[PATCH v3] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

[PATCH v3] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

[Sonic Zhang]

From: Sonic Zhang <sonic.zhang@analog.com>

Some synopsys ip implementation doesn't support DMA store and forward mode,
such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds only.
Update document and devicetree as well.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
---
 Documentation/devicetree/bindings/net/stmmac.txt      | 2 ++
 Documentation/networking/stmmac.txt                   | 3 +++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 4 +++-
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +++
 include/linux/stmmac.h                                | 1 +
 5 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index 261c563..56fbcb5 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -22,6 +22,8 @@ Required properties:
 - snps,pbl		Programmable Burst Length
 - snps,fixed-burst	Program the DMA to use the fixed burst mode
 - snps,mixed-burst	Program the DMA to use the mixed burst mode
+- snps,force_thresh_dma_mode	Force DMA to use the Shreshold mode other than
+				the Store and Forward mode.
 
 Optional properties:
 - mac-address: 6 bytes, mac address
diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
index 654d2e5..457b8bb 100644
--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt
@@ -123,6 +123,7 @@ struct plat_stmmacenet_data {
 	int bugged_jumbo;
 	int pmt;
 	int force_sf_dma_mode;
+	int force_thresh_dma_mode;
 	int riwt_off;
 	void (*fix_mac_speed)(void *priv, unsigned int speed);
 	void (*bus_setup)(void __iomem *ioaddr);
@@ -159,6 +160,8 @@ Where:
  o pmt: core has the embedded power module (optional).
  o force_sf_dma_mode: force DMA to use the Store and Forward mode
 		     instead of the Threshold.
+ o force_thresh_dma_mode: force DMA to use the Shreshold mode other than
+		     the Store and Forward mode.
  o riwt_off: force to disable the RX watchdog feature and switch to NAPI mode.
  o fix_mac_speed: this callback is used for modifying some syscfg registers
 		 (on ST SoCs) according to the link speed negotiated by the
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index be40691..8d4ccd3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1224,7 +1224,9 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
  */
 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 {
-	if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
+	if (priv->plat->force_thresh_dma_mode)
+		priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
+	else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
 		/*
 		 * In case of GMAC, SF mode can be enabled
 		 * to perform the TX COE in HW. This depends on:
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index da8be6e..865c944 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -79,6 +79,9 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
 	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
 	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
 	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
+	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
+	if (plat->force_thresh_dma_mode)
+		plat->force_sf_dma_mode = 0;
 
 	return 0;
 }
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 9e495d31..bb5deb0 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -108,6 +108,7 @@ struct plat_stmmacenet_data {
 	int bugged_jumbo;
 	int pmt;
 	int force_sf_dma_mode;
+	int force_thresh_dma_mode;
 	int riwt_off;
 	void (*fix_mac_speed)(void *priv, unsigned int speed);
 	void (*bus_setup)(void __iomem *ioaddr);
-- 
1.8.2.3

Re: [PATCH v3] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

[Giuseppe CAVALLARO]

hello some comments below

On 8/28/2013 7:40 AM, Sonic Zhang wrote:
> From: Sonic Zhang <sonic.zhang@analog.com>
>
> Some synopsys ip implementation doesn't support DMA store and forward mode,
> such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds only.
> Update document and devicetree as well.
>
> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
> ---
>   Documentation/devicetree/bindings/net/stmmac.txt      | 2 ++
>   Documentation/networking/stmmac.txt                   | 3 +++
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 4 +++-
>   drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +++
>   include/linux/stmmac.h                                | 1 +
>   5 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index 261c563..56fbcb5 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -22,6 +22,8 @@ Required properties:
>   - snps,pbl		Programmable Burst Length
>   - snps,fixed-burst	Program the DMA to use the fixed burst mode
>   - snps,mixed-burst	Program the DMA to use the mixed burst mode
> +- snps,force_thresh_dma_mode	Force DMA to use the Shreshold mode other than

                                                      ^^^^^^^^^ typo


> +				the Store and Forward mode.

if we use this approach you should document that the 
force_thresh_dma_mode and force_sf_dma_mode will force the mode for both 
tx and rx.

