libvtop.pm.in 164 KB
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#!/usr/bin/perl -wT
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#
# EMULAB-COPYRIGHT
# Copyright (c) 2005-2009 University of Utah and the Flux Group.
# All rights reserved.
#
package libvtop;

use strict;
use Exporter;
use vars qw(@ISA @EXPORT @EXPORT_OK
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	    $VTOP_FLAGS_UPDATE $VTOP_FLAGS_VERBOSE
	    $VTOP_FLAGS_FIXNODES $VTOP_FLAGS_IMPOTENT);
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@ISA    = "Exporter";
@EXPORT = qw( );

use libdb;
use libtblog;
use libtestbed;
use Experiment;
use VirtExperiment;
use Node;
use NodeType;
use Lan;
use OSinfo;
use English;
use Data::Dumper;
use Carp;
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use POSIX;
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use XML::LibXML;
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# Configure variables
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my $TB		  = "@prefix@";
my $BOSSNODE      = "@BOSSNODE@";
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my $AVAIL         = "$TB/bin/avail";
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my $DELAYCAPACITY = @DELAYCAPACITY@;	# Can be overridden by user!
my $DELAYTHRESH   = @DELAYTHRESH@;
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# Flags.
$VTOP_FLAGS_VERBOSE	= 0x01;
$VTOP_FLAGS_UPDATE	= 0x02;
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$VTOP_FLAGS_FIXNODES	= 0x04;
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$VTOP_FLAGS_IMPOTENT	= 0x08;
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@EXPORT_OK = qw($VTOP_FLAGS_UPDATE $VTOP_FLAGS_VERBOSE $VTOP_FLAGS_FIXNODES
		$VTOP_FLAGS_IMPOTENT);
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#
# Create an object representing the stuff we need to create the vtop file.
#
sub Create($$$)
{
    my ($class, $experiment, $flags) = @_;

    my $virtexperiment = VirtExperiment->Lookup($experiment);
    if (!defined($virtexperiment)) {
	tberror("Could not load virtual experiment object for $experiment\n");
	return undef;
    }

    my $self              = {};
    $self->{'EXPERIMENT'} = $experiment;
    $self->{'VIRTEXPT'}   = $virtexperiment;
    $self->{'FLAGS'}      = $flags;
    $self->{'VNODES'}     = {};
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    $self->{'DELAYNODES'} = {};
    $self->{'LANNODES'}   = {};
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    $self->{'VLANS'}      = {};
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    $self->{'MEMBEROF'}   = {};
    $self->{'COUNTERS'}   = {};
    $self->{'EXPTSTATS'}  = {};
    $self->{'DELAYLINKS'} = {};
    $self->{'OPTIONS'}    = {};
    $self->{'DELAYID'}    = 0;
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    $self->{'PHOSTID'}    = 0;
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    $self->{'IFACEID'}    = 32768;
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    $self->{'PORTBW'}     = {};
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    $self->{'RESULTS'}    = { "nodes"  => [],
			      "links"  => [],
			      "class"  => [],
			      "fixed"  => [] };
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    $self->{'PNODES'}      = {};
    $self->{'FIXEDNODES'}  = {};
    $self->{'CURRENT_V2P'} = {};
    $self->{'CURRENT_P2V'} = {};
    $self->{'CURRENT_V2V'} = {};

    # Below is for interpretation of assign results.
    $self->{'SOLUTION'}    = {};
    $self->{'OLDRSRVCLEAN'}= 0;
    $self->{'NEWRESERVED'} = {};	# Newly reserved nodes.
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    $self->{'NORECOVER'}   = 0;	
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    bless($self, $class);

    return $self;
}
# accessors
sub experiment($)       { return $_[0]->{'EXPERIMENT'}; }
sub virtexperiment($)   { return $_[0]->{'VIRTEXPT'}; }
sub flags($)            { return $_[0]->{'FLAGS'}; }
sub vnodes($)           { return $_[0]->{'VNODES'}; }
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sub delaynodes($)       { return $_[0]->{'DELAYNODES'}; }
sub lannodes($)         { return $_[0]->{'LANNODES'}; }
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sub vlans($)            { return $_[0]->{'VLANS'}; }
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sub memberof($)         { return $_[0]->{'MEMBEROF'}; }
sub counters($)         { return $_[0]->{'COUNTERS'}; }
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sub counter($$)         { return $_[0]->{'COUNTERS'}->{$_[1]}; }
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sub options($)          { return $_[0]->{'OPTIONS'}; }
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sub option($$)          { return (exists($_[0]->{'OPTIONS'}->{$_[1]}) ?
				  $_[0]->{'OPTIONS'}->{$_[1]} : undef); }
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sub exptstats($)        { return $_[0]->{'EXPTSTATS'}; }
sub delaylinks($)       { return $_[0]->{'DELAYLINKS'}; }
sub delaynodecount()    { return scalar(keys(%{ $_[0]->delaynodes() })); }
sub portbw($)           { return $_[0]->{'PORTBW'}; }
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sub results($)          { return $_[0]->{'RESULTS'}; }
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sub current_v2p($)      { return $_[0]->{'CURRENT_V2P'}; }
sub current_p2v($)      { return $_[0]->{'CURRENT_P2V'}; }
sub current_v2v($)      { return $_[0]->{'CURRENT_V2V'}; }
sub pnodes($)           { return $_[0]->{'PNODES'}; }
sub fixednodes($)       { return $_[0]->{'FIXEDNODES'}; }
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sub newreserved($)      { return $_[0]->{'NEWRESERVED'}; }
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sub newreservednodes($) { return @{ $_[0]->{'NEWRESERVED'} }; }
sub norecover($)        { return $_[0]->{'norecover'}; }
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sub pid($)		{ return $_[0]->experiment()->pid(); }
sub pid_idx($)		{ return $_[0]->experiment()->pid_idx(); }
sub eid($)		{ return $_[0]->experiment()->eid(); }
sub exptidx($)		{ return $_[0]->experiment()->idx(); }

