src/surf/surf_routing_floyd.c

   1 /* Copyright (c) 2009, 2010, 2011. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "surf_routing_private.h"
   8
   9 /* Global vars */
  10 extern routing_global_t global_routing;
  11 extern routing_component_t current_routing;
  12 extern model_type_t current_routing_model;
  13
  14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_floyd, surf, "Routing part of surf");
  15
  16 #define TO_FLOYD_COST(i,j) (routing->cost_table)[(i)+(j)*table_size]
  17 #define TO_FLOYD_PRED(i,j) (routing->predecessor_table)[(i)+(j)*table_size]
  18 #define TO_FLOYD_LINK(i,j) (routing->link_table)[(i)+(j)*table_size]
  19
  20 /* Routing model structure */
  21
  22 typedef struct {
  23   s_routing_component_t generic_routing;
  24   /* vars for calculate the floyd algorith. */
  25   int *predecessor_table;
  26   double *cost_table;
  27   route_extended_t *link_table; /* char* -> int* */
  28 } s_routing_component_floyd_t, *routing_component_floyd_t;
  29
  30 static route_extended_t floyd_get_route(routing_component_t rc,
  31                                         const char *src, const char *dst);
  32
  33 /* Business methods */
  34 static xbt_dynar_t floyd_get_onelink_routes(routing_component_t rc)
  35 {
  36   xbt_dynar_t ret = xbt_dynar_new(sizeof(onelink_t), xbt_free);
  37
  38   routing_component_floyd_t routing = (routing_component_floyd_t) rc;
  39   //size_t table_size = xbt_dict_length(routing->generic_routing.to_index);
  40   xbt_dict_cursor_t c1 = NULL, c2 = NULL;
  41   char *k1, *d1, *k2, *d2;
  42   xbt_dict_foreach(routing->generic_routing.to_index, c1, k1, d1) {
  43     xbt_dict_foreach(routing->generic_routing.to_index, c2, k2, d2) {
  44       route_extended_t route = floyd_get_route(rc, k1, k2);
  45       if (route) {
  46         if (xbt_dynar_length(route->generic_route.link_list) == 1) {
  47           void *link =
  48               *(void **) xbt_dynar_get_ptr(route->generic_route.link_list,
  49                                            0);
  50           onelink_t onelink = xbt_new0(s_onelink_t, 1);
  51           onelink->link_ptr = link;
  52           if (routing->generic_routing.hierarchy == SURF_ROUTING_BASE) {
  53             onelink->src = xbt_strdup(k1);
  54             onelink->dst = xbt_strdup(k2);
  55           } else if (routing->generic_routing.hierarchy ==
  56                      SURF_ROUTING_RECURSIVE) {
  57             onelink->src = xbt_strdup(route->src_gateway);
  58             onelink->dst = xbt_strdup(route->dst_gateway);
  59           }
  60           xbt_dynar_push(ret, &onelink);
  61         }
  62       }
  63     }
  64   }
  65   return ret;
  66 }
  67
  68 static route_extended_t floyd_get_route(routing_component_t rc,
  69                                         const char *src, const char *dst)
  70 {
  71   xbt_assert(rc && src
  72               && dst,
  73               "Invalid params for \"get_route\" function at AS \"%s\"",
  74               rc->name);
  75
  76   /* set utils vars */
  77   routing_component_floyd_t routing = (routing_component_floyd_t) rc;
  78   size_t table_size = xbt_dict_length(routing->generic_routing.to_index);
  79
  80   generic_src_dst_check(rc, src, dst);
  81   int *src_id = xbt_dict_get_or_null(routing->generic_routing.to_index, src);
  82   int *dst_id = xbt_dict_get_or_null(routing->generic_routing.to_index, dst);
  83   xbt_assert(src_id
  84               && dst_id,
  85               "Ask for route \"from\"(%s)  or \"to\"(%s) no found in the local table",
  86               src, dst);
  87
  88   /* create a result route */
  89   route_extended_t new_e_route = xbt_new0(s_route_extended_t, 1);
  90   new_e_route->generic_route.link_list =
  91       xbt_dynar_new(global_routing->size_of_link, NULL);
  92   new_e_route->src_gateway = NULL;
  93   new_e_route->dst_gateway = NULL;
  94
  95   int first = 1;
  96   int pred = *dst_id;
  97   int prev_pred = 0;
  98   char *gw_src = NULL, *gw_dst =
  99       NULL, *prev_gw_src, *prev_gw_dst, *first_gw = NULL;
 100   unsigned int cpt;
 101   void *link;
 102   xbt_dynar_t links;
 103
 104   do {
 105     prev_pred = pred;
 106     pred = TO_FLOYD_PRED(*src_id, pred);
 107     if (pred == -1)             /* if no pred in route -> no route to host */
 108       break;
 109     xbt_assert(TO_FLOYD_LINK(pred, prev_pred),
 110                 "Invalid link for the route between \"%s\" or \"%s\"", src,
 111                 dst);
 112
 113     prev_gw_src = gw_src;
 114     prev_gw_dst = gw_dst;
 115
 116     route_extended_t e_route = TO_FLOYD_LINK(pred, prev_pred);
