phylink.c 45.8 KB
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/*
 * phylink models the MAC to optional PHY connection, supporting
 * technologies such as SFP cages where the PHY is hot-pluggable.
 *
 * Copyright (C) 2015 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/gpio/consumer.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/phylink.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>

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#include "sfp.h"
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#include "swphy.h"

#define SUPPORTED_INTERFACES \
	(SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
	 SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
#define ADVERTISED_INTERFACES \
	(ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
	 ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)

enum {
	PHYLINK_DISABLE_STOPPED,
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	PHYLINK_DISABLE_LINK,
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};

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/**
 * struct phylink - internal data type for phylink
 */
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struct phylink {
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	/* private: */
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	struct net_device *netdev;
	const struct phylink_mac_ops *ops;

	unsigned long phylink_disable_state; /* bitmask of disables */
	struct phy_device *phydev;
	phy_interface_t link_interface;	/* PHY_INTERFACE_xxx */
	u8 link_an_mode;		/* MLO_AN_xxx */
	u8 link_port;			/* The current non-phy ethtool port */
	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);

	/* The link configuration settings */
	struct phylink_link_state link_config;
	struct gpio_desc *link_gpio;
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	struct timer_list link_poll;
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	void (*get_fixed_state)(struct net_device *dev,
				struct phylink_link_state *s);
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	struct mutex state_mutex;
	struct phylink_link_state phy_state;
	struct work_struct resolve;

	bool mac_link_dropped;
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	struct sfp_bus *sfp_bus;
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};

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/**
 * phylink_set_port_modes() - set the port type modes in the ethtool mask
 * @mask: ethtool link mode mask
 *
 * Sets all the port type modes in the ethtool mask.  MAC drivers should
 * use this in their 'validate' callback.
 */
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void phylink_set_port_modes(unsigned long *mask)
{
	phylink_set(mask, TP);
	phylink_set(mask, AUI);
	phylink_set(mask, MII);
	phylink_set(mask, FIBRE);
	phylink_set(mask, BNC);
	phylink_set(mask, Backplane);
}
EXPORT_SYMBOL_GPL(phylink_set_port_modes);

static int phylink_is_empty_linkmode(const unsigned long *linkmode)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };

	phylink_set_port_modes(tmp);
	phylink_set(tmp, Autoneg);
	phylink_set(tmp, Pause);
	phylink_set(tmp, Asym_Pause);

	bitmap_andnot(tmp, linkmode, tmp, __ETHTOOL_LINK_MODE_MASK_NBITS);

	return linkmode_empty(tmp);
}

static const char *phylink_an_mode_str(unsigned int mode)
{
	static const char *modestr[] = {
		[MLO_AN_PHY] = "phy",
		[MLO_AN_FIXED] = "fixed",
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		[MLO_AN_INBAND] = "inband",
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	};

	return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
}

static int phylink_validate(struct phylink *pl, unsigned long *supported,
			    struct phylink_link_state *state)
{
	pl->ops->validate(pl->netdev, supported, state);

	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
}

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static int phylink_parse_fixedlink(struct phylink *pl,
				   struct fwnode_handle *fwnode)
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{
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	struct fwnode_handle *fixed_node;
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	const struct phy_setting *s;
	struct gpio_desc *desc;
	u32 speed;
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	int ret;
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	fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
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	if (fixed_node) {
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		ret = fwnode_property_read_u32(fixed_node, "speed", &speed);
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		pl->link_config.speed = speed;
		pl->link_config.duplex = DUPLEX_HALF;

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		if (fwnode_property_read_bool(fixed_node, "full-duplex"))
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			pl->link_config.duplex = DUPLEX_FULL;

		/* We treat the "pause" and "asym-pause" terminology as
		 * defining the link partner's ability. */
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		if (fwnode_property_read_bool(fixed_node, "pause"))
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			pl->link_config.pause |= MLO_PAUSE_SYM;
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		if (fwnode_property_read_bool(fixed_node, "asym-pause"))
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			pl->link_config.pause |= MLO_PAUSE_ASYM;

		if (ret == 0) {
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			desc = fwnode_get_named_gpiod(fixed_node, "link-gpios",
						      0, GPIOD_IN, "?");
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			if (!IS_ERR(desc))
				pl->link_gpio = desc;
			else if (desc == ERR_PTR(-EPROBE_DEFER))
				ret = -EPROBE_DEFER;
		}
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		fwnode_handle_put(fixed_node);
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		if (ret)
			return ret;
	} else {
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		u32 prop[5];

		ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
						     NULL, 0);
		if (ret != ARRAY_SIZE(prop)) {
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			netdev_err(pl->netdev, "broken fixed-link?\n");
			return -EINVAL;
		}
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		ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
						     prop, ARRAY_SIZE(prop));
		if (!ret) {
			pl->link_config.duplex = prop[1] ?
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						DUPLEX_FULL : DUPLEX_HALF;
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			pl->link_config.speed = prop[2];
			if (prop[3])
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				pl->link_config.pause |= MLO_PAUSE_SYM;
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			if (prop[4])
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				pl->link_config.pause |= MLO_PAUSE_ASYM;
		}
	}

	if (pl->link_config.speed > SPEED_1000 &&
	    pl->link_config.duplex != DUPLEX_FULL)
		netdev_warn(pl->netdev, "fixed link specifies half duplex for %dMbps link?\n",
			    pl->link_config.speed);

	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
	linkmode_copy(pl->link_config.advertising, pl->supported);
	phylink_validate(pl, pl->supported, &pl->link_config);

	s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
			       pl->supported,
			       __ETHTOOL_LINK_MODE_MASK_NBITS, true);
	linkmode_zero(pl->supported);
	phylink_set(pl->supported, MII);
	if (s) {
		__set_bit(s->bit, pl->supported);
	} else {
		netdev_warn(pl->netdev, "fixed link %s duplex %dMbps not recognised\n",
			    pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
			    pl->link_config.speed);
	}

	linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
		     pl->supported);

	pl->link_config.link = 1;
	pl->link_config.an_complete = 1;

	return 0;
}

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static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
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{
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	struct fwnode_handle *dn;
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	const char *managed;

