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 October 24, 2018 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 DEPRECATION NOTICE 48The 49.Nm 50driver is not present in 51.Fx 13.0 52and later. 53See https://github.com/freebsd/fcp/blob/master/fcp-0101.md for more 54information. 55.Sh DESCRIPTION 56The 57.Nm 58device driver provides support for Attansic/Atheros L2 PCIe FastEthernet 59controllers. 60.Pp 61The controller supports hardware Ethernet checksum processing, hardware 62VLAN tag stripping/insertion and an interrupt moderation mechanism. 63Attansic L2 also features a 64-bit multicast hash filter. 64.Pp 65The 66.Nm 67driver supports the following media types: 68.Bl -tag -width ".Cm 10baseT/UTP" 69.It Cm autoselect 70Enable autoselection of the media type and options. 71The user can manually override the autoselected mode by 72adding media options to 73.Xr rc.conf 5 . 74.It Cm 10baseT/UTP 75Select 10Mbps operation. 76.It Cm 100baseTX 77Set 100Mbps (FastEthernet) operation. 78.El 79.Pp 80The 81.Nm 82driver provides support for the following media options: 83.Bl -tag -width ".Cm full-duplex" 84.It Cm full-duplex 85Force full duplex operation. 86.It Cm half-duplex 87Force half duplex operation. 88.El 89.Pp 90For more information on configuring this device, see 91.Xr ifconfig 8 . 92.Sh HARDWARE 93The 94.Nm 95driver supports Attansic/Atheros L2 PCIe FastEthernet controllers, and 96is known to support the following hardware: 97.Pp 98.Bl -bullet -compact 99.It 100ASUS EeePC 701 101.It 102ASUS EeePC 900 103.El 104.Pp 105Other hardware may or may not work with this driver. 106.Sh LOADER TUNABLES 107Tunables can be set at the 108.Xr loader 8 109prompt before booting the kernel or stored in 110.Xr loader.conf 5 . 111.Bl -tag -width "xxxxxx" 112.It Va hw.ae.msi_disable 113This tunable disables MSI support on the Ethernet hardware. 114The default value is 0. 115.El 116.Sh SYSCTL VARIABLES 117The 118.Nm 119driver collects a number of useful MAC counter during the work. 120The statistics is available via the 121.Va dev.ae.%d.stats 122.Xr sysctl 8 123tree, where %d corresponds to the controller number. 124.Sh DIAGNOSTICS 125.Bl -diag 126.It "ae%d: watchdog timeout." 127The device has stopped responding to the network, or there is a problem with 128the network connection (cable). 129.It "ae%d: reset timeout." 130The card reset operation has been timed out. 131.It "ae%d: Generating random ethernet address." 132No valid Ethernet address was found in the controller NVRAM and registers. 133Random locally administered address with ASUS OUI identifier will be used 134instead. 135.El 136.Sh SEE ALSO 137.Xr altq 4 , 138.Xr arp 4 , 139.Xr miibus 4 , 140.Xr netintro 4 , 141.Xr ng_ether 4 , 142.Xr vlan 4 , 143.Xr ifconfig 8 144.Sh HISTORY 145The 146.Nm 147driver and this manual page was written by 148.An Stanislav Sedov Aq Mt stas@FreeBSD.org . 149It first appeared in 150.Fx 7.1 . 151.Sh BUGS 152The Attansic L2 FastEthernet controller supports DMA but does not use a 153descriptor based transfer mechanism via scatter-gather DMA. 154Thus the data should be copied to/from the controller memory on each 155transmit/receive. 156Furthermore, a lot of data alignment restrictions apply. 157This may introduce a high CPU load on systems with heavy network activity. 158Luckily enough this should not be a problem on modern hardware as L2 does 159not support speeds faster than 100Mbps. 160