From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f45.google.com (mail-pj1-f45.google.com [209.85.216.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8ED17375F96 for ; Sun, 29 Mar 2026 14:05:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774793120; cv=none; b=F8ydABhe/j4rjeFQPWgXpP/4oDT2g6gv2/Z+PZJzhwcRk4oOZDW1jSc6pRZMJBSsnpzx5PxTCyI/fhqiS03Y3aFWPrBWLsPS78iiwZgsRKXgY40ECFDurXkdabdm9dvyvrQQAoPlrX7OoZpo6Jw58lpXgFv8cuHUW/m1BBpydsQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774793120; c=relaxed/simple; bh=+ne+0mmU+TH4johwejMARgSVXL4tRCNd1WonWRkY57I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=FuauJ7o09ROmAcKeQFO4xLyz/xFNnn95PI6H/Pf+icvjqnszpncEgTMt4UgwFrr2EsALOjeaWsUJkNStOXO0KooffmUQrE3bIFH6t0fbS3vForuX56fKPX+htAIxvGIsZWuB1JZLtJY87UK0dAIv/B0XmbGlYdDwEW4sg2nY17E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GD9XWZqj; arc=none smtp.client-ip=209.85.216.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GD9XWZqj" Received: by mail-pj1-f45.google.com with SMTP id 98e67ed59e1d1-35c238f1063so1709683a91.1 for ; Sun, 29 Mar 2026 07:05:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774793118; x=1775397918; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=/P2cEhfTAZlAAcFjnHzMCawVs7idJ1YVuxYar8E7U3Y=; b=GD9XWZqjbndriGL0qBI4hIC2Ey54fLsMVNXfUlkiT6DcIXzLR170m2rC3isLveFQyM vmVDGjRM0YSURXdZCpcTo0K1ELjwA+Zud+UEdxBHjJ6zsEr/Epl4ViNqBzGbdT6HztMj Eri/bniTE4NDykFqGVEEsjdeTmhfmhJ54nXltnsEU2s0M3Z/Nt9x5XME5+GwvlWeAIEF ao6LYPUgD4oVf68upI1fRrQoRDxSWl3rYvycs8/EY72YefjrukcxpjUyWpAMCEAI79ss z5fgNaj1egrvoH8fe00R7ShN57imepUNKpPl2TgCMy3KnNLItpLj+5ruhxH4PkcH4ru2 gaWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774793118; x=1775397918; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=/P2cEhfTAZlAAcFjnHzMCawVs7idJ1YVuxYar8E7U3Y=; b=DRgjvUC7dWYsfHdh0P9Hz5/cRzq2UHy6Wm6CCT4smTTtz7/+hw+fRqXQADYPTdyepo nYVqDIov8VnOGfRHpocHMXqP+ExgnsYaH3xU29yHMkpxPa0ROPAC9fU1/WVLiz5jWBjU /EOhfbHL+ruRgUAoh+MFtiW8oXmWe6F6pAuMUS3JYdu7ZQWWPvcWN2LbgYeDQL4unsfR 2gRH+sNqNVpSEl+QmNXihbunVIGVlPVxoIrM1LvHdOEvm/PwJWCAQrndM8fH17pMrb8e el0vav9FaVquXrWeEggJHitpdnhfpPbmQM2vLSwwWioFhdg5EiFV3Svy/+nDkXyukBYO U+Nw== X-Forwarded-Encrypted: i=1; AJvYcCV9n2GHTafIW8Z03hdEJ5hEWANl543lqDZZaMdtPZh36PgDvF6nMeaFlRbYkiVVLbgcSFgJZu5YBg8Xxx0=@vger.kernel.org X-Gm-Message-State: AOJu0YzpCqInQd7xRPV7BgcmUsPMxthfrjwUC8I+NzDtilWNDOxngr9v P74alZDmORK07zXvBE0Ze0v7SXCo25gDY2tBfzcdlRlAijVRrykEVWJr X-Gm-Gg: ATEYQzys17BASkDQ37naHmgQYGVhSp5ibstFGjWjReDXU8hJMm13L1MyQrd5BnEw96s eQj6qfhVXhNnZEWR2C0B56sRPjnv/8dGtn8+MqnwkOKty1lxqHisMKR2kODJggE+2qqSiUZeftT PCTvvL3/BvLRY117bhxNTyrqAuvB9cSoR1E7hHxFRehsg5fQLb5s48mQ5deAMLExjhhEc5HUHKQ x7g4pPt+S5aw5llRpZ2KU+8c1KXtXlM2KsjAhPxrneVQQABDKSXjZXcmoy+dwY8Jhb+xYaqk35D lh5Ee50UKV3K/wfJKwNYV3NvBdiDoobnpnH0NCrAY84lYUgz/Ymk9dHwCYpm8Tbn2mr/gDh5Sjc TPIpjn40Er77PPM9UiP3OH7GQoBL1qWZtEdOGUgatt3HuW99M03PaLc88vTjKSjGyBPJ6P4K8YO wUbvFOvDOQAsSJrqwvTUN58kzNyBEb7f2yT9aYOyf24AO31CIyhO/BrqsRDzrjIODM X-Received: by 2002:a17:90b:4c0c:b0:35b:e554:53a6 with SMTP id 98e67ed59e1d1-35c2ff8c23emr9330644a91.11.1774793117775; Sun, 29 Mar 2026 07:05:17 -0700 (PDT) Received: from localhost.localdomain ([113.218.252.111]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35d950bd630sm4417454a91.16.2026.03.29.07.05.12 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 29 Mar 2026 07:05:17 -0700 (PDT) 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 bpf-next v9 0/9] bpf: Extend the bpf_list family of APIs Date: Sun, 29 Mar 2026 22:04:57 +0800 Message-ID: <20260329140506.9595-1-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 refactor kfunc checks to table-driven approach, and add test cases for the aforementioned kfuncs. Changes in v9: - Expand table-driven approach coverage - Clear list node owner and unlink before drop - Remove warnings caused by WARN_ON_ONCE() - Introduce the __nonown_allowed suffix Changes in v8: - Use [patch v7 5/5] as the start of the patch series - Introduce double pointer prev_ptr in __bpf_list_del - Extract refactored __bpf_list_del/add into separate patches - Allow bpf_list_front/back result as the prev argument of bpf_list_add - Split test cases Changes in v7: - Replace bpf_list_node_is_edge with bpf_list_is_first/is_last - Reimplement __bpf_list_del and __bpf_list_add - Simplify test cases Changes in v6: - Merge [patch v5 (2,4,6)/6] into [patch v6 4/5] - If list_head was 0-initialized, init it - refactor kfunc checks to table-driven approach Changes in v5: - Fix bpf_obj leak on bpf_list_add_impl error 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 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 (9): bpf: refactor kfunc checks using table-driven approach in verifier 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_impl to insert node after a given list node bpf: allow bpf_list_front/back result as the prev argument of bpf_list_add_impl bpf: add bpf_list_is_first/last/empty kfuncs selftests/bpf: Add test cases for bpf_list_del/add/is_first/is_last/empty Documentation/bpf/kfuncs.rst | 20 +- kernel/bpf/helpers.c | 126 ++++++- kernel/bpf/verifier.c | 301 ++++++++++------- .../testing/selftests/bpf/bpf_experimental.h | 16 + .../selftests/bpf/progs/refcounted_kptr.c | 311 ++++++++++++++++++ 5 files changed, 636 insertions(+), 138 deletions(-) -- 2.50.1 (Apple Git-155)