328 строки
12 KiB
XML
328 строки
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
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<book id="TulipUserGuide">
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<bookinfo>
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<title>Tulip Driver User's Guide</title>
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<authorgroup>
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<author>
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<firstname>Jeff</firstname>
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<surname>Garzik</surname>
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<affiliation>
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<address>
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<email>jgarzik@pobox.com</email>
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</address>
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</affiliation>
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</author>
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</authorgroup>
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<copyright>
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<year>2001</year>
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<holder>Jeff Garzik</holder>
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</copyright>
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<legalnotice>
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<para>
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This documentation is free software; you can redistribute
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it and/or modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later
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version.
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</para>
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<para>
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This program is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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</para>
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<para>
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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</para>
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<para>
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For more details see the file COPYING in the source
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distribution of Linux.
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</para>
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</legalnotice>
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</bookinfo>
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<toc></toc>
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<chapter id="intro">
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<title>Introduction</title>
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<para>
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The Tulip Ethernet Card Driver
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is maintained by Jeff Garzik (<email>jgarzik@pobox.com</email>).
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</para>
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<para>
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The Tulip driver was developed by Donald Becker and changed by
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Jeff Garzik, Takashi Manabe and a cast of thousands.
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</para>
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<para>
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For 2.4.x and later kernels, the Linux Tulip driver is available at
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<ulink url="http://sourceforge.net/projects/tulip/">http://sourceforge.net/projects/tulip/</ulink>
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</para>
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<para>
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This driver is for the Digital "Tulip" Ethernet adapter interface.
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It should work with most DEC 21*4*-based chips/ethercards, as well as
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with work-alike chips from Lite-On (PNIC) and Macronix (MXIC) and ASIX.
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</para>
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<para>
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The original author may be reached as becker@scyld.com, or C/O
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Scyld Computing Corporation,
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410 Severn Ave., Suite 210,
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Annapolis MD 21403
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</para>
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<para>
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Additional information on Donald Becker's tulip.c
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is available at <ulink url="http://www.scyld.com/network/tulip.html">http://www.scyld.com/network/tulip.html</ulink>
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</para>
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</chapter>
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<chapter id="drvr-compat">
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<title>Driver Compatibility</title>
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<para>
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This device driver is designed for the DECchip "Tulip", Digital's
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single-chip ethernet controllers for PCI (now owned by Intel).
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Supported members of the family
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are the 21040, 21041, 21140, 21140A, 21142, and 21143. Similar work-alike
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chips from Lite-On, Macronics, ASIX, Compex and other listed below are also
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supported.
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</para>
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<para>
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These chips are used on at least 140 unique PCI board designs. The great
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number of chips and board designs supported is the reason for the
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driver size and complexity. Almost of the increasing complexity is in the
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board configuration and media selection code. There is very little
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increasing in the operational critical path length.
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</para>
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</chapter>
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<chapter id="board-settings">
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<title>Board-specific Settings</title>
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<para>
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PCI bus devices are configured by the system at boot time, so no jumpers
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need to be set on the board. The system BIOS preferably should assign the
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PCI INTA signal to an otherwise unused system IRQ line.
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</para>
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<para>
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Some boards have EEPROMs tables with default media entry. The factory default
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is usually "autoselect". This should only be overridden when using
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transceiver connections without link beat e.g. 10base2 or AUI, or (rarely!)
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for forcing full-duplex when used with old link partners that do not do
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autonegotiation.
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</para>
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</chapter>
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<chapter id="driver-operation">
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<title>Driver Operation</title>
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<sect1><title>Ring buffers</title>
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<para>
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The Tulip can use either ring buffers or lists of Tx and Rx descriptors.
