netdev - Re: [PATCH net-next v3 06/10] net: stmmac: xgmac: support per-channel irq

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Date: Thu, 10 Aug 2023 16:52:01 +0200
From: Alexandre TORGUE <alexandre.torgue@...s.st.com>
To: Jisheng Zhang <jszhang@...nel.org>,
        "David S . Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jose Abreu
	<joabreu@...opsys.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v3 06/10] net: stmmac: xgmac: support per-channel
 irq

On 8/9/23 18:50, Jisheng Zhang wrote:
> The IP supports per channel interrupt, add support for this usage case.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>   .../net/ethernet/stmicro/stmmac/dwxgmac2.h    |  2 ++
>   .../ethernet/stmicro/stmmac/dwxgmac2_dma.c    | 33 +++++++++++--------
>   2 files changed, 22 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> index 81cbb13a101d..12e1228ccf2a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> @@ -327,6 +327,8 @@
>   
>   /* DMA Registers */
>   #define XGMAC_DMA_MODE			0x00003000
> +#define XGMAC_INTM			GENMASK(13, 12)
> +#define XGMAC_INTM_MODE1		0x1
>   #define XGMAC_SWR			BIT(0)
>   #define XGMAC_DMA_SYSBUS_MODE		0x00003004
>   #define XGMAC_WR_OSR_LMT		GENMASK(29, 24)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> index b5ba4e0cca55..ef25af92d6cc 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
> @@ -31,6 +31,13 @@ static void dwxgmac2_dma_init(void __iomem *ioaddr,
>   		value |= XGMAC_EAME;
>   
>   	writel(value, ioaddr + XGMAC_DMA_SYSBUS_MODE);
> +
> +	if (dma_cfg->perch_irq_en) {
> +		value = readl(ioaddr + XGMAC_DMA_MODE);
> +		value &= ~XGMAC_INTM;
> +		value |= FIELD_PREP(XGMAC_INTM, XGMAC_INTM_MODE1);
> +		writel(value, ioaddr + XGMAC_DMA_MODE);
> +	}
>   }
>   
>   static void dwxgmac2_dma_init_chan(struct stmmac_priv *priv,
> @@ -365,20 +372,20 @@ static int dwxgmac2_dma_interrupt(struct stmmac_priv *priv,
>   	}
>   
>   	/* TX/RX NORMAL interrupts */
> -	if (likely(intr_status & XGMAC_NIS)) {

No longer need to check NIS bit ?

> -		if (likely(intr_status & XGMAC_RI)) {
> -			u64_stats_update_begin(&rx_q->rxq_stats.syncp);
> -			rx_q->rxq_stats.rx_normal_irq_n++;
> -			u64_stats_update_end(&rx_q->rxq_stats.syncp);
> -			ret |= handle_rx;
> -		}
> -		if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
> -			u64_stats_update_begin(&tx_q->txq_stats.syncp);
> -			tx_q->txq_stats.tx_normal_irq_n++;
> -			u64_stats_update_end(&tx_q->txq_stats.syncp);
> -			ret |= handle_tx;
> -		}
> +	if (likely(intr_status & XGMAC_RI)) {
> +		u64_stats_update_begin(&rx_q->rxq_stats.syncp);
> +		rx_q->rxq_stats.rx_normal_irq_n++;
> +		u64_stats_update_end(&rx_q->rxq_stats.syncp);
> +		ret |= handle_rx;
> +	}
> +	if (likely(intr_status & XGMAC_TI)) {
> +		u64_stats_update_begin(&tx_q->txq_stats.syncp);
> +		tx_q->txq_stats.tx_normal_irq_n++;
> +		u64_stats_update_end(&tx_q->txq_stats.syncp);
> +		ret |= handle_tx;
>   	}
> +	if (unlikely(intr_status & XGMAC_TBU))
> +		ret |= handle_tx;
>   
>   	/* Clear interrupts */
>   	writel(intr_en & intr_status, ioaddr + XGMAC_DMA_CH_STATUS(chan));