PDMNetShaper.cpp@ 100746

Last change on this file since 100746 was 99739, checked in by vboxsync, 20 months ago
*: doxygen corrections (mostly about removing @returns from functions returning void).
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1	/* $Id: PDMNetShaper.cpp 99739 2023-05-11 01:01:08Z vboxsync $ */
2	/** @file
3	* PDM Network Shaper - Limit network traffic according to bandwidth group settings.
4	*/
5
6	/*
7	* Copyright (C) 2011-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_NET_SHAPER
33	#include <VBox/vmm/pdm.h>
34	#include "PDMInternal.h"
35	#include <VBox/vmm/vm.h>
36	#include <VBox/vmm/uvm.h>
37	#include <VBox/err.h>
38
39	#include <VBox/log.h>
40	#include <iprt/asm.h>
41	#include <iprt/assert.h>
42	#include <iprt/critsect.h>
43	#include <iprt/string.h>
44	#include <iprt/semaphore.h>
45	#include <iprt/thread.h>
46
47	#include <VBox/vmm/pdmnetshaper.h>
48
49
50
51
52	/**
53	* Looks up a network bandwidth group by it's name.
54	*
55	* @returns Pointer to the group if found, NULL if not.
56	* @param pVM The cross context VM structure.
57	* @param pszName The name of the group to find.
58	*/
59	static PPDMNSBWGROUP pdmNsBwGroupFindByName(PVM pVM, const char *pszName)
60	{
61	AssertPtrReturn(pszName, NULL);
62	AssertReturn(*pszName != '\0', NULL);
63
64	size_t const cGroups = RT_MIN(pVM->pdm.s.cNsGroups, RT_ELEMENTS(pVM->pdm.s.aNsGroups));
65	for (size_t i = 0; i < cGroups; i++)
66	if (RTStrCmp(pVM->pdm.s.aNsGroups[i].szName, pszName) == 0)
67	return &pVM->pdm.s.aNsGroups[i];
68	return NULL;
69	}
70
71
72	#ifdef VBOX_STRICT
73	/**
74	* Checks if pFilter is attached to the given group by walking the list.
75	*/
76	DECLINLINE(bool) pdmR3NsIsFilterAttached(PPDMNSBWGROUP pGroup, PPDMNSFILTER pFilter)
77	{
78	PPDMNSFILTER pCur;
79	RTListForEach(&pGroup->FilterList, pCur, PDMNSFILTER, ListEntry)
80	{
81	if (pCur == pFilter)
82	return true;
83	}
84	return false;
85	}
86	#endif
87
88	/**
89	* Attaches a network filter driver to the named bandwidth group.
90	*
91	* @returns VBox status code.
92	* @retval VERR_ALREADY_INITIALIZED if already attached.
93	* @retval VERR_NOT_FOUND if the bandwidth wasn't found.
94	*
95	* @param pVM The cross context VM structure.
96	* @param pDrvIns The driver instance.
97	* @param pszName Name of the bandwidth group to attach to.
98	* @param pFilter Pointer to the filter to attach.
99	*/
100	VMMR3_INT_DECL(int) PDMR3NsAttach(PVM pVM, PPDMDRVINS pDrvIns, const char *pszName, PPDMNSFILTER pFilter)
101	{
102	/*
103	* Validate input.
104	*/
105	RT_NOREF(pDrvIns);
106	VM_ASSERT_EMT_RETURN(pVM, VERR_VM_THREAD_NOT_EMT);
107	AssertPtrReturn(pFilter, VERR_INVALID_POINTER);
108
109	uint32_t iGroup = pFilter->iGroup;
110	AssertMsgReturn(iGroup == 0, ("iGroup=%d\n", iGroup), VERR_ALREADY_INITIALIZED);
111	Assert(pFilter->ListEntry.pNext == NULL);
112	Assert(pFilter->ListEntry.pPrev == NULL);
113
114	/* Resolve the group. */
115	PPDMNSBWGROUP pGroup = pdmNsBwGroupFindByName(pVM, pszName);
116	AssertMsgReturn(pGroup, ("'%s'\n", pszName), VERR_NOT_FOUND);
117
118	/*
119	* The attach is protected by PDM::NsLock and by updating iGroup atomatically.
