Line data Source code
1 : /*
2 : * Copyright (c) 2016 Cisco and/or its affiliates.
3 : * Licensed under the Apache License, Version 2.0 (the "License");
4 : * you may not use this file except in compliance with the License.
5 : * You may obtain a copy of the License at:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
9 : * Unless required by applicable law or agreed to in writing, software
10 : * distributed under the License is distributed on an "AS IS" BASIS,
11 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 : * See the License for the specific language governing permissions and
13 : * limitations under the License.
14 : */
15 :
16 : /** @file
17 : * @brief TW timer implementation TEMPLATE ONLY, do not compile directly
18 : *
19 : *
20 : */
21 : #if TW_START_STOP_TRACE_SIZE > 0
22 :
23 : void TW (tw_timer_trace) (TWT (tw_timer_wheel) * tw, u32 timer_id,
24 : u32 pool_index, u32 handle)
25 : {
26 : TWT (trace) * t = &tw->traces[tw->trace_index];
27 :
28 : t->timer_id = timer_id;
29 : t->pool_index = pool_index;
30 : t->handle = handle;
31 :
32 : tw->trace_index++;
33 : if (tw->trace_index == TW_START_STOP_TRACE_SIZE)
34 : {
35 : tw->trace_index = 0;
36 : tw->trace_wrapped++;
37 : }
38 : }
39 :
40 : void TW (tw_search_trace) (TWT (tw_timer_wheel) * tw, u32 handle)
41 : {
42 : u32 i, start_pos;
43 : TWT (trace) * t;
44 : char *s = "bogus!";
45 :
46 : /* reverse search for the supplied handle */
47 :
48 : start_pos = tw->trace_index;
49 : if (start_pos == 0)
50 : start_pos = TW_START_STOP_TRACE_SIZE - 1;
51 : else
52 : start_pos--;
53 :
54 : for (i = start_pos; i > 0; i--)
55 : {
56 : t = &tw->traces[i];
57 : if (t->handle == handle)
58 : {
59 : switch (t->timer_id)
60 : {
61 : case 0xFF:
62 : s = "stopped";
63 : break;
64 : case 0xFE:
65 : s = "expired";
66 : break;
67 : default:
68 : s = "started";
69 : break;
70 : }
71 : fformat (stderr, "handle 0x%x (%d) %s at trace %d\n",
72 : handle, handle, s, i);
73 : }
74 : }
75 : if (tw->trace_wrapped > 0)
76 : {
77 : for (i = TW_START_STOP_TRACE_SIZE; i >= tw->trace_index; i--)
78 : {
79 : t = &tw->traces[i];
80 : if (t->handle == handle)
81 : {
82 : switch (t->timer_id)
83 : {
84 : case 0xFF:
85 : s = "stopped";
86 : break;
87 : case 0xFE:
88 : s = "expired";
89 : break;
90 : default:
91 : s = "started";
92 : break;
93 : }
94 : fformat (stderr, "handle 0x%x (%d) %s at trace %d\n",
95 : handle, handle, s, i);
96 : }
97 : }
98 : }
99 : }
100 : #endif /* TW_START_STOP_TRACE_SIZE > 0 */
101 :
102 : static inline u32
103 2271073 : TW (make_internal_timer_handle) (u32 pool_index, u32 timer_id)
104 : {
105 : u32 handle;
106 :
107 2271073 : ASSERT (timer_id < TW_TIMERS_PER_OBJECT);
108 : #if LOG2_TW_TIMERS_PER_OBJECT > 0
109 18113 : ASSERT (pool_index < (1 << (32 - LOG2_TW_TIMERS_PER_OBJECT)));
110 :
111 18113 : handle = (timer_id << (32 - LOG2_TW_TIMERS_PER_OBJECT)) | (pool_index);
112 : #else
113 2252960 : handle = pool_index;
114 : #endif
115 2271073 : return handle;
116 : }
117 :
118 : static inline void
119 2666155 : timer_addhead (TWT (tw_timer) * pool, u32 head_index, u32 new_index)
120 : {
121 2666155 : TWT (tw_timer) * head = pool_elt_at_index (pool, head_index);
122 : TWT (tw_timer) * old_first;
