[Patch bpf-next v2 4/5] selftests/bpf: add a test case for bpf timeout map

[Cong Wang]

From: Cong Wang <cong.w...@bytedance.com>

Add a test case in test_maps.c for timeout map, which focuses
on testing timeout.

Cc: Alexei Starovoitov <a...@kernel.org>
Cc: Daniel Borkmann <dan...@iogearbox.net>
Cc: Dongdong Wang <wangdongdon...@bytedance.com>
Signed-off-by: Cong Wang <cong.w...@bytedance.com>
---
 tools/testing/selftests/bpf/test_maps.c | 41 +++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/tools/testing/selftests/bpf/test_maps.c 
b/tools/testing/selftests/bpf/test_maps.c
index 0ad3e6305ff0..9fc7b5424fdf 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -1723,6 +1723,45 @@ static void test_reuseport_array(void)
        close(map_fd);
 }
 
+static void test_timeout_map(void)
+{
+       int val1 = 1, val2 = 2, val3 = 3;
+       int key1 = 1, key2 = 2, key3 = 3;
+       int fd;
+
+       fd = bpf_create_map(BPF_MAP_TYPE_TIMEOUT_HASH, sizeof(int), sizeof(int),
+                           3, map_flags);
+       if (fd < 0) {
+               printf("Failed to create timeout map '%s'!\n", strerror(errno));
+               exit(1);
+       }
+
+       /* Timeout after 1 secs */
+       assert(bpf_map_update_elem(fd, &key1, &val1, (u64)1<<32) == 0);
+       /* Timeout after 2 secs */
+       assert(bpf_map_update_elem(fd, &key2, &val2, (u64)2<<32) == 0);
+       /* Timeout after 10 secs */
+       assert(bpf_map_update_elem(fd, &key3, &val3, (u64)10<<32) == 0);
+
+       sleep(1);
+       assert(bpf_map_lookup_elem(fd, &key1, &val1) != 0);
+       val2 = 0;
+       assert(bpf_map_lookup_elem(fd, &key2, &val2) == 0 && val2 == 2);
+
+       sleep(1);
+       assert(bpf_map_lookup_elem(fd, &key1, &val1) != 0);
+       assert(bpf_map_lookup_elem(fd, &key2, &val2) != 0);
+
+       /* Modify timeout to expire it earlier */
+       val3 = 0;
+       assert(bpf_map_lookup_elem(fd, &key3, &val3) == 0 && val3 == 3);
+       assert(bpf_map_update_elem(fd, &key3, &val3, (u64)1<<32) == 0);
+       sleep(1);
+       assert(bpf_map_lookup_elem(fd, &key3, &val3) != 0);
+
+       close(fd);
+}
+
 static void run_all_tests(void)
 {
        test_hashmap(0, NULL);
@@ -1752,6 +1791,8 @@ static void run_all_tests(void)
        test_stackmap(0, NULL);
 
        test_map_in_map();
+
+       test_timeout_map();
 }
 
 #define DEFINE_TEST(name) extern void test_##name(void);
-- 
2.25.1