can-tc-init-etf: add example script to setup queuing for etf

GNUmakefile.am

@@ -106,6 +106,7 @@ EXTRA_DIST += \
 	autogen.sh \
 	can-j1939-kickstart.md \
 	can-j1939.md \
+	can-tc-init-etf.sh \
 	mcp251xfd/99-devcoredump.rules \
 	mcp251xfd/devcoredump
 

can-tc-init-etf.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2022 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
+
+set -e
+
+IFACE=${1:-can0}
+MARK=${2:-1}
+
+clear() {
+    tc -batch - <<EOF
+
+qdisc replace dev ${IFACE} root pfifo_fast
+
+EOF
+}
+
+show() {
+    tc -batch - <<EOF
+
+qdisc show dev ${IFACE}
+filter show dev ${IFACE}
+
+EOF
+}
+
+prio_etf_mark() {
+    tc -batch - <<EOF
+
+qdisc replace dev ${IFACE} parent root handle 100 prio \
+	bands 3
+
+qdisc replace dev ${IFACE} handle 1001 parent 100:1 etf clockid CLOCK_TAI \
+	delta 200000
+
+qdisc replace dev ${IFACE} handle 1002 parent 100:3 pfifo_fast
+
+filter add dev ${IFACE} parent 100: prio 1 \
+	handle ${MARK} fw flowid 100:1
+
+filter add dev ${IFACE} parent 100: prio 2 \
+	basic match canid (sff 0x0:0x0 eff 0x0:0x0) flowid 100:2
+
+EOF
+}
+
+clear
+prio_etf_mark
+show