0afc94c17a
bottom of the manpages and order them consistently. GNU groff doesn't care about the ordering, and doesn't even mention CAVEATS and SECURITY CONSIDERATIONS as common sections and where to put them. Found by: mdocml lint run Reviewed by: ru
192 lines
6.7 KiB
Groff
192 lines
6.7 KiB
Groff
.\"
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.\" Copyright (c) 1997, Jim Binkley
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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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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Jim Binkley
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd September 29, 2006
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.Dt WL 4 i386
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.Os
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.Sh NAME
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.Nm wl
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.Nd T1 speed ISA/radio lan card
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.Sh SYNOPSIS
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.Cd "device wl0 at isa? port 0x300 irq 5"
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.Sh DESCRIPTION
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The
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.Nm
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driver controls a radio lan card system made originally by
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NCR, then ATT, now Lucent.
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The system is spread-spectrum radio
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at around 915 MHz (or 2.4 GHz).
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With the supplied omni-directional antennae,
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about 400 feet (indoors, more outdoors) can be covered in circumference.
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This card can talk to the companion (wlp0) pccard.
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Speeds vary
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from 1 megabit to theoretically 2 megabits (roughly T1 in speed).
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.Pp
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The card has three fundamental hardware
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units, a so-called PSA or programmable storage area, a radio modem,
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and a Ethernet lan controller.
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The latter component is the
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ancient (and not very honorable) Intel 82586 Ethernet chip.
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Fundamentally it appears to the operating system as an Ethernet system,
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and speaks IEEE MAC addresses.
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The radio modem simply translates
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Ethernet packets to/from radio packets, that are either at 2.4 GHz
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or 915 MHz depending on the radio modem.
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It supports a collision
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avoidance scheme.
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The lan controller
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supports promiscuous mode, broadcast, and multicasting
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(although there is a glitch
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in the latter).
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"It thinks it is Ethernet".
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.Pp
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How it is used
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depends on the kind of antennae deployed with it.
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Point to point
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applications are possible as are Ethernet-like lan use.
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The vendor
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ships an omni-directional antennae that works in the
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vicinity of 400 feet (indoors).
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Point to point antennae can be purchased that will go miles.
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.Sh SETUP
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The card can either be initialized with the vendor supplied DOS setup software.
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Typically minimally an IRQ, port, and Network ID must be supplied.
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Michael Smith's
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.Xr wlconfig 8
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utility can now be used to do this work from
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the UNIX side.
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The card is "not" plug and play.
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The network id controls whether one set of cards can hear another.
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If different, cards will read physical packets, but they will be discarded
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by the radio modem.
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.Sh CONTROL
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In addition to the config utility, there are several sysctl
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switches that can be used to modify runtime parameters.
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The
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.Xr sysctl 8
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variables are as follows:
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.Bl -diag
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.It "machdep.wl_xmit_delay <useconds>"
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This variable will cause the driver to insert a delay on transmit.
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250 is the default.
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The delay should probably be a bit longer
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on faster cpus and less on slower cpus.
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It exists because the 82586
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was not designed to work with Pentium-speed cpu systems and if overdriven
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will have copious xmit side errors.
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.It machdep.wl_ignore_nwid <0 | 1>
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This switch defaults to 0; i.e., the nwid is not ignored.
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It can
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be set to 1 to cause the nwid to not be used.
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This may be useful
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when the device is in promiscuous mode as one can watch for all
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packets and ignore nwid differences.
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.It machdep.wl_xmit_watch <milliseconds>
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This switch is not currently useful.
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.It machdep.wl_gather_snr <milliseconds>
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This switch is not currently useful.
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.Pp
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There is also a signal strength cache in the driver.
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It may be interrogated
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with
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.Xr wlconfig 8 .
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Incoming packets
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are checked for certain hardware radio-modem values including signal
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strength, silence, and quality, which range fro 0..63, 0..63, and 0..15
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respectively.
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Thus one can read out signal strenth values to see
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how close/far peer nodes are.
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The signal strength cache is indexed by
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sender MAC address.
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There are two sysctls that change how it filters packets.
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Both are on
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by default.
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.It machdep.wl_wlcache_mcastonly <0 | 1>
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By default this switch is on.
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It forces the cache to filter out
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unicast packets.
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Only broadcast or multicast packets are accepted.
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.It machdep.wl_wlcache_iponly <0 | 1>
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By default this switch is on.
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It forces the driver to discard non-IP
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packets and also stores the IP src address.
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ARP packets are ignored,
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as are any other network protocol barring IPv4 packets.
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.El
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.Sh SEE ALSO
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.Xr sysctl 8 ,
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.Xr wlconfig 8
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.Pp
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.Pa http://www.wavelan.com
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.Sh HISTORY
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The
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.Nm
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driver was written by
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.An Anders Klemets
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(thousands of years ago?) and
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appears to be based on an even older Intel 82586 driver.
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The 82586
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controller was one of the first (if not the first?) integrated lan
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controller on the block.
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That does not mean it was the best either.
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Anders ported and or created a driver for the ISA wavelan and PCCARD
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wavelan system too (wlp).
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.An Robert T. Morris, Jr.
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ported the Mach drivers to BSDI.
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.An Jim Binkley
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ported them to
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.Fx 2.1 .
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.An Michael Smith
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ported the wl driver only to 2.2.2.
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Jim and Michael have been
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maintaining them.
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The current state of the driver is NOT ANYONE'S
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FAULT.
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Thanks to
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.An Bernie Doehner
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and
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.An Robert Buaas
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for contributions.
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.Sh AUTHORS
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Too numerous to mention.
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See above.
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.Sh CAVEATS
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The 82586 has numerous defects.
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It may experience transmit-side
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errors when modern faster cpus send packets at it faster than it can handle.
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The driver (and probably the chip) does not support an all multicast mode.
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As a result, it can be used with applications like
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.Xr mrouted 8 Pq Pa ports/net/mrouted ,
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but it must go into promiscuous mode for that to work.
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The driver
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is slow to change modes from "normal" to promiscuous mode, presumably
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due to delays in the configuration code.
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