The firmware keeps track of channel usage. This data can
be used by the automatic channel selection to find the best
channel.
Survey data from wlan4
frequency: 5200 MHz [in use]
noise: -91 dBm
channel active time: 811909 ms
channel busy time: 63395 ms
channel transmit time: 59636 ms
Survey data from wlan4
frequency: 5210 MHz
noise: -91 dBm
channel active time: 121 ms
channel busy time: 119 ms
channel transmit time: 0 ms
---
diff --git a/drivers/net/wireless/p54/eeprom.c b/drivers/net/wireless/p54/eeprom.c
index bdb571f..331f4da 100644
--- a/drivers/net/wireless/p54/eeprom.c
+++ b/drivers/net/wireless/p54/eeprom.c
@@ -145,6 +145,7 @@ static int p54_fill_band_bitrates(struct ieee80211_hw *dev,
static int p54_generate_band(struct ieee80211_hw *dev,
struct p54_channel_list *list,
+ unsigned int *chan_num,
enum ieee80211_band band)
{
struct p54_common *priv = dev->priv;
@@ -190,7 +191,10 @@ static int p54_generate_band(struct ieee80211_hw *dev,
tmp->channels[j].band = chan->band;
tmp->channels[j].center_freq = chan->freq;
+ priv->survey[*chan_num].channel = &tmp->channels[j];
+ tmp->channels[j].hw_value = (*chan_num);
j++;
+ (*chan_num)++;
}
if (j == 0) {
@@ -263,7 +267,7 @@ static int p54_generate_channel_lists(struct ieee80211_hw *dev)
{
struct p54_common *priv = dev->priv;
struct p54_channel_list *list;
- unsigned int i, j, max_channel_num;
+ unsigned int i, j, k, max_channel_num;
int ret = 0;
u16 freq;
@@ -283,6 +287,13 @@ static int p54_generate_channel_lists(struct ieee80211_hw *dev)
ret = -ENOMEM;
goto free;
}
+ priv->chan_num = max_channel_num;
+ priv->survey = kzalloc(sizeof(struct survey_info) * max_channel_num,
+ GFP_KERNEL);
+ if (!priv->survey) {
+ ret = -ENOMEM;
+ goto free;
+ }
list->max_entries = max_channel_num;
list->channels = kzalloc(sizeof(struct p54_channel_entry) *
@@ -321,8 +332,9 @@ static int p54_generate_channel_lists(struct ieee80211_hw *dev)
sort(list->channels, list->entries, sizeof(struct p54_channel_entry),
p54_compare_channels, NULL);
+ k = 0;
for (i = 0, j = 0; i < IEEE80211_NUM_BANDS; i++) {
- if (p54_generate_band(dev, list, i) == 0)
+ if (p54_generate_band(dev, list, &k, i) == 0)
j++;
}
if (j == 0) {
@@ -335,6 +347,10 @@ free:
kfree(list->channels);
kfree(list);
}
+ if (ret) {
+ kfree(priv->survey);
+ priv->survey = NULL;
+ }
return ret;
}
@@ -853,10 +869,12 @@ err:
kfree(priv->output_limit);
kfree(priv->curve_data);
kfree(priv->rssi_db);
+ kfree(priv->survey);
priv->iq_autocal = NULL;
priv->output_limit = NULL;
priv->curve_data = NULL;
priv->rssi_db = NULL;
+ priv->survey = NULL;
wiphy_err(dev->wiphy, "eeprom parse failed!\n");
return err;
diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c
index 03198ed..a68be32 100644
--- a/drivers/net/wireless/p54/main.c
+++ b/drivers/net/wireless/p54/main.c
@@ -278,6 +278,30 @@ static void p54_remove_interface(struct ieee80211_hw *dev,
mutex_unlock(&priv->conf_mutex);
}
+static int p54_wait_for_stats(struct ieee80211_hw *dev)
+{
+ struct p54_common *priv = dev->priv;
+ int ret;
+
+ priv->update_stats = true;
+ ret = p54_fetch_statistics(priv);
+ if (ret)
+ return ret;
+
+ ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
+ if (ret == 0)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static void p54_reset_stats(struct p54_common *priv)
+{
+ priv->survey_raw.active = 0;
+ priv->survey_raw.cca = 0;
+ priv->survey_raw.tx = 0;
+}
+
static int p54_config(struct ieee80211_hw *dev, u32 changed)
{
int ret = 0;
@@ -288,9 +312,16 @@ static int p54_config(struct ieee80211_hw *dev, u32 changed)
if (changed & IEEE80211_CONF_CHANGE_POWER)
priv->output_power = conf->power_level << 2;
if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
+ ret = p54_wait_for_stats(dev);
+ if (ret)
+ goto out;
ret = p54_scan(priv, P54_SCAN_EXIT, 0);
if (ret)
goto out;
+ p54_reset_stats(priv);
+ ret = p54_fetch_statistics(priv);
+ if (ret)
+ return ret;
}
if (changed & IEEE80211_CONF_CHANGE_PS) {
ret = p54_set_ps(priv);
@@ -541,14 +572,27 @@ static int p54_get_survey(struct ieee80211_hw *dev, int idx,
struct survey_info *survey)
{
struct p54_common *priv = dev->priv;
- struct ieee80211_conf *conf = &dev->conf;
+ struct ieee80211_channel *chan;
+ int err;
- if (idx != 0)
+ if (idx == 0) {
+ err = p54_wait_for_stats(dev);
+ if (err)
+ return err;
+ }
+
+ if (idx >= priv->chan_num)