# The virtual tables from the DB.
sub virt_table($$)      { return $_[0]->virtexperiment()->Table($_[1]); }
sub virt_vtypes($)	{ return $_[0]->virt_table("virt_vtypes"); }
sub virt_nodes($)       { return $_[0]->virt_table("virt_nodes"); }
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sub virt_lans($)        { return $_[0]->virt_table("virt_lans"); }
sub virt_lan_lans($)    { return $_[0]->virt_table("virt_lan_lans"); }
sub virt_desires($)	{ return $_[0]->virt_table("virt_node_desires"); }
sub virt_startloc($)	{ return $_[0]->virt_table("virt_node_startloc"); }
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sub virt_trafgens($)	{ return $_[0]->virt_table("virt_trafgens"); }
sub virt_lan_settings($){ return $_[0]->virt_table("virt_lan_settings"); }
sub virt_lan_member_settings($)	{
    return $_[0]->virt_table("virt_lan_member_settings"); }
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# Given a vname, is it a node in the topo (or something else like a delay).
sub isatoponode($$)     { return exists($_[0]->vnodes()->{$_[1]}); }
sub isadelaynode($$)    { return exists($_[0]->delaynodes()->{$_[1]}); }
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# Debug output.
sub verbose($)		{ return $_[0]->flags() & $VTOP_FLAGS_VERBOSE; }
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sub updating($)		{ return $_[0]->flags() & $VTOP_FLAGS_UPDATE; }
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sub fixcurrent($)	{ return $_[0]->flags() & $VTOP_FLAGS_FIXNODES; }
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sub impotent($)		{ return $_[0]->flags() & $VTOP_FLAGS_IMPOTENT; }
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sub printdb($$)		{ print $_[1] if ($_[0]->verbose()); }

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# We name delay nodes internally as they are needed.
sub nextdelayname($)    { return "tbsdelay" . $_[0]->{'DELAYID'}++; }
# For when the user wants a specific delay os. Use a desire.
sub delay_desire($)	{ return $_[0]->option("delay_desire_string"); }
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# For XML
sub nextifacenumber($)  { return $_[0]->{'IFACEID'}++; }
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sub nextphostnumber($)  { return $_[0]->{'PHOSTID'}++; }
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# Virtual Types. 
sub virttypeisvtype($$) { return $_[0]->virt_vtypes()->Find($_[1]); }
sub VirtTypes($)        { return $_[0]->virt_vtypes()->Rows(); }

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# Results are stored until they are spit out in one of several formats.
sub addnode($$)		{ push(@{$_[0]->results()->{"nodes"}}, $_[1]); }
sub addlink($$)		{ push(@{$_[0]->results()->{"links"}}, $_[1]); }
sub addvclass($$)	{ push(@{$_[0]->results()->{"class"}}, $_[1]); }
sub addfixed($$)	{ push(@{$_[0]->results()->{"fixed"}}, $_[1]); }

# Caller will want these.
sub minimum_nodes($)    { return $_[0]->counter("minimum_nodes"); }
sub maximum_nodes($)    { return $_[0]->counter("maximum_nodes"); }
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sub plabcount($)	{ return $_[0]->counter("plabcount"); }
sub virtnodecount($)	{ return $_[0]->counter("virtcount"); }
sub simnodecount($)	{ return $_[0]->counter("simcount"); }
sub remotenodecount($)	{ return $_[0]->counter("remotecount"); }
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###############################################################################
# Virtual Nodes. A separate package so we can create objects for each one
# and then add local stuff to them.
#
package libvtop::virt_node;
use Carp;
use vars qw($AUTOLOAD);
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use overload ('""' => 'Stringify');
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# To avoid wrtting out all the methods.
sub AUTOLOAD {
    my $self = shift;
    my $type = ref($self) or croak "$self is not an object";

    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    if (@_) {
	return $self->{'HASH'}->{$name} = shift;
    }
    elsif (exists($self->{'HASH'}->{$name})) {
	return $self->{'HASH'}->{$name};
    }
    else {
	return $self->virt_node()->$name();
    }
}

#
# Wrap up a virt node.
#
sub Create($$$)
{
    my ($class, $vtop, $virt_node) = @_;

    my $self = {};
    bless($self, $class);

    $self->{'VIRTNODE'} = $virt_node;
    $self->{'VTOP'}     = $vtop;
    $self->{'HASH'}     = {};
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    return $self;
}
# accessors
sub virt_node($)	{ return $_[0]->{'VIRTNODE'}; }
sub vtop($)		{ return $_[0]->{'VTOP'}; }
sub hash($)		{ return $_[0]->{'HASH'}; }

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{'VIRTNODE'}   = undef;
    $self->{'VTOP'}       = undef;
    $self->{'HASH'}       = undef;
}

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sub Stringify($)
{
    my ($self) = @_;
    my $vname  = $self->vname();

    return "[vnode:$vname]";
}

###############################################################################
# Virtual Lans. This wraps up the virt_lan_lan table, and allows storing
# the members (virt_lans table entries).
#
package libvtop::virt_lan;
use Carp;
use vars qw($AUTOLOAD);
use overload ('""' => 'Stringify');

# To avoid wrtting out all the methods.
sub AUTOLOAD {
    my $self = shift;
    my $type = ref($self) or croak "$self is not an object";

    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    if (@_) {
	return $self->{'HASH'}->{$name} = shift;
    }
    elsif (exists($self->{'HASH'}->{$name})) {
	return $self->{'HASH'}->{$name};
    }
    else {
	return $self->virt_lanlan()->$name();
    }
}

#
# Wrap up a virt lan.
#
sub Create($$$$)
{
    my ($class, $vtop, $virt_lanlan) = @_;

    my $self = {};
    bless($self, $class);

    $self->{'VIRTLANLAN'}    = $virt_lanlan;
    $self->{'VTOP'}          = $vtop;
    $self->{'MEMBERS'}       = {};
    $self->{'SHAPEDMEMBERS'} = {};
    $self->{'HASH'}          = {};

    return $self;
}
# accessors
sub virt_lanlan($)	{ return $_[0]->{'VIRTLANLAN'}; }
sub members($)		{ return $_[0]->{'MEMBERS'}; }
sub memberlist($)       { return values(%{ $_[0]->members() }); }
sub shapedmembers($)	{ return $_[0]->{'SHAPEDMEMBERS'}; }
sub vtop($)		{ return $_[0]->{'VTOP'}; }
sub hash($)		{ return $_[0]->{'HASH'}; }

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{'VIRTLANLAN'} = undef;
    $self->{'MEMBERS'}    = undef;
    $self->{'VTOP'}       = undef;
    $self->{'HASH'}       = undef;
}

sub Stringify($)
{
    my ($self) = @_;
    my $vname  = $self->vname();

    return "[vlan:$vname]";
}

#
# Other support functions.
#
sub usevirtiface($)
{
    my ($self) = @_;
    my $encap  = $self->_encapstyle();

    return ($encap eq "veth" || $encap eq "veth-ne" || $encap eq "vlan");
}
sub membershaped($$) {
    my ($self, $member) = @_;
    return $self->shapedmembers()->{"$member"};
}
sub setmembershaped($$) {
    my ($self, $member) = @_;
    $self->shapedmembers()->{"$member"} = 1;
}

###############################################################################
# Virtual Lans Member. A separate package so we can create objects for
# each one and then add local stuff to them.
#
package libvtop::virt_lan_member;
use Carp;
use vars qw($AUTOLOAD);
use overload ('""' => 'Stringify');

