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1 : : /* SPDX-License-Identifier: BSD-3-Clause
2 : : *
3 : : * Copyright (c) 2020 Arm Limited
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_PEEK_ZC_H_
11 : : #define _RTE_RING_PEEK_ZC_H_
12 : :
13 : : /**
14 : : * @file
15 : : * It is not recommended to include this file directly.
16 : : * Please include <rte_ring_elem.h> instead.
17 : : *
18 : : * Ring Peek Zero Copy APIs
19 : : * These APIs make it possible to split public enqueue/dequeue API
20 : : * into 3 parts:
21 : : * - enqueue/dequeue start
22 : : * - copy data to/from the ring
23 : : * - enqueue/dequeue finish
24 : : * Along with the advantages of the peek APIs, these APIs provide the ability
25 : : * to avoid copying of the data to temporary area (for ex: array of mbufs
26 : : * on the stack).
27 : : *
28 : : * Note that currently these APIs are available only for two sync modes:
29 : : * 1) Single Producer/Single Consumer (RTE_RING_SYNC_ST)
30 : : * 2) Serialized Producer/Serialized Consumer (RTE_RING_SYNC_MT_HTS).
31 : : * It is user's responsibility to create/init ring with appropriate sync
32 : : * modes selected.
33 : : *
34 : : * Following are some examples showing the API usage.
35 : : * 1)
36 : : * struct elem_obj {uint64_t a; uint32_t b, c;};
37 : : * struct elem_obj *obj;
38 : : *
39 : : * // Create ring with sync type RTE_RING_SYNC_ST or RTE_RING_SYNC_MT_HTS
40 : : * // Reserve space on the ring
41 : : * n = rte_ring_enqueue_zc_bulk_elem_start(r, sizeof(elem_obj), 1, &zcd, NULL);
42 : : *
43 : : * // Produce the data directly on the ring memory
44 : : * obj = (struct elem_obj *)zcd->ptr1;
45 : : * obj->a = rte_get_a();
46 : : * obj->b = rte_get_b();
47 : : * obj->c = rte_get_c();
48 : : * rte_ring_enqueue_zc_elem_finish(ring, n);
49 : : *
50 : : * 2)
51 : : * // Create ring with sync type RTE_RING_SYNC_ST or RTE_RING_SYNC_MT_HTS
52 : : * // Reserve space on the ring
53 : : * n = rte_ring_enqueue_zc_burst_start(r, 32, &zcd, NULL);
54 : : *
55 : : * // Pkt I/O core polls packets from the NIC
56 : : * if (n != 0) {
57 : : * nb_rx = rte_eth_rx_burst(portid, queueid, zcd->ptr1, zcd->n1);
58 : : * if (nb_rx == zcd->n1 && n != zcd->n1)
59 : : * nb_rx = rte_eth_rx_burst(portid, queueid,
60 : : * zcd->ptr2, n - zcd->n1);
61 : : *
62 : : * // Provide packets to the packet processing cores
63 : : * rte_ring_enqueue_zc_finish(r, nb_rx);
64 : : * }
65 : : *
66 : : * Note that between _start_ and _finish_ none other thread can proceed
67 : : * with enqueue/dequeue operation till _finish_ completes.
68 : : */
69 : :
70 : : #include <rte_ring_peek_elem_pvt.h>
71 : :
72 : : #ifdef __cplusplus
73 : : extern "C" {
74 : : #endif
75 : :
76 : : /**
77 : : * Ring zero-copy information structure.
78 : : *
79 : : * This structure contains the pointers and length of the space
80 : : * reserved on the ring storage.
81 : : */
82 : : struct __rte_cache_aligned rte_ring_zc_data {
83 : : /* Pointer to the first space in the ring */
84 : : void *ptr1;
85 : : /* Pointer to the second space in the ring if there is wrap-around.
86 : : * It contains valid value only if wrap-around happens.
87 : : */
88 : : void *ptr2;
89 : : /* Number of elements in the first pointer. If this is equal to
90 : : * the number of elements requested, then ptr2 is NULL.
