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authorXuan Zhuo <xuanzhuo@linux.alibaba.com>2022-08-01 09:38:43 +0300
committerMichael S. Tsirkin <mst@redhat.com>2022-08-11 11:06:40 +0300
commit947f9fcf674f8f3f09e01dfb5d8e564650875878 (patch)
tree828a66e9e08b10a44a9181266568144fdb9b61ba /drivers/virtio
parent56775e141b18790f70e05537f3a1417565e766ac (diff)
downloadlinux-947f9fcf674f8f3f09e01dfb5d8e564650875878.tar.xz
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>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_ring.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index db06fb0ddfd6..bea5a3448217 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -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.