netdev - [PATCH v6 bpf-next 0/9] bpf: Add d_path helper

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Date:   Fri, 10 Jul 2020 21:37:45 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v6 bpf-next 0/9] bpf: Add d_path helper - preparation changes

hi,
this patchset does preparation work for adding d_path helper,
which still needs more work, but the initial set of patches
is ready and useful to have.

This patchset adds:
  - support to generate BTF ID lists that are resolved during
    kernel linking and usable within kernel code with following
    macros:

      BTF_ID_LIST(bpf_skb_output_btf_ids)
      BTF_ID(struct, sk_buff)

    and access it in kernel code via:
      extern u32 bpf_skb_output_btf_ids[];

  - resolve_btfids tool that scans elf object for .BTF_ids
    section and resolves its symbols with BTF ID values
  - resolving of bpf_ctx_convert struct and several other
    objects with BTF_ID_LIST

v6 changes:
  - added acks
  - added general make rule to resolve_btfids Build [Andrii]
  - renamed .BTF.ids to .BTF_ids [Andrii]
  - added --no-fail option to resolve_btfids [Andrii]
  - changed resolve_btfids test to work over BTF from object
    file, so we don't depend on vmlinux BTF [Andrii]
  - fixed few typos [Andrii]
  - fixed the out of tree build [Andrii]

Also available at:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  bpf/d_path

thanks,
jirka


---
Jiri Olsa (9):
      bpf: Add resolve_btfids tool to resolve BTF IDs in ELF object
      bpf: Compile resolve_btfids tool at kernel compilation start
      bpf: Add BTF_ID_LIST/BTF_ID/BTF_ID_UNUSED macros
      bpf: Resolve BTF IDs in vmlinux image
      bpf: Remove btf_id helpers resolving
      bpf: Use BTF_ID to resolve bpf_ctx_convert struct
      bpf: Add info about .BTF_ids section to btf.rst
      tools headers: Adopt verbatim copy of btf_ids.h from kernel sources
      selftests/bpf: Add test for resolve_btfids

 Documentation/bpf/btf.rst                               |  36 +++++
 Makefile                                                |  25 +++-
 include/asm-generic/vmlinux.lds.h                       |   4 +
 include/linux/btf_ids.h                                 |  87 ++++++++++++
 kernel/bpf/btf.c                                        | 103 ++------------
 kernel/trace/bpf_trace.c                                |   9 +-
 net/core/filter.c                                       |   9 +-
 scripts/link-vmlinux.sh                                 |   6 +
 tools/Makefile                                          |   3 +
 tools/bpf/Makefile                                      |   9 +-
 tools/bpf/resolve_btfids/Build                          |  10 ++
 tools/bpf/resolve_btfids/Makefile                       |  77 +++++++++++
 tools/bpf/resolve_btfids/main.c                         | 721 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/include/linux/btf_ids.h                           |  87 ++++++++++++
 tools/include/linux/compiler.h                          |   4 +
 tools/testing/selftests/bpf/Makefile                    |  14 +-
 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 107 ++++++++++++++
 tools/testing/selftests/bpf/progs/btf_data.c            |  26 ++++
 18 files changed, 1234 insertions(+), 103 deletions(-)
 create mode 100644 include/linux/btf_ids.h
 create mode 100644 tools/bpf/resolve_btfids/Build
 create mode 100644 tools/bpf/resolve_btfids/Makefile
 create mode 100644 tools/bpf/resolve_btfids/main.c
 create mode 100644 tools/include/linux/btf_ids.h
 create mode 100644 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf_data.c