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authorSander Vrijders <sander.vrijders@ugent.be>2017-09-25 15:31:20 +0200
committerSander Vrijders <sander.vrijders@ugent.be>2017-09-25 15:55:47 +0200
commit0847da715c82d49b01758d88ecca496eba2c8d34 (patch)
tree4b1ed345508bcadf31716db93b03169afdc909c8 /src/ipcpd/normal/pol
parent3074adc1615517150568d396d629175932a08a52 (diff)
downloadouroboros-0847da715c82d49b01758d88ecca496eba2c8d34.tar.gz
ouroboros-0847da715c82d49b01758d88ecca496eba2c8d34.zip
ipcpd: normal: Keep index in vertex struct
This keeps the index in the vertex struct so that is more easily available during Dijkstra.
Diffstat (limited to 'src/ipcpd/normal/pol')
-rw-r--r--src/ipcpd/normal/pol/graph.c49
-rw-r--r--src/ipcpd/normal/pol/link_state.c2
2 files changed, 24 insertions, 27 deletions
diff --git a/src/ipcpd/normal/pol/graph.c b/src/ipcpd/normal/pol/graph.c
index 1a6ad2b3..27c5cfca 100644
--- a/src/ipcpd/normal/pol/graph.c
+++ b/src/ipcpd/normal/pol/graph.c
@@ -46,6 +46,7 @@ struct vertex {
struct list_head next;
uint64_t addr;
struct list_head edges;
+ int index;
};
struct graph {
@@ -110,6 +111,7 @@ static struct vertex * add_vertex(struct graph * graph,
{
struct vertex * vertex;
struct list_head * p;
+ int i = 0;
vertex = malloc(sizeof(*vertex));
if (vertex == NULL)
@@ -124,10 +126,20 @@ static struct vertex * add_vertex(struct graph * graph,
struct vertex * v = list_entry(p, struct vertex, next);
if (v->addr > addr)
break;
+ i++;
}
+ vertex->index = i;
+
list_add_tail(&vertex->next, p);
+ /* Increase the index of the vertices to the right. */
+ list_for_each(p, &graph->vertices) {
+ struct vertex * v = list_entry(p, struct vertex, next);
+ if (v->addr > addr)
+ v->index++;
+ }
+
graph->nr_vertices++;
return vertex;
@@ -141,6 +153,13 @@ static void del_vertex(struct graph * graph,
list_del(&vertex->next);
+ /* Decrease the index of the vertices to the right. */
+ list_for_each(p, &graph->vertices) {
+ struct vertex * v = list_entry(p, struct vertex, next);
+ if (v->addr > vertex->addr)
+ v->index--;
+ }
+
list_for_each_safe(p, n, &vertex->edges) {
struct edge * e = list_entry(p, struct edge, next);
del_edge(e);
@@ -353,23 +372,6 @@ static int get_min_vertex(struct graph * graph,
return index;
}
-static int get_vertex_number(struct graph * graph,
- struct vertex * v)
-
-{
- int i = 0;
- struct list_head * p = NULL;
-
- list_for_each(p, &graph->vertices) {
- struct vertex * vertex = list_entry(p, struct vertex, next);
- if (vertex == v)
- return i;
- i++;
- }
-
- return -1;
-}
-
static struct vertex ** dijkstra(struct graph * graph,
uint64_t src)
{
@@ -377,7 +379,6 @@ static struct vertex ** dijkstra(struct graph * graph,
bool used[graph->nr_vertices];
struct list_head * p = NULL;
int i = 0;
- int j = 0;
struct vertex * v = NULL;
struct edge * e = NULL;
int alt;
@@ -406,22 +407,18 @@ static struct vertex ** dijkstra(struct graph * graph,
list_for_each(p, &v->edges) {
e = list_entry(p, struct edge, next);
- j = get_vertex_number(graph, e->nb);
- if (j == -1)
- continue;
-
/*
* NOTE: Current weight is just hop count.
* Method could be extended to use a different
* weight for a different QoS cube.
*/
alt = dist[i] + 1;
- if (alt < dist[j]) {
- dist[j] = alt;
+ if (alt < dist[e->nb->index]) {
+ dist[e->nb->index] = alt;
if (v->addr == src)
- nhop[j] = e->nb;
+ nhop[e->nb->index] = e->nb;
else
- nhop[j] = nhop[i];
+ nhop[e->nb->index] = nhop[i];
}
}
i = get_min_vertex(graph, dist, used, &v);
diff --git a/src/ipcpd/normal/pol/link_state.c b/src/ipcpd/normal/pol/link_state.c
index ca837cc1..d45dae15 100644
--- a/src/ipcpd/normal/pol/link_state.c
+++ b/src/ipcpd/normal/pol/link_state.c
@@ -379,7 +379,7 @@ static int nbr_to_fd(uint64_t addr)
static void * calculate_pff(void * o)
{
struct routing_i * instance;
- int i;
+ int i = 0;
int fd;
struct list_head table;
struct list_head * p;