On Tue, Aug 03, 2021 at 02:31:25PM +0300, Aya Levin via Linuxptp-devel wrote:
> I would like to push an infra structure hook to the ptp4l. This hook allows
> vendors to estimate the HW time-stamp closer to the actual transmission and
> reach better accuracy. The hook will receive the HW timestamp as an input
> and will be able to manipulate it.
In fact we already have a "hook" to send time stamps to an external
application.
See TLV_SLAVE_RX_SYNC_TIMING_DATA and TLV_SLAVE_DELAY_TIMING_DATA_NP.
You can enable this using option:
slave_event_monitor
Specifies the address of a UNIX domain socket for event monitor-
ing. A local monitoring client bound to this address will re-
ceive SLAVE_RX_SYNC_TIMING_DATA and SLAVE_DELAY_TIMING_DATA_NP
TLVs. The default is the empty string (disabled).
Just run ptp4l with --free_running and then let your application
receive the time stamps, "manipulate" them, and then discipline the
clock. I think that covers your use case exactly.
HTH,
Richard
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