netdev - [PATCH bpf-next v5 00/10] BTF: BPF Type Format

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Message-ID: <20180418225606.2771620-1-kafai@fb.com>
Date:   Wed, 18 Apr 2018 15:55:56 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: [PATCH bpf-next v5 00/10] BTF: BPF Type Format

This patch introduces BPF Type Format (BTF).

BTF (BPF Type Format) is the meta data format which describes
the data types of BPF program/map.  Hence, it basically focus
on the C programming language which the modern BPF is primary
using.  The first use case is to provide a generic pretty print
capability for a BPF map.

A modified pahole that can convert dwarf to BTF is here:
https://github.com/iamkafai/pahole/tree/btf
(Arnaldo, there is some BTF_KIND numbering changes on
 Apr 18th, d61426c1571)

Please see individual patch for details.

v5:
- Remove BTF_KIND_FLOAT and BTF_KIND_FUNC which are not
  currently used.  They can be added in the future.
  Some bpf_df_xxx() are removed together.
- Add comment in patch 7 to clarify that the new bpffs_map_fops
  should not be extended further.

v4:
- Fix warning (remove unneeded semicolon)
- Remove a redundant variable (nr_bytes) from btf_int_check_meta() in
  patch 1.  Caught by W=1.

v3:
- Rebase to bpf-next
- Fix sparse warning (by adding static)
- Add BTF header logging: btf_verifier_log_hdr()
- Fix the alignment test on btf->type_off
- Add tests for the BTF header
- Lower the max BTF size to 16MB.  It should be enough
  for some time.  We could raise it later if it would
  be needed.

v2:
- Use kvfree where needed in patch 1 and 2
- Also consider BTF_INT_OFFSET() in the btf_int_check_meta()
  in patch 1
- Fix an incorrect goto target in map_create() during
  the btf-error-path in patch 7
- re-org some local vars to keep the rev xmas tree in btf.c

Martin KaFai Lau (10):
  bpf: btf: Introduce BPF Type Format (BTF)
  bpf: btf: Validate type reference
  bpf: btf: Check members of struct/union
  bpf: btf: Add pretty print capability for data with BTF type info
  bpf: btf: Add BPF_BTF_LOAD command
  bpf: btf: Add BPF_OBJ_GET_INFO_BY_FD support to BTF fd
  bpf: btf: Add pretty print support to the basic arraymap
  bpf: btf: Sync bpf.h and btf.h to tools/
  bpf: btf: Add BTF support to libbpf
  bpf: btf: Add BTF tests

 include/linux/bpf.h                          |   20 +-
 include/linux/btf.h                          |   48 +
 include/uapi/linux/bpf.h                     |   12 +
 include/uapi/linux/btf.h                     |  130 ++
 kernel/bpf/Makefile                          |    1 +
 kernel/bpf/arraymap.c                        |   50 +
 kernel/bpf/btf.c                             | 2064 ++++++++++++++++++++++++++
 kernel/bpf/inode.c                           |  156 +-
 kernel/bpf/syscall.c                         |   51 +-
 tools/include/uapi/linux/bpf.h               |   12 +
 tools/include/uapi/linux/btf.h               |  130 ++
 tools/lib/bpf/Build                          |    2 +-
 tools/lib/bpf/bpf.c                          |   92 +-
 tools/lib/bpf/bpf.h                          |   16 +
 tools/lib/bpf/btf.c                          |  374 +++++
 tools/lib/bpf/btf.h                          |   22 +
 tools/lib/bpf/libbpf.c                       |  148 +-
 tools/lib/bpf/libbpf.h                       |    3 +
 tools/testing/selftests/bpf/Makefile         |   26 +-
 tools/testing/selftests/bpf/test_btf.c       | 1669 +++++++++++++++++++++
 tools/testing/selftests/bpf/test_btf_haskv.c |   48 +
 tools/testing/selftests/bpf/test_btf_nokv.c  |   43 +
 22 files changed, 5076 insertions(+), 41 deletions(-)
 create mode 100644 include/linux/btf.h
 create mode 100644 include/uapi/linux/btf.h
 create mode 100644 kernel/bpf/btf.c
 create mode 100644 tools/include/uapi/linux/btf.h
 create mode 100644 tools/lib/bpf/btf.c
 create mode 100644 tools/lib/bpf/btf.h
 create mode 100644 tools/testing/selftests/bpf/test_btf.c
 create mode 100644 tools/testing/selftests/bpf/test_btf_haskv.c
 create mode 100644 tools/testing/selftests/bpf/test_btf_nokv.c

-- 
2.9.5