Add script to add ETF and pfast qdiscs

scripts/create_qdisc

+#!/bin/bash
+
+usage() {
+  echo "Usage: $0 -e delta|-p" 1>&2;
+  exit 1;
+}
+
+while getopts "e:p" opt; do
+  case "${opt}" in
+    e )
+        delta=${OPTARG}
+        use_etf=1
+        ;;
+    p )
+        use_pfast=1
+      ;;
+    * )
+        usage
+      ;;
+  esac
+done
+
+shift $((OPTIND-1))
+if [ -z "${use_etf}" ] && [ -z "${use_pfast}" ]; then
+  usage
+fi
+if [ -n "${use_etf}" ] && [ -n "${use_pfast}" ]; then
+  usage
+fi
+
+if [ -n "${use_etf}" ]; then
+  echo "Creating ETF qdisc with delta $delta"
+  tc qdisc del root dev eth0;
+  tc qdisc add dev eth0 parent root handle 100 prio bands 2 priomap 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1;
+  tc qdisc add dev eth0 parent 100:1 etf clockid CLOCK_TAI delta $delta;
+  tc qdisc show dev eth0;
+elif [ -n "${use_pfast}" ]; then
+  echo "Creating pfast qdisc"
+  tc qdisc del root dev eth0;
+  tc qdisc show;
+fi