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/* Copyright (c) 2017 Facebook
*/
#define _GNU_SOURCE
#include "test_progs.h"
#include "cgroup_helpers.h"
#include "bpf_rlimit.h"
#include <argp.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <execinfo.h> /* backtrace */
#define EXIT_NO_TEST 2
#define EXIT_ERR_SETUP_INFRA 3
/* defined in test_progs.h */
struct test_env env = {};
struct prog_test_def {
const char *test_name;
int test_num;
void (*run_test)(void);
bool force_log;
int error_cnt;
int skip_cnt;
bool tested;
bool need_cgroup_cleanup;
char *subtest_name;
int subtest_num;
/* store counts before subtest started */
int old_error_cnt;
};
/* Override C runtime library's usleep() implementation to ensure nanosleep()
* is always called. Usleep is frequently used in selftests as a way to
* trigger kprobe and tracepoints.
*/
int usleep(useconds_t usec)
{
struct timespec ts = {
.tv_sec = usec / 1000000,
.tv_nsec = (usec % 1000000) * 1000,
};
return syscall(__NR_nanosleep, &ts, NULL);
}
static bool should_run(struct test_selector *sel, int num, const char *name)
{
int i;
for (i = 0; i < sel->blacklist.cnt; i++) {
if (strstr(name, sel->blacklist.strs[i]))
return false;
}
for (i = 0; i < sel->whitelist.cnt; i++) {
if (strstr(name, sel->whitelist.strs[i]))
return true;
}
if (!sel->whitelist.cnt && !sel->num_set)
return true;
return num < sel->num_set_len && sel->num_set[num];
}
static void dump_test_log(const struct prog_test_def *test, bool failed)
{
if (stdout == env.stdout)
return;
fflush(stdout); /* exports env.log_buf & env.log_cnt */
if (env.verbosity > VERBOSE_NONE || test->force_log || failed) {
if (env.log_cnt) {
env.log_buf[env.log_cnt] = '\0';
fprintf(env.stdout, "%s", env.log_buf);
if (env.log_buf[env.log_cnt - 1] != '\n')
fprintf(env.stdout, "\n");
}
}
fseeko(stdout, 0, SEEK_SET); /* rewind */
}
static void skip_account(void)
{
if (env.test->skip_cnt) {
env.skip_cnt++;
env.test->skip_cnt = 0;
}
}
static void stdio_restore(void);
/* A bunch of tests set custom affinity per-thread and/or per-process. Reset
* it after each test/sub-test.
*/
static void reset_affinity() {
cpu_set_t cpuset;
int i, err;
CPU_ZERO(&cpuset);
for (i = 0; i < env.nr_cpus; i++)
CPU_SET(i, &cpuset);
err = sched_setaffinity(0, sizeof(cpuset), &cpuset);
if (err < 0) {
stdio_restore();
fprintf(stderr, "Failed to reset process affinity: %d!\n", err);
exit(EXIT_ERR_SETUP_INFRA);
}
err = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
if (err < 0) {
stdio_restore();
fprintf(stderr, "Failed to reset thread affinity: %d!\n", err);
exit(EXIT_ERR_SETUP_INFRA);
}
}
static void save_netns(void)
{
env.saved_netns_fd = open("/proc/self/ns/net", O_RDONLY);
if (env.saved_netns_fd == -1) {
perror("open(/proc/self/ns/net)");
exit(EXIT_ERR_SETUP_INFRA);
}
}
static void restore_netns(void)
{
if (setns(env.saved_netns_fd, CLONE_NEWNET) == -1) {
stdio_restore();
perror("setns(CLONE_NEWNS)");
exit(EXIT_ERR_SETUP_INFRA);
}
}
void test__end_subtest()
{
struct prog_test_def *test = env.test;
int sub_error_cnt = test->error_cnt - test->old_error_cnt;
if (sub_error_cnt)
env.fail_cnt++;
else
env.sub_succ_cnt++;
skip_account();
dump_test_log(test, sub_error_cnt);
fprintf(env.stdout, "#%d/%d %s:%s\n",
test->test_num, test->subtest_num,
test->subtest_name, sub_error_cnt ? "FAIL" : "OK");
free(test->subtest_name);
test->subtest_name = NULL;
}
bool test__start_subtest(const char *name)
{
struct prog_test_def *test = env.test;
if (test->subtest_name)
test__end_subtest();
test->subtest_num++;
if (!name || !name[0]) {
fprintf(env.stderr,
"Subtest #%d didn't provide sub-test name!\n",
test->subtest_num);
return false;
}
if (!should_run(&env.subtest_selector, test->subtest_num, name))
return false;
test->subtest_name = strdup(name);
if (!test->subtest_name) {
fprintf(env.stderr,
"Subtest #%d: failed to copy subtest name!\n",
test->subtest_num);
return false;
}
env.test->old_error_cnt = env.test->error_cnt;
return true;
}
void test__force_log() {