120	*/
121	int rc = RTCritSectEnter(&pVM->pdm.s.NsLock);
122	if (RT_SUCCESS(rc))
123	{
124	if (ASMAtomicCmpXchgU32(&pFilter->iGroup, (uint32_t)(pGroup - &pVM->pdm.s.aNsGroups[0]) + 1, 0))
125	{
126	Assert(pFilter->ListEntry.pNext == NULL);
127	Assert(pFilter->ListEntry.pPrev == NULL);
128	RTListAppend(&pGroup->FilterList, &pFilter->ListEntry);
129
130	uint32_t cRefs = ASMAtomicIncU32(&pGroup->cRefs);
131	AssertMsg(cRefs > 0 && cRefs < _16K, ("%u\n", cRefs));
132	RT_NOREF_PV(cRefs);
133
134	LogFlow(("PDMR3NsAttach: Attached '%s'/%u to %s (cRefs=%u)\n",
135	pDrvIns->pReg->szName, pDrvIns->iInstance, pGroup->szName, cRefs));
136	rc = VINF_SUCCESS;
137	}
138	else
139	{
140	AssertMsgFailed(("iGroup=%d (attach race)\n", pFilter->iGroup));
141	rc = VERR_ALREADY_INITIALIZED;
142	}
143
144	int rc2 = RTCritSectLeave(&pVM->pdm.s.NsLock);
145	AssertRC(rc2);
146	}
147
148	return rc;
149	}
150
151
152	/**
153	* Detaches a network filter driver from its current bandwidth group (if any).
154	*
155	* @returns VBox status code.
156	* @param pVM The cross context VM structure.
157	* @param pDrvIns The driver instance.
158	* @param pFilter Pointer to the filter to detach.
159	*/
160	VMMR3_INT_DECL(int) PDMR3NsDetach(PVM pVM, PPDMDRVINS pDrvIns, PPDMNSFILTER pFilter)
161	{
162	/*
163	* Validate input.
164	*/
165	RT_NOREF(pDrvIns);
166	VM_ASSERT_EMT_RETURN(pVM, VERR_VM_THREAD_NOT_EMT);
167	AssertPtrReturn(pFilter, VERR_INVALID_POINTER);
168
169	/* Now, return quietly if the filter isn't attached since driver/device
170	destructors are called on constructor failure. */
171	uint32_t const iGroup = ASMAtomicUoReadU32(&pFilter->iGroup);
172	if (!iGroup)
173	return VINF_SUCCESS;
174	AssertMsgReturn(iGroup - 1 < RT_MIN(pVM->pdm.s.cNsGroups, RT_ELEMENTS(pVM->pdm.s.aNsGroups)), ("iGroup=%#x\n", iGroup),
175	VERR_INVALID_HANDLE);
176	PPDMNSBWGROUP const pGroup = &pVM->pdm.s.aNsGroups[iGroup - 1];
177
178	/*
179	* The detaching is protected by PDM::NsLock and by atomically updating iGroup.
180	*/
181	int rc = RTCritSectEnter(&pVM->pdm.s.NsLock);
182	if (RT_SUCCESS(rc))
183	{
184	if (ASMAtomicCmpXchgU32(&pFilter->iGroup, 0, iGroup))
185	{
186	Assert(pdmR3NsIsFilterAttached(pGroup, pFilter));
187	RTListNodeRemove(&pFilter->ListEntry);
188	Assert(pFilter->ListEntry.pNext == NULL);
189	Assert(pFilter->ListEntry.pPrev == NULL);
190	ASMAtomicWriteU32(&pFilter->iGroup, 0);
191
192	uint32_t cRefs = ASMAtomicDecU32(&pGroup->cRefs);
193	Assert(cRefs < _16K);
194	RT_NOREF_PV(cRefs);
195
196	LogFlow(("PDMR3NsDetach: Detached '%s'/%u from %s (cRefs=%u)\n",
197	pDrvIns->pReg->szName, pDrvIns->iInstance, pGroup->szName, cRefs));
198	rc = VINF_SUCCESS;
199	}
200	else
201	AssertFailedStmt(rc = VERR_WRONG_ORDER);
202
203	int rc2 = RTCritSectLeave(&pVM->pdm.s.NsLock);
204	AssertRC(rc2);
205	}
206	else
207	AssertRC(rc);
208	return rc;
209	}
210
211
212	/**
213	* This is used both by pdmR3NsUnchokeThread and PDMR3NsBwGroupSetLimit,
214	* the latter only when setting cbPerSecMax to zero.
