netdev - Re: [PATCH bpf-next 0/4] transition sockmap testing to test

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Message-ID: <CAEf4BzbkGuDH91X2KaA=448HoZD0m09qQrBDvBxFwdTLTF7JFw@mail.gmail.com>
Date: Wed, 24 Jan 2024 09:45:46 -0800
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: John Fastabend <john.fastabend@...il.com>
Cc: netdev@...r.kernel.org, jakub@...udflare.com, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/4] transition sockmap testing to test_progs

On Tue, Jan 23, 2024 at 6:35 PM John Fastabend <john.fastabend@...il.com> wrote:
>
> John Fastabend wrote:
> > Its much easier to write and read tests than it was when sockmap was
> > originally created. At that time we created a test_sockmap prog that
> > did sockmap tests. But, its showing its age now. For example it reads
> > user vars out of maps, is hard to run targetted tests, has a different
> > format from the familiar test_progs and so on.
> >
> > I recently thought there was an issue with pop helpers so I created
> > some tests to try and track it down. It turns out it was a bug in the
> > BPF program we had not the kernel. But, I think it makes sense to
> > start deprecating test_sockmap and converting these to the nicer
> > test_progs.
> >
> > So this is a first round of test_prog tests for sockmap cork and
> > pop helpers. I'll add push and pull tests shortly. I think its fine,
> > maybe preferred to review smaller patchsets, to send these
> > incrementally as I get them created.
> >
> > Thanks!
> >
> > John Fastabend (4):
> >   bpf: Add modern test for sk_msg prog pop msg header
> >   bpf: sockmap, add a sendmsg test so we can check that path
> >   bpf: sockmap, add a cork to force buffering of the scatterlist
> >   bpf: sockmap test cork and pop combined
> >
> >  .../bpf/prog_tests/sockmap_helpers.h          |  18 +
> >  .../bpf/prog_tests/sockmap_msg_helpers.c      | 351 ++++++++++++++++++
> >  .../bpf/progs/test_sockmap_msg_helpers.c      |  67 ++++
> >  3 files changed, 436 insertions(+)
> >  create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_msg_helpers.c
> >  create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_msg_helpers.c
> >
> > --
> > 2.33.0
> >
>
> Will need a v2 to fixup a couple things here. Thanks.
>

Can you please also try compiling selftests with `make RELEASE=1` and
making sure the compiler doesn't complain about uninitialized
variables and such. Unfortunately we don't do this automatically in CI
yet.