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Vector Packet Processing
interface.c
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  * ethernet_interface.c: ethernet interfaces
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
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:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
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.
38  */
39 
40 #include <vnet/vnet.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/pg/pg.h>
43 #include <vnet/ethernet/ethernet.h>
44 #include <vnet/ethernet/arp.h>
45 #include <vnet/l2/l2_input.h>
46 #include <vnet/l2/l2_bd.h>
47 #include <vnet/adj/adj.h>
48 
49 /**
50  * @file
51  * @brief Loopback Interfaces.
52  *
53  * This file contains code to manage loopback interfaces.
54  */
55 
56 const u8 *
58 {
59  const static u8 ethernet_mcast_dst_mac[] = {
60  0x1, 0x0, 0x5e, 0x0, 0x0, 0x0,
61  };
62 
63  return (ethernet_mcast_dst_mac);
64 }
65 
66 const u8 *
68 {
69  const static u8 ethernet_mcast_dst_mac[] = {
70  0x33, 0x33, 0x00, 0x0, 0x0, 0x0,
71  };
72 
73  return (ethernet_mcast_dst_mac);
74 }
75 
76 /**
77  * @brief build a rewrite string to use for sending packets of type 'link_type'
78  * to 'dst_address'
79  */
80 u8 *
83  vnet_link_t link_type, const void *dst_address)
84 {
85  vnet_sw_interface_t *sub_sw = vnet_get_sw_interface (vnm, sw_if_index);
86  vnet_sw_interface_t *sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
87  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
92  uword n_bytes = sizeof (h[0]);
93  u8 *rewrite = NULL;
94  u8 is_p2p = 0;
95 
96  if ((sub_sw->type == VNET_SW_INTERFACE_TYPE_P2P) ||
97  (sub_sw->type == VNET_SW_INTERFACE_TYPE_PIPE))
98  is_p2p = 1;
99  if (sub_sw != sup_sw)
100  {
101  if (sub_sw->sub.eth.flags.one_tag)
102  {
103  n_bytes += sizeof (ethernet_vlan_header_t);
104  }
105  else if (sub_sw->sub.eth.flags.two_tags)
106  {
107  n_bytes += 2 * (sizeof (ethernet_vlan_header_t));
108  }
109  else if (PREDICT_FALSE (is_p2p))
110  {
111  n_bytes = sizeof (ethernet_header_t);
112  }
113  if (PREDICT_FALSE (!is_p2p))
114  {
115  // Check for encaps that are not supported for L3 interfaces
116  if (!(sub_sw->sub.eth.flags.exact_match) ||
117  (sub_sw->sub.eth.flags.default_sub) ||
118  (sub_sw->sub.eth.flags.outer_vlan_id_any) ||
119  (sub_sw->sub.eth.flags.inner_vlan_id_any))
120  {
121  return 0;
122  }
123  }
124  else
125  {
126  n_bytes = sizeof (ethernet_header_t);
127  }
128  }
129 
130  switch (link_type)
131  {
132 #define _(a,b) case VNET_LINK_##a: type = ETHERNET_TYPE_##b; break
133  _(IP4, IP4);
134  _(IP6, IP6);
135  _(MPLS, MPLS);
136  _(ARP, ARP);
137 #undef _
138  default:
139  return NULL;
140  }
141 
142  vec_validate (rewrite, n_bytes - 1);
143  h = (ethernet_header_t *) rewrite;
144  ei = pool_elt_at_index (em->interfaces, hw->hw_instance);
145  clib_memcpy (h->src_address, ei->address, sizeof (h->src_address));
146  if (is_p2p)
147  {
148  clib_memcpy (h->dst_address, sub_sw->p2p.client_mac,
149  sizeof (h->dst_address));
150  }
151  else
152  {
153  if (dst_address)
154  clib_memcpy (h->dst_address, dst_address, sizeof (h->dst_address));
155  else
156  clib_memset (h->dst_address, ~0, sizeof (h->dst_address)); /* broadcast */
157  }
158 
159  if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.one_tag)
160  {
161  ethernet_vlan_header_t *outer = (void *) (h + 1);
162 
163  h->type = sub_sw->sub.eth.flags.dot1ad ?
164  clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
165  clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
166  outer->priority_cfi_and_id =
167  clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
168  outer->type = clib_host_to_net_u16 (type);
169 
170  }
171  else if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.two_tags)
172  {
173  ethernet_vlan_header_t *outer = (void *) (h + 1);
174  ethernet_vlan_header_t *inner = (void *) (outer + 1);
175 
176  h->type = sub_sw->sub.eth.flags.dot1ad ?
