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#define xBUFFER_CACHE_SIZE 10
#define xMAX_FAULT_INJECTION_RATE 15
#define xMIN_FAULT_INJECTION_RATE 3
#define xNUM_FAULT_TYPES 1
static NetworkBufferDescriptor_t *xNetworkBufferCache[ xBUFFER_CACHE_SIZE ] = { 0 };
#define xFAULT_LOG_SIZE 2048
uint32_t ulInjectedFault[ xFAULT_LOG_SIZE ];
uint32_t ulFaultLogIndex = 0;
static BaseType_t prvCachePacket( NetworkBufferDescriptor_t *pxNetworkBufferIn )
{
BaseType_t x, xReturn = pdFALSE;
for( x = 0; x < xBUFFER_CACHE_SIZE; x++ )
{
if( xNetworkBufferCache[ x ] == NULL )
{
xNetworkBufferCache[ x ] = pxNetworkBufferIn;
xReturn = pdTRUE;
break;
}
}
return xReturn;
}
/*-----------------------------------------------------------*/
static NetworkBufferDescriptor_t *prvGetCachedPacket( void )
{
BaseType_t x;
NetworkBufferDescriptor_t *pxReturn = NULL;
for( x = ( xBUFFER_CACHE_SIZE - 1 ); x >= 0; x-- )
{
if( xNetworkBufferCache[ x ] != NULL )
{
pxReturn = xNetworkBufferCache[ x ];
xNetworkBufferCache[ x ] = NULL;
break;
}
}
return pxReturn;
}
/*-----------------------------------------------------------*/
static NetworkBufferDescriptor_t *prvDuplicatePacket( NetworkBufferDescriptor_t * pxOriginalPacket, const uint8_t *pucPacketData )
{
NetworkBufferDescriptor_t *pxReturn;
/* Obtain a new descriptor. */
pxReturn = pxGetNetworkBufferWithDescriptor( pxOriginalPacket->xDataLength, 0 );
if( pxReturn != NULL )
{
/* Copy in the packet data. */
pxReturn->xDataLength = pxOriginalPacket->xDataLength;
memcpy( pxReturn->pucEthernetBuffer, pucPacketData, pxOriginalPacket->xDataLength );
}
return pxReturn;
}
/*-----------------------------------------------------------*/
static NetworkBufferDescriptor_t *prvRxFaultInjection( NetworkBufferDescriptor_t *pxNetworkBufferIn, const uint8_t *pucPacketData )
{
static uint32_t ulCallCount = 0, ulNextFaultCallCount = 0;
NetworkBufferDescriptor_t *pxReturn = pxNetworkBufferIn;
IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL };
uint32_t ulFault;
return pxNetworkBufferIn;
ulCallCount++;
if( ulCallCount > ulNextFaultCallCount )
{
xApplicationGetRandomNumber( &( ulNextFaultCallCount ) );
ulNextFaultCallCount = ulNextFaultCallCount % xMAX_FAULT_INJECTION_RATE;
if( ulNextFaultCallCount < xMIN_FAULT_INJECTION_RATE )
{
ulNextFaultCallCount = xMIN_FAULT_INJECTION_RATE;
}
ulCallCount = 0;
xApplicationGetRandomNumber( &( ulFault ) );
ulFault = ulFault % xNUM_FAULT_TYPES;
if( ulFaultLogIndex < xFAULT_LOG_SIZE )
{
ulInjectedFault[ ulFaultLogIndex ] = ulFault;
ulFaultLogIndex++;
}
switch( ulFault )
{
case 0:
/* Just drop the packet. */
vReleaseNetworkBufferAndDescriptor( pxNetworkBufferIn );
pxReturn = NULL;
break;
case 1:
/* Store the packet in the cache for later. */
if( prvCachePacket( pxNetworkBufferIn ) == pdTRUE )
{
/* The packet may get sent later, it is not being sent
now. */
pxReturn = NULL;
}
break;
case 2:
/* Send a cached packet. */
pxReturn = prvGetCachedPacket();
if( pxReturn != NULL )
{
/* A cached packet was obtained so drop the original
packet. */
vReleaseNetworkBufferAndDescriptor( pxNetworkBufferIn );
}
else
{
/* Could not obtain a packet from the cache so just return
the packet that was passed in. */
pxReturn = pxNetworkBufferIn;
}
break;
case 4:
/* Send a duplicate of the packet right away. */
pxReturn = prvDuplicatePacket( pxNetworkBufferIn, pucPacketData );
/* Send the original packet to the stack. */
xRxEvent.pvData = ( void * ) pxNetworkBufferIn;
if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL )
{
vReleaseNetworkBufferAndDescriptor( pxNetworkBufferIn );
}
break;
case 5:
/* Send both a cached packet and the current packet. */
xRxEvent.pvData = ( void * ) prvGetCachedPacket();
if( xRxEvent.pvData != NULL )
{
if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL )
{
vReleaseNetworkBufferAndDescriptor( pxNetworkBufferIn );
}
}
break;
case 6:
case 7:
case 8:
/* Store the packet in the cache for later. */
if( prvCachePacket( pxNetworkBufferIn ) == pdTRUE )
{
/* The packet may get sent later, it is not being sent
now. */
pxReturn = NULL;
}
break;
}
}
return pxReturn;
}
/*-----------------------------------------------------------*/
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