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authorThomas Huehn <thomas@net.t-labs.tu-berlin.de>2013-03-05 02:30:02 +0400
committerJohannes Berg <johannes.berg@intel.com>2013-03-06 19:36:07 +0400
commitc8ca8c2f933a516b5f4586d7dc6055b72107f246 (patch)
tree87a1285588a6dcec2926e804e52fdc4d9bf8fba6
parenta512d4b543ea20ec84f712f90a5229ab88a9709c (diff)
downloadlinux-c8ca8c2f933a516b5f4586d7dc6055b72107f246.tar.xz
mac80211: merge value scaling macros of minstrel_ht and minstrel
Both minstrel versions use individual ways to scale up integer values to perform calculations. Merge minstrel_ht's scaling macros into minstrels header file and use them in both minstrel versions. Acked-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--net/mac80211/rc80211_minstrel.c9
-rw-r--r--net/mac80211/rc80211_minstrel.h5
-rw-r--r--net/mac80211/rc80211_minstrel_debugfs.c6
-rw-r--r--net/mac80211/rc80211_minstrel_ht.h5
4 files changed, 12 insertions, 13 deletions
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index d78f629179c7..c9b990237991 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -86,10 +86,8 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
if (!usecs)
usecs = 1000000;
- /* To avoid rounding issues, probabilities scale from 0 (0%)
- * to 18000 (100%) */
if (mr->attempts) {
- mr->cur_prob = (mr->success * 18000) / mr->attempts;
+ mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts);
mr->succ_hist += mr->success;
mr->att_hist += mr->attempts;
mr->probability = minstrel_ewma(mr->probability,
@@ -105,7 +103,8 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
/* Sample less often below the 10% chance of success.
* Sample less often above the 95% chance of success. */
- if ((mr->probability > 17100) || (mr->probability < 1800)) {
+ if (mr->probability > MINSTREL_FRAC(95, 100) ||
+ mr->probability < MINSTREL_FRAC(10, 100)) {
mr->adjusted_retry_count = mr->retry_count >> 1;
if (mr->adjusted_retry_count > 2)
mr->adjusted_retry_count = 2;
@@ -300,7 +299,7 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
/* If we're not using MRR and the sampling rate already
* has a probability of >95%, we shouldn't be attempting
* to use it, as this only wastes precious airtime */
- if (!mrr && sample && (mi->r[ndx].probability > 17100))
+ if (!mrr && sample && (mi->r[ndx].probability > MINSTREL_FRAC(95, 100)))
ndx = mi->max_tp_rate;
ar[0].idx = mi->r[ndx].rix;
diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 98db93f96add..fda4a6154c87 100644
--- a/net/mac80211/rc80211_minstrel.h
+++ b/net/mac80211/rc80211_minstrel.h
@@ -11,6 +11,11 @@
#define EWMA_LEVEL 75 /* ewma weighting factor [%] */
+/* scaled fraction values */
+#define MINSTREL_SCALE 16
+#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
+#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
+
/*
* Perform EWMA (Exponentially Weighted Moving Average) calculation
*/
diff --git a/net/mac80211/rc80211_minstrel_debugfs.c b/net/mac80211/rc80211_minstrel_debugfs.c
index d5a56226e675..c0ebfaca6ba0 100644
--- a/net/mac80211/rc80211_minstrel_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_debugfs.c
@@ -79,9 +79,9 @@ minstrel_stats_open(struct inode *inode, struct file *file)
p += sprintf(p, "%3u%s", mr->bitrate / 2,
(mr->bitrate & 1 ? ".5" : " "));
- tp = mr->cur_tp / ((18000 << 10) / 96);
- prob = mr->cur_prob / 18;
- eprob = mr->probability / 18;
+ tp = MINSTREL_TRUNC(mr->cur_tp / 10);
+ prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
+ eprob = MINSTREL_TRUNC(mr->probability * 1000);
p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
"%3u(%3u) %8llu %8llu\n",
diff --git a/net/mac80211/rc80211_minstrel_ht.h b/net/mac80211/rc80211_minstrel_ht.h
index c6d6a0dc46fc..9b16e9de9923 100644
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -16,11 +16,6 @@
#define MINSTREL_MAX_STREAMS 3
#define MINSTREL_STREAM_GROUPS 4
-/* scaled fraction values */
-#define MINSTREL_SCALE 16
-#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
-#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
-
#define MCS_GROUP_RATES 8
struct mcs_group {