[PATCH net-next v2 0/3] net: dsa: mv88e6xxx: Add RMU support

[Mattias Forsblad <mattias.forsblad@gmail.com>]

The Marvell SOHO switches have the ability to receive and transmit
Remote Management Frames (Frame2Reg) to the CPU through the
attached network interface.
This is handled by the Remote Management Unit (RMU).
These frames can contain different payloads:
single switch register read and writes, daisy chained switch
register read and writes, RMON/MIB dump/dump clear and ATU dump.
The dump functions are very costly over MDIO but it's
only a couple of network packets via the RMU.

Next step could be to implement ATU dump.
We've found that the gain to use RMU for single register
read and writes is neglible.

RFC -> v1:
  - Track master interface availability.
  - Validate destination MAC for incoming frames.
  - Rate limit outputs.
  - Cleanup setup function validating upstream port on switch.
  - Fix return values when setting up RMU.
  - Prefix defines correctly.
  - Fix aligned accesses.
  - Validate that switch exists for incoming frames.
  - Split RMON stats function.

v1 -> v2:
  - Remove unused variable.

Regards,
Mattias Forsblad

Mattias Forsblad (3):
  dsa: Implement RMU layer in DSA
  dsa: mv88e6xxx: Add support for RMU in select switches
  rmon: Use RMU if available

 drivers/net/dsa/mv88e6xxx/Makefile  |   1 +
 drivers/net/dsa/mv88e6xxx/chip.c    |  54 +++++-
 drivers/net/dsa/mv88e6xxx/chip.h    |  20 ++
 drivers/net/dsa/mv88e6xxx/global1.c |  84 +++++++++
 drivers/net/dsa/mv88e6xxx/global1.h |   3 +
 drivers/net/dsa/mv88e6xxx/rmu.c     | 273 ++++++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/rmu.h     |  33 ++++
 include/net/dsa.h                   |   7 +
 include/uapi/linux/if_ether.h       |   1 +
 net/dsa/tag_dsa.c                   | 109 ++++++++++-
 10 files changed, 575 insertions(+), 10 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.c
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.h

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2.25.1