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bpf/tests: Do not PASS tests without actually testing the result

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[ Upstream commit 2b7e9f25e5 ]

Each test case can have a set of sub-tests, where each sub-test can
run the cBPF/eBPF test snippet with its own data_size and expected
result. Before, the end of the sub-test array was indicated by both
data_size and result being zero. However, most or all of the internal
eBPF tests has a data_size of zero already. When such a test also had
an expected value of zero, the test was never run but reported as
PASS anyway.

Now the test runner always runs the first sub-test, regardless of the
data_size and result values. The sub-test array zero-termination only
applies for any additional sub-tests.

There are other ways fix it of course, but this solution at least
removes the surprise of eBPF tests with a zero result always succeeding.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210721103822.3755111-1-johan.almbladh@anyfinetworks.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johan Almbladh 2021-07-21 12:38:22 +02:00 • committed by Greg Kroah-Hartman
parent 620a0d0b97
commit 55bd26b7fe
1 changed files with 8 additions and 1 deletions
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9
lib/test_bpf.c
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@ -6659,7 +6659,14 @@ static int run_one(const struct bpf_prog *fp, struct bpf_test *test)
u64 duration;
u32 ret;
if (test->test[i].data_size == 0 &&
/*
* NOTE: Several sub-tests may be present, in which case
* a zero {data_size, result} tuple indicates the end of
* the sub-test array. The first test is always run,
* even if both data_size and result happen to be zero.
*/
if (i > 0 &&
test->test[i].data_size == 0 &&
test->test[i].result == 0)
break;