if_ae man page on FreeBSD

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AE(4)			 BSD Kernel Interfaces Manual			 AE(4)

NAME
     ae — Attansic/Atheros L2 FastEthernet controller driver

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

	   device miibus
	   device ae

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

	    if_ae_load="YES"

DESCRIPTION
     The ae device driver provides support for Attansic/Atheros L2 PCIe
     FastEthernet controllers.

     The controller supports hardware Ethernet checksum processing, hardware
     VLAN tag stripping/insertion and an interrupt moderation mechanism.
     Attansic L2 also features a 64-bit multicast hash filter.

     The ae 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  Select 10Mbps operation.

     100baseTX	  Set 100Mbps (FastEthernet) operation.

     The ae driver provides support for 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 ae driver supports Attansic/Atheros L2 PCIe FastEthernet controllers,
     and is known to support the following hardware:

     ·	 ASUS EeePC 701
     ·	 ASUS EeePC 900

     Other hardware may or may not work with this driver.

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

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

SYSCTL VARIABLES
     The ae driver collects a number of useful MAC counter during the work.
     The statistics is available via the dev.ae.%d.stats sysctl(8) tree, where
     %d corresponds to the controller number.

DIAGNOSTICS
     ae%d: watchdog timeout.  The device has stopped responding to the net‐
     work, or there is a problem with the network connection (cable).

     ae%d: reset timeout.  The card reset operation has been timed out.

     ae%d: Generating random ethernet address.	No valid Ethernet address was
     found in the controller NVRAM and registers.  Random locally administered
     address with ASUS OUI identifier will be used instead.

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

BUGS
     The Attansic L2 FastEthernet contoller supports DMA but does not use a
     descriptor based transfer mechanism via scatter-gather DMA.  Thus the
     data should be copied to/from the controller memory on each trans‐
     mit/receive.  Furthermore, a lot of data alignment restrictions apply.
     This may introduce a high CPU load on systems with heavy network activ‐
     ity.  Luckily enough this should not be a problem on modern hardware as
     L2 does not support speeds faster than 100Mbps.

HISTORY
     The ae driver and this manual page was written by Stanislav Sedov
     ⟨stas@FreeBSD.org⟩.  It first appeared in FreeBSD 7.1.

BSD				October 4, 2008				   BSD
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