FD.io VPP  v18.07-rc0-415-g6c78436
Vector Packet Processing
mpls_lookup.c
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1 /*
2  * mpls_lookup.c: MPLS lookup
3  *
4  * Copyright (c) 2012-2014 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/mpls/mpls_lookup.h>
21 #include <vnet/fib/mpls_fib.h>
23 #include <vnet/dpo/replicate_dpo.h>
24 
25 /**
26  * Static MPLS VLIB forwarding node
27  */
29 
30 /**
31  * The arc/edge from the MPLS lookup node to the MPLS replicate node
32  */
34 
35 typedef struct {
42 
43 static u8 *
44 format_mpls_lookup_trace (u8 * s, va_list * args)
45 {
46  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
47  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
48  mpls_lookup_trace_t * t = va_arg (*args, mpls_lookup_trace_t *);
49 
50  s = format (s, "MPLS: next [%d], lookup fib index %d, LB index %d hash %x "
51  "label %d eos %d",
52  t->next_index, t->lfib_index, t->lb_index, t->hash,
54  clib_net_to_host_u32(t->label_net_byte_order)),
56  clib_net_to_host_u32(t->label_net_byte_order)));
57  return s;
58 }
59 
60 static inline uword
62  vlib_node_runtime_t * node,
63  vlib_frame_t * from_frame)
64 {
66  u32 n_left_from, next_index, * from, * to_next;
67  mpls_main_t * mm = &mpls_main;
68  u32 thread_index = vlib_get_thread_index();
69 
70  from = vlib_frame_vector_args (from_frame);
71  n_left_from = from_frame->n_vectors;
72  next_index = node->cached_next_index;
73 
74  while (n_left_from > 0)
75  {
76  u32 n_left_to_next;
77 
78  vlib_get_next_frame (vm, node, next_index,
79  to_next, n_left_to_next);
80 
81  while (n_left_from >= 8 && n_left_to_next >= 4)
82  {
83  u32 lbi0, next0, lfib_index0, bi0, hash_c0;
84  const mpls_unicast_header_t * h0;
85  const load_balance_t *lb0;
86  const dpo_id_t *dpo0;
87  vlib_buffer_t * b0;
88  u32 lbi1, next1, lfib_index1, bi1, hash_c1;
89  const mpls_unicast_header_t * h1;
90  const load_balance_t *lb1;
91  const dpo_id_t *dpo1;
92  vlib_buffer_t * b1;
93  u32 lbi2, next2, lfib_index2, bi2, hash_c2;
94  const mpls_unicast_header_t * h2;
95  const load_balance_t *lb2;
96  const dpo_id_t *dpo2;
97  vlib_buffer_t * b2;
98  u32 lbi3, next3, lfib_index3, bi3, hash_c3;
99  const mpls_unicast_header_t * h3;
100  const load_balance_t *lb3;
101  const dpo_id_t *dpo3;
102  vlib_buffer_t * b3;
103 
104  /* Prefetch next iteration. */
105  {
106  vlib_buffer_t *p4, *p5, *p6, *p7;
107 
108  p4 = vlib_get_buffer (vm, from[4]);
109  p5 = vlib_get_buffer (vm, from[5]);
110  p6 = vlib_get_buffer (vm, from[6]);
111  p7 = vlib_get_buffer (vm, from[7]);
112 
113  vlib_prefetch_buffer_header (p4, STORE);
114  vlib_prefetch_buffer_header (p5, STORE);
115  vlib_prefetch_buffer_header (p6, STORE);
116  vlib_prefetch_buffer_header (p7, STORE);
117 
118  CLIB_PREFETCH (p4->data, sizeof (h0[0]), LOAD);
119  CLIB_PREFETCH (p5->data, sizeof (h0[0]), LOAD);
120  CLIB_PREFETCH (p6->data, sizeof (h0[0]), LOAD);
121  CLIB_PREFETCH (p7->data, sizeof (h0[0]), LOAD);
122  }
123 
124  bi0 = to_next[0] = from[0];
125  bi1 = to_next[1] = from[1];
126  bi2 = to_next[2] = from[2];
127  bi3 = to_next[3] = from[3];
128 
129  from += 4;
130  n_left_from -= 4;
131  to_next += 4;
132  n_left_to_next -= 4;
