PDMNetShaper.cpp@ 45733

Last change on this file since 45733 was 45061, checked in by vboxsync, 12 years ago
Review of PDM driver destructors making sure that variables they use are correctly initialized in the constructor. Found several RTFileClose(0) cases.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 16.4 KB

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1	/* $Id: PDMNetShaper.cpp 45061 2013-03-18 14:09:03Z vboxsync $ */
2	/** @file
3	* PDM Network Shaper - Limit network traffic according to bandwidth group settings.
4	*/
5
6	/*
7	* Copyright (C) 2011-2013 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_NET_SHAPER
23	#include "PDMInternal.h"
24	#include <VBox/vmm/pdm.h>
25	#include <VBox/vmm/mm.h>
26	#ifdef VBOX_WITH_REM
27	# include <VBox/vmm/rem.h>
28	#endif
29	#include <VBox/vmm/vm.h>
30	#include <VBox/vmm/uvm.h>
31	#include <VBox/err.h>
32
33	#include <VBox/log.h>
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/thread.h>
37	#include <iprt/mem.h>
38	#include <iprt/critsect.h>
39	#include <iprt/tcp.h>
40	#include <iprt/path.h>
41	#include <iprt/string.h>
42
43	#include <VBox/vmm/pdmnetshaper.h>
44	#include "PDMNetShaperInternal.h"
45
46
47	/*******************************************************************************
48	* Structures and Typedefs *
49	*******************************************************************************/
50
51	/**
52	* Network shaper data. One instance per VM.
53	*/
54	typedef struct PDMNETSHAPER
55	{
56	/** Pointer to the VM. */
57	PVM pVM;
58	/** Critical section protecting all members below. */
59	RTCRITSECT Lock;
60	/** Pending TX thread. */
61	PPDMTHREAD pTxThread;
62	/** Pointer to the first bandwidth group. */
63	PPDMNSBWGROUP pBwGroupsHead;
64	} PDMNETSHAPER;
65
66
67	/** Takes the shaper lock (asserts but doesn't return or anything on
68	* failure). */
69	#define LOCK_NETSHAPER(a_pShaper) do { int rcShaper = RTCritSectEnter(&(a_pShaper)->Lock); AssertRC(rcShaper); } while (0)
70
71	/** Takes the shaper lock, returns + asserts on failure. */
72	#define LOCK_NETSHAPER_RETURN(a_pShaper) \
73	do { int rcShaper = RTCritSectEnter(&(a_pShaper)->Lock); AssertRCReturn(rcShaper, rcShaper); } while (0)
74
75	/** Releases the shaper lock (asserts on failure). */
76	#define UNLOCK_NETSHAPER(a_pShaper) do { int rcShaper = RTCritSectLeave(&(a_pShaper)->Lock); AssertRC(rcShaper); } while (0)
77
78
79
80
81	static PPDMNSBWGROUP pdmNsBwGroupFindById(PPDMNETSHAPER pShaper, const char *pszId)
82	{
83	PPDMNSBWGROUP pBwGroup = NULL;
84
85	if (RT_VALID_PTR(pszId))
86	{
