batman-adv: add bat_neigh_is_equiv_or_better API function
Each routing protocol has its own metric semantic and
therefore is the protocol itself the only component able to
compare two metrics to check their "similarity".
This new API allows each routing protocol to implement its
own logic and make the external code protocol agnostic.
Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index b288d90..4376fe75 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1494,6 +1494,23 @@
return tq1 - tq2;
}
+/**
+ * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
+ * neigh2 from the metric prospective
+ * @neigh1: the first neighbor object of the comparison
+ * @neigh2: the second neighbor object of the comparison
+ *
+ * Returns true if the metric via neigh1 is equally good or better than the
+ * metric via neigh2, false otherwise.
+ */
+static bool batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
+ struct batadv_neigh_node *neigh2)
+{
+ int diff = batadv_iv_ogm_neigh_cmp(neigh1, neigh2);
+
+ return diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
+}
+
static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
.name = "BATMAN_IV",
.bat_iface_enable = batadv_iv_ogm_iface_enable,
@@ -1503,6 +1520,7 @@
.bat_ogm_schedule = batadv_iv_ogm_schedule,
.bat_ogm_emit = batadv_iv_ogm_emit,
.bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
+ .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
.bat_orig_print = batadv_iv_ogm_orig_print,
};