IB/rdmavt: Add driver notification for new AH

Drivers may need to do some work once an address handle has been
created. Add a driver function for this purpose.
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NHarish Chegondi <harish.chegondi@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rdmavt/ah.c

@@ -83,8 +83,8 @@ int rvt_check_ah(struct ib_device *ibdev,
 		    !(ah_attr->ah_flags & IB_AH_GRH))
 			return -EINVAL;
 	}
-	if (rdi->driver_f.check_ah(ibdev, ah_attr))
-		return -EINVAL;
+	if (rdi->driver_f.check_ah)
+		return rdi->driver_f.check_ah(ibdev, ah_attr);
 	return 0;
 }
 EXPORT_SYMBOL(rvt_check_ah);
@@ -123,6 +123,9 @@ struct ib_ah *rvt_create_ah(struct ib_pd *pd,
 	ah->attr = *ah_attr;
 	atomic_set(&ah->refcount, 0);
 
+	if (dev->driver_f.notify_new_ah)
+		dev->driver_f.notify_new_ah(pd->device, ah_attr, ah);
+
 	return &ah->ibah;
 }
 

include/rdma/rdma_vt.h

@@ -467,9 +467,21 @@ struct rvt_driver_params {
 	int nports;
 };
 
-/*
- * Functions that drivers are required to support
- */
+/* Protection domain */
+struct rvt_pd {
+	struct ib_pd ibpd;
+	int user;               /* non-zero if created from user space */
+};
+
+/* Address handle */
+struct rvt_ah {
+	struct ib_ah ibah;
+	struct ib_ah_attr attr;
+	atomic_t refcount;
+	u8 vl;
+	u8 log_pmtu;
+};
+
 struct rvt_dev_info;
 struct rvt_driver_provided {
 	/*
@@ -478,23 +490,20 @@ struct rvt_driver_provided {
 	 * instead drivers are responsible for setting the correct callback for
 	 * this.
 	 */
+
+	/* -------------------*/
+	/* Required functions */
+	/* -------------------*/
 	int (*port_callback)(struct ib_device *, u8, struct kobject *);
 	const char * (*get_card_name)(struct rvt_dev_info *rdi);
 	struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
-	int (*check_ah)(struct ib_device *, struct ib_ah_attr *);
-};
 
-/* Protection domain */
-struct rvt_pd {
-	struct ib_pd ibpd;
-	int user;               /* non-zero if created from user space */
-};
-
-/* Address handle */
-struct rvt_ah {
-	struct ib_ah ibah;
-	struct ib_ah_attr attr;
-	atomic_t refcount;
+	/*--------------------*/
+	/* Optional functions */
+	/*--------------------*/
+	int (*check_ah)(struct ib_device *, struct ib_ah_attr *);
+	void (*notify_new_ah)(struct ib_device *, struct ib_ah_attr *,
+			      struct rvt_ah *);
 };
 
 struct rvt_dev_info {