133 
134  b0 = vlib_get_buffer (vm, bi0);
135  b1 = vlib_get_buffer (vm, bi1);
136  b2 = vlib_get_buffer (vm, bi2);
137  b3 = vlib_get_buffer (vm, bi3);
138  h0 = vlib_buffer_get_current (b0);
139  h1 = vlib_buffer_get_current (b1);
140  h2 = vlib_buffer_get_current (b2);
141  h3 = vlib_buffer_get_current (b3);
142 
143  lfib_index0 = vec_elt(mm->fib_index_by_sw_if_index,
144  vnet_buffer(b0)->sw_if_index[VLIB_RX]);
145  lfib_index1 = vec_elt(mm->fib_index_by_sw_if_index,
146  vnet_buffer(b1)->sw_if_index[VLIB_RX]);
147  lfib_index2 = vec_elt(mm->fib_index_by_sw_if_index,
148  vnet_buffer(b2)->sw_if_index[VLIB_RX]);
149  lfib_index3 = vec_elt(mm->fib_index_by_sw_if_index,
150  vnet_buffer(b3)->sw_if_index[VLIB_RX]);
151 
152  lbi0 = mpls_fib_table_forwarding_lookup (lfib_index0, h0);
153  lbi1 = mpls_fib_table_forwarding_lookup (lfib_index1, h1);
154  lbi2 = mpls_fib_table_forwarding_lookup (lfib_index2, h2);
155  lbi3 = mpls_fib_table_forwarding_lookup (lfib_index3, h3);
156 
157  hash_c0 = vnet_buffer(b0)->ip.flow_hash = 0;
158  hash_c1 = vnet_buffer(b1)->ip.flow_hash = 0;
159  hash_c2 = vnet_buffer(b2)->ip.flow_hash = 0;
160  hash_c3 = vnet_buffer(b3)->ip.flow_hash = 0;
161 
162  if (MPLS_IS_REPLICATE & lbi0)
163  {
165  vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
166  (lbi0 & ~MPLS_IS_REPLICATE);
167  }
168  else
169  {
170  lb0 = load_balance_get(lbi0);
171  ASSERT (lb0->lb_n_buckets > 0);
172  ASSERT (is_pow2 (lb0->lb_n_buckets));
173 
174  if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
175  {
176  hash_c0 = vnet_buffer (b0)->ip.flow_hash =
179  (lb0,
180  (hash_c0 & (lb0->lb_n_buckets_minus_1)));
181  }
182  else
183  {
184  dpo0 = load_balance_get_bucket_i (lb0, 0);
185  }
186  next0 = dpo0->dpoi_next_node;
187 
188  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
189 
191  (cm, thread_index, lbi0, 1,
192  vlib_buffer_length_in_chain (vm, b0));
193  }
194  if (MPLS_IS_REPLICATE & lbi1)
195  {
197  vnet_buffer (b1)->ip.adj_index[VLIB_TX] =
198  (lbi1 & ~MPLS_IS_REPLICATE);
199  }
200  else
201  {
202  lb1 = load_balance_get(lbi1);
203  ASSERT (lb1->lb_n_buckets > 0);
204  ASSERT (is_pow2 (lb1->lb_n_buckets));
205 
206  if (PREDICT_FALSE(lb1->lb_n_buckets > 1))
207  {
208  hash_c1 = vnet_buffer (b1)->ip.flow_hash =
211  (lb1,
212  (hash_c1 & (lb1->lb_n_buckets_minus_1)));
213  }
214  else
215  {
216  dpo1 = load_balance_get_bucket_i (lb1, 0);
217  }
218  next1 = dpo1->dpoi_next_node;
219 
220  vnet_buffer (b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
221 
223  (cm, thread_index, lbi1, 1,
224  vlib_buffer_length_in_chain (vm, b1));
225  }
226  if (MPLS_IS_REPLICATE & lbi2)
227  {
229  vnet_buffer (b2)->ip.adj_index[VLIB_TX] =
230  (lbi2 & ~MPLS_IS_REPLICATE);
231  }
232  else
233  {
234  lb2 = load_balance_get(lbi2);
235  ASSERT (lb2->lb_n_buckets > 0);
236  ASSERT (is_pow2 (lb2->lb_n_buckets));
237 
238  if (PREDICT_FALSE(lb2->lb_n_buckets > 1))
239  {
240  hash_c2 = vnet_buffer (b2)->ip.flow_hash =
243  (lb2,
244  (hash_c2 & (lb2->lb_n_buckets_minus_1)));
245  }
246  else
247  {
248  dpo2 = load_balance_get_bucket_i (lb2, 0);
249  }
250  next2 = dpo2->dpoi_next_node;
251 
