// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <linux/compiler.h>
#include <linux/err.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/btf.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <test_btf.h>
#include <test_maps.h>
static struct bpf_map_create_opts map_opts = {
.sz = sizeof(map_opts),
.btf_key_type_id = 1,
.btf_value_type_id = 3,
.btf_fd = -1,
.map_flags = BPF_F_NO_PREALLOC,
};
static unsigned int nr_sk_threads_done;
static unsigned int nr_sk_threads_err;
static unsigned int nr_sk_per_thread = 4096;
static unsigned int nr_sk_threads = 4;
static int sk_storage_map = -1;
static unsigned int stop;
static int runtime_s = 5;
static bool is_stopped(void)
{
return READ_ONCE(stop);
}
static unsigned int threads_err(void)
{
return READ_ONCE(nr_sk_threads_err);
}
static void notify_thread_err(void)
{
__sync_add_and_fetch(&nr_sk_threads_err, 1);
}
static bool wait_for_threads_err(void)
{
while (!is_stopped() && !threads_err())
usleep(500);
return !is_stopped();
}
static unsigned int threads_done(void)
{
return READ_ONCE(nr_sk_threads_done);
}
static void notify_thread_done(void)
{
__sync_add_and_fetch(&nr_sk_threads_done, 1);
}
static void notify_thread_redo(void)
{
__sync_sub_and_fetch(&nr_sk_threads_done, 1);
}
static bool wait_for_threads_done(void)
{
while (threads_done() != nr_sk_threads && !is_stopped() &&
!threads_err())
usleep(50);
return !is_stopped() && !threads_err();
}
static bool wait_for_threads_redo(void)
{
while (threads_done() && !is_stopped() && !threads_err())
usleep(50);
return !is_stopped() && !threads_err();
}
static bool wait_for_map(void)
{
while (READ_ONCE(sk_storage_map) == -1 && !is_stopped())
usleep(50);
return !is_stopped();
}
static bool wait_for_map_close(void)
{
while (READ_ONCE(sk_storage_map) != -1 && !is_stopped())
;
return !is_stopped();
}
static int load_btf(void)
{
const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l";
__u32 btf_raw_types[] = {
/* int */
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
/* struct bpf_spin_lock */ /* [2] */
BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
BTF_MEMBER_ENC(15, 1, 0), /* int val; */
/* struct val */ /* [3] */
BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
};
struct btf_header btf_hdr = {
.magic = BTF_MAGIC,
.version = BTF_VERSION,
.hdr_len = sizeof(struct btf_header),
.type_len = sizeof(btf_raw_types),
.str_off = sizeof(btf_raw_types),
.str_len = sizeof(btf_str_sec),
};
__u8 raw_btf[sizeof(struct btf_header) + sizeof(btf_raw_types) +
sizeof(btf_str_sec)];
memcpy(raw_btf, &btf_hdr, sizeof(btf_hdr));
memcpy(raw_btf + sizeof(btf_hdr), btf_raw_types, sizeof(btf_raw_types));
memcpy(raw_btf + sizeof(btf_hdr) + sizeof(btf_raw_types),
btf_str_sec, sizeof(btf_str_sec));
return bpf_btf_load(raw_btf, sizeof(raw_btf), NULL);
}
static int create_sk_storage_map(void)
{
int btf_fd, map_fd;
btf_fd = load_btf();
CHECK(btf_fd == -1, "bpf_load_btf", "btf_fd:%d errno:%d\n",
btf_fd, errno);
map_opts.btf_fd = btf_fd;
map_fd = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 0, &map_opts);
map_opts.btf_fd = -1;
close(btf_fd);
CHECK(map_fd == -1,
"bpf_map_create()", "errno:%d\n", errno);
return map_fd;
}
static void *insert_close_thread(void *arg)
{
struct {
int cnt;
int lock;
} value = { .cnt = 0xeB9F, .lock = 0, };
int i, map_fd, err, *sk_fds;
sk_fds = malloc(sizeof(*sk_fds) * nr_sk_per_thread);
if (!sk_fds) {
notify_thread_err();
return ERR_PTR(-ENOMEM);
}
for (i = 0; i < nr_sk_per_thread; i++)
sk_fds[i] = -1;
while (!is_stopped()) {
if (!wait_for_map())
goto close_all;
map_fd = READ_ONCE(sk_storage_map);