123 : u32 old_first_index;
124 : TWT (tw_timer) * new;
125 :
126 2666155 : new = pool_elt_at_index (pool, new_index);
127 :
128 2666155 : if (PREDICT_FALSE (head->next == head_index))
129 : {
130 2301248 : head->next = head->prev = new_index;
131 2301248 : new->next = new->prev = head_index;
132 2301248 : return;
133 : }
134 :
135 364902 : old_first_index = head->next;
136 364902 : old_first = pool_elt_at_index (pool, old_first_index);
137 :
138 364902 : new->next = old_first_index;
139 364902 : new->prev = old_first->prev;
140 364902 : old_first->prev = new_index;
141 364902 : head->next = new_index;
142 : }
143 :
144 : static inline void
145 499205 : timer_remove (TWT (tw_timer) * pool, TWT (tw_timer) * elt)
146 : {
147 : TWT (tw_timer) * next_elt, *prev_elt;
148 :
149 499205 : ASSERT (elt->user_handle != ~0);
150 :
151 499205 : next_elt = pool_elt_at_index (pool, elt->next);
152 499205 : prev_elt = pool_elt_at_index (pool, elt->prev);
153 :
154 499205 : next_elt->prev = elt->prev;
155 499205 : prev_elt->next = elt->next;
156 :
157 499205 : elt->prev = elt->next = ~0;
158 499205 : }
159 :
160 : static inline void
161 2309927 : timer_add (TWT (tw_timer_wheel) * tw, TWT (tw_timer) * t, u64 interval)
162 : {
163 : #if TW_TIMER_WHEELS > 1
164 : u16 slow_ring_offset;
165 : u32 carry;
166 : #endif
167 : #if TW_TIMER_WHEELS > 2
168 : u16 glacier_ring_offset;
169 : #endif
170 : #if TW_OVERFLOW_VECTOR > 0
171 : u64 interval_plus_time_to_wrap, triple_wrap_mask;
172 : #endif
173 : u16 fast_ring_offset;
174 : tw_timer_wheel_slot_t *ts;
175 :
176 : /* Factor interval into 1..3 wheel offsets */
177 : #if TW_TIMER_WHEELS > 2
178 : #if TW_OVERFLOW_VECTOR > 0
179 : /*
180 : * This is tricky. Put a timer onto the overflow
181 : * vector if the interval PLUS the time
182 : * until the next triple-wrap exceeds one full revolution
183 : * of all three wheels.
184 : */
185 2266580 : triple_wrap_mask = (1 << (3 * TW_RING_SHIFT)) - 1;
186 2266580 : interval_plus_time_to_wrap =
187 2266580 : interval + (tw->current_tick & triple_wrap_mask);
188 2266580 : if ((interval_plus_time_to_wrap >= 1 << (3 * TW_RING_SHIFT)))
189 : {
190 8093 : t->expiration_time = tw->current_tick + interval;
191 8093 : ts = &tw->overflow;
192 8093 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
193 : #if TW_START_STOP_TRACE_SIZE > 0
194 : TW (tw_timer_trace) (tw, timer_id, user_id, t - tw->timers);
195 : #endif
196 8093 : return;
197 : }
198 : #endif
199 :
200 2258480 : glacier_ring_offset = interval >> (2 * TW_RING_SHIFT);
201 2258480 : ASSERT ((u64) glacier_ring_offset < TW_SLOTS_PER_RING);
202 2258480 : interval -= (((u64) glacier_ring_offset) << (2 * TW_RING_SHIFT));
203 : #endif
204 : #if TW_TIMER_WHEELS > 1
205 2301824 : slow_ring_offset = interval >> TW_RING_SHIFT;
206 2301824 : ASSERT ((u64) slow_ring_offset < TW_SLOTS_PER_RING);
207 2301824 : interval -= (((u64) slow_ring_offset) << TW_RING_SHIFT);
208 : #endif
209 2301827 : fast_ring_offset = interval & TW_RING_MASK;
210 :
211 : /*
212 : * Account for the current wheel positions(s)
213 : * This is made slightly complicated by the fact that the current
214 : * index vector will contain (TW_SLOTS_PER_RING, ...) when
215 : * the actual position is (0, ...)
