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From:   Ping-Ke Shih <pkshih@realtek.com>
To:     <kvalo@kernel.org>
CC:     <damon.chen@realtek.com>, <linux-wireless@vger.kernel.org>
Subject: [PATCH] wifi: rtw89: disable 26-tone RU HE TB PPDU transmissions
Date:   Thu, 22 Sep 2022 09:27:19 +0800
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From: Kuan-Chung Chen <damon.chen@realtek.com>

Align with the spec of 802.11ax, follow the conditions for not responding
with an HE TB PPDU. When there are OBSS that cannot interpret 26-tone RU
transmissions, we should disable such transmissions.

Signed-off-by: Kuan-Chung Chen <damon.chen@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/mac.c      | 44 +++++++++++++++++++
 drivers/net/wireless/realtek/rtw89/mac.h      |  2 +
 drivers/net/wireless/realtek/rtw89/mac80211.c |  1 +
 3 files changed, 47 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/mac.c b/drivers/net/wireless/realtek/rtw89/mac.c
index dad55952e6bdc..5ab80bceb7d7a 100644
--- a/drivers/net/wireless/realtek/rtw89/mac.c
+++ b/drivers/net/wireless/realtek/rtw89/mac.c
@@ -3703,6 +3703,50 @@ int rtw89_mac_port_update(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif)
 	return 0;
 }
 
+static void rtw89_mac_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy,
+						      struct cfg80211_bss *bss,
+						      void *data)
+{
+	const struct cfg80211_bss_ies *ies;
+	const struct element *elem;
+	bool *tolerated = data;
+
+	rcu_read_lock();
+	ies = rcu_dereference(bss->ies);
+	elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, ies->data,
+				  ies->len);
+
+	if (!elem || elem->datalen < 10 ||
+	    !(elem->data[10] & WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT))
+		*tolerated = false;
+	rcu_read_unlock();
+}
+
+void rtw89_mac_set_he_obss_narrow_bw_ru(struct rtw89_dev *rtwdev,
+					struct ieee80211_vif *vif)
+{
+	struct rtw89_vif *rtwvif = (struct rtw89_vif *)vif->drv_priv;
+	struct ieee80211_hw *hw = rtwdev->hw;
+	bool tolerated = true;
+	u32 reg;
+
+	if (!vif->bss_conf.he_support || vif->type != NL80211_IFTYPE_STATION)
+		return;
+
+	if (!(vif->bss_conf.chandef.chan->flags & IEEE80211_CHAN_RADAR))
+		return;
+
+	cfg80211_bss_iter(hw->wiphy, &vif->bss_conf.chandef,
+			  rtw89_mac_check_he_obss_narrow_bw_ru_iter,
+			  &tolerated);
+
+	reg = rtw89_mac_reg_by_idx(R_AX_RXTRIG_TEST_USER_2, rtwvif->mac_idx);
+	if (tolerated)
+		rtw89_write32_clr(rtwdev, reg, B_AX_RXTRIG_RU26_DIS);
+	else
+		rtw89_write32_set(rtwdev, reg, B_AX_RXTRIG_RU26_DIS);
+}
+
 int rtw89_mac_add_vif(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif)
 {
 	int ret;
diff --git a/drivers/net/wireless/realtek/rtw89/mac.h b/drivers/net/wireless/realtek/rtw89/mac.h
index 22db80716b560..04c001b1847d8 100644
--- a/drivers/net/wireless/realtek/rtw89/mac.h
+++ b/drivers/net/wireless/realtek/rtw89/mac.h
@@ -800,6 +800,8 @@ int rtw89_mac_write_lte(struct rtw89_dev *rtwdev, const u32 offset, u32 val);
 int rtw89_mac_read_lte(struct rtw89_dev *rtwdev, const u32 offset, u32 *val);
 int rtw89_mac_add_vif(struct rtw89_dev *rtwdev, struct rtw89_vif *vif);
 int rtw89_mac_port_update(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif);
+void rtw89_mac_set_he_obss_narrow_bw_ru(struct rtw89_dev *rtwdev,
+					struct ieee80211_vif *vif);
 int rtw89_mac_remove_vif(struct rtw89_dev *rtwdev, struct rtw89_vif *vif);
 int rtw89_mac_enable_bb_rf(struct rtw89_dev *rtwdev);
 void rtw89_mac_disable_bb_rf(struct rtw89_dev *rtwdev);
diff --git a/drivers/net/wireless/realtek/rtw89/mac80211.c b/drivers/net/wireless/realtek/rtw89/mac80211.c
index e82be57f291c0..6052a2f7ad218 100644
--- a/drivers/net/wireless/realtek/rtw89/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw89/mac80211.c
@@ -356,6 +356,7 @@ static void rtw89_ops_bss_info_changed(struct ieee80211_hw *hw,
 			rtw89_phy_set_bss_color(rtwdev, vif);
 			rtw89_chip_cfg_txpwr_ul_tb_offset(rtwdev, vif);
 			rtw89_mac_port_update(rtwdev, rtwvif);
+			rtw89_mac_set_he_obss_narrow_bw_ru(rtwdev, vif);
 			rtw89_store_op_chan(rtwdev, true);
 		} else {
 			/* Abort ongoing scan if cancel_scan isn't issued
-- 
2.25.1