.\"-
.\" Copyright 2021 Intel Corp
.\" Copyright 2021 Rubicon Communications, LLC (Netgate)
.\" SPDX-License-Identifier: BSD-3-Clause
.\"
.Dd January 9, 2023
.Dt IGC 4
.Os
.Sh NAME
.Nm igc
.Nd "Intel Ethernet Controller I225 driver"
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device iflib"
.Cd "device igc"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
if_igc_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for any PCI Express adapter or LOM (LAN
On Motherboard) based on the Intel I225 Multi Gigabit Controller.
The driver supports Transmit/Receive checksum offload, Jumbo Frames,
MSI/MSI-X, TSO, and RSS.
.Pp
Support for Jumbo Frames is provided via the interface MTU setting.
Selecting an MTU larger than 1500 bytes with the
.Xr ifconfig 8
utility
configures the adapter to receive and transmit Jumbo Frames.
The maximum MTU size for Jumbo Frames is 9216 bytes.
.Pp
This driver version supports VLAN hardware insertion / extraction, and
VLAN checksum offload.
For information on enabling VLANs, see
.Xr ifconfig 8 .
The
.Nm
driver supports the following media types:
.Bl -tag -width ".Cm 10baseT/UTP"
.It Cm autoselect
Enables auto-negotiation for speed and duplex.
.It Cm 10baseT/UTP
Sets 10Mbps operation.
Use the
.Cm mediaopt
option to select
.Cm half-duplex
mode.
.It Cm 100baseTX
Sets 100Mbps operation.
Use the
.Cm mediaopt
option to select
.Cm half-duplex
mode.
.It Cm 1000baseT
Sets 1000Mbps operation.
Only
.Cm full-duplex
mode is supported at this speed.
.It Cm 2500baseT
Sets 2500Mbps operation.
Only
.Cm full-duplex
mode is supported at this speed.
.El
.Sh HARDWARE
The
.Nm
driver supports the following models:
.Pp
.Bl -bullet -compact
.It
I225-LM
.It
I225-V
.It
I225-IT
.It
I225-K
.El
.Sh LOADER TUNABLES
Tunables can be set at the
.Xr loader 8
prompt before booting the kernel or stored in
.Xr loader.conf 5 .
.Bl -tag -width indent
.It Va hw.igc.igc_disable_crc_stripping
Disable or enable hardware stripping of CRC field.
This is mostly useful on BMC/IPMI shared interfaces where stripping the
CRC causes remote access over IPMI to fail.
Default 0 (enabled).
.It Va hw.igc.sbp
Show bad packets when in promiscuous mode.
Default is false.
.It Va hw.igc.eee_setting
Disable or enable Energy Efficient Ethernet.
Default 1 (disabled).
.It Va hw.igc.max_interrupt_rate
Maximum device interrupts per second.
The default is 8000.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "igc%d: Hardware Initialization Failed"
A fatal initialization error has occurred.
.It "igc%d: Unable to allocate bus resource: memory"
A fatal initialization error has occurred.
.It "igc%d: Invalid MAC address"
The MAC address programmed into the EEPROM is either empty or a multicast/broadcast
address.
.El
.Sh SEE ALSO
.Xr altq 4 ,
.Xr arp 4 ,
.Xr iflib 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr vlan 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 13.1 .
.Sh AUTHORS
.An -nosplit
The
.Nm
was originally written by
.An Intel Corporation
and converted to the
.Xr iflib 4
framework by
.An Netgate .