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tools: ynl: add display-hint support to ynl 

Add support to the ynl tool for rendering output based on display-hint
properties.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20230623201928.14275-3-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Donald Hunter 2023-06-23 21:19:27 +01:00 committed by Jakub Kicinski
parent 737eab775d
commit d8eea68d91
2 changed files with 39 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/net/ynl/lib/nlspec.py
View File

@ -154,6 +154,9 @@ class SpecAttr(SpecElement):
is_multi bool, attr may repeat multiple times
struct_name string, name of struct definition
sub_type string, name of sub type
len integer, optional byte length of binary types
display_hint string, hint to help choose format specifier
when displaying the value
"""
def __init__(self, family, attr_set, yaml, value):
super().__init__(family, yaml)
@ -164,6 +167,8 @@ class SpecAttr(SpecElement):
self.struct_name = yaml.get('struct')
self.sub_type = yaml.get('sub-type')
self.byte_order = yaml.get('byte-order')
self.len = yaml.get('len')
self.display_hint = yaml.get('display-hint')
class SpecAttrSet(SpecElement):
@ -229,12 +234,17 @@ class SpecStructMember(SpecElement):
type string, type of the member attribute
byte_order string or None for native byte order
enum string, name of the enum definition
len integer, optional byte length of binary types
display_hint string, hint to help choose format specifier
when displaying the value
"""
def __init__(self, family, yaml):
super().__init__(family, yaml)
self.type = yaml['type']
self.byte_order = yaml.get('byte-order')
self.enum = yaml.get('enum')
self.len = yaml.get('len')
self.display_hint = yaml.get('display-hint')
class SpecStruct(SpecElement):

34
tools/net/ynl/lib/ynl.py
View File

@ -8,6 +8,8 @@ import socket
import struct
from struct import Struct
import yaml
import ipaddress
import uuid
from .nlspec import SpecFamily
@ -105,6 +107,20 @@ class NlAttr:
else format.little
return format.native
@classmethod
def formatted_string(cls, raw, display_hint):
if display_hint == 'mac':
formatted = ':'.join('%02x' % b for b in raw)
elif display_hint == 'hex':
formatted = bytes.hex(raw, ' ')
elif display_hint in [ 'ipv4', 'ipv6' ]:
formatted = format(ipaddress.ip_address(raw))
elif display_hint == 'uuid':
formatted = str(uuid.UUID(bytes=raw))
else:
formatted = raw
return formatted
def as_scalar(self, attr_type, byte_order=None):
format = self.get_format(attr_type, byte_order)
return format.unpack(self.raw)[0]
@ -124,10 +140,16 @@ class NlAttr:
offset = 0
for m in members:
# TODO: handle non-scalar members
format = self.get_format(m.type, m.byte_order)
decoded = format.unpack_from(self.raw, offset)
offset += format.size
value[m.name] = decoded[0]
if m.type == 'binary':
decoded = self.raw[offset:offset+m['len']]
offset += m['len']
elif m.type in NlAttr.type_formats:
format = self.get_format(m.type, m.byte_order)
[ decoded ] = format.unpack_from(self.raw, offset)
offset += format.size
if m.display_hint:
decoded = self.formatted_string(decoded, m.display_hint)
value[m.name] = decoded
return value
def __repr__(self):
@ -385,7 +407,7 @@ class YnlFamily(SpecFamily):
elif attr["type"] == 'string':
attr_payload = str(value).encode('ascii') + b'\x00'
elif attr["type"] == 'binary':
attr_payload = value
attr_payload = bytes.fromhex(value)
elif attr['type'] in NlAttr.type_formats:
format = NlAttr.get_format(attr['type'], attr.byte_order)
attr_payload = format.pack(int(value))
@ -421,6 +443,8 @@ class YnlFamily(SpecFamily):
decoded = attr.as_c_array(attr_spec.sub_type)
else:
decoded = attr.as_bin()
if attr_spec.display_hint:
decoded = NlAttr.formatted_string(decoded, attr_spec.display_hint)
return decoded
def _decode(self, attrs, space):