87	LOCK_NETSHAPER(pShaper);
88
89	pBwGroup = pShaper->pBwGroupsHead;
90	while ( pBwGroup
91	&& RTStrCmp(pBwGroup->pszNameR3, pszId))
92	pBwGroup = pBwGroup->pNextR3;
93
94	UNLOCK_NETSHAPER(pShaper);
95	}
96
97	return pBwGroup;
98	}
99
100
101	static void pdmNsBwGroupLink(PPDMNSBWGROUP pBwGroup)
102	{
103	PPDMNETSHAPER pShaper = pBwGroup->pShaperR3;
104	LOCK_NETSHAPER(pShaper);
105
106	pBwGroup->pNextR3 = pShaper->pBwGroupsHead;
107	pShaper->pBwGroupsHead = pBwGroup;
108
109	UNLOCK_NETSHAPER(pShaper);
110	}
111
112
113	#if 0
114	static void pdmNsBwGroupUnlink(PPDMNSBWGROUP pBwGroup)
115	{
116	PPDMNETSHAPER pShaper = pBwGroup->pShaper;
117	LOCK_NETSHAPER(pShaper);
118
119	if (pBwGroup == pShaper->pBwGroupsHead)
120	pShaper->pBwGroupsHead = pBwGroup->pNext;
121	else
122	{
123	PPDMNSBWGROUP pPrev = pShaper->pBwGroupsHead;
124	while ( pPrev
125	&& pPrev->pNext != pBwGroup)
126	pPrev = pPrev->pNext;
127
128	AssertPtr(pPrev);
129	pPrev->pNext = pBwGroup->pNext;
130	}
131
132	UNLOCK_NETSHAPER(pShaper);
133	}
134	#endif
135
136
137	static void pdmNsBwGroupSetLimit(PPDMNSBWGROUP pBwGroup, uint64_t cbPerSecMax)
138	{
139	pBwGroup->cbPerSecMax = cbPerSecMax;
140	pBwGroup->cbBucket = RT_MAX(PDM_NETSHAPER_MIN_BUCKET_SIZE, cbPerSecMax * PDM_NETSHAPER_MAX_LATENCY / 1000);
141	LogFlow(("pdmNsBwGroupSetLimit: New rate limit is %llu bytes per second, adjusted bucket size to %u bytes\n",
142	pBwGroup->cbPerSecMax, pBwGroup->cbBucket));
143	}
144
145
146	static int pdmNsBwGroupCreate(PPDMNETSHAPER pShaper, const char *pszBwGroup, uint64_t cbPerSecMax)
147	{
148	LogFlow(("pdmNsBwGroupCreate: pShaper=%#p pszBwGroup=%#p{%s} cbPerSecMax=%llu\n", pShaper, pszBwGroup, pszBwGroup, cbPerSecMax));
149
150	AssertPtrReturn(pShaper, VERR_INVALID_POINTER);
151	AssertPtrReturn(pszBwGroup, VERR_INVALID_POINTER);
152	AssertReturn(*pszBwGroup != '\0', VERR_INVALID_PARAMETER);
153
154	int rc;
155	PPDMNSBWGROUP pBwGroup = pdmNsBwGroupFindById(pShaper, pszBwGroup);
156	if (!pBwGroup)
157	{
158	rc = MMHyperAlloc(pShaper->pVM, sizeof(PDMNSBWGROUP), 64,
159	MM_TAG_PDM_NET_SHAPER, (void **)&pBwGroup);
160	if (RT_SUCCESS(rc))
161	{
162	rc = PDMR3CritSectInit(pShaper->pVM, &pBwGroup->Lock, RT_SRC_POS, "BWGRP");
163	if (RT_SUCCESS(rc))
164	{
165	pBwGroup->pszNameR3 = MMR3HeapStrDup(pShaper->pVM, MM_TAG_PDM_NET_SHAPER, pszBwGroup);
166	if (pBwGroup->pszNameR3)
167	{
168	pBwGroup->pShaperR3 = pShaper;
169	pBwGroup->cRefs = 0;
170
171	pdmNsBwGroupSetLimit(pBwGroup, cbPerSecMax);
172
173	pBwGroup->cbTokensLast = pBwGroup->cbBucket;
174	pBwGroup->tsUpdatedLast = RTTimeSystemNanoTS();
