I assume that the FTM (Fine Time Measurement, 802.11mc) functionality, which is implemented in Intel 8260 chipset, relies on a dedicated hardware clock to perform an accurate timestamping of incoming and outgoing packets.
Is it possible to access this clock to get hardware timestamps of network traffic in Linux? When running "ethtool -T wlan0", in which wlan0 corresponds to the Intel 8260 chipset, only the software timestamping seems to be supported. (Some system details: Ubuntu 18.04.1 with kernel 4.15.0-33-generic; iwlwifi 0000:01:00.0: loaded firmware version 34.0.1 op_mode iwlmvm; iwlwifi 0000:01:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208) Is it planned to add the hardware timestamping capability to the Intel 8260 Linux driver in the near future? If not, can you briefly suggest a way how it can be implemented? Would you find technically feasible to use this hardware clock as a clock source for PTP? Are there any other wifi cards with FTM support available, which would allow the hardware packet timestamping and which would be already supported by the Linux wifi driver? Thank you very much! Best regards, Ondrej Daniel
