phylink: add documentation for kernel APIs
Add kernel-doc documentation for phylink kernel APIs, and link it into the networking kapi documentation under "Network device support". Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King
David S. Miller
Родитель
85b43945cf
Коммит
8796c8923d
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@ -145,3 +145,15 @@ PHY Support
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.. kernel-doc:: drivers/net/phy/mdio_bus.c
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:internal:
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PHYLINK
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-------
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PHYLINK interfaces traditional network drivers with PHYLIB, fixed-links,
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and SFF modules (eg, hot-pluggable SFP) that may contain PHYs. PHYLINK
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provides management of the link state and link modes.
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.. kernel-doc:: include/linux/phylink.h
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:internal:
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.. kernel-doc:: drivers/net/phy/phylink.c
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@ -36,7 +36,11 @@ enum {
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PHYLINK_DISABLE_LINK,
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};
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/**
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* struct phylink - internal data type for phylink
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*/
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struct phylink {
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/* private: */
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struct net_device *netdev;
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const struct phylink_mac_ops *ops;
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@ -87,6 +91,13 @@ static inline bool linkmode_empty(const unsigned long *src)
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return bitmap_empty(src, __ETHTOOL_LINK_MODE_MASK_NBITS);
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}
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/**
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* phylink_set_port_modes() - set the port type modes in the ethtool mask
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* @mask: ethtool link mode mask
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*
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* Sets all the port type modes in the ethtool mask. MAC drivers should
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* use this in their 'validate' callback.
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*/
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void phylink_set_port_modes(unsigned long *mask)
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{
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phylink_set(mask, TP);
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@ -496,6 +507,19 @@ static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
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return 0;
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}
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/**
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* phylink_create() - create a phylink instance
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* @ndev: a pointer to the &struct net_device
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* @np: a pointer to a &struct device_node describing the network interface
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* @iface: the desired link mode defined by &typedef phy_interface_t
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* @ops: a pointer to a &struct phylink_mac_ops for the MAC.
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*
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* Create a new phylink instance, and parse the link parameters found in @np.
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* This will parse in-band modes, fixed-link or SFP configuration.
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*
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* Returns a pointer to a &struct phylink, or an error-pointer value. Users
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* must use IS_ERR() to check for errors from this function.
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*/
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struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
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phy_interface_t iface,
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const struct phylink_mac_ops *ops)
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@ -548,6 +572,13 @@ struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
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}
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EXPORT_SYMBOL_GPL(phylink_create);
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/**
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* phylink_destroy() - cleanup and destroy the phylink instance
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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*
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* Destroy a phylink instance. Any PHY that has been attached must have been
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* cleaned up via phylink_disconnect_phy() prior to calling this function.
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*/
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void phylink_destroy(struct phylink *pl)
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{
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if (pl->sfp_bus)
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@ -644,6 +675,21 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy)
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return 0;
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}
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/**
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* phylink_connect_phy() - connect a PHY to the phylink instance
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @phy: a pointer to a &struct phy_device.
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*
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* Connect @phy to the phylink instance specified by @pl by calling
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* phy_attach_direct(). Configure the @phy according to the MAC driver's
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* capabilities, start the PHYLIB state machine and enable any interrupts
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* that the PHY supports.
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*
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* This updates the phylink's ethtool supported and advertising link mode
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* masks.
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*
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* Returns 0 on success or a negative errno.
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*/
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int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
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{
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int ret;
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@ -665,6 +711,17 @@ int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
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}
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EXPORT_SYMBOL_GPL(phylink_connect_phy);
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/**
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* phylink_of_phy_connect() - connect the PHY specified in the DT mode.
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @dn: a pointer to a &struct device_node.
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*
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* Connect the phy specified in the device node @dn to the phylink instance
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* specified by @pl. Actions specified in phylink_connect_phy() will be
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* performed.
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*
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* Returns 0 on success or a negative errno.
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*/
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int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
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{
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struct device_node *phy_node;
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@ -706,6 +763,13 @@ int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
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}
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EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
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/**
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* phylink_disconnect_phy() - disconnect any PHY attached to the phylink
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* instance.
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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*
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* Disconnect any current PHY from the phylink instance described by @pl.