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	dn = fwnode_get_named_child_node(fwnode, "fixed-link");
	if (dn || fwnode_property_present(fwnode, "fixed-link"))
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		pl->link_an_mode = MLO_AN_FIXED;
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	fwnode_handle_put(dn);
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	if (fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
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	    strcmp(managed, "in-band-status") == 0) {
		if (pl->link_an_mode == MLO_AN_FIXED) {
			netdev_err(pl->netdev,
				   "can't use both fixed-link and in-band-status\n");
			return -EINVAL;
		}

		linkmode_zero(pl->supported);
		phylink_set(pl->supported, MII);
		phylink_set(pl->supported, Autoneg);
		phylink_set(pl->supported, Asym_Pause);
		phylink_set(pl->supported, Pause);
		pl->link_config.an_enabled = true;
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		pl->link_an_mode = MLO_AN_INBAND;
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		switch (pl->link_config.interface) {
		case PHY_INTERFACE_MODE_SGMII:
			phylink_set(pl->supported, 10baseT_Half);
			phylink_set(pl->supported, 10baseT_Full);
			phylink_set(pl->supported, 100baseT_Half);
			phylink_set(pl->supported, 100baseT_Full);
			phylink_set(pl->supported, 1000baseT_Half);
			phylink_set(pl->supported, 1000baseT_Full);
			break;

		case PHY_INTERFACE_MODE_1000BASEX:
			phylink_set(pl->supported, 1000baseX_Full);
			break;

		case PHY_INTERFACE_MODE_2500BASEX:
			phylink_set(pl->supported, 2500baseX_Full);
			break;

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		case PHY_INTERFACE_MODE_10GKR:
			phylink_set(pl->supported, 10baseT_Half);
			phylink_set(pl->supported, 10baseT_Full);
			phylink_set(pl->supported, 100baseT_Half);
			phylink_set(pl->supported, 100baseT_Full);
			phylink_set(pl->supported, 1000baseT_Half);
			phylink_set(pl->supported, 1000baseT_Full);
			phylink_set(pl->supported, 1000baseX_Full);
			phylink_set(pl->supported, 10000baseKR_Full);
			phylink_set(pl->supported, 10000baseCR_Full);
			phylink_set(pl->supported, 10000baseSR_Full);
			phylink_set(pl->supported, 10000baseLR_Full);
			phylink_set(pl->supported, 10000baseLRM_Full);
			phylink_set(pl->supported, 10000baseER_Full);
			break;

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		default:
			netdev_err(pl->netdev,
				   "incorrect link mode %s for in-band status\n",
				   phy_modes(pl->link_config.interface));
			return -EINVAL;
		}

		linkmode_copy(pl->link_config.advertising, pl->supported);

		if (phylink_validate(pl, pl->supported, &pl->link_config)) {
			netdev_err(pl->netdev,
				   "failed to validate link configuration for in-band status\n");
			return -EINVAL;
		}
	}

	return 0;
}

static void phylink_mac_config(struct phylink *pl,
			       const struct phylink_link_state *state)
{
	netdev_dbg(pl->netdev,
		   "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
		   __func__, phylink_an_mode_str(pl->link_an_mode),
		   phy_modes(state->interface),
		   phy_speed_to_str(state->speed),
		   phy_duplex_to_str(state->duplex),
		   __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
		   state->pause, state->link, state->an_enabled);

	pl->ops->mac_config(pl->netdev, pl->link_an_mode, state);
}

static void phylink_mac_an_restart(struct phylink *pl)
{
	if (pl->link_config.an_enabled &&
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	    phy_interface_mode_is_8023z(pl->link_config.interface))
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		pl->ops->mac_an_restart(pl->netdev);
}

static int phylink_get_mac_state(struct phylink *pl, struct phylink_link_state *state)
{
	struct net_device *ndev = pl->netdev;

	linkmode_copy(state->advertising, pl->link_config.advertising);
	linkmode_zero(state->lp_advertising);
	state->interface = pl->link_config.interface;
	state->an_enabled = pl->link_config.an_enabled;
	state->link = 1;

	return pl->ops->mac_link_state(ndev, state);
}

/* The fixed state is... fixed except for the link state,
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 * which may be determined by a GPIO or a callback.
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 */
static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
{
	*state = pl->link_config;
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	if (pl->get_fixed_state)
		pl->get_fixed_state(pl->netdev, state);
	else if (pl->link_gpio)
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		state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
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}

/* Flow control is resolved according to our and the link partners
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 * advertisements using the following drawn from the 802.3 specs:
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 *  Local device  Link partner
 *  Pause AsymDir Pause AsymDir Result
 *    1     X       1     X     TX+RX
 *    0     1       1     1     RX
 *    1     1       0     1     TX
 */
static void phylink_resolve_flow(struct phylink *pl,
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				 struct phylink_link_state *state)
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{
	int new_pause = 0;

	if (pl->link_config.pause & MLO_PAUSE_AN) {
		int pause = 0;

		if (phylink_test(pl->link_config.advertising, Pause))
			pause |= MLO_PAUSE_SYM;
		if (phylink_test(pl->link_config.advertising, Asym_Pause))
			pause |= MLO_PAUSE_ASYM;

		pause &= state->pause;

		if (pause & MLO_PAUSE_SYM)
			new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
		else if (pause & MLO_PAUSE_ASYM)
			new_pause = state->pause & MLO_PAUSE_SYM ?
				 MLO_PAUSE_RX : MLO_PAUSE_TX;
	} else {
		new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
	}

	state->pause &= ~MLO_PAUSE_TXRX_MASK;
	state->pause |= new_pause;
}

static const char *phylink_pause_to_str(int pause)
{
	switch (pause & MLO_PAUSE_TXRX_MASK) {
	case MLO_PAUSE_TX | MLO_PAUSE_RX:
		return "rx/tx";
	case MLO_PAUSE_TX:
		return "tx";
	case MLO_PAUSE_RX:
		return "rx";
	default:
		return "off";
	}
}

static void phylink_resolve(struct work_struct *w)
{
	struct phylink *pl = container_of(w, struct phylink, resolve);
	struct phylink_link_state link_state;
	struct net_device *ndev = pl->netdev;

	mutex_lock(&pl->state_mutex);
	if (pl->phylink_disable_state) {
		pl->mac_link_dropped = false;
		link_state.link = false;
	} else if (pl->mac_link_dropped) {
		link_state.link = false;
	} else {
		switch (pl->link_an_mode) {
		case MLO_AN_PHY:
			link_state = pl->phy_state;
			phylink_resolve_flow(pl, &link_state);
			phylink_mac_config(pl, &link_state);
			break;

		case MLO_AN_FIXED:
			phylink_get_fixed_state(pl, &link_state);
			phylink_mac_config(pl, &link_state);
			break;

