netdev - [PATCH net-next 0/5] mlxsw: Add support for RED qevent "mark"

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Date:   Sun, 17 Jan 2021 10:02:18 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, petrm@...dia.com,
        jiri@...dia.com, amcohen@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 0/5] mlxsw: Add support for RED qevent "mark"

From: Ido Schimmel <idosch@...dia.com>

Petr says:

The RED qdisc currently supports two qevents: "early_drop" and "mark". The
filters added to the block bound to the "early_drop" qevent are executed on
packets for which the RED algorithm decides that they should be
early-dropped. The "mark" filters are similarly executed on ECT packets
that are marked as ECN-CE (Congestion Encountered).

A previous patchset has offloaded "early_drop" filters on Spectrum-2 and
later, provided that the classifier used is "matchall", that the action
used is either "trap" or "mirred", and a handful or further limitations.

This patchset similarly offloads "mark" filters.

Patch set overview:

Patches #1 and #2 add the trap, under which packets will be reported to the
CPU, if the qevent filter uses the action "trap".

Patch #3 then recognizes FLOW_BLOCK_BINDER_TYPE_RED_MARK as a binder type,
and offloads the attached filters similarly to _EARLY_DROP.

Patch #4 cleans up some unused variables in a selftest, and patch #5 adds a
new selftest for the RED "mark" qevent offload.

Petr Machata (5):
  devlink: Add ecn_mark trap
  mlxsw: spectrum_trap: Add ecn_mark trap
  mlxsw: spectrum_qdisc: Offload RED qevent mark
  selftests: mlxsw: sch_red_core: Drop two unused variables
  selftests: mlxsw: RED: Add selftests for the mark qevent

 .../networking/devlink/devlink-trap.rst       |  4 +
 .../net/ethernet/mellanox/mlxsw/spectrum.c    |  2 +
 .../net/ethernet/mellanox/mlxsw/spectrum.h    |  2 +
 .../ethernet/mellanox/mlxsw/spectrum_qdisc.c  | 14 +++-
 .../ethernet/mellanox/mlxsw/spectrum_span.c   | 16 ++++
 .../ethernet/mellanox/mlxsw/spectrum_span.h   |  1 +
 .../ethernet/mellanox/mlxsw/spectrum_trap.c   |  9 ++
 include/net/devlink.h                         |  3 +
 net/core/devlink.c                            |  1 +
 .../drivers/net/mlxsw/sch_red_core.sh         | 84 ++++++++++++++++++-
 .../drivers/net/mlxsw/sch_red_ets.sh          | 74 ++++++++++++++--
 11 files changed, 200 insertions(+), 10 deletions(-)

-- 
2.29.2