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.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/list.h>
  17 #include <linux/notifier.h>
  18 #include <linux/timer.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/of.h>
  21 #include <linux/ethtool.h>
  22 #include <linux/net_tstamp.h>
  23 #include <linux/phy.h>
  24 #include <net/devlink.h>
  25 #include <net/switchdev.h>
  26
  27 struct tc_action;
  28 struct phy_device;
  29 struct fixed_phy_status;
  30 struct phylink_link_state;
  31
  32 enum dsa_tag_protocol {
  33         DSA_TAG_PROTO_NONE = 0,
  34         DSA_TAG_PROTO_BRCM,
  35         DSA_TAG_PROTO_BRCM_PREPEND,
  36         DSA_TAG_PROTO_DSA,
  37         DSA_TAG_PROTO_EDSA,
  38         DSA_TAG_PROTO_KSZ,
  39         DSA_TAG_PROTO_LAN9303,
  40         DSA_TAG_PROTO_MTK,
  41         DSA_TAG_PROTO_QCA,
  42         DSA_TAG_PROTO_TRAILER,
  43         DSA_TAG_LAST,           /* MUST BE LAST */
  44 };
  45
  46 #define DSA_MAX_SWITCHES        4
  47 #define DSA_MAX_PORTS           12
  48
  49 #define DSA_RTABLE_NONE         -1
  50
  51 struct dsa_chip_data {
  52         /*
  53          * How to access the switch configuration registers.
  54          */
  55         struct device   *host_dev;
  56         int             sw_addr;
  57
  58         /*
  59          * Reference to network devices
  60          */
  61         struct device   *netdev[DSA_MAX_PORTS];
  62
  63         /* set to size of eeprom if supported by the switch */
  64         int             eeprom_len;
  65
  66         /* Device tree node pointer for this specific switch chip
  67          * used during switch setup in case additional properties
  68          * and resources needs to be used
  69          */
  70         struct device_node *of_node;
  71
  72         /*
  73          * The names of the switch's ports.  Use "cpu" to
  74          * designate the switch port that the cpu is connected to,
  75          * "dsa" to indicate that this port is a DSA link to
  76          * another switch, NULL to indicate the port is unused,
  77          * or any other string to indicate this is a physical port.
  78          */
  79         char            *port_names[DSA_MAX_PORTS];
  80         struct device_node *port_dn[DSA_MAX_PORTS];
  81
  82         /*
  83          * An array of which element [a] indicates which port on this
  84          * switch should be used to send packets to that are destined
  85          * for switch a. Can be NULL if there is only one switch chip.
  86          */
  87         s8              rtable[DSA_MAX_SWITCHES];
  88 };
  89
  90 struct dsa_platform_data {
  91         /*
  92          * Reference to a Linux network interface that connects
  93          * to the root switch chip of the tree.
  94          */
  95         struct device   *netdev;
  96         struct net_device *of_netdev;
  97
  98         /*
  99          * Info structs describing each of the switch chips
 100          * connected via this network interface.
 101          */
 102         int             nr_chips;
 103         struct dsa_chip_data    *chip;
 104 };
 105
 106 struct packet_type;
 107 struct dsa_switch;
 108
 109 struct dsa_device_ops {
 110         struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
 111         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
 112                                struct packet_type *pt);
 113         int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
 114                             int *offset);
 115 };
 116
 117 struct dsa_switch_tree {
 118         struct list_head        list;
 119
 120         /* Notifier chain for switch-wide events */
 121         struct raw_notifier_head        nh;
 122
 123         /* Tree identifier */
 124         unsigned int index;
 125
 126         /* Number of switches attached to this tree */
 127         struct kref refcount;
 128
 129         /* Has this tree been applied to the hardware? */
 130         bool setup;
 131
 132         /*
 133          * Configuration data for the platform device that owns
 134          * this dsa switch tree instance.
 135          */
 136         struct dsa_platform_data        *pd;
 137
 138         /*
 139          * The switch port to which the CPU is attached.
 140          */
 141         struct dsa_port         *cpu_dp;
 142
 143         /*
 144          * Data for the individual switch chips.
 145          */
 146         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 147 };
 148
 149 /* TC matchall action types, only mirroring for now */
 150 enum dsa_port_mall_action_type {
 151         DSA_PORT_MALL_MIRROR,
 152 };
 153
 154 /* TC mirroring entry */
 155 struct dsa_mall_mirror_tc_entry {
 156         u8 to_local_port;
 157         bool ingress;
 158 };
 159
 160 /* TC matchall entry */
 161 struct dsa_mall_tc_entry {
 162         struct list_head list;
 163         unsigned long cookie;
 164         enum dsa_port_mall_action_type type;
 165         union {
 166                 struct dsa_mall_mirror_tc_entry mirror;
 167         };
 168 };
 169
 170
 171 struct dsa_port {
 172         /* A CPU port is physically connected to a master device.
 173          * A user port exposed to userspace has a slave device.
