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refclock: add option to treat non-PPS refclocks as PPS

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Add pps option to the refclock directive to force chronyd to treat any
refclock as a PPS refclock. This is intended for refclocks that may
provide time off by a whole number of seconds due to missing or wrong
TAI/GPS->UTC conversion.
This commit is contained in:
Miroslav Lichvar 2017-05-11 13:58:17 +02:00
parent cff15f91d4
commit f31f68ae8e
3 changed files with 12 additions and 1 deletions
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7
conf.c
View file

@ -674,7 +674,7 @@ static void
parse_refclock(char *line)
{
int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
int max_lock_age;
int max_lock_age, pps_forced;
uint32_t ref_id, lock_ref_id;
double offset, delay, precision, max_dispersion;
char *p, *cmd, *name, *param;
@ -684,6 +684,7 @@ parse_refclock(char *line)
poll = 4;
dpoll = 0;
filter_length = 64;
pps_forced = 0;
pps_rate = 0;
min_samples = SRC_DEFAULT_MINSAMPLES;
max_samples = SRC_DEFAULT_MAXSAMPLES;
@ -756,6 +757,9 @@ parse_refclock(char *line)
} else if (!strcasecmp(cmd, "delay")) {
if (sscanf(line, "%lf%n", &delay, &n) != 1)
break;
} else if (!strcasecmp(cmd, "pps")) {
n = 0;
pps_forced = 1;
} else if (!strcasecmp(cmd, "precision")) {
if (sscanf(line, "%lf%n", &precision, &n) != 1)
break;
@ -791,6 +795,7 @@ parse_refclock(char *line)
refclock->driver_poll = dpoll;
refclock->poll = poll;
refclock->filter_length = filter_length;
refclock->pps_forced = pps_forced;
refclock->pps_rate = pps_rate;
refclock->min_samples = min_samples;
refclock->max_samples = max_samples;

5
refclock.c
View file

@ -75,6 +75,7 @@ struct RCL_Instance_Record {
int driver_polled;
int poll;
int leap_status;
int pps_forced;
int pps_rate;
int pps_active;
int max_lock_age;
@ -198,6 +199,7 @@ RCL_AddRefclock(RefclockParameters *params)
inst->poll = params->poll;
inst->driver_polled = 0;
inst->leap_status = LEAP_Normal;
inst->pps_forced = params->pps_forced;
inst->pps_rate = params->pps_rate;
inst->pps_active = 0;
inst->max_lock_age = params->max_lock_age;
@ -362,6 +364,9 @@ RCL_AddSample(RCL_Instance instance, struct timespec *sample_time, double offset
double correction, dispersion;
struct timespec cooked_time;
if (instance->pps_forced)
return RCL_AddPulse(instance, sample_time, -offset);
LCL_GetOffsetCorrection(sample_time, &correction, &dispersion);
UTI_AddDoubleToTimespec(sample_time, correction, &cooked_time);
dispersion += instance->precision;

1
refclock.h
View file

@ -37,6 +37,7 @@ typedef struct {
int driver_poll;
int poll;
int filter_length;
int pps_forced;
int pps_rate;
int min_samples;
int max_samples;