On Thursday 29 June 2006 06:08, Larry Finger wrote:
> This patch improves the statistics returned from bcm43xx_get_wireless_stats.
> The signal level comes
> from smoothing the rssi value returned by the firmware. The quality value is
> a hack derived from the
> smoothed rssi value and an assumed rssi_max of -25. If anyone has a better
> value, please let me
> know. The noise value is still the one calculated from the clean-room
> formula. On my system, this is
> roughly -65 dBm, which seems too high. I would appreciate getting any ideas
> on what other
> interface/driver combinations get for the noise value.
>
> Signed-Off-By: Larry Finger <[EMAIL PROTECTED]>
>
> ==========================================================
>
> diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_main.c
> b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
> index af97755..c80fdcd 100644
> --- a/drivers/net/wireless/bcm43xx/bcm43xx_main.c
> +++ b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
> @@ -1581,17 +1581,8 @@ static void handle_irq_noise(struct bcm4
> else
> average -= 48;
>
> -/* FIXME: This is wrong, but people want fancy stats. well... */
> -bcm->stats.noise = average;
> - if (average > -65)
> - bcm->stats.link_quality = 0;
> - else if (average > -75)
> - bcm->stats.link_quality = 1;
> - else if (average > -85)
> - bcm->stats.link_quality = 2;
> - else
> - bcm->stats.link_quality = 3;
> -// dprintk(KERN_INFO PFX "Link Quality: %u (avg was %d)\n",
> bcm->stats.link_quality, average);
> +/* FIXME: This matches the formula from the clean-room, but yields a value
> that is probably too
> large. */
> + bcm->stats.noise = average;
> drop_calculation:
> bcm->noisecalc.calculation_running = 0;
> return;
> diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_wx.c
> b/drivers/net/wireless/bcm43xx/bcm43xx_wx.c
> index 5c36e29..8224da1 100644
> --- a/drivers/net/wireless/bcm43xx/bcm43xx_wx.c
> +++ b/drivers/net/wireless/bcm43xx/bcm43xx_wx.c
> @@ -47,6 +47,8 @@ #include "bcm43xx_phy.h"
> #define BCM43xx_WX_VERSION 18
>
> #define MAX_WX_STRING 80
> +/* FIXME: the next line is a guess as to what the maximum value of rssi
> might be */
> +#define RSSI_MAX -25
>
>
> static int bcm43xx_wx_get_name(struct net_device *net_dev,
> @@ -227,15 +229,15 @@ static int bcm43xx_wx_get_rangeparams(st
>
> range->max_qual.qual = 100;
> /* TODO: Real max RSSI */
> - range->max_qual.level = 3;
> - range->max_qual.noise = 100;
> - range->max_qual.updated = 7;
> -
> - range->avg_qual.qual = 70;
> - range->avg_qual.level = 2;
> - range->avg_qual.noise = 40;
> - range->avg_qual.updated = 7;
> -
> + range->max_qual.level = -100;
> + range->max_qual.noise = -100;
> + range->max_qual.updated = IW_QUAL_ALL_UPDATED;
> +
> + range->avg_qual.qual = 50;
> + range->avg_qual.level = -40;
> + range->avg_qual.noise = -65;
> + range->avg_qual.updated = IW_QUAL_ALL_UPDATED;
> +
> range->min_rts = BCM43xx_MIN_RTS_THRESHOLD;
> range->max_rts = BCM43xx_MAX_RTS_THRESHOLD;
> range->min_frag = MIN_FRAG_THRESHOLD;
> @@ -827,6 +829,8 @@ static struct iw_statistics *bcm43xx_get
> struct bcm43xx_private *bcm = bcm43xx_priv(net_dev);
> struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
> struct iw_statistics *wstats;
> + struct ieee80211_network *network = NULL;
> + static int tmp_level = 0;
>
> wstats = &bcm->stats.wstats;
> if (!mac->associated) {
> @@ -849,11 +853,19 @@ static struct iw_statistics *bcm43xx_get
> return wstats;
> }
> /* fill in the real statistics when iface associated */
> - wstats->qual.qual = 100; // TODO: get the real signal quality
> - wstats->qual.level = 3 - bcm->stats.link_quality;
> + list_for_each_entry(network, &mac->ieee->network_list, list) {
> + if (!memcmp(mac->associnfo.bssid, network->bssid, ETH_ALEN)) {
> + if (!tmp_level) /* get initial value */
> + tmp_level = network->stats.rssi;
> + else /* smooth results */
> + tmp_level = (7 * tmp_level +
> network->stats.rssi)/8;
> + break;
> + }
> + }
You need to lock the ieee80211 lock here. Otherwise it might race and crash,
if some workqueue modifies the list inbetween.
> + wstats->qual.level = tmp_level;
> + wstats->qual.qual = 100 + tmp_level - RSSI_MAX; // TODO: get the real
> signal quality
> wstats->qual.noise = bcm->stats.noise;
> - wstats->qual.updated = IW_QUAL_QUAL_UPDATED | IW_QUAL_LEVEL_UPDATED |
> - IW_QUAL_NOISE_UPDATED;
> + wstats->qual.updated = IW_QUAL_ALL_UPDATED;
> wstats->discard.code = bcm->ieee->ieee_stats.rx_discards_undecryptable;
> wstats->discard.retries = bcm->ieee->ieee_stats.tx_retry_limit_exceeded;
> wstats->discard.nwid = bcm->ieee->ieee_stats.tx_discards_wrong_sa;
--
Greetings Michael.
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