I am wondering now what happens if these are passed together from the
platform? is your code covering this scenario?

we could have a unique force_dma_mode that can be:

    rx_force_threshold
    tx_force_threshold
    rx_force_sf
    tx_force_sf
               ( these can be defined in the stmmac.h platform header )

but this an impact on all the platforms that already use the 
force_sf_dma_mode as we said

In this case you should fix this and maybe the patch should be for 
net-next (add it in the subject next time).

>
>   Optional properties:
>   - mac-address: 6 bytes, mac address
> diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
> index 654d2e5..457b8bb 100644
> --- a/Documentation/networking/stmmac.txt
> +++ b/Documentation/networking/stmmac.txt
> @@ -123,6 +123,7 @@ struct plat_stmmacenet_data {
>   	int bugged_jumbo;
>   	int pmt;
>   	int force_sf_dma_mode;
> +	int force_thresh_dma_mode;
>   	int riwt_off;
>   	void (*fix_mac_speed)(void *priv, unsigned int speed);
>   	void (*bus_setup)(void __iomem *ioaddr);
> @@ -159,6 +160,8 @@ Where:
>    o pmt: core has the embedded power module (optional).
>    o force_sf_dma_mode: force DMA to use the Store and Forward mode
>   		     instead of the Threshold.
> + o force_thresh_dma_mode: force DMA to use the Shreshold mode other than
> +		     the Store and Forward mode.
>    o riwt_off: force to disable the RX watchdog feature and switch to NAPI mode.
>    o fix_mac_speed: this callback is used for modifying some syscfg registers
>   		 (on ST SoCs) according to the link speed negotiated by the
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index be40691..8d4ccd3 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1224,7 +1224,9 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
>    */
>   static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
>   {
> -	if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
> +	if (priv->plat->force_thresh_dma_mode)
> +		priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
> +	else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
>   		/*
>   		 * In case of GMAC, SF mode can be enabled
>   		 * to perform the TX COE in HW. This depends on:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index da8be6e..865c944 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -79,6 +79,9 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
>   	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
>   	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
>   	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
> +	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
> +	if (plat->force_thresh_dma_mode)
> +		plat->force_sf_dma_mode = 0;
>
>   	return 0;
>   }
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index 9e495d31..bb5deb0 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -108,6 +108,7 @@ struct plat_stmmacenet_data {
>   	int bugged_jumbo;
>   	int pmt;
>   	int force_sf_dma_mode;
> +	int force_thresh_dma_mode;
>   	int riwt_off;
>   	void (*fix_mac_speed)(void *priv, unsigned int speed);
>   	void (*bus_setup)(void __iomem *ioaddr);
>

Re: [PATCH v3] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

[Giuseppe CAVALLARO]

hello some comments below

On 8/28/2013 7:40 AM, Sonic Zhang wrote:
> From: Sonic Zhang <sonic.zhang@analog.com>
>
> Some synopsys ip implementation doesn't support DMA store and forward mode,
> such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds only.
> Update document and devicetree as well.
>
> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
> ---
>   Documentation/devicetree/bindings/net/stmmac.txt      | 2 ++
>   Documentation/networking/stmmac.txt                   | 3 +++
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 4 +++-
>   drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +++
>   include/linux/stmmac.h                                | 1 +
>   5 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index 261c563..56fbcb5 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -22,6 +22,8 @@ Required properties:
>   - snps,pbl		Programmable Burst Length
>   - snps,fixed-burst	Program the DMA to use the fixed burst mode
>   - snps,mixed-burst	Program the DMA to use the mixed burst mode
> +- snps,force_thresh_dma_mode	Force DMA to use the Shreshold mode other than

                                                      ^^^^^^^^^ typo


> +				the Store and Forward mode.

if we use this approach you should document that the 
force_thresh_dma_mode and force_sf_dma_mode will force the mode for both 
tx and rx.

