From c4756d5de72e549fdaa32a1fab12ae776fca5be7 Mon Sep 17 00:00:00 2001 From: Ping-Ke Shih Date: Fri, 10 Jun 2022 15:26:08 +0800 Subject: [PATCH] wifi: rtw89: fix long RX latency in low power mode In low power mode, regular IO is power off, so we don't schedule napi to poll RX and TX completion. Therefore, calling ieee80211_rx_napi() with napi instance causes long RX latency. To fix this, use NULL as argument, and then it can use netif_receive_skb_list() to receive. Signed-off-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220610072610.27095-10-pkshih@realtek.com --- drivers/net/wireless/realtek/rtw89/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c index e6b073283609..a5880a54812e 100644 --- a/drivers/net/wireless/realtek/rtw89/core.c +++ b/drivers/net/wireless/realtek/rtw89/core.c @@ -1483,11 +1483,17 @@ static void rtw89_core_rx_to_mac80211(struct rtw89_dev *rtwdev, struct sk_buff *skb_ppdu, struct ieee80211_rx_status *rx_status) { + struct napi_struct *napi = &rtwdev->napi; + + /* In low power mode, napi isn't scheduled. Receive it to netif. */ + if (unlikely(!test_bit(NAPI_STATE_SCHED, &napi->state))) + napi = NULL; + rtw89_core_hw_to_sband_rate(rx_status); rtw89_core_rx_stats(rtwdev, phy_ppdu, desc_info, skb_ppdu); /* In low power mode, it does RX in thread context. */ local_bh_disable(); - ieee80211_rx_napi(rtwdev->hw, NULL, skb_ppdu, &rtwdev->napi); + ieee80211_rx_napi(rtwdev->hw, NULL, skb_ppdu, napi); local_bh_enable(); rtwdev->napi_budget_countdown--; } -- 2.39.5