[net-next,v3,0/2] net: dsa: mv88e6xxx: qca8k: Add RMU support

Message

Mattias Forsblad Sept. 5, 2022, 1:19 p.m. UTC

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.

qca8k
=====
There's a newly introduced convenience function for sending
and waiting for frames. Changes have been made for the qca8k
driver to use this. Please test for regressions.

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.

v2 -> v3:
  - Rewrite after feedback. Use tagger_data to handle
    frames more like qca8k.
  - qca8k: Change to use convenience functions introduced.
    Requesting test of this.
  
Regards,
Mattias Forsblad

Mattias Forsblad (2):
  net: dsa: mv88e6xxx: Add functionality for handling RMU frames.
  net: qca8k: Use convenience function for sending frames.

 drivers/net/dsa/mv88e6xxx/Makefile  |   1 +
 drivers/net/dsa/mv88e6xxx/chip.c    |  73 +++++--
 drivers/net/dsa/mv88e6xxx/chip.h    |  21 ++
 drivers/net/dsa/mv88e6xxx/global1.c |  76 +++++++
 drivers/net/dsa/mv88e6xxx/global1.h |   3 +
 drivers/net/dsa/mv88e6xxx/rmu.c     | 310 ++++++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/rmu.h     |  28 +++
 drivers/net/dsa/qca/qca8k-8xxx.c    |  61 ++----
 include/net/dsa.h                   |  20 +-
 net/dsa/dsa.c                       |  28 +++
 net/dsa/dsa2.c                      |   2 +
 net/dsa/tag_dsa.c                   |  32 ++-
 12 files changed, 592 insertions(+), 63 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.c
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.h