303 lines
10 KiB
Groff
303 lines
10 KiB
Groff
.\"-
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.\" Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
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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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.\" without modification.
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.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer
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.\" similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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.\" redistribution must be conditioned upon including a substantially
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.\" similar Disclaimer requirement for further binary redistribution.
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.\"
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.\" NO WARRANTY
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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.\" THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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.\" OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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.\" IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" THE POSSIBILITY OF SUCH DAMAGES.
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.\"
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.\" $FreeBSD$
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.\"/
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.Dd August 28, 2011
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.Dt ATH 4
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.Os
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.Sh NAME
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.Nm ath
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.Nd "Atheros IEEE 802.11 wireless network driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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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 ath"
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.Cd "device ath_pci"
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.Cd "device ath_hal"
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.Cd "options AH_SUPPORT_AR5416"
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.Cd "device ath_rate_sample"
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.Cd "device wlan"
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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_ath_load="YES"
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if_ath_pci_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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driver provides support for wireless network adapters based on
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the Atheros AR5210, AR5211, AR5212, and AR5416 programming APIs.
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These APIs are used by a wide variety of chips; most all chips with
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a PCI and/or CardBus interface are supported.
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.Pp
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Supported features include 802.11 and 802.3 frames, power management, BSS,
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IBSS, MBSS, TDMA, and host-based access point operation modes.
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All host/device interaction is via DMA.
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.Pp
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Please note that from FreeBSD-9.0, the
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.Nm
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driver does not include the PCI/PCIe bus glue.
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The same driver supports multiple underlying bus types, including PCI/PCIe,
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but also embedded (AHB) and USB in the future.
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.Pp
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To enable use for PCI/PCIe systems, see the
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.Xr ath_pci 4
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driver.
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For embedded systems which use the AHB to connect the wireless MAC, see the
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.Xr ath_ahb 4
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driver.
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.Pp
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The
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.Nm
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driver encapsulates all IP and ARP traffic as 802.11 frames, however
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it can receive either 802.11 or 802.3 frames.
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Transmit speed and operating mode is selectable
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and depends on the specific chipset.
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AR5210-based devices support 802.11a operation with transmit speeds
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of 6 Mbps, 9 Mbps, 12 Mbps, 18 Mbps, 24 Mbps, 36 Mbps, 48 Mbps, and 54 Mbps.
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AR5211-based devices support 802.11a and 802.11b operation with transmit
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speeds as above for 802.11a operation and
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1Mbps, 2Mbps, 5.5 Mbps and 11Mbps for 802.11b operation.
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AR5212-based devices support 802.11a, 802.11b, and 802.11g operation
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with transmit speeds appropriate to each.
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AR5416-class devices are capable of 802.11n operation
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but are supported only in legacy modes (802.11a, 11b, 11g).
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Most chips also support an Atheros Turbo Mode (TM) that operates in
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the 5GHz frequency range with 2x the transmit speeds.
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Some chips also support Turbo mode in the 2.4GHz range with 802.11g
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though this support is not presently available due to regulatory requirements.
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(Note that Turbo modes are, however,
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only interoperable with other Atheros-based devices.)
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AR5212-based devices also support half- (10MHz) and quarter-width (5MHz) channels.
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The actual transmit speed used is dependent on signal quality and the
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.Dq "rate control"
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algorithm employed by the driver.
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All chips support WEP encryption.
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AR5212 and AR5416 parts have hardware support for the
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AES-CCM, TKIP, and Michael cryptographic
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operations required for WPA.
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To enable encryption, use
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.Xr ifconfig 8
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as shown below.
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.Pp
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The driver supports
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.Cm station ,
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.Cm adhoc ,
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.Cm adhoc-demo ,
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.Cm hostap ,
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.Cm mesh ,
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.Cm wds ,
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and
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.Cm monitor
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mode operation.
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Multiple
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.Cm hostap
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virtual interfaces may be configured for simultaneous
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use on cards that use a 5212 part.
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When multiple interfaces are configured each may have a separate
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mac address that is formed by setting the U/L bits in the mac
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address assigned to the underlying device.
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Any number of
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.Cm wds
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virtual interfaces may be configured together with
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.Cm hostap
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interfaces.
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Multiple
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.Cm station
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interfaces may be operated together with
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.Cm hostap
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interfaces to construct a wireless repeater device.
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The driver also support
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.Cm tdma
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operation when compiled with
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.Cd "options IEEE80211_SUPPORT_TDMA"
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(which also enables the required 802.11 support).
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Pp
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Devices supported by the
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.Nm
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driver come in either Cardbus or mini-PCI packages.
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Wireless cards in Cardbus slots may be inserted and ejected on the fly.
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.Sh HARDWARE
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The
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.Nm
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driver supports all Atheros Cardbus and PCI cards,
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except those that are based on the AR5005VL chipset.