I am wondering now what happens if these are passed together from the
platform? is your code covering this scenario?

we could have a unique force_dma_mode that can be:

    rx_force_threshold
    tx_force_threshold
    rx_force_sf
    tx_force_sf
               ( these can be defined in the stmmac.h platform header )

but this an impact on all the platforms that already use the 
force_sf_dma_mode as we said

In this case you should fix this and maybe the patch should be for 
net-next (add it in the subject next time).

peppe

>
>   Optional properties:
>   - mac-address: 6 bytes, mac address
> diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
> index 654d2e5..457b8bb 100644
> --- a/Documentation/networking/stmmac.txt
> +++ b/Documentation/networking/stmmac.txt
> @@ -123,6 +123,7 @@ struct plat_stmmacenet_data {
>   	int bugged_jumbo;
>   	int pmt;
>   	int force_sf_dma_mode;
> +	int force_thresh_dma_mode;
>   	int riwt_off;
>   	void (*fix_mac_speed)(void *priv, unsigned int speed);
>   	void (*bus_setup)(void __iomem *ioaddr);
> @@ -159,6 +160,8 @@ Where:
>    o pmt: core has the embedded power module (optional).
>    o force_sf_dma_mode: force DMA to use the Store and Forward mode
>   		     instead of the Threshold.
> + o force_thresh_dma_mode: force DMA to use the Shreshold mode other than
> +		     the Store and Forward mode.
>    o riwt_off: force to disable the RX watchdog feature and switch to NAPI mode.
>    o fix_mac_speed: this callback is used for modifying some syscfg registers
>   		 (on ST SoCs) according to the link speed negotiated by the
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index be40691..8d4ccd3 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1224,7 +1224,9 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
>    */
>   static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
>   {
> -	if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
> +	if (priv->plat->force_thresh_dma_mode)
> +		priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
> +	else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
>   		/*
>   		 * In case of GMAC, SF mode can be enabled
>   		 * to perform the TX COE in HW. This depends on:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index da8be6e..865c944 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -79,6 +79,9 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
>   	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
>   	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
>   	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
> +	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
> +	if (plat->force_thresh_dma_mode)
> +		plat->force_sf_dma_mode = 0;
>
>   	return 0;
>   }
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index 9e495d31..bb5deb0 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -108,6 +108,7 @@ struct plat_stmmacenet_data {
>   	int bugged_jumbo;
>   	int pmt;
>   	int force_sf_dma_mode;
> +	int force_thresh_dma_mode;
>   	int riwt_off;
>   	void (*fix_mac_speed)(void *priv, unsigned int speed);
>   	void (*bus_setup)(void __iomem *ioaddr);
>

Re: [PATCH v3] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

[Sonic Zhang]

Hi Peppe,

On Wed, Aug 28, 2013 at 5:17 PM, Giuseppe CAVALLARO
<peppe.cavallaro@st.com> wrote:
> hello some comments below
>
> On 8/28/2013 7:40 AM, Sonic Zhang wrote:
>>
>> From: Sonic Zhang <sonic.zhang@analog.com>
>>
>> Some synopsys ip implementation doesn't support DMA store and forward
>> mode,
>> such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds only.
>> Update document and devicetree as well.
>>
>> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
>> ---
>>   Documentation/devicetree/bindings/net/stmmac.txt      | 2 ++
>>   Documentation/networking/stmmac.txt                   | 3 +++
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 4 +++-
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +++
>>   include/linux/stmmac.h                                | 1 +
>>   5 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt
>> b/Documentation/devicetree/bindings/net/stmmac.txt
>> index 261c563..56fbcb5 100644
>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>> @@ -22,6 +22,8 @@ Required properties:
>>   - snps,pbl            Programmable Burst Length
>>   - snps,fixed-burst    Program the DMA to use the fixed burst mode
>>   - snps,mixed-burst    Program the DMA to use the mixed burst mode
>> +- snps,force_thresh_dma_mode   Force DMA to use the Shreshold mode other
>> than
>
>
>                                                      ^^^^^^^^^ typo
>
>
>
>> +                               the Store and Forward mode.
>
>
> if we use this approach you should document that the force_thresh_dma_mode
> and force_sf_dma_mode will force the mode for both tx and rx.