for (i = 0; i < nr_sk_per_thread && !is_stopped(); i++) {
sk_fds[i] = socket(AF_INET6, SOCK_STREAM, 0);
if (sk_fds[i] == -1) {
err = -errno;
fprintf(stderr, "socket(): errno:%d\n", errno);
goto errout;
}
err = bpf_map_update_elem(map_fd, &sk_fds[i], &value,
BPF_NOEXIST);
if (err) {
err = -errno;
fprintf(stderr,
"bpf_map_update_elem(): errno:%d\n",
errno);
goto errout;
}
}
notify_thread_done();
wait_for_map_close();
close_all:
for (i = 0; i < nr_sk_per_thread; i++) {
close(sk_fds[i]);
sk_fds[i] = -1;
}
notify_thread_redo();
}
free(sk_fds);
return NULL;
errout:
for (i = 0; i < nr_sk_per_thread && sk_fds[i] != -1; i++)
close(sk_fds[i]);
free(sk_fds);
notify_thread_err();
return ERR_PTR(err);
}
static int do_sk_storage_map_stress_free(void)
{
int i, map_fd = -1, err = 0, nr_threads_created = 0;
pthread_t *sk_thread_ids;
void *thread_ret;
sk_thread_ids = malloc(sizeof(pthread_t) * nr_sk_threads);
if (!sk_thread_ids) {
fprintf(stderr, "malloc(sk_threads): NULL\n");
return -ENOMEM;
}
for (i = 0; i < nr_sk_threads; i++) {
err = pthread_create(&sk_thread_ids[i], NULL,
insert_close_thread, NULL);
if (err) {
err = -errno;
goto done;
}
nr_threads_created++;
}
while (!is_stopped()) {
map_fd = create_sk_storage_map();
WRITE_ONCE(sk_storage_map, map_fd);
if (!wait_for_threads_done())
break;
WRITE_ONCE(sk_storage_map, -1);
close(map_fd);
map_fd = -1;
if (!wait_for_threads_redo())
break;
}
done:
WRITE_ONCE(stop, 1);
for (i = 0; i < nr_threads_created; i++) {
pthread_join(sk_thread_ids[i], &thread_ret);
if (IS_ERR(thread_ret) && !err) {
err = PTR_ERR(thread_ret);
fprintf(stderr, "threads#%u: err:%d\n", i, err);
}
}
free(sk_thread_ids);
if (map_fd != -1)
close(map_fd);
return err;
}
static void *update_thread(void *arg)
{
struct {
int cnt;
int lock;
} value = { .cnt = 0xeB9F, .lock = 0, };
int map_fd = READ_ONCE(sk_storage_map);
int sk_fd = *(int *)arg;
int err = 0; /* Suppress compiler false alarm */
while (!is_stopped()) {
err = bpf_map_update_elem(map_fd, &sk_fd, &value, 0);
if (err && errno != EAGAIN) {
err = -errno;
fprintf(stderr, "bpf_map_update_elem: %d %d\n",
err, errno);
break;
}
}
if (!is_stopped()) {
notify_thread_err();
return ERR_PTR(err);
}
return NULL;
}
static void *delete_thread(void *arg)
{
int map_fd = READ_ONCE(sk_storage_map);
int sk_fd = *(int *)arg;
int err = 0; /* Suppress compiler false alarm */
while (!is_stopped()) {
err = bpf_map_delete_elem(map_fd, &sk_fd);
if (err && errno != ENOENT) {
err = -errno;
fprintf(stderr, "bpf_map_delete_elem: %d %d\n",
err, errno);
break;
}
}
if (!is_stopped()) {
notify_thread_err();
return ERR_PTR(err);
}
return NULL;
}
static int do_sk_storage_map_stress_change(void)
{
int i, sk_fd, map_fd = -1, err = 0, nr_threads_created = 0;
pthread_t *sk_thread_ids;
void *thread_ret;
sk_thread_ids = malloc(sizeof(pthread_t) * nr_sk_threads);
if (!sk_thread_ids) {
fprintf(stderr, "malloc(sk_threads): NULL\n");
return -ENOMEM;
}
sk_fd = socket(AF_INET6, SOCK_STREAM, 0);
if (sk_fd == -1) {
err = -errno;
goto done;
}
map_fd = create_sk_storage_map();
WRITE_ONCE(sk_storage_map, map_fd);
for (i = 0; i < nr_sk_threads; i++) {
if (i & 0x1)
err = pthread_create(&sk_thread_ids[i], NULL,
update_thread, &sk_fd);
else
err = pthread_create(&sk_thread_ids[i], NULL,
delete_thread, &sk_fd);
if (err) {
err = -errno;
goto done;
}
nr_threads_created++;
}
wait_for_threads_err();
done:
WRITE_ONCE(stop, 1);
for (i = 0; i < nr_threads_created; i++) {
pthread_join(sk_thread_ids[i], &thread_ret);
if (IS_ERR(thread_ret) && !err) {
err = PTR_ERR(thread_ret);
fprintf(stderr, "threads#%u: err:%d\n", i, err);
}
}
free(sk_thread_ids);
