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Message-ID: <d500225b-ef2c-4c2f-908a-7438f5e40e30@quicinc.com>
Date:   Tue, 12 Dec 2023 17:32:27 +0530
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Subject: Re: [PATCH net-next v5 3/3] net: stmmac: Add driver support for
 DWMAC5 safety IRQ support
Content-Language: en-US
To:     Serge Semin <fancer.lancer@gmail.com>
CC:     Vinod Koul <vkoul@kernel.org>,
        Bhupesh Sharma <bhupesh.sharma@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        <netdev@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Prasad Sodagudi <psodagud@quicinc.com>,
        Andrew Halaney <ahalaney@redhat.com>,
        Rob Herring <robh@kernel.org>, <kernel@quicinc.com>
References: <20231211080153.3005122-1-quic_jsuraj@quicinc.com>
 <20231211080153.3005122-4-quic_jsuraj@quicinc.com>
 <fa362vwmgtfs2iofwteuk3mwh22eu7nds4dh2rw3cax5edh4kp@gf3bhl526yla>
From:   Suraj Jaiswal <quic_jsuraj@quicinc.com>
In-Reply-To: <fa362vwmgtfs2iofwteuk3mwh22eu7nds4dh2rw3cax5edh4kp@gf3bhl526yla>
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hi Serge,
Taken care of below comment in the next version . Please review 

Thanks
Suraj

On 12/11/2023 7:25 PM, Serge Semin wrote:
> Hi Suraj
> 
>> [PATCH net-next v5 3/3] net: stmmac: Add driver support for DWMAC5 safety IRQ support
> On Mon, Dec 11, 2023 at 01:31:53PM +0530, Suraj Jaiswal wrote:
>> Add IRQ support to listen HW safety IRQ like ECC(error
>> correction code), DPP(data path parity), FSM(finite state
>> machine) fault and print the fault information in the kernel
>> log.
> 
> I guess the subject and the patch log are a bit misleading. Safety
> IRQs have been supported by the kernel since commit 8bf993a5877e
> ("net: stmmac: Add support for DWMAC5 and implement Safety Features").
> Meanwhile based on the patch body what you are doing here is adding
> the common safety IRQ line support. Please fix it.
> 
>>
>> Signed-off-by: Suraj Jaiswal <quic_jsuraj@quicinc.com>
>> ---
>>  drivers/net/ethernet/stmicro/stmmac/common.h   |  1 +
>>  drivers/net/ethernet/stmicro/stmmac/stmmac.h   |  2 ++
>>  .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 ++++++++++++++++++
>>  .../ethernet/stmicro/stmmac/stmmac_platform.c  |  9 +++++++++
>>  4 files changed, 30 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
>> index 721c1f8e892f..cb9645fe16d8 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
>> @@ -347,6 +347,7 @@ enum request_irq_err {
> 
>>  	REQ_IRQ_ERR_SFTY_UE,
>>  	REQ_IRQ_ERR_SFTY_CE,
>>  	REQ_IRQ_ERR_LPI,
>> +	REQ_IRQ_ERR_SAFETY,
> 
> 1. For the sake of unification please use the REQ_IRQ_ERR_SFTY id
> instead, since the individual UE and CE IRQs have already been defined
> that way.
> 
> 2. For readability please group up the IRQs of the same type. Like
> this:
> +	REQ_IRQ_ERR_SFTY,
>   	REQ_IRQ_ERR_SFTY_UE,
>  	REQ_IRQ_ERR_SFTY_CE,
> * Note it would be also better to have the common IRQ ID being defined
> * above the individual ones.
> 
>>  	REQ_IRQ_ERR_WOL,
>>  	REQ_IRQ_ERR_MAC,
>>  	REQ_IRQ_ERR_NO,
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> index 9f89acf31050..aa2eda6fb927 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> @@ -33,6 +33,7 @@ struct stmmac_resources {
>>  	int irq;
>>  	int sfty_ce_irq;
>>  	int sfty_ue_irq;
> 
>> +	int safety_common_irq;
> 
> ditto:
> 
> +	int sfty_irq;
>  	int sfty_ce_irq;
>  	int sfty_ue_irq;
> 
> Note there is no need in the "common" word in the name, just sfty_irq
> is enough to infer that it's a common IRQ number.
