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1 : : /* SPDX-License-Identifier: BSD-3-Clause
2 : : *
3 : : * Copyright (c) 2010-2020 Intel Corporation
4 : : * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org
5 : : * All rights reserved.
6 : : * Derived from FreeBSD's bufring.h
7 : : * Used as BSD-3 Licensed with permission from Kip Macy.
8 : : */
9 : :
10 : : #ifndef _RTE_RING_H_
11 : : #define _RTE_RING_H_
12 : :
13 : : /**
14 : : * @file
15 : : * RTE Ring
16 : : *
17 : : * The Ring Manager is a fixed-size queue, implemented as a table of
18 : : * pointers. Head and tail pointers are modified atomically, allowing
19 : : * concurrent access to it. It has the following features:
20 : : *
21 : : * - FIFO (First In First Out)
22 : : * - Maximum size is fixed; the pointers are stored in a table.
23 : : * - Lockless implementation.
24 : : * - Multi- or single-consumer dequeue.
25 : : * - Multi- or single-producer enqueue.
26 : : * - Bulk dequeue.
27 : : * - Bulk enqueue.
28 : : * - Ability to select different sync modes for producer/consumer.
29 : : * - Dequeue start/finish (depending on consumer sync modes).
30 : : * - Enqueue start/finish (depending on producer sync mode).
31 : : *
32 : : * Note: the ring implementation is not preemptible. Refer to Programmer's
33 : : * guide/Environment Abstraction Layer/Multiple pthread/Known Issues/rte_ring
34 : : * for more information.
35 : : */
36 : :
37 : : #include <rte_ring_core.h>
38 : : #include <rte_ring_elem.h>
39 : :
40 : : #ifdef __cplusplus
41 : : extern "C" {
42 : : #endif
43 : :
44 : : /**
45 : : * Calculate the memory size needed for a ring
46 : : *
47 : : * This function returns the number of bytes needed for a ring, given
48 : : * the number of elements in it. This value is the sum of the size of
49 : : * the structure rte_ring and the size of the memory needed by the
50 : : * objects pointers. The value is aligned to a cache line size.
51 : : *
52 : : * @param count
53 : : * The number of elements in the ring (must be a power of 2).
54 : : * @return
55 : : * - The memory size needed for the ring on success.
56 : : * - -EINVAL if count is not a power of 2.
57 : : */
58 : : ssize_t rte_ring_get_memsize(unsigned int count);
59 : :
60 : : /**
61 : : * Initialize a ring structure.
62 : : *
63 : : * Initialize a ring structure in memory pointed by "r". The size of the
64 : : * memory area must be large enough to store the ring structure and the
65 : : * object table. It is advised to use rte_ring_get_memsize() to get the
66 : : * appropriate size.
67 : : *
68 : : * The ring size is set to *count*, which must be a power of two.
69 : : * The real usable ring size is *count-1* instead of *count* to
70 : : * differentiate a full ring from an empty ring.
71 : : *
72 : : * The ring is not added in RTE_TAILQ_RING global list. Indeed, the
73 : : * memory given by the caller may not be shareable among dpdk
74 : : * processes.
75 : : *
76 : : * @param r
77 : : * The pointer to the ring structure followed by the objects table.
78 : : * @param name
79 : : * The name of the ring.
80 : : * @param count
81 : : * The number of elements in the ring (must be a power of 2,
82 : : * unless RING_F_EXACT_SZ is set in flags).
83 : : * @param flags
84 : : * An OR of the following:
85 : : * - One of mutually exclusive flags that define producer behavior:
86 : : * - RING_F_SP_ENQ: If this flag is set, the default behavior when
87 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
88 : : * is "single-producer".
89 : : * - RING_F_MP_RTS_ENQ: If this flag is set, the default behavior when
90 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
91 : : * is "multi-producer RTS mode".
92 : : * - RING_F_MP_HTS_ENQ: If this flag is set, the default behavior when
93 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
94 : : * is "multi-producer HTS mode".
95 : : * If none of these flags is set, then default "multi-producer"
96 : : * behavior is selected.
