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_PROTO_QCA,
  30         DSA_TAG_LAST,           /* MUST BE LAST */
  31 };
  32
  33 #define DSA_MAX_SWITCHES        4
  34 #define DSA_MAX_PORTS           12
  35
  36 #define DSA_RTABLE_NONE         -1
  37
  38 struct dsa_chip_data {
  39         /*
  40          * How to access the switch configuration registers.
  41          */
  42         struct device   *host_dev;
  43         int             sw_addr;
  44
  45         /* set to size of eeprom if supported by the switch */
  46         int             eeprom_len;
  47
  48         /* Device tree node pointer for this specific switch chip
  49          * used during switch setup in case additional properties
  50          * and resources needs to be used
  51          */
  52         struct device_node *of_node;
  53
  54         /*
  55          * The names of the switch's ports.  Use "cpu" to
  56          * designate the switch port that the cpu is connected to,
  57          * "dsa" to indicate that this port is a DSA link to
  58          * another switch, NULL to indicate the port is unused,
  59          * or any other string to indicate this is a physical port.
  60          */
  61         char            *port_names[DSA_MAX_PORTS];
  62         struct device_node *port_dn[DSA_MAX_PORTS];
  63
  64         /*
  65          * An array of which element [a] indicates which port on this
  66          * switch should be used to send packets to that are destined
  67          * for switch a. Can be NULL if there is only one switch chip.
  68          */
  69         s8              rtable[DSA_MAX_SWITCHES];
  70 };
  71
  72 struct dsa_platform_data {
  73         /*
  74          * Reference to a Linux network interface that connects
  75          * to the root switch chip of the tree.
  76          */
  77         struct device   *netdev;
  78         struct net_device *of_netdev;
  79
  80         /*
  81          * Info structs describing each of the switch chips
  82          * connected via this network interface.
  83          */
  84         int             nr_chips;
  85         struct dsa_chip_data    *chip;
  86 };
  87
  88 struct packet_type;
  89
  90 struct dsa_switch_tree {
  91         struct list_head        list;
  92
  93         /* Tree identifier */
  94         u32 tree;
  95
  96         /* Number of switches attached to this tree */
  97         struct kref refcount;
  98
  99         /* Has this tree been applied to the hardware? */
 100         bool applied;
 101
 102         /*
 103          * Configuration data for the platform device that owns
 104          * this dsa switch tree instance.
 105          */
 106         struct dsa_platform_data        *pd;
 107
 108         /*
 109          * Reference to network device to use, and which tagging
 110          * protocol to use.
 111          */
 112         struct net_device       *master_netdev;
 113         int                     (*rcv)(struct sk_buff *skb,
 114                                        struct net_device *dev,
 115                                        struct packet_type *pt,
 116                                        struct net_device *orig_dev);
 117
 118         /*
 119          * Original copy of the master netdev ethtool_ops
 120          */
 121         struct ethtool_ops      master_ethtool_ops;
 122         const struct ethtool_ops *master_orig_ethtool_ops;
 123
 124         /*
 125          * The switch and port to which the CPU is attached.
 126          */
 127         s8                      cpu_switch;
 128         s8                      cpu_port;
 129
 130         /*
 131          * Data for the individual switch chips.
 132          */
 133         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 134
 135         /*
 136          * Tagging protocol operations for adding and removing an
 137          * encapsulation tag.
 138          */
 139         const struct dsa_device_ops *tag_ops;
 140 };
 141
 142 struct dsa_port {
 143         struct net_device       *netdev;
 144         struct device_node      *dn;
 145         unsigned int            ageing_time;
 146         u8                      stp_state;
 147 };
 148
 149 struct dsa_switch {
 150         struct device *dev;
 151
 152         /*
 153          * Parent switch tree, and switch index.
 154          */
 155         struct dsa_switch_tree  *dst;
 156         int                     index;
 157
 158         /*
 159          * Give the switch driver somewhere to hang its private data
 160          * structure.
 161          */
 162         void *priv;
 163
 164         /*
 165          * Configuration data for this switch.
 166          */
 167         struct dsa_chip_data    *cd;
 168
 169         /*
 170          * The switch operations.
 171          */
 172         struct dsa_switch_ops   *ops;
 173
 174         /*
 175          * An array of which element [a] indicates which port on this
 176          * switch should be used to send packets to that are destined
 177          * for switch a. Can be NULL if there is only one switch chip.
