From patchwork Fri Jun 24 02:55:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12893391 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 B3569CCA489 for ; Fri, 24 Jun 2022 02:57:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231575AbiFXC5X (ORCPT ); Thu, 23 Jun 2022 22:57:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231405AbiFXC5B (ORCPT ); Thu, 23 Jun 2022 22:57:01 -0400 Received: from out30-42.freemail.mail.aliyun.com (out30-42.freemail.mail.aliyun.com [115.124.30.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3C386270C; Thu, 23 Jun 2022 19:56:57 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHEuVxH_1656039410; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHEuVxH_1656039410) by smtp.aliyun-inc.com; Fri, 24 Jun 2022 10:56:52 +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 v10 13/41] virtio_ring: split: extract the logic of vring init Date: Fri, 24 Jun 2022 10:55:53 +0800 Message-Id: <20220624025621.128843-14-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220624025621.128843-1-xuanzhuo@linux.alibaba.com> References: <20220624025621.128843-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: fef800c86cd2 Precedence: bulk List-ID: X-Mailing-List: netdev@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 --- 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 7ee8dd4328ca..23aab28431b9 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -935,6 +935,24 @@ 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) { @@ -2264,17 +2282,6 @@ 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); @@ -2285,6 +2292,7 @@ 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);