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

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Message-ID: <4zucnqqunr6rb6k2g4737ksma4r6q5eizopvmvnmeyrhd4pio2@cism5prdsxmq>
Date:   Mon, 27 Nov 2023 13:32:10 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Furong Xu <0x1207@...il.com>
Cc:     "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>, 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 Sat, Nov 25, 2023 at 02:01:26PM +0800, 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.

The fix looking good now. Thanks!
Reviewed-by: Serge Semin <fancer.lancer@...il.com>

-Serge(y)

> 
> Changes in v2:
>   - Update commit message, thanks Wojciech and Andrew.
> ---
>  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);
>  }
>  
> -- 
> 2.34.1
> 
>