selftests/net: plug rxtimestamp test into kselftest framework

Run rxtimestamp as part of TEST_PROGS. Analogous to other tests, add
new rxtimestamp.sh wrapper script, so that the test runs isolated
from background traffic in a private network namespace.

Also ignore failures of test case #6 by default. This case verifies
that a receive timestamp is not reported if timestamp reporting is
enabled for a socket, but generation is disabled. Receive timestamp
generation has to be enabled globally, as no associated socket is
known yet. A background process that enables rx timestamp generation
therefore causes a false positive. Ntpd is one example that does.

Add a "--strict" option to cause failure in the event that any test
case fails, including test #6. This is useful for environments that
are known to not have such background processes.

Tested:
make -C tools/testing/selftests TARGETS="net" run_tests

Signed-off-by: Tanner Love <tannerlove@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/Makefile

@@ -17,6 +17,7 @@ TEST_PROGS += route_localnet.sh
 TEST_PROGS += reuseaddr_ports_exhausted.sh
 TEST_PROGS += txtimestamp.sh
 TEST_PROGS += vrf-xfrm-tests.sh
+TEST_PROGS += rxtimestamp.sh
 TEST_PROGS_EXTENDED := in_netns.sh
 TEST_GEN_FILES =  socket nettest
 TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any

tools/testing/selftests/net/rxtimestamp.c

@@ -44,6 +44,7 @@ struct test_case {
 	struct options sockopt;
 	struct tstamps expected;
 	bool enabled;
+	bool warn_on_fail;
 };
 
 struct sof_flag {
@@ -89,7 +90,7 @@ static struct test_case test_cases[] = {
 	},
 	{
 		{ so_timestamping: SOF_TIMESTAMPING_SOFTWARE },
-		{}
+		warn_on_fail : true
 	},
 	{
 		{ so_timestamping: SOF_TIMESTAMPING_RX_SOFTWARE
@@ -115,6 +116,7 @@ static struct option long_options[] = {
 	{ "tcp", no_argument, 0, 't' },
 	{ "udp", no_argument, 0, 'u' },
 	{ "ip", no_argument, 0, 'i' },
+	{ "strict", no_argument, 0, 'S' },
 	{ NULL, 0, NULL, 0 },
 };
 
@@ -327,6 +329,7 @@ int main(int argc, char **argv)
 {
 	bool all_protocols = true;
 	bool all_tests = true;
+	bool strict = false;
 	int arg_index = 0;
 	int failures = 0;
 	int s, t;
@@ -363,6 +366,9 @@ int main(int argc, char **argv)
 			all_protocols = false;
 			socket_types[0].enabled = true;
 			break;
+		case 'S':
+			strict = true;
+			break;
 		default:
 			error(1, 0, "Failed to parse parameters.");
 		}
@@ -379,7 +385,8 @@ int main(int argc, char **argv)
 
 			printf("Starting testcase %d...\n", t);
 			if (run_test_case(socket_types[s], test_cases[t])) {
-				failures++;
+				if (strict || !test_cases[t].warn_on_fail)
+					failures++;
 				printf("FAILURE in test case ");
 				print_test_case(&test_cases[t]);
 			}

tools/testing/selftests/net/rxtimestamp.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+./in_netns.sh ./rxtimestamp $@