[PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Frank Wunderlich]

From: Frank Wunderlich <frank-w@public-files.de>

Add named interrupts and keep index based fallback for exiting devicetrees.

Currently only rx and tx IRQs are defined to be used with mt7988, but
later extended with RSS/LRO support.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Simon Horman <horms@kernel.org>
---
v2:
- move irqs loading part into own helper function
- reduce indentation
- place mtk_get_irqs helper before the irq_handler (note for simon)
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 39 +++++++++++++++------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index b76d35069887..81ae8a6fe838 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -3337,6 +3337,30 @@ static void mtk_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	schedule_work(&eth->pending_work);
 }
 
+static int mtk_get_irqs(struct platform_device *pdev, struct mtk_eth *eth)
+{
+	int i;
+
+	eth->irq[1] = platform_get_irq_byname(pdev, "tx");
+	eth->irq[2] = platform_get_irq_byname(pdev, "rx");
+	if (eth->irq[1] >= 0 && eth->irq[2] >= 0)
+		return 0;
+
+	for (i = 0; i < 3; i++) {
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
+			eth->irq[i] = eth->irq[0];
+		else
+			eth->irq[i] = platform_get_irq(pdev, i);
+
+		if (eth->irq[i] < 0) {
+			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
+			return -ENXIO;
+		}
+	}
+
+	return 0;
+}
+
 static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
 {
 	struct mtk_eth *eth = _eth;
@@ -5106,17 +5130,10 @@ static int mtk_probe(struct platform_device *pdev)
 		}
 	}
 
-	for (i = 0; i < 3; i++) {
-		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
-			eth->irq[i] = eth->irq[0];
-		else
-			eth->irq[i] = platform_get_irq(pdev, i);
-		if (eth->irq[i] < 0) {
-			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
-			err = -ENXIO;
-			goto err_wed_exit;
-		}
-	}
+	err = mtk_get_irqs(pdev, eth);
+	if (err)
+		goto err_wed_exit;
+
 	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
 		eth->clks[i] = devm_clk_get(eth->dev,
 					    mtk_clks_source_name[i]);
-- 
2.43.0

Re: [PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Lorenzo Bianconi]

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> From: Frank Wunderlich <frank-w@public-files.de>
> 
> Add named interrupts and keep index based fallback for exiting devicetrees.
> 
> Currently only rx and tx IRQs are defined to be used with mt7988, but
> later extended with RSS/LRO support.
> 
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> Reviewed-by: Simon Horman <horms@kernel.org>

Hi Frank,

I guess my comments on v1 apply even in v2. Can you please take a look?

Regards,
Lorenzo

> ---
> v2:
> - move irqs loading part into own helper function
> - reduce indentation
> - place mtk_get_irqs helper before the irq_handler (note for simon)
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 39 +++++++++++++++------
>  1 file changed, 28 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index b76d35069887..81ae8a6fe838 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -3337,6 +3337,30 @@ static void mtk_tx_timeout(struct net_device *dev, unsigned int txqueue)
>  	schedule_work(&eth->pending_work);
>  }
>  
> +static int mtk_get_irqs(struct platform_device *pdev, struct mtk_eth *eth)
> +{
> +	int i;
> +
> +	eth->irq[1] = platform_get_irq_byname(pdev, "tx");
> +	eth->irq[2] = platform_get_irq_byname(pdev, "rx");
> +	if (eth->irq[1] >= 0 && eth->irq[2] >= 0)
> +		return 0;
> +
> +	for (i = 0; i < 3; i++) {
> +		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> +			eth->irq[i] = eth->irq[0];
> +		else
> +			eth->irq[i] = platform_get_irq(pdev, i);
> +
> +		if (eth->irq[i] < 0) {
> +			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> +			return -ENXIO;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
>  {
>  	struct mtk_eth *eth = _eth;
> @@ -5106,17 +5130,10 @@ static int mtk_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	for (i = 0; i < 3; i++) {
> -		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> -			eth->irq[i] = eth->irq[0];
> -		else
> -			eth->irq[i] = platform_get_irq(pdev, i);
> -		if (eth->irq[i] < 0) {
> -			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> -			err = -ENXIO;
> -			goto err_wed_exit;
> -		}
> -	}
> +	err = mtk_get_irqs(pdev, eth);
> +	if (err)
> +		goto err_wed_exit;
> +
>  	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
>  		eth->clks[i] = devm_clk_get(eth->dev,
>  					    mtk_clks_source_name[i]);
> -- 
> 2.43.0
> 

