DrvTAPWin32.cpp@ 4071

Last change on this file since 4071 was 4071, checked in by vboxsync, 17 years ago
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1	/** @file
2	*
3	* VBox network devices:
4	* Linux/Win32 TUN network transport driver
5	*/
6
7	/*
8	* Copyright (C) 2006-2007 innotek GmbH
9	*
10	* This file is part of VirtualBox Open Source Edition (OSE), as
11	* available from http://www.virtualbox.org. This file is free software;
12	* you can redistribute it and/or modify it under the terms of the GNU
13	* General Public License as published by the Free Software Foundation,
14	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
15	* distribution. VirtualBox OSE is distributed in the hope that it will
16	* be useful, but WITHOUT ANY WARRANTY of any kind.
17	*/
18
19
20	#define ASYNC_NETIO
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_DRV_TUN
26	#include <VBox/pdmdrv.h>
27	#include <VBox/stam.h>
28
29	#include <VBox/log.h>
30	#include <iprt/assert.h>
31	#include <iprt/file.h>
32	#include <iprt/string.h>
33	#include <iprt/thread.h>
34	#ifdef ASYNC_NETIO
35	#include <iprt/asm.h>
36	#include <iprt/semaphore.h>
37	#endif
38
39	#include <windows.h>
40	#include <VBox/tapwin32.h>
41
42	#include "Builtins.h"
43
44	/*******************************************************************************
45	* Structures and Typedefs *
46	*******************************************************************************/
47	/**
48	* Block driver instance data.
49	*/
50	typedef struct
51	{
52	/** The network interface. */
53	PDMINETWORKCONNECTOR INetworkConnector;
54	/** The network interface. */
55	PPDMINETWORKPORT pPort;
56	/** Pointer to the driver instance. */
57	PPDMDRVINS pDrvIns;
58	/** TAP device file handle. */
59	HANDLE hFile;
60
61	HANDLE hEventWrite;
62	HANDLE hEventRead;
63
64	OVERLAPPED overlappedRead;
65	DWORD dwNumberOfBytesRead;
66	uint8_t readBuffer[4096];
67
68	TAP_VERSION tapVersion;
69
70	#ifdef ASYNC_NETIO
71	/** The thread handle. NIL_RTTHREAD if no thread. */
72	RTTHREAD hThread;
73	/** The event semaphore the thread is waiting on. */
74	HANDLE hHaltAsyncEventSem;
75	/** We are waiting for more receive buffers. */
76	uint32_t volatile fOutOfSpace;
77	/** Event semaphore for blocking on receive. */
78	RTSEMEVENT EventOutOfSpace;
79	#endif
80
81	#ifdef DEBUG
82	DWORD dwLastReadTime;
83	DWORD dwLastWriteTime;
84	#endif
85
86	#ifdef VBOX_WITH_STATISTICS
87	/** Number of sent packets. */
88	STAMCOUNTER StatPktSent;
89	/** Number of sent bytes. */
90	STAMCOUNTER StatPktSentBytes;
91	/** Number of received packets. */
92	STAMCOUNTER StatPktRecv;
93	/** Number of received bytes. */
94	STAMCOUNTER StatPktRecvBytes;
95	/** Profiling packet transmit runs. */
96	STAMPROFILEADV StatTransmit;
97	/** Profiling packet receive runs. */
98	STAMPROFILEADV StatReceive;
99	# ifdef ASYNC_NETIO
100	STAMPROFILE StatRecvOverflows;
101	# endif
102	#endif /* VBOX_WITH_STATISTICS */
103	} DRVTAP, *PDRVTAP;
104
105	/** Converts a pointer to TUN::INetworkConnector to a PRDVTUN. */
106	#define PDMINETWORKCONNECTOR_2_DRVTAP(pInterface) ( (PDRVTAP)((uintptr_t)pInterface - RT_OFFSETOF(DRVTAP, INetworkConnector)) )
107
108	/**
109	* Send data to the network.
110	*
111	* @returns VBox status code.
