#!/usr/bin/perl -w

use strict;
use PVE::QemuServer;
use PVE::Tools qw(run_command);

my $iface = shift;

die "no interface specified\n" if !$iface;

die "got strange interface name '$iface'\n" 
    if $iface !~ m/^tap(\d+)i(\d+)$/;

my $vmid = $1;
my $netid = "net$2";

my $conf = PVE::QemuServer::load_config ($vmid);

die "unable to get network config '$netid'\n"
    if !$conf->{$netid};

my $net = PVE::QemuServer::parse_net($conf->{$netid});
die "unable to parse network config '$netid'\n" if !$net;

my $bridge = $net->{bridge};
die "unable to get bridge setting\n" if !$bridge;

system ("/sbin/ifconfig $iface 0.0.0.0 promisc up") == 0 ||
    die "interface activation failed\n";

if ($net->{rate}) {

    my $rate = int($net->{rate}*1024*1024);
    my $burst = 1024*1024;

    system("/sbin/tc qdisc del dev $iface ingres >/dev/null 2>&1");
    system("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1");

    run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress");

    # this does not work wit virtio - don't know why
    #run_command("/sbin/tc filter add dev $iface parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate ${rate}bps burst ${burst}b drop flowid :1");
    # so we use avrate instead
    run_command("/sbin/tc filter add dev $iface parent ffff: " .
		"protocol ip prio 50 estimator 1sec 8sec " .
		"u32 match ip src 0.0.0.0/0 police avrate ${rate}bps drop flowid :1");

    # tbf does not work for unknown reason
    #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST
    # so we use htb instead
    run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1");
    run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " .
		"htb rate ${rate}bps burst ${burst}b");

    # enable this to debug tc
    if (0) {
	print "DEBUG tc settings\n";
	system("/sbin/tc qdisc ls dev $iface");
	system("/sbin/tc class ls dev $iface");
	system("/sbin/tc filter ls dev $iface parent ffff:");
    }

}

system ("/usr/sbin/brctl addif $bridge $iface") == 0 ||
    die "can't add interface to bridge\n";

exit 0;