src/vnet/feature/feature.c

   1 /*
   2  * Copyright (c) 2016 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 #include <vnet/feature/feature.h>
  17 #include <vnet/adj/adj.h>
  18
  19 vnet_feature_main_t feature_main;
  20
  21 static clib_error_t *
  22 vnet_feature_init (vlib_main_t * vm)
  23 {
  24   vnet_feature_main_t *fm = &feature_main;
  25   vnet_feature_registration_t *freg;
  26   vnet_feature_arc_registration_t *areg;
  27   u32 arc_index = 0;
  28
  29   fm->arc_index_by_name = hash_create_string (0, sizeof (uword));
  30   areg = fm->next_arc;
  31
  32   /* process feature arc registrations */
  33   while (areg)
  34     {
  35       char *s;
  36       int i = 0;
  37       areg->feature_arc_index = arc_index;
  38       if (areg->arc_index_ptr)
  39         *areg->arc_index_ptr = arc_index;
  40       hash_set_mem (fm->arc_index_by_name, areg->arc_name,
  41                     pointer_to_uword (areg));
  42
  43       /* process start nodes */
  44       while ((s = areg->start_nodes[i]))
  45         {
  46           i++;
  47         }
  48       areg->n_start_nodes = i;
  49
  50       /* next */
  51       areg = areg->next;
  52       arc_index++;
  53     }
  54
  55   vec_validate (fm->next_feature_by_arc, arc_index - 1);
  56   vec_validate (fm->feature_nodes, arc_index - 1);
  57   vec_validate (fm->feature_config_mains, arc_index - 1);
  58   vec_validate (fm->next_feature_by_name, arc_index - 1);
  59   vec_validate (fm->sw_if_index_has_features, arc_index - 1);
  60   vec_validate (fm->feature_count_by_sw_if_index, arc_index - 1);
  61
  62   freg = fm->next_feature;
  63   while (freg)
  64     {
  65       vnet_feature_registration_t *next;
  66       uword *p = hash_get_mem (fm->arc_index_by_name, freg->arc_name);
  67       if (p == 0)
  68         {
  69           /* Don't start vpp with broken features arcs */
  70           clib_warning ("Unknown feature arc '%s'", freg->arc_name);
  71           os_exit (1);
  72         }
  73
  74       areg = uword_to_pointer (p[0], vnet_feature_arc_registration_t *);
  75       arc_index = areg->feature_arc_index;
  76
  77       next = freg->next;
  78       freg->next_in_arc = fm->next_feature_by_arc[arc_index];
  79       fm->next_feature_by_arc[arc_index] = freg;
  80
  81       /* next */
  82       freg = next;
  83     }
  84
  85   areg = fm->next_arc;
  86   while (areg)
  87     {
  88       clib_error_t *error;
  89       vnet_feature_config_main_t *cm;
  90       vnet_config_main_t *vcm;
  91
  92       arc_index = areg->feature_arc_index;
  93       cm = &fm->feature_config_mains[arc_index];
  94       vcm = &cm->config_main;
  95       if ((error = vnet_feature_arc_init (vm, vcm,
  96                                           areg->start_nodes,
  97                                           areg->n_start_nodes,
  98                                           fm->next_feature_by_arc[arc_index],
  99                                           &fm->feature_nodes[arc_index])))
 100         {
 101           clib_error_report (error);
 102           os_exit (1);
 103         }
 104
 105       fm->next_feature_by_name[arc_index] =
 106         hash_create_string (0, sizeof (uword));
 107       freg = fm->next_feature_by_arc[arc_index];
 108
 109       while (freg)
 110         {
 111           hash_set_mem (fm->next_feature_by_name[arc_index],
 112                         freg->node_name, pointer_to_uword (freg));
 113           freg = freg->next_in_arc;
 114         }
 115
 116       /* next */
 117       areg = areg->next;
 118       arc_index++;
 119     }
 120
 121   return 0;
 122 }
 123
 124 VLIB_INIT_FUNCTION (vnet_feature_init);
 125
 126 u8
 127 vnet_get_feature_arc_index (const char *s)
 128 {
 129   vnet_feature_main_t *fm = &feature_main;
 130   vnet_feature_arc_registration_t *reg;
 131   uword *p;
 132
 133   p = hash_get_mem (fm->arc_index_by_name, s);
 134   if (p == 0)
 135     return ~0;
 136
