summaryrefslogtreecommitdiffstats
path: root/drivers/bus/vmbus/rte_bus_vmbus.h
blob: 4cf73ce8151386670cd06fa87741899216000563 (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
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright (c) 2018, Microsoft Corporation.
 * All Rights Reserved.
 */

#ifndef _VMBUS_H_
#define _VMBUS_H_

/**
 * @file
 *
 * VMBUS Interface
 */
#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <stdbool.h>
#include <errno.h>
#include <sys/queue.h>
#include <stdint.h>
#include <inttypes.h>

#include <rte_compat.h>
#include <rte_uuid.h>
#include <rte_debug.h>
#include <rte_interrupts.h>
#include <rte_dev.h>
#include <rte_vmbus_reg.h>

/* Forward declarations */
struct rte_vmbus_device;
struct rte_vmbus_driver;
struct rte_vmbus_bus;
struct vmbus_channel;
struct vmbus_mon_page;

TAILQ_HEAD(rte_vmbus_device_list, rte_vmbus_device);
TAILQ_HEAD(rte_vmbus_driver_list, rte_vmbus_driver);

/* VMBus iterators */
#define FOREACH_DEVICE_ON_VMBUS(p)	\
	TAILQ_FOREACH(p, &(rte_vmbus_bus.device_list), next)

#define FOREACH_DRIVER_ON_VMBUS(p)	\
	TAILQ_FOREACH(p, &(rte_vmbus_bus.driver_list), next)

/** Maximum number of VMBUS resources. */
enum hv_uio_map {
	HV_TXRX_RING_MAP = 0,
	HV_INT_PAGE_MAP,
	HV_MON_PAGE_MAP,
	HV_RECV_BUF_MAP,
	HV_SEND_BUF_MAP
};
#define VMBUS_MAX_RESOURCE 5

/**
 * A structure describing a VMBUS device.
 */
struct rte_vmbus_device {
	TAILQ_ENTRY(rte_vmbus_device) next;    /**< Next probed VMBUS device */
	const struct rte_vmbus_driver *driver; /**< Associated driver */
	struct rte_device device;              /**< Inherit core device */
	rte_uuid_t device_id;		       /**< VMBUS device id */
	rte_uuid_t class_id;		       /**< VMBUS device type */
	uint32_t relid;			       /**< id for primary */
	uint8_t monitor_id;		       /**< monitor page */
	int uio_num;			       /**< UIO device number */
	uint32_t *int_page;		       /**< VMBUS interrupt page */
	struct vmbus_channel *primary;	       /**< VMBUS primary channel */
	struct vmbus_mon_page *monitor_page;   /**< VMBUS monitor page */

	struct rte_intr_handle intr_handle;    /**< Interrupt handle */
	struct rte_mem_resource resource[VMBUS_MAX_RESOURCE];
};

/**
 * Initialization function for the driver called during VMBUS probing.
 */
typedef int (vmbus_probe_t)(struct rte_vmbus_driver *,
			    struct rte_vmbus_device *);

/**
 * Initialization function for the driver called during hot plugging.
 */
typedef int (vmbus_remove_t)(struct rte_vmbus_device *);

/**
 * A structure describing a VMBUS driver.
 */
struct rte_vmbus_driver {
	TAILQ_ENTRY(rte_vmbus_driver) next; /**< Next in list. */
	struct rte_driver driver;
	struct rte_vmbus_bus *bus;          /**< VM bus reference. */
	vmbus_probe_t *probe;               /**< Device Probe function. */
	vmbus_remove_t *remove;             /**< Device Remove function. */

	const rte_uuid_t *id_table;	    /**< ID table. */
};


/**
 * Structure describing the VM bus
 */
struct rte_vmbus_bus {
	struct rte_bus bus;               /**< Inherit the generic class */
	struct rte_vmbus_device_list device_list;  /**< List of devices */
	struct rte_vmbus_driver_list driver_list;  /**< List of drivers */
};

