Add support for resource abstraction

From: Jiri Pirko <[email protected]>

Arkadi says:

Many of the ASIC's internal resources are limited and are shared between several hardware procedures. For example, unified hash-based memory can be used for many lookup purposes, like FDB and LPM. In many cases the user can provide a partitioning scheme for such a resource in order to perform fine tuning for his application. In such cases performing driver reload is needed for the changes to take place, thus this patchset also adds support for hot reload.

Such an abstraction can be coupled with devlink's dpipe interface, which models the ASIC's pipeline as a graph of match/action tables. By modeling the hardware resource object, and by coupling it to several dpipe tables, further visibility can be achieved in order to debug ASIC-wide issues.

The proposed interface will provide the user the ability to understand the limitations of the hardware, and receive notification regarding its occupancy. Furthermore, monitoring the resource occupancy can be done in real-time and can be useful in many cases.

---
v2->v3
- Mix/Max/Gran attributes.
- Add resource consumption per table.
- Change basic resource unit to 'entry'.
- ABI documentation.

v1->v2
- Add resource size attribute.
- Fix split bug.

---
Userspace part prototype can be found at https://github.com/arkadis/iproute2/
at resource_dev branch.

Arkadi Sharshevsky (11):
devlink: Add per devlink instance lock
devlink: Add support for resource abstraction
devlink: Add support for reload
devlink: Add relation between dpipe and resource
mlxsw: pci: Add support for performing bus reset
mlxsw: spectrum: Register KVD resources with devlink
mlxsw: spectrum_dpipe: Connect dpipe tables to resources
mlxsw: spectrum: Add support for getting kvdl occupancy
mlxsw: pci: Add support for getting resource through devlink
mlxsw: core: Add support for reload
mlxsw: documentation: Add resources ABI documentation

 Documentation/ABI/testing/devlink-resource-mlxsw   |  33 ++
 drivers/net/ethernet/mellanox/mlxsw/core.c         |  92 +++-
 drivers/net/ethernet/mellanox/mlxsw/core.h         |  16 +-
 drivers/net/ethernet/mellanox/mlxsw/i2c.c          |   5 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c          |  98 ++--
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c     | 249 +++++++++
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |  13 +
 .../net/ethernet/mellanox/mlxsw/spectrum_dpipe.c   |  81 ++-
 .../net/ethernet/mellanox/mlxsw/spectrum_kvdl.c    |  26 +
 include/net/devlink.h                              | 115 ++++
 include/uapi/linux/devlink.h                       |  25 +
 net/core/devlink.c                                 | 594 +++++++++++++++++++--
 12 files changed, 1213 insertions(+), 134 deletions(-)
 create mode 100644 Documentation/ABI/testing/devlink-resource-mlxsw

2.14.3