112	* @param pInterface Pointer to the interface structure containing the called function pointer.
113	* @param pvBuf Data to send.
114	* @param cb Number of bytes to send.
115	* @thread EMT
116	*/
117	static DECLCALLBACK(int) drvTAPW32Send(PPDMINETWORKCONNECTOR pInterface, const void *pvBuf, size_t cb)
118	{
119	OVERLAPPED overlapped;
120	DWORD cbBytesWritten;
121	int rc;
122	PDRVTAP pData = PDMINETWORKCONNECTOR_2_DRVTAP(pInterface);
123
124	Log2(("drvTAPW32Send%d: pvBuf=%p cb=%#x\n"
125	"%.*Vhxd\n", pData->pDrvIns->iInstance, pvBuf, cb, cb, pvBuf));
126
127	#ifdef DEBUG
128	pData->dwLastReadTime = timeGetTime();
129	Log(("drvTAPW32Send %d bytes at %08x - delta %x\n", cb, pData->dwLastReadTime, pData->dwLastReadTime - pData->dwLastWriteTime));
130	#endif
131
132	STAM_COUNTER_INC(&pData->StatPktSent);
133	STAM_COUNTER_ADD(&pData->StatPktSentBytes, cb);
134	STAM_PROFILE_ADV_START(&pData->StatTransmit, a);
135
136	memset(&overlapped, 0, sizeof(overlapped));
137	overlapped.hEvent = pData->hEventWrite;
138
139	rc = VINF_SUCCESS;
140	if (WriteFile(pData->hFile, pvBuf, cb, &cbBytesWritten, &overlapped) == FALSE)
141	{
142	if (GetLastError() == ERROR_IO_PENDING)
143	{
144	Log(("drvTAPW32Send: IO pending!!\n"));
145	rc = WaitForSingleObject(overlapped.hEvent, INFINITE);
146	AssertMsg(rc == WAIT_OBJECT_0, ("WaitForSingleObject failed with %x\n", rc));
147	rc = VINF_SUCCESS;
148	}
149	else
150	{
151	AssertMsgFailed(("WriteFile failed with %d\n", GetLastError()));
152	rc = RTErrConvertFromWin32(GetLastError());
153	}
154	}
155	STAM_PROFILE_ADV_STOP(&pData->StatTransmit, a);
156	AssertRC(rc);
157	return rc;
158	}
159
160
161	/**
162	* Set promiscuous mode.
163	*
164	* This is called when the promiscuous mode is set. This means that there doesn't have
165	* to be a mode change when it's called.
166	*
167	* @param pInterface Pointer to the interface structure containing the called function pointer.
168	* @param fPromiscuous Set if the adaptor is now in promiscuous mode. Clear if it is not.
169	* @thread EMT
170	*/
171	static DECLCALLBACK(void) drvTAPW32SetPromiscuousMode(PPDMINETWORKCONNECTOR pInterface, bool fPromiscuous)
172	{
173	LogFlow(("drvTAPW32SetPromiscuousMode: fPromiscuous=%d\n", fPromiscuous));
174	/* nothing to do */
175	}
176
177
178	/**
179	* Notification on link status changes.
180	*
181	* @param pInterface Pointer to the interface structure containing the called function pointer.
182	* @param enmLinkState The new link state.
183	* @thread EMT
184	*/
185	static DECLCALLBACK(void) drvTAPW32NotifyLinkChanged(PPDMINETWORKCONNECTOR pInterface, PDMNETWORKLINKSTATE enmLinkState)
186	{
187	LogFlow(("drvNATW32NotifyLinkChanged: enmLinkState=%d\n", enmLinkState));
188	/** @todo take action on link down and up. Stop the polling and such like. */
189	}
190
191
192	/**
193	* More receive buffer has become available.
194	*
195	* This is called when the NIC frees up receive buffers.
196	*
197	* @param pInterface Pointer to the interface structure containing the called function pointer.