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		case MLO_AN_INBAND:
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			phylink_get_mac_state(pl, &link_state);
			if (pl->phydev) {
				bool changed = false;

				link_state.link = link_state.link &&
						  pl->phy_state.link;

				if (pl->phy_state.interface !=
				    link_state.interface) {
					link_state.interface = pl->phy_state.interface;
					changed = true;
				}

				/* Propagate the flow control from the PHY
				 * to the MAC. Also propagate the interface
				 * if changed.
				 */
				if (pl->phy_state.link || changed) {
					link_state.pause |= pl->phy_state.pause;
					phylink_resolve_flow(pl, &link_state);

					phylink_mac_config(pl, &link_state);
				}
			}
			break;
		}
	}

	if (link_state.link != netif_carrier_ok(ndev)) {
		if (!link_state.link) {
			netif_carrier_off(ndev);
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			pl->ops->mac_link_down(ndev, pl->link_an_mode,
					       pl->phy_state.interface);
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			netdev_info(ndev, "Link is Down\n");
		} else {
			pl->ops->mac_link_up(ndev, pl->link_an_mode,
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					     pl->phy_state.interface,
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					     pl->phydev);

			netif_carrier_on(ndev);

			netdev_info(ndev,
				    "Link is Up - %s/%s - flow control %s\n",
				    phy_speed_to_str(link_state.speed),
				    phy_duplex_to_str(link_state.duplex),
				    phylink_pause_to_str(link_state.pause));
		}
	}
	if (!link_state.link && pl->mac_link_dropped) {
		pl->mac_link_dropped = false;
		queue_work(system_power_efficient_wq, &pl->resolve);
	}
	mutex_unlock(&pl->state_mutex);
}

static void phylink_run_resolve(struct phylink *pl)
{
	if (!pl->phylink_disable_state)
		queue_work(system_power_efficient_wq, &pl->resolve);
}

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static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
{
	unsigned long state = pl->phylink_disable_state;

	set_bit(bit, &pl->phylink_disable_state);
	if (state == 0) {
		queue_work(system_power_efficient_wq, &pl->resolve);
		flush_work(&pl->resolve);
	}
}

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static void phylink_fixed_poll(struct timer_list *t)
{
	struct phylink *pl = container_of(t, struct phylink, link_poll);

	mod_timer(t, jiffies + HZ);

	phylink_run_resolve(pl);
}

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static const struct sfp_upstream_ops sfp_phylink_ops;

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static int phylink_register_sfp(struct phylink *pl,
				struct fwnode_handle *fwnode)
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{
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	struct fwnode_reference_args ref;
	int ret;
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	if (!fwnode)
		return 0;

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	ret = fwnode_property_get_reference_args(fwnode, "sfp", NULL,
						 0, 0, &ref);
	if (ret < 0) {
		if (ret == -ENOENT)
			return 0;

		netdev_err(pl->netdev, "unable to parse \"sfp\" node: %d\n",
			   ret);
		return ret;
	}
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	pl->sfp_bus = sfp_register_upstream(ref.fwnode, pl->netdev, pl,
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					    &sfp_phylink_ops);
	if (!pl->sfp_bus)
		return -ENOMEM;

	return 0;
}

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/**
 * phylink_create() - create a phylink instance
 * @ndev: a pointer to the &struct net_device
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 * @fwnode: a pointer to a &struct fwnode_handle describing the network
 *	interface
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 * @iface: the desired link mode defined by &typedef phy_interface_t
 * @ops: a pointer to a &struct phylink_mac_ops for the MAC.
 *
 * Create a new phylink instance, and parse the link parameters found in @np.
 * This will parse in-band modes, fixed-link or SFP configuration.
 *
 * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 * must use IS_ERR() to check for errors from this function.
 */
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struct phylink *phylink_create(struct net_device *ndev,
			       struct fwnode_handle *fwnode,
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			       phy_interface_t iface,
			       const struct phylink_mac_ops *ops)
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{
	struct phylink *pl;
	int ret;

	pl = kzalloc(sizeof(*pl), GFP_KERNEL);
	if (!pl)
		return ERR_PTR(-ENOMEM);

	mutex_init(&pl->state_mutex);
	INIT_WORK(&pl->resolve, phylink_resolve);
	pl->netdev = ndev;
	pl->phy_state.interface = iface;
	pl->link_interface = iface;
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	if (iface == PHY_INTERFACE_MODE_MOCA)
		pl->link_port = PORT_BNC;
	else
		pl->link_port = PORT_MII;
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	pl->link_config.interface = iface;
	pl->link_config.pause = MLO_PAUSE_AN;
	pl->link_config.speed = SPEED_UNKNOWN;
	pl->link_config.duplex = DUPLEX_UNKNOWN;
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	pl->link_config.an_enabled = true;
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	pl->ops = ops;
	__set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
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	timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
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	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
	linkmode_copy(pl->link_config.advertising, pl->supported);
	phylink_validate(pl, pl->supported, &pl->link_config);

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	ret = phylink_parse_mode(pl, fwnode);
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	if (ret < 0) {
		kfree(pl);
		return ERR_PTR(ret);
	}

	if (pl->link_an_mode == MLO_AN_FIXED) {
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		ret = phylink_parse_fixedlink(pl, fwnode);
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		if (ret < 0) {
			kfree(pl);
			return ERR_PTR(ret);
		}
	}

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	ret = phylink_register_sfp(pl, fwnode);
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	if (ret < 0) {
		kfree(pl);
		return ERR_PTR(ret);
	}

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	return pl;
}
EXPORT_SYMBOL_GPL(phylink_create);

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/**
 * phylink_destroy() - cleanup and destroy the phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Destroy a phylink instance. Any PHY that has been attached must have been
 * cleaned up via phylink_disconnect_phy() prior to calling this function.
 */
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void phylink_destroy(struct phylink *pl)
{
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	if (pl->sfp_bus)
		sfp_unregister_upstream(pl->sfp_bus);
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	if (!IS_ERR_OR_NULL(pl->link_gpio))
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		gpiod_put(pl->link_gpio);
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	cancel_work_sync(&pl->resolve);
	kfree(pl);
}
EXPORT_SYMBOL_GPL(phylink_destroy);

