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1/*
2 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
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.
9 */
10
11#ifndef __LINUX_NET_DSA_H
12#define __LINUX_NET_DSA_H
13
14#define DSA_MAX_SWITCHES 4
15#define DSA_MAX_PORTS 12
16
17struct dsa_chip_data {
18 /*
19 * How to access the switch configuration registers.
20 */
21 struct device *mii_bus;
22 int sw_addr;
23
24 /*
25 * The names of the switch's ports. Use "cpu" to
26 * designate the switch port that the cpu is connected to,
27 * "dsa" to indicate that this port is a DSA link to
28 * another switch, NULL to indicate the port is unused,
29 * or any other string to indicate this is a physical port.
30 */
31 char *port_names[DSA_MAX_PORTS];
32
33 /*
34 * An array (with nr_chips elements) of which element [a]
35 * indicates which port on this switch should be used to
36 * send packets to that are destined for switch a. Can be
37 * NULL if there is only one switch chip.
38 */
39 s8 *rtable;
40};
41
42struct dsa_platform_data {
43 /*
44 * Reference to a Linux network interface that connects
45 * to the root switch chip of the tree.
46 */
47 struct device *netdev;
48
49 /*
50 * Info structs describing each of the switch chips
51 * connected via this network interface.
52 */
53 int nr_chips;
54 struct dsa_chip_data *chip;
55};
56
57extern bool dsa_uses_dsa_tags(void *dsa_ptr);
58extern bool dsa_uses_trailer_tags(void *dsa_ptr);
59
60
61#endif
1/*
2 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
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.
9 */
10
11#ifndef __LINUX_NET_DSA_H
12#define __LINUX_NET_DSA_H
13
14#include <linux/if_ether.h>
15#include <linux/list.h>
16#include <linux/timer.h>
17#include <linux/workqueue.h>
18
19#define DSA_MAX_SWITCHES 4
20#define DSA_MAX_PORTS 12
21
22struct dsa_chip_data {
23 /*
24 * How to access the switch configuration registers.
25 */
26 struct device *mii_bus;
27 int sw_addr;
28
29 /*
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.
35 */
36 char *port_names[DSA_MAX_PORTS];
37
38 /*
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.
43 */
44 s8 *rtable;
45};
46
47struct dsa_platform_data {
48 /*
49 * Reference to a Linux network interface that connects
50 * to the root switch chip of the tree.
51 */
52 struct device *netdev;
53
54 /*
55 * Info structs describing each of the switch chips
56 * connected via this network interface.
57 */
58 int nr_chips;
59 struct dsa_chip_data *chip;
60};
61
62struct dsa_switch_tree {
63 /*
64 * Configuration data for the platform device that owns
65 * this dsa switch tree instance.
66 */
67 struct dsa_platform_data *pd;
68
69 /*
70 * Reference to network device to use, and which tagging
71 * protocol to use.
72 */
73 struct net_device *master_netdev;
74 __be16 tag_protocol;
75
76 /*
77 * The switch and port to which the CPU is attached.
78 */
79 s8 cpu_switch;
80 s8 cpu_port;
81
82 /*
83 * Link state polling.
84 */
85 int link_poll_needed;
86 struct work_struct link_poll_work;
87 struct timer_list link_poll_timer;
88
89 /*
90 * Data for the individual switch chips.
91 */
92 struct dsa_switch *ds[DSA_MAX_SWITCHES];
93};
94
95struct dsa_switch {
96 /*
97 * Parent switch tree, and switch index.
98 */
99 struct dsa_switch_tree *dst;
100 int index;
101
102 /*
103 * Configuration data for this switch.
104 */
105 struct dsa_chip_data *pd;
106
107 /*
108 * The used switch driver.
109 */
110 struct dsa_switch_driver *drv;
111
112 /*
113 * Reference to mii bus to use.
114 */
115 struct mii_bus *master_mii_bus;
116
117 /*
118 * Slave mii_bus and devices for the individual ports.
119 */
120 u32 dsa_port_mask;
121 u32 phys_port_mask;
122 struct mii_bus *slave_mii_bus;
123 struct net_device *ports[DSA_MAX_PORTS];
124};
125
126static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
127{
128 return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
129}
130
131static inline u8 dsa_upstream_port(struct dsa_switch *ds)
132{
133 struct dsa_switch_tree *dst = ds->dst;
134
135 /*
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.
140 */
141 if (dst->cpu_switch == ds->index)
142 return dst->cpu_port;
143 else
144 return ds->pd->rtable[dst->cpu_switch];
145}
146
147struct dsa_switch_driver {
148 struct list_head list;
149
150 __be16 tag_protocol;
151 int priv_size;
152
153 /*
154 * Probing and setup.
155 */
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);
159
160 /*
161 * Access to the switch's PHY registers.
162 */
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);
166
167 /*
168 * Link state polling and IRQ handling.
169 */
170 void (*poll_link)(struct dsa_switch *ds);
171
172 /*
173 * ethtool hardware statistics.
174 */
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);
179};
180
181void register_switch_driver(struct dsa_switch_driver *type);
182void unregister_switch_driver(struct dsa_switch_driver *type);
183
184/*
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
189 * formats is in use.
190 */
191static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst)
192{
193 return !!(dst->tag_protocol == htons(ETH_P_DSA));
194}
195
196static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst)
197{
198 return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
199}
200
201#endif