iwlwifi: add support for device tx flush request

"Flush" request can come from two different sources, it can either from
mac80211, or from device when the operation is needed. Here
adding the support for device issue "flush" request.

When receive tx complete with status is TX_STATUS_FAIL_RFKILL_FLUSH,
issue REPLY_TXFIFO_FLUSH command to uCode to flush out all the tx frames
in queues.

In this condition, since mac80211 has no knowledge of "flush" operation,
driver need to stop all the tx queues and wait for the operation
completed before wake up the queues for frames transmission.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index c735a39ec17..60af54210f9 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -859,6 +859,24 @@ int iwl_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src)
 	return 0;
 }
 
+static void iwl_bg_tx_flush(struct work_struct *work)
+{
+	struct iwl_priv *priv =
+		container_of(work, struct iwl_priv, tx_flush);
+
+	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+		return;
+
+	/* do nothing if rf-kill is on */
+	if (!iwl_is_ready_rf(priv))
+		return;
+
+	if (priv->cfg->ops->lib->txfifo_flush) {
+		IWL_DEBUG_INFO(priv, "device request: flush all tx frames\n");
+		iwlagn_dev_txfifo_flush(priv, IWL_DROP_ALL);
+	}
+}
+
 /**
  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
  *
@@ -3693,6 +3711,7 @@ static void iwl_setup_deferred_work(struct iwl_priv *priv)
 	INIT_WORK(&priv->rx_replenish, iwl_bg_rx_replenish);
 	INIT_WORK(&priv->beacon_update, iwl_bg_beacon_update);
 	INIT_WORK(&priv->run_time_calib_work, iwl_bg_run_time_calib_work);
+	INIT_WORK(&priv->tx_flush, iwl_bg_tx_flush);
 	INIT_DELAYED_WORK(&priv->init_alive_start, iwl_bg_init_alive_start);
 	INIT_DELAYED_WORK(&priv->alive_start, iwl_bg_alive_start);