src/vnet/interface_output.c

   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  * interface_output.c: interface output node
  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/icmp46_packet.h>
  42 #include <vnet/ethernet/packet.h>
  43 #include <vnet/ip/format.h>
  44 #include <vnet/ip/ip4.h>
  45 #include <vnet/ip/ip6.h>
  46 #include <vnet/udp/udp_packet.h>
  47 #include <vnet/feature/feature.h>
  48 #include <vnet/classify/trace_classify.h>
  49 #include <vnet/interface_output.h>
  50
  51 typedef struct
  52 {
  53   u32 sw_if_index;
  54   u32 flags;
  55   u8 data[128 - 2 * sizeof (u32)];
  56 }
  57 interface_output_trace_t;
  58
  59 #ifndef CLIB_MARCH_VARIANT
  60 u8 *
  61 format_vnet_interface_output_trace (u8 * s, va_list * va)
  62 {
  63   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
  64   vlib_node_t *node = va_arg (*va, vlib_node_t *);
  65   interface_output_trace_t *t = va_arg (*va, interface_output_trace_t *);
  66   vnet_main_t *vnm = vnet_get_main ();
  67   vnet_sw_interface_t *si;
  68   u32 indent;
  69
  70   if (t->sw_if_index != (u32) ~ 0)
  71     {
  72       indent = format_get_indent (s);
  73
  74       if (pool_is_free_index
  75           (vnm->interface_main.sw_interfaces, t->sw_if_index))
  76         {
  77           /* the interface may have been deleted by the time the trace is printed */
  78           s = format (s, "sw_if_index: %d ", t->sw_if_index);
  79         }
  80       else
  81         {
  82           si = vnet_get_sw_interface (vnm, t->sw_if_index);
  83           s =
  84             format (s, "%U ", format_vnet_sw_interface_name, vnm, si,
  85                     t->flags);
  86         }
  87       s =
  88         format (s, "\n%U%U", format_white_space, indent,
  89                 node->format_buffer ? node->format_buffer : format_hex_bytes,
  90                 t->data, sizeof (t->data));
  91     }
  92   return s;
  93 }
  94
  95 static void
  96 vnet_interface_output_trace (vlib_main_t * vm,
  97                              vlib_node_runtime_t * node,
  98                              vlib_frame_t * frame, uword n_buffers)
  99 {
 100   u32 n_left, *from;
 101
 102   n_left = n_buffers;
 103   from = vlib_frame_vector_args (frame);
 104
 105   while (n_left >= 4)
 106     {
 107       u32 bi0, bi1;
 108       vlib_buffer_t *b0, *b1;
 109       interface_output_trace_t *t0, *t1;
 110
 111       /* Prefetch next iteration. */
 112       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 113       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 114
 115       bi0 = from[0];
 116       bi1 = from[1];
 117
 118       b0 = vlib_get_buffer (vm, bi0);
 119       b1 = vlib_get_buffer (vm, bi1);
 120
 121       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 122         {
 123           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 124           t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 125           t0->flags = b0->flags;
 126           clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0),
 127                             sizeof (t0->data));
 128         }
 129       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 130         {
 131           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 132           t1->sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_TX];
 133           t1->flags = b1->flags;
 134           clib_memcpy_fast (t1->data, vlib_buffer_get_current (b1),
 135                             sizeof (t1->data));
 136         }
 137       from += 2;
 138       n_left -= 2;
 139     }
 140
 141   while (n_left >= 1)
 142     {
 143       u32 bi0;
 144       vlib_buffer_t *b0;
 145       interface_output_trace_t *t0;
 146
 147       bi0 = from[0];
 148
 149       b0 = vlib_get_buffer (vm, bi0);
 150
 151       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 152         {
 153           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 154           t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 155           t0->flags = b0->flags;
 156           clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0),
 157                             sizeof (t0->data));
 158         }
 159       from += 1;
 160       n_left -= 1;
 161     }
 162 }
 163
 164 static_always_inline uword
 165 vnet_interface_output_node_inline (vlib_main_t * vm,
 166                                    vlib_node_runtime_t * node,
 167                                    vlib_frame_t * frame,
 168                                    vnet_main_t * vnm,
 169                                    vnet_hw_interface_t * hi,
 170                                    int do_tx_offloads)
 171 {
 172   vnet_interface_output_runtime_t *rt = (void *) node->runtime_data;
 173   vnet_sw_interface_t *si;
 174   u32 n_left_to_tx, *from, *from_end, *to_tx;
 175   u32 n_bytes, n_buffers, n_packets;
 176   u32 n_bytes_b0, n_bytes_b1, n_bytes_b2, n_bytes_b3;
 177   u32 thread_index = vm->thread_index;
 178   vnet_interface_main_t *im = &vnm->interface_main;
 179   u32 next_index = VNET_INTERFACE_OUTPUT_NEXT_TX;
 180   u32 current_config_index = ~0;
 181   u8 arc = im->output_feature_arc_index;
 182   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 183
 184   n_buffers = frame->n_vectors;
 185
 186   if (node->flags & VLIB_NODE_FLAG_TRACE)
 187     vnet_interface_output_trace (vm, node, frame, n_buffers);
 188
 189   from = vlib_frame_vector_args (frame);
 190   vlib_get_buffers (vm, from, b, n_buffers);
 191
 192   if (rt->is_deleted)
 193     return vlib_error_drop_buffers (vm, node, from,
 194                                     /* buffer stride */ 1,
 195                                     n_buffers,
 196                                     VNET_INTERFACE_OUTPUT_NEXT_DROP,
 197                                     node->node_index,
 198                                     VNET_INTERFACE_OUTPUT_ERROR_INTERFACE_DELETED);
