[PATCH v12 net-next 0/9] octeontx2-af: npc: Enhancements.

[Ratheesh Kannoth]

This series extends Marvell octeontx2-af support for CN20K NPC (MCAM
debuggability, allocation policy, default-rule lifetime, optional KPU
profiles from firmware files, X2/X4 MCAM keyword handling in flows and
defaults, and dynamic CN20K NPC private state), adds a devlink mechanism
for multi-value parameters, and adjusts devlink param netlink helpers
and mlx5 so stack usage stays within -Wframe-larger-than limits once union
devlink_param_value grows.

Patch 1 improves CN20K MCAM visibility in debugfs: mcam_layout marks
enabled entries, dstats reports per-entry hit deltas, and mismatch lists
enabled entries without a PF mapping. MCAM enable state is tracked in a
bitmap updated from the CN20K enable path.

Patch 2 reduces stack usage in mlx5e_pcie_cong_get_thresh_config() by
reusing a single union devlink_param_value and a local result struct
instead of holding a large array of unions on the stack, so the helper
stays under the frame-size warning limit as the union grows (patches 3-4).

Patch 3 changes devlink_nl_param_value_put() and
devlink_nl_param_value_fill_one() to pass union devlink_param_value by
pointer instead of by value. Passing two copies of the union by value in
the param netlink path consumes over 500 bytes of argument stack and risks
CONFIG_FRAME_WARN as the union grows beyond its historical size (patch 4).

Patch 4 (Saeed) introduces DEVLINK_PARAM_TYPE_U64_ARRAY and nested
DEVLINK_ATTR_PARAM_VALUE_DATA attributes so drivers and user space can
exchange bounded u64 arrays; YAML, uapi, and netlink validation are
updated.

Patch 5 adds a runtime devlink parameter srch_order to reorder CN20K
subbank search during MCAM allocation.

Patch 6 ties default MCAM entries to NIX LF alloc/free on CN20K, adds
NIX_LF_DONT_FREE_DFT_IDXS for PF teardown paths that must not drop default
NPC indexes while the driver still owns state, and tightens nix_lf_alloc
error propagation.

Patch 7 allows loading a custom KPU profile from /lib/firmware/kpu via
module parameter kpu_profile, with cam2 / ptype_mask wiring and helpers
that share firmware-sourced vs filesystem-sourced profile layouts.

Patch 8 makes default-rule allocation, AF flow install, and PF-side RSS,
defaults, and ethtool flows respect the active CN20K MCAM keyword width
(X2 vs X4), including X4 reference-index masking and -EOPNOTSUPP when a
flow needs X4 keys on an X2-only profile.

Patch 9 replaces file-scope npc_priv and static dstats with allocation
sized from discovered bank/subbank geometry, threads npc_priv_get()
through CN20K NPC paths, and allocates dstats via devm_kzalloc for the
debugfs helper.

The mlx5 change sits immediately before the devlink patches so the series
applies cleanly and stays warning-free when built incrementally;
pass-by-pointer precedes the U64 array type so helpers are not copying an
even larger union by value. The CN20K patches keep srch_order ahead of
NIX LF coordination, KPU-from-filesystem, X2/X4 handling, and the npc_priv
refactor that touches the same files heavily.

Ratheesh Kannoth (8):
  octeontx2-af: npc: cn20k: debugfs enhancements
  net/mlx5e: trim stack use in PCIe congestion threshold helper
  devlink: pass param values by pointer
  octeontx2-af: npc: cn20k: add subbank search order control
  octeontx2: cn20k: Coordinate default rules with NIX LF lifecycle
  octeontx2-af: npc: Support for custom KPU profile from filesystem
  octeontx2: cn20k: Respect NPC MCAM X2/X4 profile in flows and DFT
    alloc
  octeontx2-af: npc: cn20k: Allocate npc_priv and dstats dynamically.

