Re: [dpdk-dev] [PATCH 02/10] ethdev: reuse header definition in flow pattern item VLAN

[Ori Kam <orika@nvidia.com>]

Hi Ivan,

> -----Original Message-----
> From: Ivan Malov <ivan.malov@oktetlabs.ru>
> Sent: Friday, March 12, 2021 11:32 AM
> 
> One ought to reuse existing header structs in flow items.
> This particular item contains non-header fields, so it's
> important to keep the header fields in a separate struct.
> 
> Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
> Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
> Reviewed-by: Andy Moreton <amoreton@xilinx.com>
> ---
>  lib/librte_ethdev/rte_flow.h | 22 ++++++++++++++++------
>  1 file changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
> index 96fd93ee1..b9b349669 100644
> --- a/lib/librte_ethdev/rte_flow.h
> +++ b/lib/librte_ethdev/rte_flow.h
> @@ -778,13 +778,23 @@ static const struct rte_flow_item_eth
> rte_flow_item_eth_mask = {
>   * If a @p VLAN item is present in the pattern, then only tagged packets will
>   * match the pattern.
>   * The field @p has_more_vlan can be used to match any type of tagged
> packets,
> - * instead of using the @p inner_type field.
> - * If the @p inner_type and @p has_more_vlan fields are not specified,
> + * instead of using the @p eth_proto field of @p hdr.
> + * If the @p eth_proto of @p hdr and @p has_more_vlan fields are not
> specified,
>   * then any tagged packets will match the pattern.
>   */
> +RTE_STD_C11
>  struct rte_flow_item_vlan {
> -	rte_be16_t tci; /**< Tag control information. */
> -	rte_be16_t inner_type; /**< Inner EtherType or TPID. */
> +	union {
> +		struct {
> +			/*
> +			 * These fields are retained for compatibility.
> +			 * Please switch to the new header field below.
> +			 */
> +			rte_be16_t tci; /**< Tag control information. */
> +			rte_be16_t inner_type; /**< Inner EtherType or TPID.
> */
> +		};
> +		struct rte_vlan_hdr hdr;
> +	};
>  	uint32_t has_more_vlan:1;
>  	/**< Packet header contains at least one more VLAN, after this VLAN.
> */
>  	uint32_t reserved:31; /**< Reserved, must be zero. */
> @@ -793,8 +803,8 @@ struct rte_flow_item_vlan {
>  /** Default mask for RTE_FLOW_ITEM_TYPE_VLAN. */
>  #ifndef __cplusplus
>  static const struct rte_flow_item_vlan rte_flow_item_vlan_mask = {
> -	.tci = RTE_BE16(0x0fff),
> -	.inner_type = RTE_BE16(0x0000),
> +	.hdr.vlan_tci = RTE_BE16(0x0fff),
> +	.hdr.eth_proto = RTE_BE16(0x0000),
>  };
>  #endif
> 
> --
> 2.20.1

Acked-by: Ori Kam <orika@nvidia.com>
Best,
Ori