> 
>>  	int rx_irq[MTL_MAX_RX_QUEUES];
>>  	int tx_irq[MTL_MAX_TX_QUEUES];
>>  };
>> @@ -299,6 +300,7 @@ struct stmmac_priv {
>>  	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
> 
>>  	int sfty_ce_irq;
>>  	int sfty_ue_irq;
>> +	int safety_common_irq;
> 
> ditto:
> +	int sfty_irq;
>  	int sfty_ce_irq;
>  	int sfty_ue_irq;
> 
>>  	int rx_irq[MTL_MAX_RX_QUEUES];
>>  	int tx_irq[MTL_MAX_TX_QUEUES];
>>  	/*irq name */
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 47de466e432c..e4a0d9ec8b3f 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -3592,6 +3592,10 @@ static void stmmac_free_irq(struct net_device *dev,
>>  		if (priv->wol_irq > 0 && priv->wol_irq != dev->irq)
>>  			free_irq(priv->wol_irq, dev);
>>  		fallthrough;
> 
>> +	case REQ_IRQ_ERR_SAFETY:
>> +		if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq)
>> +			free_irq(priv->safety_common_irq, dev);
> 
> s/SAFETY/SFTY
> s/common_//
> s/safety/sfty
> 
>> +		fallthrough;
>>  	case REQ_IRQ_ERR_WOL:
>>  		free_irq(dev->irq, dev);
>>  		fallthrough;
>> @@ -3798,6 +3802,18 @@ static int stmmac_request_irq_single(struct net_device *dev)
>>  		}
>>  	}
>>  
> 
>> +	if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq) {
> 
> s/common_//
> s/safety/sfty
> 
>> +		ret = request_irq(priv->safety_common_irq, stmmac_safety_interrupt,
> 
> s/safety_common_irq/sfty_irq
> 
>> +				  0, "safety", dev);
> 
> The rest of the IRQ names are determined as:
> 
> 		int_name = priv->int_name_sfty;
> 		sprintf(int_name, "%s:%s", dev->name, "safety");
> 		ret = request_irq(priv->sfty_irq,
> 				  stmmac_safety_interrupt,
> 				  0, int_name, dev);
> 
> For maintainability it would be better to keep the code unified and
> have the same pattern implemented here too.
> 
>> +		if (unlikely(ret < 0)) {
>> +			netdev_err(priv->dev,
>> +				   "%s: alloc safety failed %d (error: %d)\n",
> 
>> +				   __func__, priv->safety_common_irq, ret);
>> +			irq_err = REQ_IRQ_ERR_SAFETY;
> 
> s/common_//
> s/safety/sfty
> s/SAFETY/SFTY
> 
>> +			goto irq_error;
>> +		}
>> +	}
>> +
>>  	return 0;
>>  
>>  irq_error:
>> @@ -7464,6 +7480,8 @@ int stmmac_dvr_probe(struct device *device,
>>  	priv->lpi_irq = res->lpi_irq;
>>  	priv->sfty_ce_irq = res->sfty_ce_irq;
>>  	priv->sfty_ue_irq = res->sfty_ue_irq;
> 
>> +	priv->safety_common_irq = res->safety_common_irq;
>> +
> 
> s/common_//
> s/safety/sfty
> 
>>  	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
>>  		priv->rx_irq[i] = res->rx_irq[i];
>>  	for (i = 0; i < MTL_MAX_TX_QUEUES; i++)
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 1ffde555da47..41a4a253d75b 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -726,6 +726,15 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
>>  		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
>>  	}
>>  
> 
>> +	stmmac_res->safety_common_irq =
>> +		platform_get_irq_byname_optional(pdev, "safety");
> 
> Please define the IRQ resource name as "sfty" to be looking as the
> individual safety IRQ names.
> 
>> +
>> +	if (stmmac_res->safety_common_irq < 0) {
>> +		if (stmmac_res->safety_common_irq == -EPROBE_DEFER)
> 
> s/common_//
> s/safety/sfty
> 
> -Serge(y)
> 
>> +			return -EPROBE_DEFER;
>> +		dev_info(&pdev->dev, "IRQ safety IRQ not found\n");
>> +	}
>> +
>>  	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
>>  
>>  	return PTR_ERR_OR_ZERO(stmmac_res->addr);
>> -- 
>> 2.25.1
>>
>>