198	* @thread EMT
199	*/
200	static DECLCALLBACK(void) drvTAPW32NotifyCanReceive(PPDMINETWORKCONNECTOR pInterface)
201	{
202	PDRVTAP pData = PDMINETWORKCONNECTOR_2_DRVTAP(pInterface);
203
204	LogFlow(("drvTAPW32NotifyCanReceive:\n"));
205	if (ASMAtomicXchgU32(&pData->fOutOfSpace, false))
206	RTSemEventSignal(pData->EventOutOfSpace);
207	}
208
209
210	#ifndef ASYNC_NETIO
211	/**
212	* Poller callback.
213	*/
214	static DECLCALLBACK(void) drvTAPW32Poller(PPDMDRVINS pDrvIns)
215	{
216	DWORD rc = ERROR_SUCCESS;
217	PDRVTAP pData = PDMINS2DATA(pDrvIns, PDRVTAP);
218	STAM_PROFILE_ADV_START(&pData->StatReceive, a);
219
220	/* check how much the device/driver can receive now. */
221	size_t cbMax = pData->pPort->pfnCanReceive(pData->pPort);
222
223	while (cbMax)
224	{
225	if (cbMax > 0 && !pData->overlappedRead.hEvent)
226	{
227	BOOL bRet;
228
229	cbMax = RT_MIN(cbMax, sizeof(pData->readBuffer));
230	memset(&pData->overlappedRead, 0, sizeof(pData->overlappedRead));
231	pData->overlappedRead.hEvent = pData->hEventRead;
232	bRet = ReadFile(pData->hFile, pData->readBuffer, cbMax, &pData->dwNumberOfBytesRead, &pData->overlappedRead);
233	if (bRet == FALSE)
234	{
235	rc = GetLastError();
236	AssertMsg(rc == ERROR_SUCCESS \|\| rc == ERROR_IO_PENDING \|\| rc == ERROR_MORE_DATA, ("ReadFileEx failed with rc=%d\n", rc));
237	if (rc != ERROR_IO_PENDING && rc != ERROR_MORE_DATA)
238	break;
239	}
240	}
241	if (cbMax)
242	{
243	DWORD dwNumberOfBytesTransferred = 0;
244
245	if (GetOverlappedResult(pData->hFile, &pData->overlappedRead, &dwNumberOfBytesTransferred, FALSE) == TRUE)
246	{
247	/* push it to the driver. */
248	Log2(("drvTAPW32Poller%d: cbRead=%#x\n"
249	"%.*Vhxd\n", pData->InstanceNr,
250	dwNumberOfBytesTransferred, dwNumberOfBytesTransferred, pData->readBuffer));
251
252	STAM_COUNTER_INC(&pData->StatPktRecv);
253	STAM_COUNTER_ADD(&pData->StatPktRecvBytes, dwNumberOfBytesTransferred);
254
255	#ifdef DEBUG
256	pData->dwLastWriteTime = timeGetTime();
257	Log(("drvTAPW32Receive %d bytes at %08x - delta %x\n", dwNumberOfBytesTransferred,
258	pData->dwLastWriteTime, pData->dwLastWriteTime - pData->dwLastReadTime));
259	#endif
260
261	rc = pData->pPort->pfnReceive(pData->pPort, pData->readBuffer, dwNumberOfBytesTransferred);
262	AssertRC(rc);
263
264	memset(&pData->overlappedRead, 0, sizeof(pData->overlappedRead));
265	}
266	else
267	{
268	rc = GetLastError();
269	Assert(rc == ERROR_IO_INCOMPLETE);
270
271	/* reset overlapped structure on aborted read operation */
272	if (rc != ERROR_IO_INCOMPLETE)
273	{
274	memset(&pData->overlappedRead, 0, sizeof(pData->overlappedRead));
275	}
276	break;
277	}
278	}
279	cbMax = pData->pPort->pfnCanReceive(pData->pPort);
280	}
281	STAM_PROFILE_ADV_STOP(&pData->StatReceive, a);
282	}
283	#else /* !ASYNC_NETIO */
284	/**
285	* Async I/O thread for an interface.
