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List:       linux-kernel
Subject:    [RFC virtio-next 2/4] include/vring.h: Add support for reversed vritio rings.
From:       Sjur Brændeland <sjur () brendeland ! net>
Date:       2012-10-31 22:46:52
Message-ID: 1351723614-4145-3-git-send-email-sjur () brendeland ! net
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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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