[PATCH 1/9] ath10k: speedup htt rx descriptor processing for tx completion

[Valo, Kalle]

"Manoharan, Rajkumar" <rmanohar at qti.qualcomm.com> writes:

>>> @@ -1712,7 +1710,20 @@ static void ath10k_htt_rx_frm_tx_compl(struct ath10k *ar,
>>>       for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
>>>               msdu_id = resp->data_tx_completion.msdus[i];
>>>               tx_done.msdu_id = __le16_to_cpu(msdu_id);
>>> -             ath10k_txrx_tx_unref(htt, &tx_done);
>>> +
>>> +             /* kfifo_put: In practice firmware shouldn't fire off per-CE
>>> +              * interrupt and main interrupt (MSI/-X range case) for the same
>>> +              * HTC service so it should be safe to use kfifo_put w/o lock.
>>> +              *
>>> +              * From kfifo_put() documentation:
>>> +              *  Note that with only one concurrent reader and one concurrent
>>> +              *  writer, you don't need extra locking to use these macro.
>>> +              */
>>> +             if (!kfifo_put(&htt->txdone_fifo, tx_done)) {
>>> +                     ath10k_warn(ar, "txdone fifo overrun, msdu_id %d status %d\n",
>>> +                                 tx_done.msdu_id, tx_done.status);
>>> +                     ath10k_txrx_tx_unref(htt, &tx_done);
>>> +             }
>>
>> I see two new warnings on the kfifo_put() call:
>>
>> drivers/net/wireless/ath/ath10k/htt_rx.c:1722:22: warning: cast to non-scalar
>> drivers/net/wireless/ath/ath10k/htt_rx.c:1722:22: warning: cast from non-scalar
>> 
>> But I suspect they are false warnings due to my old compiler:
>> 
>> gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
>> 
>> Opinions?
>> 
> Hmm... I am not sure why older compiler is not complaining this. Unfortunately
> both x86 and cross compiler are not throwing any warnings though :(
>
> gcc version 5.3.0 (GCC)
> Target: x86_64-unknown-linux-gnu
>
> gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r47724)
> Target: arm-openwrt-linux-uclibcgnueabi

Maybe we can just ignore the warning and hope that all recent compilers
are smart enough.

-- 
Kalle Valo