# To avoid wrtting out all the methods.
sub AUTOLOAD {
    my $self = shift;
    my $type = ref($self) or croak "$self is not an object";

    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    if (@_) {
	return $self->{'HASH'}->{$name} = shift;
    }
    elsif (exists($self->{'HASH'}->{$name})) {
	return $self->{'HASH'}->{$name};
    }
    else {
	return $self->virt_member()->$name();
    }
}

#
# Wrap up a virt lan member.
#
sub Create($$$$)
{
    my ($class, $vtop, $virt_member, $virt_lan) = @_;

    my $self = {};
    bless($self, $class);

    $self->{'VIRTMEMBER'} = $virt_member;
    $self->{'VIRTLAN'}    = $virt_lan;
    $self->{'VIRTNODE'}   = $vtop->vnodes()->{$virt_member->vnode()};
    $self->{'VTOP'}       = $vtop;
    $self->{'HASH'}       = {};

    return $self;
}
# accessors
sub virt_member($)	{ return $_[0]->{'VIRTMEMBER'}; }
sub virt_lan($)		{ return $_[0]->{'VIRTLAN'}; }
sub virt_node($)	{ return $_[0]->{'VIRTNODE'}; }
sub vtop($)		{ return $_[0]->{'VTOP'}; }
sub hash($)		{ return $_[0]->{'HASH'}; }

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{'VIRTLAN'}    = undef;
    $self->{'VIRTNODE'}   = undef;
    $self->{'VIRTMEMBER'} = undef;
    $self->{'VTOP'}       = undef;
    $self->{'HASH'}       = undef;
}

sub Stringify($)
{
    my ($self) = @_;
    my $vnode  = $self->vnode();
    my $vport  = $self->vport();

    return "$vnode:$vport";
}


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#############################################################################
# Back to the main package.
#
package libvtop;

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#
# Load some physical info (for types, interfaces, speeds).
#
sub LoadPhysInfo($)
{
    my ($self) = @_;

    $self->printdb("Loading physical info\n");

    #
    # Interface capabilities, for getting speeds.
    #
    my %interface_capabilities = ();

    my $query_result =
	DBQueryWarn("select * from interface_capabilities");
    return -1
	if (!$query_result);

    while (my ($type, $capkey, $capval) = $query_result->fetchrow()) {
	$interface_capabilities{$type} = {}
  	    if (!defined($interface_capabilities{$type}));
	$interface_capabilities{$type}->{$capkey} = $capval;
    }

    #
    # Now get interface speeds for each type/class. We use this for
    # determining if a delay node is required. Very hacky, quite
    # wrong.
    #
    my %node_type_linkbw = ();
    
    # XXX: PlanetLab hack - PlanetLab 'control' interfaces are also
    # 'experimental' interfaces! We probably need a way to express
    # this in the interfaces table or interface_types
    #
    $query_result =
	DBQueryWarn("select distinct i.interface_type,n.type ".
		    "  from interfaces as i ".
		    "left join nodes as n on n.node_id=i.node_id ".
		    "where i.role='" . TBDB_IFACEROLE_EXPERIMENT . "' ".
		    "      or (n.type='pcplabphys' and i.role='" .
		                 TBDB_IFACEROLE_CONTROL . "')");
    return -1
	if (!$query_result);

    # XXX Special hack for sim nodes.
    $node_type_linkbw{"sim"} = {};

    while (my ($iface_type, $node_type) = $query_result->fetchrow()) {
	my $typeinfo = NodeType->Lookup($node_type);
	if (!defined($typeinfo)) {
	    carp("No type info for node type $node_type");
	    return -1;
	}
	my $node_class = $typeinfo->class();

	$node_type_linkbw{$node_type} = {}
	    if (!defined($node_type_linkbw{$node_type}));
	$node_type_linkbw{$node_class} = {}
	    if (!defined($node_type_linkbw{$node_class}));

	if (!defined($interface_capabilities{$iface_type}->{"protocols"})) {
	    carp("No protocols listed in capabilities for $iface_type!");
	    return -1;
	}
	my @protolist =
	    split(",", $interface_capabilities{$iface_type}->{"protocols"});

	foreach my $proto (@protolist) {
	    my $def_speed =
		$interface_capabilities{$iface_type}->{"${proto}_defspeed"};

	    if (!defined($def_speed)) {
		carp("No default speed in capabilites for $iface_type!");
		return -1;
	    }

	    my $auxspeeds =
		$interface_capabilities{$iface_type}->{"${proto}_auxspeeds"};
	    my @auxspeedlist = ();
	    if ($auxspeeds) {
		@auxspeedlist = split(",", $auxspeeds);
	    }

	    foreach my $speed ($def_speed, @auxspeedlist) {
		$node_type_linkbw{$node_type}{$proto}->{$speed} = 1;
		$node_type_linkbw{$node_class}{$proto}->{$speed} = 1;

		#
		# If the type/class has a non-zero simnode capacity, then add
		# entries for the interface speed so that requires_delay can
		# figure out interface speeds the underlying node type
		# supports.
		#
		if ($typeinfo->simnode_capacity()) {
		    $node_type_linkbw{"sim"}{$proto}->{$speed} = 1;
		}
	    }
	}
    }
    $self->{'IFACECAPS'}  = \%interface_capabilities;
    $self->{'TYPELINKBW'} = \%node_type_linkbw;
    
    return 0;
}
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sub interfacespeedmbps($$$)
{
    my ($self, $type, $which) = @_;
        
    return $self->{'IFACECAPS'}->{$type}->{"${which}_defspeed"}/1000.0;
}
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#
# When updating with fixednodes turned on, we need the current set
# of nodes that need to be fixed.
#
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sub LoadCurrentResources($)
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{
    my ($self) = @_;

    $self->counters()->{'reserved_simcount'}  = 0;
    $self->counters()->{'reserved_virtcount'} = 0;
    $self->counters()->{'reserved_physcount'} = 0;

    return 0
	if (!$self->fixcurrent());

    $self->printdb("Loading fixed nodes\n");

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    my @nodelist = $self->experiment()->NodeList(0, 1);
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    return 0
	if (!@nodelist);

    foreach my $pnode (@nodelist) {
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	my $vname   = $pnode->vname();
	my $node_id = $pnode->node_id();
	my $rsrv    = $pnode->ReservedTableEntry();

	# A list of vnodes on this pnode.
	$self->current_p2v()->{$pnode->phys_nodeid()} = []
	    if (! exists($self->current_p2v()->{$pnode->phys_nodeid()}));
	$self->pnodes()->{$node_id} = $pnode;

