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[v2,bpf-next,0/3] bpf: Allow inner map with different max_entries

Message ID 20200522022336.899416-1-kafai@fb.com
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Series bpf: Allow inner map with different max_entries | expand

Message

Martin KaFai Lau May 22, 2020, 2:23 a.m. UTC 
People has a use case that starts with a smaller inner map first and then
replaces it with a larger inner map later when it is needed.

This series allows the outer map to be updated with inner map in different
size as long as it is safe (meaning the max_entries is not used in the
verification time during prog load).

Please see individual patch for details.

v2:
- New BPF_MAP_TYPE_FL to minimize code churns (Alexei)
- s/capabilities/properties/ (Andrii)
- Describe WHY in commit log (Andrii)

Martin KaFai Lau (3):
  bpf: Consolidate inner-map-compatible properties into bpf_types.h
  bpf: Relax the max_entries check for inner map
  bpf: selftests: Add test for different inner map size

 include/linux/bpf.h                           | 20 ++++++++++--
 include/linux/bpf_types.h                     | 25 +++++++++++----
 kernel/bpf/btf.c                              |  4 +--
 kernel/bpf/map_in_map.c                       | 12 +++----
 kernel/bpf/syscall.c                          | 25 +++++++++++----
 kernel/bpf/verifier.c                         |  4 +--
 .../selftests/bpf/prog_tests/btf_map_in_map.c | 12 +++++++
 .../selftests/bpf/progs/test_btf_map_in_map.c | 31 +++++++++++++++++++
 8 files changed, 107 insertions(+), 26 deletions(-)