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This driver uses statically allocated rings of Rx and Tx descriptors, set at
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compile time by RX/TX_RING_SIZE. This version of the driver allocates skbuffs
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for the Rx ring buffers at open() time and passes the skb->data field to the
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Tulip as receive data buffers. When an incoming frame is less than
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RX_COPYBREAK bytes long, a fresh skbuff is allocated and the frame is
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copied to the new skbuff. When the incoming frame is larger, the skbuff is
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passed directly up the protocol stack and replaced by a newly allocated
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skbuff.
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</para>
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<para>
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The RX_COPYBREAK value is chosen to trade-off the memory wasted by
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using a full-sized skbuff for small frames vs. the copying costs of larger
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frames. For small frames the copying cost is negligible (esp. considering
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that we are pre-loading the cache with immediately useful header
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information). For large frames the copying cost is non-trivial, and the
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larger copy might flush the cache of useful data. A subtle aspect of this
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choice is that the Tulip only receives into longword aligned buffers, thus
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the IP header at offset 14 isn't longword aligned for further processing.
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Copied frames are put into the new skbuff at an offset of "+2", thus copying
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has the beneficial effect of aligning the IP header and preloading the
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cache.
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</para>
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</sect1>
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<sect1><title>Synchronization</title>
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<para>
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The driver runs as two independent, single-threaded flows of control. One
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is the send-packet routine, which enforces single-threaded use by the
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dev->tbusy flag. The other thread is the interrupt handler, which is single
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threaded by the hardware and other software.
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</para>
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<para>
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The send packet thread has partial control over the Tx ring and 'dev->tbusy'
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flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next
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queue slot is empty, it clears the tbusy flag when finished otherwise it sets
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the 'tp->tx_full' flag.
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</para>
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<para>
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The interrupt handler has exclusive control over the Rx ring and records stats
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from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so
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we can't avoid the interrupt overhead by having the Tx routine reap the Tx
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stats.) After reaping the stats, it marks the queue entry as empty by setting
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the 'base' to zero. Iff the 'tp->tx_full' flag is set, it clears both the
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tx_full and tbusy flags.
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</para>
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</sect1>
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</chapter>
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<chapter id="errata">
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<title>Errata</title>
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<para>
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The old DEC databooks were light on details.
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The 21040 databook claims that CSR13, CSR14, and CSR15 should each be the last
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register of the set CSR12-15 written. Hmmm, now how is that possible?
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</para>
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<para>
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The DEC SROM format is very badly designed not precisely defined, leading to
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part of the media selection junkheap below. Some boards do not have EEPROM
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media tables and need to be patched up. Worse, other boards use the DEC
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design kit media table when it isn't correct for their board.
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</para>
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<para>
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We cannot use MII interrupts because there is no defined GPIO pin to attach
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them. The MII transceiver status is polled using an kernel timer.
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</para>
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</chapter>
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<chapter id="changelog">
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<title>Driver Change History</title>
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<sect1><title>Version 0.9.14 (February 20, 2001)</title>
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<itemizedlist>
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<listitem><para>Fix PNIC problems (Manfred Spraul)</para></listitem>
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<listitem><para>Add new PCI id for Accton comet</para></listitem>
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<listitem><para>Support Davicom tulips</para></listitem>
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<listitem><para>Fix oops in eeprom parsing</para></listitem>
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<listitem><para>Enable workarounds for early PCI chipsets</para></listitem>
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<listitem><para>IA64, hppa csr0 support</para></listitem>
