netdev - [PATCH v3 4/9] testptp: Add support for testing ptp_clock

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Message-Id: <20230612211500.309075-5-rrameshbabu@nvidia.com>
Date: Mon, 12 Jun 2023 14:14:55 -0700
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: netdev@...r.kernel.org
Cc: Gal Pressman <gal@...dia.com>,
	Saeed Mahameed <saeed@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>,
	Shuah Khan <shuah@...nel.org>,
	Maciek Machnikowski <maciek@...hnikowski.net>
Subject: [PATCH v3 4/9] testptp: Add support for testing ptp_clock_info .adjphase callback

Invoke clock_adjtime syscall with tx.modes set with ADJ_OFFSET when testptp
is invoked with a phase adjustment offset value. Support seconds and
nanoseconds for the offset value.

Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Maciek Machnikowski <maciek@...hnikowski.net>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Acked-by: Richard Cochran <richardcochran@...il.com>
---
 tools/testing/selftests/ptp/testptp.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ptp/testptp.c b/tools/testing/selftests/ptp/testptp.c
index ca2b03d57aef..ae23ef51f198 100644
--- a/tools/testing/selftests/ptp/testptp.c
+++ b/tools/testing/selftests/ptp/testptp.c
@@ -134,6 +134,7 @@ static void usage(char *progname)
 		"            1 - external time stamp\n"
 		"            2 - periodic output\n"
 		" -n val     shift the ptp clock time by 'val' nanoseconds\n"
+		" -o val     phase offset (in nanoseconds) to be provided to the PHC servo\n"
 		" -p val     enable output with a period of 'val' nanoseconds\n"
 		" -H val     set output phase to 'val' nanoseconds (requires -p)\n"
 		" -w val     set output pulse width to 'val' nanoseconds (requires -p)\n"
@@ -167,6 +168,7 @@ int main(int argc, char *argv[])
 	int adjfreq = 0x7fffffff;
 	int adjtime = 0;
 	int adjns = 0;
+	int adjphase = 0;
 	int capabilities = 0;
 	int extts = 0;
 	int flagtest = 0;
@@ -188,7 +190,7 @@ int main(int argc, char *argv[])
 
 	progname = strrchr(argv[0], '/');
 	progname = progname ? 1+progname : argv[0];
-	while (EOF != (c = getopt(argc, argv, "cd:e:f:ghH:i:k:lL:n:p:P:sSt:T:w:z"))) {
+	while (EOF != (c = getopt(argc, argv, "cd:e:f:ghH:i:k:lL:n:o:p:P:sSt:T:w:z"))) {
 		switch (c) {
 		case 'c':
 			capabilities = 1;
@@ -228,6 +230,9 @@ int main(int argc, char *argv[])
 		case 'n':
 			adjns = atoi(optarg);
 			break;
+		case 'o':
+			adjphase = atoi(optarg);
+			break;
 		case 'p':
 			perout = atoll(optarg);
 			break;
@@ -327,6 +332,18 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (adjphase) {
+		memset(&tx, 0, sizeof(tx));
+		tx.modes = ADJ_OFFSET | ADJ_NANO;
+		tx.offset = adjphase;
+
+		if (clock_adjtime(clkid, &tx) < 0) {
+			perror("clock_adjtime");
+		} else {
+			puts("phase adjustment okay");
+		}
+	}
+
 	if (gettime) {
 		if (clock_gettime(clkid, &ts)) {
 			perror("clock_gettime");
-- 
2.40.1