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 54cc0bb..8b6f363 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 +191,14 @@ 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]; + priv->survey[*chan_num].filled = SURVEY_INFO_NOISE_DBM | + SURVEY_INFO_CHANNEL_TIME | + SURVEY_INFO_CHANNEL_TIME_BUSY | + SURVEY_INFO_CHANNEL_TIME_TX; + tmp->channels[j].hw_value = (*chan_num); j++; + (*chan_num)++; } if (j == 0) { @@ -263,7 +271,7 @@ 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 +291,13 @@ 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 +336,9 @@ 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 +351,10 @@ free: kfree(list->channels); kfree(list); } + if (ret) { + kfree(priv->survey); + priv->survey = NULL; + } return ret; } @@ -853,10 +873,12 @@ 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/fwio.c b/drivers/net/wireless/p54/fwio.c index b6a061c..1bee007 100644 --- a/drivers/net/wireless/p54/fwio.c +++ b/drivers/net/wireless/p54/fwio.c @@ -385,6 +385,7 @@ int p54_setup_mac(struct p54_common *priv) setup->v2.osc_start_delay = cpu_to_le16(65535); } p54_tx(priv, skb); + priv->phy_idle = mode != P54_FILTER_TYPE_HIBERNATE; return 0; } @@ -626,6 +627,7 @@ int p54_set_ps(struct p54_common *priv) psm->exclude[0] = WLAN_EID_TIM; p54_tx(priv, skb); + priv->phy_ps = mode != P54_PSM_CAM; return 0; } diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c index a5a6d9e..c354393 100644 --- a/drivers/net/wireless/p54/main.c +++ b/drivers/net/wireless/p54/main.c @@ -278,6 +278,41 @@ 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) +{ + struct ieee80211_channel *chan = priv->curchan; + + if (priv->curchan) { + struct survey_info *info = &priv->survey[chan->hw_value]; + + /* only reset channel statistics. */ + info->channel_time = 0; + info->channel_time_busy = 0; + info->channel_time_tx = 0; + } + + 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; @@ -288,16 +323,22 @@ 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) { + WARN_ON(p54_wait_for_stats(dev)); ret = p54_scan(priv, P54_SCAN_EXIT, 0); if (ret) goto out; + priv->curchan = priv->hw->conf.channel; + p54_reset_stats(priv); + WARN_ON(p54_fetch_statistics(priv)); } if (changed & IEEE80211_CONF_CHANGE_PS) { + WARN_ON(p54_wait_for_stats(dev)); ret = p54_set_ps(priv); if (ret) goto out; } if (changed & IEEE80211_CONF_CHANGE_IDLE) { + WARN_ON(p54_wait_for_stats(dev)); ret = p54_setup_mac(priv); if (ret) goto out; @@ -541,14 +582,30 @@ 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) { + mutex_lock(&priv->conf_mutex); + err = p54_wait_for_stats(dev); + mutex_unlock(&priv->conf_mutex); + if (err) + return err; + } - if (idx != 0) + 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->noise = priv->survey[idx].noise; + survey->channel_time = priv->survey[idx].channel_time; + survey->channel_time_busy = priv->survey[idx].channel_time_busy; + survey->channel_time_tx = priv->survey[idx].channel_time_tx; + + chan = dev->conf.channel; + if (chan && chan->hw_value == idx) + survey->filled |= SURVEY_INFO_IN_USE; return 0; } @@ -686,11 +743,14 @@ 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); memset(&priv->mc_maclist[0], ~0, ETH_ALEN); + priv->curchan = NULL; + p54_reset_stats(priv); return dev; } EXPORT_SYMBOL_GPL(p54_init_common); @@ -730,11 +790,13 @@ 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..32e6bd1 100644 --- a/drivers/net/wireless/p54/p54.h +++ b/drivers/net/wireless/p54/p54.h @@ -199,6 +199,24 @@ struct p54_common { u8 tx_diversity_mask; unsigned int output_power; struct p54_rssi_db_entry *cur_rssi; + struct ieee80211_channel *curchan; + 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; @@ -220,6 +238,8 @@ struct p54_common { u32 basic_rate_mask; u16 aid; u8 coverage_class; + bool phy_idle; + bool phy_ps; bool powersave_override; __le32 beacon_req_id; struct completion beacon_comp; diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c index 042842e..573ca97 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)) @@ -522,9 +524,79 @@ static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb) 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; + + if (priv->phy_ps || priv->phy_idle) { + priv->survey_raw.timestamp = tsf32; + priv->survey_raw.cached_cca = cca; + priv->survey_raw.cached_tx = tx; + priv->survey_raw.cached_rssi = rssi; + goto out; + } + + /* 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->curchan; + 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; + } +out: 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) -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html