rtw88: Add update beacon flow for AP mode

To support stations in power saving mode, AP should notify stations
that there are frames buffered at the AP via TIM during beacons.
Driver used to transmit identical beacons that were downloaded to
hardware during the initiation phase. This beacon will become
obsolete over time.

If the beacon does not contain sufficient information, station would
not be able to percept that there is data to receive. Hence it won't
wake up and start the PS-poll procedure, this could lead to timeout
and/or lost data segments. In order to resolve this issue, driver will
now download beacon to hardware whenever the content is updated.

Enable hardware to update dtim_count for more efficiency, this reduces
the overhead of downloading beacon at every beacon interval since most
of the time only the dtim_count needs to be updated.

Change queue mapping for broadcast/multicast frames to high queue, so
these frames can be prioritized and sent when dtim_count is zero.
Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220407095858.46807-4-pkshih@realtek.com

drivers/net/wireless/realtek/rtw88/fw.c

@@ -1047,6 +1047,7 @@ static struct sk_buff *rtw_get_rsvd_page_skb(struct ieee80211_hw *hw,
 	struct rtw_vif *rtwvif;
 	struct sk_buff *skb_new;
 	struct cfg80211_ssid *ssid;
+	u16 tim_offset;
 
 	if (rsvd_pkt->type == RSVD_DUMMY) {
 		skb_new = alloc_skb(1, GFP_KERNEL);
@@ -1065,7 +1066,8 @@ static struct sk_buff *rtw_get_rsvd_page_skb(struct ieee80211_hw *hw,
 
 	switch (rsvd_pkt->type) {
 	case RSVD_BEACON:
-		skb_new = ieee80211_beacon_get(hw, vif);
+		skb_new = ieee80211_beacon_get_tim(hw, vif, &tim_offset, NULL);
+		rsvd_pkt->tim_offset = tim_offset;
 		break;
 	case RSVD_PS_POLL:
 		skb_new = ieee80211_pspoll_get(hw, vif);

drivers/net/wireless/realtek/rtw88/fw.h

@@ -172,6 +172,7 @@ struct rtw_rsvd_page {
 	struct sk_buff *skb;
 	enum rtw_rsvd_packet_type type;
 	u8 page;
+	u16 tim_offset;
 	bool add_txdesc;
 	struct cfg80211_ssid *ssid;
 	u16 probe_req_size;

drivers/net/wireless/realtek/rtw88/mac80211.c

@@ -402,8 +402,10 @@ static void rtw_ops_bss_info_changed(struct ieee80211_hw *hw,
 			coex_stat->wl_beacon_interval = conf->beacon_int;
 	}
 
-	if (changed & BSS_CHANGED_BEACON)
+	if (changed & BSS_CHANGED_BEACON) {
+		rtw_set_dtim_period(rtwdev, conf->dtim_period);
 		rtw_fw_download_rsvd_page(rtwdev);
+	}
 
 	if (changed & BSS_CHANGED_BEACON_ENABLED) {
 		if (conf->enable_beacon)
@@ -474,6 +476,18 @@ static int rtw_ops_sta_remove(struct ieee80211_hw *hw,
 	return 0;
 }
 
+static int rtw_ops_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
+			   bool set)
+{
+	struct rtw_dev *rtwdev = hw->priv;
+
+	mutex_lock(&rtwdev->mutex);
+	rtw_fw_download_rsvd_page(rtwdev);
+	mutex_unlock(&rtwdev->mutex);
+
+	return 0;
+}
+
 static int rtw_ops_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 			   struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 			   struct ieee80211_key_conf *key)
@@ -875,6 +889,7 @@ const struct ieee80211_ops rtw_ops = {
 	.conf_tx		= rtw_ops_conf_tx,
 	.sta_add		= rtw_ops_sta_add,
 	.sta_remove		= rtw_ops_sta_remove,
+	.set_tim		= rtw_ops_set_tim,
 	.set_key		= rtw_ops_set_key,
 	.ampdu_action		= rtw_ops_ampdu_action,
 	.can_aggregate_in_amsdu	= rtw_ops_can_aggregate_in_amsdu,

drivers/net/wireless/realtek/rtw88/main.c

@@ -664,6 +664,12 @@ void rtw_set_rx_freq_band(struct rtw_rx_pkt_stat *pkt_stat, u8 channel)
 }
 EXPORT_SYMBOL(rtw_set_rx_freq_band);
 
+void rtw_set_dtim_period(struct rtw_dev *rtwdev, int dtim_period)
+{
+	rtw_write32_set(rtwdev, REG_TCR, BIT_TCR_UPDATE_TIMIE);
+	rtw_write8(rtwdev, REG_DTIM_COUNTER_ROOT, dtim_period - 1);
+}
+
 void rtw_get_channel_params(struct cfg80211_chan_def *chandef,
 			    struct rtw_channel_params *chan_params)
 {

drivers/net/wireless/realtek/rtw88/main.h

@@ -580,6 +580,7 @@ struct rtw_tx_pkt_info {
 	u32 tx_pkt_size;
 	u8 offset;
 	u8 pkt_offset;
+	u8 tim_offset;
 	u8 mac_id;
 	u8 rate_id;
 	u8 rate;
@@ -2131,6 +2132,7 @@ static inline int rtw_chip_dump_fw_crash(struct rtw_dev *rtwdev)
 }
 
