src/vnet/devices/af_packet/node.c

   1 /*
   2  *------------------------------------------------------------------
   3  * af_packet.c - linux kernel packet interface
   4  *
   5  * Copyright (c) 2016 Cisco and/or its affiliates.
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at:
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *------------------------------------------------------------------
  18  */
  19
  20 #include <linux/if_packet.h>
  21
  22 #include <vlib/vlib.h>
  23 #include <vlib/unix/unix.h>
  24 #include <vnet/ip/ip.h>
  25 #include <vnet/ethernet/ethernet.h>
  26 #include <vnet/interface/rx_queue_funcs.h>
  27 #include <vnet/feature/feature.h>
  28 #include <vnet/ethernet/packet.h>
  29
  30 #include <vnet/devices/af_packet/af_packet.h>
  31 #include <vnet/devices/virtio/virtio_std.h>
  32
  33 #define foreach_af_packet_input_error                                         \
  34   _ (PARTIAL_PKT, "partial packet")                                           \
  35   _ (TIMEDOUT_BLK, "timed out block")                                         \
  36   _ (TOTAL_RECV_BLK, "total received block")
  37 typedef enum
  38 {
  39 #define _(f,s) AF_PACKET_INPUT_ERROR_##f,
  40   foreach_af_packet_input_error
  41 #undef _
  42     AF_PACKET_INPUT_N_ERROR,
  43 } af_packet_input_error_t;
  44
  45 static char *af_packet_input_error_strings[] = {
  46 #define _(n,s) s,
  47   foreach_af_packet_input_error
  48 #undef _
  49 };
  50
  51 typedef struct
  52 {
  53   u32 next_index;
  54   u32 hw_if_index;
  55   u16 queue_id;
  56   int block;
  57   u32 pkt_num;
  58   void *block_start;
  59   block_desc_t bd;
  60   tpacket3_hdr_t tph;
  61   vnet_virtio_net_hdr_t vnet_hdr;
  62 } af_packet_input_trace_t;
  63
  64 static u8 *
  65 format_af_packet_input_trace (u8 * s, va_list * args)
  66 {
  67   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  68   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  69   af_packet_input_trace_t *t = va_arg (*args, af_packet_input_trace_t *);
  70   u32 indent = format_get_indent (s);
  71
  72   s = format (s, "af_packet: hw_if_index %d rx-queue %u next-index %d",
  73               t->hw_if_index, t->queue_id, t->next_index);
  74
  75   s = format (
  76     s, "\n%Ublock %u:\n%Uaddress %p version %u seq_num %lu pkt_num %u",
  77     format_white_space, indent + 2, t->block, format_white_space, indent + 4,
  78     t->block_start, t->bd.version, t->bd.hdr.bh1.seq_num, t->pkt_num);
  79   s =
  80     format (s,
  81             "\n%Utpacket3_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u"
  82             "\n%Usec 0x%x nsec 0x%x vlan %U"
  83 #ifdef TP_STATUS_VLAN_TPID_VALID
  84             " vlan_tpid %u"
  85 #endif
  86             ,
  87             format_white_space, indent + 2, format_white_space, indent + 4,
  88             t->tph.tp_status, t->tph.tp_len, t->tph.tp_snaplen, t->tph.tp_mac,
  89             t->tph.tp_net, format_white_space, indent + 4, t->tph.tp_sec,
  90             t->tph.tp_nsec, format_ethernet_vlan_tci, t->tph.hv1.tp_vlan_tci
  91 #ifdef TP_STATUS_VLAN_TPID_VALID
  92             ,
  93             t->tph.hv1.tp_vlan_tpid
  94 #endif
  95     );
  96
  97   s = format (s,
  98               "\n%Uvnet-hdr:\n%Uflags 0x%02x gso_type 0x%02x hdr_len %u"
  99               "\n%Ugso_size %u csum_start %u csum_offset %u",
 100               format_white_space, indent + 2, format_white_space, indent + 4,
 101               t->vnet_hdr.flags, t->vnet_hdr.gso_type, t->vnet_hdr.hdr_len,
 102               format_white_space, indent + 4, t->vnet_hdr.gso_size,
 103               t->vnet_hdr.csum_start, t->vnet_hdr.csum_offset);
 104   return s;
 105 }
 106
 107 always_inline void
 108 buffer_add_to_chain (vlib_buffer_t *b, vlib_buffer_t *first_b,
 109                      vlib_buffer_t *prev_b, u32 bi)
 110 {
 111   /* update first buffer */
 112   first_b->total_length_not_including_first_buffer += b->current_length;
 113
 114   /* update previous buffer */
 115   prev_b->next_buffer = bi;
 116   prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 117
 118   /* update current buffer */
 119   b->next_buffer = ~0;
 120 }
 121
 122 static_always_inline void
 123 fill_gso_offload (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz)
 124 {
 125   b->flags |= VNET_BUFFER_F_GSO;
 126   vnet_buffer2 (b)->gso_size = gso_size;
 127   vnet_buffer2 (b)->gso_l4_hdr_sz = l4_hdr_sz;
 128 }
 129
 130 static_always_inline void
 131 fill_cksum_offload (vlib_buffer_t *b, u8 *l4_hdr_sz, u8 is_ip)
 132 {
 133   vnet_buffer_oflags_t oflags = 0;
 134   u16 l2hdr_sz = 0;
