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| author | Julan Hsu <julanhsu@google.com> | 2019-01-15 15:33:03 -0800 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2019-01-19 09:56:22 +0100 |
| commit | a8d418d9ac25f85a9caf652a4b2d07ec790474ab (patch) | |
| tree | 7af06d1b9b6cfb7a31fea87b437bf8fcda51a6bc | |
| parent | 67fc05549cdb39f9e02ec4af5cc94509b1f89754 (diff) | |
| download | linux-a8d418d9ac25f85a9caf652a4b2d07ec790474ab.tar.gz linux-a8d418d9ac25f85a9caf652a4b2d07ec790474ab.tar.bz2 linux-a8d418d9ac25f85a9caf652a4b2d07ec790474ab.zip | |
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: Julan Hsu <julanhsu@google.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/mesh_hwmp.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index f50409635a16..e00284afdda5 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -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); |