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Eyck Jentzsch
2019-06-28 23:08:36 +02:00
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423
FreeRTOSv10.2.1/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/portable/BufferManagement/BufferAllocation_1.c Normal file
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/*
FreeRTOS+TCP V2.0.11
Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
http://aws.amazon.com/freertos
http://www.FreeRTOS.org
*/
/******************************************************************************
*
* See the following web page for essential buffer allocation scheme usage and
* configuration details:
* http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/Embedded_Ethernet_Buffer_Management.html
*
******************************************************************************/
/* Standard includes. */
#include <stdint.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
/* FreeRTOS+TCP includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_IP_Private.h"
#include "NetworkInterface.h"
#include "NetworkBufferManagement.h"
/* For an Ethernet interrupt to be able to obtain a network buffer there must
be at least this number of buffers available. */
#define baINTERRUPT_BUFFER_GET_THRESHOLD ( 3 )
/* A list of free (available) NetworkBufferDescriptor_t structures. */
static List_t xFreeBuffersList;
/* Some statistics about the use of buffers. */
static UBaseType_t uxMinimumFreeNetworkBuffers = 0u;
/* Declares the pool of NetworkBufferDescriptor_t structures that are available
to the system. All the network buffers referenced from xFreeBuffersList exist
in this array. The array is not accessed directly except during initialisation,
when the xFreeBuffersList is filled (as all the buffers are free when the system
is booted). */
static NetworkBufferDescriptor_t xNetworkBuffers[ ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ];
/* This constant is defined as true to let FreeRTOS_TCP_IP.c know that the
network buffers have constant size, large enough to hold the biggest Ethernet
packet. No resizing will be done. */
const BaseType_t xBufferAllocFixedSize = pdTRUE;
/* The semaphore used to obtain network buffers. */
static SemaphoreHandle_t xNetworkBufferSemaphore = NULL;
#if( ipconfigTCP_IP_SANITY != 0 )
static char cIsLow = pdFALSE;
UBaseType_t bIsValidNetworkDescriptor( const NetworkBufferDescriptor_t * pxDesc );
#else
static UBaseType_t bIsValidNetworkDescriptor( const NetworkBufferDescriptor_t * pxDesc );
#endif /* ipconfigTCP_IP_SANITY */
static void prvShowWarnings( void );
/* The user can define their own ipconfigBUFFER_ALLOC_LOCK() and
ipconfigBUFFER_ALLOC_UNLOCK() macros, especially for use form an ISR. If these
are not defined then default them to call the normal enter/exit critical
section macros. */
#if !defined( ipconfigBUFFER_ALLOC_LOCK )
#define ipconfigBUFFER_ALLOC_INIT( ) do {} while (0)
#define ipconfigBUFFER_ALLOC_LOCK_FROM_ISR() \
UBaseType_t uxSavedInterruptStatus = ( UBaseType_t ) portSET_INTERRUPT_MASK_FROM_ISR(); \
{
#define ipconfigBUFFER_ALLOC_UNLOCK_FROM_ISR() \
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus ); \
}
#define ipconfigBUFFER_ALLOC_LOCK() taskENTER_CRITICAL()
#define ipconfigBUFFER_ALLOC_UNLOCK() taskEXIT_CRITICAL()
#endif /* ipconfigBUFFER_ALLOC_LOCK */
/*-----------------------------------------------------------*/
#if( ipconfigTCP_IP_SANITY != 0 )
/* HT: SANITY code will be removed as soon as the library is stable
* and and ready to become public
* Function below gives information about the use of buffers */
#define WARN_LOW ( 2 )
#define WARN_HIGH ( ( 5 * ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ) / 10 )
#endif /* ipconfigTCP_IP_SANITY */
/*-----------------------------------------------------------*/
#if( ipconfigTCP_IP_SANITY != 0 )
BaseType_t prvIsFreeBuffer( const NetworkBufferDescriptor_t *pxDescr )
{
return ( bIsValidNetworkDescriptor( pxDescr ) != 0 ) &&
( listIS_CONTAINED_WITHIN( &xFreeBuffersList, &( pxDescr->xBufferListItem ) ) != 0 );
}
