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