config: add a option to enable a poor man's boundary clock.

This patch adds a configuration option that allows running a boundary clock
using "just a bunch of devices". Normally each port is probed to make sure
they all share the same PTP hardware clock, but this option will allow a
heterogeneous collection of devices, should the user really want it.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Jiri Benc <jbenc@redhat.com>

config.c

@@ -217,6 +217,12 @@ static enum parser_result parse_port_setting(const char *option,
 			return r;
 		iface->delay_filter_length = val;
 
+	} else if (!strcmp(option, "boundary_clock_jbod")) {
+		r = get_ranged_int(value, &val, 0, 1);
+		if (r != PARSED_OK)
+			return r;
+		iface->boundary_clock_jbod = val;
+
 	} else
 		return NOT_PARSED;
 
@@ -574,6 +580,12 @@ static enum parser_result parse_global_setting(const char *option,
 			return r;
 		cfg->dds.delay_filter_length = val;
 
+	} else if (!strcmp(option, "boundary_clock_jbod")) {
+		r = get_ranged_int(value, &val, 0, 1);
+		if (r != PARSED_OK)
+			return r;
+		cfg->dds.boundary_clock_jbod = val;
+
 	} else
 		return NOT_PARSED;
 
@@ -762,6 +774,7 @@ void config_init_interface(struct interface *iface, struct config *cfg)
 
 	iface->delay_filter = cfg->dds.delay_filter;
 	iface->delay_filter_length = cfg->dds.delay_filter_length;
+	iface->boundary_clock_jbod = cfg->dds.boundary_clock_jbod;
 }
 
 void config_destroy(struct config *cfg)

config.h

@@ -41,6 +41,7 @@ struct interface {
 	struct sk_ts_info ts_info;
 	enum filter_type delay_filter;
 	int delay_filter_length;
+	int boundary_clock_jbod;
 };
 
 #define CFG_IGNORE_DM           (1 << 0)

default.cfg

@@ -72,6 +72,7 @@ delay_filter		moving_median
 delay_filter_length	10
 egressLatency		0
 ingressLatency		0
+boundary_clock_jbod	0
 #
 # Clock description
 #

ds.h

@@ -61,6 +61,7 @@ struct default_ds {
 	struct clock_description clock_desc;
 	enum filter_type delay_filter;
 	int delay_filter_length;
+	int boundary_clock_jbod;
 };
 
 struct dataset {

gPTP.cfg

@@ -71,3 +71,4 @@ delay_filter		moving_median
 delay_filter_length	10
 egressLatency		0
 ingressLatency		0
+boundary_clock_jbod	0

ptp4l.8

@@ -1,4 +1,4 @@
-.TH PTP4l 8 "October 2013" "linuxptp"
+.TH PTP4l 8 "December 2014" "linuxptp"
 .SH NAME
 ptp4l \- PTP Boundary/Ordinary Clock
 
@@ -217,6 +217,16 @@ 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.
+.TP
+.B boundary_clock_jbod
+When running as a boundary clock (that is, when more than one network
+interface is configured), ptp4l performs a sanity check to make sure
+that all of the ports share the same hardware clock device. This
+option allows ptp4l to work as a boundary clock using "just a bunch of
+devices" that are not synchronized to each other. For this mode, the
+collection of clocks must be synchronized by an external program, for
+example phc2sys(8) in "automatic" mode.
+The default is 0 (disabled).
 
 .SH PROGRAM AND CLOCK OPTIONS
 

ptp4l.c

@@ -75,6 +75,7 @@ static struct config cfg_settings = {
 		},
 		.delay_filter = FILTER_MOVING_MEDIAN,
 		.delay_filter_length = 10,
+		.boundary_clock_jbod = 0,
 	},
 
 	.pod = {