561 lines
16 KiB
C
561 lines
16 KiB
C
|
// Copyright (c) 1997, Microsoft Corporation, all rights reserved
|
||
|
|
//
|
||
|
|
// bpool.c
|
||
|
|
// RAS L2TP WAN mini-port/call-manager driver
|
||
|
|
// Buffer pool management routines
|
||
|
|
//
|
||
|
|
// 01/07/97 Steve Cobb, adapted from Gurdeep's WANARP code.
|
||
|
|
|
||
|
|
|
||
|
|
#include "ptiwan.h"
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Local prototypes (alphabetically)
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
CHAR*
|
||
|
|
AddBufferBlockToPool(
|
||
|
|
IN BUFFERPOOL* pPool );
|
||
|
|
|
||
|
|
VOID
|
||
|
|
FreeUnusedBufferPoolBlocks(
|
||
|
|
IN BUFFERPOOL* pPool );
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Interface routines
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
VOID
|
||
|
|
InitBufferPool(
|
||
|
|
OUT BUFFERPOOL* pPool,
|
||
|
|
IN ULONG ulBufferSize,
|
||
|
|
IN ULONG ulMaxBuffers,
|
||
|
|
IN ULONG ulBuffersPerBlock,
|
||
|
|
IN ULONG ulFreesPerCollection,
|
||
|
|
IN BOOLEAN fAssociateNdisBuffer,
|
||
|
|
IN ULONG ulTag )
|
||
|
|
|
||
|
|
// Initialize caller's buffer pool control block 'pPool'. 'UlBufferSize'
|
||
|
|
// is the size in bytes of an individual buffer. 'UlMaxBuffers' is the
|
||
|
|
// maximum number of buffers allowed in the entire pool or 0 for
|
||
|
|
// unlimited. 'UlBuffersPerBlock' is the number of buffers to include in
|
||
|
|
// each block of buffers. 'UlFreesPerCollection' is the number of
|
||
|
|
// FreeBufferToPool calls until the next garbage collect scan, or 0 for
|
||
|
|
// default. 'FAssociateNdisBuffer' is set if an NDIS_BUFFER should be
|
||
|
|
// allocated and associated with each individual buffer. 'UlTag' is the
|
||
|
|
// memory identification tag to use when allocating blocks.
|
||
|
|
//
|
||
|
|
// IMPORTANT: Caller's 'pPool' buffer must be protected from multiple
|
||
|
|
// access during this call.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
pPool->ulBufferSize = ulBufferSize;
|
||
|
|
pPool->ulMaxBuffers = ulMaxBuffers;
|
||
|
|
pPool->ulBuffersPerBlock = ulBuffersPerBlock;
|
||
|
|
pPool->ulFreesSinceCollection = 0;
|
||
|
|
pPool->fAssociateNdisBuffer = fAssociateNdisBuffer;
|
||
|
|
pPool->ulTag = ulTag;
|
||
|
|
|
||
|
|
if (ulFreesPerCollection)
|
||
|
|
{
|
||
|
|
pPool->ulFreesPerCollection = ulFreesPerCollection;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Calculate default garbage collection trigger. Don't want to be too
|
||
|
|
// aggressive here.
|
||
|
|
//
|
||
|
|
pPool->ulFreesPerCollection = 50 * pPool->ulBuffersPerBlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
TRACE( TL_N, TM_Pool, ( "InitBp tag=$%08x buf=%d cnt=%d",
|
||
|
|
pPool->ulTag, pPool->ulBufferSize, pPool->ulBuffersPerBlock ) );
|
||
|
|
|
||
|
|
InitializeListHead( &pPool->listBlocks );
|
||
|
|
InitializeListHead( &pPool->listFreeBuffers );
|
||
|
|
NdisAllocateSpinLock( &pPool->lock );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
BOOLEAN
|
||
|
|
FreeBufferPool(
|
||
|
|
IN BUFFERPOOL* pPool )
|
||
|
|
|
||
|
|
// Free up all resources allocated in buffer pool 'pPool'. This is the
|
||
|
|
// inverse of InitBufferPool.
