summaryrefslogtreecommitdiffstats
path: root/src/vlib/node.c
blob: 2bb5bceadbcb26ca6b4b380dcb466e62fc7f698f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67

@media only all and (prefers-color-scheme: dark) {
.highlight .hll { background-color: #49483e }
.highlight .c { color: #75715e } /* Comment */
.highlight .err { color: #960050; background-color: #1e0010 } /* Error */
.highlight .k { color: #66d9ef } /* Keyword */
.highlight .l { color: #ae81ff } /* Literal */
.highlight .n { color: #f8f8f2 } /* Name */
.highlight .o { color: #f92672 } /* Operator */
.highlight .p { color: #f8f8f2 } /* Punctuation */
.highlight .ch { color: #75715e } /* Comment.Hashbang */
.highlight .cm { color: #75715e } /* Comment.Multiline */
.highlight .cp { color: #75715e } /* Comment.Preproc */
.highlight .cpf { color: #75715e } /* Comment.PreprocFile */
.highlight .c1 { color: #75715e } /* Comment.Single */
.highlight .cs { color: #75715e } /* Comment.Special */
.highlight .gd { color: #f92672 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gi { color: #a6e22e } /* Generic.Inserted */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #75715e } /* Generic.Subheading */
.highlight .kc { color: #66d9ef } /* Keyword.Constant */
.highlight .kd { color: #66d9ef } /* Keyword.Declaration */
.highlight .kn { color: #f92672 } /* Keyword.Namespace */
.highlight .kp { color: #66d9ef } /* Keyword.Pseudo */
.highlight .kr { color: #66d9ef } /* Keyword.Reserved */
.highlight .kt { color: #66d9ef } /* Keyword.Type */
.highlight .ld { color: #e6db74 } /* Literal.Date */
.highlight .m { color: #ae81ff } /* Literal.Number */
.highlight .s { color: #e6db74 } /* Literal.String */
.highlight .na { color: #a6e22e } /* Name.Attribute */
.highlight .nb { color: #f8f8f2 } /* Name.Builtin */
.highlight .nc { color: #a6e22e } /* Name.Class */
.highlight .no { color: #66d9ef } /* Name.Constant */
.highlight .nd { color: #a6e22e } /* Name.Decorator */
.highlight .ni { color: #f8f8f2 } /* Name.Entity */
.highlight .ne { color: #a6e22e } /* Name.Exception */
.highlight .nf { color: #a6e22e } /* Name.Function */
.highlight .nl { color: #f8f8f2 } /* Name.Label */
.highlight .nn { color: #f8f8f2 } /* Name.Namespace */
.highlight .nx { color: #a6e22e } /* Name.Other */
.highlight .py { color: #f8f8f2 } /* Name.Property */
.highlight .nt { color: #f92672 } /* Name.Tag */
.highlight .nv { color: #f8f8f2 } /* Name.Variable */
.highlight .ow { color: #f92672 } /* Operator.Word */
.highlight .w { color: #f8f8f2 } /* Text.Whitespace */
.highlight .mb { color: #ae81ff } /* Literal.Number.Bin */
.highlight .mf { color: #ae81ff } /* Literal.Number.Float */
.highlight .mh { color: #ae81ff } /* Literal.Number.Hex */
.highlight .mi { color: #ae81ff } /* Literal.Number.Integer */
.highlight .mo { color: #ae81ff } /* Literal.Number.Oct */
.highlight .sa { color: #e6db74 } /* Literal.String.Affix */
.highlight .sb { color: #e6db74 } /* Literal.String.Backtick */
.highlight .sc { color: #e6db74 } /* Literal.String.Char */
.highlight .dl { color: #e6db74 } /* Literal.String.Delimiter */
.highlight .sd { color: #e6db74 } /* Literal.String.Doc */
.highlight .s2 { color: #e6db74 } /* Literal.String.Double */
.highlight .se { color: #ae81ff } /* Literal.String.Escape */
.highlight .sh { color: #e6db74 } /* Literal.String.Heredoc */
.highlight .si { color: #e6db74 } /* Literal.String.Interpol */
.highlight .sx { color: #e6db74 } /* Literal.String.Other */
.highlight .sr { color: #e6db74 } /* Literal.String.Regex */
.highlight .s1 { color: #e6db74 } /* Literal.String.Single */
.highlight .ss { color: #e6db74 } /* Literal.String.Symbol */
.highlight .bp { color: #f8f8f2 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #a6e22e } /* Name.Function.Magic */
.highlight .vc { color: #f8f8f2 } /* Name.Variable.Class */
.highlight .vg { color: #f8f8f2 } /* Name.Variable.Global */
.highlight .vi { color: #f8f8f2 } /* Name.Variable.Instance */
.highlight .vm { color: #f8f8f2 } /* Name.Variable.Magic */
.highlight .il { color: #ae81ff } /* Literal.Number.Integer.Long */
}
@media (prefers-color-scheme: light) {
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
}
/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * NOTE: Only include this file from external components that require
 * a loose coupling to the stats component.
 */

