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authorSimon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>2013-08-28 15:41:29 +0400
committerJohannes Berg <johannes.berg@intel.com>2013-09-26 15:27:13 +0400
commite6b7cde4d3e155f118b81f1f62f86554c529083a (patch)
treef7d4b6a41f03d286feb3b1daab02d2e8c8c92bc3 /net/mac80211/util.c
parent774f073461dbee0decee7524d9b930a98a3dc30c (diff)
downloadlinux-e6b7cde4d3e155f118b81f1f62f86554c529083a.tar.xz
mac80211: split off channel switch parsing function
The channel switch parsing function can be re-used for the IBSS code, put the common part into an extra function. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> [also move/rename chandef_downgrade] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/util.c')
-rw-r--r--net/mac80211/util.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 75a16853fb45..3c8283b9b45a 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2292,3 +2292,63 @@ void ieee80211_radar_detected(struct ieee80211_hw *hw)
ieee80211_queue_work(hw, &local->radar_detected_work);
}
EXPORT_SYMBOL(ieee80211_radar_detected);
+
+u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
+{
+ u32 ret;
+ int tmp;
+
+ switch (c->width) {
+ case NL80211_CHAN_WIDTH_20:
+ c->width = NL80211_CHAN_WIDTH_20_NOHT;
+ ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
+ break;
+ case NL80211_CHAN_WIDTH_40:
+ c->width = NL80211_CHAN_WIDTH_20;
+ c->center_freq1 = c->chan->center_freq;
+ ret = IEEE80211_STA_DISABLE_40MHZ |
+ IEEE80211_STA_DISABLE_VHT;
+ break;
+ case NL80211_CHAN_WIDTH_80:
+ tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
+ /* n_P40 */
+ tmp /= 2;
+ /* freq_P40 */
+ c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
+ c->width = NL80211_CHAN_WIDTH_40;
+ ret = IEEE80211_STA_DISABLE_VHT;
+ break;
+ case NL80211_CHAN_WIDTH_80P80:
+ c->center_freq2 = 0;
+ c->width = NL80211_CHAN_WIDTH_80;
+ ret = IEEE80211_STA_DISABLE_80P80MHZ |
+ IEEE80211_STA_DISABLE_160MHZ;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ /* n_P20 */
+ tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
+ /* n_P80 */
+ tmp /= 4;
+ c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
+ c->width = NL80211_CHAN_WIDTH_80;
+ ret = IEEE80211_STA_DISABLE_80P80MHZ |
+ IEEE80211_STA_DISABLE_160MHZ;
+ break;
+ default:
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ WARN_ON_ONCE(1);
+ c->width = NL80211_CHAN_WIDTH_20_NOHT;
+ ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
+ break;
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ WARN_ON_ONCE(1);
+ /* keep c->width */
+ ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
+ break;
+ }
+
+ WARN_ON_ONCE(!cfg80211_chandef_valid(c));
+
+ return ret;
+}