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Message-ID: <8ed8450f-a9c7-4e9d-97b8-3d26668c7eb4@quicinc.com>
Date: Mon, 18 Dec 2023 15:27:54 +0530
From: Suraj Jaiswal <quic_jsuraj@...cinc.com>
To: Serge Semin <fancer.lancer@...il.com>
CC: Vinod Koul <vkoul@...nel.org>, Bhupesh Sharma <bhupesh.sharma@...aro.org>,
Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
"David S. Miller"
<davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
<kuba@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu
<joabreu@...opsys.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>, <netdev@...r.kernel.org>,
<linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
Prasad Sodagudi
<psodagud@...cinc.com>,
Andrew Halaney <ahalaney@...hat.com>, Rob Herring
<robh@...nel.org>,
<kernel@...cinc.com>
Subject: Re: [PATCH net-next v6 3/3] net: stmmac: Add driver support for
DWMAC5 common safety IRQ
Hi Serge,
Please find commnet inline & let me know if any further action needed
Thanks
Suraj
On 12/14/2023 8:42 PM, Serge Semin wrote:
> Hi Suraj
>
> On Tue, Dec 12, 2023 at 05:28:41PM +0530, Suraj Jaiswal wrote:
>> Add support to listen HW safety IRQ like ECC(error
>> correction code), DPP(data path parity), FSM(finite state
>> machine) fault in common IRQ line.
>>
>> Signed-off-by: Suraj Jaiswal <quic_jsuraj@...cinc.com>
>> ---
>> drivers/net/ethernet/stmicro/stmmac/common.h | 1 +
>> drivers/net/ethernet/stmicro/stmmac/stmmac.h | 3 +++
>> .../net/ethernet/stmicro/stmmac/stmmac_main.c | 21 +++++++++++++++++++
>> .../ethernet/stmicro/stmmac/stmmac_platform.c | 9 ++++++++
>> 4 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
>> index 721c1f8e892f..b9233b09b80f 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
>> @@ -344,6 +344,7 @@ enum request_irq_err {
>> REQ_IRQ_ERR_ALL,
>> REQ_IRQ_ERR_TX,
>> REQ_IRQ_ERR_RX,
>> + REQ_IRQ_ERR_SFTY,
>> REQ_IRQ_ERR_SFTY_UE,
>> REQ_IRQ_ERR_SFTY_CE,
>> REQ_IRQ_ERR_LPI,
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> index 9f89acf31050..ca3d93851bed 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> @@ -31,6 +31,7 @@ struct stmmac_resources {
>> int wol_irq;
>> int lpi_irq;
>> int irq;
>> + int sfty_irq;
>> int sfty_ce_irq;
>> int sfty_ue_irq;
>> int rx_irq[MTL_MAX_RX_QUEUES];
>> @@ -297,6 +298,7 @@ struct stmmac_priv {
>> void __iomem *ptpaddr;
>> void __iomem *estaddr;
>> unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
>> + int sfty_irq;
>> int sfty_ce_irq;
>> int sfty_ue_irq;
>> int rx_irq[MTL_MAX_RX_QUEUES];
>> @@ -305,6 +307,7 @@ struct stmmac_priv {
>> char int_name_mac[IFNAMSIZ + 9];
>> char int_name_wol[IFNAMSIZ + 9];
>> char int_name_lpi[IFNAMSIZ + 9];
>> + char int_name_sfty[IFNAMSIZ + 10];
>> char int_name_sfty_ce[IFNAMSIZ + 10];
>> char int_name_sfty_ue[IFNAMSIZ + 10];
>> char int_name_rx_irq[MTL_MAX_TX_QUEUES][IFNAMSIZ + 14];
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 47de466e432c..6cf289f192a7 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_SFTY:
>> + if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq)
>> + free_irq(priv->sfty_irq, dev);
>> + fallthrough;
>> case REQ_IRQ_ERR_WOL:
>> free_irq(dev->irq, dev);
>> fallthrough;
>> @@ -3759,6 +3763,7 @@ static int stmmac_request_irq_single(struct net_device *dev)
>> struct stmmac_priv *priv = netdev_priv(dev);
>> enum request_irq_err irq_err;
>> int ret;
>
>> + char *int_name;
>
> See my comment below.