/*-----------------------------------------------------------*/
static void prvShowWarnings( void )
{
UBaseType_t uxCount = uxGetNumberOfFreeNetworkBuffers( );
if( ( ( cIsLow == 0 ) && ( uxCount <= WARN_LOW ) ) || ( ( cIsLow != 0 ) && ( uxCount >= WARN_HIGH ) ) )
{
cIsLow = !cIsLow;
FreeRTOS_debug_printf( ( "*** Warning *** %s %lu buffers left\n", cIsLow ? "only" : "now", uxCount ) );
}
}
/*-----------------------------------------------------------*/
UBaseType_t bIsValidNetworkDescriptor( const NetworkBufferDescriptor_t * pxDesc )
{
uint32_t offset = ( uint32_t ) ( ((const char *)pxDesc) - ((const char *)xNetworkBuffers) );
if( ( offset >= sizeof( xNetworkBuffers ) ) ||
( ( offset % sizeof( xNetworkBuffers[0] ) ) != 0 ) )
return pdFALSE;
return (UBaseType_t) (pxDesc - xNetworkBuffers) + 1;
}
/*-----------------------------------------------------------*/
#else
static UBaseType_t bIsValidNetworkDescriptor (const NetworkBufferDescriptor_t * pxDesc)
{
( void ) pxDesc;
return ( UBaseType_t ) pdTRUE;
}
/*-----------------------------------------------------------*/
static void prvShowWarnings( void )
{
}
/*-----------------------------------------------------------*/
#endif /* ipconfigTCP_IP_SANITY */
BaseType_t xNetworkBuffersInitialise( void )
{
BaseType_t xReturn, x;
/* Only initialise the buffers and their associated kernel objects if they
have not been initialised before. */
if( xNetworkBufferSemaphore == NULL )
{
/* In case alternative locking is used, the mutexes can be initialised
here */
ipconfigBUFFER_ALLOC_INIT();
xNetworkBufferSemaphore = xSemaphoreCreateCounting( ( UBaseType_t ) ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS, ( UBaseType_t ) ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS );
configASSERT( xNetworkBufferSemaphore );
if( xNetworkBufferSemaphore != NULL )
{
vListInitialise( &xFreeBuffersList );
/* Initialise all the network buffers. The buffer storage comes
from the network interface, and different hardware has different
requirements. */
vNetworkInterfaceAllocateRAMToBuffers( xNetworkBuffers );
for( x = 0; x < ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS; x++ )
{
/* Initialise and set the owner of the buffer list items. */
vListInitialiseItem( &( xNetworkBuffers[ x ].xBufferListItem ) );
listSET_LIST_ITEM_OWNER( &( xNetworkBuffers[ x ].xBufferListItem ), &xNetworkBuffers[ x ] );
/* Currently, all buffers are available for use. */
vListInsert( &xFreeBuffersList, &( xNetworkBuffers[ x ].xBufferListItem ) );
}
uxMinimumFreeNetworkBuffers = ( UBaseType_t ) ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS;
}
}
if( xNetworkBufferSemaphore == NULL )
{
xReturn = pdFAIL;
}
else
{
xReturn = pdPASS;
}
return xReturn;
}
/*-----------------------------------------------------------*/
NetworkBufferDescriptor_t *pxGetNetworkBufferWithDescriptor( size_t xRequestedSizeBytes, TickType_t xBlockTimeTicks )
{
NetworkBufferDescriptor_t *pxReturn = NULL;
BaseType_t xInvalid = pdFALSE;
UBaseType_t uxCount;
/* The current implementation only has a single size memory block, so
the requested size parameter is not used (yet). */
( void ) xRequestedSizeBytes;
if( xNetworkBufferSemaphore != NULL )
{
/* If there is a semaphore available, there is a network buffer
available. */
if( xSemaphoreTake( xNetworkBufferSemaphore, xBlockTimeTicks ) == pdPASS )
{
/* Protect the structure as they are accessed from tasks and
interrupts. */
ipconfigBUFFER_ALLOC_LOCK();
{
pxReturn = ( NetworkBufferDescriptor_t * ) listGET_OWNER_OF_HEAD_ENTRY( &xFreeBuffersList );
if( ( bIsValidNetworkDescriptor( pxReturn ) != pdFALSE_UNSIGNED ) &&
listIS_CONTAINED_WITHIN( &xFreeBuffersList, &( pxReturn->xBufferListItem ) ) )
{
uxListRemove( &( pxReturn->xBufferListItem ) );
}
else
{
xInvalid = pdTRUE;
}
}
ipconfigBUFFER_ALLOC_UNLOCK();
if( xInvalid == pdTRUE )
{
/* _RB_ Can printf() be called from an interrupt? (comment
above says this can be called from an interrupt too) */
/* _HT_ The function shall not be called from an ISR. Comment
was indeed misleading. Hopefully clear now?
