2 * Copyright (c) 2015 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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * node.c: VLIB processing nodes
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vlib/vlib.h>
41 #include <vlib/threads.h>
43 /* Query node given name. */
44 vlib_node_t * vlib_get_node_by_name (vlib_main_t * vm, u8 * name)
46 vlib_node_main_t * nm = &vm->node_main;
49 if (! clib_mem_is_heap_object (key))
50 key = format (0, "%s", key);
51 p = hash_get (nm->node_by_name, key);
54 return p ? vec_elt (nm->nodes, p[0]) : 0;
57 static void node_set_elog_name (vlib_main_t * vm, uword node_index)
59 vlib_node_t * n = vlib_get_node (vm, node_index);
60 elog_event_type_t * t;
62 t = vec_elt_at_index (vm->node_call_elog_event_types, node_index);
64 t->format = (char *) format (0, "%v-call: %%d%c", n->name, 0);
66 t = vec_elt_at_index (vm->node_return_elog_event_types, node_index);
68 t->format = (char *) format (0, "%v-return: %%d%c", n->name, 0);
70 n->name_elog_string = elog_string (&vm->elog_main, "%v%c", n->name,0);
73 void vlib_node_rename (vlib_main_t * vm, u32 node_index, char * fmt, ...)
76 vlib_node_main_t * nm = &vm->node_main;
77 vlib_node_t * n = vlib_get_node (vm, node_index);
80 hash_unset (nm->node_by_name, n->name);
82 n->name = va_format (0, fmt, &va);
84 hash_set (nm->node_by_name, n->name, n->index);
86 node_set_elog_name (vm, node_index);
90 vlib_node_runtime_update (vlib_main_t * vm,
94 vlib_node_main_t * nm = &vm->node_main;
95 vlib_node_runtime_t * r, * s;
96 vlib_node_t * node, * next_node;
97 vlib_next_frame_t * nf;
98 vlib_pending_frame_t * pf;
101 ASSERT(os_get_cpu_number() == 0);
103 vlib_worker_thread_barrier_sync(vm);
105 node = vec_elt (nm->nodes, node_index);
106 r = vlib_node_get_runtime (vm, node_index);
108 n_insert = vec_len (node->next_nodes) - r->n_next_nodes;
111 i = r->next_frame_index + r->n_next_nodes;
112 vec_insert (nm->next_frames, n_insert, i);
114 /* Initialize newly inserted next frames. */
115 for (j = 0; j < n_insert; j++)
116 vlib_next_frame_init (nm->next_frames + i + j);
118 /* Relocate other next frames at higher indices. */
119 for (j = 0; j < vec_len (nm->nodes); j++)
121 s = vlib_node_get_runtime (vm, j);
123 && s->next_frame_index >= i)
124 s->next_frame_index += n_insert;
127 /* Pending frames may need to be relocated also. */
128 vec_foreach (pf, nm->pending_frames)
130 if (pf->next_frame_index != VLIB_PENDING_FRAME_NO_NEXT_FRAME
131 && pf->next_frame_index >= i)
132 pf->next_frame_index += n_insert;
134 pool_foreach (pf, nm->suspended_process_frames, ({
135 if (pf->next_frame_index != ~0 && pf->next_frame_index >= i)
136 pf->next_frame_index += n_insert;
139 r->n_next_nodes = vec_len (node->next_nodes);
142 /* Set frame's node runtime index. */
143 next_node = vlib_get_node (vm, node->next_nodes[next_index]);
144 nf = nm->next_frames + r->next_frame_index + next_index;
145 nf->node_runtime_index = next_node->runtime_index;
147 vlib_worker_thread_node_runtime_update();
