PDMNetShaper.cpp@ 70520

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1	/* $Id: PDMNetShaper.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
2	/** @file
3	* PDM Network Shaper - Limit network traffic according to bandwidth group settings.
4	*/
5
6	/*
7	* Copyright (C) 2011-2017 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-%s", pszBwGroup);
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 pUVM The user mode VM structure.
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	RT_NOREF_PV(pDrvIns);
308
309	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
310	LOCK_NETSHAPER_RETURN(pShaper);
311
312	int rc = VINF_SUCCESS;
313	PPDMNSBWGROUP pBwGroupNew = NULL;
314	if (pszBwGroup)
315	{
316	pBwGroupNew = pdmNsBwGroupFindById(pShaper, pszBwGroup);
317	if (pBwGroupNew)
318	pdmNsBwGroupRef(pBwGroupNew);
319	else
320	rc = VERR_NOT_FOUND;
321	}
322
323	if (RT_SUCCESS(rc))
324	{
325	PPDMNSBWGROUP pBwGroupOld = ASMAtomicXchgPtrT(&pFilter->pBwGroupR3, pBwGroupNew, PPDMNSBWGROUP);
326	ASMAtomicWritePtr(&pFilter->pBwGroupR0, MMHyperR3ToR0(pUVM->pVM, pBwGroupNew));
327	if (pBwGroupOld)
328	pdmNsBwGroupUnref(pBwGroupOld);
329	pdmNsFilterLink(pFilter);
330	}
331
332	UNLOCK_NETSHAPER(pShaper);
333	return rc;
334	}
335
336
337	/**
338	* Detach network filter driver from bandwidth group.
339	*
340	* @returns VBox status code.
341	* @param pUVM The user mode VM handle.
342	* @param pDrvIns The driver instance.
343	* @param pFilter Pointer to the filter we detach.
344	*/
345	VMMR3_INT_DECL(int) PDMR3NsDetach(PUVM pUVM, PPDMDRVINS pDrvIns, PPDMNSFILTER pFilter)
346	{
347	RT_NOREF_PV(pDrvIns);
348	VM_ASSERT_EMT(pUVM->pVM);
349	AssertPtrReturn(pFilter, VERR_INVALID_POINTER);
350
351	/* Now, return quietly if the filter isn't attached since driver/device
352	destructors are called on constructor failure. */
353	if (!pFilter->pBwGroupR3)
354	return VINF_SUCCESS;
355	AssertPtrReturn(pFilter->pBwGroupR3, VERR_INVALID_POINTER);
356
357	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
358	LOCK_NETSHAPER_RETURN(pShaper);
359
360	pdmNsFilterUnlink(pFilter);
361	PPDMNSBWGROUP pBwGroup = ASMAtomicXchgPtrT(&pFilter->pBwGroupR3, NULL, PPDMNSBWGROUP);
362	if (pBwGroup)
363	pdmNsBwGroupUnref(pBwGroup);
364
365	UNLOCK_NETSHAPER(pShaper);
366	return VINF_SUCCESS;
367	}
368
369
370	/**
371	* Adjusts the maximum rate for the bandwidth group.
372	*
373	* @returns VBox status code.
374	* @param pUVM The user mode VM handle.
375	* @param pszBwGroup Name of the bandwidth group to attach to.
376	* @param cbPerSecMax Maximum number of bytes per second to be transmitted.
377	*/
378	VMMR3DECL(int) PDMR3NsBwGroupSetLimit(PUVM pUVM, const char *pszBwGroup, uint64_t cbPerSecMax)
379	{
380	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
381	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
382	LOCK_NETSHAPER_RETURN(pShaper);
383
384	int rc;
385	PPDMNSBWGROUP pBwGroup = pdmNsBwGroupFindById(pShaper, pszBwGroup);
386	if (pBwGroup)
387	{
388	rc = PDMCritSectEnter(&pBwGroup->Lock, VERR_SEM_BUSY); AssertRC(rc);
389	if (RT_SUCCESS(rc))
390	{
391	pdmNsBwGroupSetLimit(pBwGroup, cbPerSecMax);
392
393	/* Drop extra tokens */
394	if (pBwGroup->cbTokensLast > pBwGroup->cbBucket)
395	pBwGroup->cbTokensLast = pBwGroup->cbBucket;
396
397	int rc2 = PDMCritSectLeave(&pBwGroup->Lock); AssertRC(rc2);
398	}
399	}
400	else
401	rc = VERR_NOT_FOUND;
402
403	UNLOCK_NETSHAPER(pShaper);
404	return rc;
405	}
406
407
408	/**
409	* I/O thread for pending TX.
410	*
411	* @returns VINF_SUCCESS (ignored).
412	* @param pVM The cross context VM structure.
413	* @param pThread The PDM thread data.
414	*/
415	static DECLCALLBACK(int) pdmR3NsTxThread(PVM pVM, PPDMTHREAD pThread)
416	{
417	RT_NOREF_PV(pVM);
418
419	PPDMNETSHAPER pShaper = (PPDMNETSHAPER)pThread->pvUser;