177  clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
178  clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
179  outer->priority_cfi_and_id =
180  clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
181  outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
182  inner->priority_cfi_and_id =
183  clib_host_to_net_u16 (sub_sw->sub.eth.inner_vlan_id);
184  inner->type = clib_host_to_net_u16 (type);
185 
186  }
187  else
188  {
189  h->type = clib_host_to_net_u16 (type);
190  }
191 
192  return (rewrite);
193 }
194 
195 void
197 {
198  ip_adjacency_t *adj;
199 
200  adj = adj_get (ai);
201 
202  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
203  if ((si->type == VNET_SW_INTERFACE_TYPE_P2P) ||
205  {
206  default_update_adjacency (vnm, sw_if_index, ai);
207  }
208  else if (FIB_PROTOCOL_IP4 == adj->ia_nh_proto)
209  {
210  arp_update_adjacency (vnm, sw_if_index, ai);
211  }
212  else if (FIB_PROTOCOL_IP6 == adj->ia_nh_proto)
213  {
214  ip6_ethernet_update_adjacency (vnm, sw_if_index, ai);
215  }
216  else
217  {
218  ASSERT (0);
219  }
220 }
221 
222 static clib_error_t *
224  const u8 * old_address, const u8 * mac_address)
225 {
227  ethernet_main_t *em;
228 
229  em = &ethernet_main;
230  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
231 
234  clib_memcpy (hi->hw_address, mac_address, vec_len (hi->hw_address));
235 
236  clib_memcpy (ei->address, (u8 *) mac_address, sizeof (ei->address));
239 
240  return (NULL);
241 }
242 
243 /* *INDENT-OFF* */
245  .name = "Ethernet",
246  .format_address = format_ethernet_address,
247  .format_header = format_ethernet_header_with_length,
248  .unformat_hw_address = unformat_ethernet_address,
249  .unformat_header = unformat_ethernet_header,
250  .build_rewrite = ethernet_build_rewrite,
251  .update_adjacency = ethernet_update_adjacency,
252  .mac_addr_change_function = ethernet_mac_change,
253 };
254 /* *INDENT-ON* */
255 
256 uword
258 {
259  vnet_main_t *vnm = va_arg (*args, vnet_main_t *);
260  u32 *result = va_arg (*args, u32 *);
261  u32 hw_if_index;
264 
265  if (!unformat_user (input, unformat_vnet_hw_interface, vnm, &hw_if_index))
266  return 0;
267 
268  eif = ethernet_get_interface (em, hw_if_index);
269  if (eif)
270  {
271  *result = hw_if_index;
272  return 1;
273  }
274  return 0;
275 }
276 
277 clib_error_t *
279  u32 dev_class_index,
280  u32 dev_instance,
281  const u8 * address,
282  u32 * hw_if_index_return,
284 {
288  clib_error_t *error = 0;
289  u32 hw_if_index;
290 
291  pool_get (em->interfaces, ei);
292  ei->flag_change = flag_change;
293 
294  hw_if_index = vnet_register_interface
295  (vnm,
296  dev_class_index, dev_instance,
297  ethernet_hw_interface_class.index, ei - em->interfaces);
298  *hw_if_index_return = hw_if_index;
299 
300  hi = vnet_get_hw_interface (vnm, hw_if_index);
301 
303 
308 
309  /* Standard default ethernet MTU. */
310  vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
311 
312  clib_memcpy (ei->address, address, sizeof (ei->address));
313  vec_add (hi->hw_address, address, sizeof (ei->address));
314 
315  if (error)
316  {
317  pool_put (em->interfaces, ei);
318  return error;
319  }
320  return error;
321 }
322 
323 void
325 {
329  main_intf_t *main_intf;
330  vlan_table_t *vlan_table;
331  u32 idx;
332 
333  hi = vnet_get_hw_interface (vnm, hw_if_index);
334  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
335 
336  /* Delete vlan mapping table for dot1q and dot1ad. */
337  main_intf = vec_elt_at_index (em->main_intfs, hi->hw_if_index);
338  if (main_intf->dot1q_vlans)
339  {
340  vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1q_vlans);
341  for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
342  {
343  if (vlan_table->vlans[idx].qinqs)
344  {
345  pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
346  vlan_table->vlans[idx].qinqs = 0;
347  }
348  }
349  pool_put_index (em->vlan_pool, main_intf->dot1q_vlans);
350  main_intf->dot1q_vlans = 0;
351  }
352  if (main_intf->dot1ad_vlans)
353  {
354  vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1ad_vlans);
355  for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
356  {
357  if (vlan_table->vlans[idx].qinqs)
358  {
359  pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
360  vlan_table->vlans[idx].qinqs = 0;
361  }
362  }
363  pool_put_index (em->vlan_pool, main_intf->dot1ad_vlans);
364  main_intf->dot1ad_vlans = 0;
365  }
366 
367  vnet_delete_hw_interface (vnm, hw_if_index);
368  pool_put (em->interfaces, ei);
369 }
370 
371 u32
373 {
377 
378  hi = vnet_get_hw_interface (vnm, hw_if_index);
379 
381 
382  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
383  ei->flags = flags;
384  if (ei->flag_change)
385  return ei->flag_change (vnm, hi, flags);
386  return (u32) ~ 0;
387 }
388 
389 /**
390  * Echo packets back to ethernet/l2-input.
