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libbpf: Fix ring_buffer__poll() to return number of consumed samples

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Fix ring_buffer__poll() to return the number of non-discarded records
consumed, just like its documentation states. It's also consistent with
ring_buffer__consume() return. Fix up selftests with wrong expected results.

Fixes: bf99c936f9 ("libbpf: Add BPF ring buffer support")
Fixes: cb1c9ddd55 ("selftests/bpf: Add BPF ringbuf selftests")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201130223336.904192-1-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2020-11-30 14:33:35 -08:00 committed by Alexei Starovoitov
parent ed1182dc00
commit f6a8250ea1
3 changed files with 3 additions and 3 deletions
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2
tools/lib/bpf/ringbuf.c
View File

@ -278,7 +278,7 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
err = ringbuf_process_ring(ring);
if (err < 0)
return err;
res += cnt;
res += err;
}
return cnt < 0 ? -errno : res;
}

2
tools/testing/selftests/bpf/prog_tests/ringbuf.c
View File

@ -217,7 +217,7 @@ void test_ringbuf(void)
if (CHECK(err, "join_bg", "err %d\n", err))
goto cleanup;
if (CHECK(bg_ret != 1, "bg_ret", "epoll_wait result: %ld", bg_ret))
if (CHECK(bg_ret <= 0, "bg_ret", "epoll_wait result: %ld", bg_ret))
goto cleanup;
/* 3 rounds, 2 samples each */

2
tools/testing/selftests/bpf/prog_tests/ringbuf_multi.c
View File

@ -81,7 +81,7 @@ void test_ringbuf_multi(void)
/* poll for samples, should get 2 ringbufs back */
err = ring_buffer__poll(ringbuf, -1);
if (CHECK(err != 4, "poll_res", "expected 4 records, got %d\n", err))
if (CHECK(err != 2, "poll_res", "expected 2 records, got %d\n", err))
goto cleanup;
/* expect extra polling to return nothing */