tools: ynl: create local attribute helpers

Don't use mnl attr helpers, we're trying to remove the libmnl
dependency. Create both signed and unsigned helpers, libmnl
had unsigned helpers, so code generator no longer needs
the mnl_type() hack.

The new helpers are written from first principles, but are
hopefully not too buggy.

Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://lore.kernel.org/r/20240227223032.1835527-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 23 insertions, 38 deletions

diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 7fc1aa788f6f..99a3eb7b158b 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -168,15 +168,6 @@ class Type(SpecAttr):
         spec = self._attr_policy(policy)
         cw.p(f"\t[{self.enum_name}] = {spec},")
 
-    def _mnl_type(self):
-        # mnl does not have helpers for signed integer types
-        # turn signed type into unsigned
-        # this only makes sense for scalar types
-        t = self.type
-        if t[0] == 's':
-            t = 'u' + t[1:]
-        return t
-
     def _attr_typol(self):
         raise Exception(f"Type policy not implemented for class type {self.type}")
 
@@ -192,7 +183,7 @@ class Type(SpecAttr):
         ri.cw.p(f"{line};")
 
     def _attr_put_simple(self, ri, var, put_type):
-        line = f"mnl_attr_put_{put_type}(nlh, {self.enum_name}, {var}->{self.c_name})"
+        line = f"ynl_attr_put_{put_type}(nlh, {self.enum_name}, {var}->{self.c_name})"
         self._attr_put_line(ri, var, line)
 
     def attr_put(self, ri, var):
@@ -357,9 +348,6 @@ class TypeScalar(Type):
         else:
             self.type_name = '__' + self.type
 
-    def mnl_type(self):
-        return self._mnl_type()
-
     def _attr_policy(self, policy):
         if 'flags-mask' in self.checks or self.is_bitfield:
             if self.is_bitfield:
@@ -387,10 +375,10 @@ class TypeScalar(Type):
         return [f'{self.type_name} {self.c_name}{self.byte_order_comment}']
 
     def attr_put(self, ri, var):
-        self._attr_put_simple(ri, var, self.mnl_type())
+        self._attr_put_simple(ri, var, self.type)
 
     def _attr_get(self, ri, var):
-        return f"{var}->{self.c_name} = mnl_attr_get_{self.mnl_type()}(attr);", None, None
+        return f"{var}->{self.c_name} = ynl_attr_get_{self.type}(attr);", None, None
 
     def _setter_lines(self, ri, member, presence):
         return [f"{member} = {self.c_name};"]
@@ -404,7 +392,7 @@ class TypeFlag(Type):
         return '.type = YNL_PT_FLAG, '
 
     def attr_put(self, ri, var):
-        self._attr_put_line(ri, var, f"mnl_attr_put(nlh, {self.enum_name}, 0, NULL)")
+        self._attr_put_line(ri, var, f"ynl_attr_put(nlh, {self.enum_name}, NULL, 0)")
 
     def _attr_get(self, ri, var):
         return [], None, None
@@ -446,15 +434,15 @@ class TypeString(Type):
         cw.p(f"\t[{self.enum_name}] = {spec},")
 
     def attr_put(self, ri, var):
-        self._attr_put_simple(ri, var, 'strz')
+        self._attr_put_simple(ri, var, 'str')
 
     def _attr_get(self, ri, var):
         len_mem = var + '->_present.' + self.c_name + '_len'
         return [f"{len_mem} = len;",
                 f"{var}->{self.c_name} = malloc(len + 1);",
-                f"memcpy({var}->{self.c_name}, mnl_attr_get_str(attr), len);",
+                f"memcpy({var}->{self.c_name}, ynl_attr_get_str(attr), len);",
                 f"{var}->{self.c_name}[len] = 0;"], \
-               ['len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));'], \
+               ['len = strnlen(ynl_attr_get_str(attr), ynl_attr_data_len(attr));'], \
                ['unsigned int len;']
 
     def _setter_lines(self, ri, member, presence):
@@ -493,15 +481,15 @@ class TypeBinary(Type):
         return mem
 
     def attr_put(self, ri, var):
-        self._attr_put_line(ri, var, f"mnl_attr_put(nlh, {self.enum_name}, " +
-                            f"{var}->_present.{self.c_name}_len, {var}->{self.c_name})")
+        self._attr_put_line(ri, var, f"ynl_attr_put(nlh, {self.enum_name}, " +
+                            f"{var}->{self.c_name}, {var}->_present.{self.c_name}_len)")
 
     def _attr_get(self, ri, var):
         len_mem = var + '->_present.' + self.c_name + '_len'
         return [f"{len_mem} = len;",
                 f"{var}->{self.c_name} = malloc(len);",
-                f"memcpy({var}->{self.c_name}, mnl_attr_get_payload(attr), len);"], \
-               ['len = mnl_attr_get_payload_len(attr);'], \
+                f"memcpy({var}->{self.c_name}, ynl_attr_data(attr), len);"], \
+               ['len = ynl_attr_data_len(attr);'], \
                ['unsigned int len;']
 
     def _setter_lines(self, ri, member, presence):
@@ -526,11 +514,11 @@ class TypeBitfield32(Type):
         return f"NLA_POLICY_BITFIELD32({mask})"
 
     def attr_put(self, ri, var):
-        line = f"mnl_attr_put(nlh, {self.enum_name}, sizeof(struct nla_bitfield32), &{var}->{self.c_name})"
+        line = f"ynl_attr_put(nlh, {self.enum_name}, &{var}->{self.c_name}, sizeof(struct nla_bitfield32))"
         self._attr_put_line(ri, var, line)
 
     def _attr_get(self, ri, var):
-        return f"memcpy(&{var}->{self.c_name}, mnl_attr_get_payload(attr), sizeof(struct nla_bitfield32));", None, None
+        return f"memcpy(&{var}->{self.c_name}, ynl_attr_data(attr), sizeof(struct nla_bitfield32));", None, None
 
     def _setter_lines(self, ri, member, presence):
         return [f"memcpy(&{member}, {self.c_name}, sizeof(struct nla_bitfield32));"]
@@ -589,9 +577,6 @@ class TypeMultiAttr(Type):
     def presence_type(self):
         return 'count'
 
