add support for ack timeout estimation in ath9k driver

index fd0158f..e88896c 100644
@@ -935,21 +935,21 @@ static void ath9k_hw_set_sifs_time(struct ath_hw *ah, u32 us)
 	REG_WRITE(ah, AR_D_GBL_IFS_SIFS, val);
 }
 
-static void ath9k_hw_setslottime(struct ath_hw *ah, u32 us)
+void ath9k_hw_setslottime(struct ath_hw *ah, u32 us)
 {
 	u32 val = ath9k_hw_mac_to_clks(ah, us);
 	val = min(val, (u32) 0xFFFF);
 	REG_WRITE(ah, AR_D_GBL_IFS_SLOT, val);
 }
 
-static void ath9k_hw_set_ack_timeout(struct ath_hw *ah, u32 us)
+void ath9k_hw_set_ack_timeout(struct ath_hw *ah, u32 us)
 {
 	u32 val = ath9k_hw_mac_to_clks(ah, us);
 	val = min(val, (u32) MS(0xFFFFFFFF, AR_TIME_OUT_ACK));
 	REG_RMW_FIELD(ah, AR_TIME_OUT, AR_TIME_OUT_ACK, val);
 }
 
-static void ath9k_hw_set_cts_timeout(struct ath_hw *ah, u32 us)
+void ath9k_hw_set_cts_timeout(struct ath_hw *ah, u32 us)
 {
 	u32 val = ath9k_hw_mac_to_clks(ah, us);
 	val = min(val, (u32) MS(0xFFFFFFFF, AR_TIME_OUT_CTS));

index 51b4ebe..f36d971 100644
@@ -1080,6 +1080,10 @@ void ar9002_hw_load_ani_reg(struct ath_hw *ah, struct ath9k_channel *chan);
 void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning);
 void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan);
 
+void ath9k_hw_set_ack_timeout(struct ath_hw *ah, u32 us);
+void ath9k_hw_set_cts_timeout(struct ath_hw *ah, u32 us);
+void ath9k_hw_setslottime(struct ath_hw *ah, u32 us);
+
 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
 static inline bool ath9k_hw_btcoex_is_enabled(struct ath_hw *ah)
 {

index 741b38d..b1d8d0e 100644
@@ -377,6 +377,13 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds,
 	ts->evm1 = ads->AR_TxEVM1;
 	ts->evm2 = ads->AR_TxEVM2;
 
+	status = ACCESS_ONCE(ads->ds_ctl4);
+	ts->duration[0] = MS(status, AR_PacketDur0);
+	ts->duration[1] = MS(status, AR_PacketDur1);
+	status = ACCESS_ONCE(ads->ds_ctl5);
+	ts->duration[2] = MS(status, AR_PacketDur2);
+	ts->duration[3] = MS(status, AR_PacketDur3);
+
 	return 0;
 }
 

index 729ffbf..d261c6e 100644
@@ -351,9 +351,11 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds,
 				 struct ath_tx_status *ts)
 {
 	struct ar9003_txs *ads;
+	struct ar9003_txc *adc;
 	u32 status;
 
 	ads = &ah->ts_ring[ah->ts_tail];
+	adc = (struct ar9003_txc *)ads;
 
 	status = ACCESS_ONCE(ads->status8);
 	if ((status & AR_TxDone) == 0)

@@ -422,6 +424,13 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds,
 	ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11);
 	ts->ts_rssi_ext2 = MS(status, AR_TxRSSIAnt12);
 
+	status = ACCESS_ONCE(adc->ctl15);
+	ts->duration[0] = MS(status, AR_PacketDur0);
+	ts->duration[1] = MS(status, AR_PacketDur1);
+	status = ACCESS_ONCE(adc->ctl16);
+	ts->duration[2] = MS(status, AR_PacketDur2);
+	ts->duration[3] = MS(status, AR_PacketDur3);
+
 	memset(ads, 0, sizeof(*ads));
 
 	return 0;

index da76867..06efbe8 100644
@@ -121,6 +121,7 @@ struct ath_tx_status {
 	u32 evm0;
 	u32 evm1;
 	u32 evm2;
+	u32 duration[4];
 };
 
 struct ath_rx_status {

index fd9e530..4e51072 100644
@@ -234,6 +234,7 @@ void ath_printk(const char *level, const struct ath_common *common,
  *	AR9462.
  * @ATH_DBG_DFS: radar datection
  * @ATH_DBG_WOW: Wake on Wireless
+ * @ATH_DBG_DYNACK: dynack handling
  * @ATH_DBG_ANY: enable all debugging
  *
  * The debug level is used to control the amount and type of debugging output

