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linux_dsm_epyc7002/drivers/net/phy/phylink.c
Dan Carpenter d18c2a1b15 phylink: Fix an uninitialized variable bug 
"ret" isn't necessarily initialized here.

Fixes: 9525ae8395 ("phylink: add phylink infrastructure")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-11 13:58:01 -07:00

1463 lines
36 KiB
C
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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>
#include <linux/workqueue.h>
#include "sfp.h"
#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,
PHYLINK_DISABLE_LINK,
};
struct phylink {
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;
struct mutex state_mutex;
struct phylink_link_state phy_state;
struct work_struct resolve;
bool mac_link_dropped;
struct sfp_bus *sfp_bus;
};
static inline void linkmode_zero(unsigned long *dst)
{
bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
static inline void linkmode_copy(unsigned long *dst, const unsigned long *src)
{
bitmap_copy(dst, src, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
static inline void linkmode_and(unsigned long *dst, const unsigned long *a,
const unsigned long *b)
{
bitmap_and(dst, a, b, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
static inline void linkmode_or(unsigned long *dst, const unsigned long *a,
const unsigned long *b)
{
bitmap_or(dst, a, b, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
static inline bool linkmode_empty(const unsigned long *src)
{
return bitmap_empty(src, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
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",
[MLO_AN_SGMII] = "SGMII",
[MLO_AN_8023Z] = "802.3z",
};
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;
}
static int phylink_parse_fixedlink(struct phylink *pl, struct device_node *np)
{
struct device_node *fixed_node;
const struct phy_setting *s;
struct gpio_desc *desc;
const __be32 *fixed_prop;
u32 speed;
int ret, len;
fixed_node = of_get_child_by_name(np, "fixed-link");
if (fixed_node) {
ret = of_property_read_u32(fixed_node, "speed", &speed);
pl->link_config.speed = speed;
pl->link_config.duplex = DUPLEX_HALF;
if (of_property_read_bool(fixed_node, "full-duplex"))
pl->link_config.duplex = DUPLEX_FULL;
/* We treat the "pause" and "asym-pause" terminology as
* defining the link partner's ability. */
if (of_property_read_bool(fixed_node, "pause"))
pl->link_config.pause |= MLO_PAUSE_SYM;
if (of_property_read_bool(fixed_node, "asym-pause"))
pl->link_config.pause |= MLO_PAUSE_ASYM;
if (ret == 0) {
desc = fwnode_get_named_gpiod(&fixed_node->fwnode,
"link-gpios", 0,
GPIOD_IN, "?");
if (!IS_ERR(desc))
pl->link_gpio = desc;
else if (desc == ERR_PTR(-EPROBE_DEFER))
ret = -EPROBE_DEFER;
}
of_node_put(fixed_node);
if (ret)
return ret;
} else {
fixed_prop = of_get_property(np, "fixed-link", &len);
if (!fixed_prop) {
netdev_err(pl->netdev, "broken fixed-link?\n");
return -EINVAL;
}
if (len == 5 * sizeof(*fixed_prop)) {
pl->link_config.duplex = be32_to_cpu(fixed_prop[1]) ?
DUPLEX_FULL : DUPLEX_HALF;
pl->link_config.speed = be32_to_cpu(fixed_prop[2]);
if (be32_to_cpu(fixed_prop[3]))
pl->link_config.pause |= MLO_PAUSE_SYM;
if (be32_to_cpu(fixed_prop[4]))
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;
}
static int phylink_parse_mode(struct phylink *pl, struct device_node *np)
{
struct device_node *dn;
const char *managed;
dn = of_get_child_by_name(np, "fixed-link");
if (dn || of_find_property(np, "fixed-link", NULL))
pl->link_an_mode = MLO_AN_FIXED;
of_node_put(dn);
if (of_property_read_string(np, "managed", &managed) == 0 &&
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;
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);
pl->link_an_mode = MLO_AN_SGMII;
break;
case PHY_INTERFACE_MODE_1000BASEX:
phylink_set(pl->supported, 1000baseX_Full);
pl->link_an_mode = MLO_AN_8023Z;
break;
case PHY_INTERFACE_MODE_2500BASEX:
phylink_set(pl->supported, 2500baseX_Full);
pl->link_an_mode = MLO_AN_8023Z;
break;
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);
pl->link_an_mode = MLO_AN_SGMII;
break;
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 &&
(pl->link_config.interface == PHY_INTERFACE_MODE_1000BASEX ||
pl->link_config.interface == PHY_INTERFACE_MODE_2500BASEX))
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,
* which may be determined by a GPIO.
