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[v7,bpf-next,0/9] bpf: Add d_path helper - preparation changes

Message ID 20200711215329.41165-1-jolsa@kernel.org
Headers show
Series bpf: Add d_path helper - preparation changes | expand

Message

Jiri Olsa July 11, 2020, 9:53 p.m. UTC 
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

v7 changes:
  - added more acks [Andrii]
  - added some name-conflicting entries and fixed resolve_btfids
    to process them properly [Andrii]
  - changed bpf_get_task_stack_proto to use BTF_IDS_LIST/BTF_ID
    macros [Andrii]
  - fixed selftest build for resolve_btfids test

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/bpf/stackmap.c                                   |   5 +-
 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                    |  15 +-
 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 111 +++++++++++++++
 tools/testing/selftests/bpf/progs/btf_data.c            |  50 +++++++
 19 files changed, 1267 insertions(+), 104 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

Comments

Alexei Starovoitov July 13, 2020, 10:07 p.m. UTC | #1 
On Sat, Jul 11, 2020 at 2:53 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> 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
>
> v7 changes:
>   - added more acks [Andrii]
>   - added some name-conflicting entries and fixed resolve_btfids
>     to process them properly [Andrii]
>   - changed bpf_get_task_stack_proto to use BTF_IDS_LIST/BTF_ID
>     macros [Andrii]
>   - fixed selftest build for resolve_btfids test

Applied. Thanks!