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elxl(7D)			    Devices			      elxl(7D)

NAME
       elxl - 3Com Ethernet device driver

SYNOPSIS
       /kernel/drv/elxl

DESCRIPTION
       The  elxl driver currently supports the following network cards: Ether‐
       Link XL (3C900-TPO, 3C900-COMBO, 3C900B-TPO, 3C900B-COMBO, and  3C900B-
       TPC),  EtherLink	 XL  10/100  (3C905-TX	Fast, 3C905-T4 Fast, 3C905B-TX
       Fast, 3C905B-T4 Fast,  and  3C905C-TX-M	Fast),	and  EtherLink	Server
       10/100 (3C980-TX Fast and 3C980C-TXM).

       The  elxl  Ethernet  driver  is	a  multi-threaded, loadable, clonable,
       STREAMS	hardware  driver  supporting  the  connectionless  Data	  Link
       Provider	  Interface,  dlpi(7P).	  Multiple  EtherLink  XL  controllers
       installed within the system are	supported  by  the  driver.  The  elxl
       driver  provides	 basic	support	 for the EtherLink hardware. Functions
       include chip initialization, frame transmit and	receive, multicast and
       promiscuous mode support, and error recovery and reporting.

       The  cloning,  character-special device /dev/elxl is used to access all
       EtherLink devices installed within the system.

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

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

	 ·  Maximum SDU is 1500 (ETHERMTU).

	 ·  Minimum SDU is 0. The driver will pad to  the  mandatory  60-octet
	    minimum packet size.

	 ·  The dlsap address length is 8.

	 ·  MAC type is DL_ETHER.

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

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

PRECONFIGURE
   Supported Settings
	 ·  Media Type: Auto Select

   Known Problems and Limitations
	 ·  3C905B cards in a Compaq ProLiant 6500 can fail to generate inter‐
	    rupts.  There  is  no  known workaround for this problem. However,
	    because some slots appear to be more prone	to  the	 problem  than
	    others,  try  correcting the problem by moving the card to another
	    PCI slot. If that fails, try rebooting the	machine	 a  number  of
	    times to free the card from the wedged state.

	 ·  Early  versions  of	 the  3Com 3C905C-TX-M adapter firmware do not
	    support PXE network boot on Solaris systems. If you	 are  using  a
	    version  earlier  than 4.11, upgrade the firmware. The PXE version
	    is indicated by the Managed Boot Agent version number. This number
	    is	not  normally  displayed  during boot, but is shown on the PXE
	    configuration screen.

CONFIGURATION
       The /kernel/drv/elxl.conf file supports the following  tunable  proper‐
       ties that you can set in the  elxl.conf file:

       tx_start_thresh

	   Minimum    number   of   bytes   in	 transmit   FIFO   (if	 lower
	   then the packet size), before NIC starts the	 frame	transfer.  The
	   higher the value, the less chance for a transmission underrun error
	   that triggers a transmission retry. Default value is	 250,  maximum
	   value is 1514.

       recv-descriptors

	   The	number of frames the device may receive from the network with‐
	   out system attention before the device begins dropping the  frames.
	   Valid range is 1 to 256. Default is 24.

       xmit-descriptors

	   The	 number	  of   outgoing	 frames	 that  the  system  can	 queue
	   on the driver queue before blocking a send request. Valid range  is
	   1 to 512. Default is 128.

       min-recv-data-buffers

	   Minimal    number	of    allocated	   receive    data    buffers.
	   Must be equal or greater than effective number of recv-descriptors.
	   Default (max value) is 128.

       max-recv-data-buffers

	   Maximum    number	of    allocated	   receive    data    buffers.
	   Must be equal or greater then min-recv-data-buffers number.

       inter-frame-space

	   Amount  of  time  in	  addition   to	  the	standard   inter-frame
	   time	 used  by IEEE 802.3 deference rule. Expressed in 32 multiples
	   of bit time. Used only in half-duplex context. This small IFS is to
	   make	 the defer-after-transmit time slightly longer than the defer-
	   after-receive time. This greatly reduces the	 high  collision  rate
	   seen with heavy TCP traffic (almost exactly one collision per ACK),
	   giving slightly improved overall throughput	in  half-duplex	 mode.
	   Default IFS is 32. This property is ignored in full-duplex mode.

       full-duplex

	   When	 set, it forces full-duplex mode for NIC capable of working in
	   full-duplex mode. If this property  is  set,	 the  auto-negotiation
	   feature  (if	 supported) of the network controller is disabled. For
	   full duplex operation use full-duplex=1. For half duplex use	 full-
	   duplex=0.  Half-duplex  operation  provides better results on older
	   10-Mbit networks.

       speed

	   Link speed in Mbps. Valid values are 10 and 100. If	this  property
	   is set, the auto-negotiation feature of the network controller  (if
	   supported) is disabled.

FILES
       /dev/elxl		       Special character device

       /kernel/drv/elxl.conf	       Configuration file for elxl driver

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

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       │Architecture		     │x86			   │
       └─────────────────────────────┴─────────────────────────────┘

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

SunOS 5.10			16 October 2003			      elxl(7D)
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