virtio: fixes

Most notably this drops the commits that trip up google cloud
 (turns out, it's any legacy device).
 Plus a kerneldoc patch.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio fixes from Michael Tsirkin:
 "Most notably this drops the commits that trip up google cloud (turns
  out, any legacy device).

  Plus a kerneldoc patch"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio: kerneldocs fixes and enhancements
  virtio: Revert "virtio: find_vqs() add arg sizes"
  virtio_vdpa: Revert "virtio_vdpa: support the arg sizes of find_vqs()"
  virtio_pci: Revert "virtio_pci: support the arg sizes of find_vqs()"
  virtio-mmio: Revert "virtio_mmio: support the arg sizes of find_vqs()"
  virtio: Revert "virtio: add helper virtio_find_vqs_ctx_size()"
  virtio_net: Revert "virtio_net: set the default max ring size by find_vqs()"

arch/um/drivers/virtio_uml.c

@@ -1011,7 +1011,7 @@ error_kzalloc:
 
 static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 		       struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		       const char * const names[], u32 sizes[], const bool *ctx,
+		       const char * const names[], const bool *ctx,
 		       struct irq_affinity *desc)
 {
 	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);

drivers/net/virtio_net.c

@@ -3432,29 +3432,6 @@ static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqu
 		   (unsigned int)GOOD_PACKET_LEN);
 }
 
-static void virtnet_config_sizes(struct virtnet_info *vi, u32 *sizes)
-{
-	u32 i, rx_size, tx_size;
-
-	if (vi->speed == SPEED_UNKNOWN || vi->speed < SPEED_10000) {
-		rx_size = 1024;
-		tx_size = 1024;
-
-	} else if (vi->speed < SPEED_40000) {
-		rx_size = 1024 * 4;
-		tx_size = 1024 * 4;
-
-	} else {
-		rx_size = 1024 * 8;
-		tx_size = 1024 * 8;
-	}
-
-	for (i = 0; i < vi->max_queue_pairs; i++) {
-		sizes[rxq2vq(i)] = rx_size;
-		sizes[txq2vq(i)] = tx_size;
-	}
-}
-
 static int virtnet_find_vqs(struct virtnet_info *vi)
 {
 	vq_callback_t **callbacks;
@@ -3462,7 +3439,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
 	int ret = -ENOMEM;
 	int i, total_vqs;
 	const char **names;
-	u32 *sizes;
 	bool *ctx;
 
 	/* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
@@ -3490,15 +3466,10 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
 		ctx = NULL;
 	}
 
-	sizes = kmalloc_array(total_vqs, sizeof(*sizes), GFP_KERNEL);
-	if (!sizes)
-		goto err_sizes;
-
 	/* Parameters for control virtqueue, if any */
 	if (vi->has_cvq) {
 		callbacks[total_vqs - 1] = NULL;
 		names[total_vqs - 1] = "control";
-		sizes[total_vqs - 1] = 64;
 	}
 
 	/* Allocate/initialize parameters for send/receive virtqueues */
@@ -3513,10 +3484,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
 			ctx[rxq2vq(i)] = true;
 	}
 
-	virtnet_config_sizes(vi, sizes);
+	ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks,
-
+				  names, ctx, NULL);
-	ret = virtio_find_vqs_ctx_size(vi->vdev, total_vqs, vqs, callbacks,
-				       names, sizes, ctx, NULL);
 	if (ret)
 		goto err_find;
 
@@ -3536,8 +3505,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
 
 
 err_find:
-	kfree(sizes);
-err_sizes:
 	kfree(ctx);
 err_ctx:
 	kfree(names);
@@ -3897,9 +3864,6 @@ static int virtnet_probe(struct virtio_device *vdev)
 		vi->curr_queue_pairs = num_online_cpus();
 	vi->max_queue_pairs = max_queue_pairs;
 
