Add interface to enable Redis pipeline and flush Producer(State)Table (sonic-net#139)

* Add option: redis pipeline

* (comment)

Author: qiluo-msft

lib/inc/sairedis.h

@@ -50,6 +50,24 @@ typedef enum _sai_redis_switch_attr_t
      */
     SAI_REDIS_SWITCH_ATTR_USE_TEMP_VIEW,
 
+    /**
+     * @brief Enable redis pipeline
+     *
+     * @type bool
+     * @flags CREATE_AND_SET
+     * @default false
+     */
+    SAI_REDIS_SWITCH_ATTR_USE_PIPELINE,
+
+    /**
+     * @brief Will flush redis pipeline
+     *
+     * @type bool
+     * @flags CREATE_AND_SET
+     * @default false
+     */
+    SAI_REDIS_SWITCH_ATTR_FLUSH,
+
 } sai_redis_switch_attr_t;
 
 #endif // __SAIREDIS__

lib/src/sai_redis_switch.cpp

@@ -380,6 +380,14 @@ sai_status_t redis_set_switch_attribute(
                 g_useTempView = attr->value.booldata;
                 return SAI_STATUS_SUCCESS;
 
+            case SAI_REDIS_SWITCH_ATTR_USE_PIPELINE:
+                g_asicState->setBuffered(attr->value.booldata);
+                return SAI_STATUS_SUCCESS;
+
+            case SAI_REDIS_SWITCH_ATTR_FLUSH:
+                g_asicState->flush();
+                return SAI_STATUS_SUCCESS;
+
             default:
                 break;
         }