/* SPDX-License-Identifier: GPL-2.0-or-later */

  /*
   * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips

   * Copyright (c) 2008-2009 Marvell Semiconductor

   */
  
  #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>

  #include <linux/net_tstamp.h>

  #include <linux/phy.h>

  #include <linux/platform_data/dsa.h>

  #include <linux/phylink.h>

  #include <net/devlink.h>

  #include <net/switchdev.h>

  struct tc_action;

  struct phy_device;
  struct fixed_phy_status;

  struct phylink_link_state;

  #define DSA_TAG_PROTO_NONE_VALUE		0
  #define DSA_TAG_PROTO_BRCM_VALUE		1
  #define DSA_TAG_PROTO_BRCM_PREPEND_VALUE	2
  #define DSA_TAG_PROTO_DSA_VALUE			3
  #define DSA_TAG_PROTO_EDSA_VALUE		4
  #define DSA_TAG_PROTO_GSWIP_VALUE		5
  #define DSA_TAG_PROTO_KSZ9477_VALUE		6
  #define DSA_TAG_PROTO_KSZ9893_VALUE		7
  #define DSA_TAG_PROTO_LAN9303_VALUE		8
  #define DSA_TAG_PROTO_MTK_VALUE			9
  #define DSA_TAG_PROTO_QCA_VALUE			10
  #define DSA_TAG_PROTO_TRAILER_VALUE		11

  #define DSA_TAG_PROTO_8021Q_VALUE		12

  #define DSA_TAG_PROTO_SJA1105_VALUE		13

  #define DSA_TAG_PROTO_KSZ8795_VALUE		14

  #define DSA_TAG_PROTO_OCELOT_VALUE		15

  enum dsa_tag_protocol {

  	DSA_TAG_PROTO_NONE		= DSA_TAG_PROTO_NONE_VALUE,
  	DSA_TAG_PROTO_BRCM		= DSA_TAG_PROTO_BRCM_VALUE,
  	DSA_TAG_PROTO_BRCM_PREPEND	= DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
  	DSA_TAG_PROTO_DSA		= DSA_TAG_PROTO_DSA_VALUE,
  	DSA_TAG_PROTO_EDSA		= DSA_TAG_PROTO_EDSA_VALUE,
  	DSA_TAG_PROTO_GSWIP		= DSA_TAG_PROTO_GSWIP_VALUE,
  	DSA_TAG_PROTO_KSZ9477		= DSA_TAG_PROTO_KSZ9477_VALUE,
  	DSA_TAG_PROTO_KSZ9893		= DSA_TAG_PROTO_KSZ9893_VALUE,
  	DSA_TAG_PROTO_LAN9303		= DSA_TAG_PROTO_LAN9303_VALUE,
  	DSA_TAG_PROTO_MTK		= DSA_TAG_PROTO_MTK_VALUE,
  	DSA_TAG_PROTO_QCA		= DSA_TAG_PROTO_QCA_VALUE,
  	DSA_TAG_PROTO_TRAILER		= DSA_TAG_PROTO_TRAILER_VALUE,

  	DSA_TAG_PROTO_8021Q		= DSA_TAG_PROTO_8021Q_VALUE,

  	DSA_TAG_PROTO_SJA1105		= DSA_TAG_PROTO_SJA1105_VALUE,

  	DSA_TAG_PROTO_KSZ8795		= DSA_TAG_PROTO_KSZ8795_VALUE,

  	DSA_TAG_PROTO_OCELOT		= DSA_TAG_PROTO_OCELOT_VALUE,

  };

  struct packet_type;

  struct dsa_switch;

  struct dsa_device_ops {
  	struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
  	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,

  			       struct packet_type *pt);

  	int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
  			    int *offset);

  	/* Used to determine which traffic should match the DSA filter in
  	 * eth_type_trans, and which, if any, should bypass it and be processed
  	 * as regular on the master net device.
  	 */
  	bool (*filter)(const struct sk_buff *skb, struct net_device *dev);

  	unsigned int overhead;

  	const char *name;

  	enum dsa_tag_protocol proto;

  };

  #define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
  #define MODULE_ALIAS_DSA_TAG_DRIVER(__proto)				\
  	MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __stringify(__proto##_VALUE))

  struct dsa_skb_cb {
  	struct sk_buff *clone;

  	bool deferred_xmit;

  };
  
  struct __dsa_skb_cb {
  	struct dsa_skb_cb cb;
  	u8 priv[48 - sizeof(struct dsa_skb_cb)];
  };
  
  #define __DSA_SKB_CB(skb) ((struct __dsa_skb_cb *)((skb)->cb))
  
  #define DSA_SKB_CB(skb) ((struct dsa_skb_cb *)((skb)->cb))

  #define DSA_SKB_CB_PRIV(skb)			\
  	((void *)(skb)->cb + offsetof(struct __dsa_skb_cb, priv))

  struct dsa_switch_tree {

  	struct list_head	list;

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

  	/* Tree identifier */

  	unsigned int index;

  
  	/* Number of switches attached to this tree */
  	struct kref refcount;
  
  	/* Has this tree been applied to the hardware? */

  	bool setup;

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

  	/*

  	 * The switch port to which the CPU is attached.