91 : : * Otherwise, subtracting n1 from number of elements requested
92 : : * will give the number of elements available at ptr2.
93 : : */
94 : : unsigned int n1;
95 : : };
96 : :
97 : : static __rte_always_inline void
98 : : __rte_ring_get_elem_addr(struct rte_ring *r, uint32_t head,
99 : : uint32_t esize, uint32_t num, void **dst1, uint32_t *n1, void **dst2)
100 : : {
101 : : uint32_t idx, scale, nr_idx;
102 : 11060 : uint32_t *ring = (uint32_t *)&r[1];
103 : :
104 : : /* Normalize to uint32_t */
105 : 8848 : scale = esize / sizeof(uint32_t);
106 : 11060 : idx = head & r->mask;
107 : 11060 : nr_idx = idx * scale;
108 : :
109 [ # # ]: 11060 : *dst1 = ring + nr_idx;
110 : 11060 : *n1 = num;
111 : :
112 [ + + + + : 11060 : if (idx + num > r->size) {
+ + + + +
+ + + + +
+ + - - -
- - - - -
- - - - #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
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# # # # #
# # # # #
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# ]
113 : 0 : *n1 = r->size - idx;
114 : 448 : *dst2 = ring;
115 : : } else {
116 : 10612 : *dst2 = NULL;
117 : : }
118 : : }
119 : :
120 : : /**
121 : : * @internal This function moves prod head value.
122 : : */
123 : : static __rte_always_inline unsigned int
124 : : __rte_ring_do_enqueue_zc_elem_start(struct rte_ring *r, unsigned int esize,
125 : : uint32_t n, enum rte_ring_queue_behavior behavior,
126 : : struct rte_ring_zc_data *zcd, unsigned int *free_space)
127 : : {
128 : : uint32_t free, head, next;
129 : :
130 [ + + - + : 5540 : switch (r->prod.sync_type) {
+ - + + -
+ + - - -
- - - - -
- - # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # ]
131 : : case RTE_RING_SYNC_ST:
132 : : n = __rte_ring_move_prod_head(r, RTE_RING_SYNC_ST, n,
133 : : behavior, &head, &next, &free);
134 : : break;
135 : : case RTE_RING_SYNC_MT_HTS:
136 : : n = __rte_ring_hts_move_prod_head(r, n, behavior, &head, &free);
137 : 2770 : break;
138 : : case RTE_RING_SYNC_MT:
139 : : case RTE_RING_SYNC_MT_RTS:
140 : : default:
141 : : /* unsupported mode, shouldn't be here */
142 : : RTE_ASSERT(0);
143 : : n = 0;
144 : : free = 0;
145 : : return n;
146 : : }
147 : :
148 : : __rte_ring_get_elem_addr(r, head, esize, n, &zcd->ptr1,
149 : : &zcd->n1, &zcd->ptr2);
150 : :
151 [ - + - + : 5540 : if (free_space != NULL)
- + - + ]
152 : 0 : *free_space = free - n;
153 : : return n;
154 : : }
155 : :
156 : : /**
157 : : * Start to enqueue several objects on the ring.
158 : : * Note that no actual objects are put in the queue by this function,
159 : : * it just reserves space for the user on the ring.
160 : : * User has to copy objects into the queue using the returned pointers.
161 : : * User should call rte_ring_enqueue_zc_elem_finish to complete the
162 : : * enqueue operation.
163 : : *
164 : : * @param r
165 : : * A pointer to the ring structure.
166 : : * @param esize
167 : : * The size of ring element, in bytes. It must be a multiple of 4.
168 : : * @param n
169 : : * The number of objects to add in the ring.
170 : : * @param zcd
171 : : * Structure containing the pointers and length of the space
172 : : * reserved on the ring storage.
173 : : * @param free_space
174 : : * If non-NULL, returns the amount of space in the ring after the
175 : : * reservation operation has finished.