391  */
392 static uword
395  node, vlib_frame_t * frame)
396 {
397  u32 n_left_from, *from;
398  u32 next_index = 0;
399  u32 n_bytes;
400  u32 thread_index = vm->thread_index;
401  vnet_main_t *vnm = vnet_get_main ();
403  l2_input_config_t *config;
404  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
405  u16 nexts[VLIB_FRAME_SIZE], *next;
406  u32 new_rx_sw_if_index = ~0;
407  u32 new_tx_sw_if_index = ~0;
408 
409  n_left_from = frame->n_vectors;
410  from = vlib_frame_vector_args (frame);
411 
412  vlib_get_buffers (vm, from, bufs, n_left_from);
413  b = bufs;
414  next = nexts;
415 
416  /* Ordinarily, this is the only config lookup. */
418  next_index =
421  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
422  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
423 
424  while (n_left_from >= 4)
425  {
426  u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
427  u32 not_all_match_config;
428 
429  /* Prefetch next iteration. */
430  if (PREDICT_TRUE (n_left_from >= 8))
431  {
432  vlib_prefetch_buffer_header (b[4], STORE);
433  vlib_prefetch_buffer_header (b[5], STORE);
434  vlib_prefetch_buffer_header (b[6], STORE);
435  vlib_prefetch_buffer_header (b[7], STORE);
436  }
437 
438  /* Make sure all pkts were transmitted on the same (loop) intfc */
439  sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
440  sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
441  sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
442  sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
443 
444  not_all_match_config = (sw_if_index0 ^ sw_if_index1)
445  ^ (sw_if_index2 ^ sw_if_index3);
446  not_all_match_config += sw_if_index0 ^ new_rx_sw_if_index;
447 
448  /* Speed path / expected case: all pkts on the same intfc */
449  if (PREDICT_TRUE (not_all_match_config == 0))
450  {
451  next[0] = next_index;
452  next[1] = next_index;
453  next[2] = next_index;
454  next[3] = next_index;
455  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
456  vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
457  vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
458  vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
459  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
460  vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
461  vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
462  vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
463  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
464  n_bytes += vlib_buffer_length_in_chain (vm, b[1]);
465  n_bytes += vlib_buffer_length_in_chain (vm, b[2]);
466  n_bytes += vlib_buffer_length_in_chain (vm, b[3]);
467 
469  {
470  vnet_update_l2_len (b[0]);
471  vnet_update_l2_len (b[1]);
472  vnet_update_l2_len (b[2]);
473  vnet_update_l2_len (b[3]);
474  }
475 
476  /* increment TX interface stat */
479  thread_index, new_rx_sw_if_index,
480  4 /* pkts */ , n_bytes);
481  b += 4;
482  next += 4;
483  n_left_from -= 4;
484  continue;
485  }
486 
487  /*
488  * Slow path: we know that at least one of the pkts
489  * was transmitted on a different sw_if_index, so
490  * check each sw_if_index against the cached data and proceed
491  * accordingly.
492  *
493  * This shouldn't happen, but code can (and does) bypass the
494  * per-interface output node, so deal with it.
