http://bugzilla.suse.com/show_bug.cgi?id=1075876 http://bugzilla.suse.com/show_bug.cgi?id=1075876#c17

--- Comment #17 from Benjamin Poirier bpoirier@suse.com --- https://www.mail-archive.com/netdev@vger.kernel.org/msg231452.html No update from Intel... probably time to send a patch.

The simplest approach would be to remove the problematic TSYNCRXCTL read in e1000e_get_base_timinca() and set the clock parameters unconditionally, like for the 82574 case just below. I've prepared a patch which does that and also adds some logging (for debugging only, not submission). It would also be important to know if the ptp hardware clock (PHC) still works at that point, for that I think we can use phc_ctl which leads to a call of e1000e_phc_gettime().

Please install the updated kernel package from the home:benjamin_poirier:bsc1075876 project once it has finished building (link in comment 15, version should contain "g5227f0d") and install the linuxptp package. Upon a reboot when you see the "No SYSCFI in TSYNCRXCTL [...]" in dmesg, run phc_ctl /dev/ptp0 cmp && sleep 60 && phc_ctl /dev/ptp0 cmp

Please provide the dmesg line with the values after "No SYSCFI in TSYNCRXCTL" and the output of the phc_ctl command.