include/net/dsa.h

   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 #include <linux/of.h>
  19 #include <linux/phy.h>
  20 #include <linux/phy_fixed.h>
  21 #include <linux/ethtool.h>
  22
  23 enum dsa_tag_protocol {
  24         DSA_TAG_PROTO_NONE = 0,
  25         DSA_TAG_PROTO_DSA,
  26         DSA_TAG_PROTO_TRAILER,
  27         DSA_TAG_PROTO_EDSA,
  28         DSA_TAG_PROTO_BRCM,
  29         DSA_TAG_LAST,           /* MUST BE LAST */
  30 };
  31
  32 #define DSA_MAX_SWITCHES        4
  33 #define DSA_MAX_PORTS           12
  34
  35 #define DSA_RTABLE_NONE         -1
  36
  37 struct dsa_chip_data {
  38         /*
  39          * How to access the switch configuration registers.
  40          */
  41         struct device   *host_dev;
  42         int             sw_addr;
  43
  44         /* set to size of eeprom if supported by the switch */
  45         int             eeprom_len;
  46
  47         /* Device tree node pointer for this specific switch chip
  48          * used during switch setup in case additional properties
  49          * and resources needs to be used
  50          */
  51         struct device_node *of_node;
  52
  53         /*
  54          * The names of the switch's ports.  Use "cpu" to
  55          * designate the switch port that the cpu is connected to,
  56          * "dsa" to indicate that this port is a DSA link to
  57          * another switch, NULL to indicate the port is unused,
  58          * or any other string to indicate this is a physical port.
  59          */
  60         char            *port_names[DSA_MAX_PORTS];
  61         struct device_node *port_dn[DSA_MAX_PORTS];
  62
  63         /*
  64          * An array of which element [a] indicates which port on this
  65          * switch should be used to send packets to that are destined
  66          * for switch a. Can be NULL if there is only one switch chip.
  67          */
  68         s8              rtable[DSA_MAX_SWITCHES];
  69 };
  70
  71 struct dsa_platform_data {
  72         /*
  73          * Reference to a Linux network interface that connects
  74          * to the root switch chip of the tree.
  75          */
  76         struct device   *netdev;
  77         struct net_device *of_netdev;
  78
  79         /*
  80          * Info structs describing each of the switch chips
  81          * connected via this network interface.
  82          */
  83         int             nr_chips;
  84         struct dsa_chip_data    *chip;
  85 };
  86
  87 struct packet_type;
  88
  89 struct dsa_switch_tree {
  90         struct list_head        list;
  91
  92         /* Tree identifier */
  93         u32 tree;
  94
  95         /* Number of switches attached to this tree */
  96         struct kref refcount;
  97
  98         /* Has this tree been applied to the hardware? */
  99         bool applied;
 100
 101         /*
 102          * Configuration data for the platform device that owns
 103          * this dsa switch tree instance.
 104          */
 105         struct dsa_platform_data        *pd;
 106
 107         /*
 108          * Reference to network device to use, and which tagging
 109          * protocol to use.
 110          */
 111         struct net_device       *master_netdev;
 112         int                     (*rcv)(struct sk_buff *skb,
 113                                        struct net_device *dev,
 114                                        struct packet_type *pt,
 115                                        struct net_device *orig_dev);
 116
 117         /*
 118          * Original copy of the master netdev ethtool_ops
 119          */
 120         struct ethtool_ops      master_ethtool_ops;
 121         const struct ethtool_ops *master_orig_ethtool_ops;
 122
 123         /*
 124          * The switch and port to which the CPU is attached.
 125          */
 126         s8                      cpu_switch;
 127         s8                      cpu_port;
 128
 129         /*
 130          * Data for the individual switch chips.
 131          */
 132         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 133
 134         /*
 135          * Tagging protocol operations for adding and removing an
 136          * encapsulation tag.
 137          */
 138         const struct dsa_device_ops *tag_ops;
 139 };
 140
 141 struct dsa_port {
 142         struct net_device       *netdev;
 143         struct device_node      *dn;
 144 };
 145
 146 struct dsa_switch {
 147         struct device *dev;
 148
 149         /*
 150          * Parent switch tree, and switch index.
