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virtio_ring: packed: introduce virtqueue_resize_packed() 

virtio ring packed supports resize.

Only after the new vring is successfully allocated based on the new num,
we will release the old vring. In any case, an error is returned,
indicating that the vring still points to the old vring.

In the case of an error, re-initialize(by virtqueue_reinit_packed()) the
virtqueue to ensure that the vring can be used.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-24-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:38:43 +08:00 committed by Michael S. Tsirkin
parent 56775e141b
commit 947f9fcf67
1 changed files with 30 additions and 0 deletions
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30
drivers/virtio/virtio_ring.c
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@ -2036,6 +2036,36 @@ err_ring:
return NULL;
}
static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
{
struct vring_virtqueue_packed vring_packed = {};
struct vring_virtqueue *vq = to_vvq(_vq);
struct virtio_device *vdev = _vq->vdev;
int err;
if (vring_alloc_queue_packed(&vring_packed, vdev, num))
goto err_ring;
err = vring_alloc_state_extra_packed(&vring_packed);
if (err)
goto err_state_extra;
vring_free(&vq->vq);
virtqueue_vring_init_packed(&vring_packed, !!vq->vq.callback);
virtqueue_init(vq, vring_packed.vring.num);
virtqueue_vring_attach_packed(vq, &vring_packed);
return 0;
err_state_extra:
vring_free_packed(&vring_packed, vdev);
err_ring:
virtqueue_reinit_packed(vq);
return -ENOMEM;
}
/*
* Generic functions and exported symbols.