src/vnet/bonding/node.c

   1 /*
   2  *------------------------------------------------------------------
   3  * Copyright (c) 2017 Cisco and/or its affiliates.
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *------------------------------------------------------------------
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdint.h>
  20 #include <vnet/llc/llc.h>
  21 #include <vnet/snap/snap.h>
  22 #include <vnet/bonding/node.h>
  23
  24 #ifndef CLIB_MARCH_VARIANT
  25 bond_main_t bond_main;
  26 #endif /* CLIB_MARCH_VARIANT */
  27
  28 #define foreach_bond_input_error \
  29   _(NONE, "no error")            \
  30   _(IF_DOWN, "interface down")   \
  31   _(PASSIVE_IF, "traffic received on passive interface")   \
  32   _(PASS_THRU, "pass through (CDP, LLDP, slow protocols)")
  33
  34 typedef enum
  35 {
  36 #define _(f,s) BOND_INPUT_ERROR_##f,
  37   foreach_bond_input_error
  38 #undef _
  39     BOND_INPUT_N_ERROR,
  40 } bond_input_error_t;
  41
  42 static char *bond_input_error_strings[] = {
  43 #define _(n,s) s,
  44   foreach_bond_input_error
  45 #undef _
  46 };
  47
  48 static u8 *
  49 format_bond_input_trace (u8 * s, va_list * args)
  50 {
  51   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  52   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  53   bond_packet_trace_t *t = va_arg (*args, bond_packet_trace_t *);
  54
  55   s = format (s, "src %U, dst %U, %U -> %U",
  56               format_ethernet_address, t->ethernet.src_address,
  57               format_ethernet_address, t->ethernet.dst_address,
  58               format_vnet_sw_if_index_name, vnet_get_main (),
  59               t->sw_if_index,
  60               format_vnet_sw_if_index_name, vnet_get_main (),
  61               t->bond_sw_if_index);
  62
  63   return s;
  64 }
  65
  66 typedef enum
  67 {
  68   BOND_INPUT_NEXT_DROP,
  69   BOND_INPUT_N_NEXT,
  70 } bond_output_next_t;
  71
  72 static_always_inline u8
  73 packet_is_cdp (ethernet_header_t * eth)
  74 {
  75   llc_header_t *llc;
  76   snap_header_t *snap;
  77
  78   llc = (llc_header_t *) (eth + 1);
  79   snap = (snap_header_t *) (llc + 1);
  80
  81   return ((eth->type == htons (ETHERNET_TYPE_CDP)) ||
  82           ((llc->src_sap == 0xAA) && (llc->control == 0x03) &&
  83            (snap->protocol == htons (0x2000)) &&
  84            (snap->oui[0] == 0) && (snap->oui[1] == 0) &&
  85            (snap->oui[2] == 0x0C)));
  86 }
  87
  88 static inline void
  89 bond_sw_if_idx_rewrite (vlib_main_t * vm, vlib_node_runtime_t * node,
  90                         vlib_buffer_t * b, u32 bond_sw_if_index,
  91                         u32 * n_rx_packets, u32 * n_rx_bytes)
  92 {
  93   u16 *ethertype_p, ethertype;
  94   ethernet_vlan_header_t *vlan;
  95   ethernet_header_t *eth = (ethernet_header_t *) vlib_buffer_get_current (b);
  96
  97   (*n_rx_packets)++;
  98   *n_rx_bytes += b->current_length;
  99   ethertype = clib_mem_unaligned (&eth->type, u16);
 100   if (!ethernet_frame_is_tagged (ntohs (ethertype)))
 101     {
 102       // Let some layer2 packets pass through.
