Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
 config.c    |   12 ++++++++++++
 default.cfg |    2 ++
 ds.h        |    2 ++
 gPTP.cfg    |    2 ++
 ptp4l.8     |   12 ++++++++++++
 ptp4l.c     |    2 ++
 6 files changed, 32 insertions(+)

diff --git a/config.c b/config.c
index d5fa378..f9efca0 100644
--- a/config.c
+++ b/config.c
@@ -132,6 +132,18 @@ static enum parser_result parse_pod_setting(const char 
*option,
                        return r;
                pod->min_neighbor_prop_delay = val;
 
+       } else if (!strcmp(option, "tx_timestamp_offset")) {
+               r = get_ranged_int(value, &val, INT_MIN, INT_MAX);
+               if (r != PARSED_OK)
+                       return r;
+               pod->tx_timestamp_offset = val;
+
+       } else if (!strcmp(option, "rx_timestamp_offset")) {
+               r = get_ranged_int(value, &val, INT_MIN, INT_MAX);
+               if (r != PARSED_OK)
+                       return r;
+               pod->rx_timestamp_offset = val;
+
        } else if (!strcmp(option, "fault_badpeernet_interval")) {
                pod->flt_interval_pertype[FT_BAD_PEER_NETWORK].type = 
FTMO_LINEAR_SECONDS;
                if (!strcasecmp("ASAP", value)) {
diff --git a/default.cfg b/default.cfg
index 9e794ba..840a545 100644
--- a/default.cfg
+++ b/default.cfg
@@ -70,6 +70,8 @@ delay_mechanism               E2E
 time_stamping          hardware
 delay_filter           moving_median
 delay_filter_length    10
+tx_timestamp_offset    0
+rx_timestamp_offset    0
 #
 # Clock description
 #
diff --git a/ds.h b/ds.h
index ea25fbb..00260ed 100644
--- a/ds.h
+++ b/ds.h
@@ -137,6 +137,8 @@ struct port_defaults {
        struct fault_interval flt_interval_pertype[FT_CNT];
        UInteger32 neighborPropDelayThresh; /*nanoseconds*/
        int min_neighbor_prop_delay; /*nanoseconds*/
+       int tx_timestamp_offset; /*nanoseconds*/
+       int rx_timestamp_offset; /*nanoseconds*/
 };
 
 #endif
diff --git a/gPTP.cfg b/gPTP.cfg
index e15a05a..0e155a0 100644
--- a/gPTP.cfg
+++ b/gPTP.cfg
@@ -69,3 +69,5 @@ delay_mechanism               P2P
 time_stamping          hardware
 delay_filter           moving_median
 delay_filter_length    10
+tx_timestamp_offset    0
+rx_timestamp_offset    0
diff --git a/ptp4l.8 b/ptp4l.8
index 687beb6..7dd579b 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -205,6 +205,18 @@ The default is moving_median.
 .B delay_filter_length
 The length of the delay filter in samples.
 The default is 10.
+.TP
+.B tx_timestamp_offset
+Specifies the difference in nanoseconds between the actual transmission
+time at the reference plane and the reported transmit time stamp. This
+value will be added to egress time stamps obtained from the hardware.
+The default is 0.
+.TP
+.B rx_timestamp_offset
+Specifies the difference in nanoseconds between the reported receive
+time stamp and the actual reception time at reference plane. This value
+will be subtracted from ingress time stamps obtained from the hardware.
+The default is 0.
 
 .SH PROGRAM AND CLOCK OPTIONS
 
diff --git a/ptp4l.c b/ptp4l.c
index 83824f7..c18406f 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -92,6 +92,8 @@ static struct config cfg_settings = {
                /* Default to very a large neighborPropDelay threshold */
                .neighborPropDelayThresh = 20000000,
                .min_neighbor_prop_delay = -20000000,
+               .tx_timestamp_offset = 0,
+               .rx_timestamp_offset = 0,
        },
 
        .timestamping = TS_HARDWARE,
-- 
1.7.10.4


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