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>
---
 lib/test_bpf.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index d500320778c7..baff847a02da 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c

@@ -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 &&