I would like to join the discussion as I am also working with a 1-step TC hardware.
The Microchip KSZ9477/9563/9567 performs forwarding of SYNC messages in hardware by default (if not explicitly disabled, e.g. for BC). For this type of hardware, ptp4l should not forward Sync messages at all (when in TC mode). But in order to use the hardware TC mode of these chips, the hardware needs to know the peer delays which have been measured by ptp4l. So an additional interface to the kernel for writing the current peer delays would be required for making use of this. On Tuesday, 1 December 2020, 20:23:16 CET, Richard Cochran wrote: > On Tue, Dec 01, 2020 at 05:14:38PM +0100, Volodymyr Bendiuga wrote: > > From: Volodymyr Bendiuga <volodymyr.bendi...@westermo.se> > > > So what HW actually does this? I just looked... > > Only one driver implements HWTSTAMP_TX_ONESTEP_P2P, namely > drivers/ptp/ptp_ines.c. It have this HW for testing. That one > updates the originTimestamp of Sync messages, IIRC. The Microchip KS9477/9563/9567 also implement HWTSTAMP_TX_ONESTEP_P2P: https://patchwork.ozlabs.org/project/netdev/list/?series=217835 regards Christian ________________________________ [http://assets.arri.com/media/sign/2020-04-03-E-mail-signature-Stellar2_V1.jpg] <https://microsites.arri.com/stellar/> Get all the latest information from www.arri.com<https://www.arri.com/>, Facebook<https://www.facebook.com/TeamARRI>, Twitter<https://twitter.com/ARRIChannel>, Instagram<https://instagram.com/arri> and YouTube<https://www.youtube.com/user/ARRIChannel>. Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: München - Registergericht: Amtsgericht München - Handelsregisternummer: HRA 57918 Persönlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: München - Registergericht: Amtsgericht München - Handelsregisternummer: HRB 54477 Geschäftsführer: Dr. Michael Neuhäuser; Stephan Schenk; Walter Trauninger; Markus Zeiler _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
