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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 v10 0/2] bpftool: Use batch lookups for map dumps
Date: Wed, 11 Nov 2026 16:18:54 +0900
Message-ID: <cover.1794380384.git.hi@tychen.cc>
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MIME-Version: 1.0
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Use bounded batch lookups for map dumps, falling back to individual
lookups after the last printed key on a batch error.

RHASH concurrent-delete correctness requires "bpf: Fix RHASH batch
cursor loss" v2 [1]. Please take that kernel fix first.

Changes in v10:
- Document the non-zero key/value size precondition.
- Rename the tests to bpftool_map_dump_batch, drop duplicate LRU cases
  and use small per-CPU maps. Reserve JSON checks for representative
  raw, BTF, per-CPU and multi-batch paths.
- Carry Quentin's Acked-by tags.

The 14 batch subtests pass in x86-64 KVM. Combined with recursive v12,
all 33 dump/access subtests pass with both 2 and 128 possible CPUs
(2 CPUs online), without skips.

[1] https://lore.kernel.org/r/cover.1794379108.git.hi@tychen.cc

v9: https://lore.kernel.org/r/cover.1793821981.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                       |  98 ++++++--
 .../bpf/prog_tests/bpftool_map_dump_batch.c   | 229 ++++++++++++++++++
 .../bpf/progs/bpftool_map_dump_batch.c        |  42 ++++
 3 files changed, 354 insertions(+), 15 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/bpftool_map_dump_batch.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpftool_map_dump_batch.c


base-commit: 0fb18ce8a2e9de830433923cf65838933d615359
-- 
2.56.0