[PATCH bpf-next v9 0/2] bpftool: Use batch lookups for map dumps

[Tianyi Chen <hi@tychen.cc>]

Use batch lookups for map dumps and continue with individual lookups
from the last printed key after any batch error.

Changes in v9 (selftests only):
- Pre-size RHASH maps to keep asynchronous growth out of the
  order-sensitive dump comparisons (Sashiko).
- Correct the explanation of the injected -EBUSY: it exercises fallback,
  but is not the current hash bucket lock failure errno (BPF CI).

Tested in an x86-64 VM: all 16 batch subtests, 100 repetitions of the
RHASH subtest, and the combination with the recursive series pass.

v8: https://lore.kernel.org/r/cover.1793818387.git.hi@tychen.cc

Tianyi Chen (2):
  bpftool: Use batch lookups for map dumps
  selftests/bpf: Check bpftool batch map dumps

 tools/bpf/bpftool/map.c                       |  97 ++++++--
 .../bpf/prog_tests/bpftool_map_batch.c        | 231 ++++++++++++++++++
 .../selftests/bpf/progs/bpftool_map_batch.c   |  42 ++++
 3 files changed, 355 insertions(+), 15 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/bpftool_map_batch.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpftool_map_batch.c


base-commit: 8fb43ffc3327d12d57d3fbe6f4820b5a522de0d1
-- 
2.56.0