[v1 2/4] ethdev: support GRE optional fields

[Ori Kam]

Hi Sean,

Please add this feature to the release note.

> -----Original Message-----
> From: Sean Zhang (Networking SW) <xiazhang at nvidia.com>
> Sent: Wednesday, January 26, 2022 10:44 AM
> Subject: [v1 2/4] ethdev: support GRE optional fields
> 
> Add flow pattern items and header format for matching optional fields
> (checksum/key/sequence) in GRE header. And the flags in gre item should
> be correspondingly set with the new added items.
> 
> Signed-off-by: Sean Zhang <xiazhang at nvidia.com>
> ---
>  doc/guides/prog_guide/rte_flow.rst | 17 +++++++++++++++++
>  lib/ethdev/rte_flow.c              |  1 +
>  lib/ethdev/rte_flow.h              | 19 +++++++++++++++++++
>  3 files changed, 37 insertions(+)
> 
> diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
> index b4aa9c4..0e47501 100644
> --- a/doc/guides/prog_guide/rte_flow.rst
> +++ b/doc/guides/prog_guide/rte_flow.rst
> @@ -1106,6 +1106,7 @@ Matches a GRE header.
> 
>  Item: ``GRE_KEY``
>  ^^^^^^^^^^^^^^^^^
> +This action is deprecated. Consider `Item: GRE_OPTION`.
> 
>  Matches a GRE key field.
>  This should be preceded by item ``GRE``.
> @@ -1113,6 +1114,22 @@ This should be preceded by item ``GRE``.
>  - Value to be matched is a big-endian 32 bit integer.
>  - When this item present it implicitly match K bit in default mask as "1"
> 
> +Item: ``GRE_OPTION``
> +^^^^^^^^^^^^^^^^^^^^
> +
> +Matches a GRE optional fields (checksum/key/sequence).
> +This should be preceded by item ``GRE``.
> +
> +- ``checksum``: checksum.
> +- ``key``: key.
> +- ``sequence``: sequence.
> +- The items in GRE_OPTION do not change bit flags(c_bit/k_bit/s_bit) in GRE
> +  item. The bit flags need be set with GRE item by application. When the items
> +  present, the corresponding bits in GRE spec and mask should be set "1" by
> +  application, it means to match specified value of the fields. When the items
> +  no present, but the corresponding bits in GRE spec and mask is "1", it means
> +  to match any value of the fields.
> +
>  Item: ``FUZZY``
>  ^^^^^^^^^^^^^^^
> 
> diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c
> index a93f68a..7f93900 100644
> --- a/lib/ethdev/rte_flow.c
> +++ b/lib/ethdev/rte_flow.c
> @@ -139,6 +139,7 @@ struct rte_flow_desc_data {
>  	MK_FLOW_ITEM(META, sizeof(struct rte_flow_item_meta)),
>  	MK_FLOW_ITEM(TAG, sizeof(struct rte_flow_item_tag)),
>  	MK_FLOW_ITEM(GRE_KEY, sizeof(rte_be32_t)),
> +	MK_FLOW_ITEM(GRE_OPTION, sizeof(struct rte_flow_item_gre_opt)),
>  	MK_FLOW_ITEM(GTP_PSC, sizeof(struct rte_flow_item_gtp_psc)),
>  	MK_FLOW_ITEM(PPPOES, sizeof(struct rte_flow_item_pppoe)),
>  	MK_FLOW_ITEM(PPPOED, sizeof(struct rte_flow_item_pppoe)),
> diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
> index 1031fb2..db58b47 100644
> --- a/lib/ethdev/rte_flow.h
> +++ b/lib/ethdev/rte_flow.h
> @@ -37,6 +37,7 @@
>  #include <rte_gtp.h>
>  #include <rte_l2tpv2.h>
>  #include <rte_ppp.h>
> +#include <rte_gre.h>
> 
>  #ifdef __cplusplus
>  extern "C" {
> @@ -660,6 +661,13 @@ enum rte_flow_item_type {
>  	 * See struct rte_flow_item_ppp.
>  	 */
>  	RTE_FLOW_ITEM_TYPE_PPP,
> +
> +	/**
> +	 * Matches GRE optional fields.
> +	 *
> +	 * See struct rte_flow_item_gre_opt.
> +	 */
> +	RTE_FLOW_ITEM_TYPE_GRE_OPTION,
>  };
> 
>  /**
> @@ -1196,6 +1204,17 @@ struct rte_flow_item_gre {
>  #endif
> 
>  /**
> + * RTE_FLOW_ITEM_TYPE_GRE_OPTION.
> + *
> + * Matches GRE optional fields in header.
> + */
> +struct rte_flow_item_gre_opt {
> +	struct rte_gre_hdr_opt_checksum checksum;
> +	struct rte_gre_hdr_opt_key key;
> +	struct rte_gre_hdr_opt_sequence sequence;
> +};
> +
> +/**
>   * RTE_FLOW_ITEM_TYPE_FUZZY
>   *
>   * Fuzzy pattern match, expect faster than default.
> --
> 1.8.3.1

Best,
Ori