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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 and 82576 Ethernet controller chips.  The driver
     supports Transmit/Receive checksum offload and Jumbo Frames.  Furthermore
     it supports TCP segmentation offload (TSO) on all adapters.

     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)

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 256.  The minimum is 80, and the maximum is
             4096.

     hw.igb.txd
             Number of transmit descriptors allocated by the driver.  The
             default value is 256.  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.

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 〈freebsdnic@mailbox.intel.com〉.

SEE ALSO

     altq(4), arp(4), em(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
     〈freebsdnic@mailbox.intel.com〉.