Merge branch 'nfp-flower-add-support-for-multi-zone-conntrack'

Merge branch 'nfp-flower-add-support-for-multi-zone-conntrack'

Louis Peens says:

====================
nfp: flower: add support for multi-zone conntrack

This series add changes to support offload of connection tracking across
multiple zones. Previously the driver only supported offloading of a
single goto_chain, spanning a single zone. This was implemented by
merging a pre_ct rule, post_ct rule and the nft rule. This series
provides updates to let the original post_ct rule act as the new pre_ct
rule for a next set of merges if it contains another goto and
conntrack action. In pseudo-tc rule format this adds support for:

    ingress chain 0 proto ip flower
        action ct zone 1 pipe action goto 1

    ingress chain 1 proto ip flower ct_state +tr+new ct_zone 1
        action ct_clear pipe action ct zone 2 pipe action goto 2
    ingress chain 1 proto ip flower ct_state +tr+est ct_zone 1
        action ct_clear pipe action ct zone 2 pipe action goto 2

    ingress chain 2 proto ip flower ct_state +tr+new ct_zone 2
        action mirred egress redirect dev ...
    ingress chain 2 proto ip flower ct_state +tr+est ct_zone 2
        action mirred egress redirect dev ...

This can continue for up to a maximum of 4 zone recirculations.

The first few patches are some smaller preparation patches while the
last one introduces the functionality.
====================

Link: https://lore.kernel.org/r/20230314063610.10544-1-louis.peens@corigine.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>