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

August 29, 2005


Contents
========

- Overview
- Identifying Your Adapter
- Building and Installation
- Speed and Duplex Configuration
- Additional Configurations
- Known Limitations
- Support
- License


Overview
========

This file describes the FreeBSD* driver for the Intel® PRO/1000 Family of 
Adapters. This driver has been developed for use with FreeBSD, Release 4.10 
and greater and Release 5.4.

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 FreeBSD.


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

For 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 FreeBSD, see: 

http://downloadfinder.intel.com/scripts-df-external/support_intel.aspx 


NOTE: Mobile adapters are not fully supported.


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

NOTE: The driver can be installed as a dynamic loadable kernel module or 
      compiled into the kernel. You must have kernel sources installed in 
      order to compile the driver module.

In the instructions below, x.x.x is the driver version as indicated in the 
name of the driver tar file.

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

2. Untar/unzip the archive:

        tar xvfz em-x.x.x.tar.gz

   This will create an em-x.x.x directory.

3. To create a loadable module, perform the following steps. 
   NOTE: To compile the driver into the kernel, go directly to step 4.

	a. To compile the module

	          cd em-x.x.x
      	          make

   	b. To install the compiled module in system directory:
	 
		  make install
		
   	c. If you want the driver to load automatically when the system is booted:

	      1. Edit /boot/loader.conf, and add the following line:

      	          if_em_load="YES"

4. To compile the driver into the kernel:

        cd em-x.x.x/src

        cp if_em* /usr/src/sys/dev/em

        cp Makefile.kernel /usr/src/sys/modules/em/Makefile

   Edit the /usr/src/sys/conf/files.i386 file, and add the following lines only if 
   they don't already exist:

        dev/em/if_em.c optional em 

        dev/em/if_em_hw.c optional em 

   Remove the following lines from the /usr/src/sys/conf/files.i386 file, 
   if they exist:

        dev/em/if_em_fxhw.c optional em
        dev/em/if_em_phy.c optional em

   Edit the kernel configuration file (i.e., GENERIC or MYKERNEL) in 
   /usr/src/sys/i386/conf, and ensure the following line is present:

        device em

   Compile and install the kernel. The system must be rebooted for the kernel
   updates to take effect. For additional information on compiling the 
   kernel, consult the FreeBSD operating system documentation.

5. To assign an IP address to the interface, enter the following:

        ifconfig em<interface_num> <IP_address>

6. 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>

7. To configure the IP address to remain after reboot, edit /etc/rc.conf, 
   and create the appropriate ifconfig_em<interface_num> entry:

        ifconfig_em<interface_num>="<ifconfig_settings>"

   Example usage:

        ifconfig_em0="inet 192.168.10.1 netmask 255.255.255.0"

   NOTE: For assistance, see the ifconfig man page.


Speed and Duplex Configuration
==============================

By default, the adapter auto-negotiates the speed and duplex of the 
connection. If there is a specific need, the ifconfig utility can be used to 
configure the speed and duplex settings on the adapter. Example usage:

        ifconfig em<interface_num> <IP_address> media 100baseTX mediaopt 
            full-duplex

   NOTE: Only use mediaopt to set the driver to full-duplex. If mediaopt is 
         not specified and you are not running at gigabit speed, the driver 
         defaults to half-duplex.


This driver supports the following media type options:

   autoselect      -  Enables auto-negotiation for speed and duplex.

   10baseT/UTP     -  Sets speed to 10 Mbps. Use the ifconfig mediaopt 
                      option to select full-duplex mode.

   100baseTX       -  Sets speed to 100 Mbps. Use the ifconfig mediaopt
                      option to select full-duplex mode.

   1000baseTX      -  Sets speed to 1000 Mbps. In this case, the driver
                      supports only full-duplex mode.

   1000baseSX      -  Sets speed to 1000 Mbps. In this case, the driver
                      supports only full-duplex mode.

For more information on the ifconfig utility, see the ifconfig man page.


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

The driver supports Transmit/Receive Checksum Offload and Jumbo Frames on 
all but the 82542-based adapters. For specific adapters, refer to the 
Identifying Your Adapter section.

  Jumbo Frames
  ------------
  To enable Jumbo Frames, use the ifconfig utility to set the Maximum 
  Transport Unit (MTU) frame size above its default of 1500 bytes. 