So the printf()is OK here. */
FreeRTOS_debug_printf( ( "pxGetNetworkBufferWithDescriptor: INVALID BUFFER: %p (valid %lu)\n",
pxReturn, bIsValidNetworkDescriptor( pxReturn ) ) );
pxReturn = NULL;
}
else
{
/* Reading UBaseType_t, no critical section needed. */
uxCount = listCURRENT_LIST_LENGTH( &xFreeBuffersList );
/* For stats, latch the lowest number of network buffers since
booting. */
if( uxMinimumFreeNetworkBuffers > uxCount )
{
uxMinimumFreeNetworkBuffers = uxCount;
}
pxReturn->xDataLength = xRequestedSizeBytes;
#if( ipconfigTCP_IP_SANITY != 0 )
{
prvShowWarnings();
}
#endif /* ipconfigTCP_IP_SANITY */
#if( ipconfigUSE_LINKED_RX_MESSAGES != 0 )
{
/* make sure the buffer is not linked */
pxReturn->pxNextBuffer = NULL;
}
#endif /* ipconfigUSE_LINKED_RX_MESSAGES */
if( xTCPWindowLoggingLevel > 3 )
{
FreeRTOS_debug_printf( ( "BUF_GET[%ld]: %p (%p)\n",
bIsValidNetworkDescriptor( pxReturn ),
pxReturn, pxReturn->pucEthernetBuffer ) );
}
}
iptraceNETWORK_BUFFER_OBTAINED( pxReturn );
}
else
{
iptraceFAILED_TO_OBTAIN_NETWORK_BUFFER();
}
}
return pxReturn;
}
/*-----------------------------------------------------------*/
NetworkBufferDescriptor_t *pxNetworkBufferGetFromISR( size_t xRequestedSizeBytes )
{
NetworkBufferDescriptor_t *pxReturn = NULL;
/* The current implementation only has a single size memory block, so
the requested size parameter is not used (yet). */
( void ) xRequestedSizeBytes;
/* If there is a semaphore available then there is a buffer available, but,
as this is called from an interrupt, only take a buffer if there are at
least baINTERRUPT_BUFFER_GET_THRESHOLD buffers remaining. This prevents,
to a certain degree at least, a rapidly executing interrupt exhausting
buffer and in so doing preventing tasks from continuing. */
if( uxQueueMessagesWaitingFromISR( ( QueueHandle_t ) xNetworkBufferSemaphore ) > ( UBaseType_t ) baINTERRUPT_BUFFER_GET_THRESHOLD )
{
if( xSemaphoreTakeFromISR( xNetworkBufferSemaphore, NULL ) == pdPASS )
{
/* Protect the structure as it is accessed from tasks and interrupts. */
ipconfigBUFFER_ALLOC_LOCK_FROM_ISR();
{
pxReturn = ( NetworkBufferDescriptor_t * ) listGET_OWNER_OF_HEAD_ENTRY( &xFreeBuffersList );
uxListRemove( &( pxReturn->xBufferListItem ) );
}
ipconfigBUFFER_ALLOC_UNLOCK_FROM_ISR();
iptraceNETWORK_BUFFER_OBTAINED_FROM_ISR( pxReturn );
}
}
if( pxReturn == NULL )
{
iptraceFAILED_TO_OBTAIN_NETWORK_BUFFER_FROM_ISR();
}
return pxReturn;
}
/*-----------------------------------------------------------*/
BaseType_t vNetworkBufferReleaseFromISR( NetworkBufferDescriptor_t * const pxNetworkBuffer )
{
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
/* Ensure the buffer is returned to the list of free buffers before the
counting semaphore is 'given' to say a buffer is available. */
ipconfigBUFFER_ALLOC_LOCK_FROM_ISR();
{
vListInsertEnd( &xFreeBuffersList, &( pxNetworkBuffer->xBufferListItem ) );
}
ipconfigBUFFER_ALLOC_UNLOCK_FROM_ISR();
xSemaphoreGiveFromISR( xNetworkBufferSemaphore, &xHigherPriorityTaskWoken );
iptraceNETWORK_BUFFER_RELEASED( pxNetworkBuffer );
return xHigherPriorityTaskWoken;
}
/*-----------------------------------------------------------*/
void vReleaseNetworkBufferAndDescriptor( NetworkBufferDescriptor_t * const pxNetworkBuffer )
{
BaseType_t xListItemAlreadyInFreeList;
if( bIsValidNetworkDescriptor( pxNetworkBuffer ) == pdFALSE_UNSIGNED )
{
FreeRTOS_debug_printf( ( "vReleaseNetworkBufferAndDescriptor: Invalid buffer %p\n", pxNetworkBuffer ) );
return ;
}
/* Ensure the buffer is returned to the list of free buffers before the
counting semaphore is 'given' to say a buffer is available. */