175
176	LogFlowFunc(("pszBwGroup={%s} cbBucket=%u\n",
177	pszBwGroup, pBwGroup->cbBucket));
178	pdmNsBwGroupLink(pBwGroup);
179	return VINF_SUCCESS;
180	}
181	PDMR3CritSectDelete(&pBwGroup->Lock);
182	}
183	MMHyperFree(pShaper->pVM, pBwGroup);
184	}
185	else
186	rc = VERR_NO_MEMORY;
187	}
188	else
189	rc = VERR_ALREADY_EXISTS;
190
191	LogFlowFunc(("returns rc=%Rrc\n", rc));
192	return rc;
193	}
194
195
196	static void pdmNsBwGroupTerminate(PPDMNSBWGROUP pBwGroup)
197	{
198	Assert(pBwGroup->cRefs == 0);
199	if (PDMCritSectIsInitialized(&pBwGroup->Lock))
200	PDMR3CritSectDelete(&pBwGroup->Lock);
201	}
202
203
204	DECLINLINE(void) pdmNsBwGroupRef(PPDMNSBWGROUP pBwGroup)
205	{
206	ASMAtomicIncU32(&pBwGroup->cRefs);
207	}
208
209
210	DECLINLINE(void) pdmNsBwGroupUnref(PPDMNSBWGROUP pBwGroup)
211	{
212	Assert(pBwGroup->cRefs > 0);
213	ASMAtomicDecU32(&pBwGroup->cRefs);
214	}
215
216
217	static void pdmNsBwGroupXmitPending(PPDMNSBWGROUP pBwGroup)
218	{
219	/*
220	* We don't need to hold the bandwidth group lock to iterate over the list
221	* of filters since the filters are removed while the shaper lock is being
222	* held.
223	*/
224	AssertPtr(pBwGroup);
225	AssertPtr(pBwGroup->pShaperR3);
226	Assert(RTCritSectIsOwner(&pBwGroup->pShaperR3->Lock));
227	//LOCK_NETSHAPER(pShaper);
228
229	/* Check if the group is disabled. */
230	if (pBwGroup->cbPerSecMax == 0)
231	return;
232
233	PPDMNSFILTER pFilter = pBwGroup->pFiltersHeadR3;
234	while (pFilter)
235	{
236	bool fChoked = ASMAtomicXchgBool(&pFilter->fChoked, false);
237	Log3((LOG_FN_FMT ": pFilter=%#p fChoked=%RTbool\n", __PRETTY_FUNCTION__, pFilter, fChoked));
238	if (fChoked && pFilter->pIDrvNetR3)
239	{
240	LogFlowFunc(("Calling pfnXmitPending for pFilter=%#p\n", pFilter));
241	pFilter->pIDrvNetR3->pfnXmitPending(pFilter->pIDrvNetR3);
242	}
243
244	pFilter = pFilter->pNextR3;
245	}
246
247	//UNLOCK_NETSHAPER(pShaper);
248	}
249
250
251	static void pdmNsFilterLink(PPDMNSFILTER pFilter)
252	{
253	PPDMNSBWGROUP pBwGroup = pFilter->pBwGroupR3;
254	int rc = PDMCritSectEnter(&pBwGroup->Lock, VERR_SEM_BUSY); AssertRC(rc);
255
256	pFilter->pNextR3 = pBwGroup->pFiltersHeadR3;
257	pBwGroup->pFiltersHeadR3 = pFilter;
258
259	rc = PDMCritSectLeave(&pBwGroup->Lock); AssertRC(rc);
260	}
261
262
263	static void pdmNsFilterUnlink(PPDMNSFILTER pFilter)
264	{
265	PPDMNSBWGROUP pBwGroup = pFilter->pBwGroupR3;
266	/*
267	* We need to make sure we hold the shaper lock since pdmNsBwGroupXmitPending()
268	* does not hold the bandwidth group lock while iterating over the list
269	* of group's filters.