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Re: [PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Daniel Golle]

On Sun, Jun 15, 2025 at 10:45:19AM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@public-files.de>
> 
> Add named interrupts and keep index based fallback for exiting devicetrees.
> 
> Currently only rx and tx IRQs are defined to be used with mt7988, but
> later extended with RSS/LRO support.
> 
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> Reviewed-by: Simon Horman <horms@kernel.org>
> ---
> v2:
> - move irqs loading part into own helper function
> - reduce indentation
> - place mtk_get_irqs helper before the irq_handler (note for simon)
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 39 +++++++++++++++------
>  1 file changed, 28 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index b76d35069887..81ae8a6fe838 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -3337,6 +3337,30 @@ static void mtk_tx_timeout(struct net_device *dev, unsigned int txqueue)
>  	schedule_work(&eth->pending_work);
>  }
>  
> +static int mtk_get_irqs(struct platform_device *pdev, struct mtk_eth *eth)
> +{
> +	int i;
> +
> +	eth->irq[1] = platform_get_irq_byname(pdev, "tx");
> +	eth->irq[2] = platform_get_irq_byname(pdev, "rx");

In addition to Lorenzo's comment to reduce the array to the actually used
IRQs, I think it would be nice to introduce precompiler macros for the irq
array index, ie. once the array is reduce to size 2 it could be something
like

#define MTK_ETH_IRQ_SHARED 0
#define MTK_ETH_IRQ_TX 0
#define MTK_ETH_IRQ_RX 1
#define __MTK_ETH_IRQ_MAX MTK_ETH_IRQ_RX

That would make all the IRQ code more readable than having to deal with
numerical values.

> +	if (eth->irq[1] >= 0 && eth->irq[2] >= 0)
> +		return 0;
> +
> +	for (i = 0; i < 3; i++) {
> +		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> +			eth->irq[i] = eth->irq[0];
> +		else
> +			eth->irq[i] = platform_get_irq(pdev, i);
> +
> +		if (eth->irq[i] < 0) {
> +			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> +			return -ENXIO;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
>  {
>  	struct mtk_eth *eth = _eth;
> @@ -5106,17 +5130,10 @@ static int mtk_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	for (i = 0; i < 3; i++) {
> -		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> -			eth->irq[i] = eth->irq[0];
> -		else
> -			eth->irq[i] = platform_get_irq(pdev, i);
> -		if (eth->irq[i] < 0) {
> -			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> -			err = -ENXIO;
> -			goto err_wed_exit;
> -		}
> -	}
> +	err = mtk_get_irqs(pdev, eth);
> +	if (err)
> +		goto err_wed_exit;
> +
>  	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
>  		eth->clks[i] = devm_clk_get(eth->dev,
>  					    mtk_clks_source_name[i]);
> -- 
> 2.43.0
> 

Re: [PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Frank Wunderlich (linux)]

Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
>> From: Frank Wunderlich <frank-w@public-files.de>
>> 
>> Add named interrupts and keep index based fallback for exiting 
>> devicetrees.
>> 
>> Currently only rx and tx IRQs are defined to be used with mt7988, but
>> later extended with RSS/LRO support.
>> 
>> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
>> Reviewed-by: Simon Horman <horms@kernel.org>
> 
> Hi Frank,
> 
> I guess my comments on v1 apply even in v2. Can you please take a look?

adding your comments (and mine as context) from v1 here:

Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
>> From: Frank Wunderlich <frank-w@public-files.de>

