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rt2x00: Fix tx aggregation problems with some clients

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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>
This commit is contained in:
Helmut Schaa 2011-03-28 13:35:21 +02:00 committed by John W. Linville
parent b35e77cf84
commit f16d2db704
3 changed files with 9 additions and 1 deletions
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3
drivers/net/wireless/rt2x00/rt2800lib.c
View file

@ -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

6
drivers/net/wireless/rt2x00/rt2x00dev.c
View file

@ -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) {

1
drivers/net/wireless/rt2x00/rt2x00queue.h
View file

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