 void rtw_set_rx_freq_band(struct rtw_rx_pkt_stat *pkt_stat, u8 channel);
+void rtw_set_dtim_period(struct rtw_dev *rtwdev, int dtim_period);
 void rtw_get_channel_params(struct cfg80211_chan_def *chandef,
 			    struct rtw_channel_params *ch_param);
 bool check_hw_ready(struct rtw_dev *rtwdev, u32 addr, u32 mask, u32 target);

drivers/net/wireless/realtek/rtw88/pci.c

@@ -689,6 +689,9 @@ static u8 rtw_hw_queue_mapping(struct sk_buff *skb)
 		queue = RTW_TX_QUEUE_BCN;
 	else if (unlikely(ieee80211_is_mgmt(fc) || ieee80211_is_ctl(fc)))
 		queue = RTW_TX_QUEUE_MGMT;
+	else if (is_broadcast_ether_addr(hdr->addr1) ||
+		 is_multicast_ether_addr(hdr->addr1))
+		queue = RTW_TX_QUEUE_HI0;
 	else if (WARN_ON_ONCE(q_mapping >= ARRAY_SIZE(ac_to_hwq)))
 		queue = ac_to_hwq[IEEE80211_AC_BE];
 	else

drivers/net/wireless/realtek/rtw88/reg.h

@@ -389,12 +389,14 @@
 #define BIT_EN_FREE_CNT		BIT(3)
 #define BIT_DIS_SECOND_CCA	(BIT(0) | BIT(1))
 #define REG_HIQ_NO_LMT_EN	0x5A7
+#define REG_DTIM_COUNTER_ROOT	0x5A8
 #define BIT_HIQ_NO_LMT_EN_ROOT	BIT(0)
 #define REG_TIMER0_SRC_SEL	0x05B4
 #define BIT_TSFT_SEL_TIMER0	(BIT(4) | BIT(5) | BIT(6))
 
 #define REG_TCR			0x0604
 #define BIT_PWRMGT_HWDATA_EN	BIT(7)
+#define BIT_TCR_UPDATE_TIMIE	BIT(5)
 #define REG_RCR			0x0608
 #define BIT_APP_FCS		BIT(31)
 #define BIT_APP_MIC		BIT(30)

drivers/net/wireless/realtek/rtw88/tx.c

@@ -67,6 +67,10 @@ void rtw_tx_fill_tx_desc(struct rtw_tx_pkt_info *pkt_info, struct sk_buff *skb)
 	SET_TX_DESC_HW_SSN_SEL(txdesc, pkt_info->hw_ssn_sel);
 	SET_TX_DESC_NAVUSEHDR(txdesc, pkt_info->nav_use_hdr);
 	SET_TX_DESC_BT_NULL(txdesc, pkt_info->bt_null);
+	if (pkt_info->tim_offset) {
+		SET_TX_DESC_TIM_EN(txdesc, 1);
+		SET_TX_DESC_TIM_OFFSET(txdesc, pkt_info->tim_offset);
+	}
 }
 EXPORT_SYMBOL(rtw_tx_fill_tx_desc);
 
@@ -448,6 +452,19 @@ void rtw_tx_rsvd_page_pkt_info_update(struct rtw_dev *rtwdev,
 	if (type == RSVD_QOS_NULL)
 		pkt_info->bt_null = true;
 
+	if (type == RSVD_BEACON) {
+		struct rtw_rsvd_page *rsvd_pkt;
+		int hdr_len;
+
+		rsvd_pkt = list_first_entry_or_null(&rtwdev->rsvd_page_list,
+						    struct rtw_rsvd_page,
+						    build_list);
+		if (rsvd_pkt && rsvd_pkt->tim_offset != 0) {
+			hdr_len = sizeof(struct ieee80211_hdr_3addr);
+			pkt_info->tim_offset = rsvd_pkt->tim_offset - hdr_len;
+		}
+	}
+
 	rtw_tx_pkt_info_update_sec(rtwdev, pkt_info, skb);
 
 	/* TODO: need to change hw port and hw ssn sel for multiple vifs */

drivers/net/wireless/realtek/rtw88/tx.h

@@ -33,6 +33,10 @@
 	le32p_replace_bits((__le32 *)(txdesc) + 0x05, value, GENMASK(6, 5))
 #define SET_TX_DESC_SW_SEQ(txdesc, value)                                      \
 	le32p_replace_bits((__le32 *)(txdesc) + 0x09, value, GENMASK(23, 12))
+#define SET_TX_DESC_TIM_EN(txdesc, value)                                      \
+	le32p_replace_bits((__le32 *)(txdesc) + 0x09, value, BIT(7))
+#define SET_TX_DESC_TIM_OFFSET(txdesc, value)                                  \
+	le32p_replace_bits((__le32 *)(txdesc) + 0x09, value, GENMASK(6, 0))
 #define SET_TX_DESC_MAX_AGG_NUM(txdesc, value)                                 \
 	le32p_replace_bits((__le32 *)(txdesc) + 0x03, value, GENMASK(21, 17))
 #define SET_TX_DESC_USE_RTS(tx_desc, value)                                    \