97 : : * - One of mutually exclusive flags that define consumer behavior:
98 : : * - RING_F_SC_DEQ: If this flag is set, the default behavior when
99 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
100 : : * is "single-consumer". Otherwise, it is "multi-consumers".
101 : : * - RING_F_MC_RTS_DEQ: If this flag is set, the default behavior when
102 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
103 : : * is "multi-consumer RTS mode".
104 : : * - RING_F_MC_HTS_DEQ: If this flag is set, the default behavior when
105 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
106 : : * is "multi-consumer HTS mode".
107 : : * If none of these flags is set, then default "multi-consumer"
108 : : * behavior is selected.
109 : : * - RING_F_EXACT_SZ: If this flag is set, the ring will hold exactly the
110 : : * requested number of entries, and the requested size will be rounded up
111 : : * to the next power of two, but the usable space will be exactly that
112 : : * requested. Worst case, if a power-of-2 size is requested, half the
113 : : * ring space will be wasted.
114 : : * Without this flag set, the ring size requested must be a power of 2,
115 : : * and the usable space will be that size - 1.
116 : : * @return
117 : : * 0 on success, or a negative value on error.
118 : : */
119 : : int rte_ring_init(struct rte_ring *r, const char *name, unsigned int count,
120 : : unsigned int flags);
121 : :
122 : : /**
123 : : * Create a new ring named *name* in memory.
124 : : *
125 : : * This function uses ``memzone_reserve()`` to allocate memory. Then it
126 : : * calls rte_ring_init() to initialize an empty ring.
127 : : *
128 : : * The new ring size is set to *count*, which must be a power of two.
129 : : * The real usable ring size is *count-1* instead of *count* to
130 : : * differentiate a full ring from an empty ring.
131 : : *
132 : : * The ring is added in RTE_TAILQ_RING list.
133 : : *
134 : : * @param name
135 : : * The name of the ring.
136 : : * @param count
137 : : * The size of the ring (must be a power of 2,
138 : : * unless RING_F_EXACT_SZ is set in flags).
139 : : * @param socket_id
140 : : * The *socket_id* argument is the socket identifier in case of
141 : : * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
142 : : * constraint for the reserved zone.
143 : : * @param flags
144 : : * An OR of the following:
145 : : * - One of mutually exclusive flags that define producer behavior:
146 : : * - RING_F_SP_ENQ: If this flag is set, the default behavior when
147 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
148 : : * is "single-producer".
149 : : * - RING_F_MP_RTS_ENQ: If this flag is set, the default behavior when
150 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
151 : : * is "multi-producer RTS mode".
152 : : * - RING_F_MP_HTS_ENQ: If this flag is set, the default behavior when
153 : : * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
154 : : * is "multi-producer HTS mode".
155 : : * If none of these flags is set, then default "multi-producer"
156 : : * behavior is selected.
157 : : * - One of mutually exclusive flags that define consumer behavior:
158 : : * - RING_F_SC_DEQ: If this flag is set, the default behavior when
159 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
160 : : * is "single-consumer". Otherwise, it is "multi-consumers".
161 : : * - RING_F_MC_RTS_DEQ: If this flag is set, the default behavior when
162 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
163 : : * is "multi-consumer RTS mode".
164 : : * - RING_F_MC_HTS_DEQ: If this flag is set, the default behavior when
165 : : * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
166 : : * is "multi-consumer HTS mode".
167 : : * If none of these flags is set, then default "multi-consumer"
168 : : * behavior is selected.
169 : : * - RING_F_EXACT_SZ: If this flag is set, the ring will hold exactly the
170 : : * requested number of entries, and the requested size will be rounded up
171 : : * to the next power of two, but the usable space will be exactly that
172 : : * requested. Worst case, if a power-of-2 size is requested, half the
173 : : * ring space will be wasted.
174 : : * Without this flag set, the ring size requested must be a power of 2,
175 : : * and the usable space will be that size - 1.