|
||
|
|
//
|
||
|
|
// Returns true if successful, false if any of the pool could not be freed
|
||
|
|
// due to outstanding packets.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
BOOLEAN fSuccess;
|
||
|
|
|
||
|
|
TRACE( TL_N, TM_Pool, ( "FreeBp" ) );
|
||
|
|
|
||
|
|
NdisAcquireSpinLock( &pPool->lock );
|
||
|
|
{
|
||
|
|
FreeUnusedBufferPoolBlocks( pPool );
|
||
|
|
fSuccess = (pPool->ulCurBuffers == 0);
|
||
|
|
}
|
||
|
|
NdisReleaseSpinLock( &pPool->lock );
|
||
|
|
|
||
|
|
return fSuccess;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
CHAR*
|
||
|
|
GetBufferFromPool(
|
||
|
|
IN BUFFERPOOL* pPool )
|
||
|
|
|
||
|
|
// Returns the address of the useable memory in an individual buffer
|
||
|
|
// allocated from the pool 'pPool'. The pool is expanded, if necessary,
|
||
|
|
// but caller should still check for NULL return since the pool may have
|
||
|
|
// been at maximum size.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
LIST_ENTRY* pLink;
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
CHAR* pBuffer;
|
||
|
|
|
||
|
|
NdisAcquireSpinLock( &pPool->lock );
|
||
|
|
{
|
||
|
|
if (IsListEmpty( &pPool->listFreeBuffers ))
|
||
|
|
{
|
||
|
|
pLink = NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pLink = RemoveHeadList( &pPool->listFreeBuffers );
|
||
|
|
pHead = CONTAINING_RECORD( pLink, BUFFERHEAD, linkFreeBuffers );
|
||
|
|
--pHead->pBlock->ulFreeBuffers;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
NdisReleaseSpinLock( &pPool->lock );
|
||
|
|
|
||
|
|
if (pLink)
|
||
|
|
{
|
||
|
|
pBuffer = (CHAR* )(pHead + 1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// The free list was empty. Try to expand the pool.
|
||
|
|
//
|
||
|
|
pBuffer = AddBufferBlockToPool( pPool );
|
||
|
|
}
|
||
|
|
|
||
|
|
DBG_if (pBuffer)
|
||
|
|
{
|
||
|
|
pHead = (BUFFERHEAD* )(pBuffer - sizeof(BUFFERHEAD));
|
||
|
|
TRACE( TL_N, TM_Pool, ( "GetBfp=$%p, %d free",
|
||
|
|
pBuffer, pHead->pBlock->ulFreeBuffers ) );
|
||
|
|
}
|
||
|
|
DBG_else
|
||
|
|
{
|
||
|
|
TRACE( TL_A, TM_Pool, ( "GetBfp failed?" ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
return pBuffer;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
VOID
|
||
|
|
FreeBufferToPool(
|
||
|
|
IN BUFFERPOOL* pPool,
|
||
|
|
IN CHAR* pBuffer,
|
||
|
|
IN BOOLEAN fGarbageCollection )
|
||
|
|
|
||
|
|
// Returns 'pBuffer' to the pool of unused buffers 'pPool'. 'PBuffer'
|
||
|
|
// must have been previously allocated with GetBufferFromPool.
