[ath9k-devel] [PATCH 05/13] ath9k_htc: add rx header converter to make it usable by ath9k

[Felix Fietkau <nbd@openwrt.org>]

On 2014-02-03 12:22, Oleksij Rempel wrote:
> Am 03.02.2014 03:09, schrieb Sujith Manoharan:
>> Oleksij Rempel wrote:
>>> +	rx_stats = kzalloc(sizeof(struct ath_rx_status), GFP_KERNEL);
>>> +	if (unlikely(rx_stats == NULL)) {
>>> +		ath_err(common, "rx_stats allocation filed!\n");
>>> +		goto err_nofree;
>>> +	}
>>> +	rx_status_htc_to_ath(rx_stats, &rxbuf->rxstatus);
>>> +
> 
>> This seems a little expensive, since this would happen for every packet,
>> and a memcpy is already done earlier, for storing the RX status in
>> rxbuf->rxstatus. Instead of using 'struct ath_htc_rx_status' in
>> 'struct ath9k_htc_rxbuf', why can't 'struct ath_rx_status' be used ?
>> The values can be converted and stored directly, avoiding this alloc.
> 
> Do you mean kzalloc or converter?
> then memcpy is removed by patch 12/13. Converter is not effective but it
> should prevent from confusions. At least until FW use same flags and
> struct ath_rx_status do.
> But i'm open for other ideas too.
You should at least keep rx_stats on stack instead of using kzalloc,
that would make it much faster.

- Felix