dsa.h 9.78 KB
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/*
 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
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 * Copyright (c) 2008-2009 Marvell Semiconductor
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __LINUX_NET_DSA_H
#define __LINUX_NET_DSA_H

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#include <linux/if_ether.h>
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#include <linux/list.h>
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#include <linux/timer.h>
#include <linux/workqueue.h>
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#include <linux/of.h>
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#include <linux/phy.h>
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#include <linux/phy_fixed.h>
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#include <linux/ethtool.h>
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enum dsa_tag_protocol {
	DSA_TAG_PROTO_NONE = 0,
	DSA_TAG_PROTO_DSA,
	DSA_TAG_PROTO_TRAILER,
	DSA_TAG_PROTO_EDSA,
	DSA_TAG_PROTO_BRCM,
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	DSA_TAG_LAST,		/* MUST BE LAST */
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};
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#define DSA_MAX_SWITCHES	4
#define DSA_MAX_PORTS		12

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#define DSA_RTABLE_NONE		-1

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struct dsa_chip_data {
	/*
	 * How to access the switch configuration registers.
	 */
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	struct device	*host_dev;
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	int		sw_addr;

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	/* set to size of eeprom if supported by the switch */
	int		eeprom_len;

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	/* Device tree node pointer for this specific switch chip
	 * used during switch setup in case additional properties
	 * and resources needs to be used
	 */
	struct device_node *of_node;

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	/*
	 * The names of the switch's ports.  Use "cpu" to
	 * designate the switch port that the cpu is connected to,
	 * "dsa" to indicate that this port is a DSA link to
	 * another switch, NULL to indicate the port is unused,
	 * or any other string to indicate this is a physical port.
	 */
	char		*port_names[DSA_MAX_PORTS];
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	struct device_node *port_dn[DSA_MAX_PORTS];
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	/*
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	 * An array of which element [a] indicates which port on this
	 * switch should be used to send packets to that are destined
	 * for switch a. Can be NULL if there is only one switch chip.
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	 */
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	s8		rtable[DSA_MAX_SWITCHES];
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};
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struct dsa_platform_data {
	/*
	 * Reference to a Linux network interface that connects
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	 * to the root switch chip of the tree.
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	 */
	struct device	*netdev;
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	struct net_device *of_netdev;
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	/*
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	 * Info structs describing each of the switch chips
	 * connected via this network interface.
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	 */
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	int		nr_chips;
	struct dsa_chip_data	*chip;
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};

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struct packet_type;
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struct dsa_switch_tree {
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	struct list_head	list;

	/* Tree identifier */
	u32 tree;

	/* Number of switches attached to this tree */
	struct kref refcount;

	/* Has this tree been applied to the hardware? */
	bool applied;

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	/*
	 * Configuration data for the platform device that owns
	 * this dsa switch tree instance.
	 */
	struct dsa_platform_data	*pd;

	/*
	 * Reference to network device to use, and which tagging
	 * protocol to use.
	 */
	struct net_device	*master_netdev;
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	int			(*rcv)(struct sk_buff *skb,
				       struct net_device *dev,
				       struct packet_type *pt,
				       struct net_device *orig_dev);
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	/*
	 * Original copy of the master netdev ethtool_ops
	 */
	struct ethtool_ops	master_ethtool_ops;
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	const struct ethtool_ops *master_orig_ethtool_ops;
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	/*
	 * The switch and port to which the CPU is attached.
	 */
	s8			cpu_switch;
	s8			cpu_port;

	/*
	 * Data for the individual switch chips.
	 */
	struct dsa_switch	*ds[DSA_MAX_SWITCHES];
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	/*
	 * Tagging protocol operations for adding and removing an
	 * encapsulation tag.
	 */
	const struct dsa_device_ops *tag_ops;
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};

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struct dsa_port {
	struct net_device	*netdev;
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	struct device_node	*dn;
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};

