'\" te
.\"  All Rights Reserved.  Copyright (c) 2000, Sun Microsystems, Inc.  All Rights Reserved
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.TH dnet 7D "20 OCT 2000" "SunOS 5.11" "Devices"
.SH NAME
dnet \- Ethernet driver for DEC 21040, 21041, 21140 Ethernet cards
.SH SYNOPSIS
.LP
.nf
\fB/kernel/drv/dnet\fR 
.fi

.SH DESCRIPTION
.sp
.LP
The \fBdnet\fR Ethernet driver is a multithreaded, loadable, clonable,
\fBSTREAMS GLD\fR driver. Multiple controllers installed within the system are
supported by the driver. The \fBdnet\fR driver functions include controller
initialization, frame transmit and receive, functional addresses, promiscuous
and multicast support, and error recovery and reporting.
.SH APPLICATION PROGRAMMING INTERFACE
.sp
.LP
The cloning character-special device, \fB/dev/dnet\fR, is used to access all
DEC 21040/21041/21140 devices installed in the system.
.sp
.LP
The \fBdnet\fR driver is dependent on \fB/kernel/misc/gld\fR, a loadable kernel
module that provides the \fBdnet\fR driver with the \fBDLPI\fR and
\fBSTREAMS\fR functionality required of a \fBLAN\fR driver.  See \fBgld\fR(7D)
for more details on the primitives supported by the driver.
.sp
.LP
The device is initialized on the first attach and de-initialized (stopped) on
the last detach.
.sp
.LP
The values returned by the driver in the \fBDL_INFO_ACK\fR primitive in
response to a \fBDL_INFO_REQ\fR from the user are as follows:
.RS +4
.TP
.ie t \(bu
.el o
The maximum \fBSDU\fR is \fB1500\fR (\fBETHERMTU\fR - defined in
<\fBsys/ethernet.h\fR>).
.RE
.RS +4
.TP
.ie t \(bu
.el o
The minimum \fBSDU\fR is \fB0\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The \fBDLSAP\fR address length is \fB8\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The \fBMAC\fR type is \fBDL_ETHER\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The \fBsap\fR length value is \fB\(mi2\fR, meaning the physical address
component is followed immediately by a 2-byte \fBsap\fR component within the
\fBDLSAP\fR address.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The broadcast address value is the Ethernet/IEEE broadcast address
(\fBFF:FF:FF:FF:FF:FF\fR).
.RE
.sp
.LP
Once in the \fBDL_ATTACHED\fR state, the user must send a \fBDL_BIND_REQ\fR to
associate a particular Service Access Point (SAP) with the stream.
.SH PRECONFIGURATION
.sp
.LP
The PCI configuration process varies from system to system. Follow the
instructions provided by the vendor.
.SS "Known Problems and Limitations"
.RS +4
.TP
.ie t \(bu
.el 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.)
.RE
.RS +4
.TP
.ie t \(bu
.el o
If the  \fBdnet\fR 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 \fBdnet.conf\fR file.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The \fBdnet\fR 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.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Version 4 SROM formats are not supported.
.RE
.SH CONFIGURATION
.sp
.LP
The \fB/kernel/drv/dnet.conf\fR file supports the following options:
.sp
.ne 2
.mk
.na
\fB\fBfull-duplex\fR\fR
.ad
.RS 15n
.rt  
For full duplex operation use \fBfull-duplex=1\fR, for half duplex use
\fBfull-duplex=0\fR. Half-duplex operation gives better results on older 10mbit
networks.
.RE

.sp
.ne 2
.mk
.na
\fB\fBspeed\fR\fR
.ad
.RS 15n
.rt  
For 10mbit operation use \fBspeed=10\fR, for 100mbit operation use
\fBspeed=100\fR. Certain 21140 based cards will operate at either speed. Use
the speed property to override the 100mbit default in this case.
.RE

.SH FILES
.sp
.ne 2
.mk
.na
\fB\fB/dev/dnet\fR\fR
.ad
.RS 25n
.rt  
character special device
.RE

.sp
.ne 2
.mk
.na
\fB\fB/kernel/drv/dnet.conf\fR\fR
.ad
.RS 25n
.rt  
\fBdnet\fR configuration file
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Architecturex86
.TE

.SH SEE ALSO
.sp
.LP
\fBattributes\fR(5), \fBdlpi\fR(7P), \fBgld\fR(7D) \fBstreamio\fR(7I)
.sp
.LP
\fIWriting Device Drivers\fR
.sp
.LP
 \fISTREAMS Programming Guide\fR