[Nexthop][NPI] "asic_config_v3" part 4 - Add platform configurations

cmake/AsicConfigV3ConfigCli.cmake

@@ -0,0 +1,38 @@
+# CMake to build libraries and binaries in fboss/lib/asic_config_v3
+# Data-driven ASIC config generation
+
+include(FBPythonBinary)
+
+set(
+    ASIC_CONFIG_V3_PY_SRCS
+    "fboss/lib/asic_config_v3/__init__.py"
+    "fboss/lib/asic_config_v3/base_generator.py"
+    "fboss/lib/asic_config_v3/gen.py"
+    "fboss/lib/asic_config_v3/generators/__init__.py"
+    "fboss/lib/asic_config_v3/generators/broadcom_xgs_generator.py"
+    "fboss/lib/platform_mapping_v2/asic_vendor_config.py"
+    "fboss/lib/platform_mapping_v2/gen.py"
+    "fboss/lib/platform_mapping_v2/helpers.py"
+    "fboss/lib/platform_mapping_v2/platform_mapping_v2.py"
+    "fboss/lib/platform_mapping_v2/port_profile_mapping.py"
+    "fboss/lib/platform_mapping_v2/profile_settings.py"
+    "fboss/lib/platform_mapping_v2/read_files_utils.py"
+    "fboss/lib/platform_mapping_v2/si_settings.py"
+    "fboss/lib/platform_mapping_v2/static_mapping.py"
+)
+
+add_fb_thrift_python_executable(
+    fboss-asic-config-v3-gen
+    MAIN_MODULE fboss.lib.asic_config_v3.gen:generate_all_asic_configs
+    SOURCES ${ASIC_CONFIG_V3_PY_SRCS}
+    DEPENDS
+        platform_config_python
+        switch_config_python
+        transceiver_python
+        phy_python
+        platform_mapping_config_python
+        fboss_common_python
+        python-pyyaml::python-pyyaml
+)
+
+install_fb_python_executable(fboss-asic-config-v3-gen)

fboss/lib/asic_config_v2/run-helper.sh

@@ -1,2 +1,5 @@
 #!/bin/bash
-python3 fboss/lib/oss/run-helper.py --target fboss-asic-config-gen "$@"
+python3 fboss/lib/oss/run-helper.py \
+  --target fboss-asic-config-gen.GEN_PY_EXE \
+  --extra-cmake-defines='{"RANGE_V3_TESTS": "OFF"}' \
+  "$@"

fboss/lib/asic_config_v3/__init__.py

@@ -0,0 +1 @@
+# pyre-strict

fboss/lib/asic_config_v3/base_generator.py

@@ -0,0 +1,82 @@
+# pyre-strict
+
+import copy
+import os
+from abc import ABC, abstractmethod
+from typing import Any
+
+# Resolve config paths relative to the repo root rather than this file so the
+# generator can run from the same checkout layout the bundled getdeps build
+# expects.
+_FBOSS_DIR: str = os.getcwd() + "/fboss"
+MODULE_DIR: str = f"{_FBOSS_DIR}/lib/asic_config_v3"
+
+
+def _deep_merge(base: dict[str, Any], override: dict[str, Any]) -> dict[str, Any]:
+    """Recursively merge ``override`` on top of ``base``.
+
+    Dict values present in both are merged recursively. For any other value
+    type (scalars, lists, or a type mismatch between the two sides) the
+    override replaces the base entry outright. Returns a new dict; the inputs
+    are not mutated.
+    """
+    result = copy.deepcopy(base)
+    for key, ov_value in override.items():
+        if (
+            key in result
+            and isinstance(result[key], dict)
+            and isinstance(ov_value, dict)
+        ):
+            result[key] = _deep_merge(result[key], ov_value)
+        else:
+            result[key] = copy.deepcopy(ov_value)
+    return result
+
+
+class BaseAsicConfigGenerator(ABC):
+    """Abstract base class for ASIC config generators.
+
+    Subclasses implement ``generate()`` to produce vendor-specific output
+    such as YAML or JSON.
+    """
+
+    def __init__(
+        self,
+        platform_name: str,
+        variant: str,
+        platform_config: dict[str, Any],
+    ) -> None:
+        self.platform_name = platform_name
+        self.variant = variant
+        self.platform_config = platform_config
+
+        vendor = platform_config.get("vendor")
+        asic = platform_config.get("asic")
+        if not vendor:
+            raise ValueError("platform asic_config.json must define 'vendor'")
+        if not asic:
+            raise ValueError("platform asic_config.json must define 'asic'")
+        self.asic_vendor: str = vendor
+        self.asic_name: str = asic
+
+        # The platform JSON may declare a top-level ``defaults`` block inherited
+        # by every variant. The effective variant config is produced by deep-
+        # merging the variant-specific entries on top of ``defaults``. Dict
+        # values are merged recursively; scalars and lists are replaced.
+        defaults = platform_config.get("defaults", {})
+        variant_override = platform_config.get("variants", {}).get(variant, {})
+        self.variant_config: dict[str, Any] = _deep_merge(defaults, variant_override)
+        self.asic_config_params: dict[str, Any] = self.variant_config.get(
+            "asic_config_params", {}
+        )
+
+    @abstractmethod
+    def generate(self) -> str:
+        """Generate the complete ASIC config and return it as a string."""
+        ...
+
+    @property
+    @abstractmethod
+    def output_extension(self) -> str:
+        """File extension for the generated output (e.g. '.yml' or '.json')."""
+        ...

