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