@@ -261,6 +262,7 @@ enum ATH_DEBUG {
 	ATH_DBG_MCI		= 0x00008000,
 	ATH_DBG_DFS		= 0x00010000,
 	ATH_DBG_WOW		= 0x00020000,
+	ATH_DBG_DYNACK		= 0x00040000,
 	ATH_DBG_ANY		= 0xffffffff
 };
 

index 11b5e4d..65a2587 100644
@@ -272,6 +272,9 @@ struct ath_node {
 	struct ath_rx_rate_stats rx_rate_stats;
 #endif
 	u8 key_idx[4];
+
+	u32 ackto;
+	struct list_head list;
 };
 
 struct ath_tx_control {

348 lines not on this page · raw message

96 lines not on this page · raw message

index e88896c..9a6b113 100644
@@ -647,6 +647,8 @@ int ath9k_hw_init(struct ath_hw *ah)
 		return ret;
 	}
 
+	ath_dynack_init(ah);
+
 	return 0;
 }
 EXPORT_SYMBOL(ath9k_hw_init);

index f36d971..b9eef33 100644
@@ -29,6 +29,7 @@
 #include "reg.h"
 #include "phy.h"
 #include "btcoex.h"
+#include "dynack.h"
 
 #include "../regd.h"
 

@@ -924,6 +925,8 @@ struct ath_hw {
 	int (*external_reset)(void);
 
 	const struct firmware *eeprom_blob;
+
+	struct ath_dynack dynack;
 };
 
 struct ath_bus_ops {

index 9a6b113..b2ca47a 100644
@@ -1055,6 +1055,14 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah)
 		ctstimeout += 48 - sifstime - ah->slottime;
 	}
 
+	if (ah->dynack.enabled) {
+		acktimeout = ah->dynack.ackto;
+		ctstimeout = acktimeout;
+		slottime = (acktimeout - 3) / 2;
+	} else {
+		ah->dynack.ackto = acktimeout;
+	}
+
 	ath9k_hw_set_sifs_time(ah, sifstime);
 	ath9k_hw_setslottime(ah, slottime);
 	ath9k_hw_set_ack_timeout(ah, acktimeout);

index 74ab1d0..ad317a4 100644
@@ -991,6 +991,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 	unsigned long flags;
 	dma_addr_t new_buf_addr;
 	unsigned int budget = 512;
+	struct ieee80211_hdr *hdr;
 
 	if (edma)
 		dma_type = DMA_BIDIRECTIONAL;

@@ -1120,6 +1121,10 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		ath9k_apply_ampdu_details(sc, &rs, rxs);
 		ath_debug_rate_stats(sc, &rs, skb);
 
+		hdr = (struct ieee80211_hdr *)skb->data;
+		if (ieee80211_is_ack(hdr->frame_control))
+			ath_dynack_sample_ack_ts(sc->sc_ah, skb, rs.rs_tstamp);
+
 		ieee80211_rx(hw, skb);
 
 requeue_drop_frag:

index d4927c9..9497ed7 100644
@@ -588,6 +588,10 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
 				memcpy(tx_info->control.rates, rates, sizeof(rates));
 				ath_tx_rc_status(sc, bf, ts, nframes, nbad, txok);
 				rc_update = false;
+				if (bf == bf->bf_lastbf)
+					ath_dynack_sample_tx_ts(sc->sc_ah,
+								bf->bf_mpdu,
+								ts);
 			}
 
