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Published 20 hours ago • verified publisher icon dhalperi

How to get transmit timestamp?

Open Statisticss opened this issue 6 years ago • 0 comments

Hi all,

Currently I'm trying to get the transmit TSF timestamp, in addition to the receive timestamp provided by this tool. However, I cannot find the place where the NIC report this info.

I believe the NIC should report the TX status to the driver after it received ACK or time out. As a result, I traced the functions called in the driver, and at last, I found a function 'iwl_trans_pcie_tx' in tx.c which says:

/*

  • At this point the frame is "transmitted" successfully
  • and we will get a TX status notification eventually. */

But I cannot find when they get this TX status notification. Could anyone help me or give some hint? Thanks a lot!

Statisticss avatar Mar 30 '18 02:03 Statisticss