176 : : * @return
177 : : * The number of objects that can be enqueued, either 0 or n
178 : : */
179 : : static __rte_always_inline unsigned int
180 : : rte_ring_enqueue_zc_bulk_elem_start(struct rte_ring *r, unsigned int esize,
181 : : unsigned int n, struct rte_ring_zc_data *zcd, unsigned int *free_space)
182 : : {
183 : : return __rte_ring_do_enqueue_zc_elem_start(r, esize, n,
184 : : RTE_RING_QUEUE_FIXED, zcd, free_space);
185 : : }
186 : :
187 : : /**
188 : : * Start to enqueue several pointers to objects on the ring.
189 : : * Note that no actual pointers are put in the queue by this function,
190 : : * it just reserves space for the user on the ring.
191 : : * User has to copy pointers to objects into the queue using the
192 : : * returned pointers.
193 : : * User should call rte_ring_enqueue_zc_finish to complete the
194 : : * enqueue operation.
195 : : *
196 : : * @param r
197 : : * A pointer to the ring structure.
198 : : * @param n
199 : : * The number of objects to add in the ring.
200 : : * @param zcd
201 : : * Structure containing the pointers and length of the space
202 : : * reserved on the ring storage.
203 : : * @param free_space
204 : : * If non-NULL, returns the amount of space in the ring after the
205 : : * reservation operation has finished.
206 : : * @return
207 : : * The number of objects that can be enqueued, either 0 or n
208 : : */
209 : : static __rte_always_inline unsigned int
210 : : rte_ring_enqueue_zc_bulk_start(struct rte_ring *r, unsigned int n,
211 : : struct rte_ring_zc_data *zcd, unsigned int *free_space)
212 : : {
213 : : return rte_ring_enqueue_zc_bulk_elem_start(r, sizeof(uintptr_t), n,
214 : : zcd, free_space);
215 : : }
216 : :
217 : : /**
218 : : * Start to enqueue several objects on the ring.
219 : : * Note that no actual objects are put in the queue by this function,
220 : : * it just reserves space for the user on the ring.
221 : : * User has to copy objects into the queue using the returned pointers.
222 : : * User should call rte_ring_enqueue_zc_elem_finish to complete the
223 : : * enqueue operation.
224 : : *
225 : : * @param r
226 : : * A pointer to the ring structure.
227 : : * @param esize
228 : : * The size of ring element, in bytes. It must be a multiple of 4.
229 : : * @param n
230 : : * The number of objects to add in the ring.
231 : : * @param zcd
232 : : * Structure containing the pointers and length of the space
233 : : * reserved on the ring storage.
234 : : * @param free_space
235 : : * If non-NULL, returns the amount of space in the ring after the
236 : : * reservation operation has finished.
237 : : * @return
238 : : * The number of objects that can be enqueued, either 0 or n
239 : : */
240 : : static __rte_always_inline unsigned int
241 : : rte_ring_enqueue_zc_burst_elem_start(struct rte_ring *r, unsigned int esize,
242 : : unsigned int n, struct rte_ring_zc_data *zcd, unsigned int *free_space)
243 : : {
244 : : return __rte_ring_do_enqueue_zc_elem_start(r, esize, n,
245 : : RTE_RING_QUEUE_VARIABLE, zcd, free_space);
246 : : }
247 : :
248 : : /**
249 : : * Start to enqueue several pointers to objects on the ring.
250 : : * Note that no actual pointers are put in the queue by this function,
251 : : * it just reserves space for the user on the ring.
252 : : * User has to copy pointers to objects into the queue using the
253 : : * returned pointers.
254 : : * User should call rte_ring_enqueue_zc_finish to complete the
255 : : * enqueue operation.
256 : : *
257 : : * @param r
258 : : * A pointer to the ring structure.
259 : : * @param n
260 : : * The number of objects to add in the ring.
261 : : * @param zcd
262 : : * Structure containing the pointers and length of the space
263 : : * reserved on the ring storage.
264 : : * @param free_space
265 : : * If non-NULL, returns the amount of space in the ring after the
266 : : * reservation operation has finished.
267 : : * @return
268 : : * The number of objects that can be enqueued, either 0 or n.