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*/
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void phylink_disconnect_phy(struct phylink *pl)
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{
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struct phy_device *phy;
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@ -727,6 +791,14 @@ void phylink_disconnect_phy(struct phylink *pl)
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}
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EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
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/**
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* phylink_mac_change() - notify phylink of a change in MAC state
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @up: indicates whether the link is currently up.
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*
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* The MAC driver should call this driver when the state of its link
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* changes (eg, link failure, new negotiation results, etc.)
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*/
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void phylink_mac_change(struct phylink *pl, bool up)
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{
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if (!up)
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@ -736,6 +808,14 @@ void phylink_mac_change(struct phylink *pl, bool up)
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}
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EXPORT_SYMBOL_GPL(phylink_mac_change);
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/**
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* phylink_start() - start a phylink instance
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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*
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* Start the phylink instance specified by @pl, configuring the MAC for the
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* desired link mode(s) and negotiation style. This should be called from the
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* network device driver's &struct net_device_ops ndo_open() method.
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*/
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void phylink_start(struct phylink *pl)
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{
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WARN_ON(!lockdep_rtnl_is_held());
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@ -767,6 +847,15 @@ void phylink_start(struct phylink *pl)
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}
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EXPORT_SYMBOL_GPL(phylink_start);
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/**
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* phylink_stop() - stop a phylink instance
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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*
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* Stop the phylink instance specified by @pl. This should be called from the
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* network device driver's &struct net_device_ops ndo_stop() method. The
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* network device's carrier state should not be changed prior to calling this
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* function.
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*/
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void phylink_stop(struct phylink *pl)
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{
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WARN_ON(!lockdep_rtnl_is_held());
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@ -782,6 +871,15 @@ void phylink_stop(struct phylink *pl)
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}
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EXPORT_SYMBOL_GPL(phylink_stop);
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/**
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* phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
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*
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* Read the wake on lan parameters from the PHY attached to the phylink
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* instance specified by @pl. If no PHY is currently attached, report no
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* support for wake on lan.
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*/
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void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
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{
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WARN_ON(!lockdep_rtnl_is_held());
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@ -794,6 +892,17 @@ void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
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/**
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* phylink_ethtool_set_wol() - set wake on lan parameters
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
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*
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* Set the wake on lan parameters for the PHY attached to the phylink
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* instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
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* error.
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*
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* Returns zero on success or negative errno code.
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*/
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int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
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{
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int ret = -EOPNOTSUPP;
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@ -829,6 +938,15 @@ static void phylink_get_ksettings(const struct phylink_link_state *state,
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AUTONEG_DISABLE;
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}
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/**
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* phylink_ethtool_ksettings_get() - get the current link settings
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
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*
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* Read the current link settings for the phylink instance specified by @pl.
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* This will be the link settings read from the MAC, PHY or fixed link
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* settings depending on the current negotiation mode.
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*/
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int phylink_ethtool_ksettings_get(struct phylink *pl,
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struct ethtool_link_ksettings *kset)
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{
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@ -875,6 +993,11 @@ int phylink_ethtool_ksettings_get(struct phylink *pl,
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
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/**
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* phylink_ethtool_ksettings_set() - set the link settings
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
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*/
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int phylink_ethtool_ksettings_set(struct phylink *pl,
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const struct ethtool_link_ksettings *kset)
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{
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@ -968,6 +1091,17 @@ int phylink_ethtool_ksettings_set(struct phylink *pl,
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
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/**
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* phylink_ethtool_nway_reset() - restart negotiation
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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*
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* Restart negotiation for the phylink instance specified by @pl. This will
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* cause any attached phy to restart negotiation with the link partner, and
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* if the MAC is in a BaseX mode, the MAC will also be requested to restart
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* negotiation.
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*
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* Returns zero on success, or negative error code.
