iwlwifi: Set w-pointer upon resume according to SN

During D3 state, FW may send packets.
As a result, "write" queue pointer will be incremented by FW.
Upon resume from D3, driver should adjust its shadows of "write" and "read"
pointers to the value reported by FW.

1. Keep TID used during wowlan configuration.
2. Upon resume, set driver's "write" and "read" queue pointers
	to the value reported by FW.

Signed-off-by: Alex Malamud <alex.malamud@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-trans.h

@@ -562,6 +562,8 @@ struct iwl_trans_ops {
 	void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
 			struct sk_buff_head *skbs);
 
+	void (*set_q_ptrs)(struct iwl_trans *trans, int queue, int ptr);
+
 	bool (*txq_enable)(struct iwl_trans *trans, int queue, u16 ssn,
 			   const struct iwl_trans_txq_scd_cfg *cfg,
 			   unsigned int queue_wdg_timeout);
@@ -999,6 +1001,17 @@ static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
 	trans->ops->reclaim(trans, queue, ssn, skbs);
 }
 
+static inline void iwl_trans_set_q_ptrs(struct iwl_trans *trans, int queue,
+					int ptr)
+{
+	if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
+		IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
+		return;
+	}
+
+	trans->ops->set_q_ptrs(trans, queue, ptr);
+}
+
 static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue,
 					 bool configure_scd)
 {