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linux_dsm_epyc7002/drivers/net/phy/phy-c45.c
Yonglong Liu 3de5ae5471 net: phy: Fix "link partner" information disappear issue 
Some drivers just call phy_ethtool_ksettings_set() to set the
links, for those phy drivers that use genphy_read_status(), if
autoneg is on, and the link is up, than execute "ethtool -s
ethx autoneg on" will cause "link partner" information disappear.

The call trace is phy_ethtool_ksettings_set()->phy_start_aneg()
->linkmode_zero(phydev->lp_advertising)->genphy_read_status(),
the link didn't change, so genphy_read_status() just return, and
phydev->lp_advertising is zero now.

This patch moves the clear operation of lp_advertising from
phy_start_aneg() to genphy_read_lpa()/genphy_c45_read_lpa(), and
if autoneg on and autoneg not complete, just clear what the
generic functions care about.

Fixes: 88d6272aca ("net: phy: avoid unneeded MDIO reads in genphy_read_status")
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-10-16 13:17:01 -07:00

569 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Clause 45 PHY support
*/
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/mdio.h>
#include <linux/mii.h>
#include <linux/phy.h>
/**
* genphy_c45_setup_forced - configures a forced speed
* @phydev: target phy_device struct
*/
int genphy_c45_pma_setup_forced(struct phy_device *phydev)
{
int ctrl1, ctrl2, ret;
/* Half duplex is not supported */
if (phydev->duplex != DUPLEX_FULL)
return -EINVAL;
ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
if (ctrl1 < 0)
return ctrl1;
ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
if (ctrl2 < 0)
return ctrl2;
ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
/*
* PMA/PMD type selection is 1.7.5:0 not 1.7.3:0. See 45.2.1.6.1
* in 802.3-2012 and 802.3-2015.
*/
ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE | 0x30);
switch (phydev->speed) {
case SPEED_10:
ctrl2 |= MDIO_PMA_CTRL2_10BT;
break;
case SPEED_100:
ctrl1 |= MDIO_PMA_CTRL1_SPEED100;
ctrl2 |= MDIO_PMA_CTRL2_100BTX;
break;
case SPEED_1000:
ctrl1 |= MDIO_PMA_CTRL1_SPEED1000;
/* Assume 1000base-T */
ctrl2 |= MDIO_PMA_CTRL2_1000BT;
break;
case SPEED_2500:
ctrl1 |= MDIO_CTRL1_SPEED2_5G;
/* Assume 2.5Gbase-T */
ctrl2 |= MDIO_PMA_CTRL2_2_5GBT;
break;
case SPEED_5000:
ctrl1 |= MDIO_CTRL1_SPEED5G;
/* Assume 5Gbase-T */
ctrl2 |= MDIO_PMA_CTRL2_5GBT;
break;
case SPEED_10000:
ctrl1 |= MDIO_CTRL1_SPEED10G;
/* Assume 10Gbase-T */
ctrl2 |= MDIO_PMA_CTRL2_10GBT;
break;
default:
return -EINVAL;
}
ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
if (ret < 0)
return ret;
ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
if (ret < 0)
return ret;
return genphy_c45_an_disable_aneg(phydev);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);
/**
* genphy_c45_an_config_aneg - configure advertisement registers
* @phydev: target phy_device struct
*
* Configure advertisement registers based on modes set in phydev->advertising
*
* Returns negative errno code on failure, 0 if advertisement didn't change,
* or 1 if advertised modes changed.
*/
int genphy_c45_an_config_aneg(struct phy_device *phydev)
{
int changed, ret;
u32 adv;
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
changed = genphy_config_eee_advert(phydev);
adv = linkmode_adv_to_mii_adv_t(phydev->advertising);
ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_ADVERTISE,
ADVERTISE_ALL | ADVERTISE_100BASE4 |
ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
adv);
if (ret < 0)
return ret;
if (ret > 0)
changed = 1;
adv = linkmode_adv_to_mii_10gbt_adv_t(phydev->advertising);
ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
MDIO_AN_10GBT_CTRL_ADV10G |
MDIO_AN_10GBT_CTRL_ADV5G |
MDIO_AN_10GBT_CTRL_ADV2_5G, adv);
if (ret < 0)
return ret;
if (ret > 0)
changed = 1;
return changed;
}
EXPORT_SYMBOL_GPL(genphy_c45_an_config_aneg);
/**
* genphy_c45_an_disable_aneg - disable auto-negotiation
* @phydev: target phy_device struct
*
* Disable auto-negotiation in the Clause 45 PHY. The link parameters
* parameters are controlled through the PMA/PMD MMD registers.
*
* Returns zero on success, negative errno code on failure.
