ath9k: implement extended channel utilization statistics via survey

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23350 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 104 insertions, 0 deletions

diff --git a/package/mac80211/patches/523-ath5k_use_common_counters.patch b/package/mac80211/patches/523-ath5k_use_common_counters.patch
new file mode 100644
index 0000000000..1899f8d465
--- /dev/null
+++ b/package/mac80211/patches/523-ath5k_use_common_counters.patch
@@ -0,0 +1,104 @@
+--- a/drivers/net/wireless/ath/ath5k/ani.c
++++ b/drivers/net/wireless/ath/ath5k/ani.c
+@@ -355,41 +355,28 @@ ath5k_ani_lower_immunity(struct ath5k_hw
+ 
+ 
+ /**
+- * ath5k_hw_ani_get_listen_time() - Calculate time spent listening
++ * ath5k_hw_ani_get_listen_time() - Update counters and return listening time
+  *
+  * Return an approximation of the time spent "listening" in milliseconds (ms)
+- * since the last call of this function by deducting the cycles spent
+- * transmitting and receiving from the total cycle count.
+- * Save profile count values for debugging/statistics and because we might want
+- * to use them later.
+- *
+- * We assume no one else clears these registers!
++ * since the last call of this function.
++ * Save a snapshot of the counter values for debugging/statistics.
+  */
+ static int
+ ath5k_hw_ani_get_listen_time(struct ath5k_hw *ah, struct ath5k_ani_state *as)
+ {
++	struct ath_common *common = ath5k_hw_common(ah);
+ 	int listen;
+ 
+-	/* freeze */
+-	ath5k_hw_reg_write(ah, AR5K_MIBC_FMC, AR5K_MIBC);
+-	/* read */
+-	as->pfc_cycles = ath5k_hw_reg_read(ah, AR5K_PROFCNT_CYCLE);
+-	as->pfc_busy = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RXCLR);
+-	as->pfc_tx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_TX);
+-	as->pfc_rx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RX);
+-	/* clear */
+-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_TX);
+-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RX);
+-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RXCLR);
+-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_CYCLE);
+-	/* un-freeze */
+-	ath5k_hw_reg_write(ah, 0, AR5K_MIBC);
++	spin_lock_bh(&common->cc_lock);
+ 
+-	/* TODO: where does 44000 come from? (11g clock rate?) */
+-	listen = (as->pfc_cycles - as->pfc_rx - as->pfc_tx) / 44000;
++	ath_hw_cycle_counters_update(common);
++	memcpy(&as->last_cc, &common->cc_ani, sizeof(as->last_cc));
++
++	/* clears common->cc_ani */
++	listen = ath_hw_get_listen_time(common);
++
++	spin_unlock_bh(&common->cc_lock);
+ 
+-	if (as->pfc_cycles == 0 || listen < 0)
+-		return 0;
+ 	return listen;
+ }
+ 
+--- a/drivers/net/wireless/ath/ath5k/ani.h
++++ b/drivers/net/wireless/ath/ath5k/ani.h
+@@ -75,10 +75,7 @@ struct ath5k_ani_state {
+ 	unsigned int		cck_errors;
+ 
+ 	/* debug/statistics only: numbers from last ANI calibration */
+-	unsigned int		pfc_tx;
+-	unsigned int		pfc_rx;
+-	unsigned int		pfc_busy;
+-	unsigned int		pfc_cycles;
++	struct ath_cycle_counters last_cc;
+ 	unsigned int		last_listen;
+ 	unsigned int		last_ofdm_errors;
+ 	unsigned int		last_cck_errors;
+--- a/drivers/net/wireless/ath/ath5k/debug.c
++++ b/drivers/net/wireless/ath/ath5k/debug.c
+@@ -715,20 +715,21 @@ static ssize_t read_file_ani(struct file
+ 	len += snprintf(buf+len, sizeof(buf)-len,
+ 			"beacon RSSI average:\t%d\n",
+ 			sc->ah->ah_beacon_rssi_avg.avg);
++
++#define CC_PRINT(_struct, _field) \
++	_struct._field, \
++	_struct.cycles > 0 ? \
++	_struct._field*100/_struct.cycles : 0
++
+ 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt tx\t\t%u\t(%d%%)\n",
+-			as->pfc_tx,
+-			as->pfc_cycles > 0 ?
+-			as->pfc_tx*100/as->pfc_cycles : 0);
++			CC_PRINT(as->last_cc, tx_frame));
+ 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt rx\t\t%u\t(%d%%)\n",
+-			as->pfc_rx,
+-			as->pfc_cycles > 0 ?
+-			as->pfc_rx*100/as->pfc_cycles : 0);
++			CC_PRINT(as->last_cc, rx_frame));
+ 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt busy\t\t%u\t(%d%%)\n",
+-			as->pfc_busy,
+-			as->pfc_cycles > 0 ?
+-			as->pfc_busy*100/as->pfc_cycles : 0);
++			CC_PRINT(as->last_cc, rx_busy));
++#undef CC_PRINT
+ 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt cycles\t\t%u\n",
+-			as->pfc_cycles);
++			as->last_cc.cycles);
+ 	len += snprintf(buf+len, sizeof(buf)-len,
+ 			"listen time\t\t%d\tlast: %d\n",
+ 			as->listen_time, as->last_listen);