  The Jumbo Frames MTU range for Intel Adapters is 1500 to 16110. To modify 
  the setting, enter the following:

        ifconfig em<interface_num> <hostname or IP address> mtu 9000

  To confirm the MTU used between two specific devices, use:

        route get <destination_IP_address>

  Notes: 

  - Only enable Jumbo Frames if your network infrastructure supports them.

  - The Jumbo Frames setting on the switch must be set to at least 22 bytes 
    larger than that of the MTU.

  - The maximum MTU setting is 16110, with a corresponding maximum Jumbo 
    Frames size of 16128. 

  - Some Intel gigabit adapters that support Jumbo Frames have a frame size limit 
    of 9238 bytes, with a corresponding MTU size limit of 9216 bytes. The adapters 
    with this limitation are based on the Intel 82571EB and 82572EI controllers, 
    which correspond to these product names: 
     Intel® PRO/1000 PT Dual Port Server Adapter
     Intel® PRO/1000 PF Dual Port Server Adapter
     Intel® PRO/1000 PT Server Adapter 
     Intel® PRO/1000 PT Desktop Adapter 
     Intel® PRO/1000 PF Server Adapter
 
  - Using Jumbo Frames at 10 or 100 Mbps may result in poor performance or loss 
    of link.

  - The Intel PRO/1000 PM Network Connection does not support jumbo frames.


  VLANs
  -----
  To create a new VLAN interface:

        ifconfig <vlan_name> create

  To associate the VLAN interface with a physical interface and 
  assign a VLAN ID, IP address, and netmask:

        ifconfig <vlan_name> <ip_address> netmask <subnet_mask> vlan 
           <vlan_id> vlandev <physical_interface>

  Example:

        ifconfig vlan10 10.0.0.1 netmask 255.255.255.0 vlan10 vlandev em0

  In this example, all packets will be marked on egress with  802.1Q VLAN 
  tags, specifying a VLAN ID of 10.

  To remove a VLAN interface:

        ifconfig <vlan_name> destroy

  Polling
  -------
  NOTES: DEVICE POLLING is only valid for non-SMP kernels.

        The driver has to be compiled into the kernel for DEVICE POLLING to be
        enabled in the driver.

  To enable polling in the driver, add the following options to the kernel 
  configuration, and then recompile the kernel:

        options DEVICE_POLLING
        options HZ=1000

  At runtime use: 
        sysctl kern.polling.enable=1 to turn polling on
  Use:   
	sysctl ker.polling.enable=0 to turn polling off

  Checksum Offload
  ----------------
  Checksum offloading is not supported on 82542 Gigabit adapters. 

  Checksum offloading supports both TCP and UDP packets and is 
  supported for both transmit and receive. 

  Checksum offloading can be enabled or disabled using ifconfig. 
  Both transmit and receive offloading will be either enabled or 
  disabled together. You cannot enable/disable one without the other.

  To enable checksum offloading:

         ifconfig <interface_num> rxcsum 

  To disable checksum offloading:

         ifconfig <interface_num> -rxcsum 

  To confirm the current setting:

         ifconfig <interface_num>

  Look for the presence or absence of the following line:

         options=3 <RXCSUM,TXCSUM>

  See the ifconfig man page for further information. 

Known Limitations
=================
 
  There are known performance issues with this driver when running UDP traffic
  with Jumbo Frames. 
 
  There is a known compatibility issue where time to link is slow or link is not 
  established between 82541/82547 controllers and some switches.  Known switches
  include:
        Planex FXG-08TE
        I-O Data ETG-SH8

  The driver can be compiled with the following changes:

  Edit ./em.x.x.x/src/if_em.h to uncomment the #define EM_MASTER_SLAVE 
  from within the comments.  For example, change from:

      /* #define EM_MASTER_SLAVE  2 */
  to:
      #define EM_MASTER_SLAVE  2 

  Use one of the following options:
      1 = Master mode
      2 = Slave mode
      3 = Auto master/slave
  Setting 2 is recommended.

  Recompile the module:
	  a. To compile the module
		cd em-x.x.x
          	make clean
          	make

   b. To install the compiled module in system directory:
 		make install


Support
=======

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

        http://support.intel.com

If an issue is identified, support is through email only at:
freebsdnic@mailbox.intel.com

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.

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