intnetinline.h@ 38643

Last change on this file since 38643 was 38549, checked in by vboxsync, 13 years ago
GSO: UDP fragmentation offloading (#5846)
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1	/* $Id: intnetinline.h 38549 2011-08-26 13:26:07Z vboxsync $ */
2	/** @file
3	* INTNET - Internal Networking, Inlined Code. (DEV,++)
4	*
5	* This is all inlined because it's too tedious to create 2-3 libraries to
6	* contain it all. Large parts of this header is only accessible from C++
7	* sources because of mixed code and variables.
8	*/
9
10	/*
11	* Copyright (C) 2006-2010 Oracle Corporation
12	*
13	* This file is part of VirtualBox Open Source Edition (OSE), as
14	* available from http://www.virtualbox.org. This file is free software;
15	* you can redistribute it and/or modify it under the terms of the GNU
16	* General Public License (GPL) as published by the Free Software
17	* Foundation, in version 2 as it comes in the "COPYING" file of the
18	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
19	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
20	*
21	* The contents of this file may alternatively be used under the terms
22	* of the Common Development and Distribution License Version 1.0
23	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
24	* VirtualBox OSE distribution, in which case the provisions of the
25	* CDDL are applicable instead of those of the GPL.
26	*
27	* You may elect to license modified versions of this file under the
28	* terms and conditions of either the GPL or the CDDL or both.
29	*/
30
31	#ifndef ___VBox_intnetinline_h
32	#define ___VBox_intnetinline_h
33
34	#include <VBox/intnet.h>
35	#include <iprt/string.h>
36	#include <iprt/assert.h>
37	#include <iprt/err.h>
38	#include <VBox/log.h>
39
40
41
42	/**
43	* Valid internal networking frame type.
44	*
45	* @returns true / false.
46	* @param u16Type The frame type to check.
47	*/
48	DECLINLINE(bool) IntNetIsValidFrameType(uint16_t u16Type)
49	{
50	if (RT_LIKELY( u16Type == INTNETHDR_TYPE_FRAME
51	\|\| u16Type == INTNETHDR_TYPE_GSO
52	\|\| u16Type == INTNETHDR_TYPE_PADDING))
53	return true;
54	return false;
55	}
56
57
58	/**
59	* Partly initializes a scatter / gather buffer, leaving the segments to the
60	* caller.
61	*
62	* @returns Pointer to the start of the frame.
63	* @param pSG Pointer to the scatter / gather structure.
64	* @param cbTotal The total size.
65	* @param cSegs The number of segments.
66	* @param cSegsUsed The number of used segments.
67	*/
68	DECLINLINE(void) IntNetSgInitTempSegs(PINTNETSG pSG, uint32_t cbTotal, unsigned cSegs, unsigned cSegsUsed)
69	{
70	pSG->pvOwnerData = NULL;
71	pSG->pvUserData = NULL;
72	pSG->pvUserData2 = NULL;
73	pSG->cbTotal = cbTotal;
74	pSG->cUsers = 1;
75	pSG->fFlags = INTNETSG_FLAGS_TEMP;
76	pSG->GsoCtx.u8Type = (uint8_t)PDMNETWORKGSOTYPE_INVALID;
77	pSG->GsoCtx.cbHdrsTotal = 0;
78	pSG->GsoCtx.cbHdrsSeg = 0;
79	pSG->GsoCtx.cbMaxSeg= 0;
80	pSG->GsoCtx.offHdr1 = 0;
81	pSG->GsoCtx.offHdr2 = 0;
82	pSG->GsoCtx.u8Unused= 0;
83	#if ARCH_BITS == 64
84	pSG->uPadding = 0;
85	#endif
86	pSG->cSegsAlloc = (uint16_t)cSegs;
87	Assert(pSG->cSegsAlloc == cSegs);
88	pSG->cSegsUsed = (uint16_t)cSegsUsed;
89	Assert(pSG->cSegsUsed == cSegsUsed);
90	Assert(cSegs >= cSegsUsed);
91	}
92
93
94	/**
95	* Partly initializes a scatter / gather buffer w/ GSO, leaving the segments to
96	* the caller.
97	*
98	* @returns Pointer to the start of the frame.
99	* @param pSG Pointer to the scatter / gather structure.
100	* @param cbTotal The total size.
101	* @param cSegs The number of segments.
102	* @param cSegsUsed The number of used segments.
103	* @param pGso The GSO context.
