HW timestamping e1000

[Eric Joyner]

Like Konstantin said, it might only be possible on some e1000 cards. Could
you tell me which card you're using? If the device name shows up as igb,
then it's likely it does support it.

That said, I'm not an expert on HW timestamping, so I'm not sure what
features are supported or how well they're implemented. I can try
forwarding some of your questions to someone who knows more about it at
Intel, if you have any.

- Eric

On Tue, Jun 2, 2020 at 4:54 AM Konstantin Belousov <kostikbel at gmail.com>
wrote:

> On Tue, Jun 02, 2020 at 10:46:00AM +0000, Gabriel.Moyano at dlr.de wrote:
> > Hi everybody,
> >
> > Currently I am writing a piece of code to test HW timestamping on e1000
> during reception, which runs on FreeBSD 12, but unfortunately it seems that
> it isn't working.
> >
> > The socket is created and configured as follows:
> >
> > sockfd = socket(AF_INET, SOCK_DGRAM, 0);
> > int on = 1;
> > setsockopt(sockfd, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on));
> >
> > After recvmsg() is called, cmsg_type of received control messages are
> printed out with help of the control message routines (
> https://www.freebsd.org/cgi/man.cgi?query=CMSG_DATA). SCM_TIME_INFO
> should be printed out but it's not.
> >
> > Is there any configuration missing? Does e1000 support HW timestamping
> right?
> >
> > I will appreciate any help.
>
> Hardware timestamping is only implemented for Mellanox ConnectX-4 and hier,
> and Chelsio Terminators (T4 and newer ?).  It might be doable for Intel
> some cards, but not all of them.
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