mac80211: improve performance a bit

SVN-Revision: 20145

package/mac80211/patches/580-tx_status_optimization.patch

@@ -0,0 +1,48 @@
+--- a/net/mac80211/status.c
++++ b/net/mac80211/status.c
+@@ -171,7 +171,7 @@ void ieee80211_tx_status(struct ieee8021
+ 	struct net_device *prev_dev = NULL;
+ 	struct sta_info *sta, *tmp;
+ 	int retry_count = -1, i;
+-	bool injected;
++	bool send_to_cooked;
+ 
+ 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+ 		/* the HW cannot have attempted that rate */
+@@ -296,11 +296,15 @@ void ieee80211_tx_status(struct ieee8021
+ 	/* this was a transmitted frame, but now we want to reuse it */
+ 	skb_orphan(skb);
+ 
++	/* Need to make a copy before skb->cb gets cleared */
++	send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
++			(type != IEEE80211_FTYPE_DATA);
++
+ 	/*
+ 	 * This is a bit racy but we can avoid a lot of work
+ 	 * with this test...
+ 	 */
+-	if (!local->monitors && !local->cooked_mntrs) {
++	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
+ 		dev_kfree_skb(skb);
+ 		return;
+ 	}
+@@ -345,9 +349,6 @@ void ieee80211_tx_status(struct ieee8021
+ 	/* for now report the total retry_count */
+ 	rthdr->data_retries = retry_count;
+ 
+-	/* Need to make a copy before skb->cb gets cleared */
+-	injected = !!(info->flags & IEEE80211_TX_CTL_INJECTED);
+-
+ 	/* XXX: is this sufficient for BPF? */
+ 	skb_set_mac_header(skb, 0);
+ 	skb->ip_summed = CHECKSUM_UNNECESSARY;
+@@ -362,8 +363,7 @@ void ieee80211_tx_status(struct ieee8021
+ 				continue;
+ 
+ 			if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
+-			    !injected &&
+-			    (type == IEEE80211_FTYPE_DATA))
++			    !send_to_cooked)
+ 				continue;
+ 
+ 			if (prev_dev) {