*/
static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
{
*state = pl->link_config;
if (pl->link_gpio)
state->link = !!gpiod_get_value(pl->link_gpio);
}
/* Flow control is resolved according to our and the link partners
* advertisments using the following drawn from the 802.3 specs:
* 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,
struct phylink_link_state *state)
{
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;
case MLO_AN_SGMII:
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;
case MLO_AN_8023Z:
phylink_get_mac_state(pl, &link_state);
break;
}
}
if (link_state.link != netif_carrier_ok(ndev)) {
if (!link_state.link) {
netif_carrier_off(ndev);
pl->ops->mac_link_down(ndev, pl->link_an_mode);
netdev_info(ndev, "Link is Down\n");
} else {
pl->ops->mac_link_up(ndev, pl->link_an_mode,
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);
}
static const struct sfp_upstream_ops sfp_phylink_ops;
static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
{
struct device_node *sfp_np;
sfp_np = of_parse_phandle(np, "sfp", 0);
if (!sfp_np)
return 0;
pl->sfp_bus = sfp_register_upstream(sfp_np, pl->netdev, pl,
&sfp_phylink_ops);
if (!pl->sfp_bus)
return -ENOMEM;
return 0;
}
struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
phy_interface_t iface, const struct phylink_mac_ops *ops)
{
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;
pl->link_port = PORT_MII;
pl->link_config.interface = iface;
pl->link_config.pause = MLO_PAUSE_AN;
pl->link_config.speed = SPEED_UNKNOWN;
pl->link_config.duplex = DUPLEX_UNKNOWN;
pl->ops = ops;
__set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
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);
ret = phylink_parse_mode(pl, np);
if (ret < 0) {
kfree(pl);
return ERR_PTR(ret);
}
if (pl->link_an_mode == MLO_AN_FIXED) {
ret = phylink_parse_fixedlink(pl, np);
if (ret < 0) {
kfree(pl);
return ERR_PTR(ret);
}
}
ret = phylink_register_sfp(pl, np);
if (ret < 0) {
kfree(pl);
return ERR_PTR(ret);
}
return pl;
}
EXPORT_SYMBOL_GPL(phylink_create);
void phylink_destroy(struct phylink *pl)
{
if (pl->sfp_bus)
sfp_unregister_upstream(pl->sfp_bus);
cancel_work_sync(&pl->resolve);
kfree(pl);
}
EXPORT_SYMBOL_GPL(phylink_destroy);
void phylink_phy_change(struct phy_device *phydev, bool up, bool do_carrier)
{
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",
phy_modes(phydev->interface),
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->netdev->phydev = phy;
pl->phydev = phy;
linkmode_copy(pl->supported, supported);
linkmode_copy(pl->link_config.advertising, config.advertising);
/* Restrict the phy advertisment according to the MAC support. */
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;
}
int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
{
int ret;
ret = phy_attach_direct(pl->netdev, phy, 0, pl->link_interface);
if (ret)
return ret;
ret = phylink_bringup_phy(pl, phy);
if (ret)
phy_detach(phy);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_connect_phy);
int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
{
struct device_node *phy_node;
struct phy_device *phy_dev;
int ret;
/* Fixed links are handled without needing a PHY */
if (pl->link_an_mode == MLO_AN_FIXED)
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) {
if (pl->link_an_mode == MLO_AN_PHY) {
netdev_err(pl->netdev, "unable to find PHY node\n");
return -ENODEV;
}
return 0;
}
phy_dev = of_phy_attach(pl->netdev, phy_node, 0, pl->link_interface);
/* 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);
void phylink_disconnect_phy(struct phylink *pl)
{
struct phy_device *phy;
WARN_ON(!lockdep_rtnl_is_held());
phy = pl->phydev;
if (phy) {
mutex_lock(&phy->lock);
mutex_lock(&pl->state_mutex);
pl->netdev->phydev = NULL;
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);
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);
void phylink_start(struct phylink *pl)
{
WARN_ON(!lockdep_rtnl_is_held());
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));
/* Apply the link configuration to the MAC when starting. This allows
* a fixed-link to start with the correct parameters, and also
* ensures that we set the appropriate advertisment for Serdes links.