176 : : * @return
177 : : * On success, the pointer to the new allocated ring. NULL on error with
178 : : * rte_errno set appropriately. Possible errno values include:
179 : : * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
180 : : * - EINVAL - count provided is not a power of 2
181 : : * - ENOSPC - the maximum number of memzones has already been allocated
182 : : * - EEXIST - a memzone with the same name already exists
183 : : * - ENOMEM - no appropriate memory area found in which to create memzone
184 : : */
185 : : struct rte_ring *rte_ring_create(const char *name, unsigned int count,
186 : : int socket_id, unsigned int flags);
187 : :
188 : : /**
189 : : * De-allocate all memory used by the ring.
190 : : *
191 : : * @param r
192 : : * Ring to free.
193 : : * If NULL then, the function does nothing.
194 : : */
195 : : void rte_ring_free(struct rte_ring *r);
196 : :
197 : : /**
198 : : * Dump the status of the ring to a file.
199 : : *
200 : : * @param f
201 : : * A pointer to a file for output
202 : : * @param r
203 : : * A pointer to the ring structure.
204 : : */
205 : : void rte_ring_dump(FILE *f, const struct rte_ring *r);
206 : :
207 : : /**
208 : : * Enqueue several objects on the ring (multi-producers safe).
209 : : *
210 : : * This function uses a "compare and set" instruction to move the
211 : : * producer index atomically.
212 : : *
213 : : * @param r
214 : : * A pointer to the ring structure.
215 : : * @param obj_table
216 : : * A pointer to a table of void * pointers (objects).
217 : : * @param n
218 : : * The number of objects to add in the ring from the obj_table.
219 : : * @param free_space
220 : : * if non-NULL, returns the amount of space in the ring after the
221 : : * enqueue operation has finished.
222 : : * @return
223 : : * The number of objects enqueued, either 0 or n
224 : : */
225 : : static __rte_always_inline unsigned int
226 : 277 : rte_ring_mp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
227 : : unsigned int n, unsigned int *free_space)
228 : : {
229 : 277 : return rte_ring_mp_enqueue_bulk_elem(r, obj_table, sizeof(void *),
230 : : n, free_space);
231 : : }
232 : :
233 : : /**
234 : : * Enqueue several objects on a ring (NOT multi-producers safe).
235 : : *
236 : : * @param r
237 : : * A pointer to the ring structure.
238 : : * @param obj_table
239 : : * A pointer to a table of void * pointers (objects).
240 : : * @param n
241 : : * The number of objects to add in the ring from the obj_table.
242 : : * @param free_space
243 : : * if non-NULL, returns the amount of space in the ring after the
244 : : * enqueue operation has finished.
245 : : * @return
246 : : * The number of objects enqueued, either 0 or n
247 : : */
248 : : static __rte_always_inline unsigned int
249 : 277 : rte_ring_sp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
250 : : unsigned int n, unsigned int *free_space)
251 : : {
252 : 277 : return rte_ring_sp_enqueue_bulk_elem(r, obj_table, sizeof(void *),
253 : : n, free_space);
254 : : }
255 : :
256 : : /**
257 : : * Enqueue several objects on a ring.
258 : : *
259 : : * This function calls the multi-producer or the single-producer
260 : : * version depending on the default behavior that was specified at
261 : : * ring creation time (see flags).
262 : : *
263 : : * @param r
264 : : * A pointer to the ring structure.
265 : : * @param obj_table
266 : : * A pointer to a table of void * pointers (objects).
267 : : * @param n
268 : : * The number of objects to add in the ring from the obj_table.
269 : : * @param free_space
270 : : * if non-NULL, returns the amount of space in the ring after the
271 : : * enqueue operation has finished.
272 : : * @return
273 : : * The number of objects enqueued, either 0 or n
274 : : */
275 : : static __rte_always_inline unsigned int
276 [ + - + + : 831 : rte_ring_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
- ]
277 : : unsigned int n, unsigned int *free_space)
278 : : {
279 : 831 : return rte_ring_enqueue_bulk_elem(r, obj_table, sizeof(void *),
280 : : n, free_space);
281 : : }
282 : :
283 : : /**
284 : : * Enqueue one object on a ring (multi-producers safe).