104	*/
105	DECLINLINE(void) IntNetSgInitTempSegsGso(PINTNETSG pSG, uint32_t cbTotal, unsigned cSegs,
106	unsigned cSegsUsed, PCPDMNETWORKGSO pGso)
107	{
108	pSG->pvOwnerData = NULL;
109	pSG->pvUserData = NULL;
110	pSG->pvUserData2 = NULL;
111	pSG->cbTotal = cbTotal;
112	pSG->cUsers = 1;
113	pSG->fFlags = INTNETSG_FLAGS_TEMP;
114	pSG->GsoCtx.u8Type = pGso->u8Type;
115	pSG->GsoCtx.cbHdrsTotal = pGso->cbHdrsTotal;
116	pSG->GsoCtx.cbHdrsSeg = pGso->cbHdrsSeg;
117	pSG->GsoCtx.cbMaxSeg= pGso->cbMaxSeg;
118	pSG->GsoCtx.offHdr1 = pGso->offHdr1;
119	pSG->GsoCtx.offHdr2 = pGso->offHdr2;
120	pSG->GsoCtx.u8Unused= 0;
121	#if ARCH_BITS == 64
122	pSG->uPadding = 0;
123	#endif
124	pSG->cSegsAlloc = (uint16_t)cSegs;
125	Assert(pSG->cSegsAlloc == cSegs);
126	pSG->cSegsUsed = (uint16_t)cSegsUsed;
127	Assert(pSG->cSegsUsed == cSegsUsed);
128	Assert(cSegs >= cSegsUsed);
129	}
130
131
132
133	/**
134	* Initializes a scatter / gather buffer describing a simple linear buffer.
135	*
136	* @returns Pointer to the start of the frame.
137	* @param pSG Pointer to the scatter / gather structure.
138	* @param pvFrame Pointer to the frame
139	* @param cbFrame The size of the frame.
140	*/
141	DECLINLINE(void) IntNetSgInitTemp(PINTNETSG pSG, void *pvFrame, uint32_t cbFrame)
142	{
143	IntNetSgInitTempSegs(pSG, cbFrame, 1, 1);
144	pSG->aSegs[0].Phys = NIL_RTHCPHYS;
145	pSG->aSegs[0].pv = pvFrame;
146	pSG->aSegs[0].cb = cbFrame;
147	}
148
149	/**
150	* Initializes a scatter / gather buffer describing a simple linear buffer.
151	*
152	* @returns Pointer to the start of the frame.
153	* @param pSG Pointer to the scatter / gather structure.
154	* @param pvFrame Pointer to the frame
155	* @param cbFrame The size of the frame.
156	* @param pGso The GSO context.
157	*/
158	DECLINLINE(void) IntNetSgInitTempGso(PINTNETSG pSG, void *pvFrame, uint32_t cbFrame, PCPDMNETWORKGSO pGso)
159	{
160	IntNetSgInitTempSegsGso(pSG, cbFrame, 1, 1, pGso);
161	pSG->aSegs[0].Phys = NIL_RTHCPHYS;
162	pSG->aSegs[0].pv = pvFrame;
163	pSG->aSegs[0].cb = cbFrame;
164	}
165
166
167	/**
168	* Reads an entire SG into a fittingly size buffer.
169	*
170	* @param pSG The SG list to read.
171	* @param pvBuf The buffer to read into (at least pSG->cbTotal in size).
172	*/
173	DECLINLINE(void) IntNetSgRead(PCINTNETSG pSG, void *pvBuf)
174	{
175	memcpy(pvBuf, pSG->aSegs[0].pv, pSG->aSegs[0].cb);
176	if (pSG->cSegsUsed == 1)
177	Assert(pSG->cbTotal == pSG->aSegs[0].cb);
178	else
179	{
180	uint8_t pbDst = (uint8_t )pvBuf + pSG->aSegs[0].cb;
181	unsigned iSeg = 0;
182	unsigned const cSegs = pSG->cSegsUsed;
183	while (++iSeg < cSegs)
184	{
185	uint32_t cbSeg = pSG->aSegs[iSeg].cb;
186	Assert((uintptr_t)pbDst - (uintptr_t)pvBuf + cbSeg <= pSG->cbTotal);
187	memcpy(pbDst, pSG->aSegs[iSeg].pv, cbSeg);
188	pbDst += cbSeg;
189	}
190	}
191	}
192
193
194	/**
195	* Reads a portion of an SG into a buffer.
196	*
197	* @param pSG The SG list to read.
198	* @param offSrc The offset to start start copying from.
199	* @param cbToRead The number of bytes to copy.
200	* @param pvBuf The buffer to read into, cb or more in size.
