aboutsummaryrefslogtreecommitdiffstats
path: root/gmod/configure.ac
diff options
context:
space:
mode:
authorMatus Fabian <matfabia@cisco.com>2018-06-13 05:39:07 -0700
committerOle Trøan <otroan@employees.org>2018-06-15 06:53:24 +0000
commita6110b6ea5a066b64005347850f61df9a2000fe9 (patch)
treee8c836dadfe7238592ef5baaabc9cf520c5e813f /gmod/configure.ac
parente43832c7e77b8b008ab452386b143bb3f7f5be40 (diff)
NAT44: endpoint dependent mode (VPP-1273)
To enable NAT plugin endpoint dependent mode add following to statrup config: nat { endpoint-dependent } Enable endpoint dependent filtering and mapping for all sessions. Move some existing functionality such as service load balancing, twice nat, out2in-only static mappings and unknown protocol dynamic translations, which use endpoint dependent lookup hash tables before. Basically split to vanilla NAT44 and extra features NAT44. Change-Id: I3925eb5ddcc8f1ec4cf6af4e2a618a7ec7aa9735 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'gmod/configure.ac')
0 files changed, 0 insertions, 0 deletions
>146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
/*
 * Copyright (c) 2015 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.
 */
#include <vppinfra/bitmap.h>
#include <vppinfra/hash.h>
#include <vppinfra/pool.h>
#include <vppinfra/timing_wheel.h>

void
timing_wheel_init (timing_wheel_t * w, u64 current_cpu_time,
		   f64 cpu_clocks_per_second)
{
  if (w->max_sched_time <= w->min_sched_time)
    {
      w->min_sched_time = 1e-6;
      w->max_sched_time = 1e-3;
    }

  w->cpu_clocks_per_second = cpu_clocks_per_second;
  w->log2_clocks_per_bin =
    max_log2 (w->cpu_clocks_per_second * w->min_sched_time);
  w->log2_bins_per_wheel =
    max_log2 (w->cpu_clocks_per_second * w->max_sched_time);
  w->log2_bins_per_wheel -= w->log2_clocks_per_bin;
  w->log2_clocks_per_wheel = w->log2_bins_per_wheel + w->log2_clocks_per_bin;
  w->bins_per_wheel = 1 << w->log2_bins_per_wheel;
  w->bins_per_wheel_mask = w->bins_per_wheel - 1;

  w->current_time_index = current_cpu_time >> w->log2_clocks_per_bin;

  if (w->n_wheel_elt_time_bits <= 0 ||
      w->n_wheel_elt_time_bits >= STRUCT_BITS_OF (timing_wheel_elt_t,
						  cpu_time_relative_to_base))
    w->n_wheel_elt_time_bits =
      STRUCT_BITS_OF (timing_wheel_elt_t, cpu_time_relative_to_base) - 1;

  w->cpu_time_base = current_cpu_time;
  w->time_index_next_cpu_time_base_update
    =
    w->current_time_index +
    ((u64) 1 << (w->n_wheel_elt_time_bits - w->log2_clocks_per_bin));
}

always_inline uword
get_level_and_relative_time (timing_wheel_t * w, u64 cpu_time,
			     uword * rtime_result)
{
  u64 dt, rtime;
  uword level_index;

  dt = (cpu_time >> w->log2_clocks_per_bin);

  /* Time should always move forward. */
  ASSERT (dt >= w->current_time_index);

  dt -= w->current_time_index;

  /* Find level and offset within level.  Level i has bins of size 2^((i+1)*M) */
  rtime = dt;
  for (level_index = 0; (rtime >> w->log2_bins_per_wheel) != 0; level_index++)
    rtime = (rtime >> w->log2_bins_per_wheel) - 1;

  /* Return offset within level and level index. */
  ASSERT (rtime < w->bins_per_wheel);
  *rtime_result = rtime;
  return level_index;
}

always_inline uword
time_index_to_wheel_index (timing_wheel_t * w, uword level_index, u64 ti)
{
  return (ti >> (level_index * w->log2_bins_per_wheel)) &
    w->bins_per_wheel_mask;
}

/* Find current time on this level. */
always_inline uword
current_time_wheel_index (timing_wheel_t * w, uword level_index)
{
  return time_index_to_wheel_index (w, level_index, w->current_time_index);
}