270	*/
271	AssertPtr(pBwGroup);
272	AssertPtr(pBwGroup->pShaperR3);
273	Assert(RTCritSectIsOwner(&pBwGroup->pShaperR3->Lock));
274	int rc = PDMCritSectEnter(&pBwGroup->Lock, VERR_SEM_BUSY); AssertRC(rc);
275
276	if (pFilter == pBwGroup->pFiltersHeadR3)
277	pBwGroup->pFiltersHeadR3 = pFilter->pNextR3;
278	else
279	{
280	PPDMNSFILTER pPrev = pBwGroup->pFiltersHeadR3;
281	while ( pPrev
282	&& pPrev->pNextR3 != pFilter)
283	pPrev = pPrev->pNextR3;
284
285	AssertPtr(pPrev);
286	pPrev->pNextR3 = pFilter->pNextR3;
287	}
288
289	rc = PDMCritSectLeave(&pBwGroup->Lock); AssertRC(rc);
290	}
291
292
293	/**
294	* Attach network filter driver from bandwidth group.
295	*
296	* @returns VBox status code.
297	* @param pVM Handle of VM.
298	* @param pDrvIns The driver instance.
299	* @param pszBwGroup Name of the bandwidth group to attach to.
300	* @param pFilter Pointer to the filter we attach.
301	*/
302	VMMR3_INT_DECL(int) PDMR3NsAttach(PUVM pUVM, PPDMDRVINS pDrvIns, const char *pszBwGroup, PPDMNSFILTER pFilter)
303	{
304	VM_ASSERT_EMT(pUVM->pVM);
305	AssertPtrReturn(pFilter, VERR_INVALID_POINTER);
306	AssertReturn(pFilter->pBwGroupR3 == NULL, VERR_ALREADY_EXISTS);
307
308	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
309	LOCK_NETSHAPER_RETURN(pShaper);
310
311	int rc = VINF_SUCCESS;
312	PPDMNSBWGROUP pBwGroupNew = NULL;
313	if (pszBwGroup)
314	{
315	pBwGroupNew = pdmNsBwGroupFindById(pShaper, pszBwGroup);
316	if (pBwGroupNew)
317	pdmNsBwGroupRef(pBwGroupNew);
318	else
319	rc = VERR_NOT_FOUND;
320	}
321
322	if (RT_SUCCESS(rc))
323	{
324	PPDMNSBWGROUP pBwGroupOld = ASMAtomicXchgPtrT(&pFilter->pBwGroupR3, pBwGroupNew, PPDMNSBWGROUP);
325	ASMAtomicWritePtr(&pFilter->pBwGroupR0, MMHyperR3ToR0(pUVM->pVM, pBwGroupNew));
326	if (pBwGroupOld)
327	pdmNsBwGroupUnref(pBwGroupOld);
328	pdmNsFilterLink(pFilter);
329	}
330
331	UNLOCK_NETSHAPER(pShaper);
332	return rc;
333	}
334
335
336	/**
337	* Detach network filter driver from bandwidth group.
338	*
339	* @returns VBox status code.
340	* @param pUVM The user mode VM handle.
341	* @param pDrvIns The driver instance.
342	* @param pFilter Pointer to the filter we detach.
343	*/
344	VMMR3_INT_DECL(int) PDMR3NsDetach(PUVM pUVM, PPDMDRVINS pDrvIns, PPDMNSFILTER pFilter)
345	{
346	VM_ASSERT_EMT(pUVM->pVM);
347	AssertPtrReturn(pFilter, VERR_INVALID_POINTER);
348	/* Now, return quietly if the filter isn't attached since driver/device
349	destructors are called on constructor failure. */
350	if (!pFilter->pBwGroupR3)
351	return VINF_SUCCESS;
352	AssertPtrReturn(pFilter->pBwGroupR3, VERR_INVALID_POINTER);
353
354	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
355	LOCK_NETSHAPER_RETURN(pShaper);
356
357	pdmNsFilterUnlink(pFilter);
358	PPDMNSBWGROUP pBwGroup = ASMAtomicXchgPtrT(&pFilter->pBwGroupR3, NULL, PPDMNSBWGROUP);
359	if (pBwGroup)
360	pdmNsBwGroupUnref(pBwGroup);
361
362	UNLOCK_NETSHAPER(pShaper);
363	return VINF_SUCCESS;
364	}
365
366
367	/**
368	* Adjusts the maximum rate for the bandwidth group.