 199
 200   si = vnet_get_sw_interface (vnm, rt->sw_if_index);
 201   hi = vnet_get_sup_hw_interface (vnm, rt->sw_if_index);
 202   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ||
 203       !(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
 204     {
 205       vlib_simple_counter_main_t *cm;
 206
 207       cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
 208                              VNET_INTERFACE_COUNTER_TX_ERROR);
 209       vlib_increment_simple_counter (cm, thread_index,
 210                                      rt->sw_if_index, n_buffers);
 211
 212       return vlib_error_drop_buffers (vm, node, from,
 213                                       /* buffer stride */ 1,
 214                                       n_buffers,
 215                                       VNET_INTERFACE_OUTPUT_NEXT_DROP,
 216                                       node->node_index,
 217                                       VNET_INTERFACE_OUTPUT_ERROR_INTERFACE_DOWN);
 218     }
 219
 220   from_end = from + n_buffers;
 221
 222   /* Total byte count of all buffers. */
 223   n_bytes = 0;
 224   n_packets = 0;
 225
 226   /* interface-output feature arc handling */
 227   if (PREDICT_FALSE (vnet_have_features (arc, rt->sw_if_index)))
 228     {
 229       vnet_feature_config_main_t *fcm;
 230       fcm = vnet_feature_get_config_main (arc);
 231       current_config_index = vnet_get_feature_config_index (arc,
 232                                                             rt->sw_if_index);
 233       vnet_get_config_data (&fcm->config_main, &current_config_index,
 234                             &next_index, 0);
 235     }
 236
 237   while (from < from_end)
 238     {
 239       /* Get new next frame since previous incomplete frame may have less
 240          than VNET_FRAME_SIZE vectors in it. */
 241       vlib_get_new_next_frame (vm, node, next_index, to_tx, n_left_to_tx);
 242
 243       while (from + 8 <= from_end && n_left_to_tx >= 4)
 244         {
 245           u32 bi0, bi1, bi2, bi3;
 246           u32 tx_swif0, tx_swif1, tx_swif2, tx_swif3;
 247           u32 or_flags;
 248
 249           /* Prefetch next iteration. */
 250           vlib_prefetch_buffer_header (b[4], LOAD);
 251           vlib_prefetch_buffer_header (b[5], LOAD);
 252           vlib_prefetch_buffer_header (b[6], LOAD);
 253           vlib_prefetch_buffer_header (b[7], LOAD);
 254
 255           bi0 = from[0];
 256           bi1 = from[1];
 257           bi2 = from[2];
 258           bi3 = from[3];
 259           to_tx[0] = bi0;
 260           to_tx[1] = bi1;
 261           to_tx[2] = bi2;
 262           to_tx[3] = bi3;
 263
 264           or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
 265
 266           from += 4;
 267           to_tx += 4;
 268           n_left_to_tx -= 4;
 269
 270           /* Be grumpy about zero length buffers for benefit of
 271              driver tx function. */
 272           ASSERT (b[0]->current_length > 0);
 273           ASSERT (b[1]->current_length > 0);
 274           ASSERT (b[2]->current_length > 0);
 275           ASSERT (b[3]->current_length > 0);
 276
 277           n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 278           n_bytes_b1 = vlib_buffer_length_in_chain (vm, b[1]);
 279           n_bytes_b2 = vlib_buffer_length_in_chain (vm, b[2]);
 280           n_bytes_b3 = vlib_buffer_length_in_chain (vm, b[3]);
 281           tx_swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 282           tx_swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 283           tx_swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
 284           tx_swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
 285
 286           n_bytes += n_bytes_b0 + n_bytes_b1;
 287           n_bytes += n_bytes_b2 + n_bytes_b3;
 288           n_packets += 4;
 289
 290           if (PREDICT_FALSE (current_config_index != ~0))
 291             {
 292               vnet_buffer (b[0])->feature_arc_index = arc;
 293               vnet_buffer (b[1])->feature_arc_index = arc;
 294               vnet_buffer (b[2])->feature_arc_index = arc;
 295               vnet_buffer (b[3])->feature_arc_index = arc;
 296               b[0]->current_config_index = current_config_index;
 297               b[1]->current_config_index = current_config_index;
 298               b[2]->current_config_index = current_config_index;
 299               b[3]->current_config_index = current_config_index;
 300             }
 301
 302           /* update vlan subif tx counts, if required */
 303           if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index))
 304             {
 305               vlib_increment_combined_counter (im->combined_sw_if_counters +
 306                                                VNET_INTERFACE_COUNTER_TX,
 307                                                thread_index, tx_swif0, 1,
 308                                                n_bytes_b0);
 309             }
 310
 311           if (PREDICT_FALSE (tx_swif1 != rt->sw_if_index))
 312             {
 313
 314               vlib_increment_combined_counter (im->combined_sw_if_counters +
 315                                                VNET_INTERFACE_COUNTER_TX,
 316                                                thread_index, tx_swif1, 1,
 317                                                n_bytes_b1);
 318             }
 319
 320           if (PREDICT_FALSE (tx_swif2 != rt->sw_if_index))
 321             {
 322
 323               vlib_increment_combined_counter (im->combined_sw_if_counters +
 324                                                VNET_INTERFACE_COUNTER_TX,
 325                                                thread_index, tx_swif2, 1,
 326                                                n_bytes_b2);
 327             }
 328           if (PREDICT_FALSE (tx_swif3 != rt->sw_if_index))