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static void phylink_phy_change(struct phy_device *phydev, bool up,
			       bool do_carrier)
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{
	struct phylink *pl = phydev->phylink;

	mutex_lock(&pl->state_mutex);
	pl->phy_state.speed = phydev->speed;
	pl->phy_state.duplex = phydev->duplex;
	pl->phy_state.pause = MLO_PAUSE_NONE;
	if (phydev->pause)
		pl->phy_state.pause |= MLO_PAUSE_SYM;
	if (phydev->asym_pause)
		pl->phy_state.pause |= MLO_PAUSE_ASYM;
	pl->phy_state.interface = phydev->interface;
	pl->phy_state.link = up;
	mutex_unlock(&pl->state_mutex);

	phylink_run_resolve(pl);

	netdev_dbg(pl->netdev, "phy link %s %s/%s/%s\n", up ? "up" : "down",
639
		   phy_modes(phydev->interface),
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685
		   phy_speed_to_str(phydev->speed),
		   phy_duplex_to_str(phydev->duplex));
}

static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy)
{
	struct phylink_link_state config;
	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
	u32 advertising;
	int ret;

	memset(&config, 0, sizeof(config));
	ethtool_convert_legacy_u32_to_link_mode(supported, phy->supported);
	ethtool_convert_legacy_u32_to_link_mode(config.advertising,
						phy->advertising);
	config.interface = pl->link_config.interface;

	/*
	 * This is the new way of dealing with flow control for PHYs,
	 * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
	 * phy drivers should not set SUPPORTED_[Asym_]Pause") except
	 * using our validate call to the MAC, we rely upon the MAC
	 * clearing the bits from both supported and advertising fields.
	 */
	if (phylink_test(supported, Pause))
		phylink_set(config.advertising, Pause);
	if (phylink_test(supported, Asym_Pause))
		phylink_set(config.advertising, Asym_Pause);

	ret = phylink_validate(pl, supported, &config);
	if (ret)
		return ret;

	phy->phylink = pl;
	phy->phy_link_change = phylink_phy_change;

	netdev_info(pl->netdev,
		    "PHY [%s] driver [%s]\n", dev_name(&phy->mdio.dev),
		    phy->drv->name);

	mutex_lock(&phy->lock);
	mutex_lock(&pl->state_mutex);
	pl->phydev = phy;
	linkmode_copy(pl->supported, supported);
	linkmode_copy(pl->link_config.advertising, config.advertising);

686
	/* Restrict the phy advertisement according to the MAC support. */
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703
	ethtool_convert_link_mode_to_legacy_u32(&advertising, config.advertising);
	phy->advertising = advertising;
	mutex_unlock(&pl->state_mutex);
	mutex_unlock(&phy->lock);

	netdev_dbg(pl->netdev,
		   "phy: setting supported %*pb advertising 0x%08x\n",
		   __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
		   phy->advertising);

	phy_start_machine(phy);
	if (phy->irq > 0)
		phy_start_interrupts(phy);

	return 0;
}

704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
static int __phylink_connect_phy(struct phylink *pl, struct phy_device *phy,
		phy_interface_t interface)
{
	int ret;

	if (WARN_ON(pl->link_an_mode == MLO_AN_FIXED ||
		    (pl->link_an_mode == MLO_AN_INBAND &&
		     phy_interface_mode_is_8023z(interface))))
		return -EINVAL;

	if (pl->phydev)
		return -EBUSY;

	ret = phy_attach_direct(pl->netdev, phy, 0, interface);
	if (ret)
		return ret;

	ret = phylink_bringup_phy(pl, phy);
	if (ret)
		phy_detach(phy);

	return ret;
}

728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
/**
 * phylink_connect_phy() - connect a PHY to the phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @phy: a pointer to a &struct phy_device.
 *
 * Connect @phy to the phylink instance specified by @pl by calling
 * phy_attach_direct(). Configure the @phy according to the MAC driver's
 * capabilities, start the PHYLIB state machine and enable any interrupts
 * that the PHY supports.
 *
 * This updates the phylink's ethtool supported and advertising link mode
 * masks.
 *
 * Returns 0 on success or a negative errno.
 */
743 744
int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
{
745 746 747 748 749 750
	/* Use PHY device/driver interface */
	if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
		pl->link_interface = phy->interface;
		pl->link_config.interface = pl->link_interface;
	}

751
	return __phylink_connect_phy(pl, phy, pl->link_interface);
752 753 754
}
EXPORT_SYMBOL_GPL(phylink_connect_phy);

755 756 757 758
/**
 * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @dn: a pointer to a &struct device_node.
759
 * @flags: PHY-specific flags to communicate to the PHY device driver
760 761 762 763 764 765 766
 *
 * Connect the phy specified in the device node @dn to the phylink instance
 * specified by @pl. Actions specified in phylink_connect_phy() will be
 * performed.
 *
 * Returns 0 on success or a negative errno.
 */
767 768
int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
			   u32 flags)
769 770 771 772 773
{
	struct device_node *phy_node;
	struct phy_device *phy_dev;
	int ret;

774 775
	/* Fixed links and 802.3z are handled without needing a PHY */
	if (pl->link_an_mode == MLO_AN_FIXED ||
776 777
	    (pl->link_an_mode == MLO_AN_INBAND &&
	     phy_interface_mode_is_8023z(pl->link_interface)))
778 779 780 781 782 783 784 785 786
		return 0;

	phy_node = of_parse_phandle(dn, "phy-handle", 0);
	if (!phy_node)
		phy_node = of_parse_phandle(dn, "phy", 0);
	if (!phy_node)
		phy_node = of_parse_phandle(dn, "phy-device", 0);

	if (!phy_node) {
787
		if (pl->link_an_mode == MLO_AN_PHY)
788 789 790 791
			return -ENODEV;
		return 0;
	}

792 793
	phy_dev = of_phy_attach(pl->netdev, phy_node, flags,
				pl->link_interface);
794 795 796 797 798 799 800 801 802 803 804 805 806 807
	/* We're done with the phy_node handle */
	of_node_put(phy_node);

	if (!phy_dev)
		return -ENODEV;

	ret = phylink_bringup_phy(pl, phy_dev);
	if (ret)
		phy_detach(phy_dev);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_of_phy_connect);

808 809 810 811 812 813 814
/**
 * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
 *   instance.
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Disconnect any current PHY from the phylink instance described by @pl.
 */
815 816 817 818
void phylink_disconnect_phy(struct phylink *pl)
{
	struct phy_device *phy;

819
	ASSERT_RTNL();
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834

	phy = pl->phydev;
	if (phy) {
		mutex_lock(&phy->lock);
		mutex_lock(&pl->state_mutex);
		pl->phydev = NULL;
		mutex_unlock(&pl->state_mutex);
		mutex_unlock(&phy->lock);
		flush_work(&pl->resolve);

		phy_disconnect(phy);
	}
}
EXPORT_SYMBOL_GPL(phylink_disconnect_phy);