ipconfigBUFFER_ALLOC_LOCK();
{
{
xListItemAlreadyInFreeList = listIS_CONTAINED_WITHIN( &xFreeBuffersList, &( pxNetworkBuffer->xBufferListItem ) );
if( xListItemAlreadyInFreeList == pdFALSE )
{
vListInsertEnd( &xFreeBuffersList, &( pxNetworkBuffer->xBufferListItem ) );
}
}
}
ipconfigBUFFER_ALLOC_UNLOCK();
if( xListItemAlreadyInFreeList )
{
FreeRTOS_debug_printf( ( "vReleaseNetworkBufferAndDescriptor: %p ALREADY RELEASED (now %lu)\n",
pxNetworkBuffer, uxGetNumberOfFreeNetworkBuffers( ) ) );
}
if( xListItemAlreadyInFreeList == pdFALSE )
{
xSemaphoreGive( xNetworkBufferSemaphore );
prvShowWarnings();
if( xTCPWindowLoggingLevel > 3 )
FreeRTOS_debug_printf( ( "BUF_PUT[%ld]: %p (%p) (now %lu)\n",
bIsValidNetworkDescriptor( pxNetworkBuffer ),
pxNetworkBuffer, pxNetworkBuffer->pucEthernetBuffer,
uxGetNumberOfFreeNetworkBuffers( ) ) );
}
iptraceNETWORK_BUFFER_RELEASED( pxNetworkBuffer );
}
/*-----------------------------------------------------------*/
UBaseType_t uxGetMinimumFreeNetworkBuffers( void )
{
return uxMinimumFreeNetworkBuffers;
}
/*-----------------------------------------------------------*/
UBaseType_t uxGetNumberOfFreeNetworkBuffers( void )
{
return listCURRENT_LIST_LENGTH( &xFreeBuffersList );
}
NetworkBufferDescriptor_t *pxResizeNetworkBufferWithDescriptor( NetworkBufferDescriptor_t * pxNetworkBuffer, size_t xNewSizeBytes )
{
/* In BufferAllocation_1.c all network buffer are allocated with a
maximum size of 'ipTOTAL_ETHERNET_FRAME_SIZE'.No need to resize the
network buffer. */
( void ) xNewSizeBytes;
return pxNetworkBuffer;
}
/*#endif */ /* ipconfigINCLUDE_TEST_CODE */

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/*
* FreeRTOS+TCP V2.0.11
* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/******************************************************************************
*
* See the following web page for essential buffer allocation scheme usage and
* configuration details:
* http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/Embedded_Ethernet_Buffer_Management.html
*
******************************************************************************/
/* THIS FILE SHOULD NOT BE USED IF THE PROJECT INCLUDES A MEMORY ALLOCATOR
THAT WILL FRAGMENT THE HEAP MEMORY. For example, heap_2 must not be used,
heap_4 can be used. */
/* Standard includes. */
#include <stdint.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
/* FreeRTOS+TCP includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_IP_Private.h"
#include "NetworkInterface.h"
#include "NetworkBufferManagement.h"
/* The obtained network buffer must be large enough to hold a packet that might
replace the packet that was requested to be sent. */
#if ipconfigUSE_TCP == 1
#define baMINIMAL_BUFFER_SIZE sizeof( TCPPacket_t )
#else
#define baMINIMAL_BUFFER_SIZE sizeof( ARPPacket_t )
#endif /* ipconfigUSE_TCP == 1 */
/*_RB_ This is too complex not to have an explanation. */
#if defined( ipconfigETHERNET_MINIMUM_PACKET_BYTES )
#define ASSERT_CONCAT_(a, b) a##b
#define ASSERT_CONCAT(a, b) ASSERT_CONCAT_(a, b)
#define STATIC_ASSERT(e) \
;enum { ASSERT_CONCAT(assert_line_, __LINE__) = 1/(!!(e)) }
STATIC_ASSERT( ipconfigETHERNET_MINIMUM_PACKET_BYTES <= baMINIMAL_BUFFER_SIZE );
#endif
/* A list of free (available) NetworkBufferDescriptor_t structures. */
static List_t xFreeBuffersList;
/* Some statistics about the use of buffers. */
static size_t uxMinimumFreeNetworkBuffers;
/* Declares the pool of NetworkBufferDescriptor_t structures that are available
to the system. All the network buffers referenced from xFreeBuffersList exist
