IDT(4) MidnightBSD Kernel Interfaces Manual IDT(4)

NAME

idt — device driver for IDT NICStAR-based ATM interfaces

SYNOPSIS

device idt
device atm

DESCRIPTION

The idt device driver supports ATM network interfaces based on the IDT NICStAR 77211 controller, including the FORE Systems ForeRunner LE25 and LE155. For configuring the card for IP see natmip(4).

ATM CBR connections are supported, and bandwidth is allocated in slots of 64k each. Three VBR queues handle traffic for VBR and UBR. Two UBR queues prioritize UBR traffic. ILMI and signalling get the higher priority queue, as well as UBR traffic that specifies a peak cell rate. All other UBR traffic goes into the lower queue.

The following sysctls are recognized by the driver:

hw.idt.log_bufstat

Print statistics about buffer use to the system log periodically.

hw.idt.log_vcs

Print information about VC opens, closes, and other events to the system log.

hw.idt.bufs_large

Set or print the maximum size of the 2KB buffer queue.

hw.idt.bufs_small

Set or print the maximum size of the mbuf queue.

hw.idt.cur_large

Print the current size of the 2KB buffer queue.

hw.idt.cur_small

Print the current size of the mbuf queue.

hw.idt.qptr_hold

Optimize the TX queue buffer for lowest overhead.

SEE ALSO

natm(4), natmip(4), ifconfig(8), route(8)

AUTHORS

Richard Hodges, based on the original driver for FreeBSD 2.2 by Mark Tinguely. Bruce M. Simpson wrote this manual page and backported the driver to FreeBSD 4.9.

MidnightBSD 0.3 June 3, 2003 MidnightBSD 0.3