269 : : */
270 : : static __rte_always_inline unsigned int
271 : : rte_ring_enqueue_zc_burst_start(struct rte_ring *r, unsigned int n,
272 : : struct rte_ring_zc_data *zcd, unsigned int *free_space)
273 : : {
274 : : return rte_ring_enqueue_zc_burst_elem_start(r, sizeof(uintptr_t), n,
275 : : zcd, free_space);
276 : : }
277 : :
278 : : /**
279 : : * Complete enqueuing several objects on the ring.
280 : : * Note that number of objects to enqueue should not exceed previous
281 : : * enqueue_start return value.
282 : : *
283 : : * @param r
284 : : * A pointer to the ring structure.
285 : : * @param n
286 : : * The number of objects to add to the ring.
287 : : */
288 : : static __rte_always_inline void
289 : : rte_ring_enqueue_zc_elem_finish(struct rte_ring *r, unsigned int n)
290 : : {
291 : : uint32_t tail;
292 : :
293 [ + + - + : 5520 : switch (r->prod.sync_type) {
+ - + + -
+ + - - -
- - - - -
- - # # #
# # # # #
# # # # ]
294 [ - + - + : 2760 : case RTE_RING_SYNC_ST:
- + - + -
- - - - -
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # ]
295 : : n = __rte_ring_st_get_tail(&r->prod, &tail, n);
296 : : __rte_ring_st_set_head_tail(&r->prod, tail, n, 1);
297 : : break;
298 [ - + - + : 2760 : case RTE_RING_SYNC_MT_HTS:
- + - + -
- - - - -
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # ]
299 : : n = __rte_ring_hts_get_tail(&r->hts_prod, &tail, n);
300 : : __rte_ring_hts_set_head_tail(&r->hts_prod, tail, n, 1);
301 : : break;
302 [ # # # # : 0 : case RTE_RING_SYNC_MT:
# ]
303 : : case RTE_RING_SYNC_MT_RTS:
304 : : default:
305 : : /* unsupported mode, shouldn't be here */
306 : : RTE_ASSERT(0);
307 : : }
308 : : }
309 : :
310 : : /**
311 : : * Complete enqueuing several pointers to objects on the ring.
312 : : * Note that number of objects to enqueue should not exceed previous
313 : : * enqueue_start return value.
314 : : *
315 : : * @param r
316 : : * A pointer to the ring structure.
317 : : * @param n
318 : : * The number of pointers to objects to add to the ring.
319 : : */
320 : : static __rte_always_inline void
321 : : rte_ring_enqueue_zc_finish(struct rte_ring *r, unsigned int n)
322 : : {
323 : : rte_ring_enqueue_zc_elem_finish(r, n);
324 : : }
325 : :
326 : : /**
327 : : * @internal This function moves cons head value and copies up to *n*
328 : : * objects from the ring to the user provided obj_table.
329 : : */
330 : : static __rte_always_inline unsigned int
331 : : __rte_ring_do_dequeue_zc_elem_start(struct rte_ring *r,
332 : : uint32_t esize, uint32_t n, enum rte_ring_queue_behavior behavior,
333 : : struct rte_ring_zc_data *zcd, unsigned int *available)
334 : : {
335 : : uint32_t avail, head, next;
336 : :
337 [ + + - + : 5520 : switch (r->cons.sync_type) {
+ - + + -
+ + - - -
- - - - -
- - # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
338 : : case RTE_RING_SYNC_ST:
339 : : n = __rte_ring_move_cons_head(r, RTE_RING_SYNC_ST, n,
340 : : behavior, &head, &next, &avail);
341 : : break;
342 : : case RTE_RING_SYNC_MT_HTS:
343 : : n = __rte_ring_hts_move_cons_head(r, n, behavior,
344 : : &head, &avail);
345 : 2760 : break;
346 : : case RTE_RING_SYNC_MT:
347 : : case RTE_RING_SYNC_MT_RTS:
348 : : default:
349 : : /* unsupported mode, shouldn't be here */
350 : : RTE_ASSERT(0);
351 : : n = 0;
352 : : avail = 0;
353 : : return n;
354 : : }
355 : :
356 : : __rte_ring_get_elem_addr(r, head, esize, n, &zcd->ptr1,
357 : : &zcd->n1, &zcd->ptr2);
358 : :
359 [ - + - + : 5520 : if (available != NULL)
- + - + ]
360 : 0 : *available = avail - n;
361 : : return n;
362 : : }
363 : :
364 : : /**
365 : : * Start to dequeue several objects from the ring.
