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Date: Thu, 10 Apr 2025 08:28:32 +0300 (IDT)
From: "Etelson, Gregory" <getelson@nvidia.com>
To: Bruce Richardson <bruce.richardson@intel.com>
cc: dev@dpdk.org
Subject: Re: [RFC PATCH] add rust binding support to DPDK
In-Reply-To: <20250408145838.2501034-1-bruce.richardson@intel.com>
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Errors-To: dev-bounces@dpdk.org
Hello Bruce,
> Add a Cargo.toml file in the root folder and a number of other scripts
> and rust-related files into buildtools/rust, which then enables DPDK to
> be cloned and built as a rust crate - all-be-it one with only two
> functions: rte_eal_init and rte_eal_cleanup.
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
>
> This RFC is proposed as an alternative approach to enabling rust support
> in DPDK. The key difference vs previous is that we are taking the whole
> DPDK project here as a rust "crate", which can then be used by other
> higher-level crates as a dependency. Building the crate does a
> (minimal) build of DPDK and statically links it in, so there is no
> "install" step or anything needed - the Rust app just adds DPDK to their
> Cargo.toml file and then should have everything they need.
>
Having a shared source directory for both for C and Rust DPDK infrastructure is
the correct approach.
My concern is how to properly maintain Rust crate once DPDK starts to implement
it's own API.
Rust files may need a separate directories to host libraries, applications
and PMD.
> diff --git a/Cargo.toml b/Cargo.toml
> new file mode 100644
> index 0000000000..fe0843975a
> --- /dev/null
> +++ b/Cargo.toml
> @@ -0,0 +1,16 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright(c) 2025 Intel Corporation
> +
> +[package]
> +name = "dpdk-c"
> +version = "25.0.7"
> +build = "buildtools/rust/build.rs"
> +edition = "2021"
> +
> +[lib]
> +path = "buildtools/rust/lib.rs"
> +doctest = false
> +
> +[build-dependencies]
> +bindgen = "0.71"
> +meson-next = "1"
> diff --git a/buildtools/meson.build b/buildtools/meson.build
> index 4e2c1217a2..a13b5189c1 100644
> --- a/buildtools/meson.build
> +++ b/buildtools/meson.build
> @@ -26,6 +26,7 @@ header_gen_cmd = py3 + files('gen-header.py')
> has_hugepages_cmd = py3 + files('has-hugepages.py')
> cmdline_gen_cmd = py3 + files('dpdk-cmdline-gen.py')
> check_dts_requirements = py3 + files('check-dts-requirements.py')
> +gen_cargo_bindgen_info = py3 + files('rust/gen-cargo-bindgen-info.py')
>
> # install any build tools that end-users might want also
> install_data([
> diff --git a/buildtools/rust/build.rs b/buildtools/rust/build.rs
> new file mode 100644
> index 0000000000..1ffdf03d2f
> --- /dev/null
> +++ b/buildtools/rust/build.rs
> @@ -0,0 +1,45 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2025 Intel Corporation
> + */
> +
> +extern crate meson_next as meson;
> +use std::collections::HashMap;
> +use std::env;
> +use std::path::PathBuf;
> +
> +fn main() {
> + let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
> + let build_dir = out_path.join("build");
> +
> + let meson_cfg = meson::Config::new().options(HashMap::from([
> + ("enable_libs", "eal"),
> + ("enable_drivers", "net/*,net/intel/*"),
> + ("enable_apps", "test")
> + ]));
> + meson::build(".", build_dir.to_str().unwrap(), meson_cfg);
> +
> + /* open and print file 'cargo_rules.txt' from build_dir */
> + let cargo_ldflags_file = build_dir.join("cargo_ldflags.txt");
> + println!("cargo:rerun-if-changed={}", cargo_ldflags_file.display());
> + print!("{}", std::fs::read_to_string(cargo_ldflags_file).unwrap());
> +
> + let bindgen_include_file = build_dir.join("bindgen_cflags.txt");
> + let mut bindings = bindgen::Builder::default();
> + for line in std::fs::read_to_string(bindgen_include_file).unwrap().lines() {
> + bindings = bindings.clang_arg(line);
> + }
> +
> + let bindings = bindings.header("buildtools/rust/wrapper.h")
> + .derive_default(true)
> + .allowlist_function("rte_eal_init")
> + .allowlist_function("rte_eal_cleanup")
Calling the `allowlist_function()` method generates well-maintained target
bindings.
That approach requires to specify each DPDK symbol for Rust
library API explicitly. There are way too many symbols to bind even for
a simple network application.
> + // Tell cargo to invalidate the built crate whenever any of the
> + // included header files changed.
> + .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
> + .generate()
> + .expect("Unable to generate bindings");
> +
> + bindings
> + .write_to_file(out_path.join("bindings.rs"))
> + .expect("Couldn't write bindings!");
> +}
Bindings file or directory for RTE library API is not enough.
