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man tc: Highlight minor & major, notice they are hex

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Also added some trivial form of the ID as "major:minor",
just for visualisation of explained words.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
This commit is contained in:
Vadim Kochan 2015-03-09 01:07:17 +02:00 committed by Stephen Hemminger
parent 032b4f4d19
commit 8ce21c6b93
1 changed files with 20 additions and 10 deletions
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30
man/man8/tc.8
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@ -250,23 +250,33 @@ attached to that class. Check qdisc specific manpages for details, however.
All qdiscs, classes and filters have IDs, which can either be specified
or be automatically assigned.
IDs consist of a major number and a minor number, separated by a colon.
Both major and minor number are limited to 16 bits. There are two special
values: root is signified by major and minor of all ones, and unspecified
is all zeros.
IDs consist of a
.BR major " number and a " minor
number, separated by a colon -
.BR major ":" minor "."
Both
.BR major " and " minor
are hexadecimal numbers and are limited to 16 bits. There are two special
values: root is signified by
.BR major " and " minor
of all ones, and unspecified is all zeros.
.TP
QDISCS
A qdisc, which potentially can have children,
gets assigned a major number, called a 'handle', leaving the minor
A qdisc, which potentially can have children, gets assigned a
.B major
number, called a 'handle', leaving the
.B minor
number namespace available for classes. The handle is expressed as '10:'.
It is customary to explicitly assign a handle to qdiscs expected to have
children.
It is customary to explicitly assign a handle to qdiscs expected to have children.
.TP
CLASSES
Classes residing under a qdisc share their qdisc major number, but each have
a separate minor number called a 'classid' that has no relation to their
Classes residing under a qdisc share their qdisc
.B major
number, but each have a separate
.B minor
number called a 'classid' that has no relation to their
parent classes, only to their parent qdisc. The same naming custom as for
qdiscs applies.