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Date: Wed, 18 Oct 2023 14:39:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 3/3] netlink: specs: add support for auto-sized scalars
Support uint / sint types in specs and YNL.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
Documentation/netlink/genetlink-c.yaml | 3 ++-
Documentation/netlink/genetlink-legacy.yaml | 3 ++-
Documentation/netlink/genetlink.yaml | 3 ++-
tools/net/ynl/lib/nlspec.py | 6 ++++++
tools/net/ynl/lib/ynl.c | 6 ++++++
tools/net/ynl/lib/ynl.h | 17 +++++++++++++++++
tools/net/ynl/lib/ynl.py | 14 ++++++++++++++
tools/net/ynl/ynl-gen-c.py | 6 ++++--
8 files changed, 53 insertions(+), 5 deletions(-)
diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index dee11c514896..c72c8a428911 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -149,7 +149,8 @@ additionalProperties: False
name:
type: string
type: &attr-type
- enum: [ unused, pad, flag, binary, u8, u16, u32, u64, s32, s64,
+ enum: [ unused, pad, flag, binary,
+ uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
doc:
description: Documentation of the attribute.
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 9194f3e223ef..923de0ff1a9e 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -192,7 +192,8 @@ additionalProperties: False
type: string
type: &attr-type
description: The netlink attribute type
- enum: [ unused, pad, flag, binary, u8, u16, u32, u64, s32, s64,
+ enum: [ unused, pad, flag, binary,
+ uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
doc:
description: Documentation of the attribute.
diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml
index 0a4ae861d011..9ceb096b2df2 100644
--- a/Documentation/netlink/genetlink.yaml
+++ b/Documentation/netlink/genetlink.yaml
@@ -122,7 +122,8 @@ additionalProperties: False
name:
type: string
type: &attr-type
- enum: [ unused, pad, flag, binary, u8, u16, u32, u64, s32, s64,
+ enum: [ unused, pad, flag, binary,
+ uint, sint, u8, u16, u32, u64, s32, s64,
string, nest, array-nest, nest-type-value ]
doc:
description: Documentation of the attribute.
diff --git a/tools/net/ynl/lib/nlspec.py b/tools/net/ynl/lib/nlspec.py
index 37bcb4d8b37b..92889298b197 100644
--- a/tools/net/ynl/lib/nlspec.py
+++ b/tools/net/ynl/lib/nlspec.py
@@ -149,6 +149,7 @@ jsonschema = None
Represents a single attribute type within an attr space.
Attributes:
+ type string, attribute type
value numerical ID when serialized
attr_set Attribute Set containing this attr
is_multi bool, attr may repeat multiple times
@@ -157,10 +158,13 @@ jsonschema = None
len integer, optional byte length of binary types
display_hint string, hint to help choose format specifier
when displaying the value
+
+ is_auto_scalar bool, attr is a variable-size scalar
"""
def __init__(self, family, attr_set, yaml, value):
super().__init__(family, yaml)
+ self.type = yaml['type']
self.value = value
self.attr_set = attr_set
self.is_multi = yaml.get('multi-attr', False)
@@ -170,6 +174,8 @@ jsonschema = None
self.len = yaml.get('len')
self.display_hint = yaml.get('display-hint')
+ self.is_auto_scalar = self.type == "sint" or self.type == "uint"
+
class SpecAttrSet(SpecElement):
""" Netlink Attribute Set class.