env.test->force_log = true;
}
void test__skip(void)
{
env.test->skip_cnt++;
}
void test__fail(void)
{
env.test->error_cnt++;
}
int test__join_cgroup(const char *path)
{
int fd;
if (!env.test->need_cgroup_cleanup) {
if (setup_cgroup_environment()) {
fprintf(stderr,
"#%d %s: Failed to setup cgroup environment\n",
env.test->test_num, env.test->test_name);
return -1;
}
env.test->need_cgroup_cleanup = true;
}
fd = create_and_get_cgroup(path);
if (fd < 0) {
fprintf(stderr,
"#%d %s: Failed to create cgroup '%s' (errno=%d)\n",
env.test->test_num, env.test->test_name, path, errno);
return fd;
}
if (join_cgroup(path)) {
fprintf(stderr,
"#%d %s: Failed to join cgroup '%s' (errno=%d)\n",
env.test->test_num, env.test->test_name, path, errno);
return -1;
}
return fd;
}
int bpf_find_map(const char *test, struct bpf_object *obj, const char *name)
{
struct bpf_map *map;
map = bpf_object__find_map_by_name(obj, name);
if (!map) {
fprintf(stdout, "%s:FAIL:map '%s' not found\n", test, name);
test__fail();
return -1;
}
return bpf_map__fd(map);
}
static bool is_jit_enabled(void)
{
const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
bool enabled = false;
int sysctl_fd;
sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
if (sysctl_fd != -1) {
char tmpc;
if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1)
enabled = (tmpc != '0');
close(sysctl_fd);
}
return enabled;
}
int compare_map_keys(int map1_fd, int map2_fd)
{
__u32 key, next_key;
char val_buf[PERF_MAX_STACK_DEPTH *
sizeof(struct bpf_stack_build_id)];
int err;
err = bpf_map_get_next_key(map1_fd, NULL, &key);
if (err)
return err;
err = bpf_map_lookup_elem(map2_fd, &key, val_buf);
if (err)
return err;
while (bpf_map_get_next_key(map1_fd, &key, &next_key) == 0) {
err = bpf_map_lookup_elem(map2_fd, &next_key, val_buf);
if (err)
return err;
key = next_key;
}
if (errno != ENOENT)
return -1;
return 0;
}
int compare_stack_ips(int smap_fd, int amap_fd, int stack_trace_len)
{
__u32 key, next_key, *cur_key_p, *next_key_p;
char *val_buf1, *val_buf2;
int i, err = 0;
val_buf1 = malloc(stack_trace_len);
val_buf2 = malloc(stack_trace_len);
cur_key_p = NULL;
next_key_p = &key;
while (bpf_map_get_next_key(smap_fd, cur_key_p, next_key_p) == 0) {
err = bpf_map_lookup_elem(smap_fd, next_key_p, val_buf1);
if (err)
goto out;
err = bpf_map_lookup_elem(amap_fd, next_key_p, val_buf2);
if (err)
goto out;
for (i = 0; i < stack_trace_len; i++) {
if (val_buf1[i] != val_buf2[i]) {
err = -1;
goto out;
}
}
key = *next_key_p;
cur_key_p = &key;
next_key_p = &next_key;
}
if (errno != ENOENT)
err = -1;
out:
free(val_buf1);
free(val_buf2);
return err;
}
int extract_build_id(char *build_id, size_t size)
{
FILE *fp;
char *line = NULL;
size_t len = 0;
fp = popen("readelf -n ./urandom_read | grep 'Build ID'", "r");
if (fp == NULL)
return -1;
if (getline(&line, &len, fp) == -1)
goto err;
fclose(fp);
if (len > size)
len = size;
memcpy(build_id, line, len);
build_id[len] = '\0';
free(line);
return 0;
err:
fclose(fp);
return -1;
}
/* extern declarations for test funcs */
#define DEFINE_TEST(name) extern void test_##name(void);
#include <prog_tests/tests.h>
#undef DEFINE_TEST
static struct prog_test_def prog_test_defs[] = {
#define DEFINE_TEST(name) { \
.test_name = #name, \
.run_test = &test_##name, \
},
#include <prog_tests/tests.h>
#undef DEFINE_TEST
};
const int prog_test_cnt = ARRAY_SIZE(prog_test_defs);
const char *argp_program_version = "test_progs 0.1";
const char *argp_program_bug_address = "<bpf@vger.kernel.org>";
const char argp_program_doc[] = "BPF selftests test runner";
enum ARG_KEYS {
ARG_TEST_NUM = 'n',
ARG_TEST_NAME = 't',
ARG_TEST_NAME_BLACKLIST = 'b',
ARG_VERIFIER_STATS = 's',
ARG_VERBOSE = 'v',
ARG_GET_TEST_CNT = 'c',
ARG_LIST_TEST_NAMES = 'l',
};
static const struct argp_option opts[] = {
{ "num", ARG_TEST_NUM, "NUM", 0,
"Run test number NUM only " },
{ "name", ARG_TEST_NAME, "NAMES", 0,
"Run tests with names containing any string from NAMES list" },
