Commit a8d418d9 authored by Julan Hsu's avatar Julan Hsu Committed by Johannes Berg
Browse files

mac80211: mesh: only switch path when new metric is at least 10% better 



This helps to reduce frequent path switches when multiple path
candidates have the same or very similar path metrics.

Signed-off-by: default avatarJulan Hsu <julanhsu@google.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 67fc0554

net/mac80211/mesh_hwmp.c

+8 −3
Original line number Diff line number Diff line
@@ -447,7 +447,10 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, 
			    (mpath->flags & MESH_PATH_SN_VALID)) {

				if (SN_GT(mpath->sn, orig_sn) ||

				    (mpath->sn == orig_sn &&

				     new_metric >= mpath->metric)) {

				     (rcu_access_pointer(mpath->next_hop) !=

						      sta ?

					      mult_frac(new_metric, 10, 9) :

					      new_metric) >= mpath->metric)) {

					process = false;

					fresh_info = false;

				}
@@ -516,7 +519,9 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, 
			spin_lock_bh(&mpath->state_lock);

			if ((mpath->flags & MESH_PATH_FIXED) ||

			    ((mpath->flags & MESH_PATH_ACTIVE) &&

					(last_hop_metric > mpath->metric)))

			     ((rcu_access_pointer(mpath->next_hop) != sta ?

				       mult_frac(last_hop_metric, 10, 9) :

				       last_hop_metric) > mpath->metric)))

				fresh_info = false;

		} else {

			mpath = mesh_path_add(sdata, ta);