215	*
216	* @param pGroup The group which filters should be unchoked.
217	* @note Caller owns the PDM::NsLock critsect.
218	*/
219	static void pdmR3NsUnchokeGroupFilters(PPDMNSBWGROUP pGroup)
220	{
221	PPDMNSFILTER pFilter;
222	RTListForEach(&pGroup->FilterList, pFilter, PDMNSFILTER, ListEntry)
223	{
224	bool fChoked = ASMAtomicXchgBool(&pFilter->fChoked, false);
225	if (fChoked)
226	{
227	PPDMINETWORKDOWN pIDrvNet = pFilter->pIDrvNetR3;
228	if (pIDrvNet && pIDrvNet->pfnXmitPending != NULL)
229	{
230	Log3(("pdmR3NsUnchokeGroupFilters: Unchoked %p in %s, calling %p\n",
231	pFilter, pGroup->szName, pIDrvNet->pfnXmitPending));
232	pIDrvNet->pfnXmitPending(pIDrvNet);
233	}
234	else
235	Log3(("pdmR3NsUnchokeGroupFilters: Unchoked %p in %s (no callback)\n", pFilter, pGroup->szName));
236	}
237	}
238	}
239
240
241	/**
242	* Worker for PDMR3NsBwGroupSetLimit and pdmR3NetShaperInit.
243	*
244	* @returns New bucket size.
245	* @param pGroup The group to update.
246	* @param cbPerSecMax The new max bytes per second.
247	*/
248	static uint32_t pdmNsBwGroupSetLimit(PPDMNSBWGROUP pGroup, uint64_t cbPerSecMax)
249	{
250	uint32_t const cbRet = RT_MAX(PDM_NETSHAPER_MIN_BUCKET_SIZE, cbPerSecMax * PDM_NETSHAPER_MAX_LATENCY / RT_MS_1SEC);
251	pGroup->cbBucket = cbRet;
252	pGroup->cbPerSecMax = cbPerSecMax;
253	LogFlow(("pdmNsBwGroupSetLimit: New rate limit is %#RX64 bytes per second, adjusted bucket size to %#x bytes\n",
254	cbPerSecMax, cbRet));
255	return cbRet;
256	}
257
258
259	/**
260	* Adjusts the maximum rate for the bandwidth group.
261	*
262	* @returns VBox status code.
263	* @param pUVM The user mode VM handle.
264	* @param pszName Name of the bandwidth group to attach to.
265	* @param cbPerSecMax Maximum number of bytes per second to be transmitted.
266	*/
267	VMMR3DECL(int) PDMR3NsBwGroupSetLimit(PUVM pUVM, const char *pszName, uint64_t cbPerSecMax)
268	{
269	/*
270	* Validate input.
271	*/
272	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
273	PVM const pVM = pUVM->pVM;
274	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
275
276	int rc;
277	PPDMNSBWGROUP pGroup = pdmNsBwGroupFindByName(pVM, pszName);
278	if (pGroup)
279	{
280	/*
281	* Lock the group while we effect the changes.
282	*/
283	rc = PDMCritSectEnter(pVM, &pGroup->Lock, VERR_IGNORED);
284	if (RT_SUCCESS(rc))
285	{
286	uint32_t const cbBucket = pdmNsBwGroupSetLimit(pGroup, cbPerSecMax);
287
288	/* Drop extra tokens */
289	if (pGroup->cbTokensLast > cbBucket)
290	pGroup->cbTokensLast = cbBucket;
291	Log(("PDMR3NsBwGroupSetLimit/%s: cbBucket=%#x cbPerSecMax=%#RX64\n", pGroup->szName, cbBucket, cbPerSecMax));
292
293	int rc2 = PDMCritSectLeave(pVM, &pGroup->Lock);
294	AssertRC(rc2);
295
296	/*
297	* If we disabled the group, we must make sure to unchoke all filter
298	* as the thread will ignore the group from now on.
299	*
300	* We do this after leaving the group lock to keep the locking simple.
301	* Extra pfnXmitPending calls should be harmless, of course ASSUMING
302	* nobody take offence to being called on this thread.