#ifndef included_stat_weak_inlines_h
#define included_stat_weak_inlines_h
void *vlib_stats_push_heap (void *) __attribute__ ((weak));
void *
vlib_stats_push_heap (void *unused)
{
  return 0;
};

void vlib_stats_pop_heap (void *, void *, u32, int) __attribute__ ((weak));
void
vlib_stats_pop_heap (void *notused, void *notused2, u32 i, int type)
{
};
void vlib_stats_register_error_index (void *, u8 *, u64 *, u64)
  __attribute__ ((weak));
void
vlib_stats_register_error_index (void * notused, u8 * notused2, u64 * notused3, u64 notused4)
{
};

void vlib_stats_pop_heap2 (void *, u32, void *, int) __attribute__ ((weak));
void
vlib_stats_pop_heap2 (void *notused, u32 notused2, void *notused3,
		      int notused4)
{
};

void vlib_stat_segment_lock (void) __attribute__ ((weak));
void
vlib_stat_segment_lock (void)
{
}

void vlib_stat_segment_unlock (void) __attribute__ ((weak));
void
vlib_stat_segment_unlock (void)
{
}

#endif
a> 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
/*
 * 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.
 */
/*
 * node.c: VLIB processing nodes
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <vlib/vlib.h>
#include <vlib/threads.h>

/* Query node given name. */
vlib_node_t *
vlib_get_node_by_name (vlib_main_t * vm, u8 * name)
{
  vlib_node_main_t *nm = &vm->node_main;
  uword *p;
  u8 *key = name;
  if (!clib_mem_is_heap_object (vec_header (key, 0)))
    key = format (0, "%s", key);
  p = hash_get (nm->node_by_name, key);
  if (key != name)
    vec_free (key);
  return p ? vec_elt (nm->nodes, p[0]) : 0;
}

static void
node_set_elog_name (vlib_main_t * vm, uword node_index)
{
  vlib_node_t *n = vlib_get_node (vm, node_index);
  elog_event_type_t *t;

  t = vec_elt_at_index (vm->node_call_elog_event_types, node_index);
  vec_free (t->format);
  t->format = (char *) format (0, "%v-call: %%d%c", n->name, 0);

  t = vec_elt_at_index (vm->node_return_elog_event_types, node_index);
  vec_free (t->format);
  t->format = (char *) format (0, "%v-return: %%d%c", n->name, 0);

  n->name_elog_string = elog_string (&vm->elog_main, "%v%c", n->name, 0);
}

static void
vlib_worker_thread_node_rename (u32 node_index)
{
  int i;
  vlib_main_t *vm;
  vlib_node_t *n;

  if (vec_len (vlib_mains) == 1)
    return;

  vm = vlib_mains[0];
  n = vlib_get_node (vm, node_index);

  ASSERT (vlib_get_thread_index () == 0);
  ASSERT (*vlib_worker_threads->wait_at_barrier == 1);

  for (i = 1; i < vec_len (vlib_mains); i++)
    {
      vlib_main_t *vm_worker = vlib_mains[i];
      vlib_node_t *n_worker = vlib_get_node (vm_worker, node_index);

      n_worker->name = n->name;
      n_worker->name_elog_string = n->name_elog_string;
    }
}

void
vlib_node_rename (vlib_main_t * vm, u32 node_index, char *fmt, ...)
{
  va_list va;
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_t *n = vlib_get_node (vm, node_index);

  va_start (va, fmt);
  hash_unset (nm->node_by_name, n->name);
  vec_free (n->name);
  n->name = va_format (0, fmt, &va);
  va_end (va);
  hash_set (nm->node_by_name, n->name, n->index);

  node_set_elog_name (vm, node_index);

