dnet - Ethernet driver for DEC 21040, 21041, 21140 Ethernet cards
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 controller
initialization, frame transmit and receive, functional addresses,
promiscuous and multicast support, and error recovery and reporting.
APPLICATION PROGRAMMING INTERFACE
The cloning character-special device, /dev/dnet
, is used to access all
DEC 21040/21041/21140 devices installed in the system.
driver is dependent on /kernel/misc/gld
, a loadable kernel
module that provides the dnet
driver with the DLPI
functionality required of a LAN
driver. See gld(4D)
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
response to a DL_INFO_REQ
from the user are as follows:
o The maximum SDU
- defined in
o The minimum SDU
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
within the DLSAP
o The broadcast address value is the Ethernet/IEEE broadcast
Once in the DL_ATTACHED
state, the user must send a DL_BIND_REQ
associate 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 performance,
set the speed and duplex mode using the dnet.conf
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.
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
. Certain 21140 based cards will operate at
either speed. Use the speed property to override the
100mbit default in this case.
character special device /kernel/drv/dnet.conf dnet
for descriptions of the following attributes:
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Architecture | x86 |
SEE ALSO attributes(7)
, gld(4D) streamio(4I) Writing Device Drivers STREAMS Programming Guide
October 20, 2000 DNET(4D)