[Celestica] Leh800bcls: Support NPU-specific yamlConfig to allow differing polarity settings on multi-NPU platforms

Author: gang-tao

fboss/agent/platforms/sai/SaiBcmPlatform.cpp

@@ -25,17 +25,35 @@ std::string SaiBcmPlatform::getHwConfig() {
   if (getAsic()->isSupported(HwAsic::Feature::HSDK)) {
     std::string yamlConfig;
     try {
-      yamlConfig = config()
-                       ->thrift.platform()
-                       ->chip()
-                       ->get_asicConfig()
-                       .common()
-                       ->get_yamlConfig();
-    } catch (const std::exception&) {
+      auto asicConfig = config()->thrift.platform()->chip()->get_asicConfig();
+      if (asicConfig.npuEntries()) {
+        int16_t switchIndex = getAsic()->getSwitchIndex();
+        XLOG(INFO)
+            << "Loading HSDK config: found npuEntries, current switchIndex="
+            << switchIndex;
+        auto& npuEntries = asicConfig.npuEntries().value();
+        auto npuEntry = npuEntries.find(switchIndex);
+        if (npuEntry != npuEntries.end() &&
+            npuEntry->second.getType() ==
+                cfg::AsicConfigEntry::Type::yamlConfig) {
+          XLOG(INFO) << "Loading NPU-specific yamlConfig for switchIndex="
+                     << switchIndex;
+          yamlConfig = npuEntry->second.get_yamlConfig();
+        } else {
+          XLOG(INFO) << "No NPU-specific yamlConfig found for switchIndex="
+                     << switchIndex << ", falling back to common config";
+        }
+      }
+      if (yamlConfig.empty()) {
+        yamlConfig = asicConfig.common()->get_yamlConfig();
+      }
+    } catch (const std::exception& e) {
       /*
        * (TODO): Once asic config v2 is rolled out to the fleet, we
        * should remove this fallback and always use the config v2
        */
+      XLOG(INFO) << "Exception in SaiBcmPlatform::getHwConfig: " << e.what()
+                 << ", falling back to bcm.yamlConfig()";
       yamlConfig =
           *(config()->thrift.platform()->chip()->get_bcm().yamlConfig());
     }