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<listitem><para>Support media types 5, 6</para></listitem>
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<listitem><para>Interpret a bit more of the 21142 SROM extended media type 3</para></listitem>
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<listitem><para>Add missing delay in eeprom reading</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.11 (November 3, 2000)</title>
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<itemizedlist>
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<listitem><para>Eliminate extra bus accesses when sharing interrupts (prumpf)</para></listitem>
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<listitem><para>Barrier following ownership descriptor bit flip (prumpf)</para></listitem>
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<listitem><para>Endianness fixes for >14 addresses in setup frames (prumpf)</para></listitem>
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<listitem><para>Report link beat to kernel/userspace via netif_carrier_*. (kuznet)</para></listitem>
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<listitem><para>Better spinlocking in set_rx_mode.</para></listitem>
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<listitem><para>Fix I/O resource request failure error messages (DaveM catch)</para></listitem>
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<listitem><para>Handle DMA allocation failure.</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.10 (September 6, 2000)</title>
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<itemizedlist>
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<listitem><para>Simple interrupt mitigation (via jamal)</para></listitem>
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<listitem><para>More PCI ids</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.9 (August 11, 2000)</title>
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<itemizedlist>
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<listitem><para>More PCI ids</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.8 (July 13, 2000)</title>
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<itemizedlist>
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<listitem><para>Correct signed/unsigned comparison for dummy frame index</para></listitem>
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<listitem><para>Remove outdated references to struct enet_statistics</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.7 (June 17, 2000)</title>
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<itemizedlist>
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<listitem><para>Timer cleanups (Andrew Morton)</para></listitem>
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<listitem><para>Alpha compile fix (somebody?)</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.6 (May 31, 2000)</title>
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<itemizedlist>
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<listitem><para>Revert 21143-related support flag patch</para></listitem>
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<listitem><para>Add HPPA/media-table debugging printk</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.5 (May 30, 2000)</title>
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<itemizedlist>
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<listitem><para>HPPA support (willy@puffingroup)</para></listitem>
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<listitem><para>CSR6 bits and tulip.h cleanup (Chris Smith)</para></listitem>
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<listitem><para>Improve debugging messages a bit</para></listitem>
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<listitem><para>Add delay after CSR13 write in t21142_start_nway</para></listitem>
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<listitem><para>Remove unused ETHER_STATS code</para></listitem>
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<listitem><para>Convert 'extern inline' to 'static inline' in tulip.h (Chris Smith)</para></listitem>
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<listitem><para>Update DS21143 support flags in tulip_chip_info[]</para></listitem>
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<listitem><para>Use spin_lock_irq, not _irqsave/restore, in tulip_start_xmit()</para></listitem>
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<listitem><para>Add locking to set_rx_mode()</para></listitem>
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<listitem><para>Fix race with chip setting DescOwned bit (Hal Murray)</para></listitem>
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<listitem><para>Request 100% of PIO and MMIO resource space assigned to card</para></listitem>
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<listitem><para>Remove error message from pci_enable_device failure</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.4.3 (April 14, 2000)</title>
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<itemizedlist>
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<listitem><para>mod_timer fix (Hal Murray)</para></listitem>
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<listitem><para>PNIC2 resuscitation (Chris Smith)</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.4.2 (March 21, 2000)</title>
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<itemizedlist>
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<listitem><para>Fix 21041 CSR7, CSR13/14/15 handling</para></listitem>
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<listitem><para>Merge some PCI ids from tulip 0.91x</para></listitem>
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<listitem><para>Merge some HAS_xxx flags and flag settings from tulip 0.91x</para></listitem>
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<listitem><para>asm/io.h fix (submitted by many) and cleanup</para></listitem>
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<listitem><para>s/HAS_NWAY143/HAS_NWAY/</para></listitem>
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<listitem><para>Cleanup 21041 mode reporting</para></listitem>
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<listitem><para>Small code cleanups</para></listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Version 0.9.4.1 (March 18, 2000)</title>
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<itemizedlist>
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<listitem><para>Finish PCI DMA conversion (davem)</para></listitem>
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<listitem><para>Do not netif_start_queue() at end of tulip_tx_timeout() (kuznet)</para></listitem>
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<listitem><para>PCI DMA fix (kuznet)</para></listitem>
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<listitem><para>eeprom.c code cleanup</para></listitem>
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<listitem><para>Remove Xircom Tulip crud</para></listitem>
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</itemizedlist>
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</sect1>
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</chapter>
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</book>
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