vnet/vnet/l2/l2_patch.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 #include <vlib/vlib.h>
  16 #include <vnet/vnet.h>
  17 #include <vnet/pg/pg.h>
  18 #include <vnet/ethernet/ethernet.h>
  19 #include <vnet/feature/feature.h>
  20 #include <vppinfra/error.h>
  21
  22 typedef struct
  23 {
  24   /* vector of dispositions, indexed by rx_sw_if_index */
  25   u32 *tx_next_by_rx_sw_if_index;
  26   u32 *tx_sw_if_index_by_rx_sw_if_index;
  27
  28   /* convenience variables */
  29   vlib_main_t *vlib_main;
  30   vnet_main_t *vnet_main;
  31 } l2_patch_main_t;
  32
  33 typedef struct
  34 {
  35   u32 rx_sw_if_index;
  36   u32 tx_sw_if_index;
  37 } l2_patch_trace_t;
  38
  39 /* packet trace format function */
  40 static u8 *
  41 format_l2_patch_trace (u8 * s, va_list * args)
  42 {
  43   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  44   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  45   l2_patch_trace_t *t = va_arg (*args, l2_patch_trace_t *);
  46
  47   s = format (s, "L2_PATCH: rx %d tx %d", t->rx_sw_if_index,
  48               t->tx_sw_if_index);
  49   return s;
  50 }
  51
  52 l2_patch_main_t l2_patch_main;
  53
  54 static vlib_node_registration_t l2_patch_node;
  55
  56 #define foreach_l2_patch_error                  \
  57 _(PATCHED, "L2 patch packets")                  \
  58 _(DROPPED, "L2 patch misconfigured drops")
  59
  60 typedef enum
  61 {
  62 #define _(sym,str) L2_PATCH_ERROR_##sym,
  63   foreach_l2_patch_error
  64 #undef _
  65     L2_PATCH_N_ERROR,
  66 } l2_patch_error_t;
  67
  68 static char *l2_patch_error_strings[] = {
  69 #define _(sym,string) string,
  70   foreach_l2_patch_error
  71 #undef _
  72 };
  73
  74 typedef enum
  75 {
  76   L2_PATCH_NEXT_DROP,
  77   L2_PATCH_N_NEXT,
  78 } l2_patch_next_t;
  79
  80 static uword
  81 l2_patch_node_fn (vlib_main_t * vm,
  82                   vlib_node_runtime_t * node, vlib_frame_t * frame)
  83 {
  84   u32 n_left_from, *from, *to_next;
  85   l2_patch_next_t next_index;
  86   l2_patch_main_t *l2pm = &l2_patch_main;
  87   vlib_node_t *n = vlib_get_node (vm, l2_patch_node.index);
  88   u32 node_counter_base_index = n->error_heap_index;
  89   vlib_error_main_t *em = &vm->error_main;
  90
  91   from = vlib_frame_vector_args (frame);
  92   n_left_from = frame->n_vectors;
  93   next_index = node->cached_next_index;
  94
  95   while (n_left_from > 0)
  96     {
  97       u32 n_left_to_next;
  98
  99       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 100
 101       while (n_left_from >= 4 && n_left_to_next >= 2)
 102         {
 103           u32 bi0, bi1;
 104           vlib_buffer_t *b0, *b1;
 105           u32 next0, next1;
 106           u32 sw_if_index0, sw_if_index1;
 107
 108           /* Prefetch next iteration. */
 109           {
 110             vlib_buffer_t *p2, *p3;
 111
 112             p2 = vlib_get_buffer (vm, from[2]);
 113             p3 = vlib_get_buffer (vm, from[3]);
 114
 115             vlib_prefetch_buffer_header (p2, LOAD);
 116             vlib_prefetch_buffer_header (p3, LOAD);
 117
 118             /* So stupid / simple, we don't need to prefetch data */
 119           }
 120
 121           /* speculatively enqueue b0 and b1 to the current next frame */
 122           to_next[0] = bi0 = from[0];
 123           to_next[1] = bi1 = from[1];
 124           from += 2;
 125           to_next += 2;
 126           n_left_from -= 2;
 127           n_left_to_next -= 2;
 128
 129           b0 = vlib_get_buffer (vm, bi0);
 130           b1 = vlib_get_buffer (vm, bi1);
 131
 132           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 133           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
 134
 135           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0);
 136           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0);
 137           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index1] != ~0);
 138           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1] != ~0);
 139
 140           next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0];
 141           next1 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index1];
 142           vnet_buffer (b0)->sw_if_index[VLIB_TX] =
 143             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
 144           vnet_buffer (b1)->sw_if_index[VLIB_TX] =
 145             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1];
 146
 147           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
 148             {
 149               if (b0->flags & VLIB_BUFFER_IS_TRACED)
 150                 {
 151                   l2_patch_trace_t *t =
 152                     vlib_add_trace (vm, node, b0, sizeof (*t));
 153                   t->rx_sw_if_index = sw_if_index0;
 154                   t->tx_sw_if_index =
 155                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
 156                 }
 157               if (b1->flags & VLIB_BUFFER_IS_TRACED)
 158                 {
 159                   l2_patch_trace_t *t =
