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[net-next,v3,2/5] net: pcs: xpcs: combine C37 SGMII AN and 2500BASEX for Intel mGbE controller

Message ID 20230921121946.3025771-3-yong.liang.choong@linux.intel.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series TSN auto negotiation between 1G and 2.5G | expand

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Commit Message

Choong Yong Liang Sept. 21, 2023, 12:19 p.m. UTC 
From: "Tan, Tee Min" <tee.min.tan@linux.intel.com>

This commit introduces xpcs_sgmii_2500basex_features[] that combine
xpcs_sgmii_features[] and xpcs_2500basex_features[] for Intel mGbE
controller that desire to interchange the speed mode of
10/100/1000/2500Mbps at runtime.

Also, we introduce xpcs_config_aneg_c37_sgmii_2500basex() function
which is called by the xpcs_do_config() with the new AN mode:
DW_SGMII_2500BASEX, and this new function will proceed next-level
calling to perform C37 SGMII AN/2500BASEX configuration based on
the PHY interface updated by PHY driver.

Signed-off-by: Tan, Tee Min <tee.min.tan@linux.intel.com>
Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
---
 drivers/net/pcs/pcs-xpcs.c   | 72 ++++++++++++++++++++++++++++++------
 include/linux/pcs/pcs-xpcs.h |  1 +
 2 files changed, 62 insertions(+), 11 deletions(-)

Comments

Russell King (Oracle) Sept. 21, 2023, 1:06 p.m. UTC | #1 
On Thu, Sep 21, 2023 at 08:19:43PM +0800, Choong Yong Liang wrote:
> From: "Tan, Tee Min" <tee.min.tan@linux.intel.com>
> 
> This commit introduces xpcs_sgmii_2500basex_features[] that combine
> xpcs_sgmii_features[] and xpcs_2500basex_features[] for Intel mGbE
> controller that desire to interchange the speed mode of
> 10/100/1000/2500Mbps at runtime.
> 
> Also, we introduce xpcs_config_aneg_c37_sgmii_2500basex() function

Clause 37... SGMII? 2500base-X? Technically, clause 37 doesn't cover
2500base-X.

> which is called by the xpcs_do_config() with the new AN mode:
> DW_SGMII_2500BASEX, and this new function will proceed next-level
> calling to perform C37 SGMII AN/2500BASEX configuration based on
> the PHY interface updated by PHY driver.
> 
> Signed-off-by: Tan, Tee Min <tee.min.tan@linux.intel.com>
> Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
> ---
>  drivers/net/pcs/pcs-xpcs.c   | 72 ++++++++++++++++++++++++++++++------
>  include/linux/pcs/pcs-xpcs.h |  1 +
>  2 files changed, 62 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 4dbc21f604f2..60d90191677d 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -104,6 +104,21 @@ static const int xpcs_2500basex_features[] = {
>  	__ETHTOOL_LINK_MODE_MASK_NBITS,
>  };
>  
> +static const int xpcs_sgmii_2500basex_features[] = {
> +	ETHTOOL_LINK_MODE_Pause_BIT,
> +	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> +	ETHTOOL_LINK_MODE_Autoneg_BIT,
> +	ETHTOOL_LINK_MODE_10baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_10baseT_Full_BIT,
> +	ETHTOOL_LINK_MODE_100baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_100baseT_Full_BIT,
> +	ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_1000baseT_Full_BIT,

The connected PHY could be one that supports 1000baseX as well.

