From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (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 2134A22576E for ; Sun, 30 Nov 2025 23:35:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764545733; cv=none; b=Uh7OtDd2EJ62xfqzns/vHe34tx/ZAvjJa8WcbvYk4sDmLLbrYDGm5UylBgmtlEiczoxZUluiY1nL4fUlF01BY26nBNdPNWTe9kTPtMvQ0YC0YDgJ6pckXdahjv1l0eh7Si9yhWp5PI1lhPrBOYfdwyXnBPeyg+xLy9Wkg+RPAdY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764545733; c=relaxed/simple; bh=avO1UeedN/STJoSnCOQ5Xr9OSRYW37NwH27coYDpseQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Pwii+ufbryclHx5NNEc6Hj5QovOXwatQi0yjJyj7UBzMTgleehoROzLKhcIyfnaVMJn9n0ABBOlcdCMIFwNiqRvzREGwvqfOtYnBTZOoyGhakPxl3sP5QzUdaHGRjYoqeLIj+Q4x4a3cPchfUPukp390KJIoDV4UE42U0bzXFYQ= 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=h4f8V7nv; arc=none smtp.client-ip=209.85.128.44 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="h4f8V7nv" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-47796a837c7so23594845e9.0 for ; Sun, 30 Nov 2025 15:35:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1764545730; x=1765150530; 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=ALyiArP9r0l0ZpA0zLf3NyzsTN9+4HjumhR11AEukHk=; b=h4f8V7nvPWWoMVa68CRM2LO+qo+XByujMWOZ5O7binnC5OBl2uVh5CRq/ZxhwA4pOJ sVBFdhnPUKGj/49+CrUa+p7MbZ2MVV2jHG6tZr7QZei1fe6iHaq8nqGdoIYItbAQ0Ht/ Gvy7nSwxZJWiC4kBX6IBd0swsU33v6O7We9GUk2bV60PJ/jCgeCKPb7VaCPYoJRYNmsC SfeKrHsavZTmfhwxjfpJLXLM3eNE2JOQ2Yenhgyy7+52FQl7aRyNqatsSmqmDVuOZ6l+ IcAP0hxvk+nhGJDPI5NYBv19nBce+1ytyN/4KYgeNq+qmV0ttr8VpQ3YDIuGQDSi1aBz wJRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764545730; x=1765150530; 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=ALyiArP9r0l0ZpA0zLf3NyzsTN9+4HjumhR11AEukHk=; b=Vs2ggrQq5IQkXmg2bmB7i+1iAHvq+ftSwH9/ImYRUIPT89bI+lmp3yAiuI+Yg7VGjQ OQv0RUqREh5Ss3HqPuwgGnBKDu6tE1VFUwX3GUcHf6UybdOL32O9jDM0/DZ0cxloHYN0 AecGcSyEeHn+icWTrDJk4E/cuZrGISNWO4xpCpnyOwzKsXuuRRM7gcqv0z8SUaqPumGp 4CVx7v+IuIMMBqo/qF4AeJ2GpeaK0v00xTujsYH5hW+w+nXc7lgs6gA/ViKivLFldA04 XYIW5+sK1cEITtEFQ88S+qDccZLpAgWNQKM8tV3gtlG6x408++/pB5Qa/xaMmOG5f99h Vk6A== X-Forwarded-Encrypted: i=1; AJvYcCW4zO4xNDZoRT59WI7YgDDpuDSsdPyKA9bm4VHKmDNBFOPZ0EtrNnBh1abvBwksf8jP5sWw6t7ZNA==@vger.kernel.org X-Gm-Message-State: AOJu0YxtG/qaR97/71Ej2xM3q+EZgBwqidCtghQ7zyTgZcbiJWjVQMRi 90qzUXDeopRHMfGY5F+TnvdPUChdjlzIuoW+3nbmrGGUm3NIErJ4tEbT X-Gm-Gg: ASbGncup8S6Z5vAO+UYYRnQ05cmlYZBfj6mS1zXuw7cqaFVAx0ay3qZ+pNapVJK77Am Jz21W9EfEobp2t4S/4zqDEEn9vu0QwfgdODRegw+DVJYFF3v+bVkPVGbitig/y1BM+UGOZEc4er 1gDOvov+4U0sHSG33RmuX0DS3jGZeTsATgF8/pOz52X71BO4iBqKyPbkvriEFYd5CSRBS8JTrYs wjz89HdfuoWuxiqRTIpQuxzmbuCFZdcIIHJh++/QanKi++C9uc1nY66UeG8sbxXBn3IPZwJEPyY Gfjyv007MxFWzOyBhybZaMlARrDPqem0EX8tbyheQgu/lwMcxanDcpSeDcOy9MJXeiWyW4UnE2A r8DPqLIj45XKJNkFGrcNMpYnmSXeO14whXp/8Rbk+41zMUZNNK1NA1Ueza9G/645D7sXn5qKW9y 4QaIxwSJI+vp2LqaNM+OztFLDewhKMeyfkRsU+s4K2xIbeW6mszs3oBqL8vMc6DRu0VuItepHo4 Ono70IxnzMIl7i0 X-Google-Smtp-Source: AGHT+IEsn3y7t81hF2sQhBQPO/kczdL3fkFMA/jNBZwT0LAhZBVzEYImw+yrGW7ekTwLlt8XRlDFBQ== X-Received: by 2002:a05:600c:1d0e:b0:477:89d5:fdb2 with SMTP id 5b1f17b1804b1-477c017d9damr362894825e9.14.1764545730116; Sun, 30 Nov 2025 15:35:30 -0800 (PST) Received: from 127.mynet ([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-479040b3092sm142722075e9.1.2025.11.30.15.35.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 Nov 2025 15:35:28 -0800 (PST) From: Pavel Begunkov To: netdev@vger.kernel.org Cc: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Michael Chan , Pavan Chebbi , Andrew Lunn , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Ilias Apalodimas , Shuah Khan , Mina Almasry , Stanislav Fomichev , Pavel Begunkov , Yue Haibing , David Wei , Haiyue Wang , Jens Axboe , Joe Damato , Simon Horman , Vishwanath Seshagiri , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, io-uring@vger.kernel.org, dtatulea@nvidia.com Subject: [PATCH net-next v7 0/9] Add support for providers with large rx buffer Date: Sun, 30 Nov 2025 23:35:15 +0000 Message-ID: X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Note: it's net/ only bits and doesn't include changes, which shoulf be merged separately and are posted separately. The full branch for convenience is at [1], and the patch is here: https://lore.kernel.org/io-uring/7486ab32e99be1f614b3ef8d0e9bc77015b173f7.1764265323.git.asml.silence@gmail.com Many modern NICs support configurable receive buffer lengths, and zcrx and memory providers can use buffers larger than 4K/PAGE_SIZE on x86 to improve performance. When paired with hw-gro larger rx buffer sizes can drastically reduce the number of buffers traversing the stack and save a lot of processing time. It also allows to give to users larger contiguous chunks of data. The idea was first floated around by Saeed during netdev conf 2024 and was asked about by a few folks. Single stream benchmarks showed up to ~30% CPU util improvement. E.g. comparison for 4K vs 32K buffers using a 200Gbit NIC: packets=23987040 (MB=2745098), rps=199559 (MB/s=22837) CPU %usr %nice %sys %iowait %irq %soft %idle 0 1.53 0.00 27.78 2.72 1.31 66.45 0.22 packets=24078368 (MB=2755550), rps=200319 (MB/s=22924) CPU %usr %nice %sys %iowait %irq %soft %idle 0 0.69 0.00 8.26 31.65 1.83 57.00 0.57 This series adds net infrastructure for memory providers configuring the size and implements it for bnxt. It's an opt-in feature for drivers, they should advertise support for the parameter in the qops and must check if the hardware supports the given size. It's limited to memory providers as it drastically simplifies implementation. It doesn't affect the fast path zcrx uAPI, and the sizes is defined in zcrx terms, which allows it to be flexible and adjusted in the future, see Patch 8 for details. A liburing example can be found at [2] full branch: [1] https://github.com/isilence/linux.git zcrx/large-buffers-v7 Liburing example: [2] https://github.com/isilence/liburing.git zcrx/rx-buf-len v7: - Add xa_destroy - Rebase v6: - Update docs and add a selftest v5: https://lore.kernel.org/netdev/cover.1760440268.git.asml.silence@gmail.com/ - Remove all unnecessary bits like configuration via netlink, and multi-stage queue configuration. v4: https://lore.kernel.org/all/cover.1760364551.git.asml.silence@gmail.com/ - Update fbnic qops - Propagate max buf len for hns3 - Use configured buf size in __bnxt_alloc_rx_netmem - Minor stylistic changes v3: https://lore.kernel.org/all/cover.1755499375.git.asml.silence@gmail.com/ - Rebased, excluded zcrx specific patches - Set agg_size_fac to 1 on warning v2: https://lore.kernel.org/all/cover.1754657711.git.asml.silence@gmail.com/ - Add MAX_PAGE_ORDER check on pp init - Applied comments rewording - Adjust pp.max_len based on order - Patch up mlx5 queue callbacks after rebase - Minor ->queue_mgmt_ops refactoring - Rebased to account for both fill level and agg_size_fac - Pass providers buf length in struct pp_memory_provider_params and apply it in __netdev_queue_confi(). - Use ->supported_ring_params to validate drivers support of set qcfg parameters. Jakub Kicinski (1): eth: bnxt: adjust the fill level of agg queues with larger buffers Pavel Begunkov (8): net: page pool: xa init with destroy on pp init net: page_pool: sanitise allocation order net: memzero mp params when closing a queue net: let pp memory provider to specify rx buf len eth: bnxt: store rx buffer size per queue eth: bnxt: allow providers to set rx buf size io_uring/zcrx: document area chunking parameter selftests: iou-zcrx: test large chunk sizes Documentation/networking/iou-zcrx.rst | 20 +++ drivers/net/ethernet/broadcom/bnxt/bnxt.c | 118 ++++++++++++++---- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 + drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 6 +- drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 2 +- include/net/netdev_queues.h | 9 ++ include/net/page_pool/types.h | 1 + net/core/netdev_rx_queue.c | 14 ++- net/core/page_pool.c | 4 + .../selftests/drivers/net/hw/iou-zcrx.c | 72 +++++++++-- .../selftests/drivers/net/hw/iou-zcrx.py | 37 ++++++ 11 files changed, 236 insertions(+), 49 deletions(-) -- 2.52.0