495  */
496  if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
497  != new_rx_sw_if_index))
498  {
499  config = l2input_intf_config
500  (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
501  next_index =
504  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
505  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
506  }
507  next[0] = next_index;
508  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
509  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
510  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
512  vnet_update_l2_len (b[0]);
513 
516  thread_index, new_rx_sw_if_index,
517  1 /* pkts */ , n_bytes);
518 
519  if (PREDICT_FALSE (vnet_buffer (b[1])->sw_if_index[VLIB_TX]
520  != new_rx_sw_if_index))
521  {
522  config = l2input_intf_config
523  (vnet_buffer (b[1])->sw_if_index[VLIB_TX]);
524  next_index =
527  new_rx_sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
528  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
529  }
530  next[1] = next_index;
531  vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
532  vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
533  n_bytes = vlib_buffer_length_in_chain (vm, b[1]);
535  vnet_update_l2_len (b[1]);
536 
539  thread_index, new_rx_sw_if_index,
540  1 /* pkts */ , n_bytes);
541 
542  if (PREDICT_FALSE (vnet_buffer (b[2])->sw_if_index[VLIB_TX]
543  != new_rx_sw_if_index))
544  {
545  config = l2input_intf_config
546  (vnet_buffer (b[2])->sw_if_index[VLIB_TX]);
547  next_index =
550  new_rx_sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
551  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
552  }
553  next[2] = next_index;
554  vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
555  vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
556  n_bytes = vlib_buffer_length_in_chain (vm, b[2]);
558  vnet_update_l2_len (b[2]);
559 
562  thread_index, new_rx_sw_if_index,
563  1 /* pkts */ , n_bytes);
564 
565  if (PREDICT_FALSE (vnet_buffer (b[3])->sw_if_index[VLIB_TX]
566  != new_rx_sw_if_index))
567  {
568  config = l2input_intf_config
569  (vnet_buffer (b[3])->sw_if_index[VLIB_TX]);
570  next_index =
573  new_rx_sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
574  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
575  }
576  next[3] = next_index;
577  vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
578  vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
579  n_bytes = vlib_buffer_length_in_chain (vm, b[3]);
581  vnet_update_l2_len (b[3]);
582 
585  thread_index, new_rx_sw_if_index,
586  1 /* pkts */ , n_bytes);
587  b += 4;
588  next += 4;
589  n_left_from -= 4;
590  }
591  while (n_left_from > 0)
592  {
593  if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
594  != new_rx_sw_if_index))
595  {
596  config = l2input_intf_config
597  (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
598  next_index =
601  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
602  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
603  }
604  next[0] = next_index;
605  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
606  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
607  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
609  vnet_update_l2_len (b[0]);
610 
613  thread_index, new_rx_sw_if_index,
614  1 /* pkts */ , n_bytes);
615  b += 1;
616  next += 1;
617  n_left_from -= 1;
618  }
619 
620  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
621 
622  return frame->n_vectors;
623 }
624 
625 static u8 *
626 format_simulated_ethernet_name (u8 * s, va_list * args)
627 {
628  u32 dev_instance = va_arg (*args, u32);
629  return format (s, "loop%d", dev_instance);
630 }
631 
632 static clib_error_t *
634  u32 flags)
635 {
636  u32 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
638  vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
639  return 0;
640 }
641 
642 static clib_error_t *
644  const u8 * old_address, const u8 * mac_address)
645 {
646  l2input_interface_mac_change (hi->sw_if_index, old_address, mac_address);
647 
648  return (NULL);
649 }
650 
651 
652 /* *INDENT-OFF* */
653 VNET_DEVICE_CLASS (ethernet_simulated_device_class) = {
654  .name = "Loopback",
655  .format_device_name = format_simulated_ethernet_name,
656  .tx_function = simulated_ethernet_interface_tx,
657  .admin_up_down_function = simulated_ethernet_admin_up_down,
658  .mac_addr_change_function = simulated_ethernet_mac_change,
659 };
660 /* *INDENT-ON* */
661 
662 /*
663  * Maintain a bitmap of allocated loopback instance numbers.
664  */
665 #define LOOPBACK_MAX_INSTANCE (16 * 1024)
666 
667 static u32
668 loopback_instance_alloc (u8 is_specified, u32 want)
669 {
671 
672  /*
673  * Check for dynamically allocaetd instance number.
674  */
675  if (!is_specified)
676  {
677  u32 bit;
678 
680  if (bit >= LOOPBACK_MAX_INSTANCE)
681  {
682  return ~0;
683  }
685  bit, 1);
686  return bit;
687  }
688 
689  /*
690  * In range?
691  */
692  if (want >= LOOPBACK_MAX_INSTANCE)
693  {
694  return ~0;
695  }
696 
697  /*
698  * Already in use?
699  */
700  if (clib_bitmap_get (em->bm_loopback_instances, want))
701  {
702  return ~0;
703  }
704 
705  /*
706  * Grant allocation request.
707  */
709  want, 1);
710 
711  return want;
712 }
713 
714 static int
716 {
718 
719  if (instance >= LOOPBACK_MAX_INSTANCE)
720  {
721  return -1;
722  }
723 
724  if (clib_bitmap_get (em->bm_loopback_instances, instance) == 0)
725  {
726  return -1;
727  }
728 
730  instance, 0);
731  return 0;
732 }
733 
734 int
736  u8 is_specified, u32 user_instance)
737 {
738  vnet_main_t *vnm = vnet_get_main ();
740  clib_error_t *error;
741  u32 instance;
742  u8 address[6];
743  u32 hw_if_index;
744  vnet_hw_interface_t *hw_if;
745  u32 slot;
746  int rv = 0;
747 
748  ASSERT (sw_if_indexp);
749 
750  *sw_if_indexp = (u32) ~ 0;
751 
752  clib_memset (address, 0, sizeof (address));
753 
754  /*
755  * Allocate a loopback instance. Either select on dynamically
756  * or try to use the desired user_instance number.