> +	ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
> +	ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
> +	__ETHTOOL_LINK_MODE_MASK_NBITS,
> +};
> +
>  static const phy_interface_t xpcs_usxgmii_interfaces[] = {
>  	PHY_INTERFACE_MODE_USXGMII,
>  };
> @@ -133,6 +148,12 @@ static const phy_interface_t xpcs_2500basex_interfaces[] = {
>  	PHY_INTERFACE_MODE_MAX,
>  };
>  
> +static const phy_interface_t xpcs_sgmii_2500basex_interfaces[] = {
> +	PHY_INTERFACE_MODE_SGMII,
> +	PHY_INTERFACE_MODE_2500BASEX,
> +	PHY_INTERFACE_MODE_MAX,
> +};
> +
>  enum {
>  	DW_XPCS_USXGMII,
>  	DW_XPCS_10GKR,
> @@ -141,6 +162,7 @@ enum {
>  	DW_XPCS_SGMII,
>  	DW_XPCS_1000BASEX,
>  	DW_XPCS_2500BASEX,
> +	DW_XPCS_SGMII_2500BASEX,
>  	DW_XPCS_INTERFACE_MAX,
>  };
>  
> @@ -290,6 +312,7 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
>  	case DW_AN_C37_SGMII:
>  	case DW_2500BASEX:
>  	case DW_AN_C37_1000BASEX:
> +	case DW_SGMII_2500BASEX:
>  		dev = MDIO_MMD_VEND2;
>  		break;
>  	default:
> @@ -748,6 +771,8 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
>  	if (xpcs->dev_flag == DW_DEV_TXGBE)
>  		ret |= DW_VR_MII_DIG_CTRL1_PHY_MODE_CTRL;
>  
> +	/* Disable 2.5G GMII for SGMII C37 mode */
> +	ret &= ~DW_VR_MII_DIG_CTRL1_2G5_EN;

Do you know that this is correct for every user of this function?

>  	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
>  	if (ret < 0)
>  		return ret;
> @@ -848,6 +873,26 @@ static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
>  	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL, ret);
>  }
>  
> +static int xpcs_config_aneg_c37_sgmii_2500basex(struct dw_xpcs *xpcs,
> +						unsigned int neg_mode,
> +						phy_interface_t interface)
> +{
> +	int ret = -EOPNOTSUPP;
> +
> +	switch (interface) {
> +	case PHY_INTERFACE_MODE_SGMII:
> +		ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
> +		break;
> +	case PHY_INTERFACE_MODE_2500BASEX:
> +		ret = xpcs_config_2500basex(xpcs);
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
>  int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>  		   const unsigned long *advertising, unsigned int neg_mode)
>  {
> @@ -890,6 +935,12 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>  		if (ret)
>  			return ret;
>  		break;
> +	case DW_SGMII_2500BASEX:
> +		ret = xpcs_config_aneg_c37_sgmii_2500basex(xpcs, neg_mode,
> +							   interface);
> +		if (ret)
> +			return ret;
> +		break;
>  	default:
>  		return -1;
>  	}
> @@ -1114,6 +1165,11 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
>  		}
>  		break;
>  	case DW_AN_C37_SGMII:
> +	case DW_SGMII_2500BASEX:
> +		/* 2500BASEX is not supported for in-band AN mode. */
> +		if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
> +			break;
> +
>  		ret = xpcs_get_state_c37_sgmii(xpcs, state);
>  		if (ret) {
>  			pr_err("xpcs_get_state_c37_sgmii returned %pe\n",
> @@ -1266,23 +1322,17 @@ static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
>  		.num_interfaces = ARRAY_SIZE(xpcs_10gbaser_interfaces),
>  		.an_mode = DW_10GBASER,
>  	},
> -	[DW_XPCS_SGMII] = {
> -		.supported = xpcs_sgmii_features,
> -		.interface = xpcs_sgmii_interfaces,
> -		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
> -		.an_mode = DW_AN_C37_SGMII,
> -	},

Doesn't this break SGMII-only support (those using DW_XPCS_SGMII) ?

>  	[DW_XPCS_1000BASEX] = {
>  		.supported = xpcs_1000basex_features,
>  		.interface = xpcs_1000basex_interfaces,
>  		.num_interfaces = ARRAY_SIZE(xpcs_1000basex_interfaces),
>  		.an_mode = DW_AN_C37_1000BASEX,
>  	},
> -	[DW_XPCS_2500BASEX] = {
> -		.supported = xpcs_2500basex_features,
> -		.interface = xpcs_2500basex_interfaces,
> -		.num_interfaces = ARRAY_SIZE(xpcs_2500basex_interfaces),
> -		.an_mode = DW_2500BASEX,

Doesn't this break 2500base-X only support (those using
DW_XPCS_2500BASEX)?

