Commit 5eee3bb7 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by David S. Miller
Browse files

net: phy: add and use phy_check_downshift 



So far PHY drivers have to check whether a downshift occurred to be
able to notify the user. To make life of drivers authors a little bit
easier move the downshift notification to phylib. phy_check_downshift()
compares the highest mutually advertised speed with the actual value
of phydev->speed (typically read by the PHY driver from a
vendor-specific register) to detect a downshift.

v2:
- Add downshift hint to phy_print_status

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f4d3e61b

drivers/net/phy/phy-core.c

+38 −0
Original line number Diff line number Diff line
@@ -329,6 +329,44 @@ void phy_resolve_aneg_linkmode(struct phy_device *phydev) 
}

EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);



/**

 * phy_check_downshift - check whether downshift occurred

 * @phydev: The phy_device struct

 *

 * Check whether a downshift to a lower speed occurred. If this should be the

 * case warn the user.

 * Prerequisite for detecting downshift is that PHY driver implements the

 * read_status callback and sets phydev->speed to the actual link speed.

 */

void phy_check_downshift(struct phy_device *phydev)

{

	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);

	int i, speed = SPEED_UNKNOWN;



	phydev->downshifted_rate = 0;



	if (phydev->autoneg == AUTONEG_DISABLE ||

	    phydev->speed == SPEED_UNKNOWN)

		return;



	linkmode_and(common, phydev->lp_advertising, phydev->advertising);



	for (i = 0; i < ARRAY_SIZE(settings); i++)

		if (test_bit(settings[i].bit, common)) {

			speed = settings[i].speed;

			break;

		}



	if (speed == SPEED_UNKNOWN || phydev->speed >= speed)

		return;



	phydev_warn(phydev, "Downshift occurred from negotiated speed %s to actual speed %s, check cabling!\n",

		    phy_speed_to_str(speed), phy_speed_to_str(phydev->speed));



	phydev->downshifted_rate = 1;

}

EXPORT_SYMBOL_GPL(phy_check_downshift);



static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only)

{

	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);

drivers/net/phy/phy.c

+3 −1
Original line number Diff line number Diff line
@@ -96,9 +96,10 @@ void phy_print_status(struct phy_device *phydev) 
{

	if (phydev->link) {

		netdev_info(phydev->attached_dev,

			"Link is Up - %s/%s - flow control %s\n",

			"Link is Up - %s/%s %s- flow control %s\n",

			phy_speed_to_str(phydev->speed),

			phy_duplex_to_str(phydev->duplex),

			phydev->downshifted_rate ? "(downshifted) " : "",

			phy_pause_str(phydev));

	} else	{

		netdev_info(phydev->attached_dev, "Link is Down\n");
@@ -507,6 +508,7 @@ static int phy_check_link_status(struct phy_device *phydev) 
		return err;



	if (phydev->link && phydev->state != PHY_RUNNING) {

		phy_check_downshift(phydev);

		phydev->state = PHY_RUNNING;

		phy_link_up(phydev);

	} else if (!phydev->link && phydev->state != PHY_NOLINK) {

include/linux/phy.h

+3 −0
Original line number Diff line number Diff line
@@ -365,6 +365,7 @@ struct macsec_ops; 
 * suspended_by_mdio_bus: Set to true if this phy was suspended by MDIO bus.

 * sysfs_links: Internal boolean tracking sysfs symbolic links setup/removal.

 * loopback_enabled: Set true if this phy has been loopbacked successfully.

 * downshifted_rate: Set true if link speed has been downshifted.

 * state: state of the PHY for management purposes

 * dev_flags: Device-specific flags used by the PHY driver.

 * irq: IRQ number of the PHY's interrupt (-1 if none)
@@ -405,6 +406,7 @@ struct phy_device { 
	unsigned suspended_by_mdio_bus:1;

	unsigned sysfs_links:1;

	unsigned loopback_enabled:1;

	unsigned downshifted_rate:1;



	unsigned autoneg:1;

	/* The most recently read link state */
@@ -698,6 +700,7 @@ static inline bool phy_is_started(struct phy_device *phydev) 


void phy_resolve_aneg_pause(struct phy_device *phydev);

void phy_resolve_aneg_linkmode(struct phy_device *phydev);

void phy_check_downshift(struct phy_device *phydev);



/**

 * phy_read - Convenience function for reading a given PHY register

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