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 = NULL, *prev_gw_src, *first_gw = NULL;
  99   unsigned int cpt;
 100   void *link;
 101   xbt_dynar_t links;
 102
 103   do {
 104     prev_pred = pred;
 105     pred = TO_FLOYD_PRED(*src_id, pred);
 106     if (pred == -1)             /* if no pred in route -> no route to host */
 107       break;
 108     xbt_assert(TO_FLOYD_LINK(pred, prev_pred),
 109                 "Invalid link for the route between \"%s\" or \"%s\"", src,
 110                 dst);
 111
 112     prev_gw_src = gw_src;
 113
 114     route_extended_t e_route = TO_FLOYD_LINK(pred, prev_pred);
 115     gw_src = e_route->src_gateway;
 116     gw_dst = e_route->dst_gateway;
 117
 118     if (first)
 119       first_gw = gw_dst;
 120
 121     if (rc->hierarchy == SURF_ROUTING_RECURSIVE && !first
 122         && strcmp(gw_dst, prev_gw_src)) {
 123       xbt_dynar_t e_route_as_to_as =
 124           (*(global_routing->get_route)) (gw_dst, prev_gw_src);
 125       xbt_assert(e_route_as_to_as, "no route between \"%s\" and \"%s\"",
 126                   gw_dst, prev_gw_src);
 127       links = e_route_as_to_as;
 128       int pos = 0;
 129       xbt_dynar_foreach(links, cpt, link) {
 130         xbt_dynar_insert_at(new_e_route->generic_route.link_list, pos,
 131                             &link);
 132         pos++;
 133       }
 134     }
 135
 136     links = e_route->generic_route.link_list;
 137     xbt_dynar_foreach(links, cpt, link) {
 138       xbt_dynar_unshift(new_e_route->generic_route.link_list, &link);
 139     }
 140     first = 0;
 141
 142   } while (pred != *src_id);
 143   xbt_assert(pred != -1, "no route from host %d to %d (\"%s\" to \"%s\")",
 144               *src_id, *dst_id, src, dst);
 145
 146   if (rc->hierarchy == SURF_ROUTING_RECURSIVE) {
 147     new_e_route->src_gateway = xbt_strdup(gw_src);
 148     new_e_route->dst_gateway = xbt_strdup(first_gw);
 149   }
 150
 151   return new_e_route;
 152 }
 153
 154 static void floyd_finalize(routing_component_t rc)
 155 {
 156   routing_component_floyd_t routing = (routing_component_floyd_t) rc;
 157   int i, j;
 158   size_t table_size;
 159   if (routing) {
 160     table_size = xbt_dict_length(routing->generic_routing.to_index);
 161     /* Delete link_table */
 162     for (i = 0; i < table_size; i++)
 163       for (j = 0; j < table_size; j++)
 164         generic_free_extended_route(TO_FLOYD_LINK(i, j));
 165     xbt_free(routing->link_table);
 166     /* Delete bypass dict */
 167     xbt_dict_free(&routing->generic_routing.bypassRoutes);
 168     /* Delete index dict */
 169     xbt_dict_free(&(routing->generic_routing.to_index));
 170     /* Delete dictionary index dict, predecessor and links table */
 171     xbt_free(routing->predecessor_table);
 172     /* Delete structure */
 173     xbt_free(rc);
 174   }
 175 }
 176
 177 void *model_floyd_create(void)
 178 {
 179   routing_component_floyd_t new_component =
 180       xbt_new0(s_routing_component_floyd_t, 1);
 181   new_component->generic_routing.set_processing_unit =
 182       generic_set_processing_unit;
 183   new_component->generic_routing.set_autonomous_system =
 184       generic_set_autonomous_system;
 185   new_component->generic_routing.set_route = model_floyd_set_route;
 186   new_component->generic_routing.set_ASroute = model_floyd_set_route;
 187   new_component->generic_routing.set_bypassroute = generic_set_bypassroute;
 188   new_component->generic_routing.get_route = floyd_get_route;
 189   new_component->generic_routing.get_latency = generic_get_link_latency;
 190   new_component->generic_routing.get_onelink_routes =
 191       floyd_get_onelink_routes;
 192   new_component->generic_routing.get_bypass_route =
 193       generic_get_bypassroute;
 194   new_component->generic_routing.finalize = floyd_finalize;
 195   new_component->generic_routing.to_index = xbt_dict_new();
 196   new_component->generic_routing.bypassRoutes = xbt_dict_new();
 197   new_component->generic_routing.get_network_element_type = get_network_element_type;
 198   return new_component;
 199 }
 200
 201 void model_floyd_load(void)
 202 {
 203   /* use "surfxml_add_callback" to add a parse function call */
 204 }
 205
 206 void model_floyd_unload(void)
 207 {
 208   /* use "surfxml_del_callback" to remove a parse function call */
 209 }
 210
 211 void model_floyd_end(void)
 212 {
 213
 214         routing_component_floyd_t routing =
 215           ((routing_component_floyd_t) current_routing);
 216
 217         unsigned int i, j, a, b, c;
 218
 219         /* set the size of table routing */
 220         size_t table_size = xbt_dict_length(routing->generic_routing.to_index);
 221
 222         if(!routing->link_table)
 223         {
 224                 /* Create Cost, Predecessor and Link tables */