-    def mnl_type(self):
-        return self._mnl_type()
-
     def _complex_member_type(self, ri):
         if 'type' not in self.attr or self.attr['type'] == 'nest':
             return self.nested_struct_type
@@ -625,9 +610,9 @@ class TypeMultiAttr(Type):
 
     def attr_put(self, ri, var):
         if self.attr['type'] in scalars:
-            put_type = self.mnl_type()
+            put_type = self.type
             ri.cw.p(f"for (unsigned int i = 0; i < {var}->n_{self.c_name}; i++)")
-            ri.cw.p(f"mnl_attr_put_{put_type}(nlh, {self.enum_name}, {var}->{self.c_name}[i]);")
+            ri.cw.p(f"ynl_attr_put_{put_type}(nlh, {self.enum_name}, {var}->{self.c_name}[i]);")
         elif 'type' not in self.attr or self.attr['type'] == 'nest':
             ri.cw.p(f"for (unsigned int i = 0; i < {var}->n_{self.c_name}; i++)")
             self._attr_put_line(ri, var, f"{self.nested_render_name}_put(nlh, " +
@@ -690,8 +675,8 @@ class TypeNestTypeValue(Type):
             local_vars += [f'__u32 {", ".join(tv_names)};']
             for level in self.attr["type-value"]:
                 level = c_lower(level)
-                get_lines += [f'attr_{level} = mnl_attr_get_payload({prev});']
-                get_lines += [f'{level} = mnl_attr_get_type(attr_{level});']
+                get_lines += [f'attr_{level} = ynl_attr_data({prev});']
+                get_lines += [f'{level} = ynl_attr_type(attr_{level});']
                 prev = 'attr_' + level
 
             tv_args = f", {', '.join(tv_names)}"
@@ -1612,12 +1597,12 @@ def put_req_nested(ri, struct):
     ri.cw.block_start()
     ri.cw.write_func_lvar('struct nlattr *nest;')
 
-    ri.cw.p("nest = mnl_attr_nest_start(nlh, attr_type);")
+    ri.cw.p("nest = ynl_attr_nest_start(nlh, attr_type);")
 
     for _, arg in struct.member_list():
         arg.attr_put(ri, "obj")
 
-    ri.cw.p("mnl_attr_nest_end(nlh, nest);")
+    ri.cw.p("ynl_attr_nest_end(nlh, nest);")
 
     ri.cw.nl()
     ri.cw.p('return 0;')
@@ -1674,7 +1659,7 @@ def _multi_parse(ri, struct, init_lines, local_vars):
 
     ri.cw.nl()
     ri.cw.block_start(line=iter_line)
-    ri.cw.p('unsigned int type = mnl_attr_get_type(attr);')
+    ri.cw.p('unsigned int type = ynl_attr_type(attr);')
     ri.cw.nl()
 
     first = True
@@ -1696,7 +1681,7 @@ def _multi_parse(ri, struct, init_lines, local_vars):
         ri.cw.p(f"parg.rsp_policy = &{aspec.nested_render_name}_nest;")
         ri.cw.block_start(line=f"mnl_attr_for_each_nested(attr, attr_{aspec.c_name})")
         ri.cw.p(f"parg.data = &dst->{aspec.c_name}[i];")
-        ri.cw.p(f"if ({aspec.nested_render_name}_parse(&parg, attr, mnl_attr_get_type(attr)))")
+        ri.cw.p(f"if ({aspec.nested_render_name}_parse(&parg, attr, ynl_attr_type(attr)))")
         ri.cw.p('return MNL_CB_ERROR;')
         ri.cw.p('i++;')
         ri.cw.block_end()
@@ -1712,13 +1697,13 @@ def _multi_parse(ri, struct, init_lines, local_vars):
         if 'nested-attributes' in aspec:
             ri.cw.p(f"parg.rsp_policy = &{aspec.nested_render_name}_nest;")
         ri.cw.block_start(line=iter_line)
-        ri.cw.block_start(line=f"if (mnl_attr_get_type(attr) == {aspec.enum_name})")
+        ri.cw.block_start(line=f"if (ynl_attr_type(attr) == {aspec.enum_name})")
         if 'nested-attributes' in aspec:
             ri.cw.p(f"parg.data = &dst->{aspec.c_name}[i];")
             ri.cw.p(f"if ({aspec.nested_render_name}_parse(&parg, attr))")
             ri.cw.p('return MNL_CB_ERROR;')
         elif aspec.type in scalars:
-            ri.cw.p(f"dst->{aspec.c_name}[i] = mnl_attr_get_{aspec.mnl_type()}(attr);")
+            ri.cw.p(f"dst->{aspec.c_name}[i] = ynl_attr_get_{aspec.type}(attr);")
         else:
             raise Exception('Nest parsing type not supported yet')
         ri.cw.p('i++;')