Add bazel build system support for simple_switch_grpc

.bazelrc

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Use Bzlmod (`MODULE.bazel`) instead of `WORKSPACE.bazel`.
+common --enable_bzlmod
+common --noenable_workspace
+
+# In Bazel 9, native C++ rules are no longer injected into the global namespace
+# by default.  Two files in grpc 1.76.0 still use native.cc_*:
+#   bazel/cython_library.bzl      (native.cc_binary)
+#   third_party/address_sorting/address_sorting.bzl  (native.cc_library)
+# Restore the autoload until grpc 1.76.0.bcr.2 lands.  No-op on Bazel 7/8.
+build --incompatible_autoload_externally=+cc_library,+cc_binary
+
+build --conlyopt='-std=gnu11' --cxxopt='-std=c++17'
+build --host_cxxopt='-std=c++17'

.bazelversion

@@ -0,0 +1 @@
+9.0.0

.bazelversion.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2026 Yuao Ma
+
+SPDX-License-Identifier: Apache-2.0

.github/workflows/bazel.yml

@@ -0,0 +1,64 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: "Test Bazel Build"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      BAZEL: bazelisk-linux-amd64
+      BUILDIFIER: buildifier-linux-amd64
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          submodules: recursive
+
+      - name: Mount bazel cache
+        uses: actions/cache@v5
+        with:
+          # See https://docs.bazel.build/versions/master/output_directories.html
+          path: "~/.cache/bazel"
+          # Create a new cache entry whenever Bazel files change.
+          # See https://docs.github.com/en/actions/guides/caching-dependencies-to-speed-up-workflows
+          key: bazel-${{ runner.os }}-build-${{ hashFiles('**/*.bzl', '**/*.bazel') }}
+          restore-keys: |
+            bazel-${{ runner.os }}-build-
+
+      - name: Install Buildifier
+        run: |
+          curl -LO "https://github.com/bazelbuild/buildtools/releases/download/v8.5.1/$BUILDIFIER"
+          chmod +x $BUILDIFIER
+          sudo mv $BUILDIFIER /usr/local/bin/buildifier
+
+      - name: Run Buildifier
+        run: |
+          BZL_FILES=$(git ls-files | grep -E 'BUILD.*|\.bzl$|\.bazel$')
+          if ! buildifier --mode=check $BZL_FILES; then
+            echo "::error::Buildifier formatting issues found."
+            echo "::group::Buildifier Diff"
+            buildifier --mode=diff $BZL_FILES
+            echo "::endgroup::"
+            exit 1
+          else
+            echo "All files are formatted correctly."
+          fi
+
+      - name: Install bazelisk
+        run: |
+          curl -LO "https://github.com/bazelbuild/bazelisk/releases/download/v1.29.0/$BAZEL"
+          chmod +x $BAZEL
+          sudo mv $BAZEL /usr/local/bin/bazel
+
+      - name: Build
+        run: bazel build //targets/simple_switch_grpc:simple_switch_grpc
+
+      - name: Test
+        run: bazel test //targets/simple_switch_grpc/tests/...

