Needing help for igb

[Plank, Stefan]

Hello,

I have studied documentation for IEEE 1588 PTP and Intel 82576 with IGB driver.
But I don't get HW timestamps in sending PTP packets?

I am using
linux kernel 2.6.37.6  (from 2.6.30 it should work)
igb driver 3.2.9  (latest)

I downloaded the ptpd which works without hw timestamping very well.
When adding hw support not this happens what I expected?
Still working I get logs "(ptpd error) received truncated ancillary data" periodically.

As described in linux documentation following seems to be (additionally) necessary:
ioctl(sock, SIOCSHWTSTAMP, &hwtstamp) with HWTSTAMP_TX_ON
setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &temp, sizeof(int))
so_timestamping_flags = SOF_TIMESTAMPING_TX_HARDWARE | SOF_TIMESTAMPING_RX_HARDWARE | SOF_TIMESTAMPING_SYS_HARDWARE;
setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &so_timestamping_flags, sizeof(so_timestamping_flags))

Can you give me a hint how it works as wanted?
Does the 82576 place the timestamps (only) in ptp packets?
The offset in the packets is not always the same - how is this handled?

What I tested was to zero the timestamp in the buffer before calling sendto().
But 82576 hasn't written to the transmitted ptp packet?

Looking forward to your answer I say thank you.

Kind regards
Stefan Plank
Development

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