Hi,
I am trying to achieve precise time synchronization via wifi interface.
I used intel AX201 card, certified with TimeSync, 802.11v, mc. So I
assume it has the capability to do hardware time stamp when running
applications like linux ptp (http://linuxptp.sourceforge.net/) and gptp
(https://github.com/Avnu/gptp). However I get error that seems to
suggest the timestamp mode is not supported.
After reading some source code, I discover that the /ptp4l/ application,
or /gptp/, or /ethtool/ /-T/ , they all use a system call /ioctl/, which
uses ethtool_ops call back to determine whether the hardware can do
software/hardware timestamp.
However when searching in the driver/net/wireless/iwlwifi directory, I
don't see anywhere /ethtool_ops/ is being implemented in the driver. So
this most likely is why all user space tools I tried seem to determine
the card cannot do hardware and also software (driver level) transmit
timestamp.
Can someone tell me how I could run ptp like application to fully make
use of the Timesync feature of intel card?
Some more details below:
root@localhost:/debug/tracing# ethtool -i wlp2s0
driver: iwlwifi
version: 5.4.6-050406-generic
firmware-version: 48.4fa0041f.0
expansion-rom-version:
bus-info: 0000:02:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
root@localhost:/debug/tracing# ethtool -T wlp2s0
Time stamping parameters for wlp2s0:
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
