NAME

       alc — Atheros AR813x/AR815x/AR816x/AR817x 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.conf(5):

             if_alc_load="YES"

DESCRIPTION

       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).

HARDWARE

       The alc device driver provides support for the following Ethernet controllers:

       •   Atheros AR8131 PCI Express Gigabit Ethernet controller
       •   Atheros AR8132 PCI Express Fast Ethernet controller
       •   Atheros AR8151 v1.0 PCI Express Gigabit Ethernet controller
       •   Atheros AR8151 v2.0 PCI Express Gigabit Ethernet controller
       •   Atheros AR8152 v1.1 PCI Express Fast Ethernet controller
       •   Atheros AR8152 v2.0 PCI Express Fast Ethernet controller
       •   Atheros AR8161 PCI Express Gigabit Ethernet controller
       •   Atheros AR8162 PCI Express Fast Ethernet controller
       •   Atheros AR8171 PCI Express Gigabit Ethernet controller
       •   Atheros AR8172 PCI Express Fast Ethernet controller
       •   Killer E2200 Gigabit Ethernet controller
       •   Killer E2400 Gigabit Ethernet controller
       •   Killer E2500 Gigabit Ethernet controller

LOADER TUNABLES

       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.

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  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.

SEE ALSO

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

HISTORY

       The alc driver was written by Pyun YongHyeon <yongari@FreeBSD.org>.  It first appeared in FreeBSD 8.0.

Debian                                           August 22, 2016                                          ALC(4)