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Introduce an option to ignore the transport specific field. 

Up until now the transportSpecific field has been treated according to
802.1AS, namely as a field that must match exactly on receive.
However, 1588 mandates ignoring this field for some transports, and
there is equipment in the wild that does in fact set the reserved
bits.

This patch adds an option to ignore the field on receive completely.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reported-by: Petr Kulhavy <brain@jikos.cz>
master
Richard Cochran 2018-02-14 09:29:55 -08:00
parent 4b957cf566
commit 99fd084253
3 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
config.c
View File

@ -192,6 +192,7 @@ struct config_item config_tab[] = {
PORT_ITEM_INT("freq_est_interval", 1, 0, INT_MAX),
GLOB_ITEM_INT("gmCapable", 1, 0, 1),
PORT_ITEM_INT("hybrid_e2e", 0, 0, 1),
PORT_ITEM_INT("ignore_transport_specific", 0, 0, 1),
PORT_ITEM_INT("ingressLatency", 0, INT_MIN, INT_MAX),
GLOB_ITEM_INT("initial_delay", 0, 0, INT_MAX),
GLOB_ITEM_INT("kernel_leap", 1, 0, 1),

5
port.c
View File

@ -125,6 +125,7 @@ struct port {
int follow_up_info;
int freq_est_interval;
int hybrid_e2e;
int match_transport_specific;
int min_neighbor_prop_delay;
int path_trace_enabled;
int rx_timestamp_offset;
@ -641,7 +642,8 @@ static int port_ignore(struct port *p, struct ptp_message *m)
if (path_trace_ignore(p, m)) {
return 1;
}
if (msg_transport_specific(m) != p->transportSpecific) {
if (p->match_transport_specific &&
msg_transport_specific(m) != p->transportSpecific) {
return 1;
}
if (pid_eq(&m->header.sourcePortIdentity, &p->portIdentity)) {
@ -1489,6 +1491,7 @@ static int port_initialize(struct port *p)
p->syncReceiptTimeout = config_get_int(cfg, p->name, "syncReceiptTimeout");
p->transportSpecific = config_get_int(cfg, p->name, "transportSpecific");
p->transportSpecific <<= 4;
p->match_transport_specific = !config_get_int(cfg, p->name, "ignore_transport_specific");
p->logSyncInterval = config_get_int(cfg, p->name, "logSyncInterval");
p->logMinPdelayReqInterval = config_get_int(cfg, p->name, "logMinPdelayReqInterval");
p->neighborPropDelayThresh = config_get_int(cfg, p->name, "neighborPropDelayThresh");

8
ptp4l.8
View File

@ -176,6 +176,14 @@ The default is 0 or disabled.
The transport specific field. Must be in the range 0 to 255.
The default is 0.
.TP
.B ignore_transport_specific
By default, incoming messages are dropped if their transportSpecific
field does not match the configured value. However, many of
transports specified in the 1588 standard mandate ignoring this field.
Moreover, some equipment is known to set the reserved bits.
Configuring this option as 1 causes this field to be ignored
completely on receive. The default is 0.
.TP
.B path_trace_enabled
Enable the mechanism used to trace the route of the Announce messages.
The default is 0 (disabled).