[dpdk-dev] [PATCH v11 5/7] mbuf: add a timestamp to the mbuf for latencystats

[Stephen Hemminger]

On Thu,  9 Mar 2017 16:25:32 +0000
Remy Horton <remy.horton at intel.com> wrote:

> From: Harry van Haaren <harry.van.haaren at intel.com>
> 
> This commit adds a uint64_t to the mbuf struct,
> allowing collection of latency and jitter statistics
> by measuring packet I/O timestamps. This change is
> required by the latencystats library.
> 
> Signed-off-by: Reshma Pattan <reshma.pattan at intel.com>
> Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
> ---
>  lib/librte_mbuf/rte_mbuf.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
> index ce57d47..e0dad6e 100644
> --- a/lib/librte_mbuf/rte_mbuf.h
> +++ b/lib/librte_mbuf/rte_mbuf.h
> @@ -514,6 +514,9 @@ struct rte_mbuf {
>  
>  	/** Timesync flags for use with IEEE1588. */
>  	uint16_t timesync;
> +
> +	/** Timestamp for measuring latency. */
> +	uint64_t timestamp;
>  } __rte_cache_aligned;
>  
>  /**

This creates a hole in the mbuf structure, and won't apply to current
version of mbuf that has priv_size.