1.\" Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd May 17, 2019 28.Dt AE 4 29.Os 30.Sh NAME 31.Nm ae 32.Nd "Attansic/Atheros L2 FastEthernet controller driver" 33.Sh SYNOPSIS 34To compile this driver into the kernel, place the following lines in your 35kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device miibus" 38.Cd "device ae" 39.Ed 40.Pp 41Alternatively, to load the driver as a 42module at boot time, place the following line in 43.Xr loader.conf 5 : 44.Bd -literal -offset indent 45if_ae_load="YES" 46.Ed 47.Sh DESCRIPTION 48The 49.Nm 50device driver provides support for Attansic/Atheros L2 PCIe FastEthernet 51controllers. 52.Pp 53The controller supports hardware Ethernet checksum processing, hardware 54VLAN tag stripping/insertion and an interrupt moderation mechanism. 55Attansic L2 also features a 64-bit multicast hash filter. 56.Pp 57The 58.Nm 59driver supports the following media types: 60.Bl -tag -width ".Cm 10baseT/UTP" 61.It Cm autoselect 62Enable autoselection of the media type and options. 63The user can manually override the autoselected mode by 64adding media options to 65.Xr rc.conf 5 . 66.It Cm 10baseT/UTP 67Select 10Mbps operation. 68.It Cm 100baseTX 69Set 100Mbps (FastEthernet) operation. 70.El 71.Pp 72The 73.Nm 74driver provides support for the following media options: 75.Bl -tag -width ".Cm full-duplex" 76.It Cm full-duplex 77Force full duplex operation. 78.It Cm half-duplex 79Force half duplex operation. 80.El 81.Pp 82For more information on configuring this device, see 83.Xr ifconfig 8 . 84.Sh HARDWARE 85The 86.Nm 87driver supports Attansic/Atheros L2 PCIe FastEthernet controllers, and 88is known to support the following hardware: 89.Pp 90.Bl -bullet -compact 91.It 92ASUS EeePC 701 93.It 94ASUS EeePC 900 95.El 96.Pp 97Other hardware may or may not work with this driver. 98.Sh LOADER TUNABLES 99Tunables can be set at the 100.Xr loader 8 101prompt before booting the kernel or stored in 102.Xr loader.conf 5 . 103.Bl -tag -width "xxxxxx" 104.It Va hw.ae.msi_disable 105This tunable disables MSI support on the Ethernet hardware. 106The default value is 0. 107.El 108.Sh SYSCTL VARIABLES 109The 110.Nm 111driver collects a number of useful MAC counter during the work. 112The statistics is available via the 113.Va dev.ae.%d.stats 114.Xr sysctl 8 115tree, where %d corresponds to the controller number. 116.Sh DIAGNOSTICS 117.Bl -diag 118.It "ae%d: watchdog timeout." 119The device has stopped responding to the network, or there is a problem with 120the network connection (cable). 121.It "ae%d: reset timeout." 122The card reset operation has been timed out. 123.It "ae%d: Generating random ethernet address." 124No valid Ethernet address was found in the controller NVRAM and registers. 125Random locally administered address with ASUS OUI identifier will be used 126instead. 127.El 128.Sh SEE ALSO 129.Xr altq 4 , 130.Xr arp 4 , 131.Xr miibus 4 , 132.Xr netintro 4 , 133.Xr ng_ether 4 , 134.Xr vlan 4 , 135.Xr ifconfig 8 136.Sh HISTORY 137The 138.Nm 139driver and this manual page was written by 140.An Stanislav Sedov Aq Mt stas@FreeBSD.org . 141It first appeared in 142.Fx 7.1 . 143.Sh BUGS 144The Attansic L2 FastEthernet controller supports DMA but does not use a 145descriptor based transfer mechanism via scatter-gather DMA. 146Thus the data should be copied to/from the controller memory on each 147transmit/receive. 148Furthermore, a lot of data alignment restrictions apply. 149This may introduce a high CPU load on systems with heavy network activity. 150Luckily enough this should not be a problem on modern hardware as L2 does 151not support speeds faster than 100Mbps. 152