303	*/
304	if (cbPerSecMax == 0)
305	{
306	Log(("PDMR3NsBwGroupSetLimit: cbPerSecMax was set to zero, so unchoking filters...\n"));
307	rc = RTCritSectEnter(&pVM->pdm.s.NsLock);
308	AssertRC(rc);
309
310	pdmR3NsUnchokeGroupFilters(pGroup);
311
312	rc2 = RTCritSectLeave(&pVM->pdm.s.NsLock);
313	AssertRC(rc2);
314	}
315	}
316	else
317	AssertRC(rc);
318	}
319	else
320	rc = VERR_NOT_FOUND;
321	return rc;
322	}
323
324
325	/**
326	* I/O thread for pending unchoking and associating transmitting.
327	*
328	* @returns VINF_SUCCESS (ignored).
329	* @param pVM The cross context VM structure.
330	* @param pThread The PDM thread data.
331	*/
332	static DECLCALLBACK(int) pdmR3NsUnchokeThread(PVM pVM, PPDMTHREAD pThread)
333	{
334	LogFlow(("pdmR3NsUnchokeThread: pVM=%p\n", pVM));
335	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
336	{
337	int rc = RTSemEventWait(pVM->pdm.s.hNsUnchokeEvt, RT_INDEFINITE_WAIT);
338	if (pThread->enmState != PDMTHREADSTATE_RUNNING)
339	break;
340	AssertMsgStmt(RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT /* paranioa*/, ("%Rrc\n", rc),
341	RTThreadSleep(PDM_NETSHAPER_MAX_LATENCY));
342
343	/*
344	* Go over all bandwidth groups/filters and unchoke their filters.
345	*
346	* We take the main lock here to prevent any detaching or attaching
347	* from taking place while we're traversing the filter lists.
348	*/
349	rc = RTCritSectEnter(&pVM->pdm.s.NsLock);
350	AssertRC(rc);
351
352	size_t const cGroups = RT_MIN(pVM->pdm.s.cNsGroups, RT_ELEMENTS(pVM->pdm.s.aNsGroups));
353	for (size_t i = 0; i < cGroups; i++)
354	{
355	PPDMNSBWGROUP const pGroup = &pVM->pdm.s.aNsGroups[i];
356	if ( pGroup->cRefs > 0
357	&& pGroup->cbPerSecMax > 0)
358	pdmR3NsUnchokeGroupFilters(pGroup);
359	}
360
361	rc = RTCritSectLeave(&pVM->pdm.s.NsLock);
362	AssertRC(rc);
363	}
364	return VINF_SUCCESS;
365	}
366
367
368	/**
369	* @copydoc FNPDMTHREADWAKEUPINT
370	*/
371	static DECLCALLBACK(int) pdmR3NsUnchokeWakeUp(PVM pVM, PPDMTHREAD pThread)
372	{
373	LogFlow(("pdmR3NsUnchokeWakeUp:\n"));
374
375	/* Wake up the thread. */
376	int rc = RTSemEventSignal(pVM->pdm.s.hNsUnchokeEvt);
377	AssertRC(rc);
378
379	RT_NOREF(pThread);
380	return VINF_SUCCESS;
381	}
382
383
384	/**
385	* @callback_method_impl{FNTMTIMERINT, Wakes up pdmR3NsUnchokeThread.}
386	*/
387	static DECLCALLBACK(void) pdmR3NsUnchokeTimer(PVM pVM, TMTIMERHANDLE hTimer, void *pvUser)
388	{
389	ASMAtomicWriteBool(&pVM->pdm.s.fNsUnchokeTimerArmed, false);
390
391	/* Wake up the thread. */
392	int rc = RTSemEventSignal(pVM->pdm.s.hNsUnchokeEvt);
393	AssertRC(rc);
394
395	RT_NOREF(hTimer, pvUser);
396	}
397
398
399	/**
400	* Terminate the network shaper, groups, lock and everything.
401	*
402	* @param pVM The cross context VM structure.
403	*/
404	void pdmR3NetShaperTerm(PVM pVM)
405	{
406	size_t const cGroups = RT_MIN(pVM->pdm.s.cNsGroups, RT_ELEMENTS(pVM->pdm.s.aNsGroups));
407	for (size_t i = 0; i < cGroups; i++)
408	{
409	PPDMNSBWGROUP const pGroup = &pVM->pdm.s.aNsGroups[i];
410	AssertMsg(pGroup->cRefs == 0, ("cRefs=%s '%s'\n", pGroup->cRefs, pGroup->szName));
411	AssertContinue(PDMCritSectIsInitialized(&pGroup->Lock));
412	PDMR3CritSectDelete(pVM, &pGroup->Lock);
413	}
414
415	RTCritSectDelete(&pVM->pdm.s.NsLock);
416	}
417
418
419	/**
420	* Initialize the network shaper.
