wireless: implement basic rate helper function
authorJohannes Berg <johannes@sipsolutions.net>
Wed, 29 Oct 2008 19:00:45 +0000 (20:00 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Mon, 10 Nov 2008 20:17:35 +0000 (15:17 -0500)
This adds a helper function that, given a bitmap of basic
rates and a bitrate returns the response rate for this rate.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
include/net/wireless.h
net/wireless/util.c

index 41294c5f6f8ffc9a7db3b046dc191c738bae4528..17d4b582cf346a9370dbbb1fb99c37173e33c69a 100644 (file)
@@ -340,6 +340,22 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq)
        return __ieee80211_get_channel(wiphy, freq);
 }
 
+/**
+ * ieee80211_get_response_rate - get basic rate for a given rate
+ *
+ * @sband: the band to look for rates in
+ * @basic_rates: bitmap of basic rates
+ * @bitrate: the bitrate for which to find the basic rate
+ *
+ * This function returns the basic rate corresponding to a given
+ * bitrate, that is the next lower bitrate contained in the basic
+ * rate map, which is, for this function, given as a bitmap of
+ * indices of rates in the band's bitrate table.
+ */
+struct ieee80211_rate *
+ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
+                           u64 basic_rates, int bitrate);
+
 /**
  * regulatory_hint - driver hint to the wireless core a regulatory domain
  * @wiphy: the wireless device giving the hint (used only for reporting
index f54424693a38a378bd5e7cdc25326907b5fbb983..e76cc28b034557fc1dfcadbae21a09307f6fee5c 100644 (file)
@@ -7,6 +7,25 @@
 #include <asm/bitops.h>
 #include "core.h"
 
+struct ieee80211_rate *
+ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
+                           u64 basic_rates, int bitrate)
+{
+       struct ieee80211_rate *result = &sband->bitrates[0];
+       int i;
+
+       for (i = 0; i < sband->n_bitrates; i++) {
+               if (!(basic_rates & BIT(i)))
+                       continue;
+               if (sband->bitrates[i].bitrate > bitrate)
+                       continue;
+               result = &sband->bitrates[i];
+       }
+
+       return result;
+}
+EXPORT_SYMBOL(ieee80211_get_response_rate);
+
 int ieee80211_channel_to_frequency(int chan)
 {
        if (chan < 14)