*/
phylink_resolve_flow(pl, &pl->link_config);
phylink_mac_config(pl, &pl->link_config);
clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
phylink_run_resolve(pl);
if (pl->sfp_bus)
sfp_upstream_start(pl->sfp_bus);
if (pl->phydev)
phy_start(pl->phydev);
}
EXPORT_SYMBOL_GPL(phylink_start);
void phylink_stop(struct phylink *pl)
{
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev)
phy_stop(pl->phydev);
if (pl->sfp_bus)
sfp_upstream_stop(pl->sfp_bus);
set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
flush_work(&pl->resolve);
}
EXPORT_SYMBOL_GPL(phylink_stop);
void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
WARN_ON(!lockdep_rtnl_is_held());
wol->supported = 0;
wol->wolopts = 0;
if (pl->phydev)
phy_ethtool_get_wol(pl->phydev, wol);
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
int ret = -EOPNOTSUPP;
WARN_ON(!lockdep_rtnl_is_held());
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;
}
int phylink_ethtool_ksettings_get(struct phylink *pl,
struct ethtool_link_ksettings *kset)
{
struct phylink_link_state link_state;
WARN_ON(!lockdep_rtnl_is_held());
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;
case MLO_AN_SGMII:
/* If there is a phy attached, then use the reported
* settings from the phy with no modification.
*/
if (pl->phydev)
break;
case MLO_AN_8023Z:
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);
int phylink_ethtool_ksettings_set(struct phylink *pl,
const struct ethtool_link_ksettings *kset)
{
struct ethtool_link_ksettings our_kset;
struct phylink_link_state config;
int ret;
WARN_ON(!lockdep_rtnl_is_held());
if (kset->base.autoneg != AUTONEG_DISABLE &&
kset->base.autoneg != AUTONEG_ENABLE)
return -EINVAL;
config = pl->link_config;
/* Mask out unsupported advertisments */
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;
/* If autonegotiation is enabled, we must have an advertisment */
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);
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);
return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
int phylink_ethtool_nway_reset(struct phylink *pl)
{
int ret = 0;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev)
ret = phy_restart_aneg(pl->phydev);
phylink_mac_an_restart(pl);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
void phylink_ethtool_get_pauseparam(struct phylink *pl,
struct ethtool_pauseparam *pause)
{
WARN_ON(!lockdep_rtnl_is_held());
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);
int phylink_ethtool_set_pauseparam(struct phylink *pl,
struct ethtool_pauseparam *pause)
{
struct phylink_link_state *config = &pl->link_config;
WARN_ON(!lockdep_rtnl_is_held());
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;
case MLO_AN_SGMII:
case MLO_AN_8023Z:
phylink_mac_config(pl, config);
phylink_mac_an_restart(pl);
break;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
int phylink_ethtool_get_module_info(struct phylink *pl,
struct ethtool_modinfo *modinfo)
{
int ret = -EOPNOTSUPP;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->sfp_bus)
ret = sfp_get_module_info(pl->sfp_bus, modinfo);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_info);
int phylink_ethtool_get_module_eeprom(struct phylink *pl,
struct ethtool_eeprom *ee, u8 *buf)
{
int ret = -EOPNOTSUPP;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->sfp_bus)
ret = sfp_get_module_eeprom(pl->sfp_bus, ee, buf);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_eeprom);
int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
{
int ret = -EPROTONOSUPPORT;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev)
ret = phy_init_eee(pl->phydev, clk_stop_enable);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_init_eee);