in this array. The array is not accessed directly except during initialisation,
when the xFreeBuffersList is filled (as all the buffers are free when the system
is booted). */
static NetworkBufferDescriptor_t xNetworkBufferDescriptors[ ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ];
/* This constant is defined as false to let FreeRTOS_TCP_IP.c know that the
network buffers have a variable size: resizing may be necessary */
const BaseType_t xBufferAllocFixedSize = pdFALSE;
/* The semaphore used to obtain network buffers. */
static SemaphoreHandle_t xNetworkBufferSemaphore = NULL;
/*-----------------------------------------------------------*/
BaseType_t xNetworkBuffersInitialise( void )
{
BaseType_t xReturn, x;
/* Only initialise the buffers and their associated kernel objects if they
have not been initialised before. */
if( xNetworkBufferSemaphore == NULL )
{
xNetworkBufferSemaphore = xSemaphoreCreateCounting( ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS, ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS );
configASSERT( xNetworkBufferSemaphore );
if( xNetworkBufferSemaphore != NULL )
{
#if ( configQUEUE_REGISTRY_SIZE > 0 )
{
vQueueAddToRegistry( xNetworkBufferSemaphore, "NetBufSem" );
}
#endif /* configQUEUE_REGISTRY_SIZE */
/* If the trace recorder code is included name the semaphore for viewing
in FreeRTOS+Trace. */
#if( ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1 )
{
extern QueueHandle_t xNetworkEventQueue;
vTraceSetQueueName( xNetworkEventQueue, "IPStackEvent" );
vTraceSetQueueName( xNetworkBufferSemaphore, "NetworkBufferCount" );
}
#endif /* ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1 */
vListInitialise( &xFreeBuffersList );
/* Initialise all the network buffers. No storage is allocated to
the buffers yet. */
for( x = 0; x < ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS; x++ )
{
/* Initialise and set the owner of the buffer list items. */
xNetworkBufferDescriptors[ x ].pucEthernetBuffer = NULL;
vListInitialiseItem( &( xNetworkBufferDescriptors[ x ].xBufferListItem ) );
listSET_LIST_ITEM_OWNER( &( xNetworkBufferDescriptors[ x ].xBufferListItem ), &xNetworkBufferDescriptors[ x ] );
/* Currently, all buffers are available for use. */
vListInsert( &xFreeBuffersList, &( xNetworkBufferDescriptors[ x ].xBufferListItem ) );
}
uxMinimumFreeNetworkBuffers = ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS;
}
}
if( xNetworkBufferSemaphore == NULL )
{
xReturn = pdFAIL;
}
else
{
xReturn = pdPASS;
}
return xReturn;
}
/*-----------------------------------------------------------*/
uint8_t *pucGetNetworkBuffer( size_t *pxRequestedSizeBytes )
{
uint8_t *pucEthernetBuffer;
size_t xSize = *pxRequestedSizeBytes;
if( xSize < baMINIMAL_BUFFER_SIZE )
{
/* Buffers must be at least large enough to hold a TCP-packet with
headers, or an ARP packet, in case TCP is not included. */
xSize = baMINIMAL_BUFFER_SIZE;
}
/* Round up xSize to the nearest multiple of N bytes,
where N equals 'sizeof( size_t )'. */
if( ( xSize & ( sizeof( size_t ) - 1u ) ) != 0u )
{
xSize = ( xSize | ( sizeof( size_t ) - 1u ) ) + 1u;
}
*pxRequestedSizeBytes = xSize;
/* Allocate a buffer large enough to store the requested Ethernet frame size
and a pointer to a network buffer structure (hence the addition of
ipBUFFER_PADDING bytes). */
pucEthernetBuffer = ( uint8_t * ) pvPortMalloc( xSize + ipBUFFER_PADDING );
configASSERT( pucEthernetBuffer );
if( pucEthernetBuffer != NULL )
{
/* Enough space is left at the start of the buffer to place a pointer to
the network buffer structure that references this Ethernet buffer.
