iwlwifi: mvm: Reflect GO channel switch in NoA

According to the spec, GO/AP should perform the channel switch just
before "beacon 0". However, since the exact timing isn't defined,
it may result in a sudden GO disappearance from the channel.
Prevent potential packet loss when performing the CS by scheduling
NoA time event and executing the channel switch flow when a notification
from fw is received.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/time-event.h b/drivers/net/wireless/iwlwifi/mvm/time-event.h
index 4a61c8c02372..2f48a90d4ad3 100644
--- a/drivers/net/wireless/iwlwifi/mvm/time-event.h
+++ b/drivers/net/wireless/iwlwifi/mvm/time-event.h
@@ -214,4 +214,33 @@ void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
 
 void iwl_mvm_roc_done_wk(struct work_struct *wk);
 
+/**
+ * iwl_mvm_schedule_csa_noa - request NoA for channel switch
+ * @mvm: the mvm component
+ * @vif: the virtual interface for which the channel switch is issued
+ * @duration: the duration of the NoA in TU.
+ * @apply_time: NoA start time in GP2.
+ *
+ * This function is used to schedule NoA time event and is used to perform
+ * the channel switch flow.
+ */
+int iwl_mvm_schedule_csa_noa(struct iwl_mvm *mvm,
+			     struct ieee80211_vif *vif,
+			     u32 duration, u32 apply_time);
+
+/**
+ * iwl_mvm_te_scheduled - check if the fw received the TE cmd
+ * @te_data: the time event data that corresponds to that time event
+ *
+ * This function returns true iff this TE is added to the fw.
+ */
+static inline bool
+iwl_mvm_te_scheduled(struct iwl_mvm_time_event_data *te_data)
+{
+	if (!te_data)
+		return false;
+
+	return !!te_data->uid;
+}
+
 #endif /* __time_event_h__ */