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*/
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int phylink_ethtool_nway_reset(struct phylink *pl)
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{
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int ret = 0;
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@ -982,6 +1116,11 @@ int phylink_ethtool_nway_reset(struct phylink *pl)
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
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/**
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* phylink_ethtool_get_pauseparam() - get the current pause parameters
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @pause: a pointer to a &struct ethtool_pauseparam
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*/
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void phylink_ethtool_get_pauseparam(struct phylink *pl,
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struct ethtool_pauseparam *pause)
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{
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@ -993,6 +1132,11 @@ void phylink_ethtool_get_pauseparam(struct phylink *pl,
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
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/**
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* phylink_ethtool_set_pauseparam() - set the current pause parameters
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @pause: a pointer to a &struct ethtool_pauseparam
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*/
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int phylink_ethtool_set_pauseparam(struct phylink *pl,
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struct ethtool_pauseparam *pause)
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{
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@ -1070,6 +1214,16 @@ int phylink_ethtool_get_module_eeprom(struct phylink *pl,
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_eeprom);
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/**
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* phylink_ethtool_get_eee_err() - read the energy efficient ethernet error
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* counter
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* @pl: a pointer to a &struct phylink returned from phylink_create().
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*
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* Read the Energy Efficient Ethernet error counter from the PHY associated
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* with the phylink instance specified by @pl.
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*
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* Returns positive error counter value, or negative error code.
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*/
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int phylink_get_eee_err(struct phylink *pl)
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{
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int ret = 0;
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@ -1083,6 +1237,11 @@ int phylink_get_eee_err(struct phylink *pl)
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}
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EXPORT_SYMBOL_GPL(phylink_get_eee_err);
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/**
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* phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @eee: a pointer to a &struct ethtool_eee for the read parameters
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*/
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int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
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{
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int ret = -EOPNOTSUPP;
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@ -1096,6 +1255,11 @@ int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
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}
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EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
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/**
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* phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @eee: a pointer to a &struct ethtool_eee for the desired parameters
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*/
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int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
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{
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int ret = -EOPNOTSUPP;
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@ -1267,6 +1431,24 @@ static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
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return 0;
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}
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/**
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* phylink_mii_ioctl() - generic mii ioctl interface
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* @pl: a pointer to a &struct phylink returned from phylink_create()
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* @ifr: a pointer to a &struct ifreq for socket ioctls
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* @cmd: ioctl cmd to execute
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*
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* Perform the specified MII ioctl on the PHY attached to the phylink instance
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* specified by @pl. If no PHY is attached, emulate the presence of the PHY.
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*
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* Returns: zero on success or negative error code.
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*
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* %SIOCGMIIPHY:
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* read register from the current PHY.
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* %SIOCGMIIREG:
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* read register from the specified PHY.
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* %SIOCSMIIREG:
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* set a register on the specified PHY.
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*/
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int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
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{
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struct mii_ioctl_data *mii = if_mii(ifr);
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@ -28,10 +28,23 @@ static inline bool phylink_autoneg_inband(unsigned int mode)
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return mode == MLO_AN_INBAND;
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}
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/**
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* struct phylink_link_state - link state structure
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* @advertising: ethtool bitmask containing advertised link modes
|
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* @lp_advertising: ethtool bitmask containing link partner advertised link
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* modes
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* @interface: link &typedef phy_interface_t mode
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* @speed: link speed, one of the SPEED_* constants.
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* @duplex: link duplex mode, one of DUPLEX_* constants.
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* @pause: link pause state, described by MLO_PAUSE_* constants.
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* @link: true if the link is up.
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* @an_enabled: true if autonegotiation is enabled/desired.
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* @an_complete: true if autonegotiation has completed.
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*/
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struct phylink_link_state {
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__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
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__ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising);
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phy_interface_t interface; /* PHY_INTERFACE_xxx */
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phy_interface_t interface;
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int speed;
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int duplex;
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int pause;
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@ -40,61 +53,135 @@ struct phylink_link_state {
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unsigned int an_complete:1;
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};
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/**
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* struct phylink_mac_ops - MAC operations structure.
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* @validate: Validate and update the link configuration.
|
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* @mac_link_state: Read the current link state from the hardware.
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* @mac_config: configure the MAC for the selected mode and state.
|
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* @mac_an_restart: restart 802.3z BaseX autonegotiation.
|
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* @mac_link_down: take the link down.
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* @mac_link_up: allow the link to come up.
