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List:       dpdk-users
Subject:    [dpdk-users] PTP client over DPDK
From:       Philippe CORNET <p.cornet () deltatec ! be>
Date:       2019-09-05 14:23:13
Message-ID: 399f94faf87f41f59a9786aa245e94b0 () deltatec ! be
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Hi all,

I am currently wondering what is the best/cheapest way to implement a PTP client over \
DPDK:


1.       Implementing a custom PTP client over DPDK.
or

2.       Using LinuxPTP (http://linuxptp.sourceforge.net/) through KNI interface.

For solution 1, we can start from the PTP sample program, but it certainly requires \
quite some time to develop a smart and accurate client.

For solution 2, I have a proof-of-concept which works quite well, but it requires \
these modifications:

-          To build KNI with flag CONFIG_RTE_KNI_PREEMPT_DEFAULT=n to reduce latency \
of KNI

-          To patch kni_net.c to add a software timestamping of the skb \
(skb_tx_timestamp(skb)) in tx routine.

-          To patch LinuxPTP to avoid it checking the software-transmit time stamping \
capability of the KNI driver.

Solution 2 is tempting because it almost costs nothing in term of development time, \
but I am not sure that it is the good way to proceed...

Does anyone has strong arguments for or against this second solution?

Thanks,
Philippe


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