if_alc(4) manual page

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.conf(5):

if_alc_load="YES"

The alc device driver provides support for Atheros AR813x, AR815x, AR816x and AR817x PCI Express Gigabit/Fast Ethernet controllers.

All LOMs supported by the alc 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 AR813x, AR815x, AR816x and AR817x supports Jumbo Frames (up to 9216, 6144, 9216 and 9216 bytes, respectively), 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 alc 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.conf(5).

10baseT/UTP

Set 10Mbps operation.

100baseTX Set 100Mbps (Fast Ethernet) operation.

1000baseTX Set 1000baseTX operation over twisted pair.

The alc 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).

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).

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.

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 1000(1ms). 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.

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

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Manual Pages — ALC

NAME

CONTENTS

SYNOPSIS

DESCRIPTION

HARDWARE

LOADER TUNABLES

SYSCTL VARIABLES

SEE ALSO

HISTORY

autoselect	Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to rc.conf(5).
10baseT/UTP
	Set 10Mbps operation.
100baseTX	Set 100Mbps (Fast Ethernet) operation.
1000baseTX	Set 1000baseTX operation over twisted pair.

full-duplex
	Force full duplex operation.
half-duplex
	Force half duplex operation.