netdev - Re: [PATCH 1/2] wcn36xx: Pass used skb to ieee80211_tx

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Message-ID: <87fugkrchl.fsf@kamboji.qca.qualcomm.com>
Date:   Thu, 4 May 2017 13:13:43 +0000
From:   Kalle Valo <kvalo@....qualcomm.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Johannes Berg <johannes@...solutions.net>,
        "k.eugene.e@...il.com" <k.eugene.e@...il.com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "wcn36xx@...ts.infradead.org" <wcn36xx@...ts.infradead.org>,
        "nicolas.dechesne@...aro.org" <nicolas.dechesne@...aro.org>
Subject: Re: [PATCH 1/2] wcn36xx: Pass used skb to ieee80211_tx_status()

Bjorn Andersson <bjorn.andersson@...aro.org> writes:

> On Thu 27 Apr 01:22 PDT 2017, Johannes Berg wrote:
>
>> 
>> > @@ -371,7 +371,7 @@ static void reap_tx_dxes(struct wcn36xx *wcn,
>> > struct wcn36xx_dxe_ch *ch)
>> >  			info = IEEE80211_SKB_CB(ctl->skb);
>> >  			if (!(info->flags &
>> > IEEE80211_TX_CTL_REQ_TX_STATUS)) {
>> >  				/* Keep frame until TX status comes
>> > */
>> > -				ieee80211_free_txskb(wcn->hw, ctl-
>> > >skb);
>> > +				ieee80211_tx_status(wcn->hw, ctl-
>> > >skb);
>> > 
>> 
>> I don't think this is a good idea.
>
> Thanks for letting me know :)
>
>> This code intentionally checked if TX status was requested, and if not
>> then it doesn't go to the effort of building it.
>> 
>
> What I'm finding puzzling is the fact that the only caller of
> ieee80211_led_tx() is ieee80211_tx_status() and it seems like drivers,
> such as ath10k, call this for each packet handled - but I'm likely
> missing something.
>
>> As it is with your patch, it'll go and report the TX status without any
>> TX status information - which is handled in wcn36xx_dxe_tx_ack_ind()
>> for those frames needing it.
>> 
>
> Right, it doesn't sound desired. However, during normal operation I'm
> not seeing IEEE80211_TX_CTL_REQ_TX_STATUS being set and as such
> ieee80211_led_tx() is never called.

So what's the conclusion? How do we get leds working?

-- 
Kalle Valo