| 1 | /* $Id: PDMAllNetShaper.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PDM Network Shaper - Limit network traffic according to bandwidth group settings.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_NET_SHAPER
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| 33 | #include <VBox/vmm/pdmnetshaper.h>
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| 34 | #include "PDMInternal.h"
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| 35 | #include <VBox/vmm/vmcc.h>
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| 36 |
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| 37 | #include <VBox/log.h>
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| 38 | #include <iprt/time.h>
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| 39 | #include <iprt/asm-math.h>
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * Obtain bandwidth in a bandwidth group.
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| 44 | *
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| 45 | * @returns True if bandwidth was allocated, false if not.
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| 46 | * @param pVM The cross context VM structure.
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| 47 | * @param pFilter Pointer to the filter that allocates bandwidth.
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| 48 | * @param cbTransfer Number of bytes to allocate.
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| 49 | */
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| 50 | VMM_INT_DECL(bool) PDMNetShaperAllocateBandwidth(PVMCC pVM, PPDMNSFILTER pFilter, size_t cbTransfer)
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| 51 | {
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| 52 | AssertPtrReturn(pFilter, true);
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| 53 |
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| 54 | /*
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| 55 | * If we haven't got a valid bandwidth group, we always allow the traffic.
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| 56 | */
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| 57 | bool fAllowed = true;
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| 58 | uint32_t iGroup = ASMAtomicUoReadU32(&pFilter->iGroup);
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| 59 | if (iGroup != 0)
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| 60 | {
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| 61 | if (iGroup <= RT_MIN(pVM->pdm.s.cNsGroups, RT_ELEMENTS(pVM->pdm.s.aNsGroups)))
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| 62 | {
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| 63 | PPDMNSBWGROUP pGroup = &pVM->pdm.s.aNsGroups[iGroup - 1];
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| 64 | int rc = PDMCritSectEnter(pVM, &pGroup->Lock, VINF_TRY_AGAIN);
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| 65 | if (rc == VINF_SUCCESS)
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| 66 | {
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| 67 | uint64_t const cbPerSecMax = pGroup->cbPerSecMax;
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| 68 | if (cbPerSecMax > 0)
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| 69 | {
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| 70 | /*
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| 71 | * Re-fill the bucket first
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| 72 | *
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| 73 | * Note! We limit the cTokensAdded calculation to 1 second, since it's really
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| 74 | * pointless to calculate much beyond PDM_NETSHAPER_MAX_LATENCY (100ms)
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| 75 | * let alone 1 sec. This makes it possible to use ASMMultU64ByU32DivByU32
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| 76 | * as the cNsDelta is less than 30 bits wide now, which means we don't get
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| 77 | * into overflow issues when multiplying two 64-bit values.
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| 78 | */
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| 79 | uint64_t const nsNow = RTTimeSystemNanoTS();
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| 80 | uint64_t const cNsDelta = nsNow - pGroup->tsUpdatedLast;
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| 81 | uint64_t const cTokensAdded = cNsDelta < RT_NS_1SEC
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| 82 | ? ASMMultU64ByU32DivByU32(cbPerSecMax, (uint32_t)cNsDelta, RT_NS_1SEC)
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| 83 | : cbPerSecMax;
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| 84 | uint32_t const cbBucket = pGroup->cbBucket;
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| 85 | uint32_t const cbTokensLast = pGroup->cbTokensLast;
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| 86 | uint32_t const cTokens = (uint32_t)RT_MIN(cbBucket, cTokensAdded + cbTokensLast);
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| 87 |
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| 88 | /*
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| 89 | * Allowed?
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| 90 | */
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| 91 | if (cbTransfer <= cTokens)
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| 92 | {
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| 93 | pGroup->cbTokensLast = cTokens - (uint32_t)cbTransfer;
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| 94 | pGroup->tsUpdatedLast = nsNow;
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| 95 | Log2(("pdmNsAllocateBandwidth/%s: allowed - cbTransfer=%#zx cTokens=%#x cTokensAdded=%#x\n",
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| 96 | pGroup->szName, cbTransfer, cTokens, cTokensAdded));
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| 97 | }
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| 98 | else
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| 99 | {
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| 100 | /*
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| 101 | * No, we're choked. Arm the unchoke timer for the next period.
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| 102 | * Just do this on a simple PDM_NETSHAPER_MAX_LATENCY clock granularity.
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| 103 | * ASSUMES the timer uses millisecond resolution clock.
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| 104 | */
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| 105 | ASMAtomicWriteBool(&pFilter->fChoked, true);
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| 106 | if (ASMAtomicCmpXchgBool(&pVM->pdm.s.fNsUnchokeTimerArmed, true, false))
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| 107 | {
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| 108 | Assert(TMTimerGetFreq(pVM, pVM->pdm.s.hNsUnchokeTimer) == RT_MS_1SEC);
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| 109 | uint64_t const msNow = TMTimerGet(pVM, pVM->pdm.s.hNsUnchokeTimer);
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| 110 | uint64_t const msExpire = (msNow / PDM_NETSHAPER_MAX_LATENCY + 1) * PDM_NETSHAPER_MAX_LATENCY;
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| 111 | rc = TMTimerSet(pVM, pVM->pdm.s.hNsUnchokeTimer, msExpire);
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| 112 | AssertRC(rc);
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| 113 |
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| 114 | Log2(("pdmNsAllocateBandwidth/%s: refused - cbTransfer=%#zx cTokens=%#x cTokensAdded=%#x cMsExpire=%u\n",
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| 115 | pGroup->szName, cbTransfer, cTokens, cTokensAdded, msExpire - msNow));
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| 116 | }
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| 117 | else
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| 118 | Log2(("pdmNsAllocateBandwidth/%s: refused - cbTransfer=%#zx cTokens=%#x cTokensAdded=%#x\n",
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| 119 | pGroup->szName, cbTransfer, cTokens, cTokensAdded));
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| 120 | ASMAtomicIncU64(&pGroup->cTotalChokings);
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| 121 | fAllowed = false;
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| 122 | }
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| 123 | }
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| 124 | else
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| 125 | Log2(("pdmNsAllocateBandwidth/%s: disabled\n", pGroup->szName));
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| 126 |
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| 127 | rc = PDMCritSectLeave(pVM, &pGroup->Lock);
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| 128 | AssertRCSuccess(rc);
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| 129 | }
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| 130 | else if (rc == VINF_TRY_AGAIN) /* (accounted for by the critsect stats) */
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| 131 | Log2(("pdmNsAllocateBandwidth/%s: allowed - lock contention\n", pGroup->szName));
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| 132 | else
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| 133 | PDM_CRITSECT_RELEASE_ASSERT_RC(pVM, &pGroup->Lock, rc);
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| 134 | }
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| 135 | else
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| 136 | AssertMsgFailed(("Invalid iGroup=%d\n", iGroup));
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| 137 | }
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| 138 | return fAllowed;
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| 139 | }
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