started Thrift IDL for runtime configuration

thrift_src/Makefile

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+runtime:
+	thrift -r --gen cpp runtime.thrift

thrift_src/runtime.thrift

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+namespace cpp bm_runtime
+
+typedef i32 EntryHandle
+typedef list<binary> ActionData
+
+exception InvalidTableOperation {
+  1: i32 what
+}
+
+service Runtime {
+  EntryHandle bm_table_add_exact_match_entry(
+    1:string table_name,
+    2:string action_name,
+    3:binary key,
+    4:ActionData action_data
+  ) throws (1:InvalidTableOperation ouch),
+
+  EntryHandle bm_table_add_lpm_entry(
+    1:string table_name,
+    2:string action_name,
+    3:binary key,
+    4:i32 prefix_length,
+    5:ActionData action_data
+  ) throws (1:InvalidTableOperation ouch),
+
+  EntryHandle bm_table_add_ternary_match_entry(
+    1:string table_name,
+    2:string action_name,
+    3:binary key,
+    4:binary mask,
+    5:i32 priority,
+    6:ActionData action_data
+  ) throws (1:InvalidTableOperation ouch),
+
+  void bm_set_default_action(
+    1:string table_name,
+    2:string action_name,
+    3:ActionData action_data
+  ) throws (1:InvalidTableOperation ouch)
+
+  void bm_table_delete_entry(
+    1:string table_name,
+    2:EntryHandle entry_handle
+  ) throws (1:InvalidTableOperation ouch)
+}