From patchwork Wed Jun 29 06:56:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12899440 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 A3650CCA481 for ; Wed, 29 Jun 2022 06:58:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232641AbiF2G5q (ORCPT ); Wed, 29 Jun 2022 02:57:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232568AbiF2G51 (ORCPT ); Wed, 29 Jun 2022 02:57:27 -0400 Received: from out30-54.freemail.mail.aliyun.com (out30-54.freemail.mail.aliyun.com [115.124.30.54]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D68D531398; Tue, 28 Jun 2022 23:57:24 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R791e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VHml7x-_1656485836; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VHml7x-_1656485836) by smtp.aliyun-inc.com; Wed, 29 Jun 2022 14:57:17 +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 09/40] virtio_ring: split: extract the logic of alloc state and extra Date: Wed, 29 Jun 2022 14:56:25 +0800 Message-Id: <20220629065656.54420-10-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 creating desc_state, desc_extra, and subsequent patches will call it independently. Since only the structure vring is passed into __vring_new_virtqueue(), when creating the function vring_alloc_state_extra_split(), we prefer to use vring_virtqueue_split as a parameter, and it will be more convenient to pass vring_virtqueue_split to some subsequent functions. So a new vring_virtqueue_split variable is added in __vring_new_virtqueue(). Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 58 +++++++++++++++++++++++++----------- 1 file changed, 40 insertions(+), 18 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index a9ceb9c16c54..cedd340d6db7 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -204,6 +204,7 @@ struct vring_virtqueue { #endif }; +static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num); /* * Helpers. @@ -939,6 +940,32 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq) return NULL; } +static int vring_alloc_state_extra_split(struct vring_virtqueue_split *vring) +{ + struct vring_desc_state_split *state; + struct vring_desc_extra *extra; + u32 num = vring->vring.num; + + state = kmalloc_array(num, sizeof(struct vring_desc_state_split), GFP_KERNEL); + if (!state) + goto err_state; + + extra = vring_alloc_desc_extra(num); + if (!extra) + goto err_extra; + + memset(state, 0, num * sizeof(struct vring_desc_state_split)); + + vring->desc_state = state; + vring->desc_extra = extra; + return 0; + +err_extra: + kfree(state); +err_state: + return -ENOMEM; +} + static void vring_free_split(struct vring_virtqueue_split *vring, struct virtio_device *vdev) { @@ -2224,7 +2251,7 @@ EXPORT_SYMBOL_GPL(vring_interrupt); /* Only available for split ring */ struct virtqueue *__vring_new_virtqueue(unsigned int index, - struct vring vring, + struct vring _vring, struct virtio_device *vdev, bool weak_barriers, bool context, @@ -2232,7 +2259,9 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, void (*callback)(struct virtqueue *), const char *name) { + struct vring_virtqueue_split vring = {}; struct vring_virtqueue *vq; + int err; if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) return NULL; @@ -2261,7 +2290,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->split.queue_dma_addr = 0; vq->split.queue_size_in_bytes = 0; - vq->split.vring = vring; + vq->split.vring = _vring; vq->split.avail_flags_shadow = 0; vq->split.avail_idx_shadow = 0; @@ -2273,30 +2302,23 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->split.avail_flags_shadow); } - vq->split.desc_state = kmalloc_array(vring.num, - sizeof(struct vring_desc_state_split), GFP_KERNEL); - if (!vq->split.desc_state) - goto err_state; + vring.vring = _vring; - vq->split.desc_extra = vring_alloc_desc_extra(vring.num); - if (!vq->split.desc_extra) - goto err_extra; + err = vring_alloc_state_extra_split(&vring); + if (err) { + kfree(vq); + return NULL; + } - memset(vq->split.desc_state, 0, vring.num * - sizeof(struct vring_desc_state_split)); + vq->split.desc_state = vring.desc_state; + vq->split.desc_extra = vring.desc_extra; - virtqueue_init(vq, vq->split.vring.num); + virtqueue_init(vq, vring.vring.num); spin_lock(&vdev->vqs_list_lock); list_add_tail(&vq->vq.list, &vdev->vqs); spin_unlock(&vdev->vqs_list_lock); return &vq->vq; - -err_extra: - kfree(vq->split.desc_state); -err_state: - kfree(vq); - return NULL; } EXPORT_SYMBOL_GPL(__vring_new_virtqueue);