From patchwork Wed Jul 20 03:04:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12923416 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 81814CCA486 for ; Wed, 20 Jul 2022 03:06:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241664AbiGTDGp (ORCPT ); Tue, 19 Jul 2022 23:06:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241623AbiGTDFq (ORCPT ); Tue, 19 Jul 2022 23:05:46 -0400 Received: from out30-44.freemail.mail.aliyun.com (out30-44.freemail.mail.aliyun.com [115.124.30.44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F7AF167DF; Tue, 19 Jul 2022 20:05:16 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R471e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VJuvIYA_1658286305; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VJuvIYA_1658286305) by smtp.aliyun-inc.com; Wed, 20 Jul 2022 11:05:06 +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 v12 12/40] virtio_ring: split: introduce virtqueue_reinit_split() Date: Wed, 20 Jul 2022 11:04:08 +0800 Message-Id: <20220720030436.79520-13-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220720030436.79520-1-xuanzhuo@linux.alibaba.com> References: <20220720030436.79520-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 366032b2ffac Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Introduce a function to initialize vq without allocating new ring, desc_state, desc_extra. Subsequent patches will call this function after reset vq to reinitialize vq. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/virtio/virtio_ring.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0c952281264f..2d5e8aec6685 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -958,6 +958,25 @@ static void virtqueue_vring_init_split(struct vring_virtqueue *vq) } } +static void virtqueue_reinit_split(struct vring_virtqueue *vq) +{ + int size, i; + + memset(vq->split.vring.desc, 0, vq->split.queue_size_in_bytes); + + size = sizeof(struct vring_desc_state_split) * vq->split.vring.num; + memset(vq->split.desc_state, 0, size); + + size = sizeof(struct vring_desc_extra) * vq->split.vring.num; + memset(vq->split.desc_extra, 0, size); + + for (i = 0; i < vq->split.vring.num - 1; i++) + vq->split.desc_extra[i].next = i + 1; + + virtqueue_init(vq, vq->split.vring.num); + virtqueue_vring_init_split(vq); +} + static void virtqueue_vring_attach_split(struct vring_virtqueue *vq, struct vring_virtqueue_split *vring_split) {