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Tue, 03 Mar 2026 05:52:35 -0800 (PST) Received: from localhost.localdomain ([113.218.252.129]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c70fa62147esm14689782a12.12.2026.03.03.05.52.25 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 03 Mar 2026 05:52:35 -0800 (PST) From: Chengkaitao To: martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, chengkaitao@kylinos.cn, linux-kselftest@vger.kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/6] bpf: Extend the bpf_list family of APIs Date: Tue, 3 Mar 2026 21:52:13 +0800 Message-ID: <20260303135219.33726-1-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kaitao Cheng In BPF, a list can only be used to implement a stack structure. Due to an incomplete API set, only FIFO or LIFO operations are supported. The patches enhance the BPF list API, making it more list-like. Five new kfuncs have been added: bpf_list_del: remove a node from the list bpf_list_add_impl: insert a node after a given list node bpf_list_is_first: check if a node is the first in the list bpf_list_is_last: check if a node is the last in the list bpf_list_empty: check if the list is empty Changes in v4: - [patch v3 1/6] Revert to version v1 - Change the parameters of bpf_list_add_impl to (head, new, prev, ...) Changes in v3: - Add a new lock_rec member to struct bpf_reference_state for lock holding detection. - Add test cases to verify that the verifier correctly restricts calls to bpf_list_del when the spin_lock is not held. Changes in v2: - Remove the head parameter from bpf_list_del - Add bpf_list_add/is_first/is_last/empty to API and test cases Link to v3: https://lore.kernel.org/all/20260302124028.82420-1-pilgrimtao@gmail.com/ Link to v2: https://lore.kernel.org/all/20260225092651.94689-1-pilgrimtao@gmail.com/ Link to v1: https://lore.kernel.org/all/20260209025250.55750-1-pilgrimtao@gmail.com/ Kaitao Cheng (6): bpf: Introduce the bpf_list_del kfunc. selftests/bpf: Add test cases for bpf_list_del bpf: add bpf_list_add_impl to insert node after a given list node selftests/bpf: Add test case for bpf_list_add_impl bpf: add bpf_list_is_first/last/empty kfuncs selftests/bpf: Add test cases for bpf_list_is_first/is_last/empty kernel/bpf/helpers.c | 87 +++++++++ kernel/bpf/verifier.c | 29 ++- .../testing/selftests/bpf/bpf_experimental.h | 42 ++++ .../selftests/bpf/progs/refcounted_kptr.c | 182 ++++++++++++++++++ 4 files changed, 336 insertions(+), 4 deletions(-) -- 2.50.1 (Apple Git-155)