366 : : * Note that no actual objects are copied from the queue by this function.
367 : : * User has to copy objects from the queue using the returned pointers.
368 : : * User should call rte_ring_dequeue_zc_elem_finish to complete the
369 : : * dequeue operation.
370 : : *
371 : : * @param r
372 : : * A pointer to the ring structure.
373 : : * @param esize
374 : : * The size of ring element, in bytes. It must be a multiple of 4.
375 : : * @param n
376 : : * The number of objects to remove from the ring.
377 : : * @param zcd
378 : : * Structure containing the pointers and length of the space
379 : : * reserved on the ring storage.
380 : : * @param available
381 : : * If non-NULL, returns the number of remaining ring entries after the
382 : : * dequeue has finished.
383 : : * @return
384 : : * The number of objects that can be dequeued, either 0 or n.
385 : : */
386 : : static __rte_always_inline unsigned int
387 : : rte_ring_dequeue_zc_bulk_elem_start(struct rte_ring *r, unsigned int esize,
388 : : unsigned int n, struct rte_ring_zc_data *zcd, unsigned int *available)
389 : : {
390 : : return __rte_ring_do_dequeue_zc_elem_start(r, esize, n,
391 : : RTE_RING_QUEUE_FIXED, zcd, available);
392 : : }
393 : :
394 : : /**
395 : : * Start to dequeue several pointers to objects from the ring.
396 : : * Note that no actual pointers are removed from the queue by this function.
397 : : * User has to copy pointers to objects from the queue using the
398 : : * returned pointers.
399 : : * User should call rte_ring_dequeue_zc_finish to complete the
400 : : * dequeue operation.
401 : : *
402 : : * @param r
403 : : * A pointer to the ring structure.
404 : : * @param n
405 : : * The number of objects to remove from the ring.
406 : : * @param zcd
407 : : * Structure containing the pointers and length of the space
408 : : * reserved on the ring storage.
409 : : * @param available
410 : : * If non-NULL, returns the number of remaining ring entries after the
411 : : * dequeue has finished.
412 : : * @return
413 : : * The number of objects that can be dequeued, either 0 or n.
414 : : */
415 : : static __rte_always_inline unsigned int
416 : : rte_ring_dequeue_zc_bulk_start(struct rte_ring *r, unsigned int n,
417 : : struct rte_ring_zc_data *zcd, unsigned int *available)
418 : : {
419 : : return rte_ring_dequeue_zc_bulk_elem_start(r, sizeof(uintptr_t),
420 : : n, zcd, available);
421 : : }
422 : :
423 : : /**
424 : : * Start to dequeue several objects from the ring.
425 : : * Note that no actual objects are copied from the queue by this function.
426 : : * User has to copy objects from the queue using the returned pointers.
427 : : * User should call rte_ring_dequeue_zc_elem_finish to complete the
428 : : * dequeue operation.
429 : : *
430 : : * @param r
431 : : * A pointer to the ring structure.
432 : : * @param esize
433 : : * The size of ring element, in bytes. It must be a multiple of 4.
434 : : * This must be the same value used while creating the ring. Otherwise
435 : : * the results are undefined.
436 : : * @param n
437 : : * The number of objects to dequeue from the ring.
438 : : * @param zcd
439 : : * Structure containing the pointers and length of the space
440 : : * reserved on the ring storage.
441 : : * @param available
442 : : * If non-NULL, returns the number of remaining ring entries after the
443 : : * dequeue has finished.
