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DNET(7D)							      DNET(7D)

       dnet - Ethernet driver for DEC 21040, 21041, 21140 Ethernet cards


       The  dnet  Ethernet  driver  is	a  multithreaded,  loadable, clonable,
       STREAMS GLD driver. Multiple controllers installed  within  the	system
       are  supported  by  the	driver. The dnet driver functions include con‐
       troller	initialization,	 frame	transmit   and	 receive,   functional
       addresses,  promiscuous	and  multicast support, and error recovery and

       The cloning character-special device, /dev/dnet, is used to access  all
       DEC 21040/21041/21140 devices installed in the system.

       The  dnet  driver  is  dependent on /kernel/misc/gld, a loadable kernel
       module that provides the dnet 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.

       The device is  initialized  on  the  first  attach  and	de-initialized
       (stopped) on the last detach.

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

	   o	  The maximum SDU is 1500 (ETHERMTU - defined  in  <sys/ether‐

	   o	  The minimum SDU is 0.

	   o	  The DLSAP address length is 8.

	   o	  The 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, the user must send a DL_BIND_REQ to  as‐
       sociate a particular Service Access Point (SAP) with the stream.

       The  PCI configuration process varies from system to system. Follow the
       instructions provided by the vendor.

   Known Problems and Limitations
	   o	  On multiport cards (exception: Osicom	 (Rockwell)  RNS2340),
		  the  first port is the top port. (On the Osicom RNS2340, the
		  first port is the bottom port.)

	   o	  If the  dnet driver fails to determine the correct speed and
		  duplex  mode	resulting  in  a corresponding drop in perfor‐
		  mance, set the speed and duplex  mode	 using	the  dnet.conf

	   o	  The  dnet  driver incorrectly counts carrier lost or no car‐
		  rier errors while in full-duplex mode. There is  no  carrier
		  signal present when in full-duplex mode and it should not be
		  counted as an error.

	   o	  Version 4 SROM formats are not supported.

       The /kernel/drv/dnet.conf file supports the following options:

		      For full duplex operation use  full-duplex=1,  for  half
		      duplex  use  full-duplex=0.  Half-duplex operation gives
		      better results on older 10mbit networks.

		      For 10mbit operation use speed=10, for 100mbit operation
		      use speed=100. Certain 21140 based cards will operate at
		      either speed. Use the speed  property  to	 override  the
		      100mbit default in this case.

				character special device

				dnet configuration file

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

       │Architecture   │ x86		 │

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

       Writing Device Drivers

	STREAMS Programming Guide

				 Oct 20, 2000			      DNET(7D)

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