{ "name-blacklist", ARG_TEST_NAME_BLACKLIST, "NAMES", 0,
"Don't run tests with names containing any string from NAMES list" },
{ "verifier-stats", ARG_VERIFIER_STATS, NULL, 0,
"Output verifier statistics", },
{ "verbose", ARG_VERBOSE, "LEVEL", OPTION_ARG_OPTIONAL,
"Verbose output (use -vv or -vvv for progressively verbose output)" },
{ "count", ARG_GET_TEST_CNT, NULL, 0,
"Get number of selected top-level tests " },
{ "list", ARG_LIST_TEST_NAMES, NULL, 0,
"List test names that would run (without running them) " },
{},
};
static int libbpf_print_fn(enum libbpf_print_level level,
const char *format, va_list args)
{
if (env.verbosity < VERBOSE_VERY && level == LIBBPF_DEBUG)
return 0;
vfprintf(stdout, format, args);
return 0;
}
static void free_str_set(const struct str_set *set)
{
int i;
if (!set)
return;
for (i = 0; i < set->cnt; i++)
free((void *)set->strs[i]);
free(set->strs);
}
static int parse_str_list(const char *s, struct str_set *set)
{
char *input, *state = NULL, *next, **tmp, **strs = NULL;
int cnt = 0;
input = strdup(s);
if (!input)
return -ENOMEM;
set->cnt = 0;
set->strs = NULL;
while ((next = strtok_r(state ? NULL : input, ",", &state))) {
tmp = realloc(strs, sizeof(*strs) * (cnt + 1));
if (!tmp)
goto err;
strs = tmp;
strs[cnt] = strdup(next);
if (!strs[cnt])
goto err;
cnt++;
}
set->cnt = cnt;
set->strs = (const char **)strs;
free(input);
return 0;
err:
free(strs);
free(input);
return -ENOMEM;
}
extern int extra_prog_load_log_flags;
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
struct test_env *env = state->input;
switch (key) {
case ARG_TEST_NUM: {
char *subtest_str = strchr(arg, '/');
if (subtest_str) {
*subtest_str = '\0';
if (parse_num_list(subtest_str + 1,
&env->subtest_selector.num_set,
&env->subtest_selector.num_set_len)) {
fprintf(stderr,
"Failed to parse subtest numbers.\n");
return -EINVAL;
}
}
if (parse_num_list(arg, &env->test_selector.num_set,
&env->test_selector.num_set_len)) {
fprintf(stderr, "Failed to parse test numbers.\n");
return -EINVAL;
}
break;
}
case ARG_TEST_NAME: {
char *subtest_str = strchr(arg, '/');
if (subtest_str) {
*subtest_str = '\0';
if (parse_str_list(subtest_str + 1,
&env->subtest_selector.whitelist))
return -ENOMEM;
}
if (parse_str_list(arg, &env->test_selector.whitelist))
return -ENOMEM;
break;
}
case ARG_TEST_NAME_BLACKLIST: {
char *subtest_str = strchr(arg, '/');
if (subtest_str) {
*subtest_str = '\0';
if (parse_str_list(subtest_str + 1,
&env->subtest_selector.blacklist))
return -ENOMEM;
}
if (parse_str_list(arg, &env->test_selector.blacklist))
return -ENOMEM;
break;
}
case ARG_VERIFIER_STATS:
env->verifier_stats = true;
break;
case ARG_VERBOSE:
env->verbosity = VERBOSE_NORMAL;
if (arg) {
if (strcmp(arg, "v") == 0) {
env->verbosity = VERBOSE_VERY;
extra_prog_load_log_flags = 1;
} else if (strcmp(arg, "vv") == 0) {
env->verbosity = VERBOSE_SUPER;
extra_prog_load_log_flags = 2;
} else {
fprintf(stderr,
"Unrecognized verbosity setting ('%s'), only -v and -vv are supported\n",
arg);
return -EINVAL;
}
}
break;
case ARG_GET_TEST_CNT:
env->get_test_cnt = true;
break;
case ARG_LIST_TEST_NAMES:
env->list_test_names = true;
break;
case ARGP_KEY_ARG:
argp_usage(state);
break;
case ARGP_KEY_END:
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static void stdio_hijack(void)
{
#ifdef __GLIBC__
env.stdout = stdout;
env.stderr = stderr;
if (env.verbosity > VERBOSE_NONE) {
/* nothing to do, output to stdout by default */
return;
}
/* stdout and stderr -> buffer */
fflush(stdout);
stdout = open_memstream(&env.log_buf, &env.log_cnt);
if (!stdout) {
stdout = env.stdout;
perror("open_memstream");
return;
}
stderr = stdout;
#endif
}
static void stdio_restore(void)
{
#ifdef __GLIBC__
if (stdout == env.stdout)
return;
fclose(stdout);
free(env.log_buf);
env.log_buf = NULL;
env.log_cnt = 0;
stdout = env.stdout;
stderr = env.stderr;
#endif
}
/*
* Determine if test_progs is running as a "flavored" test runner and switch
* into corresponding sub-directory to load correct BPF objects.