  /* Propagate the change to all worker threads */
  vlib_worker_thread_node_rename (node_index);
}

static void
vlib_node_runtime_update (vlib_main_t * vm, u32 node_index, u32 next_index)
{
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_runtime_t *r, *s;
  vlib_node_t *node, *next_node;
  vlib_next_frame_t *nf;
  vlib_pending_frame_t *pf;
  i32 i, j, n_insert;

  node = vec_elt (nm->nodes, node_index);
  r = vlib_node_get_runtime (vm, node_index);

  n_insert = vec_len (node->next_nodes) - r->n_next_nodes;
  if (n_insert > 0)
    {
      i = r->next_frame_index + r->n_next_nodes;
      vec_insert (nm->next_frames, n_insert, i);

      /* Initialize newly inserted next frames. */
      for (j = 0; j < n_insert; j++)
	vlib_next_frame_init (nm->next_frames + i + j);

      /* Relocate other next frames at higher indices. */
      for (j = 0; j < vec_len (nm->nodes); j++)
	{
	  s = vlib_node_get_runtime (vm, j);
	  if (j != node_index && s->next_frame_index >= i)
	    s->next_frame_index += n_insert;
	}

      /* Pending frames may need to be relocated also. */
      vec_foreach (pf, nm->pending_frames)
      {
	if (pf->next_frame_index != VLIB_PENDING_FRAME_NO_NEXT_FRAME
	    && pf->next_frame_index >= i)
	  pf->next_frame_index += n_insert;
      }
      /* *INDENT-OFF* */
      pool_foreach (pf, nm->suspended_process_frames, ({
	  if (pf->next_frame_index != ~0 && pf->next_frame_index >= i)
	    pf->next_frame_index += n_insert;
      }));
      /* *INDENT-ON* */

      r->n_next_nodes = vec_len (node->next_nodes);
    }

  /* Set frame's node runtime index. */
  next_node = vlib_get_node (vm, node->next_nodes[next_index]);
  nf = nm->next_frames + r->next_frame_index + next_index;
  nf->node_runtime_index = next_node->runtime_index;

  vlib_worker_thread_node_runtime_update ();
}

uword
vlib_node_get_next (vlib_main_t * vm, uword node_index, uword next_node_index)
{
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_t *node;
  uword *p;

  node = vec_elt (nm->nodes, node_index);

  /* Runtime has to be initialized. */
  ASSERT (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED);

  if ((p = hash_get (node->next_slot_by_node, next_node_index)))
    {
      return p[0];
    }

  return (~0);
}

/* Add next node to given node in given slot. */
uword
vlib_node_add_next_with_slot (vlib_main_t * vm,
			      uword node_index,
			      uword next_node_index, uword slot)
{
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_t *node, *next, *old_next;
  u32 old_next_index;
  uword *p;

  ASSERT (vlib_get_thread_index () == 0);

  node = vec_elt (nm->nodes, node_index);
  next = vec_elt (nm->nodes, next_node_index);

  /* Runtime has to be initialized. */
  ASSERT (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED);

  if ((p = hash_get (node->next_slot_by_node, next_node_index)))
    {
      /* Next already exists: slot must match. */
      if (slot != ~0)
	ASSERT (slot == p[0]);
      return p[0];
    }

  vlib_worker_thread_barrier_sync (vm);

  if (slot == ~0)
    slot = vec_len (node->next_nodes);

  vec_validate_init_empty (node->next_nodes, slot, ~0);
  vec_validate (node->n_vectors_by_next_node, slot);

  if ((old_next_index = node->next_nodes[slot]) != ~0u)
    {
      hash_unset (node->next_slot_by_node, old_next_index);
      old_next = vlib_get_node (vm, old_next_index);
      old_next->prev_node_bitmap =
	clib_bitmap_andnoti (old_next->prev_node_bitmap, node_index);
    }

  node->next_nodes[slot] = next_node_index;
  hash_set (node->next_slot_by_node, next_node_index, slot);

  vlib_node_runtime_update (vm, node_index, slot);

  next->prev_node_bitmap = clib_bitmap_ori (next->prev_node_bitmap,
					    node_index);