 137   reg = uword_to_pointer (p[0], vnet_feature_arc_registration_t *);
 138   return reg->feature_arc_index;
 139 }
 140
 141 vnet_feature_registration_t *
 142 vnet_get_feature_reg (const char *arc_name, const char *node_name)
 143 {
 144   u8 arc_index;
 145
 146   arc_index = vnet_get_feature_arc_index (arc_name);
 147   if (arc_index == (u8) ~ 0)
 148     return 0;
 149
 150   vnet_feature_main_t *fm = &feature_main;
 151   vnet_feature_registration_t *reg;
 152   uword *p;
 153
 154   p = hash_get_mem (fm->next_feature_by_name[arc_index], node_name);
 155   if (p == 0)
 156     return 0;
 157
 158   reg = uword_to_pointer (p[0], vnet_feature_registration_t *);
 159   return reg;
 160 }
 161
 162 u32
 163 vnet_get_feature_index (u8 arc, const char *s)
 164 {
 165   vnet_feature_main_t *fm = &feature_main;
 166   vnet_feature_registration_t *reg;
 167   uword *p;
 168
 169   if (s == 0)
 170     return ~0;
 171
 172   p = hash_get_mem (fm->next_feature_by_name[arc], s);
 173   if (p == 0)
 174     return ~0;
 175
 176   reg = uword_to_pointer (p[0], vnet_feature_registration_t *);
 177   return reg->feature_index;
 178 }
 179
 180 int
 181 vnet_feature_enable_disable_with_index (u8 arc_index, u32 feature_index,
 182                                         u32 sw_if_index, int enable_disable,
 183                                         void *feature_config,
 184                                         u32 n_feature_config_bytes)
 185 {
 186   vnet_feature_main_t *fm = &feature_main;
 187   vnet_feature_config_main_t *cm;
 188   i16 feature_count;
 189   u32 ci;
 190
 191   if (arc_index == (u8) ~ 0)
 192     return VNET_API_ERROR_INVALID_VALUE;
 193
 194   if (feature_index == ~0)
 195     return VNET_API_ERROR_INVALID_VALUE_2;
 196
 197   cm = &fm->feature_config_mains[arc_index];
 198   vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
 199   ci = cm->config_index_by_sw_if_index[sw_if_index];
 200
 201   vec_validate (fm->feature_count_by_sw_if_index[arc_index], sw_if_index);
 202   feature_count = fm->feature_count_by_sw_if_index[arc_index][sw_if_index];
 203
 204   if (!enable_disable && feature_count < 1)
 205     return 0;
 206
 207   ci = (enable_disable
 208         ? vnet_config_add_feature
 209         : vnet_config_del_feature)
 210     (vlib_get_main (), &cm->config_main, ci, feature_index, feature_config,
 211      n_feature_config_bytes);
 212   if (ci == ~0)
 213     {
 214       return 0;
 215     }
 216   cm->config_index_by_sw_if_index[sw_if_index] = ci;
 217
 218   /* update feature count */
 219   enable_disable = (enable_disable > 0);
 220   feature_count += enable_disable ? 1 : -1;
 221   ASSERT (feature_count >= 0);
 222
 223   fm->sw_if_index_has_features[arc_index] =
 224     clib_bitmap_set (fm->sw_if_index_has_features[arc_index], sw_if_index,
 225                      (feature_count > 0));
 226   adj_feature_update (sw_if_index, arc_index, (feature_count > 0));
 227
 228   fm->feature_count_by_sw_if_index[arc_index][sw_if_index] = feature_count;
 229   return 0;
 230 }
 231
 232 int
 233 vnet_feature_enable_disable (const char *arc_name, const char *node_name,
 234                              u32 sw_if_index, int enable_disable,
 235                              void *feature_config, u32 n_feature_config_bytes)
 236 {
 237   u32 feature_index;
 238   u8 arc_index;
 239
 240   arc_index = vnet_get_feature_arc_index (arc_name);
 241
 242   if (arc_index == (u8) ~ 0)
 243     return VNET_API_ERROR_INVALID_VALUE;
 244
 245   feature_index = vnet_get_feature_index (arc_index, node_name);
 246
 247   return vnet_feature_enable_disable_with_index (arc_index, feature_index,
 248                                                  sw_if_index, enable_disable,
 249                                                  feature_config,
 250                                                  n_feature_config_bytes);
 251 }
 252
 253
 254 /** Display the set of available driver features.