> +	[DW_XPCS_SGMII_2500BASEX] = {
> +		.supported = xpcs_sgmii_2500basex_features,
> +		.interface = xpcs_sgmii_2500basex_interfaces,
> +		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_2500basex_features),
> +		.an_mode = DW_SGMII_2500BASEX,
>  	},
>  };
>  
> diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
> index da3a6c30f6d2..f075d2fca54a 100644
> --- a/include/linux/pcs/pcs-xpcs.h
> +++ b/include/linux/pcs/pcs-xpcs.h
> @@ -19,6 +19,7 @@
>  #define DW_2500BASEX			3
>  #define DW_AN_C37_1000BASEX		4
>  #define DW_10GBASER			5
> +#define DW_SGMII_2500BASEX		6
>  
>  /* device vendor OUI */
>  #define DW_OUI_WX			0x0018fc80
> -- 
> 2.25.1
> 
>
Serge Semin Sept. 26, 2023, 10:51 a.m. UTC | #2 
Hi Choong

On Thu, Sep 21, 2023 at 08:19:43PM +0800, Choong Yong Liang wrote:
> From: "Tan, Tee Min" <tee.min.tan@linux.intel.com>
> 
> This commit introduces xpcs_sgmii_2500basex_features[] that combine
> xpcs_sgmii_features[] and xpcs_2500basex_features[] for Intel mGbE
> controller that desire to interchange the speed mode of
> 10/100/1000/2500Mbps at runtime.
> 
> Also, we introduce xpcs_config_aneg_c37_sgmii_2500basex() function
> which is called by the xpcs_do_config() with the new AN mode:
> DW_SGMII_2500BASEX, and this new function will proceed next-level
> calling to perform C37 SGMII AN/2500BASEX configuration based on
> the PHY interface updated by PHY driver.

Why do you even need all of those changes? Please thoroughly justify
because ... (see below)

> 
> Signed-off-by: Tan, Tee Min <tee.min.tan@linux.intel.com>
> Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
> ---
>  drivers/net/pcs/pcs-xpcs.c   | 72 ++++++++++++++++++++++++++++++------
>  include/linux/pcs/pcs-xpcs.h |  1 +
>  2 files changed, 62 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 4dbc21f604f2..60d90191677d 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -104,6 +104,21 @@ static const int xpcs_2500basex_features[] = {
>  	__ETHTOOL_LINK_MODE_MASK_NBITS,
>  };
>  

> +static const int xpcs_sgmii_2500basex_features[] = {
> +	ETHTOOL_LINK_MODE_Pause_BIT,
> +	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> +	ETHTOOL_LINK_MODE_Autoneg_BIT,
> +	ETHTOOL_LINK_MODE_10baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_10baseT_Full_BIT,
> +	ETHTOOL_LINK_MODE_100baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_100baseT_Full_BIT,
> +	ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
> +	ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
> +	ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
> +	ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
> +	__ETHTOOL_LINK_MODE_MASK_NBITS,
> +};
> +
>  static const phy_interface_t xpcs_usxgmii_interfaces[] = {
>  	PHY_INTERFACE_MODE_USXGMII,
>  };
> @@ -133,6 +148,12 @@ static const phy_interface_t xpcs_2500basex_interfaces[] = {
>  	PHY_INTERFACE_MODE_MAX,
>  };
>  
> +static const phy_interface_t xpcs_sgmii_2500basex_interfaces[] = {
> +	PHY_INTERFACE_MODE_SGMII,
> +	PHY_INTERFACE_MODE_2500BASEX,
> +	PHY_INTERFACE_MODE_MAX,
> +};
> +

... these are just a combination of the
xpcs_sgmii_features[]/xpcs_sgmii_interfaces[] and
xpcs_2500basex_features[]/xpcs_2500basex_interfaces[] data which are
already supported by the generic DW XPCS code. All of these features
and interfaces are checked in the xpcs_create() method and then get to
be combined in the framework of the xpcs_validate() and
xpcs_get_interfaces() functions. And ...