286	*/
287	static DECLCALLBACK(int) drvTAPW32AsyncIo(RTTHREAD ThreadSelf, void *pvUser)
288	{
289	PDRVTAP pData = (PDRVTAP)pvUser;
290	HANDLE haWait[2];
291	DWORD rc = ERROR_SUCCESS, dwNumberOfBytesTransferred;
292
293	Assert(pData);
294	haWait[0] = pData->hEventRead;
295	haWait[1] = pData->hHaltAsyncEventSem;
296
297	rc = RTSemEventCreate(&pData->EventOutOfSpace);
298	AssertRC(rc);
299
300	while(1)
301	{
302	BOOL bRet;
303
304	memset(&pData->overlappedRead, 0, sizeof(pData->overlappedRead));
305	pData->overlappedRead.hEvent = pData->hEventRead;
306	bRet = ReadFile(pData->hFile, pData->readBuffer, sizeof(pData->readBuffer),
307	&dwNumberOfBytesTransferred, &pData->overlappedRead);
308	if (bRet == FALSE)
309	{
310	rc = GetLastError();
311	AssertMsg(rc == ERROR_IO_PENDING \|\| rc == ERROR_MORE_DATA, ("ReadFile failed with rc=%d\n", rc));
312	if (rc != ERROR_IO_PENDING && rc != ERROR_MORE_DATA)
313	break;
314
315	rc = WaitForMultipleObjects(2, &haWait[0], FALSE, INFINITE);
316	AssertMsg(rc == WAIT_OBJECT_0 \|\| rc == WAIT_OBJECT_0+1, ("WaitForSingleObject failed with %x\n", rc));
317
318	if (rc != WAIT_OBJECT_0)
319	break; /* asked to quit or fatal error. */
320
321	rc = GetOverlappedResult(pData->hFile, &pData->overlappedRead, &dwNumberOfBytesTransferred, FALSE);
322	Assert(rc == TRUE);
323
324	/* If GetOverlappedResult() returned with TRUE, the operation was finished successfully */
325	}
326
327	/* Not very nice, but what else can we do? */
328	size_t cbMax = pData->pPort->pfnCanReceive(pData->pPort);
329	if (cbMax < dwNumberOfBytesTransferred)
330	{
331	STAM_PROFILE_START(&pData->StatRecvOverflows, b);
332	while (cbMax < dwNumberOfBytesTransferred)
333	{
334	#if 1
335	ASMAtomicXchgU32(&pData->fOutOfSpace, true);
336	RTSemEventWait(pData->EventOutOfSpace, 50);
337	#else
338	RTThreadSleep(16); /* @todo right value? */
339	#endif
340	/* Check if the VM was terminated */
341	rc = WaitForSingleObject(haWait[1], 0);
342	if (rc == WAIT_OBJECT_0)
343	{
344	STAM_PROFILE_STOP(&pData->StatRecvOverflows, b);
345	goto exit_thread;
346	}
347
348	cbMax = pData->pPort->pfnCanReceive(pData->pPort);
349	}
350	ASMAtomicXchgU32(&pData->fOutOfSpace, false);
351	STAM_PROFILE_STOP(&pData->StatRecvOverflows, b);
352	Assert(cbMax >= dwNumberOfBytesTransferred);
353	}
354
355	STAM_COUNTER_INC(&pData->StatPktRecv);
356	STAM_COUNTER_ADD(&pData->StatPktRecvBytes, dwNumberOfBytesTransferred);
357	#ifdef DEBUG
358	pData->dwLastWriteTime = timeGetTime();
359	Log(("drvTAPW32AsyncIo %d bytes at %08x - delta %x\n", dwNumberOfBytesTransferred,
360	pData->dwLastWriteTime, pData->dwLastWriteTime - pData->dwLastReadTime));
361	#endif
362	rc = pData->pPort->pfnReceive(pData->pPort, pData->readBuffer, dwNumberOfBytesTransferred);
363	AssertRC(rc);
364	}
365
366	exit_thread:
367	SetEvent(pData->hHaltAsyncEventSem);
368	Log(("drvTAPW32AsyncIo: exit thread!!\n"));
369	return VINF_SUCCESS;
370	}
371	#endif /* !ASYNC_NETIO */
372
373	/**
374	* Queries an interface to the driver.
