dmfe(7D)							      Devices								  dmfe(7D)

NAME

       dmfe - Davicom Fast Ethernet driver for Davicom DM9102A

SYNOPSIS

       /platform/sun4u/kernel/drv/sparcv9/dmfe

DESCRIPTION

       The  dmfe  Ethernet  device  provides  100Base-TX networking interfaces using the Davicom DM9102A chip, which incorporates its own internal
       transceiver.

       The dmfe driver is a multithreaded, loadable, clonable, GLD-based STREAMS driver. Multiple controllers	   installed within the system are
       supported by the driver. The dmfe driver functions include controller initialization, frame transmit and receive, promiscuous and multicast
       support, and error recovery and reporting.

       The 100Base-TX standard specifies an auto-negotiation protocol to automatically select the mode and speed of operation. The internal trans-
       ceiver  is capable of performing autonegotiation with the remote-end of the link (link partner) and receives the capabilities of the remote
       end. It selects the highest common denominator mode of operation based on     the priorities. The  internal  transceiver  also  supports  a
       forced-mode of operation under which the driver selects the operational mode.

APPLICATION PROGRAMMING INTERFACE

       The /dev/dmfe cloning character-special device is used to access all Davicom DM9102A devices installed in the system.

       The  dmfe  driver  is dependent on /kernel/misc/gld, a loadable kernel module that provides the dmfe driver with the DLPI and STREAMS func-
       tionality required of a LAN driver. See gld(7D) for more details on the primitives supported by the driver.

       You must send an explicit DL_ATTACH_REQ message to associate the opened stream with a particular device (ppa). The ppa ID is interpreted as
       an unsigned integer data type and indicates the corresponding device  instance (unit) number. If the ppa field value does not correspond to
       a valid device instance number for this system, an error (DL_ERROR_ACK) is returned. The device is initialized on first attach and  de-ini-
       tialized (stopped) at last detach.

       The values returned by the driver in the DL_INFO_ACK primitive in response to a DL_INFO_REQ are as follows:

	 o  Maximum  SDU  is  1500  (ETHERMTU - defined  in sys/ethernet.h).

	 o  Minimum SDU is 0.

	 o  DLSAP address length is 8.

	 o  MAC type is DL_ETHER.

	 o  The  sap  length  value   is  -2,  meaning the physical address component is followed immediately by a 2-byte sap component within the
	    DLSAP address.

	 o  The broadcast address value is  the Ethernet/IEEE broadcast address (FF:FF:FF:FF:FF:FF).

       Once  in  the  DL_ATTACHED  state, you must send  a DL_BIND_REQ to  associate a particular Service Access Point (SAP) with the stream.

CONFIGURATION

       By default, the dmfe driver performs auto-negotiation to select the speed and mode of the link. Link speed and mode can be 100  Mbps  (full
       or half-duplex) or 10 Mbps (full or half-duplex) as described in the 100Base-TX standard.

       The auto-negotiation protocol automatically selects speed mode (either 100 Mbps or 10 Mbps) and operation mode (either full-duplex or half-
       duplex) as the highest common denominator supported by both link partners. Because the dmfe device supports  all  modes,  this  effectively
       selects the highest-throughput mode supported by the other device.

       Alternatively, you can explicitly specify the link parameters by adding entries to the dmfe driver configuration file (/platform/sun4u/ker-
       nel/drv/dmfe.conf). You can set the speed parameter to 10 or 100 to force dmfe devices to operate at the specified speed. Additionally, you
       can set the full-duplex parameter to 0 or 1 to disable or force full-duplex operation, respectively.

       Note  that specifying either "speed" or "full-duplex" explicitly disables auto-negotiation. To enable the driver to determine the appropri-
       ate setting for each parameter, you should always set both parameters. If it is necessary to force either  speed  or  duplex  setting  (for
       example,  because the  dmfe device is connected to an ancient device or hub that does not support auto-negotiation), both parameters should
       be explicitly specified to match the requirements of the external device.

FILES

       /dev/dmfe

	   Character special device

       /platform/sun4u/kernel/drv/dmfe.conf

	   dmfe configuration file

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |x86			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), gld(7D), dlpi(7P), streamio(7I)

       Writing Device Drivers

       STREAMS Programming Guide

       Network Interfaces Programmer's Guide

SunOS 5.10							   23 July 2003 							  dmfe(7D)