From f793c7eedd94fa41e8b969b18c4907335065a376 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 20 Aug 2019 11:54:47 +0200
Subject: [PATCH] mac80211: minstrel_ht: reduce unnecessary rate probing attempts
Git-commit: f793c7eedd94fa41e8b969b18c4907335065a376
Patch-mainline: v5.4-rc1
References: jsc#SLE-13430
On hardware with static fallback tables (e.g. mt76x2), rate probing attempts
can be very expensive.
On such devices, avoid sampling rates slower than the per-group max throughput
rate, based on the assumption that the fallback table will take care of probing
lower rates within that group if the higher rates fail.
To further reduce unnecessary probing attempts, skip duplicate attempts on
rates slower than the max throughput rate.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20190820095449.45255-2-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/mac80211/rc80211_minstrel_ht.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index ba230b037257..ad5da9a71da0 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1059,6 +1059,21 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
return -1;
+
+ /*
+ * For devices with no configurable multi-rate retry, skip sampling
+ * below the per-group max throughput rate, and only use one sampling
+ * attempt per rate
+ */
+ if (mp->hw->max_rates == 1 &&
+ (minstrel_get_duration(mg->max_group_tp_rate[0]) < sample_dur ||
+ mrs->attempts))
+ return -1;
+
+ /* Skip already sampled slow rates */
+ if (sample_dur >= minstrel_get_duration(tp_rate1) && mrs->attempts)
+ return -1;
+
/*
* Make sure that lower rates get sampled only occasionally,
* if the link is working perfectly.
--
2.16.4