Return a pointer to the start of the Ethernet buffer itself. */
pucEthernetBuffer += ipBUFFER_PADDING;
}
return pucEthernetBuffer;
}
/*-----------------------------------------------------------*/
void vReleaseNetworkBuffer( uint8_t *pucEthernetBuffer )
{
/* There is space before the Ethernet buffer in which a pointer to the
network buffer that references this Ethernet buffer is stored. Remove the
space before freeing the buffer. */
if( pucEthernetBuffer != NULL )
{
pucEthernetBuffer -= ipBUFFER_PADDING;
vPortFree( ( void * ) pucEthernetBuffer );
}
}
/*-----------------------------------------------------------*/
NetworkBufferDescriptor_t *pxGetNetworkBufferWithDescriptor( size_t xRequestedSizeBytes, TickType_t xBlockTimeTicks )
{
NetworkBufferDescriptor_t *pxReturn = NULL;
size_t uxCount;
if( ( xRequestedSizeBytes != 0u ) && ( xRequestedSizeBytes < ( size_t ) baMINIMAL_BUFFER_SIZE ) )
{
/* ARP packets can replace application packets, so the storage must be
at least large enough to hold an ARP. */
xRequestedSizeBytes = baMINIMAL_BUFFER_SIZE;
}
/* Add 2 bytes to xRequestedSizeBytes and round up xRequestedSizeBytes
to the nearest multiple of N bytes, where N equals 'sizeof( size_t )'. */
xRequestedSizeBytes += 2u;
if( ( xRequestedSizeBytes & ( sizeof( size_t ) - 1u ) ) != 0u )
{
xRequestedSizeBytes = ( xRequestedSizeBytes | ( sizeof( size_t ) - 1u ) ) + 1u;
}
/* If there is a semaphore available, there is a network buffer available. */
if( xSemaphoreTake( xNetworkBufferSemaphore, xBlockTimeTicks ) == pdPASS )
{
/* Protect the structure as it is accessed from tasks and interrupts. */
taskENTER_CRITICAL();
{
pxReturn = ( NetworkBufferDescriptor_t * ) listGET_OWNER_OF_HEAD_ENTRY( &xFreeBuffersList );
uxListRemove( &( pxReturn->xBufferListItem ) );
}
taskEXIT_CRITICAL();
/* Reading UBaseType_t, no critical section needed. */
uxCount = listCURRENT_LIST_LENGTH( &xFreeBuffersList );
if( uxMinimumFreeNetworkBuffers > uxCount )
{
uxMinimumFreeNetworkBuffers = uxCount;
}
/* Allocate storage of exactly the requested size to the buffer. */
configASSERT( pxReturn->pucEthernetBuffer == NULL );
if( xRequestedSizeBytes > 0 )
{
/* Extra space is obtained so a pointer to the network buffer can
be stored at the beginning of the buffer. */
pxReturn->pucEthernetBuffer = ( uint8_t * ) pvPortMalloc( xRequestedSizeBytes + ipBUFFER_PADDING );
if( pxReturn->pucEthernetBuffer == NULL )
{
/* The attempt to allocate storage for the buffer payload failed,
so the network buffer structure cannot be used and must be
released. */
vReleaseNetworkBufferAndDescriptor( pxReturn );
pxReturn = NULL;
}
else
{
/* Store a pointer to the network buffer structure in the
buffer storage area, then move the buffer pointer on past the
stored pointer so the pointer value is not overwritten by the
application when the buffer is used. */
*( ( NetworkBufferDescriptor_t ** ) ( pxReturn->pucEthernetBuffer ) ) = pxReturn;
pxReturn->pucEthernetBuffer += ipBUFFER_PADDING;
/* Store the actual size of the allocated buffer, which may be
greater than the original requested size. */