|
||
|
|
// 'FGarbageCollection' is set when the free should be considered for
|
||
|
|
// purposes of garbage collection. This is used by the AddBufferToPool
|
||
|
|
// routine to avoid counting the initial "add" frees. Normal callers
|
||
|
|
// should set this flag.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pHead = ((BUFFERHEAD* )pBuffer) - 1;
|
||
|
|
|
||
|
|
DBG_if (fGarbageCollection)
|
||
|
|
{
|
||
|
|
TRACE( TL_N, TM_Pool, ( "FreeBtoP($%0x) %d free",
|
||
|
|
pBuffer, pHead->pBlock->ulFreeBuffers + 1 ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
NdisAcquireSpinLock( &pPool->lock );
|
||
|
|
{
|
||
|
|
InsertHeadList( &pPool->listFreeBuffers, &pHead->linkFreeBuffers );
|
||
|
|
++pHead->pBlock->ulFreeBuffers;
|
||
|
|
|
||
|
|
if (fGarbageCollection)
|
||
|
|
{
|
||
|
|
++pPool->ulFreesSinceCollection;
|
||
|
|
|
||
|
|
if (pPool->ulFreesSinceCollection >= pPool->ulFreesPerCollection)
|
||
|
|
{
|
||
|
|
// Time to collect garbage, i.e. free any blocks in the pool
|
||
|
|
// not in use.
|
||
|
|
//
|
||
|
|
FreeUnusedBufferPoolBlocks( pPool );
|
||
|
|
pPool->ulFreesSinceCollection = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
NdisReleaseSpinLock( &pPool->lock );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
NDIS_BUFFER*
|
||
|
|
NdisBufferFromBuffer(
|
||
|
|
IN CHAR* pBuffer )
|
||
|
|
|
||
|
|
// Returns the NDIS_BUFFER associated with the buffer 'pBuffer' which was
|
||
|
|
// obtained previously with GetBufferFromPool.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pHead = ((BUFFERHEAD* )pBuffer) - 1;
|
||
|
|
return pHead->pNdisBuffer;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
ULONG
|
||
|
|
BufferSizeFromBuffer(
|
||
|
|
IN CHAR* pBuffer )
|
||
|
|
|
||
|
|
// Returns the original size of the buffer 'pBuffer' which was obtained
|
||
|
|
// previously with GetBufferFromPool. This is useful for undoing
|
||
|
|
// NdisAdjustBufferLength.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pHead = ((BUFFERHEAD* )pBuffer) - 1;
|
||
|
|
return pHead->pBlock->pPool->ulBufferSize;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
NDIS_BUFFER*
|
||
|
|
PoolHandleForNdisCopyBufferFromBuffer(
|
||
|
|
IN CHAR* pBuffer )
|
||
|
|
|
||
|
|
// Returns the handle of the pool from which the NDIS_BUFFER associated
|
||
|
|
// with the buffer 'pBuffer' was obtained. Caller may use the handle to
|
||
|
|
// pass to NdisCopyBuffer, one such use per buffer at a time.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pHead = ((BUFFERHEAD* )pBuffer) - 1;
|
||
|
|
return pHead->pBlock->hNdisPool;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Local utility routines (alphabetically)
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
CHAR*
|
||
|
|
AddBufferBlockToPool(
|
||
|
|
IN BUFFERPOOL* pPool )
|
||
|
|
|
||
|
|
// Allocate a new buffer block and add it to the buffer pool 'pPool'.
|
||
|
|
//
|
||
|
|
// Returns the address of the usable memory of an individual buffer
|
||
|
|
// allocated from the pool or NULL if none.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
NDIS_STATUS status;
|
||
|
|
BUFFERBLOCKHEAD* pNew;
|
||
|
|
ULONG ulSize;
|
||
|
|
ULONG ulCount;
|
||
|
|
BOOLEAN fOk;
|
||
|
|
BOOLEAN fAssociateNdisBuffer;
|
||
|
|
CHAR* pReturn;
|
||
|
|
|
||
|
|
TRACE( TL_A, TM_Pool, ( "AddBpBlock(%d+%d)",
|
||
|
|
pPool->ulCurBuffers, pPool->ulBuffersPerBlock ) );
|
||
|
|
|
||
|
|
fOk = FALSE;
|
||
|
|
pNew = NULL;
|
||
|
|
|
||
|
|
NdisAcquireSpinLock( &pPool->lock );
|
||
|
|
{
|
||
|
|
// Save this for reference after the lock is released.
