Add options to configure delay filter.

Add new options delay_filter and delay_filter_length to select the
filter and its length. They set both the clock delay filter and the port
peer delay filter. The default is now moving median with 10 samples.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>

clock.c

@@ -41,7 +41,6 @@
 
 #define CLK_N_PORTS (MAX_PORTS + 1) /* plus one for the UDS interface */
 #define N_CLOCK_PFD (N_POLLFD + 1) /* one extra per port, for the fault timer */
-#define MAVE_LENGTH 10
 #define POW2_41 ((double)(1ULL << 41))
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
@@ -632,7 +631,8 @@ struct clock *clock_create(int phc_index, struct interface *iface, int count,
 		return NULL;
 	}
 	c->servo_state = SERVO_UNLOCKED;
-	c->delay_filter = filter_create(FILTER_MOVING_AVERAGE, MAVE_LENGTH);
+	c->delay_filter = filter_create(dds->delay_filter,
+					dds->delay_filter_length);
 	if (!c->delay_filter) {
 		pr_err("Failed to create delay filter");
 		return NULL;

config.c

@@ -159,6 +159,7 @@ static enum parser_result parse_port_setting(const char *option,
 					    int p)
 {
 	enum parser_result r;
+	int val;
 
 	r = parse_pod_setting(option, value, &cfg->iface[p].pod);
 	if (r != NOT_PARSED)
@@ -183,6 +184,21 @@ static enum parser_result parse_port_setting(const char *option,
 			cfg->iface[p].dm = DM_P2P;
 		else
 			return BAD_VALUE;
+
+	} else if (!strcmp(option, "delay_filter")) {
+		if (!strcasecmp("moving_average", value))
+			cfg->iface[p].delay_filter = FILTER_MOVING_AVERAGE;
+		else if (!strcasecmp("moving_median", value))
+			cfg->iface[p].delay_filter = FILTER_MOVING_MEDIAN;
+		else
+			return BAD_VALUE;
+
+	} else if (!strcmp(option, "delay_filter_length")) {
+		r = get_ranged_int(value, &val, 1, INT_MAX);
+		if (r != PARSED_OK)
+			return r;
+		cfg->iface[p].delay_filter_length = val;
+
 	} else
 		return NOT_PARSED;
 
@@ -510,6 +526,20 @@ static enum parser_result parse_global_setting(const char *option,
 			return r;
 		cfg->dds.time_source = val;
 
+	} else if (!strcmp(option, "delay_filter")) {
+		if (!strcasecmp("moving_average", value))
+			cfg->dds.delay_filter = FILTER_MOVING_AVERAGE;
+		else if (!strcasecmp("moving_median", value))
+			cfg->dds.delay_filter = FILTER_MOVING_MEDIAN;
+		else
+			return BAD_VALUE;
+
+	} else if (!strcmp(option, "delay_filter_length")) {
+		r = get_ranged_int(value, &val, 1, INT_MAX);
+		if (r != PARSED_OK)
+			return r;
+		cfg->dds.delay_filter_length = val;
+
 	} else
 		return NOT_PARSED;
 
@@ -667,6 +697,9 @@ int config_create_interface(char *name, struct config *cfg)
 
 	sk_get_ts_info(name, &iface->ts_info);
 
+	iface->delay_filter = cfg->dds.delay_filter;
+	iface->delay_filter_length = cfg->dds.delay_filter_length;
+
 	cfg->nports++;
 
 	return i;

config.h

@@ -22,6 +22,7 @@
 
 #include "ds.h"
 #include "dm.h"
+#include "filter.h"
 #include "transport.h"
 #include "servo.h"
 #include "sk.h"
@@ -36,6 +37,8 @@ struct interface {
 	enum transport_type transport;
 	struct port_defaults pod;
 	struct sk_ts_info ts_info;
+	enum filter_type delay_filter;
+	int delay_filter_length;
 };
 
 #define CFG_IGNORE_DM           (1 << 0)

default.cfg

@@ -67,6 +67,8 @@ uds_address		/var/run/ptp4l
 network_transport	UDPv4
 delay_mechanism		E2E
 time_stamping		hardware
+delay_filter		moving_median
+delay_filter_length	10
 #
 # Clock description
 #

ds.h

@@ -22,6 +22,7 @@
 
 #include "ddt.h"
 #include "fault.h"
+#include "filter.h"
 
 /* clock data sets */
 
@@ -57,6 +58,8 @@ struct default_ds {
 	int sanity_freq_limit;
 	int time_source;
 	struct clock_description clock_desc;
+	enum filter_type delay_filter;
+	int delay_filter_length;
 };
 
 struct dataset {

gPTP.cfg

@@ -65,3 +65,5 @@ uds_address		/var/run/ptp4l
 network_transport	L2
 delay_mechanism		P2P
 time_stamping		hardware
+delay_filter		moving_median
+delay_filter_length	10

port.c

@@ -37,7 +37,6 @@
 #include "util.h"
 
 #define ALLOWED_LOST_RESPONSES 3
-#define PORT_MAVE_LENGTH 10
 
 enum syfu_state {
 	SF_EMPTY,
@@ -2306,7 +2305,8 @@ struct port *port_open(int phc_index,
 	p->delayMechanism = interface->dm;
 	p->versionNumber = PTP_VERSION;
 
-	p->delay_filter = filter_create(FILTER_MOVING_AVERAGE, PORT_MAVE_LENGTH);
+	p->delay_filter = filter_create(interface->delay_filter,
+					interface->delay_filter_length);
 	if (!p->delay_filter) {
 		pr_err("Failed to create delay filter");
 		transport_destroy(p->trp);

ptp4l.8

@@ -192,6 +192,15 @@ The default is UDPv4.
 .B neighborPropDelayThresh
 Upper limit for peer delay in nanoseconds. If the estimated peer delay is
 greater than this value the port is marked as not 802.1AS capable.
+.TP
+.B delay_filter
+Select the algorithm used to filter the measured delay and peer delay. Possible
+values are moving_average and moving_median.
+The default is moving_median.
+.TP
+.B delay_filter_length
+The length of the delay filter in samples.
+The default is 10.
 
 .SH PROGRAM AND CLOCK OPTIONS
 

ptp4l.c

@@ -71,6 +71,8 @@ static struct config cfg_settings = {
 			.userDescription      = { .max_symbols = 128 },
 			.manufacturerIdentity = { 0, 0, 0 },
 		},
+		.delay_filter = FILTER_MOVING_MEDIAN,
+		.delay_filter_length = 10,
 	},
 
 	.pod = {