From b3e73f3a953a91571930ffa75ef613b5f5d17707 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 3 Mar 2013 12:05:33 +0000
Subject: mac80211: merge some more minstrel_ht performance improvements

SVN-Revision: 35848
---
 package/mac80211/patches/300-pending_work.patch | 77 ++++++++++++++++++++-----
 1 file changed, 61 insertions(+), 16 deletions(-)

diff --git a/package/mac80211/patches/300-pending_work.patch b/package/mac80211/patches/300-pending_work.patch
index a1bb7023e9..560c3f2662 100644
--- a/package/mac80211/patches/300-pending_work.patch
+++ b/package/mac80211/patches/300-pending_work.patch
@@ -678,15 +678,7 @@
  }
  
  /*
-@@ -243,6 +246,7 @@ minstrel_ht_update_stats(struct minstrel
- 	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,
-@@ -308,8 +312,8 @@ minstrel_ht_update_stats(struct minstrel
+@@ -308,8 +311,8 @@ minstrel_ht_update_stats(struct minstrel
  		}
  	}
  
@@ -697,7 +689,7 @@
  
  	cur_prob = 0;
  	cur_prob_tp = 0;
-@@ -320,20 +324,13 @@ minstrel_ht_update_stats(struct minstrel
+@@ -320,20 +323,13 @@ minstrel_ht_update_stats(struct minstrel
  		if (!mg->supported)
  			continue;
  
@@ -715,16 +707,16 @@
  			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;
++			mi->max_prob_streams = minstrel_mcs_groups[group].streams - 1;
  		}
  
  		mr = minstrel_get_ratestats(mi, mg->max_tp_rate2);
-@@ -343,6 +340,23 @@ minstrel_ht_update_stats(struct minstrel
+@@ -343,6 +339,23 @@ minstrel_ht_update_stats(struct minstrel
  		}
  	}
  
-+	if (prob_max_streams < 1)
-+		prob_max_streams = 1;
++	if (mi->max_prob_streams < 1)
++		mi->max_prob_streams = 1;
 +
 +	for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
 +		mg = &mi->groups[group];
@@ -732,7 +724,7 @@
 +			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) {
++		    minstrel_mcs_groups[group].streams <= mi->max_prob_streams) {
 +			mi->max_prob_rate = mg->max_prob_rate;
 +			cur_prob = mr->cur_prob;
 +			cur_prob_tp = mr->cur_tp;
@@ -743,7 +735,7 @@
  	mi->stats_update = jiffies;
  }
  
-@@ -536,7 +550,7 @@ minstrel_calc_retransmit(struct minstrel
+@@ -536,7 +549,7 @@ minstrel_calc_retransmit(struct minstrel
  	mr->retry_updated = true;
  
  	group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
@@ -752,3 +744,56 @@
  
  	/* Contention time for first 2 tries */
  	ctime = (t_slot * cw) >> 1;
+@@ -616,6 +629,7 @@ minstrel_get_sample_rate(struct minstrel
+ {
+ 	struct minstrel_rate_stats *mr;
+ 	struct minstrel_mcs_group_data *mg;
++	unsigned int sample_dur, sample_group;
+ 	int sample_idx = 0;
+ 
+ 	if (mi->sample_wait > 0) {
+@@ -626,11 +640,11 @@ minstrel_get_sample_rate(struct minstrel
+ 	if (!mi->sample_tries)
+ 		return -1;
+ 
+-	mi->sample_tries--;
+ 	mg = &mi->groups[mi->sample_group];
+ 	sample_idx = sample_table[mg->column][mg->index];
+ 	mr = &mg->rates[sample_idx];
+-	sample_idx += mi->sample_group * MCS_GROUP_RATES;
++	sample_group = mi->sample_group;
++	sample_idx += sample_group * MCS_GROUP_RATES;
+ 	minstrel_next_sample_idx(mi);
+ 
+ 	/*
+@@ -651,14 +665,18 @@ minstrel_get_sample_rate(struct minstrel
+ 	 * Make sure that lower rates get sampled only occasionally,
+ 	 * if the link is working perfectly.
+ 	 */
+-	if (minstrel_get_duration(sample_idx) >
+-	    minstrel_get_duration(mi->max_tp_rate)) {
++	sample_dur = minstrel_get_duration(sample_idx);
++	if (sample_dur >= minstrel_get_duration(mi->max_tp_rate2) &&
++	    (mi->max_prob_streams <
++	     minstrel_mcs_groups[sample_group].streams ||
++	     sample_dur >= minstrel_get_duration(mi->max_prob_rate))) {
+ 		if (mr->sample_skipped < 20)
+ 			return -1;
+ 
+ 		if (mi->sample_slow++ > 2)
+ 			return -1;
+ 	}
++	mi->sample_tries--;
+ 
+ 	return sample_idx;
+ }
+--- a/net/mac80211/rc80211_minstrel_ht.h
++++ b/net/mac80211/rc80211_minstrel_ht.h
+@@ -85,6 +85,7 @@ struct minstrel_ht_sta {
+ 
+ 	/* best probability rate */
+ 	unsigned int max_prob_rate;
++	unsigned int max_prob_streams;
+ 
+ 	/* time of last status update */
+ 	unsigned long stats_update;
-- 
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