From patchwork Wed Jun 29 06:56:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12899437 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 EC1EDCCA488 for ; Wed, 29 Jun 2022 06:57:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232697AbiF2G5s (ORCPT ); Wed, 29 Jun 2022 02:57:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232583AbiF2G53 (ORCPT ); Wed, 29 Jun 2022 02:57:29 -0400 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C15931397; Tue, 28 Jun 2022 23:57:27 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046050;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHmjenP_1656485840; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHmjenP_1656485840) by smtp.aliyun-inc.com; Wed, 29 Jun 2022 14:57:21 +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 11/40] virtio_ring: split: extract the logic of vring init Date: Wed, 29 Jun 2022 14:56:27 +0800 Message-Id: <20220629065656.54420-12-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: kvm@vger.kernel.org Separate the logic of initializing vring, and subsequent patches will call it separately. This function completes the variable initialization of split vring. It together with the logic of atatch constitutes the initialization of vring. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/virtio/virtio_ring.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 9025bd373d3b..35540daaa1e7 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -940,6 +940,24 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq) return NULL; } +static void virtqueue_vring_init_split(struct vring_virtqueue *vq) +{ + struct virtio_device *vdev; + + vdev = vq->vq.vdev; + + vq->split.avail_flags_shadow = 0; + vq->split.avail_idx_shadow = 0; + + /* No callback? Tell other side not to bother us. */ + if (!vq->vq.callback) { + vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT; + if (!vq->event) + vq->split.vring.avail->flags = cpu_to_virtio16(vdev, + vq->split.avail_flags_shadow); + } +} + static void virtqueue_vring_attach_split(struct vring_virtqueue *vq, struct vring_virtqueue_split *vring) { @@ -2299,17 +2317,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; - vq->split.avail_flags_shadow = 0; - vq->split.avail_idx_shadow = 0; - - /* No callback? Tell other side not to bother us. */ - if (!callback) { - vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT; - if (!vq->event) - vq->split.vring.avail->flags = cpu_to_virtio16(vdev, - vq->split.avail_flags_shadow); - } - vring.vring = _vring; err = vring_alloc_state_extra_split(&vring); @@ -2320,6 +2327,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, virtqueue_init(vq, vring.vring.num); virtqueue_vring_attach_split(vq, &vring); + virtqueue_vring_init_split(vq); spin_lock(&vdev->vqs_list_lock); list_add_tail(&vq->vq.list, &vdev->vqs);