ath -- Atheros IEEE 802.11 driver
device ath
device ath_hal
device wlan
The ath driver provides support for wireless network adapters based on
the Atheros AR5210, AR5211, and AR5212 chips. Chip-specific support is
provided by the Atheros Hardware Access Layer (HAL), that is packaged
separately.
Supported features include 802.11 and 802.3 frames, power management,
BSS, IBSS, and host-based access point operation modes. All host/device
interaction is via DMA.
The ath driver encapsulates all IP and ARP traffic as 802.11 frames, however
it can receive either 802.11 or 802.3 frames. Transmit speed and
operating mode is selectable depending on your hardware. AR5210-based
devices support 802.11a operation with transmit speeds of 6 Mbps, 9 Mbps,
12 Mbps, 18 Mbps, 24 Mbps, 36 Mbps, 48 Mbps, and 54 Mbps. AR5211-based
devices support 802.11a and 802.11b operation with transmit speeds as
above for 802.11a operation and 1Mbps, 2Mbps, 5.5 Mbps and 11Mbps for
802.11b operation. AR5212-based devices support 802.11a, 802.11b, and
802.11g operation with transmit speeds appropriate to each. All chips
also support an Atheros Turbo Mode (TM) that operates in the 802.11a frequency
range with 2x the transmit speeds. (This mode is, however, only
interoperable with other Atheros-based devices.) The actual transmit
speed used is dependent on signal quality and the ``rate control'' algorithm
employed by the driver. All chips support WEP encryption. AR5211
and AR5212 support the AES, TKIP, and Michael cryptographic operations
required for WPA but at this time the driver does not support them. To
enable encryption, use ifconfig(8) as shown below.
By default, the ath driver configures the card for BSS operation (aka infrastructure
mode). This mode requires the use of an access point (base
station).
The ath driver also supports the standard IBSS point-to-point mode where
stations can communicate amongst themselves without the aid of an access
point.
The driver may also be configured to operate in hostap mode. In this
mode a host may function as an access point (base station). Access
points are different than operating in IBSS mode. They operate in BSS
mode. They allow for easier roaming and bridge all ethernet traffic such
that machines connected via an access point appear to be on the local
ethernet segment.
For more information on configuring this device, see ifconfig(8).
Devices supported by the ath driver come in either Cardbus or mini-PCI
packages. Wireless cards in Cardbus slots may be inserted and ejected on
the fly.
The following cards are among those supported by the ath driver:
Card Chip Bus Standard
Aztech WL830PC AR5212 CardBus b/g
D-Link DWL-A650 AR5210 CardBus a
D-Link DWL-AB650 AR5211 CardBus a/b
D-Link DWL-A520 AR5210 PCI a
D-Link DWL-AG520 AR5212 PCI a/b/g
D-Link DWL-AG650 AR5212 CardBus a/b/g
D-Link DWL-G520B AR5212 PCI b/g
D-Link DWL-G650B AR5212 CardBus b/g
Elecom LD-WL54AG AR5212 Cardbus a/b/g
Elecom LD-WL54 AR5211 Cardbus a
Fujitsu E5454 AR5212 Cardbus a/b/g
Fujitsu FMV-JW481 AR5212 Cardbus a/b/g
Fujitsu E5454 AR5212 Cardbus a/b/g
HP NC4000 AR5212 PCI a/b/g
I/O Data WN-AB AR5212 CardBus a/b
I/O Data WN-AG AR5212 CardBus a/b/g
I/O Data WN-A54 AR5212 CardBus a
Linksys WMP55AG AR5212 PCI a/b/g
Linksys WPC51AB AR5211 CardBus a/b
Linksys WPC55AG AR5212 CardBus a/b/g
NEC PA-WL/54AG AR5212 CardBus a/b/g
Netgear WAG311 AR5212 PCI a/b/g
Netgear WAB501 AR5211 CardBus a/b
Netgear WAG511 AR5212 CardBus a/b/g
Netgear WG311 AR5212 PCI b/g
Netgear WG511T AR5212 PCI b/g
Orinoco 8480 AR5212 CardBus a/b/g
Orinoco 8470WD AR5212 CardBus a/b/g
Proxim Skyline 4030 AR5210 CardBus a
Proxim Skyline 4032 AR5210 PCI a
Samsung SWL-5200N AR5212 CardBus a/b/g
SMC SMC2735W AR5210 CardBus a
Sony PCWA-C700 AR5212 Cardbus a/b
Sony PCWA-C300S AR5212 Cardbus b/g
Sony PCWA-C500 AR5210 Cardbus a
3Com 3CRPAG175 AR5212 CardBus a/b/g
An up to date list can be found at
http://customerproducts.atheros.com/customerproducts.
