From patchwork Mon Sep 9 05:43:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13795816 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 49C4F1AD3ED for ; Mon, 9 Sep 2024 05:43:25 +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=1725860609; cv=none; b=gGyH4t4xQkEPPhPB75d8VLvZsKr/cgOeTAXAgXBaa5AZ2dQdHvngJ+3oDKJAZKUZKeDLmu58RYhH5Q3ewAKOPgWsFO61//Q2HL604zFXrnOJixlynISQrwANoQNR9GoTcjyebuYxsG1yY/Uv4R5chemI//IOpwy7J5KDNNLgEBk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725860609; c=relaxed/simple; bh=DNA3F85kfwiW9bgsfvLXXO875oSihrq+DpGt530m/B8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=IoYSQWnGht5CLYLayP4IqInr5xNCT3zHS520klQjNEppA9rvjbztuvErfbSYCElEFFn8vZh8Rmntfxcn0bHIbMoX0MUUbNuE1wzVPiYM5xUeiVabZc0VnMd59NTdXiWjbRRbbetLfIxgJo5NESjiXFYJKu+0UAiN1gTpqpH4NWI= 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=bhjNMIen; 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="bhjNMIen" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6d54ab222fcso134229327b3.1 for ; Sun, 08 Sep 2024 22:43:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1725860604; x=1726465404; 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=i/PEygQn081YuovQ6b+Ov4J7AW7lnL8H+wq29MS093A=; b=bhjNMIenuk14C2l5V7q6HmUTPR/6a5fI1mLuNOuKhTPL4QFbZJ2hAKOng7I4m73L02 dHo+Zen81V06Aijil2ADBN+FROdjz+IeuA3aQGt1ncU0D0V1emng0fAt2+NaiRpEheEo p8kRRkFfRif7SNooNw9eofva7REUSIZrKXRym/sJ5Ko3jToKwvJsM8gFwWXH1uirzcgT mShe2gTJRgNWiabbBO9zBKkzmVgXiZUmgomCqZDYJOsyZ3kbN/vPlb74iaSAddbXRsmV 08KuEaD+WIiPe6JeWkXqBgu2GBMEYmI5pCWsFZD3BO7dQnqu8g72LK+qf0OQCG4GMBgX oxNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725860604; x=1726465404; 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=i/PEygQn081YuovQ6b+Ov4J7AW7lnL8H+wq29MS093A=; b=YGlf0HQUKemFYjH73ANa9aRcJBqA5a9KTRa7J0IVm9PD1tCNGszfsxJT7pkMrcSBXT J2JMTAKik/Fmm4IRI1PRxkDV9sMmuI1Jsvf7KVLTv+IiX+ZVdlYvIdGd6Dhm/Bw5swZm dvjVmkpUPmpPyNf04eVj4hno4Mq8AMPKJF4rAXrRGuQyFBnDhdHqAtInrr6X3LBA0U48 e9P0XRJi2JCn00gF6MpxDF37H8sxpXJoMGLo+LGIvhV+bUc0qR357MMUQ+/NgozzdBOC iYzc2482yQiqjtMnXb9KuD2p1/KHilCox7/yZcyAbsW+aRqqe9eCwTdVf5hGzCh42jpK r0/w== X-Forwarded-Encrypted: i=1; AJvYcCVBouyZ93co1mUH03+vLHMkoskDbinIYCKu1naN5prqPLZLYF6ONtYFhNOwOBXNVZAxnq7Nm79b3eoZO+7CvDg=@vger.kernel.org X-Gm-Message-State: AOJu0YyoYmyxuVHgz4OOagDDS23ObNa1Ye7rhbyZt4N5qEb8GNsH/9EK M23o09LifJpb1v6sJwOzj1NRX8iHJ0UYrO+uv5pCIoSAsxVLU3Pc4UdNmxff8yG9XHwgoLnhu/K T53jI4pZoTWDLUsPIPZ486g== X-Google-Smtp-Source: AGHT+IHY3ZWZM5m6iLmr25lpRxzPgba3UWyYzEPhtrKYdPsv3KEg5Ew5Cd8AVaehz177/KHSxTj8z97y5iwx9jcZ0A== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6902:4d1:b0:e0b:cce3:45c7 with SMTP id 3f1490d57ef6-e1d349e38d5mr18201276.9.1725860604167; Sun, 08 Sep 2024 22:43:24 -0700 (PDT) Date: Mon, 9 Sep 2024 05:43:06 +0000 In-Reply-To: <20240909054318.1809580-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240909054318.1809580-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog Message-ID: <20240909054318.1809580-2-almasrymina@google.com> Subject: [PATCH net-next v25 01/13] 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 , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , " =?utf-8?b?QmrDtnJu?= =?utf-8?b?IFTDtnBlbA==?= " , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Shuah Khan , Alexei Starovoitov , Daniel Borkmann , John Fastabend , 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 , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Taehee Yoo 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 aa1716fb0e53..e78ca52d67fb 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 62be9aef2528..f82232b358a2 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 000000000000..da11720a5983 --- /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; +}