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EM(4)		       FreeBSD Kernel Interfaces Manual			 EM(4)

NAME
     em	-- Intel(R) PRO/1000 Gigabit Ethernet adapter driver

SYNOPSIS
     device em

DESCRIPTION
     The em driver provides support for	PCI Gigabit Ethernet adapters based on
     the Intel 82540, 82541ER, 82541PI,	82542, 82543, 82544, 82545, 82546,
     82546EB, 82546GB and 82547	Ethernet controller chips.  The	driver sup-
     ports Transmit/Receive checksum offload and Jumbo Frames only on 82540,
     82543, 82544 and 82546-based adapters.  For further hardware information,
     see the README included with the driver.

     For questions related to hardware requirements, refer to the documenta-
     tion supplied with	your Intel PRO/1000 adapter.  All hardware require-
     ments listed apply	to use with FreeBSD.

     Support for Jumbo Frames is provided via the interface MTU	setting.
     Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility con-
     figures the adapter to receive and	transmit Jumbo Frames.	The maximum
     MTU size for Jumbo	Frames is 16114.

     This driver version supports VLANs.  For information on enabling VLANs,
     see the README.  The em driver supports the following media types:

     autoselect	  Enables auto-negotiation for speed and duplex.

     10baseT/UTP  Sets 10Mbps operation.  Use the mediaopt option to select
		  full-duplex mode.

     100baseTX	  Sets 100Mbps operation.  Use the mediaopt option to select
		  full-duplex mode.

     1000baseSX	  Sets 1000Mbps	operation.  Only full-duplex mode is supported
		  at this speed.

     1000baseTX	  Sets 1000Mbps	operation.  Only full-duplex mode is supported
		  at this speed.

     The em driver supports the	following media	options:

     full-duplex  Forces full-duplex operation

     half-duplex  Forces half-duplex operation.

     Only use mediaopt to set the driver to full-duplex.  If mediaopt is not
     specified,	the driver defaults to half-duplex.

     For more information on configuring this device, see ifconfig(8).

HARDWARE
     The em driver supports Gigabit Ethernet adapters based on the Intel
     82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546, 82546EB,
     82546GB and 82547 controller chips:

     +o	 Intel PRO/1000	CT Network Connection (82547)
     +o	 Intel PRO/1000	F Server Adapter (82543)
     +o	 Intel PRO/1000	Gigabit	Server Adapter (82542)
     +o	 Intel PRO/1000	GT Desktop Adapter (82541PI)
     +o	 Intel PRO/1000	MF Dual	Port Server Adapter (82546)
     +o	 Intel PRO/1000	MF Server Adapter (82545)
     +o	 Intel PRO/1000	MF Server Adapter (LX) (82545)
     +o	 Intel PRO/1000	MT Desktop Adapter (82540)
     +o	 Intel PRO/1000	MT Desktop Adapter (82541)
     +o	 Intel PRO/1000	MT Dual	Port Server Adapter (82546)
     +o	 Intel PRO/1000	MT Quad	Port Server Adapter (82546EB)
     +o	 Intel PRO/1000	MT Server Adapter (82545)
     +o	 Intel PRO/1000	T Desktop Adapter (82544)
     +o	 Intel PRO/1000	T Server Adapter (82543)
     +o	 Intel PRO/1000	XF Server Adapter (82544)
     +o	 Intel PRO/1000	XT Server Adapter (82544)

DIAGNOSTICS
     em%d: Unable to allocate bus resource: memory  A fatal initialization
     error has occurred.

     em%d: Unable to allocate bus resource: interrupt  A fatal initialization
     error has occurred.

     em%d: watchdog timeout -- resetting  The device has stopped responding to
     the network, or there is a	problem	with the network connection (cable).

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: http://support.intel.com.

     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>.

SEE ALSO
     arp(4), gx(4), netintro(4), ng_ether(4), polling(4), vlan(4), ifconfig(8)

HISTORY
     The em device driver first	appeared in FreeBSD 4.4.

AUTHORS
     The em driver was written by Intel	Corporation
     <freebsdnic@mailbox.intel.com>.

BUGS
     Hardware-assisted VLAN processing is disabled by default.	You can	enable
     it	on an em interface using ifconfig(8) unless you	are going to run
     bridge(4) on the interface.  In any case, VLAN can	operate	safely without
     the hardware acceleration.

FreeBSD	9.3		       January 30, 2005			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SUPPORT | SEE ALSO | HISTORY | AUTHORS | BUGS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=em&sektion=4&manpath=FreeBSD+5.5-RELEASE>

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