/* Updating the entries in the routing table based on the routes existing in configuration file*/
void net_routing_table_route_update(struct net_routing_table_t *routing_table, struct net_node_t *src_node,
struct net_node_t *dst_node, struct net_node_t *next_node, int vc_num)
{
int k;
int route_check = 0 ;
struct net_buffer_t *buffer;
struct net_link_t *link;
struct net_routing_table_entry_t *entry;
entry = net_routing_table_lookup(routing_table, src_node, dst_node);
entry->next_node = next_node;
entry->output_buffer = NULL ;
/* Look for output buffer */
buffer = NULL;
assert(list_count(src_node->output_buffer_list));
for (k = 0; (k < list_count(src_node->output_buffer_list) && route_check != 1); k++)
{
buffer = list_get(src_node->output_buffer_list, k);
link = buffer->link;
assert(link);
if ((link->dst_node == next_node))
{
if (vc_num == 0)
{
entry->output_buffer = buffer;
route_check = 1;
}
else
{
if (link->virtual_channel <= vc_num)
fatal("Network %s: %s.to.%s: wrong virtual channel number is used in route \n %s",
routing_table->net->name, src_node->name, dst_node->name, err_net_config);
struct net_buffer_t *vc_buffer;
vc_buffer = list_get(src_node->output_buffer_list, (buffer->index)+vc_num);
assert(vc_buffer->link == buffer->link);
entry->output_buffer = vc_buffer;
route_check = 1;
}
}
}
/*If there is not a route between the source node and next node , error */
if (route_check == 0) fatal("Network %s : route %s.to.%s = %s : Missing Link \n%s ",
routing_table->net->name, src_node->name, dst_node->name, next_node->name, err_net_routing);
/* Find cycle in routing table */
net_routing_table_cycle_detection(routing_table);
}
/* Calculate shortest paths Floyd-Warshall algorithm.*/
void net_routing_table_floyd_warshall(struct net_routing_table_t *routing_table)
{
int i, j, k ;
struct net_t *net = routing_table->net;
struct net_node_t *next_node;
struct net_buffer_t *buffer;
struct net_link_t *link;
struct net_routing_table_entry_t *entry;
/* The 'routing_table_entry->next_node' values do
* not necessarily point to the immediate next hop after this. */
for (k = 0; k < net->node_count; k++)
{
for (i = 0; i < net->node_count; i++)
{
for (j = 0; j < net->node_count; j++)
{
struct net_node_t *node_i;
struct net_node_t *node_j;
struct net_node_t *node_k;
struct net_routing_table_entry_t *entry_i_k;
struct net_routing_table_entry_t *entry_k_j;
struct net_routing_table_entry_t *entry_i_j;
node_i = list_get(net->node_list, i);
node_j = list_get(net->node_list, j);
node_k = list_get(net->node_list, k);
entry_i_k = net_routing_table_lookup(routing_table, node_i, node_k);
entry_k_j = net_routing_table_lookup(routing_table, node_k, node_j);
entry_i_j = net_routing_table_lookup(routing_table, node_i, node_j);
if (entry_i_k->cost + entry_k_j->cost < entry_i_j->cost)
{
entry_i_j->cost = entry_i_k->cost + entry_k_j->cost;
entry_i_j->next_node = node_k;
}
}
}
}
/* Calculate output buffers */
for (i = 0; i < net->node_count; i++)
{
for (j = 0; j < net->node_count; j++)
{
struct net_node_t *node_i;
struct net_node_t *node_j;
struct net_routing_table_entry_t *entry_i_j;
node_i = list_get(net->node_list, i);
node_j = list_get(net->node_list, j);
entry_i_j = net_routing_table_lookup(routing_table, node_i, node_j);
next_node = entry_i_j->next_node;
/* No route to node */
if (!next_node)
{
entry_i_j->output_buffer = NULL;
continue;
}
/* Follow path */
for (;;)
{
