linux-kernel - Re: [PATCH bpf-next v3 0/3] Add more bpf_*_ct

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Date:   Thu, 11 Aug 2022 02:25:51 +0200
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     Daniel Xu <dxu@...uu.xyz>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, fw@...len.de,
        "toke@...hat.com" <toke@...hat.com>
Subject: Re: [PATCH bpf-next v3 0/3] Add more bpf_*_ct_lookup() selftests

On Thu, 11 Aug 2022 at 01:16, Daniel Xu <dxu@...uu.xyz> wrote:
>
> This patchset adds more bpf_*_ct_lookup() selftests. The goal is to test
> interaction with netfilter subsystem as well as reading from `struct
> nf_conn`. The first is important when migrating legacy systems towards
> bpf. The latter is important in general to take full advantage of
> connection tracking.
>

Thank you for contributing these tests. Feel free to add:
Acked-by: Kumar Kartikeya Dwivedi <memxor@...il.com>

People often look at selftests for usage examples these days, so it's
great to have coverage + examples for more use cases.

> I'll follow this patchset up with support for writing to `struct nf_conn`.
>

Please also cc netfilter-devel, netdev, Pablo, and Florian when you send it.

I think we can directly enable stores to ct->mark, since that is what
ctnetlink is doing too, so adding another helper for this would be
unnecessary overhead.


> Past discussion:
> - v2: https://lore.kernel.org/bpf/cover.1660062725.git.dxu@dxuuu.xyz/
> - v1: https://lore.kernel.org/bpf/cover.1659209738.git.dxu@dxuuu.xyz/
>
> Changes since v2:
> - Add bpf-ci kconfig changes
>
> Changes since v1:
> - Reword commit message / cover letter to not mention connmark writing
>
>
> Daniel Xu (3):
>   selftests/bpf: Add existing connection bpf_*_ct_lookup() test
>   selftests/bpf: Add connmark read test
>   selftests/bpf: Update CI kconfig
>
>  tools/testing/selftests/bpf/config            |  2 +
>  .../testing/selftests/bpf/prog_tests/bpf_nf.c | 60 +++++++++++++++++++
>  .../testing/selftests/bpf/progs/test_bpf_nf.c | 21 +++++++
>  3 files changed, 83 insertions(+)
>
> --
> 2.37.1
>