diff --git a/src/alert-debuglog.c b/src/alert-debuglog.c
index 85ce294150..95d29b2c65 100644
--- a/src/alert-debuglog.c
+++ b/src/alert-debuglog.c
@@ -481,7 +481,15 @@ static int AlertDebugLogLogger(ThreadVars *tv, void *thread_data, const Packet *
 
 void AlertDebugLogRegister(void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = AlertDebugLogLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = AlertDebugLogCondition,
+        .ThreadInitFunc = AlertDebugLogThreadInit,
+        .ThreadDeinitFunc = AlertDebugLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketModule(LOGGER_ALERT_DEBUG, MODULE_NAME, "alert-debug", AlertDebugLogInitCtx,
-            AlertDebugLogLogger, AlertDebugLogCondition, AlertDebugLogThreadInit,
-            AlertDebugLogThreadDeinit);
+            &output_logger_functions);
 }
diff --git a/src/alert-fastlog.c b/src/alert-fastlog.c
index 7f43de4bef..8ced31debd 100644
--- a/src/alert-fastlog.c
+++ b/src/alert-fastlog.c
@@ -76,9 +76,17 @@ int AlertFastLogger(ThreadVars *tv, void *data, const Packet *p);
 
 void AlertFastLogRegister(void)
 {
-    OutputRegisterPacketModule(LOGGER_ALERT_FAST, MODULE_NAME, "fast", AlertFastLogInitCtx,
-            AlertFastLogger, AlertFastLogCondition, AlertFastLogThreadInit,
-            AlertFastLogThreadDeinit);
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = AlertFastLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = AlertFastLogCondition,
+        .ThreadInitFunc = AlertFastLogThreadInit,
+        .ThreadDeinitFunc = AlertFastLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
+    OutputRegisterPacketModule(
+            LOGGER_ALERT_FAST, MODULE_NAME, "fast", AlertFastLogInitCtx, &output_logger_functions);
     AlertFastLogRegisterTests();
 }
 
diff --git a/src/alert-syslog.c b/src/alert-syslog.c
index 016e633493..f22f650105 100644
--- a/src/alert-syslog.c
+++ b/src/alert-syslog.c
@@ -384,8 +384,15 @@ static int AlertSyslogLogger(ThreadVars *tv, void *thread_data, const Packet *p)
 void AlertSyslogRegister (void)
 {
 #ifndef OS_WIN32
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = AlertSyslogLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = AlertSyslogCondition,
+        .ThreadInitFunc = AlertSyslogThreadInit,
+        .ThreadDeinitFunc = AlertSyslogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
     OutputRegisterPacketModule(LOGGER_ALERT_SYSLOG, MODULE_NAME, "syslog", AlertSyslogInitCtx,
-            AlertSyslogLogger, AlertSyslogCondition, AlertSyslogThreadInit,
-            AlertSyslogThreadDeinit);
+            &output_logger_functions);
 #endif /* !OS_WIN32 */
 }
diff --git a/src/log-pcap.c b/src/log-pcap.c
index a930d98fa3..de506ee255 100644
--- a/src/log-pcap.c
+++ b/src/log-pcap.c
@@ -209,8 +209,16 @@ static bool PcapLogCondition(ThreadVars *, void *, const Packet *);
 
 void PcapLogRegister(void)
 {
-    OutputRegisterPacketModule(LOGGER_PCAP, MODULE_NAME, "pcap-log", PcapLogInitCtx, PcapLog,
-            PcapLogCondition, PcapLogDataInit, PcapLogDataDeinit);
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = PcapLog,
+        .FlushFunc = NULL,
+        .ConditionFunc = PcapLogCondition,
+        .ThreadInitFunc = PcapLogDataInit,
+        .ThreadDeinitFunc = PcapLogDataDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+    OutputRegisterPacketModule(
+            LOGGER_PCAP, MODULE_NAME, "pcap-log", PcapLogInitCtx, &output_logger_functions);
     PcapLogProfileSetup();
     SC_ATOMIC_INIT(thread_cnt);
     SC_ATOMIC_SET(thread_cnt, 1); /* first id is 1 */
diff --git a/src/output-eve-stream.c b/src/output-eve-stream.c
index 3059f25181..15d262b435 100644
--- a/src/output-eve-stream.c
+++ b/src/output-eve-stream.c
@@ -452,7 +452,15 @@ static bool EveStreamLogCondition(ThreadVars *tv, void *data, const Packet *p)
 