201	*/
202	DECLINLINE(void) IntNetSgReadEx(PCINTNETSG pSG, uint32_t offSrc, uint32_t cbToRead, void *pvBuf)
203	{
204	uint8_t pbDst = (uint8_t )pvBuf;
205	uint32_t iSeg = 0;
206
207	/* validate assumptions */
208	Assert(cbToRead <= pSG->cbTotal);
209	Assert(offSrc <= pSG->cbTotal);
210	Assert(offSrc + cbToRead <= pSG->cbTotal);
211
212	/* Find the right segment and copy any bits from within the segment. */
213	while (offSrc)
214	{
215	uint32_t cbSeg = pSG->aSegs[iSeg].cb;
216	if (offSrc < cbSeg)
217	{
218	uint32_t cbChunk = cbSeg - offSrc;
219	if (cbChunk >= cbToRead)
220	{
221	memcpy(pbDst, (uint8_t const *)pSG->aSegs[iSeg].pv + offSrc, cbToRead);
222	return;
223	}
224
225	memcpy(pbDst, (uint8_t const *)pSG->aSegs[iSeg].pv + offSrc, cbChunk);
226	pbDst += cbChunk;
227	cbToRead -= cbChunk;
228	break;
229	}
230
231	/* advance */
232	offSrc -= cbSeg;
233	iSeg++;
234	}
235
236	/* We're not at the start of a segment, copy until we're done. */
237	for (;;)
238	{
239	uint32_t cbSeg = pSG->aSegs[iSeg].cb;
240	if (cbSeg >= cbToRead)
241	{
242	memcpy(pbDst, pSG->aSegs[iSeg].pv, cbToRead);
243	return;
244	}
245
246	memcpy(pbDst, pSG->aSegs[iSeg].pv, cbSeg);
247	pbDst += cbSeg;
248	cbToRead -= cbSeg;
249	iSeg++;
250	Assert(iSeg < pSG->cSegsUsed);
251	}
252	}
253
254	#ifdef __cplusplus
255
256	/**
257	* Get the amount of space available for writing.
258	*
259	* @returns Number of available bytes.
260	* @param pRingBuf The ring buffer.
261	*/
262	DECLINLINE(uint32_t) IntNetRingGetWritable(PINTNETRINGBUF pRingBuf)
263	{
264	uint32_t const offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
265	uint32_t const offWriteInt = ASMAtomicUoReadU32(&pRingBuf->offWriteInt);
266	return offRead <= offWriteInt
267	? pRingBuf->offEnd - offWriteInt + offRead - pRingBuf->offStart - 1
268	: offRead - offWriteInt - 1;
269	}
270
271
272	/**
273	* Checks if the ring has more for us to read.
274	*
275	* @returns Number of ready bytes.
276	* @param pRingBuf The ring buffer.
277	*/
278	DECLINLINE(bool) IntNetRingHasMoreToRead(PINTNETRINGBUF pRingBuf)
279	{
280	uint32_t const offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
281	uint32_t const offWriteCom = ASMAtomicUoReadU32(&pRingBuf->offWriteCom);
282	return offRead != offWriteCom;
283	}
284
285
286	/**
287	* Gets the next frame to read.
288	*
289	* @returns Pointer to the next frame. NULL if done.
290	* @param pRingBuf The ring buffer.
291	*/
292	DECLINLINE(PINTNETHDR) IntNetRingGetNextFrameToRead(PINTNETRINGBUF pRingBuf)
293	{
294	uint32_t const offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
295	uint32_t const offWriteCom = ASMAtomicUoReadU32(&pRingBuf->offWriteCom);
296	if (offRead == offWriteCom)
297	return NULL;
298	return (PINTNETHDR)((uint8_t *)pRingBuf + offRead);
299	}
300
301
302	/**
303	* Get the amount of data ready for reading.
304	*
305	* @returns Number of ready bytes.
306	* @param pRingBuf The ring buffer.
307	*/
308	DECLINLINE(uint32_t) IntNetRingGetReadable(PINTNETRINGBUF pRingBuf)
309	{
310	uint32_t const offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
311	uint32_t const offWriteCom = ASMAtomicUoReadU32(&pRingBuf->offWriteCom);
312	return offRead <= offWriteCom
313	? offWriteCom - offRead
314	: pRingBuf->offEnd - offRead + offWriteCom - pRingBuf->offStart;
315	}
316
317
318	/**
319	* Calculates the pointer to the frame.
320	*
321	* @returns Pointer to the start of the frame.
322	* @param pHdr Pointer to the packet header
323	* @param pBuf The buffer the header is within. Only used in strict builds.
324	*/
325	DECLINLINE(void *) IntNetHdrGetFramePtr(PCINTNETHDR pHdr, PCINTNETBUF pBuf)
326	{
327	uint8_t pu8 = (uint8_t )pHdr + pHdr->offFrame;
328	#ifdef VBOX_STRICT
329	const uintptr_t off = (uintptr_t)pu8 - (uintptr_t)pBuf;
330	Assert(IntNetIsValidFrameType(pHdr->u16Type));
331	Assert(off < pBuf->cbBuf);
332	Assert(off + pHdr->cbFrame <= pBuf->cbBuf);
333	#endif
334	NOREF(pBuf);
335	return pu8;
336	}
337
338
339	/**
340	* Calculates the pointer to the GSO context.
341	*
342	* ASSUMES the frame is a GSO frame.
343	*
344	* The GSO context is immediately followed by the headers and payload. The size
345	* is INTNETBUF::cbFrame - sizeof(PDMNETWORKGSO).
346	*
347	* @returns Pointer to the GSO context.
