Hi,
On Tue, Dec 22, 2015 at 5:53 AM, Souptick Joarder <[email protected]> wrote:
> On Thu, Dec 17, 2015 at 2:50 PM, Janusz Dziedzic
> <[email protected]> wrote:
>>
>> Set NEEDS_ALIGNED4_SKB hw flag.
>> This allow driver to save CPU and remove two memmove
>> from tx path.
>>
>> Signed-off-by: Janusz Dziedzic <[email protected]>
>> ---
>> drivers/net/wireless/ath/ath9k/init.c | 1 +
>> drivers/net/wireless/ath/ath9k/xmit.c | 15 ++++++++++-----
>> 2 files changed, 11 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/net/wireless/ath/ath9k/init.c
>> b/drivers/net/wireless/ath/ath9k/init.c
>> index 6abace6..d578a00 100644
>> --- a/drivers/net/wireless/ath/ath9k/init.c
>> +++ b/drivers/net/wireless/ath/ath9k/init.c
>> @@ -831,6 +831,7 @@ static void ath9k_set_hw_capab(struct ath_softc *sc,
>> struct ieee80211_hw *hw)
>> ieee80211_hw_set(hw, RX_INCLUDES_FCS);
>> ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
>> ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
>> + ieee80211_hw_set(hw, NEEDS_ALIGNED4_SKBS);
>>
>> if (ath9k_ps_enable)
>> ieee80211_hw_set(hw, SUPPORTS_PS);
>> diff --git a/drivers/net/wireless/ath/ath9k/xmit.c
>> b/drivers/net/wireless/ath/ath9k/xmit.c
>> index 82fc76f..c3bd1b1 100644
>> --- a/drivers/net/wireless/ath/ath9k/xmit.c
>> +++ b/drivers/net/wireless/ath/ath9k/xmit.c
>> @@ -2267,11 +2267,15 @@ static int ath_tx_prepare(struct ieee80211_hw *hw,
>> struct sk_buff *skb,
>> padpos = ieee80211_hdrlen(hdr->frame_control);
>> padsize = padpos & 3;
>> if (padsize && skb->len > padpos) {
>> - if (skb_headroom(skb) < padsize)
>> - return -ENOMEM;
>> + if (ieee80211_hw_check(hw, NEEDS_ALIGNED4_SKBS)) {
>> + frmlen -= padsize;
>> + } else {
>> + if (skb_headroom(skb) < padsize)
>> + return -ENOMEM;
>>
>> - skb_push(skb, padsize);
>> - memmove(skb->data, skb->data + padsize, padpos);
>
> why the same lines has been removed and added again ?
The indentation is different as they're now in another if statement
under the if (padsize... statement.
>> + skb_push(skb, padsize);
>> + memmove(skb->data, skb->data + padsize, padpos);
>> + }
>> }
>
>
>
>>
>>
>> setup_frame_info(hw, sta, skb, frmlen);
>> @@ -2494,7 +2498,8 @@ static void ath_tx_complete(struct ath_softc *sc,
>> struct sk_buff *skb,
>>
>> padpos = ieee80211_hdrlen(hdr->frame_control);
>> padsize = padpos & 3;
>> - if (padsize && skb->len>padpos+padsize) {
>> + if (padsize && skb->len > padpos + padsize &&
>> + !ieee80211_hw_check(sc->hw, NEEDS_ALIGNED4_SKBS)) {
>> /*
>> * Remove MAC header padding before giving the frame back to
>> * mac80211.
>> --
>> 1.9.1
>>
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>
> Regards
> Souptick
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--
Julian Calaby
Email: [email protected]
Profile: http://www.google.com/profiles/julian.calaby/
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