wifi: rtw89: link rtw89_vif and chanctx stuffs

First, introduce struct rtw89_sub_entity for chanctx related stuffs.
Second, add enum rtw89_sub_entity_idx to rtw89_vif for vif operation
to access its/right chanctx stuffs after future multi-channel support.

Besides, RTW89_SUB_ENTITY_0 is the default chanctx entry throughout
driver, i.e. it's used for things which may not have a target chanctx
yet. So, we need to ensure that RTW89_SUB_ENTITY_0 is always working.
If there is at least one alive chanctx, then one of them must take
RTW89_SUB_ENTITY_0. If no alive chanctx, RTW89_SUB_ENTITY_0 will be
filled by rtw89_config_default_chandef().
Signed-off-by: Zong-Zhe Yang <kevin_yang@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/20221129083130.45708-7-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/chan.c

@@ -4,6 +4,7 @@
 
 #include "chan.h"
 #include "debug.h"
+#include "util.h"
 
 static enum rtw89_subband rtw89_get_subband_type(enum rtw89_band band,
 						 u8 center_chan)
@@ -108,8 +109,8 @@ bool rtw89_assign_entity_chan(struct rtw89_dev *rtwdev,
 			      const struct rtw89_chan *new)
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
-	struct rtw89_chan *chan = &hal->chan[idx];
-	struct rtw89_chan_rcd *rcd = &hal->chan_rcd[idx];
+	struct rtw89_chan *chan = &hal->sub[idx].chan;
+	struct rtw89_chan_rcd *rcd = &hal->sub[idx].rcd;
 	bool band_changed;
 
 	rcd->prev_primary_channel = chan->primary_channel;
@@ -127,7 +128,7 @@ static void __rtw89_config_entity_chandef(struct rtw89_dev *rtwdev,
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
 
-	hal->chandef[idx] = *chandef;
+	hal->sub[idx].chandef = *chandef;
 
 	if (from_stack)
 		set_bit(idx, hal->entity_map);
@@ -195,6 +196,7 @@ int rtw89_chanctx_ops_add(struct rtw89_dev *rtwdev,
 	rtw89_config_entity_chandef(rtwdev, idx, &ctx->def);
 	rtw89_set_channel(rtwdev);
 	cfg->idx = idx;
+	hal->sub[idx].cfg = cfg;
 	return 0;
 }
 
@@ -203,8 +205,34 @@ void rtw89_chanctx_ops_remove(struct rtw89_dev *rtwdev,
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
 	struct rtw89_chanctx_cfg *cfg = (struct rtw89_chanctx_cfg *)ctx->drv_priv;
+	struct rtw89_vif *rtwvif;
+	u8 drop, roll;
 
-	clear_bit(cfg->idx, hal->entity_map);
+	drop = cfg->idx;
+	if (drop != RTW89_SUB_ENTITY_0)
+		goto out;
+
+	roll = find_next_bit(hal->entity_map, NUM_OF_RTW89_SUB_ENTITY, drop + 1);
+
+	/* Follow rtw89_config_default_chandef() when rtw89_entity_recalc(). */
+	if (roll == NUM_OF_RTW89_SUB_ENTITY)
+		goto out;
+
+	/* RTW89_SUB_ENTITY_0 is going to release, and another exists.
+	 * Make another roll down to RTW89_SUB_ENTITY_0 to replace.
+	 */
+	hal->sub[roll].cfg->idx = RTW89_SUB_ENTITY_0;
+	hal->sub[RTW89_SUB_ENTITY_0] = hal->sub[roll];
+
+	rtw89_for_each_rtwvif(rtwdev, rtwvif) {
+		if (rtwvif->sub_entity_idx == roll)
+			rtwvif->sub_entity_idx = RTW89_SUB_ENTITY_0;
+	}
+
+	drop = roll;
+
+out:
+	clear_bit(drop, hal->entity_map);
 	rtw89_set_channel(rtwdev);
 }
 
