From patchwork Fri May 10 23:21:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13662048 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8DC83C25B10 for ; Fri, 10 May 2024 23:21:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F376110E118; Fri, 10 May 2024 23:21:36 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="LeSEb8tt"; dkim-atps=neutral Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) by gabe.freedesktop.org (Postfix) with ESMTPS id D484510E118 for ; Fri, 10 May 2024 23:21:35 +0000 (UTC) Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6202fd268c1so43213387b3.2 for ; Fri, 10 May 2024 16:21:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715383295; x=1715988095; darn=lists.freedesktop.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=MdPPwqmw2OB2eps2P/fXT/DBVgNwUukZ4bhTdtZp228=; b=LeSEb8tt645X6EbiBBk9TN60hNSSweLSq4hpxJ1NJX33jQBEpOff0QcwCNtEEOkvW4 kIfw3pc8FFV4lNkHGsMqFY6r/wJ8L5xdy1rMwUoEXOEMbhkjSki4fiqP9zG885b01zA7 248syStNOU3iPk5EPWElRnXv3GHdG1ErP/A6V6ZpE3P5vDYYFvK6/ByceOdmbyXDfW+q 3vD2D+Wad2Co7H8+XNpS7kA/18deDD4INizzU0C9aNgW90z8L/ll/s7DSQUil4Rf3W2m aCtE7lC1NyTgX7KP9DLQia5vqoaSLHf9FA4elLvi6ckqlOFBZLJXw9qd5WKpKf0yXkhb nY6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715383295; x=1715988095; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=MdPPwqmw2OB2eps2P/fXT/DBVgNwUukZ4bhTdtZp228=; b=qTqxvaP1nvs4FVA2xg1cfFX1WxI3Ir4PjV7uDhnvE7f7dCbEEiUl7G7yEttrd1vH/m 0WKZs9000/xCEyLaot8I3Z7049q/PmNX8l/VV7fGvvoUhMDDX/V+NePzCztpK6CRdAZw CHKQrace+ONRgiXNMpavvny5nFy0BBtLEAw93M5vPD5Sl8CoduvvtIiZ0GQR/jt4L8pY ZK8ioWKO8jAe7yf9+FSdDGzTsz75qDRtjQb+vkWS3+0C8wg99rz/zm1nIDQKUylpg9XG 7yFt02CIvZt6hIXpuwy2TFhteGQne8/OOvRJ0gcJj96PiAY6QIp2gmB4Ab/3w5/Ij3FY +dgw== X-Forwarded-Encrypted: i=1; AJvYcCXl5g1zGULanqaDvf9Sxm2tDuuikoUwcGCRvZDzaFTVkvYuGn1c4ROyAMIzEjavHZA/yzZ0sUH8sfFN0S2UnO3W/DHdGrJhl66d4J1nLgD+ X-Gm-Message-State: AOJu0Ywl2PbRrlUW7jC0PCzeKIvB77zQT5WLrFtkc9IZ5mAZNhdb6lM9 H0HaqpdgC286pSrriTzuhPlfBKfit/nwBqXuCsBWdLbt9h0FVwCsRaPwBzHKy1houW2lBQGkIGK M5TuM0euc1vSr8pueu+sQjA== X-Google-Smtp-Source: AGHT+IHMXabhPnmA8ZNpFjS6LuGhr4/4Qtsxh1KKctSTjcGfvpS/yXd7v1SAm2EHkPFeDF0lY3JAnqUdXw/wbkGhCQ== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:3428:1b4e:e75a:d31b]) (user=almasrymina job=sendgmr) by 2002:a05:690c:c9d:b0:618:8e4b:f49d with SMTP id 00721157ae682-622aff868c9mr10915787b3.4.1715383294779; Fri, 10 May 2024 16:21:34 -0700 (PDT) Date: Fri, 10 May 2024 16:21:12 -0700 In-Reply-To: <20240510232128.1105145-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240510232128.1105145-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.0.118.g7fe29c98d7-goog Message-ID: <20240510232128.1105145-2-almasrymina@google.com> Subject: [PATCH net-next v9 01/14] netdev: add netdev_rx_queue_restart() From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add netdev_rx_queue_restart() function to netdev_rx_queue.h Signed-off-by: David Wei Signed-off-by: Mina Almasry --- v9: https://lore.kernel.org/all/20240502045410.3524155-4-dw@davidwei.uk/ (submitted by David). - fixed SPDX license identifier (Simon). - Rebased on top of merged queue API definition, and changed implementation