 255     Useful for verifying that expected features are present
 256 */
 257
 258 static clib_error_t *
 259 show_features_command_fn (vlib_main_t * vm,
 260                           unformat_input_t * input, vlib_cli_command_t * cmd)
 261 {
 262   vnet_feature_main_t *fm = &feature_main;
 263   vnet_feature_arc_registration_t *areg;
 264   vnet_feature_registration_t *freg;
 265
 266   vlib_cli_output (vm, "Available feature paths");
 267
 268   areg = fm->next_arc;
 269   while (areg)
 270     {
 271       vlib_cli_output (vm, "%s:", areg->arc_name);
 272       freg = fm->next_feature_by_arc[areg->feature_arc_index];
 273       while (freg)
 274         {
 275           vlib_cli_output (vm, "  %s\n", freg->node_name);
 276           freg = freg->next_in_arc;
 277         }
 278
 279
 280       /* next */
 281       areg = areg->next;
 282     }
 283
 284   return 0;
 285 }
 286
 287 /*?
 288  * Display the set of available driver features
 289  *
 290  * @cliexpar
 291  * Example:
 292  * @cliexcmd{show ip features}
 293  * @cliexend
 294  * @endparblock
 295 ?*/
 296 /* *INDENT-OFF* */
 297 VLIB_CLI_COMMAND (show_features_command, static) = {
 298   .path = "show features",
 299   .short_help = "show features",
 300   .function = show_features_command_fn,
 301 };
 302 /* *INDENT-ON* */
 303
 304 /** Display the set of driver features configured on a specific interface
 305   * Called by "show interface" handler
 306  */
 307
 308 void
 309 vnet_interface_features_show (vlib_main_t * vm, u32 sw_if_index)
 310 {
 311   vnet_feature_main_t *fm = &feature_main;
 312   u32 node_index, current_config_index;
 313   u16 feature_arc;
 314   vnet_feature_config_main_t *cm = fm->feature_config_mains;
 315   vnet_feature_arc_registration_t *areg;
 316   vnet_config_main_t *vcm;
 317   vnet_config_t *cfg;
 318   u32 cfg_index;
 319   vnet_config_feature_t *feat;
 320   vlib_node_t *n;
 321   int i;
 322
 323   vlib_cli_output (vm, "Driver feature paths configured on %U...",
 324                    format_vnet_sw_if_index_name,
 325                    vnet_get_main (), sw_if_index);
 326
 327   areg = fm->next_arc;
 328   while (areg)
 329     {
 330       feature_arc = areg->feature_arc_index;
 331       vcm = &(cm[feature_arc].config_main);
 332
 333       vlib_cli_output (vm, "\n%s:", areg->arc_name);
 334       areg = areg->next;
 335
 336       if (NULL == cm[feature_arc].config_index_by_sw_if_index ||
 337           vec_len (cm[feature_arc].config_index_by_sw_if_index) <=
 338           sw_if_index)
 339         {
 340           vlib_cli_output (vm, "  none configured");
 341           continue;
 342         }
 343
 344       current_config_index =
 345         vec_elt (cm[feature_arc].config_index_by_sw_if_index, sw_if_index);
 346
 347       if (current_config_index == ~0)
 348         {
 349           vlib_cli_output (vm, "  none configured");
 350           continue;
 351         }
 352
 353       ASSERT (current_config_index
 354               < vec_len (vcm->config_pool_index_by_user_index));
 355
 356       cfg_index = vcm->config_pool_index_by_user_index[current_config_index];
