linux-kernel - [PATCH v4 4/4] selftests/bpf: Add tests for ring__consume_n and ring_buffer__consume

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Date: Sat,  6 Apr 2024 11:15:44 +0200
From: Andrea Righi <andrea.righi@...onical.com>
To: Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	David Vernet <void@...ifault.com>,
	Tejun Heo <tj@...nel.org>,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/4] selftests/bpf: Add tests for ring__consume_n and ring_buffer__consume_n

Add tests for new API ring__consume_n() and ring_buffer__consume_n().

Signed-off-by: Andrea Righi <andrea.righi@...onical.com>
---
 tools/testing/selftests/bpf/prog_tests/ringbuf.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/ringbuf.c b/tools/testing/selftests/bpf/prog_tests/ringbuf.c
index 48c5695b7abf..33aba7684ab9 100644
--- a/tools/testing/selftests/bpf/prog_tests/ringbuf.c
+++ b/tools/testing/selftests/bpf/prog_tests/ringbuf.c
@@ -304,10 +304,18 @@ static void ringbuf_subtest(void)
 	err = ring_buffer__consume(ringbuf);
 	CHECK(err < 0, "rb_consume", "failed: %d\b", err);
 
+	/* try to consume up to one item */
+	err = ring_buffer__consume_n(ringbuf, 1);
+	CHECK(err < 0 || err > 1, "rb_consume_n", "failed: %d\b", err);
+
 	/* also consume using ring__consume to make sure it works the same */
 	err = ring__consume(ring);
 	ASSERT_GE(err, 0, "ring_consume");
 
+	/* try to consume up to one item */
+	err = ring__consume_n(ring, 1);
+	CHECK(err < 0 || err > 1, "ring_consume_n", "failed: %d\b", err);
+
 	/* 3 rounds, 2 samples each */
 	cnt = atomic_xchg(&sample_cnt, 0);
 	CHECK(cnt != 6, "cnt", "exp %d samples, got %d\n", 6, cnt);
-- 
2.43.0