  /* Siblings all get same node structure. */
  {
    uword sib_node_index, sib_slot;
    vlib_node_t *sib_node;
    /* *INDENT-OFF* */
    clib_bitmap_foreach (sib_node_index, node->sibling_bitmap, ({
      sib_node = vec_elt (nm->nodes, sib_node_index);
      if (sib_node != node)
	{
	  sib_slot = vlib_node_add_next_with_slot (vm, sib_node_index, next_node_index, slot);
	  ASSERT (sib_slot == slot);
	}
    }));
    /* *INDENT-ON* */
  }

  vlib_worker_thread_barrier_release (vm);
  return slot;
}

/* Add named next node to given node in given slot. */
uword
vlib_node_add_named_next_with_slot (vlib_main_t * vm,
				    uword node, char *name, uword slot)
{
  vlib_node_main_t *nm;
  vlib_node_t *n, *n_next;

  nm = &vm->node_main;
  n = vlib_get_node (vm, node);

  n_next = vlib_get_node_by_name (vm, (u8 *) name);
  if (!n_next)
    {
      if (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED)
	return ~0;

      if (slot == ~0)
	slot = clib_max (vec_len (n->next_node_names),
			 vec_len (n->next_nodes));
      vec_validate (n->next_node_names, slot);
      n->next_node_names[slot] = name;
      return slot;
    }

  return vlib_node_add_next_with_slot (vm, node, n_next->index, slot);
}

static void
node_elog_init (vlib_main_t * vm, uword ni)
{
  elog_event_type_t t;

  clib_memset (&t, 0, sizeof (t));

  /* 2 event types for this node: one when node function is called.
     One when it returns. */
  vec_validate (vm->node_call_elog_event_types, ni);
  vm->node_call_elog_event_types[ni] = t;

  vec_validate (vm->node_return_elog_event_types, ni);
  vm->node_return_elog_event_types[ni] = t;

  node_set_elog_name (vm, ni);
}

#ifdef CLIB_UNIX
#define STACK_ALIGN (clib_mem_get_page_size())
#else
#define STACK_ALIGN CLIB_CACHE_LINE_BYTES
#endif

static void
register_node (vlib_main_t * vm, vlib_node_registration_t * r)
{
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_t *n;
  u32 page_size = clib_mem_get_page_size ();
  int i;

  if (CLIB_DEBUG > 0)
    {
      /* Default (0) type should match INTERNAL. */
      vlib_node_t zero = { 0 };
      ASSERT (VLIB_NODE_TYPE_INTERNAL == zero.type);
    }

  if (r->node_fn_registrations)
    {
      vlib_node_fn_registration_t *fnr = r->node_fn_registrations;
      int priority = -1;

      /* to avoid confusion, please remove ".function " statiement from
         CLIB_NODE_REGISTRATION() if using function function candidates */
      ASSERT (r->function == 0);

      while (fnr)
	{
	  if (fnr->priority > priority)
	    {
	      priority = fnr->priority;
	      r->function = fnr->function;
	    }
	  fnr = fnr->next_registration;
	}
    }

  ASSERT (r->function != 0);

  n = clib_mem_alloc_no_fail (sizeof (n[0]));
  clib_memset (n, 0, sizeof (n[0]));
  n->index = vec_len (nm->nodes);
  n->node_fn_registrations = r->node_fn_registrations;
  n->protocol_hint = r->protocol_hint;

  vec_add1 (nm->nodes, n);

  /* Name is always a vector so it can be formatted with %v. */
  if (clib_mem_is_heap_object (vec_header (r->name, 0)))
    n->name = vec_dup ((u8 *) r->name);
  else
    n->name = format (0, "%s", r->name);

  if (!nm->node_by_name)
    nm->node_by_name = hash_create_vec ( /* size */ 32,
					sizeof (n->name[0]), sizeof (uword));

  /* Node names must be unique. */
  {
    vlib_node_t *o = vlib_get_node_by_name (vm, n->name);
    if (o)
      clib_error ("more than one node named `%v'", n->name);
  }

  hash_set (nm->node_by_name, n->name, n->index);

  r->index = n->index;		/* save index in registration */
  n->function = r->function;

