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_extended_t *link_table;
  26 } s_as_floyd_t, *as_floyd_t;
  27
  28 static route_extended_t floyd_get_route(AS_t asg,
  29                                         const char *src, const char *dst);
  30
  31 /* Business methods */
  32 static xbt_dynar_t floyd_get_onelink_routes(AS_t asg)
  33 {
  34   xbt_dynar_t ret = xbt_dynar_new(sizeof(onelink_t), xbt_free);
  35
  36   xbt_dict_cursor_t c1 = NULL, c2 = NULL;
  37   char *k1, *d1, *k2, *d2;
  38   xbt_dict_foreach(asg->to_index, c1, k1, d1) {
  39     xbt_dict_foreach(asg->to_index, c2, k2, d2) {
  40       route_extended_t route = floyd_get_route(asg, k1, k2);
  41       if (route) {
  42         if (xbt_dynar_length(route->generic_route.link_list) == 1) {
  43           void *link =
  44               *(void **) xbt_dynar_get_ptr(route->generic_route.link_list,
  45                                            0);
  46           onelink_t onelink = xbt_new0(s_onelink_t, 1);
  47           onelink->link_ptr = link;
  48           if (asg->hierarchy == SURF_ROUTING_BASE) {
  49             onelink->src = xbt_strdup(k1);
  50             onelink->dst = xbt_strdup(k2);
  51           } else if (asg->hierarchy == SURF_ROUTING_RECURSIVE) {
  52             onelink->src = xbt_strdup(route->src_gateway);
  53             onelink->dst = xbt_strdup(route->dst_gateway);
  54           }
  55           xbt_dynar_push(ret, &onelink);
  56         }
  57       }
  58     }
  59   }
  60   return ret;
  61 }
  62
  63 static route_extended_t floyd_get_route(AS_t asg,
  64                                         const char *src, const char *dst)
  65 {
  66   xbt_assert(asg && src
  67               && dst,
  68               "Invalid params for \"get_route\" function at AS \"%s\"",
  69               asg->name);
  70
  71   /* set utils vars */
  72   as_floyd_t as = (as_floyd_t)asg;
  73   size_t table_size = xbt_dict_length(asg->to_index);
  74
  75   generic_src_dst_check(asg, src, dst);
  76   int *src_id = xbt_dict_get_or_null(asg->to_index, src);
  77   int *dst_id = xbt_dict_get_or_null(asg->to_index, dst);
  78   xbt_assert(src_id
  79               && dst_id,
  80               "Ask for route \"from\"(%s)  or \"to\"(%s) no found in the local table",
  81               src, dst);
  82
  83   /* create a result route */
  84   route_extended_t new_e_route = xbt_new0(s_route_extended_t, 1);
  85   new_e_route->generic_route.link_list =
  86       xbt_dynar_new(global_routing->size_of_link, NULL);
  87   new_e_route->src_gateway = NULL;
  88   new_e_route->dst_gateway = NULL;
  89
  90   int first = 1;
  91   int pred = *dst_id;
  92   int prev_pred = 0;
  93   char *gw_src = NULL, *gw_dst = NULL, *prev_gw_src, *first_gw = NULL;
  94   unsigned int cpt;
  95   void *link;
  96   xbt_dynar_t links;
  97
  98   do {
  99     prev_pred = pred;
 100     pred = TO_FLOYD_PRED(*src_id, pred);
 101     if (pred == -1)             /* if no pred in route -> no route to host */
 102       break;
 103     xbt_assert(TO_FLOYD_LINK(pred, prev_pred),
 104                 "Invalid link for the route between \"%s\" or \"%s\"", src,
 105                 dst);
 106
 107     prev_gw_src = gw_src;
 108
 109     route_extended_t e_route = TO_FLOYD_LINK(pred, prev_pred);
 110     gw_src = e_route->src_gateway;
 111     gw_dst = e_route->dst_gateway;
 112
 113     if (first)
 114       first_gw = gw_dst;
 115
 116     if (asg->hierarchy == SURF_ROUTING_RECURSIVE && !first
 117         && strcmp(gw_dst, prev_gw_src)) {
 118       xbt_dynar_t e_route_as_to_as =
 119           routing_get_route(gw_dst, prev_gw_src);
 120       xbt_assert(e_route_as_to_as, "no route between \"%s\" and \"%s\"",
 121                   gw_dst, prev_gw_src);
 122       links = e_route_as_to_as;
 123       int pos = 0;
 124       xbt_dynar_foreach(links, cpt, link) {
 125         xbt_dynar_insert_at(new_e_route->generic_route.link_list, pos,
 126                             &link);
 127         pos++;
 128       }
 129     }
 130
 131     links = e_route->generic_route.link_list;
