linux-kernel - [PATCH v3 0/2] libbpf: fix reuse of DEVMAP

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Message-ID: <20250814180113.1245565-2-yuka@yuka.dev>
Date: Thu, 14 Aug 2025 20:01:11 +0200
From: Yureka Lilian <yuka@...a.dev>
To: Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>
Cc: Yureka Lilian <yuka@...a.dev>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/2] libbpf: fix reuse of DEVMAP

changes in v3:

- instead of setting BPF_F_RDONLY_PROG on both sides, just
  clear BPF_F_RDONLY_PROG in map_info.map_flags as suggested
  by Andrii Nakryiko

- in the test, use ASSERT_* instead of CHECK
- shorten the test by using open_and_load from the skel
- in the test, drop NULL check before unloading/destroying bpf objs

- start the commit messages with "libbpf" and "selftests/bpf"
  respectively instead of just "bpf"

changes in v2:

- preserve compatibility with older kernels
- add a basic selftest covering the re-use of DEVMAP maps

Yureka Lilian (2):
  libbpf: fix reuse of DEVMAP
  selftests/bpf: add test for DEVMAP reuse

 tools/lib/bpf/libbpf.c                        | 11 ++++
 .../bpf/prog_tests/pinning_devmap_reuse.c     | 50 +++++++++++++++++++
 .../selftests/bpf/progs/test_pinning_devmap.c | 20 ++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_pinning_devmap.c

-- 
2.50.1