757  */
758  instance = loopback_instance_alloc (is_specified, user_instance);
759  if (instance == ~0)
760  {
761  return VNET_API_ERROR_INVALID_REGISTRATION;
762  }
763 
764  /*
765  * Default MAC address (dead:0000:0000 + instance) is allocated
766  * if zero mac_address is configured. Otherwise, user-configurable MAC
767  * address is programmed on the loopback interface.
768  */
769  if (memcmp (address, mac_address, sizeof (address)))
770  clib_memcpy (address, mac_address, sizeof (address));
771  else
772  {
773  address[0] = 0xde;
774  address[1] = 0xad;
775  address[5] = instance;
776  }
777 
779  (vnm,
780  ethernet_simulated_device_class.index, instance, address, &hw_if_index,
781  /* flag change */ 0);
782 
783  if (error)
784  {
785  rv = VNET_API_ERROR_INVALID_REGISTRATION;
786  clib_error_report (error);
787  return rv;
788  }
789 
790  hw_if = vnet_get_hw_interface (vnm, hw_if_index);
792  (vm, hw_if->tx_node_index,
795 
797  (vm, hw_if->tx_node_index,
800 
801  {
802  vnet_sw_interface_t *si = vnet_get_hw_sw_interface (vnm, hw_if_index);
803  *sw_if_indexp = si->sw_if_index;
804 
805  /* By default don't flood to loopbacks, as packets just keep
806  * coming back ... If this loopback becomes a BVI, we'll change it */
808  }
809 
810  return 0;
811 }
812 
813 static clib_error_t *
815  unformat_input_t * input,
816  vlib_cli_command_t * cmd)
817 {
818  int rv;
820  u8 mac_address[6];
821  u8 is_specified = 0;
822  u32 user_instance = 0;
823 
824  clib_memset (mac_address, 0, sizeof (mac_address));
825 
827  {
828  if (unformat (input, "mac %U", unformat_ethernet_address, mac_address))
829  ;
830  if (unformat (input, "instance %d", &user_instance))
831  is_specified = 1;
832  else
833  break;
834  }
835 
836  rv = vnet_create_loopback_interface (&sw_if_index, mac_address,
837  is_specified, user_instance);
838 
839  if (rv)
840  return clib_error_return (0, "vnet_create_loopback_interface failed");
841 
843  sw_if_index);
844  return 0;
845 }
846 
847 /*?
848  * Create a loopback interface. Optionally, a MAC Address can be
849  * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
850  *
851  * @cliexpar
852  * The following two command syntaxes are equivalent:
853  * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
854  * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
855  * Example of how to create a loopback interface:
856  * @cliexcmd{loopback create-interface}
857 ?*/
858 /* *INDENT-OFF* */
859 VLIB_CLI_COMMAND (create_simulated_ethernet_interface_command, static) = {
860  .path = "loopback create-interface",
861  .short_help = "loopback create-interface [mac <mac-addr>] [instance <instance>]",
863 };
864 /* *INDENT-ON* */
865 
866 /*?
867  * Create a loopback interface. Optionally, a MAC Address can be
868  * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
869  *
870  * @cliexpar
871  * The following two command syntaxes are equivalent:
872  * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
873  * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
874  * Example of how to create a loopback interface:
875  * @cliexcmd{create loopback interface}
876 ?*/
877 /* *INDENT-OFF* */
878 VLIB_CLI_COMMAND (create_loopback_interface_command, static) = {
879  .path = "create loopback interface",
880  .short_help = "create loopback interface [mac <mac-addr>] [instance <instance>]",
882 };
883 /* *INDENT-ON* */
884 
887 {
889  vnet_get_hw_interface (vnet_get_main (), hw_if_index);
890  return (i->hw_class_index ==
892  index ? pool_elt_at_index (em->interfaces, i->hw_instance) : 0);
893 }
894 
895 int
897 {
898  vnet_main_t *vnm = vnet_get_main ();
899 
900  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
901  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
902 
903  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
904  if (hw == 0 || hw->dev_class_index != ethernet_simulated_device_class.index)
905  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
906 
907  if (loopback_instance_free (hw->dev_instance) < 0)
908  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
909 
911 
912  return 0;
913 }
914 
915 int
917 {
918  vnet_main_t *vnm = vnet_get_main ();
920  int rv = 0;
921 
922  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
923  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
924 
925  si = vnet_get_sw_interface (vnm, sw_if_index);
926  if (si->type == VNET_SW_INTERFACE_TYPE_SUB ||
929  {
931  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
932  u64 sup_and_sub_key =
