linux/drivers/atm/nicstarmac.copyright
<<
>>
Prefs
   1/* nicstar.c  v0.22  Jawaid Bazyar (bazyar@hypermall.com)
   2 * nicstar.c, M. Welsh (matt.welsh@cl.cam.ac.uk)
   3 *
   4 * Hacked October, 1997 by Jawaid Bazyar, Interlink Advertising Services Inc.
   5 *      http://www.hypermall.com/
   6 * 10/1/97 - commented out CFG_PHYIE bit - we don't care when the PHY
   7 *      interrupts us (except possibly for removal/insertion of the cable?)
   8 * 10/4/97 - began heavy inline documentation of the code. Corrected typos
   9 *      and spelling mistakes.
  10 * 10/5/97 - added code to handle PHY interrupts, disable PHY on
  11 *      loss of link, and correctly re-enable PHY when link is
  12 *      re-established. (put back CFG_PHYIE)
  13 *
  14 *   Modified to work with the IDT7721 nicstar -- AAL5 (tested) only.
  15 *
  16 * R. D. Rechenmacher <ron@fnal.gov>, Aug. 6, 1997
  17 *
  18 * Linux driver for the IDT77201 NICStAR PCI ATM controller.
  19 * PHY component is expected to be 155 Mbps S/UNI-Lite or IDT 77155;
  20 * see init_nicstar() for PHY initialization to change this. This driver
  21 * expects the Linux ATM stack to support scatter-gather lists 
  22 * (skb->atm.iovcnt != 0) for Rx skb's passed to vcc->push.
  23 *
  24 * Implementing minimal-copy of received data:
  25 *   IDT always receives data into a small buffer, then large buffers
  26 *     as needed. This means that data must always be copied to create
  27 *     the linear buffer needed by most non-ATM protocol stacks (e.g. IP)
  28 *     Fix is simple: make large buffers large enough to hold entire
  29 *     SDU, and leave <small_buffer_data> bytes empty at the start. Then
  30 *     copy small buffer contents to head of large buffer.
  31 *   Trick is to avoid fragmenting Linux, due to need for a lot of large
  32 *     buffers. This is done by 2 things:
  33 *       1) skb->destructor / skb->atm.recycle_buffer
  34 *            combined, allow nicstar_free_rx_skb to be called to
  35 *            recycle large data buffers
  36 *       2) skb_clone of received buffers
  37 *   See nicstar_free_rx_skb and linearize_buffer for implementation
  38 *     details.
  39 *
  40 *
  41 *
  42 * Copyright (c) 1996 University of Cambridge Computer Laboratory
  43 *
  44 *   This program is free software; you can redistribute it and/or modify
  45 *   it under the terms of the GNU General Public License as published by
  46 *   the Free Software Foundation; either version 2 of the License, or
  47 *   (at your option) any later version.
  48 * 
  49 *   This program is distributed in the hope that it will be useful,
  50 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  51 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  52 *   GNU General Public License for more details.
  53 *
  54 *   You should have received a copy of the GNU General Public License
  55 *   along with this program; if not, write to the Free Software
  56 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  57 *
  58 * M. Welsh, 6 July 1996
  59 *
  60 *
  61 */
  62
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.