From: Mehmet Fide The frames held for dozing stations go out right after the DTIM beacon and only for the duration of the ATIM window. The chips come up with a 2 TU window (the two that program it set 0x2 at init), which drains about three frames per DTIM; the vendor driver sets 0xa or 0xc in AP mode instead. With the 2 TU window the measured page pool exhaustion takes ~100 s of ordinary multicast chatter; at 0x4 the same storm already drains, so 0xa leaves comfortable headroom. Program 0xa when an AP interface starts and put the default back when it stops, since most chips never initialize the register themselves. The bound and the filter of the previous patches still apply: the window adds drain capacity, the budget protects the pool when that is not enough, the filter keeps chatter off the beacon-paced path. Suggested-by: Ping-Ke Shih Signed-off-by: Mehmet Fide --- v2: - new patch, REG_ATIMWND 0xa in AP mode as in the vendor driver, back to the 0x2 default on stop_ap since most chips never program it (Ping-Ke) drivers/net/wireless/realtek/rtw88/mac80211.c | 2 ++ drivers/net/wireless/realtek/rtw88/reg.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c index 0b622d7663b6..2a9b09fa76e7 100644 --- a/drivers/net/wireless/realtek/rtw88/mac80211.c +++ b/drivers/net/wireless/realtek/rtw88/mac80211.c @@ -474,6 +474,7 @@ static int rtw_ops_start_ap(struct ieee80211_hw *hw, mutex_lock(&rtwdev->mutex); rtw_write32_set(rtwdev, REG_TCR, BIT_TCR_UPDATE_HGQMD); + rtw_write16(rtwdev, REG_ATIMWND, ATIMWND_AP); rtwdev->ap_active = true; rtw_store_op_chan(rtwdev, true); chip->ops->phy_calibration(rtwdev); @@ -490,6 +491,7 @@ static void rtw_ops_stop_ap(struct ieee80211_hw *hw, mutex_lock(&rtwdev->mutex); rtw_write32_clr(rtwdev, REG_TCR, BIT_TCR_UPDATE_HGQMD); + rtw_write16(rtwdev, REG_ATIMWND, ATIMWND_DEFAULT); rtwdev->ap_active = false; if (!rtw_core_check_sta_active(rtwdev)) rtw_clear_op_chan(rtwdev); diff --git a/drivers/net/wireless/realtek/rtw88/reg.h b/drivers/net/wireless/realtek/rtw88/reg.h index 08e9494977e0..0b9ba6f37680 100644 --- a/drivers/net/wireless/realtek/rtw88/reg.h +++ b/drivers/net/wireless/realtek/rtw88/reg.h @@ -483,6 +483,8 @@ #define REG_DRVERLYINT 0x0558 #define REG_BCNDMATIM 0x0559 #define REG_ATIMWND 0x055A +#define ATIMWND_DEFAULT 0x2 +#define ATIMWND_AP 0xa #define REG_USTIME_TSF 0x055C #define REG_BCN_MAX_ERR 0x055D #define REG_RXTSF_OFFSET_CCK 0x055E -- 2.55.0