I think I have a workable solution for the RTT samples and I have
tested it with success.
The concept is to use a dccp_epoch again, but to measure it in
units of `hundredths of milliseconds' (that is, 10s of microseconds).
This is native RFC 4340 format, with that the counter wraps around
every 11.9 hours - which should be more than enough for most DCCP
applications.
It splits into three patches, the first is a re-send:
Patch #1: Reuses ktime_get_real() for CCID3 - as sent earlier.
Patch #2: Provide 10s of microsecond timesource, this is the heart
of the patch set, revives dccp_timestamp in a new format.
Patch #3: Demotes dccp_sample_rtt() to just to very simple tasks
and does the remaining fixes for
* CCID3 SYN RTT
* all calls within ccid3.c
Tested it, works fine so far.
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