readme

COPE the first practical network coding scheme which is developped on click

Three keywords are used to control the speed and duplex configuration. These 
keywords are Speed, Duplex, and AutoNeg.

If the board uses a fiber interface, these keywords are ignored, and the 
fiber interface board only links at 1000 Mbps full-duplex.

For copper-based boards, the keywords interact as follows:

  The default operation is auto-negotiate. The board advertises all supported
  speed and duplex combinations, and it links at the highest common speed and
  duplex mode IF the link partner is set to auto-negotiate.

  If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps is
  advertised (The 1000BaseT spec requires auto-negotiation.)

  If Speed = 10 or 100, then both Speed and Duplex should be set. Auto-
  negotiation is disabled, and the AutoNeg parameter is ignored. Partner SHOULD
  also be forced.

The AutoNeg parameter is used when more control is required over the 
auto-negotiation process.  It should be used when you wish to control which speed 
and duplex combinations are advertised during the auto-negotiation process. 

The parameter may be specified as either a decimal or hexidecimal value as 
determined by the bitmap below.


Bit position   7      6      5       4       3      2      1       0
Decimal Value  128    64     32      16      8      4      2       1
Hex value      80     40     20      10      8      4      2       1
Speed (Mbps)   N/A    N/A    1000    N/A     100    100    10      10
Duplex                   Full      Full   Half   Full   Half


Some examples of using AutoNeg:

  modprobe e1000 AutoNeg=0x01 (Restricts autonegotiation to 10 Half)
  modprobe e1000 AutoNeg=1 (Same as above)
  modprobe e1000 AutoNeg=0x02 (Restricts autonegotiation to 10 Full)
  modprobe e1000 AutoNeg=0x03 (Restricts autonegotiation to 10 Half or 10 Full)
  modprobe e1000 AutoNeg=0x04 (Restricts autonegotiation to 100 Half)
  modprobe e1000 AutoNeg=0x05 (Restricts autonegotiation to 10 Half or 100 Half)
  modprobe e1000 AutoNeg=0x020 (Restricts autonegotiation to 1000 Full)
  modprobe e1000 AutoNeg=32 (Same as above)

Note that when this parameter is used, Speed and Duplex must not be specified.  

If the link partner is forced to a specific speed and duplex, then this parameter 
should not be used.  Instead, use the Speed and Duplex parameters previously 
mentioned to force the adapter to the same speed and duplex. 


Additional Configurations
=========================

  Configuring the Driver on Different Distributions
  -------------------------------------------------

  Configuring a network driver to load properly when the system is started is
  distribution dependent. Typically, the configuration process involves adding
  an alias line to /etc/modules.conf as well as editing other system startup 
  scripts and/or configuration files. Many popular Linux distributions ship 
  with tools to make these changes for you. To learn the proper way to 
  configure a network device for your system, refer to your distribution 
  documentation. If during this process you are asked for the driver or module 
  name, the name for the Linux Base Driver for the Intel PRO/1000 Family of 
  Adapters is e1000.

  As an example, if you install the e1000 driver for two PRO/1000 adapters 
  (eth0 and eth1) and set the speed and duplex to 10full and 100half, add the 
  following to modules.conf:

       alias eth0 e1000
       alias eth1 e1000
       options e1000 Speed=10,100 Duplex=2,1

  Viewing Link Messages
  ---------------------

  Link messages will not be displayed to the console if the distribution is 
  restricting system messages. In order to see network driver link messages on 
  your console, set dmesg to eight by entering the following:

       dmesg -n 8

  NOTE: This setting is not saved across reboots.

  Jumbo Frames
  ------------

  The driver supports Jumbo Frames for all adapters except 82542-based adapters. 
  Jumbo Frames support is enabled by changing the MTU to a value larger than 
  the default of 1500. Use the ifconfig command to increase the MTU size. For 
  example:

       ifconfig eth<x> mtu 9000 up

  NOTE: This setting is not saved across reboots. The setting change can be 
  made permanent by adding:

       MTU=9000

  to the file /etc/sysconfig/network-scripts/ifcfg-eth<x>, with Red Hat
  distributions, for example.  Other distributions may store this setting in a
  different location.

  The maximum MTU setting for Jumbo Frames is 16110. This value coincides with 
  the maximum Jumbo Frames size of 16128.

  NOTE: Jumbo Frames are supported at 1000 Mbps only. Using Jumbo Frames at 
  10 or 100 Mbps may result in poor performance or loss of link. 

  NOTE: MTU designates the frame size. To enable Jumbo Frames, increase the MTU 
  size on the interface beyond 1500.

  Ethtool
  -------

  The driver utilizes the ethtool interface for driver configuration and
  diagnostics, as well as displaying statistical information.  Ethtool
  version 1.6 or later is required for this functionality.

  The latest release of ethtool can be found from
  http://sf.net/projects/gkernel. 