 174          */
 175         union {
 176                 struct net_device *master;
 177                 struct net_device *slave;
 178         };
 179
 180         /* CPU port tagging operations used by master or slave devices */
 181         const struct dsa_device_ops *tag_ops;
 182
 183         /* Copies for faster access in master receive hot path */
 184         struct dsa_switch_tree *dst;
 185         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
 186                                struct packet_type *pt);
 187
 188         enum {
 189                 DSA_PORT_TYPE_UNUSED = 0,
 190                 DSA_PORT_TYPE_CPU,
 191                 DSA_PORT_TYPE_DSA,
 192                 DSA_PORT_TYPE_USER,
 193         } type;
 194
 195         struct dsa_switch       *ds;
 196         unsigned int            index;
 197         const char              *name;
 198         const struct dsa_port   *cpu_dp;
 199         struct device_node      *dn;
 200         unsigned int            ageing_time;
 201         u8                      stp_state;
 202         struct net_device       *bridge_dev;
 203         struct devlink_port     devlink_port;
 204         struct phylink          *pl;
 205         /*
 206          * Original copy of the master netdev ethtool_ops
 207          */
 208         const struct ethtool_ops *orig_ethtool_ops;
 209 };
 210
 211 struct dsa_switch {
 212         struct device *dev;
 213
 214         /*
 215          * Parent switch tree, and switch index.
 216          */
 217         struct dsa_switch_tree  *dst;
 218         unsigned int            index;
 219
 220         /* Listener for switch fabric events */
 221         struct notifier_block   nb;
 222
 223         /*
 224          * Give the switch driver somewhere to hang its private data
 225          * structure.
 226          */
 227         void *priv;
 228
 229         /*
 230          * Configuration data for this switch.
 231          */
 232         struct dsa_chip_data    *cd;
 233
 234         /*
 235          * The switch operations.
 236          */
 237         const struct dsa_switch_ops     *ops;
 238
 239         /*
 240          * An array of which element [a] indicates which port on this
 241          * switch should be used to send packets to that are destined
 242          * for switch a. Can be NULL if there is only one switch chip.
 243          */
 244         s8              rtable[DSA_MAX_SWITCHES];
 245
 246         /*
 247          * Slave mii_bus and devices for the individual ports.
 248          */
 249         u32                     phys_mii_mask;
 250         struct mii_bus          *slave_mii_bus;
 251
 252         /* Ageing Time limits in msecs */
 253         unsigned int ageing_time_min;
 254         unsigned int ageing_time_max;
 255
 256         /* devlink used to represent this switch device */
 257         struct devlink          *devlink;
 258
 259         /* Number of switch port queues */
 260         unsigned int            num_tx_queues;
 261
 262         unsigned long           *bitmap;
 263         unsigned long           _bitmap;
 264
 265         /* Dynamically allocated ports, keep last */
 266         size_t num_ports;
 267         struct dsa_port ports[];
 268 };
 269
 270 static inline const struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
 271 {
 272         return &ds->ports[p];
 273 }
 274
 275 static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
 276 {
 277         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
 278 }
 279
 280 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 281 {
 282         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
 283 }
 284
 285 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 286 {
 287         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
 288 }
 289
 290 static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
 291 {
 292         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
 293 }
 294
 295 static inline u32 dsa_user_ports(struct dsa_switch *ds)
 296 {
 297         u32 mask = 0;
 298         int p;
 299
 300         for (p = 0; p < ds->num_ports; p++)
 301                 if (dsa_is_user_port(ds, p))
 302                         mask |= BIT(p);
 303
 304         return mask;
 305 }
 306
 307 /* Return the local port used to reach an arbitrary switch port */
 308 static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
 309                                             int port)
 310 {
 311         if (device == ds->index)
 312                 return port;
 313         else
 314                 return ds->rtable[device];
 315 }
 316
 317 /* Return the local port used to reach the dedicated CPU port */
 318 static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
 319 {
 320         const struct dsa_port *dp = dsa_to_port(ds, port);
 321         const struct dsa_port *cpu_dp = dp->cpu_dp;
 322
 323         if (!cpu_dp)
 324                 return port;
 325
 326         return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
 327 }
 328
 329 typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
 330                               bool is_static, void *data);
 331 struct dsa_switch_ops {
 332 #if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
 333         /*
 334          * Legacy probing.
 335          */
 336         const char      *(*probe)(struct device *dsa_dev,
 337                                   struct device *host_dev, int sw_addr,
 338                                   void **priv);
 339 #endif
 340
 341         enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
 342                                                   int port);
 343
 344         int     (*setup)(struct dsa_switch *ds);
 345         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 346
 347         /*
 348          * Access to the switch's PHY registers.