/* Circular wheel indexing. */
always_inline uword
wheel_add (timing_wheel_t * w, word x)
{
  return x & w->bins_per_wheel_mask;
}

always_inline uword
rtime_to_wheel_index (timing_wheel_t * w, uword level_index, uword rtime)
{
  uword t = current_time_wheel_index (w, level_index);
  return wheel_add (w, t + rtime);
}

static clib_error_t *
validate_level (timing_wheel_t * w, uword level_index, uword * n_elts)
{
  timing_wheel_level_t *level;
  timing_wheel_elt_t *e;
  uword wi;
  clib_error_t *error = 0;

#define _(x)					\
  do {						\
    error = CLIB_ERROR_ASSERT (x);		\
    ASSERT (! error);				\
    if (error) return error;			\
  } while (0)

  level = vec_elt_at_index (w->levels, level_index);
  for (wi = 0; wi < vec_len (level->elts); wi++)
    {
      /* Validate occupancy bitmap. */
      _(clib_bitmap_get_no_check (level->occupancy_bitmap, wi) ==
	(vec_len (level->elts[wi]) > 0));

      *n_elts += vec_len (level->elts[wi]);

      vec_foreach (e, level->elts[wi])
      {
	/* Validate time bin and level. */
	u64 e_time;
	uword e_ti, e_li, e_wi;

	e_time = e->cpu_time_relative_to_base + w->cpu_time_base;
	e_li = get_level_and_relative_time (w, e_time, &e_ti);
	e_wi = rtime_to_wheel_index (w, level_index, e_ti);

	if (e_li == level_index - 1)
	  /* If this element was scheduled on the previous level
	     it must be wrapped. */
	  _(e_ti + current_time_wheel_index (w, level_index - 1)
	    >= w->bins_per_wheel);
	else
	  {
	    _(e_li == level_index);
	    if (e_li == 0)
	      _(e_wi == wi);
	    else
	      _(e_wi == wi || e_wi + 1 == wi || e_wi - 1 == wi);
	  }
      }
    }

#undef _

  return error;
}

void
timing_wheel_validate (timing_wheel_t * w)
{
  uword l;
  clib_error_t *error = 0;
  uword n_elts;

  if (!w->validate)
    return;

  n_elts = pool_elts (w->overflow_pool);
  for (l = 0; l < vec_len (w->levels); l++)
    {
      error = validate_level (w, l, &n_elts);
      if (error)
	clib_error_report (error);
    }
}

always_inline void
free_elt_vector (timing_wheel_t * w, timing_wheel_elt_t * ev)
{
  /* Poison free elements so we never use them by mistake. */
  if (CLIB_DEBUG > 0)
    clib_memset (ev, ~0, vec_len (ev) * sizeof (ev[0]));
  _vec_len (ev) = 0;
  vec_add1 (w->free_elt_vectors, ev);
}

static timing_wheel_elt_t *
insert_helper (timing_wheel_t * w, uword level_index, uword rtime)
{
  timing_wheel_level_t *level;
  timing_wheel_elt_t *e;
  uword wheel_index;

  /* Circular buffer. */
  vec_validate (w->levels, level_index);
  level = vec_elt_at_index (w->levels, level_index);

  if (PREDICT_FALSE (!level->elts))
    {
      uword max = w->bins_per_wheel - 1;
      clib_bitmap_validate (level->occupancy_bitmap, max);
      vec_validate (level->elts, max);
    }

  wheel_index = rtime_to_wheel_index (w, level_index, rtime);

  level->occupancy_bitmap =
    clib_bitmap_ori (level->occupancy_bitmap, wheel_index);

  /* Allocate an elt vector from free list if there is one. */
  if (!level->elts[wheel_index] && vec_len (w->free_elt_vectors))
    level->elts[wheel_index] = vec_pop (w->free_elt_vectors);

