[vslib] Refresh queue pause status (sonic-net#814)

Author: wendani

vslib/inc/SwitchStateBase.h

@@ -149,6 +149,9 @@ namespace saivs
             virtual sai_status_t refresh_macsec_sci_in_ingress_macsec_acl(
                     _In_ sai_object_id_t object_id);
 
+            virtual sai_status_t refresh_queue_pause_status(
+                    _In_ sai_object_id_t object_id);
+
         public:
 
             virtual sai_status_t warm_boot_initialize_objects();

vslib/src/SwitchStateBase.cpp

@@ -2056,6 +2056,24 @@ sai_status_t SwitchStateBase::refresh_macsec_sci_in_ingress_macsec_acl(
     return SAI_STATUS_SUCCESS;
 }
 
+sai_status_t SwitchStateBase::refresh_queue_pause_status(
+        _In_ sai_object_id_t object_id)
+{
+    SWSS_LOG_ENTER();
+
+    // To trigger fake PFC storm on fake Broadcom platform, PFC storm detection
+    // lua requires SAI_QUEUE_ATTR_PAUSE_STATUS field to be present in COUNTERS_DB.
+    // However, the actual value of the attribute does not matter in this regard,
+    // so a dummy one is assigned here.
+    sai_attribute_t attr;
+    attr.id = SAI_QUEUE_ATTR_PAUSE_STATUS;
+    attr.value.booldata = false;
+
+    CHECK_STATUS(set(SAI_OBJECT_TYPE_QUEUE, object_id, &attr));
+
+    return SAI_STATUS_SUCCESS;
+}
+
 // XXX extra work may be needed on GET api if N on list will be > then actual
 
 /*
@@ -2205,6 +2223,11 @@ sai_status_t SwitchStateBase::refresh_read_only(
         return refresh_macsec_sci_in_ingress_macsec_acl(object_id);
     }
 
+    if (meta->objecttype == SAI_OBJECT_TYPE_QUEUE && meta->attrid == SAI_QUEUE_ATTR_PAUSE_STATUS)
+    {
+        return refresh_queue_pause_status(object_id);
+    }
+
     auto mmeta = m_meta.lock();
 
     if (mmeta)