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-rw-r--r--share/man/man4/man4.i386/wl.490
1 files changed, 60 insertions, 30 deletions
diff --git a/share/man/man4/man4.i386/wl.4 b/share/man/man4/man4.i386/wl.4
index 6dc31f4..b6b7860 100644
--- a/share/man/man4/man4.i386/wl.4
+++ b/share/man/man4/man4.i386/wl.4
@@ -41,28 +41,38 @@
The
.Nm
driver controls a radio lan card system made originally by
-NCR, then ATT, now Lucent. The system is spread-spectrum radio
-at around 915 MHz (or 2.4 GHz). With the supplied omni-directional antennae,
+NCR, then ATT, now Lucent.
+The system is spread-spectrum radio
+at around 915 MHz (or 2.4 GHz).
+With the supplied omni-directional antennae,
about 400 feet (indoors, more outdoors) can be covered in circumference.
-This card can talk to the companion (wlp0) pccard. Speeds vary
+This card can talk to the companion (wlp0) pccard.
+Speeds vary
from 1 megabit to theoretically 2 megabits (roughly T1 in speed).
.Pp
The card has three fundamental hardware
units, a so-called PSA or programmable storage area, a radio modem,
-and a ethernet lan controller. The latter component is the
+and a ethernet lan controller.
+The latter component is the
ancient (and not very honorable) Intel 82586 ethernet chip.
Fundamentally it appears to the operating system as an ethernet system,
-and speaks IEEE MAC addresses. The radio modem simply translates
+and speaks IEEE MAC addresses.
+The radio modem simply translates
ethernet packets to/from radio packets, that are either at 2.4 GHz
-or 915 MHz depending on the radio modem. It supports a collision
-avoidance scheme. The lan controller
+or 915 MHz depending on the radio modem.
+It supports a collision
+avoidance scheme.
+The lan controller
supports promiscuous mode, broadcast, and multicasting
(although there is a glitch
-in the latter). "It thinks it is ethernet".
+in the latter).
+"It thinks it is ethernet".
.Pp
How it is used
-depends on the kind of antennae deployed with it. Point to point
-applications are possible as are ethernet-like lan use. The vendor
+depends on the kind of antennae deployed with it.
+Point to point
+applications are possible as are ethernet-like lan use.
+The vendor
ships an omni-directional antennae that works in the
vicinity of 400 feet (indoors).
Point to point antennae can be purchased that will go miles.
@@ -72,7 +82,8 @@ Typically minimally an IRQ, port, and Network ID must be supplied.
Michael Smith's
.Xr wlconfig 8
utility can now be used to do this work from
-the UNIX side. The card is "not" plug and play.
+the UNIX side.
+The card is "not" plug and play.
The network id controls whether one set of cards can hear another.
If different, cards will read physical packets, but they will be discarded
by the radio modem.
@@ -85,13 +96,17 @@ variables are as follows:
.Bl -diag
.It "machdep.wl_xmit_delay <useconds>"
This variable will cause the driver to insert a delay on transmit.
-250 is the default. The delay should probably be a bit longer
-on faster cpus and less on slower cpus. It exists because the 82586
+250 is the default.
+The delay should probably be a bit longer
+on faster cpus and less on slower cpus.
+It exists because the 82586
was not designed to work with Pentium-speed cpu systems and if overdriven
will have copious xmit side errors.
.It machdep.wl_ignore_nwid <0 | 1>
-This switch defaults to 0; i.e., the nwid is not ignored. It can
-be set to 1 to cause the nwid to not be used. This may be useful
+This switch defaults to 0; i.e., the nwid is not ignored.
+It can
+be set to 1 to cause the nwid to not be used.
+This may be useful
when the device is in promiscuous mode as one can watch for all
packets and ignore nwid differences.
.It machdep.wl_xmit_watch <milliseconds>
@@ -99,33 +114,42 @@ This switch is not currently useful.
.It machdep.wl_gather_snr <milliseconds>
This switch is not currently useful.
.Pp
-There is also a signal strength cache in the driver. It may be interrogated
+There is also a signal strength cache in the driver.
+It may be interrogated
with
.Xr wlconfig 8 .
Incoming packets
are checked for certain hardware radio-modem values including signal
strength, silence, and quality, which range fro 0..63, 0..63, and 0..15
-respectively. Thus one can read out signal strenth values to see
-how close/far peer nodes are. The signal strength cache is indexed by
+respectively.
+Thus one can read out signal strenth values to see
+how close/far peer nodes are.
+The signal strength cache is indexed by
sender MAC address.
-There are two sysctls that change how it filters packets. Both are on
+There are two sysctls that change how it filters packets.
+Both are on
by default.
.It machdep.wl_wlcache_mcastonly <0 | 1>
By default this switch is on.
It forces the cache to filter out
-unicast packets. Only broadcast or multicast packets are accepted.
+unicast packets.
+Only broadcast or multicast packets are accepted.
.It machdep.wl_wlcache_iponly <0 | 1>
-By default this switch is on. It forces the driver to discard non-IP
-packets and also stores the IP src address. ARP packets are ignored,
+By default this switch is on.
+It forces the driver to discard non-IP
+packets and also stores the IP src address.
+ARP packets are ignored,
as are any other network protocol barring IPv4 packets.
.El
.Sh CAVEATS
-The 82586 has numerous defects. It may experience transmit-side
+The 82586 has numerous defects.
+It may experience transmit-side
errors when modern faster cpus send packets at it faster than it can handle.
The driver (and probably the chip) does not support an all multicast mode.
As a result, it can be used with applications like
.Xr mrouted 8 ,
-but it must go into promiscuous mode for that to work. The driver
+but it must go into promiscuous mode for that to work.
+The driver
is slow to change modes from "normal" to promiscuous mode, presumably
due to delays in the configuration code.
.Sh SEE ALSO
@@ -139,9 +163,11 @@ The
driver was written by
.An Anders Klemets
(thousands of years ago?) and
-appears to be based on an even older Intel 82586 driver. The 82586
+appears to be based on an even older Intel 82586 driver.
+The 82586
controller was one of the first (if not the first?) integrated lan
-controller on the block. That does not mean it was the best either.
+controller on the block.
+That does not mean it was the best either.
Anders ported and or created a driver for the ISA wavelan and PCCARD
wavelan system too (wlp).
.An Robert T. Morris, Jr.
@@ -150,12 +176,16 @@ ported the Mach drivers to BSDI.
ported them to
.Fx 2.1 .
.An Michael Smith
-ported the wl driver only to 2.2.2. Jim and Michael have been
-maintaining them. The current state of the driver is NOT ANYONE'S
-FAULT. Thanks to
+ported the wl driver only to 2.2.2.
+Jim and Michael have been
+maintaining them.
+The current state of the driver is NOT ANYONE'S
+FAULT.
+Thanks to
.An Bernie Doehner
and
.An Robert Buaas
for contributions.
.Sh AUTHORS
-Too numerous to mention. See above.
+Too numerous to mention.
+See above.
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