 178          */
 179         s8              rtable[DSA_MAX_SWITCHES];
 180
 181 #ifdef CONFIG_NET_DSA_HWMON
 182         /*
 183          * Hardware monitoring information
 184          */
 185         char                    hwmon_name[IFNAMSIZ + 8];
 186         struct device           *hwmon_dev;
 187 #endif
 188
 189         /*
 190          * The lower device this switch uses to talk to the host
 191          */
 192         struct net_device *master_netdev;
 193
 194         /*
 195          * Slave mii_bus and devices for the individual ports.
 196          */
 197         u32                     dsa_port_mask;
 198         u32                     cpu_port_mask;
 199         u32                     enabled_port_mask;
 200         u32                     phys_mii_mask;
 201         struct dsa_port         ports[DSA_MAX_PORTS];
 202         struct mii_bus          *slave_mii_bus;
 203 };
 204
 205 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 206 {
 207         return !!(ds->index == ds->dst->cpu_switch && p == ds->dst->cpu_port);
 208 }
 209
 210 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 211 {
 212         return !!((ds->dsa_port_mask) & (1 << p));
 213 }
 214
 215 static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
 216 {
 217         return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
 218 }
 219
 220 static inline u8 dsa_upstream_port(struct dsa_switch *ds)
 221 {
 222         struct dsa_switch_tree *dst = ds->dst;
 223
 224         /*
 225          * If this is the root switch (i.e. the switch that connects
 226          * to the CPU), return the cpu port number on this switch.
 227          * Else return the (DSA) port number that connects to the
 228          * switch that is one hop closer to the cpu.
 229          */
 230         if (dst->cpu_switch == ds->index)
 231                 return dst->cpu_port;
 232         else
 233                 return ds->rtable[dst->cpu_switch];
 234 }
 235
 236 struct switchdev_trans;
 237 struct switchdev_obj;
 238 struct switchdev_obj_port_fdb;
 239 struct switchdev_obj_port_mdb;
 240 struct switchdev_obj_port_vlan;
 241
 242 struct dsa_switch_ops {
 243         struct list_head        list;
 244
 245         /*
 246          * Probing and setup.
 247          */
 248         const char      *(*probe)(struct device *dsa_dev,
 249                                   struct device *host_dev, int sw_addr,
 250                                   void **priv);
 251
 252         enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds);
 253
 254         int     (*setup)(struct dsa_switch *ds);
 255         int     (*set_addr)(struct dsa_switch *ds, u8 *addr);
 256         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 257
 258         /*
 259          * Access to the switch's PHY registers.
 260          */
 261         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 262         int     (*phy_write)(struct dsa_switch *ds, int port,
 263                              int regnum, u16 val);
 264
 265         /*
 266          * Link state adjustment (called from libphy)
 267          */
 268         void    (*adjust_link)(struct dsa_switch *ds, int port,
 269                                 struct phy_device *phydev);
 270         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 271                                 struct fixed_phy_status *st);
 272
 273         /*
 274          * ethtool hardware statistics.
 275          */
 276         void    (*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
 277         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 278                                      int port, uint64_t *data);
 279         int     (*get_sset_count)(struct dsa_switch *ds);
 280
 281         /*
 282          * ethtool Wake-on-LAN
 283          */
 284         void    (*get_wol)(struct dsa_switch *ds, int port,
 285                            struct ethtool_wolinfo *w);
 286         int     (*set_wol)(struct dsa_switch *ds, int port,
 287                            struct ethtool_wolinfo *w);
 288
 289         /*
 290          * Suspend and resume
 291          */
 292         int     (*suspend)(struct dsa_switch *ds);
 293         int     (*resume)(struct dsa_switch *ds);
 294
 295         /*
 296          * Port enable/disable
 297          */
 298         int     (*port_enable)(struct dsa_switch *ds, int port,
 299                                struct phy_device *phy);
 300         void    (*port_disable)(struct dsa_switch *ds, int port,
 301                                 struct phy_device *phy);
 302
 303         /*
 304          * EEE setttings
 305          */
 306         int     (*set_eee)(struct dsa_switch *ds, int port,
 307                            struct phy_device *phydev,
 308                            struct ethtool_eee *e);
 309         int     (*get_eee)(struct dsa_switch *ds, int port,
 310                            struct ethtool_eee *e);
 311
 312 #ifdef CONFIG_NET_DSA_HWMON
 313         /* Hardware monitoring */
 314         int     (*get_temp)(struct dsa_switch *ds, int *temp);
 315         int     (*get_temp_limit)(struct dsa_switch *ds, int *temp);
 316         int     (*set_temp_limit)(struct dsa_switch *ds, int temp);
 317         int     (*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
 318 #endif
 319
 320         /* EEPROM access */
 321         int     (*get_eeprom_len)(struct dsa_switch *ds);
 322         int     (*get_eeprom)(struct dsa_switch *ds,
 323                               struct ethtool_eeprom *eeprom, u8 *data);
 324         int     (*set_eeprom)(struct dsa_switch *ds,
 325                               struct ethtool_eeprom *eeprom, u8 *data);
 326
 327         /*
 328          * Register access.
