def _subn_do(self,payload,path,attributeModifier,method):
if isinstance(path,rdma.path.IBDRPath):
fmt = IBA.SMPFormatDirected();
fmt.drSLID = path.drSLID;
fmt.drDLID = path.drDLID;
fmt.initialPath[:len(path.drPath)] = path.drPath;
fmt.hopCount = len(path.drPath)-1;
else:
fmt = IBA.SMPFormat();
fmt.MKey = getattr(path,"MKey",0);
return self._doMAD(fmt,payload,path,attributeModifier,method);