 357       cfg = pool_elt_at_index (vcm->config_pool, cfg_index);
 358
 359       for (i = 0; i < vec_len (cfg->features); i++)
 360         {
 361           feat = cfg->features + i;
 362           node_index = feat->node_index;
 363           n = vlib_get_node (vm, node_index);
 364           vlib_cli_output (vm, "  %v", n->name);
 365         }
 366     }
 367 }
 368
 369 static clib_error_t *
 370 set_interface_features_command_fn (vlib_main_t * vm,
 371                                    unformat_input_t * input,
 372                                    vlib_cli_command_t * cmd)
 373 {
 374   vnet_main_t *vnm = vnet_get_main ();
 375   unformat_input_t _line_input, *line_input = &_line_input;
 376   clib_error_t *error = 0;
 377
 378   u8 *arc_name = 0;
 379   u8 *feature_name = 0;
 380   u32 sw_if_index = ~0;
 381   u8 enable = 1;
 382
 383   /* Get a line of input. */
 384   if (!unformat_user (input, unformat_line_input, line_input))
 385     goto done;
 386
 387   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
 388     {
 389       if (unformat
 390           (line_input, "%U %v", unformat_vnet_sw_interface, vnm, &sw_if_index,
 391            &feature_name))
 392         ;
 393       else if (unformat (line_input, "arc %v", &arc_name))
 394         ;
 395       else if (unformat (line_input, "disable"))
 396         enable = 0;
 397       else
 398         {
 399           error = unformat_parse_error (line_input);
 400           goto done;
 401         }
 402     }
 403
 404   if (sw_if_index == ~0)
 405     {
 406       error = clib_error_return (0, "Interface not specified...");
 407       goto done;
 408     }
 409
 410   vec_add1 (arc_name, 0);
 411   vec_add1 (feature_name, 0);
 412
 413   vnet_feature_registration_t *reg;
 414   reg =
 415     vnet_get_feature_reg ((const char *) arc_name,
 416                           (const char *) feature_name);
 417   if (reg == 0)
 418     {
 419       error = clib_error_return (0, "Unknown feature...");
 420       goto done;
 421     }
 422   if (reg->enable_disable_cb)
 423     error = reg->enable_disable_cb (sw_if_index, enable);
 424   if (!error)
 425     vnet_feature_enable_disable ((const char *) arc_name,
 426                                  (const char *) feature_name, sw_if_index,
 427                                  enable, 0, 0);
 428
 429 done:
 430   vec_free (feature_name);
 431   vec_free (arc_name);
 432   unformat_free (line_input);
 433   return error;
 434 }
 435
 436 /*?
 437  * Set feature for given interface
 438  *
 439  * @cliexpar
 440  * Example:
 441  * @cliexcmd{set interface feature GigabitEthernet2/0/0 ip4_flow_classify arc ip4_unicast}
 442  * @cliexend
 443  * @endparblock
 444 ?*/
 445 /* *INDENT-OFF* */
 446 VLIB_CLI_COMMAND (set_interface_feature_command, static) = {
 447   .path = "set interface feature",
 448   .short_help = "set interface feature <intfc> <feature_name> arc <arc_name> "
 449       "[disable]",
 450   .function = set_interface_features_command_fn,
 451 };
 452 /* *INDENT-ON* */
 453
 454 /*
 455  * fd.io coding-style-patch-verification: ON
 456  *
 457  * Local Variables:
 458  * eval: (c-set-style "gnu")
 459  * End:
 460  */