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Wed, 15 Apr 2026 02:39:34 -0700 (PDT) Date: Wed, 15 Apr 2026 09:37:52 +0000 In-Reply-To: <20260415-binder-netlink-v3-0-84be9ba63ee2@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260415-binder-netlink-v3-0-84be9ba63ee2@google.com> X-Developer-Key: i=aliceryhl@google.com; a=openpgp; fpr=49F6C1FAA74960F43A5B86A1EE7A392FDE96209F X-Developer-Signature: v=1; a=openpgp-sha256; l=7884; i=aliceryhl@google.com; h=from:subject:message-id; bh=pYERZwVis0sfOfVf5rbB7rXtctv5TUqHOfYeJEFG54Y=; b=owEBbQKS/ZANAwAKAQRYvu5YxjlGAcsmYgBp31zOwI1Z/qaXVGkJIb+gdFwKml7bNTySwX69G 2ICiC51d42JAjMEAAEKAB0WIQSDkqKUTWQHCvFIvbIEWL7uWMY5RgUCad9czgAKCRAEWL7uWMY5 RiU7EACgpzsMvxPt41bivzL0Ky3Ir1wanoaWgKiUkEaTa9qcCksjaXn+nwG8UHENQNVUdmjxj0H 2e+Nixx06lM/jaCHbn+i70GZIdbXOBvpMy88IiFUbhCBkmGnFwkdk2MVNTWxf0IvbIycPVI26EQ IVP7dtKeIQmWl2SdAXrNMW5SrG2hMCn3l8qWY6KFxmgY39JhK0QhDyspdiLfKbkAQqa3qzknZ5h x6WbRw2MeyFGMo+gkhnPB+yiE8FmqYoY8Aw4vtl4Ryy6r/UWVnKECilnbl8tSjJgT1VhtNJdEWF X2dVhEGRpBJWrY5CUT2L3pc/BO0tcekb7m0ubJy+2LUrelV7hxqpwCV7mY/5KiRGaeK8DLIFVOY lpnhgie+tdEhRkY3g5LE52t+0scgU2CGFcN82nVUqIK+8l6Rg3HXbbCwKkaPbGNuN7sehlkL/g2 y8OK2mW9yJzqKQfgFXDeC2SVb0aaoCGRD2jqMCl3ZI4hyumbaTC1cDERa4XDl/SGBgchj0pnyUz +e4Y5eah6cbtZ+vZ3/0kexizpAaqwdWRH0NFA7St1gwz092UNWmHn7JXBM1BnATnsQvTmfe6ctp tKklg5CoO+DXV/wfX3IRDE7dj3ub2RuIzJynjsWY07mWe7a34rIzDKFaBOwlkWeUzzD3eNxADcf 2sGuJUCBT8rA6Iw== X-Mailer: b4 0.14.3 Message-ID: <20260415-binder-netlink-v3-2-84be9ba63ee2@google.com> Subject: [PATCH v3 2/4] ynl_gen: generate Rust files from yaml files From: Alice Ryhl To: Miguel Ojeda , Boqun Feng , Gary Guo , "=?utf-8?q?Bj=C3=B6rn_Roy_Baron?=" , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Greg Kroah-Hartman , "=?utf-8?q?Arve_Hj=C3=B8nnev=C3=A5g?=" , Todd Kjos , Christian Brauner , Carlos Llamas Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, netdev@vger.kernel.org, Alice Ryhl Content-Type: text/plain; charset="utf-8" To generate netlink frames from Rust code easily, generate Rust libraries with methods for generating different netlink messages as appropriate. The new 'rust' type corresponds to a Rust version of the C target 'kernel'. There is no Rust version of the 'uapi' target since Rust code exports its uapi via C headers - choice of language is opaque to userspace. This logic is kept in the existing ynl_gen_c.py file to reuse CodeWriter and other shared pieces of logic in the existing python file. This has the disadvantage that the gen_c part of the name is now wrong, as it also generates Rust. One possible solution to this could be to rename the file. Signed-off-by: Alice Ryhl --- tools/net/ynl/pyynl/ynl_gen_c.py | 139 ++++++++++++++++++++++++++++++++++++++- tools/net/ynl/ynl-regen.sh | 2 +- 2 files changed, 139 insertions(+), 2 deletions(-) diff --git a/tools/net/ynl/pyynl/ynl_gen_c.py b/tools/net/ynl/pyynl/ynl_gen_c.py index 0e1e486c1185..76b8b2f1ac16 100755 --- a/tools/net/ynl/pyynl/ynl_gen_c.py +++ b/tools/net/ynl/pyynl/ynl_gen_c.py @@ -19,6 +19,7 @@ import pathlib import os import re import shutil +import subprocess import sys import tempfile import yaml as pyyaml @@ -1744,6 +1745,19 @@ class CodeWriter: else: self.p('}' + line) + def array_start(self, line=''): + if line: + line = line + ' ' + self.p(line + '[') + self._ind += 1 + + def array_end(self, line=''): + if line and line[0] not in {';', ','}: + line = ' ' + line + self._ind -= 1 + self._nl = False + self.p(']' + line) + def write_doc_line(self, doc, indent=True): words = doc.split() line = ' *' @@ -3415,10 +3429,126 @@ def find_kernel_root(full_path): return full_path, sub_path[:-1] +def render_rust(family, cw): + cw.p('#![allow(unreachable_pub, clippy::wrong_self_convention)]') + cw.p('use kernel::netlink::{Family, MulticastGroup};') + cw.p('use kernel::prelude::*;') + cw.nl() + + family_upper = c_upper(family.ident_name) + family_name = f'{family_upper}_NL_FAMILY' + mcgrps_name = f'{family_name}_MCGRPS' + + cw.p(f'pub static {family_name}: Family = Family::const_new(') + cw._ind += 1 + cw.p('&crate::THIS_MODULE,') + cw.p(f'kernel::uapi::{family.fam_key},') + cw.p(f'kernel::uapi::{family.ver_key},') + if family.mcgrps['list']: + cw.p(f'&{mcgrps_name},') + else: + cw.p('&[],') + cw._ind -= 1 + cw.p(');') + cw.nl() + + if family.mcgrps['list']: + cw.array_start(f'static {mcgrps_name}: [MulticastGroup; {len(family.mcgrps["list"])}] = ') + for grp in family.mcgrps['list']: + cw.p(f'MulticastGroup::const_new(c"{grp["name"]}"),') + cw.array_end(';') + cw.nl() + + for idx, (op_name, op) in enumerate(item for item in family.msgs.items() if 'event' in item[1]): + struct_name = op_name.capitalize() + + if 'doc' in op: + doc_lines = op['doc'].strip().split('\n') + for line in doc_lines: + cw.p(f'/// {line.strip()}') + + cw.block_start(f'pub struct {struct_name}') + cw.p('skb: kernel::netlink::GenlMsg,') + cw.block_end() + cw.nl() + + cw.block_start(f'impl {struct_name}') + cw.p('/// Create a new multicast message.') + cw.p('pub fn new(') + cw._ind += 1 + cw.p('size: usize,') + cw.p('portid: u32,') + cw.p('seq: u32,') + cw.p('flags: kernel::alloc::Flags,') + cw._ind -= 1 + cw.block_start(') -> Result') + cw.p(f'const {op.enum_name}: u8 = kernel::uapi::{op.enum_name} as u8;') + cw.p('let skb = kernel::netlink::NetlinkSkBuff::new(size, flags)?;') + cw.p(f'let skb = skb.genlmsg_put(portid, seq, &{family_name}, {op.enum_name})?;') + cw.p('Ok(Self { skb })') + cw.block_end() + cw.nl() + + grp_idx = 0 + if 'mcgrp' in op: + grp_idx = next(i for i, grp in enumerate(family.mcgrps['list']) if grp['name'] == op['mcgrp']) + + cw.p('/// Broadcast this message.') + cw.block_start('pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -> Result') + cw.p(f'self.skb.multicast(&{family_name}, portid, {grp_idx}, flags)') + cw.block_end() + cw.nl() + + cw.p('/// Check if this message type has listeners.') + cw.block_start('pub fn has_listeners() -> bool') + cw.p(f'{family_name}.has_listeners({grp_idx})') + cw.block_end() + + attr_set_name = op['attribute-set'] + attr_set = family.attr_sets[attr_set_name] + event_attrs = op['event']['attributes'] + + for attr_name in event_attrs: + attr = attr_set[attr_name] + method_name = attr_name.replace('-', '_') + + if attr.type == 'u32': + put_fn = 'put_u32' + arg_str = ', val' + method_args = '(&mut self, val: u32)' + elif attr.type == 'string': + put_fn = 'put_string' + arg_str = ', val' + method_args = '(&mut self, val: &CStr)' + elif attr.type == 'flag': + put_fn = 'put_flag' + arg_str = '' + method_args = '(&mut self)' + else: + put_fn = f'put_{attr.type}' + arg_str = ', val' + method_args = f'(&mut self, val: {attr.type})' + + cw.nl() + if 'doc' in attr.yaml: + doc_lines = attr.yaml['doc'].strip().split('\n') + for line in doc_lines: + cw.p(f'/// {line.strip()}') + + cw.block_start(f'pub fn {method_name}{method_args} -> Result') + cw.p(f'const {attr.enum_name}: c_int = kernel::uapi::{attr.enum_name} as c_int;') + cw.p(f'self.skb.{put_fn}({attr.enum_name}{arg_str})') + cw.block_end() + + cw.block_end() + cw.nl() + cw.p(' ') + + def main(): parser = argparse.ArgumentParser(description='Netlink simple parsing generator') parser.add_argument('--mode', dest='mode', type=str, required=True, - choices=('user', 'kernel', 'uapi')) + choices=('user', 'kernel', 'uapi', 'rust')) parser.add_argument('--spec', dest='spec', type=str, required=True) parser.add_argument('--header', dest='header', action='store_true', default=None) parser.add_argument('--source', dest='header', action='store_false') @@ -3471,6 +3601,13 @@ def main(): render_uapi(parsed, cw) return + if args.mode == 'rust': + render_rust(parsed, cw) + cw.close_out_file() + if args.out_file: + subprocess.run(['rustfmt', '--edition', '2021', args.out_file]) + return + hdr_prot = f"_LINUX_{parsed.c_name.upper()}_GEN_H" if args.header: cw.p('#ifndef ' + hdr_prot) diff --git a/tools/net/ynl/ynl-regen.sh b/tools/net/ynl/ynl-regen.sh index d9809276db98..4f5ceb4fe147 100755 --- a/tools/net/ynl/ynl-regen.sh +++ b/tools/net/ynl/ynl-regen.sh @@ -17,7 +17,7 @@ done KDIR=$(dirname $(dirname $(dirname $(dirname $(realpath $0))))) pushd ${search:-$KDIR} >>/dev/null -files=$(git grep --files-with-matches '^/\* YNL-GEN \(kernel\|uapi\|user\)') +files=$(git grep --files-with-matches '^/\* YNL-GEN \(kernel\|uapi\|user\|rust\)') for f in $files; do # params: 0 1 2 3 # $YAML YNL-GEN kernel $mode -- 2.54.0.rc0.605.g598a273b03-goog