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

[Wong Vee Khee <vee.khee.wong@linux.intel.com>]

On Mon, Aug 16, 2021 at 02:15:58PM +0800, Vijayakannan Ayyathurai wrote:
> From: Voon Weifeng <weifeng.voon@intel.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@linux.intel.com>
 
> Fixes: 1103d3a5531c ("net: stmmac: dwmac4: Also use TBU interrupt to clean TX path")
> Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
> Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.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++;
>