 132     xbt_dynar_foreach(links, cpt, link) {
 133       xbt_dynar_unshift(new_e_route->generic_route.link_list, &link);
 134     }
 135     first = 0;
 136
 137   } while (pred != *src_id);
 138   xbt_assert(pred != -1, "no route from host %d to %d (\"%s\" to \"%s\")",
 139               *src_id, *dst_id, src, dst);
 140
 141   if (asg->hierarchy == SURF_ROUTING_RECURSIVE) {
 142     new_e_route->src_gateway = xbt_strdup(gw_src);
 143     new_e_route->dst_gateway = xbt_strdup(first_gw);
 144   }
 145
 146   return new_e_route;
 147 }
 148
 149 static void floyd_finalize(AS_t rc)
 150 {
 151   as_floyd_t as = (as_floyd_t) rc;
 152   int i, j;
 153   size_t table_size;
 154   if (as) {
 155     table_size = xbt_dict_length(as->generic_routing.to_index);
 156     /* Delete link_table */
 157     for (i = 0; i < table_size; i++)
 158       for (j = 0; j < table_size; j++)
 159         generic_free_extended_route(TO_FLOYD_LINK(i, j));
 160     xbt_free(as->link_table);
 161     /* Delete bypass dict */
 162     xbt_dict_free(&as->generic_routing.bypassRoutes);
 163     /* Delete index dict */
 164     xbt_dict_free(&(as->generic_routing.to_index));
 165     /* Delete dictionary index dict, predecessor and links table */
 166     xbt_free(as->predecessor_table);
 167     /* Delete structure */
 168     xbt_free(rc);
 169   }
 170 }
 171
 172 AS_t model_floyd_create(void)
 173 {
 174   as_floyd_t new_component = (as_floyd_t)routmod_generic_create(sizeof(s_as_floyd_t));
 175   new_component->generic_routing.parse_route = model_floyd_parse_route;
 176   new_component->generic_routing.parse_ASroute = model_floyd_parse_route;
 177   new_component->generic_routing.get_route = floyd_get_route;
 178   new_component->generic_routing.get_onelink_routes =
 179       floyd_get_onelink_routes;
 180   new_component->generic_routing.finalize = floyd_finalize;
 181   return (AS_t)new_component;
 182 }
 183
 184 void model_floyd_end(AS_t current_routing)
 185 {
 186
 187         as_floyd_t as =
 188           ((as_floyd_t) current_routing);
 189
 190         unsigned int i, j, a, b, c;
 191
 192         /* set the size of table routing */
 193         size_t table_size = xbt_dict_length(as->generic_routing.to_index);
 194
 195         if(!as->link_table)
 196         {
 197                 /* Create Cost, Predecessor and Link tables */
 198                 as->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 199                 as->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 200                 as->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 201
 202                 /* Initialize costs and predecessors */
 203                 for (i = 0; i < table_size; i++)
 204                 for (j = 0; j < table_size; j++) {
 205                   TO_FLOYD_COST(i, j) = DBL_MAX;
 206                   TO_FLOYD_PRED(i, j) = -1;
 207                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 208                 }
 209         }
 210
 211         /* Add the loopback if needed */
 212         if (current_routing->hierarchy == SURF_ROUTING_BASE) {
 213                 for (i = 0; i < table_size; i++) {
 214                   route_extended_t e_route = TO_FLOYD_LINK(i, i);
 215                   if (!e_route) {
 216                         e_route = xbt_new0(s_route_extended_t, 1);
 217                         e_route->src_gateway = NULL;
 218                         e_route->dst_gateway = NULL;
 219                         e_route->generic_route.link_list =
 220                                 xbt_dynar_new(global_routing->size_of_link, NULL);
 221                         xbt_dynar_push(e_route->generic_route.link_list,
 222                                                    &global_routing->loopback);
 223                         TO_FLOYD_LINK(i, i) = e_route;
 224                         TO_FLOYD_PRED(i, i) = i;
 225                         TO_FLOYD_COST(i, i) = 1;
 226                   }
 227                 }
 228         }
 229         /* Calculate path costs */
 230         for (c = 0; c < table_size; c++) {
 231                 for (a = 0; a < table_size; a++) {