252  vnet_buffer (b2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
253 
255  (cm, thread_index, lbi2, 1,
256  vlib_buffer_length_in_chain (vm, b2));
257  }
258  if (MPLS_IS_REPLICATE & lbi3)
259  {
261  vnet_buffer (b3)->ip.adj_index[VLIB_TX] =
262  (lbi3 & ~MPLS_IS_REPLICATE);
263  }
264  else
265  {
266  lb3 = load_balance_get(lbi3);
267  ASSERT (lb3->lb_n_buckets > 0);
268  ASSERT (is_pow2 (lb3->lb_n_buckets));
269 
270  if (PREDICT_FALSE(lb3->lb_n_buckets > 1))
271  {
272  hash_c3 = vnet_buffer (b3)->ip.flow_hash =
275  (lb3,
276  (hash_c3 & (lb3->lb_n_buckets_minus_1)));
277  }
278  else
279  {
280  dpo3 = load_balance_get_bucket_i (lb3, 0);
281  }
282  next3 = dpo3->dpoi_next_node;
283 
284  vnet_buffer (b3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
285 
287  (cm, thread_index, lbi3, 1,
288  vlib_buffer_length_in_chain (vm, b3));
289  }
290 
291  /*
292  * before we pop the label copy th values we need to maintain.
293  * The label header is in network byte order.
294  * last byte is the TTL.
295  * bits 2 to 4 inclusive are the EXP bits
296  */
297  vnet_buffer (b0)->mpls.ttl = ((char*)h0)[3];
298  vnet_buffer (b0)->mpls.exp = (((char*)h0)[2] & 0xe) >> 1;
299  vnet_buffer (b0)->mpls.first = 1;
300  vnet_buffer (b1)->mpls.ttl = ((char*)h1)[3];
301  vnet_buffer (b1)->mpls.exp = (((char*)h1)[2] & 0xe) >> 1;
302  vnet_buffer (b1)->mpls.first = 1;
303  vnet_buffer (b2)->mpls.ttl = ((char*)h2)[3];
304  vnet_buffer (b2)->mpls.exp = (((char*)h2)[2] & 0xe) >> 1;
305  vnet_buffer (b2)->mpls.first = 1;
306  vnet_buffer (b3)->mpls.ttl = ((char*)h3)[3];
307  vnet_buffer (b3)->mpls.exp = (((char*)h3)[2] & 0xe) >> 1;
308  vnet_buffer (b3)->mpls.first = 1;
309 
310  /*
311  * pop the label that was just used in the lookup
312  */
313  vlib_buffer_advance(b0, sizeof(*h0));
314  vlib_buffer_advance(b1, sizeof(*h1));
315  vlib_buffer_advance(b2, sizeof(*h2));
316  vlib_buffer_advance(b3, sizeof(*h3));
317 
318  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
319  {
320  mpls_lookup_trace_t *tr = vlib_add_trace (vm, node,
321  b0, sizeof (*tr));
322  tr->next_index = next0;
323  tr->lb_index = lbi0;
324  tr->lfib_index = lfib_index0;
325  tr->hash = hash_c0;
327  }
328 
329  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
330  {
331  mpls_lookup_trace_t *tr = vlib_add_trace (vm, node,
332  b1, sizeof (*tr));
333  tr->next_index = next1;
334  tr->lb_index = lbi1;
335  tr->lfib_index = lfib_index1;
336  tr->hash = hash_c1;
338  }
339 
340  if (PREDICT_FALSE(b2->flags & VLIB_BUFFER_IS_TRACED))
341  {
342  mpls_lookup_trace_t *tr = vlib_add_trace (vm, node,
343  b2, sizeof (*tr));
344  tr->next_index = next2;
345  tr->lb_index = lbi2;
346  tr->lfib_index = lfib_index2;
347  tr->hash = hash_c2;
349  }
350 
351  if (PREDICT_FALSE(b3->flags & VLIB_BUFFER_IS_TRACED))
352  {
353  mpls_lookup_trace_t *tr = vlib_add_trace (vm, node,
354  b3, sizeof (*tr));
355  tr->next_index = next3;
356  tr->lb_index = lbi3;
357  tr->lfib_index = lfib_index3;
358  tr->hash = hash_c3;
360  }
361 
362  vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
363  to_next, n_left_to_next,
364  bi0, bi1, bi2, bi3,
365  next0, next1, next2, next3);
366  }
367 
