vdpa: Provide interface to read driver features

Provide an interface to read the negotiated features. This is needed
when building the netlink message in vdpa_dev_net_config_fill().

Also fix the implementation of vdpa_dev_net_config_fill() to use the
negotiated features instead of the device features.

To make APIs clearer, make the following name changes to struct
vdpa_config_ops so they better describe their operations:

get_features -> get_device_features
set_features -> set_driver_features

Finally, add get_driver_features to return the negotiated features and
add implementation to all the upstream drivers.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-2-elic@nvidia.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/alibaba/eni_vdpa.c

@@ -58,7 +58,7 @@ static struct virtio_pci_legacy_device *vdpa_to_ldev(struct vdpa_device *vdpa)
 	return &eni_vdpa->ldev;
 }
 
-static u64 eni_vdpa_get_features(struct vdpa_device *vdpa)
+static u64 eni_vdpa_get_device_features(struct vdpa_device *vdpa)
 {
 	struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
 	u64 features = vp_legacy_get_features(ldev);
@@ -69,7 +69,7 @@ static u64 eni_vdpa_get_features(struct vdpa_device *vdpa)
 	return features;
 }
 
-static int eni_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
+static int eni_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
 {
 	struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
 
@@ -84,6 +84,13 @@ static int eni_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
 	return 0;
 }
 
+static u64 eni_vdpa_get_driver_features(struct vdpa_device *vdpa)
+{
+	struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
+
+	return vp_legacy_get_driver_features(ldev);
+}
+
 static u8 eni_vdpa_get_status(struct vdpa_device *vdpa)
 {
 	struct virtio_pci_legacy_device *ldev = vdpa_to_ldev(vdpa);
@@ -401,8 +408,9 @@ static void eni_vdpa_set_config_cb(struct vdpa_device *vdpa,
 }
 
 static const struct vdpa_config_ops eni_vdpa_ops = {
-	.get_features	= eni_vdpa_get_features,
-	.set_features	= eni_vdpa_set_features,
+	.get_device_features = eni_vdpa_get_device_features,
+	.set_driver_features = eni_vdpa_set_driver_features,
+	.get_driver_features = eni_vdpa_get_driver_features,
 	.get_status	= eni_vdpa_get_status,
 	.set_status	= eni_vdpa_set_status,
 	.reset		= eni_vdpa_reset,

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -169,7 +169,7 @@ static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
 	return &adapter->vf;
 }
 
-static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
+static u64 ifcvf_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
@@ -187,7 +187,7 @@ static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
 	return features;
 }
 
-static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
+static int ifcvf_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
 	int ret;
@@ -201,6 +201,13 @@ static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
 	return 0;
 }
 
+static u64 ifcvf_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
+{
+	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
+
+	return vf->req_features;
+}
+
 static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
 {
 	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
@@ -426,8 +433,9 @@ static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_devic
  * implemented set_map()/dma_map()/dma_unmap()
  */
 static const struct vdpa_config_ops ifc_vdpa_ops = {
-	.get_features	= ifcvf_vdpa_get_features,
-	.set_features	= ifcvf_vdpa_set_features,
+	.get_device_features = ifcvf_vdpa_get_device_features,
+	.set_driver_features = ifcvf_vdpa_set_driver_features,
+	.get_driver_features = ifcvf_vdpa_get_driver_features,
 	.get_status	= ifcvf_vdpa_get_status,
 	.set_status	= ifcvf_vdpa_set_status,
 	.reset		= ifcvf_vdpa_reset,

drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -1878,7 +1878,7 @@ static u64 mlx_to_vritio_features(u16 dev_features)
 	return result;
 }
 
-static u64 mlx5_vdpa_get_features(struct vdpa_device *vdev)
+static u64 mlx5_vdpa_get_device_features(struct vdpa_device *vdev)
 {
 	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
 	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
@@ -1971,7 +1971,7 @@ static void update_cvq_info(struct mlx5_vdpa_dev *mvdev)
 	}
 }
 
-static int mlx5_vdpa_set_features(struct vdpa_device *vdev, u64 features)
+static int mlx5_vdpa_set_driver_features(struct vdpa_device *vdev, u64 features)
 {
 	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
 	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
@@ -2338,6 +2338,13 @@ static int mlx5_get_vq_irq(struct vdpa_device *vdv, u16 idx)
 	return -EOPNOTSUPP;
 }
 