216 : */
217 :
218 2301827 : fast_ring_offset += tw->current_index[TW_TIMER_RING_FAST] & TW_RING_MASK;
219 :
220 : #if TW_TIMER_WHEELS > 1
221 2301824 : carry = fast_ring_offset >= TW_SLOTS_PER_RING ? 1 : 0;
222 2301824 : fast_ring_offset %= TW_SLOTS_PER_RING;
223 2301824 : slow_ring_offset += (tw->current_index[TW_TIMER_RING_SLOW] & TW_RING_MASK)
224 2301824 : + carry;
225 2301824 : carry = slow_ring_offset >= TW_SLOTS_PER_RING ? 1 : 0;
226 2301824 : slow_ring_offset %= TW_SLOTS_PER_RING;
227 : #endif
228 :
229 : #if TW_TIMER_WHEELS > 2
230 2258480 : glacier_ring_offset +=
231 2258480 : (tw->current_index[TW_TIMER_RING_GLACIER] & TW_RING_MASK) + carry;
232 2258480 : glacier_ring_offset %= TW_SLOTS_PER_RING;
233 : #endif
234 :
235 : #if TW_TIMER_WHEELS > 2
236 2258480 : if (glacier_ring_offset !=
237 2258480 : (tw->current_index[TW_TIMER_RING_GLACIER] & TW_RING_MASK))
238 : {
239 : /* We'll need slow and fast ring offsets later */
240 436529 : t->slow_ring_offset = slow_ring_offset;
241 436529 : t->fast_ring_offset = fast_ring_offset;
242 :
243 436529 : ts = &tw->w[TW_TIMER_RING_GLACIER][glacier_ring_offset];
244 :
245 436529 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
246 : #if TW_START_STOP_TRACE_SIZE > 0
247 : TW (tw_timer_trace) (tw, timer_id, user_id, t - tw->timers);
248 : #endif
249 436529 : return;
250 : }
251 : #endif
252 :
253 : #if TW_TIMER_WHEELS > 1
254 : /* Timer expires more than 51.2 seconds from now? */
255 1865294 : if (slow_ring_offset !=
256 1865294 : (tw->current_index[TW_TIMER_RING_SLOW] & TW_RING_MASK))
257 : {
258 : /* We'll need the fast ring offset later... */
259 400398 : t->fast_ring_offset = fast_ring_offset;
260 :
261 400398 : ts = &tw->w[TW_TIMER_RING_SLOW][slow_ring_offset];
262 :
263 400398 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
264 : #if TW_START_STOP_TRACE_SIZE > 0
265 : TW (tw_timer_trace) (tw, timer_id, user_id, t - tw->timers);
266 : #endif
267 400398 : return;
268 : }
269 : #else
270 3 : fast_ring_offset %= TW_SLOTS_PER_RING;
271 : #endif
272 :
273 : /* Timer expires less than one fast-ring revolution from now */
274 1464901 : ts = &tw->w[TW_TIMER_RING_FAST][fast_ring_offset];
275 :
276 1464901 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
277 :
278 : #if TW_FAST_WHEEL_BITMAP
279 1464750 : tw->fast_slot_bitmap = clib_bitmap_set (tw->fast_slot_bitmap,
280 : fast_ring_offset, 1);
281 : #endif
282 : #if TW_START_STOP_TRACE_SIZE > 0
283 : TW (tw_timer_trace) (tw, timer_id, user_id, t - tw->timers);
284 : #endif
285 3 : }
286 :
287 : /**
288 : * @brief Start a Tw Timer
289 : * @param tw_timer_wheel_t * tw timer wheel object pointer
290 : * @param u32 user_id user defined timer id, presumably for a tw session
291 : * @param u32 timer_id app-specific timer ID. 4 bits.
292 : * @param u64 interval timer interval in ticks
293 : * @returns handle needed to cancel the timer
294 : */
295 : __clib_export u32
296 2271073 : TW (tw_timer_start) (TWT (tw_timer_wheel) * tw, u32 user_id, u32 timer_id,
297 : u64 interval)
298 : {
299 : TWT (tw_timer) * t;
300 :
301 2271073 : ASSERT (interval);
302 :
303 2271073 : pool_get (tw->timers, t);
304 2271073 : clib_memset (t, 0xff, sizeof (*t));
305 :
306 2271073 : t->user_handle = TW (make_internal_timer_handle) (user_id, timer_id);
307 :
308 2271073 : timer_add (tw, t, interval);
309 2271073 : return t - tw->timers;
310 : }
311 :
312 : #if TW_TIMER_SCAN_FOR_HANDLE > 0
313 : int TW (scan_for_handle) (TWT (tw_timer_wheel) * tw, u32 handle)
314 : {
315 : int i, j;
316 : tw_timer_wheel_slot_t *ts;
317 : TWT (tw_timer) * t, *head;
318 : u32 next_index;
319 : int rv = 0;
320 :
321 : for (i = 0; i < TW_TIMER_WHEELS; i++)
322 : {
323 : for (j = 0; j < TW_SLOTS_PER_RING; j++)
324 : {
325 : ts = &tw->w[i][j];
326 : head = pool_elt_at_index (tw->timers, ts->head_index);
327 : next_index = head->next;
328 :
329 : while (next_index != ts->head_index)
330 : {
331 : t = pool_elt_at_index (tw->timers, next_index);
332 : if (next_index == handle)
333 : {
334 : clib_warning ("handle %d found in ring %d slot %d",
335 : handle, i, j);
336 : clib_warning ("user handle 0x%x", t->user_handle);
337 : rv = 1;
338 : }
339 : next_index = t->next;
340 : }
341 : }
342 : }
343 : return rv;
344 : }
345 : #endif /* TW_TIMER_SCAN_FOR_HANDLE */
346 :
347 : /**
348 : * @brief Stop a tw timer
349 : * @param tw_timer_wheel_t * tw timer wheel object pointer
350 : * @param u32 handle timer cancellation returned by tw_timer_start
351 : */
352 460359 : __clib_export void TW (tw_timer_stop) (TWT (tw_timer_wheel) * tw, u32 handle)
353 : {
354 : TWT (tw_timer) * t;
355 :
356 : #if TW_TIMER_ALLOW_DUPLICATE_STOP
357 : /*
358 : * A vlib process may have its timer expire, and receive
359 : * an event before the expiration is processed.
