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