348	* @param pHdr Pointer to the packet header
349	* @param pBuf The buffer the header is within. Only used in strict builds.
350	*/
351	DECLINLINE(PPDMNETWORKGSO) IntNetHdrGetGsoContext(PCINTNETHDR pHdr, PCINTNETBUF pBuf)
352	{
353	PPDMNETWORKGSO pGso = (PPDMNETWORKGSO)((uint8_t *)pHdr + pHdr->offFrame);
354	#ifdef VBOX_STRICT
355	const uintptr_t off = (uintptr_t)pGso - (uintptr_t)pBuf;
356	Assert(pHdr->u16Type == INTNETHDR_TYPE_GSO);
357	Assert(off < pBuf->cbBuf);
358	Assert(off + pHdr->cbFrame <= pBuf->cbBuf);
359	#endif
360	NOREF(pBuf);
361	return pGso;
362	}
363
364
365	/**
366	* Skips to the next (read) frame in the buffer.
367	*
368	* @param pRingBuf The ring buffer in question.
369	*/
370	DECLINLINE(void) IntNetRingSkipFrame(PINTNETRINGBUF pRingBuf)
371	{
372	uint32_t const offReadOld = ASMAtomicUoReadU32(&pRingBuf->offReadX);
373	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offReadOld);
374	Assert(offReadOld >= pRingBuf->offStart);
375	Assert(offReadOld < pRingBuf->offEnd);
376	Assert(RT_ALIGN_PT(pHdr, INTNETHDR_ALIGNMENT, INTNETHDR *) == pHdr);
377	Assert(IntNetIsValidFrameType(pHdr->u16Type));
378
379	/* skip the frame */
380	uint32_t offReadNew = offReadOld + pHdr->offFrame + pHdr->cbFrame;
381	offReadNew = RT_ALIGN_32(offReadNew, INTNETHDR_ALIGNMENT);
382	Assert(offReadNew <= pRingBuf->offEnd && offReadNew >= pRingBuf->offStart);
383	if (offReadNew >= pRingBuf->offEnd)
384	offReadNew = pRingBuf->offStart;
385	Log2(("IntNetRingSkipFrame: offReadX: %#x -> %#x (1)\n", offReadOld, offReadNew));
386	#ifdef INTNET_POISON_READ_FRAMES
387	memset((uint8_t *)pHdr + pHdr->offFrame, 0xfe, RT_ALIGN_32(pHdr->cbFrame, INTNETHDR_ALIGNMENT));
388	memset(pHdr, 0xef, sizeof(*pHdr));
389	#endif
390	ASMAtomicWriteU32(&pRingBuf->offReadX, offReadNew);
391	}
392
393
394	/**
395	* Allocates a frame in the specified ring.
396	*
397	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
398	* @param pRingBuf The ring buffer.
399	* @param cbFrame The frame size.
400	* @param ppHdr Where to return the frame header.
401	* Don't touch this!
402	* @param ppvFrame Where to return the frame pointer.
403	*/
404	DECLINLINE(int) intnetRingAllocateFrameInternal(PINTNETRINGBUF pRingBuf, uint32_t cbFrame, uint16_t u16Type,
405	PINTNETHDR ppHdr, void *ppvFrame)
406	{
407	/*
408	* Validate input and adjust the input.
409	*/
410	INTNETRINGBUF_ASSERT_SANITY(pRingBuf);
411	Assert(cbFrame >= sizeof(RTMAC) * 2);
412
413	const uint32_t cb = RT_ALIGN_32(cbFrame, INTNETHDR_ALIGNMENT);
414	uint32_t offWriteInt = ASMAtomicUoReadU32(&pRingBuf->offWriteInt);
415	uint32_t offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
416	if (offRead <= offWriteInt)
417	{
418	/*
419	* Try fit it all before the end of the buffer.
420	*/
421	if (pRingBuf->offEnd - offWriteInt >= cb + sizeof(INTNETHDR))
422	{
423	uint32_t offNew = offWriteInt + cb + sizeof(INTNETHDR);
424	if (offNew >= pRingBuf->offEnd)
425	offNew = pRingBuf->offStart;
426	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
427	return VERR_WRONG_ORDER; /* race */
428	Log2(("intnetRingAllocateFrameInternal: offWriteInt: %#x -> %#x (1) (R=%#x T=%#x S=%#x)\n", offWriteInt, offNew, offRead, u16Type, cbFrame));
429
430	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
431	pHdr->u16Type = u16Type;
432	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
433	pHdr->offFrame = sizeof(INTNETHDR);
434
435	*ppHdr = pHdr;
436	*ppvFrame = pHdr + 1;
437	return VINF_SUCCESS;
438	}
439	/*
440	* Try fit the frame at the start of the buffer.
441	* (The header fits before the end of the buffer because of alignment.)