  /* Add element to vector for this time bin. */
  vec_add2 (level->elts[wheel_index], e, 1);

  return e;
}

/* Insert user data on wheel at given CPU time stamp. */
static void
timing_wheel_insert_helper (timing_wheel_t * w, u64 insert_cpu_time,
			    u32 user_data)
{
  timing_wheel_elt_t *e;
  u64 dt;
  uword rtime, level_index;

  level_index = get_level_and_relative_time (w, insert_cpu_time, &rtime);

  dt = insert_cpu_time - w->cpu_time_base;
  if (PREDICT_TRUE (0 == (dt >> BITS (e->cpu_time_relative_to_base))))
    {
      e = insert_helper (w, level_index, rtime);
      e->user_data = user_data;
      e->cpu_time_relative_to_base = dt;
      if (insert_cpu_time < w->cached_min_cpu_time_on_wheel)
	w->cached_min_cpu_time_on_wheel = insert_cpu_time;
    }
  else
    {
      /* Time too far in the future: add to overflow vector. */
      timing_wheel_overflow_elt_t *oe;
      pool_get (w->overflow_pool, oe);
      oe->user_data = user_data;
      oe->cpu_time = insert_cpu_time;
    }
}

always_inline uword
elt_is_deleted (timing_wheel_t * w, u32 user_data)
{
  return (hash_elts (w->deleted_user_data_hash) > 0
	  && hash_get (w->deleted_user_data_hash, user_data));
}

static timing_wheel_elt_t *
delete_user_data (timing_wheel_elt_t * elts, u32 user_data)
{
  uword found_match;
  timing_wheel_elt_t *e, *new_elts;

  /* Quickly scan to see if there are any elements to delete
     in this bucket. */
  found_match = 0;
  vec_foreach (e, elts)
  {
    found_match = e->user_data == user_data;
    if (found_match)
      break;
  }
  if (!found_match)
    return elts;

  /* Re-scan to build vector of new elts with matching user_data deleted. */
  new_elts = 0;
  vec_foreach (e, elts)
  {
    if (e->user_data != user_data)
      vec_add1 (new_elts, e[0]);
  }

  vec_free (elts);
  return new_elts;
}

/* Insert user data on wheel at given CPU time stamp. */
void
timing_wheel_insert (timing_wheel_t * w, u64 insert_cpu_time, u32 user_data)
{
  /* Remove previously deleted elements. */
  if (elt_is_deleted (w, user_data))
    {
      timing_wheel_level_t *l;
      uword wi;

      /* Delete elts with given user data so that stale events don't expire. */
      vec_foreach (l, w->levels)
      {
	  /* *INDENT-OFF* */
	  clib_bitmap_foreach (wi, l->occupancy_bitmap, ({
	    l->elts[wi] = delete_user_data (l->elts[wi], user_data);
	    if (vec_len (l->elts[wi]) == 0)
	      l->occupancy_bitmap = clib_bitmap_andnoti (l->occupancy_bitmap, wi);
	  }));
	  /* *INDENT-ON* */
      }

      {
	timing_wheel_overflow_elt_t *oe;
	/* *INDENT-OFF* */
	pool_foreach (oe, w->overflow_pool, ({
	  if (oe->user_data == user_data)
	    pool_put (w->overflow_pool, oe);
	}));
	/* *INDENT-ON* */
      }

      hash_unset (w->deleted_user_data_hash, user_data);
    }

  timing_wheel_insert_helper (w, insert_cpu_time, user_data);
}

void
timing_wheel_delete (timing_wheel_t * w, u32 user_data)
{
  if (!w->deleted_user_data_hash)
    w->deleted_user_data_hash =
      hash_create ( /* capacity */ 0, /* value bytes */ 0);

  hash_set1 (w->deleted_user_data_hash, user_data);
}

/* Returns time of next expiring element. */
u64
timing_wheel_next_expiring_elt_time (timing_wheel_t * w)
{
  timing_wheel_level_t *l;
  timing_wheel_elt_t *e;
  uword li, wi, wi0;
  u32 min_dt;
  u64 min_t;
  uword wrapped = 0;

  min_dt = ~0;
  min_t = ~0ULL;
  vec_foreach (l, w->levels)
  {
    if (!l->occupancy_bitmap)
      continue;

    li = l - w->levels;
    wi0 = wi = current_time_wheel_index (w, li);
    wrapped = 0;
    while (1)
      {
	if (clib_bitmap_get_no_check (l->occupancy_bitmap, wi))
	  {
	    vec_foreach (e, l->elts[wi])
	      min_dt = clib_min (min_dt, e->cpu_time_relative_to_base);