 151          */
 152         struct dsa_switch_tree  *dst;
 153         int                     index;
 154
 155         /*
 156          * Give the switch driver somewhere to hang its private data
 157          * structure.
 158          */
 159         void *priv;
 160
 161         /*
 162          * Configuration data for this switch.
 163          */
 164         struct dsa_chip_data    *cd;
 165
 166         /*
 167          * The used switch driver.
 168          */
 169         struct dsa_switch_driver        *drv;
 170
 171         /*
 172          * An array of which element [a] indicates which port on this
 173          * switch should be used to send packets to that are destined
 174          * for switch a. Can be NULL if there is only one switch chip.
 175          */
 176         s8              rtable[DSA_MAX_SWITCHES];
 177
 178 #ifdef CONFIG_NET_DSA_HWMON
 179         /*
 180          * Hardware monitoring information
 181          */
 182         char                    hwmon_name[IFNAMSIZ + 8];
 183         struct device           *hwmon_dev;
 184 #endif
 185
 186         /*
 187          * The lower device this switch uses to talk to the host
 188          */
 189         struct net_device *master_netdev;
 190
 191         /*
 192          * Slave mii_bus and devices for the individual ports.
 193          */
 194         u32                     dsa_port_mask;
 195         u32                     cpu_port_mask;
 196         u32                     enabled_port_mask;
 197         u32                     phys_mii_mask;
 198         struct dsa_port         ports[DSA_MAX_PORTS];
 199         struct mii_bus          *slave_mii_bus;
 200 };
 201
 202 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 203 {
 204         return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
 205 }
 206
 207 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 208 {
 209         return !!((ds->dsa_port_mask) & (1 << p));
 210 }
 211
 212 static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
 213 {
 214         return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
 215 }
 216
 217 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 218 {
 219         struct dsa_switch_tree *dst = ds->dst;
 220
 221         /*
 222          * If this is the root switch (i.e. the switch that connects
 223          * to the CPU), return the cpu port number on this switch.
 224          * Else return the (DSA) port number that connects to the
 225          * switch that is one hop closer to the cpu.
 226          */
 227         if (dst->cpu_switch == ds->index)
 228                 return dst->cpu_port;
 229         else
 230                 return ds->rtable[dst->cpu_switch];
 231 }
 232
 233 struct switchdev_trans;
 234 struct switchdev_obj;
 235 struct switchdev_obj_port_fdb;
 236 struct switchdev_obj_port_vlan;
 237
 238 struct dsa_switch_driver {
 239         struct list_head        list;
 240
 241         enum dsa_tag_protocol   tag_protocol;
 242
 243         /*
 244          * Probing and setup.
 245          */
 246         const char      *(*probe)(struct device *dsa_dev,
 247                                   struct device *host_dev, int sw_addr,
 248                                   void **priv);
 249         int     (*setup)(struct dsa_switch *ds);
 250         int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
 251         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 252
 253         /*
 254          * Access to the switch's PHY registers.
 255          */
 256         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 257         int     (*phy_write)(struct dsa_switch *ds, int port,
 258                              int regnum, u16 val);
 259
 260         /*
 261          * Link state adjustment (called from libphy)
 262          */
 263         void    (*adjust_link)(struct dsa_switch *ds, int port,
 264                                 struct phy_device *phydev);
 265         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 266                                 struct fixed_phy_status *st);
 267
 268         /*
 269          * ethtool hardware statistics.