442	*/
443	AssertMsg(pRingBuf->offEnd - offWriteInt >= sizeof(INTNETHDR), ("offEnd=%x offWriteInt=%x\n", pRingBuf->offEnd, offWriteInt));
444	if (offRead - pRingBuf->offStart > cb) /* not >= ! */
445	{
446	uint32_t offNew = pRingBuf->offStart + cb;
447	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
448	return VERR_WRONG_ORDER; /* race */
449	Log2(("intnetRingAllocateFrameInternal: offWriteInt: %#x -> %#x (2) (R=%#x T=%#x S=%#x)\n", offWriteInt, offNew, offRead, u16Type, cbFrame));
450
451	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
452	pHdr->u16Type = u16Type;
453	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
454	pHdr->offFrame = pRingBuf->offStart - offWriteInt;
455
456	*ppHdr = pHdr;
457	ppvFrame = (uint8_t )pRingBuf + pRingBuf->offStart;
458	return VINF_SUCCESS;
459	}
460	}
461	/*
462	* The reader is ahead of the writer, try fit it into that space.
463	*/
464	else if (offRead - offWriteInt > cb + sizeof(INTNETHDR)) /* not >= ! */
465	{
466	uint32_t offNew = offWriteInt + cb + sizeof(INTNETHDR);
467	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
468	return VERR_WRONG_ORDER; /* race */
469	Log2(("intnetRingAllocateFrameInternal: offWriteInt: %#x -> %#x (3) (R=%#x T=%#x S=%#x)\n", offWriteInt, offNew, offRead, u16Type, cbFrame));
470
471	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
472	pHdr->u16Type = u16Type;
473	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
474	pHdr->offFrame = sizeof(INTNETHDR);
475
476	*ppHdr = pHdr;
477	*ppvFrame = pHdr + 1;
478	return VINF_SUCCESS;
479	}
480
481	/* (it didn't fit) */
482	ppHdr = NULL; / shut up gcc, */
483	ppvFrame = NULL; / ditto. */
484	STAM_REL_COUNTER_INC(&pRingBuf->cOverflows);
485	return VERR_BUFFER_OVERFLOW;
486	}
487
488
489	/**
490	* Allocates a normal frame in the specified ring.
491	*
492	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
493	* @param pRingBuf The ring buffer.
494	* @param cbFrame The frame size.
495	* @param ppHdr Where to return the frame header.
496	* Don't touch this!
497	* @param ppvFrame Where to return the frame pointer.
498	*/
499	DECLINLINE(int) IntNetRingAllocateFrame(PINTNETRINGBUF pRingBuf, uint32_t cbFrame, PINTNETHDR ppHdr, void *ppvFrame)
500	{
501	return intnetRingAllocateFrameInternal(pRingBuf, cbFrame, INTNETHDR_TYPE_FRAME, ppHdr, ppvFrame);
502	}
503
504
505	/**
506	* Allocates a GSO frame in the specified ring.
507	*
508	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
509	* @param pRingBuf The ring buffer.
510	* @param cbFrame The frame size.
511	* @param pGso Pointer to the GSO context.
512	* @param ppHdr Where to return the frame header.
513	* Don't touch this!
514	* @param ppvFrame Where to return the frame pointer.
515	*/
516	DECLINLINE(int) IntNetRingAllocateGsoFrame(PINTNETRINGBUF pRingBuf, uint32_t cbFrame, PCPDMNETWORKGSO pGso,
517	PINTNETHDR ppHdr, void *ppvFrame)
518	{
519	void pvFrame = NULL; / gcc maybe used uninitialized */
520	int rc = intnetRingAllocateFrameInternal(pRingBuf, cbFrame + sizeof(*pGso), INTNETHDR_TYPE_GSO, ppHdr, &pvFrame);
521	if (RT_SUCCESS(rc))
522	{
523	PPDMNETWORKGSO pGsoCopy = (PPDMNETWORKGSO)pvFrame;
524	pGsoCopy = pGso;
525	*ppvFrame = pGsoCopy + 1;
526	}
527	return rc;
528	}
529
530
531	/**
532	* Commits a frame.
533	*
534	* Make sure to commit the frames in the order they've been allocated!
535	*
536	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
537	* @param pRingBuf The ring buffer.
538	* @param pHdr The frame header returned by
539	* IntNetRingAllocateFrame.
540	*/
541	DECLINLINE(void) IntNetRingCommitFrame(PINTNETRINGBUF pRingBuf, PINTNETHDR pHdr)
542	{
543	/*
544	* Validate input and commit order.
545	*/
546	INTNETRINGBUF_ASSERT_SANITY(pRingBuf);
547	INTNETHDR_ASSERT_SANITY(pHdr, pRingBuf);
548	Assert(pRingBuf->offWriteCom == ((uintptr_t)pHdr - (uintptr_t)pRingBuf));
549
550	/*
551	* Figure out the offWriteCom for this packet and update the ring.