|
||
|
|
//
|
||
|
|
fAssociateNdisBuffer = pPool->fAssociateNdisBuffer;
|
||
|
|
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (pPool->ulMaxBuffers
|
||
|
|
&& pPool->ulCurBuffers >= pPool->ulMaxBuffers)
|
||
|
|
{
|
||
|
|
// No can do. The pool's already at maximum size.
|
||
|
|
//
|
||
|
|
TRACE( TL_A, TM_Pool, ( "Bp maxed?" ) );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Calculate the contiguous block's size and the number of buffers
|
||
|
|
// it will hold.
|
||
|
|
//
|
||
|
|
ulCount = pPool->ulBuffersPerBlock;
|
||
|
|
if (pPool->ulMaxBuffers)
|
||
|
|
{
|
||
|
|
if (ulCount > pPool->ulMaxBuffers - pPool->ulCurBuffers)
|
||
|
|
ulCount = pPool->ulMaxBuffers - pPool->ulCurBuffers;
|
||
|
|
}
|
||
|
|
ulSize = sizeof(BUFFERBLOCKHEAD) +
|
||
|
|
(ulCount * (sizeof(BUFFERHEAD) + pPool->ulBufferSize));
|
||
|
|
|
||
|
|
// Allocate the contiguous memory block for the BUFFERBLOCK header
|
||
|
|
// and the individual buffers.
|
||
|
|
//
|
||
|
|
pNew = ALLOC_NONPAGED( ulSize, pPool->ulTag );
|
||
|
|
if (!pNew)
|
||
|
|
{
|
||
|
|
TRACE( TL_A, TM_Pool, ( "Alloc BB?" ) );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Zero only the block header portion.
|
||
|
|
*/
|
||
|
|
NdisZeroMemory( pNew, sizeof(BUFFERBLOCKHEAD) );
|
||
|
|
|
||
|
|
if (fAssociateNdisBuffer)
|
||
|
|
{
|
||
|
|
// Allocate a pool of NDIS_BUFFER descriptors.
|
||
|
|
//
|
||
|
|
// Twice as many descriptors are allocated as buffers so
|
||
|
|
// caller can use the PoolHandleForNdisCopyBufferFromBuffer
|
||
|
|
// routine to obtain a pool handle to pass to the
|
||
|
|
// NdisCopyBuffer used to trim the L2TP header from received
|
||
|
|
// packets. In the current NDIS implmentation on NT this does
|
||
|
|
// nothing but return a NULL handle and STATUS_SUCCESS,
|
||
|
|
// because NDIS_BUFFER's are just MDL's,
|
||
|
|
// NdisAllocateBufferPool is basically a no-op, and for that
|
||
|
|
// matter, NdisCopyBuffer doesn't really use the pool handle
|
||
|
|
// it's passed. It's cheap to stay strictly compliant here,
|
||
|
|
// though, so we do that.
|
||
|
|
//
|
||
|
|
NdisAllocateBufferPool(
|
||
|
|
&status, &pNew->hNdisPool, ulCount * 2 );
|
||
|
|
if (status != NDIS_STATUS_SUCCESS)
|
||
|
|
{
|
||
|
|
TRACE( TL_A, TM_Pool, ( "AllocBp=$%p?", status ) );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Fill in the back pointer to the pool.
|
||
|
|
//
|
||
|
|
pNew->pPool = pPool;
|
||
|
|
|
||
|
|
// Link the new block. At this point, all the buffers are
|
||
|
|
// effectively "in use". They are made available in the loop
|
||
|
|
// below.
|
||
|
|
//
|
||
|
|
pNew->ulBuffers = ulCount;
|
||
|
|
pPool->ulCurBuffers += ulCount;
|
||
|
|
InsertHeadList( &pPool->listBlocks, &pNew->linkBlocks );
|
||
|
|
|
||
|
|
fOk = TRUE;
|
||
|
|
}
|
||
|
|
while (FALSE);
|
||
|
|
}
|
||
|
|
NdisReleaseSpinLock( &pPool->lock );
|
||
|
|
|
||
|
|
if (!fOk)
|
||
|
|
{
|
||
|
|
// Bailing, undo whatever succeeded.
