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/*
* 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);
static inline void *ds_to_priv(struct dsa_switch *ds)
{
return (void *)(ds + 1);
}
/*
* 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
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