---

yaml
---
r: 203503
b: refs/heads/master
c: 716c74b
h: refs/heads/master
i:
  203501: 3139f3f
  203499: d2c2c96
  203495: eda98a1
  203487: af37da7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 947279eefb77f79015a79b032eb825a065ab035f
+refs/heads/master: 716c74b00717ad9caedb4a46059fb64a3da99808

trunk/drivers/net/wireless/iwlwifi/iwl-1000.c

@@ -226,6 +226,7 @@ static struct iwl_lib_ops iwl1000_lib = {
 	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl_good_plcp_health,
 	.check_ack_health = iwl_good_ack_health,
+	.txfifo_flush = iwlagn_txfifo_flush,
 };
 
 static const struct iwl_ops iwl1000_ops = {

trunk/drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -402,6 +402,7 @@ static struct iwl_lib_ops iwl5000_lib = {
 	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl_good_plcp_health,
 	.check_ack_health = iwl_good_ack_health,
+	.txfifo_flush = iwlagn_txfifo_flush,
 };
 
 static struct iwl_lib_ops iwl5150_lib = {
@@ -465,6 +466,7 @@ static struct iwl_lib_ops iwl5150_lib = {
 	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl_good_plcp_health,
 	.check_ack_health = iwl_good_ack_health,
+	.txfifo_flush = iwlagn_txfifo_flush,
 };
 
 static const struct iwl_ops iwl5000_ops = {

trunk/drivers/net/wireless/iwlwifi/iwl-6000.c

@@ -327,6 +327,7 @@ static struct iwl_lib_ops iwl6000_lib = {
 	.recover_from_tx_stall = iwl_bg_monitor_recover,
 	.check_plcp_health = iwl_good_plcp_health,
 	.check_ack_health = iwl_good_ack_health,
+	.txfifo_flush = iwlagn_txfifo_flush,
 };
 
 static const struct iwl_ops iwl6000_ops = {

trunk/drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -1435,3 +1435,66 @@ void iwl_free_tfds_in_queue(struct iwl_priv *priv,
 		priv->stations[sta_id].tid[tid].tfds_in_queue = 0;
 	}
 }
+
+#define IWL_FLUSH_WAIT_MS	2000
+
+int iwlagn_wait_tx_queue_empty(struct iwl_priv *priv)
+{
+	struct iwl_tx_queue *txq;
+	struct iwl_queue *q;
+	int cnt;
+	unsigned long now = jiffies;
+	int ret = 0;
+
+	/* waiting for all the tx frames complete might take a while */
+	for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
+		if (cnt == IWL_CMD_QUEUE_NUM)
+			continue;
+		txq = &priv->txq[cnt];
+		q = &txq->q;
+		while (q->read_ptr != q->write_ptr && !time_after(jiffies,
+		       now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS)))
+				msleep(1);
+
+		if (q->read_ptr != q->write_ptr) {
+			IWL_ERR(priv, "fail to flush all tx fifo queues\n");
+			ret = -ETIMEDOUT;
+			break;
+		}
+	}
+	return ret;
+}
+
+#define IWL_TX_QUEUE_MSK	0xfffff
+
+/**
+ * iwlagn_txfifo_flush: send REPLY_TXFIFO_FLUSH command to uCode
+ *
+ * pre-requirements:
+ *  1. acquire mutex before calling
+ *  2. make sure rf is on and not in exit state
+ */
+int iwlagn_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
+{
+	struct iwl_txfifo_flush_cmd flush_cmd;
+	struct iwl_host_cmd cmd = {
+		.id = REPLY_TXFIFO_FLUSH,
+		.len = sizeof(struct iwl_txfifo_flush_cmd),
+		.flags = CMD_SYNC,
+		.data = &flush_cmd,
+	};
+
+	might_sleep();
+
+	memset(&flush_cmd, 0, sizeof(flush_cmd));
+	flush_cmd.fifo_control = IWL_TX_FIFO_VO_MSK | IWL_TX_FIFO_VI_MSK |
+				 IWL_TX_FIFO_BE_MSK | IWL_TX_FIFO_BK_MSK;
+	if (priv->cfg->sku & IWL_SKU_N)
+		flush_cmd.fifo_control |= IWL_AGG_TX_QUEUE_MSK;
+
+	IWL_DEBUG_INFO(priv, "fifo queue control: 0X%x\n",
+		       flush_cmd.fifo_control);
+	flush_cmd.flush_control = cpu_to_le16(flush_control);
+
+	return iwl_send_cmd(priv, &cmd);
+}

