Hello everyone, I have been working with the i350-T4 ethernet card to test a packet capturing library. I would like this library to be able to deliver a hardware timestamp for each incoming frame. In the datasheet for the i350 controller, one can see that this feature should be supported (p44, table I-4).
I tried to read out the values of these timestamps (I am working with a Linux kernel 3.2.9 - vanilla). To this end, I activated the hardware timestamping on the NIC, issuing an ioctl(SIOCSHWTSTAMP) call and filling the rx_filter field of the hwtstamp_config stucture with the value HWTSTAMP_FILTER_ALL. I then activated the socket option TIMESTAMPING, or-ing all possible values for the timesource. I should get the values of the timestamps for each frame from the control message header I receive by calling recvmsg() on my (raw) socket. In this header, I am supposed to receive the raw hardware timestamp (without correction in regards to the system clock), the corrected hardware timestamp (in the realm of the system clock) and the system timestamp (given higher up in the network stack). For a good 2/3rd of the packets, I receive only the system timestamp, the others being set to 0. Does the i350 controller really produce a hardware timestamp for each incoming frames? If yes, is there another way to read out the values of these timestamps? Are there other options to activate HW timestamping/return these values? Thanks, Arthur ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
