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alc.4freebsd

BSD mandoc

NAME

alc - Atheros AR8131/AR8132 Gigabit/Fast Ethernet driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device miibus device alc

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

 if_alc_load="YES"
 

DESCRIPTION

The device driver provides support for Atheros AR8131 PCI Express Gigabit Ethernet controllers and Atheros AR8132 PCI Express Fast Ethernet controllers.

All LOMs supported by the driver have TCP/UDP/IP checksum offload for transmit, TCP segmentation offload (TSO), hardware VLAN tag stripping/insertion features, Wake On Lan (WOL) and an interrupt moderation mechanism as well as a 64-bit multicast hash filter.

The AR8131/AR8132 supports Jumbo Frames (up to 9216 bytes), which can be configured 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 driver supports the following media types:

autoselect

Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to rc.conf5.

10baseT/UTP

Set 10Mbps operation.

100baseTX

Set 100Mbps (Fast Ethernet) operation.

1000baseTX

Set 1000baseTX operation over twisted pair.

The driver supports the following media options:

full-duplex

Force full duplex operation.

half-duplex

Force half duplex operation.

For more information on configuring this device, see ifconfig(8).

HARDWARE

The device driver provides support for the following Ethernet controllers:

• Atheros AR8131 PCI Express Gigabit Ethernet controller
• Atheros AR8132 PCI Express Fast Ethernet controller

LOADER TUNABLES

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf5.

hw.alc.msi_disable

This tunable disables MSI support on the Ethernet hardware. The default value is 0.

hw.alc.msix_disable

This tunable disables MSI-X support on the Ethernet hardware. The default value is 0.

SYSCTL VARIABLES

The following variables are available as both sysctl(8) variables and loader(8) tunables:

dev.alc.%d.int_rx_mod

Maximum amount of time to delay receive interrupt processing in units of 1us. The accepted range is 0 to 130000, the default is 100(100us). Value 0 completely disables the interrupt moderation.

dev.alc.%d.int_tx_mod

Maximum amount of time to delay transmit interrupt processing in units of 1us. The accepted range is 0 to 130000, the default is 50000(50ms). Value 0 completely disables the interrupt moderation.

dev.alc.%d.process_limit

Maximum amount of Rx frames to be processed in the event loop before rescheduling a taskqueue. The accepted range is 32 to 255, the default value is 64 events. The interface does not need to be brought down and up again before a change takes effect.

SEE ALSO

altq(4), arp(4), miibus(4), netintro(4), ng_ether4, vlan(4), ifconfig(8)

HISTORY

The driver was written by An Pyun YongHyeon Aq yongari@FreeBSD.org . It first appeared in Fx 8.0 .