tree 83f4b5e777a13535434be99bee2e764a6677e647
parent 4ed2d765dfaccff5ebdac68e2064b59125033a3b
author Willem de Bruijn <willemb@google.com> 1407204710 -0400
committer David S. Miller <davem@davemloft.net> 1407281754 -0700

net-timestamp: ACK timestamp for bytestreams

Add SOF_TIMESTAMPING_TX_ACK, a request for a tstamp when the last byte
in the send() call is acknowledged. It implements the feature for TCP.

The timestamp is generated when the TCP socket cumulative ACK is moved
beyond the tracked seqno for the first time. The feature ignores SACK
and FACK, because those acknowledge the specific byte, but not
necessarily the entire contents of the buffer up to that byte.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>