933  ((u64) (si->sup_sw_if_index) << 32) | (u64) si->sub.id;
934  hash_unset_mem_free (&im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
936  vnet_delete_sw_interface (vnm, sw_if_index);
937  }
938  else
939  rv = VNET_API_ERROR_INVALID_SUB_SW_IF_INDEX;
940 
941  return rv;
942 }
943 
944 static clib_error_t *
946  unformat_input_t * input,
947  vlib_cli_command_t * cmd)
948 {
949  int rv;
950  u32 sw_if_index = ~0;
951  vnet_main_t *vnm = vnet_get_main ();
952 
954  {
955  if (unformat (input, "intfc %U",
956  unformat_vnet_sw_interface, vnm, &sw_if_index))
957  ;
958  else
959  break;
960  }
961 
962  if (sw_if_index == ~0)
963  return clib_error_return (0, "interface not specified");
964 
965  rv = vnet_delete_loopback_interface (sw_if_index);
966 
967  if (rv)
968  return clib_error_return (0, "vnet_delete_loopback_interface failed");
969 
970  return 0;
971 }
972 
973 static clib_error_t *
975  unformat_input_t * input, vlib_cli_command_t * cmd)
976 {
977  int rv = 0;
978  u32 sw_if_index = ~0;
979  vnet_main_t *vnm = vnet_get_main ();
980 
982  {
983  if (unformat
984  (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
985  ;
986  else
987  break;
988  }
989  if (sw_if_index == ~0)
990  return clib_error_return (0, "interface doesn't exist");
991 
992  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
993  rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
994  else
995  rv = vnet_delete_sub_interface (sw_if_index);
996  if (rv)
997  return clib_error_return (0, "delete_subinterface_interface failed");
998  return 0;
999 }
1000 
1001 /*?
1002  * Delete a loopback interface.
1003  *
1004  * @cliexpar
1005  * The following two command syntaxes are equivalent:
1006  * @cliexcmd{loopback delete-interface intfc <interface>}
1007  * @cliexcmd{delete loopback interface intfc <interface>}
1008  * Example of how to delete a loopback interface:
1009  * @cliexcmd{loopback delete-interface intfc loop0}
1010 ?*/
1011 /* *INDENT-OFF* */
1012 VLIB_CLI_COMMAND (delete_simulated_ethernet_interface_command, static) = {
1013  .path = "loopback delete-interface",
1014  .short_help = "loopback delete-interface intfc <interface>",
1016 };
1017 /* *INDENT-ON* */
1018 
1019 /*?
1020  * Delete a loopback interface.
1021  *
1022  * @cliexpar
1023  * The following two command syntaxes are equivalent:
1024  * @cliexcmd{loopback delete-interface intfc <interface>}
1025  * @cliexcmd{delete loopback interface intfc <interface>}
1026  * Example of how to delete a loopback interface:
1027  * @cliexcmd{delete loopback interface intfc loop0}
1028 ?*/
1029 /* *INDENT-OFF* */
1030 VLIB_CLI_COMMAND (delete_loopback_interface_command, static) = {
1031  .path = "delete loopback interface",
1032  .short_help = "delete loopback interface intfc <interface>",
1034 };
1035 /* *INDENT-ON* */
1036 
1037 /*?
1038  * Delete a sub-interface.
1039  *
1040  * @cliexpar
1041  * Example of how to delete a sub-interface:
1042  * @cliexcmd{delete sub-interface GigabitEthernet0/8/0.200}
1043 ?*/
1044 /* *INDENT-OFF* */
1045 VLIB_CLI_COMMAND (delete_sub_interface_command, static) = {
1046  .path = "delete sub-interface",
1047  .short_help = "delete sub-interface <interface>",
1048  .function = delete_sub_interface,
1049 };
1050 /* *INDENT-ON* */
1051 
1052 /*
1053  * fd.io coding-style-patch-verification: ON
1054  *
1055  * Local Variables:
1056  * eval: (c-set-style "gnu")
1057  * End:
1058  */
unformat_function_t unformat_vnet_hw_interface
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
vmrglw vmrglh hi
int vnet_delete_loopback_interface(u32 sw_if_index)
Definition: interface.c:896
typedef address
Definition: ip_types.api:83
const u8 * ethernet_ip6_mcast_dst_addr(void)
Definition: interface.c:67
u32 flags
Definition: vhost_user.h:141
#define ETHERNET_N_VLAN
Definition: packet.h:133
static clib_error_t * delete_simulated_ethernet_interfaces(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:945
#define hash_unset(h, key)
Definition: hash.h:261
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:220
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
vnet_interface_main_t interface_main
Definition: vnet.h:56
uword vlib_node_add_named_next_with_slot(vlib_main_t *vm, uword node, char *name, uword slot)
Definition: node.c:244
vnet_p2p_sub_interface_t p2p
Definition: interface.h:726
#define PREDICT_TRUE(x)
Definition: clib.h:113
unsigned long u64
Definition: types.h:89
l2_input_config_t * l2input_intf_config(u32 sw_if_index)
Get a pointer to the config for the given interface.