420	LogFlow(("pdmR3NsTxThread: pShaper=%p\n", pShaper));
421	while (pThread->enmState == PDMTHREADSTATE_RUNNING)
422	{
423	RTThreadSleep(PDM_NETSHAPER_MAX_LATENCY);
424
425	/* Go over all bandwidth groups/filters calling pfnXmitPending */
426	LOCK_NETSHAPER(pShaper);
427	PPDMNSBWGROUP pBwGroup = pShaper->pBwGroupsHead;
428	while (pBwGroup)
429	{
430	pdmNsBwGroupXmitPending(pBwGroup);
431	pBwGroup = pBwGroup->pNextR3;
432	}
433	UNLOCK_NETSHAPER(pShaper);
434	}
435	return VINF_SUCCESS;
436	}
437
438
439	/**
440	* @copydoc FNPDMTHREADWAKEUPINT
441	*/
442	static DECLCALLBACK(int) pdmR3NsTxWakeUp(PVM pVM, PPDMTHREAD pThread)
443	{
444	RT_NOREF2(pVM, pThread);
445	LogFlow(("pdmR3NsTxWakeUp: pShaper=%p\n", pThread->pvUser));
446	/* Nothing to do */
447	return VINF_SUCCESS;
448	}
449
450
451	/**
452	* Terminate the network shaper.
453	*
454	* @returns VBox error code.
455	* @param pVM The cross context VM structure.
456	*
457	* @remarks This method destroys all bandwidth group objects.
458	*/
459	int pdmR3NetShaperTerm(PVM pVM)
460	{
461	PUVM pUVM = pVM->pUVM;
462	AssertPtrReturn(pUVM, VERR_INVALID_POINTER);
463	PPDMNETSHAPER pShaper = pUVM->pdm.s.pNetShaper;
464	AssertPtrReturn(pShaper, VERR_INVALID_POINTER);
465
466	/* Destroy the bandwidth managers. */
467	PPDMNSBWGROUP pBwGroup = pShaper->pBwGroupsHead;
468	while (pBwGroup)
469	{
470	PPDMNSBWGROUP pFree = pBwGroup;
471	pBwGroup = pBwGroup->pNextR3;
472	pdmNsBwGroupTerminate(pFree);
473	MMR3HeapFree(pFree->pszNameR3);
474	MMHyperFree(pVM, pFree);
475	}
476
477	RTCritSectDelete(&pShaper->Lock);
478	MMR3HeapFree(pShaper);
479	pUVM->pdm.s.pNetShaper = NULL;
480	return VINF_SUCCESS;
481	}
482
483
484	/**
485	* Initialize the network shaper.
486	*
487	* @returns VBox status code
488	* @param pVM The cross context VM structure.
489	*/
490	int pdmR3NetShaperInit(PVM pVM)
491	{
492	LogFlow(("pdmR3NetShaperInit: pVM=%p\n", pVM));
493	VM_ASSERT_EMT(pVM);
494	PUVM pUVM = pVM->pUVM;
495	AssertMsgReturn(!pUVM->pdm.s.pNetShaper, ("Network shaper was already initialized\n"), VERR_WRONG_ORDER);
496
497	PPDMNETSHAPER pShaper;
498	int rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_NET_SHAPER, sizeof(PDMNETSHAPER), (void **)&pShaper);
499	if (RT_SUCCESS(rc))
500	{
501	PCFGMNODE pCfgNetShaper = CFGMR3GetChild(CFGMR3GetChild(CFGMR3GetRoot(pVM), "PDM"), "NetworkShaper");
502
503	pShaper->pVM = pVM;
504	rc = RTCritSectInit(&pShaper->Lock);
505	if (RT_SUCCESS(rc))
506	{
507	/* Create all bandwidth groups. */
508	PCFGMNODE pCfgBwGrp = CFGMR3GetChild(pCfgNetShaper, "BwGroups");
509	if (pCfgBwGrp)
510	{
511	for (PCFGMNODE pCur = CFGMR3GetFirstChild(pCfgBwGrp); pCur; pCur = CFGMR3GetNextChild(pCur))
512	{
513	size_t cbName = CFGMR3GetNameLen(pCur) + 1;
514	char pszBwGrpId = (char )RTMemAllocZ(cbName);
515	if (pszBwGrpId)
516	{
517	rc = CFGMR3GetName(pCur, pszBwGrpId, cbName);
518	if (RT_SUCCESS(rc))
519	{
520	uint64_t cbMax;
521	rc = CFGMR3QueryU64(pCur, "Max", &cbMax);
522	if (RT_SUCCESS(rc))
523	rc = pdmNsBwGroupCreate(pShaper, pszBwGrpId, cbMax);
524	}
525	RTMemFree(pszBwGrpId);
526	}
527	else
528	rc = VERR_NO_MEMORY;
529	if (RT_FAILURE(rc))
530	break;
531	}
532	}
533
534	if (RT_SUCCESS(rc))
535	{
536	rc = PDMR3ThreadCreate(pVM, &pShaper->pTxThread, pShaper, pdmR3NsTxThread, pdmR3NsTxWakeUp,
537	0 /cbStack/, RTTHREADTYPE_IO, "PDMNsTx");
538	if (RT_SUCCESS(rc))
539	{
540	pUVM->pdm.s.pNetShaper = pShaper;
541	return VINF_SUCCESS;
542	}
543	}
544
545	RTCritSectDelete(&pShaper->Lock);
546	}
547
548	MMR3HeapFree(pShaper);
549	}
550
551	LogFlow(("pdmR3NetShaperInit: pVM=%p rc=%Rrc\n", pVM, rc));
552	return rc;
553	}
554

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source: vbox/trunk/src/VBox/VMM/VMMR3/PDMNetShaper.cpp@ 70520

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