if (sk_fd != -1)
close(sk_fd);
close(map_fd);
return err;
}
static void stop_handler(int signum)
{
if (signum != SIGALRM)
printf("stopping...\n");
WRITE_ONCE(stop, 1);
}
#define BPF_SK_STORAGE_MAP_TEST_NR_THREADS "BPF_SK_STORAGE_MAP_TEST_NR_THREADS"
#define BPF_SK_STORAGE_MAP_TEST_SK_PER_THREAD "BPF_SK_STORAGE_MAP_TEST_SK_PER_THREAD"
#define BPF_SK_STORAGE_MAP_TEST_RUNTIME_S "BPF_SK_STORAGE_MAP_TEST_RUNTIME_S"
#define BPF_SK_STORAGE_MAP_TEST_NAME "BPF_SK_STORAGE_MAP_TEST_NAME"
static void test_sk_storage_map_stress_free(void)
{
struct rlimit rlim_old, rlim_new = {};
int err;
getrlimit(RLIMIT_NOFILE, &rlim_old);
signal(SIGTERM, stop_handler);
signal(SIGINT, stop_handler);
if (runtime_s > 0) {
signal(SIGALRM, stop_handler);
alarm(runtime_s);
}
if (rlim_old.rlim_cur < nr_sk_threads * nr_sk_per_thread) {
rlim_new.rlim_cur = nr_sk_threads * nr_sk_per_thread + 128;
rlim_new.rlim_max = rlim_new.rlim_cur + 128;
err = setrlimit(RLIMIT_NOFILE, &rlim_new);
CHECK(err, "setrlimit(RLIMIT_NOFILE)", "rlim_new:%lu errno:%d",
rlim_new.rlim_cur, errno);
}
err = do_sk_storage_map_stress_free();
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
if (runtime_s > 0) {
signal(SIGALRM, SIG_DFL);
alarm(0);
}
if (rlim_new.rlim_cur)
setrlimit(RLIMIT_NOFILE, &rlim_old);
CHECK(err, "test_sk_storage_map_stress_free", "err:%d\n", err);
}
static void test_sk_storage_map_stress_change(void)
{
int err;
signal(SIGTERM, stop_handler);
signal(SIGINT, stop_handler);
if (runtime_s > 0) {
signal(SIGALRM, stop_handler);
alarm(runtime_s);
}
err = do_sk_storage_map_stress_change();
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
if (runtime_s > 0) {
signal(SIGALRM, SIG_DFL);
alarm(0);
}
CHECK(err, "test_sk_storage_map_stress_change", "err:%d\n", err);
}
static void test_sk_storage_map_basic(void)
{
struct {
int cnt;
int lock;
} value = { .cnt = 0xeB9f, .lock = 1, }, lookup_value;
struct bpf_map_create_opts bad_xattr;
int btf_fd, map_fd, sk_fd, err;
btf_fd = load_btf();
CHECK(btf_fd == -1, "bpf_load_btf", "btf_fd:%d errno:%d\n",
btf_fd, errno);
map_opts.btf_fd = btf_fd;
sk_fd = socket(AF_INET6, SOCK_STREAM, 0);
CHECK(sk_fd == -1, "socket()", "sk_fd:%d errno:%d\n",
sk_fd, errno);
map_fd = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 0, &map_opts);
CHECK(map_fd == -1, "bpf_map_create(good_xattr)",
"map_fd:%d errno:%d\n", map_fd, errno);
/* Add new elem */
memcpy(&lookup_value, &value, sizeof(value));
err = bpf_map_update_elem(map_fd, &sk_fd, &value,
BPF_NOEXIST | BPF_F_LOCK);
CHECK(err, "bpf_map_update_elem(BPF_NOEXIST|BPF_F_LOCK)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(err || lookup_value.lock || lookup_value.cnt != value.cnt,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d lock:%x cnt:%x(%x)\n",
err, errno, lookup_value.lock, lookup_value.cnt, value.cnt);
/* Bump the cnt and update with BPF_EXIST | BPF_F_LOCK */
value.cnt += 1;
value.lock = 2;
err = bpf_map_update_elem(map_fd, &sk_fd, &value,
BPF_EXIST | BPF_F_LOCK);
CHECK(err, "bpf_map_update_elem(BPF_EXIST|BPF_F_LOCK)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(err || lookup_value.lock || lookup_value.cnt != value.cnt,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d lock:%x cnt:%x(%x)\n",
err, errno, lookup_value.lock, lookup_value.cnt, value.cnt);
/* Bump the cnt and update with BPF_EXIST */
value.cnt += 1;
value.lock = 2;
err = bpf_map_update_elem(map_fd, &sk_fd, &value, BPF_EXIST);
CHECK(err, "bpf_map_update_elem(BPF_EXIST)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(err || lookup_value.lock || lookup_value.cnt != value.cnt,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d lock:%x cnt:%x(%x)\n",
