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mac80211: don't apply flow control on management frames

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In some cases (depending on the driver, but it's true e.g. for
iwlwifi) we're using an internal TXQ for management packets,
mostly to simplify the code and to have a place to queue them.
However, it appears that in certain cases we can confuse the
code and management frames are dropped, which is certainly not
what we want.

Short-circuit the processing of management frames. To keep the
impact minimal, only put them on the frags queue and check the
tid == management only for doing that and to skip the airtime
fairness checks, if applicable.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20210319232800.0e876c800866.Id2b66eb5a17f3869b776c39b5ca713272ea09d5d@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2021-03-19 23:28:01 +01:00
parent 272cd0e8d4
commit 73bc9e0af5
1 changed files with 15 additions and 3 deletions
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18
net/mac80211/tx.c
View file

@ -5,7 +5,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2018-2020 Intel Corporation
* Copyright (C) 2018-2021 Intel Corporation
*
* Transmit and frame generation functions.
*/
@ -1388,8 +1388,17 @@ static void ieee80211_txq_enqueue(struct ieee80211_local *local,
ieee80211_set_skb_enqueue_time(skb);
spin_lock_bh(&fq->lock);
fq_tin_enqueue(fq, tin, flow_idx, skb,
fq_skb_free_func);
/*
* For management frames, don't really apply codel etc.,
* we don't want to apply any shaping or anything we just
* want to simplify the driver API by having them on the
* txqi.
*/
if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS))
__skb_queue_tail(&txqi->frags, skb);
else
fq_tin_enqueue(fq, tin, flow_idx, skb,
fq_skb_free_func);
spin_unlock_bh(&fq->lock);
}
@ -3835,6 +3844,9 @@ bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
if (!txq->sta)
return true;
if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
return true;
sta = container_of(txq->sta, struct sta_info, sta);
if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
sta->airtime[txq->ac].aql_limit_low)