From: Andrii Nakryiko <andrii@kernel.org>
Date: Sun, 8 May 2022 17:41:48 -0700
Subject: selftests/bpf: Test libbpf's ringbuf size fix up logic
Patch-mainline: v5.19-rc1
Git-commit: 7b3a06382442c4d83c9d35253638cb3f561da9b9
References: jsc#PED-1377

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
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c |   12 ------------
 tools/testing/selftests/bpf/progs/test_ringbuf_multi.c |    2 ++
 2 files changed, 2 insertions(+), 12 deletions(-)

--- a/tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c
+++ b/tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c
@@ -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;
--- a/tools/testing/selftests/bpf/progs/test_ringbuf_multi.c
+++ b/tools/testing/selftests/bpf/progs/test_ringbuf_multi.c
@@ -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");