Definition: l2_input.c:528
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
ethernet_type_t
Definition: packet.h:45
IP unicast adjacency.
Definition: adj.h:221
void ethernet_ndp_change_mac(u32 sw_if_index)
u8 src_address[6]
Definition: packet.h:56
static vnet_hw_interface_t * vnet_get_hw_interface(vnet_main_t *vnm, u32 hw_if_index)
u32 thread_index
Definition: main.h:218
void arp_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: arp.c:519
int i
int vnet_delete_sub_interface(u32 sw_if_index)
Definition: interface.c:916
static uword * clib_bitmap_set(uword *ai, uword i, uword value)
Sets the ith bit of a bitmap to new_value Removes trailing zeros from the bitmap. ...
Definition: bitmap.h:167
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:989
Definition: acl.h:67
main_intf_t * main_intfs
Definition: ethernet.h:281
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
uword * sub_interface_sw_if_index_by_id
Definition: interface.h:554
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
unformat_function_t unformat_vnet_sw_interface
clib_error_t * ethernet_register_interface(vnet_main_t *vnm, u32 dev_class_index, u32 dev_instance, const u8 *address, u32 *hw_if_index_return, ethernet_flag_change_function_t flag_change)
Definition: interface.c:278
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:366
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
format_function_t format_vnet_sw_if_index_name
unsigned char u8
Definition: types.h:56
#define VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT
static vnet_sw_interface_t * vnet_get_hw_sw_interface(vnet_main_t *vnm, u32 hw_if_index)
#define clib_memcpy(d, s, n)
Definition: string.h:180
#define vec_add(V, E, N)
Add N elements to end of vector V (no header, unspecified alignment)
Definition: vec.h:598
ethernet_main_t ethernet_main
Definition: init.c:45
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:433
vnet_flood_class_t flood_class
Definition: interface.h:728
void default_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Default adjacency update function.
Definition: interface.c:1586
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
Definition: acl.h:67
vl_api_interface_index_t sw_if_index
Definition: gre.api:50
void ip6_ethernet_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: ip6_neighbor.c:609
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:846
u8 dst_address[6]
Definition: packet.h:55
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
static vnet_sw_interface_t * vnet_get_sup_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
#define clib_error_return(e, args...)
Definition: error.h:99
ethernet_flag_change_function_t * flag_change
Definition: ethernet.h:151
static clib_error_t * simulated_ethernet_admin_up_down(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:633
unsigned int u32
Definition: types.h:88
u32 vnet_register_interface(vnet_main_t *vnm, u32 dev_class_index, u32 dev_instance, u32 hw_class_index, u32 hw_instance)
Definition: interface.c:762
#define VLIB_FRAME_SIZE
Definition: node.h:378
u32 max_supported_packet_bytes
Definition: interface.h:545
vl_api_fib_path_type_t type
Definition: fib_types.api:123
u16 dot1q_vlans
Definition: ethernet.h:215
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
static clib_error_t * ethernet_mac_change(vnet_hw_interface_t *hi, const u8 *old_address, const u8 *mac_address)
Definition: interface.c:223
vnet_sub_interface_t sub
Definition: interface.h:723
vlib_main_t * vlib_main
Definition: vnet.h:80
static u32 loopback_instance_alloc(u8 is_specified, u32 want)
Definition: interface.c:668
#define LOOPBACK_MAX_INSTANCE
Definition: interface.c:665
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
uword * sw_if_index_by_sup_and_sub
Definition: interface.h:840
static int loopback_instance_free(u32 instance)
Definition: interface.c:715
#define PREDICT_FALSE(x)
Definition: clib.h:112
vl_api_address_union_t src_address
Definition: ip_types.api:97
u16 dot1ad_vlans
Definition: ethernet.h:216
#define L2INPUT_BVI
Definition: l2_input.h:97
vnet_hw_interface_class_t ethernet_hw_interface_class
uword unformat_ethernet_interface(unformat_input_t *input, va_list *args)
Definition: interface.c:257
static clib_error_t * create_simulated_ethernet_interfaces(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:814
u8 * format_ethernet_header_with_length(u8 *s, va_list *args)
Definition: format.c:97
VNET_HW_INTERFACE_CLASS(ethernet_hw_interface_class)
#define UNFORMAT_END_OF_INPUT
Definition: format.h:145
u16 n_vectors
Definition: node.h:397
vlib_main_t * vm
Definition: buffer.c:323
static_always_inline void vlib_buffer_enqueue_to_next(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u16 *nexts, uword count)
Definition: buffer_node.h:332
#define VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:283
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:57
static uword clib_bitmap_get(uword *ai, uword i)
Gets the ith bit value from a bitmap.
