[PATCH v5 net 00/10] octeontx2-af: npc: cn20k: MCAM fixes

[Ratheesh Kannoth <rkannoth@marvell.com>]

This series tightens Marvell OcteonTX2 AF NPC support for CN20K silicon
around MCAM key typing, optional debugfs setup, defrag allocation rollback,
defrag entry relocation bookkeeping, logical MCAM clear and programming,
default-rule index handling with explicit teardown, and NIXLF reserved-slot
lookup when default rules are missing.

Patches 1 through 3 focus on AF error handling: propagate
npc_mcam_idx_2_key_type() failures through cn20k MCAM enable, config, copy,
and read paths; treat cn20k NPC debugfs nodes as optional so probe does not
fail when debugfs is unavailable; and fix defrag MCAM allocation rollback
so allocation errno is not overwritten during subbank index resolution.

Patch 4 fixes npc_defrag_move_vdx_to_free(): when an MCAM line is moved to
a new physical index, move entry2target_pffunc[] association to the new
slot, clear the old slot, and retarget the matching mcam_rules entry so
software state matches hardware after defrag.

Patches 5 through 7 refine cn20k MCAM programming: clear entries using the
logical MCAM index and resolved key width, fix bank/CFG sequencing in
npc_cn20k_config_mcam_entry(), and read action metadata from the correct
bank in npc_cn20k_read_mcam_entry().

Patches 8 through 10 complete default-rule lifecycle handling: initialize
default-rule index outputs eagerly, tear down reserved default MCAM rules
explicitly (coordinated with npc_mcam_free_all_entries()), and reject
USHRT_MAX sentinel indices from npc_get_nixlf_mcam_index() on cn20k.

Ratheesh Kannoth (10):
  octeontx2-af: npc: cn20k: Propagate MCAM key-type errors on cn20k
  octeontx2-af: npc: cn20k: Drop debugfs_create_file() error checks in init
  octeontx2-af: npc: cn20k: Propagate errors in defrag MCAM alloc rollback
  octeontx2-af: npc: cn20k: Fix target map and rule
  octeontx2-af: npc: cn20k: Clear MCAM entries by index and key width
  octeontx2-af: npc: cn20k: Fix bank value
  octeontx2-af: npc: cn20k: Fix MCAM actions read
  octeontx2-af: npc: cn20k: Initialize default-rule index outputs up front
  octeontx2-af: npc: cn20k: Tear down default MCAM rules explicitly on free
  octeontx2-af: npc: cn20k: Reject missing default-rule MCAM indices

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>

---
v4 -> v5:
	https://lore.kernel.org/all/20260427063213.3937451-11-rkannoth@marvell.com/

v3 -> v4:
  - Add patch fixing entry2target_pffunc[] and mcam_rules when defrag
    relocates an MCAM entry (npc_defrag_move_vdx_to_free()).
  - Drop the standalone default-entry x4 preference and x2-profile flow-
    install rejection patches from this series (10 patches total).
  Link:
  https://lore.kernel.org/netdev/
  20260420023442.3295891-1-rkannoth@marvell.com/

v2 -> v3:
  Addresses Simon and Paolo comments.
  Link:
  https://lore.kernel.org/netdev/
  20260420023442.3295891-1-rkannoth@marvell.com/

v1 -> v2:
  Address Simon comments and add further cn20k NPC correctness fixes.
  Link:
  https://lore.kernel.org/netdev/
  20260418162013.GG280379@horms.kernel.org/

2.43.0