 117     gw_src = e_route->src_gateway;
 118     gw_dst = e_route->dst_gateway;
 119
 120     if (first)
 121       first_gw = gw_dst;
 122
 123     if (rc->hierarchy == SURF_ROUTING_RECURSIVE && !first
 124         && strcmp(gw_dst, prev_gw_src)) {
 125       xbt_dynar_t e_route_as_to_as =
 126           (*(global_routing->get_route)) (gw_dst, prev_gw_src);
 127       xbt_assert(e_route_as_to_as, "no route between \"%s\" and \"%s\"",
 128                   gw_dst, prev_gw_src);
 129       links = e_route_as_to_as;
 130       int pos = 0;
 131       xbt_dynar_foreach(links, cpt, link) {
 132         xbt_dynar_insert_at(new_e_route->generic_route.link_list, pos,
 133                             &link);
 134         pos++;
 135       }
 136     }
 137
 138     links = e_route->generic_route.link_list;
 139     xbt_dynar_foreach(links, cpt, link) {
 140       xbt_dynar_unshift(new_e_route->generic_route.link_list, &link);
 141     }
 142     first = 0;
 143
 144   } while (pred != *src_id);
 145   xbt_assert(pred != -1, "no route from host %d to %d (\"%s\" to \"%s\")",
 146               *src_id, *dst_id, src, dst);
 147
 148   if (rc->hierarchy == SURF_ROUTING_RECURSIVE) {
 149     new_e_route->src_gateway = xbt_strdup(gw_src);
 150     new_e_route->dst_gateway = xbt_strdup(first_gw);
 151   }
 152
 153   return new_e_route;
 154 }
 155
 156 static void floyd_finalize(routing_component_t rc)
 157 {
 158   routing_component_floyd_t routing = (routing_component_floyd_t) rc;
 159   int i, j;
 160   size_t table_size;
 161   if (routing) {
 162     table_size = xbt_dict_length(routing->generic_routing.to_index);
 163     /* Delete link_table */
 164     for (i = 0; i < table_size; i++)
 165       for (j = 0; j < table_size; j++)
 166         generic_free_extended_route(TO_FLOYD_LINK(i, j));
 167     xbt_free(routing->link_table);
 168     /* Delete bypass dict */
 169     xbt_dict_free(&routing->generic_routing.bypassRoutes);
 170     /* Delete index dict */
 171     xbt_dict_free(&(routing->generic_routing.to_index));
 172     /* Delete dictionary index dict, predecessor and links table */
 173     xbt_free(routing->predecessor_table);
 174     /* Delete structure */
 175     xbt_free(rc);
 176   }
 177 }
 178
 179 void *model_floyd_create(void)
 180 {
 181   routing_component_floyd_t new_component =
 182       xbt_new0(s_routing_component_floyd_t, 1);
 183   new_component->generic_routing.set_processing_unit =
 184       generic_set_processing_unit;
 185   new_component->generic_routing.set_autonomous_system =
 186       generic_set_autonomous_system;
 187   new_component->generic_routing.set_route = model_floyd_set_route;
 188   new_component->generic_routing.set_ASroute = model_floyd_set_route;
 189   new_component->generic_routing.set_bypassroute = generic_set_bypassroute;
 190   new_component->generic_routing.get_route = floyd_get_route;
 191   new_component->generic_routing.get_latency = generic_get_link_latency;
 192   new_component->generic_routing.get_onelink_routes =
 193       floyd_get_onelink_routes;
 194   new_component->generic_routing.get_bypass_route =
 195       generic_get_bypassroute;
 196   new_component->generic_routing.finalize = floyd_finalize;
 197   new_component->generic_routing.to_index = xbt_dict_new();
 198   new_component->generic_routing.bypassRoutes = xbt_dict_new();
 199   new_component->generic_routing.get_network_element_type = get_network_element_type;
 200   return new_component;
 201 }
 202
 203 void model_floyd_load(void)
 204 {
 205   /* use "surfxml_add_callback" to add a parse function call */
 206 }
 207
 208 void model_floyd_unload(void)
 209 {
 210   /* use "surfxml_del_callback" to remove a parse function call */
 211 }
 212
 213 void model_floyd_end(void)
 214 {
 215
 216         routing_component_floyd_t routing =
 217           ((routing_component_floyd_t) current_routing);
 218
 219         unsigned int i, j, a, b, c;
 220
 221         /* set the size of table routing */
 222         size_t table_size = xbt_dict_length(routing->generic_routing.to_index);
 223
 224         if(!routing->link_table)
 225         {
 226                 /* Create Cost, Predecessor and Link tables */
 227                 routing->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 228                 routing->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 229                 routing->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 230
 231                 /* Initialize costs and predecessors */
 232                 for (i = 0; i < table_size; i++)
 233                 for (j = 0; j < table_size; j++) {