835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
/**
 * phylink_fixed_state_cb() - allow setting a fixed link callback
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @cb: callback to execute to determine the fixed link state.
 *
 * The MAC driver should call this driver when the state of its link
 * can be determined through e.g: an out of band MMIO register.
 */
int phylink_fixed_state_cb(struct phylink *pl,
			   void (*cb)(struct net_device *dev,
				      struct phylink_link_state *state))
{
	/* It does not make sense to let the link be overriden unless we use
	 * MLO_AN_FIXED
	 */
	if (pl->link_an_mode != MLO_AN_FIXED)
		return -EINVAL;

	mutex_lock(&pl->state_mutex);
	pl->get_fixed_state = cb;
	mutex_unlock(&pl->state_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_fixed_state_cb);

861 862 863 864 865 866 867 868
/**
 * phylink_mac_change() - notify phylink of a change in MAC state
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @up: indicates whether the link is currently up.
 *
 * The MAC driver should call this driver when the state of its link
 * changes (eg, link failure, new negotiation results, etc.)
 */
869 870 871 872 873 874 875 876 877
void phylink_mac_change(struct phylink *pl, bool up)
{
	if (!up)
		pl->mac_link_dropped = true;
	phylink_run_resolve(pl);
	netdev_dbg(pl->netdev, "mac link %s\n", up ? "up" : "down");
}
EXPORT_SYMBOL_GPL(phylink_mac_change);

878 879 880 881 882 883 884 885
/**
 * phylink_start() - start a phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Start the phylink instance specified by @pl, configuring the MAC for the
 * desired link mode(s) and negotiation style. This should be called from the
 * network device driver's &struct net_device_ops ndo_open() method.
 */
886 887
void phylink_start(struct phylink *pl)
{
888
	ASSERT_RTNL();
889 890 891 892 893

	netdev_info(pl->netdev, "configuring for %s/%s link mode\n",
		    phylink_an_mode_str(pl->link_an_mode),
		    phy_modes(pl->link_config.interface));

894 895 896
	/* Always set the carrier off */
	netif_carrier_off(pl->netdev);

897 898
	/* Apply the link configuration to the MAC when starting. This allows
	 * a fixed-link to start with the correct parameters, and also
899
	 * ensures that we set the appropriate advertisement for Serdes links.
900 901 902 903
	 */
	phylink_resolve_flow(pl, &pl->link_config);
	phylink_mac_config(pl, &pl->link_config);

904 905 906 907 908 909
	/* Restart autonegotiation if using 802.3z to ensure that the link
	 * parameters are properly negotiated.  This is necessary for DSA
	 * switches using 802.3z negotiation to ensure they see our modes.
	 */
	phylink_mac_an_restart(pl);

910 911 912
	clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
	phylink_run_resolve(pl);

913 914
	if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
		mod_timer(&pl->link_poll, jiffies + HZ);
915 916
	if (pl->sfp_bus)
		sfp_upstream_start(pl->sfp_bus);
917 918 919 920 921
	if (pl->phydev)
		phy_start(pl->phydev);
}
EXPORT_SYMBOL_GPL(phylink_start);

922 923 924 925 926 927 928 929 930
/**
 * phylink_stop() - stop a phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Stop the phylink instance specified by @pl. This should be called from the
 * network device driver's &struct net_device_ops ndo_stop() method.  The
 * network device's carrier state should not be changed prior to calling this
 * function.
 */
931 932
void phylink_stop(struct phylink *pl)
{
933
	ASSERT_RTNL();
934 935 936

	if (pl->phydev)
		phy_stop(pl->phydev);
937 938
	if (pl->sfp_bus)
		sfp_upstream_stop(pl->sfp_bus);
939 940
	if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
		del_timer_sync(&pl->link_poll);
941

942
	phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
943 944 945
}
EXPORT_SYMBOL_GPL(phylink_stop);

946 947 948 949 950 951 952 953 954
/**
 * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
 *
 * Read the wake on lan parameters from the PHY attached to the phylink
 * instance specified by @pl. If no PHY is currently attached, report no
 * support for wake on lan.
 */
955 956
void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
957
	ASSERT_RTNL();
958 959 960 961 962 963 964 965 966

	wol->supported = 0;
	wol->wolopts = 0;

	if (pl->phydev)
		phy_ethtool_get_wol(pl->phydev, wol);
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);

967 968 969 970 971 972 973 974 975 976 977
/**
 * phylink_ethtool_set_wol() - set wake on lan parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
 *
 * Set the wake on lan parameters for the PHY attached to the phylink
 * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
 * error.
 *
 * Returns zero on success or negative errno code.
 */
978 979 980 981
int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
	int ret = -EOPNOTSUPP;

982
	ASSERT_RTNL();
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012

	if (pl->phydev)
		ret = phy_ethtool_set_wol(pl->phydev, wol);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);

static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask);

	linkmode_zero(mask);
	phylink_set_port_modes(mask);

	linkmode_and(dst, dst, mask);
	linkmode_or(dst, dst, b);
}

static void phylink_get_ksettings(const struct phylink_link_state *state,
				  struct ethtool_link_ksettings *kset)
{
	phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
	linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
	kset->base.speed = state->speed;
	kset->base.duplex = state->duplex;
	kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
				AUTONEG_DISABLE;
}

1013 1014 1015 1016 1017 1018 1019 1020 1021
/**
 * phylink_ethtool_ksettings_get() - get the current link settings
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
 *
 * Read the current link settings for the phylink instance specified by @pl.
 * This will be the link settings read from the MAC, PHY or fixed link
 * settings depending on the current negotiation mode.
 */
1022
int phylink_ethtool_ksettings_get(struct phylink *pl,
1023
				  struct ethtool_link_ksettings *kset)
1024 1025 1026
{
	struct phylink_link_state link_state;

1027
	ASSERT_RTNL();
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046

	if (pl->phydev) {
		phy_ethtool_ksettings_get(pl->phydev, kset);
	} else {
		kset->base.port = pl->link_port;
	}

	linkmode_copy(kset->link_modes.supported, pl->supported);

	switch (pl->link_an_mode) {
	case MLO_AN_FIXED:
		/* We are using fixed settings. Report these as the
		 * current link settings - and note that these also
		 * represent the supported speeds/duplex/pause modes.
		 */
		phylink_get_fixed_state(pl, &link_state);
		phylink_get_ksettings(&link_state, kset);
		break;

