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):
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. 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)
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⟩.