  	 */

  	struct dsa_port		*cpu_dp;

  
  	/*

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

  /* 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 {

  	/* A CPU port is physically connected to a master device.
  	 * A user port exposed to userspace has a slave device.
  	 */
  	union {
  		struct net_device *master;
  		struct net_device *slave;
  	};

  	/* CPU port tagging operations used by master or slave devices */
  	const struct dsa_device_ops *tag_ops;

  	/* Copies for faster access in master receive hot path */
  	struct dsa_switch_tree *dst;
  	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
  			       struct packet_type *pt);

  	bool (*filter)(const struct sk_buff *skb, struct net_device *dev);

  	enum {
  		DSA_PORT_TYPE_UNUSED = 0,
  		DSA_PORT_TYPE_CPU,
  		DSA_PORT_TYPE_DSA,
  		DSA_PORT_TYPE_USER,
  	} type;

  	struct dsa_switch	*ds;
  	unsigned int		index;

  	const char		*name;

  	struct dsa_port		*cpu_dp;

  	const char		*mac;

  	struct device_node	*dn;

  	unsigned int		ageing_time;

  	bool			vlan_filtering;

  	u8			stp_state;

  	struct net_device	*bridge_dev;

  	struct devlink_port	devlink_port;

  	struct phylink		*pl;

  	struct phylink_config	pl_config;

  
  	struct work_struct	xmit_work;
  	struct sk_buff_head	xmit_queue;

  	/*

  	 * Give the switch driver somewhere to hang its per-port private data
  	 * structures (accessible from the tagger).
  	 */
  	void *priv;
  
  	/*

  	 * Original copy of the master netdev ethtool_ops
  	 */

  	const struct ethtool_ops *orig_ethtool_ops;

  
  	/*
  	 * Original copy of the master netdev net_device_ops
  	 */
  	const struct net_device_ops *orig_ndo_ops;

  };

  struct dsa_switch {

  	struct device *dev;

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

  	unsigned 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];

  	/*
  	 * Slave mii_bus and devices for the individual ports.
  	 */

  	u32			phys_mii_mask;

  	struct mii_bus		*slave_mii_bus;

  	/* Ageing Time limits in msecs */
  	unsigned int ageing_time_min;
  	unsigned int ageing_time_max;

  	/* devlink used to represent this switch device */
  	struct devlink		*devlink;

  	/* Number of switch port queues */
  	unsigned int		num_tx_queues;

  	/* Disallow bridge core from requesting different VLAN awareness
  	 * settings on ports if not hardware-supported
  	 */
  	bool			vlan_filtering_is_global;

  	/* In case vlan_filtering_is_global is set, the VLAN awareness state
  	 * should be retrieved from here and not from the per-port settings.
  	 */
  	bool			vlan_filtering;

  	/* MAC PCS does not provide link state change interrupt, and requires
  	 * polling. Flag passed on to PHYLINK.
  	 */
  	bool			pcs_poll;

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

  };

  static inline const struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)

  {

  	return &ds->ports[p];
  }

  static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
  {
  	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;

  }

  static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
  {

  	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;

  }

  static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
  {

  	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;

  }

  static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)

  {

  	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;

  }

  static inline u32 dsa_user_ports(struct dsa_switch *ds)
  {

  	u32 mask = 0;
  	int p;

  	for (p = 0; p < ds->num_ports; p++)
  		if (dsa_is_user_port(ds, p))
  			mask |= BIT(p);
  
  	return mask;

  }

  /* Return the local port used to reach an arbitrary switch port */
  static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
  					    int port)
  {
  	if (device == ds->index)
  		return port;
  	else
  		return ds->rtable[device];
  }
  
  /* Return the local port used to reach the dedicated CPU port */

  static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)

  {

  	const struct dsa_port *dp = dsa_to_port(ds, port);
  	const struct dsa_port *cpu_dp = dp->cpu_dp;
  
  	if (!cpu_dp)
  		return port;

  	return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);

  }

  static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
  {
  	const struct dsa_switch *ds = dp->ds;
  
  	if (ds->vlan_filtering_is_global)
  		return ds->vlan_filtering;
  	else
  		return dp->vlan_filtering;
  }

  typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
  			      bool is_static, void *data);

  struct dsa_switch_ops {

  	enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
  						  int port);

  	int	(*setup)(struct dsa_switch *ds);

  	void	(*teardown)(struct dsa_switch *ds);

