diff mbox series

[net-next,v5,2/3] net: phy: add support for clause 37 auto-negotiation

Message ID 20190808234816.4189789-1-taoren@fb.com
State Changes Requested
Delegated to: David Miller
Headers show
Series None | expand

Commit Message

Tao Ren Aug. 8, 2019, 11:48 p.m. UTC
From: Heiner Kallweit <hkallweit1@gmail.com>

This patch adds support for clause 37 1000Base-X auto-negotiation.
It's compile-tested only as I don't have fiber equipment.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/phy_device.c | 139 +++++++++++++++++++++++++++++++++++
 include/linux/phy.h          |   5 ++
 2 files changed, 144 insertions(+)

Comments

Vladimir Oltean Aug. 9, 2019, 4:58 a.m. UTC | #1
On Fri, 9 Aug 2019 at 02:48, Tao Ren <taoren@fb.com> wrote:
>
> From: Heiner Kallweit <hkallweit1@gmail.com>
>
> This patch adds support for clause 37 1000Base-X auto-negotiation.
> It's compile-tested only as I don't have fiber equipment.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---

This needs your signed-off-by as well.

>  drivers/net/phy/phy_device.c | 139 +++++++++++++++++++++++++++++++++++
>  include/linux/phy.h          |   5 ++
>  2 files changed, 144 insertions(+)
>
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 252a712d1b2b..7c5315302937 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -1617,6 +1617,40 @@ static int genphy_config_advert(struct phy_device *phydev)
>         return changed;
>  }
>
> +/**
> + * genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters
> + * @phydev: target phy_device struct
> + *
> + * Description: Writes MII_ADVERTISE with the appropriate values,
> + *   after sanitizing the values to make sure we only advertise
> + *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
> + *   hasn't changed, and > 0 if it has changed. This function is intended
> + *   for Clause 37 1000Base-X mode.
> + */
> +static int genphy_c37_config_advert(struct phy_device *phydev)
> +{
> +       u16 adv = 0;
> +
> +       /* Only allow advertising what this PHY supports */
> +       linkmode_and(phydev->advertising, phydev->advertising,
> +                    phydev->supported);
> +
> +       if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
> +                             phydev->advertising))
> +               adv |= ADVERTISE_1000XFULL;
> +       if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
> +                             phydev->advertising))
> +               adv |= ADVERTISE_1000XPAUSE;
> +       if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> +                             phydev->advertising))
> +               adv |= ADVERTISE_1000XPSE_ASYM;
> +
> +       return phy_modify_changed(phydev, MII_ADVERTISE,
> +                                 ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
> +                                 ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM,
> +                                 adv);
> +}
> +
>  /**
>   * genphy_config_eee_advert - disable unwanted eee mode advertisement
>   * @phydev: target phy_device struct
> @@ -1726,6 +1760,54 @@ int genphy_config_aneg(struct phy_device *phydev)
>  }
>  EXPORT_SYMBOL(genphy_config_aneg);
>
> +/**
> + * genphy_c37_config_aneg - restart auto-negotiation or write BMCR
> + * @phydev: target phy_device struct
> + *
> + * Description: If auto-negotiation is enabled, we configure the
> + *   advertising, and then restart auto-negotiation.  If it is not
> + *   enabled, then we write the BMCR. This function is intended
> + *   for use with Clause 37 1000Base-X mode.
> + */
> +int genphy_c37_config_aneg(struct phy_device *phydev)
> +{
> +       int err, changed;
> +
> +       if (AUTONEG_ENABLE != phydev->autoneg)
> +               return genphy_setup_forced(phydev);
> +
> +       err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100,
> +                        BMCR_SPEED1000);
> +       if (err)
> +               return err;
> +
> +       changed = genphy_c37_config_advert(phydev);
> +       if (changed < 0) /* error */
> +               return changed;
> +
> +       if (!changed) {
> +               /* Advertisement hasn't changed, but maybe aneg was never on to
> +                * begin with?  Or maybe phy was isolated?
> +                */
> +               int ctl = phy_read(phydev, MII_BMCR);
> +
> +               if (ctl < 0)
> +                       return ctl;
> +
> +               if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
> +                       changed = 1; /* do restart aneg */
> +       }
> +
> +       /* Only restart aneg if we are advertising something different
> +        * than we were before.
> +        */
> +       if (changed > 0)
> +               return genphy_restart_aneg(phydev);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(genphy_c37_config_aneg);
> +
>  /**
>   * genphy_aneg_done - return auto-negotiation status
>   * @phydev: target phy_device struct
> @@ -1864,6 +1946,63 @@ int genphy_read_status(struct phy_device *phydev)
>  }
>  EXPORT_SYMBOL(genphy_read_status);
>
> +/**
> + * genphy_c37_read_status - check the link status and update current link state