pxReturn->xDataLength = xRequestedSizeBytes;
#if( ipconfigUSE_LINKED_RX_MESSAGES != 0 )
{
/* make sure the buffer is not linked */
pxReturn->pxNextBuffer = NULL;
}
#endif /* ipconfigUSE_LINKED_RX_MESSAGES */
}
}
else
{
/* A descriptor is being returned without an associated buffer being
allocated. */
}
}
if( pxReturn == NULL )
{
iptraceFAILED_TO_OBTAIN_NETWORK_BUFFER();
}
else
{
iptraceNETWORK_BUFFER_OBTAINED( pxReturn );
}
return pxReturn;
}
/*-----------------------------------------------------------*/
void vReleaseNetworkBufferAndDescriptor( NetworkBufferDescriptor_t * const pxNetworkBuffer )
{
BaseType_t xListItemAlreadyInFreeList;
/* Ensure the buffer is returned to the list of free buffers before the
counting semaphore is 'given' to say a buffer is available. Release the
storage allocated to the buffer payload. THIS FILE SHOULD NOT BE USED
IF THE PROJECT INCLUDES A MEMORY ALLOCATOR THAT WILL FRAGMENT THE HEAP
MEMORY. For example, heap_2 must not be used, heap_4 can be used. */
vReleaseNetworkBuffer( pxNetworkBuffer->pucEthernetBuffer );
pxNetworkBuffer->pucEthernetBuffer = NULL;
taskENTER_CRITICAL();
{
xListItemAlreadyInFreeList = listIS_CONTAINED_WITHIN( &xFreeBuffersList, &( pxNetworkBuffer->xBufferListItem ) );
if( xListItemAlreadyInFreeList == pdFALSE )
{
vListInsertEnd( &xFreeBuffersList, &( pxNetworkBuffer->xBufferListItem ) );
}
}
taskEXIT_CRITICAL();
/*
* Update the network state machine, unless the program fails to release its 'xNetworkBufferSemaphore'.
* The program should only try to release its semaphore if 'xListItemAlreadyInFreeList' is false.
*/
if( xListItemAlreadyInFreeList == pdFALSE )
{
if ( xSemaphoreGive( xNetworkBufferSemaphore ) == pdTRUE )
{
iptraceNETWORK_BUFFER_RELEASED( pxNetworkBuffer );
}
}
else
{
iptraceNETWORK_BUFFER_RELEASED( pxNetworkBuffer );
}
}
/*-----------------------------------------------------------*/
/*
* Returns the number of free network buffers
*/
UBaseType_t uxGetNumberOfFreeNetworkBuffers( void )
{
return listCURRENT_LIST_LENGTH( &xFreeBuffersList );
}
/*-----------------------------------------------------------*/
UBaseType_t uxGetMinimumFreeNetworkBuffers( void )
{
return uxMinimumFreeNetworkBuffers;
}
/*-----------------------------------------------------------*/
NetworkBufferDescriptor_t *pxResizeNetworkBufferWithDescriptor( NetworkBufferDescriptor_t * pxNetworkBuffer, size_t xNewSizeBytes )
{
size_t xOriginalLength;
uint8_t *pucBuffer;
xOriginalLength = pxNetworkBuffer->xDataLength + ipBUFFER_PADDING;
xNewSizeBytes = xNewSizeBytes + ipBUFFER_PADDING;
pucBuffer = pucGetNetworkBuffer( &( xNewSizeBytes ) );
if( pucBuffer == NULL )
{
/* In case the allocation fails, return NULL. */
pxNetworkBuffer = NULL;
}
else
{
pxNetworkBuffer->xDataLength = xNewSizeBytes;
if( xNewSizeBytes > xOriginalLength )
{
xNewSizeBytes = xOriginalLength;
}
memcpy( pucBuffer - ipBUFFER_PADDING, pxNetworkBuffer->pucEthernetBuffer - ipBUFFER_PADDING, xNewSizeBytes );
vReleaseNetworkBuffer( pxNetworkBuffer->pucEthernetBuffer );
pxNetworkBuffer->pucEthernetBuffer = pucBuffer;
}
return pxNetworkBuffer;
}