netdev - Re: [PATCH bpf-next v2 0/5] support flow dissector in BPF_PROG_TEST

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Date:   Wed, 5 Dec 2018 09:55:59 -0800
From:   Song Liu <liu.song.a23@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Networking <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        simon.horman@...ronome.com
Subject: Re: [PATCH bpf-next v2 0/5] support flow dissector in BPF_PROG_TEST_RUN

On Mon, Dec 3, 2018 at 8:01 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> This patch series adds support for testing flow dissector BPF programs by
> extending already existing BPF_PROG_TEST_RUN. The goal is to have a
> packet as an input and `struct bpf_flow_key' as an output. That way
> we can easily test flow dissector programs' behavior.
> I've also modified existing test_progs.c test to do a simple flow
> dissector run as well.
>
> * first patch introduces new __skb_flow_bpf_dissect to simplify
>   sharing between __skb_flow_bpf_dissect and BPF_PROG_TEST_RUN
> * second patch adds actual BPF_PROG_TEST_RUN support
> * third patch converts BPF flow dissector to thoff
> * forth patch correctly caps nhoff and thoff returned from bpf flow
>   dissector
> * fifth patch adds example usage to the selftests
>
> v2 changes:
>
> * new patch to use thoff instead of nhoff in bpf flow dissector
> * new patch to correctly cap thoff for BPF case
> * add missing memset(flow_keys, 0, ...) to __skb_flow_bpf_dissect
> * set test iterations to 10
>
> Stanislav Fomichev (5):
>   net/flow_dissector: move bpf case into __skb_flow_bpf_dissect
>   bpf: add BPF_PROG_TEST_RUN support for flow dissector
>   selftests/bpf: use thoff instead of nhoff in BPF flow dissector
>   net/flow_dissector: correctly cap nhoff and thoff in case of BPF
>   selftests/bpf: add simple BPF_PROG_TEST_RUN examples for flow
>     dissector
>
>  include/linux/bpf.h                           |  3 +
>  include/linux/skbuff.h                        |  5 ++
>  net/bpf/test_run.c                            | 71 ++++++++++++++-
>  net/core/filter.c                             |  1 +
>  net/core/flow_dissector.c                     | 88 ++++++++++++-------
>  tools/testing/selftests/bpf/Makefile          |  3 +
>  tools/testing/selftests/bpf/bpf_flow.c        | 36 ++++----
>  .../selftests/bpf/flow_dissector_load.c       | 43 ++-------
>  .../selftests/bpf/flow_dissector_load.h       | 55 ++++++++++++
>  tools/testing/selftests/bpf/test_progs.c      | 78 +++++++++++++++-
>  10 files changed, 289 insertions(+), 94 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/flow_dissector_load.h
>
> --
> 2.20.0.rc1.387.gf8505762e3-goog
>

For the series:

Acked-by: Song Liu <songliubraving@...com>