552	*/
553	const uint32_t cbFrame = pHdr->cbFrame;
554	const uint32_t cb = RT_ALIGN_32(cbFrame, INTNETHDR_ALIGNMENT);
555	uint32_t offWriteCom = (uint32_t)((uintptr_t)pHdr - (uintptr_t)pRingBuf)
556	+ pHdr->offFrame
557	+ cb;
558	if (offWriteCom >= pRingBuf->offEnd)
559	{
560	Assert(offWriteCom == pRingBuf->offEnd);
561	offWriteCom = pRingBuf->offStart;
562	}
563	Log2(("IntNetRingCommitFrame: offWriteCom: %#x -> %#x (R=%#x T=%#x S=%#x)\n", pRingBuf->offWriteCom, offWriteCom, pRingBuf->offReadX, pHdr->u16Type, cbFrame));
564	ASMAtomicWriteU32(&pRingBuf->offWriteCom, offWriteCom);
565	STAM_REL_COUNTER_ADD(&pRingBuf->cbStatWritten, cbFrame);
566	STAM_REL_COUNTER_INC(&pRingBuf->cStatFrames);
567	}
568
569
570	/**
571	* Commits a frame and injects a filler frame if not all of the buffer was used.
572	*
573	* Make sure to commit the frames in the order they've been allocated!
574	*
575	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
576	* @param pRingBuf The ring buffer.
577	* @param pHdr The frame header returned by
578	* IntNetRingAllocateFrame.
579	* @param cbUsed The amount of space actually used. This does
580	* not include the GSO part.
581	*/
582	DECLINLINE(void) IntNetRingCommitFrameEx(PINTNETRINGBUF pRingBuf, PINTNETHDR pHdr, size_t cbUsed)
583	{
584	/*
585	* Validate input and commit order.
586	*/
587	INTNETRINGBUF_ASSERT_SANITY(pRingBuf);
588	INTNETHDR_ASSERT_SANITY(pHdr, pRingBuf);
589	Assert(pRingBuf->offWriteCom == ((uintptr_t)pHdr - (uintptr_t)pRingBuf));
590
591	if (pHdr->u16Type == INTNETHDR_TYPE_GSO)
592	cbUsed += sizeof(PDMNETWORKGSO);
593
594	/*
595	* Calc the new write commit offset.
596	*/
597	const uint32_t cbAlignedFrame = RT_ALIGN_32(pHdr->cbFrame, INTNETHDR_ALIGNMENT);
598	const uint32_t cbAlignedUsed = RT_ALIGN_32(cbUsed, INTNETHDR_ALIGNMENT);
599	uint32_t offWriteCom = (uint32_t)((uintptr_t)pHdr - (uintptr_t)pRingBuf)
600	+ pHdr->offFrame
601	+ cbAlignedFrame;
602	if (offWriteCom >= pRingBuf->offEnd)
603	{
604	Assert(offWriteCom == pRingBuf->offEnd);
605	offWriteCom = pRingBuf->offStart;
606	}
607
608	/*
609	* Insert a dummy frame to pad any unused space.
610	*/
611	if (cbAlignedFrame != cbAlignedUsed)
612	{
613	/** @todo Later: Try unallocate the extra memory. */
614	PINTNETHDR pHdrPadding = (PINTNETHDR)((uint8_t *)pHdr + pHdr->offFrame + cbAlignedUsed);
615	pHdrPadding->u16Type = INTNETHDR_TYPE_PADDING;
616	pHdrPadding->cbFrame = (uint16_t)(cbAlignedFrame - cbAlignedUsed - sizeof(INTNETHDR));
617	pHdrPadding->offFrame = sizeof(INTNETHDR);
618	pHdr->cbFrame = (uint16_t)cbUsed;
619	}
620
621	Log2(("IntNetRingCommitFrameEx: offWriteCom: %#x -> %#x (R=%#x T=%#x S=%#x P=%#x)\n", pRingBuf->offWriteCom, offWriteCom, pRingBuf->offReadX, pHdr->u16Type, pHdr->cbFrame, cbAlignedFrame - cbAlignedUsed));
622	ASMAtomicWriteU32(&pRingBuf->offWriteCom, offWriteCom);
623	STAM_REL_COUNTER_ADD(&pRingBuf->cbStatWritten, cbUsed);
624	STAM_REL_COUNTER_INC(&pRingBuf->cStatFrames);
625	}
626
627
628	/**
629	* Writes a frame to the specified ring.
630	*
631	* Make sure you don't have any uncommitted frames when calling this function!
632	*
633	* @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
634	* @param pRingBuf The ring buffer.
635	* @param pvFrame The bits to write.
636	* @param cbFrame How much to write.
637	*/
638	DECLINLINE(int) IntNetRingWriteFrame(PINTNETRINGBUF pRingBuf, const void *pvFrame, size_t cbFrame)
639	{
640	/*
641	* Validate input.
642	*/
643	INTNETRINGBUF_ASSERT_SANITY(pRingBuf);
644	Assert(cbFrame >= sizeof(RTMAC) * 2);
645
646	/*
647	* Align the size and read the volatile ring buffer variables.