-	virtnet_init_settings(dev);
-	virtnet_update_settings(vi);
-
 	/* Allocate/initialize the rx/tx queues, and invoke find_vqs */
 	err = init_vqs(vi);
 	if (err)
@@ -3912,6 +3876,8 @@ static int virtnet_probe(struct virtio_device *vdev)
 	netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
 	netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
 
+	virtnet_init_settings(dev);
+
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
 		vi->failover = net_failover_create(vi->dev);
 		if (IS_ERR(vi->failover)) {

drivers/platform/mellanox/mlxbf-tmfifo.c

@@ -928,7 +928,6 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
 					struct virtqueue *vqs[],
 					vq_callback_t *callbacks[],
 					const char * const names[],
-					u32 sizes[],
 					const bool *ctx,
 					struct irq_affinity *desc)
 {

drivers/remoteproc/remoteproc_virtio.c

@@ -158,7 +158,6 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 				 struct virtqueue *vqs[],
 				 vq_callback_t *callbacks[],
 				 const char * const names[],
-				 u32 sizes[],
 				 const bool * ctx,
 				 struct irq_affinity *desc)
 {

drivers/s390/virtio/virtio_ccw.c

@@ -637,7 +637,6 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 			       struct virtqueue *vqs[],
 			       vq_callback_t *callbacks[],
 			       const char * const names[],
-			       u32 sizes[],
 			       const bool *ctx,
 			       struct irq_affinity *desc)
 {

drivers/virtio/virtio_mmio.c

@@ -360,7 +360,7 @@ static void vm_synchronize_cbs(struct virtio_device *vdev)
 
 static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index,
 				  void (*callback)(struct virtqueue *vq),
-				  const char *name, u32 size, bool ctx)
+				  const char *name, bool ctx)
 {
 	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
 	struct virtio_mmio_vq_info *info;
@@ -395,11 +395,8 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
 		goto error_new_virtqueue;
 	}
 
-	if (!size || size > num)
-		size = num;
-
 	/* Create the vring */
-	vq = vring_create_virtqueue(index, size, VIRTIO_MMIO_VRING_ALIGN, vdev,
+	vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
 				 true, true, ctx, vm_notify, callback, name);
 	if (!vq) {
 		err = -ENOMEM;
@@ -477,7 +474,6 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 		       struct virtqueue *vqs[],
 		       vq_callback_t *callbacks[],
 		       const char * const names[],
-		       u32 sizes[],
 		       const bool *ctx,
 		       struct irq_affinity *desc)
 {
@@ -503,7 +499,6 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 		}
 
 		vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     sizes ? sizes[i] : 0,
 				     ctx ? ctx[i] : false);
 		if (IS_ERR(vqs[i])) {
 			vm_del_vqs(vdev);

drivers/virtio/virtio_pci_common.c

@@ -174,7 +174,6 @@ error:
 static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,
 				     void (*callback)(struct virtqueue *vq),
 				     const char *name,
-				     u32 size,
 				     bool ctx,
 				     u16 msix_vec)
 {
@@ -187,7 +186,7 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int in
 	if (!info)
 		return ERR_PTR(-ENOMEM);
 
-	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, size, ctx,
+	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
 			      msix_vec);
 	if (IS_ERR(vq))
 		goto out_info;
@@ -284,7 +283,7 @@ void vp_del_vqs(struct virtio_device *vdev)
 
 static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], u32 sizes[], bool per_vq_vectors,
+		const char * const names[], bool per_vq_vectors,
 		const bool *ctx,
 		struct irq_affinity *desc)
 {
@@ -327,8 +326,8 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
 		else
 			msix_vec = VP_MSIX_VQ_VECTOR;
 		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     sizes ? sizes[i] : 0,
+				     ctx ? ctx[i] : false,
-				     ctx ? ctx[i] : false, msix_vec);
+				     msix_vec);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto error_find;
@@ -358,7 +357,7 @@ error_find:
 
