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virtio_ring: separate the logic of reset/enable from virtqueue_resize

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The subsequent reset function will reuse these logic.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230810123057.43407-9-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2023-08-10 20:30:53 +08:00 committed by Michael S. Tsirkin
parent 4d09f24080
commit ad48d53b5b
1 changed files with 39 additions and 19 deletions
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58
drivers/virtio/virtio_ring.c
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@ -2152,6 +2152,43 @@ static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
return -ENOMEM;
}
static int virtqueue_disable_and_recycle(struct virtqueue *_vq,
void (*recycle)(struct virtqueue *vq, void *buf))
{
struct vring_virtqueue *vq = to_vvq(_vq);
struct virtio_device *vdev = vq->vq.vdev;
void *buf;
int err;
if (!vq->we_own_ring)
return -EPERM;
if (!vdev->config->disable_vq_and_reset)
return -ENOENT;
if (!vdev->config->enable_vq_after_reset)
return -ENOENT;
err = vdev->config->disable_vq_and_reset(_vq);
if (err)
return err;
while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
recycle(_vq, buf);
return 0;
}
static int virtqueue_enable_after_reset(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
struct virtio_device *vdev = vq->vq.vdev;
if (vdev->config->enable_vq_after_reset(_vq))
return -EBUSY;
return 0;
}
/*
* Generic functions and exported symbols.
@ -2702,13 +2739,8 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
void (*recycle)(struct virtqueue *vq, void *buf))
{
struct vring_virtqueue *vq = to_vvq(_vq);
struct virtio_device *vdev = vq->vq.vdev;
void *buf;
int err;
if (!vq->we_own_ring)
return -EPERM;
if (num > vq->vq.num_max)
return -E2BIG;
@ -2718,28 +2750,16 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
if ((vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num) == num)
return 0;
if (!vdev->config->disable_vq_and_reset)
return -ENOENT;
if (!vdev->config->enable_vq_after_reset)
return -ENOENT;
err = vdev->config->disable_vq_and_reset(_vq);
err = virtqueue_disable_and_recycle(_vq, recycle);
if (err)
return err;
while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
recycle(_vq, buf);
if (vq->packed_ring)
err = virtqueue_resize_packed(_vq, num);
else
err = virtqueue_resize_split(_vq, num);
if (vdev->config->enable_vq_after_reset(_vq))
return -EBUSY;
return err;
return virtqueue_enable_after_reset(_vq);
}
EXPORT_SYMBOL_GPL(virtqueue_resize);