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netutils/ptpd: Implement IEEE 1588 peer-to-peer (P2P) delay mechanism.

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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>
This commit is contained in:
Daniel P. Carvalho 2026-09-13 13:06:36 -03:00 • committed by Xiang Xiao
parent 7c4ea1dbff
commit 6d6ab39939
4 changed files with 530 additions and 71 deletions
Download patch file Download diff file Expand all files Collapse all files

10
include/netutils/ptpd.h
View file

@ -37,13 +37,20 @@
* Public Types
****************************************************************************/
enum ptp_delay_mechanism_e
{
PTP_DELAY_NONE = 0,
PTP_DELAY_E2E,
PTP_DELAY_P2P
};
struct ptpd_config_s
{
FAR const char *interface;
FAR const char *clock;
bool client_only;
bool hardware_ts;
bool delay_e2e;
enum ptp_delay_mechanism_e delay_mechanism;
bool bmca;
sa_family_t af;
};
@ -106,6 +113,7 @@ struct ptpd_status_s
struct timespec last_transmitted_announce;
struct timespec last_transmitted_delayresp;
struct timespec last_transmitted_delayreq;
struct timespec last_transmitted_pdelayreq;
};
/****************************************************************************