From patchwork Thu Jan 20 06:42:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12718284 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 DFDE5C433FE for ; Thu, 20 Jan 2022 06:43:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358823AbiATGnZ (ORCPT ); Thu, 20 Jan 2022 01:43:25 -0500 Received: from out30-42.freemail.mail.aliyun.com ([115.124.30.42]:54188 "EHLO out30-42.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358790AbiATGnR (ORCPT ); Thu, 20 Jan 2022 01:43:17 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R291e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0V2LASB-_1642660992; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0V2LASB-_1642660992) by smtp.aliyun-inc.com(127.0.0.1); Thu, 20 Jan 2022 14:43:13 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , bpf@vger.kernel.org Subject: [PATCH v2 08/12] virtio: queue_reset: add helper Date: Thu, 20 Jan 2022 14:42:59 +0800 Message-Id: <20220120064303.106639-9-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220120064303.106639-1-xuanzhuo@linux.alibaba.com> References: <20220120064303.106639-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add helper for virtio queue reset. * virtio_reset_vq: reset a queue individually * virtio_enable_resetq: enable a reset queue In the virtio_reset_vq(), these tasks will be completed: 1. notify the hardware queue to reset 2. recycle the buffer from vq 3. delete the vq Signed-off-by: Xuan Zhuo --- include/linux/virtio_config.h | 43 +++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index e50a377c27a0..f84347f4e4ee 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -239,6 +239,49 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, desc); } +/** + * virtio_reset_vq - reset a queue individually + * @vdev: the device + * @queue_index: the queue index + * @callback: callback to free unused bufs + * @data: pass to callback + * + * returns 0 on success or error status + * + */ +static inline +int virtio_reset_vq(struct virtio_device *vdev, u16 queue_index, + vq_reset_callback_t *callback, void *data) +{ + if (!vdev->config->reset_vq) + return -ENOENT; + + return vdev->config->reset_vq(vdev, queue_index, callback, data); +} + +/** + * virtio_enable_resetq - enable a reset queue + * @vdev: the device + * @queue_index: the queue index + * @callback: callback for the virtqueue, NULL for vq that do not need a callback + * @name: virtqueue names (mainly for debugging), NULL for vq unused by driver + * @ctx: ctx + * + * returns vq on success or error status + * + */ +static inline +struct virtqueue *virtio_enable_resetq(struct virtio_device *vdev, + u16 queue_index, vq_callback_t *callback, + const char *name, const bool *ctx) +{ + if (!vdev->config->enable_reset_vq) + return ERR_PTR(-ENOENT); + + return vdev->config->enable_reset_vq(vdev, queue_index, callback, + name, ctx); +} + /** * virtio_device_ready - enable vq use in probe function * @vdev: the device