 234                   TO_FLOYD_COST(i, j) = DBL_MAX;
 235                   TO_FLOYD_PRED(i, j) = -1;
 236                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 237                 }
 238         }
 239
 240         /* Add the loopback if needed */
 241         if (current_routing->hierarchy == SURF_ROUTING_BASE) {
 242                 for (i = 0; i < table_size; i++) {
 243                   route_extended_t e_route = TO_FLOYD_LINK(i, i);
 244                   if (!e_route) {
 245                         e_route = xbt_new0(s_route_extended_t, 1);
 246                         e_route->src_gateway = NULL;
 247                         e_route->dst_gateway = NULL;
 248                         e_route->generic_route.link_list =
 249                                 xbt_dynar_new(global_routing->size_of_link, NULL);
 250                         xbt_dynar_push(e_route->generic_route.link_list,
 251                                                    &global_routing->loopback);
 252                         TO_FLOYD_LINK(i, i) = e_route;
 253                         TO_FLOYD_PRED(i, i) = i;
 254                         TO_FLOYD_COST(i, i) = 1;
 255                   }
 256                 }
 257         }
 258         /* Calculate path costs */
 259         for (c = 0; c < table_size; c++) {
 260                 for (a = 0; a < table_size; a++) {
 261                   for (b = 0; b < table_size; b++) {
 262                         if (TO_FLOYD_COST(a, c) < DBL_MAX && TO_FLOYD_COST(c, b) < DBL_MAX) {
 263                           if (TO_FLOYD_COST(a, b) == DBL_MAX ||
 264                                   (TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b) <
 265                                    TO_FLOYD_COST(a, b))) {
 266                                 TO_FLOYD_COST(a, b) =
 267                                         TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b);
 268                                 TO_FLOYD_PRED(a, b) = TO_FLOYD_PRED(c, b);
 269                           }
 270                         }
 271                   }
 272                 }
 273         }
 274 }
 275
 276 void model_floyd_set_route(routing_component_t rc, const char *src,
 277         const char *dst, name_route_extended_t route)
 278 {
 279         routing_component_floyd_t routing = (routing_component_floyd_t) rc;
 280
 281         /* set the size of table routing */
 282         size_t table_size = xbt_dict_length(rc->to_index);
 283         int *src_id, *dst_id;
 284         int i,j;
 285
 286         src_id = xbt_dict_get_or_null(rc->to_index, src);
 287         dst_id = xbt_dict_get_or_null(rc->to_index, dst);
 288
 289         xbt_assert(src_id, "Network elements %s not found", src);
 290         xbt_assert(dst_id, "Network elements %s not found", dst);
 291
 292         if(!routing->link_table)
 293         {
 294                 /* Create Cost, Predecessor and Link tables */
 295                 routing->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 296                 routing->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 297                 routing->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 298
 299                 /* Initialize costs and predecessors */
 300                 for (i = 0; i < table_size; i++)
 301                 for (j = 0; j < table_size; j++) {
 302                   TO_FLOYD_COST(i, j) = DBL_MAX;
 303                   TO_FLOYD_PRED(i, j) = -1;
 304                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 305                 }
 306         }
 307
 308         if(TO_FLOYD_LINK(*src_id, *dst_id))
 309         {
 310                 if(!route->dst_gateway && !route->src_gateway)
 311                         XBT_DEBUG("See Route from \"%s\" to \"%s\"", src, dst);
 312                 else
 313                         XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 314                                  route->src_gateway, dst, route->dst_gateway);
 315                 char * link_name;
 316                 unsigned int cpt;
 317                 xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 318                 xbt_dynar_foreach(route->generic_route.link_list,cpt,link_name)
 319                 {
 320                         void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 321                         xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 322                         xbt_dynar_push(link_route_to_test,&link);
 323                 }
 324                 xbt_assert(!xbt_dynar_compare(
 325                           (void*)TO_FLOYD_LINK(*src_id, *dst_id)->generic_route.link_list,
