+sub setup_tc_rate_limit {
+ my ($iface, $rate, $burst, $debug) = @_;
+
+ 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 ${burst}b");
+
+ if ($debug) {
+ 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:");
+ }
+}
+
+