netdev - [PATCH bpf-next 0/5] Add CO-RE support for field existence relos

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Date:   Mon, 14 Oct 2019 16:49:23 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf-next 0/5] Add CO-RE support for field existence relos

This patch set generalizes libbpf's CO-RE relocation support. It not supports field existence relocations, in addition to existing field's byte offset relocation.

This patch set upgrades the format of .BTF.ext's relocation record to match
latest Clang's format (12 -> 16 bytes). This is not a breaking change, as the
previous format hasn't been released yet as part of official Clang version
release.

Andrii Nakryiko (5):
  libbpf: update BTF reloc support to latest Clang format
  libbpf: refactor bpf_object__open APIs to use common opts
  libbpf: add support for field existance CO-RE relocation
  libbpf: add BPF-side definitions of supported field relocation kinds
  selftests/bpf: add field existence CO-RE relocs tests

 tools/lib/bpf/bpf_core_read.h                 |  12 ++
 tools/lib/bpf/btf.c                           |  16 +-
 tools/lib/bpf/btf.h                           |   4 +-
 tools/lib/bpf/libbpf.c                        | 169 +++++++++++-------
 tools/lib/bpf/libbpf.h                        |   4 +-
 tools/lib/bpf/libbpf_internal.h               |  25 ++-
 .../selftests/bpf/prog_tests/core_reloc.c     |  76 +++++++-
 .../bpf/progs/btf__core_reloc_existence.c     |   3 +
 ...ore_reloc_existence___err_wrong_arr_kind.c |   3 +
 ...loc_existence___err_wrong_arr_value_type.c |   3 +
 ...ore_reloc_existence___err_wrong_int_kind.c |   3 +
 ..._core_reloc_existence___err_wrong_int_sz.c |   3 +
 ...ore_reloc_existence___err_wrong_int_type.c |   3 +
 ..._reloc_existence___err_wrong_struct_type.c |   3 +
 .../btf__core_reloc_existence___minimal.c     |   3 +
 .../selftests/bpf/progs/core_reloc_types.h    |  56 ++++++
 .../bpf/progs/test_core_reloc_existence.c     |  79 ++++++++
 17 files changed, 381 insertions(+), 84 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_arr_kind.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_arr_value_type.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_kind.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_sz.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_type.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_struct_type.c
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_existence___minimal.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_core_reloc_existence.c

-- 
2.17.1