 326                           (void*)link_route_to_test,
 327                           (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 328                           "The route between \"%s\" and \"%s\" already exists", src,dst);
 329         }
 330         else
 331         {
 332                 if(!route->dst_gateway && !route->src_gateway)
 333                   XBT_DEBUG("Load Route from \"%s\" to \"%s\"", src, dst);
 334                 else{
 335                         XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 336                                  route->src_gateway, dst, route->dst_gateway);
 337                         if(global_routing->get_network_element_type((const char*)route->dst_gateway) == SURF_NETWORK_ELEMENT_NULL)
 338                                 xbt_die("The dst_gateway '%s' does not exist!",route->dst_gateway);
 339                         if(global_routing->get_network_element_type((const char*)route->src_gateway) == SURF_NETWORK_ELEMENT_NULL)
 340                                 xbt_die("The src_gateway '%s' does not exist!",route->src_gateway);
 341                 }
 342             TO_FLOYD_LINK(*src_id, *dst_id) =
 343                         generic_new_extended_route(rc->hierarchy, route, 1);
 344             TO_FLOYD_PRED(*src_id, *dst_id) = *src_id;
 345             TO_FLOYD_COST(*src_id, *dst_id) =
 346                         ((TO_FLOYD_LINK(*src_id, *dst_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 347         }
 348
 349         if( A_surfxml_route_symmetrical == A_surfxml_route_symmetrical_YES
 350                 || A_surfxml_ASroute_symmetrical == A_surfxml_ASroute_symmetrical_YES )
 351         {
 352                 if(TO_FLOYD_LINK(*dst_id, *src_id))
 353                 {
 354                         if(!route->dst_gateway && !route->src_gateway)
 355                           XBT_DEBUG("See Route from \"%s\" to \"%s\"", dst, src);
 356                         else
 357                           XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 358                                          route->src_gateway, src, route->dst_gateway);
 359                         char * link_name;
 360                         unsigned int i;
 361                         xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 362                         for(i=xbt_dynar_length(route->generic_route.link_list) ;i>0 ;i--)
 363                         {
 364                                 link_name = xbt_dynar_get_as(route->generic_route.link_list,i-1,void *);
 365                                 void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 366                                 xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 367                                 xbt_dynar_push(link_route_to_test,&link);
 368                         }
 369                         xbt_assert(!xbt_dynar_compare(
 370                                   (void*)TO_FLOYD_LINK(*dst_id, *src_id)->generic_route.link_list,
 371                               (void*)link_route_to_test,
 372                                   (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 373                                   "The route between \"%s\" and \"%s\" already exists", src,dst);
 374                 }
 375                 else
 376                 {
 377                         if(route->dst_gateway && route->src_gateway)
 378                         {
 379                           char *gw_src = xbt_strdup(route->src_gateway);
 380                           char *gw_dst = xbt_strdup(route->dst_gateway);
 381                           route->src_gateway = gw_dst;
 382                           route->dst_gateway = gw_src;
 383                         }
 384
 385                         if(!route->dst_gateway && !route->src_gateway)
 386                           XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dst, src);
 387                         else
 388                           XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 389                                          route->src_gateway, src, route->dst_gateway);
 390
 391                     TO_FLOYD_LINK(*dst_id, *src_id) =
 392                                 generic_new_extended_route(rc->hierarchy, route, 0);
 393                     TO_FLOYD_PRED(*dst_id, *src_id) = *dst_id;
 394                     TO_FLOYD_COST(*dst_id, *src_id) =
 395                                 ((TO_FLOYD_LINK(*dst_id, *src_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 396                 }
 397         }
 398 }