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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Subject: [PATCH] mt76: fix dfs state issue with 160 MHz channels
Date:   Thu, 24 Feb 2022 14:39:05 +0100
Message-Id: <20220224133905.49774-1-nbd@nbd.name>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

When operating on a mix of DFS and non-DFS channels, the driver only checks
the CAC status of the control channel. This causes beacons/tx to fail if the
control channel is on a non-DFS channel.
Fix this by calling cfg80211_reg_can_beacon to determine the DFS status of
all affected channels

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/net/wireless/mediatek/mt76/mac80211.c   | 2 +-
 drivers/net/wireless/mediatek/mt76/mt7615/mcu.c | 8 +++++---
 drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 8 +++++---
 drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 8 +++++---
 4 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 9796419c99e1..372b94a665ec 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -1658,7 +1658,7 @@ enum mt76_dfs_state mt76_phy_dfs_state(struct mt76_phy *phy)
 		return MT_DFS_STATE_DISABLED;
 	}
 
-	if (phy->chandef.chan->dfs_state != NL80211_DFS_AVAILABLE)
+	if (!cfg80211_reg_can_beacon(hw->wiphy, &phy->chandef, NL80211_IFTYPE_AP))
 		return MT_DFS_STATE_CAC;
 
 	return MT_DFS_STATE_ACTIVE;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 120760ea1c89..e98c6076a633 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -2151,10 +2151,12 @@ int mt7615_mcu_set_chan_info(struct mt7615_phy *phy, int cmd)
 		.center_chan2 = ieee80211_frequency_to_channel(freq2),
 	};
 
-	if (phy->mt76->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+	if (cmd == MCU_EXT_CMD(SET_RX_PATH))
+		req.switch_reason = CH_SWITCH_NORMAL;
+	else if (phy->mt76->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
 		req.switch_reason = CH_SWITCH_SCAN_BYPASS_DPD;
-	else if ((chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
-		 chandef->chan->dfs_state != NL80211_DFS_AVAILABLE)
+	else if (!cfg80211_reg_can_beacon(phy->mt76->hw->wiphy, chandef,
+					  NL80211_IFTYPE_AP))
 		req.switch_reason = CH_SWITCH_DFS;
 	else
 		req.switch_reason = CH_SWITCH_NORMAL;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 8c014299daa1..119f9358162f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2811,10 +2811,12 @@ int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd)
 	}
 #endif
 
-	if (phy->mt76->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+	if (cmd == MCU_EXT_CMD(SET_RX_PATH))
+		req.switch_reason = CH_SWITCH_NORMAL;
+	else if (phy->mt76->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
 		req.switch_reason = CH_SWITCH_SCAN_BYPASS_DPD;
-	else if (phy->mt76->hw->conf.radar_enabled &&
-		 chandef->chan->dfs_state != NL80211_DFS_AVAILABLE)
+	else if (!cfg80211_reg_can_beacon(phy->mt76->hw->wiphy, chandef,
+					  NL80211_IFTYPE_AP))
 		req.switch_reason = CH_SWITCH_DFS;
 	else
 		req.switch_reason = CH_SWITCH_NORMAL;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 33a836825cca..e7adcba7a8bf 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -863,10 +863,12 @@ int mt7921_mcu_set_chan_info(struct mt7921_phy *phy, int cmd)
 	else
 		req.channel_band = chandef->chan->band;
 
-	if (dev->mt76.hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+	if (cmd == MCU_EXT_CMD(SET_RX_PATH))
+		req.switch_reason = CH_SWITCH_NORMAL;
+	else if (dev->mt76.hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
 		req.switch_reason = CH_SWITCH_SCAN_BYPASS_DPD;
-	else if ((chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
-		 chandef->chan->dfs_state != NL80211_DFS_AVAILABLE)
+	else if (!cfg80211_reg_can_beacon(dev->mt76.hw->wiphy, chandef,
+					  NL80211_IFTYPE_AP))
 		req.switch_reason = CH_SWITCH_DFS;
 	else
 		req.switch_reason = CH_SWITCH_NORMAL;
-- 
2.32.0 (Apple Git-132)