  	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);

  
  	/*

  	 * PHYLINK integration
  	 */
  	void	(*phylink_validate)(struct dsa_switch *ds, int port,
  				    unsigned long *supported,
  				    struct phylink_link_state *state);
  	int	(*phylink_mac_link_state)(struct dsa_switch *ds, int port,
  					  struct phylink_link_state *state);
  	void	(*phylink_mac_config)(struct dsa_switch *ds, int port,
  				      unsigned int mode,
  				      const struct phylink_link_state *state);
  	void	(*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
  	void	(*phylink_mac_link_down)(struct dsa_switch *ds, int port,
  					 unsigned int mode,
  					 phy_interface_t interface);
  	void	(*phylink_mac_link_up)(struct dsa_switch *ds, int port,
  				       unsigned int mode,
  				       phy_interface_t interface,
  				       struct phy_device *phydev);
  	void	(*phylink_fixed_state)(struct dsa_switch *ds, int port,
  				       struct phylink_link_state *state);
  	/*

  	 * ethtool hardware statistics.
  	 */

  	void	(*get_strings)(struct dsa_switch *ds, int port,
  			       u32 stringset, uint8_t *data);

  	void	(*get_ethtool_stats)(struct dsa_switch *ds,
  				     int port, uint64_t *data);

  	int	(*get_sset_count)(struct dsa_switch *ds, int port, int sset);

  	void	(*get_ethtool_phy_stats)(struct dsa_switch *ds,
  					 int port, uint64_t *data);

  
  	/*

  	 * 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);
  
  	/*

  	 * ethtool timestamp info
  	 */
  	int	(*get_ts_info)(struct dsa_switch *ds, int port,
  			       struct ethtool_ts_info *ts);
  
  	/*

  	 * 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);

  
  	/*

  	 * Port's MAC EEE settings

  	 */

  	int	(*set_mac_eee)(struct dsa_switch *ds, int port,
  			       struct ethtool_eee *e);
  	int	(*get_mac_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);

  	int	(*port_egress_floods)(struct dsa_switch *ds, int port,
  				      bool unicast, bool multicast);

  
  	/*

  	 * 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);
  	void (*port_vlan_add)(struct dsa_switch *ds, int port,
  			      const struct switchdev_obj_port_vlan *vlan);

  	int	(*port_vlan_del)(struct dsa_switch *ds, int port,
  				 const struct switchdev_obj_port_vlan *vlan);

  	/*

  	 * Forwarding database
  	 */

  	int	(*port_fdb_add)(struct dsa_switch *ds, int port,

  				const unsigned char *addr, u16 vid);

  	int	(*port_fdb_del)(struct dsa_switch *ds, int port,

  				const unsigned char *addr, u16 vid);

  	int	(*port_fdb_dump)(struct dsa_switch *ds, int port,

  				 dsa_fdb_dump_cb_t *cb, void *data);

  
  	/*
  	 * Multicast database
  	 */

  	int (*port_mdb_prepare)(struct dsa_switch *ds, int port,
  				const struct switchdev_obj_port_mdb *mdb);
  	void (*port_mdb_add)(struct dsa_switch *ds, int port,
  			     const struct switchdev_obj_port_mdb *mdb);

  	int	(*port_mdb_del)(struct dsa_switch *ds, int port,
  				const struct switchdev_obj_port_mdb *mdb);

  	/*
  	 * 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);

  	int	(*port_setup_tc)(struct dsa_switch *ds, int port,
  				 enum tc_setup_type type, void *type_data);

  
  	/*
  	 * Cross-chip operations
  	 */
  	int	(*crosschip_bridge_join)(struct dsa_switch *ds, int sw_index,
  					 int port, struct net_device *br);
  	void	(*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
  					  int port, struct net_device *br);

  
  	/*
  	 * PTP functionality
  	 */
  	int	(*port_hwtstamp_get)(struct dsa_switch *ds, int port,
  				     struct ifreq *ifr);
  	int	(*port_hwtstamp_set)(struct dsa_switch *ds, int port,
  				     struct ifreq *ifr);

  	bool	(*port_txtstamp)(struct dsa_switch *ds, int port,
  				 struct sk_buff *clone, unsigned int type);
  	bool	(*port_rxtstamp)(struct dsa_switch *ds, int port,
  				 struct sk_buff *skb, unsigned int type);

  
  	/*
  	 * Deferred frame Tx
  	 */
  	netdev_tx_t (*port_deferred_xmit)(struct dsa_switch *ds, int port,
  					  struct sk_buff *skb);

  	int	(*port_tsn_enable)(struct dsa_port *dp);