369	*
370	* @returns VBox status code.
371	* @param pUVM The user mode VM handle.
372	* @param pszBwGroup Name of the bandwidth group to attach to.
373	* @param cbPerSecMax Maximum number of bytes per second to be transmitted.
374	*/
375	VMMR3DECL(int) PDMR3NsBwGroupSetLimit(PUVM pUVM, const char *pszBwGroup, uint64_t cbPerSecMax)
376	{
377	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
378	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
379	LOCK_NETSHAPER_RETURN(pShaper);
380
381	int rc;
382	PPDMNSBWGROUP pBwGroup = pdmNsBwGroupFindById(pShaper, pszBwGroup);
383	if (pBwGroup)
384	{
385	rc = PDMCritSectEnter(&pBwGroup->Lock, VERR_SEM_BUSY); AssertRC(rc);
386	if (RT_SUCCESS(rc))
387	{
388	pdmNsBwGroupSetLimit(pBwGroup, cbPerSecMax);
389
390	/* Drop extra tokens */
391	if (pBwGroup->cbTokensLast > pBwGroup->cbBucket)
392	pBwGroup->cbTokensLast = pBwGroup->cbBucket;
393
394	int rc2 = PDMCritSectLeave(&pBwGroup->Lock); AssertRC(rc2);
395	}
396	}
397	else
398	rc = VERR_NOT_FOUND;
399
400	UNLOCK_NETSHAPER(pShaper);
401	return rc;
402	}
403
404
405	/**
406	* I/O thread for pending TX.
407	*
408	* @returns VINF_SUCCESS (ignored).
409	* @param pVM Pointer to the VM.
410	* @param pThread The PDM thread data.
411	*/
412	static DECLCALLBACK(int) pdmR3NsTxThread(PVM pVM, PPDMTHREAD pThread)
413	{
414	PPDMNETSHAPER pShaper = (PPDMNETSHAPER)pThread->pvUser;
415	LogFlow(("pdmR3NsTxThread: pShaper=%p\n", pShaper));
416	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
417	{
418	RTThreadSleep(PDM_NETSHAPER_MAX_LATENCY);
419
420	/* Go over all bandwidth groups/filters calling pfnXmitPending */
421	LOCK_NETSHAPER(pShaper);
422	PPDMNSBWGROUP pBwGroup = pShaper->pBwGroupsHead;
423	while (pBwGroup)
424	{
425	pdmNsBwGroupXmitPending(pBwGroup);
426	pBwGroup = pBwGroup->pNextR3;
427	}
428	UNLOCK_NETSHAPER(pShaper);
429	}
430	return VINF_SUCCESS;
431	}
432
433
434	/**
435	* @copydoc FNPDMTHREADWAKEUPINT
436	*/
437	static DECLCALLBACK(int) pdmR3NsTxWakeUp(PVM pVM, PPDMTHREAD pThread)
438	{
439	PPDMNETSHAPER pShaper = (PPDMNETSHAPER)pThread->pvUser;
440	LogFlow(("pdmR3NsTxWakeUp: pShaper=%p\n", pShaper));
441	/* Nothing to do */
442	return VINF_SUCCESS;
443	}
444
445
446	/**
447	* Terminate the network shaper.
448	*
449	* @returns VBox error code.
450	* @param pVM Pointer to VM.
451	*
452	* @remarks This method destroys all bandwidth group objects.
