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selftest/bpf: Add map_in_maps with BPF_MAP_TYPE_PERF_EVENT_ARRAY values

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Check that bpf_object__load() successfully creates map_in_maps
with BPF_MAP_TYPE_PERF_EVENT_ARRAY values.
These changes cover fix in the previous patch
"libbpf: Apply map_set_def_max_entries() for inner_maps on creation".

A command line output is:
- w/o fix
$ sudo ./test_maps
libbpf: map 'mim_array_pe': failed to create inner map: -22
libbpf: map 'mim_array_pe': failed to create: Invalid argument(-22)
libbpf: failed to load object './test_map_in_map.bpf.o'
Failed to load test prog

- with fix
$ sudo ./test_maps
...
test_maps: OK, 0 SKIPPED

Fixes: 646f02ffdd49 ("libbpf: Add BTF-defined map-in-map support")
Signed-off-by: Andrey Grafin <conquistador@yandex-team.ru>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/bpf/20240117130619.9403-2-conquistador@yandex-team.ru
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrey Grafin 2024-01-17 16:06:19 +03:00 committed by Alexei Starovoitov
parent f04deb90e5
commit 40628f9fff
2 changed files with 31 additions and 1 deletions
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26
tools/testing/selftests/bpf/progs/test_map_in_map.c
View File

@ -21,6 +21,32 @@ struct {
__type(value, __u32);
} mim_hash SEC(".maps");
/* The following three maps are used to test
* perf_event_array map can be an inner
* map of hash/array_of_maps.
*/
struct perf_event_array {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__type(key, __u32);
__type(value, __u32);
} inner_map0 SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
__uint(max_entries, 1);
__type(key, __u32);
__array(values, struct perf_event_array);
} mim_array_pe SEC(".maps") = {
.values = {&inner_map0}};
struct {
__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
__uint(max_entries, 1);
__type(key, __u32);
__array(values, struct perf_event_array);
} mim_hash_pe SEC(".maps") = {
.values = {&inner_map0}};
SEC("xdp")
int xdp_mimtest0(struct xdp_md *ctx)
{

6
tools/testing/selftests/bpf/test_maps.c
View File

@ -1190,7 +1190,11 @@ static void test_map_in_map(void)
goto out_map_in_map;
}
bpf_object__load(obj);
err = bpf_object__load(obj);
if (err) {
printf("Failed to load test prog\n");
goto out_map_in_map;
}
map = bpf_object__find_map_by_name(obj, "mim_array");
if (!map) {