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   ALWAYS_ASSERT (sif);
 156
 157   bif = bond_get_master_by_dev_instance (sif->bif_dev_instance);
 158
 159   ALWAYS_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     }
 167
 168   if (PREDICT_FALSE ((bif->mode == BOND_MODE_ACTIVE_BACKUP) &&
 169                      vec_len (bif->active_slaves) &&
 170                      (slave_sw_if_index != bif->active_slaves[0])))
 171     {
 172       *bond_sw_if_index = slave_sw_if_index;
 173       *error = node->errors[BOND_INPUT_ERROR_PASSIVE_IF];
 174       return;
 175     }
 176
 177   *bond_sw_if_index = bif->sw_if_index;
 178
 179 next:
 180   vnet_feature_next (next_index, b);
 181 }
 182
 183 static_always_inline void
 184 bond_update_next_x4 (vlib_buffer_t * b0, vlib_buffer_t * b1,
 185                      vlib_buffer_t * b2, vlib_buffer_t * b3)
 186 {
 187   u32 tmp0, tmp1, tmp2, tmp3;
 188
 189   tmp0 = tmp1 = tmp2 = tmp3 = BOND_INPUT_NEXT_DROP;
 190   vnet_feature_next (&tmp0, b0);
 191   vnet_feature_next (&tmp1, b1);
 192   vnet_feature_next (&tmp2, b2);
 193   vnet_feature_next (&tmp3, b3);
 194 }
 195
 196 VLIB_NODE_FN (bond_input_node) (vlib_main_t * vm,
 197                                 vlib_node_runtime_t * node,
 198                                 vlib_frame_t * frame)
 199 {
 200   u16 thread_index = vm->thread_index;
 201   u32 *from, n_left;
 202   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
 203   u32 sw_if_indices[VLIB_FRAME_SIZE], *sw_if_index;
 204   u16 nexts[VLIB_FRAME_SIZE], *next;
 205   u32 last_slave_sw_if_index = ~0;
 206   u32 bond_sw_if_index = 0;
 207   vlib_error_t error = 0;
 208   u32 next_index = 0;
 209   u32 n_rx_bytes = 0, n_rx_packets = 0;
 210
 211   /* Vector of buffer / pkt indices we're supposed to process */
 212   from = vlib_frame_vector_args (frame);
 213
 214   /* Number of buffers / pkts */
 215   n_left = frame->n_vectors;
 216
 217   vlib_get_buffers (vm, from, bufs, n_left);
 218
 219   b = bufs;
 220   next = nexts;
 221   sw_if_index = sw_if_indices;
 222
 223   while (n_left >= 4)
 224     {
 225       u32 x = 0;
 226       /* Prefetch next iteration */
 227       if (PREDICT_TRUE (n_left >= 16))
 228         {
 229           vlib_prefetch_buffer_data (b[8], LOAD);
 230           vlib_prefetch_buffer_data (b[9], LOAD);
 231           vlib_prefetch_buffer_data (b[10], LOAD);
 232           vlib_prefetch_buffer_data (b[11], LOAD);
 233
 234           vlib_prefetch_buffer_header (b[12], LOAD);
 235           vlib_prefetch_buffer_header (b[13], LOAD);
 236           vlib_prefetch_buffer_header (b[14], LOAD);
 237           vlib_prefetch_buffer_header (b[15], LOAD);
 238         }
 239
 240       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 241       sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
 242       sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
 243       sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
 244
 245       x |= sw_if_index[0] ^ last_slave_sw_if_index;
 246       x |= sw_if_index[1] ^ last_slave_sw_if_index;
 247       x |= sw_if_index[2] ^ last_slave_sw_if_index;
 248       x |= sw_if_index[3] ^ last_slave_sw_if_index;
 249
 250       if (PREDICT_TRUE (x == 0))
 251         {
 252           /*
 253            * Optimize to call update_next only if there is a feature arc
 254            * after bond-input. Test feature count greater than 1 because
 255            * bond-input itself is a feature arc for this slave interface.
