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

Jose Abreu
2018-11-19T19:43:59Z

Hello Pablo,

On 19-11-2018 00:15, Pablo Neira Ayuso wrote:
> 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://urldefense.proofpoint.com/v2/url?u=https-3A__lwn.net_Articles_766695_&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=yaVFU4TjGY0gVF8El1uKcisy6TPsyCl9uN7Wsis-qhY&m=tB4p4lWxJv3Np8Tg05scy415_MEU7RQO3Q6KGdcTMCg&s=EUCsiqp58Et5K2u9hHsxXyF6ep1yfhnASEBdXur33oQ&e=
> [2] https://urldefense.proofpoint.com/v2/url?u=https-3A__marc.info_-3Fl-3Dlinux-2Dnetdev-26m-3D154233253114506-26w-3D2&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=yaVFU4TjGY0gVF8El1uKcisy6TPsyCl9uN7Wsis-qhY&m=tB4p4lWxJv3Np8Tg05scy415_MEU7RQO3Q6KGdcTMCg&s=1XOZeTYyELUCyM8yS76_bRQOVGOy19pnV9cH937FjkY&e=
>
> 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(-)
>

Although I was cc'ed in the thread I'm not seeing stmmac driver
in this conversion. Can you please add it ?

Thanks and Best Regards,
Jose Miguel Abreu