 void EveStreamLogRegister(void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = EveStreamLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = EveStreamLogCondition,
+        .ThreadInitFunc = EveStreamLogThreadInit,
+        .ThreadDeinitFunc = EveStreamLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_STREAM, "eve-log", MODULE_NAME, "eve-log.stream",
-            EveStreamLogInitCtxSub, EveStreamLogger, EveStreamLogCondition, EveStreamLogThreadInit,
-            EveStreamLogThreadDeinit);
+            EveStreamLogInitCtxSub, &output_logger_functions);
 }
diff --git a/src/output-json-alert.c b/src/output-json-alert.c
index c5c15d32b5..419a1d2b42 100644
--- a/src/output-json-alert.c
+++ b/src/output-json-alert.c
@@ -1065,7 +1065,15 @@ error:
 
 void JsonAlertLogRegister (void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonAlertLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonAlertLogCondition,
+        .ThreadInitFunc = JsonAlertLogThreadInit,
+        .ThreadDeinitFunc = JsonAlertLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_ALERT, "eve-log", MODULE_NAME, "eve-log.alert",
-            JsonAlertLogInitCtxSub, JsonAlertLogger, JsonAlertLogCondition, JsonAlertLogThreadInit,
-            JsonAlertLogThreadDeinit);
+            JsonAlertLogInitCtxSub, &output_logger_functions);
 }
diff --git a/src/output-json-anomaly.c b/src/output-json-anomaly.c
index 00f82fa368..cd9e5dc068 100644
--- a/src/output-json-anomaly.c
+++ b/src/output-json-anomaly.c
@@ -449,9 +449,17 @@ static OutputInitResult JsonAnomalyLogInitCtxSub(ConfNode *conf, OutputCtx *pare
 
 void JsonAnomalyLogRegister (void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonAnomalyLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonAnomalyLogCondition,
+        .ThreadInitFunc = JsonAnomalyLogThreadInit,
+        .ThreadDeinitFunc = JsonAnomalyLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_ANOMALY, "eve-log", MODULE_NAME, "eve-log.anomaly",
-            JsonAnomalyLogInitCtxSub, JsonAnomalyLogger, JsonAnomalyLogCondition,
-            JsonAnomalyLogThreadInit, JsonAnomalyLogThreadDeinit);
+            JsonAnomalyLogInitCtxSub, &output_logger_functions);
 
     OutputRegisterTxSubModule(LOGGER_JSON_ANOMALY, "eve-log", MODULE_NAME, "eve-log.anomaly",
             JsonAnomalyLogInitCtxHelper, ALPROTO_UNKNOWN, JsonAnomalyTxLogger,
diff --git a/src/output-json-arp.c b/src/output-json-arp.c
index 87a80d8cdb..804e355135 100644
--- a/src/output-json-arp.c
+++ b/src/output-json-arp.c
@@ -103,9 +103,17 @@ static bool JsonArpLogCondition(ThreadVars *tv, void *thread_data, const Packet
 
 void JsonArpLogRegister(void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonArpLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonArpLogCondition,
+        .ThreadInitFunc = JsonLogThreadInit,
+        .ThreadDeinitFunc = JsonLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_ARP, "eve-log", "JsonArpLog", "eve-log.arp",
-            OutputJsonLogInitSub, JsonArpLogger, JsonArpLogCondition, JsonLogThreadInit,
-            JsonLogThreadDeinit);
+            OutputJsonLogInitSub, &output_logger_functions);
 
     SCLogDebug("ARP JSON logger registered.");
 }
diff --git a/src/output-json-drop.c b/src/output-json-drop.c
index 1ac27a209d..29ead13e07 100644
--- a/src/output-json-drop.c
+++ b/src/output-json-drop.c
@@ -390,7 +390,15 @@ static bool JsonDropLogCondition(ThreadVars *tv, void *data, const Packet *p)
 
 void JsonDropLogRegister (void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonDropLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonDropLogCondition,
+        .ThreadInitFunc = JsonDropLogThreadInit,
+        .ThreadDeinitFunc = JsonDropLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_DROP, "eve-log", MODULE_NAME, "eve-log.drop",
-            JsonDropLogInitCtxSub, JsonDropLogger, JsonDropLogCondition, JsonDropLogThreadInit,
-            JsonDropLogThreadDeinit);
+            JsonDropLogInitCtxSub, &output_logger_functions);
 }
diff --git a/src/output-json-frame.c b/src/output-json-frame.c
index 3fc875b051..dfd895b8ab 100644
--- a/src/output-json-frame.c
+++ b/src/output-json-frame.c
@@ -560,7 +560,14 @@ error:
 
