Messages in this thread | | | From | Vladimir Oltean <> | Date | Fri, 9 Aug 2019 07:58:06 +0300 | Subject | Re: [PATCH net-next v5 2/3] net: phy: add support for clause 37 auto-negotiation |
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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 >
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