/**
 * Scan the content of the VMBUS bus, and the devices in the devices
 * list
 *
 * @return
 *  0 on success, negative on error
 */
int rte_vmbus_scan(void);

/**
 * Probe the VMBUS bus
 *
 * @return
 *   - 0 on success.
 *   - !0 on error.
 */
int rte_vmbus_probe(void);

/**
 * Map the VMBUS device resources in user space virtual memory address
 *
 * @param dev
 *   A pointer to a rte_vmbus_device structure describing the device
 *   to use
 *
 * @return
 *   0 on success, negative on error and positive if no driver
 *   is found for the device.
 */
int rte_vmbus_map_device(struct rte_vmbus_device *dev);

/**
 * Unmap this device
 *
 * @param dev
 *   A pointer to a rte_vmbus_device structure describing the device
 *   to use
 */
void rte_vmbus_unmap_device(struct rte_vmbus_device *dev);

/**
 * Get connection to primary VMBUS channel
 *
 * @param device
 *   A pointer to a rte_vmbus_device structure describing the device
 * @param chan
 *   A pointer to a VMBUS channel pointer that will be filled.
 * @return
 *   - 0 Success; channel opened.
 *   - -ENOMEM: Not enough memory available.
 *   - -EINVAL: Regions could not be mapped.
 */
int rte_vmbus_chan_open(struct rte_vmbus_device *device,
			struct vmbus_channel **chan);

/**
 * Free connection to VMBUS channel
 *
 * @param chan
 *    VMBUS channel
 */
void rte_vmbus_chan_close(struct vmbus_channel *chan);

/**
 * Gets the maximum number of channels supported on device
 *
 * @param device
 *   A pointer to a rte_vmbus_device structure describing the device
 * @return
 *   Number of channels available.
 */
int rte_vmbus_max_channels(const struct rte_vmbus_device *device);

/**
 * Get a connection to new secondary vmbus channel
 *
 * @param primary
 *   A pointer to primary VMBUS channel
 * @param chan
 *   A pointer to a secondary VMBUS channel pointer that will be filled.
 * @return
 *   - 0 Success; channel opened.
 *   - -ENOMEM: Not enough memory available.
 *   - -EINVAL: Regions could not be mapped.
 */
int rte_vmbus_subchan_open(struct vmbus_channel *primary,
			   struct vmbus_channel **new_chan);

/**
 * Disable IRQ for device
 *
 * @param device
 *    VMBUS device
 */
void rte_vmbus_irq_mask(struct rte_vmbus_device *device);

/**
 * Enable IRQ for device
 *
 * @param device
 *    VMBUS device
 */
void rte_vmbus_irq_unmask(struct rte_vmbus_device *device);

/**
 * Read (and wait) for IRQ
 *
 * @param device
 *    VMBUS device
 */
int rte_vmbus_irq_read(struct rte_vmbus_device *device);

/**
 * Test if channel is empty
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @return
 *	Return true if no data present in incoming ring.
 */
bool rte_vmbus_chan_rx_empty(const struct vmbus_channel *channel);

/**
 * Send the specified buffer on the given channel
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @param type
 *	Type of packet that is being send e.g. negotiate, time
 *	packet etc.
 * @param data
 *	Pointer to the buffer to send
 * @param dlen
 *	Number of bytes of data to send
 * @param xact
 *	Identifier of the request
 * @param flags
 *	Message type inband, rxbuf, gpa
 * @param need_sig
 *	Is host signal tx is required (optional)
 *
 * Sends data in buffer directly to hyper-v via the vmbus
 */
int rte_vmbus_chan_send(struct vmbus_channel *channel, uint16_t type,
			void *data, uint32_t dlen,
			uint64_t xact, uint32_t flags, bool *need_sig);

/**
 * Explicitly signal host that data is available
 *
 * @param
 *	Pointer to vmbus_channel structure.
 *
 * Used when batching multiple sends and only signaling host
 * after the last send.
 */
void rte_vmbus_chan_signal_tx(const struct vmbus_channel *channel);