368  while (n_left_from > 0 && n_left_to_next > 0)
369  {
370  u32 lbi0, next0, lfib_index0, bi0, hash_c0;
371  const mpls_unicast_header_t * h0;
372  const load_balance_t *lb0;
373  const dpo_id_t *dpo0;
374  vlib_buffer_t * b0;
375 
376  bi0 = from[0];
377  to_next[0] = bi0;
378  from += 1;
379  to_next += 1;
380  n_left_from -= 1;
381  n_left_to_next -= 1;
382 
383  b0 = vlib_get_buffer (vm, bi0);
384  h0 = vlib_buffer_get_current (b0);
385 
386  lfib_index0 = vec_elt(mm->fib_index_by_sw_if_index,
387  vnet_buffer(b0)->sw_if_index[VLIB_RX]);
388 
389  lbi0 = mpls_fib_table_forwarding_lookup(lfib_index0, h0);
390  hash_c0 = vnet_buffer(b0)->ip.flow_hash = 0;
391 
392  if (MPLS_IS_REPLICATE & lbi0)
393  {
395  vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
396  (lbi0 & ~MPLS_IS_REPLICATE);
397  }
398  else
399  {
400  lb0 = load_balance_get(lbi0);
401  ASSERT (lb0->lb_n_buckets > 0);
402  ASSERT (is_pow2 (lb0->lb_n_buckets));
403 
404  if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
405  {
406  hash_c0 = vnet_buffer (b0)->ip.flow_hash =
409  (lb0,
410  (hash_c0 & (lb0->lb_n_buckets_minus_1)));
411  }
412  else
413  {
414  dpo0 = load_balance_get_bucket_i (lb0, 0);
415  }
416  next0 = dpo0->dpoi_next_node;
417  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
418 
420  (cm, thread_index, lbi0, 1,
421  vlib_buffer_length_in_chain (vm, b0));
422  }
423 
424  /*
425  * before we pop the label copy, values we need to maintain.
426  * The label header is in network byte order.
427  * last byte is the TTL.
428  * bits 2 to 4 inclusive are the EXP bits
429  */
430  vnet_buffer (b0)->mpls.ttl = ((char*)h0)[3];
431  vnet_buffer (b0)->mpls.exp = (((char*)h0)[2] & 0xe) >> 1;
432  vnet_buffer (b0)->mpls.first = 1;
433 
434  /*
435  * pop the label that was just used in the lookup
436  */
437  vlib_buffer_advance(b0, sizeof(*h0));
438 
439  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
440  {
441  mpls_lookup_trace_t *tr = vlib_add_trace (vm, node,
442  b0, sizeof (*tr));
443  tr->next_index = next0;
444  tr->lb_index = lbi0;
445  tr->lfib_index = lfib_index0;
446  tr->hash = hash_c0;
448  }
449 
450  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
451  to_next, n_left_to_next,
452  bi0, next0);
453  }
454 
455  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
456  }
458  MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
459  return from_frame->n_vectors;
460 }
461 
462 static char * mpls_error_strings[] = {
463 #define mpls_error(n,s) s,
464 #include "error.def"
465 #undef mpls_error
466 };
467 
469  .function = mpls_lookup,
470  .name = "mpls-lookup",
471  /* Takes a vector of packets. */
472  .vector_size = sizeof (u32),
473  .n_errors = MPLS_N_ERROR,
474  .error_strings = mpls_error_strings,
475 
476  .sibling_of = "mpls-load-balance",
477 
478  .format_buffer = format_mpls_header,
479  .format_trace = format_mpls_lookup_trace,
480  .unformat_buffer = unformat_mpls_header,
481 };
482 
484 
485 typedef struct {
490 
491 static u8 *
492 format_mpls_load_balance_trace (u8 * s, va_list * args)
493 {
494  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
495  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
