mac80211: fix A-MSDU tx aggregation (FS#174)

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/patches/324-mac80211-fix-A-MSDU-aggregation-with-fast-xmit-txq.patch

@@ -0,0 +1,34 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 4 Nov 2016 10:18:51 +0100
+Subject: [PATCH] mac80211: fix A-MSDU aggregation with fast-xmit + txq
+
+A-MSDU aggregation alters the QoS header after a frame has been
+enqueued, so it needs to be ready before enqueue and not overwritten
+again afterwards
+
+Fixes: bb42f2d13ffc ("mac80211: Move reorder-sensitive TX handlers to after TXQ dequeue")
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -3245,7 +3245,6 @@ static void ieee80211_xmit_fast_finish(s
+ 
+ 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
+ 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+-		*ieee80211_get_qos_ctl(hdr) = tid;
+ 		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
+ 	} else {
+ 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
+@@ -3370,6 +3369,11 @@ static bool ieee80211_xmit_fast(struct i
+ 		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
+ 	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
+ 
++	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
++		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
++		*ieee80211_get_qos_ctl(hdr) = tid;
++	}
++
+ 	__skb_queue_head_init(&tx.skbs);
+ 
+ 	tx.flags = IEEE80211_TX_UNICAST;