 void JsonFrameLogRegister(void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonFrameLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonFrameLogCondition,
+        .ThreadInitFunc = JsonFrameLogThreadInit,
+        .ThreadDeinitFunc = JsonFrameLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
     OutputRegisterPacketSubModule(LOGGER_JSON_FRAME, "eve-log", MODULE_NAME, "eve-log.frame",
-            JsonFrameLogInitCtxSub, JsonFrameLogger, JsonFrameLogCondition, JsonFrameLogThreadInit,
-            JsonFrameLogThreadDeinit);
+            JsonFrameLogInitCtxSub, &output_logger_functions);
 }
diff --git a/src/output-json-metadata.c b/src/output-json-metadata.c
index 2602e4b9b3..a87d735839 100644
--- a/src/output-json-metadata.c
+++ b/src/output-json-metadata.c
@@ -94,12 +94,19 @@ static bool JsonMetadataLogCondition(ThreadVars *tv, void *data, const Packet *p
 
 void JsonMetadataLogRegister (void)
 {
+    OutputPacketLoggerFunctions output_logger_functions = {
+        .LogFunc = JsonMetadataLogger,
+        .FlushFunc = NULL,
+        .ConditionFunc = JsonMetadataLogCondition,
+        .ThreadInitFunc = JsonLogThreadInit,
+        .ThreadDeinitFunc = JsonLogThreadDeinit,
+        .ThreadExitPrintStatsFunc = NULL,
+    };
+
     OutputRegisterPacketSubModule(LOGGER_JSON_METADATA, "eve-log", MODULE_NAME, "eve-log.metadata",
-            OutputJsonLogInitSub, JsonMetadataLogger, JsonMetadataLogCondition, JsonLogThreadInit,
-            JsonLogThreadDeinit);
+            OutputJsonLogInitSub, &output_logger_functions);
 
     /* Kept for compatibility. */
     OutputRegisterPacketSubModule(LOGGER_JSON_METADATA, "eve-log", MODULE_NAME, "eve-log.vars",
-            OutputJsonLogInitSub, JsonMetadataLogger, JsonMetadataLogCondition, JsonLogThreadInit,
-            JsonLogThreadDeinit);
+            OutputJsonLogInitSub, &output_logger_functions);
 }
diff --git a/src/output.c b/src/output.c
index b86e3d483c..261fa9a5a7 100644
--- a/src/output.c
+++ b/src/output.c
@@ -85,6 +85,7 @@
 
 typedef struct RootLogger_ {
     OutputLogFunc LogFunc;
+    OutputFlushFunc FlushFunc;
     ThreadInitFunc ThreadInit;
     ThreadDeinitFunc ThreadDeinit;
     OutputGetActiveCountFunc ActiveCntFunc;
@@ -167,10 +168,10 @@ error:
  * \retval Returns 0 on success, -1 on failure.
  */
 void OutputRegisterPacketModule(LoggerId id, const char *name, const char *conf_name,
-        OutputInitFunc InitFunc, PacketLogger PacketLogFunc, PacketLogCondition PacketConditionFunc,
-        ThreadInitFunc ThreadInit, ThreadDeinitFunc ThreadDeinit)
+        OutputInitFunc InitFunc, OutputPacketLoggerFunctions *output_module_functions)
 {
-    if (unlikely(PacketLogFunc == NULL || PacketConditionFunc == NULL)) {
+    if (unlikely(output_module_functions->LogFunc == NULL ||
+                 output_module_functions->ConditionFunc == NULL)) {
         goto error;
     }
 
@@ -183,10 +184,11 @@ void OutputRegisterPacketModule(LoggerId id, const char *name, const char *conf_
     module->name = name;
     module->conf_name = conf_name;
     module->InitFunc = InitFunc;
-    module->PacketLogFunc = PacketLogFunc;
-    module->PacketConditionFunc = PacketConditionFunc;
-    module->ThreadInit = ThreadInit;
-    module->ThreadDeinit = ThreadDeinit;
+    module->PacketLogFunc = output_module_functions->LogFunc;
+    module->PacketFlushFunc = output_module_functions->FlushFunc;
+    module->PacketConditionFunc = output_module_functions->ConditionFunc;
+    module->ThreadInit = output_module_functions->ThreadInitFunc;
+    module->ThreadDeinit = output_module_functions->ThreadDeinitFunc;
     TAILQ_INSERT_TAIL(&output_modules, module, entries);
 
