PATH
In addition to supporting the DLPI primitives listed above, the Open Transport CSMA/CD driver includes extensions to support Fast Path mode (described in Fast Path Mode ). This includes the handling of M_IOCTL messages with a type of DL_IOC_HDR_INFO and special handling of M_DATA messages. It also defines several special M_IOCTL messages that enable the reception of raw packets and inform the CSMA/CD driver what kind of framing the client expects.