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/* $Id: pdmnetshaperint.h $ */
/** @file
* PDM Network Shaper - Internal data structures and functions common for both
* R0 and R3 parts.
*/
/*
* Copyright (C) 2011-2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/**
* Bandwidth group instance data
*/
typedef struct PDMNSBWGROUP
{
/** Pointer to the next group in the list. */
struct PDMNSBWGROUP *pNext;
/** Pointer to the shared UVM structure. */
struct PDMNETSHAPER *pShaper;
/** Critical section protecting all members below. */
PDMCRITSECT cs;
/** Pointer to the first filter attached to this group. */
struct PDMNSFILTER *pFiltersHead;
/** Bandwidth group name. */
char *pszName;
/** Maximum number of bytes filters are allowed to transfer. */
volatile uint64_t cbTransferPerSecMax;
/** Number of bytes we are allowed to transfer in one burst. */
volatile uint32_t cbBucketSize;
/** Number of bytes we were allowed to transfer at the last update. */
volatile uint32_t cbTokensLast;
/** Timestamp of the last update */
volatile uint64_t tsUpdatedLast;
/** Reference counter - How many filters are associated with this group. */
volatile uint32_t cRefs;
} PDMNSBWGROUP;
/** Pointer to a bandwidth group. */
typedef PDMNSBWGROUP *PPDMNSBWGROUP;
DECLINLINE(bool) pdmNsAllocateBandwidth(PPDMNSFILTER pFilter, size_t cbTransfer)
{
AssertPtrReturn(pFilter, true);
if (!VALID_PTR(pFilter->CTX_SUFF(pBwGroup)))
return true;
PPDMNSBWGROUP pBwGroup = ASMAtomicReadPtrT(&pFilter->CTX_SUFF(pBwGroup), PPDMNSBWGROUP);
int rc = PDMCritSectEnter(&pBwGroup->cs, VERR_SEM_BUSY); AssertRC(rc);
if (RT_UNLIKELY(rc == VERR_SEM_BUSY))
return true;
bool fAllowed = true;
if (pBwGroup->cbTransferPerSecMax)
{
/* Re-fill the bucket first */
uint64_t tsNow = RTTimeSystemNanoTS();
uint32_t uTokensAdded = (tsNow - pBwGroup->tsUpdatedLast)*pBwGroup->cbTransferPerSecMax/(1000*1000*1000);
uint32_t uTokens = RT_MIN(pBwGroup->cbBucketSize, uTokensAdded + pBwGroup->cbTokensLast);
if (cbTransfer > uTokens)
{
fAllowed = false;
ASMAtomicWriteBool(&pFilter->fChoked, true);
}
else
{
pBwGroup->tsUpdatedLast = tsNow;
pBwGroup->cbTokensLast = uTokens - (uint32_t)cbTransfer;
}
Log2((LOG_FN_FMT "BwGroup=%#p{%s} cbTransfer=%u uTokens=%u uTokensAdded=%u fAllowed=%RTbool\n",
__PRETTY_FUNCTION__, pBwGroup, pBwGroup->pszName, cbTransfer, uTokens, uTokensAdded, fAllowed));
}
else
Log2((LOG_FN_FMT "BwGroup=%#p{%s} disabled fAllowed=%RTbool\n",
__PRETTY_FUNCTION__, pBwGroup, pBwGroup->pszName, fAllowed));
rc = PDMCritSectLeave(&pBwGroup->cs); AssertRC(rc);
return fAllowed;
}
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