|
||
|
|
//
|
||
|
|
if (pNew)
|
||
|
|
{
|
||
|
|
FREE_NONPAGED( pNew );
|
||
|
|
if (pNew->hNdisPool)
|
||
|
|
{
|
||
|
|
NdisFreeBufferPool( pNew->hNdisPool );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Initialize each individual buffer slice and add it to the list of free
|
||
|
|
// buffers.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
ULONG i;
|
||
|
|
CHAR* pBuffer;
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pReturn = NULL;
|
||
|
|
|
||
|
|
// For each slice of the block, where a slice consists of a BUFFERHEAD
|
||
|
|
// and the buffer memory that immediately follows it...
|
||
|
|
//
|
||
|
|
for (i = 0, pHead = (BUFFERHEAD* )(pNew + 1);
|
||
|
|
i < ulCount;
|
||
|
|
++i, pHead = (BUFFERHEAD* )
|
||
|
|
((CHAR* )(pHead + 1) + pPool->ulBufferSize))
|
||
|
|
{
|
||
|
|
pBuffer = (CHAR* )(pHead + 1);
|
||
|
|
|
||
|
|
InitializeListHead( &pHead->linkFreeBuffers );
|
||
|
|
pHead->pBlock = pNew;
|
||
|
|
pHead->pNdisBuffer = NULL;
|
||
|
|
|
||
|
|
if (fAssociateNdisBuffer)
|
||
|
|
{
|
||
|
|
// Associate an NDIS_BUFFER descriptor from the pool we
|
||
|
|
// allocated above.
|
||
|
|
//
|
||
|
|
NdisAllocateBuffer(
|
||
|
|
&status, &pHead->pNdisBuffer, pNew->hNdisPool,
|
||
|
|
pBuffer, pPool->ulBufferSize );
|
||
|
|
|
||
|
|
if (status != NDIS_STATUS_SUCCESS)
|
||
|
|
{
|
||
|
|
TRACE( TL_A, TM_Pool, ( "AllocB=$%p?", status ) );
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pReturn)
|
||
|
|
{
|
||
|
|
// Add the constructed buffer to the list of free buffers.
|
||
|
|
// The 'FALSE' tells the garbage collection algorithm the
|
||
|
|
// operation is an "add" rather than a "release" and should be
|
||
|
|
// ignored.
|
||
|
|
//
|
||
|
|
FreeBufferToPool( pPool, pBuffer, FALSE );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// The first successfully constructed buffer is returned by
|
||
|
|
// this routine.
|
||
|
|
//
|
||
|
|
pReturn = pBuffer;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return pReturn;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
VOID
|
||
|
|
FreeUnusedBufferPoolBlocks(
|
||
|
|
IN BUFFERPOOL* pPool )
|
||
|
|
|
||
|
|
// Check if any of the blocks in pool 'pPool' are not in use, and if so,
|
||
|
|
// free them.
|
||
|
|
//
|
||
|
|
// IMPORTANT: Caller must hold the pool lock.
|
||
|
|
//
|
||
|
|
// The MSDN doc says that no locks may be held while calling
|
||
|
|
// NdisFreePacketXxx, but according to JameelH that is incorrect.
|
||
|
|
//
|
||
|
|
{
|
||
|
|
LIST_ENTRY* pLink;
|
||
|
|
|
||
|
|
TRACE( TL_A, TM_Pool, ( "FreeUnusedBpBlocks" ) );
|
||
|
|
|
||
|
|
// For each block in the pool...
