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ynl: rename array-nest to indexed-array

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Some implementations, like bonding, has nest array with same attr type.
To support all kinds of entries under one nest array. As discussed[1],
let's rename array-nest to indexed-array, and assuming the value is
a nest by passing the type via sub-type.

[1] https://lore.kernel.org/netdev/20240312100105.16a59086@kernel.org/

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://lore.kernel.org/r/20240404063114.1221532-2-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Hangbin Liu 2024-04-04 14:31:12 +08:00 committed by Jakub Kicinski
parent f410cbea9f
commit aa6485d813
10 changed files with 53 additions and 28 deletions
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2
Documentation/netlink/genetlink-c.yaml
View File

@ -158,7 +158,7 @@ properties:
type: &attr-type
enum: [ unused, pad, flag, binary,
uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
string, nest, indexed-array, nest-type-value ]
doc:
description: Documentation of the attribute.
type: string

2
Documentation/netlink/genetlink-legacy.yaml
View File

@ -201,7 +201,7 @@ properties:
description: The netlink attribute type
enum: [ unused, pad, flag, binary, bitfield32,
uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
string, nest, indexed-array, nest-type-value ]
doc:
description: Documentation of the attribute.
type: string

2
Documentation/netlink/genetlink.yaml
View File

@ -124,7 +124,7 @@ properties:
type: &attr-type
enum: [ unused, pad, flag, binary,
uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
string, nest, indexed-array, nest-type-value ]
doc:
description: Documentation of the attribute.
type: string

2
Documentation/netlink/netlink-raw.yaml
View File

@ -222,7 +222,7 @@ properties:
description: The netlink attribute type
enum: [ unused, pad, flag, binary, bitfield32,
u8, u16, u32, u64, s8, s16, s32, s64,
string, nest, array-nest, nest-type-value,
string, nest, indexed-array, nest-type-value,
sub-message ]
doc:
description: Documentation of the attribute.

6
Documentation/netlink/specs/nlctrl.yaml
View File

@ -65,11 +65,13 @@ attribute-sets:
type: u32
-
name: ops
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: op-attrs
-
name: mcast-groups
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: mcast-group-attrs
-
name: policy

3
Documentation/netlink/specs/rt_link.yaml
View File

@ -1690,7 +1690,8 @@ attribute-sets:
type: binary
-
name: hw-s-info
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: hw-s-info-one
-
name: l3-stats

21
Documentation/netlink/specs/tc.yaml
View File

@ -1988,7 +1988,8 @@ attribute-sets:
nested-attributes: tc-ematch-attrs
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: police
@ -2128,7 +2129,8 @@ attribute-sets:
type: u32
-
name: tin-stats
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-cake-tin-stats-attrs
-
name: deficit
@ -2348,7 +2350,8 @@ attribute-sets:
type: string
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: key-eth-dst
@ -2849,7 +2852,8 @@ attribute-sets:
type: string
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: mask
@ -3002,7 +3006,8 @@ attribute-sets:
type: u32
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: flags
@ -3375,7 +3380,8 @@ attribute-sets:
nested-attributes: tc-police-attrs
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: tc-taprio-attrs
@ -3593,7 +3599,8 @@ attribute-sets:
nested-attributes: tc-police-attrs
-
name: act
type: array-nest
type: indexed-array
sub-type: nest
nested-attributes: tc-act-attrs
-
name: indev

12
Documentation/userspace-api/netlink/genetlink-legacy.rst
View File

@ -46,10 +46,16 @@ For reference the ``multi-attr`` array may look like this::
where ``ARRAY-ATTR`` is the array entry type.
array-nest
~~~~~~~~~~
indexed-array
~~~~~~~~~~~~~
``array-nest`` creates the following structure::
``indexed-array`` wraps the entire array in an extra attribute (hence
limiting its size to 64kB). The ``ENTRY`` nests are special and have the
index of the entry as their type instead of normal attribute type.
A ``sub-type`` is needed to describe what type in the ``ENTRY``. A ``nest``
``sub-type`` means there are nest arrays in the ``ENTRY``, with the structure
looks like::
[SOME-OTHER-ATTR]
[ARRAY-ATTR]

13
tools/net/ynl/lib/ynl.py
View File

@ -631,15 +631,18 @@ class YnlFamily(SpecFamily):
decoded = self._formatted_string(decoded, attr_spec.display_hint)
return decoded
def _decode_array_nest(self, attr, attr_spec):
def _decode_array_attr(self, attr, attr_spec):
decoded = []
offset = 0
while offset < len(attr.raw):
item = NlAttr(attr.raw, offset)
offset += item.full_len
subattrs = self._decode(NlAttrs(item.raw), attr_spec['nested-attributes'])
decoded.append({ item.type: subattrs })
if attr_spec["sub-type"] == 'nest':
subattrs = self._decode(NlAttrs(item.raw), attr_spec['nested-attributes'])
decoded.append({ item.type: subattrs })
else:
raise Exception(f'Unknown {attr_spec["sub-type"]} with name {attr_spec["name"]}')
return decoded
def _decode_nest_type_value(self, attr, attr_spec):
@ -733,8 +736,8 @@ class YnlFamily(SpecFamily):
decoded = attr.as_scalar(attr_spec['type'], attr_spec.byte_order)
if 'enum' in attr_spec:
decoded = self._decode_enum(decoded, attr_spec)
elif attr_spec["type"] == 'array-nest':
decoded = self._decode_array_nest(attr, attr_spec)
elif attr_spec["type"] == 'indexed-array':
decoded = self._decode_array_attr(attr, attr_spec)
elif attr_spec["type"] == 'bitfield32':
value, selector = struct.unpack("II", attr.raw)
if 'enum' in attr_spec:

18
tools/net/ynl/ynl-gen-c.py
View File

@ -841,8 +841,11 @@ class AttrSet(SpecAttrSet):
t = TypeBitfield32(self.family, self, elem, value)
elif elem['type'] == 'nest':
t = TypeNest(self.family, self, elem, value)
elif elem['type'] == 'array-nest':
t = TypeArrayNest(self.family, self, elem, value)
elif elem['type'] == 'indexed-array' and 'sub-type' in elem:
if elem["sub-type"] == 'nest':
t = TypeArrayNest(self.family, self, elem, value)
else:
raise Exception(f'new_attr: unsupported sub-type {elem["sub-type"]}')
elif elem['type'] == 'nest-type-value':
t = TypeNestTypeValue(self.family, self, elem, value)
else:
@ -1055,7 +1058,7 @@ class Family(SpecFamily):
if nested in self.root_sets:
raise Exception("Inheriting members to a space used as root not supported")
inherit.update(set(spec['type-value']))
elif spec['type'] == 'array-nest':
elif spec['type'] == 'indexed-array':
inherit.add('idx')
self.pure_nested_structs[nested].set_inherited(inherit)
@ -1619,9 +1622,12 @@ def _multi_parse(ri, struct, init_lines, local_vars):
multi_attrs = set()
needs_parg = False
for arg, aspec in struct.member_list():
if aspec['type'] == 'array-nest':
local_vars.append(f'const struct nlattr *attr_{aspec.c_name};')
array_nests.add(arg)
if aspec['type'] == 'indexed-array' and 'sub-type' in aspec:
if aspec["sub-type"] == 'nest':
local_vars.append(f'const struct nlattr *attr_{aspec.c_name};')
array_nests.add(arg)
else:
raise Exception(f'Not supported sub-type {aspec["sub-type"]}')
if 'multi-attr' in aspec:
multi_attrs.add(arg)
needs_parg |= 'nested-attributes' in aspec