[RFC PATCH bpf-next v2 6/6] selftests/bpf: Add cases to test map create failure log

[Leon Hwang <leon.hwang@linux.dev>]

As kernel is able to report log when fail to create map, add test cases
to check those logs.

cd tools/testing/selftests/bpf
./test_progs -t map_create_failure
191/1   map_create_failure/invalid_vmlinux_value_type_id:OK
191/2   map_create_failure/invalid_value_type_id:OK
191/3   map_create_failure/invalid_map_extra:OK
191/4   map_create_failure/invalid_numa_node:OK
191/5   map_create_failure/invalid_map_type:OK
191/6   map_create_failure/invalid_token_fd:OK
191/7   map_create_failure/invalid_map_name:OK
191/8   map_create_failure/invalid_btf_fd:OK
191     map_create_failure:OK
Summary: 1/8 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
 .../selftests/bpf/prog_tests/map_init.c       | 124 ++++++++++++++++++
 1 file changed, 124 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/map_init.c b/tools/testing/selftests/bpf/prog_tests/map_init.c
index 14a31109dd0e0..ee7c73f5700c9 100644
--- a/tools/testing/selftests/bpf/prog_tests/map_init.c
+++ b/tools/testing/selftests/bpf/prog_tests/map_init.c
@@ -212,3 +212,127 @@ void test_map_init(void)
 	if (test__start_subtest("pcpu_lru_map_init"))
 		test_pcpu_lru_map_init();
 }
+
+static void test_map_create(enum bpf_map_type map_type, const char *map_name,
+			    struct bpf_map_create_opts *opts, const char *exp_msg)
+{
+	char log_buf[128];
+	int fd;
+
+	log_buf[0] = '\0';
+	opts->log_buf = log_buf;
+	opts->log_size = sizeof(log_buf);
+	fd = bpf_map_create(map_type, map_name, 4, 4, 1, opts);
+	if (!ASSERT_LT(fd, 0, "bpf_map_create"))
+		goto out;
+
+	ASSERT_STREQ(log_buf, exp_msg, "unexpected log_buf");
+out:
+	if (fd >= 0)
+		close(fd);
+}
+
+static void test_map_create_simple(struct bpf_map_create_opts *opts, const char *exp_msg)
+{
+	test_map_create(BPF_MAP_TYPE_ARRAY, "test_map_create", opts, exp_msg);
+}
+
+static void test_invalid_vmlinux_value_type_id(void)
+{
+	const char *msg = "Invalid use of btf_vmlinux_value_type_id.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .btf_vmlinux_value_type_id = 1,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+static void test_invalid_value_type_id(void)
+{
+	const char *msg = "Invalid btf_value_type_id.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .btf_key_type_id = 1,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+static void test_invalid_map_extra(void)
+{
+	const char *msg = "Invalid map_extra.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .map_extra = 1,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+static void test_invalid_numa_node(void)
+{
+	const char *msg = "Invalid or offline numa_node.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .map_flags = BPF_F_NUMA_NODE,
+		    .numa_node = 0xFF,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+static void test_invalid_map_type(void)
+{
+	const char *msg = "Invalid map_type.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts);
+
+	test_map_create(__MAX_BPF_MAP_TYPE, "test_map_create", &opts, msg);
+}
+
+static void test_invalid_token_fd(void)
+{
+	const char *msg = "Invalid map_token_fd.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .map_flags = BPF_F_TOKEN_FD,
+		    .token_fd = 0xFF,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+static void test_invalid_map_name(void)
+{
+	const char *msg = "Invalid map_name.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts);
+
+	test_map_create(BPF_MAP_TYPE_ARRAY, "test-!@#", &opts, msg);
+}
+
+static void test_invalid_btf_fd(void)
+{
+	const char *msg = "Invalid btf_fd.\n";
+	LIBBPF_OPTS(bpf_map_create_opts, opts,
+		    .btf_fd = -1,
+		    .btf_key_type_id = 1,
+		    .btf_value_type_id = 1,
+	);
+
+	test_map_create_simple(&opts, msg);
+}
+
+void test_map_create_failure(void)
+{
+	if (test__start_subtest("invalid_vmlinux_value_type_id"))
+		test_invalid_vmlinux_value_type_id();
+	if (test__start_subtest("invalid_value_type_id"))
+		test_invalid_value_type_id();
+	if (test__start_subtest("invalid_map_extra"))
+		test_invalid_map_extra();
+	if (test__start_subtest("invalid_numa_node"))
+		test_invalid_numa_node();
+	if (test__start_subtest("invalid_map_type"))
+		test_invalid_map_type();
+	if (test__start_subtest("invalid_token_fd"))
+		test_invalid_token_fd();
+	if (test__start_subtest("invalid_map_name"))
+		test_invalid_map_name();
+	if (test__start_subtest("invalid_btf_fd"))
+		test_invalid_btf_fd();
+}
-- 
2.50.1