>  enum {
>  	DW_XPCS_USXGMII,
>  	DW_XPCS_10GKR,
> @@ -141,6 +162,7 @@ enum {
>  	DW_XPCS_SGMII,
>  	DW_XPCS_1000BASEX,
>  	DW_XPCS_2500BASEX,
> +	DW_XPCS_SGMII_2500BASEX,
>  	DW_XPCS_INTERFACE_MAX,
>  };
>  
> @@ -290,6 +312,7 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
>  	case DW_AN_C37_SGMII:
>  	case DW_2500BASEX:
>  	case DW_AN_C37_1000BASEX:
> +	case DW_SGMII_2500BASEX:
>  		dev = MDIO_MMD_VEND2;
>  		break;
>  	default:
> @@ -748,6 +771,8 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
>  	if (xpcs->dev_flag == DW_DEV_TXGBE)
>  		ret |= DW_VR_MII_DIG_CTRL1_PHY_MODE_CTRL;
>  

> +	/* Disable 2.5G GMII for SGMII C37 mode */
> +	ret &= ~DW_VR_MII_DIG_CTRL1_2G5_EN;

* This is the only specific change in this patch. But it can be
* applied independently from the rest of the changes. Although I agree
* with Russel, it must be double checked since may cause regressions
* on the other platforms.

>  	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
>  	if (ret < 0)
>  		return ret;
> @@ -848,6 +873,26 @@ static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
>  	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL, ret);
>  }
>  

> +static int xpcs_config_aneg_c37_sgmii_2500basex(struct dw_xpcs *xpcs,
> +						unsigned int neg_mode,
> +						phy_interface_t interface)
> +{
> +	int ret = -EOPNOTSUPP;
> +
> +	switch (interface) {
> +	case PHY_INTERFACE_MODE_SGMII:
> +		ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
> +		break;
> +	case PHY_INTERFACE_MODE_2500BASEX:
> +		ret = xpcs_config_2500basex(xpcs);
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return ret;
> +}
> +

... this is just a copy of the code which is already available in xpcs_do_config():

<        compat = xpcs_find_compat(xpcs->id, interface);
<        if (!compat)
<                return -ENODEV;
<
<        switch (compat->an_mode) {
< ...
<        case DW_AN_C37_SGMII:
<                ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
<                if (ret)
<                        return ret;
<                break;
< ...
<        case DW_2500BASEX:
<                ret = xpcs_config_2500basex(xpcs);
<                if (ret)
<                        return ret;
<                break;

So based on the passed interface xpcs_find_compat() will find a proper
compat descriptor, which an_mode field will be then utilized to call
the respective config method. Thus, unless I miss something, basically
you won't need any of the changes below and the most of the changes
above reducing the patch to just a few lines.

-Serge(y)

