From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757327Ab0LHCB6 (ORCPT ); Tue, 7 Dec 2010 21:01:58 -0500 Received: from kroah.org ([198.145.64.141]:48361 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756256Ab0LHA7J (ORCPT ); Tue, 7 Dec 2010 19:59:09 -0500 X-Mailbox-Line: From gregkh@clark.site Tue Dec 7 16:57:22 2010 Message-Id: <20101208005722.793240436@clark.site> User-Agent: quilt/0.48-11.2 Date: Tue, 07 Dec 2010 16:56:31 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, =?ISO-8859-15?q?Bj=C3=B6rn=20Smedman?= , Felix Fietkau , "John W. Linville" Subject: [014/289] ath9k: A-MPDU rate control info fix In-Reply-To: <20101208005821.GA2922@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.36-stable review patch. If anyone has any objections, please let us know. ------------------ From: =?UTF-8?q?Bj=C3=B6rn=20Smedman?= commit ebd022873aa61937603d2c4dfea19ce63ea1a3c8 upstream. This patch fixes the following problems with the rate control feedback generated by ath9k for A-MPDU frames: 1. Rate control feedback is carried on the first frame of an aggregate that is either ACKed, or has execeeded the software retry count and is considered failed. However, ath9k would incorrectly assume the aggregate had the length 1 if one of these conditions did not apply to the first frame of the aggregate, but instead a later frame. This fix therefor copies the bf_nframes field of the buffer in the same manner as the rates field of the tx status. 2. Sometimes the ampdu_len and ampdu_ack_len fields of the tx status was left uninitialized eventhough the IEEE80211_TX_STAT_AMPDU flag was set. This is now avoid by setting flag and fields in the same place. 3. Even if a frame has been selected for aggregation by mac80211 and marked with the IEEE80211_TX_CTL_AMPDU flag it can sometimes happen that ath9k transmits the frame without aggregation. In these cases the ampdu_ack_len field could be incorrectly computed because the nbad parameter to ath_tx_rc_status was incorrect. Signed-off-by: Björn Smedman Acked-by: Felix Fietkau Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/ath/ath9k/xmit.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -312,6 +312,7 @@ static void ath_tx_complete_aggr(struct int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0; bool rc_update = true; struct ieee80211_tx_rate rates[4]; + int nframes; skb = bf->bf_mpdu; hdr = (struct ieee80211_hdr *)skb->data; @@ -320,6 +321,7 @@ static void ath_tx_complete_aggr(struct hw = bf->aphy->hw; memcpy(rates, tx_info->control.rates, sizeof(rates)); + nframes = bf->bf_nframes; rcu_read_lock(); @@ -337,7 +339,7 @@ static void ath_tx_complete_aggr(struct !bf->bf_stale || bf_next != NULL) list_move_tail(&bf->list, &bf_head); - ath_tx_rc_status(bf, ts, 0, 0, false); + ath_tx_rc_status(bf, ts, 1, 0, false); ath_tx_complete_buf(sc, bf, txq, &bf_head, ts, 0, 0); @@ -442,6 +444,7 @@ static void ath_tx_complete_aggr(struct if (rc_update && (acked_cnt == 1 || txfail_cnt == 1)) { memcpy(tx_info->control.rates, rates, sizeof(rates)); + bf->bf_nframes = nframes; ath_tx_rc_status(bf, ts, nbad, txok, true); rc_update = false; } else { @@ -2024,9 +2027,15 @@ static void ath_tx_rc_status(struct ath_ if (ts->ts_status & ATH9K_TXERR_FILT) tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED; - if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && update_rc) + if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && update_rc) { tx_info->flags |= IEEE80211_TX_STAT_AMPDU; + BUG_ON(nbad > bf->bf_nframes); + + tx_info->status.ampdu_len = bf->bf_nframes; + tx_info->status.ampdu_ack_len = bf->bf_nframes - nbad; + } + if ((ts->ts_status & ATH9K_TXERR_FILT) == 0 && (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0 && update_rc) { if (ieee80211_is_data(hdr->frame_control)) { @@ -2036,8 +2045,6 @@ static void ath_tx_rc_status(struct ath_ if ((ts->ts_status & ATH9K_TXERR_XRETRY) || (ts->ts_status & ATH9K_TXERR_FIFO)) tx_info->pad[0] |= ATH_TX_INFO_XRETRY; - tx_info->status.ampdu_len = bf->bf_nframes; - tx_info->status.ampdu_ack_len = bf->bf_nframes - nbad; } } @@ -2159,7 +2166,7 @@ static void ath_tx_processq(struct ath_s */ if (ts.ts_status & ATH9K_TXERR_XRETRY) bf->bf_state.bf_type |= BUF_XRETRY; - ath_tx_rc_status(bf, &ts, 0, txok, true); + ath_tx_rc_status(bf, &ts, txok ? 0 : 1, txok, true); } if (bf_isampdu(bf)) @@ -2288,7 +2295,7 @@ void ath_tx_edma_tasklet(struct ath_soft if (!bf_isampdu(bf)) { if (txs.ts_status & ATH9K_TXERR_XRETRY) bf->bf_state.bf_type |= BUF_XRETRY; - ath_tx_rc_status(bf, &txs, 0, txok, true); + ath_tx_rc_status(bf, &txs, txok ? 0 : 1, txok, true); } if (bf_isampdu(bf))