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mt76: mt7615: fix throughput regression on DFS channels 

For some reason, mt7615 reacts badly to repeatedly enabling/disabling the radar
detector without also switching the channel.
This results in very bad throughput on DFS channels, because
hw->conf.radar_enabled can get toggled a few times after CAC ends.
Fix this by always leaving the DFS detector enabled on DFS channels and instead
suppress unwanted detection events.

Fixes: 2c86f67520 ("mt76: mt7615: fix/rewrite the dfs state handling logic")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-06-24 20:57:47 +02:00
parent 3c1032e122
commit aac86cebb4
4 changed files with 7 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
View File

@ -2231,6 +2231,7 @@ mt7615_dfs_init_radar_specs(struct mt7615_phy *phy)
int mt7615_dfs_init_radar_detector(struct mt7615_phy *phy)
{
struct cfg80211_chan_def *chandef = &phy->mt76->chandef;
struct mt7615_dev *dev = phy->dev;
bool ext_phy = phy != &dev->phy;
enum mt76_dfs_state dfs_state, prev_state;
@ -2241,13 +2242,13 @@ int mt7615_dfs_init_radar_detector(struct mt7615_phy *phy)
prev_state = phy->mt76->dfs_state;
dfs_state = mt76_phy_dfs_state(phy->mt76);
if ((chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
dfs_state < MT_DFS_STATE_CAC)
dfs_state = MT_DFS_STATE_ACTIVE;
if (prev_state == dfs_state)
return 0;
if (prev_state == MT_DFS_STATE_UNKNOWN)
mt7615_dfs_stop_radar_detector(phy);
if (dfs_state == MT_DFS_STATE_DISABLED)
goto stop;

21
drivers/net/wireless/mediatek/mt76/mt7615/main.c
View File

@ -282,26 +282,6 @@ static void mt7615_remove_interface(struct ieee80211_hw *hw,
mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
}
static void mt7615_init_dfs_state(struct mt7615_phy *phy)
{
struct mt76_phy *mphy = phy->mt76;
struct ieee80211_hw *hw = mphy->hw;
struct cfg80211_chan_def *chandef = &hw->conf.chandef;
if (hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
return;
if (!(chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
!(mphy->chandef.chan->flags & IEEE80211_CHAN_RADAR))
return;
if (mphy->chandef.chan->center_freq == chandef->chan->center_freq &&
mphy->chandef.width == chandef->width)
return;
phy->dfs_state = -1;
}
int mt7615_set_channel(struct mt7615_phy *phy)
{
struct mt7615_dev *dev = phy->dev;
@ -314,7 +294,6 @@ int mt7615_set_channel(struct mt7615_phy *phy)
set_bit(MT76_RESET, &phy->mt76->state);
mt7615_init_dfs_state(phy);
mt76_set_channel(phy->mt76);
if (is_mt7615(&dev->mt76) && dev->flash_eeprom) {

3
drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
View File

@ -391,6 +391,9 @@ mt7615_mcu_rx_radar_detected(struct mt7615_dev *dev, struct sk_buff *skb)
if (r->band_idx && dev->mt76.phy2)
mphy = dev->mt76.phy2;
if (mt76_phy_dfs_state(mphy) < MT_DFS_STATE_CAC)
return;
ieee80211_radar_detected(mphy->hw);
dev->hw_pattern++;
}

1
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
View File

@ -178,7 +178,6 @@ struct mt7615_phy {
u8 chfreq;
u8 rdd_state;
int dfs_state;
u32 rx_ampdu_ts;
u32 ampdu_ref;