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	#
	# WIDEAREA nodes are going to break.
	#
	if ($pnode->isremotenode() &&
	    !$pnode->isplabdslice() && !$pnode->isdedicatedremote()) {
	    tberror("Cannot update widearea nodes yet!\n");
	    return -1;
	}
	if ($pnode->isvirtnode()) {
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	    $self->fixednodes()->{$vname} = $pnode->node_id();
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	    $self->counters()->{'reserved_virtcount'}++;
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	    # Get the underlying physical node.
	    my $ppnode = Node->Lookup($pnode->phys_nodeid());
	    if (!defined($ppnode)) {
		tberror("Cannot map $pnode to its real physnode");
		return -1;
	    }

	    #
	    # Record the mappings. 
	    #
	    $self->current_v2v()->{$vname} = $pnode;
	    $self->current_v2p()->{$vname} = $ppnode;
	    push(@{ $self->current_p2v()->{$ppnode->node_id()} }, $vname);
	    
	    # Mark the node as unused until later.
	    $pnode->_reuse("unused");
	    $ppnode->_reuse("unused");
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	}
	else {
	    #
	    # All the sim stuff is bit rotting cause no one understands it.
	    #
	    if ($rsrv->{'erole'} eq TBDB_RSRVROLE_SIMHOST) {
		tberror("Cannot update sim nodes yet!\n");
		return -1;
	    }
	    else {
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		$self->fixednodes()->{$vname} = $pnode->node_id();
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		$self->counters()->{'reserved_physcount'}++;
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		#
		# Record the mapping. 
		#
		$self->current_v2p()->{$vname} = $pnode;
		push(@{ $self->current_p2v()->{$node_id} }, $vname);
		# Mark the node as unused until later.
		$pnode->_reuse("unused");

		$self->printdb("current v2p: $node_id -> $vname\n");
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	    }
	}
    }
    return 0;
}

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sub LoadVirtNodes($)
{
    my ($self) = @_;

    $self->printdb("Loading virtual nodes\n");

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    my $pid    = $self->pid();
    my $eid    = $self->eid();
    my $table  = $self->virt_nodes();

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    foreach my $virt_node ($table->Rows()) {
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	my $vnode    = libvtop::virt_node->Create($self, $virt_node);
	my $vname    = $vnode->vname();
	my $desires  = {};
	my $startloc = undef;
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	# Other fields we need.
	my $ips     = $vnode->ips();
	my $type    = $vnode->type();
	my $fixed   = $vnode->fixed();
	my $osname  = $vnode->osname();

	# XXX
	# If its a vtype, there will not be any node_type data. This
	# can break things, if one were to mix a virt/remote type with
	# a nonvirt/local type! Need to actually verify the vtypes
	# for consistency. 
	#
	my $isremote= 0;
	my $isvirt  = 0;
	my $issub   = 0;
	my $isplab  = 0;
	my $issim   = 0;
	my $isdyn   = 0;	# Only virtnodes are dynamic.
653
	my $isvtyped= 0;
654
	my $isded   = 0;
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674

	# If we have a real type or auxtype ...
	my $nodetype = NodeType->LookupAny($type);
	if (!defined($nodetype)) {
	    my $vtype = $self->virttypeisvtype($type);
	    if (!defined($vtype)) {
		carp("Improper type $type for node $vnode!");
		return -1;
	    }
	    #
	    # For now, just pick the first member type.
	    #
	    my @memberlist = split(" ", $vtype->members());
	    my $vtypename  = $memberlist[0];

	    $nodetype = NodeType->LookupAny($vtypename);
	    if (!defined($nodetype)) {
		carp("Improper type $vtypename in vtypes for node $vnode!");
		return -1;
	    }
675
	    $isvtyped = 1;
676
	}
677 678
	$vnode->_typeinfo($nodetype);
	
679 680 681 682 683 684
	$isremote = $nodetype->isremotenode();
	$isvirt   = $nodetype->isvirtnode();
	$issub    = $nodetype->issubnode();
	$isplab   = $nodetype->isplabdslice();
	$issim    = $nodetype->issimnode();
	$isdyn    = $nodetype->isdynamic();
685
	$isded    = $nodetype->isdedicatedremote();
686

687 688 689
	# Mark this as being a virtual typed node.
	$vnode->_isvtyped($isvtyped);

690 691 692 693 694 695 696 697
	# All this info is stashed in our local object.
	$vnode->_nodeweight(undef);
	$vnode->_isremotenode($isremote);
	$vnode->_isvirtnode($isvirt);
	$vnode->_issubnode($issub);
	$vnode->_isplabnode($isplab);
	$vnode->_issimnode($issim);
	$vnode->_isdynamic($isdyn);
698
	$vnode->_isdedremote($isded);
699

700 701
	# The mapped osname to actual osinfo structure.
	$vnode->_osinfo(undef);
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
	# Eventual physical mapping. 
	$vnode->_physnode(undef);
	# Handy to combine these.
	$vnode->_settings([ $vnode->cmd_line(),
			    $vnode->rpms(),
			    $vnode->startupcmd(),
			    $vnode->tarfiles(),
			    $vnode->failureaction(),
			    $vnode->routertype() ]);

	#
	# If a subnode, kill the fixed mapping. That was just to
	# tell us the connection. We do not want to overload "fixed"
	# within assign wrapper since its already overloaded.
	#
	if ($issub) {
	    # Must be a parent. Set in the parser, either explicitly, or else
	    # one is created if the user leaves it out.
	    if (!defined($fixed) || $fixed eq "") {
		carp("Subnode $vname must be fixed to its parent!");
		return -1;
	    }
	    $vnode->_parent($fixed);
	    $vnode->fixed("");
	    undef($fixed);
	}

	# Can fixed really get set to ""?
	if (defined($fixed) && $fixed ne "") {
731
	    # Store the name since we use FIXED_NODES for delay nodes too.
732
	    $self->fixednodes()->{$vname} = $fixed;
733 734 735 736 737 738 739
	}

	$self->printdb("  $vname type:$type ips:$ips\n");
	$self->printdb("         isrem:$isremote isvirt:$isvirt ");
	$self->printdb("fixed:$fixed")
	    if (defined($fixed));
	$self->printdb("\n");
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
	
	# We need to check the names to make sure they do not clash with
	# our internal delay node names.
	if (($vname =~ /^tbdelay\d+/) ||
	    ($vname =~ /^tbsdelay\d+/)) {
	    print "Warning: $vname is a reserved name. Working around it.\n";
	    my ($num) = ($vname =~ /(\d+)/);
	    $self->delayid($num + 1);
	}

	$self->{'COUNTERS'}->{'simcount'}++
	    if ($issim);
	$self->{'COUNTERS'}->{'remotecount'}++
	    if ($isremote);
	$self->{'COUNTERS'}->{'virtcount'}++
	    if ($isvirt);
	$self->{'COUNTERS'}->{'plabcount'}++
	    if ($isplab);
	$self->{'COUNTERS'}->{'physcount'}++
	    if (!$issim && !$isvirt);

