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# Priority Queue
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2008 Vyatta, Inc.
# All Rights Reserved.
# **** End License ****
package Vyatta::Qos::Priority;
use strict;
use warnings;
require Vyatta::Config;
require Vyatta::Qos::ShaperClass;
use POSIX;
# Kernel limits on quantum (bytes)
use constant {
MAXQUANTUM => 200000,
MINQUANTUM => 1000,
};
# Create a new instance based on config information
sub new {
my ( $that, $config, $name ) = @_;
my $level = $config->setLevel();
my @classes = _getClasses($level);
my $self = {};
my $class = ref($that) || $that;
bless $self, $class;
$self->{_level} = $level;
$self->{_classes} = \@classes;
return $self;
}
sub _getClasses {
my $level = shift;
my @classes;
my $config = new Vyatta::Config;
$config->setLevel($level);
$config->exists("default")
or die "$level configuration not complete: missing default class\n";
$config->setLevel("$level default");
push @classes, new Vyatta::Qos::ShaperClass($config);
$config->setLevel($level);
foreach my $id ( $config->listNodes("class") ) {
$config->setLevel("$level class $id");
push @classes, new Vyatta::Qos::ShaperClass( $config, $id );
}
return @classes;
}
# Note: priority does not have internal classes, only sub-qdisc's
#
# Although Linux supports mapping TOS and priority to bands, this
# is not used here. Instead we apply filters to traffic and statically
# assign bands.
sub commands {
my ( $self, $dev ) = @_;
my $classes = $self->{_classes};
my $default = shift @$classes;
my $maxid = 1;
my $bands = 2;
foreach my $class (@$classes) {
my $level = "$self->{_level} class $class->{id}";
$class->valid_leaf( $level );
# find largest class id
$maxid = $class->{id}
if ( defined $class->{id} && $class->{id} > $maxid );
# find largest priority
my $prio = $class->{_priority};
$bands = $prio + 1
if ( defined $prio && $prio >= $bands);
}
# fill in id of default
$default->{id} = ++$maxid;
unshift @$classes, $default;
my $parent = 1;
my $root = "root";
# Since we use filters to set priority
printf "qdisc add dev %s %s handle %x: prio bands %d\n",
$dev, $root, $parent, $bands;
# prio is not really classful!
foreach my $class (@$classes) {
$class->gen_leaf( $dev, $parent );
my $prio = 1;
foreach my $match ( $class->matchRules() ) {
$match->filter( $dev, $parent, $class->{id}, $prio++ );
}
}
}
1;
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