[PATCH iproute2-next v2 0/2] devlink: support u64-array devlink parameters

[Ratheesh Kannoth <rkannoth@marvell.com>]

The kernel gained support for devlink parameters of type
DEVLINK_VAR_ATTR_TYPE_U64_ARRAY.  These parameters carry a variable-length
list of u64 values encoded as multiple DEVLINK_ATTR_PARAM_VALUE_DATA
attributes.  This is used by drivers that need to expose ordered lists of
configuration values, such as the Marvell CN20K npc_srch_order parameter.

This series updates the devlink tool to handle the new UAPI and adds
show/set support for u64-array parameters on both device and port params.

Patch 1 switches devlink param show/set to use DEVLINK_VAR_ATTR_TYPE_*
constants instead of generic MNL_TYPE_* values when interpreting
DEVLINK_ATTR_PARAM_TYPE.  The kernel now reports param types using
devlink_var_attr_type, so userspace must use the matching symbols.

Patch 2 adds parsing, display, and configuration support for
DEVLINK_VAR_ATTR_TYPE_U64_ARRAY.  Values are shown as a space-separated
list of u64 elements.  Setting accepts a space- or comma-separated list
and emits one DEVLINK_ATTR_PARAM_VALUE_DATA attribute per element.

Tested on CN20K hardware with npc_srch_order:

  # show search order
  devlink dev param show pci/0002:01:00.0 name npc_srch_order
  pci/0002:01:00.0:
    name npc_srch_order type driver-specific
      values:
        cmode runtime value  value  0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

  # set search order
  devlink dev param set pci/0002:01:00.0 name npc_srch_order \
    value 31,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 \
    cmode runtime

Depends on the corresponding kernel UAPI addition of
DEVLINK_VAR_ATTR_TYPE_U64_ARRAY.

Ratheesh Kannoth (2):
  devlink: use DEVLINK_VAR_ATTR_TYPE_* in param show/set
  devlink: support u64-array values in devlink param show/set

 devlink/devlink.c            | 178 ++++++++++++++++++++++++++++++++---
 include/uapi/linux/devlink.h |   1 +
 2 files changed, 164 insertions(+), 15 deletions(-)

--
v1 -> v2: Addressed David comments
	https://lore.kernel.org/netdev/20260615041042.549715-1-rkannoth@marvell.com/

2.43.0