linux-kernel - [RFC PATCH v4 3/3] mac80211: add busy time factor into expected throughput

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Message-Id: <20220601112903.2346319-4-gasmibal@gmail.com>
Date:   Wed,  1 Jun 2022 13:29:03 +0200
From:   Baligh Gasmi <gasmibal@...il.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Baligh Gasmi <gasmibal@...il.com>
Subject: [RFC PATCH v4 3/3] mac80211: add busy time factor into expected throughput

When estimating the expected throughput, take into account the busy time
of the current channel.

Signed-off-by: Baligh Gasmi <gasmibal@...il.com>
---
 net/mac80211/sta_info.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 201aab465234..9f977cf13dd5 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2000,6 +2000,8 @@ void ieee80211_sta_update_tp(struct ieee80211_local *local,
 			     bool ack, int retry)
 {
 	unsigned long diff;
+	struct ieee80211_sub_if_data *sdata;
+	u32 avg_busy;
 	struct rate_control_ref *ref = NULL;
 
 	if (!skb || !sta || !tx_time_est)
@@ -2014,6 +2016,7 @@ void ieee80211_sta_update_tp(struct ieee80211_local *local,
 	if (local->ops->get_expected_throughput)
 		return;
 
+	sdata = sta->sdata;
 	tx_time_est += ack ? 4 : 0;
 	tx_time_est += retry ? retry * 2 : 2;
 
@@ -2022,6 +2025,10 @@ void ieee80211_sta_update_tp(struct ieee80211_local *local,
 
 	diff = jiffies - sta->deflink.status_stats.last_tp_update;
 	if (diff > HZ / 10) {
+		avg_busy = ewma_avg_busy_read(&sdata->avg_busy) >> 1;
+		sta->deflink.tx_stats.tp_tx_time_est +=
+			(sta->deflin.tx_stats.tp_tx_time_est * avg_busy) / 100;
+
 		ewma_avg_est_tp_add(&sta->deflink.status_stats.avg_est_tp,
 				    sta->deflink.tx_stats.tp_tx_size /
 				    sta->deflink.tx_stats.tp_tx_time_est);
-- 
2.36.1