Re: [PATCH net-next v6 8/8] selftests: hsr: Add test for the inline PTP header on HSR

This test verifies the inline header which is used by HSR stack with the
ether type ETH_P_1588.
The HSR stack needs to recognize this header, strip it and send the
requested packet only on the requested port.

This test needs a HSR device and the two slave devices passed. It will
will send a sample PTP packet with this inline header, requesting one of
the ports combining with and without the HSR header. A total of four
packets is sent.
The test checks both ports devices for packets and complains if the
packet was not observed on the expected port and/ or observed on the
other port. The received content of the data is compared against the
send data sample.

Test suggested by Felix Maurer.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 tools/testing/selftests/net/hsr/.gitignore     |   1 +
 tools/testing/selftests/net/hsr/Makefile       |   5 +
 tools/testing/selftests/net/hsr/hsr_ptp.sh     | 109 ++++++
 tools/testing/selftests/net/hsr/hsr_ptp_test.c | 495 +++++++++++++++++++++++++
 4 files changed, 610 insertions(+)

diff --git a/tools/testing/selftests/net/hsr/.gitignore b/tools/testing/selftests/net/hsr/.gitignore
new file mode 100644
index 0000000000000..849eecb84c974
--- /dev/null
+++ b/tools/testing/selftests/net/hsr/.gitignore

@@ -0,0 +1 @@
+hsr_ptp_test

diff --git a/tools/testing/selftests/net/hsr/Makefile b/tools/testing/selftests/net/hsr/Makefile
index 2150e487ac7d7..5d0134ead65d7 100644
--- a/tools/testing/selftests/net/hsr/Makefile
+++ b/tools/testing/selftests/net/hsr/Makefile

@@ -2,14 +2,19 @@
 
 top_srcdir = ../../../../..
 
+CFLAGS += -Wall -Wl,--no-as-needed -O2 -g
+
 TEST_PROGS := \
 	hsr_ping.sh \
 	hsr_prp_redbox.sh \
 	hsr_redbox.sh \
 	link_faults.sh \
 	prp_ping.sh \
+	hsr_ptp.sh \
 # end of TEST_PROGS

 
 TEST_FILES += hsr_common.sh
 
+TEST_GEN_FILES := hsr_ptp_test
+
 include ../../lib.mk

diff --git a/tools/testing/selftests/net/hsr/hsr_ptp.sh b/tools/testing/selftests/net/hsr/hsr_ptp.sh
new file mode 100755
index 0000000000000..034c635916f81
--- /dev/null
+++ b/tools/testing/selftests/net/hsr/hsr_ptp.sh

@@ -0,0 +1,109 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ipv6=false
+
+source ./hsr_common.sh
+
+optstring="h4"
+usage() {
+	echo "Usage: $0"
+}
+
+while getopts "$optstring" option;do
+	case "$option" in
+	"h")
+		usage $0