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134f4b39df
Support enabling TX timestamping for some skbs, and track them until packet completion. Generate software SCM_TSTAMP_COMPLETION when getting completion report from hardware. Generate software SCM_TSTAMP_SND before sending to driver. Sending from driver requires changes in the driver API, and drivers mostly are going to send the skb immediately. Make the default situation with no COMPLETION TX timestamping more efficient by only counting packets in the queue when there is nothing to track. When there is something to track, we need to make clones, since the driver may modify sent skbs. The tx_q queue length is bounded by the hdev flow control, which will not send new packets before it has got completion reports for old ones. Signed-off-by: Pauli Virtanen <pav@iki.fi> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Linux kernel
============
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