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reference: add "local activate" option

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This option sets an activating root distance for the local reference. The
local reference will not be used until the root distance drops below the
configured value for the first time. This can be used to prevent the local
reference from being activated on a server which has never been synchronised
with an upstream server. The default value of 0.0 causes no activating
distance to be used, such that the local reference is always eligible for
activation.
This commit is contained in:
Andy Fiddaman
2024-03-25 19:05:52 +00:00
committed by Miroslav Lichvar
parent b8ead3485b
commit 9397ae2b0a
11 changed files with 50 additions and 20 deletions
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20
reference.c
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@@ -54,6 +54,8 @@ static int enable_local_stratum;
static int local_stratum;
static int local_orphan;
static double local_distance;
static int local_activate_ok;
static double local_activate;
static struct timespec local_ref_time;
static NTP_Leap our_leap_status;
static int our_leap_sec;
@@ -207,6 +209,7 @@ REF_Initialise(void)
our_frequency_sd = 0.0;
our_offset_sd = 0.0;
drift_file_age = 0.0;
local_activate_ok = 0;
/* Now see if we can get the drift file opened */
drift_file = CNF_GetDriftFile();
@@ -245,7 +248,8 @@ REF_Initialise(void)
correction_time_ratio = CNF_GetCorrectionTimeRatio();
enable_local_stratum = CNF_AllowLocalReference(&local_stratum, &local_orphan, &local_distance);
enable_local_stratum = CNF_AllowLocalReference(&local_stratum, &local_orphan,
&local_distance, &local_activate);
UTI_ZeroTimespec(&local_ref_time);
leap_when = 0;
@@ -1132,7 +1136,7 @@ REF_GetReferenceParams
double *root_dispersion
)
{
double dispersion, delta;
double dispersion, delta, distance;
assert(initialised);
@@ -1142,11 +1146,16 @@ REF_GetReferenceParams
dispersion = 0.0;
}
distance = our_root_delay / 2 + dispersion;
if (local_activate == 0.0 || (are_we_synchronised && distance < local_activate))
local_activate_ok = 1;
/* Local reference is active when enabled and the clock is not synchronised
or the root distance exceeds the threshold */
if (are_we_synchronised &&
!(enable_local_stratum && our_root_delay / 2 + dispersion > local_distance)) {
!(enable_local_stratum && local_activate_ok && distance > local_distance)) {
*is_synchronised = 1;
@@ -1158,7 +1167,7 @@ REF_GetReferenceParams
*root_delay = our_root_delay;
*root_dispersion = dispersion;
} else if (enable_local_stratum) {
} else if (enable_local_stratum && local_activate_ok) {
*is_synchronised = 0;
@@ -1258,12 +1267,13 @@ REF_ModifyMakestep(int limit, double threshold)
/* ================================================== */
void
REF_EnableLocal(int stratum, double distance, int orphan)
REF_EnableLocal(int stratum, double distance, int orphan, double activate)
{
enable_local_stratum = 1;
local_stratum = CLAMP(1, stratum, NTP_MAX_STRATUM - 1);
local_distance = distance;
local_orphan = !!orphan;
local_activate = activate;
LOG(LOGS_INFO, "%s local reference mode", "Enabled");
}