149 vlib_worker_thread_barrier_release(vm);
152 /* Add next node to given node in given slot. */
154 vlib_node_add_next_with_slot (vlib_main_t * vm,
156 uword next_node_index,
159 vlib_node_main_t * nm = &vm->node_main;
160 vlib_node_t * node, * next;
163 node = vec_elt (nm->nodes, node_index);
164 next = vec_elt (nm->nodes, next_node_index);
166 /* Fill in static next nodes if runtime has yet to be initialized. */
167 if (slot == ~0 && ! (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED))
170 for (i = 0; i < vec_len (node->next_node_names); i++)
172 char * a = node->next_node_names[i];
174 vlib_node_add_named_next_with_slot (vm, node->index, a, i);
178 if ((p = hash_get (node->next_slot_by_node, next_node_index)))
180 /* Next already exists: use it if slot not specified or the same. */
181 if ((slot == ~0) || (slot == p[0]))
186 slot = vec_len (node->next_nodes);
188 vec_validate_init_empty (node->next_nodes, slot, ~0);
189 vec_validate (node->n_vectors_by_next_node, slot);
191 node->next_nodes[slot] = next_node_index;
192 if (!p) hash_set (node->next_slot_by_node, next_node_index, slot);
194 vlib_node_runtime_update (vm, node_index, slot);
196 next->prev_node_bitmap = clib_bitmap_ori (next->prev_node_bitmap,
199 /* Siblings all get same node structure. */
201 uword sib_node_index, sib_slot;
202 vlib_node_t * sib_node;
203 clib_bitmap_foreach (sib_node_index, node->sibling_bitmap, ({
204 sib_node = vec_elt (nm->nodes, sib_node_index);
205 if (sib_node != node)
207 sib_slot = vlib_node_add_next_with_slot (vm, sib_node_index, next_node_index, slot);
208 ASSERT (sib_slot == slot);
216 /* Add named next node to given node in given slot. */
218 vlib_node_add_named_next_with_slot (vlib_main_t * vm,
223 vlib_node_main_t * nm;
224 vlib_node_t * n, * n_next;
227 n = vlib_get_node (vm, node);
229 n_next = vlib_get_node_by_name (vm, (u8 *) name);
232 if (nm->flags & VLIB_NODE_MAIN_RUNTIME_STARTED)
236 slot = clib_max (vec_len (n->next_node_names),
237 vec_len (n->next_nodes));
238 vec_validate (n->next_node_names, slot);
239 n->next_node_names[slot] = name;
243 return vlib_node_add_next_with_slot (vm, node, n_next->index, slot);
246 static void node_elog_init (vlib_main_t * vm, uword ni)
250 memset (&t, 0, sizeof (t));
252 /* 2 event types for this node: one when node function is called.
253 One when it returns. */
254 vec_validate (vm->node_call_elog_event_types, ni);
255 vm->node_call_elog_event_types[ni] = t;
257 vec_validate (vm->node_return_elog_event_types, ni);
258 vm->node_return_elog_event_types[ni] = t;
260 node_set_elog_name (vm, ni);
264 #define STACK_ALIGN (clib_mem_get_page_size())
266 #define STACK_ALIGN CLIB_CACHE_LINE_BYTES
269 static void register_node (vlib_main_t * vm,
270 vlib_node_registration_t * r)
272 vlib_node_main_t * nm = &vm->node_main;
274 u32 page_size = clib_mem_get_page_size();
279 /* Default (0) type should match INTERNAL. */
280 vlib_node_t zero = {0};
281 ASSERT (VLIB_NODE_TYPE_INTERNAL == zero.type);