to match that. - Replace rtnl_lock() with rtnl_is_locked() to make it useable from my netlink code where rtnl is already locked. --- include/net/netdev_rx_queue.h | 3 ++ net/core/Makefile | 1 + net/core/netdev_rx_queue.c | 74 +++++++++++++++++++++++++++++++++++ 3 files changed, 78 insertions(+) create mode 100644 net/core/netdev_rx_queue.c diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h index aa1716fb0e53c..e78ca52d67fbf 100644 --- a/include/net/netdev_rx_queue.h +++ b/include/net/netdev_rx_queue.h @@ -54,4 +54,7 @@ get_netdev_rx_queue_index(struct netdev_rx_queue *queue) return index; } #endif + +int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq); + #endif diff --git a/net/core/Makefile b/net/core/Makefile index 62be9aef25285..f82232b358a2c 100644 --- a/net/core/Makefile +++ b/net/core/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_NETDEV_ADDR_LIST_TEST) += dev_addr_lists_test.o obj-y += net-sysfs.o obj-y += hotdata.o +obj-y += netdev_rx_queue.o obj-$(CONFIG_PAGE_POOL) += page_pool.o page_pool_user.o obj-$(CONFIG_PROC_FS) += net-procfs.o obj-$(CONFIG_NET_PKTGEN) += pktgen.o diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c new file mode 100644 index 0000000000000..b3899358e5a9c --- /dev/null +++ b/net/core/netdev_rx_queue.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include + +int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx) +{ + void *new_mem, *old_mem; + int err; + + if (!dev->queue_mgmt_ops->ndo_queue_stop || + !dev->queue_mgmt_ops->ndo_queue_mem_free || + !dev->queue_mgmt_ops->ndo_queue_mem_alloc || + !dev->queue_mgmt_ops->ndo_queue_start) + return -EOPNOTSUPP; + + DEBUG_NET_WARN_ON_ONCE(!rtnl_is_locked()); + + new_mem = kvzalloc(dev->queue_mgmt_ops->ndo_queue_mem_size, GFP_KERNEL); + if (!new_mem) + return -ENOMEM; + + old_mem = kvzalloc(dev->queue_mgmt_ops->ndo_queue_mem_size, GFP_KERNEL); + if (!old_mem) { + err = -ENOMEM; + goto err_free_new_mem; + } + + err = dev->queue_mgmt_ops->ndo_queue_mem_alloc(dev, new_mem, rxq_idx); + if (err) + goto err_free_old_mem; + + err = dev->queue_mgmt_ops->ndo_queue_stop(dev, old_mem, rxq_idx); + if (err) + goto err_free_new_queue_mem; + + err = dev->queue_mgmt_ops->ndo_queue_start(dev, new_mem, rxq_idx); + if (err) + goto err_start_queue; + + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, old_mem); + + kvfree(old_mem); + kvfree(new_mem); + + return 0; + +err_start_queue: + /* Restarting the queue with old_mem should be successful as we haven't + * changed any of the queue configuration, and there is not much we can + * do to recover from a failure here. + * + * WARN if the we fail to recover the old rx queue, and at least free + * old_mem so we don't also leak that. + */ + if (dev->queue_mgmt_ops->ndo_queue_start(dev, old_mem, rxq_idx)) { + WARN(1, + "Failed to restart old queue in error path. RX queue %d may be unhealthy.", + rxq_idx); + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, &old_mem); + } + +err_free_new_queue_mem: + dev->queue_mgmt_ops->ndo_queue_mem_free(dev, new_mem); + +err_free_old_mem: + kvfree(old_mem); + +err_free_new_mem: + kvfree(new_mem); + + return err; +}