>  int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>  		   const unsigned long *advertising, unsigned int neg_mode)
>  {
> @@ -890,6 +935,12 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>  		if (ret)
>  			return ret;
>  		break;
> +	case DW_SGMII_2500BASEX:
> +		ret = xpcs_config_aneg_c37_sgmii_2500basex(xpcs, neg_mode,
> +							   interface);
> +		if (ret)
> +			return ret;
> +		break;
>  	default:
>  		return -1;
>  	}
> @@ -1114,6 +1165,11 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
>  		}
>  		break;
>  	case DW_AN_C37_SGMII:
> +	case DW_SGMII_2500BASEX:
> +		/* 2500BASEX is not supported for in-band AN mode. */
> +		if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
> +			break;
> +
>  		ret = xpcs_get_state_c37_sgmii(xpcs, state);
>  		if (ret) {
>  			pr_err("xpcs_get_state_c37_sgmii returned %pe\n",
> @@ -1266,23 +1322,17 @@ static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
>  		.num_interfaces = ARRAY_SIZE(xpcs_10gbaser_interfaces),
>  		.an_mode = DW_10GBASER,
>  	},
> -	[DW_XPCS_SGMII] = {
> -		.supported = xpcs_sgmii_features,
> -		.interface = xpcs_sgmii_interfaces,
> -		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
> -		.an_mode = DW_AN_C37_SGMII,
> -	},
>  	[DW_XPCS_1000BASEX] = {
>  		.supported = xpcs_1000basex_features,
>  		.interface = xpcs_1000basex_interfaces,
>  		.num_interfaces = ARRAY_SIZE(xpcs_1000basex_interfaces),
>  		.an_mode = DW_AN_C37_1000BASEX,
>  	},
> -	[DW_XPCS_2500BASEX] = {
> -		.supported = xpcs_2500basex_features,
> -		.interface = xpcs_2500basex_interfaces,
> -		.num_interfaces = ARRAY_SIZE(xpcs_2500basex_interfaces),
> -		.an_mode = DW_2500BASEX,
> +	[DW_XPCS_SGMII_2500BASEX] = {
> +		.supported = xpcs_sgmii_2500basex_features,
> +		.interface = xpcs_sgmii_2500basex_interfaces,
> +		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_2500basex_features),
> +		.an_mode = DW_SGMII_2500BASEX,
>  	},
>  };
>  
> diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
> index da3a6c30f6d2..f075d2fca54a 100644
> --- a/include/linux/pcs/pcs-xpcs.h
> +++ b/include/linux/pcs/pcs-xpcs.h
> @@ -19,6 +19,7 @@
>  #define DW_2500BASEX			3
>  #define DW_AN_C37_1000BASEX		4
>  #define DW_10GBASER			5
> +#define DW_SGMII_2500BASEX		6
>  
>  /* device vendor OUI */
>  #define DW_OUI_WX			0x0018fc80
> -- 
> 2.25.1
> 
>
Choong Yong Liang Jan. 29, 2024, 1:15 p.m. UTC | #3 
On 26/9/2023 6:51 pm, Serge Semin wrote:
> Hi Choong
> 
> On Thu, Sep 21, 2023 at 08:19:43PM +0800, Choong Yong Liang wrote:
>> From: "Tan, Tee Min" <tee.min.tan@linux.intel.com>
>>
>> This commit introduces xpcs_sgmii_2500basex_features[] that combine
>> xpcs_sgmii_features[] and xpcs_2500basex_features[] for Intel mGbE
>> controller that desire to interchange the speed mode of
>> 10/100/1000/2500Mbps at runtime.
>>
>> Also, we introduce xpcs_config_aneg_c37_sgmii_2500basex() function
>> which is called by the xpcs_do_config() with the new AN mode:
>> DW_SGMII_2500BASEX, and this new function will proceed next-level
>> calling to perform C37 SGMII AN/2500BASEX configuration based on
>> the PHY interface updated by PHY driver.
> 
> Why do you even need all of those changes? Please thoroughly justify
> because ... (see below)
> 
>>
>> Signed-off-by: Tan, Tee Min <tee.min.tan@linux.intel.com>
>> Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
>> ---
>>   drivers/net/pcs/pcs-xpcs.c   | 72 ++++++++++++++++++++++++++++++------
>>   include/linux/pcs/pcs-xpcs.h |  1 +
>>   2 files changed, 62 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
>> index 4dbc21f604f2..60d90191677d 100644
>> --- a/drivers/net/pcs/pcs-xpcs.c
>> +++ b/drivers/net/pcs/pcs-xpcs.c
>> @@ -104,6 +104,21 @@ static const int xpcs_2500basex_features[] = {
>>   	__ETHTOOL_LINK_MODE_MASK_NBITS,
>>   };
>>   
> 
>> +static const int xpcs_sgmii_2500basex_features[] = {
>> +	ETHTOOL_LINK_MODE_Pause_BIT,
>> +	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
>> +	ETHTOOL_LINK_MODE_Autoneg_BIT,
>> +	ETHTOOL_LINK_MODE_10baseT_Half_BIT,
>> +	ETHTOOL_LINK_MODE_10baseT_Full_BIT,
>> +	ETHTOOL_LINK_MODE_100baseT_Half_BIT,
>> +	ETHTOOL_LINK_MODE_100baseT_Full_BIT,
>> +	ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
>> +	ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
>> +	ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
>> +	ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
>> +	__ETHTOOL_LINK_MODE_MASK_NBITS,
>> +};
>> +
>>   static const phy_interface_t xpcs_usxgmii_interfaces[] = {
>>   	PHY_INTERFACE_MODE_USXGMII,
>>   };
>> @@ -133,6 +148,12 @@ static const phy_interface_t xpcs_2500basex_interfaces[] = {
>>   	PHY_INTERFACE_MODE_MAX,
>>   };
>>   
>> +static const phy_interface_t xpcs_sgmii_2500basex_interfaces[] = {
>> +	PHY_INTERFACE_MODE_SGMII,
>> +	PHY_INTERFACE_MODE_2500BASEX,
>> +	PHY_INTERFACE_MODE_MAX,
>> +};
>> +
> 
> ... these are just a combination of the
> xpcs_sgmii_features[]/xpcs_sgmii_interfaces[] and
> xpcs_2500basex_features[]/xpcs_2500basex_interfaces[] data which are
> already supported by the generic DW XPCS code. All of these features
> and interfaces are checked in the xpcs_create() method and then get to
> be combined in the framework of the xpcs_validate() and
