IB/rdmavt: Add query gid stub

The handler for query gid operates along the same lines as the query pkey
handler. The driver will take care to keep the guid table updated.
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

@@ -157,6 +157,27 @@ static int rvt_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
 	return 0;
 }
 
+/**
+ * rvt_query_gid - Return a gid from the table
+ * @ibdev: Verbs IB dev
+ * @port: Port number
+ * @index: = Index in table
+ * @gid: Gid to return
+ *
+ * Returns 0 on success
+ */
+static int rvt_query_gid(struct ib_device *ibdev, u8 port,
+			 int index, union ib_gid *gid)
+{
+	/*
+	 * Driver is responsible for updating the guid table. Which will be used
+	 * to craft the return value. This will work similar to how query_pkey()
+	 * is being done.
+	 */
+
+	return -EOPNOTSUPP;
+}
+
 /*
  * Check driver override. If driver passes a value use it, otherwise we use our
  * own value.
@@ -175,6 +196,7 @@ int rvt_register_device(struct rvt_dev_info *rdi)
 	CHECK_DRIVER_OVERRIDE(rdi, query_port);
 	CHECK_DRIVER_OVERRIDE(rdi, modify_port);
 	CHECK_DRIVER_OVERRIDE(rdi, query_pkey);
+	CHECK_DRIVER_OVERRIDE(rdi, query_gid);
 
 	/* DMA Operations */
 	rdi->ibdev.dma_ops =