*/
int genphy_c45_an_disable_aneg(struct phy_device *phydev)
{
return phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
}
EXPORT_SYMBOL_GPL(genphy_c45_an_disable_aneg);
/**
* genphy_c45_restart_aneg - Enable and restart auto-negotiation
* @phydev: target phy_device struct
*
* This assumes that the auto-negotiation MMD is present.
*
* Enable and restart auto-negotiation.
*/
int genphy_c45_restart_aneg(struct phy_device *phydev)
{
return phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
}
EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);
/**
* genphy_c45_check_and_restart_aneg - Enable and restart auto-negotiation
* @phydev: target phy_device struct
* @restart: whether aneg restart is requested
*
* This assumes that the auto-negotiation MMD is present.
*
* Check, and restart auto-negotiation if needed.
*/
int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart)
{
int ret = 0;
if (!restart) {
/* Configure and restart aneg if it wasn't set before */
ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
if (ret < 0)
return ret;
if (!(ret & MDIO_AN_CTRL1_ENABLE))
restart = true;
}
if (restart)
ret = genphy_c45_restart_aneg(phydev);
return ret;
}
EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg);
/**
* genphy_c45_aneg_done - return auto-negotiation complete status
* @phydev: target phy_device struct
*
* This assumes that the auto-negotiation MMD is present.
*
* Reads the status register from the auto-negotiation MMD, returning:
* - positive if auto-negotiation is complete
* - negative errno code on error
* - zero otherwise
*/
int genphy_c45_aneg_done(struct phy_device *phydev)
{
int val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
return val < 0 ? val : val & MDIO_AN_STAT1_COMPLETE ? 1 : 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);
/**
* genphy_c45_read_link - read the overall link status from the MMDs
* @phydev: target phy_device struct
*
* Read the link status from the specified MMDs, and if they all indicate
* that the link is up, set phydev->link to 1. If an error is encountered,
* a negative errno will be returned, otherwise zero.
*/
int genphy_c45_read_link(struct phy_device *phydev)
{
u32 mmd_mask = MDIO_DEVS_PMAPMD;
int val, devad;
bool link = true;
if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
if (val < 0)
return val;
/* Autoneg is being started, therefore disregard current
* link status and report link as down.
*/
if (val & MDIO_AN_CTRL1_RESTART) {
phydev->link = 0;
return 0;
}
}
while (mmd_mask && link) {
devad = __ffs(mmd_mask);
mmd_mask &= ~BIT(devad);
/* The link state is latched low so that momentary link
* drops can be detected. Do not double-read the status
* in polling mode to detect such short link drops.
*/
if (!phy_polling_mode(phydev)) {
val = phy_read_mmd(phydev, devad, MDIO_STAT1);
if (val < 0)
return val;
else if (val & MDIO_STAT1_LSTATUS)
continue;
}
val = phy_read_mmd(phydev, devad, MDIO_STAT1);
if (val < 0)
return val;
if (!(val & MDIO_STAT1_LSTATUS))
link = false;
}
phydev->link = link;
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_link);
/**
* genphy_c45_read_lpa - read the link partner advertisement and pause
* @phydev: target phy_device struct
*
* Read the Clause 45 defined base (7.19) and 10G (7.33) status registers,
* filling in the link partner advertisement, pause and asym_pause members
* in @phydev. This assumes that the auto-negotiation MMD is present, and
* the backplane bit (7.48.0) is clear. Clause 45 PHY drivers are expected
* to fill in the remainder of the link partner advert from vendor registers.