 135   u16 ethertype = 0;
 136   u8 l4_proto = 0;
 137
 138   if (is_ip)
 139     {
 140       switch (b->data[0] & 0xf0)
 141         {
 142         case 0x40:
 143           ethertype = ETHERNET_TYPE_IP4;
 144           break;
 145         case 0x60:
 146           ethertype = ETHERNET_TYPE_IP6;
 147           break;
 148         }
 149     }
 150   else
 151     {
 152       ethernet_header_t *eth = vlib_buffer_get_current (b);
 153       ethertype = clib_net_to_host_u16 (eth->type);
 154       l2hdr_sz = sizeof (ethernet_header_t);
 155       if (ethernet_frame_is_tagged (ethertype))
 156         {
 157           ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eth + 1);
 158
 159           ethertype = clib_net_to_host_u16 (vlan->type);
 160           l2hdr_sz += sizeof (*vlan);
 161           if (ethertype == ETHERNET_TYPE_VLAN)
 162             {
 163               vlan++;
 164               ethertype = clib_net_to_host_u16 (vlan->type);
 165               l2hdr_sz += sizeof (*vlan);
 166             }
 167         }
 168     }
 169
 170   vnet_buffer (b)->l2_hdr_offset = 0;
 171   vnet_buffer (b)->l3_hdr_offset = l2hdr_sz;
 172
 173   if (ethertype == ETHERNET_TYPE_IP4)
 174     {
 175       ip4_header_t *ip4 = (vlib_buffer_get_current (b) + l2hdr_sz);
 176       vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
 177       b->flags |= (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 178                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 179                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
 180
 181       l4_proto = ip4->protocol;
 182     }
 183   else if (ethertype == ETHERNET_TYPE_IP6)
 184     {
 185       ip6_header_t *ip6 = (vlib_buffer_get_current (b) + l2hdr_sz);
 186       b->flags |= (VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 187                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 188                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
 189       u16 ip6_hdr_len = sizeof (ip6_header_t);
 190
 191       if (ip6_ext_hdr (ip6->protocol))
 192         {
 193           ip6_ext_header_t *p = (void *) (ip6 + 1);
 194           ip6_hdr_len += ip6_ext_header_len (p);
 195           while (ip6_ext_hdr (p->next_hdr))
 196             {
 197               ip6_hdr_len += ip6_ext_header_len (p);
 198               p = ip6_ext_next_header (p);
 199             }
 200           l4_proto = p->next_hdr;
 201         }
 202       else
 203         l4_proto = ip6->protocol;
 204       vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip6_hdr_len;
 205     }
 206
 207   if (l4_proto == IP_PROTOCOL_TCP)
 208     {
 209       oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
 210       tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b) +
 211                                             vnet_buffer (b)->l4_hdr_offset);
 212       *l4_hdr_sz = tcp_header_bytes (tcp);
 213     }
 214   else if (l4_proto == IP_PROTOCOL_UDP)
 215     {
 216       oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
 217       *l4_hdr_sz = sizeof (udp_header_t);
 218     }
 219
 220   if (oflags)
 221     vnet_buffer_offload_flags_set (b, oflags);
 222 }
 223
 224 always_inline uword
 225 af_packet_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
 226                            vlib_frame_t *frame, af_packet_if_t *apif,
 227                            u16 queue_id, u8 is_cksum_gso_enabled)
 228 {
 229   af_packet_main_t *apm = &af_packet_main;
 230   af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, queue_id);
 231   tpacket3_hdr_t *tph;
 232   u32 next_index;
 233   u32 n_free_bufs;
 234   u32 n_rx_packets = 0;
 235   u32 n_rx_bytes = 0;
 236   u32 timedout_blk = 0;
 237   u32 total = 0;
 238   u32 *to_next = 0;
 239   u32 block = rx_queue->next_rx_block;
 240   u32 block_nr = rx_queue->rx_req->tp_block_nr;
 241   u8 *block_start = 0;
 242   uword n_trace = vlib_get_trace_count (vm, node);
 243   u32 thread_index = vm->thread_index;
 244   u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
 245   u32 min_bufs = rx_queue->rx_req->tp_frame_size / n_buffer_bytes;
 246   u32 num_pkts = 0;
 247   u32 rx_frame_offset = 0;
 248   block_desc_t *bd = 0;
 249   vlib_buffer_t bt;
 250   u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP);
 251
 252   if (is_ip)
 253     next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
 254   else
 255     {
 256       next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 257       if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
 258         next_index = apif->per_interface_next_index;
 259
