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

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Date:   Thu, 18 Aug 2022 12:29:21 +0200
From:   Mattias Forsblad <mattias.forsblad@...il.com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mattias Forsblad <mattias.forsblad@...il.com>
Subject: [RFC net-next PATCH 0/3] net: dsa: mv88e6xxx: Add RMU support

The Marvell SOHO switches have the ability to receive and transmit                                                                                                    
Remote Management Frames (Frame2Reg) to the CPU through the                                                                                                           
switch attached network interface.                                                                                                                                    
These frames 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. Handling these                                                                                                          
operations via RMU instead of MDIO also relieves access                                                                                                               
contention on the MDIO bus.                                                                                                                                           
                                                                                                                                                                      
This request for comment series implements RMU layer 2 and                                                                                                            
layer 3 handling and also collecting RMON counters                                                                                                                    
through the RMU.                                                                                                                                                      
                                                                                                                                                                      
Next step could be to implement single read and writes but we've                                                                                                      
found that the gain to transfer this to RMU is neglible.                                                                                                              
                                                                                                                                                                      
Regards,                                                                                                                                                              
Mattias Forsblad                                                                                                                                                      

Mattias Forsblad (3):
  dsa: Add ability to handle RMU frames.
  mv88e6xxx: Implement remote management support (RMU)
  mv88e6xxx: rmon: Use RMU to collect rmon data.

 drivers/net/dsa/mv88e6xxx/Makefile  |   1 +
 drivers/net/dsa/mv88e6xxx/chip.c    |  60 +++++--
 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     | 256 ++++++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/rmu.h     |  18 ++
 include/net/dsa.h                   |   7 +
 include/uapi/linux/if_ether.h       |   1 +
 net/dsa/tag_dsa.c                   | 102 ++++++++++-
 10 files changed, 536 insertions(+), 16 deletions(-)
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.c
 create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.h

-- 
2.25.1