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man: clean up naming scheme description a bit

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This is in preparation for later changes.  Let's change the documentation of
net.naming-scheme= to also say that it applies to MAC addresses. This commit
doesn't actually implement that though.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2019-06-17 09:21:57 +02:00
parent 4b381a9ef6
commit 2ebe027b44
2 changed files with 30 additions and 29 deletions
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45
man/systemd.net-naming-scheme.xml
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@ -22,29 +22,30 @@
<refsect1>
<title>Description</title>
<para>Network interfaces may be renamed to give them predictable names when there's enough information to
generate appropriate names and the use of certain types of names is configured. This page describes the
first part, i.e. what possible names may be generated. Those names are generated by the
<para>Network interfaces names and MAC addresses may be generated based on certain stable interface
attributes. This is possible when there is enough information about the device to generate those
attributes and the use of this information is configured. This page describes interface naming, i.e. what
possible names may be generated. Those names are generated by the
<citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
builtin <command>net_id</command> and exported as udev properties
(<varname>ID_NET_NAME_ONBOARD=</varname>, <varname>ID_NET_LABEL_ONBOARD=</varname>,
<varname>ID_NET_NAME_PATH=</varname>, <varname>ID_NET_NAME_SLOT=</varname>).</para>
<para>Names are derived from various device metadata attributes. Newer versions of udev take more of
these attributes into account, improving (and thus possibly changing) the names used for the same
devices. Differents version of the naming rules are called "naming schemes". The default naming scheme is
chosen at compilation time. Usually this will be the latest implemented version, but it is also possible
to set one of the older versions to preserve compatibility. This may be useful for example for
distributions, which may introduce new versions of systemd in stable releases without changing the naming
scheme. The naming scheme may also be overriden using the <varname>net.naming-scheme=</varname> kernel
command line switch, see
<para>Names and MAC addresses are derived from various stable device metadata attributes. Newer versions
of udev take more of these attributes into account, improving (and thus possibly changing) the names and
addresses used for the same devices. Different versions of those generation rules are called "naming
schemes". The default naming scheme is chosen at compilation time. Usually this will be the latest
implemented version, but it is also possible to set one of the older versions to preserve
compatibility. This may be useful for example for distributions, which may introduce new versions of
systemd in stable releases without changing the naming scheme. The naming scheme may also be overriden
using the <varname>net.naming-scheme=</varname> kernel command line switch, see
<citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
Available naming schemes are described below.</para>
<para>After the udev proprties have been generated, appropriate udev rules may be used to actually rename
devices based on those properties. See the description of <varname>NamePolicy=</varname> in
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
devices based on those properties. See the description of <varname>NamePolicy=</varname> and
<varname>MACAddressPolicy=</varname> in
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</refsect1>
<refsect1>
@ -288,7 +289,7 @@
<varlistentry>
<term><constant>v240</constant></term>
<para>The <literal>ib</literal> prefix and stable names for infiniband devices are
<listitem><para>The <literal>ib</literal> prefix and stable names for infiniband devices are
introduced. Previously those devices were not renamed.</para>
<para>The ACPI index field (used in <varname>ID_NET_NAME_ONBOARD=</varname>) is now also used when
@ -301,22 +302,22 @@
configuration, even if they have been renamed already, if <constant>keep</constant> is not
specified as the naming policy in the <filename noindex='true'>.link</filename> file. See
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for a description of <varname>NamePolicy=</varname>.</para>
for a description of <varname>NamePolicy=</varname>.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>v243</constant></term>
<para>Support for netdevsim (simulated networking devices) was added. Previously those devices were
not renamed.</para>
<listitem><para>Support for renaming netdevsim (simulated networking) devices was added. Previously
those devices were not renamed.</para>
<para>Previously two-letter interface type prefix was prepended to
<varname>ID_NET_LABEL_ONBOARD=</varname>. This is not done anymore.</para>
<varname>ID_NET_LABEL_ONBOARD=</varname>. This is not done anymore.</para></listitem>
</varlistentry>
<para>Note that <constant>latest</constant> may be used to denote the latest scheme known (to this
particular version of systemd.</para>
</variablelist>
<para>Note that <constant>latest</constant> may be used to denote the latest scheme known (to this
particular version of systemd.</para>
</refsect1>
<refsect1>

14
src/udev/net/naming-scheme.h
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@ -22,13 +22,13 @@
* OS versions, but not fully stabilize them. */
typedef enum NamingSchemeFlags {
/* First, the individual features */
NAMING_SR_IOV_V = 1 << 0, /* Use "v" suffix for SR-IOV, see 609948c7043a40008b8299529c978ed8e11de8f6*/
NAMING_NPAR_ARI = 1 << 1, /* Use NPAR "ARI", see 6bc04997b6eab35d1cb9fa73889892702c27be09 */
NAMING_INFINIBAND = 1 << 2, /* Use "ib" prefix for infiniband, see 938d30aa98df887797c9e05074a562ddacdcdf5e */
NAMING_ZERO_ACPI_INDEX = 1 << 3, /* Use zero acpi_index field, see d81186ef4f6a888a70f20a1e73a812d6acb9e22f */
NAMING_ALLOW_RERENAMES = 1 << 4, /* Allow re-renaming of devices, see #9006 */
NAMING_NETDEVSIM = 1 << 5, /* Generate names for netdevsim devices, see eaa9d507d85509c8bf727356e3884ec54b0fc646 */
NAMING_LABEL_NOPREFIX = 1 << 6, /* Don't prepend ID_NET_LABEL_ONBOARD with interface type prefix */
NAMING_SR_IOV_V = 1 << 0, /* Use "v" suffix for SR-IOV, see 609948c7043a */
NAMING_NPAR_ARI = 1 << 1, /* Use NPAR "ARI", see 6bc04997b6ea */
NAMING_INFINIBAND = 1 << 2, /* Use "ib" prefix for infiniband, see 938d30aa98df */
NAMING_ZERO_ACPI_INDEX = 1 << 3, /* Use zero acpi_index field, see d81186ef4f6a */
NAMING_ALLOW_RERENAMES = 1 << 4, /* Allow re-renaming of devices, see #9006 */
NAMING_NETDEVSIM = 1 << 5, /* Generate names for netdevsim devices, see eaa9d507d855 */
NAMING_LABEL_NOPREFIX = 1 << 6, /* Don't prepend ID_NET_LABEL_ONBOARD with interface type prefix */
/* And now the masks that combine the features above */
NAMING_V238 = 0,