Re: [PATCH v4] ethdev: deprecate header fields and metadata flow actions

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 11/26/2021 9:51 AM, Viacheslav Ovsiienko wrote:
> The generic RTE_FLOW_ACTION_TYPE_MODIFY_FIELD action was
> introduced by [1]. This action provides an unified way
> to perform various arithmetic and transfer operations over
> packet network header fields and packet metadata.
> 
> [1] commit 641dbe4fb053 ("net/mlx5: support modify field flow action")
> 
> On other side there are a bunch of multiple legacy actions,
> that can be superseded by the generic MODIFY_FIELD action:
> 
> RTE_FLOW_ACTION_TYPE_OF_SET_MPLS_TTL
> RTE_FLOW_ACTION_TYPE_OF_DEC_MPLS_TTL
> RTE_FLOW_ACTION_TYPE_OF_SET_NW_TTL
> RTE_FLOW_ACTION_TYPE_OF_DEC_NW_TTL      sfc
> RTE_FLOW_ACTION_TYPE_OF_COPY_TTL_OUT
> RTE_FLOW_ACTION_TYPE_OF_COPY_TTL_IN
> RTE_FLOW_ACTION_TYPE_SET_IPV4_SRC       bnxt, cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_IPV4_DST       bnxt, cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_IPV6_SRC       cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_IPV6_DST       cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_TP_SRC         cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_TP_DST         cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_DEC_TTL            mlx5, sfc
> RTE_FLOW_ACTION_TYPE_SET_TTL            mlx5
> RTE_FLOW_ACTION_TYPE_SET_MAC_SRC        cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_SET_MAC_DST        cxgbe, mlx5
> RTE_FLOW_ACTION_TYPE_INC_TCP_SEQ        mlx5
> RTE_FLOW_ACTION_TYPE_DEC_TCP_SEQ        mlx5
> RTE_FLOW_ACTION_TYPE_INC_TCP_ACK        mlx5
> RTE_FLOW_ACTION_TYPE_DEC_TCP_ACK        mlx5
> RTE_FLOW_ACTION_TYPE_SET_IPV4_DSCP      mlx5
> RTE_FLOW_ACTION_TYPE_SET_IPV6_DSCP      mlx5
> RTE_FLOW_ACTION_TYPE_OF_SET_VLAN_VID    bnxt, cnxk, cxgbe, enic,
>                                          mlx5, octeontx2, sfc
> RTE_FLOW_ACTION_TYPE_OF_SET_VLAN_PCP    bnxt, cnxk, cxgbe, enic,
>                                          mlx5, octeontx2, sfc
> RTE_FLOW_ACTION_TYPE_SET_TAG            mlx5
> RTE_FLOW_ACTION_TYPE_SET_META           mlx5
> 
> This note deprecates the following RTE Flow actions,
> as not supported by any of PMDs:
> 
> RTE_FLOW_ACTION_TYPE_OF_SET_MPLS_TTL
> RTE_FLOW_ACTION_TYPE_OF_DEC_MPLS_TTL
> RTE_FLOW_ACTION_TYPE_OF_SET_NW_TTL
> RTE_FLOW_ACTION_TYPE_OF_COPY_TTL_OUT
> RTE_FLOW_ACTION_TYPE_OF_COPY_TTL_IN
> 
> The following actions are supposed to be deprecated in 22.07
> and replaced by generic field modify action:
> 
> RTE_FLOW_ACTION_TYPE_OF_DEC_NW_TTL
> RTE_FLOW_ACTION_TYPE_SET_IPV4_SRC
> RTE_FLOW_ACTION_TYPE_SET_IPV4_DST
> RTE_FLOW_ACTION_TYPE_SET_IPV6_SRC
> RTE_FLOW_ACTION_TYPE_SET_IPV6_DST
> RTE_FLOW_ACTION_TYPE_SET_TP_SRC
> RTE_FLOW_ACTION_TYPE_SET_TP_DST
> RTE_FLOW_ACTION_TYPE_DEC_TTL
> RTE_FLOW_ACTION_TYPE_SET_TTL
> RTE_FLOW_ACTION_TYPE_SET_MAC_SRC
> RTE_FLOW_ACTION_TYPE_SET_MAC_DST
> RTE_FLOW_ACTION_TYPE_INC_TCP_SEQ
> RTE_FLOW_ACTION_TYPE_DEC_TCP_SEQ
> RTE_FLOW_ACTION_TYPE_INC_TCP_ACK
> RTE_FLOW_ACTION_TYPE_DEC_TCP_ACK
> RTE_FLOW_ACTION_TYPE_SET_IPV4_DSCP
> RTE_FLOW_ACTION_TYPE_SET_IPV6_DSCP
> RTE_FLOW_ACTION_TYPE_SET_TAG
> RTE_FLOW_ACTION_TYPE_SET_META
> 
> The VLAN set actions are interrelated to VLAN header insertion/removal
> and supported by multiple PMDs and widely used by applications and
> not supposed to be deprecated due to potential large impact on
> drivers and applications.
> 
> Signed-off-by: Viacheslav Ovsiienko<viacheslavo@nvidia.com>

Thanks for the update,
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>


We need to follow with relevant PMD maintainers to switch to new
'MODIFY_FIELD' action till end of v22.07 release.