 160                     vlib_add_trace (vm, node, b1, sizeof (*t));
 161                   t->rx_sw_if_index = sw_if_index1;
 162                   t->tx_sw_if_index =
 163                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1];
 164                 }
 165             }
 166
 167           /* verify speculative enqueues, maybe switch current next frame */
 168           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 169                                            to_next, n_left_to_next,
 170                                            bi0, bi1, next0, next1);
 171         }
 172
 173       while (n_left_from > 0 && n_left_to_next > 0)
 174         {
 175           u32 bi0;
 176           vlib_buffer_t *b0;
 177           u32 next0;
 178           u32 sw_if_index0;
 179
 180           /* speculatively enqueue b0 to the current next frame */
 181           bi0 = from[0];
 182           to_next[0] = bi0;
 183           from += 1;
 184           to_next += 1;
 185           n_left_from -= 1;
 186           n_left_to_next -= 1;
 187
 188           b0 = vlib_get_buffer (vm, bi0);
 189
 190           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 191
 192           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0);
 193           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0);
 194
 195           next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0];
 196           vnet_buffer (b0)->sw_if_index[VLIB_TX] =
 197             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
 198
 199           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
 200             {
 201               if (b0->flags & VLIB_BUFFER_IS_TRACED)
 202                 {
 203                   l2_patch_trace_t *t =
 204                     vlib_add_trace (vm, node, b0, sizeof (*t));
 205                   t->rx_sw_if_index = sw_if_index0;
 206                   t->tx_sw_if_index =
 207                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
 208                 }
 209             }
 210
 211           /* verify speculative enqueue, maybe switch current next frame */
 212           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 213                                            to_next, n_left_to_next,
 214                                            bi0, next0);
 215         }
 216
 217       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 218     }
 219
 220   em->counters[node_counter_base_index + L2_PATCH_ERROR_PATCHED] +=
 221     frame->n_vectors;
 222
 223   return frame->n_vectors;
 224 }
 225
 226 /* *INDENT-OFF* */
 227 VLIB_REGISTER_NODE (l2_patch_node, static) = {
 228   .function = l2_patch_node_fn,
 229   .name = "l2-patch",
 230   .vector_size = sizeof (u32),
 231   .format_trace = format_l2_patch_trace,
 232   .type = VLIB_NODE_TYPE_INTERNAL,
 233
 234   .n_errors = ARRAY_LEN(l2_patch_error_strings),
 235   .error_strings = l2_patch_error_strings,
 236
 237   .n_next_nodes = L2_PATCH_N_NEXT,
 238
 239   /* edit / add dispositions here */
 240   .next_nodes = {
 241         [L2_PATCH_NEXT_DROP] = "error-drop",
 242   },
 243 };
 244 /* *INDENT-ON* */
 245
 246 VLIB_NODE_FUNCTION_MULTIARCH (l2_patch_node, l2_patch_node_fn)
 247      int vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index,
 248                                 int is_add)
 249 {
 250   l2_patch_main_t *l2pm = &l2_patch_main;
 251   vnet_hw_interface_t *rxhi, *txhi;
 252   u32 tx_next_index;
 253
 254   /*
 255    * We assume that the API msg handler has used 2x VALIDATE_SW_IF_INDEX
 256    * macros...
 257    */
 258
 259   rxhi = vnet_get_sup_hw_interface (l2pm->vnet_main, rx_sw_if_index);
 260
 261   /* Make sure caller didn't pass a vlan subif, etc. */
 262   if (rxhi->sw_if_index != rx_sw_if_index)
 263     return VNET_API_ERROR_INVALID_SW_IF_INDEX;
 264
 265   txhi = vnet_get_sup_hw_interface (l2pm->vnet_main, tx_sw_if_index);
 266   if (txhi->sw_if_index != tx_sw_if_index)
 267     return VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
 268
 269   if (is_add)
 270     {
 271       tx_next_index = vlib_node_add_next (l2pm->vlib_main,
 272                                           l2_patch_node.index,
 273                                           txhi->output_node_index);
 274
 275       vec_validate_init_empty (l2pm->tx_next_by_rx_sw_if_index,
 276                                rx_sw_if_index, ~0);
 277
 278       l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = tx_next_index;
 279       vec_validate_init_empty (l2pm->tx_sw_if_index_by_rx_sw_if_index,
 280                                rx_sw_if_index, ~0);
 281       l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index]
 282         = txhi->sw_if_index;
 283
 284       ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index,
 285                           ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
 286
 287       vnet_feature_enable_disable ("device-input", "l2-patch",
 288                                    rxhi->hw_if_index, 1, 0, 0);
 289     }
 290   else
 291     {
