mac80211: introduce TDLS channel switch ops

Implement the cfg80211 TDLS channel switch ops and introduce new mac80211
ones for low-level drivers.
Verify low-level driver support for the new ops when using the relevant
wiphy feature bit. Also verify the peer supports channel switching before
passing the command down.

Add a new STA flag to track the off-channel state with the TDLS peer and
make sure to cancel the channel-switch if the peer STA is unexpectedly
removed.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 83232aa2f077..fdedceb7adcb 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2915,6 +2915,16 @@ enum ieee80211_reconfig_type {
  *
  * @get_txpower: get current maximum tx power (in dBm) based on configuration
  *      and hardware limits.
+ *
+ * @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver
+ *      is responsible for continually initiating channel-switching operations
+ *      and returning to the base channel for communication with the AP. The
+ *      driver receives a channel-switch request template and the location of
+ *      the switch-timing IE within the template as part of the invocation.
+ *      The template is valid only within the call, and the driver can
+ *      optionally copy the skb for further re-use.
+ * @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
+ *      peers must be on the base channel when the call completes.
  */
 struct ieee80211_ops {
         void (*tx)(struct ieee80211_hw *hw,
@@ -3126,6 +3136,15 @@ struct ieee80211_ops {
         u32 (*get_expected_throughput)(struct ieee80211_sta *sta);
         int (*get_txpower)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                            int *dbm);
+
+        int (*tdls_channel_switch)(struct ieee80211_hw *hw,
+                                   struct ieee80211_vif *vif,
+                                   struct ieee80211_sta *sta, u8 oper_class,
+                                   struct cfg80211_chan_def *chandef,
+                                   struct sk_buff *skb, u32 ch_sw_tm_ie);
+        void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,
+                                           struct ieee80211_vif *vif,
+                                           struct ieee80211_sta *sta);
 };
 
 /**