497 
498  s = format (s, "MPLS: next [%d], LB index %d hash %d",
499  t->next_index, t->lb_index, t->hash);
500  return s;
501 }
502 
503 static uword
505  vlib_node_runtime_t * node,
506  vlib_frame_t * frame)
507 {
509  u32 n_left_from, n_left_to_next, * from, * to_next;
510  u32 thread_index = vlib_get_thread_index();
511  u32 next;
512 
513  from = vlib_frame_vector_args (frame);
514  n_left_from = frame->n_vectors;
515  next = node->cached_next_index;
516 
517  while (n_left_from > 0)
518  {
519  vlib_get_next_frame (vm, node, next,
520  to_next, n_left_to_next);
521 
522 
523  while (n_left_from >= 4 && n_left_to_next >= 2)
524  {
525  const load_balance_t *lb0, *lb1;
526  vlib_buffer_t * p0, *p1;
527  u32 pi0, lbi0, hc0, pi1, lbi1, hc1, next0, next1;
528  const mpls_unicast_header_t *mpls0, *mpls1;
529  const dpo_id_t *dpo0, *dpo1;
530 
531  /* Prefetch next iteration. */
532  {
533  vlib_buffer_t * p2, * p3;
534 
535  p2 = vlib_get_buffer (vm, from[2]);
536  p3 = vlib_get_buffer (vm, from[3]);
537 
538  vlib_prefetch_buffer_header (p2, STORE);
539  vlib_prefetch_buffer_header (p3, STORE);
540 
541  CLIB_PREFETCH (p2->data, sizeof (mpls0[0]), LOAD);
542  CLIB_PREFETCH (p3->data, sizeof (mpls0[0]), LOAD);
543  }
544 
545  pi0 = to_next[0] = from[0];
546  pi1 = to_next[1] = from[1];
547 
548  from += 2;
549  n_left_from -= 2;
550  to_next += 2;
551  n_left_to_next -= 2;
552 
553  p0 = vlib_get_buffer (vm, pi0);
554  p1 = vlib_get_buffer (vm, pi1);
555 
556  mpls0 = vlib_buffer_get_current (p0);
557  mpls1 = vlib_buffer_get_current (p1);
558  lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
559  lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
560 
561  lb0 = load_balance_get(lbi0);
562  lb1 = load_balance_get(lbi1);
563 
564  /*
565  * this node is for via FIBs we can re-use the hash value from the
566  * to node if present.
567  * We don't want to use the same hash value at each level in the recursion
568  * graph as that would lead to polarisation
569  */
570  hc0 = vnet_buffer (p0)->ip.flow_hash = 0;
571  hc1 = vnet_buffer (p1)->ip.flow_hash = 0;
572 
573  if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
574  {
575  if (PREDICT_TRUE (vnet_buffer(p0)->ip.flow_hash))
576  {
577  hc0 = vnet_buffer(p0)->ip.flow_hash = vnet_buffer(p0)->ip.flow_hash >> 1;
578  }
579  else
580  {
581  hc0 = vnet_buffer(p0)->ip.flow_hash = mpls_compute_flow_hash(mpls0, hc0);
582  }
583  dpo0 = load_balance_get_fwd_bucket(lb0, (hc0 & lb0->lb_n_buckets_minus_1));
584  }
585  else
586  {
587  dpo0 = load_balance_get_bucket_i (lb0, 0);
588  }
589  if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
590  {
591  if (PREDICT_TRUE (vnet_buffer(p1)->ip.flow_hash))
592  {
593  hc1 = vnet_buffer(p1)->ip.flow_hash = vnet_buffer(p1)->ip.flow_hash >> 1;
594  }
595  else
596  {
597  hc1 = vnet_buffer(p1)->ip.flow_hash = mpls_compute_flow_hash(mpls1, hc1);
598  }
599  dpo1 = load_balance_get_fwd_bucket(lb1, (hc1 & lb1->lb_n_buckets_minus_1));
600  }
601  else
602  {
603  dpo1 = load_balance_get_bucket_i (lb1, 0);
604  }
605 
606  next0 = dpo0->dpoi_next_node;
607  next1 = dpo1->dpoi_next_node;
608 
609  vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
