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Estimate the neighbor rate ratio from a slaved port. 

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2012-08-31 15:57:02 +02:00
parent f86997185e
commit 5e40b5ec01
1 changed files with 51 additions and 1 deletions
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52
port.c
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@ -38,6 +38,14 @@
#define PORT_MAVE_LENGTH 10
struct nrate_estimator {
double ratio;
tmv_t origin1;
tmv_t ingress1;
int max_count;
int count;
};
struct port {
char *name;
struct clock *clock;
@ -60,6 +68,7 @@ struct port {
tmv_t peer_delay;
struct mave *avg_delay;
int log_sync_interval;
struct nrate_estimator nrate;
/* portDS */
struct port_defaults pod;
struct PortIdentity portIdentity;
@ -368,6 +377,42 @@ static int port_ignore(struct port *p, struct ptp_message *m)
return 0;
}
static void port_nrate_calculate(struct port *p, tmv_t t3, tmv_t t4, tmv_t c)
{
tmv_t origin2;
struct nrate_estimator *n = &p->nrate;
if (!n->ingress1) {
n->ingress1 = t4;
n->origin1 = tmv_add(t3, c);
return;
}
n->count++;
if (n->count < n->max_count) {
return;
}
origin2 = tmv_add(t3, c);
n->ratio =
tmv_dbl(tmv_sub(origin2, n->origin1)) /
tmv_dbl(tmv_sub(t4, n->ingress1));
n->ingress1 = t4;
n->origin1 = origin2;
n->count = 0;
}
static void port_nrate_initialize(struct port *p)
{
int shift = p->pod.freq_est_interval - p->logMinPdelayReqInterval;
if (shift < 0)
shift = 0;
p->nrate.origin1 = tmv_zero();
p->nrate.ingress1 = tmv_zero();
p->nrate.max_count = (1 << shift);
p->nrate.count = 0;
}
static int port_set_announce_tmo(struct port *p)
{
return set_tmo(p->fda.fd[FD_ANNOUNCE_TIMER],
@ -769,6 +814,8 @@ static int port_initialize(struct port *p)
if (port_set_announce_tmo(p))
goto no_tmo;
port_nrate_initialize(p);
clock_install_fda(p->clock, p, p->fda);
return 0;
@ -1132,6 +1179,9 @@ calc:
pr_debug("pdelay %hu %10lld %10lld", portnum(p), p->peer_delay, pd);
if (p->pod.follow_up_info)
port_nrate_calculate(p, t3, t4, tmv_add(c1, c2));
if (p->state == PS_UNCALIBRATED || p->state == PS_SLAVE) {
clock_peer_delay(p->clock, p->peer_delay);
}
@ -1610,7 +1660,7 @@ struct port *port_open(int phc_index,
free(p);
return NULL;
}
p->nrate.ratio = 1.0;
return p;
}