 260       /* redirect if feature path enabled */
 261       vnet_feature_start_device_input_x1 (apif->sw_if_index, &next_index, &bt);
 262     }
 263
 264   if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block]))
 265          ->hdr.bh1.block_status &
 266        TP_STATUS_USER) != 0)
 267     {
 268       u32 n_required = 0;
 269       bd = (block_desc_t *) block_start;
 270
 271       total++;
 272
 273       if (TP_STATUS_BLK_TMO & bd->hdr.bh1.block_status)
 274         timedout_blk++;
 275
 276       if (PREDICT_FALSE (rx_queue->is_rx_pending))
 277         {
 278           num_pkts = rx_queue->num_rx_pkts;
 279           rx_frame_offset = rx_queue->rx_frame_offset;
 280           rx_queue->is_rx_pending = 0;
 281         }
 282       else
 283         {
 284           num_pkts = bd->hdr.bh1.num_pkts;
 285           rx_frame_offset = sizeof (block_desc_t);
 286         }
 287
 288       n_required = clib_max (num_pkts, VLIB_FRAME_SIZE);
 289       n_free_bufs = vec_len (apm->rx_buffers[thread_index]);
 290       if (PREDICT_FALSE (n_free_bufs < n_required))
 291         {
 292           vec_validate (apm->rx_buffers[thread_index],
 293                         n_required + n_free_bufs - 1);
 294           n_free_bufs += vlib_buffer_alloc (
 295             vm, &apm->rx_buffers[thread_index][n_free_bufs], n_required);
 296           vec_set_len (apm->rx_buffers[thread_index], n_free_bufs);
 297         }
 298
 299       while (num_pkts && (n_free_bufs >= min_bufs))
 300         {
 301           u32 next0 = next_index;
 302           u32 n_left_to_next;
 303
 304           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 305
 306           while (num_pkts && n_left_to_next && (n_free_bufs >= min_bufs))
 307             {
 308               tph = (tpacket3_hdr_t *) (block_start + rx_frame_offset);
 309
 310               if (num_pkts > 1)
 311                 CLIB_PREFETCH (block_start + rx_frame_offset +
 312                                  tph->tp_next_offset,
 313                                2 * CLIB_CACHE_LINE_BYTES, LOAD);
 314
 315               vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0;
 316               vnet_virtio_net_hdr_t *vnet_hdr = 0;
 317               u32 data_len = tph->tp_snaplen;
 318               u32 offset = 0;
 319               u32 bi0 = ~0, first_bi0 = ~0;
 320               u8 l4_hdr_sz = 0;
 321
 322               if (is_cksum_gso_enabled)
 323                 vnet_hdr =
 324                   (vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac -
 325                                              sizeof (vnet_virtio_net_hdr_t));
 326
 327               // save current state and return
 328               if (PREDICT_FALSE (((data_len / n_buffer_bytes) + 1) >
 329                                  vec_len (apm->rx_buffers[thread_index])))
 330                 {
 331                   rx_queue->rx_frame_offset = rx_frame_offset;
 332                   rx_queue->num_rx_pkts = num_pkts;
 333                   rx_queue->is_rx_pending = 1;
 334                   vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 335                   goto done;
 336                 }
 337
 338               while (data_len)
 339                 {
 340                   /* grab free buffer */
 341                   u32 last_empty_buffer =
 342                     vec_len (apm->rx_buffers[thread_index]) - 1;
 343                   bi0 = apm->rx_buffers[thread_index][last_empty_buffer];
 344                   vec_set_len (apm->rx_buffers[thread_index],
 345                                last_empty_buffer);
 346                   n_free_bufs--;
 347
 348                   /* copy data */
 349                   u32 bytes_to_copy =
 350                     data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
 351                   u32 vlan_len = 0;
 352                   u32 bytes_copied = 0;
 353
 354                   b0 = vlib_get_buffer (vm, bi0);
 355                   b0->current_data = 0;
 356
 357                   /* Kernel removes VLAN headers, so reconstruct VLAN */
 358                   if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID))
 359                     {
 360                       if (PREDICT_TRUE (offset == 0))
 361                         {
 362                           clib_memcpy_fast (vlib_buffer_get_current (b0),
 363                                             (u8 *) tph + tph->tp_mac,
 364                                             sizeof (ethernet_header_t));
 365                           ethernet_header_t *eth =
 366                             vlib_buffer_get_current (b0);
