/*
 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
 * Copyright (c) 2008-2009 Marvell Semiconductor
 *
 * 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

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/ethtool.h>

struct tc_action;
struct phy_device;
struct fixed_phy_status;

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,
        DSA_TAG_PROTO_QCA,
        DSA_TAG_LAST,           /* MUST BE LAST */
};

#define DSA_MAX_SWITCHES        4
#define DSA_MAX_PORTS           12

#define DSA_RTABLE_NONE         -1

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

        /*
         * Reference to network devices
         */
        struct device   *netdev[DSA_MAX_PORTS];

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

        /* 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;

        /*
         * 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];
        struct device_node *port_dn[DSA_MAX_PORTS];

        /*
         * 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];
};

struct dsa_platform_data {
        /*
         * Reference to a Linux network interface that connects
         * to the root switch chip of the tree.
         */
        struct device   *netdev;
        struct net_device *of_netdev;

        /*
         * Info structs describing each of the switch chips
         * connected via this network interface.
         */
        int             nr_chips;
        struct dsa_chip_data    *chip;
};

struct packet_type;

struct dsa_switch_tree {
        struct list_head        list;

        /* Notifier chain for switch-wide events */
        struct raw_notifier_head        nh;

        /* Tree identifier */
        u32 tree;

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

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

        /*
         * 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;
        int                     (*rcv)(struct sk_buff *skb,
                                       struct net_device *dev,
                                       struct packet_type *pt,
                                       struct net_device *orig_dev);

        /*
         * Original copy of the master netdev ethtool_ops
         */
        struct ethtool_ops      master_ethtool_ops;
        const struct ethtool_ops *master_orig_ethtool_ops;

        /*
         * The switch and port to which the CPU is attached.
         */
        struct dsa_switch       *cpu_switch;
        s8                      cpu_port;

        /*
         * Data for the individual switch chips.
         */
        struct dsa_switch       *ds[DSA_MAX_SWITCHES];

        /*
         * Tagging protocol operations for adding and removing an
         * encapsulation tag.
         */
        const struct dsa_device_ops *tag_ops;
};

/* TC matchall action types, only mirroring for now */
enum dsa_port_mall_action_type {
        DSA_PORT_MALL_MIRROR,
};

/* TC mirroring entry */
struct dsa_mall_mirror_tc_entry {
        u8 to_local_port;
        bool ingress;
};

/* TC matchall entry */
struct dsa_mall_tc_entry {
        struct list_head list;
        unsigned long cookie;
        enum dsa_port_mall_action_type type;
        union {
                struct dsa_mall_mirror_tc_entry mirror;
        };
};


struct dsa_port {
        struct dsa_switch       *ds;
        unsigned int            index;
        const char              *name;
        struct net_device       *netdev;
        struct device_node      *dn;
        unsigned int            ageing_time;
        u8                      stp_state;
        struct net_device       *bridge_dev;
};

struct dsa_switch {
        struct device *dev;

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

        /* Listener for switch fabric events */
        struct notifier_block   nb;

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

        /*
         * Configuration data for this switch.
         */
        struct dsa_chip_data    *cd;

        /*
         * The switch operations.
         */
        const struct dsa_switch_ops     *ops;

        /*
         * 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];

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

        /*
         * Slave mii_bus and devices for the individual ports.
         */
        u32                     dsa_port_mask;
        u32                     cpu_port_mask;
        u32                     enabled_port_mask;
        u32                     phys_mii_mask;
        struct mii_bus          *slave_mii_bus;

        /* Dynamically allocated ports, keep last */
        size_t num_ports;
        struct dsa_port ports[];
};

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

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

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

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)
                return dst->cpu_port;
        else
                return ds->rtable[dst->cpu_switch->index];
}

struct switchdev_trans;
struct switchdev_obj;
struct switchdev_obj_port_fdb;
struct switchdev_obj_port_mdb;
struct switchdev_obj_port_vlan;

#define DSA_NOTIFIER_BRIDGE_JOIN                1
#define DSA_NOTIFIER_BRIDGE_LEAVE               2

/* DSA_NOTIFIER_BRIDGE_* */
struct dsa_notifier_bridge_info {
        struct net_device *br;
        int sw_index;
        int port;
};

struct dsa_switch_ops {
        /*
         * Probing and setup.
         */
        const char      *(*probe)(struct device *dsa_dev,
                                  struct device *host_dev, int sw_addr,
                                  void **priv);

        enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds);

        int     (*setup)(struct dsa_switch *ds);
        int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
        u32     (*get_phy_flags)(struct dsa_switch *ds, int port);

