From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f180.google.com (mail-oi1-f180.google.com [209.85.167.180]) (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 CB0CD44C9E for ; Mon, 6 May 2024 03:35:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714966514; cv=none; b=IzTnTEh1KKCLz2P5ayx0Qsadf88fnxTAuU/qUkw9rQROEvEvAGecBm7qgFd/mYR4Eu0qbZB05doqnDnxdXHDxJC4Pj06l8QxnDllMa815rLAVCcdLYJ8yHcxkiycKbHaxgBY62qW9PwqPnivOhk68gebA7GQPKbTF1zZG3eI/S8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714966514; c=relaxed/simple; bh=kNIxcp68aExunNdyH/HpK8kmbbiCNlm/MVDQoVKx2ig=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=WZUuTC4V16A6HkWfQHmZxakufpahDtFUskdubh0/s6w3FHdj3hAGtK7/HtR9w41xwCzM0tyg8Lgu3dZmyH5qeMngv3Dpgla7QtzYagmBJSdLEfEJAxhcRw/Xi+riRJWq83xjBmznl3yUBmmEGSJl8hwADbsuLnRuMpyBUlkrN34= 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=KuaaNkXH; arc=none smtp.client-ip=209.85.167.180 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="KuaaNkXH" Received: by mail-oi1-f180.google.com with SMTP id 5614622812f47-3c709e5e4f9so986053b6e.3 for ; Sun, 05 May 2024 20:35:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1714966512; x=1715571312; 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=hoXJ0XdCFwL7dsqz4DKp1C9eKf+cFLheoBEKfmLaHCY=; b=KuaaNkXH55A5H0ySDSaigl5UKoVVcrq8ib3ZkXmVnnAy2DG+wtRD6iExNrw3nYStVx weyghbqN4QTbm1N29Pe9o/w3qdIletnMS38e6w93IMSIK8jx3vLAJQoborglVYlw01nL 9vadW5gZKh3NT7OO2yIfWWqLYais95z2MGlog4IgxvGh5yScMaU4pJPXCaHDJDrA/uzY BzDF3bT7L/EU5LHgRcpAGi1upTUsh84xHfyRtrM5AqaPguDwVKKYvPKe7VCY+9LbffWb eZiOM7ivAoCsaOKCzTcbUr3pBor/ZkZNsUfYCPb7FHE9VGdTK0NUqpj9/+bfgl8H4RsZ G8fw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714966512; x=1715571312; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=hoXJ0XdCFwL7dsqz4DKp1C9eKf+cFLheoBEKfmLaHCY=; b=iiQ5VEdbPedKMrjMFwOU/TwvXjV41vGv89KrxedCp9oVeGjdnUGQG15QOStU8gEc37 0ihnzUFJREvcM/mg3FF2pOBsghid/nrCoaYN6OGB2R9weUolt2jdfhGjesrTia6ow6bC lnH/0C/RF6kTrMwhkhfr571p9iWhIM3aV4ANVGoYYYpswBMpACzFiLDfyHXOTsXqp9ch q8UjsxguN4kBdjbG+FxDtU7R/gVeIu4Ju7VUJI+i7qeFAv6pOTcjfUQMX78AuPvtqHRM M9hBZya/YfJeFDOu3I74YJrVuQw3mCLZQ+xU7VNr0SXMmnYq9tFkYCYQShKgR7r0GoES TIQQ== X-Gm-Message-State: AOJu0YxK/foTQAKHTs0UKMQPKsJgfNv2mHfxwCu4nThZK2QZCxYSh0j8 I79nGokNzmTHrrVivNw92Il7tmb2TmnyGD0KyyXjZNkWsj389Mds X-Google-Smtp-Source: AGHT+IGDGPWszOf7ZB8gq6s20eclSHl2uhtrDkDL4Mh2/48fsgIG7nAPuXdH2M56NCVl8Oh6k4jzcQ== X-Received: by 2002:a05:6870:f729:b0:233:4685:aea3 with SMTP id ej41-20020a056870f72900b002334685aea3mr11609026oab.41.1714966511851; Sun, 05 May 2024 20:35:11 -0700 (PDT) Received: from localhost.localdomain ([39.144.105.178]) by smtp.gmail.com with ESMTPSA id g9-20020aa79dc9000000b006f33c0aee44sm6897539pfq.91.2024.05.05.20.35.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 05 May 2024 20:35:11 -0700 (PDT) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org Cc: bpf@vger.kernel.org, Yafang Shao Subject: [PATCH v7 bpf-next 0/2] bpf: Add a generic bits iterator Date: Mon, 6 May 2024 11:33:51 +0800 Message-Id: <20240506033353.28505-1-laoar.shao@gmail.com> X-Mailer: git-send-email 2.30.1 (Apple Git-130) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit hree new kfuncs, namely bpf_iter_bits_{new,next,destroy}, have been added for the new bpf_iter_bits functionality. These kfuncs enable the iteration of the bits from a given address and a given number of bits. - bpf_iter_bits_new Initialize a new bits iterator for a given memory area. Due to the limitation of bpf memalloc, the max number of bits to be iterated over is (4096 * 8). - bpf_iter_bits_next Get the next bit in a bpf_iter_bits - bpf_iter_bits_destroy Destroy a bpf_iter_bits The bits iterator can be used in any context and on any address. Changes: - v6->v7: - Fix endianness error for non-long-aligned data (Andrii) - v5->v6: - Add positive tests (Andrii) - v4->v5: - Simplify test cases (Andrii) - v3->v4: - Fix endianness error on s390x (Andrii) - zero-initialize kit->bits_copy and zero out nr_bits (Andrii) - v2->v3: - Optimization for u64/u32 mask (Andrii) - v1->v2: - Simplify the CPU number verification code to avoid the failure on s390x (Eduard) - bpf: Add bpf_iter_cpumask https://lwn.net/Articles/961104/ - bpf: Add new bpf helper bpf_for_each_cpu https://lwn.net/Articles/939939/ Yafang Shao (2): bpf: Add bits iterator selftests/bpf: Add selftest for bits iter kernel/bpf/helpers.c | 140 +++++++++++++++ .../selftests/bpf/prog_tests/verifier.c | 2 + .../selftests/bpf/progs/verifier_bits_iter.c | 160 ++++++++++++++++++ 3 files changed, 302 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/verifier_bits_iter.c -- 2.30.1 (Apple Git-130)