>> I had to leave flow compatible with this:
>> 
>> <https://github.com/frank-w/BPI-Router-Linux/blob/bd7e1983b9f0a69cf47cc9b9631138910d6c1d72/drivers/net/ethernet/mediatek/mtk_eth_soc.c#L5176>
> 
> I guess the best would be to start from 0 even here (and wherever it is
> necessary) and avoid reading current irq[0] since it is not actually 
> used for
> !shared_int devices (e.g. MT7988).  Agree?
> 
>> 
>> Here the irqs are taken from index 1 and 2 for
>>  registration (!shared_int else only 0). So i avoided changing the
>>  index,but yes index 0 is unset at this time.
>> 
>> I guess the irq0 is not really used here...
>> I tested the code on bpi-r4 and have traffic
>>  rx+tx and no crash.
>>  imho this field is not used on !shared_int
>>  because other irq-handlers are used and
>>  assigned in position above.
> 
> agree. I have not reviewed the code in detail, but this is why
> I think we can avoid reading it.

i areee, but imho it should be a separate patch because these are 2 
different changes

>> It looks like the irq[0] is read before...there is a
>>  message printed for mediatek frame engine
>>  which uses index 0 and shows an irq 102 on
>>  index way and 0 on named version...but the
>>  102 in index way is not visible in /proc/interrupts.
>> So imho this message is misleading.
>> 
>> Intention for this patch is that irq 0 and 3 on
>>  mt7988 (sdk) are reserved (0 is skipped on
>> !shared_int and 3 never read) and should imho
>>  not listed in devicetree. For further cleaner
>>  devicetrees (with only needed irqs) and to
>>  extend additional irqs for rss/lro imho irq
>>  names make it better readable.
> 
> Same here, if you are not listing them in the device tree, you can 
> remove them
> in the driver too (and adjust the code to keep the backward 
> compatibility).

afaik i have no SHARED_INT board (only mt7621, mt7628) so changing the 
index-logic will require testing on such boards too.

i looked a bit into it and see mt7623 and mt7622 have 3 IRQs defined 
(!SHARED_INT) and i'm not 100% sure if the first is also skipped (as far 
as i understood code it should always be skipped).

In the end i would change the irq-index part in separate patch once this 
is accepted to have clean changes and not mixing index with names (at 
least to allow a revert of second in case of regression).

Am 2025-06-15 11:26, schrieb Daniel Golle:
> In addition to Lorenzo's comment to reduce the array to the actually 
> used
> IRQs, I think it would be nice to introduce precompiler macros for the 
> irq
> array index, ie. once the array is reduce to size 2 it could be 
> something
> like
> 
> #define MTK_ETH_IRQ_SHARED 0
> #define MTK_ETH_IRQ_TX 0
> #define MTK_ETH_IRQ_RX 1
> #define __MTK_ETH_IRQ_MAX MTK_ETH_IRQ_RX
> 
> That would make all the IRQ code more readable than having to deal with
> numerical values.

makes sense, i will take this into the second patch.

I hope you can agree my thoughts about not mixing these 2 parts :)

regards Frank

Re: [PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Lorenzo Bianconi]

[-- Attachment #1: Type: text/plain, Size: 4210 bytes --]

> Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
> > > From: Frank Wunderlich <frank-w@public-files.de>
> > > 
> > > Add named interrupts and keep index based fallback for exiting
> > > devicetrees.
> > > 
> > > Currently only rx and tx IRQs are defined to be used with mt7988, but
> > > later extended with RSS/LRO support.
> > > 
> > > Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> > > Reviewed-by: Simon Horman <horms@kernel.org>
> > 
> > Hi Frank,
> > 
> > I guess my comments on v1 apply even in v2. Can you please take a look?

sure

> 
> adding your comments (and mine as context) from v1 here:
> 
> Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
> > > From: Frank Wunderlich <frank-w@public-files.de>
> 
> > > I had to leave flow compatible with this:
> > > 
> > > <https://github.com/frank-w/BPI-Router-Linux/blob/bd7e1983b9f0a69cf47cc9b9631138910d6c1d72/drivers/net/ethernet/mediatek/mtk_eth_soc.c#L5176>
> > 
> > I guess the best would be to start from 0 even here (and wherever it is
> > necessary) and avoid reading current irq[0] since it is not actually
> > used for
> > !shared_int devices (e.g. MT7988).  Agree?
> > 
> > > 
> > > Here the irqs are taken from index 1 and 2 for
> > >  registration (!shared_int else only 0). So i avoided changing the
> > >  index,but yes index 0 is unset at this time.
> > > 
> > > I guess the irq0 is not really used here...
> > > I tested the code on bpi-r4 and have traffic
> > >  rx+tx and no crash.
> > >  imho this field is not used on !shared_int
> > >  because other irq-handlers are used and
> > >  assigned in position above.
> > 
> > agree. I have not reviewed the code in detail, but this is why
> > I think we can avoid reading it.
> 
> i areee, but imho it should be a separate patch because these are 2
> different changes

I am fine to have it in a separate patch but I would prefer to have this patch
in the same series, I think it is more clear.