|
||
|
|
//
|
||
|
|
pLink = pPool->listBlocks.Flink;
|
||
|
|
while (pLink != &pPool->listBlocks)
|
||
|
|
{
|
||
|
|
LIST_ENTRY* pLinkNext;
|
||
|
|
BUFFERBLOCKHEAD* pBlock;
|
||
|
|
|
||
|
|
pLinkNext = pLink->Flink;
|
||
|
|
|
||
|
|
pBlock = CONTAINING_RECORD( pLink, BUFFERBLOCKHEAD, linkBlocks );
|
||
|
|
if (pBlock->ulFreeBuffers >= pBlock->ulBuffers)
|
||
|
|
{
|
||
|
|
|
||
|
|
#if 1 // Assume all buffers are free at time of call.
|
||
|
|
|
||
|
|
ULONG i;
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
TRACE( TL_A, TM_Pool, ( "FreeBpBlock(%d-%d)",
|
||
|
|
pPool->ulCurBuffers, pPool->ulBuffersPerBlock ) );
|
||
|
|
|
||
|
|
// Found a block with no buffers in use. Walk the buffer block
|
||
|
|
// removing each buffer from the pool's free list and freeing any
|
||
|
|
// associated NDIS_BUFFER descriptor.
|
||
|
|
//
|
||
|
|
for (i = 0, pHead = (BUFFERHEAD* )(pBlock + 1);
|
||
|
|
i < pBlock->ulBuffers;
|
||
|
|
++i, pHead = (BUFFERHEAD* )
|
||
|
|
(((CHAR* )(pHead + 1)) + pPool->ulBufferSize))
|
||
|
|
{
|
||
|
|
RemoveEntryList( &pHead->linkFreeBuffers );
|
||
|
|
|
||
|
|
if (pHead->pNdisBuffer)
|
||
|
|
{
|
||
|
|
NdisFreeBuffer( pHead->pNdisBuffer );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#else // Assume some buffers may not be free at time of call.
|
||
|
|
|
||
|
|
LIST_ENTRY* pLink2;
|
||
|
|
|
||
|
|
// Found a block with no buffers in use. Walk the pool's free
|
||
|
|
// list looking for buffers from this block.
|
||
|
|
//
|
||
|
|
TRACE( TL_A, TM_Pool, ( "FreeBpBlock(%d-%d)",
|
||
|
|
pPool->ulCurBuffers, pPool->ulBuffersPerBlock ) );
|
||
|
|
|
||
|
|
pLink2 = pPool->listFreeBuffers.Flink;
|
||
|
|
while (pLink2 != &pPool->listFreeBuffers)
|
||
|
|
{
|
||
|
|
LIST_ENTRY* pLink2Next;
|
||
|
|
BUFFERHEAD* pHead;
|
||
|
|
|
||
|
|
pLink2Next = pLink2->Flink;
|
||
|
|
|
||
|
|
pHead = CONTAINING_RECORD( pLink2, BUFFERHEAD, linkFreeBuffers );
|
||
|
|
if (pHead->pBlock == pBlock)
|
||
|
|
{
|
||
|
|
// Found a buffer from the unused block. Remove it.
|
||
|
|
//
|
||
|
|
RemoveEntryList( pLink2 );
|
||
|
|
--pBlock->ulFreeBuffers;
|
||
|
|
|
||
|
|
if (pHead->pNdisBuffer)
|
||
|
|
{
|
||
|
|
NdisFreeBuffer( pHead->pNdisBuffer );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pLink2 = pLink2Next;
|
||
|
|
}
|
||
|
|
|
||
|
|
ASSERT( pBlock->ulFreeBuffers == 0 );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// Remove and release the unused block.
|
||
|
|
//
|
||
|
|
RemoveEntryList( pLink );
|
||
|
|
pPool->ulCurBuffers -= pBlock->ulBuffers;
|
||
|
|
|
||
|
|
if (pBlock->hNdisPool)
|
||
|
|
{
|
||
|
|
NdisFreeBufferPool( pBlock->hNdisPool );
|
||
|
|
}
|
||
|
|
|
||
|
|
FREE_NONPAGED( pBlock );
|
||
|
|
}
|
||
|
|
|
||
|
|
pLink = pLinkNext;
|
||
|
|
}
|
||
|
|
}
|