Definition: bitmap.h:197
int vnet_create_loopback_interface(u32 *sw_if_indexp, u8 *mac_address, u8 is_specified, u32 user_instance)
Definition: interface.c:735
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:161
static u8 * format_simulated_ethernet_name(u8 *s, va_list *args)
Definition: interface.c:626
void ethernet_delete_interface(vnet_main_t *vnm, u32 hw_if_index)
Definition: interface.c:324
static uword simulated_ethernet_interface_tx(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Echo packets back to ethernet/l2-input.
Definition: interface.c:393
uword unformat_ethernet_address(unformat_input_t *input, va_list *args)
Definition: format.c:233
#define pool_put_index(p, i)
Free pool element with given index.
Definition: pool.h:311
vlan_table_t * vlan_pool
Definition: ethernet.h:284
#define ASSERT(truth)
u32() ethernet_flag_change_function_t(vnet_main_t *vnm, struct vnet_hw_interface_t *hi, u32 flags)
Definition: ethernet.h:130
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
#define clib_error_report(e)
Definition: error.h:113
vlan_intf_t vlans[ETHERNET_N_VLAN]
Definition: ethernet.h:228
uword * bm_loopback_instances
Definition: ethernet.h:299
u8 mac_address[6]
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
void vnet_delete_hw_interface(vnet_main_t *vnm, u32 hw_if_index)
Definition: interface.c:974
fib_protocol_t ia_nh_proto
The protocol of the neighbor/peer.
Definition: adj.h:249
Definition: defs.h:47
struct vnet_sub_interface_t::@210::@211::@213 flags
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
static void vnet_update_l2_len(vlib_buffer_t *b)
Definition: l2_input.h:236
u32 instance
Definition: gre.api:48
void l2input_interface_mac_change(u32 sw_if_index, const u8 *old_address, const u8 *new_address)
Definition: l2_input.c:562
clib_error_t * vnet_hw_interface_set_flags(vnet_main_t *vnm, u32 hw_if_index, vnet_hw_interface_flags_t flags)
Definition: interface.c:492
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:837
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
u32 ethernet_set_flags(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:372
u8 * ethernet_build_rewrite(vnet_main_t *vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_address)
build a rewrite string to use for sending packets of type &#39;link_type&#39; to &#39;dst_address&#39; ...
Definition: interface.c:81
void vnet_sw_interface_set_mtu(vnet_main_t *vnm, u32 sw_if_index, u32 mtu)
Definition: interface.c:664
struct vnet_sub_interface_t::@210 eth
static void hash_unset_mem_free(uword **h, void *key)
Definition: hash.h:295
#define vnet_buffer(b)
Definition: buffer.h:365
u32 min_supported_packet_bytes
Definition: interface.h:542
vnet_sw_interface_type_t type
Definition: interface.h:701
qinq_table_t * qinq_pool
Definition: ethernet.h:287
#define STRUCT_SIZE_OF(t, f)
Definition: clib.h:68
#define ETHERNET_MAX_PACKET_BYTES
Definition: ethernet.h:133
void vnet_delete_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
Definition: interface.c:626
ethernet_interface_t * ethernet_get_interface(ethernet_main_t *em, u32 hw_if_index)
Definition: interface.c:886
VNET_DEVICE_CLASS(ethernet_simulated_device_class)
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:244
static uword clib_bitmap_first_clear(uword *ai)
Return the lowest numbered clear bit in a bitmap.
Definition: bitmap.h:445
ethernet_interface_t * interfaces
Definition: ethernet.h:272
#define ETHERNET_MIN_PACKET_BYTES
Definition: ethernet.h:132
void ethernet_arp_change_mac(u32 sw_if_index)
Definition: arp.c:2991
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:772
void ethernet_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: interface.c:196
static clib_error_t * delete_sub_interface(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:974
static clib_error_t * simulated_ethernet_mac_change(vnet_hw_interface_t *hi, const u8 *old_address, const u8 *mac_address)
Definition: interface.c:643
static void ethernet_setup_node(vlib_main_t *vm, u32 node_index)
Definition: ethernet.h:365
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:978
Definition: defs.h:46
uword unformat_ethernet_header(unformat_input_t *input, va_list *args)
Definition: format.c:290
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:171