xref: /freebsd/share/man/man4/em.4 (revision 802a4af8e8ae002d6608e1cf7c4801ac35dc3959)

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.\" $FreeBSD$
.\"
.Dd December 8, 2001
.Dt EM 4
.Os
.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
.Pa 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
.Fx .
.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:
.Bl -tag -width ".Cm 10baseT/UTP"
.It Cm autoselect
Enables auto-negotiation for speed and duplex.
.It Cm 10baseT/UTP
Sets 10Mbps operation.
Use the
.Cm mediaopt
option to select
.Cm full-duplex
mode.
.It Cm 100baseTX
Sets 100Mbps operation.
Use the
.Cm mediaopt
option to select
.Cm full-duplex
mode.
.It Cm 1000baseSX
Sets 1000Mbps operation.
Only
.Cm full-duplex
mode is supported at this speed.
.It Cm 1000baseTX
Sets 1000Mbps operation.
Only
.Cm full-duplex
mode is supported at this speed.
.El
.Pp
The
.Nm
driver supports the following media options:
.Bl -tag -width ".Cm full-duplex"
.It Cm full-duplex
Forces full-duplex operation
.It Cm half-duplex
Forces half-duplex operation.
.El
.Pp
Only use
.Cm mediaopt
to set the driver to
.Cm full-duplex .
If
.Cm mediaopt
is not specified, the driver defaults to
.Cm 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
.Pa README
included with the driver.
For general information and support,
go to the Intel support website at:
.Pa 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
.Aq freebsdnic@mailbox.intel.com .
.Sh SEE ALSO
.Xr arp 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr vlan 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 .