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Linux* Base Driver for the Intel(R) PRO/1000 Family of Adapters
===============================================================

June 27, 2006


Contents
========

- In This Release
- Identifying Your Adapter
- Building and Installation
- Command Line Parameters
- Speed and Duplex Configuration
- Additional Configurations
- Known Issues
- Support


In This Release
===============

This file describes the Linux* Base Driver for the Intel(R) PRO/1000 Family
of Adapters.  This driver supports kernel versions 2.4.x and 2.6.x.  This
driver includes support for Itanium(R)2-based systems.

This driver is only supported as a loadable module at this time.  Intel is
not supplying patches against the kernel source to allow for static linking
of the driver.  For questions related to hardware requirements, refer to the
documentation supplied with your Intel PRO/1000 adapter.  All hardware
requirements listed apply to use with Linux.

This release includes support for Intel(R) I/O Acceleration Technology,
Intel(R) I/OAT.  This is supported on systems using the Intel(R) 5000 Series
Chipsets Integrated Device - 1A38.  You can find additional information
on Intel I/OAT at http://www.intel.com/technology/ioacceleration/index.htm.

The following features are now available in supported kernels:
 - Native VLANs
 - Channel Bonding (teaming)
 - SNMP

Channel Bonding documentation can be found in the Linux kernel source:
/Documentation/networking/bonding.txt

The driver information previously displayed in the /proc filesystem is not
supported in this release.  Alternatively, you can use ethtool (version 1.6
or later), lspci, and ifconfig to obtain the same information.

Instructions on updating ethtool can be found in the section "Additional
Configurations" later in this document.

NOTE: The Intel(R) 82562v 10/100 Network Connection only provides 10/100
support.


Identifying Your Adapter
========================

For more information on how to identify your adapter, go to the Adapter &
Driver ID Guide at:

    http://support.intel.com/support/network/adapter/pro100/21397.htm

For the latest Intel network drivers for Linux, refer to the following
website.  In the search field, enter your adapter name or type, or use the
networking link on the left to search for your adapter:

    http://downloadfinder.intel.com/scripts-df/support_intel.asp


Building and Installation
=========================

To build a binary RPM* package of this driver, run 'rpmbuild -tb
<filename.tar.gz>'.  Replace <filename.tar.gz> with the specific filename
of the driver.

NOTE: For the build to work properly, the currently running kernel MUST
      match the version and configuration of the installed kernel sources.
      If you have just recompiled the kernel reboot the system now.

      RPM functionality has only been tested in Red Hat distributions.

1. Move the base driver tar file to the directory of your choice.  For
   example, use /home/username/e1000 or /usr/local/src/e1000.

2. Untar/unzip archive:

     tar zxf e1000-x.x.x.tar.gz

3. Change to the driver src directory:

     cd e1000-x.x.x/src/

4. Compile the driver module:

     make install

   The binary will be installed as:

     /lib/modules/<KERNEL VERSION>/kernel/drivers/net/e1000/e1000.[k]o

   The install locations listed above are the default locations.  They
   might not be correct for certain Linux distributions.  For more
   information, see the ldistrib.txt file included in the driver tar.

5. Load the module using either the insmod or modprobe command:

     modprobe e1000

     insmod e1000

   Note that for 2.6 kernels the insmod command can be used if the full
   path to the driver module is specified.  For example:

     insmod /lib/modules/<KERNEL VERSION>/kernel/drivers/net/e1000/e1000.ko

6. Assign an IP address to the interface by entering the following, where
   x is the interface number:

     ifconfig ethx <IP_address>

7. Verify that the interface works.  Enter the following, where <IP_address>
   is the IP address for another machine on the same subnet as the
   interface that is being tested:

     ping  <IP_address>	


Command Line Parameters
=======================

If the driver is built as a module, the  following optional parameters
are used by entering them on the command line with the modprobe command
using this syntax:

     modprobe e1000 [<option>=<VAL1>,<VAL2>,...]

For example, with two PRO/1000 PCI adapters, entering:

     modprobe e1000 TxDescriptors=80,128

loads the e1000 driver with 80 TX descriptors for the first adapter and
128 TX descriptors for the second adapter.

The default value for each parameter is generally the recommended setting,
unless otherwise noted.

NOTES:  For more information about the AutoNeg, Duplex, and Speed
        parameters, see the "Speed and Duplex Configuration" section in
        this document.

        For more information about the InterruptThrottleRate,
        RxIntDelay, TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay
        parameters, see the application note at:
        http://www.intel.com/design/network/applnots/ap450.htm

        A descriptor describes a data buffer and attributes related to
        the data buffer.  This information is accessed by the hardware.


AutoNeg
-------
(Supported only on adapters with copper connections)
Valid Range:   0x01-0x0F, 0x20-0x2F
Default Value: 0x2F

This parameter is a bit-mask that specifies the speed and duplex settings
advertised by the adapter.  When this parameter is used, the Speed and
Duplex parameters must not be specified.

NOTE:  Refer to the Speed and Duplex section of this readme for more
       information on the AutoNeg parameter.


Duplex
------
(Supported only on adapters with copper connections)
Valid Range:   0-2 (0=auto-negotiate, 1=half, 2=full)
Default Value: 0

This defines the direction in which data is allowed to flow.  Can be
either one or two-directional.  If both Duplex and the link partner are
set to auto-negotiate, the board auto-detects the correct duplex.  If the
link partner is forced (either full or half), Duplex defaults to half-
duplex.


FlowControl
----------
Valid Range:   0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx)
Default Value: Reads flow control settings from the EEPROM

This parameter controls the automatic generation(Tx) and response(Rx)
to Ethernet PAUSE frames.