 103       if (PREDICT_TRUE ((ethertype != htons (ETHERNET_TYPE_SLOW_PROTOCOLS))
 104                         && !packet_is_cdp (eth)
 105                         && (ethertype != htons (ETHERNET_TYPE_802_1_LLDP))))
 106         {
 107           /* Change the physical interface to bond interface */
 108           vnet_buffer (b)->sw_if_index[VLIB_RX] = bond_sw_if_index;
 109           return;
 110         }
 111     }
 112   else
 113     {
 114       vlan = (void *) (eth + 1);
 115       ethertype_p = &vlan->type;
 116       ethertype = clib_mem_unaligned (ethertype_p, u16);
 117       if (ethertype == ntohs (ETHERNET_TYPE_VLAN))
 118         {
 119           vlan++;
 120           ethertype_p = &vlan->type;
 121         }
 122       ethertype = clib_mem_unaligned (ethertype_p, u16);
 123       if (PREDICT_TRUE ((ethertype != htons (ETHERNET_TYPE_SLOW_PROTOCOLS))
 124                         && (ethertype != htons (ETHERNET_TYPE_CDP))
 125                         && (ethertype != htons (ETHERNET_TYPE_802_1_LLDP))))
 126         {
 127           /* Change the physical interface to bond interface */
 128           vnet_buffer (b)->sw_if_index[VLIB_RX] = bond_sw_if_index;
 129           return;
 130         }
 131     }
 132
 133   vlib_error_count (vm, node->node_index, BOND_INPUT_ERROR_PASS_THRU, 1);
 134   return;
 135 }
 136
 137 static inline void
 138 bond_update_next (vlib_main_t * vm, vlib_node_runtime_t * node,
 139                   u32 * last_slave_sw_if_index, u32 slave_sw_if_index,
 140                   u32 * bond_sw_if_index, vlib_buffer_t * b,
 141                   u32 * next_index, vlib_error_t * error)
 142 {
 143   slave_if_t *sif;
 144   bond_if_t *bif;
 145
 146   *next_index = BOND_INPUT_NEXT_DROP;
 147   *error = 0;
 148
 149   if (PREDICT_TRUE (*last_slave_sw_if_index == slave_sw_if_index))
 150     goto next;
 151
 152   *last_slave_sw_if_index = slave_sw_if_index;
 153
 154   sif = bond_get_slave_by_sw_if_index (slave_sw_if_index);
 155   ASSERT (sif);
 156
 157   bif = bond_get_master_by_dev_instance (sif->bif_dev_instance);
 158
 159   ASSERT (bif);
 160   ASSERT (vec_len (bif->slaves));
 161
 162   if (PREDICT_FALSE (bif->admin_up == 0))
 163     {
 164       *bond_sw_if_index = slave_sw_if_index;
 165       *error = node->errors[BOND_INPUT_ERROR_IF_DOWN];
 166       return;
 167     }
 168
 169   if (PREDICT_FALSE ((bif->mode == BOND_MODE_ACTIVE_BACKUP) &&
 170                      vec_len (bif->active_slaves) &&
 171                      (slave_sw_if_index != bif->active_slaves[0])))
 172     {
 173       *bond_sw_if_index = slave_sw_if_index;
 174       *error = node->errors[BOND_INPUT_ERROR_PASSIVE_IF];
 175       return;
 176     }
 177
 178   *bond_sw_if_index = bif->sw_if_index;
 179
 180 next:
 181   vnet_feature_next (next_index, b);
 182 }
 183
 184 static_always_inline void
 185 bond_update_next_x4 (vlib_buffer_t * b0, vlib_buffer_t * b1,
 186                      vlib_buffer_t * b2, vlib_buffer_t * b3)
 187 {
 188   u32 tmp0, tmp1, tmp2, tmp3;
 189
 190   tmp0 = tmp1 = tmp2 = tmp3 = BOND_INPUT_NEXT_DROP;
 191   vnet_feature_next (&tmp0, b0);
 192   vnet_feature_next (&tmp1, b1);
 193   vnet_feature_next (&tmp2, b2);
 194   vnet_feature_next (&tmp3, b3);
 195 }
 196
 197 VLIB_NODE_FN (bond_input_node) (vlib_main_t * vm,
 198                                 vlib_node_runtime_t * node,
 199                                 vlib_frame_t * frame)
 200 {
 201   u16 thread_index = vm->thread_index;
 202   u32 *from, n_left;
 203   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
 204   u32 sw_if_indices[VLIB_FRAME_SIZE], *sw_if_index;
 205   u16 nexts[VLIB_FRAME_SIZE], *next;
 206   u32 last_slave_sw_if_index = ~0;
 207   u32 bond_sw_if_index = 0;
 208   vlib_error_t error = 0;
 209   u32 next_index = 0;
 210   u32 n_rx_bytes = 0, n_rx_packets = 0;
 211
 212   /* Vector of buffer / pkt indices we're supposed to process */
 213   from = vlib_frame_vector_args (frame);
 214
 215   /* Number of buffers / pkts */
 216   n_left = frame->n_vectors;
 217
 218   vlib_get_buffers (vm, from, bufs, n_left);
 219
 220   b = bufs;
 221   next = nexts;
 222   sw_if_index = sw_if_indices;
 223
 224   while (n_left >= 4)
 225     {
 226       u32 x = 0;
 227       /* Prefetch next iteration */
 228       if (PREDICT_TRUE (n_left >= 16))
 229         {
 230           vlib_prefetch_buffer_data (b[8], LOAD);
 231           vlib_prefetch_buffer_data (b[9], LOAD);
 232           vlib_prefetch_buffer_data (b[10], LOAD);
 233           vlib_prefetch_buffer_data (b[11], LOAD);
 234
 235           vlib_prefetch_buffer_header (b[12], LOAD);
 236           vlib_prefetch_buffer_header (b[13], LOAD);
 237           vlib_prefetch_buffer_header (b[14], LOAD);
 238           vlib_prefetch_buffer_header (b[15], LOAD);
 239         }
 240
 241       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 242       sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
 243       sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
 244       sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
 245
 246       x |= sw_if_index[0] ^ last_slave_sw_if_index;
 247       x |= sw_if_index[1] ^ last_slave_sw_if_index;
 248       x |= sw_if_index[2] ^ last_slave_sw_if_index;
 249       x |= sw_if_index[3] ^ last_slave_sw_if_index;
 250
 251       if (PREDICT_TRUE (x == 0))
 252         {
 253           /*
 254            * Optimize to call update_next only if there is a feature arc
 255            * after bond-input. Test feature count greater than 1 because
 256            * bond-input itself is a feature arc for this slave interface.