 292       ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index,
 293                           0 /* disable promiscuous mode */ );
 294
 295       vnet_feature_enable_disable ("device-input", "l2-patch",
 296                                    rxhi->hw_if_index, 0, 0, 0);
 297       if (vec_len (l2pm->tx_next_by_rx_sw_if_index) > rx_sw_if_index)
 298         {
 299           l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = ~0;
 300           l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = ~0;
 301         }
 302     }
 303
 304   return 0;
 305 }
 306
 307 static clib_error_t *
 308 test_patch_command_fn (vlib_main_t * vm,
 309                        unformat_input_t * input, vlib_cli_command_t * cmd)
 310 {
 311   l2_patch_main_t *l2pm = &l2_patch_main;
 312   unformat_input_t _line_input, *line_input = &_line_input;
 313   u32 rx_sw_if_index, tx_sw_if_index;
 314   int rv;
 315   int rx_set = 0;
 316   int tx_set = 0;
 317   int is_add = 1;
 318
 319   /* Get a line of input. */
 320   if (!unformat_user (input, unformat_line_input, line_input))
 321     return 0;
 322
 323   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
 324     {
 325       if (unformat (line_input, "rx %U", unformat_vnet_sw_interface,
 326                     l2pm->vnet_main, &rx_sw_if_index))
 327         rx_set = 1;
 328       else if (unformat (line_input, "tx %U", unformat_vnet_sw_interface,
 329                          l2pm->vnet_main, &tx_sw_if_index))
 330         tx_set = 1;
 331       else if (unformat (line_input, "del"))
 332         is_add = 0;
 333       else
 334         break;
 335     }
 336
 337   if (rx_set == 0)
 338     return clib_error_return (0, "rx interface not set");
 339
 340   if (tx_set == 0)
 341     return clib_error_return (0, "tx interface not set");
 342
 343   rv = vnet_l2_patch_add_del (rx_sw_if_index, tx_sw_if_index, is_add);
 344
 345   switch (rv)
 346     {
 347     case 0:
 348       break;
 349
 350     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
 351       return clib_error_return (0, "rx interface not a physical port");
 352
 353     case VNET_API_ERROR_INVALID_SW_IF_INDEX_2:
 354       return clib_error_return (0, "tx interface not a physical port");
 355
 356     default:
 357       return clib_error_return
 358         (0, "WARNING: vnet_l2_patch_add_del returned %d", rv);
 359     }
 360
 361   return 0;
 362 }
 363
 364 /*?
 365  * Create or delete a Layer 2 patch.
 366  *
 367  * @cliexpar
 368  * @cliexstart{test l2patch rx <intfc> tx <intfc> [del]}
 369  * @cliexend
 370  * @todo This is incomplete. This needs a detailed description and a
 371  * practical example.
 372 ?*/
 373 /* *INDENT-OFF* */
 374 VLIB_CLI_COMMAND (test_patch_command, static) = {
 375     .path = "test l2patch",
 376     .short_help = "test l2patch rx <intfc> tx <intfc> [del]",
 377     .function = test_patch_command_fn,
 378 };
 379 /* *INDENT-ON* */
 380
 381 /** Display the contents of the l2patch table. */
 382 static clib_error_t *
 383 show_l2patch (vlib_main_t * vm,
 384               unformat_input_t * input, vlib_cli_command_t * cmd)
 385 {
 386   l2_patch_main_t *l2pm = &l2_patch_main;
 387   u32 rx_sw_if_index;
 388   u32 no_entries = 1;
 389
 390   ASSERT (vec_len (l2pm->tx_next_by_rx_sw_if_index) ==
 391           vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index));
 392
 393   for (rx_sw_if_index = 0;
 394        rx_sw_if_index < vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index);
 395        rx_sw_if_index++)
 396     {
 397       u32 tx_sw_if_index =
 398         l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index];
 399       if (tx_sw_if_index != ~0)
 400         {
 401           no_entries = 0;
 402           vlib_cli_output (vm, "%26U -> %U",
 403                            format_vnet_sw_if_index_name,
 404                            l2pm->vnet_main, rx_sw_if_index,
 405                            format_vnet_sw_if_index_name,
 406                            l2pm->vnet_main, tx_sw_if_index);
 407         }
 408     }
 409
 410   if (no_entries)
 411     vlib_cli_output (vm, "no l2patch entries");
 412
 413   return 0;
 414 }
 415
 416 /*?
 417  * Show Layer 2 patch entries.
 418  *
 419  * @cliexpar
 420  * @cliexstart{show l2patch}
 421  * @cliexend
 422  * @todo This is incomplete. This needs a detailed description and a
 423  * practical example.
 424 ?*/
 425 /* *INDENT-OFF* */
 426 VLIB_CLI_COMMAND (show_l2patch_cli, static) = {
 427   .path = "show l2patch",
 428   .short_help = "Show l2 interface cross-connect entries",
 429   .function = show_l2patch,
 430 };
 431 /* *INDENT-ON* */
 432
 433 clib_error_t *
 434 l2_patch_init (vlib_main_t * vm)
 435 {
 436   l2_patch_main_t *mp = &l2_patch_main;
 437
 438   mp->vlib_main = vm;
 439   mp->vnet_main = vnet_get_main ();
 440
 441   return 0;
 442 }
 443
 444 VLIB_INIT_FUNCTION (l2_patch_init);
 445
 446 /*
 447  * fd.io coding-style-patch-verification: ON
 448  *
 449  * Local Variables:
 450  * eval: (c-set-style "gnu")
 451  * End:
 452  */