Dear Jake, thanks for the fast reply:
On 11.01.19 18:49, Keller, Jacob E wrote:
On Fri, 2019-01-11 at 18:03 +0100, Timo Korthals wrote:Dear ptp4l-devs,Hi,we try to sync embedded devices, which are only capable of PTP_TWO_STEP=FALSE (aka twoStepFlag=0 aka one-way-sync aka PTP_Sync=1) syncing, with our Ubuntu Linux host (System overview below). When we run the self build ptp4l via "./ptp4l -m -l7 -2 -H -i enp0s25 -E -f /etc/ptp4l.conf" (see config etc. below), the execution hangs for all ptp4l versions > 1.7 at "INITIALIZING to LISTENING on INIT_COMPLETE". If we comment the corresponding line [1] where ptp4l hangs, its start sending the SYNC_MESSAGE etc. and the log goes on with:It sounds like your device driver (and possibly kernel changes, I don't remember offhand) needs to support the one step configurations. We can't help you with your device driver, especially if it's not public/open-source.
The Kernel is the vanilla Ubuntu 4.18 Kernel from canonical's ppa for Ubuntu 18.04: https://packages.ubuntu.com/bionic/kernel/linux-image-4.18.0-13-generic All flags should be alright since ptp4l compiles with -DHAVE_ONESTEP_SYNC: https://github.com/richardcochran/linuxptp/blob/5219b6417faa5248e6093828732ab9fc713b82be/incdefs.sh#L82 The Linux igb driver for this NIC is pretty open source I guess: https://github.com/torvalds/linux/tree/master/drivers/net/ethernet/intel/igb
Ok, that's maybe a thing since no intel driver in the Linux Kernel supports this field: https://github.com/torvalds/linux/search?q=HWTSTAMP_TX_ONESTEP_SYNC&unscoped_q=HWTSTAMP_TX_ONESTEP_SYNC The two other chips supporting ONESTEP_SYNC are the TI dp83640 and the Microchip LAN7430/1. However, I only found chip samples but no buyable networkcards having these chips. Does someone know network cards with these chips or at least other network cards with HWTSTAMP_TX_ONESTEP_SYNC support?Specifically you're looking for HWTSTAMP_TX_ONESTEP_SYNC. Your kernel must be new enough to support the field. Additionally, you will need to have your driver updated to correctly enable the request for HWTSTAMP_TX_ONESTEP_SYNC.
Note that as far as I'm aware this only works for sync packets, and no kernel support for one-step of other messages has been written. This is primarly because no hardware has been widely available to test such a feature. (i.e. one-step syncing of peer delay messages)
Ok, so I only need the SYNC messages.However, since removing the line [1] starts one-way syncing, wouldn't it be a feasable way to do it in software (with the lack of precision)?
There is just the copy of the timestamps missing, right?
Hope this helps. Regards, Jake
Greetings, Timo -- Timo Korthals, M.Sc. Universität Bielefeld AG Kognitronik & Sensorik Exzellenzcluster Cognitive Interaction Technology (CITEC) Inspiration 1 (Zehlendorfer Damm 201) 33619 Bielefeld - Germany Office : 3.413 Phone : +49 521 106-67367 eMail : tkorth...@cit-ec.uni-bielefeld.de Internet: http://www.ks.cit-ec.uni-bielefeld.de/
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