1047
	case MLO_AN_INBAND:
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
		/* If there is a phy attached, then use the reported
		 * settings from the phy with no modification.
		 */
		if (pl->phydev)
			break;

		phylink_get_mac_state(pl, &link_state);

		/* The MAC is reporting the link results from its own PCS
		 * layer via in-band status. Report these as the current
		 * link settings.
		 */
		phylink_get_ksettings(&link_state, kset);
		break;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);

1068 1069 1070 1071 1072
/**
 * phylink_ethtool_ksettings_set() - set the link settings
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
 */
1073
int phylink_ethtool_ksettings_set(struct phylink *pl,
1074
				  const struct ethtool_link_ksettings *kset)
1075 1076 1077 1078 1079
{
	struct ethtool_link_ksettings our_kset;
	struct phylink_link_state config;
	int ret;

1080
	ASSERT_RTNL();
1081 1082 1083 1084 1085 1086 1087

	if (kset->base.autoneg != AUTONEG_DISABLE &&
	    kset->base.autoneg != AUTONEG_ENABLE)
		return -EINVAL;

	config = pl->link_config;

1088
	/* Mask out unsupported advertisements */
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
	linkmode_and(config.advertising, kset->link_modes.advertising,
		     pl->supported);

	/* FIXME: should we reject autoneg if phy/mac does not support it? */
	if (kset->base.autoneg == AUTONEG_DISABLE) {
		const struct phy_setting *s;

		/* Autonegotiation disabled, select a suitable speed and
		 * duplex.
		 */
		s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
				       pl->supported,
				       __ETHTOOL_LINK_MODE_MASK_NBITS, false);
		if (!s)
			return -EINVAL;

		/* If we have a fixed link (as specified by firmware), refuse
		 * to change link parameters.
		 */
		if (pl->link_an_mode == MLO_AN_FIXED &&
		    (s->speed != pl->link_config.speed ||
		     s->duplex != pl->link_config.duplex))
			return -EINVAL;

		config.speed = s->speed;
		config.duplex = s->duplex;
		config.an_enabled = false;

		__clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
	} else {
		/* If we have a fixed link, refuse to enable autonegotiation */
		if (pl->link_an_mode == MLO_AN_FIXED)
			return -EINVAL;

		config.speed = SPEED_UNKNOWN;
		config.duplex = DUPLEX_UNKNOWN;
		config.an_enabled = true;

		__set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
	}

	if (phylink_validate(pl, pl->supported, &config))
		return -EINVAL;

1133
	/* If autonegotiation is enabled, we must have an advertisement */
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
		return -EINVAL;

	our_kset = *kset;
	linkmode_copy(our_kset.link_modes.advertising, config.advertising);
	our_kset.base.speed = config.speed;
	our_kset.base.duplex = config.duplex;

	/* If we have a PHY, configure the phy */
	if (pl->phydev) {
		ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
		if (ret)
			return ret;
	}

	mutex_lock(&pl->state_mutex);
	/* Configure the MAC to match the new settings */
	linkmode_copy(pl->link_config.advertising, our_kset.link_modes.advertising);
1152
	pl->link_config.interface = config.interface;
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	pl->link_config.speed = our_kset.base.speed;
	pl->link_config.duplex = our_kset.base.duplex;
	pl->link_config.an_enabled = our_kset.base.autoneg != AUTONEG_DISABLE;

	if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
		phylink_mac_config(pl, &pl->link_config);
		phylink_mac_an_restart(pl);
	}
	mutex_unlock(&pl->state_mutex);

1163
	return 0;
1164 1165 1166
}
EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
/**
 * phylink_ethtool_nway_reset() - restart negotiation
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Restart negotiation for the phylink instance specified by @pl. This will
 * cause any attached phy to restart negotiation with the link partner, and
 * if the MAC is in a BaseX mode, the MAC will also be requested to restart
 * negotiation.
 *
 * Returns zero on success, or negative error code.
 */
1178 1179 1180 1181
int phylink_ethtool_nway_reset(struct phylink *pl)
{
	int ret = 0;

1182
	ASSERT_RTNL();
1183 1184 1185 1186 1187 1188 1189 1190 1191

	if (pl->phydev)
		ret = phy_restart_aneg(pl->phydev);
	phylink_mac_an_restart(pl);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);

1192 1193 1194 1195 1196
/**
 * phylink_ethtool_get_pauseparam() - get the current pause parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @pause: a pointer to a &struct ethtool_pauseparam
 */
1197 1198 1199
void phylink_ethtool_get_pauseparam(struct phylink *pl,
				    struct ethtool_pauseparam *pause)
{
1200
	ASSERT_RTNL();
1201 1202 1203 1204 1205 1206 1207

	pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
	pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
	pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);

1208 1209 1210 1211 1212
/**
 * phylink_ethtool_set_pauseparam() - set the current pause parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @pause: a pointer to a &struct ethtool_pauseparam
 */
1213 1214 1215 1216 1217
int phylink_ethtool_set_pauseparam(struct phylink *pl,
				   struct ethtool_pauseparam *pause)
{
	struct phylink_link_state *config = &pl->link_config;

1218
	ASSERT_RTNL();
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250

	if (!phylink_test(pl->supported, Pause) &&
	    !phylink_test(pl->supported, Asym_Pause))
		return -EOPNOTSUPP;

	if (!phylink_test(pl->supported, Asym_Pause) &&
	    !pause->autoneg && pause->rx_pause != pause->tx_pause)
		return -EINVAL;

	config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);

	if (pause->autoneg)
		config->pause |= MLO_PAUSE_AN;
	if (pause->rx_pause)
		config->pause |= MLO_PAUSE_RX;
	if (pause->tx_pause)
		config->pause |= MLO_PAUSE_TX;

	if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
		switch (pl->link_an_mode) {
		case MLO_AN_PHY:
			/* Silently mark the carrier down, and then trigger a resolve */
			netif_carrier_off(pl->netdev);
			phylink_run_resolve(pl);
			break;

		case MLO_AN_FIXED:
			/* Should we allow fixed links to change against the config? */
			phylink_resolve_flow(pl, config);
			phylink_mac_config(pl, config);
			break;

1251
		case MLO_AN_INBAND:
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
			phylink_mac_config(pl, config);
			phylink_mac_an_restart(pl);
			break;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
/**
 * phylink_ethtool_get_eee_err() - read the energy efficient ethernet error
 *   counter
 * @pl: a pointer to a &struct phylink returned from phylink_create().
 *
 * Read the Energy Efficient Ethernet error counter from the PHY associated
 * with the phylink instance specified by @pl.
 *
 * Returns positive error counter value, or negative error code.
 */
1272 1273 1274 1275
int phylink_get_eee_err(struct phylink *pl)
{
	int ret = 0;