> xpcs_get_interfaces() functions. And ...
> 
>>   enum {
>>   	DW_XPCS_USXGMII,
>>   	DW_XPCS_10GKR,
>> @@ -141,6 +162,7 @@ enum {
>>   	DW_XPCS_SGMII,
>>   	DW_XPCS_1000BASEX,
>>   	DW_XPCS_2500BASEX,
>> +	DW_XPCS_SGMII_2500BASEX,
>>   	DW_XPCS_INTERFACE_MAX,
>>   };
>>   
>> @@ -290,6 +312,7 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
>>   	case DW_AN_C37_SGMII:
>>   	case DW_2500BASEX:
>>   	case DW_AN_C37_1000BASEX:
>> +	case DW_SGMII_2500BASEX:
>>   		dev = MDIO_MMD_VEND2;
>>   		break;
>>   	default:
>> @@ -748,6 +771,8 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
>>   	if (xpcs->dev_flag == DW_DEV_TXGBE)
>>   		ret |= DW_VR_MII_DIG_CTRL1_PHY_MODE_CTRL;
>>   
> 
>> +	/* Disable 2.5G GMII for SGMII C37 mode */
>> +	ret &= ~DW_VR_MII_DIG_CTRL1_2G5_EN;
> 
> * This is the only specific change in this patch. But it can be
> * applied independently from the rest of the changes. Although I agree
> * with Russel, it must be double checked since may cause regressions
> * on the other platforms.
> 
>>   	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
>>   	if (ret < 0)
>>   		return ret;
>> @@ -848,6 +873,26 @@ static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
>>   	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL, ret);
>>   }
>>   
> 
>> +static int xpcs_config_aneg_c37_sgmii_2500basex(struct dw_xpcs *xpcs,
>> +						unsigned int neg_mode,
>> +						phy_interface_t interface)
>> +{
>> +	int ret = -EOPNOTSUPP;
>> +
>> +	switch (interface) {
>> +	case PHY_INTERFACE_MODE_SGMII:
>> +		ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
>> +		break;
>> +	case PHY_INTERFACE_MODE_2500BASEX:
>> +		ret = xpcs_config_2500basex(xpcs);
>> +		break;
>> +	default:
>> +		break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
> 
> ... this is just a copy of the code which is already available in xpcs_do_config():
> 
> <        compat = xpcs_find_compat(xpcs->id, interface);
> <        if (!compat)
> <                return -ENODEV;
> <
> <        switch (compat->an_mode) {
> < ...
> <        case DW_AN_C37_SGMII:
> <                ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
> <                if (ret)
> <                        return ret;
> <                break;
> < ...
> <        case DW_2500BASEX:
> <                ret = xpcs_config_2500basex(xpcs);
> <                if (ret)
> <                        return ret;
> <                break;
> 
> So based on the passed interface xpcs_find_compat() will find a proper
> compat descriptor, which an_mode field will be then utilized to call
> the respective config method. Thus, unless I miss something, basically
> you won't need any of the changes below and the most of the changes
> above reducing the patch to just a few lines.
> 
> -Serge(y)
> 
>>   int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>>   		   const unsigned long *advertising, unsigned int neg_mode)
>>   {
>> @@ -890,6 +935,12 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
>>   		if (ret)
>>   			return ret;
>>   		break;
>> +	case DW_SGMII_2500BASEX:
>> +		ret = xpcs_config_aneg_c37_sgmii_2500basex(xpcs, neg_mode,
>> +							   interface);
>> +		if (ret)
>> +			return ret;
>> +		break;
>>   	default:
>>   		return -1;
>>   	}
>> @@ -1114,6 +1165,11 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
>>   		}
>>   		break;
>>   	case DW_AN_C37_SGMII:
>> +	case DW_SGMII_2500BASEX:
>> +		/* 2500BASEX is not supported for in-band AN mode. */
>> +		if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
>> +			break;
>> +
>>   		ret = xpcs_get_state_c37_sgmii(xpcs, state);
>>   		if (ret) {
>>   			pr_err("xpcs_get_state_c37_sgmii returned %pe\n",
>> @@ -1266,23 +1322,17 @@ static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
>>   		.num_interfaces = ARRAY_SIZE(xpcs_10gbaser_interfaces),
>>   		.an_mode = DW_10GBASER,
>>   	},
>> -	[DW_XPCS_SGMII] = {
>> -		.supported = xpcs_sgmii_features,
>> -		.interface = xpcs_sgmii_interfaces,
>> -		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
>> -		.an_mode = DW_AN_C37_SGMII,
>> -	},
>>   	[DW_XPCS_1000BASEX] = {
>>   		.supported = xpcs_1000basex_features,
>>   		.interface = xpcs_1000basex_interfaces,
>>   		.num_interfaces = ARRAY_SIZE(xpcs_1000basex_interfaces),
>>   		.an_mode = DW_AN_C37_1000BASEX,
>>   	},
>> -	[DW_XPCS_2500BASEX] = {
>> -		.supported = xpcs_2500basex_features,
>> -		.interface = xpcs_2500basex_interfaces,
>> -		.num_interfaces = ARRAY_SIZE(xpcs_2500basex_interfaces),
>> -		.an_mode = DW_2500BASEX,
>> +	[DW_XPCS_SGMII_2500BASEX] = {
>> +		.supported = xpcs_sgmii_2500basex_features,
>> +		.interface = xpcs_sgmii_2500basex_interfaces,
>> +		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_2500basex_features),
>> +		.an_mode = DW_SGMII_2500BASEX,
>>   	},
>>   };
>>   
>> diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
>> index da3a6c30f6d2..f075d2fca54a 100644
>> --- a/include/linux/pcs/pcs-xpcs.h
>> +++ b/include/linux/pcs/pcs-xpcs.h
>> @@ -19,6 +19,7 @@
>>   #define DW_2500BASEX			3
>>   #define DW_AN_C37_1000BASEX		4
>>   #define DW_10GBASER			5
>> +#define DW_SGMII_2500BASEX		6
>>   
>>   /* device vendor OUI */
>>   #define DW_OUI_WX			0x0018fc80
>> -- 
>> 2.25.1
>>
>>
Hi Serge and Russell