  NOTE: Ethtool 1.6 only supports a limited set of ethtool options. Support 
  for a more complete ethtool feature set can be enabled by upgrading 
  ethtool to ethtool-1.8.1. 

  Enabling Wake on LAN* (WoL)
  ---------------------------

  WoL is configured through the Ethtool* utility. Ethtool is included with
  all versions of Red Hat after Red Hat 7.2. For other Linux distributions, 
  download and install Ethtool from the following website: 
  http://sourceforge.net/projects/gkernel.

  For instructions on enabling WoL with Ethtool, refer to the website listed 
  above.

  WoL will be enabled on the system during the next shut down or reboot. 
  For this driver version, in order to enable WoL, the e1000 driver must be 
  loaded when shutting down or rebooting the system.

  NAPI
  ----

  NAPI (Rx polling mode) is supported in the e1000 driver. NAPI is enabled
  or disabled based on the configuration of the kernel. To override
  the default, use the following compile-time flags.

  To enable NAPI, compile the driver module, passing in a configuration option:

       make CFLAGS_EXTRA=-DE1000_NAPI install

  To disable NAPI, compile the driver module, passing in a configuration option:

       make CFLAGS_EXTRA=-DE1000_NO_NAPI install

  See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.

Known Issues
============

NOTE: For distribution-specific information, see the ldistrib.txt file 
      included in the driver tar.

  Driver Compilation
  ------------------

  When trying to compile the driver by running make install, the following
  error may occur: 

      "Linux kernel source not configured - missing version.h"

  To solve this issue, create the version.h file by going to the Linux source 
  tree and entering:

      make include/linux/version.h.

  Jumbo Frames System Requirement
  -------------------------------

  Memory allocation failures have been observed on Linux systems with 64 MB 
  of RAM or less that are running Jumbo Frames. If you are using Jumbo 
  Frames, your system may require more than the advertised minimum 
  requirement of 64 MB of system memory.

  Performance Degradation with Jumbo Frames
  -----------------------------------------

  Degradation in throughput performance may be observed in some Jumbo frames 
  environments. If this is observed, increasing the application's socket buffer 
  size and/or increasing the /proc/sys/net/ipv4/tcp_*mem entry values may help. 
  See the specific application manual and /usr/src/linux*/Documentation/
  networking/ip-sysctl.txt for more details.

  Jumbo frames on Foundry BigIron 8000 switch
  -------------------------------------------
  There is a known issue using Jumbo frames when connected to a Foundry BigIron 
  8000 switch. This is a 3rd party limitation. If you experience loss of 
  packets, lower the MTU size.

  Multiple Interfaces on Same Ethernet Broadcast Network
  ------------------------------------------------------

  Due to the default ARP behavior on Linux, it is not possible to have 
  one system on two IP networks in the same Ethernet broadcast domain 
  (non-partitioned switch) behave as expected. All Ethernet interfaces 
  will respond to IP traffic for any IP address assigned to the system.
  This results in unbalanced receive traffic.

  If you have multiple interfaces in a server, either turn on ARP 
  filtering by entering:

      echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
  (this only works if your kernel's version is higher than 2.4.5), 

  NOTE: This setting is not saved across reboots. The configuration change 
  can be made permanent by adding the line:
      net.ipv4.conf.all.arp_filter = 1
  to the file /etc/sysctl.conf 

        or,

  install the interfaces in separate broadcast domains (either in different 
  switches or in a switch partitioned to VLANs).

  82541/82547 can't link or are slow to link with some link partners
  -----------------------------------------------------------------

  There is a known compatibility issue with 82541/82547 and some 
  low-end switches where the link will not be established, or will 
  be slow to establish.  In particular, these switches are known to 
  be incompatible with 82541/82547:

      Planex FXG-08TE
      I-O Data ETG-SH8

  To workaround this issue, the driver can be compiled with an override
  of the PHY's master/slave setting.  Forcing master or forcing slave 
  mode will improve time-to-link.

      # make CFLAGS_EXTRA=-DE1000_MASTER_SLAVE=<n>

  Where <n> is:

      0 = Hardware default
      1 = Master mode
      2 = Slave mode
      3 = Auto master/slave

  Disable rx flow control with ethtool  
  ------------------------------------

  In order to disable receive flow control using ethtool on the following 
  adapters, you must turn off auto-negotiation on the same command line. 

  For example:

     ethtool -A eth? autoneg off rx off


Support
=======

For general information, go to the Intel support website at:

    http://support.intel.com

If an issue is identified with the released source code on the supported
kernel with a supported adapter, email the specific information related to 
the issue to [e-mail].

License
=======

This software program is released under the terms of a license agreement 
between you ('Licensee') and Intel. Do not use or load this software or any 
associated materials (collectively, the 'Software') until you have carefully 
read the full terms and conditions of the LICENSE located in this software 
package. By loading or using the Software, you agree to the terms of this 
Agreement. If you do not agree with the terms of this Agreement, do not 
install or use the Software.

* Other names and brands may be claimed as the property of others.