444 : : * @return
445 : : * The number of objects that can be dequeued, either 0 or n.
446 : : */
447 : : static __rte_always_inline unsigned int
448 : : rte_ring_dequeue_zc_burst_elem_start(struct rte_ring *r, unsigned int esize,
449 : : unsigned int n, struct rte_ring_zc_data *zcd, unsigned int *available)
450 : : {
451 : : return __rte_ring_do_dequeue_zc_elem_start(r, esize, n,
452 : : RTE_RING_QUEUE_VARIABLE, zcd, available);
453 : : }
454 : :
455 : : /**
456 : : * Start to dequeue several pointers to objects from the ring.
457 : : * Note that no actual pointers are removed from the queue by this function.
458 : : * User has to copy pointers to objects from the queue using the
459 : : * returned pointers.
460 : : * User should call rte_ring_dequeue_zc_finish to complete the
461 : : * dequeue operation.
462 : : *
463 : : * @param r
464 : : * A pointer to the ring structure.
465 : : * @param n
466 : : * The number of objects to remove from the ring.
467 : : * @param zcd
468 : : * Structure containing the pointers and length of the space
469 : : * reserved on the ring storage.
470 : : * @param available
471 : : * If non-NULL, returns the number of remaining ring entries after the
472 : : * dequeue has finished.
473 : : * @return
474 : : * The number of objects that can be dequeued, either 0 or n.
475 : : */
476 : : static __rte_always_inline unsigned int
477 : : rte_ring_dequeue_zc_burst_start(struct rte_ring *r, unsigned int n,
478 : : struct rte_ring_zc_data *zcd, unsigned int *available)
479 : : {
480 : : return rte_ring_dequeue_zc_burst_elem_start(r, sizeof(uintptr_t), n,
481 : : zcd, available);
482 : : }
483 : :
484 : : /**
485 : : * Complete dequeuing several objects from the ring.
486 : : * Note that number of objects to dequeued should not exceed previous
487 : : * dequeue_start return value.
488 : : *
489 : : * @param r
490 : : * A pointer to the ring structure.
491 : : * @param n
492 : : * The number of objects to remove from the ring.
493 : : */
494 : : static __rte_always_inline void
495 : : rte_ring_dequeue_zc_elem_finish(struct rte_ring *r, unsigned int n)
496 : : {
497 : : uint32_t tail;
498 : :
499 [ # # # # : 0 : switch (r->cons.sync_type) {
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
500 [ # # # # : 0 : case RTE_RING_SYNC_ST:
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
501 : : n = __rte_ring_st_get_tail(&r->cons, &tail, n);
502 : : __rte_ring_st_set_head_tail(&r->cons, tail, n, 0);
503 : : break;
504 [ # # # # : 0 : case RTE_RING_SYNC_MT_HTS:
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
505 : : n = __rte_ring_hts_get_tail(&r->hts_cons, &tail, n);
506 : : __rte_ring_hts_set_head_tail(&r->hts_cons, tail, n, 0);
507 : : break;
508 [ # # # # : 0 : case RTE_RING_SYNC_MT:
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
509 : : case RTE_RING_SYNC_MT_RTS:
510 : : default:
511 : : /* unsupported mode, shouldn't be here */
512 : : RTE_ASSERT(0);
513 : : }
514 : : }
515 : :
516 : : /**
517 : : * Complete dequeuing several objects from the ring.
518 : : * Note that number of objects to dequeued should not exceed previous
519 : : * dequeue_start return value.
520 : : *
521 : : * @param r
522 : : * A pointer to the ring structure.
523 : : * @param n
524 : : * The number of objects to remove from the ring.
525 : : */
526 : : static __rte_always_inline void
527 : : rte_ring_dequeue_zc_finish(struct rte_ring *r, unsigned int n)
528 : : {
529 : : rte_ring_dequeue_elem_finish(r, n);
530 : : }
531 : :
532 : : #ifdef __cplusplus
533 : : }
534 : : #endif
535 : :
536 : : #endif /* _RTE_RING_PEEK_ZC_H_ */
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