 270          */
 271         void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
 272         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 273                                      int port, uint64_t *data);
 274         int     (*get_sset_count)(struct dsa_switch *ds);
 275
 276         /*
 277          * ethtool Wake-on-LAN
 278          */
 279         void    (*get_wol)(struct dsa_switch *ds, int port,
 280                            struct ethtool_wolinfo *w);
 281         int     (*set_wol)(struct dsa_switch *ds, int port,
 282                            struct ethtool_wolinfo *w);
 283
 284         /*
 285          * Suspend and resume
 286          */
 287         int     (*suspend)(struct dsa_switch *ds);
 288         int     (*resume)(struct dsa_switch *ds);
 289
 290         /*
 291          * Port enable/disable
 292          */
 293         int     (*port_enable)(struct dsa_switch *ds, int port,
 294                                struct phy_device *phy);
 295         void    (*port_disable)(struct dsa_switch *ds, int port,
 296                                 struct phy_device *phy);
 297
 298         /*
 299          * EEE setttings
 300          */
 301         int     (*set_eee)(struct dsa_switch *ds, int port,
 302                            struct phy_device *phydev,
 303                            struct ethtool_eee *e);
 304         int     (*get_eee)(struct dsa_switch *ds, int port,
 305                            struct ethtool_eee *e);
 306
 307 #ifdef CONFIG_NET_DSA_HWMON
 308         /* Hardware monitoring */
 309         int     (*get_temp)(struct dsa_switch *ds, int *temp);
 310         int     (*get_temp_limit)(struct dsa_switch *ds, int *temp);
 311         int     (*set_temp_limit)(struct dsa_switch *ds, int temp);
 312         int     (*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
 313 #endif
 314
 315         /* EEPROM access */
 316         int     (*get_eeprom_len)(struct dsa_switch *ds);
 317         int     (*get_eeprom)(struct dsa_switch *ds,
 318                               struct ethtool_eeprom *eeprom, u8 *data);
 319         int     (*set_eeprom)(struct dsa_switch *ds,
 320                               struct ethtool_eeprom *eeprom, u8 *data);
 321
 322         /*
 323          * Register access.
 324          */
 325         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 326         void    (*get_regs)(struct dsa_switch *ds, int port,
 327                             struct ethtool_regs *regs, void *p);
 328
 329         /*
 330          * Bridge integration
 331          */
 332         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 333                                     struct net_device *bridge);
 334         void    (*port_bridge_leave)(struct dsa_switch *ds, int port);
 335         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 336                                       u8 state);
 337
 338         /*
 339          * VLAN support
 340          */
 341         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 342                                        bool vlan_filtering);
 343         int     (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 344                                      const struct switchdev_obj_port_vlan *vlan,
 345                                      struct switchdev_trans *trans);
 346         void    (*port_vlan_add)(struct dsa_switch *ds, int port,
 347                                  const struct switchdev_obj_port_vlan *vlan,
 348                                  struct switchdev_trans *trans);
 349         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 350                                  const struct switchdev_obj_port_vlan *vlan);
 351         int     (*port_vlan_dump)(struct dsa_switch *ds, int port,
 352                                   struct switchdev_obj_port_vlan *vlan,
 353                                   int (*cb)(struct switchdev_obj *obj));
 354
 355         /*
 356          * Forwarding database
 357          */
 358         int     (*port_fdb_prepare)(struct dsa_switch *ds, int port,
 359                                     const struct switchdev_obj_port_fdb *fdb,
 360                                     struct switchdev_trans *trans);
 361         void    (*port_fdb_add)(struct dsa_switch *ds, int port,
 362                                 const struct switchdev_obj_port_fdb *fdb,
 363                                 struct switchdev_trans *trans);
 364         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 365                                 const struct switchdev_obj_port_fdb *fdb);
 366         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 367                                  struct switchdev_obj_port_fdb *fdb,
 368                                  int (*cb)(struct switchdev_obj *obj));
 369 };
 370
 371 void register_switch_driver(struct dsa_switch_driver *type);
 372 void unregister_switch_driver(struct dsa_switch_driver *type);
 373 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 374
 375 static inline void *ds_to_priv(struct dsa_switch *ds)
 376 {
 377         return ds->priv;
 378 }
 379
 380 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
 381 {
 382         return dst->rcv != NULL;
 383 }
 384
 385 void dsa_unregister_switch(struct dsa_switch *ds);
 386 int dsa_register_switch(struct dsa_switch *ds, struct device_node *np);
 387 #endif