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/* Copyright (C) 2007-2012 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*/
#ifndef __FLOW_HASH_H__
#define __FLOW_HASH_H__
/** Spinlocks or Mutex for the flow buckets. */
//#define FBLOCK_SPIN
#define FBLOCK_MUTEX
#ifdef FBLOCK_SPIN
#ifdef FBLOCK_MUTEX
#error Cannot enable both FBLOCK_SPIN and FBLOCK_MUTEX
#endif
#endif
/* flow hash bucket -- the hash is basically an array of these buckets.
* Each bucket contains a flow or list of flows. All these flows have
* the same hashkey (the hash is a chained hash). When doing modifications
* to the list, the entire bucket is locked. */
typedef struct FlowBucket_ {
Flow *head;
Flow *tail;
#ifdef FBLOCK_MUTEX
SCMutex m;
#elif defined FBLOCK_SPIN
SCSpinlock s;
#else
#error Enable FBLOCK_SPIN or FBLOCK_MUTEX
#endif
} __attribute__((aligned(CLS))) FlowBucket;
#ifdef FBLOCK_SPIN
#define FBLOCK_INIT(fb) SCSpinInit(&(fb)->s, 0)
#define FBLOCK_DESTROY(fb) SCSpinDestroy(&(fb)->s)
#define FBLOCK_LOCK(fb) SCSpinLock(&(fb)->s)
#define FBLOCK_TRYLOCK(fb) SCSpinTrylock(&(fb)->s)
#define FBLOCK_UNLOCK(fb) SCSpinUnlock(&(fb)->s)
#elif defined FBLOCK_MUTEX
#define FBLOCK_INIT(fb) SCMutexInit(&(fb)->m, NULL)
#define FBLOCK_DESTROY(fb) SCMutexDestroy(&(fb)->m)
#define FBLOCK_LOCK(fb) SCMutexLock(&(fb)->m)
#define FBLOCK_TRYLOCK(fb) SCMutexTrylock(&(fb)->m)
#define FBLOCK_UNLOCK(fb) SCMutexUnlock(&(fb)->m)
#else
#error Enable FBLOCK_SPIN or FBLOCK_MUTEX
#endif
/* prototypes */
Flow *FlowGetFlowFromHash(ThreadVars *tv, DecodeThreadVars *dtv, const Packet *);
void FlowDisableTcpReuseHandling(void);
/** enable to print stats on hash lookups in flow-debug.log */
//#define FLOW_DEBUG_STATS
#ifdef FLOW_DEBUG_STATS
void FlowHashDebugInit(void);
void FlowHashDebugDeinit(void);
void FlowHashDebugPrint(uint32_t);
#else
#define FlowHashDebugInit(...)
#define FlowHashDebugPrint(...)
#define FlowHashDebugDeinit(...)
#endif
#endif /* __FLOW_HASH_H__ */
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