freebsd/sys/dev/em

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

February 5, 2003


Contents
========

- Overview
- Supported Adapters
- Building and Installation
- Speed and Duplex Configuration
- Additional Configurations
- Known Limitations
- Support
- License


Overview
========

This file describes the FreeBSD* driver, version 1.5.x, for the Intel(R)
PRO/1000 Family of Adapters. This driver has been developed for use with 
FreeBSD, version 4.7. 

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.


Supported Adapters
==================

The following Intel network adapters are compatible with the drivers in this 
release:

   Controller  Adapter Name                         Board IDs
   ----------  ------------                         ---------

   82542       PRO/1000 Gigabit Server Adapter      700262-xxx, 717037-xxx

   82543       PRO/1000 F Server Adapter            738640-xxx, A38888-xxx,
                                                    A06512-xxx

   82543       PRO/1000 T Server Adapter            A19845-xxx, A33948-xxx

   82544       PRO/1000 XT Server Adapter           A51580-xxx

   82544       PRO/1000 XF Server Adapter           A50484-xxx

   82544       PRO/1000 T Desktop Adapter           A62947-xxx
 
   82540       PRO/1000 MT Desktop Adapter          A78408-xxx
   82541                                            C91016-xxx

   82545       PRO/1000 MT Server Adapter           A92165-xxx

   82545       PRO/1000 MF Server Adapter           A91622-xxx

   82545       PRO/1000 MF Server Adapter(LX)       A91624-xxx

   82546       PRO/1000 MT Dual Port Server Adapter A92111-xxx

   82546       PRO/1000 MF Dual Port Server Adapter A91620-xxx



To verify your Intel adapter is supported, find the board ID number on the
adapter. Look for a label that has a barcode and a number in the format of
123456-001 (six digits hyphen three digits). Match this to the list of 
numbers above.

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 FreeBSD, see:

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


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. Follow steps a, and b above to compile and install the module
	      2. 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 /usr/src/sys/modules/em

   Edit the /usr/src/sys/conf/files.i386 file, and add the following lines:

        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><3E>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 
Supported Adapters section.

  Jumbo Frames
  ------------
  To enable Jumbo Frames, use the ifconfig utility to increase the MTU 
  beyond 1500 bytes. 

  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 adapter.

  The Jumbo Frames MTU range for Intel Adapters is 1500 to 16114. The default 
  MTU range is 1500. To modify the setting, enter the following:

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

  To confirm an interface's MTU value, use the ifconfig command. To confirm
  the MTU used between two specific devices, use:

        route get <destination_IP_address>

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

        ifconfig <vlan_name> create

  To associate the VLAN pseudo-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 pseudo-interface:

        ifconfig <vlan_name> destroy

  Polling
  -------
  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 the following command to turn on polling mode. Similarly,
  turn off polling mode by setting the variable to 0:

        sysctl kern.polling.enable=1


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

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


Known Limitations
=================
 
There are known performance issues with this driver when running UDP traffic
with Jumbo Frames. Intel recommends not using Jumbo Frames for UDP traffic.


Support
=======

For general information and support, 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 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.

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