aboutsummaryrefslogtreecommitdiffstats
path: root/src/svm/fifo_segment.h
blob: 268b48b39f645a04e3d730b77016a8ab7ea1c632 (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
/*
 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef __included_fifo_segment_h__
#define __included_fifo_segment_h__

#include <svm/ssvm.h>
#include <svm/fifo_types.h>
#include <svm/message_queue.h>
#include <svm/svm_fifo.h>

typedef enum
{
  FIFO_SEGMENT_FTYPE_NONE = -1,
  FIFO_SEGMENT_RX_FIFO = 0,
  FIFO_SEGMENT_TX_FIFO,
  FIFO_SEGMENT_N_FTYPES
} fifo_segment_ftype_t;

#define FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE 12	/**< 4kB min fifo size */
#define FIFO_SEGMENT_MIN_FIFO_SIZE 4096		/**< 4kB min fifo size */
#define FIFO_SEGMENT_MAX_FIFO_SIZE (2ULL << 30)	/**< 2GB max fifo size */
#define FIFO_SEGMENT_ALLOC_BATCH_SIZE 32	/* Allocation quantum */

typedef enum fifo_segment_flags_
{
  FIFO_SEGMENT_F_IS_PREALLOCATED = 1 << 0,
  FIFO_SEGMENT_F_WILL_DELETE = 1 << 1,
  FIFO_SEGMENT_F_MEM_LIMIT = 1 << 2,
} fifo_segment_flags_t;

#define foreach_segment_mem_status	\
_(NO_PRESSURE, "No pressure")		\
_(LOW_PRESSURE, "Low pressure")		\
_(HIGH_PRESSURE, "High pressure")	\
_(NO_MEMORY, "No memory")

typedef enum
{
#define _(sym,str)  MEMORY_PRESSURE_##sym,
  foreach_segment_mem_status
#undef _
    MEMORY_N_PRESSURE,
} fifo_segment_mem_status_t;

#if 0
typedef enum fifo_segment_mem_status_
{
  MEMORY_PRESSURE_NO_PRESSURE,
  MEMORY_PRESSURE_LOW_PRESSURE,
  MEMORY_PRESSURE_HIGH_PRESSURE,
  MEMORY_PRESSURE_NO_MEMORY,
} fifo_segment_mem_status_t;
#endif

typedef struct
{
  ssvm_private_t ssvm;		/**< ssvm segment data */
  fifo_segment_header_t *h;	/**< fifo segment data */
  uword max_byte_index;
  u8 n_slices;			/**< number of fifo segment slices */
  fifo_slice_private_t *slices; /**< private slice information */
  svm_msg_q_t *mqs;		/**< private vec of attached mqs */
} fifo_segment_t;

typedef struct
{
  fifo_segment_t *segments;	/**< pool of fifo segments */
  uword next_baseva;		/**< Where to put the next one */
  u32 timeout_in_seconds;	/**< Time to wait during attach */
} fifo_segment_main_t;

typedef struct
{
  ssvm_segment_type_t segment_type;	/**< type of segment requested */
  u32 segment_size;			/**< size of the segment */
  int memfd_fd;				/**< fd for memfd segments */
  char *segment_name;			/**< segment name */
  u32 *new_segment_indices;		/**< return vec of new seg indices */
} fifo_segment_create_args_t;

#define fifo_segment_flags(_fs) _fs->h->flags

int fifo_segment_init (fifo_segment_t * fs);
int fifo_segment_create (fifo_segment_main_t * sm,
			 fifo_segment_create_args_t * a);
int fifo_segment_attach (fifo_segment_main_t * sm,
			 fifo_segment_create_args_t * a);
void fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * fs);
void fifo_segment_cleanup (fifo_segment_t *fs);
fifo_segment_t *fifo_segment_get_segment (fifo_segment_main_t * sm,
					  u32 fs_index);
u32 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * fs);
void fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size);

always_inline void *
fifo_segment_ptr (fifo_segment_t *fs, uword offset)
{
  return (void *) ((u8 *) fs->h + offset);
}

always_inline uword
fifo_segment_offset (fifo_segment_t *fs, void *p)
{
  return (uword) ((u8 *) p - (u8 *) fs->h);
}

/**
 * Allocate fifo in fifo segment
 *
 * @param fs		fifo segment for fifo
 * @param data_bytes	size of default fifo chunk in bytes
 * @param ftype		fifo type @ref fifo_segment_ftype_t
 * @return		new fifo or 0 if alloc failed
 */
svm_fifo_t *fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs,
					     u32 slice_index,
					     u32 data_bytes,
					     fifo_segment_ftype_t ftype);
svm_fifo_t *fifo_segment_alloc_fifo_w_offset (fifo_segment_t *fs,
					      uword offset);

/**
 * Free fifo allocated in fifo segment
 *
 * @param fs		fifo segment for fifo
 * @param f		fifo to be freed
 */
void fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f);

void fifo_segment_detach_fifo (fifo_segment_t *fs, svm_fifo_t **f);
void fifo_segment_attach_fifo (fifo_segment_t *fs, svm_fifo_t **f,
			       u32 slice_index);
uword fifo_segment_fifo_offset (svm_fifo_t *f);

/**
 * Allocate message queue on segment
 *
 * @param fs		fifo segment for mq
 * @param mq_index	index in private mqs vector to use to attach
 * @param cfg		configuration for mq
 * @return		attached message queue
 */
svm_msg_q_t *fifo_segment_msg_q_alloc (fifo_segment_t *fs, u32 mq_index,
				       svm_msg_q_cfg_t *cfg);