	# stats
	my @iplist  = split(" ", $ips);
	my $ipcount = scalar(@iplist);

	$self->exptstats()->{"maxlinks"} = $ipcount
	    if ($ipcount > $self->exptstats()->{"maxlinks"});
	$self->exptstats()->{"minlinks"} = $ipcount
	    if ($ipcount < $self->exptstats()->{"minlinks"});

	# Take apart the IP list.
	foreach my $ipinfo (@iplist) {
	    my ($port,$ip) = split(":",$ipinfo);
	    
	    $self->{'IPS'}->{"$vname:$port"} = $ip;
	}

	#
	# Map the osname to an OSID now so that we can check max_concurrent.
	# This also avoids the work and *check* later after we have done 90%
	# of assign_wrapper. If no osname was specified, we have to wait and
	# use the default for the type of phys node that assign picks.
	#
	if (defined($osname) && $osname ne "") {
	    my $osinfo = OSinfo->Lookup("$pid,$osname");
	    if (!defined($osinfo)) {
		$osinfo = OSinfo->LookupByName($osname);

		if (!defined($osinfo)) {
		    tberror({cause => 'user', type => 'primary',
			     severity => SEV_ERROR,
			     error => ['invalid_os', undef, $osname, $pid]},
			    "Invalid OS $osname in project $pid!");
		    return -1;
		}
	    }
	    $vnode->_osinfo($osinfo);
	}

	#
	# Add in desires.
	#
	foreach my $desire ($self->virt_desires()->Rows()) {
	    next
		if ($desire->vname() ne $vname);
	    $desires->{$desire->desire()} = $desire->weight();
	}
	$vnode->_desires($desires);

	#
	# And the startloc, but doubt this is used anymore.
	#
	foreach my $startloc ($self->virt_startloc()->Rows()) {
	    if ($startloc->vname() eq $vname) {
		$startloc = $startloc->building();
		last;
	    }
	}
	$vnode->_startloc($startloc);

	# Add to the list.
	$self->{'VNODES'}->{$vname} = $vnode;
    }
    return 0;
}

sub LoadVirtLans($)
{
    my ($self) = @_;

    $self->printdb("Loading virtual lans\n");

    my $pid    = $self->pid();
    my $eid    = $self->eid();
    my $table  = $self->virt_lans();

    foreach my $virt_lan_member ($table->Rows()) {
	my $vlanname = $virt_lan_member->vname();

	# Local wrapper for virt_lan_lan table entry (the "lan").
	my $virtlan = $self->vlans()->{$vlanname};
	if (!defined($virtlan)) {
	    my $virt_lan_lan = $self->virt_lan_lans()->Find($vlanname);
	    $virtlan = libvtop::virt_lan->Create($self, $virt_lan_lan);
	    # Add it to the toplevel list of lans.
	    $self->vlans()->{$vlanname} = $virtlan;
846
	    $virtlan->_accesspoint(undef);
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
	}

	# Now the local wrapper for the virt_lan table entry (the "member").
	my $vlanmember = libvtop::virt_lan_member->Create($self,
							  $virt_lan_member,
							  $virtlan);

	# Which we add to the member hash for the lan by vnode:vport
	# Note that $vlanmember->member() returns vnode:port.
	$virtlan->members()->{$vlanmember->member()} = $vlanmember;

	# Global map from vnode:port back to the lan object
	$self->memberof()->{$vlanmember->member()} = $virtlan;

	# Other fields we need below
	my $delay          = $vlanmember->delay();
	my $bandwidth      = $vlanmember->bandwidth();
	my $est_bandwidth  = $vlanmember->est_bandwidth();
	my $lossrate       = $vlanmember->lossrate();
	my $rdelay         = $vlanmember->rdelay();
	my $rbandwidth     = $vlanmember->rbandwidth();
	my $rest_bandwidth = $vlanmember->rest_bandwidth();
	my $rlossrate      = $vlanmember->rlossrate();
	my $widearea       = $vlanmember->widearea();
	my $isemulated     = $vlanmember->emulated();
	my $uselinkdelay   = $vlanmember->uselinkdelay();
	my $nobwshaping    = $vlanmember->nobwshaping();
	my $trivial_ok     = $vlanmember->trivial_ok();
	my $protocol       = $vlanmember->protocol();
	my $mustdelay      = $vlanmember->mustdelay();
	my $encap          = $vlanmember->encap_style();
	my $mask           = $vlanmember->mask();

	#
	# So all this stuff is really per-lan state, but an artifact of
	# the original implementation is that it is duplicated in every
	# single member row. So, push the info up a level to make it easy
	# to figure out how each lan is set up.
	#

	# If RED, must insert traffic shapping.
	$virtlan->_mustdelay($mustdelay);
	# User has requested the link/lan be emulated. Not typical.
	$virtlan->_emulated($isemulated);
	# User has requested "endnodeshaping" (dummynet on end nodes).
	$virtlan->_uselinkdelay($uselinkdelay);
        # The nobwshaping flag is used in conjunction with emulated
        # links to turn off actual bw traffic shaping on an emulated
        # link. This allows assign to match the specified bws, but not
        # force them to be such with delay nodes (leaves it up to the
        # user to moderate the bw).
	$virtlan->_nobwshaping($nobwshaping);
	$virtlan->_encapstyle($encap);
	# User has said that colocating is okay. Not typical.
	$virtlan->_trivial_ok($trivial_ok);
	# Link is connected to a remote node, and gets a tunnel.
	$virtlan->_tunnel(0);
	# Netmask for the entire lan.
	$virtlan->_mask($mask);
	$virtlan->_widearea($widearea);
	# Whether all member nodes are simulated
	$virtlan->_allsim(0);
	$virtlan->_protocol($protocol);
	$virtlan->_accesspoint($vlanmember)
	    if ($vlanmember->is_accesspoint());

	if (defined($encap) &&
	    ($encap eq "vtun" || $encap eq "gre" || $encap eq "egre")) {
	    $virtlan->_tunnel(1);
	}

	# Store this stuff as a unit to make it easier to grab later.
	$vlanmember->_delayinfo([ $delay,
				  $bandwidth,
				  $est_bandwidth,
				  $lossrate,
				  $rdelay,
				  $rbandwidth,
				  $rest_bandwidth,
				  $rlossrate ]);

	#
	# Ditto for the Q stuff, which is not needed until the delay
	# links are created. There are no "r" params either; Queue
	# stuff is handled in just the to-switch direction.
	#
	$vlanmember->_queueinfo([$vlanmember->q_limit(),
				 $vlanmember->q_maxthresh(),
				 $vlanmember->q_minthresh(),
				 $vlanmember->q_weight(),
				 $vlanmember->q_linterm(),
				 $vlanmember->q_qinbytes(),
				 $vlanmember->q_bytes(),
				 $vlanmember->q_meanpsize(),
				 $vlanmember->q_wait(),
				 $vlanmember->q_setbit(),
				 $vlanmember->q_droptail(),
				 $vlanmember->q_red(),
				 $vlanmember->q_gentle() ]);

