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# Round Robin
# This is a deficit round robin scheduler
#
# **** 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::RoundRobin;
use strict;
use warnings;
require Vyatta::Config;
require Vyatta::Qos::ShaperClass;
# Create a new instance based on config information
sub new {
my ( $that, $config, $name ) = @_;
my @classes = _getClasses( $config->setLevel() );
_checkClasses( @classes );
my $self = {};
my $class = ref($that) || $that;
bless $self, $class;
$self->{_classes} = \@classes;
return $self;
}
# Check constraints on sub queues
sub _checkClasses {
my $level = shift;
foreach my $class (@_) {
my $level = $class->{level};
my $qtype = $class->{_qdisc};
my $qlimit = $class->{_limit};
if ($qtype eq 'random-detect' && defined($qlimit) && $qlimit >= 128) {
print STDERR "Configuration error in: $level\n";
die "queue limit must be between 1 and 127 for random-detect\n";
}
}
}
sub _getClasses {
my $level = shift;
my @classes;
my $config = new Vyatta::Config;
$config->setLevel("$level default");
my $default = new Vyatta::Qos::ShaperClass($config);
if ($default) {
push @classes, $default;
$default->{id} = 1;
}
foreach my $id ( $config->listNodes("class") ) {
$config->setLevel("$level class $id");
push @classes, new Vyatta::Qos::ShaperClass( $config, $id );
}
return @classes;
}
sub commands {
my ( $self, $dev ) = @_;
my $classes = $self->{_classes};
my $parent = 1;
printf "qdisc add dev %s root handle %x: drr", $dev, $parent;
print " quantum $self->{_quantum}" if ( $self->{_quantum} );
print "\n";
foreach my $class (sort { $a->{id} <=> $b->{id} } @$classes) {
$class->gen_class( $dev, 'drr', $parent );
$class->gen_leaf( $dev, $parent );
if ($class->{id} == 1) {
printf "filter add dev %s parent %x: prio %d",
$dev, $parent, 4096;
printf " protocol all basic flowid %x:1\n", $parent;
next;
}
foreach my $match ( $class->matchRules() ) {
$match->filter( $dev, $parent, $class->{id}, $class->{id} - 1 );
}
}
}
1;
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