Add priority policy support

New policy allowing strict priority traffic assignment

1 files changed, 131 insertions, 0 deletions

diff --git a/lib/Vyatta/Qos/Priority.pm b/lib/Vyatta/Qos/Priority.pm
new file mode 100644
index 0000000..f4f01da
--- /dev/null
+++ b/lib/Vyatta/Qos/Priority.pm
@@ -0,0 +1,131 @@
+# Strict Priority
+# This is a deficit round robin scheduler
+#
+# **** 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::Priority;
+use strict;
+use warnings;
+
+require Vyatta::Config;
+require Vyatta::Qos::ShaperClass;
+
+# Create a new instance based on config information
+sub new {
+    my ( $that, $config, $name ) = @_;
+
+    my @classes = _getClasses( $config->setLevel() );
+    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);
+    my $default;
+    if ( $config->exists("default") ) {
+        $config->setLevel("$level default");
+        $default = new Vyatta::Qos::ShaperClass($config);
+        $config->setLevel($level);
+    }
+    else {
+        $default = new Vyatta::Qos::ShaperClass;
+    }
+    push @classes, $default;
+    $default->{id} = 1;
+
+    foreach my $id ( $config->listNodes("class") ) {
+        $config->setLevel("$level class $id");
+        push @classes, new Vyatta::Qos::ShaperClass( $config, $id );
+    }
+
+    return @classes;
+}
+
+sub commands {
+    my ( $self, $dev ) = @_;
+    my $classes = $self->{_classes};
+    my $parent  = 1;
+
+    printf "qdisc add dev %s s handle %x: prio limit %d\n",
+      $dev, 'root', $parent, $self->{_limit};
+
+    foreach my $class (@$classes) {
+        $class->gen_leaf( $dev, $parent );
+        foreach my $match ( $class->matchRules() ) {
+            $match->filter( $dev, $parent, 1 );
+            printf " parent %x:%x\n", $parent, $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;
+
+    $config->setLevel("qos-policy priority-queue $name");
+
+    foreach my $attr (qw(queue-limit queue-type)) {
+        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 (qw(queue-limit queue-type)) {
+            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";
+            if ( $status ne 'static' ) {
+                return $level;
+            }
+
+            foreach my $parm (
+                (
+                    'vif',
+                    'interface',
+                    'ip protocol',
+                    'ip source address',
+                    'ip destination address',
+                    'ip source port',
+                    'ip destination port'
+                )
+              )
+            {
+                return "$level $parm"
+                  if ( $config->isChanged("$level $parm") );
+            }
+        }
+    }
+
+    return;    # false
+}
+
+1;