360 : * That results in a duplicate tw_timer_stop.
361 : */
362 460359 : if (pool_is_free_index (tw->timers, handle))
363 0 : return;
364 : #endif
365 : #if TW_START_STOP_TRACE_SIZE > 0
366 : TW (tw_timer_trace) (tw, ~0, ~0, handle);
367 : #endif
368 :
369 460359 : t = pool_elt_at_index (tw->timers, handle);
370 :
371 : /* in case of idiotic handle (e.g. passing a listhead index) */
372 460359 : ASSERT (t->user_handle != ~0);
373 :
374 460359 : timer_remove (tw->timers, t);
375 :
376 460359 : pool_put_index (tw->timers, handle);
377 0 : }
378 :
379 : __clib_export int
380 454999 : TW (tw_timer_handle_is_free) (TWT (tw_timer_wheel) * tw, u32 handle)
381 : {
382 454999 : return pool_is_free_index (tw->timers, handle);
383 : }
384 :
385 : /**
386 : * @brief Update a tw timer
387 : * @param tw_timer_wheel_t * tw timer wheel object pointer
388 : * @param u32 handle timer returned by tw_timer_start
389 : * @param u32 interval timer interval in ticks
390 : */
391 : __clib_export void
392 38846 : TW (tw_timer_update) (TWT (tw_timer_wheel) * tw, u32 handle, u64 interval)
393 : {
394 : TWT (tw_timer) * t;
395 38846 : t = pool_elt_at_index (tw->timers, handle);
396 38846 : timer_remove (tw->timers, t);
397 38846 : timer_add (tw, t, interval);
398 38846 : }
399 :
400 : /**
401 : * @brief Initialize a tw timer wheel template instance
402 : * @param tw_timer_wheel_t * tw timer wheel object pointer
403 : * @param void * expired_timer_callback. Passed a u32 * vector of
404 : * expired timer handles. The callback is optional.
405 : * @param f64 timer_interval_in_seconds
406 : */
407 : __clib_export void
408 2466 : TW (tw_timer_wheel_init) (TWT (tw_timer_wheel) * tw,
409 : void *expired_timer_callback,
410 : f64 timer_interval_in_seconds, u32 max_expirations)
411 : {
412 : int ring, slot;
413 : tw_timer_wheel_slot_t *ts;
414 : TWT (tw_timer) * t;
415 2466 : clib_memset (tw, 0, sizeof (*tw));
416 2466 : tw->expired_timer_callback = expired_timer_callback;
417 2466 : tw->max_expirations = max_expirations;
418 2466 : if (timer_interval_in_seconds == 0.0)
419 : {
420 0 : clib_warning ("timer interval is zero");
421 0 : abort ();
422 : }
423 2466 : tw->timer_interval = timer_interval_in_seconds;
424 2466 : tw->ticks_per_second = 1.0 / timer_interval_in_seconds;
425 :
426 2466 : vec_validate (tw->expired_timer_handles, 0);
427 2466 : vec_set_len (tw->expired_timer_handles, 0);
428 :
429 9119 : for (ring = 0; ring < TW_TIMER_WHEELS; ring++)
430 : {
431 6281720 : for (slot = 0; slot < TW_SLOTS_PER_RING; slot++)
432 : {
433 6275070 : ts = &tw->w[ring][slot];
434 6275070 : pool_get (tw->timers, t);
435 6275070 : clib_memset (t, 0xff, sizeof (*t));
436 6275070 : t->next = t->prev = t - tw->timers;
437 6275070 : ts->head_index = t - tw->timers;
438 : }
439 : }
440 :
441 : #if TW_OVERFLOW_VECTOR > 0
442 1771 : ts = &tw->overflow;
443 1771 : pool_get (tw->timers, t);
444 1771 : clib_memset (t, 0xff, sizeof (*t));
445 1771 : t->next = t->prev = t - tw->timers;
446 1771 : ts->head_index = t - tw->timers;
447 : #endif
448 2466 : }
449 :
450 : /**
451 : * @brief Free a tw timer wheel template instance
452 : * @param tw_timer_wheel_t * tw timer wheel object pointer
453 : */
