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Fri, 06 Nov 2026 18:07:33 -0800 (PST) Received: from localhost.localdomain ([98.148.34.5]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b25e485ce2sm9338497c88.7.2026.11.06.18.07.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 18:07:33 -0800 (PST) From: Hungyu Lin To: ast@kernel.org, bpf@vger.kernel.org Cc: andrii@kernel.org, qmo@kernel.org, daniel@iogearbox.net, yonghong.song@linux.dev, eddyz87@gmail.com, ihor.solodrai@linux.dev, shuah@kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Hungyu Lin Subject: [PATCH bpf-next v4 0/3] Normalize enum values in libbpf and bpftool Date: Sat, 7 Nov 2026 02:07:22 +0000 Message-ID: <20261107020725.36675-1-dennylin0707@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series fixes enum signedness in libbpf and bpftool data dumps using the shared btf_enum_value() helper suggested by Alexei. It also uses the helper for enum-backed map fields, where sign extension can change the requested map_extra value. Ordinary enums are interpreted according to kflag. When kflag is clear, values are treated as unsigned, including BTF from producers that did not record signedness. The helper returns __u64, consistent with btf_enum64_value(). bpftool casts to __s64 at signed numeric output. CO-RE relocation handling is left for a separate change. Changes in v4: - Return __u64 from btf_enum_value(), as requested by Andrii. - Rely on kflag for name matching; remove legacy comparisons and bpftool's cached match and priority logic, as requested by Andrii. - Remove the legacy and ambiguous narrow-alias test cases. Keep signed controls, unsigned names, numeric output and width-boundary coverage. - Add an open-only skeleton test for the map_extra parser. - Drop four libbpf numeric-fallback cases that do not exercise this change. - Rebase onto bpf-next commit 3e1821848412. Tested on arm64 (Linux 6.12.68, GCC 13.3, Clang 18.1). libbpf and bpftool build with -Werror. Without patches 1 and 2, 9 of the 18 new subtests in btf_dump, bpftool_map_dump and map_extra fail. With the series, all 18 pass; the 23 existing subtests pass in both cases. v3: https://lore.kernel.org/bpf/20261101103221.51534-1-dennylin0707@gmail.com/ Thanks, Hungyu Hungyu Lin (3): libbpf: Normalize enum values according to signedness bpftool: Preserve unsigned enum values in data dumps selftests/bpf: Cover enum signedness in data dumps and map fields tools/bpf/bpftool/btf_dumper.c | 23 ++- tools/lib/bpf/btf.h | 6 + tools/lib/bpf/btf_dump.c | 2 +- tools/lib/bpf/libbpf.c | 2 +- .../bpf/prog_tests/bpftool_map_dump.c | 162 ++++++++++++++++++ .../selftests/bpf/prog_tests/btf_dump.c | 77 +++++++++ .../selftests/bpf/prog_tests/map_extra.c | 19 ++ .../selftests/bpf/progs/test_map_extra.c | 12 ++ 8 files changed, 293 insertions(+), 10 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/map_extra.c create mode 100644 tools/testing/selftests/bpf/progs/test_map_extra.c base-commit: 3e18218484126afb9da722080659c038cb2256ab -- 2.43.0