648	*/
649	const uint32_t cb = RT_ALIGN_32(cbFrame, INTNETHDR_ALIGNMENT);
650	uint32_t offWriteInt = ASMAtomicUoReadU32(&pRingBuf->offWriteInt);
651	uint32_t offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
652	if (offRead <= offWriteInt)
653	{
654	/*
655	* Try fit it all before the end of the buffer.
656	*/
657	if (pRingBuf->offEnd - offWriteInt >= cb + sizeof(INTNETHDR))
658	{
659	uint32_t offNew = offWriteInt + cb + sizeof(INTNETHDR);
660	if (offNew >= pRingBuf->offEnd)
661	offNew = pRingBuf->offStart;
662	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
663	return VERR_WRONG_ORDER; /* race */
664	Log2(("IntNetRingWriteFrame: offWriteInt: %#x -> %#x (1)\n", offWriteInt, offNew));
665
666	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
667	pHdr->u16Type = INTNETHDR_TYPE_FRAME;
668	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
669	pHdr->offFrame = sizeof(INTNETHDR);
670
671	memcpy(pHdr + 1, pvFrame, cbFrame);
672
673	Log2(("IntNetRingWriteFrame: offWriteCom: %#x -> %#x (1)\n", pRingBuf->offWriteCom, offNew));
674	ASMAtomicWriteU32(&pRingBuf->offWriteCom, offNew);
675	STAM_REL_COUNTER_ADD(&pRingBuf->cbStatWritten, cbFrame);
676	STAM_REL_COUNTER_INC(&pRingBuf->cStatFrames);
677	return VINF_SUCCESS;
678	}
679	/*
680	* Try fit the frame at the start of the buffer.
681	* (The header fits before the end of the buffer because of alignment.)
682	*/
683	AssertMsg(pRingBuf->offEnd - offWriteInt >= sizeof(INTNETHDR), ("offEnd=%x offWriteInt=%x\n", pRingBuf->offEnd, offWriteInt));
684	if (offRead - pRingBuf->offStart > cb) /* not >= ! */
685	{
686	uint32_t offNew = pRingBuf->offStart + cb;
687	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
688	return VERR_WRONG_ORDER; /* race */
689	Log2(("IntNetRingWriteFrame: offWriteInt: %#x -> %#x (2)\n", offWriteInt, offNew));
690
691	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
692	pHdr->u16Type = INTNETHDR_TYPE_FRAME;
693	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
694	pHdr->offFrame = pRingBuf->offStart - offWriteInt;
695
696	memcpy((uint8_t *)pRingBuf + pRingBuf->offStart, pvFrame, cbFrame);
697
698	Log2(("IntNetRingWriteFrame: offWriteCom: %#x -> %#x (2)\n", pRingBuf->offWriteCom, offNew));
699	ASMAtomicWriteU32(&pRingBuf->offWriteCom, offNew);
700	STAM_REL_COUNTER_ADD(&pRingBuf->cbStatWritten, cbFrame);
701	STAM_REL_COUNTER_INC(&pRingBuf->cStatFrames);
702	return VINF_SUCCESS;
703	}
704	}
705	/*
706	* The reader is ahead of the writer, try fit it into that space.
707	*/
708	else if (offRead - offWriteInt > cb + sizeof(INTNETHDR)) /* not >= ! */
709	{
710	uint32_t offNew = offWriteInt + cb + sizeof(INTNETHDR);
711	if (RT_UNLIKELY(!ASMAtomicCmpXchgU32(&pRingBuf->offWriteInt, offNew, offWriteInt)))
712	return VERR_WRONG_ORDER; /* race */
713	Log2(("IntNetRingWriteFrame: offWriteInt: %#x -> %#x (3)\n", offWriteInt, offNew));
714
715	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offWriteInt);
716	pHdr->u16Type = INTNETHDR_TYPE_FRAME;
717	pHdr->cbFrame = (uint16_t)cbFrame; Assert(pHdr->cbFrame == cbFrame);
718	pHdr->offFrame = sizeof(INTNETHDR);
719
720	memcpy(pHdr + 1, pvFrame, cbFrame);
721
722	Log2(("IntNetRingWriteFrame: offWriteCom: %#x -> %#x (3)\n", pRingBuf->offWriteCom, offNew));
723	ASMAtomicWriteU32(&pRingBuf->offWriteCom, offNew);
724	STAM_REL_COUNTER_ADD(&pRingBuf->cbStatWritten, cbFrame);
725	STAM_REL_COUNTER_INC(&pRingBuf->cStatFrames);
726	return VINF_SUCCESS;
727	}
728
729	/* (it didn't fit) */
730	STAM_REL_COUNTER_INC(&pRingBuf->cOverflows);
731	return VERR_BUFFER_OVERFLOW;
732	}
733
734
735	/**
736	* Reads the next frame in the buffer and moves the read cursor past it.
