From patchwork Mon Aug 5 21:25:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13754171 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 06FAD16D338 for ; Mon, 5 Aug 2024 21:25:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722893144; cv=none; b=Akd4D3Kf+vU8YD7CjtO+KVH72/u+TnCnGqaDYgZ+1q/94756HeWBAT+MlBLTmxLALkkduf0wlSADwucShLxPGCyF3X093VO+6x+42TWlf6/tcIpAS8UiPDEJY5wybbf+1AgPB8//n2XiQKQqT8dcfduDt/sfwyIbM0CGtt0r41s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722893144; c=relaxed/simple; bh=c+190kI+AY/IAhgbGQObofaAZdRh142Rm4xb7MN95EI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YbLjy3w0XntBFC/UnO3ySxZOPESrroDRbO5n2Dk7TAdLdK30v9J5fQ7ZDwI9Uj+WzoXs0NIy8U1KxnHhwqyE+7nC5uNOUtvdBX1SJOxzotopochDy/oe3gn1fxReWSfrzVU4OQV6biPnaeay6esVinFsRjrrtOds+FdWWgbEO+M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=u2O7QJU6; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="u2O7QJU6" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-666010fb35cso3635337b3.0 for ; Mon, 05 Aug 2024 14:25:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722893140; x=1723497940; darn=vger.kernel.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=y5Bpc0m/aEJfLhT4Qcu12bpXjCKKzXVcLZXLn3h9UO4=; b=u2O7QJU6oBIBPt8lSf/PI1F6uTMBCRqyijHsMlgxaE3a/T/3B4TR+IsllPFbLq4g16 y4svU3615q77wB/dWg3Trnn/CHKq7KELeZs/g8nhmDGl7vMMvm7mRckT8QAGHk9DAQXr lz9iLbevVM8WSekYuVDEMVgKl0cudDMr418ZDQkuNsus9Wb5ewQ8MHEWng05BGwJ08es IW3UC93c7hDw2wd0li8Srg1P+DwW2MQ1gvEG1/6MjNrz7MY4egytXHXYTbbQjrvIk+08 cPvMaAhPbnTyK+HLQETzTOiZEN7GAuSsb2aH5t8gAqUrxZ4noRr68HeYnJx1oUueqclX Na9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722893140; x=1723497940; 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=y5Bpc0m/aEJfLhT4Qcu12bpXjCKKzXVcLZXLn3h9UO4=; b=QdGeUuIl/ivA0xV8oSk1bdebxkl+aBltHJXmuoGUryJDHxOGXRzf6hVoNvWn0lkvct U5hOm2ESsKU9DpSKYqohCHQmYgDej9U/jpqiB6vMDfyQUjc0ghBgCxNvkbQsb2yuAIEC VdOI7CBJEOaNnvbEaWEV6vDLyqN1bcoG0NwPMMTKIriVZvAtgqWYu/HQebDWpWUJmvcj JFlgL2KIVWLnIuUpmSuOKuIyiiQVQcd4GO0JDHx6QrHBdu9MuhpmIcnWL2ZBhDpdZEtg 0GfTbStcCyIojMB17idN6ScYWpqh6dbLux3Z+YyI3atERsYbBT6jqrhyWFdEnaL6cDEu PQQA== X-Forwarded-Encrypted: i=1; AJvYcCWdj0QeJh7kpHizV3SKLhj2GS41T+mkZV2+KIXeWO/GgfM+6KoiV4XNZ12H8FlS+53Lp9Ng9eFNMzcglqCJfnhoESnFWYjlUEZJKIs= X-Gm-Message-State: AOJu0YxMYGDTDlYPT/V479AjCQxEj1iwJ1UFnHtDwZ1G6DUdBA+IN0hD yEJ/MHc+oZ0mQ+Tk728hiDcPTgICErF8SPjqzBL8TIxAaPwPZa15JqTrq09tYbwv0oPUwSqd0PO Si+DL7Ofjzkj6DL8bFHwKww== X-Google-Smtp-Source: AGHT+IHsY6pfqrk+/WzJ2nnI4vwRHJqR73nDo9c7pJpf2zTeT7YCxIEs/vi9EhzX5oPWtfGQgq6YowoMDa9OJyTIuA== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:690c:5:b0:620:32ea:e1d4 with SMTP id 00721157ae682-68959369ac5mr7413287b3.0.1722893140051; Mon, 05 Aug 2024 14:25:40 -0700 (PDT) Date: Mon, 5 Aug 2024 21:25:14 +0000 In-Reply-To: <20240805212536.2172174-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240805212536.2172174-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.rc2.264.g509ed76dc8-goog Message-ID: <20240805212536.2172174-2-almasrymina@google.com> Subject: [PATCH net-next v18 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, linux-kselftest@vger.kernel.org, bpf@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 , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Taehee Yoo , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi Add netdev_rx_queue_restart(), which resets an rx queue using the queue API recently merged[1]. The queue API was merged to enable the core net stack to reset individual rx queues to actuate changes in the rx queue's configuration. In later patches in this series, we will use netdev_rx_queue_restart() to reset rx queues after binding or unbinding dmabuf configuration, which will cause reallocation of the page_pool to repopulate its memory using the new configuration. [1] https://lore.kernel.org/netdev/20240430231420.699177-1-shailend@google.com/T/ Signed-off-by: David Wei Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov Reviewed-by: Jakub Kicinski --- v18: - Add more color to commit message (Xuan Zhuo). v17: - Use ASSERT_RTNL() (Jakub). v13: - Add reviewed-by from Pavel (thanks!) - Fixed comment (Pavel) v11: - Fix not checking dev->queue_mgmt_ops (Pavel). - Fix ndo_queue_mem_free call that passed the wrong pointer (David). 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..da11720a59830 --- /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 || !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; + + ASSERT_RTNL(); + + 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 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; +}