if (errno == ENOENT || errno == EOPNOTSUPP) {
test__skip();
return;
}
ASSERT_OK(-errno, "perf_event_open pmu probe");
return;
}
close(pmu_fd);
ASSERT_OK(load_module("bpf_test_rqspinlock.ko", false), "load module AA");
sleep(5);
unload_module("bpf_test_rqspinlock", false);
/*
* Insert bpf_test_rqspinlock.ko manually with test_mode=[1|2] to test
* other cases (ABBA, ABBCCA).
*/
}
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