ath9k: fix some bugs related to txop limit handling and aggregation

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32658 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 147 insertions, 0 deletions

diff --git a/package/mac80211/patches/568-ath9k_fix_txop_limit.patch b/package/mac80211/patches/568-ath9k_fix_txop_limit.patch
new file mode 100644
index 000000000..255ec2942
--- /dev/null
+++ b/package/mac80211/patches/568-ath9k_fix_txop_limit.patch
@@ -0,0 +1,22 @@
+--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
++++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+@@ -1351,7 +1351,7 @@ static int ath9k_htc_conf_tx(struct ieee
+ 	qi.tqi_aifs = params->aifs;
+ 	qi.tqi_cwmin = params->cw_min;
+ 	qi.tqi_cwmax = params->cw_max;
+-	qi.tqi_burstTime = params->txop;
++	qi.tqi_burstTime = params->txop * 32;
+ 
+ 	qnum = get_hw_qnum(queue, priv->hwq_map);
+ 
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1359,7 +1359,7 @@ static int ath9k_conf_tx(struct ieee8021
+ 	qi.tqi_aifs = params->aifs;
+ 	qi.tqi_cwmin = params->cw_min;
+ 	qi.tqi_cwmax = params->cw_max;
+-	qi.tqi_burstTime = params->txop;
++	qi.tqi_burstTime = params->txop * 32;
+ 
+ 	ath_dbg(common, CONFIG,
+ 		"Configure tx [queue/halq] [%d/%d], aifs: %d, cw_min: %d, cw_max: %d, txop: %d\n",
diff --git a/package/mac80211/patches/569-ath9k_fix_max_aggr_duration.patch b/package/mac80211/patches/569-ath9k_fix_max_aggr_duration.patch
new file mode 100644
index 000000000..b2fbf59f3
--- /dev/null
+++ b/package/mac80211/patches/569-ath9k_fix_max_aggr_duration.patch
@@ -0,0 +1,125 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -298,6 +298,7 @@ struct ath_tx {
+ 	struct ath_descdma txdma;
+ 	struct ath_txq *txq_map[WME_NUM_AC];
+ 	u32 txq_max_pending[WME_NUM_AC];
++	u16 max_aggr_framelen[WME_NUM_AC][4][32];
+ };
+ 
+ struct ath_rx_edma {
+@@ -342,6 +343,7 @@ int ath_tx_init(struct ath_softc *sc, in
+ void ath_tx_cleanup(struct ath_softc *sc);
+ int ath_txq_update(struct ath_softc *sc, int qnum,
+ 		   struct ath9k_tx_queue_info *q);
++void ath_update_max_aggr_framelen(struct ath_softc *sc, int queue, int txop);
+ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
+ 		 struct ath_tx_control *txctl);
+ void ath_tx_tasklet(struct ath_softc *sc);
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -29,6 +29,8 @@
+ #define HT_LTF(_ns)             (4 * (_ns))
+ #define SYMBOL_TIME(_ns)        ((_ns) << 2) /* ns * 4 us */
+ #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5)  /* ns * 3.6 us */
++#define TIME_SYMBOLS(t)         ((t) >> 2)
++#define TIME_SYMBOLS_HALFGI(t)  (((t) * 5 - 4) / 18)
+ #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
+ #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
+ 
+@@ -74,33 +76,6 @@ enum {
+ 	MCS_HT40_SGI,
+ };
+ 
+-static int ath_max_4ms_framelen[4][32] = {
+-	[MCS_HT20] = {
+-		3212,  6432,  9648,  12864,  19300,  25736,  28952,  32172,
+-		6424,  12852, 19280, 25708,  38568,  51424,  57852,  64280,
+-		9628,  19260, 28896, 38528,  57792,  65532,  65532,  65532,
