wireless: implement basic rate helper function
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>
diff --git a/include/net/wireless.h b/include/net/wireless.h
index 41294c5..17d4b58 100644
--- a/include/net/wireless.h
+++ b/include/net/wireless.h
@@ -341,6 +341,22 @@
}
/**
+ * 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
* conflicts)
diff --git a/net/wireless/util.c b/net/wireless/util.c
index f544246..e76cc28 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -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)