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>
diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
index 17437cf..07bdce1 100644
--- a/include/uapi/linux/errqueue.h
+++ b/include/uapi/linux/errqueue.h
@@ -40,6 +40,7 @@
enum {
SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
SCM_TSTAMP_SCHED, /* data entered the packet scheduler */
+ SCM_TSTAMP_ACK, /* data acknowledged by peer */
};
#endif /* _UAPI_LINUX_ERRQUEUE_H */