aboutsummaryrefslogtreecommitdiffstats
path: root/lib/librte_vhost/rte_vhost.h
blob: f65364495586d5730e1d27a9b7c57871523b6305 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_VHOST_H_
#define _RTE_VHOST_H_

/**
 * @file
 * Interface to vhost-user
 */

#include <stdint.h>
#include <sys/eventfd.h>

#include <rte_memory.h>
#include <rte_mempool.h>

#ifdef __cplusplus
extern "C" {
#endif

/* These are not C++-aware. */
#include <linux/vhost.h>
#include <linux/virtio_ring.h>

#define RTE_VHOST_USER_CLIENT		(1ULL << 0)
#define RTE_VHOST_USER_NO_RECONNECT	(1ULL << 1)
#define RTE_VHOST_USER_DEQUEUE_ZERO_COPY	(1ULL << 2)
#define RTE_VHOST_USER_IOMMU_SUPPORT	(1ULL << 3)

/**
 * Information relating to memory regions including offsets to
 * addresses in QEMUs memory file.
 */
struct rte_vhost_mem_region {
	uint64_t guest_phys_addr;
	uint64_t guest_user_addr;
	uint64_t host_user_addr;
	uint64_t size;
	void	 *mmap_addr;
	uint64_t mmap_size;
	int fd;
};

/**
 * Memory structure includes region and mapping information.
 */
struct rte_vhost_memory {
	uint32_t nregions;
	struct rte_vhost_mem_region regions[];
};

struct rte_vhost_vring {
	struct vring_desc	*desc;
	struct vring_avail	*avail;
	struct vring_used	*used;
	uint64_t		log_guest_addr;

	int			callfd;
	int			kickfd;
	uint16_t		size;
};

/**
 * Device and vring operations.
 */
struct vhost_device_ops {
	int (*new_device)(int vid);		/**< Add device. */
	void (*destroy_device)(int vid);	/**< Remove device. */

	int (*vring_state_changed)(int vid, uint16_t queue_id, int enable);	/**< triggered when a vring is enabled or disabled */

	/**
	 * Features could be changed after the feature negotiation.
	 * For example, VHOST_F_LOG_ALL will be set/cleared at the
	 * start/end of live migration, respectively. This callback
	 * is used to inform the application on such change.
	 */
	int (*features_changed)(int vid, uint64_t features);

	int (*new_connection)(int vid);
	void (*destroy_connection)(int vid);

	void *reserved[2]; /**< Reserved for future extension */
};

/**
 * Convert guest physical address to host virtual address
 *
 * @param mem
 *  the guest memory regions
 * @param gpa
 *  the guest physical address for querying
 * @return
 *  the host virtual address on success, 0 on failure
 */
static __rte_always_inline uint64_t
rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa)
{
	struct rte_vhost_mem_region *reg;
	uint32_t i;

	for (i = 0; i < mem->nregions; i++) {
		reg = &mem->regions[i];
		if (gpa >= reg->guest_phys_addr &&
		    gpa <  reg->guest_phys_addr + reg->size) {
			return gpa - reg->guest_phys_addr +
			       reg->host_user_addr;
		}
	}

	return 0;
}

#define RTE_VHOST_NEED_LOG(features)	((features) & (1ULL << VHOST_F_LOG_ALL))

/**
 * Log the memory write start with given address.
 *
 * This function only need be invoked when the live migration starts.
 * Therefore, we won't need call it at all in the most of time. For
 * making the performance impact be minimum, it's suggested to do a
 * check before calling it:
 *
 *        if (unlikely(RTE_VHOST_NEED_LOG(features)))
 *                rte_vhost_log_write(vid, addr, len);
 *
 * @param vid
 *  vhost device ID
 * @param addr
 *  the starting address for write
 * @param len
 *  the length to write
 */
void rte_vhost_log_write(int vid, uint64_t addr, uint64_t len);

/**
 * Log the used ring update start at given offset.
 *
 * Same as rte_vhost_log_write, it's suggested to do a check before
 * calling it:
 *
 *        if (unlikely(RTE_VHOST_NEED_LOG(features)))
 *                rte_vhost_log_used_vring(vid, vring_idx, offset, len);
 *
 * @param vid
 *  vhost device ID
 * @param vring_idx
 *  the vring index
 * @param offset
 *  the offset inside the used ring
 * @param len
 *  the length to write
 */
void rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
			      uint64_t offset, uint64_t len);

int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable);

/**
 * Register vhost driver. path could be different for multiple
 * instance support.
 */
int rte_vhost_driver_register(const char *path, uint64_t flags);

/* Unregister vhost driver. This is only meaningful to vhost user. */
int rte_vhost_driver_unregister(const char *path);

/**
 * Set the feature bits the vhost-user driver supports.
 *
 * @param path
 *  The vhost-user socket file path
 * @param features
 *  Supported features
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_driver_set_features(const char *path, uint64_t features);

