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[PATCH] zd1211rw: Fix of signal strength and quality measurement 

Caused by a documentation issue I mixed up fields of the zd_status
structure. This patch fixes it and improves also the average
computation, which is now using only measurements of packets sent
by the access point.

Signed-off-by: Ulrich Kunitz <kune@deine-taler.de>
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ulrich Kunitz 2006-08-29 23:50:29 +01:00 committed by John W. Linville
parent 38f5745c5a
commit db888aed7e
3 changed files with 88 additions and 27 deletions
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61
drivers/net/wireless/zd1211rw/zd_chip.c
View File

@ -1430,9 +1430,43 @@ static int ofdm_qual_db(u8 status_quality, u8 rate, unsigned int size)
break;
}
switch (rate) {
case ZD_OFDM_RATE_6M:
case ZD_OFDM_RATE_9M:
i += 3;
break;
case ZD_OFDM_RATE_12M:
case ZD_OFDM_RATE_18M:
i += 5;
break;
case ZD_OFDM_RATE_24M:
case ZD_OFDM_RATE_36M:
i += 9;
break;
case ZD_OFDM_RATE_48M:
case ZD_OFDM_RATE_54M:
i += 15;
break;
default:
return -EINVAL;
}
return i;
}
static int ofdm_qual_percent(u8 status_quality, u8 rate, unsigned int size)
{
int r;
r = ofdm_qual_db(status_quality, rate, size);
ZD_ASSERT(r >= 0);
if (r < 0)
r = 0;
r = (r * 100)/29;
return r <= 100 ? r : 100;
}
static unsigned int log10times100(unsigned int x)
{
static const u8 log10[] = {
@ -1476,31 +1510,28 @@ static int cck_snr_db(u8 status_quality)
return r;
}
static int rx_qual_db(const void *rx_frame, unsigned int size,
const struct rx_status *status)
static int cck_qual_percent(u8 status_quality)
{
return (status->frame_status&ZD_RX_OFDM) ?
ofdm_qual_db(status->signal_quality_ofdm,
zd_ofdm_plcp_header_rate(rx_frame),
size) :
cck_snr_db(status->signal_quality_cck);
int r;
r = cck_snr_db(status_quality);
r = (100*r)/17;
return r <= 100 ? r : 100;
}
u8 zd_rx_qual_percent(const void *rx_frame, unsigned int size,
const struct rx_status *status)
{
int r = rx_qual_db(rx_frame, size, status);
if (r < 0)
r = 0;
r = (r * 100) / 14;
if (r > 100)
r = 100;
return r;
return (status->frame_status&ZD_RX_OFDM) ?
ofdm_qual_percent(status->signal_quality_ofdm,
zd_ofdm_plcp_header_rate(rx_frame),
size) :
cck_qual_percent(status->signal_quality_cck);
}
u8 zd_rx_strength_percent(u8 rssi)
{
int r = (rssi*100) / 30;
int r = (rssi*100) / 41;
if (r > 100)
r = 100;
return (u8) r;

43
drivers/net/wireless/zd1211rw/zd_mac.c
View File

@ -816,13 +816,25 @@ static int filter_rx(struct ieee80211_device *ieee,
return -EINVAL;
}
static void update_qual_rssi(struct zd_mac *mac, u8 qual_percent, u8 rssi)
static void update_qual_rssi(struct zd_mac *mac,
const u8 *buffer, unsigned int length,
u8 qual_percent, u8 rssi_percent)
{
unsigned long flags;
struct ieee80211_hdr_3addr *hdr;
int i;
hdr = (struct ieee80211_hdr_3addr *)buffer;
if (length < offsetof(struct ieee80211_hdr_3addr, addr3))
return;
if (memcmp(hdr->addr2, zd_mac_to_ieee80211(mac)->bssid, ETH_ALEN) != 0)
return;
spin_lock_irqsave(&mac->lock, flags);
mac->qual_average = (7 * mac->qual_average + qual_percent) / 8;
mac->rssi_average = (7 * mac->rssi_average + rssi) / 8;
i = mac->stats_count % ZD_MAC_STATS_BUFFER_SIZE;
mac->qual_buffer[i] = qual_percent;
mac->rssi_buffer[i] = rssi_percent;
mac->stats_count++;
spin_unlock_irqrestore(&mac->lock, flags);
}
@ -853,7 +865,6 @@ static int fill_rx_stats(struct ieee80211_rx_stats *stats,
if (stats->rate)
stats->mask |= IEEE80211_STATMASK_RATE;
update_qual_rssi(mac, stats->signal, stats->rssi);
return 0;
}
@ -877,6 +888,8 @@ int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
sizeof(struct rx_status);
buffer += ZD_PLCP_HEADER_SIZE;
update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
r = filter_rx(ieee, buffer, length, &stats);
if (r <= 0)
return r;
@ -981,17 +994,31 @@ struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
{
struct zd_mac *mac = zd_netdev_mac(ndev);
struct iw_statistics *iw_stats = &mac->iw_stats;
unsigned int i, count, qual_total, rssi_total;
memset(iw_stats, 0, sizeof(struct iw_statistics));
/* We are not setting the status, because ieee->state is not updated
* at all and this driver doesn't track authentication state.
*/
spin_lock_irq(&mac->lock);
iw_stats->qual.qual = mac->qual_average;
iw_stats->qual.level = mac->rssi_average;
iw_stats->qual.updated = IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED|
IW_QUAL_NOISE_INVALID;
count = mac->stats_count < ZD_MAC_STATS_BUFFER_SIZE ?
mac->stats_count : ZD_MAC_STATS_BUFFER_SIZE;
qual_total = rssi_total = 0;
for (i = 0; i < count; i++) {
qual_total += mac->qual_buffer[i];
rssi_total += mac->rssi_buffer[i];
}
spin_unlock_irq(&mac->lock);
iw_stats->qual.updated = IW_QUAL_NOISE_INVALID;
if (count > 0) {
iw_stats->qual.qual = qual_total / count;
iw_stats->qual.level = rssi_total / count;
iw_stats->qual.updated |=
IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED;
} else {
iw_stats->qual.updated |=
IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID;
}
/* TODO: update counter */
return iw_stats;
}

11
drivers/net/wireless/zd1211rw/zd_mac.h
View File

@ -1,4 +1,4 @@
/* zd_mac.c
/* zd_mac.h
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -87,9 +87,9 @@ struct rx_length_info {
#define RX_LENGTH_INFO_TAG 0x697e
struct rx_status {
u8 signal_quality_cck;
/* rssi */
u8 signal_strength;
u8 signal_quality_cck;
u8 signal_quality_ofdm;
u8 decryption_type;
u8 frame_status;
@ -120,14 +120,17 @@ enum mac_flags {
MAC_FIXED_CHANNEL = 0x01,
};
#define ZD_MAC_STATS_BUFFER_SIZE 16
struct zd_mac {
struct net_device *netdev;
struct zd_chip chip;
spinlock_t lock;
/* Unlocked reading possible */
struct iw_statistics iw_stats;
u8 qual_average;
u8 rssi_average;
unsigned int stats_count;
u8 qual_buffer[ZD_MAC_STATS_BUFFER_SIZE];
u8 rssi_buffer[ZD_MAC_STATS_BUFFER_SIZE];
u8 regdomain;
u8 default_regdomain;
u8 requested_channel;