err, errno, lookup_value.lock, lookup_value.cnt, value.cnt);
/* Update with BPF_NOEXIST */
value.cnt += 1;
value.lock = 2;
err = bpf_map_update_elem(map_fd, &sk_fd, &value,
BPF_NOEXIST | BPF_F_LOCK);
CHECK(!err || errno != EEXIST,
"bpf_map_update_elem(BPF_NOEXIST|BPF_F_LOCK)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_update_elem(map_fd, &sk_fd, &value, BPF_NOEXIST);
CHECK(!err || errno != EEXIST, "bpf_map_update_elem(BPF_NOEXIST)",
"err:%d errno:%d\n", err, errno);
value.cnt -= 1;
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(err || lookup_value.lock || lookup_value.cnt != value.cnt,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d lock:%x cnt:%x(%x)\n",
err, errno, lookup_value.lock, lookup_value.cnt, value.cnt);
/* Bump the cnt again and update with map_flags == 0 */
value.cnt += 1;
value.lock = 2;
err = bpf_map_update_elem(map_fd, &sk_fd, &value, 0);
CHECK(err, "bpf_map_update_elem()", "err:%d errno:%d\n",
err, errno);
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(err || lookup_value.lock || lookup_value.cnt != value.cnt,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d lock:%x cnt:%x(%x)\n",
err, errno, lookup_value.lock, lookup_value.cnt, value.cnt);
/* Test delete elem */
err = bpf_map_delete_elem(map_fd, &sk_fd);
CHECK(err, "bpf_map_delete_elem()", "err:%d errno:%d\n",
err, errno);
err = bpf_map_lookup_elem_flags(map_fd, &sk_fd, &lookup_value,
BPF_F_LOCK);
CHECK(!err || errno != ENOENT,
"bpf_map_lookup_elem_flags(BPF_F_LOCK)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_delete_elem(map_fd, &sk_fd);
CHECK(!err || errno != ENOENT, "bpf_map_delete_elem()",
"err:%d errno:%d\n", err, errno);
memcpy(&bad_xattr, &map_opts, sizeof(map_opts));
bad_xattr.btf_key_type_id = 0;
err = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 0, &bad_xattr);
CHECK(!err || errno != EINVAL, "bpf_map_create(bad_xattr)",
"err:%d errno:%d\n", err, errno);
memcpy(&bad_xattr, &map_opts, sizeof(map_opts));
bad_xattr.btf_key_type_id = 3;
err = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 0, &bad_xattr);
CHECK(!err || errno != EINVAL, "bpf_map_create(bad_xattr)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 1, &map_opts);
CHECK(!err || errno != EINVAL, "bpf_map_create(bad_xattr)",
"err:%d errno:%d\n", err, errno);
memcpy(&bad_xattr, &map_opts, sizeof(map_opts));
bad_xattr.map_flags = 0;
err = bpf_map_create(BPF_MAP_TYPE_SK_STORAGE, "sk_storage_map", 4, 8, 0, &bad_xattr);
CHECK(!err || errno != EINVAL, "bap_create_map_xattr(bad_xattr)",
"err:%d errno:%d\n", err, errno);
map_opts.btf_fd = -1;
close(btf_fd);
close(map_fd);
close(sk_fd);
}
void test_sk_storage_map(void)
{
const char *test_name, *env_opt;
bool test_ran = false;
test_name = getenv(BPF_SK_STORAGE_MAP_TEST_NAME);
env_opt = getenv(BPF_SK_STORAGE_MAP_TEST_NR_THREADS);
if (env_opt)
nr_sk_threads = atoi(env_opt);
env_opt = getenv(BPF_SK_STORAGE_MAP_TEST_SK_PER_THREAD);
if (env_opt)
nr_sk_per_thread = atoi(env_opt);
env_opt = getenv(BPF_SK_STORAGE_MAP_TEST_RUNTIME_S);
if (env_opt)
runtime_s = atoi(env_opt);
if (!test_name || !strcmp(test_name, "basic")) {
test_sk_storage_map_basic();
test_ran = true;
}
if (!test_name || !strcmp(test_name, "stress_free")) {
test_sk_storage_map_stress_free();
test_ran = true;
}
if (!test_name || !strcmp(test_name, "stress_change")) {
test_sk_storage_map_stress_change();
test_ran = true;
}
if (test_ran)
printf("%s:PASS\n", __func__);
else
CHECK(1, "Invalid test_name", "%s\n", test_name);
}
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