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*
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* The individual methods are described more fully below.
|
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*/
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struct phylink_mac_ops {
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/**
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* validate: validate and update the link configuration
|
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* @ndev: net_device structure associated with MAC
|
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* @config: configuration to validate
|
||||
*
|
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* Update the %config->supported and %config->advertised masks
|
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* clearing bits that can not be supported.
|
||||
*
|
||||
* Note: the PHY may be able to transform from one connection
|
||||
* technology to another, so, eg, don't clear 1000BaseX just
|
||||
* because the MAC is unable to support it. This is more about
|
||||
* clearing unsupported speeds and duplex settings.
|
||||
*
|
||||
* If the %config->interface mode is %PHY_INTERFACE_MODE_1000BASEX
|
||||
* or %PHY_INTERFACE_MODE_2500BASEX, select the appropriate mode
|
||||
* based on %config->advertised and/or %config->speed.
|
||||
*/
|
||||
void (*validate)(struct net_device *ndev, unsigned long *supported,
|
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struct phylink_link_state *state);
|
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|
||||
/* Read the current link state from the hardware */
|
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int (*mac_link_state)(struct net_device *, struct phylink_link_state *);
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||||
|
||||
/* Configure the MAC */
|
||||
/**
|
||||
* mac_config: configure the MAC for the selected mode and state
|
||||
* @ndev: net_device structure for the MAC
|
||||
* @mode: one of MLO_AN_FIXED, MLO_AN_PHY, MLO_AN_INBAND
|
||||
* @state: state structure
|
||||
*
|
||||
* The action performed depends on the currently selected mode:
|
||||
*
|
||||
* %MLO_AN_FIXED, %MLO_AN_PHY:
|
||||
* set the specified speed, duplex, pause mode, and phy interface
|
||||
* mode in the provided @state.
|
||||
* %MLO_AN_INBAND:
|
||||
* place the link in an inband negotiation mode (such as
|
||||
* 1000base-X or Cisco SGMII mode depending on the phy interface
|
||||
* mode), advertising the parameters given in advertising in @state.
|
||||
*/
|
||||
int (*mac_link_state)(struct net_device *ndev,
|
||||
struct phylink_link_state *state);
|
||||
void (*mac_config)(struct net_device *ndev, unsigned int mode,
|
||||
const struct phylink_link_state *state);
|
||||
|
||||
/**
|
||||
* mac_an_restart: restart 802.3z BaseX autonegotiation
|
||||
* @ndev: net_device structure for the MAC
|
||||
*/
|
||||
void (*mac_an_restart)(struct net_device *ndev);
|
||||
|
||||
void (*mac_link_down)(struct net_device *, unsigned int mode);
|
||||
void (*mac_link_up)(struct net_device *, unsigned int mode,
|
||||
struct phy_device *);
|
||||
void (*mac_link_down)(struct net_device *ndev, unsigned int mode);
|
||||
void (*mac_link_up)(struct net_device *ndev, unsigned int mode,
|
||||
struct phy_device *phy);
|
||||
};
|
||||
|
||||
#if 0 /* For kernel-doc purposes only. */
|
||||
/**
|
||||
* validate - Validate and update the link configuration
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
* @supported: ethtool bitmask for supported link modes.
|
||||
* @state: a pointer to a &struct phylink_link_state.
|
||||
*
|
||||
* Clear bits in the @supported and @state->advertising masks that
|
||||
* are not supportable by the MAC.
|
||||
*
|
||||
* Note that the PHY may be able to transform from one connection
|
||||
* technology to another, so, eg, don't clear 1000BaseX just
|
||||
* because the MAC is unable to BaseX mode. This is more about
|
||||
* clearing unsupported speeds and duplex settings.
|
||||
*
|
||||
* If the @state->interface mode is %PHY_INTERFACE_MODE_1000BASEX
|
||||
* or %PHY_INTERFACE_MODE_2500BASEX, select the appropriate mode
|
||||
* based on @state->advertising and/or @state->speed and update
|
||||
* @state->interface accordingly.
|
||||
*/
|
||||
void validate(struct net_device *ndev, unsigned long *supported,
|
||||
struct phylink_link_state *state);
|
||||
|
||||
/**
|
||||
* mac_link_state() - Read the current link state from the hardware
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
* @state: a pointer to a &struct phylink_link_state.