 367                           ethernet_vlan_header_t *vlan =
 368                             (ethernet_vlan_header_t *) (eth + 1);
 369                           vlan->priority_cfi_and_id =
 370                             clib_host_to_net_u16 (tph->hv1.tp_vlan_tci);
 371                           vlan->type = eth->type;
 372                           eth->type =
 373                             clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
 374                           vlan_len = sizeof (ethernet_vlan_header_t);
 375                           bytes_copied = sizeof (ethernet_header_t);
 376                         }
 377                     }
 378                   clib_memcpy_fast (((u8 *) vlib_buffer_get_current (b0)) +
 379                                       bytes_copied + vlan_len,
 380                                     (u8 *) tph + tph->tp_mac + offset +
 381                                       bytes_copied,
 382                                     (bytes_to_copy - bytes_copied));
 383
 384                   /* fill buffer header */
 385                   b0->current_length = bytes_to_copy + vlan_len;
 386
 387                   if (offset == 0)
 388                     {
 389                       b0->total_length_not_including_first_buffer = 0;
 390                       b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 391                       vnet_buffer (b0)->sw_if_index[VLIB_RX] =
 392                         apif->sw_if_index;
 393                       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0;
 394                       first_b0 = b0;
 395                       first_bi0 = bi0;
 396                       if (is_cksum_gso_enabled)
 397                         {
 398                           if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
 399                             fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip);
 400                           if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 |
 401                                                     VIRTIO_NET_HDR_GSO_TCPV6))
 402                             fill_gso_offload (first_b0, vnet_hdr->gso_size,
 403                                               l4_hdr_sz);
 404                         }
 405                     }
 406                   else
 407                     buffer_add_to_chain (b0, first_b0, prev_b0, bi0);
 408
 409                   prev_b0 = b0;
 410                   offset += bytes_to_copy;
 411                   data_len -= bytes_to_copy;
 412                 }
 413               n_rx_packets++;
 414               n_rx_bytes += tph->tp_snaplen;
 415               to_next[0] = first_bi0;
 416               to_next += 1;
 417               n_left_to_next--;
 418
 419               /* drop partial packets */
 420               if (PREDICT_FALSE (tph->tp_len != tph->tp_snaplen))
 421                 {
 422                   next0 = VNET_DEVICE_INPUT_NEXT_DROP;
 423                   first_b0->error =
 424                     node->errors[AF_PACKET_INPUT_ERROR_PARTIAL_PKT];
 425                 }
 426               else
 427                 {
 428                   if (PREDICT_FALSE (apif->mode == AF_PACKET_IF_MODE_IP))
 429                     {
 430                       switch (first_b0->data[0] & 0xf0)
 431                         {
 432                         case 0x40:
 433                           next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
 434                           break;
 435                         case 0x60:
 436                           next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
 437                           break;
 438                         default:
 439                           next0 = VNET_DEVICE_INPUT_NEXT_DROP;
 440                           break;
 441                         }
 442                       if (PREDICT_FALSE (apif->per_interface_next_index != ~0))
 443                         next0 = apif->per_interface_next_index;
 444                     }
 445                   else
 446                     {
 447                       /* copy feature arc data from template */
 448                       first_b0->current_config_index = bt.current_config_index;
 449                       vnet_buffer (first_b0)->feature_arc_index =
 450                         vnet_buffer (&bt)->feature_arc_index;
 451                     }
 452                 }
 453
 454               /* trace */
 455               if (PREDICT_FALSE (n_trace > 0 &&
 456                                  vlib_trace_buffer (vm, node, next0, first_b0,
