missing capabilities about SW timestamping

mystyjj · ‎10-22-2018

Hello,

I am using LinuxPTP on two LS1043 boards. I can see good results when running as Hardware timestamping mode. And I thought I could also use software timestamping.

But when I try to use SW timestamping mode with the "-S" option, it fails:

[root@OpenIL:~]# ptp4l -i eth0 -m -S
ptp4l[15.267]: interface 'eth0' does not support requested timestamping mode
failed to create a clock

And the ethtool shows:

[root@OpenIL:~]# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:

hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)

hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)

PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:

off (HWTSTAMP_TX_OFF)

on (HWTSTAMP_TX_ON)

Hardware Receive Filter Modes:

none (HWTSTAMP_FILTER_NONE)

all (HWTSTAMP_FILTER_ALL)

Obviously, there are missing capabilities about SW timestamping(SOF_TIMESTAMPING_..._SOFTWARE).

Does the LinuxPTP on LS1043 board support the software timestamping?

Or is there any change or support of Linux Kernel configuration need for SW timestamping?

Or it's a driver problem?

Thank you for any help!

yipingwang · ‎11-04-2018

Hello Jason yang,

In the default Kernel configuration file, CONFIG_PTP_1588_CLOCK_DPAA is not enabled, the software timestamping is used by default.

root@ls1043ardb:~# ethtool -T fm1-mac1
Time stamping parameters for fm1-mac1:
Capabilities:
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
PTP Hardware Clock: none
Hardware Transmit Timestamp Modes: none
Hardware Receive Filter Modes: none

Have a great day,
TIC

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