iwlagn: Support flush queues for specified interface

Flush command can target specified interface or all interfaces
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

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

@@ -1530,10 +1530,12 @@ int iwlagn_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
 	might_sleep();
 
 	memset(&flush_cmd, 0, sizeof(flush_cmd));
+	if (flush_control & BIT(IWL_RXON_CTX_BSS))
 		flush_cmd.fifo_control = IWL_SCD_VO_MSK | IWL_SCD_VI_MSK |
 				 IWL_SCD_BE_MSK | IWL_SCD_BK_MSK |
 				 IWL_SCD_MGMT_MSK;
-	if (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS))
+	if ((flush_control & BIT(IWL_RXON_CTX_PAN)) &&
+	    (priv->valid_contexts != BIT(IWL_RXON_CTX_BSS)))
 		flush_cmd.fifo_control |= IWL_PAN_SCD_VO_MSK |
 				IWL_PAN_SCD_VI_MSK | IWL_PAN_SCD_BE_MSK |
 				IWL_PAN_SCD_BK_MSK | IWL_PAN_SCD_MGMT_MSK |

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

@@ -991,8 +991,7 @@ struct iwl_rem_sta_cmd {
 #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
+#define IWL_DROP_ALL		(BIT(IWL_RXON_CTX_BSS) | BIT(IWL_RXON_CTX_PAN))
 
 /*
  * REPLY_TXFIFO_FLUSH = 0x1e(command and response)