int phylink_get_eee_err(struct phylink *pl)
{
int ret = 0;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev)
ret = phy_get_eee_err(pl->phydev);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_get_eee_err);
int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
{
int ret = -EOPNOTSUPP;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev)
ret = phy_ethtool_get_eee(pl->phydev, eee);
return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
{
int ret = -EOPNOTSUPP;
WARN_ON(!lockdep_rtnl_is_held());
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;
}
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);
}
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;
case MLO_AN_SGMII:
/* No phy, fall through to 8023z method */
case MLO_AN_8023Z:
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;
case MLO_AN_SGMII:
/* No phy, fall through to 8023z method */
case MLO_AN_8023Z:
break;
}
return 0;
}
int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
{
struct mii_ioctl_data *mii = if_mii(ifr);
int ret;
WARN_ON(!lockdep_rtnl_is_held());
if (pl->phydev) {
/* PHYs only exist for MLO_AN_PHY and MLO_AN_SGMII */
switch (cmd) {
case SIOCGMIIPHY:
mii->phy_id = pl->phydev->mdio.addr;
case SIOCGMIIREG:
ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
if (ret >= 0) {
mii->val_out = ret;
ret = 0;
}
break;
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;
}
} else {
switch (cmd) {
case SIOCGMIIPHY:
mii->phy_id = 0;
case SIOCGMIIREG:
ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
if (ret >= 0) {
mii->val_out = ret;
ret = 0;
}
break;
case SIOCSMIIREG:
ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
mii->val_in);
break;
default:
ret = -EOPNOTSUPP;
break;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
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;
int mode, ret = 0;
bool changed;
u8 port;
sfp_parse_support(pl->sfp_bus, id, support);
port = sfp_parse_port(pl->sfp_bus, id, support);
iface = sfp_parse_interface(pl->sfp_bus, id);
WARN_ON(!lockdep_rtnl_is_held());
switch (iface) {
case PHY_INTERFACE_MODE_SGMII:
mode = MLO_AN_SGMII;
break;
case PHY_INTERFACE_MODE_1000BASEX:
mode = MLO_AN_8023Z;
break;
default:
return -EINVAL;
}
memset(&config, 0, sizeof(config));
linkmode_copy(config.advertising, support);
config.interface = iface;
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);
if (ret) {
netdev_err(pl->netdev, "validation of %s/%s with support %*pb failed: %d\n",
phylink_an_mode_str(mode), phy_modes(config.interface),
__ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
return ret;
}
netdev_dbg(pl->netdev, "requesting link mode %s/%s with support %*pb\n",
phylink_an_mode_str(mode), phy_modes(config.interface),
__ETHTOOL_LINK_MODE_MASK_NBITS, support);
if (mode == MLO_AN_8023Z && pl->phydev)
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);
}
if (pl->link_an_mode != mode ||
pl->link_config.interface != config.interface) {
pl->link_config.interface = config.interface;
pl->link_an_mode = mode;
changed = true;
netdev_info(pl->netdev, "switched to %s/%s link mode\n",
phylink_an_mode_str(mode),
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;
WARN_ON(!lockdep_rtnl_is_held());
set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
flush_work(&pl->resolve);
netif_carrier_off(pl->netdev);
}
static void phylink_sfp_link_up(void *upstream)
{
struct phylink *pl = upstream;
WARN_ON(!lockdep_rtnl_is_held());
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)
{
return phylink_connect_phy(upstream, phy);
}
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,
};
MODULE_LICENSE("GPL");
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