rt2x00: Fix tx aggregation problems with some clients

Some clients seem to rely upon the reception of BlockAckReqs to flush
their rx reorder buffer. In order to fix aggregation for these clients
rt2x00 should send a BlockAckReq if the transmission of an AMPDU
subframe fails.

Introduce a new flag TXDONE_AMPDU to indicate that this is an AMPDU
subframe and pass IEEE80211_TX_STAT_AMPDU_NO_BACK to mac80211 if an
AMPDU subframe failed during transmission.

This fixes aggregation problems with Intel 5100 Windows STAs (and maybe
others as well).
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -687,6 +687,9 @@ void rt2800_txdone_entry(struct queue_entry *entry, u32 status)
 		mcs = real_mcs;
 	}
 
+	if (aggr == 1 || ampdu == 1)
+		__set_bit(TXDONE_AMPDU, &txdesc.flags);
+
 	/*
 	 * Ralink has a retry mechanism using a global fallback
 	 * table. We setup this fallback table to try the immediate

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -353,10 +353,14 @@ void rt2x00lib_txdone(struct queue_entry *entry,
 	 * which would allow the rc algorithm to better decide on
 	 * which rates are suitable.
 	 */
-	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
+	if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
+	    tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 		tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 		tx_info->status.ampdu_len = 1;
 		tx_info->status.ampdu_ack_len = success ? 1 : 0;
+
+		if (!success)
+			tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 	}
 
 	if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {

drivers/net/wireless/rt2x00/rt2x00queue.h

@@ -217,6 +217,7 @@ enum txdone_entry_desc_flags {
 	TXDONE_FALLBACK,
 	TXDONE_FAILURE,
 	TXDONE_EXCESSIVE_RETRY,
+	TXDONE_AMPDU,
 };
 
 /**