[dpdk-dev] [PATCH] doc: update timestamp validity for latency measurement

[Kovacevic, Marko]

> Updated the doc on how packets are marked to identify their timestamp as
> valid and considered for latency measurement.
> 
> Suggested-by: Bao-Long Tran <longtb5 at viettel.com.vn>
> Signed-off-by: Reshma Pattan <reshma.pattan at intel.com>
>
> +Timestamp and latency calculation
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +The Latency stats library marks the time in the timestamp field of the
> +mbuf for the ingress packets and sets the ``PKT_RX_TIMESTAMP`` flag of
> +``ol_flags`` for the mbuf to indicate the marked time as a valid one.
> +At the egress, the mbufs with the flag set are considered having valid
> +timestamp and are used for the latency calculation.

Acked-by: Marko Kovacevic <marko.kovacevic at intel.com>