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[v3,bpf-next,0/3] Add BTF-defined map-in-map support to libbpf

Message ID 20200429002739.48006-1-andriin@fb.com
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Series Add BTF-defined map-in-map support to libbpf | expand

Message

Andrii Nakryiko April 29, 2020, 12:27 a.m. UTC 
This patch set teaches libbpf how to declare and initialize ARRAY_OF_MAPS and
HASH_OF_MAPS maps. See patch #3 for all the details.

Patch #1 refactors parsing BTF definition of map to re-use it cleanly for
inner map definition parsing.

Patch #2 refactors map creation and destruction logic for reuse. It also fixes
existing bug with not closing successfully created maps when bpf_object map
creation overall fails.

Patch #3 adds support for an extension of BTF-defined map syntax, as well as
parsing, recording, and use of relocations to allow declaratively initialize
outer maps with references to inner maps.

v1->v2:
  - rename __inner to __array (Alexei).

Andrii Nakryiko (3):
  libbpf: refactor BTF-defined map definition parsing logic
  libbpf: refactor map creation logic and fix cleanup leak
  libbpf: add BTF-defined map-in-map support

 tools/lib/bpf/bpf_helpers.h                   |   1 +
 tools/lib/bpf/libbpf.c                        | 698 ++++++++++++------
 .../selftests/bpf/prog_tests/btf_map_in_map.c |  49 ++
 .../selftests/bpf/progs/test_btf_map_in_map.c |  76 ++
 4 files changed, 606 insertions(+), 218 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_btf_map_in_map.c