	#
	# The trace info is stored along with the QUEUEINFO, but its
	# easier if I split it out.
	#
	$vlanmember->_traceinfo([$vlanmember->traced(),
				 $vlanmember->trace_endnode(),
				 $vlanmember->trace_type(),
				 $vlanmember->trace_expr(),
				 $vlanmember->trace_snaplen(),
				 $vlanmember->trace_db() ]);

	#
	# This will get set on a per-member basis when it is determined
	# that the link is getting a delaynode cause its really being
	# shaped, or because it is being traced or monitored.
	#
	$virtlan->shapedmembers()->{"$vlanmember"} = 0;
	$virtlan->_delayed(0);

	#
	# XXX - Whenever a delay node is inserted, port speeds are set to
	#       the next fastest interface type we have, even if they requested
	#       exactly some speed that can be done without a delay node such
	#       as 10Mbs or 100Mbs. This is a simplification. At some point we
	#       might want to force all the ports along the way to 10Mbs, and
	#       have the delay node worry about delay only, and not bandwidth.
	#       That will be harder to to do in this mess. See companion XXX
	#       below where the delays table is initialized. Initially, we set
	#       the speed to 10Mbs, if a delay node is insterted below, it
	#       resets this to 100Mbs.
	#
	my $portbw = $self->getbandwidth($vlanmember, $virtlan, $bandwidth);
	$self->portbw()->{"$vlanmember"} = $portbw;
	
	$self->printdb("  $vlanname $vlanmember portbw:$portbw - ".
		       "$delay $bandwidth $lossrate ".
		       "$rdelay $rbandwidth $rlossrate\n");
    }
    return 0;
}

988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
#
# Dump the vtype list.
#
sub GenVirtTypes($)
{
    my ($self) = @_;
    my @types  = $self->VirtTypes();
    
    foreach my $vtype (@types) {
	my $name    = $vtype->name();
	my $weight  = $vtype->weight();
	my @members = split(" ", $vtype->members());

	$self->addvclass("$name $weight @members");
    }
    return 0;
}

1006 1007 1008
#
# Dump the virt nodes.
#
1009
sub GenVirtNodes($)
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
{
    my ($self) = @_;
    my $experiment = $self->experiment();
    my $pid    = $experiment->pid();
    my $eid    = $experiment->eid();

    foreach my $vnode (values(%{ $self->{'VNODES'} })) {
	my $vname = $vnode->vname();
	my $type  = $vnode->type();

	my $subnodestr = "";
	if ($vnode->_issubnode()) {
	    my $parent  = $vnode->_parent();
	    $subnodestr = "subnode_of:$parent";
	}
	my $desirestr = "";
	foreach my $desirename (keys(%{ $vnode->_desires() })) {
	    my $weight = $vnode->_desires()->{$desirename};
	    $desirestr .= " "
		if ($desirestr ne "");
	    $desirestr .= "$desirename:" . sprintf("%f",$weight);
	}
	if ($vnode->_isplabnode() && $experiment->cpu_usage()) {
	    # Yuck
	    $desirestr .= " +load:" . (($experiment->cpu_usage() - 1) / 5.0);
	}
	if ($self->updating()) {
	    $desirestr .= " already_reserved:.2";
	}
	if (defined($vnode->_startloc())) {
	    $desirestr .= " area-" . $vnode->_startloc() . ":1";
	}
	# Require that this vnode be placed onto a pnode that supports
	# the OS it is going to run. However, if the OS is one with a
	# 'path' (like an OSKit kernel), we don't have an entry in
	# osidtoimageid for it, and thus we leave it off of the desire list
	if (defined($vnode->_osinfo())) {
	    my $osinfo = $vnode->_osinfo();

	    if (!defined($osinfo->path()) || $osinfo->path() eq "") {
		$desirestr .= " OS-" . $osinfo->osid() . ":1";
	    }
	}

	#
	# Now the type string, which might include some stuff for
	# simnodes that I do not understand. 
	#
	my $typestr = $type;
	if ($vnode->_issimnode()) {
	    my $query_result =
		DBQueryWarn("select nodeweight from virt_simnode_attributes ".
			    "where pid='$pid' and eid='$eid' and ".
			    "      vname='$vname'");
	    if ($query_result && $query_result->numrows) {
		my ($nodeweight) = $query_result->fetchrow_array();
		if ($nodeweight) {
		    $typestr = "$type:$nodeweight";
		}
	    }
	}
1071
	$self->addnode("$vname $typestr $subnodestr $desirestr");
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
    }

    #
    # Now that the node list is out, set OSID for nodes
    #
    # Huh?
    #
    foreach my $vnode (values(%{ $self->{'VNODES'} })) {
	my $vname  = $vnode->vname();
	my $type   = $vnode->type();
	my $osinfo = $vnode->_osinfo();

	if ($vnode->_issubnode() && $type eq "ixp-bveil" && !defined($osinfo)){
	    my $osinfo = OSinfo->LookupByName("RHL73-IXPHOST");
	    $vnode->_osinfo($osinfo);
	}
    }
    return 0;
}

#
# Print out the fix nodes.
#
1095
sub GenFixNodes($)
1096 1097 1098 1099 1100 1101 1102 1103
{
    my ($self) = @_;

    #
    # Be sure NOT to print out nodes which are no longer in the experiment.
    #
    # XXX This must be done last since we create internal nodes above.
    #
1104 1105
    foreach my $vname (keys(%{ $self->fixednodes() })) {
	my $fixed = $self->fixednodes()->{$vname};
1106 1107
	
	if ($self->isatoponode($vname) || $self->isadelaynode($vname)) {
1108
	    $self->addfixed("$vname $fixed");
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
	}
    }
    return 0;
}

#
# Print out some summary stats.
#
sub PrintSummaryStats($)
{
    my ($self) = @_;

    # Set estimations
    my $minimum_nodes = $self->counters()->{'physcount'} +
	$self->delaynodecount() / $self->options()->{'delay_capacity'};
    my $maximum_nodes = $self->counters()->{'physcount'} +
	$self->delaynodecount();
    $minimum_nodes = POSIX::ceil($minimum_nodes);

1128 1129 1130 1131
    # For the caller.
    $self->counters()->{'minimum_nodes'}  = $minimum_nodes;
    $self->counters()->{'maximum_nodes'}  = $maximum_nodes;

