.\" Copyright (c) 2001 Intel Corporation
.\" All rights reserved.
.\" Redistribution and use in source and binary forms of the Software, with or without 
.\" modification, are permitted provided that the following conditions 
.\" are met:
.\" 1. Redistributions of source code of the Software may retain the above 
.\" copyright notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form of the Software may reproduce the 
.\" above copyright notice, this list of conditions and the following 
.\" disclaimer in the documentation and/or other materials provided with the 
.\" distribution.
.\" 3. Neither the name of the Intel Corporation nor the names of its contributors 
.\" shall be used to endorse or promote products derived from this Software 
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR ITS CONTRIBUTORS BE LIABLE 
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
.\" USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $FreeBSD$
.Dd December, 2001
.Dt EM 4
.Os FreeBSD
.Sh NAME
.Nm em
.Nd
Intel(R) PRO/1000 gigabit Ethernet driver for the FreeBSD operating system
.Sh SYNOPSIS
.Cd "device em"
.Sh DESCRIPTION
The
.Nm
driver provides support for PCI gigabit Ethernet adapters based on
the Intel 82542, 82543 and 82544 Ethernet controller chip.
The driver supports Transmit/Receive checksum offload
and Jumbo Frames only on 82543 and 82544-based adapters.
For a list of supported adapters, see the README 
included with the driver.
.Pp
For questions related to hardware requirements, 
refer to the documentation supplied with your Intel PRO/1000 adapter. 
All hardware requirements listed apply to use with FreeBSD.
.Pp
Support for Jumbo Frames is provided via the interface MTU setting.
Selecting an MTU larger than 1500 bytes with the
.Xr ifconfig 8
utility configures the adapter to receive and transmit Jumbo Frames.
The maximum MTU size for Jumbo Frames is 16114.
.Pp
The
.Nm
driver supports the following media types:
.Pp
.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
.It autoselect
Enables auto-negotiation for speed and duplex.
.It 10baseT/UTP
Sets 10Mbps operation.
Use the
.Ar mediaopt
option to select
.Ar full-duplex
mode.
.It 100baseTX
Sets 100Mbps operation.
Use the
.Ar mediaopt
option to select
.Ar full-duplex
mode.
.It 1000baseSX
Sets 1000Mbps operation.
Only 
.Ar full-duplex
mode is supported at this speed.
.It 1000baseTX
Sets 1000Mbps operation.
Only 
.Ar full-duplex
mode is supported at this speed.
.El
.Pp
The
.Nm
driver supports the following media options:
.Pp
.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
.It full-duplex
Forces full-duplex operation
.It half-duplex
Forces half-duplex operation.
.El
.Pp
Only use mediaopt to set the driver to full-duplex. If mediaopt is not specified, the driver defaults to half-duplex.
.Pp
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh DIAGNOSTICS
.Bl -diag
.It "em%d: Unable to allocate bus resource: memory"
A fatal initialization error has occurred.
.It "em%d: Unable to allocate bus resource: interrupt"
A fatal initialization error has occurred.
.It "em%d: watchdog timeout -- resetting"
The device has stopped responding to the network, or there is a problem with
the network connection (cable).
.El
.Sh SUPPORT
For additional information regarding building and installation, 
see the README included with the driver. For general information and support, 
go to the Intel support website at:
.Ar http://support.intel.com.
.Pp
If an issue is identified with the released source code on the supported kernel 
with a supported adapter, email the specific information related to the 
issue to freebsdnic@mailbox.intel.com.
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr netintro 4 , 
.Xr vlan 4 ,
.Xr ng_ether 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 4.4 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Intel Corporation Aq freebsdnic@mailbox.intel.com .