/**
 *  Attach message queue at fifo segment offset
 *
 *  @param fs		fifo segment for mq
 *  @param offset	offset for shared mq on the segment
 *  @param mq_index	index in private mqs vector to use to attach
 *  @return		attached message queue
 */
svm_msg_q_t *fifo_segment_msg_q_attach (fifo_segment_t *fs, uword offset,
					u32 mq_index);

/**
 * Message queue offset on segment
 *
 * @param fs		fifo segment for mq
 * @param mq_index	index of mq in private mqs vector
 * @return		offset of the shared mq the private mq is attached to
 */
uword fifo_segment_msg_q_offset (fifo_segment_t *fs, u32 mq_index);

/**
 * Try to preallocate fifo headers
 *
 * Tries to preallocate fifo headers and adds them to freelist.
 *
 * @param fs		fifo segment
 * @param batch_size	number of chunks to be allocated
 * @return		0 on success, negative number otherwise
 */
int fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
				     u32 batch_size);

/**
 * Try to preallocate fifo chunks on segment
 *
 * Tries to preallocate chunks of requested size on segment and adds them
 * to chunk freelist.
 *
 * @param fs		fifo segment
 * @param chunk_size	size of chunks to be allocated in bytes
 * @param batch_size	number of chunks to be allocated
 * @return		0 on success, negative number otherwise
 */
int fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
				       u32 chunk_size, u32 batch_size);
/**
 * Pre-allocates fifo pairs in fifo segment
 *
 * The number of fifos pre-allocated is the minimum of the requested number
 * of pairs and the maximum number that fit within the segment. If the maximum
 * is hit, the number of fifo pairs requested is updated by subtracting the
 * number of fifos that have been successfully allocated.
 *
 * @param fs		fifo segment for fifo
 * @param rx_fifo_size	data size of rx fifos
 * @param tx_fifo_size	data size of tx fifos
 * @param n_fifo_pairs	number of pairs requested. Prior to returning, this
 * 			is decremented by the the number of pairs allocated.
 */
void fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
					  u32 rx_fifo_size,
					  u32 tx_fifo_size,
					  u32 * n_fifo_pairs);

/**
 * Allocate chunks in fifo segment
 *
 * @param fsh		fifo segment header
 * @param slice_index	slice where chunks should be alocated
 * @param chunk_size	chunk size needed
 * @return		chunk (or chunks) that cover at least chunk_size bytes
 * 			on success, 0 on failure.
 */
svm_fifo_chunk_t *fsh_alloc_chunk (fifo_segment_header_t * fsh,
				   u32 slice_index, u32 chunk_size);

/**
 * Return chunks to fifo segment
 *
 * @param fsh		fifo segment header
 * @param slice_index	slice where chunks should be returned
 * @param c		pointer to first chunk in 0 terminated linked list
 */
void fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
			 svm_fifo_chunk_t * c);

/**
 * Fifo segment has reached mem limit
 *
 * @param fsh           fifo segment header
 * @return              1 (if reached) or 0 (otherwise)
 */
u8 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh);

/**
 * Fifo segment reset mem limit flag
 *
 * @param fs            fifo segment
 */
void fsh_reset_mem_limit (fifo_segment_header_t * fsh);

/**
 * Fifo segment reset mem limit flag
 *
 * @param fs            fifo segment
 * @param size		size requested
 * @return		pointer to memory allocated or 0
 */
void *fifo_segment_alloc (fifo_segment_t *fs, uword size);
/**
 * Fifo segment allocated size
 *
 * Returns fifo segment's allocated size
 *
 * @param fs            fifo segment
 * @return              allocated size in bytes
 */
uword fifo_segment_size (fifo_segment_t * fs);

/**
 * Fifo segment estimate of number of free bytes
 *
 * Returns fifo segment's internal estimate of the number of free bytes.
 * To force a synchronization between the segment and the underlying
 * memory allocator, call @ref fifo_segment_update_free_bytes
 *
 * @param fs		fifo segment
 * @return		free bytes estimate
 */
uword fifo_segment_free_bytes (fifo_segment_t * fs);

/**
 * Fifo segment number of cached bytes
 *
 * Returns fifo segment's number of cached bytes.
 *
 * @param fs            fifo segment
 * @return              cached bytes
 */
uword fifo_segment_cached_bytes (fifo_segment_t * fs);

uword fifo_segment_available_bytes (fifo_segment_t * fs);

/**
 * Number of bytes on chunk free lists
 *
 * @param fs		fifo segment
 * @return		free bytes on chunk free lists
 */
uword fifo_segment_fl_chunk_bytes (fifo_segment_t * fs);
u8 fifo_segment_has_fifos (fifo_segment_t * fs);
svm_fifo_t *fifo_segment_get_slice_fifo_list (fifo_segment_t * fs,
					      u32 slice_index);
u32 fifo_segment_num_fifos (fifo_segment_t * fs);
u32 fifo_segment_num_free_fifos (fifo_segment_t * fs);
/**
 * Find number of free chunks of given size
 *
 * @param fs	fifo segment
 * @param size	chunk size of interest or ~0 if all should be counted
 * @return	number of chunks of given size
 */
u32 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size);

u8 fifo_segment_get_mem_usage (fifo_segment_t * fs);
fifo_segment_mem_status_t fifo_segment_determine_status
  (fifo_segment_header_t * fsh, u8 usage);
fifo_segment_mem_status_t fifo_segment_get_mem_status (fifo_segment_t * fs);

void fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
			     u32 timeout_in_seconds);

format_function_t format_fifo_segment;
format_function_t format_fifo_segment_type;

#endif /* __included_fifo_segment_h__ */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */