From fb9829e90dcd5365c45478629e45075560ea8644 Mon Sep 17 00:00:00 2001
From: Ping-Ke Shih <pkshih@realtek.com>
Date: Mon, 13 Nov 2017 17:39:33 +0800
Subject: [PATCH] rtlwifi: Reduce IO in RX interrupt to boost throughput
Git-commit: fb9829e90dcd5365c45478629e45075560ea8644
Patch-mainline: v4.16-rc1
References: FATE#326906
Check remaining count of RX packets cost a lot of CPU time, so only update
when the counter decreases to zero. In old flow, the counter was updated
once a RX packet is received.
Signed-off-by: Steven Ting <steventing@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/realtek/rtlwifi/pci.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index ed6e4a5b99de..b28e6e35c6db 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -747,7 +747,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
u8 tmp_one;
bool unicast = false;
u8 hw_queue = 0;
- unsigned int rx_remained_cnt;
+ unsigned int rx_remained_cnt = 0;
struct rtl_stats stats = {
.signal = 0,
.rate = 0,
@@ -768,7 +768,8 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
struct sk_buff *new_skb;
if (rtlpriv->use_new_trx_flow) {
- rx_remained_cnt =
+ if (rx_remained_cnt == 0)
+ rx_remained_cnt =
rtlpriv->cfg->ops->rx_desc_buff_remained_cnt(hw,
hw_queue);
if (rx_remained_cnt == 0)
--
2.19.2