Hi Richard, On Thu, Jun 25, 2020 at 01:51:58PM +0200, Marco Spanghero wrote: > I have a question regarding your comment, Richard. It might be worth moving > this to another thread. > > PTP over WiFi is not supported in Linux for which reason? Is it due to WiFi > standard, linux driver or PTP implementation?
Time stamping on WiFi interfaces would require support in the Linux kernel wireless stack. It would not be a huge change, but some work would need to be done. However, there is little point in doing this work. The fundamental blocking issue is the proprietary firmware blobs running in the radio chips. These would need to be changed to support such functionality. Most likely we would need both the firmware source code and the documentation of the radio chips themselves. Based on my industry experience, I doubt anything will ever change in this particular area. The blame lies squarely on the vendors of WiFi chips. Sorry, Richard We are actually working with PTP (and evolutions thereof) in wireless (WiFi6). Or trying to. In regards to driver support, we are using the Intel AX200 (iwlwifi), kernel 5.7. ethtool states that there are only receive timestamping capabilities. How can I check in the iwlwifi code if TX capabitilies are also there? Or if we can propose something? Best Regards, Rute Sofia -- fortiss · Landesforschungsinstitut des Freistaats Bayern An-Institut Technische Universität München Guerickestraße 25 80805 München Germany Tel.: +49 (89) 3603522 170 Fax: +49 (89) 3603522 50 E-Mail: so...@fortiss.org<mailto:so...@fortiss.org> https://www.fortiss.org/ Amtsgericht München: HRB: 176633 USt-IdNr.: DE263907002, Steuer-Nr.: 143/237/25900 Rechtsform: gemeinnützige GmbH Sitz der Gesellschaft: München Geschäftsführer: Dr. Harald Rueß, Thomas Vallon Vorsitzender des Aufsichtsrats: Dr. Manfred Wolter
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