454 0 : __clib_export void TW (tw_timer_wheel_free) (TWT (tw_timer_wheel) * tw)
455 : {
456 : int i, j;
457 : tw_timer_wheel_slot_t *ts;
458 : TWT (tw_timer) * head, *t;
459 : u32 next_index;
460 :
461 0 : for (i = 0; i < TW_TIMER_WHEELS; i++)
462 : {
463 0 : for (j = 0; j < TW_SLOTS_PER_RING; j++)
464 : {
465 0 : ts = &tw->w[i][j];
466 0 : head = pool_elt_at_index (tw->timers, ts->head_index);
467 0 : next_index = head->next;
468 :
469 0 : while (next_index != ts->head_index)
470 : {
471 0 : t = pool_elt_at_index (tw->timers, next_index);
472 0 : next_index = t->next;
473 0 : pool_put (tw->timers, t);
474 : }
475 0 : pool_put (tw->timers, head);
476 : }
477 : }
478 :
479 : #if TW_OVERFLOW_VECTOR > 0
480 0 : ts = &tw->overflow;
481 0 : head = pool_elt_at_index (tw->timers, ts->head_index);
482 0 : next_index = head->next;
483 :
484 0 : while (next_index != ts->head_index)
485 : {
486 0 : t = pool_elt_at_index (tw->timers, next_index);
487 0 : next_index = t->next;
488 0 : pool_put (tw->timers, t);
489 : }
490 0 : pool_put (tw->timers, head);
491 : #endif
492 :
493 0 : clib_memset (tw, 0, sizeof (*tw));
494 0 : }
495 :
496 : /**
497 : * @brief Advance a tw timer wheel. Calls the expired timer callback
498 : * as needed. This routine should be called once every timer_interval seconds
499 : * @param tw_timer_wheel_t * tw timer wheel template instance pointer
500 : * @param f64 now the current time, e.g. from vlib_time_now(vm)
501 : * @returns u32 * vector of expired user handles
502 : */
503 : static inline
504 748279867 : u32 * TW (tw_timer_expire_timers_internal) (TWT (tw_timer_wheel) * tw,
505 : f64 now,
506 : u32 * callback_vector_arg)
507 : {
508 : u32 nticks, i;
509 : tw_timer_wheel_slot_t *ts;
510 : TWT (tw_timer) * t, *head;
511 : u32 *callback_vector;
512 : u32 fast_wheel_index;
513 : u32 next_index;
514 : u32 slow_wheel_index __attribute__ ((unused));
515 : u32 glacier_wheel_index __attribute__ ((unused));
516 :
517 : /* Called too soon to process new timer expirations? */
518 748279867 : if (PREDICT_FALSE (now < tw->next_run_time))
519 680127258 : return callback_vector_arg;
520 :
521 : /* Number of ticks which have occurred */
522 68152562 : nticks = tw->ticks_per_second * (now - tw->last_run_time);
523 68152562 : if (nticks == 0)
524 3 : return callback_vector_arg;
525 :
526 : /* Remember when we ran, compute next runtime */
527 68152559 : tw->next_run_time = (now + tw->timer_interval);
528 :
529 : /* First call, or time jumped backwards? */
530 68152559 : if (PREDICT_FALSE
531 : ((tw->last_run_time == 0.0) || (now <= tw->last_run_time)))
532 : {
533 31 : tw->last_run_time = now;
534 31 : return callback_vector_arg;
535 : }
536 :
537 68223895 : if (callback_vector_arg == 0)
538 : {
539 68221605 : vec_set_len (tw->expired_timer_handles, 0);
540 68218605 : callback_vector = tw->expired_timer_handles;
541 : }
542 : else
543 2389 : callback_vector = callback_vector_arg;
544 :
545 832803063 : for (i = 0; i < nticks; i++)
546 : {
547 764582428 : fast_wheel_index = tw->current_index[TW_TIMER_RING_FAST];
548 : if (TW_TIMER_WHEELS > 1)
549 764582362 : slow_wheel_index = tw->current_index[TW_TIMER_RING_SLOW];
550 : if (TW_TIMER_WHEELS > 2)
