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Subject[RFC virtio-next 2/4] include/vring.h: Add support for reversed vritio rings.
Date
From: Sjur Brændeland <sjur.brandeland@stericsson.com>

Add last avilable index to the vring_virtqueue structure,
this is done to prepare for implementation of the reversed vring.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
---
drivers/virtio/vring.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/virtio/vring.h b/drivers/virtio/vring.h
index b997fc3..3b53961 100644
--- a/drivers/virtio/vring.h
+++ b/drivers/virtio/vring.h
@@ -51,6 +51,9 @@ struct vring_virtqueue
/* Last used index we've seen. */
u16 last_used_idx;

+ /* Last avail index seen. NOTE: Only used for reversed rings.*/
+ u16 last_avail_idx;
+
/* How to notify other side. FIXME: commonalize hcalls! */
void (*notify)(struct virtqueue *vq);

--
1.7.9.5
--
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