3C575_CB(4) Kernel Interfaces Manual 3C575_CB(4)NAME
3c575_cb - 3Com 3c575 Etherlink XL 10/100 CardBus device driver
SYNOPSIS
insmod 3c575_cb.o [debug=n] [rx_copybreak=n] [max_interrupt_work=n] [use_hw_csums=n] [down_poll_rate=n] [auto_polarity=n]
DESCRIPTION
3c575_cb is the low-level Card Services driver for the 3Com 3c575 EtherLink XL CardBus series ethernet adapters. When this driver is
attached to a card, it allocates the next available ethernet device (eth0..eth#). This information for this card will be reported in the
kernel log file, and the device name passed on to cardmgr(8).
The driver uses the N-Way autonegotiating transceiver to negotiate the speed and duplex of the network link. If the link partner does not
support negotiation only the link speed is detected.
If the on-card EEPROM is programmed for a full-duplex (FD) link, only FD media types are advertised and the link is assumed to be full-
duplex.
PARAMETERS
rx_copybreak=n
Set the breakpoint for copying incoming frames into reduced-sized packet buffers. The default value of 200 bytes is reasonable for
most systems.
max_interrupt_work=n
This option selects the maximum amount of work handled during each interrupt. Each received packet counts as one unit of work, as
does updating statistics counters and handling errors. The default value of 32 should only need to be increased on very slow
machines. An occasional "too much work in interrupt" message is not a problem.
use_hw_csums=n
Controls use of an adapter's on-board TCP/IP checksum verification for incoming packets. This is on by default; setting to 0 dis-
ables hardware checksums. It may be useful to disable hardware checksums if it is suspected that something is corrupting data on
its way from the card to the CPU.
down_poll_rate=n
For Cyclone and Tornado chipsets, this is the rate at which the card polls the transmit ring for new packets. The value is in units
of 320 ns; a value of 0 disables polling. The default is 20 (6.4 us), and the maximum allowed value is 127. Polling is more effi-
cient but can consume a significant amount of PCI bus bandwidth.
This flag can be used to control the transceiver's auto polarity
detection capability. Some Cisco Catalyst switches are known to interact badly with this feature in 10baseT mode. It defaults to 1
(enabled).
AUTHOR
This driver: Donald Becker - becker@scyld.com
Linux PC Card control software: David Hinds - dahinds@users.sourceforge.net et al.
SEE ALSO cardmgr(8), pcmcia(5).
pcmcia-cs 2001/06/22 01:12:38 3C575_CB(4)
Check Out this Related Man Page
WAVELAN_CS(4) Kernel Interfaces Manual WAVELAN_CS(4)NAME
wavelan_cs - AT&T GIS WaveLAN PCMCIA device driver
SYNOPSIS
insmod wavelan_cs.o [irq_list=i,j,...] [mem_speed=n] [do_roaming=n]
DESCRIPTION
wavelan_cs is the low-level Card Services driver for the NCR / AT&T / Lucent WaveLAN PCMCIA and Digital (DEC) RoamAbout DS wireless ether-
net adapter. When this driver is attached to a card, it allocates the next available ethernet device (eth0..eth#). This device name will
be passed on to cardmgr(8) for the card configuration, and reported in the kernel log file with the MAC address, NWID and frequency used by
the card.
PARAMETERS
irq_list=i,j,...
Specifies the set of interrupts that may be allocated by this driver.
mem_speed=n
Sets the access speed of the shared memory window, in nanoseconds. The default is 0 (i.e., no extra wait states).
do_roaming=n
Enables or disables roaming mode. The default is 1 (roam).
WIRELESS EXTENSIONS
Use iwconfig(8) to manipulate wireless extensions.
Mode
Set the operating mode to Ad-Hoc or Managed. This in fact disable or enable roaming support. This setting is not saved in hardware.
Network ID
Set the network ID [0 to FFFF] or disable it [off] or reenable it [on]. As the NWID is stored in the card Permanent Storage Area, it will
be reuse at any further invocation of the driver.
Frequency & channels
For the 2.4GHz 2.00 Hardware, you are able to set the frequency by specifying one of the 10 defined channels (2.412, 2.422, 2.425, 2.4305,
2.432, 2.442, 2.452, 2.460, 2.462 or 2.484) or directly by its value. The frequency is changed immediately and permanentely. Frequency
availability depend on the regulations...
Sensitivity
Signal level threshold for packet reception [0 to 63]. Should be set according to the ambiant noise level.
Encryption key
Set the encryption key [0 to FFFF-FFFF-FFFF-FFFF]. Use [off] and [on] to disable and reenable the hardware encryption. This feature works
only for device with encryption option (DES or AES).
Statistics spy
Set a list of MAC addresses in the driver (up to 8) and get the last quality of link for each of those (see iwspy(8)).
/proc/net/wireless
status is the status reported by the modem. Link quality reports the quality of the modulation on the air (direct sequence spread spec-
trum) [max = 16]. Level and Noise refer to the signal level and noise level [max = 64]. The crypt discarded packet and misc discarded
packet counters are not implemented.
PRIVATE IOCTL
You may use iwpriv(8) to manipulate private ioctls.
Quality threshold
Enable you the define the quality threshold used by the modem (packet below that level are discarded).
Histogram
This functionality allow to set a number of signal level intervals and to count the number of packets received in each of those defined
intervals. This distribution might be used to calculate the mean value and standard deviation of the signal level.
OTHER FEATURES
Hot unplug support.
Power saving (use 'ifconfig down').
SPECIFIC NOTES
This driver will fail to load some non NCR/ATT&T/Lucent Wavelan cards. If it's your case, you must look in the source code on how to add
your card to the detection routine.
Some of the mentioned features are optional. You may enable to disable them by changing flags in the driver header and recompile.
AUTHOR
Anthony D. Joseph - adj@lcs.mit.edu
Jean Tourrilhes - jt@hplb.hpl.hp.com
(+ others - see source code for details)
SEE ALSO wavelan(4), cardmgr(8), pcmcia(5), ifconfig(8), insmod(1), iwconfig(8), iwspy(8), iwpriv(8).
MIT Lab. for Comp. Sci. 4/16/95 WAVELAN_CS(4)