Add a configuration option to control the path trace mechanism.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

config.c

@@ -91,6 +91,10 @@ static void scan_line(char *s, struct config *cfg)
 
 		pod->transportSpecific = u8 << 4;
 
+	} else if (1 == sscanf(s, " path_trace_enabled %u", &val)) {
+
+		pod->path_trace_enabled = val ? 1 : 0;
+
 	} else if (1 == sscanf(s, " assume_two_step %u", &val)) {
 
 		*cfg->assume_two_step = val ? 1 : 0;

default.cfg

@@ -20,6 +20,7 @@ announceReceiptTimeout	3
 #
 # Run time options
 #
+path_trace_enabled	0
 tx_timestamp_retries	2
 rx_timestamp_l2only	0
 pi_proportional_const	0.0

ds.h

@@ -83,6 +83,7 @@ struct port_defaults {
 	Integer8 logMinPdelayReqInterval;
 	UInteger8 announceReceiptTimeout;
 	UInteger8 transportSpecific;
+	int path_trace_enabled;
 };
 
 #endif

gPTP.cfg

@@ -20,6 +20,7 @@ announceReceiptTimeout	3
 # Run time options
 #
 assume_two_step		1
+path_trace_enabled	1
 tx_timestamp_retries	2
 rx_timestamp_l2only	1
 pi_proportional_const	0.0

ptp4l.c

@@ -194,6 +194,7 @@ int main(int argc, char *argv[])
 	pod.logMinPdelayReqInterval = 0;
 	pod.announceReceiptTimeout = 3;
 	pod.transportSpecific = 0;
+	pod.path_trace_enabled = 0;
 
 	if (generate_clock_identity(&ds.clockIdentity, iface[0].name)) {
 		fprintf(stderr, "failed to generate a clock identity\n");