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.Sh EXAMPLES
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Join a specific BSS network with WEP encryption:
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0
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ifconfig wlan0 inet 192.168.0.20 netmask 0xffffff00 ssid my_net \e
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wepmode on wepkey 0x8736639624
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.Ed
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.Pp
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Join/create an 802.11b IBSS network with network name
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.Dq Li my_net :
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0 wlanmode adhoc
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ifconfig wlan0 inet 192.168.0.22 netmask 0xffffff00 ssid my_net \e
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mode 11b
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.Ed
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.Pp
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Create an 802.11g host-based access point:
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0 wlanmode hostap
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ifconfig wlan0 inet 192.168.0.10 netmask 0xffffff00 ssid my_ap \e
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mode 11g
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.Ed
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.Pp
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Create an 802.11a mesh station:
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0 wlanmode mesh
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ifconfig wlan0 meshid my_mesh mode 11a inet 192.168.0.10/24
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.Ed
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.Pp
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Create two virtual 802.11a host-based access points, one with
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with WEP enabled and one with no security, and bridge them to
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the fxp0 (wired) device:
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0 wlanmode hostap \e
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ssid paying-customers wepmode on wepkey 0x1234567890 \e
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mode 11a up
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ifconfig wlan1 create wlandev ath0 wlanmode hostap bssid \e
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ssid freeloaders up
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ifconfig bridge0 create addm wlan0 addm wlan1 addm fxp0 up
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.Ed
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.Pp
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Create a master node in a two slot TDMA BSS configured to use
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2.5 millisecond slots.
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.Bd -literal -offset indent
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ifconfig wlan0 create wlandev ath0 wlanmode tdma \e
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ssid tdma-test tmdaslot 0 tdmaslotlen 2500 \e
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channel 36 up
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.Ed
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "ath%d: unable to attach hardware; HAL status %u"
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The Atheros Hardware Access Layer was unable to configure the hardware
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as requested.
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The status code is explained in the HAL include file
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.Pa sys/dev/ath/ath_hal/ah.h .
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.It "ath%d: failed to allocate descriptors: %d"
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The driver was unable to allocate contiguous memory for the transmit
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and receive descriptors.
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This usually indicates system memory is scarce and/or fragmented.
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.It "ath%d: unable to setup a data xmit queue!"
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The request to the HAL to set up the transmit queue for normal
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data frames failed.
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This should not happen.
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.It "ath%d: unable to setup a beacon xmit queue!"
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The request to the HAL to set up the transmit queue for 802.11 beacon frames
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frames failed.
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This should not happen.
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.It "ath%d: 802.11 address: %s"
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The MAC address programmed in the EEPROM is displayed.
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.It "ath%d: hardware error; resetting"
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An unrecoverable error in the hardware occurred.
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Errors of this sort include unrecoverable DMA errors.
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The driver will reset the hardware and continue.
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.It "ath%d: rx FIFO overrun; resetting"
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The receive FIFO in the hardware overflowed before the data could be
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transferred to the host.
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This typically occurs because the hardware ran short of receive
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descriptors and had no place to transfer received data.
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The driver will reset the hardware and continue.
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.It "ath%d: unable to reset hardware; hal status %u"
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The Atheros Hardware Access Layer was unable to reset the hardware
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as requested.
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The status code is explained in the HAL include file
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.Pa sys/dev/ath/ath_hal/ah.h .
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This should not happen.
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.It "ath%d: unable to start recv logic"
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The driver was unable to restart frame reception.
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This should not happen.
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.It "ath%d: device timeout"
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A frame dispatched to the hardware for transmission did not complete in time.
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The driver will reset the hardware and continue.
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This should not happen.
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.It "ath%d: bogus xmit rate 0x%x"
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An invalid transmit rate was specified for an outgoing frame.
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The frame is discarded.
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This should not happen.
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.It "ath%d: ath_chan_set: unable to reset channel %u (%u MHz)"
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The Atheros Hardware Access Layer was unable to reset the hardware
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when switching channels during scanning.
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This should not happen.
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.It "ath%d: failed to enable memory mapping"
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The driver was unable to enable memory-mapped I/O to the PCI device registers.
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This should not happen.
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.It "ath%d: failed to enable bus mastering"
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The driver was unable to enable the device as a PCI bus master for doing DMA.
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This should not happen.
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.It "ath%d: cannot map register space"
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The driver was unable to map the device registers into the host address space.
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This should not happen.
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.It "ath%d: could not map interrupt"
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The driver was unable to allocate an IRQ for the device interrupt.
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This should not happen.
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.It "ath%d: could not establish interrupt"
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The driver was unable to install the device interrupt handler.
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This should not happen.
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.El
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.Sh SEE ALSO
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.Xr ath_hal 4 ,
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.Xr cardbus 4 ,
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.Xr intro 4 ,
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.Xr pcic 4 ,
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.Xr wlan 4 ,
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.Xr wlan_ccmp 4 ,
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.Xr wlan_tkip 4 ,
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.Xr wlan_wep 4 ,
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.Xr wlan_xauth 4 ,
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.Xr hostapd 8 ,
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.Xr ifconfig 8 ,
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.Xr wpa_supplicant 8
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 5.2 .
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.Sh CAVEATS
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Revision A1 of the D-LINK DWL-G520 and DWL-G650 are based on an
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Intersil PrismGT chip and are not supported by this driver.
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.Sh BUGS
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There is no software retransmit; only hardware retransmit is used.
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.Pp
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The driver does not fully enable power-save operation of the chip
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in station mode; consequently power use is suboptimal (e.g. on a laptop).
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.Pp
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WPA is not supported for 5210 parts.
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