 329          */
 330         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 331         void    (*get_regs)(struct dsa_switch *ds, int port,
 332                             struct ethtool_regs *regs, void *p);
 333
 334         /*
 335          * Bridge integration
 336          */
 337         int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
 338         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 339                                     struct net_device *bridge);
 340         void    (*port_bridge_leave)(struct dsa_switch *ds, int port);
 341         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 342                                       u8 state);
 343         void    (*port_fast_age)(struct dsa_switch *ds, int port);
 344
 345         /*
 346          * VLAN support
 347          */
 348         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 349                                        bool vlan_filtering);
 350         int     (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 351                                      const struct switchdev_obj_port_vlan *vlan,
 352                                      struct switchdev_trans *trans);
 353         void    (*port_vlan_add)(struct dsa_switch *ds, int port,
 354                                  const struct switchdev_obj_port_vlan *vlan,
 355                                  struct switchdev_trans *trans);
 356         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 357                                  const struct switchdev_obj_port_vlan *vlan);
 358         int     (*port_vlan_dump)(struct dsa_switch *ds, int port,
 359                                   struct switchdev_obj_port_vlan *vlan,
 360                                   int (*cb)(struct switchdev_obj *obj));
 361
 362         /*
 363          * Forwarding database
 364          */
 365         int     (*port_fdb_prepare)(struct dsa_switch *ds, int port,
 366                                     const struct switchdev_obj_port_fdb *fdb,
 367                                     struct switchdev_trans *trans);
 368         void    (*port_fdb_add)(struct dsa_switch *ds, int port,
 369                                 const struct switchdev_obj_port_fdb *fdb,
 370                                 struct switchdev_trans *trans);
 371         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 372                                 const struct switchdev_obj_port_fdb *fdb);
 373         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 374                                  struct switchdev_obj_port_fdb *fdb,
 375                                  int (*cb)(struct switchdev_obj *obj));
 376
 377         /*
 378          * Multicast database
 379          */
 380         int     (*port_mdb_prepare)(struct dsa_switch *ds, int port,
 381                                     const struct switchdev_obj_port_mdb *mdb,
 382                                     struct switchdev_trans *trans);
 383         void    (*port_mdb_add)(struct dsa_switch *ds, int port,
 384                                 const struct switchdev_obj_port_mdb *mdb,
 385                                 struct switchdev_trans *trans);
 386         int     (*port_mdb_del)(struct dsa_switch *ds, int port,
 387                                 const struct switchdev_obj_port_mdb *mdb);
 388         int     (*port_mdb_dump)(struct dsa_switch *ds, int port,
 389                                  struct switchdev_obj_port_mdb *mdb,
 390                                  int (*cb)(struct switchdev_obj *obj));
 391 };
 392
 393 void register_switch_driver(struct dsa_switch_ops *type);
 394 void unregister_switch_driver(struct dsa_switch_ops *type);
 395 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 396
 397 static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
 398 {
 399         return dst->rcv != NULL;
 400 }
 401
 402 void dsa_unregister_switch(struct dsa_switch *ds);
 403 int dsa_register_switch(struct dsa_switch *ds, struct device_node *np);
 404 #ifdef CONFIG_PM_SLEEP
 405 int dsa_switch_suspend(struct dsa_switch *ds);
 406 int dsa_switch_resume(struct dsa_switch *ds);
 407 #else
 408 static inline int dsa_switch_suspend(struct dsa_switch *ds)
 409 {
 410         return 0;
 411 }
 412 static inline int dsa_switch_resume(struct dsa_switch *ds)
 413 {
 414         return 0;
 415 }
 416 #endif /* CONFIG_PM_SLEEP */
 417
 418 #endif