 329             {
 330
 331               vlib_increment_combined_counter (im->combined_sw_if_counters +
 332                                                VNET_INTERFACE_COUNTER_TX,
 333                                                thread_index, tx_swif3, 1,
 334                                                n_bytes_b3);
 335             }
 336
 337           if (do_tx_offloads)
 338             {
 339               u32 vnet_buffer_offload_flags =
 340                 (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
 341                  VNET_BUFFER_F_OFFLOAD_UDP_CKSUM |
 342                  VNET_BUFFER_F_OFFLOAD_IP_CKSUM);
 343               if (or_flags & vnet_buffer_offload_flags)
 344                 {
 345                   if (b[0]->flags & vnet_buffer_offload_flags)
 346                     vnet_calc_checksums_inline
 347                       (vm, b[0],
 348                        b[0]->flags & VNET_BUFFER_F_IS_IP4,
 349                        b[0]->flags & VNET_BUFFER_F_IS_IP6);
 350                   if (b[1]->flags & vnet_buffer_offload_flags)
 351                     vnet_calc_checksums_inline
 352                       (vm, b[1],
 353                        b[1]->flags & VNET_BUFFER_F_IS_IP4,
 354                        b[1]->flags & VNET_BUFFER_F_IS_IP6);
 355                   if (b[2]->flags & vnet_buffer_offload_flags)
 356                     vnet_calc_checksums_inline
 357                       (vm, b[2],
 358                        b[2]->flags & VNET_BUFFER_F_IS_IP4,
 359                        b[2]->flags & VNET_BUFFER_F_IS_IP6);
 360                   if (b[3]->flags & vnet_buffer_offload_flags)
 361                     vnet_calc_checksums_inline
 362                       (vm, b[3],
 363                        b[3]->flags & VNET_BUFFER_F_IS_IP4,
 364                        b[3]->flags & VNET_BUFFER_F_IS_IP6);
 365                 }
 366             }
 367           b += 4;
 368
 369         }
 370
 371       while (from + 1 <= from_end && n_left_to_tx >= 1)
 372         {
 373           u32 bi0;
 374           u32 tx_swif0;
 375
 376           bi0 = from[0];
 377           to_tx[0] = bi0;
 378           from += 1;
 379           to_tx += 1;
 380           n_left_to_tx -= 1;
 381
 382           /* Be grumpy about zero length buffers for benefit of
 383              driver tx function. */
 384           ASSERT (b[0]->current_length > 0);
 385
 386           n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 387           tx_swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 388           n_bytes += n_bytes_b0;
 389           n_packets += 1;
 390
 391           if (PREDICT_FALSE (current_config_index != ~0))
 392             {
 393               vnet_buffer (b[0])->feature_arc_index = arc;
 394               b[0]->current_config_index = current_config_index;
 395             }
 396
 397           if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index))
 398             {
 399
 400               vlib_increment_combined_counter (im->combined_sw_if_counters +
 401                                                VNET_INTERFACE_COUNTER_TX,
 402                                                thread_index, tx_swif0, 1,
 403                                                n_bytes_b0);
 404             }
 405
 406           if (do_tx_offloads)
 407             {
 408               if (b[0]->flags &
 409                   (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
 410                    VNET_BUFFER_F_OFFLOAD_UDP_CKSUM |
 411                    VNET_BUFFER_F_OFFLOAD_IP_CKSUM))
 412                 vnet_calc_checksums_inline
 413                   (vm, b[0],
 414                    b[0]->flags & VNET_BUFFER_F_IS_IP4,
 415                    b[0]->flags & VNET_BUFFER_F_IS_IP6);
 416             }
 417           b += 1;
 418         }
 419
 420       vlib_put_next_frame (vm, node, next_index, n_left_to_tx);
 421     }
 422
 423   /* Update main interface stats. */
 424   vlib_increment_combined_counter (im->combined_sw_if_counters
 425                                    + VNET_INTERFACE_COUNTER_TX,
 426                                    thread_index,
 427                                    rt->sw_if_index, n_packets, n_bytes);
 428   return n_buffers;
 429 }
 430 #endif /* CLIB_MARCH_VARIANT */
 431
 432 static_always_inline void vnet_interface_pcap_tx_trace
 433   (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame,
 434    int sw_if_index_from_buffer)
 435 {
 436   u32 n_left_from, *from;
 437   u32 sw_if_index;
 438   vnet_pcap_t *pp = &vlib_global_main.pcap;
 439
 440   if (PREDICT_TRUE (pp->pcap_tx_enable == 0))
 441     return;
 442
 443   if (sw_if_index_from_buffer == 0)
 444     {
 445       vnet_interface_output_runtime_t *rt = (void *) node->runtime_data;
 446       sw_if_index = rt->sw_if_index;
 447     }
 448   else
 449     sw_if_index = ~0;
 450
 451   n_left_from = frame->n_vectors;
 452   from = vlib_frame_vector_args (frame);
 453
 454   while (n_left_from > 0)
 455     {
 456       int classify_filter_result;
 457       u32 bi0 = from[0];
 458       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 459       from++;
 460       n_left_from--;
 461
 462       if (pp->filter_classify_table_index != ~0)
 463         {
 464           classify_filter_result =
 465             vnet_is_packet_traced_inline
 466             (b0, pp->filter_classify_table_index, 0 /* full classify */ );
 467           if (classify_filter_result)
 468             pcap_add_buffer (&pp->pcap_main, vm, bi0, pp->max_bytes_per_pkt);
 469           continue;
 470         }
 471
 472       if (sw_if_index_from_buffer)
 473         sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 474
 475       if (pp->pcap_sw_if_index == 0 || pp->pcap_sw_if_index == sw_if_index)
 476         {
 477           vnet_main_t *vnm = vnet_get_main ();
