selftests/bpf: Report failed subtest count in test_progs summary

The final summary line is asymmetric: the PASSED field reports both the
number of top-level tests and the number of subtests within them, while
the FAILED field reports only top-level tests:

  Summary: 640/5750 PASSED, 7760 SKIPPED, 100 FAILED

There is no way to tell whether those 100 failing tests amount to 100
broken subtests or 1000. So count subtests with a non-zero error_cnt
into a new sub_fail_cnt and print it alongside fail_cnt:

  Summary: 640/5750 PASSED, 7760 SKIPPED, 100/342 FAILED
                                             ^^^^^

This is correct for -j runs, as subtest_states[] is populated both in
sequential and parallel modes.

A test that fails without declaring any subtests contributes 0 to
sub_fail_cnt. That mirrors the existing behaviour of sub_succ_cnt for
tests that pass without subtests, keeping the two numerators
comparable.

Also emit the new count as a "failed_subtest" field in the JSON output,
for parity with the existing "success_subtest".

Note that this changes the trailing field of the summary line from a bare
integer to "A/B", so anything scraping "N FAILED" out of it needs updating.
While here, fix the fail_cnt comment in struct test_env, which claims it
counts "total failed tests + sub-tests".

Signed-off-by: Vineet Gupta <vineet.gupta@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20260807204434.1036279-4-vineet.gupta@linux.dev

0 files changed, 0 insertions, 0 deletions