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IGC(4) Kernel Interfaces Manual IGC(4) NAME igc -- Intel Ethernet Controller I225 2.5GbE driver SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: device iflib device igc Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_igc_load="YES" DESCRIPTION The igc 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. Support for Jumbo Frames is provided via the interface MTU setting. Se- lecting an MTU larger than 1500 bytes with the ifconfig(8) utility config- ures the adapter to receive and transmit Jumbo Frames. The maximum MTU size for Jumbo Frames is 9216 bytes. This driver version supports VLAN hardware insertion / extraction, and VLAN checksum offload. For information on enabling VLANs, see ifconfig(8). The igc 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 half-duplex mode. 100baseTX Sets 100Mbps operation. Use the mediaopt option to select half-duplex mode. 1000baseT Sets 1000Mbps operation. Only full-duplex mode is supported at this speed. 2500baseT Sets 2500Mbps operation. Only full-duplex mode is supported at this speed. HARDWARE The igc driver supports the following 2.5Gb Ethernet controllers: * I220-V * I221-V * I225-LM * I225-LMvP(2) * I225-V * I225-IT, I225-IT(2) * I225-K, I225-K(2) * I226-LM * I226-LMvP * I226-V * I226-IT * I226-K LOADER TUNABLES Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). 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). hw.igc.sbp Show bad packets when in promiscuous mode. Default is false. hw.igc.eee_setting Disable or enable Energy Efficient Ethernet. Default 1 (disabled). hw.igc.max_interrupt_rate Maximum device interrupts per second. The default is 8000. DIAGNOSTICS igc%d: Hardware Initialization Failed A fatal initialization error has oc- curred. igc%d: Unable to allocate bus resource: memory A fatal initialization er- ror has occurred. igc%d: Invalid MAC address The MAC address programmed into the EEPROM is either empty or a multicast/broadcast address. SEE ALSO altq(4), arp(4), iflib(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8) HISTORY The igc device driver first appeared in FreeBSD 13.1. AUTHORS The igc was originally written by Intel Corporation and converted to the iflib(4) framework by Netgate. FreeBSD ports 15.1 March 9, 2026 IGC(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS
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