mac80211/minstrel_ht: improve max_prob_rate selection
max_prob_rate should be selected to be very reliable, however limiting
it to single-stream on 3-stream devices is a bit much.
Allow max_prob_rate to use one stream less than the max_tp_rate.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 0b5cdd9..6c735e0 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -246,6 +246,7 @@
struct minstrel_rate_stats *mr;
int cur_prob, cur_prob_tp, cur_tp, cur_tp2;
int group, i, index;
+ int prob_max_streams = 1;
if (mi->ampdu_packets > 0) {
mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
@@ -323,20 +324,13 @@
if (!mg->supported)
continue;
- mr = minstrel_get_ratestats(mi, mg->max_prob_rate);
- if (cur_prob_tp < mr->cur_tp &&
- minstrel_mcs_groups[group].streams == 1) {
- mi->max_prob_rate = mg->max_prob_rate;
- cur_prob = mr->cur_prob;
- cur_prob_tp = mr->cur_tp;
- }
-
mr = minstrel_get_ratestats(mi, mg->max_tp_rate);
if (cur_tp < mr->cur_tp) {
mi->max_tp_rate2 = mi->max_tp_rate;
cur_tp2 = cur_tp;
mi->max_tp_rate = mg->max_tp_rate;
cur_tp = mr->cur_tp;
+ prob_max_streams = minstrel_mcs_groups[group].streams - 1;
}
mr = minstrel_get_ratestats(mi, mg->max_tp_rate2);
@@ -346,6 +340,23 @@
}
}
+ if (prob_max_streams < 1)
+ prob_max_streams = 1;
+
+ for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
+ mg = &mi->groups[group];
+ if (!mg->supported)
+ continue;
+ mr = minstrel_get_ratestats(mi, mg->max_prob_rate);
+ if (cur_prob_tp < mr->cur_tp &&
+ minstrel_mcs_groups[group].streams <= prob_max_streams) {
+ mi->max_prob_rate = mg->max_prob_rate;
+ cur_prob = mr->cur_prob;
+ cur_prob_tp = mr->cur_tp;
+ }
+ }
+
+
mi->stats_update = jiffies;
}