netdev - [PATCH net-next v1 1/3] net: stmmac: fix INTR TBU status affecting irq count statistic

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Date:   Mon, 16 Aug 2021 14:15:58 +0800
From:   Vijayakannan Ayyathurai <vijayakannan.ayyathurai@...el.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.com
Cc:     vee.khee.wong@...el.com, weifeng.voon@...el.com,
        vijayakannan.ayyathurai@...el.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v1 1/3] net: stmmac: fix INTR TBU status affecting irq count statistic

From: Voon Weifeng <weifeng.voon@...el.com>

DMA channel status "Transmit buffer unavailable(TBU)" bit is not
considered as a successful dma tx. Hence, it should not affect
all the irq count statistic.

Fixes: 1103d3a5531c ("net: stmmac: dwmac4: Also use TBU interrupt to clean TX path")
Signed-off-by: Voon Weifeng <weifeng.voon@...el.com>
Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
index e63270267578..f83db62938dd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
@@ -172,11 +172,12 @@ int dwmac4_dma_interrupt(void __iomem *ioaddr,
 		x->rx_normal_irq_n++;
 		ret |= handle_rx;
 	}
-	if (likely(intr_status & (DMA_CHAN_STATUS_TI |
-		DMA_CHAN_STATUS_TBU))) {
+	if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
 		x->tx_normal_irq_n++;
 		ret |= handle_tx;
 	}
+	if (unlikely(intr_status & DMA_CHAN_STATUS_TBU))
+		ret |= handle_tx;
 	if (unlikely(intr_status & DMA_CHAN_STATUS_ERI))
 		x->rx_early_irq++;
 
-- 
2.17.1