linux-kernel - Re: [PATCH bpf-next] selftests/bpf: make libbpf_probe_prog_types testcase aware of kernel configuration

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Message-ID: <Yz6DRTvnblwUR7dV@samus.usersys.redhat.com>
Date:   Thu, 6 Oct 2022 09:27:01 +0200
From:   Artem Savkov <asavkov@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jbenc@...hat.com
Subject: Re: [PATCH bpf-next] selftests/bpf: make libbpf_probe_prog_types
 testcase aware of kernel configuration

On Mon, Oct 03, 2022 at 05:03:18PM -0700, Andrii Nakryiko wrote:
> On Sun, Oct 2, 2022 at 11:56 PM Artem Savkov <asavkov@...hat.com> 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@...hat.com> 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@...hat.com>
> > > > ---
> > >
> > > 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@...hvm 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.
> #96/8    libbpf_probe_prog_types/BPF_PROG_TYPE_CGROUP_SKB:OK
> #96/14   libbpf_probe_prog_types/BPF_PROG_TYPE_SK_SKB:OK
> #96/16   libbpf_probe_prog_types/BPF_PROG_TYPE_SK_MSG:OK
> #96/21   libbpf_probe_prog_types/BPF_PROG_TYPE_SK_REUSEPORT:OK
> #96/30   libbpf_probe_prog_types/BPF_PROG_TYPE_SK_LOOKUP:OK
> #96      libbpf_probe_prog_types:OK
> 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.

Right, didn't know it can do that. Thanks for the pointer.

-- 
 Artem