285 : : *
286 : : * This function uses a "compare and set" instruction to move the
287 : : * producer index atomically.
288 : : *
289 : : * @param r
290 : : * A pointer to the ring structure.
291 : : * @param obj
292 : : * A pointer to the object to be added.
293 : : * @return
294 : : * - 0: Success; objects enqueued.
295 : : * - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
296 : : */
297 : : static __rte_always_inline int
298 : : rte_ring_mp_enqueue(struct rte_ring *r, void *obj)
299 : : {
300 : : return rte_ring_mp_enqueue_elem(r, &obj, sizeof(void *));
301 : : }
302 : :
303 : : /**
304 : : * Enqueue one object on a ring (NOT multi-producers safe).
305 : : *
306 : : * @param r
307 : : * A pointer to the ring structure.
308 : : * @param obj
309 : : * A pointer to the object to be added.
310 : : * @return
311 : : * - 0: Success; objects enqueued.
312 : : * - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
313 : : */
314 : : static __rte_always_inline int
315 : : rte_ring_sp_enqueue(struct rte_ring *r, void *obj)
316 : : {
317 : : return rte_ring_sp_enqueue_elem(r, &obj, sizeof(void *));
318 : : }
319 : :
320 : : /**
321 : : * Enqueue one object on a ring.
322 : : *
323 : : * This function calls the multi-producer or the single-producer
324 : : * version, depending on the default behaviour that was specified at
325 : : * ring creation time (see flags).
326 : : *
327 : : * @param r
328 : : * A pointer to the ring structure.
329 : : * @param obj
330 : : * A pointer to the object to be added.
331 : : * @return
332 : : * - 0: Success; objects enqueued.
333 : : * - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
334 : : */
335 : : static __rte_always_inline int
336 : : rte_ring_enqueue(struct rte_ring *r, void *obj)
337 : : {
338 : : return rte_ring_enqueue_elem(r, &obj, sizeof(void *));
339 : : }
340 : :
341 : : /**
342 : : * Dequeue several objects from a ring (multi-consumers safe).
343 : : *
344 : : * This function uses a "compare and set" instruction to move the
345 : : * consumer index atomically.
346 : : *
347 : : * @param r
348 : : * A pointer to the ring structure.
349 : : * @param obj_table
350 : : * A pointer to a table of void * pointers (objects) that will be filled.
351 : : * @param n
352 : : * The number of objects to dequeue from the ring to the obj_table.
353 : : * @param available
354 : : * If non-NULL, returns the number of remaining ring entries after the
355 : : * dequeue has finished.
356 : : * @return
357 : : * The number of objects dequeued, either 0 or n
358 : : */
359 : : static __rte_always_inline unsigned int
360 : 276 : rte_ring_mc_dequeue_bulk(struct rte_ring *r, void **obj_table,
361 : : unsigned int n, unsigned int *available)
362 : : {
363 : 276 : return rte_ring_mc_dequeue_bulk_elem(r, obj_table, sizeof(void *),
364 : : n, available);
365 : : }
366 : :
367 : : /**
368 : : * Dequeue several objects from a ring (NOT multi-consumers safe).
369 : : *
370 : : * @param r
371 : : * A pointer to the ring structure.
372 : : * @param obj_table
373 : : * A pointer to a table of void * pointers (objects) that will be filled.
374 : : * @param n
375 : : * The number of objects to dequeue from the ring to the obj_table,
376 : : * must be strictly positive.
377 : : * @param available
378 : : * If non-NULL, returns the number of remaining ring entries after the
379 : : * dequeue has finished.
380 : : * @return
381 : : * The number of objects dequeued, either 0 or n
382 : : */
383 : : static __rte_always_inline unsigned int
384 : 276 : rte_ring_sc_dequeue_bulk(struct rte_ring *r, void **obj_table,
385 : : unsigned int n, unsigned int *available)
386 : : {
387 : 276 : return rte_ring_sc_dequeue_bulk_elem(r, obj_table, sizeof(void *),
388 : : n, available);
389 : : }
390 : :
391 : : /**
392 : : * Dequeue several objects from a ring.
