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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/atm/nicstarmac.copyright
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/* 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 $Revision: 1.1 $ $Date: 1999/08/20 11:00:11 $
+ *
+ * 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
+ *
+ *
+ */