1 files changed, 68 insertions, 0 deletions
diff --git a/lib/Vyatta/Qos/FairQueue.pm b/lib/Vyatta/Qos/FairQueue.pm
new file mode 100644
index 0000000..9897e29
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+++ b/lib/Vyatta/Qos/FairQueue.pm
@@ -0,0 +1,68 @@
+# This is a wrapper around Stochastic Fair Queue(SFQ) queue discipline
+# Since SFQ is a hard to explain, use the name fair-queue since SFQ
+# is most similar to Weighted Fair Queue (WFQ) on Cisco IOS.
+#
+#
+# **** 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::FairQueue;
+
+use strict;
+use warnings;
+
+require VyattaConfig;
+
+# Fair Queue
+# Uses SFQ which is similar to (but not same as) WFQ
+
+my %fields = (
+    _perturb => undef,
+    _limit   => undef,
+);
+
+sub new {
+    my ( $that, $config ) = @_;
+    my $class = ref($that) || $that;
+    my $self = {%fields};
+
+    $self->{_perturb} = $config->returnValue('hash-interval');
+    $self->{_limit}   = $config->returnValue('queue-limit');
+    return bless $self, $class;
+}
+
+sub commands {
+    my ( $self, $out, $dev ) = @_;
+    
+    print {$out} "qdisc add dev $dev root sfq";
+    print {$out} " perturb $self->{_perturb}" if ( defined $self->{_perturb} );
+    print {$out} " limit $self->{_limit}"     if ( defined $self->{_limit} );
+    print "\n";
+}
+
+sub isChanged {
+    my ( $self, $name ) = @_;
+    my $config = new VyattaConfig;
+
+    $config->setLevel("qos-policy fair-queue $name");
+    foreach my $attr ('hash-interval', 'queue-limit') {
+	if ($config->isChanged($attr)) {
+	    return $attr
+	}
+    }
+    return undef; # false
+}
+
+1;