ipcpd: Recalculate PFF upon adding new neighbor

This recalculates the PFF upon adding a new neighbor, so that the
network reconverges faster. It is safe to do so since it is only done
by the two IPCPs that established the new flow. The PFF is also
recalculated every 4 seconds.

Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>
Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>

1 files changed, 42 insertions, 31 deletions

diff --git a/src/ipcpd/normal/pol/link_state.c b/src/ipcpd/normal/pol/link_state.c
index cfe4faff..91c18a9d 100644
--- a/src/ipcpd/normal/pol/link_state.c
+++ b/src/ipcpd/normal/pol/link_state.c
@@ -459,50 +459,49 @@ static int nbr_to_fd(uint64_t addr)
         return -1;
 }
 
-static void * calculate_pff(void * o)
+static void calculate_pff(struct routing_i * instance)
 {
-        struct routing_i * instance;
         int                fd;
         struct list_head   table;
         struct list_head * p;
         struct list_head * q;
         int                fds[PROG_MAX_FLOWS];
 
-        instance = (struct routing_i *) o;
+        if (ls.rtable(ls.graph, ipcpi.dt_addr, &table))
+                return;
 
-        while (true) {
-                if (ls.rtable(ls.graph, ipcpi.dt_addr, &table)) {
-                        sleep(RECALC_TIME);
-                        continue;
-                }
-
-                pff_lock(instance->pff);
-
-                pff_flush(instance->pff);
+        pff_lock(instance->pff);
 
-                list_for_each(p, &table) {
-                        int                    i = 0;
-                        struct routing_table * t =
-                                list_entry(p, struct routing_table, next);
+        pff_flush(instance->pff);
 
-                        list_for_each(q, &t->nhops) {
-                                struct nhop * n =
-                                        list_entry(q, struct nhop, next);
+        /* Calulcate forwarding table from routing table. */
+        list_for_each(p, &table) {
+                int                    i = 0;
+                struct routing_table * t =
+                        list_entry(p, struct routing_table, next);
 
-                                fd = nbr_to_fd(n->nhop);
-                                if (fd == -1)
-                                        continue;
+                list_for_each(q, &t->nhops) {
+                        struct nhop * n = list_entry(q, struct nhop, next);
 
-                                fds[i++] = fd;
-                        }
+                        fd = nbr_to_fd(n->nhop);
+                        if (fd == -1)
+                                continue;
 
-                        pff_add(instance->pff, t->dst, fds, i);
+                        fds[i++] = fd;
                 }
 
-                pff_unlock(instance->pff);
+                pff_add(instance->pff, t->dst, fds, i);
+        }
 
-                graph_free_routing_table(ls.graph, &table);
+        pff_unlock(instance->pff);
 
+        graph_free_routing_table(ls.graph, &table);
+}
+
+static void * periodic_recalc_pff(void * o)
+{
+        while (true) {
+                calculate_pff((struct routing_i *) o);
                 sleep(RECALC_TIME);
         }
 
@@ -723,9 +722,10 @@ static void handle_event(void *       self,
                          const void * o)
 {
         /* FIXME: Apply correct QoS on graph */
-        struct conn * c;
-        qosspec_t     qs;
-        int           flags;
+        struct conn *      c;
+        qosspec_t          qs;
+        int                flags;
+        struct list_head * p;
 
         (void) self;
 
@@ -740,7 +740,17 @@ static void handle_event(void *       self,
 
                 if (lsdb_add_link(ipcpi.dt_addr, c->conn_info.addr, &qs))
                         log_dbg("Failed to add adjacency to LSDB.");
+
                 send_lsm(ipcpi.dt_addr, c->conn_info.addr);
+
+                pthread_mutex_lock(&ls.routing_i_lock);
+                list_for_each(p, &ls.routing_instances) {
+                        struct routing_i * instance =
+                                list_entry(p, struct routing_i, next);
+                        calculate_pff(instance);
+                }
+                pthread_mutex_unlock(&ls.routing_i_lock);
+
                 break;
         case NOTIFY_DT_CONN_DEL:
                 flow_event(c->flow_info.fd, false);
@@ -792,7 +802,8 @@ struct routing_i * link_state_routing_i_create(struct pff * pff)
 
         tmp->pff = pff;
 
-        if (pthread_create(&tmp->calculator, NULL, calculate_pff, tmp)) {
+        if (pthread_create(&tmp->calculator, NULL,
+                           periodic_recalc_pff, tmp)) {
                 free(tmp);
                 return NULL;
         }