entry = net_routing_table_lookup(routing_table, node_i, next_node);
if (entry->cost <= 1)
break;
next_node = entry->next_node;
}
/* Look for output buffer */
buffer = NULL;
assert(list_count(node_i->output_buffer_list));
for (k = 0; k < list_count(node_i->output_buffer_list); k++)
{
buffer = list_get(node_i->output_buffer_list, k);
link = buffer->link;
assert(link);
if (link->dst_node == next_node)
break;
}
assert(k < list_count(node_i->output_buffer_list));
entry_i_j->output_buffer = buffer;
}
}
/* Update routing table entries to point to the next hop */
for (i = 0; i < net->node_count; i++)
{
for (j = 0; j < net->node_count; j++)
{
struct net_node_t *node_i;
struct net_node_t *node_j;
struct net_routing_table_entry_t *entry_i_j;
node_i = list_get(net->node_list, i);
node_j = list_get(net->node_list, j);
entry_i_j = net_routing_table_lookup(routing_table, node_i, node_j);
buffer = entry_i_j->output_buffer;
if (buffer)
{
link = buffer->link;
assert(link);
entry_i_j->next_node = link->dst_node;
}
}
}
/* Find cycle in routing table */
net_routing_table_cycle_detection(routing_table);
}
/* Updating the entries in the routing table based on the routes existing in
* configuration file */
void net_routing_table_route_update(struct net_routing_table_t *routing_table,
struct net_node_t *src_node, struct net_node_t *dst_node,
struct net_node_t *next_node, int vc_num)
{
int route_check = 0;
int k;
struct net_buffer_t *buffer;
struct net_link_t *link;
struct net_bus_t *bus;
struct net_routing_table_entry_t *entry;
entry = net_routing_table_lookup(routing_table, src_node, dst_node);
entry->next_node = next_node;
entry->output_buffer = NULL;
/* Look for output buffer */
buffer = NULL;
assert(list_count(src_node->output_buffer_list));
for (k = 0; (k < list_count(src_node->output_buffer_list) && route_check != 1); k++)
{
buffer = list_get(src_node->output_buffer_list, k);
if (buffer->kind == net_buffer_link)
{
link = buffer->link;
assert(link);
assert(!buffer->bus);
if ((link->dst_node == next_node))
{
if (vc_num == 0)
{
entry->output_buffer = buffer;
route_check = 1;
}
else
{
if (link->virtual_channel <= vc_num)
fatal("Network %s: %s.to.%s: wrong virtual channel "
"number is used in route \n %s",
routing_table->net->name, src_node->name,
dst_node->name, net_err_config);
struct net_buffer_t *vc_buffer;
vc_buffer = list_get(src_node->output_buffer_list, (buffer->index)+vc_num);
assert(vc_buffer->link == buffer->link);
entry->output_buffer = vc_buffer;
route_check = 1;
}
}
}
else if (buffer->kind == net_buffer_bus || buffer->kind == net_buffer_photonic)
{
assert(!buffer->link);
bus = buffer->bus;
assert(bus);
struct net_node_t * bus_node;
bus_node = bus->node;
for (int i = 0; i < list_count(bus_node->dst_buffer_list); i++)
{
struct net_buffer_t *dst_buffer;
dst_buffer = list_get(bus_node->dst_buffer_list, i);
if (dst_buffer->node == next_node)
{
entry->output_buffer = buffer;
route_check = 1;
break;
}
}
if (vc_num != 0)
fatal("Network %s: %s.to.%s: BUS does not contain virtual channel \n %s",
routing_table->net->name, src_node->name,
dst_node->name, net_err_config);
}
}
/*If there is not a route between the source node and next node , error */
if (route_check == 0) fatal("Network %s : route %s.to.%s = %s : Missing connection \n%s ",
routing_table->net->name, src_node->name, dst_node->name,
next_node->name, net_err_route_step);
/* Find cycle in routing table */
net_routing_table_cycle_detection(routing_table);
}