return -ENOENT;
- survey->channel = conf->channel;
- survey->filled = SURVEY_INFO_NOISE_DBM;
- survey->noise = clamp_t(s8, priv->noise, -128, 127);
+ memcpy(survey, &priv->survey[idx], sizeof(*survey));
+ survey->filled = SURVEY_INFO_NOISE_DBM |
+ SURVEY_INFO_CHANNEL_TIME |
+ SURVEY_INFO_CHANNEL_TIME_BUSY |
+ SURVEY_INFO_CHANNEL_TIME_TX;
+
+ chan = dev->conf.channel;
+ if (chan && chan->hw_value == idx)
+ survey->filled |= SURVEY_INFO_IN_USE;
return 0;
}
@@ -686,6 +730,7 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
mutex_init(&priv->conf_mutex);
mutex_init(&priv->eeprom_mutex);
+ init_completion(&priv->stat_comp);
init_completion(&priv->eeprom_comp);
init_completion(&priv->beacon_comp);
INIT_DELAYED_WORK(&priv->work, p54_work);
@@ -730,11 +775,13 @@ void p54_free_common(struct ieee80211_hw *dev)
kfree(priv->curve_data);
kfree(priv->rssi_db);
kfree(priv->used_rxkeys);
+ kfree(priv->survey);
priv->iq_autocal = NULL;
priv->output_limit = NULL;
priv->curve_data = NULL;
priv->rssi_db = NULL;
priv->used_rxkeys = NULL;
+ priv->survey = NULL;
ieee80211_free_hw(dev);
}
EXPORT_SYMBOL_GPL(p54_free_common);
diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h
index 799d05e..6d2c39b 100644
--- a/drivers/net/wireless/p54/p54.h
+++ b/drivers/net/wireless/p54/p54.h
@@ -199,6 +199,23 @@ struct p54_common {
u8 tx_diversity_mask;
unsigned int output_power;
struct p54_rssi_db_entry *cur_rssi;
+ struct survey_info *survey;
+ unsigned int chan_num;
+ struct completion stat_comp;
+ bool update_stats;
+ struct {
+ unsigned int timestamp;
+
+ unsigned int cached_cca;
+ unsigned int cached_tx;
+ unsigned int cached_rssi;
+
+ u64 active;
+ u64 cca;
+ u64 tx;
+ u64 rssi;
+ } survey_raw;
+
int noise;
/* calibration, output power limit and rssi<->dBm conversation data */
struct pda_iq_autocal_entry *iq_autocal;
diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c
index 4d28b52..992dac1 100644
--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@@ -507,6 +507,8 @@ static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
struct sk_buff *tmp;
+ struct ieee80211_channel *chan;
+ unsigned int i, rssi, tx, cca, dtime, dtotal, dcca, dtx, drssi, unit;
u32 tsf32;
if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
@@ -520,11 +522,72 @@ static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
-
priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
+ cca = le32_to_cpu(stats->sample_cca);
+ tx = le32_to_cpu(stats->sample_tx);
+ rssi = 0;
+ for (i = 0; i < ARRAY_SIZE(stats->sample_noise); i++)
+ rssi += le32_to_cpu(stats->sample_noise[i]);
+
+ dcca = cca - priv->survey_raw.cached_cca;
+ drssi = rssi - priv->survey_raw.cached_rssi;
+ dtx = tx - priv->survey_raw.cached_tx;
+ dtotal = dcca + drssi + dtx;
+ dtime = tsf32 - priv->survey_raw.timestamp;
+
+ /* only once one needed, or every 900 ms */
+ if (priv->update_stats || dtime >= 900000) {
+ /*
+ * STSW450X LMAC API page 26 - 3.8 Statistics
+ * "The exact measurement period can be derived from the
+ * timestamp memeber"
+ */
+ priv->survey_raw.timestamp = tsf32;
+ priv->update_stats = false;
+
+ /*
+ * STSW450X LMAC API page 26 - 3.8.1 Noise histogram
+ * The LMAC samples RSSI, CCA and transmit state at regular
+ * periods (typically 8 times per 1k [as in 1024] usec.
+ */
+
+ if (dtotal) {
+ /* 1024 usec / 8 times = 128 usec / time */
+ unit = dtime / dtotal;
+
+ priv->survey_raw.active += dtotal * unit;
+
+ if (dcca) {
+ priv->survey_raw.cca += dcca * unit;
+ priv->survey_raw.cached_cca = cca;
+ }
+
+ if (dtx) {
+ priv->survey_raw.tx += dtx * unit;
+ priv->survey_raw.cached_tx = tx;
+ }
+
+ if (drssi) {
+ priv->survey_raw.rssi += drssi * unit;
+ priv->survey_raw.cached_rssi = rssi;
+ }
+ }
+ }
+
+ chan = priv->hw->conf.channel;
+ if (chan) {
+ struct survey_info *survey = &priv->survey[chan->hw_value];
+
+ survey->noise = clamp_t(s8, priv->noise, -128, 127);
+ survey->channel_time = priv->survey_raw.active / 1024;
+ survey->channel_time_tx = priv->survey_raw.tx / 1024;
+ survey->channel_time_busy = priv->survey_raw.cca / 1024 +
+ survey->channel_time_tx;
+ }
tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
dev_kfree_skb_any(tmp);
+ complete(&priv->stat_comp);
}
static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
--
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