 232                   for (b = 0; b < table_size; b++) {
 233                         if (TO_FLOYD_COST(a, c) < DBL_MAX && TO_FLOYD_COST(c, b) < DBL_MAX) {
 234                           if (TO_FLOYD_COST(a, b) == DBL_MAX ||
 235                                   (TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b) <
 236                                    TO_FLOYD_COST(a, b))) {
 237                                 TO_FLOYD_COST(a, b) =
 238                                         TO_FLOYD_COST(a, c) + TO_FLOYD_COST(c, b);
 239                                 TO_FLOYD_PRED(a, b) = TO_FLOYD_PRED(c, b);
 240                           }
 241                         }
 242                   }
 243                 }
 244         }
 245 }
 246
 247 static int surf_pointer_resource_cmp(const void *a, const void *b) {
 248   return a != b;
 249 }
 250
 251 //FIXME: kill dupplicates in next function with full routing
 252
 253 void model_floyd_parse_route(AS_t rc, const char *src,
 254         const char *dst, route_extended_t route)
 255 {
 256         as_floyd_t as = (as_floyd_t) rc;
 257
 258         /* set the size of table routing */
 259         size_t table_size = xbt_dict_length(rc->to_index);
 260         int *src_id, *dst_id;
 261         int i,j;
 262
 263         src_id = xbt_dict_get_or_null(rc->to_index, src);
 264         dst_id = xbt_dict_get_or_null(rc->to_index, dst);
 265
 266         xbt_assert(src_id, "Network elements %s not found", src);
 267         xbt_assert(dst_id, "Network elements %s not found", dst);
 268
 269         if(!as->link_table)
 270         {
 271                 /* Create Cost, Predecessor and Link tables */
 272                 as->cost_table = xbt_new0(double, table_size * table_size);       /* link cost from host to host */
 273                 as->predecessor_table = xbt_new0(int, table_size * table_size);  /* predecessor host numbers */
 274                 as->link_table = xbt_new0(route_extended_t, table_size * table_size);    /* actual link between src and dst */
 275
 276                 /* Initialize costs and predecessors */
 277                 for (i = 0; i < table_size; i++)
 278                 for (j = 0; j < table_size; j++) {
 279                   TO_FLOYD_COST(i, j) = DBL_MAX;
 280                   TO_FLOYD_PRED(i, j) = -1;
 281                   TO_FLOYD_LINK(i, j) = NULL;       /* fixed, missing in the previous version */
 282                 }
 283         }
 284
 285         if(TO_FLOYD_LINK(*src_id, *dst_id))
 286         {
 287                 if(!route->dst_gateway && !route->src_gateway)
 288                         XBT_DEBUG("See Route from \"%s\" to \"%s\"", src, dst);
 289                 else
 290                         XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 291                                  route->src_gateway, dst, route->dst_gateway);
 292                 char * link_name;
 293                 unsigned int cpt;
 294                 xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 295                 xbt_dynar_foreach(route->generic_route.link_list,cpt,link_name)
 296                 {
 297                         void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 298                         xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 299                         xbt_dynar_push(link_route_to_test,&link);
 300                 }
 301                 xbt_assert(!xbt_dynar_compare(
 302                           (void*)TO_FLOYD_LINK(*src_id, *dst_id)->generic_route.link_list,
 303                           (void*)link_route_to_test,
 304                           (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 305                           "The route between \"%s\" and \"%s\" already exists", src,dst);
 306         }
 307         else
 308         {
 309                 if(!route->dst_gateway && !route->src_gateway)
 310                   XBT_DEBUG("Load Route from \"%s\" to \"%s\"", src, dst);
 311                 else{
 312                         XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