 225                 routing->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 226                 routing->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 227                 routing->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 228
 229                 /* Initialize costs and predecessors */
 230                 for (i = 0; i < table_size; i++)
 231                 for (j = 0; j < table_size; j++) {
 232                   TO_FLOYD_COST(i, j) = DBL_MAX;
 233                   TO_FLOYD_PRED(i, j) = -1;
 234                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 235                 }
 236         }
 237
 238         /* Add the loopback if needed */
 239         if (current_routing->hierarchy == SURF_ROUTING_BASE) {
 240                 for (i = 0; i < table_size; i++) {
 241                   route_extended_t e_route = TO_FLOYD_LINK(i, i);
 242                   if (!e_route) {
 243                         e_route = xbt_new0(s_route_extended_t, 1);
 244                         e_route->src_gateway = NULL;
 245                         e_route->dst_gateway = NULL;
 246                         e_route->generic_route.link_list =
 247                                 xbt_dynar_new(global_routing->size_of_link, NULL);
 248                         xbt_dynar_push(e_route->generic_route.link_list,
 249                                                    &global_routing->loopback);
 250                         TO_FLOYD_LINK(i, i) = e_route;
 251                         TO_FLOYD_PRED(i, i) = i;
 252                         TO_FLOYD_COST(i, i) = 1;
 253                   }
 254                 }
 255         }
 256         /* Calculate path costs */
 257         for (c = 0; c < table_size; c++) {
 258                 for (a = 0; a < table_size; a++) {
 259                   for (b = 0; b < table_size; b++) {
 260                         if (TO_FLOYD_COST(a, c) < DBL_MAX && TO_FLOYD_COST(c, b) < DBL_MAX) {
 261                           if (TO_FLOYD_COST(a, b) == DBL_MAX ||
 262                                   (TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b) <
 263                                    TO_FLOYD_COST(a, b))) {
 264                                 TO_FLOYD_COST(a, b) =
 265                                         TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b);
 266                                 TO_FLOYD_PRED(a, b) = TO_FLOYD_PRED(c, b);
 267                           }
 268                         }
 269                   }
 270                 }
 271         }
 272 }
 273
 274 void model_floyd_set_route(routing_component_t rc, const char *src,
 275         const char *dst, name_route_extended_t route)
 276 {
 277         routing_component_floyd_t routing = (routing_component_floyd_t) rc;
 278
 279         /* set the size of table routing */
 280         size_t table_size = xbt_dict_length(rc->to_index);
 281         int *src_id, *dst_id;
 282         int i,j;
 283
 284         src_id = xbt_dict_get_or_null(rc->to_index, src);
 285         dst_id = xbt_dict_get_or_null(rc->to_index, dst);
 286
 287         xbt_assert(src_id, "Network elements %s not found", src);
 288         xbt_assert(dst_id, "Network elements %s not found", dst);
 289
 290         if(!routing->link_table)
 291         {
 292                 /* Create Cost, Predecessor and Link tables */
 293                 routing->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 294                 routing->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 295                 routing->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 296
 297                 /* Initialize costs and predecessors */
 298                 for (i = 0; i < table_size; i++)
 299                 for (j = 0; j < table_size; j++) {
 300                   TO_FLOYD_COST(i, j) = DBL_MAX;
 301                   TO_FLOYD_PRED(i, j) = -1;
 302                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 303                 }
 304         }
 305
 306         if(TO_FLOYD_LINK(*src_id, *dst_id))
 307         {
 308                 if(!route->dst_gateway && !route->src_gateway)
 309                         XBT_DEBUG("See Route from \"%s\" to \"%s\"", src, dst);
 310                 else
 311                         XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 312                                  route->src_gateway, dst, route->dst_gateway);
 313                 char * link_name;
 314                 unsigned int cpt;
 315                 xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 316                 xbt_dynar_foreach(route->generic_route.link_list,cpt,link_name)
 317                 {
 318                         void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 319                         xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 320                         xbt_dynar_push(link_route_to_test,&link);
