[RFC 1/8] virtio: Define InOrderVQElement

[Jonah Palmer <jonah.palmer@oracle.com>]

Define the InOrderVQElement structure for the VIRTIO_F_IN_ORDER
transport feature implementation.

The InOrderVQElement structure is used to encapsulate out-of-order
VirtQueueElement data that was processed by the host. This data
includes:
 - The processed VirtQueueElement (elem)
 - Length of data (len)
 - VirtQueueElement array index (idx)
 - Number of processed VirtQueueElements (count)

InOrderVQElements will be stored in a buffering mechanism until an
order can be achieved.

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
 include/hw/virtio/virtio.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index b3c74a1bca..c8aa435a5e 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -77,6 +77,13 @@ typedef struct VirtQueueElement
     struct iovec *out_sg;
 } VirtQueueElement;
 
+typedef struct InOrderVQElement {
+    const VirtQueueElement *elem;
+    unsigned int len;
+    unsigned int idx;
+    unsigned int count;
+} InOrderVQElement;
+
 #define VIRTIO_QUEUE_MAX 1024
 
 #define VIRTIO_NO_VECTOR 0xffff
-- 
2.39.3