Saeed Mahameed (1):
  devlink: Implement devlink param multi attribute nested data values

 Documentation/netlink/specs/devlink.yaml          |   4 +
 drivers/dpll/zl3073x/devlink.c                    |   6 ++-
 drivers/net/ethernet/amazon/ena/ena_devlink.c     |   8 ++-
 drivers/net/ethernet/amd/pds_core/core.h          |   2 ++-
 drivers/net/ethernet/amd/pds_core/devlink.c       |   2 ++-
 drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c |   6 ++-
 drivers/net/ethernet/intel/ice/devlink/devlink.c  |  30 ++-
 .../ethernet/marvell/octeontx2/af/cn20k/debugfs.c | 175 ++++-
 .../net/ethernet/marvell/octeontx2/af/cn20k/npc.c | 545 ++++++++-----
 .../net/ethernet/marvell/octeontx2/af/cn20k/npc.h |  13 +++-
 drivers/net/ethernet/marvell/octeontx2/af/mbox.h  |   1 +
 drivers/net/ethernet/marvell/octeontx2/af/npc.h   |  17 +
 drivers/net/ethernet/marvell/octeontx2/af/rvu.h   |  12 ++-
 ...et/ethernet/marvell/octeontx2/af/rvu_devlink.c | 114 ++-
 ...rs/net/ethernet/marvell/octeontx2/af/rvu_nix.c |  69 ++-
 ...rs/net/ethernet/marvell/octeontx2/af/rvu_npc.c | 478 +++++++++--
 ...rs/net/ethernet/marvell/octeontx2/af/rvu_npc.h |  17 +
 ...net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c |  12 +++-
 ...rs/net/ethernet/marvell/octeontx2/af/rvu_reg.h |   1 +
 .../ethernet/marvell/octeontx2/nic/otx2_devlink.c |   4 ++-
 ...et/ethernet/marvell/octeontx2/nic/otx2_flows.c |  48 ++-
 ...s/net/ethernet/marvell/octeontx2/nic/otx2_pf.c |   6 +--
 drivers/net/ethernet/mellanox/mlx4/main.c         |  14 ++-
 drivers/net/ethernet/mellanox/mlx5/core/devlink.c |  72 ++-
 ...hernet/mellanox/mlx5/core/en/pcie_cong_event.c |  36 ++-
 ...ethernet/mellanox/mlx5/core/eswitch_offloads.c |   2 ++-
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c |   4 ++-
 ...net/ethernet/mellanox/mlx5/core/lib/nv_param.c |  12 ++-
 drivers/net/ethernet/mellanox/mlxsw/core.c        |   8 ++-
 ...ers/net/ethernet/netronome/nfp/devlink_param.c |   6 ++-
 drivers/net/netdevsim/dev.c                       |   4 ++-
 include/net/devlink.h                             |  12 ++-
 include/uapi/linux/devlink.h                      |   1 +
 net/devlink/netlink_gen.c                         |   2 +
 net/devlink/param.c                               | 120 ++-

 35 files changed, 1315 insertions(+), 548 deletions(-)

--

v11 -> v12: Addressed Paolo,Jiri comments.
	https://lore.kernel.org/netdev/20260409025055.1664053-1-rkannoth@xxxxxxxxxxx/
	Added one patch which was rejected by simon in net (as it was kind of enhancement rather than a bug)
	Added one more patch- which allocates two variables from heap.

v10 -> v11: Addressed Paolo comments.
	https://lore.kernel.org/netdev/20260403025533.6250-1-rkannoth@xxxxxxxxxxx/

v9 -> v10: Addressed Paolo comments
	https://lore.kernel.org/netdev/
	20260330053105.2722453-1-rkannoth@xxxxxxxxxxx/

v8 -> v9: Addressed Simon comments
	https://lore.kernel.org/netdev/
	20260325072159.1126964-1-rkannoth@xxxxxxxxxxx/

v7 -> v8: Addressed Simon comments
	https://lore.kernel.org/netdev/
	20260323035110.3908741-1-rkannoth@xxxxxxxxxxx/T/#t

v6 -> v7: Addressed Simon comments
	https://lore.kernel.org/netdev/20260320165432.98832-1-horms@xxxxxxxxxx/

v5 -> v6: Addressed Jakub,Jiri comments
	https://lore.kernel.org/netdev/
	20260317045623.250187-1-rkannoth@xxxxxxxxxxx/

v4 -> v5: Addressed Jakub comments
	https://lore.kernel.org/netdev/
	20260312022754.2029595-6-rkannoth@xxxxxxxxxxx/

v3 -> v4: Addressed Simon comments
	https://lore.kernel.org/netdev/abDeXLpMMxp7G1v3@rkannoth-OptiPlex-7090/#t

v2 -> v3: Addressed Simon comments.
	https://lore.kernel.org/netdev/
	20260304043032.3661647-1-rkannoth@xxxxxxxxxxx/

v1 -> v2: Addressed Jakub comments.
	https://lore.kernel.org/netdev/
	20260302085803.2449828-1-rkannoth@xxxxxxxxxxx/#t

2.43.0