IB/rdmavt: Move driver helper functions to a common structure

Drivers are going to need to provide multiple functions for rdmavt to
call in to. We already have one, so go ahead and push this into a
data structure designated for driver supplied functions.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rdmavt/vt.c

@@ -280,8 +280,12 @@ int rvt_register_device(struct rvt_dev_info *rdi)
 	spin_lock_init(&rdi->n_pds_lock);
 	rdi->n_pds_allocated = 0;
 
+	/* Validate that drivers have provided the right functions */
+	if (!rdi->driver_f.port_callback)
+		return -EINVAL;
+
 	/* We are now good to announce we exist */
-	return ib_register_device(&rdi->ibdev, rdi->port_callback);
+	return ib_register_device(&rdi->ibdev, rdi->driver_f.port_callback);
 }
 EXPORT_SYMBOL(rvt_register_device);
 

include/rdma/rdma_vt.h

@@ -383,6 +383,19 @@ struct rvt_driver_params {
 	 */
 };
 
+/*
+ * Functions that drivers are required to support
+ */
+struct rvt_driver_provided {
+	/*
+	 * The work to create port files in /sys/class Infiniband is different
+	 * depending on the driver. This should not be extracted away and
+	 * instead drivers are responsible for setting the correct callback for
+	 * this.
+	 */
+	int (*port_callback)(struct ib_device *, u8, struct kobject *);
+};
+
 /* Protection domain */
 struct rvt_pd {
 	struct ib_pd ibpd;
@@ -407,13 +420,8 @@ struct rvt_dev_info {
 
 	/* PKey Table goes here */
 
-	/*
-	 * The work to create port files in /sys/class Infiniband is different
-	 * depending on the driver. This should not be extracted away and
-	 * instead drivers are responsible for setting the correct callback for
-	 * this.
-	 */
-	int (*port_callback)(struct ib_device *, u8, struct kobject *);
+	/* Driver specific helper functions */
+	struct rvt_driver_provided driver_f;
 
 	/* Internal use */
 	int n_pds_allocated;