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authorShirley Ma <mashirle@us.ibm.com>2010-01-29 03:19:05 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-02 15:55:42 -0800
commitf9bfbebf34eab707b065116cdc9699d25ba4252a (patch)
tree8cecf55980c72085dcc6e6af39bdfc7cccf18b69 /include
parent28aecb9d7728dc26bf03ce7925fe622023a83a2a (diff)
downloadop-kernel-dev-f9bfbebf34eab707b065116cdc9699d25ba4252a.zip
op-kernel-dev-f9bfbebf34eab707b065116cdc9699d25ba4252a.tar.gz
virtio: Add ability to detach unused buffers from vrings
There's currently no way for a virtio driver to ask for unused buffers, so it has to keep a list itself to reclaim them at shutdown. This is redundant, since virtio_ring stores that information. So add a new hook to do this. Signed-off-by: Shirley Ma <xma@us.ibm.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/virtio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 057a2e0..f508c65 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -51,6 +51,9 @@ struct virtqueue {
* This re-enables callbacks; it returns "false" if there are pending
* buffers in the queue, to detect a possible race between the driver
* checking for more work, and enabling callbacks.
+ * @detach_unused_buf: detach first unused buffer
+ * vq: the struct virtqueue we're talking about.
+ * Returns NULL or the "data" token handed to add_buf
*
* Locking rules are straightforward: the driver is responsible for
* locking. No two operations may be invoked simultaneously, with the exception
@@ -71,6 +74,7 @@ struct virtqueue_ops {
void (*disable_cb)(struct virtqueue *vq);
bool (*enable_cb)(struct virtqueue *vq);
+ void *(*detach_unused_buf)(struct virtqueue *vq);
};
/**
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