1132 1133
    my $virtnode_count = $self->counters()->{'virtcount'};
    my $simnode_count  = $self->counters()->{'simcount'};
1134 1135
    my $reserved_virtcount = $self->counters()->{'reserved_virtcount'};
    my $reserved_physcount = $self->counters()->{'reserved_physcount'};
1136 1137 1138 1139

    print "Minimum nodes   = $minimum_nodes\n";
    print "Maximum nodes   = $maximum_nodes\n";
    if ($virtnode_count) {
1140
	print "Virtual nodes     = $virtnode_count\n";
1141 1142 1143 1144
    }
    if ($simnode_count) {
	print "Simulated nodes   = $simnode_count\n";
    }
1145 1146 1147 1148 1149 1150
    if ($reserved_virtcount) {
	print "Reserved vnodes   = $reserved_virtcount\n";
    }
    if ($reserved_physcount) {
	print "Reserved pnodes   = $reserved_physcount\n";
    }
1151 1152 1153 1154 1155 1156
    return 0;
}

#
# Dump the virt lans
#
1157
sub GenVirtLans($)
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
{
    my ($self) = @_;
    my $experiment = $self->experiment();
    my $pid    = $experiment->pid();
    my $eid    = $experiment->eid();

    my $errors	         = 0;
    my %osdoesveth       = ();
    my %osdoesvlan       = ();
    my %osdoesmlink      = ();
    my %osdoeslinkdelays = ();

    foreach my $vlan (values(%{ $self->{'VLANS'} })) {
	my $vname = $vlan->vname();

	# Tunnels are handled elsewhere.
	next
	    if ($vlan->_tunnel());

	my @members = $vlan->memberlist();
	$self->printdb("$vname: " . join(" ",@members) . "\n");
	
	my $simnodes     = 0;
	my $realnodes    = 0;
	my $virtnodes    = 0;
	my $nonvirtnodes = 0;
	my %nodesdo      = ("alias"=>0, "veth"=>0, "vlan"=>0, "ldelay"=>0);
	my $trivial_ok   = 0;
	my $emulated     = $vlan->_emulated();
        my $uselinkdelay = $vlan->_uselinkdelay();
	my $mustdelay    = $vlan->_mustdelay();
	my $nobwshaping  = $vlan->_nobwshaping();
	my $protocol     = $vlan->_protocol();
	my $encap        = $vlan->_encapstyle();

	#
	# Count the types of nodes (simulated, virtual, real, etc.) in this
	# LAN
	#
	foreach my $member (@members) {
	    my $osid;
	    my $virtnode = $member->virt_node();

	    if ($virtnode->_issimnode()) {
		$simnodes++;

		if (defined($virtnode->_osinfo())) {
		    $osid = $virtnode->_osinfo()->osid();
		} else {
		    $osid = "<SIM>";
		}
		# XXX apparently all simnodes can do veths
		if (!exists($osdoesmlink{$osid})) {
		    $osdoesmlink{$osid} = 0;
		    $osdoesveth{$osid} = 1;
		    $osdoesvlan{$osid} = 0;
		    $osdoeslinkdelays{$osid} = 1;
		}
	    } else {
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		if ($virtnode->_isvirtnode() && $virtnode->type() ne "pcfed") {
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		    $virtnodes++;

		    # XXX virtnodes are always BSD at the moment
		    $osid = "<JAIL>";
		    if (!exists($osdoesmlink{$osid})) {
			$osdoesmlink{$osid} = 0;
			$osdoesveth{$osid} = 1;
			$osdoesvlan{$osid} = 1;
			$osdoeslinkdelays{$osid} = 1;
		    }
		} else {
		    $nonvirtnodes++;
		    #
		    # Check os feature list emulated/veth/vlan support.
		    #
		    if (defined($virtnode->_osinfo())) {
			my $osinfo = $virtnode->_osinfo();
			$osid = $osinfo->osid();
			
			if (!exists($osdoesmlink{$osid})) {
			    $osdoesmlink{$osid} =
				$osinfo->FeatureSupported('mlinks');
			    $osdoesveth{$osid} =
				$osinfo->FeatureSupported('veths');
			    $osdoesvlan{$osid} =
				$osinfo->FeatureSupported('vlans');
			    # Need this for phys nodes requesting lindelays.
			    $osdoeslinkdelays{$osid} =
				$osinfo->FeatureSupported('linkdelays');
			}
		    } else {
			# XXX If the user doesn't explicitly set an OS on a PC.
			# Be conservative and assume minimum features.
			$osid = "<DEFAULT>";
			if (!exists($osdoesmlink{$osid})) {
			    $osdoesmlink{$osid} = 0;
			    $osdoesveth{$osid} = 0;
			    $osdoesvlan{$osid} = 0;
			    $osdoeslinkdelays{$osid} = 0;
			}
		    }
		}
		$realnodes++;
	    }

	    # Figure out how many nodes support a feature
	    $nodesdo{"alias"}++
		if ($osdoesmlink{$osid});
	    $nodesdo{"veth"}++
		if ($osdoesveth{$osid});
	    $nodesdo{"vlan"}++
		if ($osdoesvlan{$osid});
	    $nodesdo{"ldelay"}++
		if ($osdoeslinkdelays{$osid});
	}
	$nodesdo{"veth-ne"} = $nodesdo{"veth"};

	$self->printdb("$vname: members = ".
		       scalar(@members) .
		       " real/virt/sim = ".
		       "$nonvirtnodes/$virtnodes/$simnodes ".
		       "mlink/veth/vlan/ldelay = ".
		       $nodesdo{"alias"} . "/".
		       $nodesdo{"veth"} . "/".
		       $nodesdo{"vlan"} . "/".
		       $nodesdo{"ldelay"} . "\n");

	#
	# Determine the emulation/encapsulation style for the link.
	# The goal is to come up with a compatible emulation style
	# for all members of the virt_lan.  Note that it is not stictly
	# necessary for all members of the virt_lan to emulate in the
	# same way; e.g., one node could be doing an 802.1q tagged VLAN
	# while another could just be doing IP aliasing or veths without
	# encapsulation.  In fact, it is not even necesary in some cases
	# for all vlinks on a physical link to use the same style!
	# But we don't want to go there right now, so for simplicity,
	# we require that the user specify identical values for all
	# members of a virt_lan.  For now, we do this by ignoring per-link
	# settings ($encap) and using only the global setting ($encapstyle)
	# except for backward compat (see next paragraph).
	#
	# XXX this is made hideous by having both global and per-link
	# encapsulation values that were previously used for two
	# different purposes.  The per-link value was used to
	# specify using "veth" devices for non-vnode emulated links
	# (as opposed to using IP aliases).  The global value
	# was used to specify using veth devices without encapsulation
	# for vnode emulated links.
	#
	# So the simplified semantics look like:
	#
	# global  per-link  in vnode?  meaning
	#
	# default default   no         alias; non-vnode mpx links (historic)
	# default alias     no         alias; non-vnode mpx links (historic)
	# default veth      no         veth; non-vnode mpx links (historic)
	#
	# default default   yes        veth; vnode vlinks (historic)
	# veth    default   yes        veth; vnode vlinks (historic)
	# veth-ne default   yes        veth-noencap; vnode vlinks (historic)
	#
	# default *         yes        veth
	# default *         no         alias
	# alias   *         yes        ERROR; we could support this
	# alias   *         no         alias
	# veth    *         *          veth
	# veth-ne *         *          veth-noencap
	# vlan    *         *          vlan
	#
	my $encapval;

