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selftests/bpf: test eager BPF ringbuf size adjustment logic

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Add test validating that libbpf adjusts (and reflects adjusted) ringbuf
size early, before bpf_object is loaded. Also make sure we can't
successfully resize ringbuf map after bpf_object is loaded.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220715230952.2219271-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2022-07-15 16:09:52 -07:00 committed by Alexei Starovoitov
parent 597fbc4682
commit e134601961
1 changed files with 11 additions and 0 deletions
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11
tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c
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@ -50,6 +50,13 @@ void test_ringbuf_multi(void)
if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
return;
/* validate ringbuf size adjustment logic */
ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), page_size, "rb1_size_before");
ASSERT_OK(bpf_map__set_max_entries(skel->maps.ringbuf1, page_size + 1), "rb1_resize");
ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), 2 * page_size, "rb1_size_after");
ASSERT_OK(bpf_map__set_max_entries(skel->maps.ringbuf1, page_size), "rb1_reset");
ASSERT_EQ(bpf_map__max_entries(skel->maps.ringbuf1), page_size, "rb1_size_final");
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;
@ -65,6 +72,10 @@ void test_ringbuf_multi(void)
close(proto_fd);
proto_fd = -1;
/* make sure we can't resize ringbuf after object load */
if (!ASSERT_ERR(bpf_map__set_max_entries(skel->maps.ringbuf1, 3 * page_size), "rb1_resize_after_load"))
goto cleanup;
/* only trigger BPF program for current process */
skel->bss->pid = getpid();