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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net
Subject: [PATCH 6/8] mac80211: minstrel_ht: improve sample rate selection
Date:   Tue, 29 Dec 2020 17:01:23 +0100
Message-Id: <20201229160125.92794-6-nbd@nbd.name>
In-Reply-To: <20201229160125.92794-1-nbd@nbd.name>
References: <20201229160125.92794-1-nbd@nbd.name>
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Always allow sampling of rates faster than the primary max throughput rate.
When the second max_tp_rate is higher than the first one, sample attempts were
previously skipped, potentially causing rate control to get stuck at a slightly
lower rate

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/rc80211_minstrel_ht.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 950e6d2b4525..dcc4394a872a 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1379,13 +1379,13 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	mrs = &mg->rates[sample_idx];
 	sample_idx += sample_group * MCS_GROUP_RATES;
 
-	/* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */
+	tp_rate1 = mi->max_tp_rate[0];
+
+	/* Set tp_rate2 to the second highest max_tp_rate */
 	if (minstrel_get_duration(mi->max_tp_rate[0]) >
 	    minstrel_get_duration(mi->max_tp_rate[1])) {
-		tp_rate1 = mi->max_tp_rate[1];
 		tp_rate2 = mi->max_tp_rate[0];
 	} else {
-		tp_rate1 = mi->max_tp_rate[0];
 		tp_rate2 = mi->max_tp_rate[1];
 	}
 
-- 
2.28.0