2021-12-14 16:58:14 +00:00
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From: Felix Fietkau <nbd@nbd.name>
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Date: Tue, 14 Dec 2021 17:53:12 +0100
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Subject: [PATCH] mac80211: use coarse boottime for airtime fairness code
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The time values used by the airtime fairness code only need to be accurate
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enough to cover station activity detection.
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Using ktime_get_coarse_boottime_ns instead of ktime_get_boottime_ns will
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drop the accuracy down to jiffies intervals, but at the same time saves
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a lot of CPU cycles in a hot path
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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2021-12-20 20:55:21 +00:00
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@@ -3820,7 +3820,7 @@ struct ieee80211_txq *ieee80211_next_txq
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2021-12-14 16:58:14 +00:00
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct airtime_sched_info *air_sched;
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- u64 now = ktime_get_boottime_ns();
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+ u64 now = ktime_get_coarse_boottime_ns();
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struct ieee80211_txq *ret = NULL;
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struct airtime_info *air_info;
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struct txq_info *txqi = NULL;
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2021-12-20 20:55:21 +00:00
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@@ -3947,7 +3947,7 @@ void ieee80211_update_airtime_weight(str
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2021-12-14 16:58:14 +00:00
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u64 weight_sum = 0;
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if (unlikely(!now))
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- now = ktime_get_boottime_ns();
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+ now = ktime_get_coarse_boottime_ns();
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lockdep_assert_held(&air_sched->lock);
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2021-12-20 20:55:21 +00:00
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@@ -3973,7 +3973,7 @@ void ieee80211_schedule_txq(struct ieee8
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2021-12-14 16:58:14 +00:00
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struct ieee80211_local *local = hw_to_local(hw);
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struct txq_info *txqi = to_txq_info(txq);
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struct airtime_sched_info *air_sched;
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- u64 now = ktime_get_boottime_ns();
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+ u64 now = ktime_get_coarse_boottime_ns();
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struct airtime_info *air_info;
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u8 ac = txq->ac;
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bool was_active;
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2021-12-20 20:55:21 +00:00
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@@ -4031,7 +4031,7 @@ static void __ieee80211_unschedule_txq(s
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2021-12-14 16:58:14 +00:00
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if (!purge)
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airtime_set_active(air_sched, air_info,
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- ktime_get_boottime_ns());
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+ ktime_get_coarse_boottime_ns());
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rb_erase_cached(&txqi->schedule_order,
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&air_sched->active_txqs);
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2021-12-20 20:55:21 +00:00
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@@ -4119,7 +4119,7 @@ bool ieee80211_txq_may_transmit(struct i
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2021-12-14 16:58:14 +00:00
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if (RB_EMPTY_NODE(&txqi->schedule_order))
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goto out;
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- now = ktime_get_boottime_ns();
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+ now = ktime_get_coarse_boottime_ns();
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/* Like in ieee80211_next_txq(), make sure the first station in the
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* scheduling order is eligible for transmission to avoid starvation.
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