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struct dsa_switch {
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	struct device *dev;

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	/*
	 * Parent switch tree, and switch index.
	 */
	struct dsa_switch_tree	*dst;
	int			index;

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	/*
	 * Give the switch driver somewhere to hang its private data
	 * structure.
	 */
	void *priv;

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	/*
	 * Configuration data for this switch.
	 */
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	struct dsa_chip_data	*cd;
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	/*
	 * The used switch driver.
	 */
	struct dsa_switch_driver	*drv;

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	/*
	 * An array of which element [a] indicates which port on this
	 * switch should be used to send packets to that are destined
	 * for switch a. Can be NULL if there is only one switch chip.
	 */
	s8		rtable[DSA_MAX_SWITCHES];

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#ifdef CONFIG_NET_DSA_HWMON
	/*
	 * Hardware monitoring information
	 */
	char			hwmon_name[IFNAMSIZ + 8];
	struct device		*hwmon_dev;
#endif

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	/*
	 * The lower device this switch uses to talk to the host
	 */
	struct net_device *master_netdev;

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	/*
	 * Slave mii_bus and devices for the individual ports.
	 */
	u32			dsa_port_mask;
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	u32			cpu_port_mask;
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	u32			enabled_port_mask;
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	u32			phys_mii_mask;
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	struct dsa_port		ports[DSA_MAX_PORTS];
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	struct mii_bus		*slave_mii_bus;
};

static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
{
	return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
}

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static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
{
	return !!((ds->dsa_port_mask) & (1 << p));
}

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static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
{
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	return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
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}

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static inline u8 dsa_upstream_port(struct dsa_switch *ds)
{
	struct dsa_switch_tree *dst = ds->dst;

	/*
	 * If this is the root switch (i.e. the switch that connects
	 * to the CPU), return the cpu port number on this switch.
	 * Else return the (DSA) port number that connects to the
	 * switch that is one hop closer to the cpu.
	 */
	if (dst->cpu_switch == ds->index)
		return dst->cpu_port;
	else
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		return ds->rtable[dst->cpu_switch];
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}

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struct switchdev_trans;
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struct switchdev_obj;
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struct switchdev_obj_port_fdb;
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struct switchdev_obj_port_vlan;
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struct dsa_switch_driver {
	struct list_head	list;

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	enum dsa_tag_protocol	tag_protocol;
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	/*
	 * Probing and setup.
	 */
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	const char	*(*probe)(struct device *dsa_dev,
				  struct device *host_dev, int sw_addr,
				  void **priv);
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	int	(*setup)(struct dsa_switch *ds);
	int	(*set_addr)(struct dsa_switch *ds, u8 *addr);
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	u32	(*get_phy_flags)(struct dsa_switch *ds, int port);
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	/*
	 * Access to the switch's PHY registers.
	 */
	int	(*phy_read)(struct dsa_switch *ds, int port, int regnum);
	int	(*phy_write)(struct dsa_switch *ds, int port,
			     int regnum, u16 val);

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	/*
	 * Link state adjustment (called from libphy)
	 */
	void	(*adjust_link)(struct dsa_switch *ds, int port,
				struct phy_device *phydev);
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	void	(*fixed_link_update)(struct dsa_switch *ds, int port,
				struct fixed_phy_status *st);
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	/*
	 * ethtool hardware statistics.
	 */
	void	(*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
	void	(*get_ethtool_stats)(struct dsa_switch *ds,
				     int port, uint64_t *data);
	int	(*get_sset_count)(struct dsa_switch *ds);
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	/*
	 * ethtool Wake-on-LAN
	 */
	void	(*get_wol)(struct dsa_switch *ds, int port,
			   struct ethtool_wolinfo *w);
	int	(*set_wol)(struct dsa_switch *ds, int port,
			   struct ethtool_wolinfo *w);