     SCLogDebug("Packet logger \"%s\" registered.", name);
@@ -204,11 +206,11 @@ error:
  * \retval Returns 0 on success, -1 on failure.
  */
 void OutputRegisterPacketSubModule(LoggerId id, const char *parent_name, const char *name,
-        const char *conf_name, OutputInitSubFunc InitFunc, PacketLogger PacketLogFunc,
-        PacketLogCondition PacketConditionFunc, ThreadInitFunc ThreadInit,
-        ThreadDeinitFunc ThreadDeinit)
+        const char *conf_name, OutputInitSubFunc InitFunc,
+        OutputPacketLoggerFunctions *output_logger_functions)
 {
-    if (unlikely(PacketLogFunc == NULL || PacketConditionFunc == NULL)) {
+    if (unlikely(output_logger_functions->LogFunc == NULL ||
+                 output_logger_functions->ConditionFunc == NULL)) {
         goto error;
     }
 
@@ -222,10 +224,11 @@ void OutputRegisterPacketSubModule(LoggerId id, const char *parent_name, const c
     module->conf_name = conf_name;
     module->parent_name = parent_name;
     module->InitSubFunc = InitFunc;
-    module->PacketLogFunc = PacketLogFunc;
-    module->PacketConditionFunc = PacketConditionFunc;
-    module->ThreadInit = ThreadInit;
-    module->ThreadDeinit = ThreadDeinit;
+    module->PacketLogFunc = output_logger_functions->LogFunc;
+    module->PacketFlushFunc = output_logger_functions->FlushFunc;
+    module->PacketConditionFunc = output_logger_functions->ConditionFunc;
+    module->ThreadInit = output_logger_functions->ThreadInitFunc;
+    module->ThreadDeinit = output_logger_functions->ThreadDeinitFunc;
     TAILQ_INSERT_TAIL(&output_modules, module, entries);
 
     SCLogDebug("Packet logger \"%s\" registered.", name);
diff --git a/src/output.h b/src/output.h
index 87a05adfbd..728a2310e6 100644
--- a/src/output.h
+++ b/src/output.h
@@ -51,6 +51,7 @@ typedef struct OutputInitResult_ {
 typedef OutputInitResult (*OutputInitFunc)(ConfNode *);
 typedef OutputInitResult (*OutputInitSubFunc)(ConfNode *, OutputCtx *);
 typedef TmEcode (*OutputLogFunc)(ThreadVars *, Packet *, void *);
+typedef TmEcode (*OutputFlushFunc)(ThreadVars *, Packet *, void *);
 typedef uint32_t (*OutputGetActiveCountFunc)(void);
 
 typedef struct OutputModule_ {
@@ -65,6 +66,7 @@ typedef struct OutputModule_ {
     ThreadDeinitFunc ThreadDeinit;
 
     PacketLogger PacketLogFunc;
+    PacketLogger PacketFlushFunc;
     PacketLogCondition PacketConditionFunc;
     TxLogger TxLogFunc;
     TxLoggerCondition TxLogCondition;
@@ -81,17 +83,25 @@ typedef struct OutputModule_ {
     TAILQ_ENTRY(OutputModule_) entries;
 } OutputModule;
 
+/* struct for packet module and packet sub-module registration */
+typedef struct OutputPacketLoggerFunctions_ {
+    PacketLogger LogFunc;
+    PacketLogger FlushFunc;
+    PacketLogCondition ConditionFunc;
+    ThreadInitFunc ThreadInitFunc;
+    ThreadDeinitFunc ThreadDeinitFunc;
+    ThreadExitPrintStatsFunc ThreadExitPrintStatsFunc;
+} OutputPacketLoggerFunctions;
+
 typedef TAILQ_HEAD(OutputModuleList_, OutputModule_) OutputModuleList;
 extern OutputModuleList output_modules;
 
 void OutputRegisterModule(const char *, const char *, OutputInitFunc);
 
 void OutputRegisterPacketModule(LoggerId id, const char *name, const char *conf_name,
-        OutputInitFunc InitFunc, PacketLogger LogFunc, PacketLogCondition ConditionFunc,
-        ThreadInitFunc, ThreadDeinitFunc);
+        OutputInitFunc InitFunc, OutputPacketLoggerFunctions *);
 void OutputRegisterPacketSubModule(LoggerId id, const char *parent_name, const char *name,
-        const char *conf_name, OutputInitSubFunc InitFunc, PacketLogger LogFunc,
-        PacketLogCondition ConditionFunc, ThreadInitFunc ThreadInit, ThreadDeinitFunc ThreadDeinit);
+        const char *conf_name, OutputInitSubFunc InitFunc, OutputPacketLoggerFunctions *);
 
 void OutputRegisterTxModule(LoggerId id, const char *name, const char *conf_name,
         OutputInitFunc InitFunc, AppProto alproto, TxLogger TxLogFunc, ThreadInitFunc ThreadInit,