393 : : *
394 : : * This function calls the multi-consumers or the single-consumer
395 : : * version, depending on the default behaviour that was specified at
396 : : * ring creation time (see flags).
397 : : *
398 : : * @param r
399 : : * A pointer to the ring structure.
400 : : * @param obj_table
401 : : * A pointer to a table of void * pointers (objects) that will be filled.
402 : : * @param n
403 : : * The number of objects to dequeue from the ring to the obj_table.
404 : : * @param available
405 : : * If non-NULL, returns the number of remaining ring entries after the
406 : : * dequeue has finished.
407 : : * @return
408 : : * The number of objects dequeued, either 0 or n
409 : : */
410 : : static __rte_always_inline unsigned int
411 [ + - + + : 828 : rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned int n,
- ]
412 : : unsigned int *available)
413 : : {
414 : 828 : return rte_ring_dequeue_bulk_elem(r, obj_table, sizeof(void *),
415 : : n, available);
416 : : }
417 : :
418 : : /**
419 : : * Dequeue one object from a ring (multi-consumers safe).
420 : : *
421 : : * This function uses a "compare and set" instruction to move the
422 : : * consumer index atomically.
423 : : *
424 : : * @param r
425 : : * A pointer to the ring structure.
426 : : * @param obj_p
427 : : * A pointer to a void * pointer (object) that will be filled.
428 : : * @return
429 : : * - 0: Success; objects dequeued.
430 : : * - -ENOENT: Not enough entries in the ring to dequeue; no object is
431 : : * dequeued.
432 : : */
433 : : static __rte_always_inline int
434 : : rte_ring_mc_dequeue(struct rte_ring *r, void **obj_p)
435 : : {
436 : : return rte_ring_mc_dequeue_elem(r, obj_p, sizeof(void *));
437 : : }
438 : :
439 : : /**
440 : : * Dequeue one object from a ring (NOT multi-consumers safe).
441 : : *
442 : : * @param r
443 : : * A pointer to the ring structure.
444 : : * @param obj_p
445 : : * A pointer to a void * pointer (object) that will be filled.
446 : : * @return
447 : : * - 0: Success; objects dequeued.
448 : : * - -ENOENT: Not enough entries in the ring to dequeue, no object is
449 : : * dequeued.
450 : : */
451 : : static __rte_always_inline int
452 : : rte_ring_sc_dequeue(struct rte_ring *r, void **obj_p)
453 : : {
454 : : return rte_ring_sc_dequeue_elem(r, obj_p, sizeof(void *));
455 : : }
456 : :
457 : : /**
458 : : * Dequeue one object from a ring.
459 : : *
460 : : * This function calls the multi-consumers or the single-consumer
461 : : * version depending on the default behaviour that was specified at
462 : : * ring creation time (see flags).
463 : : *
464 : : * @param r
465 : : * A pointer to the ring structure.
466 : : * @param obj_p
467 : : * A pointer to a void * pointer (object) that will be filled.
468 : : * @return
469 : : * - 0: Success, objects dequeued.
470 : : * - -ENOENT: Not enough entries in the ring to dequeue, no object is
471 : : * dequeued.
472 : : */
473 : : static __rte_always_inline int
474 : : rte_ring_dequeue(struct rte_ring *r, void **obj_p)
475 : : {
476 : : return rte_ring_dequeue_elem(r, obj_p, sizeof(void *));
477 : : }
478 : :
479 : : /**
480 : : * Flush a ring.
481 : : *
482 : : * This function flush all the elements in a ring
483 : : *
484 : : * @warning
485 : : * Make sure the ring is not in use while calling this function.
486 : : *
487 : : * @param r
488 : : * A pointer to the ring structure.
489 : : */
490 : : void
491 : : rte_ring_reset(struct rte_ring *r);
492 : :
493 : : /**
494 : : * Return the number of entries in a ring.
495 : : *
496 : : * @param r
497 : : * A pointer to the ring structure.