fboss/lib/asic_config_v3/common/ocp_sai_common.json

@@ -0,0 +1,4 @@
+{
+  "_comment": "OCP SAI standard settings (vendor-agnostic).",
+  "global": {}
+}

fboss/lib/asic_config_v3/gen.py

@@ -0,0 +1,115 @@
+# pyre-strict
+
+import json
+import os
+import sys
+
+from fboss.lib.asic_config_v3.base_generator import (
+    BaseAsicConfigGenerator,
+    MODULE_DIR,
+)
+from fboss.lib.asic_config_v3.generators.broadcom_xgs_generator import (
+    BroadcomXgsGenerator,
+)
+
+OUTPUT_DIR: str = f"{MODULE_DIR}/generated_asic_configs"
+
+# Add a new (vendor, asic) entry when bringing up a new ASIC family.
+_GENERATOR_REGISTRY: dict[tuple[str, str], type[BaseAsicConfigGenerator]] = {
+    ("broadcom", "tomahawk5"): BroadcomXgsGenerator,
+    ("broadcom", "tomahawk6"): BroadcomXgsGenerator,
+}
+
+
+def get_generator(
+    platform_name: str, variant: str, platform_config: dict
+) -> BaseAsicConfigGenerator:
+    """Instantiate the correct generator based on vendor and ASIC."""
+    vendor = platform_config["vendor"]
+    asic = platform_config["asic"]
+    key = (vendor, asic)
+    generator_cls = _GENERATOR_REGISTRY.get(key)
+    if not generator_cls:
+        raise ValueError(f"No generator registered for vendor={vendor}, asic={asic}")
+    return generator_cls(platform_name, variant, platform_config)
+
+
+def discover_platforms() -> dict:
+    """Return a mapping of platform name to platform config.
+
+    Discovered by scanning ``platforms/*/asic_config.json``.
+    """
+    platforms_dir = os.path.join(MODULE_DIR, "platforms")
+    platforms = {}
+
+    if not os.path.exists(platforms_dir):
+        return platforms
+
+    for platform_name in os.listdir(platforms_dir):
+        platform_path = os.path.join(platforms_dir, platform_name)
+        if not os.path.isdir(platform_path):
+            continue
+
+        config_path = os.path.join(platform_path, "asic_config.json")
+        if not os.path.exists(config_path):
+            continue
+
+        with open(config_path) as f:
+            platform_config = json.load(f)
+            platforms[platform_name] = platform_config
+
+    return platforms
+
+
+def generate_all_asic_configs() -> None:
+    """Generate ASIC configs for every discovered platform and variant."""
+    os.makedirs(OUTPUT_DIR, exist_ok=True)
+
+    for filename in os.listdir(OUTPUT_DIR):
+        if filename.endswith((".json", ".yml")):
+            os.remove(os.path.join(OUTPUT_DIR, filename))
+
+    platforms = discover_platforms()
+
+    for platform_name, platform_config in platforms.items():
+        vendor = platform_config.get("vendor", "")
+        asic = platform_config.get("asic", "")
+
+        if (vendor, asic) not in _GENERATOR_REGISTRY:
+            print(
+                f"Skipping {platform_name} (no generator for vendor={vendor}, asic={asic})",
+                file=sys.stderr,
+            )
+            continue
+
+        variants = platform_config.get("variants", {})
+
+        for variant_name in variants:
+            print(
+                f"Generating ASIC config for {platform_name}/{variant_name}...",
+                file=sys.stderr,
+            )
+
+            try:
+                generator = get_generator(platform_name, variant_name, platform_config)
+                output = generator.generate()
+
+                output_filename = (
+                    f"{platform_name}_{variant_name}{generator.output_extension}"
+                )
+                output_path = os.path.join(OUTPUT_DIR, output_filename)
+
+                print(f"Writing to {output_path}", file=sys.stderr)
+                with open(output_path, "w", encoding="utf-8") as f:
+                    f.write(output)
+
+            except Exception as e:
+                print(
+                    f"Error generating config for {platform_name}/{variant_name}: {e}",
+                    file=sys.stderr,
+                )
+                raise
+
+
+if __name__ == "__main__":
+    generate_all_asic_configs()

fboss/lib/asic_config_v3/generators/__init__.py

@@ -0,0 +1 @@
+# pyre-strict