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