NAME

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

SYNOPSIS

/dev/dnet

DESCRIPTION

The dnet Ethernet driver is a multi-threaded, loadable, clonable, STREAMS GLD driver. Multiple controllers installed within the system are supported by the driver. The dnet driver functions include controller initialization, frame transmit and receive, functional addresses, promiscuous and multicast support, and error recovery and reporting.

APPLICATION PROGRAMMING

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

INTERFACE

The dnet driver is dependent on /kernel/misc/gld, a loadable kernel module that provides the dnet driver with the DLPI and STREAMS functionality required of a LAN driver. See gld (7D)for more details on the primatives 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:

The maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>).

The minimum SDU is 0 .

The DLSAP address length is 8 .

The 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 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 associate a particular Service Access Point (SAP) with the stream.

CONFIGURATION

The /plaform/i86pc/kernel/drv/dnet.conf file supports the following options:

fulldup

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

mode

For 10mbit operation use mode=10, for 100mbit operation use mode=100. Certain 21140 based cards will operate at either

speed. Use the mode property to override the 100mbit default in this case.

FILES

/dev/dnet

character special device

/plaform/i86pc/kernel/drv/dnet.conf

dnet configuration file

ATTRIBUTES

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	x86

SEE ALSO

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

Writing Device Drivers

STREAMS Programming Guide

Network Interfaces Programmer's Guide