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

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Message-ID: <20210816104746.GA9014@linux.intel.com>
Date:   Mon, 16 Aug 2021 18:47:46 +0800
From:   Wong Vee Khee <vee.khee.wong@...ux.intel.com>
To:     Vijayakannan Ayyathurai <vijayakannan.ayyathurai@...el.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.com, vee.khee.wong@...el.com,
        weifeng.voon@...el.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/3] net: stmmac: fix INTR TBU status
 affecting irq count statistic

On Mon, Aug 16, 2021 at 02:15:58PM +0800, Vijayakannan Ayyathurai wrote:
> 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.
>

Acked-by: Wong Vee Khee <vee.khee.wong@...ux.intel.com>
 
> 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++;
>