 256            */
 257           ASSERT ((vnet_buffer (b[0])->feature_arc_index ==
 258                    vnet_buffer (b[1])->feature_arc_index) &&
 259                   (vnet_buffer (b[0])->feature_arc_index ==
 260                    vnet_buffer (b[2])->feature_arc_index) &&
 261                   (vnet_buffer (b[0])->feature_arc_index ==
 262                    vnet_buffer (b[3])->feature_arc_index));
 263           if (PREDICT_FALSE (vnet_get_feature_count
 264                              (vnet_buffer (b[0])->feature_arc_index,
 265                               last_slave_sw_if_index) > 1))
 266             bond_update_next_x4 (b[0], b[1], b[2], b[3]);
 267
 268           next[0] = next[1] = next[2] = next[3] = next_index;
 269           if (next_index == BOND_INPUT_NEXT_DROP)
 270             {
 271               b[0]->error = error;
 272               b[1]->error = error;
 273               b[2]->error = error;
 274               b[3]->error = error;
 275             }
 276           else
 277             {
 278               bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 279                                       &n_rx_packets, &n_rx_bytes);
 280               bond_sw_if_idx_rewrite (vm, node, b[1], bond_sw_if_index,
 281                                       &n_rx_packets, &n_rx_bytes);
 282               bond_sw_if_idx_rewrite (vm, node, b[2], bond_sw_if_index,
 283                                       &n_rx_packets, &n_rx_bytes);
 284               bond_sw_if_idx_rewrite (vm, node, b[3], bond_sw_if_index,
 285                                       &n_rx_packets, &n_rx_bytes);
 286             }
 287         }
 288       else
 289         {
 290           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[0],
 291                             &bond_sw_if_index, b[0], &next_index, &error);
 292           next[0] = next_index;
 293           if (next_index == BOND_INPUT_NEXT_DROP)
 294             b[0]->error = error;
 295           else
 296             bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 297                                     &n_rx_packets, &n_rx_bytes);
 298
 299           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[1],
 300                             &bond_sw_if_index, b[1], &next_index, &error);
 301           next[1] = next_index;
 302           if (next_index == BOND_INPUT_NEXT_DROP)
 303             b[1]->error = error;
 304           else
 305             bond_sw_if_idx_rewrite (vm, node, b[1], bond_sw_if_index,
 306                                     &n_rx_packets, &n_rx_bytes);
 307
 308           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[2],
 309                             &bond_sw_if_index, b[2], &next_index, &error);
 310           next[2] = next_index;
 311           if (next_index == BOND_INPUT_NEXT_DROP)
 312             b[2]->error = error;
 313           else
 314             bond_sw_if_idx_rewrite (vm, node, b[2], bond_sw_if_index,
 315                                     &n_rx_packets, &n_rx_bytes);
 316
 317           bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[3],
 318                             &bond_sw_if_index, b[3], &next_index, &error);
 319           next[3] = next_index;
 320           if (next_index == BOND_INPUT_NEXT_DROP)
 321             b[3]->error = error;
 322           else
 323             bond_sw_if_idx_rewrite (vm, node, b[3], bond_sw_if_index,
 324                                     &n_rx_packets, &n_rx_bytes);
 325         }
 326
 327       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
 328       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
 329       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
 330       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
 331
 332       /* next */
 333       n_left -= 4;
 334       b += 4;
 335       sw_if_index += 4;
 336       next += 4;
 337     }
 338
 339   while (n_left)
 340     {
 341       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 342       bond_update_next (vm, node, &last_slave_sw_if_index, sw_if_index[0],
 343                         &bond_sw_if_index, b[0], &next_index, &error);
 344       next[0] = next_index;
 345       if (next_index == BOND_INPUT_NEXT_DROP)
 346         b[0]->error = error;
 347       else
 348         bond_sw_if_idx_rewrite (vm, node, b[0], bond_sw_if_index,
 349                                 &n_rx_packets, &n_rx_bytes);
 350
 351       VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