/* Structure for scatter/gather I/O */
struct iova_list {
	rte_iova_t	addr;
	uint32_t	len;
};
#define MAX_PAGE_BUFFER_COUNT		32

/**
 * Send a scattered buffer on the given channel
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @param type
 *	Type of packet that is being send e.g. negotiate, time
 *	packet etc.
 * @param gpa
 *	Array of buffers to send
 * @param gpacnt
 *	Number of elements in iov
 * @param data
 *	Pointer to the buffer additional data to send
 * @param dlen
 *	 Maximum size of what the the buffer will hold
 * @param xact
 *	Identifier of the request
 * @param flags
 *	Message type inband, rxbuf, gpa
 * @param need_sig
 *	Is host signal tx is required (optional)
 *
 * Sends data in buffer directly to hyper-v via the vmbus
 */
int rte_vmbus_chan_send_sglist(struct vmbus_channel *channel,
			       struct vmbus_gpa gpa[], uint32_t gpacnt,
			       void *data, uint32_t dlen,
			       uint64_t xact, bool *need_sig);
/**
 * Receive response to request on the given channel
 * skips the channel header.
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @param data
 *	Pointer to the buffer you want to receive the data into.
 * @param len
 *	Pointer to size of receive buffer (in/out)
 * @param
 *	Pointer to received transaction_id
 * @return
 *   On success, returns 0
 *   On failure, returns negative errno.
 */
int rte_vmbus_chan_recv(struct vmbus_channel *chan,
			void *data, uint32_t *len,
			uint64_t *request_id);

/**
 * Receive response to request on the given channel
 * includes the channel header.
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @param data
 *	Pointer to the buffer you want to receive the data into.
 * @param len
 *	Pointer to size of receive buffer (in/out)
 * @return
 *   On success, returns number of bytes read.
 *   On failure, returns negative errno.
 */
int rte_vmbus_chan_recv_raw(struct vmbus_channel *chan,
			    void *data, uint32_t *len);

/**
 * Notify host of bytes read (after recv_raw)
 * Signals host if required.
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @param bytes_read
 *	Number of bytes read since last signal
 */
void rte_vmbus_chan_signal_read(struct vmbus_channel *chan, uint32_t bytes_read);

/**
 * Determine sub channel index of the given channel
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 * @return
 *   Sub channel index (0 for primary)
 */
uint16_t rte_vmbus_sub_channel_index(const struct vmbus_channel *chan);

/**
 * Set the host monitor latency hint
 *
 * @param dev
 *    VMBUS device
 * @param chan
 *	Pointer to vmbus_channel structure.
 * @param latency
 *	Approximate wait period between hypervisor examinations of
 *	the trigger page (in nanoseconds).
 */
void rte_vmbus_set_latency(const struct rte_vmbus_device *dev,
			   const struct vmbus_channel *chan,
			   uint32_t latency);

/**
 * Register a VMBUS driver.
 *
 * @param driver
 *   A pointer to a rte_vmbus_driver structure describing the driver
 *   to be registered.
 */
void rte_vmbus_register(struct rte_vmbus_driver *driver);

/**
 * For debug dump contents of ring buffer.
 *
 * @param channel
 *	Pointer to vmbus_channel structure.
 */
void rte_vmbus_chan_dump(FILE *f, const struct vmbus_channel *chan);

/**
 * Unregister a VMBUS driver.
 *
 * @param driver
 *   A pointer to a rte_vmbus_driver structure describing the driver
 *   to be unregistered.
 */
void rte_vmbus_unregister(struct rte_vmbus_driver *driver);

/** Helper for VMBUS device registration from driver instance */
#define RTE_PMD_REGISTER_VMBUS(nm, vmbus_drv)		\
	RTE_INIT(vmbusinitfn_ ##nm)			\
	{						\
		(vmbus_drv).driver.name = RTE_STR(nm);	\
		rte_vmbus_register(&vmbus_drv);		\
	}						\
	RTE_PMD_EXPORT_NAME(nm, __COUNTER__)

#ifdef __cplusplus
}
#endif

#endif /* _VMBUS_H_ */