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tools/bpf: add a multithreaded stress test in bpf selftests test_lpm_map

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The new test will spawn four threads, doing map update, delete, lookup
and get_next_key in parallel. It is able to reproduce the issue in the
previous commit found by syzbot and Eric Dumazet.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2018-01-26 15:06:08 -08:00 committed by Alexei Starovoitov
parent 6dd1ec6c7a
commit af32efeede
2 changed files with 96 additions and 1 deletions
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2
tools/testing/selftests/bpf/Makefile
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@ -11,7 +11,7 @@ ifneq ($(wildcard $(GENHDR)),)
endif
CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
LDLIBS += -lcap -lelf -lrt
LDLIBS += -lcap -lelf -lrt -lpthread
TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
test_align test_verifier_log test_dev_cgroup test_tcpbpf_user

95
tools/testing/selftests/bpf/test_lpm_map.c
View File

@ -14,6 +14,7 @@
#include <errno.h>
#include <inttypes.h>
#include <linux/bpf.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -641,6 +642,98 @@ static void test_lpm_get_next_key(void)
close(map_fd);
}
#define MAX_TEST_KEYS 4
struct lpm_mt_test_info {
int cmd; /* 0: update, 1: delete, 2: lookup, 3: get_next_key */
int iter;
int map_fd;
struct {
__u32 prefixlen;
__u32 data;
} key[MAX_TEST_KEYS];
};
static void *lpm_test_command(void *arg)
{
int i, j, ret, iter, key_size;
struct lpm_mt_test_info *info = arg;
struct bpf_lpm_trie_key *key_p;
key_size = sizeof(struct bpf_lpm_trie_key) + sizeof(__u32);
key_p = alloca(key_size);
for (iter = 0; iter < info->iter; iter++)
for (i = 0; i < MAX_TEST_KEYS; i++) {
/* first half of iterations in forward order,
* and second half in backward order.
*/
j = (iter < (info->iter / 2)) ? i : MAX_TEST_KEYS - i - 1;
key_p->prefixlen = info->key[j].prefixlen;
memcpy(key_p->data, &info->key[j].data, sizeof(__u32));
if (info->cmd == 0) {
__u32 value = j;
/* update must succeed */
assert(bpf_map_update_elem(info->map_fd, key_p, &value, 0) == 0);
} else if (info->cmd == 1) {
ret = bpf_map_delete_elem(info->map_fd, key_p);
assert(ret == 0 || errno == ENOENT);
} else if (info->cmd == 2) {
__u32 value;
ret = bpf_map_lookup_elem(info->map_fd, key_p, &value);
assert(ret == 0 || errno == ENOENT);
} else {
struct bpf_lpm_trie_key *next_key_p = alloca(key_size);
ret = bpf_map_get_next_key(info->map_fd, key_p, next_key_p);
assert(ret == 0 || errno == ENOENT || errno == ENOMEM);
}
}
// Pass successful exit info back to the main thread
pthread_exit((void *)info);
}
static void setup_lpm_mt_test_info(struct lpm_mt_test_info *info, int map_fd)
{
info->iter = 2000;
info->map_fd = map_fd;
info->key[0].prefixlen = 16;
inet_pton(AF_INET, "192.168.0.0", &info->key[0].data);
info->key[1].prefixlen = 24;
inet_pton(AF_INET, "192.168.0.0", &info->key[1].data);
info->key[2].prefixlen = 24;
inet_pton(AF_INET, "192.168.128.0", &info->key[2].data);
info->key[3].prefixlen = 24;
inet_pton(AF_INET, "192.168.1.0", &info->key[3].data);
}
static void test_lpm_multi_thread(void)
{
struct lpm_mt_test_info info[4];
size_t key_size, value_size;
pthread_t thread_id[4];
int i, map_fd;
void *ret;
/* create a trie */
value_size = sizeof(__u32);
key_size = sizeof(struct bpf_lpm_trie_key) + value_size;
map_fd = bpf_create_map(BPF_MAP_TYPE_LPM_TRIE, key_size, value_size,
100, BPF_F_NO_PREALLOC);
/* create 4 threads to test update, delete, lookup and get_next_key */
setup_lpm_mt_test_info(&info[0], map_fd);
for (i = 0; i < 4; i++) {
if (i != 0)
memcpy(&info[i], &info[0], sizeof(info[i]));
info[i].cmd = i;
assert(pthread_create(&thread_id[i], NULL, &lpm_test_command, &info[i]) == 0);
}
for (i = 0; i < 4; i++)
assert(pthread_join(thread_id[i], &ret) == 0 && ret == (void *)&info[i]);
close(map_fd);
}
int main(void)
{
struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY };
@ -667,6 +760,8 @@ int main(void)
test_lpm_get_next_key();
test_lpm_multi_thread();
printf("test_lpm: OK\n");
return 0;
}