Each PMD has it's own symbols set and will need a separate bindings library.
> diff --git a/buildtools/rust/gen-cargo-bindgen-info.py b/buildtools/rust/gen-cargo-bindgen-info.py
> new file mode 100644
> index 0000000000..bea432ead3
> --- /dev/null
> +++ b/buildtools/rust/gen-cargo-bindgen-info.py
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: BSD-3-Clause
> +# Copyright(c) 2025 Intel Corporation
> +
> +# Script to generate cargo rules for static linking in rust builds
> +# outputs one line per library, for drivers and libraries
> +
> +import os
> +import os.path
> +import sys
> +import subprocess
> +
> +if 'MESON_BUILD_ROOT' not in os.environ:
> + print('This script must be called from a meson build environment')
> + sys.exit(1)
> +
> +pkgconf = sys.argv[1]
> +os.environ['PKG_CONFIG_PATH'] = os.path.join(os.environ['MESON_BUILD_ROOT'], 'meson-uninstalled')
> +linker_flags = subprocess.check_output([pkgconf, '--libs', '--static', 'libdpdk']).decode('utf-8')
> +cflags = subprocess.check_output([pkgconf, '--cflags', 'libdpdk']).decode('utf-8')
> +
> +whole_archive = False
> +with open(os.path.join(os.environ['MESON_BUILD_ROOT'], 'cargo_ldflags.txt'), 'w') as dst:
> + for flag in linker_flags.split():
> + if flag == '-pthread':
> + continue
> + elif flag == '-Wl,--whole-archive':
> + whole_archive = True
> + elif flag == '-Wl,--no-whole-archive':
> + whole_archive = False
> + elif flag.startswith('-L'):
> + dst.write(f'cargo:rustc-link-search=native={flag[2:]}\n')
> + elif flag.startswith('-l:'):
> + libname = flag[3:]
> + if libname.startswith('lib'):
> + libname = libname[3:]
> + if libname.endswith('.a'):
> + libname = libname[:-2]
> + if whole_archive:
> + dst.write(f'cargo:rustc-link-lib=static:+whole-archive={libname}\n')
> + else:
> + dst.write(f'cargo:rustc-link-lib=static={libname}\n')
> + elif flag.startswith('-lrte_'):
> + # skip any other DPDK lib flags, we already have them above
> + continue
> + elif flag.startswith('-l'):
> + dst.write(f'cargo:rustc-link-lib={flag[2:]}\n')
> + else:
> + print(f'Warning: Unknown flag: {flag}', file=sys.stderr)
> +
> +with open(os.path.join(os.environ['MESON_BUILD_ROOT'], 'bindgen_cflags.txt'), 'w') as dst:
> + for flag in cflags.split():
> + dst.write(f'{flag}\n')
> diff --git a/buildtools/rust/lib.rs b/buildtools/rust/lib.rs
> new file mode 100644
> index 0000000000..f99c54ac42
> --- /dev/null
> +++ b/buildtools/rust/lib.rs
> @@ -0,0 +1,25 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2025 Intel Corporation
> + */
> +
> +#![allow(non_upper_case_globals)]
> +#![allow(non_camel_case_types)]
> +#![allow(non_snake_case)]
> +
> +include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
> +
> +#[cfg(test)]
> +mod tests {
> + use super::*;
> +
> + #[test]
> + fn test_helloworld() {
> + let appname = std::ffi::CString::new("test-rs").unwrap();
> + let mut argv = [appname.into_raw()];
> + let ret = unsafe {
> + rte_eal_init(argv.len().try_into().unwrap(), argv.as_mut_ptr())
Activating rte_eal_init() proves that Rust crate has properly linked with DPDK
libraries.
That is more like infrastructure test.
An active network port with IO capabilities is a real Rust-DPDK POC.
> + };
> + assert!(ret >= 0, "rte_eal_init failed");
> + unsafe { rte_eal_cleanup() };
> + }
> +}
> diff --git a/buildtools/rust/wrapper.h b/buildtools/rust/wrapper.h
> new file mode 100644
> index 0000000000..25f5bf94e2
> --- /dev/null
> +++ b/buildtools/rust/wrapper.h
> @@ -0,0 +1,5 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2025 Intel Corporation
> + */
> +
> +#include <rte_eal.h>
> diff --git a/meson.build b/meson.build
> index 8436d1dff8..72c82178e1 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -114,6 +114,9 @@ configure_file(output: build_cfg,
> # build pkg-config files for dpdk
> subdir('buildtools/pkg-config')
>
> +# output a list of cargo parameters if DPDK is being built for rust use
> +run_command([gen_cargo_bindgen_info, pkgconf], check: true)
> +
> if meson.is_subproject()
> subdir('buildtools/subproject')
> endif
> --
> 2.45.2
>
>
Regards,
Gregory