[RFC v3 3/6] virtio: virtqueue_ordered_fill - VIRTIO_F_IN_ORDER support

[Jonah Palmer]

Add VIRTIO_F_IN_ORDER feature support for virtqueue_fill operations.

The goal of the virtqueue_fill operation when the VIRTIO_F_IN_ORDER
feature has been negotiated is to search for this now-used element,
set its length, and mark the element as filled in the VirtQueue's
used_elems array.

By marking the element as filled, it will indicate that this element is
ready to be flushed, so long as the element is in-order.

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
 hw/virtio/virtio.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 3ad58100b2..0730f26f74 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -872,6 +872,28 @@ static void virtqueue_packed_fill(VirtQueue *vq, const 
VirtQueueElement *elem,
     vq->used_elems[idx].ndescs = elem->ndescs;
 }
 
+static void virtqueue_ordered_fill(VirtQueue *vq, const VirtQueueElement *elem,
+                                   unsigned int len)
+{
+    unsigned int i = vq->used_idx;
+
+    /* Search for element in vq->used_elems */
+    while (i != vq->last_avail_idx) {
+        /* Found element, set length and mark as filled */
+        if (vq->used_elems[i].index == elem->index) {
+            vq->used_elems[i].len = len;
+            vq->used_elems[i].filled = true;
+            break;
+        }
+
+        i += vq->used_elems[i].ndescs;
+
+        if (i >= vq->vring.num) {
+            i -= vq->vring.num;
+        }
+    }
+}
+
 static void virtqueue_packed_fill_desc(VirtQueue *vq,
                                        const VirtQueueElement *elem,
                                        unsigned int idx,
@@ -922,7 +944,9 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement 
*elem,
         return;
     }
 
-    if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
+    if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_IN_ORDER)) {
+        virtqueue_ordered_fill(vq, elem, len);
+    } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
         virtqueue_packed_fill(vq, elem, len, idx);
     } else {
         virtqueue_split_fill(vq, elem, len, idx);
-- 
2.39.3