0, elem->out_sg[i].iov_len);
}
+/* virtqueue_detach_element:
+ * @vq: The #VirtQueue
+ * @elem: The #VirtQueueElement
+ * @len: number of bytes written
+ *
+ * Detach the element from the virtqueue. This function is suitable for device
+ * reset or other situations where a #VirtQueueElement is simply freed and will
+ * not be pushed or discarded.
+ */
+void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len)
+{
+ vq->inuse--;
+ virtqueue_unmap_sg(vq, elem, len);
+}
+
+/* virtqueue_discard:
+ * @vq: The #VirtQueue
+ * @elem: The #VirtQueueElement
+ * @len: number of bytes written
+ *
+ * Pretend the most recent element wasn't popped from the virtqueue. The next
+ * call to virtqueue_pop() will refetch the element.
+ */
void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len)
{
vq->last_avail_idx--;
- vq->inuse--;
- virtqueue_unmap_sg(vq, elem, len);
+ virtqueue_detach_element(vq, elem, len);
}
/* virtqueue_rewind:
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
void virtqueue_flush(VirtQueue *vq, unsigned int count);
+void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len);
void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
bool virtqueue_rewind(VirtQueue *vq, unsigned int num);