 457                                                     /* follow_chain */ 0)))
 458                 {
 459                   af_packet_input_trace_t *tr;
 460                   vlib_set_trace_count (vm, node, --n_trace);
 461                   tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
 462                   tr->next_index = next0;
 463                   tr->hw_if_index = apif->hw_if_index;
 464                   tr->queue_id = queue_id;
 465                   tr->block = block;
 466                   tr->block_start = bd;
 467                   tr->pkt_num = bd->hdr.bh1.num_pkts - num_pkts;
 468                   clib_memcpy_fast (&tr->bd, bd, sizeof (block_desc_t));
 469                   clib_memcpy_fast (&tr->tph, tph, sizeof (tpacket3_hdr_t));
 470                   if (is_cksum_gso_enabled)
 471                     clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr,
 472                                       sizeof (vnet_virtio_net_hdr_t));
 473                   else
 474                     clib_memset_u8 (&tr->vnet_hdr, 0,
 475                                     sizeof (vnet_virtio_net_hdr_t));
 476                 }
 477
 478               /* enque and take next packet */
 479               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 480                                                n_left_to_next, first_bi0,
 481                                                next0);
 482
 483               /* next packet */
 484               num_pkts--;
 485               rx_frame_offset += tph->tp_next_offset;
 486             }
 487
 488           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 489         }
 490
 491       if (PREDICT_TRUE (num_pkts == 0))
 492         {
 493           bd->hdr.bh1.block_status = TP_STATUS_KERNEL;
 494           block = (block + 1) % block_nr;
 495         }
 496       else
 497         {
 498           rx_queue->rx_frame_offset = rx_frame_offset;
 499           rx_queue->num_rx_pkts = num_pkts;
 500           rx_queue->is_rx_pending = 1;
 501         }
 502     }
 503
 504   rx_queue->next_rx_block = block;
 505
 506 done:
 507
 508   if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block]))
 509          ->hdr.bh1.block_status &
 510        TP_STATUS_USER) != 0)
 511     vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_POLLING);
 512   else
 513     vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_INTERRUPT);
 514
 515   vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TOTAL_RECV_BLK,
 516                     total);
 517   vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TIMEDOUT_BLK,
 518                     timedout_blk);
 519
 520   vlib_increment_combined_counter
 521     (vnet_get_main ()->interface_main.combined_sw_if_counters
 522      + VNET_INTERFACE_COUNTER_RX,
 523      vlib_get_thread_index (), apif->hw_if_index, n_rx_packets, n_rx_bytes);
 524
 525   vnet_device_increment_rx_packets (thread_index, n_rx_packets);
 526   return n_rx_packets;
 527 }
 528
 529 VLIB_NODE_FN (af_packet_input_node) (vlib_main_t * vm,
 530                                      vlib_node_runtime_t * node,
 531                                      vlib_frame_t * frame)
 532 {
 533   u32 n_rx_packets = 0;
 534   af_packet_main_t *apm = &af_packet_main;
 535   vnet_hw_if_rxq_poll_vector_t *pv;
 536   pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
 537   for (int i = 0; i < vec_len (pv); i++)
 538     {
 539       af_packet_if_t *apif;
 540       apif = vec_elt_at_index (apm->interfaces, pv[i].dev_instance);
 541       if (apif->is_admin_up)
 542         {
 543           if (apif->is_cksum_gso_enabled)
 544             n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif,
 545                                                        pv[i].queue_id, 1);
 546           else
 547             n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif,
 548                                                        pv[i].queue_id, 0);
 549         }
 550     }
 551   return n_rx_packets;
 552 }
 553
 554 VLIB_REGISTER_NODE (af_packet_input_node) = {
 555   .name = "af-packet-input",
 556   .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
 557   .sibling_of = "device-input",
 558   .format_trace = format_af_packet_input_trace,
 559   .type = VLIB_NODE_TYPE_INPUT,
 560   .state = VLIB_NODE_STATE_INTERRUPT,
 561   .n_errors = AF_PACKET_INPUT_N_ERROR,
 562   .error_strings = af_packet_input_error_strings,
 563 };
 564
 565
 566 /*
 567  * fd.io coding-style-patch-verification: ON
 568  *
 569  * Local Variables:
 570  * eval: (c-set-style "gnu")
 571  * End:
 572  */