Join an existing BSS network (ie: connect to an access point):
ifconfig ath0 inet 192.168.0.20 netmask 0xffffff00
Join a specific BSS network with network name ``my_net'':
ifconfig ath0 inet 192.168.0.20 netmask 0xffffff00 ssid my_net
Join a specific BSS network with WEP encryption:
ifconfig ath0 inet 192.168.0.20 netmask 0xffffff00 ssid my_net \
wepmode on wepkey 0x8736639624
Join/create an 802.11b IBSS network with network name ``my_net'':
ifconfig ath0 inet 192.168.0.22 netmask 0xffffff00 ssid my_net \
mode 11b mediaopt adhoc
Create an 802.11g host-based access point:
ifconfig ath0 inet 192.168.0.10 netmask 0xffffff00 ssid my_ap \
mode 11g mediaopt hostap
Create an 802.11a host-based access point with WEP enabled:
ifconfig ath0 inet 192.168.0.10 netmask 0xffffff00 ssid my_ap \
wepmode on wepkey 0x1234567890 mode 11a mediaopt hostap
Create a host-based wireless bridge to fxp0:
Add BRIDGE to the kernel config.
ifconfig ath0 inet up ssid my_ap media DS/11Mbps mediaopt hostap
sysctl net.link.ether.bridge.enable=1
sysctl net.link.ether.bridge.config="ath0 fxp0"
sysctl net.inet.ip.forwarding=1
This will give you the same functionality as an access point.
ath%d: unable to attach hardware; HAL status %u The Atheros Hardware
Access Layer was unable to configure the hardware as requested. The status
code is explained in the HAL include file sys/contrib/dev/ath/ah.h.
ath%d: failed to allocate descriptors: %d The driver was unable to allocate
contiguous memory for the transmit and receive descriptors. This
usually indicates system memory is scarce and/or fragmented.
ath%d: unable to setup a data xmit queue! The request to the HAL to setup
the transmit queue for normal data frames failed. This should not
happen.
ath%d: unable to setup a beacon xmit queue! The request to the HAL to
setup the transmit queue for 802.11 beacon frames frames failed. This
should not happen.
ath%d: 802.11 address: %s The MAC address programmed in the EEPROM is
displayed.
ath%d: hardware error; resetting An unrecoverable error in the hardware
occurred. Errors of this sort include unrecoverable DMA errors. The
driver will reset the hardware and continue.
ath%d: rx FIFO overrun; resetting The receive FIFO in the hardware overflowed
before the data could be transferred to the host. This typically
occurs because the hardware ran short of receive descriptors and had no
place to transfer received data. The driver will reset the hardware and
continue.
ath%d: unable to reset hardware; hal status %u The Atheros Hardware
Access Layer was unable to reset the hardware as requested. The status
code is explained in the HAL include file sys/contrib/dev/ath/ah.h. This
should not happen.
ath%d: unable to start recv logic The driver was unable to restart frame
reception. This should not happen.
ath%d: device timeout A frame dispatched to the hardware for transmission
did not complete in time. The driver will reset the hardware and
continue. This should not hapen.
ath%d: bogus xmit rate 0x%x An invalid transmit rate was specified for
an outgoing frame. The frame is discarded. This should not happen.
ath%d: ath_chan_set: unable to reset channel %u (%u Mhz) The Atheros
Hardware Access Layer was unable to reset the hardware when switching
channels during scanning. This should not happen.
ath%d: unable to allocate channel table The driver was unable to allocate
memory for the table used to hold the set of available channels.
ath%d: unable to collect channel list from hal A problem occurred while
querying the HAL to find the set of available channels for the device.
This should not happen.
ath%d: %s: %dM -> %dM (%d ok, %d err, %d retr) The driver's rate control
algorithm changed the current rate for transmitting frames. This message
is temporarily enabled for normal use to help in diagnosing and improving
the rate control algorithm. The message indicates the new and old transmit
rates and the statistics it used to decide on this change.
ath%d: failed to enable memory mapping The driver was unable to enable
memory-mapped I/O to the PCI device registers. This should not happen.
ath%d: failed to enable bus mastering The driver was unable to enable
the device as a PCI bus master for doing DMA. This should not happen.
ath%d: cannot map register space The driver was unable to map the device
registers into the host address space. This should not happen.
ath%d: could not map interrupt The driver was unable to allocate an IRQ
for the device interrupt. This should not happen.
ath%d: could not establish interrupt The driver was unable to install
the device interrupt handler. This should not happen.
an(4), arp(4), ath_hal(4), card(4), netintro(4), pcic(4), wi(4), wlan(4),
ifconfig(8), wicontrol(8)
The ath device driver first appeared in FreeBSD 5.2.
Different regulatory domains have different default channels for adhoc
mode. See ifconfig(8) for information on how to change the channel. See
wicontrol(8) for information on different regulatory domains. Different
regulatory domains may not be able to communicate with each other with
802.11a as different regualtory domains do not necessarily have overlapping
channels.
Revision A1 of the D-LINK DWL-G520 and DWL-G650 are based on an Intersil
PrismGT chip and are not supported by this driver.
Performance in lossy environments is suboptimal. The algorithm used to
select the rate for transmitted packets is very simplistic. There is no
software retransmit; only hardware retransmit is used. Contributors are
encouraged to replace the existing rate control algorithm with a better
one (hint: all the information needed is availble to the driver).
The driver does not fully enable power-save operation of the chip; consequently
power use is suboptimal.
FreeBSD 5.2.1 November 4, 2003 FreeBSD 5.2.1 [ Back ] |