> + * @phydev: target phy_device struct
> + *
> + * Description: Check the link, then figure out the current state
> + *   by comparing what we advertise with what the link partner
> + *   advertises. This function is for Clause 37 1000Base-X mode.
> + */
> +int genphy_c37_read_status(struct phy_device *phydev)
> +{
> +       int lpa, err, old_link = phydev->link;
> +
> +       /* Update the link, but return if there was an error */
> +       err = genphy_update_link(phydev);
> +       if (err)
> +               return err;
> +
> +       /* why bother the PHY if nothing can have changed */
> +       if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
> +               return 0;
> +
> +       phydev->duplex = DUPLEX_UNKNOWN;
> +       phydev->pause = 0;
> +       phydev->asym_pause = 0;
> +
> +       if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
> +               lpa = phy_read(phydev, MII_LPA);
> +               if (lpa < 0)
> +                       return lpa;
> +
> +               linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +                                phydev->lp_advertising, lpa & LPA_LPACK);
> +               linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
> +                                phydev->lp_advertising, lpa & LPA_1000XFULL);
> +               linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
> +                                phydev->lp_advertising, lpa & LPA_1000XPAUSE);
> +               linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> +                                phydev->lp_advertising,
> +                                lpa & LPA_1000XPAUSE_ASYM);
> +
> +               phy_resolve_aneg_linkmode(phydev);
> +       } else if (phydev->autoneg == AUTONEG_DISABLE) {
> +               int bmcr = phy_read(phydev, MII_BMCR);
> +
> +               if (bmcr < 0)
> +                       return bmcr;
> +
> +               if (bmcr & BMCR_FULLDPLX)
> +                       phydev->duplex = DUPLEX_FULL;
> +               else
> +                       phydev->duplex = DUPLEX_HALF;
> +       }
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(genphy_c37_read_status);
> +
>  /**
>   * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
>   * @phydev: target phy_device struct
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index 462b90b73f93..81a2921512ee 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -1077,6 +1077,11 @@ int genphy_suspend(struct phy_device *phydev);
>  int genphy_resume(struct phy_device *phydev);
>  int genphy_loopback(struct phy_device *phydev, bool enable);
>  int genphy_soft_reset(struct phy_device *phydev);
> +
> +/* Clause 37 */
> +int genphy_c37_config_aneg(struct phy_device *phydev);
> +int genphy_c37_read_status(struct phy_device *phydev);
> +
>  static inline int genphy_no_soft_reset(struct phy_device *phydev)
>  {
>         return 0;
> --
> 2.17.1
>
Tao Ren Aug. 9, 2019, 5:06 a.m. UTC | #2
On 8/8/19 9:58 PM, Vladimir Oltean wrote:
> On Fri, 9 Aug 2019 at 02:48, Tao Ren <taoren@fb.com> wrote:
>>
>> From: Heiner Kallweit <hkallweit1@gmail.com>
>>
>> This patch adds support for clause 37 1000Base-X auto-negotiation.
>> It's compile-tested only as I don't have fiber equipment.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>> ---
> 
> This needs your signed-off-by as well.

I see. I didn't understand signed-off-by correctly and removed myself from the list explicitly. Adding it back now..


Thanks,

Tao
diff mbox series

Patch

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 252a712d1b2b..7c5315302937 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1617,6 +1617,40 @@  static int genphy_config_advert(struct phy_device *phydev)
 	return changed;
 }
 
+/**
+ * genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MII_ADVERTISE with the appropriate values,
+ *   after sanitizing the values to make sure we only advertise
+ *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
+ *   hasn't changed, and > 0 if it has changed. This function is intended
+ *   for Clause 37 1000Base-X mode.
+ */
+static int genphy_c37_config_advert(struct phy_device *phydev)
+{
+	u16 adv = 0;
+
+	/* Only allow advertising what this PHY supports */
+	linkmode_and(phydev->advertising, phydev->advertising,
+		     phydev->supported);
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+			      phydev->advertising))
+		adv |= ADVERTISE_1000XFULL;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+			      phydev->advertising))
+		adv |= ADVERTISE_1000XPAUSE;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+			      phydev->advertising))
+		adv |= ADVERTISE_1000XPSE_ASYM;
+
+	return phy_modify_changed(phydev, MII_ADVERTISE,
+				  ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
+				  ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM,
+				  adv);
+}
+
 /**
  * genphy_config_eee_advert - disable unwanted eee mode advertisement
  * @phydev: target phy_device struct
@@ -1726,6 +1760,54 @@  int genphy_config_aneg(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(genphy_config_aneg);
 
