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dsa.h
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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 #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 
22 struct 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  */
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  */
45 };
46 
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;
60 };
61 
63  /*
64  * Configuration data for the platform device that owns
65  * this dsa switch tree instance.
66  */
68 
69  /*
70  * Reference to network device to use, and which tagging
71  * protocol to use.
72  */
75 
76  /*
77  * The switch and port to which the CPU is attached.
78  */
81 
82  /*
83  * Link state polling.
84  */
88 
89  /*
90  * Data for the individual switch chips.
91  */
93 };
94 
95 struct dsa_switch {
96  /*
97  * Parent switch tree, and switch index.
98  */
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  */
111 
112  /*
113  * Reference to mii bus to use.
114  */
116 
117  /*
118  * Slave mii_bus and devices for the individual ports.
119  */
124 };
125 
126 static 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 
131 static 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 
148  struct list_head list;
149 
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  */
171 
172  /*
173  * ethtool hardware statistics.
174  */
177  int port, uint64_t *data);
179 };
180 
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  */
191 static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst)
192 {
193  return !!(dst->tag_protocol == htons(ETH_P_DSA));
194 }
195 
196 static 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