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

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Message-Id: <20181204040100.243614-1-sdf@google.com>
Date:   Mon,  3 Dec 2018 20:00:55 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        simon.horman@...ronome.com, liu.song.a23@...il.com,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v2 0/5] support flow dissector in BPF_PROG_TEST_RUN

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