	    if (wrapped && li + 1 < vec_len (w->levels))
	      {
		uword wi1 = current_time_wheel_index (w, li + 1);
		if (l[1].occupancy_bitmap
		    && clib_bitmap_get_no_check (l[1].occupancy_bitmap, wi1))
		  {
		    vec_foreach (e, l[1].elts[wi1])
		    {
		      min_dt =
			clib_min (min_dt, e->cpu_time_relative_to_base);
		    }
		  }
	      }

	    min_t = w->cpu_time_base + min_dt;
	    goto done;
	  }

	wi = wheel_add (w, wi + 1);
	if (wi == wi0)
	  break;

	wrapped = wi != wi + 1;
      }
  }

  {
    timing_wheel_overflow_elt_t *oe;

    if (min_dt != ~0)
      min_t = w->cpu_time_base + min_dt;

    /* *INDENT-OFF* */
    pool_foreach (oe, w->overflow_pool,
		  ({ min_t = clib_min (min_t, oe->cpu_time); }));
    /* *INDENT-ON* */

  done:
    return min_t;
  }
}

static inline void
insert_elt (timing_wheel_t * w, timing_wheel_elt_t * e)
{
  u64 t = w->cpu_time_base + e->cpu_time_relative_to_base;
  timing_wheel_insert_helper (w, t, e->user_data);
}

always_inline u64
elt_cpu_time (timing_wheel_t * w, timing_wheel_elt_t * e)
{
  return w->cpu_time_base + e->cpu_time_relative_to_base;
}

always_inline void
validate_expired_elt (timing_wheel_t * w, timing_wheel_elt_t * e,
		      u64 current_cpu_time)
{
  if (CLIB_DEBUG > 0)
    {
      u64 e_time = elt_cpu_time (w, e);

      /* Verify that element is actually expired. */
      ASSERT ((e_time >> w->log2_clocks_per_bin)
	      <= (current_cpu_time >> w->log2_clocks_per_bin));
    }
}

static u32 *
expire_bin (timing_wheel_t * w,
	    uword level_index,
	    uword wheel_index, u64 advance_cpu_time, u32 * expired_user_data)
{
  timing_wheel_level_t *level = vec_elt_at_index (w->levels, level_index);
  timing_wheel_elt_t *e;
  u32 *x;
  uword i, j, e_len;

  e = vec_elt (level->elts, wheel_index);
  e_len = vec_len (e);

  vec_add2 (expired_user_data, x, e_len);
  for (i = j = 0; i < e_len; i++)
    {
      validate_expired_elt (w, &e[i], advance_cpu_time);
      x[j] = e[i].user_data;

      /* Only advance if elt is not to be deleted. */
      j += !elt_is_deleted (w, e[i].user_data);
    }

  /* Adjust for deleted elts. */
  if (j < e_len)
    _vec_len (expired_user_data) -= e_len - j;

  free_elt_vector (w, e);

  level->elts[wheel_index] = 0;
  clib_bitmap_set_no_check (level->occupancy_bitmap, wheel_index, 0);

  return expired_user_data;
}

/* Called rarely. 32 bit times should only overflow every 4 seconds or so on a fast machine. */
static u32 *
advance_cpu_time_base (timing_wheel_t * w, u32 * expired_user_data)
{
  timing_wheel_level_t *l;
  timing_wheel_elt_t *e;
  u64 delta;

  w->stats.cpu_time_base_advances++;
  delta = ((u64) 1 << w->n_wheel_elt_time_bits);
  w->cpu_time_base += delta;
  w->time_index_next_cpu_time_base_update += delta >> w->log2_clocks_per_bin;

  vec_foreach (l, w->levels)
  {
    uword wi;
      /* *INDENT-OFF* */
      clib_bitmap_foreach (wi, l->occupancy_bitmap, ({
	vec_foreach (e, l->elts[wi])
	  {
	    /* This should always be true since otherwise we would have already expired
	       this element. Note that in the second half of this function we need
               to take care not to place the expired elements ourselves. */
	    ASSERT (e->cpu_time_relative_to_base >= delta);
	    e->cpu_time_relative_to_base -= delta;
	  }
      }));
      /* *INDENT-ON* */
  }

