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 */ 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 47 struct 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 62 struct 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 95 struct 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 }; 125 126 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 } 146 147 struct 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 }; 180 181 void register_switch_driver(struct dsa_switch_driver *type); 182 void 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 */ 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 202