1 files changed, 23 insertions, 0 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index fc457f452f64..e2850a7ea276 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -84,7 +84,9 @@
  *      nvqs: the number of virtqueues to find
  *      vqs: on success, includes new virtqueues
  *      callbacks: array of callbacks, for each virtqueue
+ *              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
  *      Returns 0 on success or error status
  * @del_vqs: free virtqueues found by find_vqs().
  * @get_features: get the array of feature bits for this device.
@@ -98,6 +100,7 @@
  *      vdev: the virtio_device
  *      This returns a pointer to the bus name a la pci_name from which
  *      the caller can then copy.
+ * @set_vq_affinity: set the affinity for a virtqueue.
  */
 typedef void vq_callback_t(struct virtqueue *);
 struct virtio_config_ops {
@@ -116,6 +119,7 @@ struct virtio_config_ops {
         u32 (*get_features)(struct virtio_device *vdev);
         void (*finalize_features)(struct virtio_device *vdev);
         const char *(*bus_name)(struct virtio_device *vdev);
+        int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
 };
 
 /* If driver didn't advertise the feature, it will never appear. */
@@ -190,5 +194,24 @@ const char *virtio_bus_name(struct virtio_device *vdev)
         return vdev->config->bus_name(vdev);
 }
 
+/**
+ * virtqueue_set_affinity - setting affinity for a virtqueue
+ * @vq: the virtqueue
+ * @cpu: the cpu no.
+ *
+ * Pay attention the function are best-effort: the affinity hint may not be set
+ * due to config support, irq type and sharing.
+ *
+ */
+static inline
+int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
+{
+        struct virtio_device *vdev = vq->vdev;
+        if (vdev->config->set_vq_affinity)
+                return vdev->config->set_vq_affinity(vq, cpu);
+        return 0;
+}
+
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_VIRTIO_CONFIG_H */