leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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 */