[PATCH 00/12 net-next,v2] add flow_rule infrastructure

Pablo Neira Ayuso
2018-11-19T10:38:13Z

Hi,

This patchset introduces a kernel intermediate representation (IR) to
express ACL hardware offloads, as already described in previous RFC and
v1 patchset [1] [2]. The idea is to normalize the frontend U/APIs to use
the flow dissectors and the flow actions so drivers can reuse the
existing TC offload driver codebase - that has been converted to use the
flow_rule infrastructure.

After this patch, as Or previously described, there is one extra layer:

kernel frontend U/API X --> kernel parser Y --> IR --> driver --> HW API
kernel frontend U/API Z --> kernel parser W --> IR --> driver --> HW API

However, cost of this layer is very small, adding 1 million rules via
tc -batch, perf shows:

0.06% tc [kernel.vmlinux] [k] tc_setup_flow_action

at position 187 in the call graph, far from the top ten. The flow_match
representation uses the flow dissector infrastructure, just like
cls_flower, therefore, there is no need for conversion of the rule match
side.

The flow_action representation is very similar to the TC action plus
this includes wake-up-on-lan and queue to CPU actions that are needed
for the ethtool_rx_flow_spec interface in the bcm_sf2 driver, that is
converted in this patchset to use it. It is now possible to add tc
cls_flower support for bcm_sf2 and reuse the existing parser that was
originally designed for the ethtool_rx_flow_spec interface.

As requested, this new patchset also converts qlogic/qede to use this
new infrastructure (see patch 12/12). This driver currently has two
parsers, one for ethtool_rx_flow_spec and another for tc cls_flower.
This driver supports for simple 5-tuple matching and available actions
are packet drop and queue. This patch updates the driver code to use one
single parser to populate HW IR.

Thanks.

[1] https://lwn.net/Articles/766695/
[2] https://marc.info/?l=linux-netdev&m=154233253114506&w=2

Pablo Neira Ayuso (12):
flow_dissector: add flow_rule and flow_match structures and use them
net/mlx5e: support for two independent packet edit actions
flow_dissector: add flow action infrastructure
cls_api: add translator to flow_action representation
cls_flower: add statistics retrieval infrastructure and use it
drivers: net: use flow action infrastructure
cls_flower: don't expose TC actions to drivers anymore
flow_dissector: add wake-up-on-lan and queue to flow_action
flow_dissector: add basic ethtool_rx_flow_spec to flow_rule structure
translator
dsa: bcm_sf2: use flow_rule infrastructure
qede: place ethtool_rx_flow_spec after code after TC flower codebase
qede: use ethtool_rx_flow_rule() to remove duplicated parser code

drivers/net/dsa/bcm_sf2_cfp.c | 108 +--
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 252 +++----
.../net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c | 450 ++++++-------
drivers/net/ethernet/intel/i40e/i40e_main.c | 178 ++---
drivers/net/ethernet/intel/iavf/iavf_main.c | 195 +++---
drivers/net/ethernet/intel/igb/igb_main.c | 64 +-
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 743 ++++++++++-----------
drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c | 2 +-
.../net/ethernet/mellanox/mlxsw/spectrum_flower.c | 259 ++++---
drivers/net/ethernet/netronome/nfp/flower/action.c | 196 +++---
drivers/net/ethernet/netronome/nfp/flower/match.c | 417 ++++++------
.../net/ethernet/netronome/nfp/flower/offload.c | 151 ++---
drivers/net/ethernet/qlogic/qede/qede_filter.c | 537 ++++++---------
include/net/flow_dissector.h | 185 +++++
include/net/pkt_cls.h | 29 +-
net/core/flow_dissector.c | 341 ++++++++++
net/sched/cls_api.c | 113 ++++
net/sched/cls_flower.c | 42 +-
18 files changed, 2279 insertions(+), 1983 deletions(-)

--
2.11.0