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ntp: save PTP correction from NTP-over-PTP messages

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When the RX duration is known (HW timestamping), save the PTP correction
from received PTP messages in the local RX timestamp.
This commit is contained in:
Miroslav Lichvar
2023-09-26 12:22:47 +02:00
parent b0267475e3
commit 6372a9f93f
3 changed files with 19 additions and 6 deletions
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9
ntp_io_linux.c
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@@ -559,7 +559,7 @@ process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
NTP_Local_Timestamp *local_ts, int rx_ntp_length, int family,
int l2_length)
{
double rx_correction, ts_delay, local_err;
double rx_correction = 0.0, ts_delay, local_err;
struct timespec ts;
poll_phc(iface, &local_ts->ts);
@@ -600,6 +600,10 @@ process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
local_ts->ts = ts;
local_ts->err = local_err;
local_ts->source = NTP_TS_HARDWARE;
local_ts->rx_duration = rx_correction;
/* Network correction needs to include the RX duration to avoid
asymmetric correction with asymmetric link speeds */
local_ts->net_correction = rx_correction;
}
/* ================================================== */
@@ -723,6 +727,7 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
{
struct Interface *iface;
int is_tx, ts_if_index, l2_length;
double c;
is_tx = event == SCH_FILE_EXCEPTION;
iface = NULL;
@@ -783,7 +788,7 @@ NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
return 1;
}
if (!NIO_UnwrapMessage(message, local_addr->sock_fd))
if (!NIO_UnwrapMessage(message, local_addr->sock_fd, &c))
return 1;
if (message->length < NTP_HEADER_LENGTH || message->length > sizeof (NTP_Packet))