375	*
376	* @returns Pointer to interface.
377	* @returns NULL if the interface was not supported by the driver.
378	* @param pInterface Pointer to this interface structure.
379	* @param enmInterface The requested interface identification.
380	* @thread Any thread.
381	*/
382	static DECLCALLBACK(void *) drvTAPW32QueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface)
383	{
384	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
385	PDRVTAP pData = PDMINS2DATA(pDrvIns, PDRVTAP);
386	switch (enmInterface)
387	{
388	case PDMINTERFACE_BASE:
389	return &pDrvIns->IBase;
390	case PDMINTERFACE_NETWORK_CONNECTOR:
391	return &pData->INetworkConnector;
392	default:
393	return NULL;
394	}
395	}
396
397
398	/**
399	* Destruct a driver instance.
400	*
401	* Most VM resources are freed by the VM. This callback is provided so that any non-VM
402	* resources can be freed correctly.
403	*
404	* @param pDrvIns The driver instance data.
405	*/
406	static DECLCALLBACK(void) drvTAPW32Destruct(PPDMDRVINS pDrvIns)
407	{
408	PDRVTAP pData = PDMINS2DATA(pDrvIns, PDRVTAP);
409	TAP_MEDIASTATUS mediastatus;
410	DWORD dwLength;
411
412	LogFlow(("drvTAPW32Destruct\n"));
413
414	#ifdef ASYNC_NETIO
415	/** @todo this isn't a safe method to notify the async thread; it might be using the instance
416	* data after we've been destroyed; could wait for it to terminate, but that's not
417	* without risks either.
418	*/
419	SetEvent(pData->hHaltAsyncEventSem);
420
421	/* Ensure that it does not spin in the CanReceive loop. Do it _after_ we set set the
422	* hHaltAsyncEventSem to ensure that we don't go into the loop again immediately. */
423	if (ASMAtomicXchgU32(&pData->fOutOfSpace, false))
424	RTSemEventSignal(pData->EventOutOfSpace);
425
426	/* Yield or else our async thread will never acquire the event semaphore */
427	RTThreadSleep(16);
428	/* Wait for the async thread to quit; up to half a second */
429	WaitForSingleObject(pData->hHaltAsyncEventSem, 500);
430	#endif
431
432	mediastatus.fConnect = FALSE;
433	BOOL ret = DeviceIoControl(pData->hFile, TAP_IOCTL_SET_MEDIA_STATUS,
434	&mediastatus, sizeof(mediastatus), NULL, 0, &dwLength, NULL);
435	Assert(ret);
436
437	CloseHandle(pData->hEventWrite);
438	CancelIo(pData->hFile);
439	CloseHandle(pData->hFile);
440	}
441
442
443	/**
444	* Construct a TUN network transport driver instance.
445	*
446	* @returns VBox status.
447	* @param pDrvIns The driver instance data.
448	* If the registration structure is needed, pDrvIns->pDrvReg points to it.
449	* @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration
450	* of the driver instance. It's also found in pDrvIns->pCfgHandle, but like
451	* iInstance it's expected to be used a bit in this function.
452	*/
453	static DECLCALLBACK(int) drvTAPW32Construct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle)
454	{
455	PDRVTAP pData = PDMINS2DATA(pDrvIns, PDRVTAP);
456
457	/*
458	* Init the static parts.
459	*/
460	pData->pDrvIns = pDrvIns;
461	pData->hFile = INVALID_HANDLE_VALUE;
462	/* IBase */
463	pDrvIns->IBase.pfnQueryInterface = drvTAPW32QueryInterface;
464	/* INetwork */
465	pData->INetworkConnector.pfnSend = drvTAPW32Send;
466	pData->INetworkConnector.pfnSetPromiscuousMode = drvTAPW32SetPromiscuousMode;
467	pData->INetworkConnector.pfnNotifyLinkChanged = drvTAPW32NotifyLinkChanged;
468	pData->INetworkConnector.pfnNotifyCanReceive = drvTAPW32NotifyCanReceive;
469
470	/*
471	* Validate the config.
