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refclock: rework update of reachability

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Update the reachability register of a refclock source by 1 if a valid
measurement is received by the drivers between source polls, and not
only when it is accumulated to sourcestats, similarly to how
reachability works with NTP sources.

This avoids drops in the reported reachability when a PHC refclock is
dropping samples due to significant changes in the measured delay (e.g.
due to high PCIe load), or a PPS refclock dropping samples due to failed
lock.
This commit is contained in:
Miroslav Lichvar
2024-10-31 14:41:19 +01:00
parent a5d73f692f
commit b9b338a8df
8 changed files with 55 additions and 6 deletions
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14
refclock.c
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@@ -63,6 +63,7 @@ struct RCL_Instance_Record {
int driver_poll;
int driver_polled;
int poll;
int reached;
int leap_status;
int local;
int pps_forced;
@@ -175,6 +176,7 @@ RCL_AddRefclock(RefclockParameters *params)
inst->driver_poll = params->driver_poll;
inst->poll = params->poll;
inst->driver_polled = 0;
inst->reached = 0;
inst->leap_status = LEAP_Normal;
inst->local = params->local;
inst->pps_forced = params->pps_forced;
@@ -665,6 +667,12 @@ RCL_AddCookedPulse(RCL_Instance instance, struct timespec *cooked_time,
return 1;
}
void
RCL_UpdateReachability(RCL_Instance instance)
{
instance->reached++;
}
double
RCL_GetPrecision(RCL_Instance instance)
{
@@ -792,6 +800,9 @@ poll_timeout(void *arg)
if (!(inst->driver->poll && inst->driver_polled < (1 << (inst->poll - inst->driver_poll)))) {
inst->driver_polled = 0;
SRC_UpdateReachability(inst->source, inst->reached > 0);
inst->reached = 0;
if (SPF_GetFilteredSample(inst->filter, &sample)) {
double local_freq, local_offset;
struct timespec local_ref_time;
@@ -807,7 +818,6 @@ poll_timeout(void *arg)
inst->leap_status = LEAP_Unsynchronised;
}
SRC_UpdateReachability(inst->source, 1);
SRC_UpdateStatus(inst->source, stratum, inst->leap_status);
SRC_AccumulateSample(inst->source, &sample);
SRC_SelectSource(inst->source);
@@ -816,8 +826,6 @@ poll_timeout(void *arg)
follow_local(inst, &local_ref_time, local_freq, local_offset);
log_sample(inst, &sample.time, 1, 0, 0.0, sample.offset, sample.peer_dispersion);
} else {
SRC_UpdateReachability(inst->source, 0);
}
}