  /* Node index of next sibling will be filled in by vlib_node_main_init. */
  n->sibling_of = r->sibling_of;
  if (r->sibling_of && r->n_next_nodes > 0)
    clib_error ("sibling node should not have any next nodes `%v'", n->name);

  if (r->type == VLIB_NODE_TYPE_INTERNAL)
    ASSERT (r->vector_size > 0);

#define _(f) n->f = r->f

  _(type);
  _(flags);
  _(state);
  _(scalar_size);
  _(vector_size);
  _(format_buffer);
  _(unformat_buffer);
  _(format_trace);
  _(validate_frame);

  /* Register error counters. */
  vlib_register_errors (vm, n->index, r->n_errors, r->error_strings);
  node_elog_init (vm, n->index);

  _(runtime_data_bytes);
  if (r->runtime_data_bytes > 0)
    {
      vec_resize (n->runtime_data, r->runtime_data_bytes);
      if (r->runtime_data)
	clib_memcpy (n->runtime_data, r->runtime_data, r->runtime_data_bytes);
    }

  vec_resize (n->next_node_names, r->n_next_nodes);
  for (i = 0; i < r->n_next_nodes; i++)
    n->next_node_names[i] = r->next_nodes[i];

  vec_validate_init_empty (n->next_nodes, r->n_next_nodes - 1, ~0);
  vec_validate (n->n_vectors_by_next_node, r->n_next_nodes - 1);

  n->owner_node_index = n->owner_next_index = ~0;

  /* Initialize node runtime. */
  {
    vlib_node_runtime_t *rt;
    u32 i;

    if (n->type == VLIB_NODE_TYPE_PROCESS)
      {
	vlib_process_t *p;
	uword log2_n_stack_bytes;

	log2_n_stack_bytes = clib_max (r->process_log2_n_stack_bytes, 15);

#ifdef CLIB_UNIX
	/*
	 * Bump the stack size if running over a kernel with a large page size,
	 * and the stack isn't any too big to begin with. Otherwise, we'll
	 * trip over the stack guard page for sure.
	 */
	if ((page_size > (4 << 10)) && log2_n_stack_bytes < 19)
	  {
	    if ((1 << log2_n_stack_bytes) <= page_size)
	      log2_n_stack_bytes = min_log2 (page_size) + 1;
	    else
	      log2_n_stack_bytes++;
	  }
#endif

	p = clib_mem_alloc_aligned_at_offset
	  (sizeof (p[0]) + (1 << log2_n_stack_bytes),
	   STACK_ALIGN, STRUCT_OFFSET_OF (vlib_process_t, stack),
	   0 /* no, don't call os_out_of_memory */ );
	if (p == 0)
	  clib_panic ("failed to allocate process stack (%d bytes)",
		      1 << log2_n_stack_bytes);

	clib_memset (p, 0, sizeof (p[0]));
	p->log2_n_stack_bytes = log2_n_stack_bytes;

	/* Process node's runtime index is really index into process
	   pointer vector. */
	n->runtime_index = vec_len (nm->processes);

	vec_add1 (nm->processes, p);

	/* Paint first stack word with magic number so we can at least
	   detect process stack overruns. */
	p->stack[0] = VLIB_PROCESS_STACK_MAGIC;

	/* Node runtime is stored inside of process. */
	rt = &p->node_runtime;

#ifdef CLIB_UNIX
	/*
	 * Disallow writes to the bottom page of the stack, to
	 * catch stack overflows.
	 */
	if (mprotect (p->stack, page_size, PROT_READ) < 0)
	  clib_unix_warning ("process stack");
#endif

      }
    else
      {
	vec_add2_aligned (nm->nodes_by_type[n->type], rt, 1,
			  /* align */ CLIB_CACHE_LINE_BYTES);
	n->runtime_index = rt - nm->nodes_by_type[n->type];
      }

    if (n->type == VLIB_NODE_TYPE_INPUT)
      nm->input_node_counts_by_state[n->state] += 1;

    rt->function = n->function;
    rt->flags = n->flags;
    rt->state = n->state;
    rt->node_index = n->index;

    rt->n_next_nodes = r->n_next_nodes;
    rt->next_frame_index = vec_len (nm->next_frames);

    vec_resize (nm->next_frames, rt->n_next_nodes);
    for (i = 0; i < rt->n_next_nodes; i++)
      vlib_next_frame_init (nm->next_frames + rt->next_frame_index + i);

    vec_resize (rt->errors, r->n_errors);
    for (i = 0; i < vec_len (rt->errors); i++)
      rt->errors[i] = n->error_heap_index + i;