InterruptThrottleRate
---------------------
(not supported on Intel(R) 82542, 82543 or 82544-based adapters)
Valid Range:   100-100000 (0=off, 1=dynamic)
Default Value: 8000

This value represents the maximum number of interrupts per second the
controller generates.  InterruptThrottleRate is another setting used in
interrupt moderation.  Dynamic mode uses a heuristic algorithm to adjust
InterruptThrottleRate based on the current traffic load.

The default setting is configured to optimize interrupts for bulk 
throughput while keeping CPU utilization low.  However this setting may 
result in slower overall transfer speeds if network traffic consists 
mostly of small packets.  If this is the case, reduce this value or set 
it to 0. 

NOTE:  InterruptThrottleRate takes precedence over the TxAbsIntDelay and
       RxAbsIntDelay parameters.  In other words, minimizing the receive
       and/or transmit absolute delays does not force the controller to
       generate more interrupts than what the Interrupt Throttle Rate
       allows.

CAUTION:  If you are using the Intel(R) PRO/1000 CT Network Connection
          (controller 82547), setting InterruptThrottleRate to a value
          greater than 75,000, may hang (stop transmitting) adapters
          under certain network conditions.  If this occurs a NETDEV
          WATCHDOG message is logged in the system event log.  In
          addition, the controller is automatically reset, restoring
          the network connection.  To eliminate the potential for the
          hang, ensure that InterruptThrottleRate is set no greater
          than 75,000 and is not set to 0.

NOTE:  When e1000 is loaded with default settings and multiple adapters
       are in use simultaneously, the CPU utilization may increase non-
       linearly.  In order to limit the CPU utilization without impacting
       the overall throughput, we recommend that you load the driver as
       follows:

           modprobe e1000 InterruptThrottleRate=3000,3000,3000

       This sets the InterruptThrottleRate to 3000 interrupts/sec for
       the first, second, and third instances of the driver.  The range
       of 2000 to 3000 interrupts per second works on a majority of
       systems and is a good starting point, but the optimal value will
       be platform-specific.  If CPU utilization is not a concern, use
       RX_POLLING (NAPI) and default driver settings.


RxDescriptors
-------------
Valid Range:   80-256 for 82542 and 82543-based adapters
               80-4096 for all other supported adapters
Default Value: 256

This value specifies the number of receive buffer descriptors allocated
by the driver.  Increasing this value allows the driver to buffer more
incoming packets, at the expense of increased system memory utilization.

Each descriptor is 16 bytes.  A receive buffer is also allocated for each
descriptor and can be either 2048, 4096, 8192, or 16384 bytes, depending 
on the MTU setting. The maximum MTU size is 16110.

NOTE:  MTU designates the frame size.  It only needs to be set for Jumbo 
       Frames.  Depending on the available system resources, the request 
       for a higher number of receive descriptors may be denied.  In this 
       case, use a lower number.


RxIntDelay
----------
Valid Range:   0-65535 (0=off)
Default Value: 0

This value delays the generation of receive interrupts in units of 1.024
microseconds.  Receive interrupt reduction can improve CPU efficiency if
properly tuned for specific network traffic.  Increasing this value adds
extra latency to frame reception and can end up decreasing the throughput
of TCP traffic.  If the system is reporting dropped receives, this value
may be set too high, causing the driver to run out of available receive
descriptors.

CAUTION:  When setting RxIntDelay to a value other than 0, adapters may
          hang (stop transmitting) under certain network conditions.  If
          this occurs a NETDEV WATCHDOG message is logged in the system
          event log.  In addition, the controller is automatically reset,
          restoring the network connection.  To eliminate the potential
          for the hang ensure that RxIntDelay is set to 0.


RxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range:   0-65535 (0=off)
Default Value: 128

This value, in units of 1.024 microseconds, limits the delay in which a
receive interrupt is generated.  Useful only if RxIntDelay is non-zero,
this value ensures that an interrupt is generated after the initial
packet is received within the set amount of time.  Proper tuning,
along with RxIntDelay, may improve traffic throughput in specific network
conditions.


Speed
-----
(This parameter is supported only on adapters with copper connections.)
Valid Settings: 0, 10, 100, 1000
Default Value:  0 (auto-negotiate at all supported speeds)

Speed forces the line speed to the specified value in megabits per second
(Mbps).  If this parameter is not specified or is set to 0 and the link
partner is set to auto-negotiate, the board will auto-detect the correct
speed.  Duplex should also be set when Speed is set to either 10 or 100.


TxDescriptors
-------------
Valid Range:   80-256 for 82542 and 82543-based adapters
               80-4096 for all other supported adapters
Default Value: 256

This value is the number of transmit descriptors allocated by the driver.
Increasing this value allows the driver to queue more transmits.  Each
descriptor is 16 bytes.

NOTE:  Depending on the available system resources, the request for a
       higher number of transmit descriptors may be denied.  In this case,
       use a lower number.


TxIntDelay
----------
Valid Range:   0-65535 (0=off)
Default Value: 64

This value delays the generation of transmit interrupts in units of
1.024 microseconds.  Transmit interrupt reduction can improve CPU
efficiency if properly tuned for specific network traffic.  If the
system is reporting dropped transmits, this value may be set too high
causing the driver to run out of available transmit descriptors.


TxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range:   0-65535 (0=off)
Default Value: 64

This value, in units of 1.024 microseconds, limits the delay in which a
transmit interrupt is generated.  Useful only if TxIntDelay is non-zero,
this value ensures that an interrupt is generated after the initial
packet is sent on the wire within the set amount of time.  Proper tuning,
along with TxIntDelay, may improve traffic throughput in specific
network conditions.

XsumRX
------