On Wed, Feb 22, 2017 at 09:51:25 -0300, Felipe Sateler wrote: [...]
> The readme suggests ptp4l can detect appropiate devices by itself. If > that is true, then there is no problem to be solved :). Hi, do you mean this? --------------------------------------------------------------------- If the ethtool ioctl is available, then the ptp4l program will use it in order to discover the proper PHC device. --------------------------------------------------------------------- This means that ptp4l can find the proper PHC device (/dev/ptpX) that belongs to a certain ethernet interface (like eth0). Before that, the user had to specify both the ethernet interface (-i) and the PHC device (-p) to use. The ethernet interface still has to be specified either on the command line (-i option) or in the config file. >From the manual page: -------------------------------------------------------------------- -i interface Specify a PTP port, it may be used multiple times. At least one port must be specified by this option or in the configuration file. -------------------------------------------------------------------- > > If that is not true, I suggest the following: > > 1. Convert ptp4l into a template unit, ptp4l@.service > 2. Change the device to be the instance: > ExecStart=ExecStart=/usr/sbin/ptp4l -f /etc/linuxptp/ptp4l.conf -i %i > 3. Do not enable the unit. > 4. Add a udev rule that starts the (properly instanced) service when > it is detected. > > You can see the ifupdown package for a similar approach: there is > ifup@.service, a udev rule, and a helper program (ifupdown-hotplug) > that determines if an instance should be started for the given device. Thanks. I don't fully understand 4. What exactly should be detected, and how? > While I looked at the service files, I noticed you order them after > chrony, ntpdate and other time services. Systemd defines a standard > place for that, so you can replace all those alternatives with > `time-sync.target`. Thanks for the suggestions. Currently, I just look how Fedora sets up the services and do the same, so I'm always open for suggestions how to improve them. Regards, Tino