    STATIC_ASSERT_SIZEOF (vlib_node_runtime_t, 128);
    ASSERT (vec_len (n->runtime_data) <= VLIB_NODE_RUNTIME_DATA_SIZE);

    if (vec_len (n->runtime_data) > 0)
      clib_memcpy (rt->runtime_data, n->runtime_data,
		   vec_len (n->runtime_data));

    vec_free (n->runtime_data);
  }
}

/* Register new packet processing node. */
u32
vlib_register_node (vlib_main_t * vm, vlib_node_registration_t * r)
{
  register_node (vm, r);
  return r->index;
}

static uword
null_node_fn (vlib_main_t * vm,
	      vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u16 n_vectors = frame->n_vectors;

  vlib_node_increment_counter (vm, node->node_index, 0, n_vectors);
  vlib_buffer_free (vm, vlib_frame_vector_args (frame), n_vectors);
  vlib_frame_free (vm, node, frame);

  return n_vectors;
}

void
vlib_register_all_static_nodes (vlib_main_t * vm)
{
  vlib_node_registration_t *r;

  static char *null_node_error_strings[] = {
    "blackholed packets",
  };

  static vlib_node_registration_t null_node_reg = {
    .function = null_node_fn,
    .vector_size = sizeof (u32),
    .name = "null-node",
    .n_errors = 1,
    .error_strings = null_node_error_strings,
  };

  /* make sure that node index 0 is not used by
     real node */
  register_node (vm, &null_node_reg);

  r = vm->node_main.node_registrations;
  while (r)
    {
      register_node (vm, r);
      r = r->next_registration;
    }
}

void
vlib_node_get_nodes (vlib_main_t * vm, u32 max_threads, int include_stats,
		     int barrier_sync, vlib_node_t **** node_dupsp,
		     vlib_main_t *** stat_vmsp)
{
  vlib_node_main_t *nm = &vm->node_main;
  vlib_node_t *n;
  vlib_node_t ***node_dups = *node_dupsp;
  vlib_node_t **nodes;
  vlib_main_t **stat_vms = *stat_vmsp;
  vlib_main_t *stat_vm;
  uword i, j;
  u32 threads_to_serialize;

  if (vec_len (stat_vms) == 0)
    {
      for (i = 0; i < vec_len (vlib_mains); i++)
	{
	  stat_vm = vlib_mains[i];
	  if (stat_vm)
	    vec_add1 (stat_vms, stat_vm);
	}
    }

  threads_to_serialize = clib_min (max_threads, vec_len (stat_vms));

  vec_validate (node_dups, threads_to_serialize - 1);

  /*
   * Barrier sync across stats scraping.
   * Otherwise, the counts will be grossly inaccurate.
   */
  if (barrier_sync)
    vlib_worker_thread_barrier_sync (vm);

  for (j = 0; j < threads_to_serialize; j++)
    {
      stat_vm = stat_vms[j];
      nm = &stat_vm->node_main;

      if (include_stats)
	{
	  for (i = 0; i < vec_len (nm->nodes); i++)
	    {
	      n = nm->nodes[i];
	      vlib_node_sync_stats (stat_vm, n);
	    }
	}

      nodes = node_dups[j];
      vec_validate (nodes, vec_len (nm->nodes) - 1);
      clib_memcpy (nodes, nm->nodes, vec_len (nm->nodes) * sizeof (nodes[0]));
      node_dups[j] = nodes;
    }

  if (barrier_sync)
    vlib_worker_thread_barrier_release (vm);

  *node_dupsp = node_dups;
  *stat_vmsp = stat_vms;
}

clib_error_t *
vlib_node_main_init (vlib_main_t * vm)
{
  vlib_node_main_t *nm = &vm->node_main;
  clib_error_t *error = 0;
  vlib_node_t *n;
  uword ni;

  nm->frame_sizes = vec_new (vlib_frame_size_t, 1);
#ifdef VLIB_SUPPORTS_ARBITRARY_SCALAR_SIZES
  nm->frame_size_hash = hash_create (0, sizeof (uword));
#endif
  nm->flags |= VLIB_NODE_MAIN_RUNTIME_STARTED;

