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port: drop erroneous neighbor rate ratio 

When a connected peer introduces a time discontinuities in between
consecutive peer-delay measurements (i.e. a jump in time in
consecutive PDelay response), an erroneous neighbor rate ratio is
calculated. This change disqualifies any neighbor rate ratio that
exceeds +/- 100 ppm, as required by IEEE 802.1AS-2011 Anex B.1.1.

This patch is to check and drop erroneous neighbor rate ratio to
ensure IEEE 802.1AS-2011 Anex B.1.1.

Signed-off-by: Rodney Greenstreet <rodney.greenstreet@ni.com>
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
master
Rodney Greenstreet 2019-10-24 12:43:19 +08:00 committed by Vladimir Oltean
parent f8ffb2cf5a
commit 416058d136
1 changed files with 12 additions and 1 deletions
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13
port.c
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@ -47,6 +47,7 @@
#define ALLOWED_LOST_RESPONSES 3
#define ANNOUNCE_SPAN 1
#define MAX_NEIGHBOR_FREQ_OFFSET 0.0002
enum syfu_event {
SYNC_MISMATCH,
@ -1024,6 +1025,7 @@ static int port_management_set(struct port *target,
static void port_nrate_calculate(struct port *p, tmv_t origin, tmv_t ingress)
{
struct nrate_estimator *n = &p->nrate;
double ratio;
/*
* We experienced a successful exchanges of peer delay request
@ -1044,9 +1046,18 @@ static void port_nrate_calculate(struct port *p, tmv_t origin, tmv_t ingress)
pr_warning("bad timestamps in nrate calculation");
return;
}
n->ratio =
ratio =
tmv_dbl(tmv_sub(origin, n->origin1)) /
tmv_dbl(tmv_sub(ingress, n->ingress1));
if ((ratio <= (1.0 + MAX_NEIGHBOR_FREQ_OFFSET)) &&
(ratio >= (1.0 - MAX_NEIGHBOR_FREQ_OFFSET)))
n->ratio = ratio;
else
pr_debug("port %hu: drop erroneous nratio %lf, max offset %lf",
portnum(p), ratio, MAX_NEIGHBOR_FREQ_OFFSET);
n->ingress1 = ingress;
n->origin1 = origin;
n->count = 0;