OK

>
> I am wondering now what happens if these are passed together from the
> platform? is your code covering this scenario?

Yes, in case both are set, I unset flag force_sf_dma_mode. So, only
force_thresh_dma_mode takes effect.

>
> we could have a unique force_dma_mode that can be:
>
>    rx_force_threshold
>    tx_force_threshold
>    rx_force_sf
>    tx_force_sf
>               ( these can be defined in the stmmac.h platform header )
>
> but this an impact on all the platforms that already use the
> force_sf_dma_mode as we said

So, I prefer current 2-flag solution.

>
> In this case you should fix this and maybe the patch should be for net-next
> (add it in the subject next time).

I will add "for net-next" to the subject.

>
> peppe
>
>
>>
>>   Optional properties:
>>   - mac-address: 6 bytes, mac address
>> diff --git a/Documentation/networking/stmmac.txt
>> b/Documentation/networking/stmmac.txt
>> index 654d2e5..457b8bb 100644
>> --- a/Documentation/networking/stmmac.txt
>> +++ b/Documentation/networking/stmmac.txt
>> @@ -123,6 +123,7 @@ struct plat_stmmacenet_data {
>>         int bugged_jumbo;
>>         int pmt;
>>         int force_sf_dma_mode;
>> +       int force_thresh_dma_mode;
>>         int riwt_off;
>>         void (*fix_mac_speed)(void *priv, unsigned int speed);
>>         void (*bus_setup)(void __iomem *ioaddr);
>> @@ -159,6 +160,8 @@ Where:
>>    o pmt: core has the embedded power module (optional).
>>    o force_sf_dma_mode: force DMA to use the Store and Forward mode
>>                      instead of the Threshold.
>> + o force_thresh_dma_mode: force DMA to use the Shreshold mode other than
>> +                    the Store and Forward mode.
>>    o riwt_off: force to disable the RX watchdog feature and switch to NAPI
>> mode.
>>    o fix_mac_speed: this callback is used for modifying some syscfg
>> registers
>>                  (on ST SoCs) according to the link speed negotiated by
>> the
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index be40691..8d4ccd3 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -1224,7 +1224,9 @@ static void free_dma_desc_resources(struct
>> stmmac_priv *priv)
>>    */
>>   static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
>>   {
>> -       if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
>> +       if (priv->plat->force_thresh_dma_mode)
>> +               priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
>> +       else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
>>                 /*
>>                  * In case of GMAC, SF mode can be enabled
>>                  * to perform the TX COE in HW. This depends on:
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index da8be6e..865c944 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -79,6 +79,9 @@ static int stmmac_probe_config_dt(struct platform_device
>> *pdev,
>>         of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
>>         dma_cfg->fixed_burst = of_property_read_bool(np,
>> "snps,fixed-burst");
>>         dma_cfg->mixed_burst = of_property_read_bool(np,
>> "snps,mixed-burst");
>> +       plat->force_thresh_dma_mode = of_property_read_bool(np,
>> "snps,force_thresh_dma_mode");
>> +       if (plat->force_thresh_dma_mode)
>> +               plat->force_sf_dma_mode = 0;
>>
>>         return 0;
>>   }
>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>> index 9e495d31..bb5deb0 100644
>> --- a/include/linux/stmmac.h
>> +++ b/include/linux/stmmac.h
>> @@ -108,6 +108,7 @@ struct plat_stmmacenet_data {
>>         int bugged_jumbo;
>>         int pmt;
>>         int force_sf_dma_mode;
>> +       int force_thresh_dma_mode;
>>         int riwt_off;
>>         void (*fix_mac_speed)(void *priv, unsigned int speed);
>>         void (*bus_setup)(void __iomem *ioaddr);
>>
>