.\" $OpenBSD: atw.4,v 1.28 2008/07/29 17:03:35 jmc Exp $ .\" $NetBSD: atw.4,v 1.8 2004/06/06 04:05:49 wiz Exp $ .\" .\" Copyright (c) 2003 .\" David Young . All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the author nor the names of any co-contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY David Young AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL David Young .\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF .\" THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: July 29 2008 $ .Dt ATW 4 .Os .Sh NAME .Nm atw .Nd ADMtek ADM8211 IEEE 802.11b wireless network device .Sh SYNOPSIS .Cd "atw* at cardbus?" .Cd "atw* at pci?" .Sh DESCRIPTION The .Nm driver supports PCI/CardBus 802.11b wireless adapters based on the ADMtek ADM8211. .Pp The ADM8211 is a bus-mastering 802.11 Media Access Controller (MAC) which is derived from ADMtek's DEC/Intel 21143 clones (see .Xr dc 4 for more information). It supports contention-free traffic (with an 802.11 Point Coordinator). The ADM8211 integrates an RF3000 baseband processor (BBP) by RF Microdevices. .Pp In a typical application, the ADM8211 is coupled with an RF front-end by RFMD and a Silicon Laboratories Si4126 RF/IF synthesizer. .Pp With the ADM8211, the division of labor between the host and NIC is different than with firmware-based NICs such as .Xr an 4 and .Xr wi 4 . The ADM8211 is still responsible for real-time 802.11 functions such as sending ACK/RTS/CTS/ATIM frames, sending beacons, and answering CF polls from the access point, but the host takes responsibility for providing 802.11 functions such as scanning, association, and authentication. The host is also responsible for programming both the BBP and the RF/IF synthesizer. .Pp These are the modes the .Nm driver can operate in: .Bl -tag -width "IBSS-masterXX" .It BSS mode Also known as .Em infrastructure mode, this is used when associating with an access point, through which all traffic passes. This mode is the default. .It IBSS mode Also known as .Em IEEE ad-hoc mode or .Em peer-to-peer mode. This is the standardized method of operating without an access point. Stations associate with a service set. However, actual connections between stations are peer-to-peer. .El .Pp The .Nm driver can be configured to use hardware Wireless Equivalent Privacy (WEP) (though see .Sx BUGS , below). It is strongly recommended that WEP not be used as the sole mechanism to secure wireless communication, due to serious weaknesses in it. .Pp The .Nm driver can be configured at runtime with .Xr ifconfig 8 or on boot with .Xr hostname.if 5 . .Sh HARDWARE The .Nm driver supports PCI and CardBus cards using revisions 0x11 and 0x15 of the ADM8211 (aka ADM8211A) and revision 0x20 (aka ADM8211B). This includes: .Pp .Bl -tag -width Ds -offset indent -compact .It 3Com OfficeConnect 3CRSHPW796 CardBus .It Belkin F5D6001 PCI (version 2 only) .It Blitz NetWave Point CardBus .It D-Link DWL-650 Rev. \&L1 CardBus .It D-Link DWL-520 Rev. \&C1 PCI .It LanReady WP2000 PCI .It SMC 2635W CardBus (version 1 only) .It TRENDnet TEW-221PC CardBus .It Xterasys XN2511B PCI .El .Pp The .Nm driver does not yet support cards using revision 0x30 (ADM8211C). .\"This includes: .\".Pp .\".Bl -tag -width Ds -offset indent -compact .\".El .Sh EXAMPLES The following .Xr hostname.if 5 example configures atw0 to join whatever network is available on boot, using WEP key .Dq 0x1deadbeef1 , channel 11, obtaining an IP address using DHCP: .Bd -literal -offset indent dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11 .Ed .Pp Configure atw0 for WEP, using hex key .Dq 0x1deadbeef1 : .Bd -literal -offset indent # ifconfig atw0 nwkey 0x1deadbeef1 .Ed .Pp Return atw0 to its default settings: .Bd -literal -offset indent # ifconfig atw0 -bssid -chan media autoselect \e nwid "" -nwkey .Ed .Pp Join an existing BSS network, .Dq my_net : .Bd -literal -offset indent # ifconfig atw0 192.168.1.1 netmask 0xffffff00 nwid my_net .Ed .Sh DIAGNOSTICS .Bl -diag .It "atw0: failed to tune channel %d" The driver failed to tune the radio to a new channel. The radio remains tuned to the old channel. .It "atw0: atw_si4136_write wrote %08x, SYNCTL still busy" The driver waited 100ms without seeing an indication that the ADM8211 had finished writing a register on the Si4126 RF/IF synthesizer. .It "atw0: device timeout" The ADM8211 failed to generate an interrupt to acknowledge a transmit command. .El .Sh SEE ALSO .Xr arp 4 , .Xr cardbus 4 , .Xr ifmedia 4 , .Xr intro 4 , .Xr netintro 4 , .Xr pci 4 , .Xr hostname.if 5 , .Xr ifconfig 8 .Rs .%T ADMtek .%O http://www.admtek.com.tw .Re .Rs .%T Silicon Laboratories .%O http://www.silabs.com .Re .Rs .%T RF Micro Devices .%O http://www.rfmd.com .Re .Sh HISTORY The .Nm device driver first appeared in .Ox 3.6 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An David Young .Aq dyoung@NetBSD.org . For features which the ADM8211 has in common with the DECchip 21x4x, code was liberally borrowed from the .Nx tlp driver by .An Jason Thorpe .Aq thorpej@NetBSD.org . .Sh BUGS The author does not fully understand what processing the duration fields for the PLCP header and the 802.11 header undergo before they are applied to a transmitted frame. If the duration fields in transmitted frames are incorrect, network performance may suffer. .Pp The driver does not provide rate control when the media type is set to autoselect. .Pp The driver lets you change to Host AP mode, but it does not work and it probably never will. .Pp The driver will sometimes complain that it cannot re-tune the radio because the transmit process has not gone idle. The author is investigating. .Pp Many features are still missing, especially WEP decryption and 802.11 power-saving. .Pp The ad-hoc mode has not been rigorously tested. IBSSs with the same SSID may not coalesce, but this should not matter for most applications. .Pp The driver is untested in the ad-hoc demo mode of Lucent WaveLAN cards. .Pp The ADM8211 supports 802.11 power-saving; however, .Nm does not support it yet. For time-bounded service, the ADM8211 will interoperate with an access point which implements the 802.11 Point Coordination Function; however, this is also not supported. .Pp Combinations of an ADM8211 with either an Intersil or a Marvell RF front-end are not supported. .Pp .Nm contains incomplete support for the ADM8211's WEP encryption/decryption engine. .Nm does not yet support hardware WEP decryption; however, it will use the ADM8211's crypto engine to encrypt transmitted frames. Documentation from ADMtek claims that, in addition to the 4 104-bit shared WEP keys, the ADM8211 will store WEP key pairs for up to 20 peers. The documentation provides no details, hence .Nm does not support the 20 key-pairs.