From patchwork Wed Jun 29 06:56:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12899397 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 EE73ECCA48E for ; Wed, 29 Jun 2022 06:57:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232619AbiF2G5m (ORCPT ); Wed, 29 Jun 2022 02:57:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232574AbiF2G51 (ORCPT ); Wed, 29 Jun 2022 02:57:27 -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 973B7313A3; Tue, 28 Jun 2022 23:57:25 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R231e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHmYOqS_1656485838; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHmYOqS_1656485838) by smtp.aliyun-inc.com; Wed, 29 Jun 2022 14:57:19 +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 10/40] virtio_ring: split: extract the logic of attach vring Date: Wed, 29 Jun 2022 14:56:26 +0800 Message-Id: <20220629065656.54420-11-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 Separate the logic of attach vring, subsequent patches will call it separately. Since the "struct vring_virtqueue_split split" is created on the stack and has been initialized to 0. So using split->queue_dma_addr/split->queue_size_in_bytes assignment for queue_dma_addr/queue_size_in_bytes can keep the same as the original code. On the other hand, subsequent patches can use the "struct vring_virtqueue_split split" obtained by vring_alloc_queue_split() to directly complete the attach operation. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/virtio/virtio_ring.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index cedd340d6db7..9025bd373d3b 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -940,6 +940,18 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq) return NULL; } +static void virtqueue_vring_attach_split(struct vring_virtqueue *vq, + struct vring_virtqueue_split *vring) +{ + vq->split.queue_dma_addr = vring->queue_dma_addr; + vq->split.queue_size_in_bytes = vring->queue_size_in_bytes; + + vq->split.vring = vring->vring; + + vq->split.desc_state = vring->desc_state; + vq->split.desc_extra = vring->desc_extra; +} + static int vring_alloc_state_extra_split(struct vring_virtqueue_split *vring) { struct vring_desc_state_split *state; @@ -2287,10 +2299,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && !context; - vq->split.queue_dma_addr = 0; - vq->split.queue_size_in_bytes = 0; - - vq->split.vring = _vring; vq->split.avail_flags_shadow = 0; vq->split.avail_idx_shadow = 0; @@ -2310,10 +2318,8 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, return NULL; } - vq->split.desc_state = vring.desc_state; - vq->split.desc_extra = vring.desc_extra; - virtqueue_init(vq, vring.vring.num); + virtqueue_vring_attach_split(vq, &vring); spin_lock(&vdev->vqs_list_lock); list_add_tail(&vq->vq.list, &vdev->vqs);