> 
> > > It looks like the irq[0] is read before...there is a
> > >  message printed for mediatek frame engine
> > >  which uses index 0 and shows an irq 102 on
> > >  index way and 0 on named version...but the
> > >  102 in index way is not visible in /proc/interrupts.
> > > So imho this message is misleading.
> > > 
> > > Intention for this patch is that irq 0 and 3 on
> > >  mt7988 (sdk) are reserved (0 is skipped on
> > > !shared_int and 3 never read) and should imho
> > >  not listed in devicetree. For further cleaner
> > >  devicetrees (with only needed irqs) and to
> > >  extend additional irqs for rss/lro imho irq
> > >  names make it better readable.
> > 
> > Same here, if you are not listing them in the device tree, you can
> > remove them
> > in the driver too (and adjust the code to keep the backward
> > compatibility).
> 
> afaik i have no SHARED_INT board (only mt7621, mt7628) so changing the
> index-logic will require testing on such boards too.

I think the change will not heavily impact SHARED_INT devices.

Regards,
Lorenzo

> 
> i looked a bit into it and see mt7623 and mt7622 have 3 IRQs defined
> (!SHARED_INT) and i'm not 100% sure if the first is also skipped (as far as
> i understood code it should always be skipped).
> 
> In the end i would change the irq-index part in separate patch once this is
> accepted to have clean changes and not mixing index with names (at least to
> allow a revert of second in case of regression).
> 
> Am 2025-06-15 11:26, schrieb Daniel Golle:
> > In addition to Lorenzo's comment to reduce the array to the actually
> > used
> > IRQs, I think it would be nice to introduce precompiler macros for the
> > irq
> > array index, ie. once the array is reduce to size 2 it could be
> > something
> > like
> > 
> > #define MTK_ETH_IRQ_SHARED 0
> > #define MTK_ETH_IRQ_TX 0
> > #define MTK_ETH_IRQ_RX 1
> > #define __MTK_ETH_IRQ_MAX MTK_ETH_IRQ_RX
> > 
> > That would make all the IRQ code more readable than having to deal with
> > numerical values.
> 
> makes sense, i will take this into the second patch.
> 
> I hope you can agree my thoughts about not mixing these 2 parts :)
> 
> regards Frank

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Re: [PATCH v2] net: ethernet: mtk_eth_soc: support named IRQs

[Frank Wunderlich (linux)]

Am 2025-06-15 12:13, schrieb Lorenzo Bianconi:
>> Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
>> > > From: Frank Wunderlich <frank-w@public-files.de>
>> > >
>> > Hi Frank,
>> >
>> > I guess my comments on v1 apply even in v2. Can you please take a look?
> 
> sure

:)

>> Am 2025-06-15 10:57, schrieb Lorenzo Bianconi:
>> > > From: Frank Wunderlich <frank-w@public-files.de>

> I am fine to have it in a separate patch but I would prefer to have 
> this patch
> in the same series, I think it is more clear.

I added changes for your and daniels comments to my repo (top 2 
commits):

https://github.com/frank-w/BPI-Router-Linux/commits/6.16-mt7988upstream/

i would squash daniels suggestions in this patch here (MAX without __ 
and fixed
value of 3 to use for the loop - i guess this was intended for this 
purpose) and
then the change for index in second patch.

>> > Same here, if you are not listing them in the device tree, you can
>> > remove them
>> > in the driver too (and adjust the code to keep the backward
>> > compatibility).

i plan to use named IRQs on mt7988 without the reserved ones (only rx+tx 
+ RSS IRQs),
and loading not index based.

>> afaik i have no SHARED_INT board (only mt7621, mt7628) so changing the
>> index-logic will require testing on such boards too.
> 
> I think the change will not heavily impact SHARED_INT devices.

I hope so ;)

> Regards,
> Lorenzo

regards Frank