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