linux/tools/testing/selftests/bpf/test_progs.c

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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
*/
#include "test_progs.h"
#include "bpf_rlimit.h"
#include <argp.h>
#include <string.h>
/* 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;
const char *subtest_name;
int subtest_num;
/* store counts before subtest started */
int old_error_cnt;
};
static bool should_run(struct test_selector *sel, int num, const char *name)
{
if (sel->name && sel->name[0] && !strstr(name, sel->name))
return false;
if (!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.verbose || 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;
}
}
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");
}
bool test__start_subtest(const char *name)
{
struct prog_test_def *test = env.test;
if (test->subtest_name) {
test__end_subtest();
test->subtest_name = NULL;
}
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 = name;
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++;
}
struct ipv4_packet pkt_v4 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = IPPROTO_TCP,
.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
struct ipv6_packet pkt_v6 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
.iph.nexthdr = IPPROTO_TCP,
.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
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) {
printf("%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';
return 0;
err:
fclose(fp);
return -1;
}
void *spin_lock_thread(void *arg)
{
__u32 duration, retval;
int err, prog_fd = *(u32 *) arg;
err = bpf_prog_test_run(prog_fd, 10000, &pkt_v4, sizeof(pkt_v4),
NULL, NULL, &retval, &duration);
CHECK(err || retval, "",
"err %d errno %d retval %d duration %d\n",
err, errno, retval, duration);
pthread_exit(arg);
}
/* extern declarations for test funcs */
#define DEFINE_TEST(name) extern void test_##name();
#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_VERIFIER_STATS = 's',
ARG_VERBOSE = 'v',
};
static const struct argp_option opts[] = {
{ "num", ARG_TEST_NUM, "NUM", 0,
"Run test number NUM only " },
{ "name", ARG_TEST_NAME, "NAME", 0,
"Run tests with names containing NAME" },
{ "verifier-stats", ARG_VERIFIER_STATS, NULL, 0,
"Output verifier statistics", },
{ "verbose", ARG_VERBOSE, "LEVEL", OPTION_ARG_OPTIONAL,
"Verbose output (use -vv for extra verbose output)" },
{},
};
static int libbpf_print_fn(enum libbpf_print_level level,
const char *format, va_list args)
{
if (!env.very_verbose && level == LIBBPF_DEBUG)
return 0;
vprintf(format, args);
return 0;
}
int parse_num_list(const char *s, struct test_selector *sel)
{
int i, set_len = 0, num, start = 0, end = -1;
bool *set = NULL, *tmp, parsing_end = false;
char *next;
while (s[0]) {
errno = 0;
num = strtol(s, &next, 10);
if (errno)
return -errno;
if (parsing_end)
end = num;
else
start = num;
if (!parsing_end && *next == '-') {
s = next + 1;
parsing_end = true;
continue;
} else if (*next == ',') {
parsing_end = false;
s = next + 1;
end = num;
} else if (*next == '\0') {
parsing_end = false;
s = next;
end = num;
} else {
return -EINVAL;
}
if (start > end)
return -EINVAL;
if (end + 1 > set_len) {
set_len = end + 1;
tmp = realloc(set, set_len);
if (!tmp) {
free(set);
return -ENOMEM;
}
set = tmp;
}
for (i = start; i <= end; i++) {
set[i] = true;
}
}
if (!set)
return -EINVAL;
sel->num_set = set;
sel->num_set_len = set_len;
return 0;
}
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)) {
fprintf(stderr,
"Failed to parse subtest numbers.\n");
return -EINVAL;
}
}
if (parse_num_list(arg, &env->test_selector)) {
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';
env->subtest_selector.name = strdup(subtest_str + 1);
if (!env->subtest_selector.name)
return -ENOMEM;
}
env->test_selector.name = strdup(arg);
if (!env->test_selector.name)
return -ENOMEM;
break;
}
case ARG_VERIFIER_STATS:
env->verifier_stats = true;
break;
case ARG_VERBOSE:
if (arg) {
if (strcmp(arg, "v") == 0) {
env->very_verbose = true;
} else {
fprintf(stderr,
"Unrecognized verbosity setting ('%s'), only -v and -vv are supported\n",
arg);
return -EINVAL;
}
}
env->verbose = 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.verbose) {
/* 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
}
int main(int argc, char **argv)
{
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
int err, i;
err = argp_parse(&argp, argc, argv, 0, NULL, &env);
if (err)
return err;
libbpf_set_print(libbpf_print_fn);
srand(time(NULL));
env.jit_enabled = is_jit_enabled();
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;
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");
}
stdio_restore();
printf("Summary: %d/%d PASSED, %d SKIPPED, %d FAILED\n",
env.succ_cnt, env.sub_succ_cnt, env.skip_cnt, env.fail_cnt);
free(env.test_selector.num_set);
free(env.subtest_selector.num_set);
return env.fail_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
}