551 763408000 : glacier_wheel_index = tw->current_index[TW_TIMER_RING_GLACIER];
552 :
553 : #if TW_OVERFLOW_VECTOR > 0
554 : /* Triple odometer-click? Process the overflow vector... */
555 763408000 : if (PREDICT_FALSE (fast_wheel_index == TW_SLOTS_PER_RING
556 : && slow_wheel_index == TW_SLOTS_PER_RING
557 : && glacier_wheel_index == TW_SLOTS_PER_RING))
558 : {
559 : u64 interval;
560 : u32 new_glacier_ring_offset, new_slow_ring_offset;
561 : u32 new_fast_ring_offset;
562 :
563 0 : ts = &tw->overflow;
564 0 : head = pool_elt_at_index (tw->timers, ts->head_index);
565 0 : next_index = head->next;
566 :
567 : /* Make slot empty */
568 0 : head->next = head->prev = ts->head_index;
569 :
570 : /* traverse slot, place timers wherever they go */
571 0 : while (next_index != head - tw->timers)
572 : {
573 0 : t = pool_elt_at_index (tw->timers, next_index);
574 0 : next_index = t->next;
575 :
576 : /* Remove from the overflow vector (hammer) */
577 0 : t->next = t->prev = ~0;
578 :
579 0 : ASSERT (t->expiration_time >= tw->current_tick);
580 :
581 0 : interval = t->expiration_time - tw->current_tick;
582 :
583 : /* Right back onto the overflow vector? */
584 0 : if (interval >= (1 << (3 * TW_RING_SHIFT)))
585 : {
586 0 : ts = &tw->overflow;
587 0 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
588 0 : continue;
589 : }
590 : /* Compute ring offsets */
591 0 : new_glacier_ring_offset = interval >> (2 * TW_RING_SHIFT);
592 :
593 0 : interval -= (new_glacier_ring_offset << (2 * TW_RING_SHIFT));
594 :
595 : /* Note: the wheels are at (0,0,0), no add-with-carry needed */
596 0 : new_slow_ring_offset = interval >> TW_RING_SHIFT;
597 0 : interval -= (new_slow_ring_offset << TW_RING_SHIFT);
598 0 : new_fast_ring_offset = interval & TW_RING_MASK;
599 0 : t->slow_ring_offset = new_slow_ring_offset;
600 0 : t->fast_ring_offset = new_fast_ring_offset;
601 :
602 : /* Timer expires Right Now */
603 0 : if (PREDICT_FALSE (t->slow_ring_offset == 0 &&
604 : t->fast_ring_offset == 0 &&
605 : new_glacier_ring_offset == 0))
606 : {
607 0 : vec_add1 (callback_vector, t->user_handle);
608 : #if TW_START_STOP_TRACE_SIZE > 0
609 : TW (tw_timer_trace) (tw, 0xfe, t->user_handle,
610 : t - tw->timers);
611 : #endif
612 0 : pool_put (tw->timers, t);
613 : }
614 : /* Timer moves to the glacier ring */
615 0 : else if (new_glacier_ring_offset)
616 : {
617 0 : ts = &tw->w[TW_TIMER_RING_GLACIER][new_glacier_ring_offset];
618 0 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
619 : }
620 : /* Timer moves to the slow ring */
621 0 : else if (t->slow_ring_offset)
622 : {
623 : /* Add to slow ring */
624 0 : ts = &tw->w[TW_TIMER_RING_SLOW][t->slow_ring_offset];
625 0 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
626 : }
627 : /* Timer timer moves to the fast ring */
628 : else
629 : {
630 0 : ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
631 0 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
632 : #if TW_FAST_WHEEL_BITMAP
633 0 : tw->fast_slot_bitmap =
634 0 : clib_bitmap_set (tw->fast_slot_bitmap,
635 0 : t->fast_ring_offset, 1);
636 : #endif
637 : }
638 : }
639 : }
640 : #endif
641 :
642 : #if TW_TIMER_WHEELS > 2
643 : /*
644 : * Double odometer-click? Process one slot in the glacier ring...
