netdev - [PATCH net-next 0/9] mlxsw: Add support for buffer drop traps

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Message-Id: <20200803161141.2523857-1-idosch@idosch.org>
Date:   Mon,  3 Aug 2020 19:11:32 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...lanox.com,
        petrm@...lanox.com, amitc@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 0/9] mlxsw: Add support for buffer drop traps

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

Petr says:

A recent patch set added the ability to mirror buffer related drops
(e.g., early drops) through a netdev. This patch set adds the ability to
trap such packets to the local CPU for analysis.

The trapping towards the CPU is configured by using tc-trap action
instead of tc-mirred as was done when the packets were mirrored through
a netdev. A future patch set will also add the ability to sample the
dropped packets using tc-sample action.

The buffer related drop traps are added to devlink, which means that the
dropped packets can be reported to user space via the kernel's
drop_monitor module.

Patch set overview:

Patch #1 adds the early_drop trap to devlink

Patch #2 adds extack to a few devlink operations to facilitate better
error reporting to user space. This is necessary - among other things -
because the action of buffer drop traps cannot be changed in mlxsw

Patch #3 performs a small refactoring in mlxsw, patch #4 fixes a bug that
this patchset would trigger.

Patches #5-#6 add the infrastructure required to support different traps
/ trap groups in mlxsw per-ASIC. This is required because buffer drop
traps are not supported by Spectrum-1

Patch #7 extends mlxsw to register the early_drop trap

Patch #8 adds the offload logic for the "trap" action at a qevent block.

Patch #9 adds a mlxsw-specific selftest.

Amit Cohen (1):
  devlink: Add early_drop trap

Ido Schimmel (5):
  devlink: Pass extack when setting trap's action and group's parameters
  mlxsw: spectrum_trap: Use 'size_t' for array sizes
  mlxsw: spectrum_trap: Allow for per-ASIC trap groups initialization
  mlxsw: spectrum_trap: Allow for per-ASIC traps initialization
  mlxsw: spectrum_trap: Add early_drop trap

Petr Machata (3):
  mlxsw: spectrum_span: On policer_id_base_ref_count, use dec_and_test
  mlxsw: spectrum_qdisc: Offload action trap for qevents
  selftests: mlxsw: RED: Test offload of trapping on RED qevents

 .../networking/devlink/devlink-trap.rst       |   4 +
 drivers/net/ethernet/mellanox/mlxsw/core.c    |  10 +-
 drivers/net/ethernet/mellanox/mlxsw/core.h    |  19 +-
 drivers/net/ethernet/mellanox/mlxsw/reg.h     |   1 +
 .../net/ethernet/mellanox/mlxsw/spectrum.c    |   3 +
 .../net/ethernet/mellanox/mlxsw/spectrum.h    |  14 +-
 .../ethernet/mellanox/mlxsw/spectrum_qdisc.c  |  75 +++++-
 .../ethernet/mellanox/mlxsw/spectrum_span.c   |   3 +-
 .../ethernet/mellanox/mlxsw/spectrum_trap.c   | 255 ++++++++++++++++--
 .../ethernet/mellanox/mlxsw/spectrum_trap.h   |  18 +-
 drivers/net/netdevsim/dev.c                   |   6 +-
 include/net/devlink.h                         |   9 +-
 net/core/devlink.c                            |   9 +-
 .../drivers/net/mlxsw/sch_red_core.sh         |  35 ++-
 .../drivers/net/mlxsw/sch_red_ets.sh          |  11 +
 15 files changed, 406 insertions(+), 66 deletions(-)

-- 
2.26.2