737	*
738	* @returns Size of the frame in bytes. 0 is returned if nothing in the buffer.
739	* @param pRingBuff The ring buffer to read from.
740	* @param pvFrameDst Where to put the frame. The caller is responsible for
741	* ensuring that there is sufficient space for the frame.
742	*
743	* @deprecated Bad interface, do NOT use it! Only for tstIntNetR0.
744	*/
745	DECLINLINE(uint32_t) IntNetRingReadAndSkipFrame(PINTNETRINGBUF pRingBuf, void *pvFrameDst)
746	{
747	INTNETRINGBUF_ASSERT_SANITY(pRingBuf);
748
749	uint32_t offRead = ASMAtomicUoReadU32(&pRingBuf->offReadX);
750	uint32_t const offWriteCom = ASMAtomicUoReadU32(&pRingBuf->offWriteCom);
751	if (offRead == offWriteCom)
752	return 0;
753
754	PINTNETHDR pHdr = (PINTNETHDR)((uint8_t *)pRingBuf + offRead);
755	INTNETHDR_ASSERT_SANITY(pHdr, pRingBuf);
756
757	uint32_t const cbFrame = pHdr->cbFrame;
758	int32_t const offFrame = pHdr->offFrame;
759	const void pvFrameSrc = (uint8_t )pHdr + offFrame;
760	memcpy(pvFrameDst, pvFrameSrc, cbFrame);
761	#ifdef INTNET_POISON_READ_FRAMES
762	memset((void *)pvFrameSrc, 0xfe, RT_ALIGN_32(cbFrame, INTNETHDR_ALIGNMENT));
763	memset(pHdr, 0xef, sizeof(*pHdr));
764	#endif
765
766	/* skip the frame */
767	offRead += offFrame + cbFrame;
768	offRead = RT_ALIGN_32(offRead, INTNETHDR_ALIGNMENT);
769	Assert(offRead <= pRingBuf->offEnd && offRead >= pRingBuf->offStart);
770	if (offRead >= pRingBuf->offEnd)
771	offRead = pRingBuf->offStart;
772	ASMAtomicWriteU32(&pRingBuf->offReadX, offRead);
773	return cbFrame;
774	}
775
776
777	/**
778	* Initializes a buffer structure.
779	*
780	* @param pIntBuf The internal networking interface buffer. This
781	* expected to be cleared prior to calling this
782	* function.
783	* @param cbBuf The size of the whole buffer.
784	* @param cbRecv The receive size.
785	* @param cbSend The send size.
786	*/
787	DECLINLINE(void) IntNetBufInit(PINTNETBUF pIntBuf, uint32_t cbBuf, uint32_t cbRecv, uint32_t cbSend)
788	{
789	AssertCompileSizeAlignment(INTNETBUF, INTNETHDR_ALIGNMENT);
790	AssertCompileSizeAlignment(INTNETBUF, INTNETRINGBUF_ALIGNMENT);
791	Assert(cbBuf >= sizeof(INTNETBUF) + cbRecv + cbSend);
792	Assert(RT_ALIGN_32(cbRecv, INTNETRINGBUF_ALIGNMENT) == cbRecv);
793	Assert(RT_ALIGN_32(cbSend, INTNETRINGBUF_ALIGNMENT) == cbSend);
794	Assert(ASMMemIsAll8(pIntBuf, cbBuf, '\0') == NULL);
795
796	pIntBuf->u32Magic = INTNETBUF_MAGIC;
797	pIntBuf->cbBuf = cbBuf;
798	pIntBuf->cbRecv = cbRecv;
799	pIntBuf->cbSend = cbSend;
800
801	/* receive ring buffer. */
802	uint32_t offBuf = RT_ALIGN_32(sizeof(INTNETBUF), INTNETRINGBUF_ALIGNMENT) - RT_OFFSETOF(INTNETBUF, Recv);
803	pIntBuf->Recv.offStart = offBuf;
804	pIntBuf->Recv.offReadX = offBuf;
805	pIntBuf->Recv.offWriteInt = offBuf;
806	pIntBuf->Recv.offWriteCom = offBuf;
807	pIntBuf->Recv.offEnd = offBuf + cbRecv;
808
809	/* send ring buffer. */
810	offBuf += cbRecv + RT_OFFSETOF(INTNETBUF, Recv) - RT_OFFSETOF(INTNETBUF, Send);
811	pIntBuf->Send.offStart = offBuf;
812	pIntBuf->Send.offReadX = offBuf;
813	pIntBuf->Send.offWriteCom = offBuf;
814	pIntBuf->Send.offWriteInt = offBuf;
815	pIntBuf->Send.offEnd = offBuf + cbSend;
816	Assert(cbBuf >= offBuf + cbSend);
817	}
818
819	#endif /* __cplusplus */
820
821	#endif
822

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source: vbox/trunk/include/VBox/intnetinline.h@ 38643

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