>
>>
>> ret = request_irq(dev->irq, stmmac_interrupt,
>> IRQF_SHARED, dev->name, dev);
>> @@ -3798,6 +3803,20 @@ static int stmmac_request_irq_single(struct net_device *dev)
>> }
>> }
>>
>
>> + if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
>> + 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);
>> + if (unlikely(ret < 0)) {
>> + netdev_err(priv->dev,
>> + "%s: alloc safety failed %d (error: %d)\n",
>> + __func__, priv->sfty_irq, ret);
>> + irq_err = REQ_IRQ_ERR_SFTY;
>> + goto irq_error;
>> + }
>> + }
>> +
>
> Omg, I thought this change belonged to stmmac_request_irq_multi_msi().
> My bad, sorry. Please move the code above to
> stmmac_request_irq_multi_msi() and get back the part in
> stmmac_request_irq_single() as it was in v5, but instead of specifying
> "safety" IRQ name use "dev->name" as the rest of similar code snippets
> in here have:
>
> + if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
> + ret = request_irq(priv->sfty_irq, stmmac_safety_interrupt,
> + 0, dev->name, dev);
> + if (unlikely(ret < 0)) {
> + netdev_err(priv->dev,
> + "%s: alloc safety failed %d (error: %d)\n",
> + __func__, priv->sfty_irq, ret);
> + irq_err = REQ_IRQ_ERR_SFTY;
> + goto irq_error;
> + }
> + }
<Suraj> We can not use "dev->name" as this is name already used by "stmmac_interrupt" @ https://elixir.bootlin.com/linux/v6.1.68/source/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c#L3655.
<
ret = request_irq(dev->irq, stmmac_interrupt,
IRQF_SHARED, dev->name, dev);
>
if we are using same "dev->name" while requesting safety IRQ as well then "/proc/interrupt" will show same name eth0/eth1 for both "stmmac_interrupt" & "safety interrupt" and by looking at "/proc/interrupt" output we can not say which IRQ is for safety and which is for stmmac_interrupt.
>
> I guess at some point afterwards we'll need to refactor the IRQs
> request part of this driver: replace stmmac_request_irq_single() body
> with the upper part of the stmmac_request_irq_multi_msi() method and
> then just make the former method being called from the later one...
>
>> return 0;
>>
>> irq_error:
>> @@ -7462,8 +7481,10 @@ int stmmac_dvr_probe(struct device *device,
>> priv->dev->irq = res->irq;
>> priv->wol_irq = res->wol_irq;
>> priv->lpi_irq = res->lpi_irq;
>> + priv->sfty_irq = res->sfty_irq;
>> priv->sfty_ce_irq = res->sfty_ce_irq;
>> priv->sfty_ue_irq = res->sfty_ue_irq;
>
>> +
>
> Please drop this change. The code below is attached to the code above
> because it basically does the same but in the loop.
<Suraj> below loop code "for (i = 0; i < MTL_MAX_RX_QUEUES; i++) priv->rx_irq[i] = res->rx_irq[i];" is not for rx_irq array and will not help for safety irq.
Let me know if I got your commnet properly .
>
>> 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..3808a3225a7d 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->sfty_irq =
>> + platform_get_irq_byname_optional(pdev, "sfty");
>
>> +
>
> Please drop this change too. It's normal to have a method call
> attached to the error check statement especially seeing the rest of
> the similar code snippets are designed that way in this function.
<Suraj> Do you means to remove all below code where we are printing the dev_info() message ?
We added this code similar to LPM code.
>
> -Serge(y)
>
>> + if (stmmac_res->sfty_irq < 0) {
>> + if (stmmac_res->sfty_irq == -EPROBE_DEFER)
>> + 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
>>
>>
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