ptp4l: add servo selection to the configuration file

this patch adds the servo selection to the configuration file

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>

config.c

@@ -303,6 +303,13 @@ static void scan_global_line(const char *s, struct config *cfg)
 				cfg->transport = TRANS_IEEE_802_3;
 
 		}
+
+	} else if (1 == sscanf(s, " clock_servo %1023s", string)) {
+
+		if (0 == strcasecmp("pi", string))
+
+			cfg->clock_servo = CLOCK_SERVO_PI;
+
 	}
 }
 

config.h

@@ -23,6 +23,7 @@
 #include "ds.h"
 #include "dm.h"
 #include "transport.h"
+#include "servo.h"
 
 #define MAX_PORTS 8
 #define MAX_IFNAME_SIZE 16
@@ -60,6 +61,9 @@ struct config {
 	int *assume_two_step;
 	int *tx_timestamp_retries;
 	int *rx_timestamp_l2only;
+
+	enum servo_type clock_servo;
+
 	double *pi_proportional_const;
 	double *pi_integral_const;
 	unsigned char *ptp_dst_mac;

ptp4l.c

@@ -65,6 +65,9 @@ static struct config cfg_settings = {
 	.assume_two_step = &assume_two_step,
 	.tx_timestamp_retries = &sk_tx_retries,
 	.rx_timestamp_l2only = &sk_prefer_layer2,
+
+	.clock_servo = CLOCK_SERVO_PI,
+
 	.pi_proportional_const = &configured_pi_kp,
 	.pi_integral_const = &configured_pi_ki,
 	.ptp_dst_mac = ptp_dst_mac,
@@ -272,7 +275,7 @@ int main(int argc, char *argv[])
 	}
 
 	clock = clock_create(phc_index, iface, cfg_settings.nports,
-			     *timestamping, ds, CLOCK_SERVO_PI);
+			     *timestamping, ds, cfg_settings.clock_servo);
 	if (!clock) {
 		fprintf(stderr, "failed to create a clock\n");
 		return -1;