Hello Richard,
thanks for the answer. Looking into iwlwifi, (iwlmvm, as this is an Intel AX200), time stamping seems to be supported here, right? https://lxr.missinglinkelectronics.com/linux+v3.11/drivers/net/wireless/iwlwifi/mvm/mac80211.c static void iwl_mvm_mac_tx<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=iwl_mvm_mac_tx>(struct ieee80211_hw<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=ieee80211_hw> *hw<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=hw>, 268<https://lxr.missinglinkelectronics.com/linux+v3.11/drivers/net/wireless/iwlwifi/mvm/mac80211.c#L268> struct ieee80211_tx_control<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=ieee80211_tx_control> *control<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=control>, 269<https://lxr.missinglinkelectronics.com/linux+v3.11/drivers/net/wireless/iwlwifi/mvm/mac80211.c#L269> struct sk_buff<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=sk_buff> *skb<https://lxr.missinglinkelectronics.com/linux+v3.11/+code=skb>) In the linuxptp page, it is said: " Note the software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE) capability. If this is lacking, then the MAC cannot be used at all. However, adding this capability entails adding a single line of code to the device driver. http://linuxptp.sourceforge.net/ "So, you need to add one line, skb_tx_timestamp(), into the MAC driver in order to get ptp4l working with SW timestamping on your hardware. " https://sourceforge.net/p/linuxptp/mailman/message/37044948/ " Is this the possible issue? Do I need to add skb_tx_timestamp(skb)? Thanks for the support. 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> http://www.fortiss.org<http://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 ________________________________ From: Richard Cochran <richardcoch...@gmail.com> Sent: Wednesday, September 9, 2020 7:38:28 PM To: Rute Sofia Cc: linuxptp-users@lists.sourceforge.net Subject: Re: [Linuxptp-users] SOF_TIMESTAMPING_TX_SOFTWARE missing On Wed, Sep 09, 2020 at 02:54:45PM +0000, Rute Sofia wrote: > 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? Get a copy of the Linux kernel sources and look at the wifi stack in net/mac80211 and your driver in drivers/net/wireless/intel/iwlwifi Cheers, Richard
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