 478           vnet_hw_interface_t *hi =
 479             vnet_get_sup_hw_interface (vnm, sw_if_index);
 480           /* Capture pkt if not filtered, or if filter hits */
 481           if (hi->trace_classify_table_index == ~0 ||
 482               vnet_is_packet_traced_inline
 483               (b0, hi->trace_classify_table_index, 0 /* full classify */ ))
 484             pcap_add_buffer (&pp->pcap_main, vm, bi0, pp->max_bytes_per_pkt);
 485         }
 486     }
 487 }
 488
 489 #ifndef CLIB_MARCH_VARIANT
 490
 491 uword
 492 vnet_interface_output_node (vlib_main_t * vm, vlib_node_runtime_t * node,
 493                             vlib_frame_t * frame)
 494 {
 495   vnet_main_t *vnm = vnet_get_main ();
 496   vnet_hw_interface_t *hi;
 497   vnet_interface_output_runtime_t *rt = (void *) node->runtime_data;
 498   hi = vnet_get_sup_hw_interface (vnm, rt->sw_if_index);
 499
 500   vnet_interface_pcap_tx_trace (vm, node, frame,
 501                                 0 /* sw_if_index_from_buffer */ );
 502
 503   if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD)
 504     return vnet_interface_output_node_inline (vm, node, frame, vnm, hi,
 505                                               /* do_tx_offloads */ 0);
 506   else
 507     return vnet_interface_output_node_inline (vm, node, frame, vnm, hi,
 508                                               /* do_tx_offloads */ 1);
 509 }
 510 #endif /* CLIB_MARCH_VARIANT */
 511
 512 /* Use buffer's sw_if_index[VNET_TX] to choose output interface. */
 513 VLIB_NODE_FN (vnet_per_buffer_interface_output_node) (vlib_main_t * vm,
 514                                                       vlib_node_runtime_t *
 515                                                       node,
 516                                                       vlib_frame_t * frame)
 517 {
 518   vnet_main_t *vnm = vnet_get_main ();
 519   u32 n_left_to_next, *from, *to_next;
 520   u32 n_left_from, next_index;
 521
 522   vnet_interface_pcap_tx_trace (vm, node, frame,
 523                                 1 /* sw_if_index_from_buffer */ );
 524
 525   n_left_from = frame->n_vectors;
 526
 527   from = vlib_frame_vector_args (frame);
 528   next_index = node->cached_next_index;
 529
 530   while (n_left_from > 0)
 531     {
 532       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 533
 534       while (n_left_from >= 4 && n_left_to_next >= 2)
 535         {
 536           u32 bi0, bi1, next0, next1;
 537           vlib_buffer_t *b0, *b1;
 538           vnet_hw_interface_t *hi0, *hi1;
 539
 540           /* Prefetch next iteration. */
 541           vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 542           vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 543
 544           bi0 = from[0];
 545           bi1 = from[1];
 546           to_next[0] = bi0;
 547           to_next[1] = bi1;
 548           from += 2;
 549           to_next += 2;
 550           n_left_to_next -= 2;
 551           n_left_from -= 2;
 552
 553           b0 = vlib_get_buffer (vm, bi0);
 554           b1 = vlib_get_buffer (vm, bi1);
 555
 556           hi0 =
 557             vnet_get_sup_hw_interface (vnm,
 558                                        vnet_buffer (b0)->sw_if_index
 559                                        [VLIB_TX]);
 560           hi1 =
 561             vnet_get_sup_hw_interface (vnm,
 562                                        vnet_buffer (b1)->sw_if_index
 563                                        [VLIB_TX]);
 564
 565           next0 = hi0->output_node_next_index;
 566           next1 = hi1->output_node_next_index;
 567
 568           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
 569                                            n_left_to_next, bi0, bi1, next0,
 570                                            next1);
 571         }
 572
 573       while (n_left_from > 0 && n_left_to_next > 0)
 574         {
 575           u32 bi0, next0;
 576           vlib_buffer_t *b0;
 577           vnet_hw_interface_t *hi0;
 578
 579           bi0 = from[0];
 580           to_next[0] = bi0;
 581           from += 1;
 582           to_next += 1;
 583           n_left_to_next -= 1;
 584           n_left_from -= 1;
 585
 586           b0 = vlib_get_buffer (vm, bi0);
 587
 588           hi0 =
 589             vnet_get_sup_hw_interface (vnm,
 590                                        vnet_buffer (b0)->sw_if_index
 591                                        [VLIB_TX]);
 592
 593           next0 = hi0->output_node_next_index;
 594
 595           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 596                                            n_left_to_next, bi0, next0);
 597         }
 598
 599       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 600     }
 601
 602   return frame->n_vectors;
 603 }
 604
 605 typedef struct vnet_error_trace_t_
 606 {
 607   u32 sw_if_index;
 608   i8 details_valid;
 609   u8 is_ip6;
 610   u8 pad[2];
 611   u16 mactype;
 612   ip46_address_t src, dst;
 613 } vnet_error_trace_t;
 614
 615 static u8 *
 616 format_vnet_error_trace (u8 * s, va_list * va)
 617 {
 618   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
 619   CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
 620   vnet_error_trace_t *t = va_arg (*va, vnet_error_trace_t *);
 621
 622   /* Normal, non-catchup trace */
 623   if (t->details_valid == 0)
 624     {
 625       s = format (s, "rx:%U", format_vnet_sw_if_index_name,
 626                   vnet_get_main (), t->sw_if_index);
 627     }
 628   else if (t->details_valid == 1)
 629     {
 630       /* The trace capture code didn't understant the mactype */
 631       s = format (s, "mactype 0x%4x (not decoded)", t->mactype);
 632     }
 633   else if (t->details_valid == 2)
 634     {
 635       /* Dump the src/dst addresses */
 636       if (t->is_ip6 == 0)
 637         s = format (s, "IP4: %U -> %U",
