iwlwifi: mvm: Support CSA countdown offloading

Add support CSA countdown offloading. When CSA starts, the driver
specifies the offsets to the eCSA and CSA IEs in the beacon template
command and the fw performs the countdown.
The fw notifies the driver when the channel switch flow
should be performed.
Beacon sent notifications are not used anymore.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 55f114d24148..ddc400436782 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -431,6 +431,7 @@ static const struct iwl_hcmd_names iwl_mvm_system_names[] = {
 static const struct iwl_hcmd_names iwl_mvm_mac_conf_names[] = {
         HCMD_NAME(LINK_QUALITY_MEASUREMENT_CMD),
         HCMD_NAME(LINK_QUALITY_MEASUREMENT_COMPLETE_NOTIF),
+        HCMD_NAME(CHANNEL_SWITCH_NOA_NOTIF),
 };
 
 /* Please keep this array *SORTED* by hex value.
@@ -494,6 +495,29 @@ static u32 calc_min_backoff(struct iwl_trans *trans, const struct iwl_cfg *cfg)
 
 static void iwl_mvm_fw_error_dump_wk(struct work_struct *work);
 
+static void iwl_mvm_tx_unblock_dwork(struct work_struct *work)
+{
+        struct iwl_mvm *mvm =
+                container_of(work, struct iwl_mvm, cs_tx_unblock_dwork.work);
+        struct ieee80211_vif *tx_blocked_vif;
+        struct iwl_mvm_vif *mvmvif;
+
+        mutex_lock(&mvm->mutex);
+
+        tx_blocked_vif =
+                rcu_dereference_protected(mvm->csa_tx_blocked_vif,
+                                          lockdep_is_held(&mvm->mutex));
+
+        if (!tx_blocked_vif)
+                goto unlock;
+
+        mvmvif = iwl_mvm_vif_from_mac80211(tx_blocked_vif);
+        iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
+        RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
+unlock:
+        mutex_unlock(&mvm->mutex);
+}
+
 static struct iwl_op_mode *
 iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
                       const struct iwl_fw *fw, struct dentry *dbgfs_dir)
@@ -595,6 +619,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 
         SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);
 
+        INIT_DELAYED_WORK(&mvm->cs_tx_unblock_dwork, iwl_mvm_tx_unblock_dwork);
+
         /*
          * Populate the state variables that the transport layer needs
          * to know about.