2 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
3 * Copyright (c) 2008-2009 Marvell Semiconductor
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
11 #ifndef __LINUX_NET_DSA_H
12 #define __LINUX_NET_DSA_H
14 #include <linux/if_ether.h>
15 #include <linux/list.h>
16 #include <linux/timer.h>
17 #include <linux/workqueue.h>
19 #define DSA_MAX_SWITCHES 4
20 #define DSA_MAX_PORTS 12
22 struct dsa_chip_data {
24 * How to access the switch configuration registers.
26 struct device *mii_bus;
30 * The names of the switch's ports. Use "cpu" to
31 * designate the switch port that the cpu is connected to,
32 * "dsa" to indicate that this port is a DSA link to
33 * another switch, NULL to indicate the port is unused,
34 * or any other string to indicate this is a physical port.
36 char *port_names[DSA_MAX_PORTS];
39 * An array (with nr_chips elements) of which element [a]
40 * indicates which port on this switch should be used to
41 * send packets to that are destined for switch a. Can be
42 * NULL if there is only one switch chip.
47 struct dsa_platform_data {
49 * Reference to a Linux network interface that connects
50 * to the root switch chip of the tree.
52 struct device *netdev;
55 * Info structs describing each of the switch chips
56 * connected via this network interface.
59 struct dsa_chip_data *chip;
62 struct dsa_switch_tree {
64 * Configuration data for the platform device that owns
65 * this dsa switch tree instance.
67 struct dsa_platform_data *pd;
70 * Reference to network device to use, and which tagging
73 struct net_device *master_netdev;
77 * The switch and port to which the CPU is attached.
86 struct work_struct link_poll_work;
87 struct timer_list link_poll_timer;
90 * Data for the individual switch chips.
92 struct dsa_switch *ds[DSA_MAX_SWITCHES];
97 * Parent switch tree, and switch index.
99 struct dsa_switch_tree *dst;
103 * Configuration data for this switch.
105 struct dsa_chip_data *pd;
108 * The used switch driver.
110 struct dsa_switch_driver *drv;
113 * Reference to mii bus to use.
115 struct mii_bus *master_mii_bus;
118 * Slave mii_bus and devices for the individual ports.
122 struct mii_bus *slave_mii_bus;
123 struct net_device *ports[DSA_MAX_PORTS];
126 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
128 return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
131 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
133 struct dsa_switch_tree *dst = ds->dst;
136 * If this is the root switch (i.e. the switch that connects
137 * to the CPU), return the cpu port number on this switch.
138 * Else return the (DSA) port number that connects to the
139 * switch that is one hop closer to the cpu.
141 if (dst->cpu_switch == ds->index)
142 return dst->cpu_port;
144 return ds->pd->rtable[dst->cpu_switch];
147 struct dsa_switch_driver {
148 struct list_head list;
156 char *(*probe)(struct mii_bus *bus, int sw_addr);
157 int (*setup)(struct dsa_switch *ds);
158 int (*set_addr)(struct dsa_switch *ds, u8 *addr);
161 * Access to the switch's PHY registers.
163 int (*phy_read)(struct dsa_switch *ds, int port, int regnum);
164 int (*phy_write)(struct dsa_switch *ds, int port,
165 int regnum, u16 val);
168 * Link state polling and IRQ handling.
170 void (*poll_link)(struct dsa_switch *ds);
173 * ethtool hardware statistics.
175 void (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
176 void (*get_ethtool_stats)(struct dsa_switch *ds,
177 int port, uint64_t *data);
178 int (*get_sset_count)(struct dsa_switch *ds);
181 void register_switch_driver(struct dsa_switch_driver *type);
182 void unregister_switch_driver(struct dsa_switch_driver *type);
185 * The original DSA tag format and some other tag formats have no
186 * ethertype, which means that we need to add a little hack to the
187 * networking receive path to make sure that received frames get
188 * the right ->protocol assigned to them when one of those tag
191 static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst)
193 return !!(dst->tag_protocol == htons(ETH_P_DSA));
196 static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst)
198 return !!(dst->tag_protocol == htons(ETH_P_TRAILER));