  /* Generate sibling relationships */
  {
    vlib_node_t *n, *sib;
    uword si;

    for (ni = 0; ni < vec_len (nm->nodes); ni++)
      {
	n = vec_elt (nm->nodes, ni);

	if (!n->sibling_of)
	  continue;

	sib = vlib_get_node_by_name (vm, (u8 *) n->sibling_of);
	if (!sib)
	  {
	    error = clib_error_create ("sibling `%s' not found for node `%v'",
				       n->sibling_of, n->name);
	    goto done;
	  }

        /* *INDENT-OFF* */
	clib_bitmap_foreach (si, sib->sibling_bitmap, ({
	      vlib_node_t * m = vec_elt (nm->nodes, si);

	      /* Connect all of sibling's siblings to us. */
	      m->sibling_bitmap = clib_bitmap_ori (m->sibling_bitmap, n->index);

	      /* Connect us to all of sibling's siblings. */
	      n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, si);
	    }));
        /* *INDENT-ON* */

	/* Connect sibling to us. */
	sib->sibling_bitmap = clib_bitmap_ori (sib->sibling_bitmap, n->index);

	/* Connect us to sibling. */
	n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, sib->index);
      }
  }

  /* Resolve next names into next indices. */
  for (ni = 0; ni < vec_len (nm->nodes); ni++)
    {
      uword i;

      n = vec_elt (nm->nodes, ni);

      for (i = 0; i < vec_len (n->next_node_names); i++)
	{
	  char *a = n->next_node_names[i];

	  if (!a)
	    continue;

	  if (~0 == vlib_node_add_named_next_with_slot (vm, n->index, a, i))
	    {
	      error = clib_error_create
		("node `%v' refers to unknown node `%s'", n->name, a);
	      goto done;
	    }
	}

      vec_free (n->next_node_names);
    }

  /* Set previous node pointers. */
  for (ni = 0; ni < vec_len (nm->nodes); ni++)
    {
      vlib_node_t *n_next;
      uword i;

      n = vec_elt (nm->nodes, ni);

      for (i = 0; i < vec_len (n->next_nodes); i++)
	{
	  if (n->next_nodes[i] >= vec_len (nm->nodes))
	    continue;

	  n_next = vec_elt (nm->nodes, n->next_nodes[i]);
	  n_next->prev_node_bitmap =
	    clib_bitmap_ori (n_next->prev_node_bitmap, n->index);
	}
    }

  {
    vlib_next_frame_t *nf;
    vlib_node_runtime_t *r;
    vlib_node_t *next;
    uword i;

    vec_foreach (r, nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL])
    {
      if (r->n_next_nodes == 0)
	continue;

      n = vlib_get_node (vm, r->node_index);
      nf = vec_elt_at_index (nm->next_frames, r->next_frame_index);

      for (i = 0; i < vec_len (n->next_nodes); i++)
	{
	  next = vlib_get_node (vm, n->next_nodes[i]);

	  /* Validate node runtime indices are correctly initialized. */
	  ASSERT (nf[i].node_runtime_index == next->runtime_index);

	  nf[i].flags = 0;
	  if (next->flags & VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH)
	    nf[i].flags |= VLIB_FRAME_NO_FREE_AFTER_DISPATCH;
	}
    }
  }

done:
  return error;
}

u32
vlib_process_create (vlib_main_t * vm, char *name,
		     vlib_node_function_t * f, u32 log2_n_stack_bytes)
{
  vlib_node_registration_t r;
  vlib_node_t *n;

  memset (&r, 0, sizeof (r));

  r.name = (char *) format (0, "%s", name, 0);
  r.function = f;
  r.process_log2_n_stack_bytes = log2_n_stack_bytes;
  r.type = VLIB_NODE_TYPE_PROCESS;

  vlib_worker_thread_barrier_sync (vm);

  vlib_register_node (vm, &r);
  vec_free (r.name);

  vlib_worker_thread_node_runtime_update ();
  vlib_worker_thread_barrier_release (vm);

  n = vlib_get_node (vm, r.index);
  vlib_start_process (vm, n->runtime_index);

  return (r.index);
}

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