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]

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 disables 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 efficient but can consume a significant amount of PCI bus bandwidth.

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).