@@ -225,6 +253,9 @@ int rtw89_chanctx_ops_assign_vif(struct rtw89_dev *rtwdev,
 				 struct rtw89_vif *rtwvif,
 				 struct ieee80211_chanctx_conf *ctx)
 {
+	struct rtw89_chanctx_cfg *cfg = (struct rtw89_chanctx_cfg *)ctx->drv_priv;
+
+	rtwvif->sub_entity_idx = cfg->idx;
 	return 0;
 }
 
@@ -232,4 +263,5 @@ void rtw89_chanctx_ops_unassign_vif(struct rtw89_dev *rtwdev,
 				    struct rtw89_vif *rtwvif,
 				    struct ieee80211_chanctx_conf *ctx)
 {
+	rtwvif->sub_entity_idx = RTW89_SUB_ENTITY_0;
 }

drivers/net/wireless/realtek/rtw89/core.h

@@ -2240,6 +2240,8 @@ struct rtw89_phy_rate_pattern {
 struct rtw89_vif {
 	struct list_head list;
 	struct rtw89_dev *rtwdev;
+	enum rtw89_sub_entity_idx sub_entity_idx;
+
 	u8 mac_id;
 	u8 port;
 	u8 mac_addr[ETH_ALEN];
@@ -2953,6 +2955,13 @@ enum rtw89_entity_mode {
 	RTW89_ENTITY_MODE_SCC,
 };
 
+struct rtw89_sub_entity {
+	struct cfg80211_chan_def chandef;
+	struct rtw89_chan chan;
+	struct rtw89_chan_rcd rcd;
+	struct rtw89_chanctx_cfg *cfg;
+};
+
 struct rtw89_hal {
 	u32 rx_fltr;
 	u8 cv;
@@ -2966,13 +2975,10 @@ struct rtw89_hal {
 	bool support_igi;
 
 	DECLARE_BITMAP(entity_map, NUM_OF_RTW89_SUB_ENTITY);
-	struct cfg80211_chan_def chandef[NUM_OF_RTW89_SUB_ENTITY];
+	struct rtw89_sub_entity sub[NUM_OF_RTW89_SUB_ENTITY];
 
 	bool entity_active;
 	enum rtw89_entity_mode entity_mode;
-
-	struct rtw89_chan chan[NUM_OF_RTW89_SUB_ENTITY];
-	struct rtw89_chan_rcd chan_rcd[NUM_OF_RTW89_SUB_ENTITY];
 };
 
 #define RTW89_MAX_MAC_ID_NUM 128
@@ -4138,7 +4144,7 @@ const struct cfg80211_chan_def *rtw89_chandef_get(struct rtw89_dev *rtwdev,
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
 
-	return &hal->chandef[idx];
+	return &hal->sub[idx].chandef;
 }
 
 static inline
@@ -4147,7 +4153,7 @@ const struct rtw89_chan *rtw89_chan_get(struct rtw89_dev *rtwdev,
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
 
-	return &hal->chan[idx];
+	return &hal->sub[idx].chan;
 }
 
 static inline
@@ -4156,7 +4162,7 @@ const struct rtw89_chan_rcd *rtw89_chan_rcd_get(struct rtw89_dev *rtwdev,
 {
 	struct rtw89_hal *hal = &rtwdev->hal;
 
-	return &hal->chan_rcd[idx];
+	return &hal->sub[idx].rcd;
 }
 
 static inline void rtw89_chip_fem_setup(struct rtw89_dev *rtwdev)

drivers/net/wireless/realtek/rtw89/mac80211.c

@@ -131,6 +131,7 @@ static int rtw89_ops_add_interface(struct ieee80211_hw *hw,
 	rtwvif->bcn_hit_cond = 0;
 	rtwvif->mac_idx = RTW89_MAC_0;
 	rtwvif->phy_idx = RTW89_PHY_0;
+	rtwvif->sub_entity_idx = RTW89_SUB_ENTITY_0;
 	rtwvif->hit_rule = 0;
 	ether_addr_copy(rtwvif->mac_addr, vif->addr);