This patch does not serve the purpose correctly, I did remove this patch 
and handle it properly in the new patch series.
diff mbox series

Patch

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 4dbc21f604f2..60d90191677d 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -104,6 +104,21 @@  static const int xpcs_2500basex_features[] = {
 	__ETHTOOL_LINK_MODE_MASK_NBITS,
 };
 
+static const int xpcs_sgmii_2500basex_features[] = {
+	ETHTOOL_LINK_MODE_Pause_BIT,
+	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+	ETHTOOL_LINK_MODE_Autoneg_BIT,
+	ETHTOOL_LINK_MODE_10baseT_Half_BIT,
+	ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+	ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+	ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
+	ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
+	__ETHTOOL_LINK_MODE_MASK_NBITS,
+};
+
 static const phy_interface_t xpcs_usxgmii_interfaces[] = {
 	PHY_INTERFACE_MODE_USXGMII,
 };
@@ -133,6 +148,12 @@  static const phy_interface_t xpcs_2500basex_interfaces[] = {
 	PHY_INTERFACE_MODE_MAX,
 };
 
+static const phy_interface_t xpcs_sgmii_2500basex_interfaces[] = {
+	PHY_INTERFACE_MODE_SGMII,
+	PHY_INTERFACE_MODE_2500BASEX,
+	PHY_INTERFACE_MODE_MAX,
+};
+
 enum {
 	DW_XPCS_USXGMII,
 	DW_XPCS_10GKR,
@@ -141,6 +162,7 @@  enum {
 	DW_XPCS_SGMII,
 	DW_XPCS_1000BASEX,
 	DW_XPCS_2500BASEX,
+	DW_XPCS_SGMII_2500BASEX,
 	DW_XPCS_INTERFACE_MAX,
 };
 