+static u64 mlx5_vdpa_get_driver_features(struct vdpa_device *vdev)
+{
+	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
+
+	return mvdev->actual_features;
+}
+
 static const struct vdpa_config_ops mlx5_vdpa_ops = {
 	.set_vq_address = mlx5_vdpa_set_vq_address,
 	.set_vq_num = mlx5_vdpa_set_vq_num,
@@ -2350,8 +2357,9 @@ static const struct vdpa_config_ops mlx5_vdpa_ops = {
 	.get_vq_notification = mlx5_get_vq_notification,
 	.get_vq_irq = mlx5_get_vq_irq,
 	.get_vq_align = mlx5_vdpa_get_vq_align,
-	.get_features = mlx5_vdpa_get_features,
-	.set_features = mlx5_vdpa_set_features,
+	.get_device_features = mlx5_vdpa_get_device_features,
+	.set_driver_features = mlx5_vdpa_set_driver_features,
+	.get_driver_features = mlx5_vdpa_get_driver_features,
 	.set_config_cb = mlx5_vdpa_set_config_cb,
 	.get_vq_num_max = mlx5_vdpa_get_vq_num_max,
 	.get_device_id = mlx5_vdpa_get_device_id,

drivers/vdpa/vdpa.c

@@ -808,7 +808,7 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
 	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
 		return -EMSGSIZE;
 
-	features = vdev->config->get_features(vdev);
+	features = vdev->config->get_driver_features(vdev);
 
 	return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
 }

drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -399,14 +399,14 @@ static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
 	return VDPASIM_QUEUE_ALIGN;
 }
 
-static u64 vdpasim_get_features(struct vdpa_device *vdpa)
+static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 
 	return vdpasim->dev_attr.supported_features;
 }
 
-static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
+static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
 {
 	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 
@@ -419,6 +419,13 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
 	return 0;
 }
 
+static u64 vdpasim_get_driver_features(struct vdpa_device *vdpa)
+{
+	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+	return vdpasim->features;
+}
+
 static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
 				  struct vdpa_callback *cb)
 {
@@ -613,8 +620,9 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
 	.set_vq_state           = vdpasim_set_vq_state,
 	.get_vq_state           = vdpasim_get_vq_state,
 	.get_vq_align           = vdpasim_get_vq_align,
-	.get_features           = vdpasim_get_features,
-	.set_features           = vdpasim_set_features,
+	.get_device_features    = vdpasim_get_device_features,
+	.set_driver_features    = vdpasim_set_driver_features,
+	.get_driver_features    = vdpasim_get_driver_features,
 	.set_config_cb          = vdpasim_set_config_cb,
 	.get_vq_num_max         = vdpasim_get_vq_num_max,
 	.get_device_id          = vdpasim_get_device_id,
@@ -642,8 +650,9 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
 	.set_vq_state           = vdpasim_set_vq_state,
 	.get_vq_state           = vdpasim_get_vq_state,
 	.get_vq_align           = vdpasim_get_vq_align,
-	.get_features           = vdpasim_get_features,
-	.set_features           = vdpasim_set_features,
+	.get_device_features    = vdpasim_get_device_features,
+	.set_driver_features    = vdpasim_set_driver_features,
+	.get_driver_features    = vdpasim_get_driver_features,
 	.set_config_cb          = vdpasim_set_config_cb,
 	.get_vq_num_max         = vdpasim_get_vq_num_max,
 	.get_device_id          = vdpasim_get_device_id,

drivers/vdpa/vdpa_user/vduse_dev.c

@@ -573,14 +573,14 @@ static u32 vduse_vdpa_get_vq_align(struct vdpa_device *vdpa)
 	return dev->vq_align;
 }
 
-static u64 vduse_vdpa_get_features(struct vdpa_device *vdpa)
+static u64 vduse_vdpa_get_device_features(struct vdpa_device *vdpa)
 {
 	struct vduse_dev *dev = vdpa_to_vduse(vdpa);
 
 	return dev->device_features;
 }
 
-static int vduse_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
+static int vduse_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
 {
 	struct vduse_dev *dev = vdpa_to_vduse(vdpa);
 
@@ -588,6 +588,13 @@ static int vduse_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
 	return 0;
 }
 
