wireless: report reasonable bitrate for MCS rates through wext

Previously, cfg80211 had reported "0" for MCS (i.e. 802.11n) bitrates
through the wireless extensions interface.  However, nl80211 was
converting MCS rates into a reasonable bitrate number.  This patch moves
the nl80211 code to cfg80211 where it is now shared between both the
nl80211 interface and the wireless extensions interface.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 4ef3efc..35b7121 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -378,6 +378,8 @@ int rdev_set_freq(struct cfg80211_registered_device *rdev,
                  struct wireless_dev *for_wdev,
                  int freq, enum nl80211_channel_type channel_type);
 
+u16 cfg80211_calculate_bitrate(struct rate_info *rate);
+
 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
 #define CFG80211_DEV_WARN_ON(cond)     WARN_ON(cond)
 #else

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a602843..7cb0d64 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1637,39 +1637,6 @@ static int parse_station_flags(struct genl_info *info,
        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)
@@ -1716,8 +1683,8 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
                if (!txrate)
                        goto nla_put_failure;
 
-               /* nl80211_calculate_bitrate will return 0 for mcs >= 32 */
-               bitrate = nl80211_calculate_bitrate(&sinfo->txrate);
+               /* cfg80211_calculate_bitrate will return 0 for mcs >= 32 */
+               bitrate = cfg80211_calculate_bitrate(&sinfo->txrate);
                if (bitrate > 0)
                        NLA_PUT_U16(msg, NL80211_RATE_INFO_BITRATE, bitrate);
 

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 59361fd..a3c841a 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -720,3 +720,36 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 
        return err;
 }
+
+u16 cfg80211_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;
+}

diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 584eb48..2fa8de1 100644 (file)
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -1256,10 +1256,7 @@ int cfg80211_wext_giwrate(struct net_device *dev,
        if (!(sinfo.filled & STATION_INFO_TX_BITRATE))
                return -EOPNOTSUPP;
 
-       rate->value = 0;
-
-       if (!(sinfo.txrate.flags & RATE_INFO_FLAGS_MCS))
-               rate->value = 100000 * sinfo.txrate.legacy;
+       rate->value = 100000 * cfg80211_calculate_bitrate(&sinfo.txrate);
 
        return 0;
 }