 638                     format_ip4_address, &t->src.ip4,
 639                     format_ip4_address, &t->dst.ip4);
 640       else
 641         s = format (s, "IP6: %U -> %U",
 642                     format_ip6_address, &t->src.ip6,
 643                     format_ip6_address, &t->dst.ip6);
 644     }
 645   return s;
 646 }
 647
 648 static void
 649 interface_trace_buffers (vlib_main_t * vm,
 650                          vlib_node_runtime_t * node, vlib_frame_t * frame)
 651 {
 652   u32 n_left, *buffers;
 653
 654   buffers = vlib_frame_vector_args (frame);
 655   n_left = frame->n_vectors;
 656
 657   while (n_left >= 4)
 658     {
 659       u32 bi0, bi1;
 660       vlib_buffer_t *b0, *b1;
 661       vnet_error_trace_t *t0, *t1;
 662
 663       /* Prefetch next iteration. */
 664       vlib_prefetch_buffer_with_index (vm, buffers[2], LOAD);
 665       vlib_prefetch_buffer_with_index (vm, buffers[3], LOAD);
 666
 667       bi0 = buffers[0];
 668       bi1 = buffers[1];
 669
 670       b0 = vlib_get_buffer (vm, bi0);
 671       b1 = vlib_get_buffer (vm, bi1);
 672
 673       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 674         {
 675           t0 = vlib_add_trace (vm, node, b0,
 676                                STRUCT_OFFSET_OF (vnet_error_trace_t, pad));
 677           t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 678           t0->details_valid = 0;
 679         }
 680       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 681         {
 682           t1 = vlib_add_trace (vm, node, b1,
 683                                STRUCT_OFFSET_OF (vnet_error_trace_t, pad));
 684           t1->sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_RX];
 685           t1->details_valid = 0;
 686         }
 687       buffers += 2;
 688       n_left -= 2;
 689     }
 690
 691   while (n_left >= 1)
 692     {
 693       u32 bi0;
 694       vlib_buffer_t *b0;
 695       vnet_error_trace_t *t0;
 696
 697       bi0 = buffers[0];
 698
 699       b0 = vlib_get_buffer (vm, bi0);
 700
 701       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 702         {
 703           t0 = vlib_add_trace (vm, node, b0,
 704                                STRUCT_OFFSET_OF (vnet_error_trace_t, pad));
 705           t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 706           t0->details_valid = 0;
 707         }
 708       buffers += 1;
 709       n_left -= 1;
 710     }
 711 }
 712
 713 typedef enum
 714 {
 715   VNET_ERROR_DISPOSITION_DROP,
 716   VNET_ERROR_DISPOSITION_PUNT,
 717   VNET_ERROR_N_DISPOSITION,
 718 } vnet_error_disposition_t;
 719
 720 static void
 721 drop_catchup_trace (vlib_main_t * vm,
 722                     vlib_node_runtime_t * node, vlib_buffer_t * b)
 723 {
 724   /* Can we safely rewind the buffer? If not, fagedaboudit */
 725   if (b->flags & VNET_BUFFER_F_L2_HDR_OFFSET_VALID)
 726     {
 727       vnet_error_trace_t *t;
 728       ip4_header_t *ip4;
 729       ip6_header_t *ip6;
 730       ethernet_header_t *eh;
 731       i16 delta;
 732
 733       t = vlib_add_trace (vm, node, b, sizeof (*t));
 734       delta = vnet_buffer (b)->l2_hdr_offset - b->current_data;
 735       vlib_buffer_advance (b, delta);
 736
 737       eh = vlib_buffer_get_current (b);
 738       /* Save mactype */
 739       t->mactype = clib_net_to_host_u16 (eh->type);
 740       t->details_valid = 1;
 741       switch (t->mactype)
 742         {
 743         case ETHERNET_TYPE_IP4:
 744           ip4 = (void *) (eh + 1);
 745           t->details_valid = 2;
 746           t->is_ip6 = 0;
 747           t->src.ip4.as_u32 = ip4->src_address.as_u32;
 748           t->dst.ip4.as_u32 = ip4->dst_address.as_u32;
 749           break;
 750
 751         case ETHERNET_TYPE_IP6:
 752           ip6 = (void *) (eh + 1);
 753           t->details_valid = 2;
 754           t->is_ip6 = 1;
 755           clib_memcpy_fast (t->src.as_u8, ip6->src_address.as_u8,
 756                             sizeof (ip6_address_t));
 757           clib_memcpy_fast (t->dst.as_u8, ip6->dst_address.as_u8,
 758                             sizeof (ip6_address_t));
 759           break;
 760
 761         default:
 762           /* Dunno, do nothing, leave details_valid alone */
 763           break;
 764         }
 765       /* Restore current data (probably unnecessary) */
 766       vlib_buffer_advance (b, -delta);
 767     }
 768 }
 769
 770 static_always_inline uword
 771 interface_drop_punt (vlib_main_t * vm,
 772                      vlib_node_runtime_t * node,
 773                      vlib_frame_t * frame,
 774                      vnet_error_disposition_t disposition)
 775 {
 776   u32 *from, n_left, thread_index, *sw_if_index;
 777   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
 778   u32 sw_if_indices[VLIB_FRAME_SIZE];
 779   vlib_simple_counter_main_t *cm;
 780   u16 nexts[VLIB_FRAME_SIZE];
 781   u32 n_trace;
 782   vnet_main_t *vnm;
 783
 784   vnm = vnet_get_main ();
 785   thread_index = vm->thread_index;
 786   from = vlib_frame_vector_args (frame);
 787   n_left = frame->n_vectors;
 788   b = bufs;
 789   sw_if_index = sw_if_indices;
 790
 791   vlib_get_buffers (vm, from, bufs, n_left);
 792
 793   /* "trace add error-drop NNN?" */
 794   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 795     {
 796       /* If pkts aren't otherwise traced... */
 797       if ((node->flags & VLIB_NODE_FLAG_TRACE) == 0)
 798         {
 799           /* Trace them from here */
 800           node->flags |= VLIB_NODE_FLAG_TRACE;
 801           while (n_trace && n_left)
 802             {
 803               if (PREDICT_TRUE
 804                   (vlib_trace_buffer (vm, node, 0 /* next_index */ , b[0],
 805                                       0 /* follow chain */ )))
 806                 {
 807                   /*
 808                    * Here we have a wireshark dissector problem.
