netdev - Re: [PATCH net v3] net: stmmac: xgmac: Disable FPE MMC interrupts

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Message-ID: <c09a9005-bce9-40c7-888d-d7276f434bcc@intel.com>
Date: Mon, 27 Nov 2023 15:36:38 +0100
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: Furong Xu <0x1207@...il.com>, "David S. Miller" <davem@...emloft.net>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
	<joabreu@...opsys.com>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin
	<mcoquelin.stm32@...il.com>, Joao Pinto <jpinto@...opsys.com>, Simon Horman
	<horms@...nel.org>
CC: <netdev@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<xfr@...look.com>, <rock.xu@....com>, Larysa Zaremba
	<larysa.zaremba@...el.com>
Subject: Re: [PATCH net v3] net: stmmac: xgmac: Disable FPE MMC interrupts



On 25.11.2023 07:01, Furong Xu wrote:
> Commit aeb18dd07692 ("net: stmmac: xgmac: Disable MMC interrupts
> by default") tries to disable MMC interrupts to avoid a storm of
> unhandled interrupts, but leaves the FPE(Frame Preemption) MMC
> interrupts enabled, FPE MMC interrupts can cause the same problem.
> Now we mask FPE TX and RX interrupts to disable all MMC interrupts.
> 
> Fixes: aeb18dd07692 ("net: stmmac: xgmac: Disable MMC interrupts by default")
> Reviewed-by: Larysa Zaremba <larysa.zaremba@...el.com>
> Signed-off-by: Furong Xu <0x1207@...il.com>
> ---
> Changes in v3:
>   - Update commit message, thanks Larysa.
>   - Rename register defines, thanks Serge.
> 
> Changes in v2:
>   - Update commit message, thanks Wojciech and Andrew.
> ---

Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>

>  drivers/net/ethernet/stmicro/stmmac/mmc_core.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/mmc_core.c b/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
> index ea4910ae0921..6a7c1d325c46 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
> @@ -177,8 +177,10 @@
>  #define MMC_XGMAC_RX_DISCARD_OCT_GB	0x1b4
>  #define MMC_XGMAC_RX_ALIGN_ERR_PKT	0x1bc
>  
> +#define MMC_XGMAC_TX_FPE_INTR_MASK	0x204
>  #define MMC_XGMAC_TX_FPE_FRAG		0x208
>  #define MMC_XGMAC_TX_HOLD_REQ		0x20c
> +#define MMC_XGMAC_RX_FPE_INTR_MASK	0x224
>  #define MMC_XGMAC_RX_PKT_ASSEMBLY_ERR	0x228
>  #define MMC_XGMAC_RX_PKT_SMD_ERR	0x22c
>  #define MMC_XGMAC_RX_PKT_ASSEMBLY_OK	0x230
> @@ -352,6 +354,8 @@ static void dwxgmac_mmc_intr_all_mask(void __iomem *mmcaddr)
>  {
>  	writel(0x0, mmcaddr + MMC_RX_INTR_MASK);
>  	writel(0x0, mmcaddr + MMC_TX_INTR_MASK);
> +	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_TX_FPE_INTR_MASK);
> +	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_RX_FPE_INTR_MASK);
>  	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_RX_IPC_INTR_MASK);
>  }
>