  /* See which overflow elements fit now. */
  {
    timing_wheel_overflow_elt_t *oe;
    /* *INDENT-OFF* */
    pool_foreach (oe, w->overflow_pool, ({
      /* It fits now into 32 bits. */
      if (0 == ((oe->cpu_time - w->cpu_time_base) >> BITS (e->cpu_time_relative_to_base)))
	{
	  u64 ti = oe->cpu_time >> w->log2_clocks_per_bin;
	  if (ti <= w->current_time_index)
	    {
	      /* This can happen when timing wheel is not advanced for a long time
		 (for example when at a gdb breakpoint for a while). */
              /* Note: the ti == w->current_time_index means it is also an expired timer */
	      if (! elt_is_deleted (w, oe->user_data))
		vec_add1 (expired_user_data, oe->user_data);
	    }
	  else
	    timing_wheel_insert_helper (w, oe->cpu_time, oe->user_data);
	  pool_put (w->overflow_pool, oe);
	}
    }));
    /* *INDENT-ON* */
  }
  return expired_user_data;
}

static u32 *
refill_level (timing_wheel_t * w,
	      uword level_index,
	      u64 advance_cpu_time,
	      uword from_wheel_index,
	      uword to_wheel_index, u32 * expired_user_data)
{
  timing_wheel_level_t *level;
  timing_wheel_elt_t *to_insert = w->unexpired_elts_pending_insert;
  u64 advance_time_index = advance_cpu_time >> w->log2_clocks_per_bin;

  vec_validate (w->stats.refills, level_index);
  w->stats.refills[level_index] += 1;

  if (level_index + 1 >= vec_len (w->levels))
    goto done;

  level = vec_elt_at_index (w->levels, level_index + 1);
  if (!level->occupancy_bitmap)
    goto done;

  while (1)
    {
      timing_wheel_elt_t *e, *es;

      if (clib_bitmap_get_no_check
	  (level->occupancy_bitmap, from_wheel_index))
	{
	  es = level->elts[from_wheel_index];
	  level->elts[from_wheel_index] = 0;
	  clib_bitmap_set_no_check (level->occupancy_bitmap, from_wheel_index,
				    0);

	  vec_foreach (e, es)
	  {
	    u64 e_time = elt_cpu_time (w, e);
	    u64 ti = e_time >> w->log2_clocks_per_bin;
	    if (ti <= advance_time_index)
	      {
		validate_expired_elt (w, e, advance_cpu_time);
		if (!elt_is_deleted (w, e->user_data))
		  vec_add1 (expired_user_data, e->user_data);
	      }
	    else
	      vec_add1 (to_insert, e[0]);
	  }
	  free_elt_vector (w, es);
	}

      if (from_wheel_index == to_wheel_index)
	break;

      from_wheel_index = wheel_add (w, from_wheel_index + 1);
    }

  timing_wheel_validate (w);
done:
  w->unexpired_elts_pending_insert = to_insert;
  return expired_user_data;
}

/* Advance wheel and return any expired user data in vector. */
u32 *
timing_wheel_advance (timing_wheel_t * w, u64 advance_cpu_time,
		      u32 * expired_user_data,
		      u64 * next_expiring_element_cpu_time)
{
  timing_wheel_level_t *level;
  uword level_index, advance_rtime, advance_level_index, advance_wheel_index;
  uword n_expired_user_data_before;
  u64 current_time_index, advance_time_index;

  n_expired_user_data_before = vec_len (expired_user_data);

  /* Re-fill lower levels when time wraps. */
  current_time_index = w->current_time_index;
  advance_time_index = advance_cpu_time >> w->log2_clocks_per_bin;

  {
    u64 current_ti, advance_ti;

    current_ti = current_time_index >> w->log2_bins_per_wheel;
    advance_ti = advance_time_index >> w->log2_bins_per_wheel;

    if (PREDICT_FALSE (current_ti != advance_ti))
      {
	if (w->unexpired_elts_pending_insert)
	  _vec_len (w->unexpired_elts_pending_insert) = 0;

	level_index = 0;
	while (current_ti != advance_ti)
	  {
	    uword c, a;
	    c = current_ti & (w->bins_per_wheel - 1);
	    a = advance_ti & (w->bins_per_wheel - 1);
	    if (c != a)
	      expired_user_data = refill_level (w,
						level_index,
						advance_cpu_time,
						c, a, expired_user_data);
	    current_ti >>= w->log2_bins_per_wheel;
	    advance_ti >>= w->log2_bins_per_wheel;
	    level_index++;
	  }
      }
  }

  advance_level_index =
    get_level_and_relative_time (w, advance_cpu_time, &advance_rtime);
  advance_wheel_index =
    rtime_to_wheel_index (w, advance_level_index, advance_rtime);

