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# Traffic shaper
# This is a extended form of Hierarchal Token Bucket with
# more admin friendly features. Similar in spirt to other shaper scripts
# such as wondershaper.
#
# **** 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::TrafficShaper;
use strict;
use warnings;
require Vyatta::Config;
require Vyatta::Qos::ShaperClass;
use Vyatta::Qos::Util qw/getRate getAutoRate/;
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 $rate = $config->returnValue("bandwidth");
my $level = $config->setLevel();
my @classes = _getClasses($level);
_checkClasses( $level, $rate, @classes );
my $self = {};
my $class = ref($that) || $that;
bless $self, $class;
$self->{_rate} = $rate;
$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;
}
# Check constraints on class bandwidth values
sub _checkClasses {
my $level = shift;
my $rate = shift;
my $default = shift;
# if auto, can't check for constraints until later
$rate = ( $rate eq "auto" ) ? undef : getRate($rate);
die "Bandwidth not defined for default traffic\n"
unless $default->{_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 $rate;
}
}
sub _minRate {
my ($speed, $classes) = @_;
my $min = $speed / 8;
foreach my $class (@$classes) {
my $bps = $class->get_rate($speed) / 8; # bytes per second
$min = $bps if $bps < $min;
}
return $min;
}
# Compute optimum quantum scaling factor
# quantum = Bps / r2q
# and find r2q valute such that (1000 < quantum < 200000 )
sub _r2q {
my ($speed, $classes) = @_;
my $maxbps = $speed / 8;
my $r2q = 10;
# need a bigger r2q if going fast than 16 mbits/sec
if ($maxbps / $r2q >= MAXQUANTUM) {
$r2q = ceil($maxbps / MAXQUANTUM);
} else {
# if there is a slow class then may need smaller value
my $minbps = _minRate($speed, $classes);
# try and find "just right value"
while ($r2q > 1 && ($minbps / $r2q) < MINQUANTUM) {
my $next = $r2q - 1;
# don't go too small
last if ($maxbps / $next >= MAXQUANTUM);
$r2q = $next;
}
}
return $r2q;
}
sub commands {
my ( $self, $dev ) = @_;
my $rate = getAutoRate( $self->{_rate}, $dev );
my $classes = $self->{_classes};
my %dsmark = ();
my $default = shift @$classes;
my $maxid = 1;
$default->rateCheck( $rate, "$self->{_level} default" );
foreach my $class (@$classes) {
my $level = "$self->{_level} class $class->{id}";
$class->rateCheck( $rate, $level );
$class->valid_leaf( $level );
# 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;
# Check if we need dsmrk
my $usedsmark;
foreach my $class (@$classes) {
if ( defined $class->{dsmark} ) {
$usedsmark = 1;
last;
}
}
my $parent = 1;
my $root = "root";
# if we need to change dsfield values, then put dsmark in front
if ($usedsmark) {
# dsmark max index must be power of 2
my $indices = $maxid + 1;
while ( ( $indices & ( $indices - 1 ) ) != 0 ) {
++$indices;
}
print "qdisc add dev $dev handle 1:0 root dsmark"
. " indices $indices default_index $default->{id} set_tc_index\n";
foreach my $class (@$classes) {
$class->dsmarkClass( 1, $dev );
foreach my $match ( $class->matchRules() ) {
$match->filter( $dev, $parent, $class->{id}, 1 );
}
}
$parent = $indices + 1;
$root = "parent 1:1";
}
my $r2q = _r2q($rate, $classes);
printf "qdisc add dev %s %s handle %x: htb r2q %d default %x\n",
$dev, $root, $parent, $r2q, $default->{id};
printf "class add dev %s parent %x: classid %x:1 htb rate %s\n",
$dev, $parent, $parent, $rate;
foreach my $class (@$classes) {
$class->gen_class( $dev, 'htb', $parent, $rate, $r2q );
$class->gen_leaf( $dev, $parent, $rate );
my $prio = 1;
foreach my $match ( $class->matchRules() ) {
$match->filter( $dev, $parent, $class->{id}, $prio++,
$class->{dsmark} );
}
}
}
1;
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