Running ptp4l with hardware timestamping on RV2?

I got Orange PI RV2 many months earlier to experiment with RISCV.

I installed initially Orange PI Ubuntu and recently Armbian, I was able to cross compile RV2 image using RPI5 which is great.

To my big surprise the RV2 board ethernet show it is supporting hardware timestamping by looking at ethtool -T

root@orangepirv2:/sys/class/net/eth0/queues# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:
        hardware-transmit
        software-transmit
        hardware-receive
        software-receive
        software-system-clock
        hardware-raw-clock
Hardware timestamp provider index: 0
Hardware timestamp provider qualifier: Precise (IEEE 1588 quality)
Hardware Transmit Timestamp Modes:
        off
        on
Hardware Receive Filter Modes:
        none
        all
        ptpv1-l4-event
        ptpv1-l4-sync
        ptpv1-l4-delay-req
        ptpv2-l4-event
        ptpv2-l4-sync
        ptpv2-l4-delay-req
        ptpv2-event
        ptpv2-sync
        ptpv2-delay-req
 

However when trying to run ptp4l in either master or slave with "ptp4l -i eth0 -2 -m --tx_timestamp_timeout 100 -s" or "ptp4l -i eth0 -2 -m --tx_timestamp_timeout 100"

ptp4l complained it cannot receive timestamp when in slave mode when SYNC is received, or in master when DELAY_REQ is received.

ptp4l in master mode can send SYNC and receive timestamp for subsequent FOLLOWUP packet, so for tx RV2 ethernet can return the tx timestamp, but for receive it does not work.

I check the datasheet of K1 ethernet and PTP section registers, nothing seem wrong.

I just suspect maybe the filter for PTP packet to be timestamped maybe not working.

root@orangepirv2:/sys/class/net/eth0/queues# /root/Downloads/linuxptp-code/ptp4l -i eth0 -2 -m --tx_timestamp_timeout 100
ptp4l[120447.510]: selected /dev/ptp0 as PTP clock
ptp4l[120447.512]: port 1 (eth0): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120447.513]: port 0 (/var/run/ptp/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120447.513]: port 0 (/var/run/ptp/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120453.808]: port 1 (eth0): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[120453.808]: selected local clock c0742b.fffe.fcd1e0 as best master
ptp4l[120453.808]: port 1 (eth0): assuming the grand master role
ptp4l[120492.717]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120493.027]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120494.187]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120494.332]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120495.579]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120496.234]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120496.659]: port 1 (eth0): received DELAY_REQ without timestamp
ptp4l[120498.583]: port 1 (eth0): received DELAY_REQ without timestamp
 

root@orangepirv2:/sys/class/net/eth0/queues# /root/Downloads/linuxptp-code/ptp4l -i eth0 -2 -m --tx_timestamp_timeout 100 -s
ptp4l[120550.932]: selected /dev/ptp0 as PTP clock
ptp4l[120550.934]: port 1 (eth0): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120550.935]: port 0 (/var/run/ptp/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120550.935]: port 0 (/var/run/ptp/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[120550.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120551.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120551.997]: port 1 (eth0): new foreign master 2ccf67.fffe.1f909a-1
ptp4l[120552.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120553.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120554.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120555.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120555.997]: selected best master clock 2ccf67.fffe.1f909a
ptp4l[120555.997]: port 1 (eth0): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[120556.996]: port 1 (eth0): received SYNC without timestamp
ptp4l[120557.996]: port 1 (eth0): received SYNC without timestamp
 

the driver is driver/net/ethernet/spacemit for Armbian, kernel 6.18 

from Orangepi they use older kernel 6.6 and driver/net/ethernet/k1

the two drivers are identical with minor changes, the section for ptp handling looks identical.

I hope to find kernel dev here who has tried ptp4l with the Spacemit ethernet with PTP support for help.

I work a lot on PTP so anytime I see a board supporting hardware timestamping, I just want to try.  So far only boards I know with hw timestamping is RPI5 and BeagleBoneBlack (even if only 100M).

Have a good day!

Chi-Thanh