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Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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==============================================================
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Linux* Base Driver for the Intel(R) PRO/100 Family of Adapters
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==============================================================
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June 1, 2018
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Contents
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========
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- In This Release
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- Identifying Your Adapter
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- Building and Installation
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- Driver Configuration Parameters
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- Additional Configurations
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- Known Issues
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- Support
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In This Release
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===============
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This file describes the Linux* Base Driver for the Intel(R) PRO/100 Family of
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Adapters. This driver includes support for Itanium(R)2-based systems.
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For questions related to hardware requirements, refer to the documentation
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supplied with your Intel PRO/100 adapter.
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The following features are now available in supported kernels:
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- Native VLANs
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- Channel Bonding (teaming)
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- SNMP
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Channel Bonding documentation can be found in the Linux kernel source:
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/Documentation/networking/bonding.txt
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Identifying Your Adapter
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========================
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For information on how to identify your adapter, and for the latest Intel
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network drivers, refer to the Intel Support website:
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http://www.intel.com/support
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Driver Configuration Parameters
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===============================
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The default value for each parameter is generally the recommended setting,
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unless otherwise noted.
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Rx Descriptors:
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Number of receive descriptors. A receive descriptor is a data
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structure that describes a receive buffer and its attributes to the network
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controller. The data in the descriptor is used by the controller to write
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data from the controller to host memory. In the 3.x.x driver the valid range
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for this parameter is 64-256. The default value is 256. This parameter can be
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changed using the command::
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ethtool -G eth? rx n
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Where n is the number of desired Rx descriptors.
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Tx Descriptors:
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Number of transmit descriptors. A transmit descriptor is a data
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structure that describes a transmit buffer and its attributes to the network
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controller. The data in the descriptor is used by the controller to read
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data from the host memory to the controller. In the 3.x.x driver the valid
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range for this parameter is 64-256. The default value is 128. This parameter
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can be changed using the command::
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ethtool -G eth? tx n
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Where n is the number of desired Tx descriptors.
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Speed/Duplex:
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The driver auto-negotiates the link speed and duplex settings by
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default. The ethtool utility can be used as follows to force speed/duplex.::
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ethtool -s eth? autoneg off speed {10|100} duplex {full|half}
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NOTE: setting the speed/duplex to incorrect values will cause the link to
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fail.
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Event Log Message Level:
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The driver uses the message level flag to log events
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to syslog. The message level can be set at driver load time. It can also be
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set using the command::
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ethtool -s eth? msglvl n
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Additional Configurations
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=========================
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Configuring the Driver on Different Distributions
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-------------------------------------------------
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Configuring a network driver to load properly when the system is started
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is distribution dependent. Typically, the configuration process involves
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adding an alias line to `/etc/modprobe.d/*.conf` as well as editing other
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system startup scripts and/or configuration files. Many popular Linux
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distributions ship with tools to make these changes for you. To learn
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the proper way to configure a network device for your system, refer to
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your distribution documentation. If during this process you are asked
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for the driver or module name, the name for the Linux Base Driver for
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the Intel PRO/100 Family of Adapters is e100.
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As an example, if you install the e100 driver for two PRO/100 adapters
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(eth0 and eth1), add the following to a configuration file in
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/etc/modprobe.d/::
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alias eth0 e100
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alias eth1 e100
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Viewing Link Messages
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---------------------
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In order to see link messages and other Intel driver information on your
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console, you must set the dmesg level up to six. This can be done by
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entering the following on the command line before loading the e100
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driver::
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dmesg -n 6
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If you wish to see all messages issued by the driver, including debug
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messages, set the dmesg level to eight.
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NOTE: This setting is not saved across reboots.
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ethtool
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-------
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The driver utilizes the ethtool interface for driver configuration and
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diagnostics, as well as displaying statistical information. The ethtool
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version 1.6 or later is required for this functionality.
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The latest release of ethtool can be found from
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https://www.kernel.org/pub/software/network/ethtool/
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Enabling Wake on LAN* (WoL)
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---------------------------
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WoL is provided through the ethtool* utility. For instructions on
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enabling WoL with ethtool, refer to the ethtool man page. WoL will be
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enabled on the system during the next shut down or reboot. For this
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driver version, in order to enable WoL, the e100 driver must be loaded
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when shutting down or rebooting the system.
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NAPI
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----
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NAPI (Rx polling mode) is supported in the e100 driver.
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See https://wiki.linuxfoundation.org/networking/napi for more
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information on NAPI.
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Multiple Interfaces on Same Ethernet Broadcast Network
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------------------------------------------------------
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Due to the default ARP behavior on Linux, it is not possible to have one
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system on two IP networks in the same Ethernet broadcast domain
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(non-partitioned switch) behave as expected. All Ethernet interfaces
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will respond to IP traffic for any IP address assigned to the system.
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This results in unbalanced receive traffic.
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If you have multiple interfaces in a server, either turn on ARP
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filtering by
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(1) entering::
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echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
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(this only works if your kernel's version is higher than 2.4.5), or
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(2) installing the interfaces in separate broadcast domains (either
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in different switches or in a switch partitioned to VLANs).
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Support
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=======
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For general information, go to the Intel support website at:
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http://www.intel.com/support/
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or the Intel Wired Networking project hosted by Sourceforge at:
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http://sourceforge.net/projects/e1000
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If an issue is identified with the released source code on a supported kernel
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with a supported adapter, email the specific information related to the issue
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to e1000-devel@lists.sf.net.
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