wifi: rtlwifi: rtl8192cu: Fix TX aggregation

rtl8192cu is checking rtl_mac.tids when deciding if it should enable
aggregation. This is wrong because rtl_mac.tids is not initialised
anywhere. Check rtl_sta_info.tids instead, which is initialised.

Also, when enabling aggregation also enable RTS. The vendor driver does
this, my router does this. It seems like the thing to do.

Also also, it seems right to set the AMPDU density only when enabling
aggregation.

Also also also, delete the unused member rtl_mac.tids and the unused
macros RTL_AGG_ON and RTL_AGG_OFF.

Naturally, with working AMPDU the download/upload speeds are better.
Before: 59/32 Mbps.
After:  68/46 Mbps.
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/4e936334-5f81-403f-a495-0628ebfb6903@gmail.com

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -482,8 +482,9 @@ void rtl92cu_tx_fill_desc(struct ieee80211_hw *hw,
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
 	struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
-	u8 *qc = ieee80211_get_qos_ctl(hdr);
-	u8 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
+	struct rtl_sta_info *sta_entry;
+	u8 agg_state = RTL_AGG_STOP;
+	u8 ampdu_density = 0;
 	u16 seq_number;
 	__le16 fc = hdr->frame_control;
 	u8 rate_flag = info->control.rates[0].flags;
@@ -492,6 +493,7 @@ void rtl92cu_tx_fill_desc(struct ieee80211_hw *hw,
 						skb_get_queue_mapping(skb));
 	u8 *txdesc8;
 	__le32 *txdesc;
+	u8 tid;
 
 	seq_number = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 	rtl_get_tcb_desc(hw, info, sta, skb, tcb_desc);
@@ -505,10 +507,21 @@ void rtl92cu_tx_fill_desc(struct ieee80211_hw *hw,
 	set_tx_desc_tx_rate(txdesc, tcb_desc->hw_rate);
 	if (tcb_desc->use_shortgi || tcb_desc->use_shortpreamble)
 		set_tx_desc_data_shortgi(txdesc, 1);
-	if (mac->tids[tid].agg.agg_state == RTL_AGG_ON &&
-		    info->flags & IEEE80211_TX_CTL_AMPDU) {
+
+	if (sta) {
+		sta_entry = (struct rtl_sta_info *)sta->drv_priv;
+		tid = ieee80211_get_tid(hdr);
+		agg_state = sta_entry->tids[tid].agg.agg_state;
+		ampdu_density = sta->deflink.ht_cap.ampdu_density;
+	}
+
+	if (agg_state == RTL_AGG_OPERATIONAL &&
+	    info->flags & IEEE80211_TX_CTL_AMPDU) {
 		set_tx_desc_agg_enable(txdesc, 1);
 		set_tx_desc_max_agg_num(txdesc, 0x14);
+		set_tx_desc_ampdu_density(txdesc, ampdu_density);
+		tcb_desc->rts_enable = 1;
+		tcb_desc->rts_rate = DESC_RATE24M;
 	} else {
 		set_tx_desc_agg_break(txdesc, 1);
 	}
@@ -543,14 +556,6 @@ void rtl92cu_tx_fill_desc(struct ieee80211_hw *hw,
 		set_tx_desc_data_bw(txdesc, 0);
 		set_tx_desc_data_sc(txdesc, 0);
 	}
-	rcu_read_lock();
-	sta = ieee80211_find_sta(mac->vif, mac->bssid);
-	if (sta) {
-		u8 ampdu_density = sta->deflink.ht_cap.ampdu_density;
-
-		set_tx_desc_ampdu_density(txdesc, ampdu_density);
-	}
-	rcu_read_unlock();
 	if (info->control.hw_key) {
 		struct ieee80211_key_conf *keyconf = info->control.hw_key;
 

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.h

@@ -10,8 +10,6 @@
 #define RTL92C_SIZE_MAX_RX_BUFFER		15360   /* 8192 */
 #define RX_DRV_INFO_SIZE_UNIT			8
 
-#define RTL_AGG_ON				1
-
 enum usb_rx_agg_mode {
 	USB_RX_AGG_DISABLE,
 	USB_RX_AGG_DMA,

drivers/net/wireless/realtek/rtlwifi/wifi.h

@@ -1397,8 +1397,6 @@ struct rtl_phy {
 #define RTL_AGG_PROGRESS			1
 #define RTL_AGG_START				2
 #define RTL_AGG_OPERATIONAL			3
-#define RTL_AGG_OFF				0
-#define RTL_AGG_ON				1
 #define RTL_RX_AGG_START			1
 #define RTL_RX_AGG_STOP				0
 #define RTL_AGG_EMPTYING_HW_QUEUE_ADDBA		2
@@ -1473,7 +1471,6 @@ struct rtl_mac {
 	enum nl80211_iftype opmode;
 
 	/*Probe Beacon management */
-	struct rtl_tid_data tids[MAX_TID_COUNT];
 	enum rtl_link_state link_state;
 
 	int n_channels;