+/**
+ * genphy_c37_config_aneg - restart auto-negotiation or write BMCR
+ * @phydev: target phy_device struct
+ *
+ * Description: If auto-negotiation is enabled, we configure the
+ *   advertising, and then restart auto-negotiation.  If it is not
+ *   enabled, then we write the BMCR. This function is intended
+ *   for use with Clause 37 1000Base-X mode.
+ */
+int genphy_c37_config_aneg(struct phy_device *phydev)
+{
+	int err, changed;
+
+	if (AUTONEG_ENABLE != phydev->autoneg)
+		return genphy_setup_forced(phydev);
+
+	err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100,
+			 BMCR_SPEED1000);
+	if (err)
+		return err;
+
+	changed = genphy_c37_config_advert(phydev);
+	if (changed < 0) /* error */
+		return changed;
+
+	if (!changed) {
+		/* Advertisement hasn't changed, but maybe aneg was never on to
+		 * begin with?  Or maybe phy was isolated?
+		 */
+		int ctl = phy_read(phydev, MII_BMCR);
+
+		if (ctl < 0)
+			return ctl;
+
+		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
+			changed = 1; /* do restart aneg */
+	}
+
+	/* Only restart aneg if we are advertising something different
+	 * than we were before.
+	 */
+	if (changed > 0)
+		return genphy_restart_aneg(phydev);
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_c37_config_aneg);
+
 /**
  * genphy_aneg_done - return auto-negotiation status
  * @phydev: target phy_device struct
@@ -1864,6 +1946,63 @@  int genphy_read_status(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(genphy_read_status);
 
+/**
+ * genphy_c37_read_status - check the link status and update current link state
+ * @phydev: target phy_device struct
+ *
+ * Description: Check the link, then figure out the current state
+ *   by comparing what we advertise with what the link partner
+ *   advertises. This function is for Clause 37 1000Base-X mode.
+ */
+int genphy_c37_read_status(struct phy_device *phydev)
+{
+	int lpa, err, old_link = phydev->link;
+
+	/* Update the link, but return if there was an error */
+	err = genphy_update_link(phydev);
+	if (err)
+		return err;
+
+	/* why bother the PHY if nothing can have changed */
+	if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
+		return 0;
+
+	phydev->duplex = DUPLEX_UNKNOWN;
+	phydev->pause = 0;
+	phydev->asym_pause = 0;
+
+	if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
+		lpa = phy_read(phydev, MII_LPA);
+		if (lpa < 0)
+			return lpa;
+
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				 phydev->lp_advertising, lpa & LPA_LPACK);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+				 phydev->lp_advertising, lpa & LPA_1000XFULL);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+				 phydev->lp_advertising, lpa & LPA_1000XPAUSE);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+				 phydev->lp_advertising,
+				 lpa & LPA_1000XPAUSE_ASYM);
+
+		phy_resolve_aneg_linkmode(phydev);
+	} else if (phydev->autoneg == AUTONEG_DISABLE) {
+		int bmcr = phy_read(phydev, MII_BMCR);
+
+		if (bmcr < 0)
+			return bmcr;
+
+		if (bmcr & BMCR_FULLDPLX)
+			phydev->duplex = DUPLEX_FULL;
+		else
+			phydev->duplex = DUPLEX_HALF;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_c37_read_status);
+
 /**
  * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
  * @phydev: target phy_device struct
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 462b90b73f93..81a2921512ee 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1077,6 +1077,11 @@  int genphy_suspend(struct phy_device *phydev);
 int genphy_resume(struct phy_device *phydev);
 int genphy_loopback(struct phy_device *phydev, bool enable);
 int genphy_soft_reset(struct phy_device *phydev);
+
+/* Clause 37 */
+int genphy_c37_config_aneg(struct phy_device *phydev);
+int genphy_c37_read_status(struct phy_device *phydev);
+
 static inline int genphy_no_soft_reset(struct phy_device *phydev)
 {
 	return 0;