 809                    * Packets may be well-formed, or not. We
 810                    * must not blow chunks in any case.
 811                    *
 812                    * Try to produce trace records which will help
 813                    * folks understand what's going on.
 814                    */
 815                   drop_catchup_trace (vm, node, b[0]);
 816                   n_trace--;
 817                 }
 818               n_left--;
 819               b++;
 820             }
 821         }
 822
 823       vlib_set_trace_count (vm, node, n_trace);
 824       b = bufs;
 825       n_left = frame->n_vectors;
 826     }
 827
 828   if (node->flags & VLIB_NODE_FLAG_TRACE)
 829     interface_trace_buffers (vm, node, frame);
 830
 831   /* All going to drop regardless, this is just a counting exercise */
 832   clib_memset (nexts, 0, sizeof (nexts));
 833
 834   cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
 835                          (disposition == VNET_ERROR_DISPOSITION_PUNT
 836                           ? VNET_INTERFACE_COUNTER_PUNT
 837                           : VNET_INTERFACE_COUNTER_DROP));
 838
 839   /* collect the array of interfaces first ... */
 840   while (n_left >= 4)
 841     {
 842       if (n_left >= 12)
 843         {
 844           /* Prefetch 8 ahead - there's not much going on in each iteration */
 845           vlib_prefetch_buffer_header (b[4], LOAD);
 846           vlib_prefetch_buffer_header (b[5], LOAD);
 847           vlib_prefetch_buffer_header (b[6], LOAD);
 848           vlib_prefetch_buffer_header (b[7], LOAD);
 849         }
 850       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 851       sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
 852       sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
 853       sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
 854
 855       sw_if_index += 4;
 856       n_left -= 4;
 857       b += 4;
 858     }
 859   while (n_left)
 860     {
 861       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 862
 863       sw_if_index += 1;
 864       n_left -= 1;
 865       b += 1;
 866     }
 867
 868   /* ... then count against them in blocks */
 869   n_left = frame->n_vectors;
 870
 871   while (n_left)
 872     {
 873       vnet_sw_interface_t *sw_if0;
 874       u16 off, count;
 875
 876       off = frame->n_vectors - n_left;
 877
 878       sw_if_index = sw_if_indices + off;
 879
 880       count = clib_count_equal_u32 (sw_if_index, n_left);
 881       n_left -= count;
 882
 883       vlib_increment_simple_counter (cm, thread_index, sw_if_index[0], count);
 884
 885       /* Increment super-interface drop/punt counters for
 886          sub-interfaces. */
 887       sw_if0 = vnet_get_sw_interface (vnm, sw_if_index[0]);
 888       if (sw_if0->sup_sw_if_index != sw_if_index[0])
 889         vlib_increment_simple_counter
 890           (cm, thread_index, sw_if0->sup_sw_if_index, count);
 891     }
 892
 893   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 894
 895   return frame->n_vectors;
 896 }
 897
 898 static inline void
 899 pcap_drop_trace (vlib_main_t * vm,
 900                  vnet_interface_main_t * im,
 901                  vnet_pcap_t * pp, vlib_frame_t * f)
 902 {
 903   u32 *from;
 904   u32 n_left = f->n_vectors;
 905   vlib_buffer_t *b0, *p1;
 906   u32 bi0;
 907   i16 save_current_data;
 908   u16 save_current_length;
 909   vlib_error_main_t *em = &vm->error_main;
 910   int do_trace = 0;
 911
 912
 913   from = vlib_frame_vector_args (f);
 914
 915   while (n_left > 0)
 916     {
 917       if (PREDICT_TRUE (n_left > 1))
 918         {
 919           p1 = vlib_get_buffer (vm, from[1]);
 920           vlib_prefetch_buffer_header (p1, LOAD);
 921         }
 922
 923       bi0 = from[0];
 924       b0 = vlib_get_buffer (vm, bi0);
 925       from++;
 926       n_left--;
 927
 928       /* See if we're pointedly ignoring this specific error */
 929       if (im->pcap_drop_filter_hash
 930           && hash_get (im->pcap_drop_filter_hash, b0->error))
 931         continue;
 932
 933       do_trace = (pp->pcap_sw_if_index == 0) ||
 934         pp->pcap_sw_if_index == vnet_buffer (b0)->sw_if_index[VLIB_RX];
 935
 936       if (PREDICT_FALSE
 937           (do_trace == 0 && pp->filter_classify_table_index != ~0))
 938         {
 939           do_trace = vnet_is_packet_traced_inline
 940             (b0, pp->filter_classify_table_index, 0 /* full classify */ );
 941         }
 942
 943       /* Trace all drops, or drops received on a specific interface */
 944       if (do_trace)
 945         {
 946           save_current_data = b0->current_data;
 947           save_current_length = b0->current_length;
 948
 949           /*
 950            * Typically, we'll need to rewind the buffer
 951            * if l2_hdr_offset is valid, make sure to rewind to the start of
 952            * the L2 header. This may not be the buffer start in case we pop-ed
 953            * vlan tags.