+static u64 vduse_vdpa_get_driver_features(struct vdpa_device *vdpa)
+{
+	struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+	return dev->driver_features;
+}
+
 static void vduse_vdpa_set_config_cb(struct vdpa_device *vdpa,
 				  struct vdpa_callback *cb)
 {
@@ -721,8 +728,9 @@ static const struct vdpa_config_ops vduse_vdpa_config_ops = {
 	.set_vq_state		= vduse_vdpa_set_vq_state,
 	.get_vq_state		= vduse_vdpa_get_vq_state,
 	.get_vq_align		= vduse_vdpa_get_vq_align,
-	.get_features		= vduse_vdpa_get_features,
-	.set_features		= vduse_vdpa_set_features,
+	.get_device_features	= vduse_vdpa_get_device_features,
+	.set_driver_features	= vduse_vdpa_set_driver_features,
+	.get_driver_features	= vduse_vdpa_get_driver_features,
 	.set_config_cb		= vduse_vdpa_set_config_cb,
 	.get_vq_num_max		= vduse_vdpa_get_vq_num_max,
 	.get_device_id		= vduse_vdpa_get_device_id,

drivers/vdpa/virtio_pci/vp_vdpa.c

@@ -53,14 +53,14 @@ static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa)
 	return &vp_vdpa->mdev;
 }
 
-static u64 vp_vdpa_get_features(struct vdpa_device *vdpa)
+static u64 vp_vdpa_get_device_features(struct vdpa_device *vdpa)
 {
 	struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
 
 	return vp_modern_get_features(mdev);
 }
 
-static int vp_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
+static int vp_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
 {
 	struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
 
@@ -69,6 +69,13 @@ static int vp_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
 	return 0;
 }
 
+static u64 vp_vdpa_get_driver_features(struct vdpa_device *vdpa)
+{
+	struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
+
+	return vp_modern_get_driver_features(mdev);
+}
+
 static u8 vp_vdpa_get_status(struct vdpa_device *vdpa)
 {
 	struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
@@ -415,8 +422,9 @@ vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
 }
 
 static const struct vdpa_config_ops vp_vdpa_ops = {
-	.get_features	= vp_vdpa_get_features,
-	.set_features	= vp_vdpa_set_features,
+	.get_device_features = vp_vdpa_get_device_features,
+	.set_driver_features = vp_vdpa_set_driver_features,
+	.get_driver_features = vp_vdpa_get_driver_features,
 	.get_status	= vp_vdpa_get_status,
 	.set_status	= vp_vdpa_set_status,
 	.reset		= vp_vdpa_reset,

drivers/vhost/vdpa.c

@@ -262,7 +262,7 @@ static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep)
 	const struct vdpa_config_ops *ops = vdpa->config;
 	u64 features;
 
-	features = ops->get_features(vdpa);
+	features = ops->get_device_features(vdpa);
 
 	if (copy_to_user(featurep, &features, sizeof(features)))
 		return -EFAULT;

drivers/virtio/virtio_vdpa.c

@@ -308,7 +308,7 @@ static u64 virtio_vdpa_get_features(struct virtio_device *vdev)
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
 	const struct vdpa_config_ops *ops = vdpa->config;
 
-	return ops->get_features(vdpa);
+	return ops->get_device_features(vdpa);
 }
 
 static int virtio_vdpa_finalize_features(struct virtio_device *vdev)

include/linux/vdpa.h

@@ -171,14 +171,17 @@ struct vdpa_map_file {
  *				for the device
  *				@vdev: vdpa device
  *				Returns virtqueue algin requirement
- * @get_features:		Get virtio features supported by the device
+ * @get_device_features:	Get virtio features supported by the device
  *				@vdev: vdpa device
  *				Returns the virtio features support by the
  *				device
- * @set_features:		Set virtio features supported by the driver
+ * @set_driver_features:	Set virtio features supported by the driver
  *				@vdev: vdpa device
  *				@features: feature support by the driver
  *				Returns integer: success (0) or error (< 0)
+ * @get_driver_features:	Get the virtio driver features in action
+ *				@vdev: vdpa device
+ *				Returns the virtio features accepted
  * @set_config_cb:		Set the config interrupt callback
  *				@vdev: vdpa device
  *				@cb: virtio-vdev interrupt callback structure
@@ -278,8 +281,9 @@ struct vdpa_config_ops {
 
 	/* Device ops */
 	u32 (*get_vq_align)(struct vdpa_device *vdev);
-	u64 (*get_features)(struct vdpa_device *vdev);
-	int (*set_features)(struct vdpa_device *vdev, u64 features);
+	u64 (*get_device_features)(struct vdpa_device *vdev);
+	int (*set_driver_features)(struct vdpa_device *vdev, u64 features);
+	u64 (*get_driver_features)(struct vdpa_device *vdev);
 	void (*set_config_cb)(struct vdpa_device *vdev,
 			      struct vdpa_callback *cb);
 	u16 (*get_vq_num_max)(struct vdpa_device *vdev);
@@ -397,7 +401,7 @@ static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
 	const struct vdpa_config_ops *ops = vdev->config;
 
 	vdev->features_valid = true;
-	return ops->set_features(vdev, features);
+	return ops->set_driver_features(vdev, features);
 }
 
 void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,