610  vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
611 
613  (cm, thread_index, lbi0, 1,
614  vlib_buffer_length_in_chain (vm, p0));
616  (cm, thread_index, lbi1, 1,
617  vlib_buffer_length_in_chain (vm, p1));
618 
619  if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
620  {
622  p0, sizeof (*tr));
623  tr->next_index = next0;
624  tr->lb_index = lbi0;
625  tr->hash = hc0;
626  }
627 
628  vlib_validate_buffer_enqueue_x2 (vm, node, next,
629  to_next, n_left_to_next,
630  pi0, pi1, next0, next1);
631  }
632 
633  while (n_left_from > 0 && n_left_to_next > 0)
634  {
635  const load_balance_t *lb0;
636  vlib_buffer_t * p0;
637  u32 pi0, lbi0, hc0, next0;
638  const mpls_unicast_header_t *mpls0;
639  const dpo_id_t *dpo0;
640 
641  pi0 = from[0];
642  to_next[0] = pi0;
643  from += 1;
644  to_next += 1;
645  n_left_to_next -= 1;
646  n_left_from -= 1;
647 
648  p0 = vlib_get_buffer (vm, pi0);
649 
650  mpls0 = vlib_buffer_get_current (p0);
651  lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
652 
653  lb0 = load_balance_get(lbi0);
654 
655  hc0 = vnet_buffer (p0)->ip.flow_hash = 0;
656  if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
657  {
658  if (PREDICT_TRUE (vnet_buffer(p0)->ip.flow_hash))
659  {
660  hc0 = vnet_buffer(p0)->ip.flow_hash = vnet_buffer(p0)->ip.flow_hash >> 1;
661  }
662  else
663  {
664  hc0 = vnet_buffer(p0)->ip.flow_hash = mpls_compute_flow_hash(mpls0, hc0);
665  }
666  dpo0 = load_balance_get_fwd_bucket(lb0, (hc0 & lb0->lb_n_buckets_minus_1));
667  }
668  else
669  {
670  dpo0 = load_balance_get_bucket_i (lb0, 0);
671  }
672 
673  next0 = dpo0->dpoi_next_node;
674  vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
675 
677  (cm, thread_index, lbi0, 1,
678  vlib_buffer_length_in_chain (vm, p0));
679 
680  vlib_validate_buffer_enqueue_x1 (vm, node, next,
681  to_next, n_left_to_next,
682  pi0, next0);
683  }
684 
685  vlib_put_next_frame (vm, node, next, n_left_to_next);
686  }
687 
688  return frame->n_vectors;
689 }
690 
692  .function = mpls_load_balance,
693  .name = "mpls-load-balance",
694  .vector_size = sizeof (u32),
695  .format_trace = format_mpls_load_balance_trace,
696  .n_next_nodes = 1,
697  .next_nodes =
698  {
699  [0] = "mpls-drop",
700  },
701 
702 };
703 
705 
706 
707 static clib_error_t *
709 {
710  clib_error_t * error;
711 
712  if ((error = vlib_call_init_function (vm, mpls_init)))
713  return error;
714 
717  mpls_lookup_node.index,
718  "mpls-replicate");
719 
720  return (NULL);
721 }
722 
u16 lb_n_buckets
number of buckets in the load-balance.
Definition: load_balance.h:94
vlib_combined_counter_main_t lbm_to_counters
Definition: load_balance.h:46
#define CLIB_UNUSED(x)
Definition: clib.h:79
format_function_t format_mpls_header
Definition: mpls.h:70
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:213
#define PREDICT_TRUE(x)
Definition: clib.h:106
static uword vlib_node_add_named_next(vlib_main_t *vm, uword node, char *name)
Definition: node_funcs.h:1122
#define NULL
Definition: clib.h:55
u32 * fib_index_by_sw_if_index
Definition: mpls.h:44
flow_hash_config_t lb_hash_config
the hash config to use when selecting a bucket.
