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From: Paul Emmerich <emmericp@net.in.tum.de>
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To: terry.montague.1980@btinternet.com
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Subject: Re: [dpdk-users] Intel X550 Receive timestamping for all packets
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Hi,

> terry.montague.1980@btinternet.com:
> Hi all,
> Has anyone tried modifying the ixgbe PMD driver to allow an Intel X550 =
card to insert the extra 8 bytes of data at the end of each receive =
message, the 8 bytes containing the receive SYSTIME  timestamp ?

I've had that open as a todo for a year or so, and I've implemented it =
after seeing your email :)

> I've adjusted TYPE in TSYNCRXCTL to be "all packets" and set =
TSIP_UT_EN. I get the 8 bytes of data appended to all packets, but the =
controller doesn't populate the memory - the contents are left unchanged =
when transmitted.
> TS and TSIP are both set in the received RDESC descriptor (along with =
the receive byte count increasing by 8 bytes) so the adaptor is =
definitely doing something.

My implementation is here: =
https://github.com/libmoon/libmoon/commit/52f0b8cab580c8cf0579a03324cf0ac7=
f697e6e9#diff-0977b88594c9ac952093605f7aa091dcL109
Tested on an X550 and it works fine as far as I can tell from looking at =
a few histograms of inter-arrival times.


Paul=