645 : */
646 763408000 : if (PREDICT_FALSE (fast_wheel_index == TW_SLOTS_PER_RING
647 : && slow_wheel_index == TW_SLOTS_PER_RING))
648 : {
649 500 : glacier_wheel_index %= TW_SLOTS_PER_RING;
650 500 : ts = &tw->w[TW_TIMER_RING_GLACIER][glacier_wheel_index];
651 :
652 500 : head = pool_elt_at_index (tw->timers, ts->head_index);
653 500 : next_index = head->next;
654 :
655 : /* Make slot empty */
656 500 : head->next = head->prev = ts->head_index;
657 :
658 : /* traverse slot, deal timers into slow ring */
659 4593 : while (next_index != head - tw->timers)
660 : {
661 4093 : t = pool_elt_at_index (tw->timers, next_index);
662 4093 : next_index = t->next;
663 :
664 : /* Remove from glacier ring slot (hammer) */
665 4093 : t->next = t->prev = ~0;
666 :
667 : /* Timer expires Right Now */
668 4093 : if (PREDICT_FALSE (t->slow_ring_offset == 0 &&
669 : t->fast_ring_offset == 0))
670 : {
671 2 : vec_add1 (callback_vector, t->user_handle);
672 : #if TW_START_STOP_TRACE_SIZE > 0
673 : TW (tw_timer_trace) (tw, 0xfe, t->user_handle,
674 : t - tw->timers);
675 : #endif
676 2 : pool_put (tw->timers, t);
677 : }
678 : /* Timer expires during slow-wheel tick 0 */
679 4091 : else if (PREDICT_FALSE (t->slow_ring_offset == 0))
680 : {
681 246 : ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
682 246 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
683 : #if TW_FAST_WHEEL_BITMAP
684 246 : tw->fast_slot_bitmap =
685 246 : clib_bitmap_set (tw->fast_slot_bitmap,
686 246 : t->fast_ring_offset, 1);
687 : #endif
688 : }
689 : else /* typical case */
690 : {
691 : /* Add to slow ring */
692 3845 : ts = &tw->w[TW_TIMER_RING_SLOW][t->slow_ring_offset];
693 3845 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
694 : }
695 : }
696 : }
697 : #endif
698 :
699 : #if TW_TIMER_WHEELS > 1
700 : /*
701 : * Single odometer-click? Process a slot in the slow ring,
702 : */
703 764582362 : if (PREDICT_FALSE (fast_wheel_index == TW_SLOTS_PER_RING))
704 : {
705 746355 : slow_wheel_index %= TW_SLOTS_PER_RING;
706 746355 : ts = &tw->w[TW_TIMER_RING_SLOW][slow_wheel_index];
707 :
708 746355 : head = pool_elt_at_index (tw->timers, ts->head_index);
709 746355 : next_index = head->next;
710 :
711 : /* Make slot empty */
712 746355 : head->next = head->prev = ts->head_index;
713 :
714 : /* traverse slot, deal timers into fast ring */
715 1100228 : while (next_index != head - tw->timers)
716 : {
717 353873 : t = pool_elt_at_index (tw->timers, next_index);
718 353873 : next_index = t->next;
719 :
720 : /* Remove from sloe ring slot (hammer) */
721 353873 : t->next = t->prev = ~0;
722 :
723 : /* Timer expires Right Now */
724 353873 : if (PREDICT_FALSE (t->fast_ring_offset == 0))
725 : {
726 1735 : vec_add1 (callback_vector, t->user_handle);
727 : #if TW_START_STOP_TRACE_SIZE > 0
728 : TW (tw_timer_trace) (tw, 0xfe, t->user_handle,
729 : t - tw->timers);
730 : #endif
731 1735 : pool_put (tw->timers, t);
732 : }
733 : else /* typical case */
734 : {
735 : /* Add to fast ring */
736 352138 : ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
737 352138 : timer_addhead (tw->timers, ts->head_index, t - tw->timers);
738 : #if TW_FAST_WHEEL_BITMAP
739 352090 : tw->fast_slot_bitmap =
740 352090 : clib_bitmap_set (tw->fast_slot_bitmap,
741 352090 : t->fast_ring_offset, 1);
742 : #endif
743 : }
744 : }
745 : }
746 : #endif
747 :
748 : /* Handle the fast ring */
749 764582428 : fast_wheel_index %= TW_SLOTS_PER_RING;
750 764582428 : ts = &tw->w[TW_TIMER_RING_FAST][fast_wheel_index];
751 :
752 764582428 : head = pool_elt_at_index (tw->timers, ts->head_index);
753 764583338 : next_index = head->next;
754 :
755 : /* Make slot empty */
756 764583338 : head->next = head->prev = ts->head_index;
757 :
758 : /* Construct vector of expired timer handles to give the user */
759 766377485 : while (next_index != ts->head_index)
760 : {
761 1794789 : t = pool_elt_at_index (tw->timers, next_index);
762 1794789 : next_index = t->next;
763 1794789 : vec_add1 (callback_vector, t->user_handle);
764 : #if TW_START_STOP_TRACE_SIZE > 0
