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This commit makes use of the building blocks previously added to implement cross-device rate nodes. A new 'supported_cross_device_rate_nodes' bool is added to devlink_ops which lets drivers advertise support for cross-device rate objects. If enabled and if there is a common shared devlink instance, then: - all rate objects will be stored in the top-most common nested instance and - rate objects can have parents from other devices sharing the same common instance. Storing rates in the common shared ancestor is safe, because it is reference counted by its nested devlink instances, so it's guaranteed to outlive them. Furthermore, the shared devlink infra guarantees a given nested devlink hierarchy is managed by the same driver. The parent devlink from info->ctx is not locked, so none of its mutable fields can be used. But parent setting only requires comparing devlink pointer comparisons. Additionally, since the shared devlink is locked, other rate operations cannot concurrently happen. Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com> Reviewed-by: Carolina Jubran <cjubran@nvidia.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> Link: https://patch.msgid.link/20260701073254.754518-8-tariqt@nvidia.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>