 313                                  route->src_gateway, dst, route->dst_gateway);
 314                         if(routing_get_network_element_type((const char*)route->dst_gateway) == SURF_NETWORK_ELEMENT_NULL)
 315                                 xbt_die("The dst_gateway '%s' does not exist!",route->dst_gateway);
 316                         if(routing_get_network_element_type((const char*)route->src_gateway) == SURF_NETWORK_ELEMENT_NULL)
 317                                 xbt_die("The src_gateway '%s' does not exist!",route->src_gateway);
 318                 }
 319             TO_FLOYD_LINK(*src_id, *dst_id) =
 320                         generic_new_extended_route(rc->hierarchy, route, 1);
 321             TO_FLOYD_PRED(*src_id, *dst_id) = *src_id;
 322             TO_FLOYD_COST(*src_id, *dst_id) =
 323                         ((TO_FLOYD_LINK(*src_id, *dst_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 324         }
 325
 326         if( A_surfxml_route_symmetrical == A_surfxml_route_symmetrical_YES
 327                 || A_surfxml_ASroute_symmetrical == A_surfxml_ASroute_symmetrical_YES )
 328         {
 329                 if(TO_FLOYD_LINK(*dst_id, *src_id))
 330                 {
 331                         if(!route->dst_gateway && !route->src_gateway)
 332                           XBT_DEBUG("See Route from \"%s\" to \"%s\"", dst, src);
 333                         else
 334                           XBT_DEBUG("See ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 335                                          route->src_gateway, src, route->dst_gateway);
 336                         char * link_name;
 337                         unsigned int i;
 338                         xbt_dynar_t link_route_to_test = xbt_dynar_new(global_routing->size_of_link, NULL);
 339                         for(i=xbt_dynar_length(route->generic_route.link_list) ;i>0 ;i--)
 340                         {
 341                                 link_name = xbt_dynar_get_as(route->generic_route.link_list,i-1,void *);
 342                                 void *link = xbt_lib_get_or_null(link_lib, link_name, SURF_LINK_LEVEL);
 343                                 xbt_assert(link,"Link : '%s' doesn't exists.",link_name);
 344                                 xbt_dynar_push(link_route_to_test,&link);
 345                         }
 346                         xbt_assert(!xbt_dynar_compare(
 347                                   (void*)TO_FLOYD_LINK(*dst_id, *src_id)->generic_route.link_list,
 348                               (void*)link_route_to_test,
 349                                   (int_f_cpvoid_cpvoid_t) surf_pointer_resource_cmp),
 350                                   "The route between \"%s\" and \"%s\" already exists", src,dst);
 351                 }
 352                 else
 353                 {
 354                         if(route->dst_gateway && route->src_gateway)
 355                         {
 356                           char *gw_src = xbt_strdup(route->src_gateway);
 357                           char *gw_dst = xbt_strdup(route->dst_gateway);
 358                           route->src_gateway = gw_dst;
 359                           route->dst_gateway = gw_src;
 360                         }
 361
 362                         if(!route->dst_gateway && !route->src_gateway)
 363                           XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dst, src);
 364                         else
 365                           XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", dst,
 366                                          route->src_gateway, src, route->dst_gateway);
 367
 368                     TO_FLOYD_LINK(*dst_id, *src_id) =
 369                                 generic_new_extended_route(rc->hierarchy, route, 0);
 370                     TO_FLOYD_PRED(*dst_id, *src_id) = *dst_id;
 371                     TO_FLOYD_COST(*dst_id, *src_id) =
 372                                 ((TO_FLOYD_LINK(*dst_id, *src_id))->generic_route.link_list)->used;   /* count of links, old model assume 1 */
 373                 }
 374         }
 375 }