BUILD.bazel

@@ -0,0 +1,70 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+load("@package_metadata//licenses:defs.bzl", "license")
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+
+package(
+    default_applicable_licenses = ["//:license"],
+    default_visibility = ["//visibility:public"],
+)
+
+license(
+    name = "license",
+    kind = "@package_metadata//licenses/spdx:Apache-2.0",
+    text = "LICENSE",
+)
+
+exports_files([
+    "LICENSE",
+    "VERSION",
+])
+
+expand_template(
+    name = "config_h",
+    out = "include/bm/config.h",
+    substitutions = {
+        # disabled
+        "#cmakedefine BM_DEBUG_ON @BM_DEBUG_ON@": "/* #undef BM_DEBUG_ON */",
+        "#cmakedefine BM_ELOG_ON @BM_ELOG_ON@": "/* #undef BM_ELOG_ON */",
+        # enabled
+        "#cmakedefine BM_ENABLE_MODULES @BM_ENABLE_MODULES@": "#define BM_ENABLE_MODULES 1",
+        "#cmakedefine BM_HAVE_ALGORITHM @BM_HAVE_ALGORITHM@": "#define BM_HAVE_ALGORITHM 1",
+        "#cmakedefine BM_HAVE_ARRAY @BM_HAVE_ARRAY@": "#define BM_HAVE_ARRAY 1",
+        "#cmakedefine BM_HAVE_CASSERT @BM_HAVE_CASSERT@": "#define BM_HAVE_CASSERT 1",
+        "#cmakedefine BM_HAVE_CMATH @BM_HAVE_CMATH@": "#define BM_HAVE_CMATH 1",
+        "#cmakedefine BM_HAVE_CSTDIO @BM_HAVE_CSTDIO@": "#define BM_HAVE_CSTDIO 1",
+        "#cmakedefine BM_HAVE_CTIME @BM_HAVE_CTIME@": "#define BM_HAVE_CTIME 1",
+        "#cmakedefine BM_HAVE_DLFCN_H @BM_HAVE_DLFCN_H@": "#define BM_HAVE_DLFCN_H 1",
+        "#cmakedefine BM_HAVE_DLOPEN @BM_HAVE_DLOPEN@": "#define BM_HAVE_DLOPEN 1",
+        "#cmakedefine BM_HAVE_QUEUE @BM_HAVE_QUEUE@": "#define BM_HAVE_QUEUE 1",
+        "#cmakedefine BM_HAVE_STRING @BM_HAVE_STRING@": "#define BM_HAVE_STRING 1",
+        "#cmakedefine BM_HAVE_SYS_STAT_H @BM_HAVE_SYS_STAT_H@": "#define BM_HAVE_SYS_STAT_H 1",
+        "#cmakedefine BM_HAVE_SYS_TYPES_H @BM_HAVE_SYS_TYPES_H@": "#define BM_HAVE_SYS_TYPES_H 1",
+        # disabled
+        "#cmakedefine BM_HAVE_THRIFT_STDCXX_H @BM_HAVE_THRIFT_STDCXX_H@": "/* #undef BM_HAVE_THRIFT_STDCXX_H */",
+        # enabled
+        "#cmakedefine BM_HAVE_TUPLE @BM_HAVE_TUPLE@": "#define BM_HAVE_TUPLE 1",
+        "#cmakedefine BM_HAVE_UNISTD_H @BM_HAVE_UNISTD_H@": "#define BM_HAVE_UNISTD_H 1",
+        "#cmakedefine BM_HAVE_UNORDERED_MAP @BM_HAVE_UNORDERED_MAP@": "#define BM_HAVE_UNORDERED_MAP 1",
+        "#cmakedefine BM_HAVE_UTILITY @BM_HAVE_UTILITY@": "#define BM_HAVE_UTILITY 1",
+        "#cmakedefine BM_HAVE_VECTOR @BM_HAVE_VECTOR@": "#define BM_HAVE_VECTOR 1",
+        "#cmakedefine BM_LOG_DEBUG_ON @BM_LOG_DEBUG_ON@": "#define BM_LOG_DEBUG_ON 1",
+        "#cmakedefine BM_LOG_TRACE_ON @BM_LOG_TRACE_ON@": "#define BM_LOG_TRACE_ON 1",
+        # disabled
+        "#cmakedefine BM_NANOMSG_ON @BM_NANOMSG_ON@": "/* #undef BM_NANOMSG_ON */",
+        "#cmakedefine BM_THRIFT_ON @BM_THRIFT_ON@": "/* #undef BM_THRIFT_ON */",
+        "#cmakedefine BM_THRIFT_VERSION @BM_THRIFT_VERSION@": "/* #undef BM_THRIFT_VERSION */",
+        # enabled
+        "#cmakedefine BM_WP4_16_STACKS @BM_WP4_16_STACKS@": "#define BM_WP4_16_STACKS 1",
+    },
+    template = "include/bm/config.h.in",
+)
+
+cc_library(
+    name = "bm_headers",
+    hdrs = glob(["include/bm/**/*.h"]) + [":config_h"],
+    includes = ["include"],
+)

MODULE.bazel

@@ -0,0 +1,37 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+module(
+    name = "behavioral_model",
+    version = "1.15.3",
+    bazel_compatibility = [">=7.0.0"],
+)
+
+bazel_dep(name = "bazel_skylib", version = "1.9.0")
+bazel_dep(name = "boost.container", version = "1.90.0.bcr.1")
+bazel_dep(name = "boost.container_hash", version = "1.90.0.bcr.1")
+bazel_dep(name = "boost.multiprecision", version = "1.90.0.bcr.1")
+bazel_dep(name = "boost.program_options", version = "1.90.0.bcr.1")
+bazel_dep(name = "boost.thread", version = "1.90.0.bcr.1")
+bazel_dep(name = "boringssl", version = "0.20260508.0")
+bazel_dep(name = "com_github_p4lang_pi", version = "head")
+bazel_dep(name = "gmp", version = "6.3.0.bcr.1")
+bazel_dep(name = "googleapis", version = "0.0.0-20260130-c0fcb356", repo_name = "com_google_googleapis")
+bazel_dep(name = "grpc", version = "1.76.0", repo_name = "com_github_grpc_grpc")
+bazel_dep(name = "jsoncpp", version = "1.9.6.bcr.2")
+bazel_dep(name = "libpcap", version = "1.10.5.bcr.3")
+bazel_dep(name = "p4runtime", version = "1.5.0.bcr.1", repo_name = "com_github_p4lang_p4runtime")
+bazel_dep(name = "package_metadata", version = "0.0.10")
+bazel_dep(name = "protobuf", version = "33.5", repo_name = "com_google_protobuf")
+bazel_dep(name = "rules_cc", version = "0.2.17")
+bazel_dep(name = "xxhash", version = "0.8.3.bcr.1")
+
+bazel_dep(name = "googletest", version = "1.17.0.bcr.2", dev_dependency = True)
+
+git_override(
+    module_name = "com_github_p4lang_pi",
+    commit = "0aa6c69140045b8a74575dbb7818664dd1066504",
+    init_submodules = True,
+    remote = "https://github.com/p4lang/PI.git",
+)

PI/BUILD.bazel

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+cc_library(
+    name = "bmpi",
+    srcs = glob([
+        "src/*.cpp",
+        "src/*.h",
+    ]),
+    hdrs = ["bm/PI/pi.h"],
+    includes = ["."],
+    local_defines = ["WITH_SIMPLE_SWITCH"],
+    deps = [
+        "//:bm_headers",
+        "//targets/simple_switch:simpleswitch",
+        "@com_github_p4lang_pi//:pi",
+    ],
+    alwayslink = True,
+)

services/BUILD.bazel

@@ -0,0 +1,30 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@com_github_grpc_grpc//bazel:cc_grpc_library.bzl", "cc_grpc_library")
+load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
+load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+proto_library(
+    name = "dataplane_interface_proto",
+    srcs = ["p4/bm/dataplane_interface.proto"],
+    strip_import_prefix = "",
+)
+
+cc_proto_library(
+    name = "dataplane_interface_cc_proto",
+    deps = [":dataplane_interface_proto"],
+)
+
+cc_grpc_library(
+    name = "bm_grpc_dataplane",
+    srcs = [":dataplane_interface_proto"],
+    grpc_only = True,
+    deps = [":dataplane_interface_cc_proto"],
+)

src/BMI/BUILD.bazel

@@ -0,0 +1,25 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+cc_library(
+    name = "bmi",
+    srcs = [
+        "bmi_interface.c",
+        "bmi_port.c",
+    ],
+    hdrs = [
+        "BMI/bmi_port.h",
+        "bmi_interface.h",
+    ],
+    includes = ["."],
+    local_defines = ["WITH_PCAP_FIX"],
+    deps = ["@libpcap"],
+)

src/bm_sim/BUILD.bazel

@@ -0,0 +1,51 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+genrule(
+    name = "version_cpp",
+    srcs = [
+        "version.cpp.in",
+        "//:VERSION",
+    ],
+    outs = ["version.cpp"],
+    cmd = "sed \"s/@BM_VERSION@/$$(cat $(rootpath //:VERSION))/\" $(location version.cpp.in) > $@",
+)
+
+cc_library(
+    name = "bmsim",
+    srcs = glob(
+        [
+            "*.cpp",
+            "*.c",
+            "*.h",
+            "core/*.cpp",
+        ],
+        exclude = ["md5.c"],
+    ) + [":version_cpp"],
+    copts = ["-Isrc/bm_sim"],
+    defines = ["HAVE_OPENSSL"],
+    linkopts = ["-ldl"],
+    deps = [
+        "//:bm_headers",
+        "//src/BMI:bmi",
+        "//third_party:spdlog",
+        "@boost.container",
+        "@boost.container_hash",
+        "@boost.multiprecision",
+        "@boost.program_options",
+        "@boost.thread",
+        "@boringssl//:crypto",
+        "@gmp",
+        "@jsoncpp",
+        "@libpcap",
+        "@xxhash",
+    ],
+)

targets/simple_switch/BUILD.bazel

@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: 2026 Yuao Ma
+#
+# SPDX-License-Identifier: Apache-2.0
+
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+cc_library(
+    name = "simpleswitch",
+    srcs = [
+        "primitives.cpp",
+        "simple_switch.cpp",
+    ],
+    hdrs = [
+        "register_access.h",
+        "simple_switch.h",
+    ],
+    includes = ["."],
+    deps = [
+        "//:bm_headers",
+        "//src/BMI:bmi",
+        "//src/bm_sim:bmsim",
+        "@jsoncpp",
+    ],
+)