Hi Jacob, Thank you for your input I will check with the driver developer regarding these options
Also, I was able to resolve the timestamp issue on my setup by changing the location where I declared skb_tx_timestamp(skb) in xilinx_emacps driver Regards, Anmol -----Original Message----- From: Jacob Keller <jacob.e.kel...@intel.com> Sent: Thursday, April 1, 2021 11:01 PM To: linuxptp-users@lists.sourceforge.net Subject: Re: [Linuxptp-users] [EXTERNAL] Re: ptp4l gives tx timestamp polling timeout issue On 3/31/2021 8:56 AM, Dhanuka, Anmol via Linuxptp-users wrote: > 1. The configuration for one-step sync timestamp insertion in DP83640 > (Page 5, register 0x0016, bit 15) is getting cleared on running > ptp4l. Is there some option I need to provide in the ptp4l command > to run one-step mode? You need to enable some configuration options to use one-step mode in ptp4l. Check the manual page and search for one step. > 2. Can you please clarify how is ptp4l fetching the hardware timestamps > from the PHY? Is it polling for some event hardware interrupts to > read the timestamp registers of PHY? Want to understand if I missed > routing some signals in Vivado. ptp4l relies on the standard Linux socket interface for timestamps where a timestamp is reported for a packet over the socket error queue. ptp4l will send a packet with the timestamp request, and then wait for about 1ms on the socket error queue to get a response back. It's up to the driver and hardware how the internal PHY timestamp is captured, and not something ptp4l itself cares about. This is a device driver question you might want to ask the driver developer. If that's you, then I suggest reading the documentation files for PTP from the Linux kernel documentation for how to implement the driver correctly. > 3. If I want to enable software based timestamping options as well, > which kernel options need to be enabled? > Your driver must be implemented to call the proper software timestamp function in its transmit path, and it must correctly enable the SOF_TIMESTAMPING_SOFTWARE flag in its ethtool .get_ts_info callback. >From the output you gave, it appears that the driver does not support software >timestamps. _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