 954            * Otherwise, rewind to buffer start and hope for the best.
 955            */
 956           if (b0->flags & VNET_BUFFER_F_L2_HDR_OFFSET_VALID)
 957             {
 958               if (b0->current_data > vnet_buffer (b0)->l2_hdr_offset)
 959                 vlib_buffer_advance (b0,
 960                                      vnet_buffer (b0)->l2_hdr_offset -
 961                                      b0->current_data);
 962             }
 963           else if (b0->current_data > 0)
 964             vlib_buffer_advance (b0, (word) - b0->current_data);
 965
 966           {
 967             vlib_buffer_t *last = b0;
 968             u32 error_node_index;
 969             int drop_string_len;
 970             vlib_node_t *n;
 971             /* Length of the error string */
 972             int error_string_len =
 973               clib_strnlen (em->counters_heap[b0->error].name, 128);
 974
 975             /* Dig up the drop node */
 976             error_node_index = vm->node_main.node_by_error[b0->error];
 977             n = vlib_get_node (vm, error_node_index);
 978
 979             /* Length of full drop string, w/ "nodename: " prepended */
 980             drop_string_len = error_string_len + vec_len (n->name) + 2;
 981
 982             /* Find the last buffer in the chain */
 983             while (last->flags & VLIB_BUFFER_NEXT_PRESENT)
 984               last = vlib_get_buffer (vm, last->next_buffer);
 985
 986             /*
 987              * Append <nodename>: <error-string> to the capture,
 988              * only if we can do that without allocating a new buffer.
 989              */
 990             if (PREDICT_TRUE ((last->current_data + last->current_length)
 991                               < (VLIB_BUFFER_DEFAULT_DATA_SIZE
 992                                  - drop_string_len)))
 993               {
 994                 clib_memcpy_fast (last->data + last->current_data +
 995                                   last->current_length, n->name,
 996                                   vec_len (n->name));
 997                 clib_memcpy_fast (last->data + last->current_data +
 998                                   last->current_length + vec_len (n->name),
 999                                   ": ", 2);
1000                 clib_memcpy_fast (last->data + last->current_data +
1001                                   last->current_length + vec_len (n->name) +
1002                                   2, em->counters_heap[b0->error].name,
1003                                   error_string_len);
1004                 last->current_length += drop_string_len;
1005                 b0->flags &= ~(VLIB_BUFFER_TOTAL_LENGTH_VALID);
1006                 pcap_add_buffer (&pp->pcap_main, vm, bi0,
1007                                  pp->max_bytes_per_pkt);
1008                 last->current_length -= drop_string_len;
1009                 b0->current_data = save_current_data;
1010                 b0->current_length = save_current_length;
1011                 continue;
1012               }
1013           }
1014
1015           /*
1016            * Didn't have space in the last buffer, here's the dropped
1017            * packet as-is
1018            */
1019           pcap_add_buffer (&pp->pcap_main, vm, bi0, pp->max_bytes_per_pkt);
1020
1021           b0->current_data = save_current_data;
1022           b0->current_length = save_current_length;
1023         }
1024     }
1025 }
1026
1027 #ifndef CLIB_MARCH_VARIANT
1028 void
1029 vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add)
1030 {
1031   vnet_interface_main_t *im = &vnet_get_main ()->interface_main;
1032
1033   if (im->pcap_drop_filter_hash == 0)
1034     im->pcap_drop_filter_hash = hash_create (0, sizeof (uword));
1035
1036   if (is_add)
1037     hash_set (im->pcap_drop_filter_hash, error_index, 1);
1038   else
1039     hash_unset (im->pcap_drop_filter_hash, error_index);
1040 }
1041 #endif /* CLIB_MARCH_VARIANT */
1042
1043 VLIB_NODE_FN (interface_drop) (vlib_main_t * vm,
1044                                vlib_node_runtime_t * node,
1045                                vlib_frame_t * frame)
1046 {
1047   vnet_interface_main_t *im = &vnet_get_main ()->interface_main;
1048   vnet_pcap_t *pp = &vlib_global_main.pcap;
1049
1050   if (PREDICT_FALSE (pp->pcap_drop_enable))
1051     pcap_drop_trace (vm, im, pp, frame);
1052
1053   return interface_drop_punt (vm, node, frame, VNET_ERROR_DISPOSITION_DROP);
1054 }
1055
1056 VLIB_NODE_FN (interface_punt) (vlib_main_t * vm,
1057                                vlib_node_runtime_t * node,
1058                                vlib_frame_t * frame)
1059 {
1060   return interface_drop_punt (vm, node, frame, VNET_ERROR_DISPOSITION_PUNT);
1061 }
1062
1063 /* *INDENT-OFF* */
1064 VLIB_REGISTER_NODE (interface_drop) = {
1065   .name = "error-drop",
1066   .vector_size = sizeof (u32),
