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wireless: implement basic rate helper function

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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>
This commit is contained in:
Johannes Berg 2008-10-29 20:00:45 +01:00 committed by John W. Linville
parent 743b97caf9
commit bd81525272
2 changed files with 35 additions and 0 deletions
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16
include/net/wireless.h
View File

@ -340,6 +340,22 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq)
return __ieee80211_get_channel(wiphy, 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 * regulatory_hint - driver hint to the wireless core a regulatory domain
* @wiphy: the wireless device giving the hint (used only for reporting * @wiphy: the wireless device giving the hint (used only for reporting

19
net/wireless/util.c
View File

@ -7,6 +7,25 @@
#include <asm/bitops.h> #include <asm/bitops.h>
#include "core.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) int ieee80211_channel_to_frequency(int chan)
{ {
if (chan < 14) if (chan < 14)