[net-next,v12,0/6] net: dsa: qca8k, mv88e6xxx: rmon: Add RMU support

Message

Mattias Forsblad Sept. 15, 2022, 2:36 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) in the switch
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.
    
v3 -> v4:
  - Separated patches more granular.

v4 -> v5:
  - Some small fixes after feedback.

v5 -> v6:
  - Rewrite of send_wait function to more adhere
    to RPC standards
  - Cleanup of ops handling
  - Move get id to when master device is available.

v6 -> v7:
  - Some minor cleanups.

v7 -> v8:
  - Moved defines to header file.
  - Check RMU response length and return actual
    length received.
  - Added disable/enable helpers for RMU.
  - Fixed some error paths.

v8 -> v9:
  - Naming consistency for parameters/functions.
  - Streamlined completion routines.
  - Moved completion init earlier.
  - Spelling corrected.
  - Moved dsa_tagger_data declaration.
  - Minimal frame2reg decoding in tag_dsa.
  - Fixed return codes.
  - Use convenience functions.
  - Streamlined function parameters.
  - Fixed error path when master device changes
    state.
  - Still verify MAC address (per request of Andrew Lunn)
  - Use skb_get instead of skb_copy
  - Prefix defines and structs correctly.
  - Change types to __beXX.

v9 -> v10:
  - Patchworks feedback fixed.

v10 -> v11:
  - Fixed sparse warnings.

v11 -> v12:
  - Split mv88e6xxx_stats_get_stats into separate
    functions, one for RMU and one for legacy
    access.
    
Regards,
Mattias Forsblad

Mattias Forsblad (6):
  net: dsa: mv88e6xxx: Add RMU enable for select switches.
  net: dsa: Add convenience functions for frame handling
  net: dsa: Introduce dsa tagger data operation.
  net: dsa: mv88e6xxxx: Add RMU functionality.
  net: dsa: mv88e6xxx: rmon: Use RMU for reading RMON data
  net: dsa: qca8k: Use new convenience functions

 drivers/net/dsa/mv88e6xxx/Makefile  |   1 +
 drivers/net/dsa/mv88e6xxx/chip.c    | 214 ++++++++++++-------
 drivers/net/dsa/mv88e6xxx/chip.h    |  25 +++
 drivers/net/dsa/mv88e6xxx/global1.c |  64 ++++++
 drivers/net/dsa/mv88e6xxx/global1.h |   3 +
 drivers/net/dsa/mv88e6xxx/rmu.c     | 311 ++++++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/rmu.h     |  73 +++++++
 drivers/net/dsa/mv88e6xxx/smi.c     |   3 +
 drivers/net/dsa/qca/qca8k-8xxx.c    |  61 ++----
 include/linux/dsa/mv88e6xxx.h       |   6 +
 include/net/dsa.h                   |  11 +
 net/dsa/dsa.c                       |  17 ++
 net/dsa/dsa2.c                      |   2 +
 net/dsa/dsa_priv.h                  |   2 +
 net/dsa/tag_dsa.c                   |  40 +++-
 15 files changed, 712 insertions(+), 121 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.c
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.h