+-		12828, 25656, 38488, 51320,  65532,  65532,  65532,  65532,
+-	},
+-	[MCS_HT20_SGI] = {
+-		3572,  7144,  10720,  14296,  21444,  28596,  32172,  35744,
+-		7140,  14284, 21428,  28568,  42856,  57144,  64288,  65532,
+-		10700, 21408, 32112,  42816,  64228,  65532,  65532,  65532,
+-		14256, 28516, 42780,  57040,  65532,  65532,  65532,  65532,
+-	},
+-	[MCS_HT40] = {
+-		6680,  13360,  20044,  26724,  40092,  53456,  60140,  65532,
+-		13348, 26700,  40052,  53400,  65532,  65532,  65532,  65532,
+-		20004, 40008,  60016,  65532,  65532,  65532,  65532,  65532,
+-		26644, 53292,  65532,  65532,  65532,  65532,  65532,  65532,
+-	},
+-	[MCS_HT40_SGI] = {
+-		7420,  14844,  22272,  29696,  44544,  59396,  65532,  65532,
+-		14832, 29668,  44504,  59340,  65532,  65532,  65532,  65532,
+-		22232, 44464,  65532,  65532,  65532,  65532,  65532,  65532,
+-		29616, 59232,  65532,  65532,  65532,  65532,  65532,  65532,
+-	}
+-};
+-
+ /*********************/
+ /* Aggregation logic */
+ /*********************/
+@@ -648,6 +623,7 @@ static u32 ath_lookup_rate(struct ath_so
+ 	struct ieee80211_tx_rate *rates;
+ 	u32 max_4ms_framelen, frmlen;
+ 	u16 aggr_limit, bt_aggr_limit, legacy = 0;
++	int q = tid->ac->txq->mac80211_qnum;
+ 	int i;
+ 
+ 	skb = bf->bf_mpdu;
+@@ -680,7 +656,7 @@ static u32 ath_lookup_rate(struct ath_so
+ 		if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
+ 			modeidx++;
+ 
+-		frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
++		frmlen = sc->tx.max_aggr_framelen[q][modeidx][rates[i].idx];
+ 		max_4ms_framelen = min(max_4ms_framelen, frmlen);
+ 	}
+ 
+@@ -927,6 +903,44 @@ static u32 ath_pkt_duration(struct ath_s
+ 	return duration;
+ }
+ 
++static int ath_max_framelen(int usec, int mcs, bool ht40, bool sgi)
++{
++	int streams = HT_RC_2_STREAMS(mcs);
++	int symbols, bits;
++	int bytes = 0;
++
++	symbols = sgi ? TIME_SYMBOLS_HALFGI(usec) : TIME_SYMBOLS(usec);
++	bits = symbols * bits_per_symbol[mcs % 8][ht40] * streams;
++	bits -= OFDM_PLCP_BITS;
++	bytes = bits / 8;
++	bytes -= L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
++	if (bytes > 65532)
++		bytes = 65532;
++
++	return bytes;
++}
++
++void ath_update_max_aggr_framelen(struct ath_softc *sc, int queue, int txop)
++{
++	u16 *cur_ht20, *cur_ht20_sgi, *cur_ht40, *cur_ht40_sgi;
++	int mcs;
++
++	/* 4ms is the default (and maximum) duration */
++	if (!txop || txop > 4096)
++		txop = 4096;
++
++	cur_ht20 = sc->tx.max_aggr_framelen[queue][MCS_HT20];
++	cur_ht20_sgi = sc->tx.max_aggr_framelen[queue][MCS_HT20_SGI];
++	cur_ht40 = sc->tx.max_aggr_framelen[queue][MCS_HT40];
++	cur_ht40_sgi = sc->tx.max_aggr_framelen[queue][MCS_HT40_SGI];
++	for (mcs = 0; mcs < 32; mcs++) {
++		cur_ht20[mcs] = ath_max_framelen(txop, mcs, false, false);
++		cur_ht20_sgi[mcs] = ath_max_framelen(txop, mcs, false, true);
++		cur_ht40[mcs] = ath_max_framelen(txop, mcs, true, false);
++		cur_ht40_sgi[mcs] = ath_max_framelen(txop, mcs, true, true);
++	}
++}
++
+ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf,
+ 			     struct ath_tx_info *info, int len)
+ {