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Date: Wed, 29 Jun 2022 14:56:26 +0800 From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com> To: virtualization@...ts.linux-foundation.org Cc: Richard Weinberger <richard@....at>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, Johannes Berg <johannes@...solutions.net>, "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Hans de Goede <hdegoede@...hat.com>, Mark Gross <markgross@...nel.org>, Vadim Pasternak <vadimp@...dia.com>, Bjorn Andersson <bjorn.andersson@...aro.org>, Mathieu Poirier <mathieu.poirier@...aro.org>, Cornelia Huck <cohuck@...hat.com>, Halil Pasic <pasic@...ux.ibm.com>, Eric Farman <farman@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev <agordeev@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Vincent Whitchurch <vincent.whitchurch@...s.com>, linux-um@...ts.infradead.org, netdev@...r.kernel.org, platform-driver-x86@...r.kernel.org, linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org, kvm@...r.kernel.org, bpf@...r.kernel.org, kangjie.xu@...ux.alibaba.com Subject: [PATCH v11 10/40] virtio_ring: split: extract the logic of attach vring 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 <xuanzhuo@...ux.alibaba.com> --- 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); -- 2.31.0
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