netsim: Add pdl_rust rule & gen rust for netsim pdl files.

For netsimd.

Bug: b/402294843

Author: jacky8hyf

base/cvd/BUILD.android_tools_netsim.bazel

@@ -1,3 +1,4 @@
+load("@@//build_external/netsim:pdl_rust.bzl", "pdl_rust")
 load("@bazel_skylib//rules:run_binary.bzl", "run_binary")
 load("@netsim_crates//:defs.bzl", "all_crate_deps")
 load("@protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
@@ -6,6 +7,36 @@ load("@rules_proto//proto:defs.bzl", "proto_library")
 load("@rules_proto_grpc_cpp//:defs.bzl", "cpp_grpc_library")
 load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library")
 
+pdl_rust(
+    name = "netsim_netlink_rust_gen",
+    src = "pdl/netlink.pdl",
+    out = "netlink_packets.rs",
+)
+
+pdl_rust(
+    name = "netsim_mac80211_hwsim_rust_gen",
+    src = "pdl/mac80211_hwsim.pdl",
+    out = "mac80211_hwsim_packets.rs",
+)
+
+pdl_rust(
+    name = "netsim_ieee80211_rust_gen",
+    src = "pdl/ieee80211.pdl",
+    out = "ieee80211_packets.rs",
+)
+
+pdl_rust(
+    name = "netsim_llc_rust_gen",
+    src = "pdl/llc.pdl",
+    out = "llc_packets.rs",
+)
+
+pdl_rust(
+    name = "netsim_arp_rust_gen",
+    src = "pdl/arp.pdl",
+    out = "arp_packets.rs",
+)
+
 rust_library(
     name = "libnetsim_proto",
     srcs = glob(["rust/proto/src/**/*.rs"]),

base/cvd/build_external/netsim/pdl_rust.bzl

@@ -0,0 +1,29 @@
+"""Run pdlc --output-format rust"""
+
+def _pdl_rust_impl(ctx):
+    out = ctx.actions.declare_file(ctx.attr.out)
+    ctx.actions.run_shell(
+        tools = [ctx.executable._pdlc],
+        inputs = [ctx.file.src],
+        outputs = [out],
+        command = "{pdlc} --output-format rust {src} > {out}".format(
+            pdlc = ctx.executable._pdlc.path,
+            src = ctx.file.src.path,
+            out = out.path,
+        ),
+    )
+    return DefaultInfo(files = depset([out]))
+
+pdl_rust = rule(
+    implementation = _pdl_rust_impl,
+    attrs = {
+        "src": attr.label(allow_single_file = True),
+        "out": attr.string(mandatory = True),
+        "_pdlc": attr.label(
+            # Any crates with pdl-compiler would work.
+            default = "@netsim_crates//:pdl-compiler__pdlc",
+            executable = True,
+            cfg = "exec",
+        ),
+    },
+)