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net-timestamp: SCHED timestamp on entering packet scheduler

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Kernel transmit latency is often incurred in the packet scheduler.
Introduce a new timestamp on transmission just before entering the
scheduler. When data travels through multiple devices (bonding,
tunneling, ...) each device will export an individual timestamp.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2014-08-04 22:11:48 -04:00 • committed by David S. Miller
parent 09c2d251b7
commit e7fd288538
6 changed files with 31 additions and 7 deletions
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3
include/uapi/linux/net_tstamp.h
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@ -21,8 +21,9 @@ enum {
SOF_TIMESTAMPING_SYS_HARDWARE = (1<<5),
SOF_TIMESTAMPING_RAW_HARDWARE = (1<<6),
SOF_TIMESTAMPING_OPT_ID = (1<<7),
SOF_TIMESTAMPING_TX_SCHED = (1<<8),
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_ID,
SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_TX_SCHED,
SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) |
SOF_TIMESTAMPING_LAST
};