[dpdk-dev] [RFC] ethdev: introduce GENEVE header extension item

[Ori Kam]

Hi 
PSB,

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Shiri Kuzin
> 
> The Geneve tunneling protocol is designed to allow
> the user to specify some data context on the packet.
> The header extension options is the mean intended
> to present the user data. These ones are implemented
> in TLV (Type-Length-Value) fashion, in order to
> support these Geneve protocol feature we will
> introduce the new item "rte_flow_item_geneve_option"
> 
> The support for new item will be added to testpmd
> and include values and masks for the fields:
> - class
> - type
> - data length
> - data itself
> 
> The usage example:
> 
> "flow create 0 ingress pattern ipv4 / udp /
> geneve / geneve_opt class is 102 type is 80
> type mask ff data is 10002 data mask is
> 7fffffff / end actions drop / end "
> 

Can we have in the same flow number of such items?

> New item will be added to testpmd to support
> raw encap/decap action.
> 
> Signed-off-by: Shiri Kuzin <shirik at nvidia.com>
> ---
>  lib/librte_ethdev/rte_flow.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
> index da8bfa5..d04ee7c 100644
> --- a/lib/librte_ethdev/rte_flow.h
> +++ b/lib/librte_ethdev/rte_flow.h
> @@ -347,6 +347,13 @@ enum rte_flow_item_type {
>  	RTE_FLOW_ITEM_TYPE_GENEVE,
> 
>  	/**
> +	 * Matches a GENEVE Variable Length Option.
> +	 *
> +	 * See struct rte_flow_item_geneve_option.
> +	 */
> +	RTE_FLOW_ITEM_TYPE_GENEVE_OPTION,
> +
> +	/**
>  	 * Matches a VXLAN-GPE header.
>  	 *
>  	 * See struct rte_flow_item_vxlan_gpe.
> @@ -1097,6 +1104,24 @@ struct rte_flow_item_geneve {
>  #endif
> 
>  /**
> + * RTE_FLOW_ITEM_TYPE_GENEVE_OPTION.
> + *
> + * Matches a GENEVE Variable Length Option
> + */
> +struct rte_flow_item_geneve_option {
> +	rte_be16_t option_class;
> +	uint8_t option_type;
> +#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
> +	uint8_t length:5;
> +	uint8_t rsvd0:3;
> +#else
> +	uint8_t rsvd0:3;
> +	uint8_t length:5;
> +#endif
> +	    uint8_t data[];

I think it will be better to use pointer and not empty array.
Other option is to always take the max possible data size 32.

> +};
> +
> +/**
>   * RTE_FLOW_ITEM_TYPE_VXLAN_GPE (draft-ietf-nvo3-vxlan-gpe-05).
>   *
>   * Matches a VXLAN-GPE header.
> --
> 1.8.3.1

Best,
Ori