mlxsw: Multicast flood update

From: Jiri Pirko <[email protected]>

Nogah says:

Currently, there are four erroneous flows in MC flood:
1. When MC is disabled it affects only the flood table for unregistered MC packets, but packets that match an entry in the MDB are unaffected.
2. When MC is disabled, MC packets are being sent to all the ports in the bridge (like BC and link-local MC packets) regardless of the designated flag (BR_MCAST_FLAG).
3. When a port is being deleted from a bridge it might remain in the MDB.
4. When MC is enabled packets are flooded to the mrouter ports only if they don't match any entry in the MDB, when they should always be flooded to them.

What these problems have in common is the discrepancy between how the hardware handles MDB and mcast flood, and how the driver does it. Each of these problems needs fixing either in the MDB code, or in mcast flood code, and some in both.

Patches 1-6 change the way the MDB is handled in the driver to make the following changes easier.
Patches 7-8 fix problem number 1 by removing the MDB from the HW when MC is being disabled and restoring it when it is being enabled. Patches 9-10 fix problem number 2 by offloading the flood table by the appropriate flag.
Patch 11 fixes problem number 3 by adding MDB flush to the port removal. Patches 12-14 fix problem number 4 by adding the mrouter ports to every MDB entry in the HW to mimic the wanted behaviour.

Nogah Frankel (16):
mlxsw: spectrum_switchdev: Change mc_router to mrouter
mlxsw: spectrum_switchdev: Add a ports bitmap to the mid db
mlxsw: spectrum_switchdev: Remove reference count from mid
mlxsw: spectrum_switchdev: Save mids list per bridge device
mlxsw: spectrum_switchdev: Break smid write function
mlxsw: spectrum_switchdev: Attach mid id allocation to HW write
mlxsw: spectrum_switchdev: Break mid deletion into two function
mlxsw: spectrum_switchdev: Don't write mids to the HW when mc is
disabled
mlxsw: spectrum_switchdev: Disable mdb when mc is disabled
mlxsw: spectrum_switchdev: Use generic mc flood function
mlxsw: spectrum_switchdev: Flood mc when mc is disabled by user flag
mlxsw: spectrum_switchdev: Flush the mdb when a port is being removed
mlxsw: spectrum_switchdev: Flood all mc packets to mrouter ports
mlxsw: spectrum_switchdev: Update the mdb of mrouter port change
mlxsw: spectrum_switchdev: Remove mrouter flood in mdb flush
mlxsw: spectrum_switchdev: Consider mrouter status for mdb changes

 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |   3 +-
 .../ethernet/mellanox/mlxsw/spectrum_switchdev.c   | 417 ++++++++++++++++-----
 2 files changed, 323 insertions(+), 97 deletions(-)

2.9.5