498 : : * @return
499 : : * The number of entries in the ring.
500 : : */
501 : : static inline unsigned int
502 : 0 : rte_ring_count(const struct rte_ring *r)
503 : : {
504 : 8402495 : uint32_t prod_tail = r->prod.tail;
505 : 8402495 : uint32_t cons_tail = r->cons.tail;
506 [ - + - + ]: 8400174 : uint32_t count = (prod_tail - cons_tail) & r->mask;
507 [ + + - + : 8399990 : return (count > r->capacity) ? r->capacity : count;
+ + + + #
# # # #
# ]
508 : : }
509 : :
510 : : /**
511 : : * Return the number of free entries in a ring.
512 : : *
513 : : * @param r
514 : : * A pointer to the ring structure.
515 : : * @return
516 : : * The number of free entries in the ring.
517 : : */
518 : : static inline unsigned int
519 : : rte_ring_free_count(const struct rte_ring *r)
520 : : {
521 [ - + - + : 8398205 : return r->capacity - rte_ring_count(r);
- + - + ]
522 : : }
523 : :
524 : : /**
525 : : * Test if a ring is full.
526 : : *
527 : : * @param r
528 : : * A pointer to the ring structure.
529 : : * @return
530 : : * - 1: The ring is full.
531 : : * - 0: The ring is not full.
532 : : */
533 : : static inline int
534 : : rte_ring_full(const struct rte_ring *r)
535 : : {
536 [ # # ]: 0 : return rte_ring_free_count(r) == 0;
537 : : }
538 : :
539 : : /**
540 : : * Test if a ring is empty.
541 : : *
542 : : * @param r
543 : : * A pointer to the ring structure.
544 : : * @return
545 : : * - 1: The ring is empty.
546 : : * - 0: The ring is not empty.
547 : : */
548 : : static inline int
549 : : rte_ring_empty(const struct rte_ring *r)
550 : : {
551 : 9276592 : uint32_t prod_tail = r->prod.tail;
552 [ + + - + : 9276592 : uint32_t cons_tail = r->cons.tail;
- + - + -
+ - + ]
553 [ # # ]: 0 : return cons_tail == prod_tail;
554 : : }
555 : :
556 : : /**
557 : : * Return the size of the ring.
558 : : *
559 : : * @param r
560 : : * A pointer to the ring structure.
561 : : * @return
562 : : * The size of the data store used by the ring.
563 : : * NOTE: this is not the same as the usable space in the ring. To query that
564 : : * use ``rte_ring_get_capacity()``.
565 : : */
566 : : static inline unsigned int
567 : : rte_ring_get_size(const struct rte_ring *r)
568 : : {
569 [ + + ]: 6 : return r->size;
570 : : }
571 : :
572 : : /**
573 : : * Return the number of elements which can be stored in the ring.
574 : : *
575 : : * @param r
576 : : * A pointer to the ring structure.
577 : : * @return
578 : : * The usable size of the ring.
579 : : */
580 : : static inline unsigned int
581 : : rte_ring_get_capacity(const struct rte_ring *r)
582 : : {
583 [ + + - + : 1059 : return r->capacity;
- + - + ]
584 : : }
585 : :
586 : : /**
587 : : * Return sync type used by producer in the ring.
588 : : *
589 : : * @param r
590 : : * A pointer to the ring structure.
591 : : * @return
592 : : * Producer sync type value.
593 : : */
594 : : static inline enum rte_ring_sync_type
595 : : rte_ring_get_prod_sync_type(const struct rte_ring *r)
596 : : {
597 [ - - + - ]: 45 : return r->prod.sync_type;
598 : : }
599 : :
600 : : /**
601 : : * Check is the ring for single producer.
602 : : *
603 : : * @param r
604 : : * A pointer to the ring structure.
605 : : * @return
606 : : * true if ring is SP, zero otherwise.
607 : : */
608 : : static inline int
609 : : rte_ring_is_prod_single(const struct rte_ring *r)
610 : : {
611 : : return (rte_ring_get_prod_sync_type(r) == RTE_RING_SYNC_ST);
612 : : }
613 : :
614 : : /**
615 : : * Return sync type used by consumer in the ring.
