/* * 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_ether.h>#include <linux/list.h>#include <linux/timer.h>#include <linux/workqueue.h> #define DSA_MAX_SWITCHES	4#define DSA_MAX_PORTS		12 struct dsa_chip_data {	/*	 * How to access the switch configuration registers.	 */	struct device	*mii_bus;	int		sw_addr; 	/*	 * 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]; 	/*	 * An array (with nr_chips elements) 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;}; struct dsa_platform_data {	/*	 * Reference to a Linux network interface that connects	 * to the root switch chip of the tree.	 */	struct device	*netdev; 	/*	 * Info structs describing each of the switch chips	 * connected via this network interface.	 */	int		nr_chips;	struct dsa_chip_data	*chip;}; struct dsa_switch_tree {	/*	 * 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;	__be16			tag_protocol; 	/*	 * The switch and port to which the CPU is attached.	 */	s8			cpu_switch;	s8			cpu_port; 	/*	 * Link state polling.	 */	int			link_poll_needed;	struct work_struct	link_poll_work;	struct timer_list	link_poll_timer; 	/*	 * Data for the individual switch chips.	 */	struct dsa_switch	*ds[DSA_MAX_SWITCHES];}; struct dsa_switch {	/*	 * Parent switch tree, and switch index.	 */	struct dsa_switch_tree	*dst;	int			index; 	/*	 * Configuration data for this switch.	 */	struct dsa_chip_data	*pd; 	/*	 * The used switch driver.	 */	struct dsa_switch_driver	*drv; 	/*	 * Reference to mii bus to use.	 */	struct mii_bus		*master_mii_bus; 	/*	 * Slave mii_bus and devices for the individual ports.	 */	u32			dsa_port_mask;	u32			phys_port_mask;	struct mii_bus		*slave_mii_bus;	struct net_device	*ports[DSA_MAX_PORTS];}; 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);} 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		return ds->pd->rtable[dst->cpu_switch];} struct dsa_switch_driver {	struct list_head	list; 	__be16			tag_protocol;	int			priv_size; 	/*	 * Probing and setup.	 */	char	*(*probe)(struct mii_bus *bus, int sw_addr);	int	(*setup)(struct dsa_switch *ds);	int	(*set_addr)(struct dsa_switch *ds, u8 *addr); 	/*	 * 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 polling and IRQ handling.	 */	void	(*poll_link)(struct dsa_switch *ds); 	/*	 * 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);}; void register_switch_driver(struct dsa_switch_driver *type);void unregister_switch_driver(struct dsa_switch_driver *type); /* * The original DSA tag format and some other tag formats have no * ethertype, which means that we need to add a little hack to the * networking receive path to make sure that received frames get * the right ->protocol assigned to them when one of those tag * formats is in use. */static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst){	return !!(dst->tag_protocol == htons(ETH_P_DSA));} static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst){	return !!(dst->tag_protocol == htons(ETH_P_TRAILER));} #endif