HW timestamping e1000

Gabriel.Moyano at dlr.de Gabriel.Moyano at dlr.de
Thu May 28 11:31:08 UTC 2020

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.

Best regards,

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Institute for Software Technology | SC-OSS | Lilienthalplatz 7 | 38108 Braunschweig  | Germany

Gabriel Moyano | Research Scientist in Onboard Software Systems group
gabriel.moyano at dlr.de<mailto:gabriel.moyano at dlr.de>

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