284 ASSERT (r->function != 0);
286 n = clib_mem_alloc_no_fail (sizeof (n[0]));
287 memset (n, 0, sizeof (n[0]));
288 n->index = vec_len (nm->nodes);
290 vec_add1 (nm->nodes, n);
292 /* Name is always a vector so it can be formatted with %v. */
293 if (clib_mem_is_heap_object (vec_header (r->name, 0)))
294 n->name = vec_dup ((u8 *) r->name);
296 n->name = format (0, "%s", r->name);
298 if (! nm->node_by_name)
299 nm->node_by_name = hash_create_vec (/* size */ 32,
303 /* Node names must be unique. */
305 vlib_node_t * o = vlib_get_node_by_name (vm, n->name);
307 clib_error ("more than one node named `%v'", n->name);
310 hash_set (nm->node_by_name, n->name, n->index);
312 r->index = n->index; /* save index in registration */
313 n->function = r->function;
315 /* Node index of next sibling will be filled in by vlib_node_main_init. */
316 n->sibling_of = r->sibling_of;
318 if (r->type == VLIB_NODE_TYPE_INTERNAL)
319 ASSERT (r->vector_size > 0);
321 #define _(f) n->f = r->f
333 /* Register error counters. */
334 vlib_register_errors (vm, n->index, r->n_errors, r->error_strings);
335 node_elog_init (vm, n->index);
337 _ (runtime_data_bytes);
338 if (r->runtime_data_bytes > 0)
340 vec_resize (n->runtime_data, r->runtime_data_bytes);
342 clib_memcpy (n->runtime_data, r->runtime_data, r->runtime_data_bytes);
345 vec_resize (n->next_node_names, r->n_next_nodes);
346 for (i = 0; i < r->n_next_nodes; i++)
347 n->next_node_names[i] = r->next_nodes[i];
349 vec_validate_init_empty (n->next_nodes, r->n_next_nodes - 1, ~0);
350 vec_validate (n->n_vectors_by_next_node, r->n_next_nodes - 1);
352 n->owner_node_index = n->owner_next_index = ~0;
354 /* Initialize node runtime. */
356 vlib_node_runtime_t * rt;
359 if (n->type == VLIB_NODE_TYPE_PROCESS)
362 uword log2_n_stack_bytes;
364 log2_n_stack_bytes = clib_max (r->process_log2_n_stack_bytes, 15);
368 * Bump the stack size if running over a kernel with a large page size,
369 * and the stack isn't any too big to begin with. Otherwise, we'll
370 * trip over the stack guard page for sure.
372 if ((page_size > (4<<10)) && log2_n_stack_bytes < 19)
374 if ((1<<log2_n_stack_bytes) <= page_size)
375 log2_n_stack_bytes = min_log2 (page_size) + 1;
377 log2_n_stack_bytes++;
381 p = clib_mem_alloc_aligned_at_offset
382 (sizeof (p[0]) + (1 << log2_n_stack_bytes),
383 STACK_ALIGN, STRUCT_OFFSET_OF (vlib_process_t, stack));
385 clib_panic ("failed to allocate process stack (%d bytes)", 1<<log2_n_stack_bytes);
387 memset (p, 0, sizeof (p[0]));
388 p->log2_n_stack_bytes = log2_n_stack_bytes;
390 /* Process node's runtime index is really index into process
392 n->runtime_index = vec_len (nm->processes);
394 vec_add1 (nm->processes, p);
396 /* Paint first stack word with magic number so we can at least
397 detect process stack overruns. */
398 p->stack[0] = VLIB_PROCESS_STACK_MAGIC;
400 /* Node runtime is stored inside of process. */
401 rt = &p->node_runtime;
405 * Disallow writes to the bottom page of the stack, to
406 * catch stack overflows.