Definition: load_balance.h:134
static const dpo_id_t * load_balance_get_fwd_bucket(const load_balance_t *lb, u16 bucket)
#define vlib_validate_buffer_enqueue_x4(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, bi2, bi3, next0, next1, next2, next3)
Finish enqueueing four buffers forward in the graph.
Definition: buffer_node.h:138
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:250
unsigned char u8
Definition: types.h:56
static vlib_node_registration_t mpls_lookup_node
Static MPLS VLIB forwarding node.
Definition: mpls_lookup.c:28
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:156
u16 lb_n_buckets_minus_1
number of buckets in the load-balance - 1.
Definition: load_balance.h:99
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:184
#define MPLS_IS_REPLICATE
The top bit of the index, which is the result of the MPLS lookup is used to determine if the DPO is a...
Definition: mpls_types.h:66
unsigned int u32
Definition: types.h:88
#define vlib_call_init_function(vm, x)
Definition: init.h:227
static uword mpls_lookup(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: mpls_lookup.c:61
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:194
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:168
static const dpo_id_t * load_balance_get_bucket_i(const load_balance_t *lb, u32 bucket)
Definition: load_balance.h:209
static u32 mpls_compute_flow_hash(const mpls_unicast_header_t *hdr, flow_hash_config_t flow_hash_config)
Definition: mpls_lookup.h:32
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:202
The FIB DPO provieds;.
Definition: load_balance.h:84
#define PREDICT_FALSE(x)
Definition: clib.h:105
static u32 vnet_mpls_uc_get_label(mpls_label_t label_exp_s_ttl)
Definition: packet.h:103
load_balance_main_t load_balance_main
The one instance of load-balance main.
Definition: load_balance.c:56
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:364
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1168
u32 mpls_lookup_to_replicate_edge
The arc/edge from the MPLS lookup node to the MPLS replicate node.
Definition: mpls_lookup.c:33
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:153
u16 n_vectors
Definition: node.h:380
mpls_main_t mpls_main
Definition: mpls.c:25
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:77
vlib_main_t * vm
Definition: buffer.c:294
unformat_function_t unformat_mpls_header
Definition: mpls.h:82
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:454
vlib_combined_counter_main_t lbm_via_counters
Definition: load_balance.h:47
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:492
#define ASSERT(truth)
static load_balance_t * load_balance_get(index_t lbi)
Definition: load_balance.h:200
static char * mpls_error_strings[]
Definition: mpls_lookup.c:462
mpls_label_t label_exp_s_ttl
Definition: packet.h:31
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:215
static uword mpls_load_balance(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: mpls_lookup.c:504
static uword is_pow2(uword x)
Definition: clib.h:229
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:55
static clib_error_t * mpls_init(vlib_main_t *vm)
Definition: mpls.c:473
#define vec_elt(v, i)
Get vector value at index i.
struct _vlib_node_registration vlib_node_registration_t
Definition: defs.h:47
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:184
static u32 vnet_mpls_uc_get_s(mpls_label_t label_exp_s_ttl)
Definition: packet.h:113
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
A collection of combined counters.
Definition: counter.h:181
static index_t mpls_fib_table_forwarding_lookup(u32 mpls_fib_index, const mpls_unicast_header_t *hdr)
Lookup a label and EOS bit in the MPLS_FIB table to retrieve the load-balance index to be used for pa...
Definition: mpls_fib.h:121
#define vnet_buffer(b)
Definition: buffer.h:360
static u8 * format_mpls_load_balance_trace(u8 *s, va_list *args)
Definition: mpls_lookup.c:492
u8 data[0]
Packet data.
Definition: buffer.h:172
u16 dpoi_next_node
The next VLIB node to follow.
Definition: dpo.h:180
static u8 * format_mpls_lookup_trace(u8 *s, va_list *args)
Definition: mpls_lookup.c:44
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:111
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
static clib_error_t * mpls_lookup_init(vlib_main_t *vm)
Definition: mpls_lookup.c:708
Definition: defs.h:46
vlib_node_registration_t mpls_load_balance_node
(constructor) VLIB_REGISTER_NODE (mpls_load_balance_node)
Definition: mpls_lookup.c:691