472	*/
473	if (!CFGMR3AreValuesValid(pCfgHandle, "Device\0HostInterfaceName\0GUID\0"))
474	return VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES;
475
476	/*
477	* Check that no-one is attached to us.
478	*/
479	int rc = pDrvIns->pDrvHlp->pfnAttach(pDrvIns, NULL);
480	if (rc != VERR_PDM_NO_ATTACHED_DRIVER)
481	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DRVINS_NO_ATTACH,
482	N_("Configuration error: Cannot attach drivers to the TUN driver!"));
483
484	/*
485	* Query the network port interface.
486	*/
487	pData->pPort = (PPDMINETWORKPORT)pDrvIns->pUpBase->pfnQueryInterface(pDrvIns->pUpBase, PDMINTERFACE_NETWORK_PORT);
488	if (!pData->pPort)
489	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_ABOVE,
490	N_("Configuration error: the above device/driver didn't export the network port interface!"));
491
492	/*
493	* Read the configuration.
494	*/
495	char *pszHostDriver = NULL;
496	rc = CFGMR3QueryStringAlloc(pCfgHandle, "HostInterfaceName", &pszHostDriver);
497	if (VBOX_FAILURE(rc))
498	return PDMDRV_SET_ERROR(pDrvIns, rc,
499	N_("Configuration error: query for \"HostInterfaceName\" failed."));
500
501	TAP_MEDIASTATUS mediastatus;
502	DWORD length;
503	char szFullDriverName[256];
504	char szDriverGUID[256] = {0};
505
506	rc = CFGMR3QueryBytes(pCfgHandle, "GUID", szDriverGUID, sizeof(szDriverGUID));
507	if (VBOX_FAILURE(rc))
508	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_DEVINS_UNKNOWN_CFG_VALUES,
509	N_("Configuration error: could not query GUID!"));
510
511	RTStrPrintfEx(NULL, NULL, szFullDriverName, sizeof(szFullDriverName), "\\\\.\\Global\\%s.tap", szDriverGUID);
512
513	pData->hFile = CreateFile(szFullDriverName, GENERIC_READ \| GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
514	FILE_ATTRIBUTE_SYSTEM \| FILE_FLAG_OVERLAPPED, 0);
515
516	if (pData->hFile == INVALID_HANDLE_VALUE)
517	{
518	rc = GetLastError();
519
520	AssertMsgFailed(("Configuration error: TAP device name %s is not valid! (rc=%d)\n", szFullDriverName, rc));
521	if (rc == ERROR_SHARING_VIOLATION)
522	return VERR_PDM_HIF_SHARING_VIOLATION;
523
524	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_HIF_OPEN_FAILED,
525	N_("Failed to open Host Interface Networking device driver"));
526	}
527
528	BOOL ret = DeviceIoControl(pData->hFile, TAP_IOCTL_GET_VERSION, &pData->tapVersion, sizeof (pData->tapVersion),
529	&pData->tapVersion, sizeof(pData->tapVersion), &length, NULL);
530	if (ret == FALSE)
531	{
532	CloseHandle(pData->hFile);
533	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_HIF_INVALID_VERSION,
534	N_("Failed to get the Host Interface Networking device driver version."));;
535	}
536	LogRel(("TAP version %d.%d\n", pData->tapVersion.major, pData->tapVersion.minor));
537
538	/* Must be at least version 8.1 */
539	if ( pData->tapVersion.major != 8
540	\|\| pData->tapVersion.minor < 1)
541	{
542	CloseHandle(pData->hFile);
543	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_HIF_INVALID_VERSION,
544	N_("Invalid Host Interface Networking device driver version."));;
545	}
546
547	mediastatus.fConnect = TRUE;
548	ret = DeviceIoControl(pData->hFile, TAP_IOCTL_SET_MEDIA_STATUS, &mediastatus, sizeof(mediastatus), NULL, 0, &length, NULL);
549	if (ret == FALSE)
550	{
551	CloseHandle(pData->hFile);
552	return VERR_PDM_DEVINS_UNKNOWN_CFG_VALUES;
553	}
554
555	if (pszHostDriver)
556	MMR3HeapFree(pszHostDriver);