trunk/drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -3639,6 +3639,44 @@ static void iwl_mac_channel_switch(struct ieee80211_hw *hw,
 	IWL_DEBUG_MAC80211(priv, "leave\n");
 }
 
+static void iwl_mac_flush(struct ieee80211_hw *hw, bool drop)
+{
+	struct iwl_priv *priv = hw->priv;
+
+	mutex_lock(&priv->mutex);
+	IWL_DEBUG_MAC80211(priv, "enter\n");
+
+	/* do not support "flush" */
+	if (!priv->cfg->ops->lib->txfifo_flush)
+		goto done;
+
+	if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
+		IWL_DEBUG_TX(priv, "Aborting flush due to device shutdown\n");
+		goto done;
+	}
+	if (iwl_is_rfkill(priv)) {
+		IWL_DEBUG_TX(priv, "Aborting flush due to RF Kill\n");
+		goto done;
+	}
+
+	/*
+	 * mac80211 will not push any more frames for transmit
+	 * until the flush is completed
+	 */
+	if (drop) {
+		IWL_DEBUG_MAC80211(priv, "send flush command\n");
+		if (priv->cfg->ops->lib->txfifo_flush(priv, IWL_DROP_ALL)) {
+			IWL_ERR(priv, "flush request fail\n");
+			goto done;
+		}
+	}
+	IWL_DEBUG_MAC80211(priv, "wait transmit/flush all frames\n");
+	iwlagn_wait_tx_queue_empty(priv);
+done:
+	mutex_unlock(&priv->mutex);
+	IWL_DEBUG_MAC80211(priv, "leave\n");
+}
+
 /*****************************************************************************
  *
  * driver setup and teardown
@@ -3812,6 +3850,7 @@ static struct ieee80211_ops iwl_hw_ops = {
 	.sta_add = iwlagn_mac_sta_add,
 	.sta_remove = iwl_mac_sta_remove,
 	.channel_switch = iwl_mac_channel_switch,
+	.flush = iwl_mac_flush,
 };
 
 static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

trunk/drivers/net/wireless/iwlwifi/iwl-agn.h

@@ -147,6 +147,8 @@ const u8 *iwlagn_eeprom_query_addr(const struct iwl_priv *priv,
 void iwlagn_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq);
 int iwlagn_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq);
 int iwlagn_hw_nic_init(struct iwl_priv *priv);
+int iwlagn_wait_tx_queue_empty(struct iwl_priv *priv);
+int iwlagn_txfifo_flush(struct iwl_priv *priv, u16 flush_control);
 
 /* rx */
 void iwlagn_rx_queue_restock(struct iwl_priv *priv);

trunk/drivers/net/wireless/iwlwifi/iwl-commands.h

@@ -1216,6 +1216,10 @@ struct iwl_rem_sta_cmd {
 #define IWL_TX_FIFO_VO_MSK		cpu_to_le32(BIT(3))
 #define IWL_AGG_TX_QUEUE_MSK		cpu_to_le32(0xffc00)
 
+#define IWL_DROP_SINGLE		0
+#define IWL_DROP_SELECTED	1
+#define IWL_DROP_ALL		2
+
 /*
  * REPLY_TXFIFO_FLUSH = 0x1e(command and response)
  *

trunk/drivers/net/wireless/iwlwifi/iwl-core.h

@@ -205,6 +205,8 @@ struct iwl_lib_ops {
 	/* check for ack health */
 	bool (*check_ack_health)(struct iwl_priv *priv,
 					struct iwl_rx_packet *pkt);
+	int (*txfifo_flush)(struct iwl_priv *priv, u16 flush_control);
+
 	struct iwl_debugfs_ops debugfs_ops;
 };