diff --git a/tools/net/ynl/lib/ynl.c b/tools/net/ynl/lib/ynl.c
index 514e0d69e731..350ddc247450 100644
--- a/tools/net/ynl/lib/ynl.c
+++ b/tools/net/ynl/lib/ynl.c
@@ -352,6 +352,12 @@ int ynl_attr_validate(struct ynl_parse_arg *yarg, const struct nlattr *attr)
yerr(yarg->ys, YNL_ERROR_ATTR_INVALID,
"Invalid attribute (u64 %s)", policy->name);
return -1;
+ case YNL_PT_UINT:
+ if (len == sizeof(__u32) || len == sizeof(__u64))
+ break;
+ yerr(yarg->ys, YNL_ERROR_ATTR_INVALID,
+ "Invalid attribute (uint %s)", policy->name);
+ return -1;
case YNL_PT_FLAG:
/* Let flags grow into real attrs, why not.. */
break;
diff --git a/tools/net/ynl/lib/ynl.h b/tools/net/ynl/lib/ynl.h
index 9eafa3552c16..87b4dad832f0 100644
--- a/tools/net/ynl/lib/ynl.h
+++ b/tools/net/ynl/lib/ynl.h
@@ -133,6 +133,7 @@ enum ynl_policy_type {
YNL_PT_U16,
YNL_PT_U32,
YNL_PT_U64,
+ YNL_PT_UINT,
YNL_PT_NUL_STR,
};
@@ -234,4 +235,20 @@ int ynl_exec_dump(struct ynl_sock *ys, struct nlmsghdr *req_nlh,
void ynl_error_unknown_notification(struct ynl_sock *ys, __u8 cmd);
int ynl_error_parse(struct ynl_parse_arg *yarg, const char *msg);
+#ifndef MNL_HAS_AUTO_SCALARS
+static inline uint64_t mnl_attr_get_uint(const struct nlattr *attr)
+{
+ if (mnl_attr_get_len(attr) == 4)
+ return mnl_attr_get_u32(attr);
+ return mnl_attr_get_u64(attr);
+}
+
+static inline void
+mnl_attr_put_uint(struct nlmsghdr *nlh, uint16_t type, uint64_t data)
+{
+ if ((uint32_t)data == (uint64_t)data)
+ return mnl_attr_put_u32(nlh, type, data);
+ return mnl_attr_put_u64(nlh, type, data);
+}
+#endif
#endif
diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 28ac35008e65..3b36553a66cc 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -130,6 +130,13 @@ from .nlspec import SpecFamily
format = self.get_format(attr_type, byte_order)
return format.unpack(self.raw)[0]
+ def as_auto_scalar(self, attr_type, byte_order=None):
+ if len(self.raw) != 4 and len(self.raw) != 8:
+ raise Exception(f"Auto-scalar len payload be 4 or 8 bytes, got {len(self.raw)}")
+ real_type = attr_type[0] + str(len(self.raw) * 8)
+ format = self.get_format(real_type, byte_order)
+ return format.unpack(self.raw)[0]
+
def as_strz(self):
return self.raw.decode('ascii')[:-1]
@@ -463,6 +470,11 @@ genl_family_name_to_id = None
attr_payload = bytes.fromhex(value)
else:
raise Exception(f'Unknown type for binary attribute, value: {value}')
+ elif attr.is_auto_scalar:
+ scalar = int(value)
+ real_type = attr["type"][0] + ('32' if scalar.bit_length() <= 32 else '64')
+ format = NlAttr.get_format(real_type, attr.byte_order)
+ attr_payload = format.pack(int(value))
elif attr['type'] in NlAttr.type_formats:
format = NlAttr.get_format(attr['type'], attr.byte_order)
attr_payload = format.pack(int(value))
@@ -529,6 +541,8 @@ genl_family_name_to_id = None
decoded = self._decode_binary(attr, attr_spec)
elif attr_spec["type"] == 'flag':
decoded = True
+ elif attr_spec.is_auto_scalar:
+ decoded = attr.as_auto_scalar(attr_spec['type'], attr_spec.byte_order)
elif attr_spec["type"] in NlAttr.type_formats:
decoded = attr.as_scalar(attr_spec['type'], attr_spec.byte_order)
elif attr_spec["type"] == 'array-nest':
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 6f4c538bda9a..a9e8898c9386 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -335,6 +335,8 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
maybe_enum = not self.is_bitfield and 'enum' in self.attr
if maybe_enum and self.family.consts[self.attr['enum']].enum_name:
self.type_name = f"enum {self.family.name}_{c_lower(self.attr['enum'])}"
+ elif self.is_auto_scalar:
+ self.type_name = '__' + self.type[0] + '64'
else:
self.type_name = '__' + self.type
@@ -362,7 +364,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
return super()._attr_policy(policy)
def _attr_typol(self):
- return f'.type = YNL_PT_U{self.type[1:]}, '
+ return f'.type = YNL_PT_U{c_upper(self.type[1:])}, '
def arg_member(self, ri):
return [f'{self.type_name} {self.c_name}{self.byte_order_comment}']
@@ -1291,7 +1293,7 @@ from lib import SpecFamily, SpecAttrSet, SpecAttr, SpecOperation, SpecEnumSet, S
self.p(line)
-scalars = {'u8', 'u16', 'u32', 'u64', 's32', 's64'}
+scalars = {'u8', 'u16', 'u32', 'u64', 's32', 's64', 'uint', 'sint'}
direction_to_suffix = {
'reply': '_rsp',
--
2.41.0
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