nl80211: Add signal strength and bandwith to nl80211station info

This patch adds signal strength and transmission bitrate
to the station_info of nl80211.

Signed-off-by: Henning Rogge <rogge@fgan.de>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 81 insertions, 2 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 7912eb14eca0..23b5eeaf7bc5 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -310,12 +310,35 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 
         sinfo->filled = STATION_INFO_INACTIVE_TIME |
                         STATION_INFO_RX_BYTES |
-                        STATION_INFO_TX_BYTES;
+                        STATION_INFO_TX_BYTES |
+                        STATION_INFO_TX_BITRATE;
 
         sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
         sinfo->rx_bytes = sta->rx_bytes;
         sinfo->tx_bytes = sta->tx_bytes;
 
+        if (sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
+                sinfo->filled |= STATION_INFO_SIGNAL;
+                sinfo->signal = (s8)sta->last_signal;
+        }
+
+        sinfo->txrate.flags = 0;
+        if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
+                sinfo->txrate.flags |= RATE_INFO_FLAGS_MCS;
+        if (sta->last_tx_rate.flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+                sinfo->txrate.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
+        if (sta->last_tx_rate.flags & IEEE80211_TX_RC_SHORT_GI)
+                sinfo->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
+
+        if (!(sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)) {
+                struct ieee80211_supported_band *sband;
+                sband = sta->local->hw.wiphy->bands[
+                                sta->local->hw.conf.channel->band];
+                sinfo->txrate.legacy =
+                        sband->bitrates[sta->last_tx_rate.idx].bitrate;
+        } else
+                sinfo->txrate.mcs = sta->last_tx_rate.idx;
+
         if (ieee80211_vif_is_mesh(&sdata->vif)) {
 #ifdef CONFIG_MAC80211_MESH
                 sinfo->filled |= STATION_INFO_LLID |
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4335f76be71f..93c9b983ce08 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1091,12 +1091,46 @@ static int parse_station_flags(struct nlattr *nla, u32 *staflags)
         return 0;
 }
 
+static u16 nl80211_calculate_bitrate(struct rate_info *rate)
+{
+        int modulation, streams, bitrate;
+
+        if (!(rate->flags & RATE_INFO_FLAGS_MCS))
+                return rate->legacy;
+
+        /* the formula below does only work for MCS values smaller than 32 */
+        if (rate->mcs >= 32)
+                return 0;
+
+        modulation = rate->mcs & 7;
+        streams = (rate->mcs >> 3) + 1;
+
+        bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
+                        13500000 : 6500000;
+
+        if (modulation < 4)
+                bitrate *= (modulation + 1);
+        else if (modulation == 4)
+                bitrate *= (modulation + 2);
+        else
+                bitrate *= (modulation + 3);
+
+        bitrate *= streams;
+
+        if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
+                bitrate = (bitrate / 9) * 10;
+
+        /* do NOT round down here */
+        return (bitrate + 50000) / 100000;
+}
+
 static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
                                 int flags, struct net_device *dev,
                                 u8 *mac_addr, struct station_info *sinfo)
 {
         void *hdr;
-        struct nlattr *sinfoattr;
+        struct nlattr *sinfoattr, *txrate;
+        u16 bitrate;
 
         hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_STATION);
         if (!hdr)
@@ -1126,7 +1160,29 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
         if (sinfo->filled & STATION_INFO_PLINK_STATE)
                 NLA_PUT_U8(msg, NL80211_STA_INFO_PLINK_STATE,
                             sinfo->plink_state);
+        if (sinfo->filled & STATION_INFO_SIGNAL)
+                NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL,
+                           sinfo->signal);
+        if (sinfo->filled & STATION_INFO_TX_BITRATE) {
+                txrate = nla_nest_start(msg, NL80211_STA_INFO_TX_BITRATE);
+                if (!txrate)
+                        goto nla_put_failure;
+
+                /* nl80211_calculate_bitrate will return 0 for mcs >= 32 */
+                bitrate = nl80211_calculate_bitrate(&sinfo->txrate);
+                if (bitrate > 0)
+                        NLA_PUT_U16(msg, NL80211_RATE_INFO_BITRATE, bitrate);
 
+                if (sinfo->txrate.flags & RATE_INFO_FLAGS_MCS)
+                        NLA_PUT_U8(msg, NL80211_RATE_INFO_MCS,
+                                    sinfo->txrate.mcs);
+                if (sinfo->txrate.flags & RATE_INFO_FLAGS_40_MHZ_WIDTH)
+                        NLA_PUT_FLAG(msg, NL80211_RATE_INFO_40_MHZ_WIDTH);
+                if (sinfo->txrate.flags & RATE_INFO_FLAGS_SHORT_GI)
+                        NLA_PUT_FLAG(msg, NL80211_RATE_INFO_SHORT_GI);
+
+                nla_nest_end(msg, txrate);
+        }
         nla_nest_end(msg, sinfoattr);
 
         return genlmsg_end(msg, hdr);