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# Traffic shaper sub-class
# **** 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::ShaperClass;
use strict;
use warnings;
require Vyatta::Config;
use Vyatta::Qos::Match;
use Vyatta::Qos::Util qw/getDsfield getRate/;
sub new {
my ( $that, $config, $id ) = @_;
my $class = ref($that) || $that;
my $self = { };
$self->{id} = $id;
bless $self, $class;
if ($config) {
my $level = $config->setLevel();
$self->{level} = $level;
$self->{_rate} = $config->returnValue("bandwidth");
$self->{_priority} = $config->returnValue("priority");
$self->{_ceiling} = $config->returnValue("ceiling");
$self->{_burst} = $config->returnValue("burst");
$self->{_limit} = $config->returnValue("queue-limit");
$self->{_qdisc} = $config->returnValue("queue-type");
$self->{dsmark} = getDsfield( $config->returnValue("set-dscp") );
my @matches = _getMatch("$level match");
$self->{_match} = \@matches;
}
return $self;
}
sub _getMatch {
my $level = shift;
my @matches;
my $config = new Vyatta::Config;
foreach my $match ( $config->listNodes($level) ) {
$config->setLevel("$level $match");
push @matches, new Vyatta::Qos::Match($config);
}
return @matches;
}
sub matchRules {
my ($self) = @_;
my $matches = $self->{_match};
return @$matches;
}
sub _getPercentRate {
my ( $rate, $speed ) = @_;
return unless $rate; # no rate defined;
# Rate might be a percentage of speed
if ( $rate =~ /%$/ ) {
my $percent = substr( $rate, 0, length($rate) - 1 );
if ( $percent < 0 || $percent > 100 ) {
die "Invalid percentage bandwidth: $percent\n";
}
$rate = ( $percent * $speed ) / 100.;
}
else {
$rate = getRate($rate);
}
return $rate;
}
sub rateCheck {
my ( $self, $limit, $level ) = @_;
my $rate = _getPercentRate( $self->{_rate}, $limit );
if ( $rate > $limit ) {
print STDERR "Configuration error in: $level\n";
printf STDERR
"The bandwidth reserved for this class (%dKbps) must be less than\n",
$rate / 1000;
printf STDERR "the bandwidth for the overall policy (%dKbps)\n",
$limit / 1000;
exit 1;
}
my $ceil = _getPercentRate( $self->{_ceiling}, $limit );
if ( defined $ceil && $ceil < $rate ) {
print STDERR "Configuration error in: $level\n";
printf STDERR
"The bandwidth ceiling for this class (%dKbps) must be greater or equal to\n",
$ceil / 1000;
printf STDERR "the reserved bandwidth for the class (%dKbps)\n",
$rate / 1000;
exit 1;
}
}
sub prioQdisc {
my ( $self, $dev, $rate ) = @_;
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, $rate ) = @_;
print "sfq";
print " limit $self->{_limit}" if ( $self->{_limit} );
print "\n";
}
sub fifoQdisc {
my ( $self, $dev, $rate ) = @_;
print "pfifo";
print " limit $self->{_limit}" if ( $self->{_limit} );
print "\n";
}
# Red is has way to many configuration options
# make some assumptions to make this sane (based on LARTC)
# average size := 1000 bytes
# limit := queue-limit * average
# max := limit / 8
# min := max / 3
# burst := (2 * min + max) / (3 * average)
sub redQdisc {
my ( $self, $dev, $rate ) = @_;
my $limit = $self->{_limit};
my $avg = 1000;
my $qlimit;
if ( defined $limit ) {
$qlimit = $limit * $avg; # red limit in bytes
}
else {
# rate is in bits/sec so queue-limit = 8 * 500ms * rate
$qlimit = $rate / 2;
}
my $qmax = $qlimit / 8;
my $qmin = $qmax / 3;
printf "red limit %d min %d max %d avpkt %d", $qlimit, $qmin, $qmax, $avg;
printf " burst %d probability 0.02 bandwidth %d ecn\n",
( 2 * $qmin + $qmax ) / ( 3 * $avg ), $rate / 1000;
}
my %qdiscOptions = (
'priority' => \&prioQdisc,
'fair-queue' => \&sfqQdisc,
'random-detect' => \&redQdisc,
'drop-tail' => \&fifoQdisc,
);
sub gen_class {
my ( $self, $dev, $qdisc, $parent, $speed ) = @_;
my $rate = _getPercentRate( $self->{_rate}, $speed );
my $ceil = _getPercentRate( $self->{_ceiling}, $speed );
printf "class add dev %s parent %x:1 classid %x:%x %s",
$dev, $parent, $parent, $self->{id}, $qdisc;
print " rate $rate" if ($rate);
print " ceil $ceil" if ($ceil);
print " burst $self->{_burst}" if ( $self->{_burst} );
print " prio $self->{_priority}" if ( $self->{_priority} );
print "\n";
}
sub gen_leaf {
my ( $self, $dev, $parent, $rate ) = @_;
printf "qdisc add dev %s parent %x:%x ", $dev, $parent, $self->{id};
my $q = $qdiscOptions{ $self->{_qdisc} };
$q->( $self, $dev, $rate ) if ($q);
}
sub dsmarkClass {
my ( $self, $parent, $dev ) = @_;
printf "class change dev %s classid %x:%x dsmark",
$dev, $parent, $self->{id};
if ( $self->{dsmark} ) {
print " mask 0 value $self->{dsmark}\n";
}
else {
print " mask 0xff value 0\n";
}
}
1;
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