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[PATCH] ipw2200: Exponential averaging for signal and noise Level

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This patch replaces sliding averaging by exponential averaging for
reporting the wireless statistics for signal and noise level for ipw2200.
See details from: http://www.ces.clemson.edu/linux/ipw2200_averages.shtml

Signed-off-by: Bill Moss <bmoss@clemson.edu>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Zhu Yi 2006-04-13 17:19:02 +08:00 committed by John W. Linville
parent 45a62ab3d6
commit 00d21de5c6
2 changed files with 22 additions and 18 deletions
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34
drivers/net/wireless/ipw2200.c
View file

@ -3771,6 +3771,13 @@ static void inline average_init(struct average *avg)
memset(avg, 0, sizeof(*avg));
}
#define DEPTH_RSSI 8
#define DEPTH_NOISE 16
static s16 exponential_average(s16 prev_avg, s16 val, u8 depth)
{
return ((depth-1)*prev_avg + val)/depth;
}
static void average_add(struct average *avg, s16 val)
{
avg->sum -= avg->entries[avg->pos];
@ -3800,8 +3807,8 @@ static void ipw_reset_stats(struct ipw_priv *priv)
priv->quality = 0;
average_init(&priv->average_missed_beacons);
average_init(&priv->average_rssi);
average_init(&priv->average_noise);
priv->exp_avg_rssi = -60;
priv->exp_avg_noise = -85 + 0x100;
priv->last_rate = 0;
priv->last_missed_beacons = 0;
@ -4008,7 +4015,7 @@ static void ipw_gather_stats(struct ipw_priv *priv)
IPW_DEBUG_STATS("Tx quality : %3d%% (%u errors, %u packets)\n",
tx_quality, tx_failures_delta, tx_packets_delta);
rssi = average_value(&priv->average_rssi);
rssi = priv->exp_avg_rssi;
signal_quality =
(100 *
(priv->ieee->perfect_rssi - priv->ieee->worst_rssi) *
@ -4023,7 +4030,7 @@ static void ipw_gather_stats(struct ipw_priv *priv)
else if (signal_quality < 1)
signal_quality = 0;
IPW_DEBUG_STATS("Signal level : %3d%% (%d dBm)\n",
IPW_ERROR("Signal level : %3d%% (%d dBm)\n",
signal_quality, rssi);
quality = min(beacon_quality,
@ -4577,11 +4584,10 @@ static void ipw_rx_notification(struct ipw_priv *priv,
case HOST_NOTIFICATION_NOISE_STATS:{
if (notif->size == sizeof(u32)) {
priv->last_noise =
(u8) (le32_to_cpu(notif->u.noise.value) &
0xff);
average_add(&priv->average_noise,
priv->last_noise);
priv->exp_avg_noise =
exponential_average(priv->exp_avg_noise,
(u8) (le32_to_cpu(notif->u.noise.value) & 0xff),
DEPTH_NOISE);
break;
}
@ -7837,9 +7843,9 @@ static void ipw_rx(struct ipw_priv *priv)
if (network_packet && priv->assoc_network) {
priv->assoc_network->stats.rssi =
stats.rssi;
average_add(&priv->average_rssi,
stats.rssi);
priv->last_rx_rssi = stats.rssi;
priv->exp_avg_rssi =
exponential_average(priv->exp_avg_rssi,
stats.rssi, DEPTH_RSSI);
}
IPW_DEBUG_RX("Frame: len=%u\n",
@ -9579,8 +9585,8 @@ static struct iw_statistics *ipw_get_wireless_stats(struct net_device *dev)
}
wstats->qual.qual = priv->quality;
wstats->qual.level = average_value(&priv->average_rssi);
wstats->qual.noise = average_value(&priv->average_noise);
wstats->qual.level = priv->exp_avg_rssi;
wstats->qual.noise = priv->exp_avg_noise;
wstats->qual.updated = IW_QUAL_QUAL_UPDATED | IW_QUAL_LEVEL_UPDATED |
IW_QUAL_NOISE_UPDATED | IW_QUAL_DBM;

6
drivers/net/wireless/ipw2200.h
View file

@ -1153,11 +1153,9 @@ struct ipw_priv {
u32 config;
u32 capability;
u8 last_rx_rssi;
u8 last_noise;
struct average average_missed_beacons;
struct average average_rssi;
struct average average_noise;
s16 exp_avg_rssi;
s16 exp_avg_noise;
u32 port_type;
int rx_bufs_min; /**< minimum number of bufs in Rx queue */
int rx_pend_max; /**< maximum pending buffers for one IRQ */