Return-path: Received: from na3sys009aog109.obsmtp.com ([74.125.149.201]:39881 "EHLO na3sys009aog109.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752109Ab2EaMij (ORCPT ); Thu, 31 May 2012 08:38:39 -0400 Received: by yhfq46 with SMTP id q46so638291yhf.7 for ; Thu, 31 May 2012 05:38:36 -0700 (PDT) From: Victor Goldenshtein To: Cc: Subject: [PATCH v3] mac80211: add command to get current rssi Date: Thu, 31 May 2012 15:35:55 +0300 Message-Id: <1338467755-8331-1-git-send-email-victorg@ti.com> (sfid-20120531_143842_708716_4A172537) Sender: linux-wireless-owner@vger.kernel.org List-ID: Get current rssi (in dBm) from the driver/FW. Instead of reporting the signal received in the last rx packet, which might be inaccurate if rx traffic is low and beacon filtering is enabled, get the singal from the driver/FW. Signed-off-by: Victor Goldenshtein --- v3: fixed indentation in sta_set_sinfo(). updated documentation of the get_rssi(). include/net/mac80211.h | 5 +++++ net/mac80211/cfg.c | 21 +++++++++++++-------- net/mac80211/driver-ops.h | 16 ++++++++++++++++ net/mac80211/driver-trace.h | 6 ++++++ 4 files changed, 40 insertions(+), 8 deletions(-) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 4d6e6c6..efee816 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -2231,6 +2231,9 @@ enum ieee80211_rate_control_changed { * @get_et_strings: Ethtool API to get a set of strings to describe stats * and perhaps other supported types of ethtool data-sets. * + * @get_rssi: Get current signal strength in dBm, the function is optional + * and can sleep. + * */ struct ieee80211_ops { void (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb); @@ -2370,6 +2373,8 @@ struct ieee80211_ops { void (*get_et_strings)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u32 sset, u8 *data); + int (*get_rssi)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, + struct ieee80211_sta *sta, s8 *rssi_dbm); }; /** diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 0221270..c8516aa 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -353,6 +353,7 @@ void sta_set_rate_info_tx(struct sta_info *sta, static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) { struct ieee80211_sub_if_data *sdata = sta->sdata; + struct ieee80211_local *local = sdata->local; struct timespec uptime; sinfo->generation = sdata->local->sta_generation; @@ -388,7 +389,9 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) || (sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) { sinfo->filled |= STATION_INFO_SIGNAL | STATION_INFO_SIGNAL_AVG; - sinfo->signal = (s8)sta->last_signal; + if (!local->ops->get_rssi || + drv_get_rssi(local, sdata, &sta->sta, &sinfo->signal)) + sinfo->signal = (s8)sta->last_signal; sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal); } @@ -517,7 +520,7 @@ static void ieee80211_get_et_stats(struct wiphy *wiphy, * network device. */ - rcu_read_lock(); + mutex_lock(&local->sta_mtx); if (sdata->vif.type == NL80211_IFTYPE_STATION) { sta = sta_info_get_bss(sdata, sdata->u.mgd.bssid); @@ -546,7 +549,7 @@ static void ieee80211_get_et_stats(struct wiphy *wiphy, data[i] = (u8)sinfo.signal_avg; i++; } else { - list_for_each_entry_rcu(sta, &local->sta_list, list) { + list_for_each_entry(sta, &local->sta_list, list) { /* Make sure this station belongs to the proper dev */ if (sta->sdata->dev != dev) continue; @@ -603,7 +606,7 @@ do_survey: else data[i++] = -1LL; - rcu_read_unlock(); + mutex_unlock(&local->sta_mtx); if (WARN_ON(i != STA_STATS_LEN)) return; @@ -629,10 +632,11 @@ static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev, int idx, u8 *mac, struct station_info *sinfo) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = sdata->local; struct sta_info *sta; int ret = -ENOENT; - rcu_read_lock(); + mutex_lock(&local->sta_mtx); sta = sta_info_get_by_idx(sdata, idx); if (sta) { @@ -641,7 +645,7 @@ static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev, sta_set_sinfo(sta, sinfo); } - rcu_read_unlock(); + mutex_unlock(&local->sta_mtx); return ret; } @@ -658,10 +662,11 @@ static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev, u8 *mac, struct station_info *sinfo) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = sdata->local; struct sta_info *sta; int ret = -ENOENT; - rcu_read_lock(); + mutex_lock(&local->sta_mtx); sta = sta_info_get_bss(sdata, mac); if (sta) { @@ -669,7 +674,7 @@ static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev, sta_set_sinfo(sta, sinfo); } - rcu_read_unlock(); + mutex_unlock(&local->sta_mtx); return ret; } diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h index 6d33a0c..370c721 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -845,4 +845,20 @@ drv_allow_buffered_frames(struct ieee80211_local *local, more_data); trace_drv_return_void(local); } + +static inline int drv_get_rssi(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + struct ieee80211_sta *sta, + s8 *rssi_dbm) +{ + int ret; + + might_sleep(); + + trace_drv_get_rssi(local, sdata); + ret = local->ops->get_rssi(&local->hw, &sdata->vif, sta, rssi_dbm); + trace_drv_return_int(local, ret); + + return ret; +} #endif /* __MAC80211_DRIVER_OPS */ diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h index 6de00b2..fc91ac4 100644 --- a/net/mac80211/driver-trace.h +++ b/net/mac80211/driver-trace.h @@ -1218,6 +1218,12 @@ DEFINE_EVENT(release_evt, drv_allow_buffered_frames, TP_ARGS(local, sta, tids, num_frames, reason, more_data) ); +DEFINE_EVENT(local_sdata_evt, drv_get_rssi, + TP_PROTO(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata), + TP_ARGS(local, sdata) +); + /* * Tracing for API calls that drivers call. */ -- 1.7.5.4