453	*/
454	int pdmR3NetShaperTerm(PVM pVM)
455	{
456	PUVM pUVM = pVM->pUVM;
457	AssertPtrReturn(pUVM, VERR_INVALID_POINTER);
458	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
459	AssertPtrReturn(pShaper, VERR_INVALID_POINTER);
460
461	/* Destroy the bandwidth managers. */
462	PPDMNSBWGROUP pBwGroup = pShaper->pBwGroupsHead;
463	while (pBwGroup)
464	{
465	PPDMNSBWGROUP pFree = pBwGroup;
466	pBwGroup = pBwGroup->pNextR3;
467	pdmNsBwGroupTerminate(pFree);
468	MMR3HeapFree(pFree->pszNameR3);
469	MMHyperFree(pVM, pFree);
470	}
471
472	RTCritSectDelete(&pShaper->Lock);
473	return VINF_SUCCESS;
474	}
475
476
477	/**
478	* Initialize the network shaper.
479	*
480	* @returns VBox status code
481	* @param pVM Pointer to the VM.
482	*/
483	int pdmR3NetShaperInit(PVM pVM)
484	{
485	LogFlow(("pdmR3NetShaperInit: pVM=%p\n", pVM));
486	VM_ASSERT_EMT(pVM);
487	PUVM pUVM = pVM->pUVM;
488	AssertMsgReturn(!pUVM->pdm.s.pNetShaper, ("Network shaper was already initialized\n"), VERR_WRONG_ORDER);
489
490	PPDMNETSHAPER pShaper;
491	int rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_NET_SHAPER, sizeof(PDMNETSHAPER), (void **)&pShaper);
492	if (RT_SUCCESS(rc))
493	{
494	PCFGMNODE pCfgNetShaper = CFGMR3GetChild(CFGMR3GetChild(CFGMR3GetRoot(pVM), "PDM"), "NetworkShaper");
495
496	pShaper->pVM = pVM;
497	rc = RTCritSectInit(&pShaper->Lock);
498	if (RT_SUCCESS(rc))
499	{
500	/* Create all bandwidth groups. */
501	PCFGMNODE pCfgBwGrp = CFGMR3GetChild(pCfgNetShaper, "BwGroups");
502	if (pCfgBwGrp)
503	{
504	for (PCFGMNODE pCur = CFGMR3GetFirstChild(pCfgBwGrp); pCur; pCur = CFGMR3GetNextChild(pCur))
505	{
506	uint64_t cbMax;
507	size_t cbName = CFGMR3GetNameLen(pCur) + 1;
508	char pszBwGrpId = (char )RTMemAllocZ(cbName);
509
510	if (!pszBwGrpId)
511	{
512	rc = VERR_NO_MEMORY;
513	break;
514	}
515
516	rc = CFGMR3GetName(pCur, pszBwGrpId, cbName);
517	AssertRC(rc);
518
519	if (RT_SUCCESS(rc))
520	rc = CFGMR3QueryU64(pCur, "Max", &cbMax);
521	if (RT_SUCCESS(rc))
522	rc = pdmNsBwGroupCreate(pShaper, pszBwGrpId, cbMax);
523
524	RTMemFree(pszBwGrpId);
525
526	if (RT_FAILURE(rc))
527	break;
528	}
529	}
530
531	if (RT_SUCCESS(rc))
532	{
533	rc = PDMR3ThreadCreate(pVM, &pShaper->pTxThread, pShaper, pdmR3NsTxThread, pdmR3NsTxWakeUp,
534	0 /cbStack/, RTTHREADTYPE_IO, "PDMNsTx");
535	if (RT_SUCCESS(rc))
536	{
537	pUVM->pdm.s.pNetShaper = pShaper;
538	return VINF_SUCCESS;
539	}
540	}
541
542	RTCritSectDelete(&pShaper->Lock);
543	}
544
545	MMR3HeapFree(pShaper);
546	}
547
548	LogFlow(("pdmR3NetShaperInit: pVM=%p rc=%Rrc\n", pVM, rc));
549	return rc;
550	}
551

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source: vbox/trunk/src/VBox/VMM/VMMR3/PDMNetShaper.cpp@ 45733

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