/**
* 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.
*/
void phylink_start(struct phylink *pl)
{
ASSERT_RTNL();
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));
/* Always set the carrier off */
netif_carrier_off(pl->netdev);
/* 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 advertisement for Serdes links.
*/
phylink_resolve_flow(pl, &pl->link_config);
phylink_mac_config(pl, &pl->link_config);
/* 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);
clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
phylink_run_resolve(pl);
if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
mod_timer(&pl->link_poll, jiffies + HZ);
if (pl->sfp_bus)
sfp_upstream_start(pl->sfp_bus);
if (pl->phydev)
phy_start(pl->phydev);
}
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;
}
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);
}
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_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_up(pl, &link_state);
break;
case MLO_AN_FIXED:
phylink_get_fixed_state(pl, &link_state);
phylink_mac_config_up(pl, &link_state);
break;
case MLO_AN_INBAND:
phylink_get_mac_state(pl, &link_state);
/* If we have a phy, the "up" state is the union of
* both the PHY and the MAC */
if (pl->phydev)
link_state.link &= pl->phy_state.link;
/* Only update if the PHY link is up */
if (pl->phydev && pl->phy_state.link) {
link_state.interface = pl->phy_state.interface;
/* If we have a PHY, we need to update with
* the pause mode bits. */
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);
pl->ops->mac_link_down(ndev, pl->link_an_mode,
pl->phy_state.interface);
netdev_info(ndev, "Link is Down\n");
} else {
pl->ops->mac_link_up(ndev, pl->link_an_mode,
pl->phy_state.interface,
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);
}