diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index e1a4ac1..96fe3ed 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -31,6 +31,51 @@
 #define WLAN_STA_WME BIT(9)
 #define WLAN_STA_WDS BIT(27)
 
+#define STA_TID_NUM 16
+#define ADDBA_RESP_INTERVAL HZ
+
+#define HT_AGG_STATE_INITIATOR_SHIFT	(4)
+
+#define HT_AGG_STATE_REQ_STOP_BA_MSK	BIT(3)
+
+#define HT_AGG_STATE_IDLE		(0x0)
+#define HT_AGG_STATE_OPERATIONAL	(0x7)
+
+/**
+ * struct tid_ampdu_rx - TID aggregation information (Rx).
+ *
+ * @state: TID's state in session state machine.
+ * @dialog_token: dialog token for aggregation session
+ * @ssn: Starting Sequence Number expected to be aggregated.
+ * @buf_size: buffer size for incoming A-MPDUs
+ * @timeout: reset timer value.
+ * @head_seq_num: head sequence number in reordering buffer.
+ * @stored_mpdu_num: number of MPDUs in reordering buffer
+ * @reorder_buf: buffer to reorder incoming aggregated MPDUs
+ * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
+ */
+struct tid_ampdu_rx {
+	u8 state;
+	u8 dialog_token;
+	u16 ssn;
+	u16 buf_size;
+	u16 timeout;
+	u16 head_seq_num;
+	u16 stored_mpdu_num;
+	struct sk_buff **reorder_buf;
+	struct timer_list session_timer;
+};
+
+/**
+ * struct sta_ampdu_mlme - STA aggregation information.
+ *
+ * @tid_agg_info_rx: aggregation info for Rx per TID
+ * @ampdu_rx: for locking sections in aggregation Rx flow
+ */
+struct sta_ampdu_mlme {
+	struct tid_ampdu_rx tid_rx[STA_TID_NUM];
+	spinlock_t ampdu_rx;
+};
 
 struct sta_info {
 	struct kref kref;
@@ -101,6 +146,8 @@
 
 	struct ieee80211_ht_info ht_info; /* 802.11n HT capabilities
 					     of this STA */
+	struct sta_ampdu_mlme ampdu_mlme;
+	u8 timer_to_tid[STA_TID_NUM];	/* convert timer id to tid */
 
 #ifdef CONFIG_MAC80211_DEBUGFS
 	struct sta_info_debugfsdentries {