 static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
 		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], u32 sizes[], const bool *ctx)
+		const char * const names[], const bool *ctx)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	int i, err, queue_idx = 0;
@@ -380,7 +379,6 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
 			continue;
 		}
 		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     sizes ? sizes[i] : 0,
 				     ctx ? ctx[i] : false,
 				     VIRTIO_MSI_NO_VECTOR);
 		if (IS_ERR(vqs[i])) {
@@ -398,21 +396,21 @@ out_del_vqs:
 /* the config->find_vqs() implementation */
 int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], u32 sizes[], const bool *ctx,
+		const char * const names[], const bool *ctx,
 		struct irq_affinity *desc)
 {
 	int err;
 
 	/* Try MSI-X with one vector per queue. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, true, ctx, desc);
+	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
 	if (!err)
 		return 0;
 	/* Fallback: MSI-X with one vector for config, one shared for queues. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, false, ctx, desc);
+	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
 	if (!err)
 		return 0;
 	/* Finally fall back to regular interrupts. */
-	return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, sizes, ctx);
+	return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
 }
 
 const char *vp_bus_name(struct virtio_device *vdev)

drivers/virtio/virtio_pci_common.h

@@ -80,7 +80,6 @@ struct virtio_pci_device {
 				      unsigned int idx,
 				      void (*callback)(struct virtqueue *vq),
 				      const char *name,
-				      u32 size,
 				      bool ctx,
 				      u16 msix_vec);
 	void (*del_vq)(struct virtio_pci_vq_info *info);
@@ -111,7 +110,7 @@ void vp_del_vqs(struct virtio_device *vdev);
 /* the config->find_vqs() implementation */
 int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], u32 sizes[], const bool *ctx,
+		const char * const names[], const bool *ctx,
 		struct irq_affinity *desc);
 const char *vp_bus_name(struct virtio_device *vdev);
 

drivers/virtio/virtio_pci_legacy.c

@@ -112,7 +112,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				  unsigned int index,
 				  void (*callback)(struct virtqueue *vq),
 				  const char *name,
-				  u32 size,
 				  bool ctx,
 				  u16 msix_vec)
 {
@@ -126,13 +125,10 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))
 		return ERR_PTR(-ENOENT);
 
-	if (!size || size > num)
-		size = num;
-
 	info->msix_vector = msix_vec;
 
 	/* create the vring */
-	vq = vring_create_virtqueue(index, size,
+	vq = vring_create_virtqueue(index, num,
 				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
 				    true, false, ctx,
 				    vp_notify, callback, name);

drivers/virtio/virtio_pci_modern.c

@@ -293,7 +293,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				  unsigned int index,
 				  void (*callback)(struct virtqueue *vq),
 				  const char *name,
-				  u32 size,
 				  bool ctx,
 				  u16 msix_vec)
 {
@@ -311,18 +310,15 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	if (!num || vp_modern_get_queue_enable(mdev, index))
 		return ERR_PTR(-ENOENT);
 
-	if (!size || size > num)
+	if (num & (num - 1)) {
-		size = num;
+		dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
-
-	if (size & (size - 1)) {
-		dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", size);
 		return ERR_PTR(-EINVAL);
 	}
 
 	info->msix_vector = msix_vec;
 
 	/* create the vring */
-	vq = vring_create_virtqueue(index, size,
+	vq = vring_create_virtqueue(index, num,
 				    SMP_CACHE_BYTES, &vp_dev->vdev,
 				    true, true, ctx,
 				    vp_notify, callback, name);
@@ -351,15 +347,12 @@ err:
 static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 			      struct virtqueue *vqs[],
 			      vq_callback_t *callbacks[],
-			      const char * const names[],
+			      const char * const names[], const bool *ctx,
-			      u32 sizes[],
-			      const bool *ctx,
 			      struct irq_affinity *desc)
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	struct virtqueue *vq;
-	int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, sizes, ctx,
+	int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);
-			     desc);
 
 	if (rc)
 		return rc;