557
558	pData->hEventWrite = CreateEvent(NULL, FALSE, FALSE, NULL);
559	pData->hEventRead = CreateEvent(NULL, FALSE, FALSE, NULL);
560	memset(&pData->overlappedRead, 0, sizeof(pData->overlappedRead));
561
562	#ifdef ASYNC_NETIO
563	pData->hHaltAsyncEventSem = CreateEvent(NULL, FALSE, FALSE, NULL);
564
565	/* Create asynchronous thread */
566	rc = RTThreadCreate(&pData->hThread, drvTAPW32AsyncIo, (void )pData, 1281024, RTTHREADTYPE_IO, 0, "TAPWIN32");
567	AssertRC(rc);
568
569	Assert(pData->hThread != NIL_RTTHREAD && pData->hHaltAsyncEventSem != NULL);
570	#else
571	/*
572	* Register poller
573	*/
574	rc = pDrvIns->pDrvHlp->pfnPDMPollerRegister(pDrvIns, drvTAPW32Poller);
575	AssertRC(rc);
576	#endif
577
578	#ifdef VBOX_WITH_STATISTICS
579	/*
580	* Statistics.
581	*/
582	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPktSent, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, "Number of sent packets.", "/Drivers/TAP%d/Packets/Sent", pDrvIns->iInstance);
583	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPktSentBytes, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, "Number of sent bytes.", "/Drivers/TAP%d/Bytes/Sent", pDrvIns->iInstance);
584	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPktRecv, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_OCCURENCES, "Number of received packets.", "/Drivers/TAP%d/Packets/Received", pDrvIns->iInstance);
585	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPktRecvBytes, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, "Number of received bytes.", "/Drivers/TAP%d/Bytes/Received", pDrvIns->iInstance);
586	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTransmit, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS, STAMUNIT_TICKS_PER_CALL, "Profiling packet transmit runs.", "/Drivers/TAP%d/Transmit", pDrvIns->iInstance);
587	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatReceive, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS, STAMUNIT_TICKS_PER_CALL, "Profiling packet receive runs.", "/Drivers/TAP%d/Receive", pDrvIns->iInstance);
588	# ifdef ASYNC_NETIO
589	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatRecvOverflows,STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS, STAMUNIT_TICKS_PER_OCCURENCE, "Profiling packet receive overflows.", "/Drivers/TAP%d/RecvOverflows", pDrvIns->iInstance);
590	# endif
591	#endif
592
593	return rc;
594	}
595
596
597	/**
598	* Host Interface network transport driver registration record.
599	*/
600	const PDMDRVREG g_DrvHostInterface =
601	{
602	/* u32Version */
603	PDM_DRVREG_VERSION,
604	/* szDriverName */
605	"HostInterface",
606	/* pszDescription */
607	"Host Interface Network Transport Driver",
608	/* fFlags */
609	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
610	/* fClass. */
611	PDM_DRVREG_CLASS_NETWORK,
612	/* cMaxInstances */
613	~0,
614	/* cbInstance */
615	sizeof(DRVTAP),
616	/* pfnConstruct */
617	drvTAPW32Construct,
618	/* pfnDestruct */
619	drvTAPW32Destruct,
620	/* pfnIOCtl */
621	NULL,
622	/* pfnPowerOn */
623	NULL,
624	/* pfnReset */
625	NULL,
626	/* pfnSuspend */
627	NULL,
628	/* pfnResume */
629	NULL,
630	/* pfnDetach */
631	NULL,
632	/* pfnPowerOff */
633	NULL
634	};

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source: vbox/trunk/src/VBox/Devices/Network/DrvTAPWin32.cpp@ 4071

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