diff options
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2800lib.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c index 028715730b2c..7f040b0eac36 100644 --- a/drivers/net/wireless/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/rt2x00/rt2800lib.c @@ -634,9 +634,11 @@ static bool rt2800_txdone_entry_check(struct queue_entry *entry, u32 reg) void rt2800_txdone_entry(struct queue_entry *entry, u32 status) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; + struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); struct txdone_entry_desc txdesc; u32 word; u16 mcs, real_mcs; + int aggr, ampdu; __le32 *txwi; /* @@ -645,8 +647,33 @@ void rt2800_txdone_entry(struct queue_entry *entry, u32 status) txdesc.flags = 0; txwi = rt2800_drv_get_txwi(entry); rt2x00_desc_read(txwi, 0, &word); + mcs = rt2x00_get_field32(word, TXWI_W0_MCS); + ampdu = rt2x00_get_field32(word, TXWI_W0_AMPDU); + real_mcs = rt2x00_get_field32(status, TX_STA_FIFO_MCS); + aggr = rt2x00_get_field32(status, TX_STA_FIFO_TX_AGGRE); + + /* + * If a frame was meant to be sent as a single non-aggregated MPDU + * but ended up in an aggregate the used tx rate doesn't correlate + * with the one specified in the TXWI as the whole aggregate is sent + * with the same rate. + * + * For example: two frames are sent to rt2x00, the first one sets + * AMPDU=1 and requests MCS7 whereas the second frame sets AMDPU=0 + * and requests MCS15. If the hw aggregates both frames into one + * AMDPU the tx status for both frames will contain MCS7 although + * the frame was sent successfully. + * + * Hence, replace the requested rate with the real tx rate to not + * confuse the rate control algortihm by providing clearly wrong + * data. + */ + if (aggr == 1 && ampdu == 0 && real_mcs != mcs) { + skbdesc->tx_rate_idx = real_mcs; + mcs = real_mcs; + } /* * Ralink has a retry mechanism using a global fallback |