linux-kernel - [PATCH v3 0/4] btf: support ints larger than 128 bits

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Date:   Tue,  5 Jan 2021 14:45:30 +0000
From:   Sean Young <sean@...s.org>
To:     Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Quentin Monnet <quentin@...valent.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        linux-doc@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH v3 0/4] btf: support ints larger than 128 bits

clang supports arbitrary length ints using the _ExtInt extension. This
can be useful to hold very large values, e.g. 256 bit or 512 bit types.

Larger types (e.g. 1024 bits) are possible but I am unaware of a use
case for these.

This requires the _ExtInt extension enabled in clang, which is under
review.

Link: https://clang.llvm.org/docs/LanguageExtensions.html#extended-integer-types
Link: https://reviews.llvm.org/D93103

Signed-off-by: Sean Young <sean@...s.org>

changes since v2:
 - split patches into 4 distinct patches

changes since v1:
 - added tests as suggested by Yonghong Song
 - added kernel pretty-printer


Sean Young (4):
  btf: add support for ints larger than 128 bits
  libbpf: add support for ints larger than 128 bits
  bpftool: add support for ints larger than 128 bits
  bpf: add tests for ints larger than 128 bits

 Documentation/bpf/btf.rst                     |   4 +-
 include/uapi/linux/btf.h                      |   2 +-
 kernel/bpf/btf.c                              |  54 +-
 tools/bpf/bpftool/btf_dumper.c                |  40 ++
 tools/include/uapi/linux/btf.h                |   2 +-
 tools/lib/bpf/btf.c                           |   2 +-
 tools/testing/selftests/bpf/Makefile          |   3 +-
 tools/testing/selftests/bpf/prog_tests/btf.c  |   3 +-
 .../selftests/bpf/progs/test_btf_extint.c     |  50 ++
 tools/testing/selftests/bpf/test_extint.py    | 535 ++++++++++++++++++
 10 files changed, 679 insertions(+), 16 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/test_btf_extint.c
 create mode 100755 tools/testing/selftests/bpf/test_extint.py

-- 
2.29.2