616 : : *
617 : : * @param r
618 : : * A pointer to the ring structure.
619 : : * @return
620 : : * Consumer sync type value.
621 : : */
622 : : static inline enum rte_ring_sync_type
623 : : rte_ring_get_cons_sync_type(const struct rte_ring *r)
624 : : {
625 [ + - ]: 48 : return r->cons.sync_type;
626 : : }
627 : :
628 : : /**
629 : : * Check is the ring for single consumer.
630 : : *
631 : : * @param r
632 : : * A pointer to the ring structure.
633 : : * @return
634 : : * true if ring is SC, zero otherwise.
635 : : */
636 : : static inline int
637 : : rte_ring_is_cons_single(const struct rte_ring *r)
638 : : {
639 : : return (rte_ring_get_cons_sync_type(r) == RTE_RING_SYNC_ST);
640 : : }
641 : :
642 : : /**
643 : : * Dump the status of all rings on the console
644 : : *
645 : : * @param f
646 : : * A pointer to a file for output
647 : : */
648 : : void rte_ring_list_dump(FILE *f);
649 : :
650 : : /**
651 : : * Search a ring from its name
652 : : *
653 : : * @param name
654 : : * The name of the ring.
655 : : * @return
656 : : * The pointer to the ring matching the name, or NULL if not found,
657 : : * with rte_errno set appropriately. Possible rte_errno values include:
658 : : * - ENOENT - required entry not available to return.
659 : : */
660 : : struct rte_ring *rte_ring_lookup(const char *name);
661 : :
662 : : /**
663 : : * Enqueue several objects on the ring (multi-producers safe).
664 : : *
665 : : * This function uses a "compare and set" instruction to move the
666 : : * producer index atomically.
667 : : *
668 : : * @param r
669 : : * A pointer to the ring structure.
670 : : * @param obj_table
671 : : * A pointer to a table of void * pointers (objects).
672 : : * @param n
673 : : * The number of objects to add in the ring from the obj_table.
674 : : * @param free_space
675 : : * if non-NULL, returns the amount of space in the ring after the
676 : : * enqueue operation has finished.
677 : : * @return
678 : : * - n: Actual number of objects enqueued.
679 : : */
680 : : static __rte_always_inline unsigned int
681 : 277 : rte_ring_mp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
682 : : unsigned int n, unsigned int *free_space)
683 : : {
684 : 277 : return rte_ring_mp_enqueue_burst_elem(r, obj_table, sizeof(void *),
685 : : n, free_space);
686 : : }
687 : :
688 : : /**
689 : : * Enqueue several objects on a ring (NOT multi-producers safe).
690 : : *
691 : : * @param r
692 : : * A pointer to the ring structure.
693 : : * @param obj_table
694 : : * A pointer to a table of void * pointers (objects).
695 : : * @param n
696 : : * The number of objects to add in the ring from the obj_table.
697 : : * @param free_space
698 : : * if non-NULL, returns the amount of space in the ring after the
699 : : * enqueue operation has finished.
700 : : * @return
701 : : * - n: Actual number of objects enqueued.
702 : : */
703 : : static __rte_always_inline unsigned int
704 : 277 : rte_ring_sp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
705 : : unsigned int n, unsigned int *free_space)
706 : : {
707 : 277 : return rte_ring_sp_enqueue_burst_elem(r, obj_table, sizeof(void *),
708 : : n, free_space);
709 : : }
710 : :
711 : : /**
712 : : * Enqueue several objects on a ring.
713 : : *
714 : : * This function calls the multi-producer or the single-producer
715 : : * version depending on the default behavior that was specified at
716 : : * ring creation time (see flags).
717 : : *
718 : : * @param r
719 : : * A pointer to the ring structure.
720 : : * @param obj_table
721 : : * A pointer to a table of void * pointers (objects).
722 : : * @param n
723 : : * The number of objects to add in the ring from the obj_table.
