From patchwork Wed Jun 29 06:56:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12899390 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE510C43334 for ; Wed, 29 Jun 2022 06:57:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230042AbiF2G5U (ORCPT ); Wed, 29 Jun 2022 02:57:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232476AbiF2G5S (ORCPT ); Wed, 29 Jun 2022 02:57:18 -0400 Received: from out199-4.us.a.mail.aliyun.com (out199-4.us.a.mail.aliyun.com [47.90.199.4]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3069F31220; Tue, 28 Jun 2022 23:57:11 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R311e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046060;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHmY18d_1656485820; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHmY18d_1656485820) by smtp.aliyun-inc.com; Wed, 29 Jun 2022 14:57:02 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Xuan Zhuo , Vincent Whitchurch , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org, kangjie.xu@linux.alibaba.com Subject: [PATCH v11 02/40] virtio: struct virtio_config_ops add callbacks for queue_reset Date: Wed, 29 Jun 2022 14:56:18 +0800 Message-Id: <20220629065656.54420-3-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220629065656.54420-1-xuanzhuo@linux.alibaba.com> References: <20220629065656.54420-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 3fdaf102dd89 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org reset can be divided into the following four steps (example): 1. transport: notify the device to reset the queue 2. vring: recycle the buffer submitted 3. vring: reset/resize the vring (may re-alloc) 4. transport: mmap vring to device, and enable the queue In order to support queue reset, add two callbacks(reset_vq, enable_reset_vq) in struct virtio_config_ops to implement steps 1 and 4. Signed-off-by: Xuan Zhuo --- include/linux/virtio_config.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index b47c2e7ed0ee..ded51b0d4823 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -78,6 +78,16 @@ struct virtio_shm_region { * @set_vq_affinity: set the affinity for a virtqueue (optional). * @get_vq_affinity: get the affinity for a virtqueue (optional). * @get_shm_region: get a shared memory region based on the index. + * @reset_vq: reset a queue individually (optional). + * vq: the virtqueue + * Returns 0 on success or error status + * reset_vq will guarantee that the callbacks are disabled and synchronized. + * Except for the callback, the caller should guarantee that the vring is + * not accessed by any functions of virtqueue. + * @enable_reset_vq: enable a reset queue + * vq: the virtqueue + * Returns 0 on success or error status + * If reset_vq is set, then enable_reset_vq must also be set. */ typedef void vq_callback_t(struct virtqueue *); struct virtio_config_ops { @@ -104,6 +114,8 @@ struct virtio_config_ops { int index); bool (*get_shm_region)(struct virtio_device *vdev, struct virtio_shm_region *region, u8 id); + int (*reset_vq)(struct virtqueue *vq); + int (*enable_reset_vq)(struct virtqueue *vq); }; /* If driver didn't advertise the feature, it will never appear. */