net-timestamp: SCHED timestamp on entering packet scheduler
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>
diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
index accee72..17437cf 100644
--- a/include/uapi/linux/errqueue.h
+++ b/include/uapi/linux/errqueue.h
@@ -39,6 +39,7 @@
*/
enum {
SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
+ SCM_TSTAMP_SCHED, /* data entered the packet scheduler */
};
#endif /* _UAPI_LINUX_ERRQUEUE_H */