*/
int genphy_c45_read_lpa(struct phy_device *phydev)
{
int val;
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
if (val < 0)
return val;
if (!(val & MDIO_AN_STAT1_COMPLETE)) {
linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->lp_advertising);
mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, 0);
phydev->pause = 0;
phydev->asym_pause = 0;
return 0;
}
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->lp_advertising,
val & MDIO_AN_STAT1_LPABLE);
/* Read the link partner's base page advertisement */
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_LPA);
if (val < 0)
return val;
mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, val);
phydev->pause = val & LPA_PAUSE_CAP ? 1 : 0;
phydev->asym_pause = val & LPA_PAUSE_ASYM ? 1 : 0;
/* Read the link partner's 10G advertisement */
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
if (val < 0)
return val;
mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, val);
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);
/**
* genphy_c45_read_pma - read link speed etc from PMA
* @phydev: target phy_device struct
*/
int genphy_c45_read_pma(struct phy_device *phydev)
{
int val;
linkmode_zero(phydev->lp_advertising);
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
if (val < 0)
return val;
switch (val & MDIO_CTRL1_SPEEDSEL) {
case 0:
phydev->speed = SPEED_10;
break;
case MDIO_PMA_CTRL1_SPEED100:
phydev->speed = SPEED_100;
break;
case MDIO_PMA_CTRL1_SPEED1000:
phydev->speed = SPEED_1000;
break;
case MDIO_CTRL1_SPEED2_5G:
phydev->speed = SPEED_2500;
break;
case MDIO_CTRL1_SPEED5G:
phydev->speed = SPEED_5000;
break;
case MDIO_CTRL1_SPEED10G:
phydev->speed = SPEED_10000;
break;
default:
phydev->speed = SPEED_UNKNOWN;
break;
}
phydev->duplex = DUPLEX_FULL;
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_pma);
/**
* genphy_c45_read_mdix - read mdix status from PMA
* @phydev: target phy_device struct
*/
int genphy_c45_read_mdix(struct phy_device *phydev)
{
int val;
if (phydev->speed == SPEED_10000) {
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
MDIO_PMA_10GBT_SWAPPOL);
if (val < 0)
return val;
switch (val) {
case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
phydev->mdix = ETH_TP_MDI;
break;
case 0:
phydev->mdix = ETH_TP_MDI_X;
break;
default:
phydev->mdix = ETH_TP_MDI_INVALID;
break;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);
/**
* genphy_c45_pma_read_abilities - read supported link modes from PMA
* @phydev: target phy_device struct
*
* Read the supported link modes from the PMA Status 2 (1.8) register. If bit
* 1.8.9 is set, the list of supported modes is build using the values in the
* PMA Extended Abilities (1.11) register, indicating 1000BASET an 10G related
* modes. If bit 1.11.14 is set, then the list is also extended with the modes
* in the 2.5G/5G PMA Extended register (1.21), indicating if 2.5GBASET and
* 5GBASET are supported.
*/
int genphy_c45_pma_read_abilities(struct phy_device *phydev)
{
int val;
linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
if (val < 0)
return val;
if (val & MDIO_AN_STAT1_ABLE)
linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->supported);
}
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT2);
if (val < 0)
return val;
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
phydev->supported,
val & MDIO_PMA_STAT2_10GBSR);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
phydev->supported,
val & MDIO_PMA_STAT2_10GBLR);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
phydev->supported,
val & MDIO_PMA_STAT2_10GBER);
if (val & MDIO_PMA_STAT2_EXTABLE) {
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_EXTABLE);
if (val < 0)
return val;
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10GBLRM);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10GBT);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10GBKX4);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10GBKR);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_1000BT);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_1000BKX);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_100BTX);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_100BTX);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10BT);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
phydev->supported,
val & MDIO_PMA_EXTABLE_10BT);
if (val & MDIO_PMA_EXTABLE_NBT) {
val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
MDIO_PMA_NG_EXTABLE);
if (val < 0)
return val;
linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_NG_EXTABLE_2_5GBT);
linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
phydev->supported,
val & MDIO_PMA_NG_EXTABLE_5GBT);
}
}
return 0;
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_read_abilities);
/**
* genphy_c45_read_status - read PHY status
* @phydev: target phy_device struct
*
* Reads status from PHY and sets phy_device members accordingly.
*/
int genphy_c45_read_status(struct phy_device *phydev)
{
int ret;
ret = genphy_c45_read_link(phydev);
if (ret)
return ret;
phydev->speed = SPEED_UNKNOWN;
phydev->duplex = DUPLEX_UNKNOWN;
phydev->pause = 0;
phydev->asym_pause = 0;
if (phydev->autoneg == AUTONEG_ENABLE) {
ret = genphy_c45_read_lpa(phydev);
if (ret)
return ret;
phy_resolve_aneg_linkmode(phydev);
} else {
ret = genphy_c45_read_pma(phydev);
}
return ret;
}
EXPORT_SYMBOL_GPL(genphy_c45_read_status);
/**
* genphy_c45_config_aneg - restart auto-negotiation or forced setup
* @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 force a configuration.
*/
int genphy_c45_config_aneg(struct phy_device *phydev)
{
bool changed = false;
int ret;
if (phydev->autoneg == AUTONEG_DISABLE)
return genphy_c45_pma_setup_forced(phydev);
ret = genphy_c45_an_config_aneg(phydev);
if (ret < 0)
return ret;
if (ret > 0)
changed = true;
return genphy_c45_check_and_restart_aneg(phydev, changed);
}
EXPORT_SYMBOL_GPL(genphy_c45_config_aneg);
/* The gen10g_* functions are the old Clause 45 stub */
int gen10g_config_aneg(struct phy_device *phydev)
{
return 0;
}
EXPORT_SYMBOL_GPL(gen10g_config_aneg);
struct phy_driver genphy_c45_driver = {
.phy_id = 0xffffffff,
.phy_id_mask = 0xffffffff,
.name = "Generic Clause 45 PHY",
.soft_reset = genphy_no_soft_reset,
.read_status = genphy_c45_read_status,
};
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