From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-182.mta1.migadu.com (out-182.mta1.migadu.com [95.215.58.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C86FF25A2A2 for ; Mon, 27 Apr 2026 16:59:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777309163; cv=none; b=Mq35C6z0bxffHunQlG93fLxA1teOjuFctIjSg96m/dpvnjMa3gsAEhb4wXntEojgoHYuE6iz6WCC01mWU6W4io/Sn4tegofRwGgiruokRHblrtNjaFJKL8J9Bu3SCEQI3aNL0ouIGfU9BQTK+7lZdsonoA7hN2e4TVB9v6ztvAg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777309163; c=relaxed/simple; bh=Eh74TSifcGeEOIzcpSzOVIR1X9KHsOJLEHChXgvhSDE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=kj2lN7CJTAVBHPeANY7LzMrJ+pB95mqPUfOwYsjcbLmGAJ+0TP7oQGNmBTVMjhuDXHWWlokskyPVzUqNThfw7KjAzGNizx5m33Hjo+yeNkuSCDcNQZdMOa8wjbEeebCHgnI/kkLQlX1XB/45YwHIiOVGuLRObELtsTvfe7qlc7Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=OzHyqwzg; arc=none smtp.client-ip=95.215.58.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="OzHyqwzg" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1777309158; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=KuQ4lB0Yb/eJHtuSptfULFcyza6MPAInuIUye+FUgmc=; b=OzHyqwzgNU3USZCD8JWyycUprZ4XXGPunbAZmN9q2DDrlE/rnk2oO3/z+8WAtD+PgM2xii DIzTG6vIKFB6XEAD5N7twZlE+j2hqFVfWtlWpS44HSRIbnQhQJwFHDiDfoxejMkt+sbPNC 09m/HnPYV8uG9Z1pvLirzUIMVQQWIe4= From: Kaitao cheng 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, Kaitao cheng Subject: [PATCH bpf-next v10 0/8] bpf: Extend the bpf_list family of APIs Date: Tue, 28 Apr 2026 00:58:58 +0800 Message-ID: <20260427165906.84420-1-kaitao.cheng@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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 And add test cases for the aforementioned kfuncs. Changes in v10: - Remove the table-driven approach (Ihor Solodrai) - Use the __nonown_allowed suffix for bpf_list_del/front/back - Add test cases for __nonown_allowed Changes in v9: - Expand table-driven approach coverage (Emil Tsalapatis) - Clear list node owner and unlink before drop (Emil Tsalapatis) - Remove warnings caused by WARN_ON_ONCE() (Emil Tsalapatis) - Introduce the __nonown_allowed suffix (Alexei Starovoitov) Changes in v8: - Use [patch v7 5/5] as the start of the patch series (Leon Hwang) - Introduce double pointer prev_ptr in __bpf_list_del (Kumar Kartikeya Dwivedi) - Extract refactored __bpf_list_del/add into separate patches (Leon Hwang) - Allow bpf_list_front/back result as the prev argument of bpf_list_add - Split test cases (Leon Hwang) Changes in v7: - Replace bpf_list_node_is_edge with bpf_list_is_first/is_last - Reimplement __bpf_list_del and __bpf_list_add (Kumar Kartikeya Dwivedi) - Simplify test cases (Mykyta Yatsenko) Changes in v6: - Merge [patch v5 (2,4,6)/6] into [patch v6 4/5] (Leon Hwang) - If list_head was 0-initialized, init it - refactor kfunc checks to table-driven approach (Leon Hwang) Changes in v5: - Fix bpf_obj leak on bpf_list_add_impl error Changes in v4: - [patch v3 1/6] Revert to version v1 (Alexei Starovoitov) - 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 (Alexei Starovoitov) - Add bpf_list_add/is_first/is_last/empty to API and test cases (Alexei Starovoitov) Link to v9: https://lore.kernel.org/all/20260329140506.9595-1-pilgrimtao@gmail.com/ Link to v8: https://lore.kernel.org/all/20260316112843.78657-1-pilgrimtao@gmail.com/ Link to v7: https://lore.kernel.org/all/20260308134614.29711-1-pilgrimtao@gmail.com/ Link to v6: https://lore.kernel.org/all/20260304143459.78059-1-pilgrimtao@gmail.com/ Link to v5: https://lore.kernel.org/all/20260304031606.43884-1-pilgrimtao@gmail.com/ Link to v4: https://lore.kernel.org/all/20260303135219.33726-1-pilgrimtao@gmail.com/ 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 (8): bpf: refactor __bpf_list_del to take list node pointer bpf: clear list node owner and unlink before drop bpf: Introduce the bpf_list_del kfunc. bpf: refactor __bpf_list_add to take insertion point via **prev_ptr bpf: Add bpf_list_add to insert node after a given list node bpf: add bpf_list_is_first/last/empty kfuncs bpf: allow non-owning list-node args via __nonown_allowed selftests/bpf: Add test cases for bpf_list_del/add/is_first/is_last/empty Documentation/bpf/kfuncs.rst | 22 +- kernel/bpf/helpers.c | 139 ++++-- kernel/bpf/verifier.c | 44 +- .../selftests/bpf/progs/refcounted_kptr.c | 421 ++++++++++++++++++ 4 files changed, 593 insertions(+), 33 deletions(-) -- 2.50.1 (Apple Git-155)