Re: [PATCH bpf-next] selftests/bpf: make libbpf_probe_prog_types testcase aware of kernel configuration
From: Andrii Nakryiko
Date: Mon Oct 03 2022 - 20:03:46 EST
On Sun, Oct 2, 2022 at 11:56 PM Artem Savkov <asavkov@xxxxxxxxxx> wrote:
> On Fri, Sep 30, 2022 at 04:06:41PM -0700, Andrii Nakryiko wrote:
> > On Fri, Sep 30, 2022 at 4:09 AM Artem Savkov <asavkov@xxxxxxxxxx> wrote:
> > >
> > > At the moment libbpf_probe_prog_types test iterates over all available
> > > BPF_PROG_TYPE regardless of kernel configuration which can exclude some
> > > of those. Unfortunately there is no direct way to tell which types are
> > > available, but we can look at struct bpf_ctx_onvert to tell which ones
> > > are available.
> > >
> > > Signed-off-by: Artem Savkov <asavkov@xxxxxxxxxx>
> > > ---
> > Many selftests assume correct kernel configuration which is encoded in
> > config and config.<arch> files. So it seems fair to assume that all
> > defined program types are available on kernel-under-test.
> Ok. Wasn't sure if this is the assumption being made.
> > If someone is running selftests under custom more minimal kernel they
> > can use denylist to ignore specific prog type subtests?
> Thanks for the suggestion. Denylist is a bit too broad in this case as
> it means we'll be disabling the whole libbpf_probe_prog_types test while
> only a single type is a problem. Looks like we'll have to live with a
> downstream-only patch in this case.
Allow/deny lists allow to specify subtests as well, so you can have
very granular control. E.g.,
[vmuser@archvm bpf]$ sudo ./test_progs -a 'libbpf_probe_prog_types/*SK*'
Failed to load bpf_testmod.ko into the kernel: -22
WARNING! Selftests relying on bpf_testmod.ko will be skipped.
Summary: 1/5 PASSED, 0 SKIPPED, 0 FAILED
As you can see each program type is a subtest, so you can pick and
choose which ones to run.