1276
	ASSERT_RTNL();
1277 1278 1279 1280 1281 1282 1283 1284

	if (pl->phydev)
		ret = phy_get_eee_err(pl->phydev);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_get_eee_err);

1285 1286 1287 1288 1289
/**
 * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @eee: a pointer to a &struct ethtool_eee for the read parameters
 */
1290 1291 1292 1293
int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
{
	int ret = -EOPNOTSUPP;

1294
	ASSERT_RTNL();
1295 1296 1297 1298 1299 1300 1301 1302

	if (pl->phydev)
		ret = phy_ethtool_get_eee(pl->phydev, eee);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);

1303 1304 1305 1306 1307
/**
 * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @eee: a pointer to a &struct ethtool_eee for the desired parameters
 */
1308 1309 1310 1311
int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
{
	int ret = -EOPNOTSUPP;

1312
	ASSERT_RTNL();
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347

	if (pl->phydev)
		ret = phy_ethtool_set_eee(pl->phydev, eee);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);

/* This emulates MII registers for a fixed-mode phy operating as per the
 * passed in state. "aneg" defines if we report negotiation is possible.
 *
 * FIXME: should deal with negotiation state too.
 */
static int phylink_mii_emul_read(struct net_device *ndev, unsigned int reg,
				 struct phylink_link_state *state, bool aneg)
{
	struct fixed_phy_status fs;
	int val;

	fs.link = state->link;
	fs.speed = state->speed;
	fs.duplex = state->duplex;
	fs.pause = state->pause & MLO_PAUSE_SYM;
	fs.asym_pause = state->pause & MLO_PAUSE_ASYM;

	val = swphy_read_reg(reg, &fs);
	if (reg == MII_BMSR) {
		if (!state->an_complete)
			val &= ~BMSR_ANEGCOMPLETE;
		if (!aneg)
			val &= ~BMSR_ANEGCAPABLE;
	}
	return val;
}

1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
			    unsigned int reg)
{
	struct phy_device *phydev = pl->phydev;
	int prtad, devad;

	if (mdio_phy_id_is_c45(phy_id)) {
		prtad = mdio_phy_id_prtad(phy_id);
		devad = mdio_phy_id_devad(phy_id);
		devad = MII_ADDR_C45 | devad << 16 | reg;
	} else if (phydev->is_c45) {
		switch (reg) {
		case MII_BMCR:
		case MII_BMSR:
		case MII_PHYSID1:
		case MII_PHYSID2:
			devad = __ffs(phydev->c45_ids.devices_in_package);
			break;
		case MII_ADVERTISE:
		case MII_LPA:
			if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
				return -EINVAL;
			devad = MDIO_MMD_AN;
			if (reg == MII_ADVERTISE)
				reg = MDIO_AN_ADVERTISE;
			else
				reg = MDIO_AN_LPA;
			break;
		default:
			return -EINVAL;
		}
		prtad = phy_id;
		devad = MII_ADDR_C45 | devad << 16 | reg;
	} else {
		prtad = phy_id;
		devad = reg;
	}
	return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
}

static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
			     unsigned int reg, unsigned int val)
{
	struct phy_device *phydev = pl->phydev;
	int prtad, devad;

	if (mdio_phy_id_is_c45(phy_id)) {
		prtad = mdio_phy_id_prtad(phy_id);
		devad = mdio_phy_id_devad(phy_id);
		devad = MII_ADDR_C45 | devad << 16 | reg;
	} else if (phydev->is_c45) {
		switch (reg) {
		case MII_BMCR:
		case MII_BMSR:
		case MII_PHYSID1:
		case MII_PHYSID2:
			devad = __ffs(phydev->c45_ids.devices_in_package);
			break;
		case MII_ADVERTISE:
		case MII_LPA:
			if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
				return -EINVAL;
			devad = MDIO_MMD_AN;
			if (reg == MII_ADVERTISE)
				reg = MDIO_AN_ADVERTISE;
			else
				reg = MDIO_AN_LPA;
			break;
		default:
			return -EINVAL;
		}
		prtad = phy_id;
		devad = MII_ADDR_C45 | devad << 16 | reg;
	} else {
		prtad = phy_id;
		devad = reg;
	}

	return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
}

1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
			    unsigned int reg)
{
	struct phylink_link_state state;
	int val = 0xffff;

	switch (pl->link_an_mode) {
	case MLO_AN_FIXED:
		if (phy_id == 0) {
			phylink_get_fixed_state(pl, &state);
			val = phylink_mii_emul_read(pl->netdev, reg, &state,
						    true);
		}
		break;

	case MLO_AN_PHY:
		return -EOPNOTSUPP;

1447
	case MLO_AN_INBAND:
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
		if (phy_id == 0) {
			val = phylink_get_mac_state(pl, &state);
			if (val < 0)
				return val;

			val = phylink_mii_emul_read(pl->netdev, reg, &state,
						    true);
		}
		break;
	}

	return val & 0xffff;
}

static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
			     unsigned int reg, unsigned int val)
{
	switch (pl->link_an_mode) {
	case MLO_AN_FIXED:
		break;

	case MLO_AN_PHY:
		return -EOPNOTSUPP;

1472
	case MLO_AN_INBAND:
1473 1474 1475 1476 1477 1478
		break;
	}

	return 0;
}

1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
/**
 * phylink_mii_ioctl() - generic mii ioctl interface
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @ifr: a pointer to a &struct ifreq for socket ioctls
 * @cmd: ioctl cmd to execute
 *
 * Perform the specified MII ioctl on the PHY attached to the phylink instance
 * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
 *
 * Returns: zero on success or negative error code.
 *
 * %SIOCGMIIPHY:
 *  read register from the current PHY.
 * %SIOCGMIIREG:
 *  read register from the specified PHY.
 * %SIOCSMIIREG:
 *  set a register on the specified PHY.
 */
1497 1498
int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
{
1499 1500
	struct mii_ioctl_data *mii = if_mii(ifr);
	int  ret;
1501

1502
	ASSERT_RTNL();
1503

1504
	if (pl->phydev) {
1505
		/* PHYs only exist for MLO_AN_PHY and SGMII */
1506 1507 1508
		switch (cmd) {
		case SIOCGMIIPHY:
			mii->phy_id = pl->phydev->mdio.addr;
1509
			/* fall through */
1510 1511 1512 1513 1514 1515 1516 1517

		case SIOCGMIIREG:
			ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
			if (ret >= 0) {
				mii->val_out = ret;
				ret = 0;
			}
			break;
1518

