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Date: Wed, 18 Oct 2023 09:39:17 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
dcaratti@...hat.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 3/3] tools: ynl-gen: support limit names
Support the use of symbolic names like s8-min or u32-max in checks
to make writing specs less painful.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
Documentation/netlink/genetlink-c.yaml | 9 ++++-
Documentation/netlink/genetlink-legacy.yaml | 9 ++++-
Documentation/netlink/genetlink.yaml | 9 ++++-
tools/net/ynl/ynl-gen-c.py | 45 ++++++++++++++++-----
4 files changed, 55 insertions(+), 17 deletions(-)
diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index 75af0b51f3d7..dee11c514896 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -13,6 +13,11 @@ $schema: https://json-schema.org/draft-07/schema
type: [ string, integer ]
pattern: ^[0-9A-Za-z_]+( - 1)?$
minimum: 0
+ len-or-limit:
+ # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
+ type: [ string, integer ]
+ pattern: ^[su](8|16|32|64)-(min|max)$
+ minimum: 0
# Schema for specs
title: Protocol
@@ -183,10 +188,10 @@ additionalProperties: False
type: string
min:
description: Min value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
max:
description: Max value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
min-len:
description: Min length for a binary attribute.
$ref: '#/$defs/len-or-define'
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index c0f17a8bfe0d..9194f3e223ef 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -13,6 +13,11 @@ $schema: https://json-schema.org/draft-07/schema
type: [ string, integer ]
pattern: ^[0-9A-Za-z_]+( - 1)?$
minimum: 0
+ len-or-limit:
+ # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
+ type: [ string, integer ]
+ pattern: ^[su](8|16|32|64)-(min|max)$
+ minimum: 0
# Schema for specs
title: Protocol
@@ -226,10 +231,10 @@ additionalProperties: False
type: string
min:
description: Min value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
max:
description: Max value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
min-len:
description: Min length for a binary attribute.
$ref: '#/$defs/len-or-define'
diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml
index 4fd56e3b1553..0a4ae861d011 100644
--- a/Documentation/netlink/genetlink.yaml
+++ b/Documentation/netlink/genetlink.yaml
@@ -13,6 +13,11 @@ $schema: https://json-schema.org/draft-07/schema
type: [ string, integer ]
pattern: ^[0-9A-Za-z_]+( - 1)?$
minimum: 0
+ len-or-limit:
+ # literal int or limit based on fixed-width type e.g. u8-min, u16-max, etc.
+ type: [ string, integer ]
+ pattern: ^[su](8|16|32|64)-(min|max)$
+ minimum: 0
# Schema for specs
title: Protocol
@@ -156,10 +161,10 @@ additionalProperties: False
type: string
min:
description: Min value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
max:
description: Max value for an integer attribute.
- type: integer
+ $ref: '#/$defs/len-or-limit'
min-len:
description: Min length for a binary attribute.
$ref: '#/$defs/len-or-define'
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 9d008346dd50..552ba49a444c 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -20,6 +20,21 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
return name.lower().replace('-', '_')
+def limit_to_number(name):
+ """
+ Turn a string limit like u32-max or s64-min into its numerical value
+ """
+ if name[0] == 'u' and name.endswith('-min'):
+ return 0
+ width = int(name[1:-4])
+ if name[0] == 's':
+ width -= 1
+ value = (1 << width) - 1
+ if name[0] == 's' and name.endswith('-min'):
+ value = -value - 1
+ return value
+
+
class BaseNlLib:
def get_family_id(self):
return 'ys->family_id'
@@ -68,6 +83,14 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
self.enum_name = None
delattr(self, "enum_name")
+ def get_limit(self, limit, default=None):
+ value = self.checks.get(limit, default)
+ if value is None:
+ return value
+ if not isinstance(value, int):
+ value = limit_to_number(value)
+ return value
+
def resolve(self):
if 'name-prefix' in self.attr:
enum_name = f"{self.attr['name-prefix']}{self.name}"
@@ -273,12 +296,12 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
self.checks['max'] = high
if 'min' in self.checks and 'max' in self.checks:
- if self.checks['min'] > self.checks['max']:
- raise Exception(f'Invalid limit for "{self.name}" min: {self.checks["min"]} max: {self.checks["max"]}')
+ if self.get_limit('min') > self.get_limit('max'):
+ raise Exception(f'Invalid limit for "{self.name}" min: {self.get_limit("min")} max: {self.get_limit("max")}')
self.checks['range'] = True
- low = min(self.checks.get('min', 0), self.checks.get('max', 0))
- high = max(self.checks.get('min', 0), self.checks.get('max', 0))
+ low = min(self.get_limit('min', 0), self.get_limit('max', 0))
+ high = max(self.get_limit('min', 0), self.get_limit('max', 0))
if low < 0 and self.type[0] == 'u':
raise Exception(f'Invalid limit for "{self.name}" negative limit for unsigned type')
if low < -32768 or high > 32767:
@@ -326,11 +349,11 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
elif 'full-range' in self.checks:
return f"NLA_POLICY_FULL_RANGE({policy}, &{c_lower(self.enum_name)}_range)"
elif 'range' in self.checks:
- return f"NLA_POLICY_RANGE({policy}, {self.checks['min']}, {self.checks['max']})"
+ return f"NLA_POLICY_RANGE({policy}, {self.get_limit('min')}, {self.get_limit('max')})"
elif 'min' in self.checks:
- return f"NLA_POLICY_MIN({policy}, {self.checks['min']})"
+ return f"NLA_POLICY_MIN({policy}, {self.get_limit('min')})"
elif 'max' in self.checks:
- return f"NLA_POLICY_MAX({policy}, {self.checks['max']})"
+ return f"NLA_POLICY_MAX({policy}, {self.get_limit('max')})"
return super()._attr_policy(policy)
def _attr_typol(self):
@@ -382,7 +405,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
def _attr_policy(self, policy):
mem = '{ .type = ' + policy
if 'max-len' in self.checks:
- mem += ', .len = ' + str(self.checks['max-len'])
+ mem += ', .len = ' + str(self.get_limit('max-len'))
mem += ', }'
return mem
@@ -431,7 +454,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
def _attr_policy(self, policy):
mem = '{ '
if len(self.checks) == 1 and 'min-len' in self.checks:
- mem += '.len = ' + str(self.checks['min-len'])
+ mem += '.len = ' + str(self.get_limit('min-len'))
elif len(self.checks) == 0:
mem += '.type = NLA_BINARY'
else:
@@ -1982,9 +2005,9 @@ _C_KW = {
cw.block_start(line=f'struct netlink_range_validation{sign} {c_lower(attr.enum_name)}_range =')
members = []
if 'min' in attr.checks:
- members.append(('min', attr.checks['min']))
+ members.append(('min', attr.get_limit('min')))
if 'max' in attr.checks:
- members.append(('max', attr.checks['max']))
+ members.append(('max', attr.get_limit('max')))
cw.write_struct_init(members)
cw.block_end(line=';')
cw.nl()
--
2.41.0
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