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	/*
	 * Suspend and resume
	 */
	int	(*suspend)(struct dsa_switch *ds);
	int	(*resume)(struct dsa_switch *ds);
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	/*
	 * Port enable/disable
	 */
	int	(*port_enable)(struct dsa_switch *ds, int port,
			       struct phy_device *phy);
	void	(*port_disable)(struct dsa_switch *ds, int port,
				struct phy_device *phy);
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	/*
	 * EEE setttings
	 */
	int	(*set_eee)(struct dsa_switch *ds, int port,
			   struct phy_device *phydev,
			   struct ethtool_eee *e);
	int	(*get_eee)(struct dsa_switch *ds, int port,
			   struct ethtool_eee *e);
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#ifdef CONFIG_NET_DSA_HWMON
	/* Hardware monitoring */
	int	(*get_temp)(struct dsa_switch *ds, int *temp);
	int	(*get_temp_limit)(struct dsa_switch *ds, int *temp);
	int	(*set_temp_limit)(struct dsa_switch *ds, int temp);
	int	(*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
#endif
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	/* EEPROM access */
	int	(*get_eeprom_len)(struct dsa_switch *ds);
	int	(*get_eeprom)(struct dsa_switch *ds,
			      struct ethtool_eeprom *eeprom, u8 *data);
	int	(*set_eeprom)(struct dsa_switch *ds,
			      struct ethtool_eeprom *eeprom, u8 *data);
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	/*
	 * Register access.
	 */
	int	(*get_regs_len)(struct dsa_switch *ds, int port);
	void	(*get_regs)(struct dsa_switch *ds, int port,
			    struct ethtool_regs *regs, void *p);
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	/*
	 * Bridge integration
	 */
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	int	(*port_bridge_join)(struct dsa_switch *ds, int port,
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				    struct net_device *bridge);
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	void	(*port_bridge_leave)(struct dsa_switch *ds, int port);
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	void	(*port_stp_state_set)(struct dsa_switch *ds, int port,
				      u8 state);
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	/*
	 * VLAN support
	 */
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	int	(*port_vlan_filtering)(struct dsa_switch *ds, int port,
				       bool vlan_filtering);
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	int	(*port_vlan_prepare)(struct dsa_switch *ds, int port,
				     const struct switchdev_obj_port_vlan *vlan,
				     struct switchdev_trans *trans);
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	void	(*port_vlan_add)(struct dsa_switch *ds, int port,
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				 const struct switchdev_obj_port_vlan *vlan,
				 struct switchdev_trans *trans);
	int	(*port_vlan_del)(struct dsa_switch *ds, int port,
				 const struct switchdev_obj_port_vlan *vlan);
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	int	(*port_vlan_dump)(struct dsa_switch *ds, int port,
				  struct switchdev_obj_port_vlan *vlan,
				  int (*cb)(struct switchdev_obj *obj));
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	/*
	 * Forwarding database
	 */
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	int	(*port_fdb_prepare)(struct dsa_switch *ds, int port,
				    const struct switchdev_obj_port_fdb *fdb,
				    struct switchdev_trans *trans);
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	void	(*port_fdb_add)(struct dsa_switch *ds, int port,
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				const struct switchdev_obj_port_fdb *fdb,
				struct switchdev_trans *trans);
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	int	(*port_fdb_del)(struct dsa_switch *ds, int port,
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				const struct switchdev_obj_port_fdb *fdb);
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	int	(*port_fdb_dump)(struct dsa_switch *ds, int port,
				 struct switchdev_obj_port_fdb *fdb,
				 int (*cb)(struct switchdev_obj *obj));
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};

void register_switch_driver(struct dsa_switch_driver *type);
void unregister_switch_driver(struct dsa_switch_driver *type);
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struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
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static inline void *ds_to_priv(struct dsa_switch *ds)
{
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	return ds->priv;
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}

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static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
{
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	return dst->rcv != NULL;
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}
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void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds, struct device_node *np);
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#endif