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

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

Signed-off-by: Julan Hsu <julanhsu@google.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Julan Hsu 2019-01-15 15:33:03 -08:00 committed by Johannes Berg
parent 67fc05549c
commit a8d418d9ac
1 changed files with 8 additions and 3 deletions
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11
net/mac80211/mesh_hwmp.c
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@ -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;
}
@ -515,8 +518,10 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
if (mpath) {
spin_lock_bh(&mpath->state_lock);
if ((mpath->flags & MESH_PATH_FIXED) ||
((mpath->flags & MESH_PATH_ACTIVE) &&
(last_hop_metric > mpath->metric)))
((mpath->flags & MESH_PATH_ACTIVE) &&
((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);