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Date:   Wed, 11 Dec 2019 14:45:54 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Jens Axboe <axboe@...nel.dk>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Steve French <smfrench@...il.com>
Cc:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: iwlwifi warnings in 5.5-rc1

++ others who reported this

On Tue, 2019-12-10 at 13:46 -0700, Jens Axboe wrote:

> ------------[ cut here ]------------
> STA b4:75:0e:99:1f:e0 AC 2 txq pending airtime underflow: 4294967088, 208

We think this is due to TSO, the change below will disable the AQL again
for now until we can figure out how to really fix it. I think I'll do
the equivalent for 5.5 and maybe leave it enabled only for ath10k, or
something like that ...

johannes


diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 6cca0853f183..4c2b5ba3ac09 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -672,9 +672,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 			IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H;
 	}
 
-	local->airtime_flags = AIRTIME_USE_TX |
-			       AIRTIME_USE_RX |
-			       AIRTIME_USE_AQL;
+	local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX;
 	local->aql_threshold = IEEE80211_AQL_THRESHOLD;
 	atomic_set(&local->aql_total_pending_airtime, 0);
 
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 8eafd81e97b4..a14d0dac52e8 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1916,6 +1916,9 @@ void ieee80211_sta_update_pending_airtime(struct ieee80211_local *local,
 {
 	int tx_pending;
 
+	if (!(local->airtime_flags & AIRTIME_USE_AQL))
+		return;
+
 	if (!tx_completed) {
 		if (sta)
 			atomic_add(tx_airtime,


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