netdev - [PATCH net-next,v3 0/4] flow_offload: update mangle action representation

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Message-Id: <20190906000403.3701-1-pablo@netfilter.org>
Date:   Fri,  6 Sep 2019 02:03:59 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        jakub.kicinski@...ronome.com, jiri@...nulli.us,
        saeedm@...lanox.com, vishal@...lsio.com, vladbu@...lanox.com
Subject: [PATCH net-next,v3 0/4] flow_offload: update mangle action representation

This patch updates the mangle action representation:

Patch 1) Undo bitwise NOT operation on the mangle mask (coming from tc
         pedit userspace).

Patch 2) mangle value &= mask from the front-end side.

Patch 3) adjust offset, length and coalesce consecutive pedit keys into
         one single action.

Patch 4) add support for payload mangling for netfilter.

After this patchset:

* Offset to payload does not need to be on the 32-bits boundaries anymore.
  This patchset adds front-end code to adjust the offset and length coming
  from the tc pedit representation, so drivers get an exact header field
  offset and length.

* This new front-end code coalesces consecutive pedit actions into one
  single action, so drivers can mangle IPv6 and ethernet address fields
  in one go, instead once for each 32-bit word.

On the driver side, diffstat -t shows that drivers code to deal with
payload mangling gets simplified:

        INSERTED,DELETED,MODIFIED,FILENAME
        46,116,0,drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c (-70 LOC)
        12,28,0,drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.h (-16 LOC)
	26,54,0,drivers/net/ethernet/mellanox/mlx5/core/en_tc.c (-27 LOC)
        89,111,0,drivers/net/ethernet/netronome/nfp/flower/action.c (-17 LOC)

While, on the front-end side the balance is the following:

        123,22,0,net/sched/cls_api.c (+101 LOC)

Changes since v2:

* Fix is_action_keys_supported() breakage in mlx5 reported by Vlad Buslov.

Pablo Neira Ayuso (4):
  net: flow_offload: flip mangle action mask
  net: flow_offload: bitwise AND on mangle action value field
  net: flow_offload: mangle action at byte level
  netfilter: nft_payload: packet mangling offload support

 .../net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c   | 163 +++++-----------
 .../net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.h   |  40 ++--
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c    |  80 +++-----
 drivers/net/ethernet/netronome/nfp/flower/action.c | 204 ++++++++++-----------
 include/net/flow_offload.h                         |   7 +-
 net/netfilter/nft_payload.c                        |  73 ++++++++
 net/sched/cls_api.c                                | 144 ++++++++++++---
 7 files changed, 378 insertions(+), 333 deletions(-)

-- 
2.11.0