"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2014 Tom Gundersen
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
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-->
<refentry id="systemd.link">
how the device should be configured. The first (in lexical order)
of the link files that matches a given device is applied. Note
that a default file <filename>99-default.link</filename> is
- shipped by the system, any user-supplied
+ shipped by the system. Any user-supplied
<filename>.link</filename> should hence have a lexically earlier
name to be considered at all.</para>
<listitem>
<para>A whitespace-separated list of shell-style globs matching
the device name, as exposed by the udev property
- "INTERFACE". This can not be used to match on names that have
+ "INTERFACE". This cannot be used to match on names that have
already been changed from userspace. Caution is advised when matching on
kernel-assigned names, as they are known to be unstable
between reboots.</para>
for details.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>KernelVersion=</varname></term>
+ <listitem>
+ <para>Checks whether the kernel version (as reported by <command>uname -r</command>) matches a certain
+ expression (or if prefixed with the exclamation mark does not match it). See
+ <literal>ConditionKernelVersion=</literal> in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
+ details.
+ </para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><varname>Architecture=</varname></term>
<listitem>
<varname>NamePolicy=</varname> fail, or in case
<varname>NamePolicy=</varname> is missing or
disabled.</para>
+
+ <para>Note that specifying a name that the kernel might use for another
+ interface (for example <literal>eth0</literal>) is dangerous because the
+ name assignment done by udev will race with the assignment done by the
+ kernel, and only one interface may use the name. Depending on the order of
+ operations, either udev or the kernel will win, making the naming
+ unpredictable. It is best to use some different prefix, for example
+ <literal>internal0</literal>/<literal>external0</literal> or
+ <literal>lan0</literal>/<literal>lan1</literal>/<literal>lan3</literal>.
+ </para>
</listitem>
</varlistentry>
<varlistentry>
<literal>full</literal>.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>AutoNegotiation=</varname></term>
+ <listitem>
+ <para>Enables or disables automatic negotiation of transmission parameters.
+ Autonegotiation is a procedure by which two connected ethernet devices choose
+ common transmission parameters, such as speed, duplex mode, and flow control.
+ Takes a boolean value. Unset by default, which means that the kernel default
+ will be used.</para>
+
+ <para>Note that if autonegotiation is enabled, speed and duplex settings are
+ read-only. If autonegotation is disabled, speed and duplex settings are writable
+ if the driver supports multiple link modes.</para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><varname>WakeOnLan=</varname></term>
<listitem>
<para>Wake on PHY activity.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><literal>unicast</literal></term>
+ <listitem>
+ <para>Wake on unicast messages.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>multicast</literal></term>
+ <listitem>
+ <para>Wake on multicast messages.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>broadcast</literal></term>
+ <listitem>
+ <para>Wake on broadcast messages.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>arp</literal></term>
+ <listitem>
+ <para>Wake on ARP.</para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><literal>magic</literal></term>
<listitem>
</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><literal>secureon</literal></term>
+ <listitem>
+ <para>Enable secureon(tm) password for MagicPacket(tm).
+ </para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><literal>off</literal></term>
<listitem>
</listitem>
</varlistentry>
</variablelist>
+
+ <para>Defaults to <literal>off</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Port=</varname></term>
+ <listitem>
+ <para>The port option is used to select the device port. The
+ supported values are:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><literal>tp</literal></term>
+ <listitem>
+ <para>An Ethernet interface using Twisted-Pair cable as the medium.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>aui</literal></term>
+ <listitem>
+ <para>Attachment Unit Interface (AUI). Normally used with hubs.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>bnc</literal></term>
+ <listitem>
+ <para>An Ethernet interface using BNC connectors and co-axial cable.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>mii</literal></term>
+ <listitem>
+ <para>An Ethernet interface using a Media Independent Interface (MII).</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>fibre</literal></term>
+ <listitem>
+ <para>An Ethernet interface using Optical Fibre as the medium.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>TCPSegmentationOffload=</varname></term>
+ <listitem>
+ <para>The TCP Segmentation Offload (TSO) when true enables
+ TCP segmentation offload. Takes a boolean value.
+ Defaults to "unset".</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>TCP6SegmentationOffload=</varname></term>
+ <listitem>
+ <para>The TCP6 Segmentation Offload (tx-tcp6-segmentation) when true enables
+ TCP6 segmentation offload. Takes a boolean value.
+ Defaults to "unset".</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>GenericSegmentationOffload=</varname></term>
+ <listitem>
+ <para>The Generic Segmentation Offload (GSO) when true enables
+ generic segmentation offload. Takes a boolean value.
+ Defaults to "unset".</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>GenericReceiveOffload=</varname></term>
+ <listitem>
+ <para>The Generic Receive Offload (GRO) when true enables
+ generic receive offload. Takes a boolean value.
+ Defaults to "unset".</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>LargeReceiveOffload=</varname></term>
+ <listitem>
+ <para>The Large Receive Offload (LRO) when true enables
+ large receive offload. Takes a boolean value.
+ Defaults to "unset".</para>
</listitem>
</varlistentry>
</variablelist>
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