netdev - [PATCH RFC 0/2] bpf: add longest prefix match map

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Date:   Wed, 14 Dec 2016 16:43:34 +0100
From:   Daniel Mack <daniel@...que.org>
To:     ast@...com
Cc:     dh.herrmann@...il.com, daniel@...earbox.net,
        netdev@...r.kernel.org, davem@...emloft.net,
        Daniel Mack <daniel@...que.org>
Subject: [PATCH RFC 0/2] bpf: add longest prefix match map

This patch set adds longest prefix match algorithm that can be used to
match IP addresses to a stored set of ranges. It is exposed as a bpf
map type.

Internally, data is stored in an unbalanced tree of nodes that has a
maximum height of n, where n is the prefixlen the trie was created
with.

Not that this has nothing to do with fib or fib6 and is in no way meant
to replace or share code with it. It's rather a much simpler
implementation that is specifically written with bpf maps in mind.

Patch 1/2 adds the implementation, and 2/2 an extensive test suite.

Feedback is much appreciated.

Thanks,
Daniel

Daniel Mack (1):
  bpf: add a longest prefix match trie map implementation

David Herrmann (1):
  bpf: Add tests for the lpm trie map

 include/uapi/linux/bpf.h                   |   7 +
 kernel/bpf/Makefile                        |   2 +-
 kernel/bpf/lpm_trie.c                      | 491 +++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/.gitignore     |   1 +
 tools/testing/selftests/bpf/Makefile       |   4 +-
 tools/testing/selftests/bpf/test_lpm_map.c | 348 ++++++++++++++++++++
 6 files changed, 850 insertions(+), 3 deletions(-)
 create mode 100644 kernel/bpf/lpm_trie.c
 create mode 100644 tools/testing/selftests/bpf/test_lpm_map.c

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2.9.3