|
||||
*
|
||||
* Read the current link state from the MAC, reporting the current
|
||||
* speed in @state->speed, duplex mode in @state->duplex, pause mode
|
||||
* in @state->pause using the %MLO_PAUSE_RX and %MLO_PAUSE_TX bits,
|
||||
* negotiation completion state in @state->an_complete, and link
|
||||
* up state in @state->link.
|
||||
*/
|
||||
int mac_link_state(struct net_device *ndev,
|
||||
struct phylink_link_state *state);
|
||||
|
||||
/**
|
||||
* mac_config() - configure the MAC for the selected mode and state
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
* @mode: one of %MLO_AN_FIXED, %MLO_AN_PHY, %MLO_AN_INBAND.
|
||||
* @state: a pointer to a &struct phylink_link_state.
|
||||
*
|
||||
* The action performed depends on the currently selected mode:
|
||||
*
|
||||
* %MLO_AN_FIXED, %MLO_AN_PHY:
|
||||
* Configure the specified @state->speed, @state->duplex and
|
||||
* @state->pause (%MLO_PAUSE_TX / %MLO_PAUSE_RX) mode.
|
||||
*
|
||||
* %MLO_AN_INBAND:
|
||||
* place the link in an inband negotiation mode (such as 802.3z
|
||||
* 1000base-X or Cisco SGMII mode depending on the @state->interface
|
||||
* mode). In both cases, link state management (whether the link
|
||||
* is up or not) is performed by the MAC, and reported via the
|
||||
* mac_link_state() callback. Changes in link state must be made
|
||||
* by calling phylink_mac_change().
|
||||
*
|
||||
* If in 802.3z mode, the link speed is fixed, dependent on the
|
||||
* @state->interface. Duplex is negotiated, and pause is advertised
|
||||
* according to @state->an_enabled, @state->pause and
|
||||
* @state->advertising flags. Beware of MACs which only support full
|
||||
* duplex at gigabit and higher speeds.
|
||||
*
|
||||
* If in Cisco SGMII mode, the link speed and duplex mode are passed
|
||||
* in the serial bitstream 16-bit configuration word, and the MAC
|
||||
* should be configured to read these bits and acknowledge the
|
||||
* configuration word. Nothing is advertised by the MAC. The MAC is
|
||||
* responsible for reading the configuration word and configuring
|
||||
* itself accordingly.
|
||||
*/
|
||||
void mac_config(struct net_device *ndev, unsigned int mode,
|
||||
const struct phylink_link_state *state);
|
||||
|
||||
/**
|
||||
* mac_an_restart() - restart 802.3z BaseX autonegotiation
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
*/
|
||||
void mac_an_restart(struct net_device *ndev);
|
||||
|
||||
/**
|
||||
* mac_link_down() - take the link down
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
* @mode: link autonegotiation mode
|
||||
*
|
||||
* If @mode is not an in-band negotiation mode (as defined by
|
||||
* phylink_autoneg_inband()), force the link down and disable any
|
||||
* Energy Efficient Ethernet MAC configuration.
|
||||
*/
|
||||
void mac_link_down(struct net_device *ndev, unsigned int mode);
|
||||
|
||||
/**
|
||||
* mac_link_up() - allow the link to come up
|
||||
* @ndev: a pointer to a &struct net_device for the MAC.
|
||||
* @mode: link autonegotiation mode
|
||||
* @phy: any attached phy
|
||||
*
|
||||
* If @mode is not an in-band negotiation mode (as defined by
|
||||
* phylink_autoneg_inband()), allow the link to come up. If @phy
|
||||
* is non-%NULL, configure Energy Efficient Ethernet by calling
|
||||
* phy_init_eee() and perform appropriate MAC configuration for EEE.
|
||||
*/
|
||||
void mac_link_up(struct net_device *ndev, unsigned int mode,
|
||||
struct phy_device *phy);
|
||||
#endif
|
||||
|
||||
struct phylink *phylink_create(struct net_device *, struct device_node *,
|
||||
phy_interface_t iface, const struct phylink_mac_ops *ops);
|
||||
void phylink_destroy(struct phylink *);
|
||||
|
|
|
|||
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