/**
 * Enable vhost-user driver features.
 *
 * Note that
 * - the param features should be a subset of the feature bits provided
 *   by rte_vhost_driver_set_features().
 * - it must be invoked before vhost-user negotiation starts.
 *
 * @param path
 *  The vhost-user socket file path
 * @param features
 *  Features to enable
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_driver_enable_features(const char *path, uint64_t features);

/**
 * Disable vhost-user driver features.
 *
 * The two notes at rte_vhost_driver_enable_features() also apply here.
 *
 * @param path
 *  The vhost-user socket file path
 * @param features
 *  Features to disable
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_driver_disable_features(const char *path, uint64_t features);

/**
 * Get the feature bits before feature negotiation.
 *
 * @param path
 *  The vhost-user socket file path
 * @param features
 *  A pointer to store the queried feature bits
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_driver_get_features(const char *path, uint64_t *features);

/**
 * Get the feature bits after negotiation
 *
 * @param vid
 *  Vhost device ID
 * @param features
 *  A pointer to store the queried feature bits
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_get_negotiated_features(int vid, uint64_t *features);

/* Register callbacks. */
int rte_vhost_driver_callback_register(const char *path,
	struct vhost_device_ops const * const ops);

/**
 *
 * Start the vhost-user driver.
 *
 * This function triggers the vhost-user negotiation.
 *
 * @param path
 *  The vhost-user socket file path
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_driver_start(const char *path);

/**
 * Get the MTU value of the device if set in QEMU.
 *
 * @param vid
 *  virtio-net device ID
 * @param mtu
 *  The variable to store the MTU value
 *
 * @return
 *  0: success
 *  -EAGAIN: device not yet started
 *  -ENOTSUP: device does not support MTU feature
 */
int rte_vhost_get_mtu(int vid, uint16_t *mtu);

/**
 * Get the numa node from which the virtio net device's memory
 * is allocated.
 *
 * @param vid
 *  vhost device ID
 *
 * @return
 *  The numa node, -1 on failure
 */
int rte_vhost_get_numa_node(int vid);

/**
 * @deprecated
 * Get the number of queues the device supports.
 *
 * Note this function is deprecated, as it returns a queue pair number,
 * which is vhost specific. Instead, rte_vhost_get_vring_num should
 * be used.
 *
 * @param vid
 *  vhost device ID
 *
 * @return
 *  The number of queues, 0 on failure
 */
__rte_deprecated
uint32_t rte_vhost_get_queue_num(int vid);

/**
 * Get the number of vrings the device supports.
 *
 * @param vid
 *  vhost device ID
 *
 * @return
 *  The number of vrings, 0 on failure
 */
uint16_t rte_vhost_get_vring_num(int vid);

/**
 * Get the virtio net device's ifname, which is the vhost-user socket
 * file path.
 *
 * @param vid
 *  vhost device ID
 * @param buf
 *  The buffer to stored the queried ifname
 * @param len
 *  The length of buf
 *
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_get_ifname(int vid, char *buf, size_t len);

/**
 * Get how many avail entries are left in the queue
 *
 * @param vid
 *  vhost device ID
 * @param queue_id
 *  virtio queue index
 *
 * @return
 *  num of avail entires left
 */
uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id);

struct rte_mbuf;
struct rte_mempool;
/**
 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
 * be received from the physical port or from another virtual device. A packet
 * count is returned to indicate the number of packets that were successfully
 * added to the RX queue.
 * @param vid
 *  vhost device ID
 * @param queue_id
 *  virtio queue index in mq case
 * @param pkts
 *  array to contain packets to be enqueued
 * @param count
 *  packets num to be enqueued
 * @return
 *  num of packets enqueued
 */
uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
	struct rte_mbuf **pkts, uint16_t count);

/**
 * This function gets guest buffers from the virtio device TX virtqueue,
 * construct host mbufs, copies guest buffer content to host mbufs and
 * store them in pkts to be processed.
 * @param vid
 *  vhost device ID
 * @param queue_id
 *  virtio queue index in mq case
 * @param mbuf_pool
 *  mbuf_pool where host mbuf is allocated.
 * @param pkts
 *  array to contain packets to be dequeued
 * @param count
 *  packets num to be dequeued
 * @return
 *  num of packets dequeued
 */
uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);

/**
 * Get guest mem table: a list of memory regions.
 *
 * An rte_vhost_vhost_memory object will be allocated internaly, to hold the
 * guest memory regions. Application should free it at destroy_device()
 * callback.
 *
 * @param vid
 *  vhost device ID
 * @param mem
 *  To store the returned mem regions
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);

/**
 * Get guest vring info, including the vring address, vring size, etc.
 *
 * @param vid
 *  vhost device ID
 * @param vring_idx
 *  vring index
 * @param vring
 *  the structure to hold the requested vring info
 * @return
 *  0 on success, -1 on failure
 */
int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
			      struct rte_vhost_vring *vring);

/**
 * Get vhost RX queue avail count.
 *
 * @param vid
 *  vhost device ID
 * @param qid
 *  virtio queue index in mq case
 * @return
 *  num of desc available
 */
uint32_t rte_vhost_rx_queue_count(int vid, uint16_t qid);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_VHOST_H_ */