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# Weighted Random i.e. GRED (Generic Random Early Detect)
#
# **** 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::WeightedRandom;
use strict;
use warnings;
require Vyatta::Config;
require Vyatta::Qos::ShaperClass;
my $wred = 'weighted-random-detect';
# Create a new instance based on config information
sub new {
my ( $that, $config, $name ) = @_;
my $level = $config->setLevel();
my $rate = $config->returnValue("bandwidth");
my @classes = _getClasses($level);
_checkClasses( $level, $rate, @classes );
my $self = {};
my $class = ref($that) || $that;
bless $self, $class;
$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;
}
# Check constraints on class bandwidth values
sub _checkClasses {
my $level = shift;
my $rate = shift;
my $default = shift;
# if auto, can't check at create must wait for policy to be applied
$rate = ( $rate eq "auto" ) ? undef : getRate($rate);
$default->rateCheck( $rate, "$level default" ) if $rate;
foreach my $class (@_) {
die "$class->{level} bandwidth not defined\n" unless $class->{_rate};
$class->rateCheck( $rate, "$level class $class->{id}" ) if $rate;
}
}
sub commands {
my ( $self, $dev ) = @_;
my $rate = getAutoRate( $self->{_rate}, $dev );
my $classes = $self->{_classes};
my $default = shift @$classes;
my $maxid = 1;
$default->rateCheck( $rate, "$self->{_level} default" );
foreach my $class (@$classes) {
$class->rateCheck( $rate, "$self->{_level} class $class->{id}" );
# find largest class id
if ( defined $class->{id} && $class->{id} > $maxid ) {
$maxid = $class->{id};
}
}
# fill in id of default
$default->{id} = ++$maxid;
unshift @$classes, $default;
print "qdisc add dev $dev root handle 1: gred";
print " setup DPs $maxid default $maxid";
foreach my $class (@$classes) {
my $classbw = $class->get_rate($rate);
my $avg = $class->{_avgpkt};
my $latency = $class->{_latency};
my ( $qmin, $qmax, $burst ) = RedParam( $classbw, $latency, $avg );
print "qdisc chang dev $dev root gred ";
printf "limit %d min %d max %d avpkt %d", 4 * $qmax, $qmin, $qmax, $avg;
printf " burst %d probability 0.02 bandwidth %d ecn\n",
$burst, $classbw / 1000;
foreach my $match ( $class->matchRules() ) {
$match->filter( $dev, 1, $class->{_priority} );
printf " flowid :%x\n", $class->{id};
}
}
}
# Walk configuration tree and look for changed nodes
# The configuration system should do this but doesn't do it right
sub isChanged {
my ( $self, $name ) = @_;
my $config = new Vyatta::Config;
my @attributes =
qw(bandwidth burst latency packet-length priority queue-limit);
$config->setLevel("qos-policy $wred $name");
return 'bandwidth' if ( $config->isChanged('bandwidth') );
foreach my $attr (@attributes) {
return "default $attr" if ( $config->isChanged("default $attr") );
}
my %classNodes = $config->listNodeStatus('class');
while ( my ( $class, $status ) = each %classNodes ) {
return "class $class" if ( $status ne 'static' );
foreach my $attr (@attributes) {
return "class $class $attr"
if ( $config->isChanged("class $class $attr") );
}
my %matchNodes = $config->listNodeStatus("class $class match");
while ( my ( $match, $status ) = each %matchNodes ) {
my $level = "class $class match $match";
return $level if ( $status ne 'static' );
foreach my $parm (
'vif',
'ether destination',
'ether source',
'ether protocol',
'interface',
'ip dscp',
'ip protocol',
'ip source address',
'ip destination address',
'ip source port',
'ip destination port'
)
{
return "$level $parm" if ( $config->isChanged("$level $parm") );
}
}
}
return; # false
}
1;
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