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);

drivers/virtio/virtio_vdpa.c

@@ -131,7 +131,7 @@ static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
 static struct virtqueue *
 virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		     void (*callback)(struct virtqueue *vq),
-		     const char *name, u32 size, bool ctx)
+		     const char *name, bool ctx)
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
@@ -168,17 +168,14 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		goto error_new_virtqueue;
 	}
 
-	if (!size || size > max_num)
-		size = max_num;
-
 	if (ops->get_vq_num_min)
 		min_num = ops->get_vq_num_min(vdpa);
 
-	may_reduce_num = (size == min_num) ? false : true;
+	may_reduce_num = (max_num == min_num) ? false : true;
 
 	/* Create the vring */
 	align = ops->get_vq_align(vdpa);
-	vq = vring_create_virtqueue(index, size, align, vdev,
+	vq = vring_create_virtqueue(index, max_num, align, vdev,
 				    true, may_reduce_num, ctx,
 				    virtio_vdpa_notify, callback, name);
 	if (!vq) {
@@ -272,7 +269,6 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 				struct virtqueue *vqs[],
 				vq_callback_t *callbacks[],
 				const char * const names[],
-				u32 sizes[],
 				const bool *ctx,
 				struct irq_affinity *desc)
 {
@@ -288,9 +284,9 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 			continue;
 		}
 
-		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++, callbacks[i],
+		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
-						  names[i], sizes ? sizes[i] : 0,
+					      callbacks[i], names[i], ctx ?
-						  ctx ? ctx[i] : false);
+					      ctx[i] : false);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto err_setup_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

@@ -55,7 +55,6 @@ struct virtio_shm_region {
  *		include a NULL entry for vqs that do not need a callback
  *	names: array of virtqueue names (mainly for debugging)
  *		include a NULL entry for vqs unused by driver
- *	sizes: array of virtqueue sizes
  *	Returns 0 on success or error status
  * @del_vqs: free virtqueues found by find_vqs().
  * @synchronize_cbs: synchronize with the virtqueue callbacks (optional)
@@ -104,9 +103,7 @@ struct virtio_config_ops {
 	void (*reset)(struct virtio_device *vdev);
 	int (*find_vqs)(struct virtio_device *, unsigned nvqs,
 			struct virtqueue *vqs[], vq_callback_t *callbacks[],
-			const char * const names[],
+			const char * const names[], const bool *ctx,
-			u32 sizes[],
-			const bool *ctx,
 			struct irq_affinity *desc);
 	void (*del_vqs)(struct virtio_device *);
 	void (*synchronize_cbs)(struct virtio_device *);
@@ -215,7 +212,7 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
 	const char *names[] = { n };
 	struct virtqueue *vq;
 	int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL,
-					 NULL, NULL);
+					 NULL);
 	if (err < 0)
 		return ERR_PTR(err);
 	return vq;
@@ -227,8 +224,7 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 			const char * const names[],
 			struct irq_affinity *desc)
 {
-	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL,
+	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, desc);
-				      NULL, desc);
 }
 
 static inline
@@ -237,25 +233,13 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
 			const char * const names[], const bool *ctx,
 			struct irq_affinity *desc)
 {
-	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL,
+	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx,
-				      ctx, desc);
+				      desc);
-}
-
-static inline
-int virtio_find_vqs_ctx_size(struct virtio_device *vdev, u32 nvqs,
-			     struct virtqueue *vqs[],
-			     vq_callback_t *callbacks[],
-			     const char * const names[],
-			     u32 sizes[],
-			     const bool *ctx, struct irq_affinity *desc)
-{
-	return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, sizes,
-				      ctx, desc);
 }
 
 /**
  * virtio_synchronize_cbs - synchronize with virtqueue callbacks
- * @vdev: the device
+ * @dev: the virtio device
  */
 static inline
 void virtio_synchronize_cbs(struct virtio_device *dev)
@@ -274,7 +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.
  *
@@ -322,7 +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;
 };