152 lines
4.6 KiB
Groff
152 lines
4.6 KiB
Groff
.\" Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 17, 2019
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.Dt AE 4
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.Os
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.Sh NAME
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.Nm ae
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.Nd "Attansic/Atheros L2 FastEthernet controller driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel, place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device miibus"
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.Cd "device ae"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_ae_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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device driver provides support for Attansic/Atheros L2 PCIe FastEthernet
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controllers.
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.Pp
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The controller supports hardware Ethernet checksum processing, hardware
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VLAN tag stripping/insertion and an interrupt moderation mechanism.
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Attansic L2 also features a 64-bit multicast hash filter.
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.Pp
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The
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.Nm
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driver supports the following media types:
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.Bl -tag -width ".Cm 10baseT/UTP"
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.It Cm autoselect
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Enable autoselection of the media type and options.
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The user can manually override the autoselected mode by
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adding media options to
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.Xr rc.conf 5 .
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.It Cm 10baseT/UTP
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Select 10Mbps operation.
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.It Cm 100baseTX
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Set 100Mbps (FastEthernet) operation.
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.El
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.Pp
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The
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.Nm
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driver provides support for the following media options:
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.Bl -tag -width ".Cm full-duplex"
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.It Cm full-duplex
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Force full duplex operation.
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.It Cm half-duplex
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Force half duplex operation.
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.El
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.Pp
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Sh HARDWARE
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The
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.Nm
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driver supports Attansic/Atheros L2 PCIe FastEthernet controllers, and
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is known to support the following hardware:
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.Pp
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.Bl -bullet -compact
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.It
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ASUS EeePC 701
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.It
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ASUS EeePC 900
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.El
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.Pp
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Other hardware may or may not work with this driver.
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.Sh LOADER TUNABLES
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Tunables can be set at the
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.Xr loader 8
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prompt before booting the kernel or stored in
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.Xr loader.conf 5 .
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.Bl -tag -width "xxxxxx"
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.It Va hw.ae.msi_disable
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This tunable disables MSI support on the Ethernet hardware.
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The default value is 0.
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.El
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.Sh SYSCTL VARIABLES
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The
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.Nm
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driver collects a number of useful MAC counter during the work.
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The statistics is available via the
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.Va dev.ae.%d.stats
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.Xr sysctl 8
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tree, where %d corresponds to the controller number.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "ae%d: watchdog timeout."
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The device has stopped responding to the network, or there is a problem with
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the network connection (cable).
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.It "ae%d: reset timeout."
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The card reset operation has been timed out.
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.It "ae%d: Generating random ethernet address."
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No valid Ethernet address was found in the controller NVRAM and registers.
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Random locally administered address with ASUS OUI identifier will be used
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instead.
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.El
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.Sh SEE ALSO
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.Xr altq 4 ,
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.Xr arp 4 ,
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.Xr miibus 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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driver and this manual page was written by
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.An Stanislav Sedov Aq Mt stas@FreeBSD.org .
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It first appeared in
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.Fx 7.1 .
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.Sh BUGS
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The Attansic L2 FastEthernet controller supports DMA but does not use a
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descriptor based transfer mechanism via scatter-gather DMA.
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Thus the data should be copied to/from the controller memory on each
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transmit/receive.
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Furthermore, a lot of data alignment restrictions apply.
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This may introduce a high CPU load on systems with heavy network activity.
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Luckily enough this should not be a problem on modern hardware as L2 does
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not support speeds faster than 100Mbps.
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