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selftests/bpf: Add tests to verify map create failure log

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Add tests to verify that the kernel reports the expected error messages
and correct log_true_size when map creation fails.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260512153157.28382-9-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Leon Hwang 2026-05-12 23:31:57 +08:00 committed by Alexei Starovoitov
parent 702259006f
commit f675483cac
1 changed files with 166 additions and 0 deletions
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166
tools/testing/selftests/bpf/prog_tests/map_init.c
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@ -212,3 +212,169 @@ 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)
{
const int key_size = 4, value_size = 4, max_entries = 1;
char log_buf[128];
int fd;
LIBBPF_OPTS(bpf_log_opts, log_opts);
log_buf[0] = '\0';
log_opts.buf = log_buf;
log_opts.size = sizeof(log_buf);
log_opts.level = 1;
opts->log_opts = &log_opts;
fd = bpf_map_create(map_type, map_name, key_size, value_size, max_entries, opts);
if (!ASSERT_LT(fd, 0, "bpf_map_create")) {
close(fd);
return;
}
ASSERT_STREQ(log_buf, exp_msg, "log_buf");
ASSERT_EQ(log_opts.true_size, strlen(exp_msg) + 1, "true_size");
}
static void test_map_create_array(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_struct_ops(void)
{
const char *msg = "btf_vmlinux_value_type_id can only be used with struct_ops maps.\n";
LIBBPF_OPTS(bpf_map_create_opts, opts,
.btf_vmlinux_value_type_id = 1,
);
test_map_create_array(&opts, msg);
}
static void test_invalid_vmlinux_value_type_id_kv_type_id(void)
{
const char *msg = "btf_vmlinux_value_type_id is mutually exclusive with btf_key_type_id and btf_value_type_id.\n";
LIBBPF_OPTS(bpf_map_create_opts, opts,
.btf_vmlinux_value_type_id = 1,
.btf_key_type_id = 1,
);
test_map_create(BPF_MAP_TYPE_STRUCT_OPS, "test_map_create", &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_array(&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_array(&opts, msg);
}
static void test_invalid_numa_node(void)
{
const char *msg = "Invalid numa_node.\n";
LIBBPF_OPTS(bpf_map_create_opts, opts,
.map_flags = BPF_F_NUMA_NODE,
.numa_node = 0xFF,
);
test_map_create_array(&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_array(&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_array(&opts, msg);
}
static void test_excl_prog_hash_size_1(void)
{
const char *msg = "Invalid excl_prog_hash_size.\n";
const char *hash = "DEADCODE";
LIBBPF_OPTS(bpf_map_create_opts, opts,
.excl_prog_hash = hash,
);
test_map_create_array(&opts, msg);
}
static void test_excl_prog_hash_size_2(void)
{
const char *msg = "Invalid excl_prog_hash_size.\n";
LIBBPF_OPTS(bpf_map_create_opts, opts,
.excl_prog_hash_size = 1,
);
test_map_create_array(&opts, msg);
}
void test_map_create_failure(void)
{
if (test__start_subtest("invalid_vmlinux_value_type_id_struct_ops"))
test_invalid_vmlinux_value_type_id_struct_ops();
if (test__start_subtest("invalid_vmlinux_value_type_id_kv_type_id"))
test_invalid_vmlinux_value_type_id_kv_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();
if (test__start_subtest("invalid_excl_prog_hash_size_1"))
test_excl_prog_hash_size_1();
if (test__start_subtest("invalid_excl_prog_hash_size_2"))
test_excl_prog_hash_size_2();
}