 352
 353       /* next */
 354       n_left -= 1;
 355       b += 1;
 356       sw_if_index += 1;
 357       next += 1;
 358     }
 359
 360   if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
 361     {
 362       n_left = frame->n_vectors;        /* number of packets to process */
 363       b = bufs;
 364       sw_if_index = sw_if_indices;
 365       bond_packet_trace_t *t0;
 366
 367       while (n_left)
 368         {
 369           if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 370             {
 371               t0 = vlib_add_trace (vm, node, b[0], sizeof (*t0));
 372               t0->sw_if_index = sw_if_index[0];
 373               clib_memcpy_fast (&t0->ethernet, vlib_buffer_get_current (b[0]),
 374                                 sizeof (ethernet_header_t));
 375               t0->bond_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
 376             }
 377           /* next */
 378           n_left--;
 379           b++;
 380           sw_if_index++;
 381         }
 382     }
 383
 384   /* increase rx counters */
 385   vlib_increment_combined_counter
 386     (vnet_main.interface_main.combined_sw_if_counters +
 387      VNET_INTERFACE_COUNTER_RX, thread_index, bond_sw_if_index, n_rx_packets,
 388      n_rx_bytes);
 389
 390   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 391   vlib_node_increment_counter (vm, bond_input_node.index,
 392                                BOND_INPUT_ERROR_NONE, frame->n_vectors);
 393
 394   return frame->n_vectors;
 395 }
 396
 397 static clib_error_t *
 398 bond_input_init (vlib_main_t * vm)
 399 {
 400   return 0;
 401 }
 402
 403 /* *INDENT-OFF* */
 404 VLIB_REGISTER_NODE (bond_input_node) = {
 405   .name = "bond-input",
 406   .vector_size = sizeof (u32),
 407   .format_buffer = format_ethernet_header_with_length,
 408   .format_trace = format_bond_input_trace,
 409   .type = VLIB_NODE_TYPE_INTERNAL,
 410   .n_errors = BOND_INPUT_N_ERROR,
 411   .error_strings = bond_input_error_strings,
 412   .n_next_nodes = BOND_INPUT_N_NEXT,
 413   .next_nodes =
 414   {
 415     [BOND_INPUT_NEXT_DROP] = "error-drop"
 416   }
 417 };
 418
 419 VLIB_INIT_FUNCTION (bond_input_init);
 420
 421 VNET_FEATURE_INIT (bond_input, static) =
 422 {
 423   .arc_name = "device-input",
 424   .node_name = "bond-input",
 425   .runs_before = VNET_FEATURES ("ethernet-input"),
 426 };
 427 /* *INDENT-ON* */
 428
 429 static clib_error_t *
 430 bond_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
 431 {
 432   bond_main_t *bm = &bond_main;
 433   slave_if_t *sif;
 434   vlib_main_t *vm = bm->vlib_main;
 435
 436   sif = bond_get_slave_by_sw_if_index (sw_if_index);
 437   if (sif)
 438     {
 439       if (sif->lacp_enabled)
 440         return 0;
 441
 442       /* port_enabled is both admin up and hw link up */
 443       sif->port_enabled = ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) &&
 444                            vnet_sw_interface_is_link_up (vnm, sw_if_index));
 445       if (sif->port_enabled == 0)
 446         bond_disable_collecting_distributing (vm, sif);
 447       else
 448         bond_enable_collecting_distributing (vm, sif);
 449     }
 450
 451   return 0;
 452 }
 453
 454 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bond_sw_interface_up_down);
 455
 456 static clib_error_t *
 457 bond_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 458 {
 459   bond_main_t *bm = &bond_main;
 460   slave_if_t *sif;
 461   vnet_sw_interface_t *sw;
 462   vlib_main_t *vm = bm->vlib_main;
 463
 464   sw = vnet_get_hw_sw_interface (vnm, hw_if_index);
 465   sif = bond_get_slave_by_sw_if_index (sw->sw_if_index);
 466   if (sif)
 467     {
 468       if (sif->lacp_enabled)
 469         return 0;
 470
 471       /* port_enabled is both admin up and hw link up */
 472       sif->port_enabled = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) &&
 473                            vnet_sw_interface_is_admin_up (vnm,
 474                                                           sw->sw_if_index));
 475       if (sif->port_enabled == 0)
 476         bond_disable_collecting_distributing (vm, sif);
 477       else
 478         bond_enable_collecting_distributing (vm, sif);
 479     }
 480
 481   return 0;
 482 }
 483
 484 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bond_hw_interface_up_down);
 485
 486 /*
 487  * fd.io coding-style-patch-verification: ON
 488  *
 489  * Local Variables:
 490  * eval: (c-set-style "gnu")
 491  * End:
 492  */