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vdpa: Provide interface to read driver features

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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.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eli Cohen
2022-01-05 13:46:33 +02:00
committed by Michael S. Tsirkin
parent 870aaff92e
commit a64917bc2e
10 changed files with 87 additions and 34 deletions
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14
include/linux/vdpa.h
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@@ -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,