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config: Add a configuration option for preventing loops in TC mode. 

According to 1588, PTP message loops are simply someone else's problem
with respect to transparent clocks.  Since we are running the BMCA for
syntonization anyway, we might as well go ahead and implement the spanning
tree for PTP messages.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2018-04-16 16:20:06 -07:00
parent c8107c8d4b
commit e6af4608c4
4 changed files with 9 additions and 0 deletions
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1
config.c
View File

@ -254,6 +254,7 @@ struct config_item config_tab[] = {
GLOB_ITEM_DBL("step_threshold", 0.0, 0.0, DBL_MAX),
GLOB_ITEM_INT("summary_interval", 0, INT_MIN, INT_MAX),
PORT_ITEM_INT("syncReceiptTimeout", 0, 0, UINT8_MAX),
GLOB_ITEM_INT("tc_spanning_tree", 0, 1, 1),
GLOB_ITEM_INT("timeSource", INTERNAL_OSCILLATOR, 0x10, 0xfe),
GLOB_ITEM_ENU("time_stamping", TS_HARDWARE, timestamping_enu),
PORT_ITEM_INT("transportSpecific", 0, 0, 0x0F),

1
default.cfg
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@ -40,6 +40,7 @@ path_trace_enabled 0
follow_up_info 0
hybrid_e2e 0
net_sync_monitor 0
tc_spanning_tree 0
tx_timestamp_timeout 1
use_syslog 1
verbose 0

1
port.c
View File

@ -2830,6 +2830,7 @@ struct port *port_open(int phc_index,
p->hybrid_e2e = config_get_int(cfg, p->name, "hybrid_e2e");
p->net_sync_monitor = config_get_int(cfg, p->name, "net_sync_monitor");
p->path_trace_enabled = config_get_int(cfg, p->name, "path_trace_enabled");
p->tc_spanning_tree = config_get_int(cfg, p->name, "tc_spanning_tree");
p->rx_timestamp_offset = config_get_int(cfg, p->name, "ingressLatency");
p->rx_timestamp_offset <<= 16;
p->tx_timestamp_offset = config_get_int(cfg, p->name, "egressLatency");

6
ptp4l.8
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@ -399,6 +399,12 @@ Treat one-step responses as two-step if enabled. It is used to work around
buggy 802.1AS switches.
The default is 0 (disabled).
.TP
.B tc_spanning_tree
When running as a Transparent Clock, increment the "stepsRemoved"
field of Announce messages that pass through the switch. Enabling
this option ensures that PTP message loops never form, provided the
switches all implement this option together with the BMCA.
.TP
.B tx_timestamp_timeout
The number of milliseconds to poll waiting for the tx time stamp from the kernel
when a message has recently been sent.