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 across four
devl_param_driverinit_value_get() calls (instead of
union devlink_param_value val[4] on the stack) and assigning each vu16
into mlx5e_pcie_cong_thresh,
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: Reduce stack use reading PCIe congestion thresholds
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 | 16 +-
.../net/ethernet/marvell/octeontx2/af/cn20k/npc.c | 542 ++++++++++++---------
.../net/ethernet/marvell/octeontx2/af/cn20k/npc.h | 6 +-
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 +-
.../ethernet/marvell/octeontx2/af/rvu_devlink.c | 114 ++++-
.../net/ethernet/marvell/octeontx2/af/rvu_nix.c | 69 ++-
.../net/ethernet/marvell/octeontx2/af/rvu_npc.c | 486 ++++++++++++++----
.../net/ethernet/marvell/octeontx2/af/rvu_npc.h | 17 +
.../net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c | 12 +-
.../net/ethernet/marvell/octeontx2/af/rvu_reg.h | 1 +
.../ethernet/marvell/octeontx2/nic/otx2_devlink.c | 4 +-
.../ethernet/marvell/octeontx2/nic/otx2_flows.c | 48 +-
.../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 +--
.../mellanox/mlx5/core/en/pcie_cong_event.c | 45 +-
.../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 +-
drivers/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, 1175 insertions(+), 536 deletions(-)
--
v15 -> v16: Addressed Sashiko comments
https://lore.kernel.org/netdev/20260520020939.1457231-1-rkannoth@marvell.com/
v14 -> v15: Addressed Paolo comments
https://lore.kernel.org/netdev/20260514062537.3813802-1-rkannoth@marvell.com/
v13 -> v14: Addressed sashiko comments.
I had to revert Jiri comment in v11 as sashiko was complaining about
leaking kernel memory to userspace.
https://lore.kernel.org/netdev/20260511033923.1301976-1-rkannoth@marvell.com/
v12 -> v13: Addressed David Laight comments
https://lore.kernel.org/netdev/20260508034912.4082520-1-rkannoth@marvell.com/
v11 -> v12: Addressed Paolo,Jiri comments.
https://lore.kernel.org/netdev/20260409025055.1664053-1-rkannoth@marvell.com/
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@marvell.com/
v9 -> v10: Addressed Paolo comments
https://lore.kernel.org/netdev/
20260330053105.2722453-1-rkannoth@marvell.com/
v8 -> v9: Addressed Simon comments
https://lore.kernel.org/netdev/
20260325072159.1126964-1-rkannoth@marvell.com/
v7 -> v8: Addressed Simon comments
https://lore.kernel.org/netdev/
20260323035110.3908741-1-rkannoth@marvell.com/T/#t
v6 -> v7: Addressed Simon comments
https://lore.kernel.org/netdev/20260320165432.98832-1-horms@kernel.org/
v5 -> v6: Addressed Jakub,Jiri comments
https://lore.kernel.org/netdev/
20260317045623.250187-1-rkannoth@marvell.com/
v4 -> v5: Addressed Jakub comments
https://lore.kernel.org/netdev/
20260312022754.2029595-6-rkannoth@marvell.com/
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@marvell.com/
v1 -> v2: Addressed Jakub comments.
https://lore.kernel.org/netdev/
20260302085803.2449828-1-rkannoth@marvell.com/#t
2.43.0