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From: Tianyi Chen <hi@tychen.cc>
To: bpf@vger.kernel.org
Cc: Tianyi Chen <hi@tychen.cc>,
	ast@kernel.org,
	daniel@iogearbox.net,
	andrii@kernel.org,
	eddyz87@gmail.com,
	memxor@gmail.com,
	shuah@kernel.org,
	linux-kselftest@vger.kernel.org,
	qmo@kernel.org,
	ihor.solodrai@linux.dev
Subject: [PATCH bpf-next v12 0/3] bpftool: Add recursive map dumping
Date: Wed, 11 Nov 2026 16:19:24 +0900
Message-ID: <cover.1794380385.git.hi@tychen.cc>
Precedence: list
MIME-Version: 1.0
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Dump each inner map in the entry that references it. This series is
based on the batch dump v10 series [1]; apply that series first.

Changes in v12:
- Separate plain inner-map dumps with blank lines and indent raw
  entries and counts, including wrapped and per-CPU values.
- Read outer entries individually during recursion; keep batch lookups
  for inner maps.
- Use LIBBPF_OPTS in test_unchanged() and check formatting and lookup
  counts. Size the per-CPU layout buffer from the possible CPU count.

All 33 subtests in the combined batch/dump/access run, including the
11 recursive subtests, pass in x86-64 KVM with both 2 and 128 possible
CPUs (2 CPUs online). The old combined bpftool fails the formatting and
outer-lookup checks. Non-recursive output is unchanged.

[1] https://lore.kernel.org/r/cover.1794380384.git.hi@tychen.cc

v11: https://lore.kernel.org/r/cover.1793818386.git.hi@tychen.cc

Tianyi Chen (3):
  bpftool: Reset map info before each query in show and dump loops
  bpftool: Add recursive map dumping
  selftests/bpf: Cover recursive bpftool map dumps

 .../bpf/bpftool/Documentation/bpftool-map.rst |  10 +-
 tools/bpf/bpftool/bash-completion/bpftool     |   3 +
 tools/bpf/bpftool/map.c                       | 131 ++++-
 .../prog_tests/bpftool_map_dump_recursive.c   | 480 ++++++++++++++++++
 .../bpf/progs/bpftool_map_dump_recursive.c    |  38 ++
 5 files changed, 639 insertions(+), 23 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/bpftool_map_dump_recursive.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpftool_map_dump_recursive.c


base-commit: 0fb18ce8a2e9de830433923cf65838933d615359
prerequisite-patch-id: f2cb564c4555c7d7f3c87a7e9827a6e91816affd
prerequisite-patch-id: b8e7968eb997646d032c3489c5462230ee5837e6
-- 
2.56.0