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authorFelix Fietkau <nbd@nbd.name>2022-04-12 09:32:34 +0200
committerFelix Fietkau <nbd@nbd.name>2022-04-12 09:34:07 +0200
commit968c1dedc22517a2a79a1fe0ce884aaeaca32d7a (patch)
treea4a2afbb3db54207876c93b7a29ebfd08d8d830a /package/kernel/mac80211/patches/subsys
parent724a9bb3ea46c7373c9f1232ec617b22c341ef94 (diff)
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mac80211: backport minstrel_ht fix for legacy rates
Fixes OFDM rates on 5 GHz Signed-off-by: Felix Fietkau <nbd@nbd.name> (cherry-picked from commit 5d5afd51772c9a992cb6bb9e0a9dce6feaa3fdef)
Diffstat (limited to 'package/kernel/mac80211/patches/subsys')
-rw-r--r--package/kernel/mac80211/patches/subsys/329-mac80211-minstrel_ht-fix-where-rate-stats-are-stored.patch61
1 files changed, 61 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/329-mac80211-minstrel_ht-fix-where-rate-stats-are-stored.patch b/package/kernel/mac80211/patches/subsys/329-mac80211-minstrel_ht-fix-where-rate-stats-are-stored.patch
new file mode 100644
index 0000000000..d7832acce5
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/329-mac80211-minstrel_ht-fix-where-rate-stats-are-stored.patch
@@ -0,0 +1,61 @@
+From: Peter Seiderer <ps.report@gmx.net>
+Date: Mon, 4 Apr 2022 18:54:14 +0200
+Subject: [PATCH] mac80211: minstrel_ht: fix where rate stats are stored (fixes
+ debugfs output)
+
+Using an ath9k card the debugfs output of minstrel_ht looks like the following
+(note the zero values for the first four rates sum-of success/attempts):
+
+ best ____________rate__________ ____statistics___ _____last____ ______sum-of________
+mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]
+OFDM 1 DP 6.0M 272 1640 5.2 3.1 53.8 3 0 0 0 0
+OFDM 1 C 9.0M 273 1104 7.7 4.6 53.8 4 0 0 0 0
+OFDM 1 B 12.0M 274 836 10.0 6.0 53.8 4 0 0 0 0
+OFDM 1 A S 18.0M 275 568 14.3 8.5 53.8 5 0 0 0 0
+OFDM 1 S 24.0M 276 436 18.1 0.0 0.0 5 0 1 80 1778
+OFDM 1 36.0M 277 300 24.9 0.0 0.0 0 0 1 0 107
+OFDM 1 S 48.0M 278 236 30.4 0.0 0.0 0 0 0 0 75
+OFDM 1 54.0M 279 212 33.0 0.0 0.0 0 0 0 0 72
+
+Total packet count:: ideal 16582 lookaround 885
+Average # of aggregated frames per A-MPDU: 1.0
+
+Debugging showed that the rate statistics for the first four rates where
+stored in the MINSTREL_CCK_GROUP instead of the MINSTREL_OFDM_GROUP because
+in minstrel_ht_get_stats() the supported check was not honoured as done in
+various other places, e.g net/mac80211/rc80211_minstrel_ht_debugfs.c:
+
+ 74 if (!(mi->supported[i] & BIT(j)))
+ 75 continue;
+
+With the patch applied the output looks good:
+
+ best ____________rate__________ ____statistics___ _____last____ ______sum-of________
+mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]
+OFDM 1 D 6.0M 272 1640 5.2 5.2 100.0 3 0 0 1 1
+OFDM 1 C 9.0M 273 1104 7.7 7.7 100.0 4 0 0 38 38
+OFDM 1 B 12.0M 274 836 10.0 9.9 89.5 4 2 2 372 395
+OFDM 1 A P 18.0M 275 568 14.3 14.3 97.2 5 52 53 6956 7181
+OFDM 1 S 24.0M 276 436 18.1 0.0 0.0 0 0 1 6 163
+OFDM 1 36.0M 277 300 24.9 0.0 0.0 0 0 1 0 35
+OFDM 1 S 48.0M 278 236 30.4 0.0 0.0 0 0 0 0 38
+OFDM 1 S 54.0M 279 212 33.0 0.0 0.0 0 0 0 0 38
+
+Total packet count:: ideal 7097 lookaround 287
+Average # of aggregated frames per A-MPDU: 1.0
+
+Signed-off-by: Peter Seiderer <ps.report@gmx.net>
+---
+
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -364,6 +364,9 @@ minstrel_ht_get_stats(struct minstrel_pr
+
+ group = MINSTREL_CCK_GROUP;
+ for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) {
++ if (!(mi->supported[group] & BIT(idx)))
++ continue;
++
+ if (rate->idx != mp->cck_rates[idx])
+ continue;
+