 257            */
 258           ASSERT ((vnet_buffer (b[0])->feature_arc_index ==
 259                    vnet_buffer (b[1])->feature_arc_index) &&
 260                   (vnet_buffer (b[0])->feature_arc_index ==
 261                    vnet_buffer (b[2])->feature_arc_index) &&
 262                   (vnet_buffer (b[0])->feature_arc_index ==
 263                    vnet_buffer (b[3])->feature_arc_index));
 264           if (PREDICT_FALSE (vnet_get_feature_count
 265                              (vnet_buffer (b[0])->feature_arc_index,
 266                               last_slave_sw_if_index) > 1))
 267             bond_update_next_x4 (b[0], b[1], b[2], b[3]);
 268
 269           next[0] = next[1] = next[2] = next[3] = next_index;
 270           if (next_index == BOND_INPUT_NEXT_DROP)
 271             {
 272               b[0]->error = error;
 273               b[1]->error = error;
 274               b[2]->error = error;
 275               b[3]->error = error;
 276             }
 277           else
 278             {
 279               bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 280                                       &n_rx_packets, &n_rx_bytes);
 281               bond_sw_if_idx_rewrite (vm, node, b[1], bond_sw_if_index,
 282                                       &n_rx_packets, &n_rx_bytes);
 283               bond_sw_if_idx_rewrite (vm, node, b[2], bond_sw_if_index,
 284                                       &n_rx_packets, &n_rx_bytes);
 285               bond_sw_if_idx_rewrite (vm, node, b[3], bond_sw_if_index,
 286                                       &n_rx_packets, &n_rx_bytes);
 287             }
 288         }
 289       else
 290         {
 291           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[0],
 292                             &bond_sw_if_index, b[0], &next_index, &error);
 293           next[0] = next_index;
 294           if (next_index == BOND_INPUT_NEXT_DROP)
 295             b[0]->error = error;
 296           else
 297             bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 298                                     &n_rx_packets, &n_rx_bytes);
 299
 300           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[1],
 301                             &bond_sw_if_index, b[1], &next_index, &error);
 302           next[1] = next_index;
 303           if (next_index == BOND_INPUT_NEXT_DROP)
 304             b[1]->error = error;
 305           else
 306             bond_sw_if_idx_rewrite (vm, node, b[1], bond_sw_if_index,
 307                                     &n_rx_packets, &n_rx_bytes);
 308
 309           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[2],
 310                             &bond_sw_if_index, b[2], &next_index, &error);
 311           next[2] = next_index;
 312           if (next_index == BOND_INPUT_NEXT_DROP)
 313             b[2]->error = error;
 314           else
 315             bond_sw_if_idx_rewrite (vm, node, b[2], bond_sw_if_index,
 316                                     &n_rx_packets, &n_rx_bytes);
 317
 318           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[3],
 319                             &bond_sw_if_index, b[3], &next_index, &error);
 320           next[3] = next_index;
 321           if (next_index == BOND_INPUT_NEXT_DROP)
 322             b[3]->error = error;
 323           else
 324             bond_sw_if_idx_rewrite (vm, node, b[3], bond_sw_if_index,
 325                                     &n_rx_packets, &n_rx_bytes);
 326         }
 327
 328       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
 329       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
 330       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
 331       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
 332
 333       /* next */
 334       n_left -= 4;
 335       b += 4;
 336       sw_if_index += 4;
 337       next += 4;
 338     }
 339
 340   while (n_left)
 341     {
 342       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 343       bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[0],
 344                         &bond_sw_if_index, b[0], &next_index, &error);
 345       next[0] = next_index;
 346       if (next_index == BOND_INPUT_NEXT_DROP)
 347         b[0]->error = error;
 348       else
 349         bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 350                                 &n_rx_packets, &n_rx_bytes);
 351
 352       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