421	*
422	* @returns VBox status code
423	* @param pVM The cross context VM structure.
424	*/
425	int pdmR3NetShaperInit(PVM pVM)
426	{
427	LogFlow(("pdmR3NetShaperInit: pVM=%p\n", pVM));
428	VM_ASSERT_EMT(pVM);
429
430	Assert(pVM->pdm.s.cNsGroups == 0);
431	pVM->pdm.s.hNsUnchokeEvt = NIL_RTSEMEVENT;
432	pVM->pdm.s.hNsUnchokeTimer = NIL_TMTIMERHANDLE;
433
434	/*
435	* Initialize the critical section protecting attaching, detaching and unchoking.
436	*
437	* This is a non-recursive lock to make sure nobody tries to mess with the groups
438	* from the pfnXmitPending callback.
439	*/
440	int rc = RTCritSectInitEx(&pVM->pdm.s.NsLock, RTCRITSECT_FLAGS_NO_NESTING,
441	NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE, "PDMNetShaper");
442	AssertRCReturn(rc, rc);
443
444	/*
445	* Initialize all bandwidth groups.
446	*/
447	PCFGMNODE pCfgNetShaper = CFGMR3GetChild(CFGMR3GetChild(CFGMR3GetRoot(pVM), "PDM"), "NetworkShaper");
448	PCFGMNODE pCfgBwGrp = CFGMR3GetChild(pCfgNetShaper, "BwGroups");
449	if (pCfgBwGrp)
450	{
451	uint32_t iGroup = 0;
452	for (PCFGMNODE pCur = CFGMR3GetFirstChild(pCfgBwGrp); pCur; pCur = CFGMR3GetNextChild(pCur))
453	{
454	/*
455	* Get the config data.
456	*/
457	size_t cchName = CFGMR3GetNameLen(pCur);
458	AssertBreakStmt(cchName <= PDM_NET_SHAPER_MAX_NAME_LEN,
459	rc = VMR3SetError(pVM->pUVM, VERR_INVALID_NAME, RT_SRC_POS,
460	N_("Network shaper group name #%u is too long: %zu, max %u"),
461	iGroup, cchName, PDM_NET_SHAPER_MAX_NAME_LEN));
462	char szName[PDM_NET_SHAPER_MAX_NAME_LEN + 1];
463	rc = CFGMR3GetName(pCur, szName, sizeof(szName));
464	AssertRCBreak(rc);
465	AssertBreakStmt(szName[0] != '\0',
466	rc = VMR3SetError(pVM->pUVM, VERR_INVALID_NAME, RT_SRC_POS,
467	N_("Empty network shaper group name #%u"), iGroup));
468
469	uint64_t cbMax;
470	rc = CFGMR3QueryU64(pCur, "Max", &cbMax);
471	AssertRCBreakStmt(rc, rc = VMR3SetError(pVM->pUVM, rc, RT_SRC_POS,
472	N_("Failed to read 'Max' value for network shaper group '%s': %Rrc"),
473	szName, rc));
474
475	/*
476	* Initialize the group table entry.
