From patchwork Tue Jul 30 02:26:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13746398 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 0E7E7C3DA4A for ; Tue, 30 Jul 2024 02:26:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 63E1010E3D0; Tue, 30 Jul 2024 02:26:34 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="HjSPZuGQ"; dkim-atps=neutral Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3F77810E3D0 for ; Tue, 30 Jul 2024 02:26:32 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6688b5b40faso89615077b3.2 for ; Mon, 29 Jul 2024 19:26:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722306391; x=1722911191; 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=C44lb5hNN9lAphxW//db4Eth/JgtLnnK8QoFtVFSwh0=; b=HjSPZuGQAwRfNcXMttSPCGJMgfiKnbsMapNk4PeMqOhw1sENygPp1WvPP4VI+wrmPO /+bU/iYi+S58oWzTpU/hrartt/NqxFQ1CtMPJsdxeGzQ4ZDwNPozInPaCAqLNiEKczM6 /VBihFezXRXm0ex9KAqyv3GemURF3Wr095s5V2gdkI+vOUQu5W3iL6m9T1glZeSpKeMm zF/jwFPFOA5UcxH/o1jVTFAFOXenFmaDLBEsgo+3nbqHfDWfkNKyObxMQmLuwPU6VN7u qdr5mHJLgM4p0TaAViEK8TOCCf8VqhfbTsQKt9i2OkyWLNzYWLWRdBQntG0FZA5E5tFy iJpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722306391; x=1722911191; 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=C44lb5hNN9lAphxW//db4Eth/JgtLnnK8QoFtVFSwh0=; b=bblbMAsb06DVpFizUFpavzGL3mRkJ5xHZsbHA1jFY97nrF5u+yQya8n2ErGqJRBDGE sVDHb5Ym0MspF7KTLBgqkwAXodsApJVtDsvboa+ImFzlLZEKRpoqQ12R6oXSzJxZaW1m oOnYAdSWUU64981hx36rJCo3mWkuVl3pBx9OqOhhCSH5M40A4tLx1Pt0+SXzaXL59yPn i4V6QamOgdu1p0z83ljtERiu23URAxN3NFif6YvPliCF1ZnvGuSme4Q79Xr63WgWVikT bb2kI2pjq7T8JWEyMssJpchaIlJ89XZDpQaHLJPU3yxD4vxSTxuireteq2qv3wc4ayES 9F5Q== X-Forwarded-Encrypted: i=1; AJvYcCVDbzI1Bjhx/hTFBM594fbK3gMvXbFCKXyPF9hvW1k2xp7QoB1CFQHrNWUHJMQNeMrci/O+yPXNncbIbjdHcIO+GIDJwYJ99Jvuq/ty5jpC X-Gm-Message-State: AOJu0Yz1RQjPy9aF6tzfd9lfgpwM0IOLR4cXsB+vQMd6HxR3xLx2QJc5 DFAX/mW9vhZzbZ0Rv9wwFm1fdcafgAB7XpmXKgEOyd/E3LG0n/LXHMV9IvN8sKle/3K963NokAY lM4nhD2UZ5iPRNu1zuoX+Vw== X-Google-Smtp-Source: AGHT+IF6AykE+MJXlpsN8HcPC+9FdgqHK5OmTuMGlM7LJpDJxeEgu4zgbS8M5mmlpqO1zTCPLusGMkfbsWWNT0JaJQ== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:690c:ec6:b0:64b:5dc3:e4fe with SMTP id 00721157ae682-67a04c27922mr520457b3.1.1722306391151; Mon, 29 Jul 2024 19:26:31 -0700 (PDT) Date: Tue, 30 Jul 2024 02:26:05 +0000 In-Reply-To: <20240730022623.98909-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240730022623.98909-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240730022623.98909-2-almasrymina@google.com> Subject: [PATCH net-next v17 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 , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , 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 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 Reviewed-by: Pavel Begunkov Reviewed-by: Jakub Kicinski --- 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; +}