 353
 354       /* next */
 355       n_left -= 1;
 356       b += 1;
 357       sw_if_index += 1;
 358       next += 1;
 359     }
 360
 361   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
 362     {
 363       n_left = frame->n_vectors;        /* number of packets to process */
 364       b = bufs;
 365       sw_if_index = sw_if_indices;
 366       bond_packet_trace_t *t0;
 367
 368       while (n_left)
 369         {
 370           if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 371             {
 372               t0 = vlib_add_trace (vm, node, b[0], sizeof (*t0));
 373               t0->sw_if_index = sw_if_index[0];
 374               clib_memcpy_fast (&t0->ethernet, vlib_buffer_get_current (b[0]),
 375                                 sizeof (ethernet_header_t));
 376               t0->bond_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 377             }
 378           /* next */
 379           n_left--;
 380           b++;
 381           sw_if_index++;
 382         }
 383     }
 384
 385   /* increase rx counters */
 386   vlib_increment_combined_counter
 387     (vnet_main.interface_main.combined_sw_if_counters +
 388      VNET_INTERFACE_COUNTER_RX, thread_index, bond_sw_if_index, n_rx_packets,
 389      n_rx_bytes);
 390
 391   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 392   vlib_node_increment_counter (vm, bond_input_node.index,
 393                                BOND_INPUT_ERROR_NONE, frame->n_vectors);
 394
 395   return frame->n_vectors;
 396 }
 397
 398 static clib_error_t *
 399 bond_input_init (vlib_main_t * vm)
 400 {
 401   return 0;
 402 }
 403
 404 /* *INDENT-OFF* */
 405 VLIB_REGISTER_NODE (bond_input_node) = {
 406   .name = "bond-input",
 407   .vector_size = sizeof (u32),
 408   .format_buffer = format_ethernet_header_with_length,
 409   .format_trace = format_bond_input_trace,
 410   .type = VLIB_NODE_TYPE_INTERNAL,
 411   .n_errors = BOND_INPUT_N_ERROR,
 412   .error_strings = bond_input_error_strings,
 413   .n_next_nodes = BOND_INPUT_N_NEXT,
 414   .next_nodes =
 415   {
 416     [BOND_INPUT_NEXT_DROP] = "error-drop"
 417   }
 418 };
 419
 420 VLIB_INIT_FUNCTION (bond_input_init);
 421
 422 VNET_FEATURE_INIT (bond_input, static) =
 423 {
 424   .arc_name = "device-input",
 425   .node_name = "bond-input",
 426   .runs_before = VNET_FEATURES ("ethernet-input"),
 427 };
 428 /* *INDENT-ON* */
 429
 430 static clib_error_t *
 431 bond_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 432 {
 433   bond_main_t *bm = &bond_main;
 434   slave_if_t *sif;
 435   vlib_main_t *vm = bm->vlib_main;
 436
 437   sif = bond_get_slave_by_sw_if_index (sw_if_index);
 438   if (sif)
 439     {
 440       if (sif->lacp_enabled)
 441         return 0;
 442
 443       /* port_enabled is both admin up and hw link up */
 444       sif->port_enabled = ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) &&
 445                            vnet_sw_interface_is_link_up (vnm, sw_if_index));
 446       if (sif->port_enabled == 0)
 447         bond_disable_collecting_distributing (vm, sif);
 448       else
 449         bond_enable_collecting_distributing (vm, sif);
 450     }
 451
 452   return 0;
 453 }
 454
 455 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bond_sw_interface_up_down);
 456
 457 static clib_error_t *
 458 bond_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 459 {
 460   bond_main_t *bm = &bond_main;
 461   slave_if_t *sif;
 462   vnet_sw_interface_t *sw;
 463   vlib_main_t *vm = bm->vlib_main;
 464
 465   sw = vnet_get_hw_sw_interface (vnm, hw_if_index);
 466   sif = bond_get_slave_by_sw_if_index (sw->sw_if_index);
 467   if (sif)
 468     {
 469       if (sif->lacp_enabled)
 470         return 0;
 471
 472       /* port_enabled is both admin up and hw link up */
 473       sif->port_enabled = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) &&
 474                            vnet_sw_interface_is_admin_up (vnm,
 475                                                           sw->sw_if_index));
 476       if (sif->port_enabled == 0)
 477         bond_disable_collecting_distributing (vm, sif);
 478       else
 479         bond_enable_collecting_distributing (vm, sif);
 480     }
 481
 482   return 0;
 483 }
 484
 485 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bond_hw_interface_up_down);
 486
 487 /*
 488  * fd.io coding-style-patch-verification: ON
 489  *
 490  * Local Variables:
 491  * eval: (c-set-style "gnu")
 492  * End:
 493  */