@@ -290,6 +312,7 @@  static int xpcs_soft_reset(struct dw_xpcs *xpcs,
 	case DW_AN_C37_SGMII:
 	case DW_2500BASEX:
 	case DW_AN_C37_1000BASEX:
+	case DW_SGMII_2500BASEX:
 		dev = MDIO_MMD_VEND2;
 		break;
 	default:
@@ -748,6 +771,8 @@  static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
 	if (xpcs->dev_flag == DW_DEV_TXGBE)
 		ret |= DW_VR_MII_DIG_CTRL1_PHY_MODE_CTRL;
 
+	/* Disable 2.5G GMII for SGMII C37 mode */
+	ret &= ~DW_VR_MII_DIG_CTRL1_2G5_EN;
 	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
 	if (ret < 0)
 		return ret;
@@ -848,6 +873,26 @@  static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
 	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL, ret);
 }
 
+static int xpcs_config_aneg_c37_sgmii_2500basex(struct dw_xpcs *xpcs,
+						unsigned int neg_mode,
+						phy_interface_t interface)
+{
+	int ret = -EOPNOTSUPP;
+
+	switch (interface) {
+	case PHY_INTERFACE_MODE_SGMII:
+		ret = xpcs_config_aneg_c37_sgmii(xpcs, neg_mode);
+		break;
+	case PHY_INTERFACE_MODE_2500BASEX:
+		ret = xpcs_config_2500basex(xpcs);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
 int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		   const unsigned long *advertising, unsigned int neg_mode)
 {
@@ -890,6 +935,12 @@  int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		if (ret)
 			return ret;
 		break;
+	case DW_SGMII_2500BASEX:
+		ret = xpcs_config_aneg_c37_sgmii_2500basex(xpcs, neg_mode,
+							   interface);
+		if (ret)
+			return ret;
+		break;
 	default:
 		return -1;
 	}
@@ -1114,6 +1165,11 @@  static void xpcs_get_state(struct phylink_pcs *pcs,
 		}
 		break;
 	case DW_AN_C37_SGMII:
+	case DW_SGMII_2500BASEX:
+		/* 2500BASEX is not supported for in-band AN mode. */
+		if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
+			break;
+
 		ret = xpcs_get_state_c37_sgmii(xpcs, state);
 		if (ret) {
 			pr_err("xpcs_get_state_c37_sgmii returned %pe\n",
@@ -1266,23 +1322,17 @@  static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
 		.num_interfaces = ARRAY_SIZE(xpcs_10gbaser_interfaces),
 		.an_mode = DW_10GBASER,
 	},
-	[DW_XPCS_SGMII] = {
-		.supported = xpcs_sgmii_features,
-		.interface = xpcs_sgmii_interfaces,
-		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
-		.an_mode = DW_AN_C37_SGMII,
-	},
 	[DW_XPCS_1000BASEX] = {
 		.supported = xpcs_1000basex_features,
 		.interface = xpcs_1000basex_interfaces,
 		.num_interfaces = ARRAY_SIZE(xpcs_1000basex_interfaces),
 		.an_mode = DW_AN_C37_1000BASEX,
 	},
-	[DW_XPCS_2500BASEX] = {
-		.supported = xpcs_2500basex_features,
-		.interface = xpcs_2500basex_interfaces,
-		.num_interfaces = ARRAY_SIZE(xpcs_2500basex_interfaces),
-		.an_mode = DW_2500BASEX,
+	[DW_XPCS_SGMII_2500BASEX] = {
+		.supported = xpcs_sgmii_2500basex_features,
+		.interface = xpcs_sgmii_2500basex_interfaces,
+		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_2500basex_features),
+		.an_mode = DW_SGMII_2500BASEX,
 	},
 };
 
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index da3a6c30f6d2..f075d2fca54a 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -19,6 +19,7 @@ 
 #define DW_2500BASEX			3
 #define DW_AN_C37_1000BASEX		4
 #define DW_10GBASER			5
+#define DW_SGMII_2500BASEX		6
 
 /* device vendor OUI */
 #define DW_OUI_WX			0x0018fc80