virtio: Introduce virtqueue_drop_all procedure

Add procedure for fast drop of queued packets, acting like
pop and push without mapping the buffers into memory.
Signed-off-by: NYuri Benditovich <yuri.benditovich@daynix.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/virtio/virtio.c

@@ -783,6 +783,44 @@ err_undo_map:
     return NULL;
 }
 
+/* virtqueue_drop_all:
+ * @vq: The #VirtQueue
+ * Drops all queued buffers and indicates them to the guest
+ * as if they are done. Useful when buffers can not be
+ * processed but must be returned to the guest.
+ */
+unsigned int virtqueue_drop_all(VirtQueue *vq)
+{
+    unsigned int dropped = 0;
+    VirtQueueElement elem = {};
+    VirtIODevice *vdev = vq->vdev;
+    bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
+
+    if (unlikely(vdev->broken)) {
+        return 0;
+    }
+
+    while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) {
+        /* works similar to virtqueue_pop but does not map buffers
+        * and does not allocate any memory */
+        smp_rmb();
+        if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) {
+            break;
+        }
+        vq->inuse++;
+        vq->last_avail_idx++;
+        if (fEventIdx) {
+            vring_set_avail_event(vq, vq->last_avail_idx);
+        }
+        /* immediately push the element, nothing to unmap
+         * as both in_num and out_num are set to 0 */
+        virtqueue_push(vq, &elem, 0);
+        dropped++;
+    }
+
+    return dropped;
+}
+
 /* Reading and writing a structure directly to QEMUFile is *awful*, but
  * it is what QEMU has always done by mistake.  We can change it sooner
  * or later by bumping the version number of the affected vm states.

include/hw/virtio/virtio.h

@@ -173,6 +173,7 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 
 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem);
 void *virtqueue_pop(VirtQueue *vq, size_t sz);
+unsigned int virtqueue_drop_all(VirtQueue *vq);
 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
 void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem);
 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,