From db888aed7e83559d61cff04bf002d0fb80ecbfa7 Mon Sep 17 00:00:00 2001 From: Ulrich Kunitz Date: Tue, 29 Aug 2006 23:50:29 +0100 Subject: [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 Signed-off-by: Daniel Drake Signed-off-by: John W. Linville --- drivers/net/wireless/zd1211rw/zd_chip.c | 61 +++++++++++++++++++++++++-------- drivers/net/wireless/zd1211rw/zd_mac.c | 43 ++++++++++++++++++----- drivers/net/wireless/zd1211rw/zd_mac.h | 11 +++--- 3 files changed, 88 insertions(+), 27 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/wireless/zd1211rw/zd_chip.c b/drivers/net/wireless/zd1211rw/zd_chip.c index da9d06bdb818..aa792821854e 100644 --- a/drivers/net/wireless/zd1211rw/zd_chip.c +++ b/drivers/net/wireless/zd1211rw/zd_chip.c @@ -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; diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c index d6f3e02a0b54..a9bd80a08613 100644 --- a/drivers/net/wireless/zd1211rw/zd_mac.c +++ b/drivers/net/wireless/zd1211rw/zd_mac.c @@ -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; } diff --git a/drivers/net/wireless/zd1211rw/zd_mac.h b/drivers/net/wireless/zd1211rw/zd_mac.h index 71e382c589ee..b3ba49b84634 100644 --- a/drivers/net/wireless/zd1211rw/zd_mac.h +++ b/drivers/net/wireless/zd1211rw/zd_mac.h @@ -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; -- cgit v1.2.1