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

[Olivier Matz <olivier.matz@6wind.com>]

On Fri, Nov 26, 2021 at 02:06:23PM +0100, Thomas Monjalon wrote:
> 26/11/2021 13:53, Ferruh Yigit:
> > 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 that can be superseded by the generic MODIFY_FIELD action: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.
> 
> Yes I would like to see them replying here, but seems some are not watching.
> I don't want to block this interesting deprecation plan,
> so I will merge if few more maintainers involved in ethdev give their ack.
> 
> Acked-by: Thomas Monjalon <thomas@monjalon.net>

Acked-by: Olivier Matz <olivier.matz@6wind.com>