[PATCH v8 net-next 0/6] octeontx2-af: npc: Enhancements.
From: Ratheesh Kannoth
Date: Wed Mar 25 2026 - 03:27:20 EST
This series extends Marvell octeontx2-af support for CN20K NPC (MCAM
debuggability, allocation policy, default-rule lifetime, and optional
KPU profiles from firmware files) and adds a devlink mechanism for
multi-value parameters, with a small mlx5 follow-up to keep stack usage
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 heap-allocates the temporary devlink param value array in
mlx5e_pcie_cong_get_thresh_config() so a larger union devlink_param_value
does not overflow the stack (patch 3).
Patch 3 (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; devlink_nl_param_fill() moves large locals
to the heap as well.
Patch 4 adds a runtime devlink parameter npc_srch_order (U64 array) to
reorder CN20K subbank search during MCAM allocation.
Patch 5 ties default MCAM entries (broadcast, multicast, promisc, ucast)
to NIX LF alloc/free on CN20K, adds NIX_LF_DONT_FREE_DFT_IDXS for kernel
PF suspend-style teardown, and adjusts free-all and default-entry paths
so default rules are not freed as ordinary user rules.
Patch 6 allows loading a custom KPU profile from /lib/firmware/kpu via
module parameter kpu_profile on non-CN20K paths, with cam2/ptype support
and shared helpers for firmware-sourced vs filesystem-sourced profiles;
CN20K continues to use its existing custom KPU apply path.
The mlx5 change is placed immediately before the devlink union growth
so the series applies cleanly and stays warning-free when built
incrementally.
Ratheesh Kannoth (5):
octeontx2-af: npc: cn20k: debugfs enhancements
net/mlx5e: heap-allocate devlink param values
octeontx2-af: npc: cn20k: add subbank search order control
octeontx2-af: npc: cn20k: dynamically allocate and free default MCAM
entries
octeontx2-af: npc: Support for custom KPU profile from filesystem
Saeed Mahameed (1):
devlink: Implement devlink param multi attribute nested data values
Documentation/netlink/specs/devlink.yaml | 4 +
.../marvell/octeontx2/af/cn20k/debugfs.c | 126 ++++-
.../ethernet/marvell/octeontx2/af/cn20k/npc.c | 255 +++++++--
.../ethernet/marvell/octeontx2/af/cn20k/npc.h | 10 +
.../net/ethernet/marvell/octeontx2/af/mbox.h | 1 +
.../net/ethernet/marvell/octeontx2/af/npc.h | 17 +
.../net/ethernet/marvell/octeontx2/af/rvu.h | 6 +-
.../marvell/octeontx2/af/rvu_devlink.c | 92 +++-
.../ethernet/marvell/octeontx2/af/rvu_nix.c | 16 +-
.../ethernet/marvell/octeontx2/af/rvu_npc.c | 521 ++++++++++++++----
.../ethernet/marvell/octeontx2/af/rvu_npc.h | 17 +
.../ethernet/marvell/octeontx2/af/rvu_reg.h | 1 +
.../ethernet/marvell/octeontx2/nic/otx2_pf.c | 6 +-
.../mellanox/mlx5/core/en/pcie_cong_event.c | 11 +-
include/net/devlink.h | 8 +
include/uapi/linux/devlink.h | 1 +
net/devlink/netlink_gen.c | 2 +
net/devlink/param.c | 91 ++-
18 files changed, 979 insertions(+), 206 deletions(-)
--
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