virtio: kerneldocs fixes and enhancements

Fix variable names in some kerneldocs, naming in others.
Add kerneldocs for struct vring_desc and vring_interrupt.

Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Message-Id: <20220810094004.1250-2-ricardo.canuelo@collabora.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>

drivers/virtio/virtio_ring.c

@@ -2426,6 +2426,14 @@ static inline bool more_used(const struct vring_virtqueue *vq)
 	return vq->packed_ring ? more_used_packed(vq) : more_used_split(vq);
 }
 
+/**
+ * vring_interrupt - notify a virtqueue on an interrupt
+ * @irq: the IRQ number (ignored)
+ * @_vq: the struct virtqueue to notify
+ *
+ * Calls the callback function of @_vq to process the virtqueue
+ * notification.
+ */
 irqreturn_t vring_interrupt(int irq, void *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);

include/linux/virtio.h

@@ -11,7 +11,7 @@
 #include <linux/gfp.h>
 
 /**
- * virtqueue - a queue to register buffers for sending or receiving.
+ * struct virtqueue - a queue to register buffers for sending or receiving.
  * @list: the chain of virtqueues for this device
  * @callback: the function to call when buffers are consumed (can be NULL).
  * @name: the name of this virtqueue (mainly for debugging)
@@ -97,7 +97,7 @@ int virtqueue_resize(struct virtqueue *vq, u32 num,
 		     void (*recycle)(struct virtqueue *vq, void *buf));
 
 /**
- * virtio_device - representation of a device using virtio
+ * struct virtio_device - representation of a device using virtio
  * @index: unique position on the virtio bus
  * @failed: saved value for VIRTIO_CONFIG_S_FAILED bit (for restore)
  * @config_enabled: configuration change reporting enabled
@@ -156,7 +156,7 @@ size_t virtio_max_dma_size(struct virtio_device *vdev);
 	list_for_each_entry(vq, &vdev->vqs, list)
 
 /**
- * virtio_driver - operations for a virtio I/O driver
+ * struct virtio_driver - operations for a virtio I/O driver
  * @driver: underlying device driver (populate name and owner).
  * @id_table: the ids serviced by this driver.
  * @feature_table: an array of feature numbers supported by this driver.

include/linux/virtio_config.h

@@ -239,7 +239,7 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
 
 /**
  * virtio_synchronize_cbs - synchronize with virtqueue callbacks
- * @vdev: the device
+ * @dev: the virtio device
  */
 static inline
 void virtio_synchronize_cbs(struct virtio_device *dev)
@@ -258,7 +258,7 @@ void virtio_synchronize_cbs(struct virtio_device *dev)
 
 /**
  * virtio_device_ready - enable vq use in probe function
- * @vdev: the device
+ * @dev: the virtio device
  *
  * Driver must call this to use vqs in the probe function.
  *
@@ -306,7 +306,7 @@ const char *virtio_bus_name(struct virtio_device *vdev)
 /**
  * virtqueue_set_affinity - setting affinity for a virtqueue
  * @vq: the virtqueue
- * @cpu: the cpu no.
+ * @cpu_mask: the cpu mask
  *
  * Pay attention the function are best-effort: the affinity hint may not be set
  * due to config support, irq type and sharing.

include/uapi/linux/virtio_ring.h

@@ -93,15 +93,21 @@
 #define VRING_USED_ALIGN_SIZE 4
 #define VRING_DESC_ALIGN_SIZE 16
 
-/* Virtio ring descriptors: 16 bytes.  These can chain together via "next". */
+/**
+ * struct vring_desc - Virtio ring descriptors,
+ * 16 bytes long. These can chain together via @next.
+ *
+ * @addr: buffer address (guest-physical)
+ * @len: buffer length
+ * @flags: descriptor flags
+ * @next: index of the next descriptor in the chain,
+ *        if the VRING_DESC_F_NEXT flag is set. We chain unused
+ *        descriptors via this, too.
+ */
 struct vring_desc {
-	/* Address (guest-physical). */
 	__virtio64 addr;
-	/* Length. */
 	__virtio32 len;
-	/* The flags as indicated above. */
 	__virtio16 flags;
-	/* We chain unused descriptors via this, too */
 	__virtio16 next;
 };