765 : TW (tw_timer_trace) (tw, 0xfe, t->user_handle, t - tw->timers);
766 : #endif
767 1794789 : pool_put (tw->timers, t);
768 : }
769 :
770 : /* If any timers expired, tell the user */
771 764583318 : if (callback_vector_arg == 0 && vec_len (callback_vector))
772 : {
773 : /* The callback is optional. We return the u32 * handle vector */
774 1638597 : if (tw->expired_timer_callback)
775 : {
776 1638608 : tw->expired_timer_callback (callback_vector);
777 1638608 : vec_reset_length (callback_vector);
778 : }
779 1638608 : tw->expired_timer_handles = callback_vector;
780 : }
781 :
782 : #if TW_FAST_WHEEL_BITMAP
783 763408000 : tw->fast_slot_bitmap = clib_bitmap_set (tw->fast_slot_bitmap,
784 : fast_wheel_index, 0);
785 : #endif
786 :
787 764582868 : tw->current_tick++;
788 764582868 : fast_wheel_index++;
789 764582868 : tw->current_index[TW_TIMER_RING_FAST] = fast_wheel_index;
790 :
791 : #if TW_TIMER_WHEELS > 1
792 764582802 : if (PREDICT_FALSE (fast_wheel_index == TW_SLOTS_PER_RING))
793 746356 : slow_wheel_index++;
794 764582802 : tw->current_index[TW_TIMER_RING_SLOW] = slow_wheel_index;
795 : #endif
796 :
797 : #if TW_TIMER_WHEELS > 2
798 763408000 : if (PREDICT_FALSE (slow_wheel_index == TW_SLOTS_PER_RING))
799 500 : glacier_wheel_index++;
800 763408000 : tw->current_index[TW_TIMER_RING_GLACIER] = glacier_wheel_index;
801 : #endif
802 :
803 764582868 : if (vec_len (callback_vector) >= tw->max_expirations)
804 0 : break;
805 : }
806 :
807 68220737 : if (callback_vector_arg == 0)
808 68220045 : tw->expired_timer_handles = callback_vector;
809 :
810 68220737 : tw->last_run_time += i * tw->timer_interval;
811 68220737 : return callback_vector;
812 : }
813 :
814 748262967 : __clib_export u32 *TW (tw_timer_expire_timers) (TWT (tw_timer_wheel) * tw,
815 : f64 now)
816 : {
817 748262967 : return TW (tw_timer_expire_timers_internal) (tw, now, 0 /* no vector */ );
818 : }
819 :
820 4840 : __clib_export u32 *TW (tw_timer_expire_timers_vec) (TWT (tw_timer_wheel) * tw,
821 : f64 now, u32 * vec)
822 : {
823 4840 : return TW (tw_timer_expire_timers_internal) (tw, now, vec);
824 : }
825 :
826 : #if TW_FAST_WHEEL_BITMAP
827 : /** Returns an approximation to the first timer expiration in
828 : * timer-ticks from "now". To avoid wasting an unjustifiable
829 : * amount of time on the problem, we maintain an approximate fast-wheel slot
830 : * occupancy bitmap. We don't worry about clearing fast wheel bits
831 : * when timers are removed from fast wheel slots.
832 : */
833 :
834 : __clib_export u32
835 84951900 : TW (tw_timer_first_expires_in_ticks) (TWT (tw_timer_wheel) * tw)
836 : {
837 : u32 first_expiring_index, fast_ring_index;
838 : i32 delta;
839 :
840 : #if TW_TIMER_WHEELS > 1
841 84951900 : fast_ring_index = tw->current_index[TW_TIMER_RING_FAST];
842 84951900 : if (fast_ring_index == TW_SLOTS_PER_RING)
843 722762 : return 1;
844 :
845 84229100 : first_expiring_index = clib_bitmap_next_set (tw->fast_slot_bitmap,
846 : fast_ring_index);
847 84229100 : if (first_expiring_index == ~0)
848 24511600 : first_expiring_index = TW_SLOTS_PER_RING;
849 :
850 : #else
851 :
852 : if (clib_bitmap_is_zero (tw->fast_slot_bitmap))
853 : return TW_SLOTS_PER_RING;
854 :
855 : fast_ring_index = tw->current_index[TW_TIMER_RING_FAST];
856 : if (fast_ring_index == TW_SLOTS_PER_RING)
857 : fast_ring_index = 0;
858 :
859 : first_expiring_index = clib_bitmap_next_set (tw->fast_slot_bitmap,
860 : fast_ring_index);
861 : if (first_expiring_index == ~0 && fast_ring_index != 0)
862 : first_expiring_index = clib_bitmap_first_set (tw->fast_slot_bitmap);
863 : #endif
864 :
865 84229100 : ASSERT (first_expiring_index != ~0);
866 :
867 84229100 : delta = (i32) first_expiring_index - (i32) fast_ring_index;
868 84229100 : if (delta < 0)
869 0 : delta += TW_SLOTS_PER_RING;
870 :
871 84229100 : ASSERT (delta >= 0);
872 :
873 84229100 : return (u32) delta;
874 : }
875 :
876 : #endif
877 :
878 : /*
879 : * fd.io coding-style-patch-verification: ON
880 : *
881 : * Local Variables:
882 : * eval: (c-set-style "gnu")
883 : * End:
884 : */
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