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selftests/bpf: Test libbpf's ringbuf size fix up logic 

Make sure we always excercise libbpf's ringbuf map size adjustment logic
by specifying non-zero size that's definitely not a page size multiple.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220509004148.1801791-10-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2022-05-08 17:41:48 -07:00 committed by Daniel Borkmann
parent 0087a681fa
commit 7b3a063824
2 changed files with 2 additions and 12 deletions
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12
tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c
View File

@ -50,18 +50,6 @@ void test_ringbuf_multi(void)
if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
return;
err = bpf_map__set_max_entries(skel->maps.ringbuf1, page_size);
if (CHECK(err != 0, "bpf_map__set_max_entries", "bpf_map__set_max_entries failed\n"))
goto cleanup;
err = bpf_map__set_max_entries(skel->maps.ringbuf2, page_size);
if (CHECK(err != 0, "bpf_map__set_max_entries", "bpf_map__set_max_entries failed\n"))
goto cleanup;
err = bpf_map__set_max_entries(bpf_map__inner_map(skel->maps.ringbuf_arr), page_size);
if (CHECK(err != 0, "bpf_map__set_max_entries", "bpf_map__set_max_entries failed\n"))
goto cleanup;
proto_fd = bpf_map_create(BPF_MAP_TYPE_RINGBUF, NULL, 0, 0, page_size, NULL);
if (CHECK(proto_fd < 0, "bpf_map_create", "bpf_map_create failed\n"))
goto cleanup;

2
tools/testing/selftests/bpf/progs/test_ringbuf_multi.c
View File

@ -15,6 +15,8 @@ struct sample {
struct ringbuf_map {
__uint(type, BPF_MAP_TYPE_RINGBUF);
/* libbpf will adjust to valid page size */
__uint(max_entries, 1000);
} ringbuf1 SEC(".maps"),
ringbuf2 SEC(".maps");