[RFC PATCH net-next 0/8] DSA changes for multiple CPU ports (part 1)

[Vladimir Oltean <vladimir.oltean@nxp.com>]

Some may know that I am trying to enable the second internal port pair
from the NXP LS1028A Felix switch for DSA-tagged traffic via "ocelot-8021q".

This series represents part 1 (of an unknown number) of that effort.
It does some preparation work, like managing host flooding in DSA via a
dedicated method, and removing the CPU port as argument from the tagging
protocol change procedure.

In terms of driver-specific changes, it reworks the 2 tag protocol
implementations in the Felix driver to have a structured data format.
It enables host flooding towards all tag_8021q CPU ports. It dynamically
updates the tag_8021q CPU port used for traps. It also fixes a bug
introduced by a previous refactoring/oversimplification commit in
net-next.

For those interested, I've pushed my WIP branch here:
https://github.com/vladimiroltean/linux/commits/dsa-multiple-cpu-ports
It shows the more complete picture, but I haven't tested it nearly
enough, it just shows the rough shape of where I'd like to bring things.
Feedback is welcome.

Vladimir Oltean (8):
  net: dsa: felix: program host FDB entries towards PGID_CPU for
    tag_8021q too
  net: dsa: felix: bring the NPI port indirection for host MDBs to
    surface
  net: dsa: felix: bring the NPI port indirection for host flooding to
    surface
  net: dsa: introduce the dsa_cpu_ports() helper
  net: dsa: felix: manage host flooding using a specific driver callback
  net: dsa: remove port argument from ->change_tag_protocol()
  net: dsa: felix: dynamically determine tag_8021q CPU port for traps
  net: dsa: felix: reimplement tagging protocol change with function
    pointers

 drivers/net/dsa/mv88e6xxx/chip.c    |  22 +-
 drivers/net/dsa/ocelot/felix.c      | 469 +++++++++++++++-------------
 drivers/net/dsa/ocelot/felix.h      |  16 +
 drivers/net/dsa/realtek/rtl8365mb.c |   2 +-
 drivers/net/ethernet/mscc/ocelot.c  |  16 +-
 include/net/dsa.h                   |  19 +-
 net/dsa/dsa2.c                      |  18 +-
 net/dsa/dsa_priv.h                  |   1 +
 net/dsa/port.c                      |   8 +
 net/dsa/slave.c                     |  36 +--
 net/dsa/switch.c                    |  10 +-
 11 files changed, 337 insertions(+), 280 deletions(-)

-- 
2.25.1