        /*
         * 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);

        /*
         * Link state adjustment (called from libphy)
         */
        void    (*adjust_link)(struct dsa_switch *ds, int port,
                                struct phy_device *phydev);
        void    (*fixed_link_update)(struct dsa_switch *ds, int port,
                                struct fixed_phy_status *st);

        /*
         * 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);

        /*
         * 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);

        /*
         * Suspend and resume
         */
        int     (*suspend)(struct dsa_switch *ds);
        int     (*resume)(struct dsa_switch *ds);

        /*
         * 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);

        /*
         * 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);

        /* 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);

        /*
         * 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);

        /*
         * Bridge integration
         */
        int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
        int     (*port_bridge_join)(struct dsa_switch *ds, int port,
                                    struct net_device *bridge);
        void    (*port_bridge_leave)(struct dsa_switch *ds, int port,
                                     struct net_device *bridge);
        void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
                                      u8 state);
        void    (*port_fast_age)(struct dsa_switch *ds, int port);

        /*
         * VLAN support
         */
        int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
                                       bool vlan_filtering);
        int     (*port_vlan_prepare)(struct dsa_switch *ds, int port,
                                     const struct switchdev_obj_port_vlan *vlan,
                                     struct switchdev_trans *trans);
        void    (*port_vlan_add)(struct dsa_switch *ds, int port,
                                 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);
        int     (*port_vlan_dump)(struct dsa_switch *ds, int port,
                                  struct switchdev_obj_port_vlan *vlan,
                                  int (*cb)(struct switchdev_obj *obj));

        /*
         * Forwarding database
         */
        int     (*port_fdb_prepare)(struct dsa_switch *ds, int port,
                                    const struct switchdev_obj_port_fdb *fdb,
                                    struct switchdev_trans *trans);
        void    (*port_fdb_add)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_fdb *fdb,
                                struct switchdev_trans *trans);
        int     (*port_fdb_del)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_fdb *fdb);
        int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
                                 struct switchdev_obj_port_fdb *fdb,
                                 int (*cb)(struct switchdev_obj *obj));

        /*
         * Multicast database
         */
        int     (*port_mdb_prepare)(struct dsa_switch *ds, int port,
                                    const struct switchdev_obj_port_mdb *mdb,
                                    struct switchdev_trans *trans);
        void    (*port_mdb_add)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_mdb *mdb,
                                struct switchdev_trans *trans);
        int     (*port_mdb_del)(struct dsa_switch *ds, int port,
                                const struct switchdev_obj_port_mdb *mdb);
        int     (*port_mdb_dump)(struct dsa_switch *ds, int port,
                                 struct switchdev_obj_port_mdb *mdb,
                                 int (*cb)(struct switchdev_obj *obj));

        /*
         * RXNFC
         */
        int     (*get_rxnfc)(struct dsa_switch *ds, int port,
                             struct ethtool_rxnfc *nfc, u32 *rule_locs);
        int     (*set_rxnfc)(struct dsa_switch *ds, int port,
                             struct ethtool_rxnfc *nfc);

        /*
         * TC integration
         */
        int     (*port_mirror_add)(struct dsa_switch *ds, int port,
                                   struct dsa_mall_mirror_tc_entry *mirror,
                                   bool ingress);
        void    (*port_mirror_del)(struct dsa_switch *ds, int port,
                                   struct dsa_mall_mirror_tc_entry *mirror);
};

struct dsa_switch_driver {
        struct list_head        list;
        const struct dsa_switch_ops *ops;
};

void register_switch_driver(struct dsa_switch_driver *type);
void unregister_switch_driver(struct dsa_switch_driver *type);
struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
struct net_device *dsa_dev_to_net_device(struct device *dev);

static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
{
        return dst->rcv != NULL;
}

struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n);
void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds, struct device *dev);
#ifdef CONFIG_PM_SLEEP
int dsa_switch_suspend(struct dsa_switch *ds);
int dsa_switch_resume(struct dsa_switch *ds);
#else
static inline int dsa_switch_suspend(struct dsa_switch *ds)
{
        return 0;
}
static inline int dsa_switch_resume(struct dsa_switch *ds)
{
        return 0;
}
#endif /* CONFIG_PM_SLEEP */

#endif