477	*/
478	AssertBreakStmt(iGroup < RT_ELEMENTS(pVM->pdm.s.aNsGroups),
479	rc = VMR3SetError(pVM->pUVM, VERR_TOO_MUCH_DATA, RT_SRC_POS, N_("Too many bandwidth groups (max %zu)"),
480	RT_ELEMENTS(pVM->pdm.s.aNsGroups)));
481
482	rc = PDMR3CritSectInit(pVM, &pVM->pdm.s.aNsGroups[iGroup].Lock, RT_SRC_POS, "BWGRP%02u-%s", iGroup, szName);
483	AssertRCBreak(rc);
484
485	RTListInit(&pVM->pdm.s.aNsGroups[iGroup].FilterList);
486	pVM->pdm.s.aNsGroups[iGroup].cRefs = 0;
487	RTStrCopy(pVM->pdm.s.aNsGroups[iGroup].szName, sizeof(pVM->pdm.s.aNsGroups[iGroup].szName), szName);
488	pVM->pdm.s.aNsGroups[iGroup].cbTokensLast = pdmNsBwGroupSetLimit(&pVM->pdm.s.aNsGroups[iGroup], cbMax);
489	pVM->pdm.s.aNsGroups[iGroup].tsUpdatedLast = RTTimeSystemNanoTS();
490	LogFlowFunc(("PDM NetShaper Group #%u: %s - cbPerSecMax=%#RU64 cbBucket=%#x\n",
491	iGroup, pVM->pdm.s.aNsGroups[iGroup].szName, pVM->pdm.s.aNsGroups[iGroup].cbPerSecMax,
492	pVM->pdm.s.aNsGroups[iGroup].cbBucket));
493
494	/*
495	* Register statistics.
496	*/
497	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].cbPerSecMax, STAMTYPE_U64, STAMVISIBILITY_ALWAYS,
498	STAMUNIT_BYTES, "", "/PDM/NetShaper/%u-%s/cbPerSecMax", iGroup, szName);
499	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].cRefs, STAMTYPE_U32, STAMVISIBILITY_ALWAYS,
500	STAMUNIT_BYTES, "", "/PDM/NetShaper/%u-%s/cRefs", iGroup, szName);
501	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].cbBucket, STAMTYPE_U32, STAMVISIBILITY_ALWAYS,
502	STAMUNIT_BYTES, "", "/PDM/NetShaper/%u-%s/cbBucket", iGroup, szName);
503	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].cbTokensLast, STAMTYPE_U32, STAMVISIBILITY_ALWAYS,
504	STAMUNIT_BYTES, "", "/PDM/NetShaper/%u-%s/cbTokensLast", iGroup, szName);
505	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].tsUpdatedLast, STAMTYPE_U64, STAMVISIBILITY_ALWAYS,
506	STAMUNIT_NS, "", "/PDM/NetShaper/%u-%s/tsUpdatedLast", iGroup, szName);
507	STAMR3RegisterF(pVM, (void *)&pVM->pdm.s.aNsGroups[iGroup].cTotalChokings, STAMTYPE_U64_RESET, STAMVISIBILITY_ALWAYS,
508	STAMUNIT_OCCURENCES, "", "/PDM/NetShaper/%u-%s/TotalChokings", iGroup, szName);
509
510	pVM->pdm.s.cNsGroups = ++iGroup;
511	}
512	}
513	if (RT_SUCCESS(rc))
514	{
515	/*
516	* If there are any groups configured, create a unchoke thread and an
517	* associated timer for waking it up when needed. The timer runs on
518	* the real time clock.
519	*/
520	if (pVM->pdm.s.cNsGroups == 0)
521	{
522	LogFlowFunc(("returns VINF_SUCCESS - no groups\n"));
523	return VINF_SUCCESS;
524	}
525
526	rc = RTSemEventCreate(&pVM->pdm.s.hNsUnchokeEvt);
527	if (RT_SUCCESS(rc))
528	{
529	rc = TMR3TimerCreate(pVM, TMCLOCK_REAL, pdmR3NsUnchokeTimer, NULL, TMTIMER_FLAGS_NO_RING0,
530	"PDMNetShaperUnchoke", &pVM->pdm.s.hNsUnchokeTimer);
531	if (RT_SUCCESS(rc))
532	{
533	rc = PDMR3ThreadCreate(pVM, &pVM->pdm.s.pNsUnchokeThread, NULL, pdmR3NsUnchokeThread, pdmR3NsUnchokeWakeUp,
534	0 /cbStack/, RTTHREADTYPE_IO, "PDMNsUnchoke");
535	if (RT_SUCCESS(rc))
536	{
537
538	LogFlowFunc(("returns VINF_SUCCESS (%u groups)\n", pVM->pdm.s.cNsGroups));
539	return VINF_SUCCESS;
540	}
541	}
542	}
543	}
544
545	RTCritSectDelete(&pVM->pdm.s.NsLock);
546	LogRel(("pdmR3NetShaperInit: failed rc=%Rrc\n", rc));
547	return rc;
548	}
549

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source: vbox/trunk/src/VBox/VMM/VMMR3/PDMNetShaper.cpp@ 100746

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