neaten flow q handler code

src/tmqh-flow.c

@@ -19,14 +19,12 @@
  * \file
  *
  * \author Victor Julien <victor@inliniac.net>
+ * \author Anoop Saldanha <anoopsaldanha@gmail.com>
  *
  * Simple output queue handler that makes sure all packets of the same flow
- * are sent to the same queue. This is done by simply hashing the flow's
+ * are sent to the same queue. We support different kind of q handlers.  Have
- * memory address as thats readable from a packet without the need to lock
+ * a look at "autofp-scheduler" conf to further undertsand the various q
- * the flow itself.
+ * handlers we provide.
- *
- * \todo we can also think about a queue handler that takes queue load into
- *       account.
  */
 
 #include "suricata.h"
@@ -50,7 +48,8 @@ void TmqhFlowRegisterTests(void);
 
 TmqhFlowCtx *tmqh_flow_outctx = NULL;
 
-void TmqhFlowRegister (void) {
+void TmqhFlowRegister(void)
+{
     tmqh_table[TMQH_FLOW].name = "flow";
     tmqh_table[TMQH_FLOW].InHandler = TmqhInputFlow;
     tmqh_table[TMQH_FLOW].OutHandlerCtxSetup = TmqhOutputFlowSetupCtx;
@@ -69,8 +68,9 @@ void TmqhFlowRegister (void) {
             SCLogInfo("AutoFP mode using \"Active Packets\" Q Handler");
             tmqh_table[TMQH_FLOW].OutHandler = TmqhOutputFlowActivePackets;
         } else {
-            SCLogError(SC_ERR_INVALID_YAML_CONF_ENTRY, "Invalid entry \"%s\" for "
+            SCLogError(SC_ERR_INVALID_YAML_CONF_ENTRY, "Invalid entry \"%s\" "
-                       "autofp-scheduler in conf.  Killing engine.", scheduler);
+                       "for autofp-scheduler in conf.  Killing engine.",
+                       scheduler);
             exit(EXIT_FAILURE);
         }
     } else {
@@ -105,7 +105,8 @@ Packet *TmqhInputFlow(ThreadVars *tv)
     }
 }
 
-static int StoreQueueId(TmqhFlowCtx *ctx, char *name) {
+static int StoreQueueId(TmqhFlowCtx *ctx, char *name)
+{
     Tmq *tmq = TmqGetQueueByName(name);
     if (tmq == NULL) {
         tmq = TmqCreateQueue(SCStrdup(name));
@@ -137,15 +138,18 @@ static int StoreQueueId(TmqhFlowCtx *ctx, char *name) {
     return 0;
 }
 
-/** \brief setup the queue handlers ctx
+/**
+ * \brief setup the queue handlers ctx
  *
- *  Parses a comma separated string "queuename1,queuename2,etc"
+ * Parses a comma separated string "queuename1,queuename2,etc"
- *  and sets the ctx up to devide flows over these queue's.
+ * and sets the ctx up to devide flows over these queue's.
  *
- *  \param queue_str comma separated string with output queue names
+ * \param queue_str comma separated string with output queue names
- *  \retval ctx queues handlers ctx or NULL in error
+ *
+ * \retval ctx queues handlers ctx or NULL in error
  */
-void *TmqhOutputFlowSetupCtx(char *queue_str) {
+void *TmqhOutputFlowSetupCtx(char *queue_str)
+{
     if (queue_str == NULL || strlen(queue_str) == 0)
         return NULL;
 
@@ -182,6 +186,7 @@ void *TmqhOutputFlowSetupCtx(char *queue_str) {
 
     SCFree(str);
     return (void *)ctx;
+
 error:
     SCFree(ctx);
     if (str != NULL)
@@ -189,9 +194,11 @@ error:
     return NULL;
 }
 
-/** \brief select the queue to output to based on flow
+/**
- *  \param tv thread vars
+ * \brief select the queue to output in a round robin fashion.
- *  \param p packet
+ *
+ * \param tv thread vars
+ * \param p packet
  */
 void TmqhOutputFlowRoundRobin(ThreadVars *tv, Packet *p)
 {
@@ -222,11 +229,15 @@ void TmqhOutputFlowRoundRobin(ThreadVars *tv, Packet *p)
     PacketEnqueue(q, p);
     SCCondSignal(&q->cond_q);
     SCMutexUnlock(&q->mutex_q);
+
+    return;
 }
 
-/** \brief select the queue to output to based on flow
+/**
- *  \param tv thread vars
+ * \brief select the queue to output to based on queue lengths.
- *  \param p packet
+ *
+ * \param tv thread vars
+ * \param p packet
  */
 void TmqhOutputFlowActivePackets(ThreadVars *tv, Packet *p)
 {
@@ -266,11 +277,15 @@ void TmqhOutputFlowActivePackets(ThreadVars *tv, Packet *p)
     PacketEnqueue(q, p);
     SCCondSignal(&q->cond_q);
     SCMutexUnlock(&q->mutex_q);
+
+    return;
 }
 
-/** \brief select the queue to output to based on flow
+/**
- *  \param tv thread vars
+ * \brief select the queue to output to based on active flows.
- *  \param p packet
+ *
+ * \param tv thread vars
+ * \param p packet
  */
 void TmqhOutputFlowActiveFlows(ThreadVars *tv, Packet *p)
 {
@@ -309,8 +324,15 @@ void TmqhOutputFlowActiveFlows(ThreadVars *tv, Packet *p)
     PacketEnqueue(q, p);
     SCCondSignal(&q->cond_q);
     SCMutexUnlock(&q->mutex_q);
+
+    return;
 }
 
+/**
+ * \brief Prints flow q handler statistics.
+ *
+ *        Requires engine to be dead when this function's called.
+ */
 void TmqhFlowPrintStatistics(void)
 {
     uint32_t i;
@@ -331,7 +353,8 @@ void TmqhFlowPrintStatistics(void)
 
 #ifdef UNITTESTS
 
-static int TmqhOutputFlowSetupCtxTest01(void) {
+static int TmqhOutputFlowSetupCtxTest01(void)
+{
     int retval = 0;
     Tmq *tmq = NULL;
 
@@ -379,7 +402,8 @@ end:
     return retval;
 }
 
-static int TmqhOutputFlowSetupCtxTest02(void) {
+static int TmqhOutputFlowSetupCtxTest02(void)
+{
     int retval = 0;
     Tmq *tmq = NULL;
 
@@ -421,7 +445,8 @@ end:
     return retval;
 }
 
-static int TmqhOutputFlowSetupCtxTest03(void) {
+static int TmqhOutputFlowSetupCtxTest03(void)
+{
     int retval = 0;
 
     TmqResetQueues();
@@ -457,11 +482,13 @@ end:
 
 #endif /* UNITTESTS */
 
-void TmqhFlowRegisterTests(void) {
+void TmqhFlowRegisterTests(void)
+{
 #ifdef UNITTESTS
     UtRegisterTest("TmqhOutputFlowSetupCtxTest01", TmqhOutputFlowSetupCtxTest01, 1);
     UtRegisterTest("TmqhOutputFlowSetupCtxTest02", TmqhOutputFlowSetupCtxTest02, 1);
     UtRegisterTest("TmqhOutputFlowSetupCtxTest03", TmqhOutputFlowSetupCtxTest03, 1);
 #endif
-}
 
+    return;
+}