  };

  struct dsa_switch_driver {
  	struct list_head	list;

  	const struct dsa_switch_ops *ops;

  };

  struct net_device *dsa_dev_to_net_device(struct device *dev);

  /* Keep inline for faster access in hot path */

  static inline bool netdev_uses_dsa(struct net_device *dev)
  {
  #if IS_ENABLED(CONFIG_NET_DSA)

  	return dev->dsa_ptr && dev->dsa_ptr->rcv;

  #endif
  	return false;
  }

  static inline bool dsa_can_decode(const struct sk_buff *skb,
  				  struct net_device *dev)
  {
  #if IS_ENABLED(CONFIG_NET_DSA)
  	return !dev->dsa_ptr->filter || dev->dsa_ptr->filter(skb, dev);
  #endif
  	return false;
  }

  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);

  #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 */

  enum dsa_notifier_type {
  	DSA_PORT_REGISTER,
  	DSA_PORT_UNREGISTER,
  };
  
  struct dsa_notifier_info {
  	struct net_device *dev;
  };
  
  struct dsa_notifier_register_info {
  	struct dsa_notifier_info info;	/* must be first */
  	struct net_device *master;
  	unsigned int port_number;
  	unsigned int switch_number;
  };
  
  static inline struct net_device *
  dsa_notifier_info_to_dev(const struct dsa_notifier_info *info)
  {
  	return info->dev;
  }
  
  #if IS_ENABLED(CONFIG_NET_DSA)
  int register_dsa_notifier(struct notifier_block *nb);
  int unregister_dsa_notifier(struct notifier_block *nb);
  int call_dsa_notifiers(unsigned long val, struct net_device *dev,
  		       struct dsa_notifier_info *info);
  #else
  static inline int register_dsa_notifier(struct notifier_block *nb)
  {
  	return 0;
  }
  
  static inline int unregister_dsa_notifier(struct notifier_block *nb)
  {
  	return 0;
  }
  
  static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
  				     struct dsa_notifier_info *info)
  {
  	return NOTIFY_DONE;
  }
  #endif

  /* Broadcom tag specific helpers to insert and extract queue/port number */
  #define BRCM_TAG_SET_PORT_QUEUE(p, q)	((p) << 8 | q)
  #define BRCM_TAG_GET_PORT(v)		((v) >> 8)
  #define BRCM_TAG_GET_QUEUE(v)		((v) & 0xff)

  netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);

  int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
  int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
  int dsa_port_get_phy_sset_count(struct dsa_port *dp);

  void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);

  struct dsa_tag_driver {
  	const struct dsa_device_ops *ops;
  	struct list_head list;
  	struct module *owner;
  };
  
  void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
  			      unsigned int count,
  			      struct module *owner);
  void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
  				unsigned int count);
  
  #define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count)	\
  static int __init dsa_tag_driver_module_init(void)			\
  {									\
  	dsa_tag_drivers_register(__dsa_tag_drivers_array, __count,	\
  				 THIS_MODULE);				\
  	return 0;							\
  }									\
  module_init(dsa_tag_driver_module_init);				\
  									\
  static void __exit dsa_tag_driver_module_exit(void)			\
  {									\
  	dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count);	\
  }									\
  module_exit(dsa_tag_driver_module_exit)
  
  /**
   * module_dsa_tag_drivers() - Helper macro for registering DSA tag
   * drivers
   * @__ops_array: Array of tag driver strucutres
   *
   * Helper macro for DSA tag drivers which do not do anything special
   * in module init/exit. Each module may only use this macro once, and
   * calling it replaces module_init() and module_exit().
   */
  #define module_dsa_tag_drivers(__ops_array)				\
  dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
  
  #define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
  
  /* Create a static structure we can build a linked list of dsa_tag
   * drivers
   */
  #define DSA_TAG_DRIVER(__ops)						\
  static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = {		\
  	.ops = &__ops,							\
  }
  
  /**
   * module_dsa_tag_driver() - Helper macro for registering a single DSA tag
   * driver
   * @__ops: Single tag driver structures
   *
   * Helper macro for DSA tag drivers which do not do anything special
   * in module init/exit. Each module may only use this macro once, and
   * calling it replaces module_init() and module_exit().
   */
  #define module_dsa_tag_driver(__ops)					\
  DSA_TAG_DRIVER(__ops);							\
  									\
  static struct dsa_tag_driver *dsa_tag_driver_array[] =	{		\
  	&DSA_TAG_DRIVER_NAME(__ops)					\
  };									\
  module_dsa_tag_drivers(dsa_tag_driver_array)

  #endif