*
* This is done by looking at executable name. If it contains "-flavor"
* suffix, then we are running as a flavored test runner.
*/
int cd_flavor_subdir(const char *exec_name)
{
/* General form of argv[0] passed here is:
* some/path/to/test_progs[-flavor], where -flavor part is optional.
* First cut out "test_progs[-flavor]" part, then extract "flavor"
* part, if it's there.
*/
const char *flavor = strrchr(exec_name, '/');
if (!flavor)
return 0;
flavor++;
flavor = strrchr(flavor, '-');
if (!flavor)
return 0;
flavor++;
if (env.verbosity > VERBOSE_NONE)
fprintf(stdout, "Switching to flavor '%s' subdirectory...\n", flavor);
return chdir(flavor);
}
#define MAX_BACKTRACE_SZ 128
void crash_handler(int signum)
{
void *bt[MAX_BACKTRACE_SZ];
size_t sz;
sz = backtrace(bt, ARRAY_SIZE(bt));
if (env.test)
dump_test_log(env.test, true);
if (env.stdout)
stdio_restore();
fprintf(stderr, "Caught signal #%d!\nStack trace:\n", signum);
backtrace_symbols_fd(bt, sz, STDERR_FILENO);
}
int main(int argc, char **argv)
{
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
struct sigaction sigact = {
.sa_handler = crash_handler,
.sa_flags = SA_RESETHAND,
};
int err, i;
sigaction(SIGSEGV, &sigact, NULL);
err = argp_parse(&argp, argc, argv, 0, NULL, &env);
if (err)
return err;
err = cd_flavor_subdir(argv[0]);
if (err)
return err;
libbpf_set_print(libbpf_print_fn);
srand(time(NULL));
env.jit_enabled = is_jit_enabled();
env.nr_cpus = libbpf_num_possible_cpus();
if (env.nr_cpus < 0) {
fprintf(stderr, "Failed to get number of CPUs: %d!\n",
env.nr_cpus);
return -1;
}
save_netns();
stdio_hijack();
for (i = 0; i < prog_test_cnt; i++) {
struct prog_test_def *test = &prog_test_defs[i];
env.test = test;
test->test_num = i + 1;
if (!should_run(&env.test_selector,
test->test_num, test->test_name))
continue;
if (env.get_test_cnt) {
env.succ_cnt++;
continue;
}
if (env.list_test_names) {
fprintf(env.stdout, "%s\n", test->test_name);
env.succ_cnt++;
continue;
}
test->run_test();
/* ensure last sub-test is finalized properly */
if (test->subtest_name)
test__end_subtest();
test->tested = true;
if (test->error_cnt)
env.fail_cnt++;
else
env.succ_cnt++;
skip_account();
dump_test_log(test, test->error_cnt);
fprintf(env.stdout, "#%d %s:%s\n",
test->test_num, test->test_name,
test->error_cnt ? "FAIL" : "OK");
reset_affinity();
restore_netns();
if (test->need_cgroup_cleanup)
cleanup_cgroup_environment();
}
stdio_restore();
if (env.get_test_cnt) {
printf("%d\n", env.succ_cnt);
goto out;
}
if (env.list_test_names)
goto out;
fprintf(stdout, "Summary: %d/%d PASSED, %d SKIPPED, %d FAILED\n",
env.succ_cnt, env.sub_succ_cnt, env.skip_cnt, env.fail_cnt);
out:
free_str_set(&env.test_selector.blacklist);
free_str_set(&env.test_selector.whitelist);
free(env.test_selector.num_set);
free_str_set(&env.subtest_selector.blacklist);
free_str_set(&env.subtest_selector.whitelist);
free(env.subtest_selector.num_set);
close(env.saved_netns_fd);
if (env.succ_cnt + env.fail_cnt + env.skip_cnt == 0)
return EXIT_NO_TEST;
return env.fail_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
}
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