 321                 }
 322                 xbt_assert(!xbt_dynar_compare(
 323                           (void*)TO_FLOYD_LINK(*src_id, *dst_id)->generic_route.link_list,
 324                           (void*)link_route_to_test,
 325                           (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 326                           "The route between \"%s\" and \"%s\" already exists", src,dst);
 327         }
 328         else
 329         {
 330                 if(!route->dst_gateway && !route->src_gateway)
 331                   XBT_DEBUG("Load Route from \"%s\" to \"%s\"", src, dst);
 332                 else{
 333                         XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 334                                  route->src_gateway, dst, route->dst_gateway);
 335                         if(global_routing->get_network_element_type((const char*)route->dst_gateway) == SURF_NETWORK_ELEMENT_NULL)
 336                                 xbt_die("The dst_gateway '%s' does not exist!",route->dst_gateway);
 337                         if(global_routing->get_network_element_type((const char*)route->src_gateway) == SURF_NETWORK_ELEMENT_NULL)
 338                                 xbt_die("The src_gateway '%s' does not exist!",route->src_gateway);
 339                 }
 340             TO_FLOYD_LINK(*src_id, *dst_id) =
 341                         generic_new_extended_route(rc->hierarchy, route, 1);
 342             TO_FLOYD_PRED(*src_id, *dst_id) = *src_id;
 343             TO_FLOYD_COST(*src_id, *dst_id) =
 344                         ((TO_FLOYD_LINK(*src_id, *dst_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 345         }
 346
 347         if( A_surfxml_route_symmetrical == A_surfxml_route_symmetrical_YES
 348                 || A_surfxml_ASroute_symmetrical == A_surfxml_ASroute_symmetrical_YES )
 349         {
 350                 if(TO_FLOYD_LINK(*dst_id, *src_id))
 351                 {
 352                         if(!route->dst_gateway && !route->src_gateway)
 353                           XBT_DEBUG("See Route from \"%s\" to \"%s\"", dst, src);
 354                         else
 355                           XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 356                                          route->src_gateway, src, route->dst_gateway);
 357                         char * link_name;
 358                         unsigned int i;
 359                         xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 360                         for(i=xbt_dynar_length(route->generic_route.link_list) ;i>0 ;i--)
 361                         {
 362                                 link_name = xbt_dynar_get_as(route->generic_route.link_list,i-1,void *);
 363                                 void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 364                                 xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 365                                 xbt_dynar_push(link_route_to_test,&link);
 366                         }
 367                         xbt_assert(!xbt_dynar_compare(
 368                                   (void*)TO_FLOYD_LINK(*dst_id, *src_id)->generic_route.link_list,
 369                               (void*)link_route_to_test,
 370                                   (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 371                                   "The route between \"%s\" and \"%s\" already exists", src,dst);
 372                 }
 373                 else
 374                 {
 375                         if(route->dst_gateway && route->src_gateway)
 376                         {
 377                           char *gw_src = xbt_strdup(route->src_gateway);
 378                           char *gw_dst = xbt_strdup(route->dst_gateway);
 379                           route->src_gateway = gw_dst;
 380                           route->dst_gateway = gw_src;
 381                         }
 382
 383                         if(!route->dst_gateway && !route->src_gateway)
 384                           XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dst, src);
 385                         else
 386                           XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 387                                          route->src_gateway, src, route->dst_gateway);
 388
 389                     TO_FLOYD_LINK(*dst_id, *src_id) =
 390                                 generic_new_extended_route(rc->hierarchy, route, 0);
 391                     TO_FLOYD_PRED(*dst_id, *src_id) = *dst_id;
 392                     TO_FLOYD_COST(*dst_id, *src_id) =
 393                                 ((TO_FLOYD_LINK(*dst_id, *src_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 394                 }
 395         }
 396 }