 			ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,

@@ -688,6 +692,7 @@ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
 			memcpy(info->control.rates, bf->rates,
 			       sizeof(info->control.rates));
 			ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
+			ath_dynack_sample_tx_ts(sc->sc_ah, bf->bf_mpdu, ts);
 		}
 		ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
 	} else

index ad317a4..cc5ba4a 100644
@@ -398,7 +398,7 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 	if (sc->sc_ah->is_monitoring)
 		rfilt |= ATH9K_RX_FILTER_PROM;
 
-	if (sc->rx.rxfilter & FIF_CONTROL)
+	if ((sc->rx.rxfilter & FIF_CONTROL) || sc->sc_ah->dynack.enabled)
 		rfilt |= ATH9K_RX_FILTER_CONTROL;
 
 	if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&

index ce073e9..de6ea5a 100644
@@ -1169,6 +1169,81 @@ static const struct file_operations fops_btcoex = {
 };
 #endif
 
+#ifdef CONFIG_ATH9K_DYNACK
+/* enable/disable dynack processing */
+static ssize_t read_file_dynack(struct file *file, char __user *user_buf,
+				size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	struct ath_hw *ah = sc->sc_ah;
+	char buf[32];
+	unsigned int len;
+
+	len = sprintf(buf, "%u\n", ah->dynack.enabled);
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_dynack(struct file *file, const char __user *user_buf,
+				 size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	struct ath_hw *ah = sc->sc_ah;
+	char buf[32];
+	unsigned long dynack;
+	ssize_t len;
+	u32 rfilt;
+
+	len = min(count, sizeof(buf) - 1);
+	if (copy_from_user(buf, user_buf, len))
+		return -EFAULT;
+
+	buf[len] = '\0';
+	if (kstrtoul(buf, 0, &dynack))
+			return -EINVAL;
+
+	ah->dynack.enabled = dynack;
+
+	rfilt = ath_calcrxfilter(sc);
+	ath9k_hw_setrxfilter(ah, rfilt);
+
+	if (ah->dynack.enabled)
+		ath_dynack_reset(ah);
+	else
+		ath9k_hw_init_global_settings(ah);
+
+	return count;
+}
+
+static const struct file_operations fops_dynack = {
+	.read = read_file_dynack,
+	.write = write_file_dynack,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
+static ssize_t read_file_ackto(struct file *file, char __user *user_buf,
+			       size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	struct ath_hw *ah = sc->sc_ah;
+	char buf[32];
+	unsigned int len;
+
+	len = sprintf(buf, "%u %c\n", ah->dynack.ackto,
+		      (ah->dynack.enabled) ? 'A' : 'S');
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_ackto = {
+	.read = read_file_ackto,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+#endif
+
 /* Ethtool support for get-stats */
 
 #define AMKSTR(nm) #nm "_BE", #nm "_BK", #nm "_VI", #nm "_VO"

@@ -1374,5 +1449,12 @@ int ath9k_init_debug(struct ath_hw *ah)
 			    &fops_btcoex);
 #endif
 
+#ifdef CONFIG_ATH9K_DYNACK
+	debugfs_create_file("dynack", S_IRUSR | S_IWUSR,
+			    sc->debug.debugfs_phy, sc, &fops_dynack);
+	debugfs_create_file("ack_to", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			    sc, &fops_ackto);
+#endif
+
 	return 0;
 }

index e6ac8d2..689db57 100644
@@ -1969,6 +1969,7 @@ static void ath9k_set_coverage_class(struct ieee80211_hw *hw, u8 coverage_class)
 
 	mutex_lock(&sc->mutex);
 	ah->coverage_class = coverage_class;
+	ah->dynack.enabled = false;
 
 	ath9k_ps_wakeup(sc);
 	ath9k_hw_init_global_settings(ah);

index 689db57..93ad6c1 100644
@@ -358,12 +358,16 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
 	memset(&an->key_idx, 0, sizeof(an->key_idx));
 
 	ath_tx_node_init(sc, an);
+
+	ath_dynack_node_init(sc->sc_ah, an);
 }
 
 static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta)
 {
 	struct ath_node *an = (struct ath_node *)sta->drv_priv;
 	ath_tx_node_cleanup(sc, an);
+
+	ath_dynack_node_deinit(sc->sc_ah, an);
 }
 
 void ath9k_tasklet(unsigned long data)