724 : : * @param free_space
725 : : * if non-NULL, returns the amount of space in the ring after the
726 : : * enqueue operation has finished.
727 : : * @return
728 : : * - n: Actual number of objects enqueued.
729 : : */
730 : : static __rte_always_inline unsigned int
731 [ + - + + : 831 : rte_ring_enqueue_burst(struct rte_ring *r, void * const *obj_table,
- ]
732 : : unsigned int n, unsigned int *free_space)
733 : : {
734 : 831 : return rte_ring_enqueue_burst_elem(r, obj_table, sizeof(void *),
735 : : n, free_space);
736 : : }
737 : :
738 : : /**
739 : : * Dequeue several objects from a ring (multi-consumers safe). When the request
740 : : * objects are more than the available objects, only dequeue the actual number
741 : : * of objects
742 : : *
743 : : * This function uses a "compare and set" instruction to move the
744 : : * consumer index atomically.
745 : : *
746 : : * @param r
747 : : * A pointer to the ring structure.
748 : : * @param obj_table
749 : : * A pointer to a table of void * pointers (objects) that will be filled.
750 : : * @param n
751 : : * The number of objects to dequeue from the ring to the obj_table.
752 : : * @param available
753 : : * If non-NULL, returns the number of remaining ring entries after the
754 : : * dequeue has finished.
755 : : * @return
756 : : * - n: Actual number of objects dequeued, 0 if ring is empty
757 : : */
758 : : static __rte_always_inline unsigned int
759 : 276 : rte_ring_mc_dequeue_burst(struct rte_ring *r, void **obj_table,
760 : : unsigned int n, unsigned int *available)
761 : : {
762 : 276 : return rte_ring_mc_dequeue_burst_elem(r, obj_table, sizeof(void *),
763 : : n, available);
764 : : }
765 : :
766 : : /**
767 : : * Dequeue several objects from a ring (NOT multi-consumers safe).When the
768 : : * request objects are more than the available objects, only dequeue the
769 : : * actual number of objects
770 : : *
771 : : * @param r
772 : : * A pointer to the ring structure.
773 : : * @param obj_table
774 : : * A pointer to a table of void * pointers (objects) that will be filled.
775 : : * @param n
776 : : * The number of objects to dequeue from the ring to the obj_table.
777 : : * @param available
778 : : * If non-NULL, returns the number of remaining ring entries after the
779 : : * dequeue has finished.
780 : : * @return
781 : : * - n: Actual number of objects dequeued, 0 if ring is empty
782 : : */
783 : : static __rte_always_inline unsigned int
784 : 276 : rte_ring_sc_dequeue_burst(struct rte_ring *r, void **obj_table,
785 : : unsigned int n, unsigned int *available)
786 : : {
787 : 276 : return rte_ring_sc_dequeue_burst_elem(r, obj_table, sizeof(void *),
788 : : n, available);
789 : : }
790 : :
791 : : /**
792 : : * Dequeue multiple objects from a ring up to a maximum number.
793 : : *
794 : : * This function calls the multi-consumers or the single-consumer
795 : : * version, depending on the default behaviour that was specified at
796 : : * ring creation time (see flags).
797 : : *
798 : : * @param r
799 : : * A pointer to the ring structure.
800 : : * @param obj_table
801 : : * A pointer to a table of void * pointers (objects) that will be filled.
802 : : * @param n
803 : : * The number of objects to dequeue from the ring to the obj_table.
804 : : * @param available
805 : : * If non-NULL, returns the number of remaining ring entries after the
806 : : * dequeue has finished.
807 : : * @return
808 : : * - Number of objects dequeued
809 : : */
810 : : static __rte_always_inline unsigned int
811 [ + - + + : 828 : rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table,
- ]
812 : : unsigned int n, unsigned int *available)
813 : : {
814 : 828 : return rte_ring_dequeue_burst_elem(r, obj_table, sizeof(void *),
815 : : n, available);
816 : : }
817 : :
818 : : #ifdef __cplusplus
819 : : }
820 : : #endif
821 : :
822 : : #endif /* _RTE_RING_H_ */
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