The MAC latches a hardware receive timestamp later than the frame
reaches the wire, because of the PHY and the clock domain crossing.
This fixed delay is the ingressLatency port parameter of IEEE 1588 and
shows up as a constant phase error between the local and the master
clock.
Subtract the configured latency from every hardware receive timestamp
in ptp_getrxtime(), the single place where they enter the daemon, so
Sync, Delay_Resp and the peer delay messages are all corrected.
- Add CONFIG_NETUTILS_PTPD_INGRESS_LATENCY_NS (default 0, which applies
no compensation).
- Add the -I option to override it at run time.
- Add ingress_latency_ns to struct ptpd_config_s.
Software timestamps are not affected.
Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
Implements the Peer-to-Peer (P2P) transparent clock delay measurement
mechanism (IEEE 1588-2008 §11.4 / IEEE 802.1AS / IEC/IEEE 61850-9-3)
in apps/netutils/ptpd:
- Add PTP_MSGTYPE_PDELAY_REQ, PTP_MSGTYPE_PDELAY_RESP, and
PTP_MSGTYPE_PDELAY_RESP_FOLLOW_UP definitions and structs in ptpv2.h.
- Define IEEE 1588-2008 Annex F peer delay multicast MAC address
01:80:c2:00:00:0e and Annex D peer delay IP address 224.0.0.107.
- Replace bool delay_e2e with enum ptp_delay_mechanism_e (PTP_DELAY_NONE,
PTP_DELAY_E2E, PTP_DELAY_P2P) in include/netutils/ptpd.h.
- Add -P CLI option in system/ptpd/ptpd_main.c with mutual exclusion
check against -E, and display last_transmitted_pdelayreq in status.
- Implement responder logic in ptp_process_pdelay_req() sending
Pdelay_Resp (t2) and Pdelay_Resp_Follow_Up (t3) regardless of master
or slave state.
- Implement requester logic in ptp_send_pdelay_req() gated on the
physical link without requiring prior BMCA master selection.
- Implement ptp_process_pdelay_resp() and
ptp_process_pdelay_resp_followup() using canonical mean path delay
formula ((t4 - t1) - (t3 - t2)) / 2.
- Refactor path delay bounds checking and moving average filter into
ptp_record_path_delay() shared across E2E and P2P mechanisms.
- Set PTP version 2.0 and controlField 0x05 in Pdelay_Req, Pdelay_Resp
and Pdelay_Resp_Follow_Up, and in the own-identity header, so that
peers such as linuxptp accept the messages.
- Clear pdelay_waiting_followup when a new Pdelay_Req is sent, so an
orphaned Pdelay_Resp_Follow_Up from an abandoned cycle is not paired
with stale timestamps.
- Warn at startup when P2P is selected without CONFIG_SCHED_TICKLESS,
since a tick-driven clock cannot resolve the peer delay.
- Skip IP multicast join/leave handling for AF_PACKET.
Assisted-by: Claude:claude-sonnet-5
Assisted-by: Gemini:gemini-3.8-flash-medium
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
fix compile warning when only enable PTPD_CLIENT or PTPD_SERVER
ptpd.c:493:38: error: 'CONFIG_NETUTILS_PTPD_PRIORITY1' undeclared (first
use in this function); did you mean 'CONFIG_NETUTILS_PTPD_CLIENT'?
ptpd.c:494:39: error: 'CONFIG_NETUTILS_PTPD_CLASS' undeclared (first use
in this function); did you mean 'CONFIG_NETUTILS_PTPD_CLIENT'?
ptpd.c:495:39: error: 'CONFIG_NETUTILS_PTPD_ACCURACY' undeclared (first
use in this function); did you mean 'CONFIG_NETUTILS_PTPD_DEBUG'?
ptpd.c:498:38: error: 'CONFIG_NETUTILS_PTPD_PRIORITY2' undeclared (first
use in this function); did you mean 'CONFIG_NETUTILS_PTPD_CLIENT'?
ptpd.c:502:36: error: 'CONFIG_NETUTILS_PTPD_CLOCKSOURCE' undeclared
(first use in this function); did you mean
'CONFIG_NETUTILS_PTPD_STACKSIZE'?
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
What works:
- Basic server & client operation
- Transmission and reception of announce, sync and follow-up
Still missing:
- SO_TIMINGS for getting more precise packet timestamps
- Implementation of delay_req and delay_resp packets
- Status and stop interfaces for the daemon
