NAME
em – Intel(R) PRO/1000 Gigabit Ethernet adapter driver
SYNOPSIS
To compile support for the
em driver into your kernel, place the following line in your kernel configuration file:
device em
Alternatively, to load the
em driver at boot time, place the following line in loader.conf(5):
if_em_load="YES"
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, 82547 and 82573 Ethernet controller chips. The driver supports 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 documentation supplied with your Intel PRO/1000 adapter. All hardware requirements 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 configures 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, 82547 and 82573 controller chips:
-
Intel PRO/1000 CT Network Connection (82547)
-
Intel PRO/1000 F Server Adapter (82543)
-
Intel PRO/1000 Gigabit Server Adapter (82542)
-
Intel PRO/1000 GT Desktop Adapter (82541PI)
-
Intel PRO/1000 MF Dual Port Server Adapter (82546)
-
Intel PRO/1000 MF Server Adapter (82545)
-
Intel PRO/1000 MF Server Adapter (LX) (82545)
-
Intel PRO/1000 MT Desktop Adapter (82540)
-
Intel PRO/1000 MT Desktop Adapter (82541)
-
Intel PRO/1000 MT Dual Port Server Adapter (82546)
-
Intel PRO/1000 MT Quad Port Server Adapter (82546EB)
-
Intel PRO/1000 MT Server Adapter (82545)
-
Intel PRO/1000 T Desktop Adapter (82544)
-
Intel PRO/1000 T Server Adapter (82543)
-
Intel PRO/1000 XF Server Adapter (82544)
-
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 ⟨[email protected]⟩.
SEE ALSO
arp(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 ⟨[email protected]⟩.
BUGS
Hardware-assisted VLAN processing is disabled by default. You can enable it on an em interface using ifconfig(8).