ath10k: improve tx throughput on slow machines

It is more efficient to move just the 802.11
header instead of the whole payload in most cases.

This has no measurable effect on modern hardware.
It should improve performance by a few percent on
hardware such as an Access Point that have a slow
CPU compared to a typical desktop CPU.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index d0a776124f1373bfd17cc37940ae26464d858de8..6e01ef6e376b4bfaeda7809839023de8e61e6c8b 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -1406,9 +1406,9 @@ static void ath10k_tx_h_qos_workaround(struct ieee80211_hw *hw,
                return;
 
        qos_ctl = ieee80211_get_qos_ctl(hdr);
-       memmove(qos_ctl, qos_ctl + IEEE80211_QOS_CTL_LEN,
-               skb->len - ieee80211_hdrlen(hdr->frame_control));
-       skb_trim(skb, skb->len - IEEE80211_QOS_CTL_LEN);
+       memmove(skb->data + IEEE80211_QOS_CTL_LEN,
+               skb->data, (void *)qos_ctl - (void *)skb->data);
+       skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 }
 
 static void ath10k_tx_h_update_wep_key(struct sk_buff *skb)