linux-kernel - Re: [PATCH net v2 1/1] net: stmmac: xgmac: Disable FPE MMC interrupts

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Date:   Sat, 25 Nov 2023 13:28:14 +0800
From:   Furong Xu <0x1207@...il.com>
To:     Serge Semin <fancer.lancer@...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
Subject: Re: [PATCH net v2 1/1] net: stmmac: xgmac: Disable FPE MMC
 interrupts

On Fri, 24 Nov 2023 20:03:43 +0300
Serge Semin <fancer.lancer@...il.com> wrote:

> On Fri, Nov 24, 2023 at 09:54:33AM +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.
> > Now we mask FPE TX and RX interrupts to disable all MMC interrupts.
> > 
> > Fixes: aeb18dd07692 ("net: stmmac: xgmac: Disable MMC interrupts by default")
> > Signed-off-by: Furong Xu <0x1207@...il.com>
> > ---
> > 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..cdd7fbde2bfa 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_FPE_TX_INTR_MASK	0x204
> >  #define MMC_XGMAC_TX_FPE_FRAG		0x208
> >  #define MMC_XGMAC_TX_HOLD_REQ		0x20c
> > +#define MMC_XGMAC_FPE_RX_INTR_MASK	0x224  
> 
> Could you please preserve the local implicit naming convention of
> having the Tx_ and RX_ prefixes being placed before the rest of
> CSR-specific name part:
> #define MMC_XGMAC_TX_FPE_INTR_MASK
> instead of
> #define MMC_XGMAC_FPE_TX_INTR_MASK
> and
> #define MMC_XGMAC_RX_FPE_INTR_MASK
> instead of
> #define MMC_XGMAC_FPE_RX_INTR_MASK
> 
> Your macros will then look similar to MMC_XGMAC_TX_*, MMC_XGMAC_RX_*
> and finally MMC_XGMAC_RX_IPC_INTR_MASK macros.
> 
> -Serge(y)
> 

Hi Serge,

Thanks for your advice, I copied these register names from Synopsys Databook, and
forgot to preserve the local implicit naming convention, I will send a new patch.

> >  #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_FPE_TX_INTR_MASK);
> > +	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_FPE_RX_INTR_MASK);
> >  	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_RX_IPC_INTR_MASK);
> >  }
> >  
> > -- 
> > 2.34.1
> > 
> >