1519 1520 1521 1522 1523 1524 1525 1526
		case SIOCSMIIREG:
			ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
						mii->val_in);
			break;

		default:
			ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
			break;
1527
		}
1528 1529 1530 1531
	} else {
		switch (cmd) {
		case SIOCGMIIPHY:
			mii->phy_id = 0;
1532
			/* fall through */
1533 1534 1535 1536 1537 1538 1539 1540

		case SIOCGMIIREG:
			ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
			if (ret >= 0) {
				mii->val_out = ret;
				ret = 0;
			}
			break;
1541

1542 1543 1544 1545
		case SIOCSMIIREG:
			ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
						mii->val_in);
			break;
1546

1547 1548 1549 1550
		default:
			ret = -EOPNOTSUPP;
			break;
		}
1551 1552 1553 1554 1555 1556
	}

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_mii_ioctl);

1557 1558 1559 1560 1561 1562 1563
static int phylink_sfp_module_insert(void *upstream,
				     const struct sfp_eeprom_id *id)
{
	struct phylink *pl = upstream;
	__ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
	struct phylink_link_state config;
	phy_interface_t iface;
1564
	int ret = 0;
1565 1566 1567
	bool changed;
	u8 port;

1568
	ASSERT_RTNL();
1569

1570 1571
	sfp_parse_support(pl->sfp_bus, id, support);
	port = sfp_parse_port(pl->sfp_bus, id, support);
1572 1573 1574

	memset(&config, 0, sizeof(config));
	linkmode_copy(config.advertising, support);
1575
	config.interface = PHY_INTERFACE_MODE_NA;
1576 1577 1578 1579 1580 1581 1582
	config.speed = SPEED_UNKNOWN;
	config.duplex = DUPLEX_UNKNOWN;
	config.pause = MLO_PAUSE_AN;
	config.an_enabled = pl->link_config.an_enabled;

	/* Ignore errors if we're expecting a PHY to attach later */
	ret = phylink_validate(pl, support, &config);
1583 1584 1585 1586 1587 1588 1589 1590 1591
	if (ret) {
		netdev_err(pl->netdev, "validation with support %*pb failed: %d\n",
			   __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
		return ret;
	}

	iface = sfp_select_interface(pl->sfp_bus, id, config.advertising);
	if (iface == PHY_INTERFACE_MODE_NA) {
		netdev_err(pl->netdev,
1592
			   "selection of interface failed, advertisement %*pb\n",
1593 1594 1595 1596 1597 1598
			   __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
		return -EINVAL;
	}

	config.interface = iface;
	ret = phylink_validate(pl, support, &config);
1599 1600
	if (ret) {
		netdev_err(pl->netdev, "validation of %s/%s with support %*pb failed: %d\n",
1601 1602
			   phylink_an_mode_str(MLO_AN_INBAND),
			   phy_modes(config.interface),
1603 1604 1605 1606 1607
			   __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
		return ret;
	}

	netdev_dbg(pl->netdev, "requesting link mode %s/%s with support %*pb\n",
1608 1609
		   phylink_an_mode_str(MLO_AN_INBAND),
		   phy_modes(config.interface),
1610 1611
		   __ETHTOOL_LINK_MODE_MASK_NBITS, support);

1612
	if (phy_interface_mode_is_8023z(iface) && pl->phydev)
1613 1614 1615 1616 1617 1618 1619 1620 1621
		return -EINVAL;

	changed = !bitmap_equal(pl->supported, support,
				__ETHTOOL_LINK_MODE_MASK_NBITS);
	if (changed) {
		linkmode_copy(pl->supported, support);
		linkmode_copy(pl->link_config.advertising, config.advertising);
	}

1622
	if (pl->link_an_mode != MLO_AN_INBAND ||
1623 1624
	    pl->link_config.interface != config.interface) {
		pl->link_config.interface = config.interface;
1625
		pl->link_an_mode = MLO_AN_INBAND;
1626 1627 1628 1629

		changed = true;

		netdev_info(pl->netdev, "switched to %s/%s link mode\n",
1630
			    phylink_an_mode_str(MLO_AN_INBAND),
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
			    phy_modes(config.interface));
	}

	pl->link_port = port;

	if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
				 &pl->phylink_disable_state))
		phylink_mac_config(pl, &pl->link_config);

	return ret;
}

static void phylink_sfp_link_down(void *upstream)
{
	struct phylink *pl = upstream;

1647
	ASSERT_RTNL();
1648

1649
	phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
1650 1651 1652 1653 1654 1655
}

static void phylink_sfp_link_up(void *upstream)
{
	struct phylink *pl = upstream;

1656
	ASSERT_RTNL();
1657 1658 1659 1660 1661 1662 1663

	clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
	phylink_run_resolve(pl);
}

static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
{
1664 1665 1666
	struct phylink *pl = upstream;

	return __phylink_connect_phy(upstream, phy, pl->link_config.interface);
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
}

static void phylink_sfp_disconnect_phy(void *upstream)
{
	phylink_disconnect_phy(upstream);
}

static const struct sfp_upstream_ops sfp_phylink_ops = {
	.module_insert = phylink_sfp_module_insert,
	.link_up = phylink_sfp_link_up,
	.link_down = phylink_sfp_link_down,
	.connect_phy = phylink_sfp_connect_phy,
	.disconnect_phy = phylink_sfp_disconnect_phy,
};

1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
/* Helpers for MAC drivers */

/**
 * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
 * @state: a pointer to a &struct phylink_link_state
 *
 * Inspect the interface mode, advertising mask or forced speed and
 * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
 * the interface mode to suit.  @state->interface is appropriately
 * updated, and the advertising mask has the "other" baseX_Full flag
 * cleared.
 */
void phylink_helper_basex_speed(struct phylink_link_state *state)
{
	if (phy_interface_mode_is_8023z(state->interface)) {
		bool want_2500 = state->an_enabled ?
			phylink_test(state->advertising, 2500baseX_Full) :
			state->speed == SPEED_2500;

		if (want_2500) {
			phylink_clear(state->advertising, 1000baseX_Full);
			state->interface = PHY_INTERFACE_MODE_2500BASEX;
		} else {
			phylink_clear(state->advertising, 2500baseX_Full);
			state->interface = PHY_INTERFACE_MODE_1000BASEX;
		}
	}
}
EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);

1712
MODULE_LICENSE("GPL");