From patchwork Sat Apr 6 09:15:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrea Righi X-Patchwork-Id: 786600 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) (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 E29DF4AEF5 for ; Sat, 6 Apr 2024 09:20:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.125.188.123 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712395229; cv=none; b=XT1PX0jhqWBm6O30bQL37GCH4tRGfu7O3z+uK4JQ30IFVy7WaM/XEAEsv0vRhvFX7cPrDlI9F089N6eptP6z6i4bc/cTnQENBIVDJF5oZtjvLwQDdcrMDY9REPbwWQoRfnsvgrRsPvyMMLHQtCUjF+9l9FSZeoxdhpCiAD46NcE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712395229; c=relaxed/simple; bh=wls7Uj9lvj1C2cR+9fWVS8Sq79ZqlDYd8ckzjVd9vKU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Ky+w2issJ5z2O5OeeXIosHCtTo6mYsFa8ZdmSCpIFvF50HVkg9MS1GA1nhDsvD/ICMXQnmKNDYrXrqfghiDd/h57bPPa975EqvZ8116kJ4bz2257cNLKyjkBigGcQko1kL41brcGlu6OqVHp+yoIpqm1zUr6WJLka5OTRSVqwCM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com; spf=pass smtp.mailfrom=canonical.com; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b=q5tKbRrb; arc=none smtp.client-ip=185.125.188.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=canonical.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b="q5tKbRrb" Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id 50C833FE1A for ; Sat, 6 Apr 2024 09:20:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1712395215; bh=yx7vpzXIHTYh5j3nTDQp+mlNbiWJAYHc0w9red4g/BM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=q5tKbRrbGHpGojfGgHsaMjDoDLetvIHPRt0im7kJhwqocece92yWsvf/UgIim9k1b pXvo5/PIRhPr6ryr81hz87Qodp6JfBc6dNH4hHm+isVQH9bkr4TJzk0MavxKHxhiri 3wZlRg0Q8nL1KyBg6daNMw/No7vPoJgXUdqDAfur1LnJEgSF05FgDyHbAD5qp+2pEv 5FH82iXExetDEjeigwlIYuv7TWShMuBWYgxqInS/h0U1Fydyd1M++WugWPNhWZGhGx c0THrXthn5I/AfFLiQdSmgN4iyzUWBPcNOtPMYyLsDnE/+Doma6oc2mFwa+cXkR6fC NLUCJjKUu8nrw== Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-4162bc2da3fso9929575e9.1 for ; Sat, 06 Apr 2024 02:20:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712395212; x=1713000012; 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=yx7vpzXIHTYh5j3nTDQp+mlNbiWJAYHc0w9red4g/BM=; b=gP/gLY4l0xptjdElcUHuprAWC5WdT2wqra6pLKXq94UbdlskOtVydHHAnUuorh2Vi7 zQuqQdgsKSu8E+Ko6eS+KpeWdDjvX9Gr47sVfyj1UU38483gqwdIyrW1J4+ktmMAlH9r Okv7kX3hASyysunLNgSfyUBYuFOB3pAHJjwhkRlEACfIdUmNODPOVQjH2nIQVDTZSvJb IlH2ws/u7WJAIj/Po1b1MJTMLbYS8hftcCdL20eKzXUTU0Mo9/EhbkJPLajOrqjEZqjz yxXMLRQSfjPARhYCuybWdFKEW5cEwB+R0zO9UJSFttf6Z41Oq+ZF2cGRvjzDu/RKDqs3 ADbA== X-Forwarded-Encrypted: i=1; AJvYcCW2IiQ+4ZH2nYKB2ZbtEt+Acin3eEDsa23afgSbzZq2Tz1JgPGdw8pMCImBSaXOViz0v3HXsMR2u+BtYYyS8GiWZJn9NXdFJtZSd+D5PEEN X-Gm-Message-State: AOJu0YxO5W4SsOPpQYACQx5KzUoZgTQZ/uaP0Zkg3DplXoikYffVwxuN 5PjnkuDnOTS9MQ0k0/TtANQTUWM5NGYBQ6AMi5g4icPvYSnBfhe7RVRj+gTuZX2R041eKwpw4om dSq9Imj8lRAeMuxI9VQQmrd/82dg4gYaxcCgWGIPSSqXx/MT/+A/KIaGRvQd72EcIrUHLOtM8G0 EmJ98lqg== X-Received: by 2002:a05:600c:4e93:b0:415:691c:f83d with SMTP id f19-20020a05600c4e9300b00415691cf83dmr2852409wmq.33.1712395212480; Sat, 06 Apr 2024 02:20:12 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHit5kOPUjw5jx+vy2tg5jUYvea3lG9TQoPRZVf5aXYZyCaWrS8RAEXac+i+7u4IVkSCPt8Yg== X-Received: by 2002:a05:600c:4e93:b0:415:691c:f83d with SMTP id f19-20020a05600c4e9300b00415691cf83dmr2852376wmq.33.1712395211958; Sat, 06 Apr 2024 02:20:11 -0700 (PDT) Received: from gpd.station (net-2-39-142-110.cust.vodafonedsl.it. [2.39.142.110]) by smtp.gmail.com with ESMTPSA id l23-20020a7bc457000000b00414924f307csm5779993wmi.26.2024.04.06.02.20.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 06 Apr 2024 02:20:11 -0700 (PDT) From: Andrea Righi To: Andrii Nakryiko , Eduard Zingerman Cc: Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , David Vernet , Tejun Heo , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/4] libbpf: API to partially consume items from ringbuffer Date: Sat, 6 Apr 2024 11:15:40 +0200 Message-ID: <20240406092005.92399-1-andrea.righi@canonical.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce ring__consume_n() and ring_buffer__consume_n() API to partially consume items from one (or more) ringbuffer(s). This can be useful, for example, to consume just a single item or when we need to copy multiple items to a limited user-space buffer from the ringbuffer callback. Practical example (where this API can be used): https://github.com/sched-ext/scx/blob/b7c06b9ed9f72cad83c31e39e9c4e2cfd8683a55/rust/scx_rustland_core/src/bpf.rs#L217 See also: https://lore.kernel.org/lkml/20240310154726.734289-1-andrea.righi@canonical.com/T/#u v4: - add a selftest to test the new API - open a new 1.5.0 cycle v3: - rename ring__consume_max() -> ring__consume_n() and ring_buffer__consume_max() -> ring_buffer__consume_n() - add new API to a new 1.5.0 cycle - fixed minor nits / comments v2: - introduce a new API instead of changing the callback's retcode behavior Andrea Righi (4): libbpf: Start v1.5 development cycle libbpf: ringbuf: allow to consume up to a certain amount of items libbpf: Add ring__consume_n / ring_buffer__consume_n selftests/bpf: Add tests for ring__consume_n and ring_buffer__consume_n tools/lib/bpf/libbpf.h | 12 +++++ tools/lib/bpf/libbpf.map | 6 +++ tools/lib/bpf/libbpf_version.h | 2 +- tools/lib/bpf/ringbuf.c | 59 ++++++++++++++++++++---- tools/testing/selftests/bpf/prog_tests/ringbuf.c | 8 ++++ 5 files changed, 76 insertions(+), 11 deletions(-)