  /* Empty all occupied bins for entire levels that we advance past. */
  for (level_index = 0; level_index < advance_level_index; level_index++)
    {
      uword wi;

      if (level_index >= vec_len (w->levels))
	break;

      level = vec_elt_at_index (w->levels, level_index);
      /* *INDENT-OFF* */
      clib_bitmap_foreach (wi, level->occupancy_bitmap, ({
        expired_user_data = expire_bin (w, level_index, wi, advance_cpu_time,
					expired_user_data);
      }));
      /* *INDENT-ON* */
    }

  if (PREDICT_TRUE (level_index < vec_len (w->levels)))
    {
      uword wi;
      level = vec_elt_at_index (w->levels, level_index);
      wi = current_time_wheel_index (w, level_index);
      if (level->occupancy_bitmap)
	while (1)
	  {
	    if (clib_bitmap_get_no_check (level->occupancy_bitmap, wi))
	      expired_user_data =
		expire_bin (w, advance_level_index, wi, advance_cpu_time,
			    expired_user_data);

	    /* When we jump out, we have already just expired the bin,
	       corresponding to advance_wheel_index */
	    if (wi == advance_wheel_index)
	      break;

	    wi = wheel_add (w, wi + 1);
	  }
    }

  /* Advance current time index. */
  w->current_time_index = advance_time_index;

  if (vec_len (w->unexpired_elts_pending_insert) > 0)
    {
      timing_wheel_elt_t *e;
      vec_foreach (e, w->unexpired_elts_pending_insert) insert_elt (w, e);
      _vec_len (w->unexpired_elts_pending_insert) = 0;
    }

  /* Don't advance until necessary. */
  /* However, if the timing_wheel_advance() hasn't been called for some time,
     the while() loop will ensure multiple calls to advance_cpu_time_base()
     in a row until the w->cpu_time_base is fresh enough. */
  while (PREDICT_FALSE
	 (advance_time_index >= w->time_index_next_cpu_time_base_update))
    expired_user_data = advance_cpu_time_base (w, expired_user_data);

  if (next_expiring_element_cpu_time)
    {
      u64 min_t;

      /* Anything expired?  If so we need to recompute next expiring elt time. */
      if (vec_len (expired_user_data) == n_expired_user_data_before
	  && w->cached_min_cpu_time_on_wheel != 0ULL)
	min_t = w->cached_min_cpu_time_on_wheel;
      else
	{
	  min_t = timing_wheel_next_expiring_elt_time (w);
	  w->cached_min_cpu_time_on_wheel = min_t;
	}

      *next_expiring_element_cpu_time = min_t;
    }

  return expired_user_data;
}

u8 *
format_timing_wheel (u8 * s, va_list * va)
{
  timing_wheel_t *w = va_arg (*va, timing_wheel_t *);
  int verbose = va_arg (*va, int);
  u32 indent = format_get_indent (s);

  s = format (s, "level 0: %.4e - %.4e secs, 2^%d - 2^%d clocks",
	      (f64) (1 << w->log2_clocks_per_bin) / w->cpu_clocks_per_second,
	      (f64) (1 << w->log2_clocks_per_wheel) /
	      w->cpu_clocks_per_second, w->log2_clocks_per_bin,
	      w->log2_clocks_per_wheel);

  if (verbose)
    {
      int l;

      s = format (s, "\n%Utime base advances %Ld, every %.4e secs",
		  format_white_space, indent + 2,
		  w->stats.cpu_time_base_advances,
		  (f64) ((u64) 1 << w->n_wheel_elt_time_bits) /
		  w->cpu_clocks_per_second);

      for (l = 0; l < vec_len (w->levels); l++)
	s = format (s, "\n%Ulevel %d: refills %Ld",
		    format_white_space, indent + 2,
		    l,
		    l <
		    vec_len (w->stats.refills) ? w->stats.
		    refills[l] : (u64) 0);
    }

  return s;
}

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