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Subject[PATCH 1 of 5] virtio: document functions better
Date
From
The old documentation is left over from when we used a structure with
strategy pointers.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
include/linux/virtio.h | 130 ++++++++++++++++++++++++++++++++-----------------
1 file changed, 87 insertions(+), 43 deletions(-)

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -26,52 +26,22 @@ struct virtqueue {
};

/**
- * operations for virtqueue
- * virtqueue_add_buf: expose buffer to other end
- * vq: the struct virtqueue we're talking about.
- * sg: the description of the buffer(s).
- * out_num: the number of sg readable by other side
- * in_num: the number of sg which are writable (after readable ones)
- * data: the token identifying the buffer.
- * gfp: how to do memory allocations (if necessary).
- * Returns remaining capacity of queue (sg segments) or a negative error.
- * virtqueue_kick: update after add_buf
- * vq: the struct virtqueue
- * After one or more add_buf calls, invoke this to kick the other side.
- * virtqueue_get_buf: get the next used buffer
- * vq: the struct virtqueue we're talking about.
- * len: the length written into the buffer
- * Returns NULL or the "data" token handed to add_buf.
- * virtqueue_disable_cb: disable callbacks
- * vq: the struct virtqueue we're talking about.
- * Note that this is not necessarily synchronous, hence unreliable and only
- * useful as an optimization.
- * virtqueue_enable_cb: restart callbacks after disable_cb.
- * vq: the struct virtqueue we're talking about.
- * 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.
- * virtqueue_enable_cb_delayed: restart callbacks after disable_cb.
- * vq: the struct virtqueue we're talking about.
- * This re-enables callbacks but hints to the other side to delay
- * interrupts until most of the available buffers have been processed;
- * it returns "false" if there are many pending buffers in the queue,
- * to detect a possible race between the driver checking for more work,
- * and enabling callbacks.
- * virtqueue_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
- * virtqueue_get_vring_size: return the size of the virtqueue's vring
- * vq: the struct virtqueue containing the vring of interest.
- * Returns the size of the vring.
+ * virtqueue_add_buf_gfp - expose buffer to other end
+ * @vq: the struct virtqueue we're talking about.
+ * @sg: the description of the buffer(s).
+ * @out_num: the number of sg readable by other side
+ * @in_num: the number of sg which are writable (after readable ones)
+ * @data: the token identifying the buffer.
+ * @gfp: how to do memory allocations (if necessary).
*
- * Locking rules are straightforward: the driver is responsible for
- * locking. No two operations may be invoked simultaneously, with the exception
- * of virtqueue_disable_cb.
+ * Caller must ensure we don't call this with other virtqueue operations
+ * at the same time (except where noted).
*
- * All operations can be called in any context.
+ * Returns remaining capacity of queue or a negative error
+ * (ie. ENOSPC). Note that it only really makes sense to treat all
+ * positive return values as "available": indirect buffers mean that
+ * we can put an entire sg[] array inside a single queue entry.
*/
-
int virtqueue_add_buf_gfp(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
@@ -88,18 +58,92 @@ static inline int virtqueue_add_buf(stru
return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
}

+/**
+ * virtqueue_kick - update after add_buf
+ * @vq: the struct virtqueue
+ *
+ * After one or more virtqueue_add_buf_gfp calls, invoke this to kick
+ * the other side.
+ *
+ * Caller must ensure we don't call this with other virtqueue
+ * operations at the same time (except where noted).
+ */
void virtqueue_kick(struct virtqueue *vq);

+/**
+ * virtqueue_get_buf - get the next used buffer
+ * @vq: the struct virtqueue we're talking about.
+ * @len: the length written into the buffer
+ *
+ * If the driver wrote data into the buffer, @len will be set to the
+ * amount written. This means you don't need to clear the buffer
+ * beforehand to ensure there's no data leakage in the case of short
+ * writes.
+ *
+ * Caller must ensure we don't call this with other virtqueue
+ * operations at the same time (except where noted).
+ *
+ * Returns NULL if there are no used buffers, or the "data" token
+ * handed to virtqueue_add_buf_gfp().
+ */
void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);

+/**
+ * virtqueue_disable_cb - disable callbacks
+ * @vq: the struct virtqueue we're talking about.
+ *
+ * Note that this is not necessarily synchronous, hence unreliable and only
+ * useful as an optimization.
+ *
+ * Unlike other operations, this need not be serialized.
+ */
void virtqueue_disable_cb(struct virtqueue *vq);

+/**
+ * virtqueue_enable_cb - restart callbacks after disable_cb.
+ * @vq: the struct virtqueue we're talking about.
+ *
+ * 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.
+ *
+ * Caller must ensure we don't call this with other virtqueue
+ * operations at the same time (except where noted).
+ */
bool virtqueue_enable_cb(struct virtqueue *vq);

+/**
+ * virtqueue_enable_cb_delayed - restart callbacks after disable_cb.
+ * @vq: the struct virtqueue we're talking about.
+ *
+ * This re-enables callbacks but hints to the other side to delay
+ * interrupts until most of the available buffers have been processed;
+ * it returns "false" if there are many pending buffers in the queue,
+ * to detect a possible race between the driver checking for more work,
+ * and enabling callbacks.
+ *
+ * Caller must ensure we don't call this with other virtqueue
+ * operations at the same time (except where noted).
+ */
bool virtqueue_enable_cb_delayed(struct virtqueue *vq);

+/**
+ * virtqueue_detach_unused_buf - detach first unused buffer
+ * @vq: the struct virtqueue we're talking about.
+ *
+ * Returns NULL or the "data" token handed to virtqueue_add_buf_gfp().
+ * This is not valid on an active queue; it is useful only for device
+ * shutdown.
+ */
void *virtqueue_detach_unused_buf(struct virtqueue *vq);

+/**
+ * virtqueue_get_vring_size - return the size of the virtqueue's vring
+ * @vq: the struct virtqueue containing the vring of interest.
+ *
+ * Returns the size of the vring. This is mainly used for boasting to
+ * userspace. Unlike other operations, this need not be serialized.
+ */
unsigned int virtqueue_get_vring_size(struct virtqueue *vq);

/**



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