Devices dnet(7D)
NAME
dnet - Ethernet driver for DEC 21040, 21041, 21140 Ethernet
cards
SYNOPSIS
/kernel/drv/dnet
DESCRIPTION
The dnet Ethernet driver is a multithreaded, loadable, clon-
able, 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.
APLICATION PROGRAMING INTERFACE
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 functionality 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 DLINFOACK primi-
tive in response to a DLINFOREQ from the user are as fol-
lows:
o The maximum SDU is 1500 (ETHERMTU - defined in
).
o The minimum SDU is 0.
o The DLSAP address length is 8.
o The MAC type is DLETHER.
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/IE
broadcast address (F:F:F:F:F:F).
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Devices dnet(7D)
Once in the DLATACHED state, the user must send a
DLBINDREQ to associate a particular Service Access Point
(SAP) with the stream.
PRECONFIGURATION
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 performance, set the speed and duplex mode
using the dnet.conf file.
o The dnet driver incorrectly counts carrier lost or
no carrier 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.
CONFIGURATION
The /kernel/drv/dnet.conf file supports the following
options:
full-duplex 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.
speed 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.
FILES
/dev/dnet character special device
/kernel/drv/dnet.conf dnet configuration file
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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Devices dnet(7D)
ATRIBUTE TYPE ATRIBUTE VALUE
Architecture x86
SEE ALSO
attributes(5), dlpi(7P), gld(7D) streamio(7I)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.11 Last change: 20 OCT 2000 3
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