Re: [dpdk-dev] [RFC] ethdev: add GRE optional fields to flow API

[Andrew Rybchenko <arybchenko@solarflare.com>]

On 5/14/19 10:18 AM, Xiaoyu Min wrote:
> Add GRE's checksum, key, and sequence field to the
> struct rte_flow_item_gre in order to match.
>
> Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
> ---
>   lib/librte_ethdev/rte_flow.h | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
> index 63f84fca65..fb04af3268 100644
> --- a/lib/librte_ethdev/rte_flow.h
> +++ b/lib/librte_ethdev/rte_flow.h
> @@ -847,6 +847,10 @@ struct rte_flow_item_gre {
>   	 */
>   	rte_be16_t c_rsvd0_ver;
>   	rte_be16_t protocol; /**< Protocol type. */
> +	rte_be16_t checksum; /**< chksum for the header and payload, optional.*/
> +	rte_be16_t rsvd1; /**< present when C bit is set, optional. */
> +	rte_be32_t key; /**< application specific key value, optional. */
> +	rte_be32_t sequence; /**< sequence num for the GRE packet, optional. */
>   };
>   
>   /** Default mask for RTE_FLOW_ITEM_TYPE_GRE. */

What is the purpose to match checksum, reserved and sequence number?