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# Random Detect
#
# This Qos module uses DSMARK and GRED to provide a policy
# similar to Cisco Weighted Random Detect.
#
# See Almesberger, Werner; Hadi Salim, Jamal; Kuznetsov, Alexey
# "Differentiated Services on Linux"
# http://www.almesberger.net/cv/papers/18270721.pdf
#
# **** 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::FairBlue;
use strict;
use warnings;
require Vyatta::Config;
use Vyatta::Qos::Util qw/getRate getAutoRate getTime/;
my %qdiscOptions = (
'priority' => \&prioQdisc,
'fair-queue' => \&sfqQdisc,
'drop-tail' => \&fifoQdisc,
);
# Create a new instance based on config information
sub new {
my ( $that, $config, $name ) = @_;
my $level = $config->setLevel();
my $target = $config->returnValue("queue-target");
die "queue-target configuration missing\n" unless $target;
my $limit = $config->returnValue("queue-limit");
die "queue-limit configuration missing\n" unless $limit;
my $type = $config->returnValue("queue-type");
$type = "fair-queue" if (!defined($type));
my $pburst = $config->returnValue("penalty burst");
my $prate = $config->returnValue("penalty rate");
my $self = {};
my $class = ref($that) || $that;
bless $self, $class;
$self->{_target} = $target;
$self->{_limit} = $limit;
$self->{_type} = $type;
$self->{_pburst} = $pburst;
$self->{_prate} = $prate;
sfqValidate($self, $level) if ($self->{_type} eq "fair-queue");
return $self;
}
sub sfqValidate {
my ( $self, $level ) = @_;
my $limit = $self->{_limit};
if ( defined $limit && $limit > 127 ) {
die "queue limit must be between 1 and 127 for queue-type fair-queue\n";
}
}
sub prioQdisc {
my ( $self, $dev ) = @_;
my $prio_id = 0x4000 + $self->{id};
my $limit = $self->{_limit};
printf "handle %x: prio\n", $prio_id;
if ($limit) {
foreach my $i (qw/1 2 3/) {
printf "qdisc add dev %s parent %x:%x pfifo limit %d\n",
$dev, $prio_id, $i, $limit;
}
}
}
sub sfqQdisc {
my ( $self, $dev ) = @_;
print "sfq perturb 10";
print " limit $self->{_limit}" if ( $self->{_limit} );
print "\n";
}
sub fifoQdisc {
my ( $self, $dev ) = @_;
print "pfifo";
print " limit $self->{_limit}" if ( $self->{_limit} );
print "\n";
}
sub gen_leaf {
my ( $self, $dev, $parent ) = @_;
my $qtype = $self->{_type};
return unless $qtype; # default is okay
my $q = $qdiscOptions{$qtype};
die "Unknown queue-type $qtype\n"
unless $q;
printf "qdisc add dev %s parent %x:%x ", $dev, $parent, 0;
$q->( $self, $dev );
}
sub commands {
my ( $self, $dev ) = @_;
my $root = 1;
printf("qdisc add dev %s root handle %x:0 sfb limit %d target %d ",
$dev, $root, $self->{_limit}, $self->{_target});
printf(" penalty_rate %d ", $self->{_prate}) if (defined $self->{_prate});
printf(" penalty_burst %d", $self->{_pburst}) if (defined $self->{_pburst});
print("\n");
gen_leaf( $self, $dev, $root);
}
1;
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