X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=include%2Fuapi%2Flinux%2Fvirtio_ring.h;h=a3318f31e8e7fd05f317c595e8c4ce3bc3595fac;hb=b28e0506fafd9c987bba7a6a71ea02a37fcabdea;hp=61c818a7fe70dfca4d26b2ef7f4269e9da22233f;hpb=385336e321c41b5174055c0194b60c19a27cc5c5;p=cascardo%2Flinux.git

diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 61c818a7fe70..a3318f31e8e7 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -101,6 +101,13 @@ struct vring {
 	struct vring_used *used;
 };
 
+/* Alignment requirements for vring elements.
+ * When using pre-virtio 1.0 layout, these fall out naturally.
+ */
+#define VRING_AVAIL_ALIGN_SIZE 2
+#define VRING_USED_ALIGN_SIZE 4
+#define VRING_DESC_ALIGN_SIZE 16
+
 /* The standard layout for the ring is a continuous chunk of memory which looks
  * like this.  We assume num is a power of 2.
  *