| /* nicstar.c v0.22 Jawaid Bazyar (bazyar@hypermall.com) | |
| * nicstar.c, M. Welsh (matt.welsh@cl.cam.ac.uk) | |
| * | |
| * Hacked October, 1997 by Jawaid Bazyar, Interlink Advertising Services Inc. | |
| * http://www.hypermall.com/ | |
| * 10/1/97 - commented out CFG_PHYIE bit - we don't care when the PHY | |
| * interrupts us (except possibly for removal/insertion of the cable?) | |
| * 10/4/97 - began heavy inline documentation of the code. Corrected typos | |
| * and spelling mistakes. | |
| * 10/5/97 - added code to handle PHY interrupts, disable PHY on | |
| * loss of link, and correctly re-enable PHY when link is | |
| * re-established. (put back CFG_PHYIE) | |
| * | |
| * Modified to work with the IDT7721 nicstar -- AAL5 (tested) only. | |
| * | |
| * R. D. Rechenmacher <ron@fnal.gov>, Aug. 6, 1997 | |
| * | |
| * Linux driver for the IDT77201 NICStAR PCI ATM controller. | |
| * PHY component is expected to be 155 Mbps S/UNI-Lite or IDT 77155; | |
| * see init_nicstar() for PHY initialization to change this. This driver | |
| * expects the Linux ATM stack to support scatter-gather lists | |
| * (skb->atm.iovcnt != 0) for Rx skb's passed to vcc->push. | |
| * | |
| * Implementing minimal-copy of received data: | |
| * IDT always receives data into a small buffer, then large buffers | |
| * as needed. This means that data must always be copied to create | |
| * the linear buffer needed by most non-ATM protocol stacks (e.g. IP) | |
| * Fix is simple: make large buffers large enough to hold entire | |
| * SDU, and leave <small_buffer_data> bytes empty at the start. Then | |
| * copy small buffer contents to head of large buffer. | |
| * Trick is to avoid fragmenting Linux, due to need for a lot of large | |
| * buffers. This is done by 2 things: | |
| * 1) skb->destructor / skb->atm.recycle_buffer | |
| * combined, allow nicstar_free_rx_skb to be called to | |
| * recycle large data buffers | |
| * 2) skb_clone of received buffers | |
| * See nicstar_free_rx_skb and linearize_buffer for implementation | |
| * details. | |
| * | |
| * | |
| * | |
| * Copyright (c) 1996 University of Cambridge Computer Laboratory | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation; either version 2 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program; if not, write to the Free Software | |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| * | |
| * M. Welsh, 6 July 1996 | |
| * | |
| * | |
| */ |