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Date:   Wed, 11 Dec 2019 15:09:58 +0100
From:   Toke Høiland-Jørgensen <>
To:     Johannes Berg <>,
        Jens Axboe <>,
        Emmanuel Grumbach <>,
        Luca Coelho <>,
        "Jason A. Donenfeld" <>,
        Steve French <>
Cc:     "linux-wireless\" <>,
        Networking <>
Subject: Re: iwlwifi warnings in 5.5-rc1

Johannes Berg <> writes:

> ++ 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 ...

If we're doing this on a per-driver basis, let's make it a proper
NL80211_EXT_FEATURE and expose it to userspace; that way users can at
least discover if it's supported on their device. I can send a patch
adding that...

Maybe we should untangle this from airtime_flags completely, since if we
just use the flags people could conceivably end up disabling it by
mistake, couldn't they?


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