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NAME
igb — Intel(R) PRO/1000 PCI Express Gigabit Ethernet adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device igb
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_igb_load="YES"
DESCRIPTION
The igb driver provides support for PCI Express Gigabit Ethernet adapters based on the Intel 82575, 82576,
82580, i21x and i35x Ethernet controller chips. The driver supports Transmit/Receive checksum offload and
Jumbo Frames. Furthermore it supports TCP segmentation offload (TSO) on all adapters. The identification
LEDs of the adapters supported by the igb driver can be controlled via the led(4) API for localization
purposes.
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 9216.
This driver supports hardware assisted VLANs. The igb 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 igb 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 igb driver supports Gigabit Ethernet adapters based on the Intel 82575 and 82576 controller chips:
• Intel Gigabit ET Dual Port Server Adapter (82576)
• Intel Gigabit VT Quad Port Server Adapter (82575)
• Intel Single, Dual and Quad Gigabit Ethernet Controller (82580)
• Intel i210 and i211 Gigabit Ethernet Controller
• Intel i350 and i354 Gigabit Ethernet Controller
LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.igb.rxd Number of receive descriptors allocated by the driver. The default value is 1024. The minimum is 80, and the maximum is 4096. hw.igb.txd Number of transmit descriptors allocated by the driver. The default value is 1024. The minimum is 80, and the maximum is 4096. hw.igb.enable_aim If set to 1, enable Adaptive Interrupt Moderation. The default is to enable Adaptive Interrupt Moderation. hw.igb.num_queues Number of queues used for data transfer. If set to 0, number of queues will be configured automatically based on number of CPUs and max supported MSI-X messages on the device. kern.ipc.nmbclusters The maximum number of mbuf clusters allowed. If the system has more than one igb card or jumbo frames are enabled, this value will need to be increased. kern.ipc.nmbjumbo9k The maximum number of mbuf 9k jumbo clusters allowed. Increasing this to allow for at least 8192 extra clusters per interface can allow for an mtu of 8192.
FILES
/dev/led/igb* identification LED device nodes
EXAMPLES
Make the identification LED of igb0 blink:
echo f2 > /dev/led/igb0
Turn the identification LED of igb0 off again:
echo 0 > /dev/led/igb0
DIAGNOSTICS
igb%d: Unable to allocate bus resource: memory A fatal initialization error has occurred.
igb%d: Unable to allocate bus resource: interrupt A fatal initialization error has occurred.
igb%d: watchdog timeout -- resetting The device has stopped responding to the network, or there is a
problem with the network connection (cable).
SUPPORT
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 ⟨freebsd@intel.com⟩.
SEE ALSO
altq(4), arp(4), em(4), led(4), netintro(4), ng_ether(4), polling(4), vlan(4), ifconfig(8)
HISTORY
The igb device driver first appeared in FreeBSD 7.1.
AUTHORS
The igb driver was written by Intel Corporation <freebsd@intel.com>.