config: Introduce options for correcting transmit and receive delays.

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

config.c

@@ -132,6 +132,18 @@ static enum parser_result parse_pod_setting(const char *option,
 			return r;
 		pod->min_neighbor_prop_delay = val;
 
+	} else if (!strcmp(option, "egressLatency")) {
+		r = get_ranged_int(value, &val, INT_MIN, INT_MAX);
+		if (r != PARSED_OK)
+			return r;
+		pod->tx_timestamp_offset = val;
+
+	} else if (!strcmp(option, "ingressLatency")) {
+		r = get_ranged_int(value, &val, INT_MIN, INT_MAX);
+		if (r != PARSED_OK)
+			return r;
+		pod->rx_timestamp_offset = val;
+
 	} else if (!strcmp(option, "fault_badpeernet_interval")) {
 		pod->flt_interval_pertype[FT_BAD_PEER_NETWORK].type = FTMO_LINEAR_SECONDS;
 		if (!strcasecmp("ASAP", value)) {

default.cfg

@@ -70,6 +70,8 @@ delay_mechanism		E2E
 time_stamping		hardware
 delay_filter		moving_median
 delay_filter_length	10
+egressLatency		0
+ingressLatency		0
 #
 # Clock description
 #

ds.h

@@ -137,6 +137,8 @@ struct port_defaults {
 	struct fault_interval flt_interval_pertype[FT_CNT];
 	UInteger32 neighborPropDelayThresh; /*nanoseconds*/
 	int min_neighbor_prop_delay; /*nanoseconds*/
+	int tx_timestamp_offset; /*nanoseconds*/
+	int rx_timestamp_offset; /*nanoseconds*/
 };
 
 #endif

gPTP.cfg

@@ -69,3 +69,5 @@ delay_mechanism		P2P
 time_stamping		hardware
 delay_filter		moving_median
 delay_filter_length	10
+egressLatency		0
+ingressLatency		0

ptp4l.8

@@ -205,6 +205,18 @@ The default is moving_median.
 .B delay_filter_length
 The length of the delay filter in samples.
 The default is 10.
+.TP
+.B egressLatency
+Specifies the difference in nanoseconds between the actual transmission
+time at the reference plane and the reported transmit time stamp. This
+value will be added to egress time stamps obtained from the hardware.
+The default is 0.
+.TP
+.B ingressLatency
+Specifies the difference in nanoseconds between the reported receive
+time stamp and the actual reception time at reference plane. This value
+will be subtracted from ingress time stamps obtained from the hardware.
+The default is 0.
 
 .SH PROGRAM AND CLOCK OPTIONS
 

ptp4l.c

@@ -92,6 +92,8 @@ static struct config cfg_settings = {
 		/* Default to very a large neighborPropDelay threshold */
 		.neighborPropDelayThresh = 20000000,
 		.min_neighbor_prop_delay = -20000000,
+		.tx_timestamp_offset = 0,
+		.rx_timestamp_offset = 0,
 	},
 
 	.timestamping = TS_HARDWARE,