mac80211: add ieee80211_vif_change_bandwidth

For HT and VHT the current bandwidth can change,
add the function ieee80211_vif_change_bandwidth()
to take care of this. It returns a failure if the
new bandwidth isn't compatible with the existing
channel context, the caller has to handle that.
When it happens, also inform the driver that the
bandwidth changed for this virtual interface (no
drivers would actually care today though.)

Changing to/from HT/VHT isn't allowed though.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index b7fb311e83f4..54e2add8429f 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -215,6 +215,9 @@ struct ieee80211_chanctx_conf {
  *      changed (currently only in P2P client mode, GO mode will be later)
  * @BSS_CHANGED_DTIM_PERIOD: the DTIM period value was changed (set when
  *      it becomes valid, managed mode only)
+ * @BSS_CHANGED_BANDWIDTH: The bandwidth used by this interface changed,
+ *      note that this is only called when it changes after the channel
+ *      context had been assigned.
  */
 enum ieee80211_bss_change {
         BSS_CHANGED_ASSOC               = 1<<0,
@@ -238,6 +241,7 @@ enum ieee80211_bss_change {
         BSS_CHANGED_TXPOWER             = 1<<18,
         BSS_CHANGED_P2P_PS              = 1<<19,
         BSS_CHANGED_DTIM_PERIOD         = 1<<20,
+        BSS_CHANGED_BANDWIDTH           = 1<<21,
 
         /* when adding here, make sure to change ieee80211_reconfig */
 };