408 if (mprotect (p->stack, page_size, PROT_READ) < 0)
409 clib_unix_warning ("process stack");
415 vec_add2_aligned (nm->nodes_by_type[n->type], rt, 1,
416 /* align */ CLIB_CACHE_LINE_BYTES);
417 n->runtime_index = rt - nm->nodes_by_type[n->type];
420 if (n->type == VLIB_NODE_TYPE_INPUT)
421 nm->input_node_counts_by_state[n->state] += 1;
423 rt->function = n->function;
424 rt->flags = n->flags;
425 rt->state = n->state;
426 rt->node_index = n->index;
428 rt->n_next_nodes = r->n_next_nodes;
429 rt->next_frame_index = vec_len (nm->next_frames);
431 vec_resize (nm->next_frames, rt->n_next_nodes);
432 for (i = 0; i < rt->n_next_nodes; i++)
433 vlib_next_frame_init (nm->next_frames + rt->next_frame_index + i);
435 vec_resize (rt->errors, r->n_errors);
436 for (i = 0; i < vec_len (rt->errors); i++)
437 rt->errors[i] = vlib_error_set (n->index, i);
439 ASSERT (vec_len (n->runtime_data) <= sizeof (rt->runtime_data));
440 if (vec_len (n->runtime_data) > 0)
441 clib_memcpy (rt->runtime_data, n->runtime_data, vec_len (n->runtime_data));
443 vec_free (n->runtime_data);
447 /* Register new packet processing node. */
448 u32 vlib_register_node (vlib_main_t * vm, vlib_node_registration_t * r)
450 register_node (vm, r);
454 void vlib_register_all_static_nodes (vlib_main_t * vm)
456 vlib_node_registration_t * r;
458 r = vm->node_main.node_registrations;
460 register_node (vm, r);
461 r = r->next_registration;
466 vlib_node_main_init (vlib_main_t * vm)
468 vlib_node_main_t * nm = &vm->node_main;
469 clib_error_t * error = 0;
473 nm->flags |= VLIB_NODE_MAIN_RUNTIME_STARTED;
475 /* Resolve next names into next indices. */
476 for (ni = 0; ni < vec_len (nm->nodes); ni++)
480 n = vec_elt (nm->nodes, ni);
482 for (i = 0; i < vec_len (n->next_node_names); i++)
484 char * a = n->next_node_names[i];
489 if (~0 == vlib_node_add_named_next_with_slot (vm, n->index, a, i))
491 error = clib_error_create
492 ("node `%v' refers to unknown node `%s'", n->name, a);
497 vec_free (n->next_node_names);
500 /* Set previous node pointers. */
501 for (ni = 0; ni < vec_len (nm->nodes); ni++)
503 vlib_node_t * n_next;
506 n = vec_elt (nm->nodes, ni);
508 for (i = 0; i < vec_len (n->next_nodes); i++)
510 if (n->next_nodes[i] >= vec_len (nm->nodes))
513 n_next = vec_elt (nm->nodes, n->next_nodes[i]);
514 n_next->prev_node_bitmap =
515 clib_bitmap_ori (n_next->prev_node_bitmap, n->index);
520 vlib_next_frame_t * nf;
521 vlib_node_runtime_t * r;
525 vec_foreach (r, nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL])
527 if (r->n_next_nodes == 0)
530 n = vlib_get_node (vm, r->node_index);
531 nf = vec_elt_at_index (nm->next_frames, r->next_frame_index);
533 for (i = 0; i < vec_len (n->next_nodes); i++)
535 next = vlib_get_node (vm, n->next_nodes[i]);
537 /* Validate node runtime indices are correctly initialized. */
538 ASSERT (nf[i].node_runtime_index == next->runtime_index);
541 if (next->flags & VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH)
542 nf[i].flags |= VLIB_FRAME_NO_FREE_AFTER_DISPATCH;
547 /* Generate node sibling relationships. */
549 vlib_node_t * n, * sib;
552 for (ni = 0; ni < vec_len (nm->nodes); ni++)
554 n = vec_elt (nm->nodes, ni);
559 sib = vlib_get_node_by_name (vm, (u8 *) n->sibling_of);
561 clib_error ("sibling `%s' not found for node `%v'", n->sibling_of, n->name);
563 clib_bitmap_foreach (si, sib->sibling_bitmap, ({
564 vlib_node_t * m = vec_elt (nm->nodes, si);
566 /* Connect all of sibling's siblings to us. */
567 m->sibling_bitmap = clib_bitmap_ori (m->sibling_bitmap, n->index);
569 /* Connect us to all of sibling's siblings. */
570 n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, si);
573 /* Connect sibling to us. */
574 sib->sibling_bitmap = clib_bitmap_ori (sib->sibling_bitmap, n->index);
576 /* Connect us to sibling. */
577 n->sibling_bitmap = clib_bitmap_ori (n->sibling_bitmap, sib->index);