When "notSlave" is true, the port always returns NULL when computing its
best foreign master. As a result, the port will never enter the SLAVE
state, and the clock will ignore Announce messages received on that port.
Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
config.c | 1 +
default.cfg | 1 +
gPTP.cfg | 1 +
port.c | 5 +++++
ptp4l.8 | 7 +++++++
5 files changed, 15 insertions(+)
diff --git a/config.c b/config.c
index 97fd649..626d215 100644
--- a/config.c
+++ b/config.c
@@ -215,6 +215,7 @@ struct config_item config_tab[] = {
PORT_ITEM_INT("min_neighbor_prop_delay", -20000000, INT_MIN, -1),
PORT_ITEM_INT("neighborPropDelayThresh", 20000000, 0, INT_MAX),
PORT_ITEM_ENU("network_transport", TRANS_UDP_IPV4, nw_trans_enu),
+ PORT_ITEM_INT("notSlave", 0, 0, 1),
GLOB_ITEM_INT("ntpshm_segment", 0, INT_MIN, INT_MAX),
GLOB_ITEM_INT("offsetScaledLogVariance", 0xffff, 0, UINT16_MAX),
PORT_ITEM_INT("path_trace_enabled", 0, 0, 1),
diff --git a/default.cfg b/default.cfg
index 1e8d334..93dff29 100644
--- a/default.cfg
+++ b/default.cfg
@@ -29,6 +29,7 @@ syncReceiptTimeout 0
delayAsymmetry 0
fault_reset_interval 4
neighborPropDelayThresh 20000000
+notSlave 0
portDS.localPriority 128
#
# Run time options
diff --git a/gPTP.cfg b/gPTP.cfg
index b0c94db..0126ff9 100644
--- a/gPTP.cfg
+++ b/gPTP.cfg
@@ -27,6 +27,7 @@ delayAsymmetry 0
fault_reset_interval 4
neighborPropDelayThresh 800
min_neighbor_prop_delay -20000000
+notSlave 0
portDS.localPriority 128
#
# Run time options
diff --git a/port.c b/port.c
index b957429..b5e2ac5 100644
--- a/port.c
+++ b/port.c
@@ -120,6 +120,7 @@ struct port {
int freq_est_interval;
int hybrid_e2e;
int min_neighbor_prop_delay;
+ int not_slave;
int path_trace_enabled;
int rx_timestamp_offset;
int tx_timestamp_offset;
@@ -1489,6 +1490,7 @@ static int port_initialize(struct port *p)
p->logMinPdelayReqInterval = config_get_int(cfg, p->name,
"logMinPdelayReqInterval");
p->neighborPropDelayThresh = config_get_int(cfg, p->name,
"neighborPropDelayThresh");
p->min_neighbor_prop_delay = config_get_int(cfg, p->name,
"min_neighbor_prop_delay");
+ p->not_slave = config_get_int(cfg, p->name, "notSlave");
for (i = 0; i < N_TIMER_FDS; i++) {
fd[i] = -1;
@@ -2059,6 +2061,9 @@ struct foreign_clock *port_compute_best(struct port *p)
p->best = NULL;
+ if (p->not_slave)
+ return p->best;
+
LIST_FOREACH(fc, &p->foreign_masters, list) {
tmp = TAILQ_FIRST(&fc->messages);
if (!tmp)
diff --git a/ptp4l.8 b/ptp4l.8
index 0aeabcc..bd25cc5 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -227,6 +227,13 @@ The default is UDPv4.
Upper limit for peer delay in nanoseconds. If the estimated peer delay is
greater than this value the port is marked as not 802.1AS capable.
.TP
+.B notSlave
+Setting this option to one (1) prevents the port from entering the
+SLAVE state. In addition, the local clock will ignore Announce
+messages received on this port. This option's intended use is to
+support the Telecom Profile according to ITU-T G.8275.1. The default
+value is zero or false.
+.TP
.B portDS.localPriority
The Telecom Profile (ITU-T G.8275.1) specifies an alternate Best
Master Clock Algorithm (BMCA) with a unique data set comparison
--
2.11.0
------------------------------------------------------------------------------
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