Since I think this is an issue with the 82576 chip, I am sending this to
both the ptp and e1000 lists.
A few months ago I had trouble with the INTEL 82576 and PTP. I got
errors like: recvmsg tx timestamp failed: Resource temporarily unavailable.
It was suggested to switch to a newer kernel, which I did.
I went to kernel 3.7.10 and ptp 1.1 (which were current at that time).
PTP worked great for port 0.
The 82576 has 2 ports. In our design the first port is connected to an
RJ45, the second to a SFP.
I never had ptp working with the SFP port. It constantly gives the
"recvmsg tx timestamp failed" errors.
At this moment I switched to ptp 1.3 and used the 4.3.0 igb driver from
sourceforge.
The SFP is still not working. The error message is:
poll tx timestamp timeout
port 1: send delay request failed
The RJ45 port is working, but every now and then the same error occurs.
On the errate sheet of the 82576 I found the following:
37. TimeSync: Missing Tx timestamps in SerDes mode
Problem: When transmitting a TimeSync packet in SerDes mode,
there is a probability that the
timestamp will not be sampled in the Tx Timestamp Value
registers and thus
TSYNCTXCTL.TXTT will not be set.
There is no issue when using 10/100/1000 BASE-T(Copper) mode.
Implication: Missing timestamps make it difficult for the
software to effectively implement the
TimeSync functionality.
My questions are:
- Could this error on the errato sheet be the cause that our SFP is not
working with PTP?
- What could be the cause of spurious errors on the RJ45 port with
linuxptp_1.3 ( linuxptp_1.1 works good)
- Are there people who use ptp with the 82576 chip without problems?
Many thanks,
Gert-Jan Roskam
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