linux-kernel - Re: [PATCH bpf-next v10 01/23] selftests/bpf: regroup and declare similar kfuncs selftests in an array

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Date:   Tue, 6 Sep 2022 05:27:14 +0200
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH bpf-next v10 01/23] selftests/bpf: regroup and declare
 similar kfuncs selftests in an array

On Tue, 6 Sept 2022 at 05:25, Kumar Kartikeya Dwivedi <memxor@...il.com> wrote:
>
> On Fri, 2 Sept 2022 at 15:29, Benjamin Tissoires
> <benjamin.tissoires@...hat.com> wrote:
> >
> > Similar to tools/testing/selftests/bpf/prog_tests/dynptr.c:
> > we declare an array of tests that we run one by one in a for loop.
> >
> > Followup patches will add more similar-ish tests, so avoid a lot of copy
> > paste by grouping the declaration in an array.
> >
> > To be able to call bpf_object__find_program_by_name(), we need to use
> > plain libbpf calls, and not light skeletons. So also change the Makefile
> > to not generate light skeletons.
> >
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> >
> > ---
>
> I see your point, but this is also a test so that we keep verifying
> kfunc call in light skeleton.
> Code for relocating both is different in libbpf (we generate BPF ASM
> for light skeleton so it is done inside a loader BPF program instead
> of userspace).

Err, hit send too early.
We can probably use a macro to hide how program is called, then do
X(prog1)
X(prog2)
in a series, won't look too bad and avoids duplication at the same time.

> You might then be able to make it work for both light and normal skeleton.
>
WDYT?