        #
	# Notes on virtual interfaces.
	#
	# If a link is EMULATED (virtlanemulated) then it will have an
	# "encapsulation style" (virtlanencapstyle).  That value is
	# one of:
	#
	# "alias"	emulation is done with IP aliases on a physical
	#               interface; there is no packet encapsulation. Works on
	#		FreeBSD or Linux.
	#
	# "veth"	emulation is done with "veth" virtual devices;
	#		encapsulation is standard veth style.
	#		Works on FreeBSD only.
	#
	# "veth-ne"	emulation is done with "veth" devices;
	#		no encapsulation is used (uses made-up MAC addresses
	#		instead).
	#		Works on FreeBSD only.
	#
	# "vlan"	emulation is done with "vlan" devices;
	#		uses 802.1q VLAN tagging.
	#		Works on FreeBSD or Linux.
	#
	# "default"	emulation style was not explicitly set by the users;
	#		encap style depends on context ("veth" for vnode,
	#		"alias" ow)
	#
	# Note that the encapsulation style for "default" depends on
	# the node type.  For non-vnodes the default is "alias".  For
	# vnodes the default is "veth" since they must always have
	# some pseudo-device on which to hang a route table ID; i.e.,
	# we cannot just do IP aliasing.
	#
	#
        # Encapsulation can be specified per link.  The default link
        # encapsulation can also be specified by a per-experiment
        # setting.  At the moment, only the latter (global) is
        # implemented.
        #
	my $encapstyle = $experiment->encap_style();

	#
	# Historic case O: if simulated nodes are involved, use veth
	# as necessary.  XXX don't know if this is correct in all cases!
	#
	if ($simnodes > 0) {
	    $encapval = "veth";
	}
	#
	# Historic case I: non-vnode emulated links use IP aliases 
	# unless per-link value is 'veth', in which case veths are used.
	# This is currently the only place where we care about the
	# per-link value.
	#
	elsif ($encapstyle eq "default" && $virtnodes == 0) {
	    if ($encap eq "veth") {
		$encapval = "veth";
	    } else {
		$encapval = "alias";
	    }
	}
	#
	# Historic case II: vnode emulated links use veth devices with
	# encapsulation unless global encap is set to 'veth-ne'.
	#
	elsif ($encap eq "default" && $virtnodes > 0) {
	    if ($encapstyle eq "default" || $encapstyle eq "veth") {
		$encapval = "veth";
	    } elsif ($encapstyle eq "veth-ne") {
		$encapval = "veth-ne";
	    }
	}

	if (!defined($encapval)) {
	    if ($encapstyle eq "default") {
		# must involve vnodes, non-vnodes handled in "case I" above
		$encapval = "veth";
	    } elsif ($encapstyle =~ /^(alias|veth|veth-ne|vlan)$/) {
		$encapval = $encapstyle;
	    } else {
		tberror("unknown encapsulation style '$encapstyle'\n");
		$errors++;
	    }
	    if ($encap ne "default" && $encap ne $encapval) {
		tbwarn("per-link emulation style not supported right now".
		       "'$encap' overridden by global '$encapval'");
	    }
	}

	$self->printdb("$vname: global/link = ".
		       "$encapstyle/$encap => $encapval\n");

	#
	# Ensure the per-link value is set correctly for emulated links.
	#
	if ($emulated) {
	    $vlan->_encapstyle($encapval);
	}

	#
	# For links involving virtnodes, we prefer to use virtual links.
	# But we can only do this if all involved nodes support a common
	# emulation style.
	#
	my $allnodes = $simnodes + $realnodes;
	if ($virtnodes > 0) {
	    $trivial_ok = $vlan->_trivial_ok();

	    if ($nodesdo{$encapval} == $allnodes) {
		#
		# All members support the encapsulation style, use it.
		#
		$emulated = 1;
		$vlan->_emulated(1);
		$vlan->_encapstyle($encapval);
	    } else {
		#
		# Not all members support the desired encapsulation.
		# This means we have to turn off emulation options
		# even if the user explicitly asked for them.
		# If the user had explicitly asked for these, we
		# print a warning.
		#
		if ($emulated) {
		    tbwarn "tb-set-multiplexed not supported on ".
			   "$vname since at least one of the nodes in $vname ".
			   "does not support multiplexed links.";
		}
		if ($vlan->usevirtiface()) {
		    tbwarn "tb-set-vlink-emulation not supported on ".
	         	   "$vname since at least one of the nodes in $vname ".
			   "does not support '$encapval' link emulation\n";
		}
		$emulated = 0;
		$vlan->_emulated(0);
		$vlan->_encapstyle("none");

		# cannot do colocated vnode trivial links without veths
		$trivial_ok = 0;
	    }
	}
	elsif ($simnodes > 0 && $realnodes == 0) {
	    #
	    # If all nodes in a lan/link are simulated, the lan/link
	    # could certainly be hosted on the same physical
	    # node. Also, if the lan/link is cut and members mapped to
	    # different physical nodes, we will use emulated links
	    # i.e. veth devices.
	    #
	    $trivial_ok = 1;
	    $emulated = 1;
	    $vlan->_emulated(1);
	    $vlan->_encapstyle("veth");
	    $vlan->_allsim(1);
	}

	if ($protocol !~ /^ethernet/) {
	    #
	    # This arrangement is temporary. For now, if its not a
	    # regular ethernet, then create a lan attached to a fake
	    # switch. See ptopgen.  We label them differently though,
	    # since these do not get vlans.  Some other special
	    # treatment applies as well.
	    #
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	    $self->addnode("fakelan/$vname $protocol");
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	    # So we ignore it when it comes back from assign.
	    $self->lannodes()->{"fakelan/$vname"} = 1;
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Leigh B. Stoller committed
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	    # XXX If not ethernet, assume wireless. Need more info someplace.
	    $self->exptstats()->{'wirelesslans'} += 1;
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	    foreach my $member (@members) {
		my $plink = "fakelan/$vname/$member";
		my $vnode = $member->virt_node()->vname();
		    
		my ($top_bw, $top_rbw) = $self->virtlantopbw($vlan, $member);
	
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		$self->addlink("$plink $vnode fakelan/$vname $top_bw " .
			       "0 0 $protocol");
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