diff options
Diffstat (limited to 'drivers/atm/nicstarmac.copyright')
| -rw-r--r-- | drivers/atm/nicstarmac.copyright | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/atm/nicstarmac.copyright b/drivers/atm/nicstarmac.copyright new file mode 100644 index 0000000000..180531a83c --- /dev/null +++ b/drivers/atm/nicstarmac.copyright @@ -0,0 +1,61 @@ +/* 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 + * + * + */ |