1067   .format_trace = format_vnet_error_trace,
1068   .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1069   .n_next_nodes = 1,
1070   .next_nodes = {
1071     [0] = "drop",
1072   },
1073 };
1074 /* *INDENT-ON* */
1075
1076 /* *INDENT-OFF* */
1077 VLIB_REGISTER_NODE (interface_punt) = {
1078   .name = "error-punt",
1079   .vector_size = sizeof (u32),
1080   .format_trace = format_vnet_error_trace,
1081   .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1082   .n_next_nodes = 1,
1083   .next_nodes = {
1084     [0] = "punt",
1085   },
1086 };
1087 /* *INDENT-ON* */
1088
1089 /* *INDENT-OFF* */
1090 VLIB_REGISTER_NODE (vnet_per_buffer_interface_output_node) = {
1091   .name = "interface-output",
1092   .vector_size = sizeof (u32),
1093 };
1094 /* *INDENT-ON* */
1095
1096 static uword
1097 interface_tx_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1098                       vlib_frame_t * from_frame)
1099 {
1100   vnet_main_t *vnm = vnet_get_main ();
1101   u32 last_sw_if_index = ~0;
1102   vlib_frame_t *to_frame = 0;
1103   vnet_hw_interface_t *hw = 0;
1104   u32 *from, *to_next = 0;
1105   u32 n_left_from;
1106
1107   from = vlib_frame_vector_args (from_frame);
1108   n_left_from = from_frame->n_vectors;
1109   while (n_left_from > 0)
1110     {
1111       u32 bi0;
1112       vlib_buffer_t *b0;
1113       u32 sw_if_index0;
1114
1115       bi0 = from[0];
1116       from++;
1117       n_left_from--;
1118       b0 = vlib_get_buffer (vm, bi0);
1119       sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
1120
1121       if (PREDICT_FALSE ((last_sw_if_index != sw_if_index0) || to_frame == 0))
1122         {
1123           if (to_frame)
1124             {
1125               hw = vnet_get_sup_hw_interface (vnm, last_sw_if_index);
1126               vlib_put_frame_to_node (vm, hw->tx_node_index, to_frame);
1127             }
1128           last_sw_if_index = sw_if_index0;
1129           hw = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1130           to_frame = vlib_get_frame_to_node (vm, hw->tx_node_index);
1131           to_next = vlib_frame_vector_args (to_frame);
1132         }
1133
1134       to_next[0] = bi0;
1135       to_next++;
1136       to_frame->n_vectors++;
1137     }
1138   vlib_put_frame_to_node (vm, hw->tx_node_index, to_frame);
1139   return from_frame->n_vectors;
1140 }
1141
1142 /* *INDENT-OFF* */
1143 VLIB_REGISTER_NODE (interface_tx) = {
1144   .function = interface_tx_node_fn,
1145   .name = "interface-tx",
1146   .vector_size = sizeof (u32),
1147   .n_next_nodes = 1,
1148   .next_nodes = {
1149     [0] = "error-drop",
1150   },
1151 };
1152
1153 VNET_FEATURE_ARC_INIT (interface_output, static) =
1154 {
1155   .arc_name  = "interface-output",
1156   .start_nodes = VNET_FEATURES (0),
1157   .last_in_arc = "interface-tx",
1158   .arc_index_ptr = &vnet_main.interface_main.output_feature_arc_index,
1159 };
1160
1161 VNET_FEATURE_INIT (span_tx, static) = {
1162   .arc_name = "interface-output",
1163   .node_name = "span-output",
1164   .runs_before = VNET_FEATURES ("interface-tx"),
1165 };
1166
1167 VNET_FEATURE_INIT (ipsec_if_tx, static) = {
1168   .arc_name = "interface-output",
1169   .node_name = "ipsec-if-output",
1170   .runs_before = VNET_FEATURES ("interface-tx"),
1171 };
1172
1173 VNET_FEATURE_INIT (interface_tx, static) = {
1174   .arc_name = "interface-output",
1175   .node_name = "interface-tx",
1176   .runs_before = 0,
1177 };
1178 /* *INDENT-ON* */
1179
1180 #ifndef CLIB_MARCH_VARIANT
1181 clib_error_t *
1182 vnet_per_buffer_interface_output_hw_interface_add_del (vnet_main_t * vnm,
1183                                                        u32 hw_if_index,
1184                                                        u32 is_create)
1185 {
1186   vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
1187   u32 next_index;
1188
1189   if (hi->output_node_index == 0)
1190     return 0;
1191
1192   next_index = vlib_node_add_next
1193     (vnm->vlib_main, vnet_per_buffer_interface_output_node.index,
1194      hi->output_node_index);
1195   hi->output_node_next_index = next_index;
1196
1197   return 0;
1198 }
1199
1200 VNET_HW_INTERFACE_ADD_DEL_FUNCTION
1201   (vnet_per_buffer_interface_output_hw_interface_add_del);
1202
1203 void
1204 vnet_set_interface_output_node (vnet_main_t * vnm,
1205                                 u32 hw_if_index, u32 node_index)
1206 {
1207   ASSERT (node_index);
1208   vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
1209   u32 next_index = vlib_node_add_next
1210     (vnm->vlib_main, vnet_per_buffer_interface_output_node.index, node_index);
1211   hi->output_node_next_index = next_index;
1212   hi->output_node_index = node_index;
1213 }
1214 #endif /* CLIB_MARCH_VARIANT */
1215
1216 /*
1217  * fd.io coding-style-patch-verification: ON
1218  *
1219  * Local Variables:
1220  * eval: (c-set-style "gnu")
1221  * End:
1222  */