Re: [Linuxptp-users] Is there any interface between ptp driver and linuxptp for controlling the ptp hardware?

[Takahiro S. <tsh...@gm...>]

Hello,

> Yes, I agree. You will have to live with a work around. Your hardware
> > > really cannot support IEEE Std 1588-2008. For peer delay mechanism via
> > > L2, you must accept two *different* MAC addresses.
> > >
> > > Your driver will have to program the correct multicast MAC address
> > > based on the SIOCSHWTSTAMP ioctl. Your driver can only support certain
> > > values for rx_filter:
> > >
> > >  HWTSTAMP_FILTER_PTP_V2_L4_EVENT  SA = 01:00:5e:00:01:81 (E2E mechanism
> > > only)
> > >  HWTSTAMP_FILTER_PTP_V2_L2_EVENT  SA = 01:1b:19:00:00:00 (E2E mechanism
> > > only)
> > >  HWTSTAMP_FILTER_PTP_V2_EVENT     not supported!
> > >
> > >
> > I have some question.
> > 1. If SA means Distination MAC address (Station Address register 1-6),
> > could you tell me the usage of the above ioctl?
>
> Sorry for the confusion. I meant SA = Station Address.
>
> > Now linuxptp uses HWTSTAMP_FILTER_PTP_V2_EVENT. If I implement the driver
> > like the above, I modify the linuxptp using
> HWTSTAMP_FILTER_PTP_V2_L4_EVENT
> > or HWTSTAMP_FILTER_PTP_V2_L2_EVENT and test them?
>
> Yes that is right.
>
> > I can accept two *different * Source MAC address for Rx message. I can
> not
> > accept two *different* Destination MAC address for RX message.
>
> Yes, and that is why the hardware will not fully support PTPv2.
>
> How about the following implementation?

HWTSTAMP_FILTER_PTP_V2_L4_EVENT  SA = 01:00:5e:00:01:81 (E2E mechanism only)
HWTSTAMP_FILTER_PTP_V2_L2_EVENT  SA = 01:1b:19:00:00:00 (E2E mechanism only)
HWTSTAMP_FILTER_PTP_V2_EVENT     The same as HWTSTAMP_FILTER_PTP_V2_L4_EVENT

I want that the user uses linuptp and EG20T driver by default.
It seems that the current linuxptp does not use SA = 01:1b:19:00:00:00 by
default.
If so, I want to implement like the above.
It is the limitation of the EG20T ptp driver.

Thanks and Best regards,
Takahiro Shimizu