 349          */
 350         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 351         int     (*phy_write)(struct dsa_switch *ds, int port,
 352                              int regnum, u16 val);
 353
 354         /*
 355          * Link state adjustment (called from libphy)
 356          */
 357         void    (*adjust_link)(struct dsa_switch *ds, int port,
 358                                 struct phy_device *phydev);
 359         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 360                                 struct fixed_phy_status *st);
 361
 362         /*
 363          * PHYLINK integration
 364          */
 365         void    (*phylink_validate)(struct dsa_switch *ds, int port,
 366                                     unsigned long *supported,
 367                                     struct phylink_link_state *state);
 368         int     (*phylink_mac_link_state)(struct dsa_switch *ds, int port,
 369                                           struct phylink_link_state *state);
 370         void    (*phylink_mac_config)(struct dsa_switch *ds, int port,
 371                                       unsigned int mode,
 372                                       const struct phylink_link_state *state);
 373         void    (*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
 374         void    (*phylink_mac_link_down)(struct dsa_switch *ds, int port,
 375                                          unsigned int mode,
 376                                          phy_interface_t interface);
 377         void    (*phylink_mac_link_up)(struct dsa_switch *ds, int port,
 378                                        unsigned int mode,
 379                                        phy_interface_t interface,
 380                                        struct phy_device *phydev);
 381         void    (*phylink_fixed_state)(struct dsa_switch *ds, int port,
 382                                        struct phylink_link_state *state);
 383         /*
 384          * ethtool hardware statistics.
 385          */
 386         void    (*get_strings)(struct dsa_switch *ds, int port,
 387                                u32 stringset, uint8_t *data);
 388         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 389                                      int port, uint64_t *data);
 390         int     (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
 391         void    (*get_ethtool_phy_stats)(struct dsa_switch *ds,
 392                                          int port, uint64_t *data);
 393
 394         /*
 395          * ethtool Wake-on-LAN
 396          */
 397         void    (*get_wol)(struct dsa_switch *ds, int port,
 398                            struct ethtool_wolinfo *w);
 399         int     (*set_wol)(struct dsa_switch *ds, int port,
 400                            struct ethtool_wolinfo *w);
 401
 402         /*
 403          * ethtool timestamp info
 404          */
 405         int     (*get_ts_info)(struct dsa_switch *ds, int port,
 406                                struct ethtool_ts_info *ts);
 407
 408         /*
 409          * Suspend and resume
 410          */
 411         int     (*suspend)(struct dsa_switch *ds);
 412         int     (*resume)(struct dsa_switch *ds);
 413
 414         /*
 415          * Port enable/disable
 416          */
 417         int     (*port_enable)(struct dsa_switch *ds, int port,
 418                                struct phy_device *phy);
 419         void    (*port_disable)(struct dsa_switch *ds, int port,
 420                                 struct phy_device *phy);
 421
 422         /*
 423          * Port's MAC EEE settings
 424          */
 425         int     (*set_mac_eee)(struct dsa_switch *ds, int port,
 426                                struct ethtool_eee *e);
 427         int     (*get_mac_eee)(struct dsa_switch *ds, int port,
 428                                struct ethtool_eee *e);
 429
 430         /* EEPROM access */
 431         int     (*get_eeprom_len)(struct dsa_switch *ds);
 432         int     (*get_eeprom)(struct dsa_switch *ds,
 433                               struct ethtool_eeprom *eeprom, u8 *data);
 434         int     (*set_eeprom)(struct dsa_switch *ds,
 435                               struct ethtool_eeprom *eeprom, u8 *data);
 436
 437         /*
 438          * Register access.
 439          */
 440         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 441         void    (*get_regs)(struct dsa_switch *ds, int port,
 442                             struct ethtool_regs *regs, void *p);
 443
 444         /*
 445          * Bridge integration
 446          */
 447         int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
 448         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 449                                     struct net_device *bridge);
 450         void    (*port_bridge_leave)(struct dsa_switch *ds, int port,
 451                                      struct net_device *bridge);
 452         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 453                                       u8 state);
 454         void    (*port_fast_age)(struct dsa_switch *ds, int port);
 455
 456         /*
 457          * VLAN support
 458          */
 459         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 460                                        bool vlan_filtering);
 461         int (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 462                                  const struct switchdev_obj_port_vlan *vlan);
 463         void (*port_vlan_add)(struct dsa_switch *ds, int port,
 464                               const struct switchdev_obj_port_vlan *vlan);
 465         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 466                                  const struct switchdev_obj_port_vlan *vlan);
 467         /*
 468          * Forwarding database
 469          */
 470         int     (*port_fdb_add)(struct dsa_switch *ds, int port,
 471                                 const unsigned char *addr, u16 vid);
 472         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 473                                 const unsigned char *addr, u16 vid);
 474         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 475                                  dsa_fdb_dump_cb_t *cb, void *data);
 476
 477         /*
 478          * Multicast database
 479          */
 480         int (*port_mdb_prepare)(struct dsa_switch *ds, int port,
 481                                 const struct switchdev_obj_port_mdb *mdb);
 482         void (*port_mdb_add)(struct dsa_switch *ds, int port,
 483                              const struct switchdev_obj_port_mdb *mdb);
 484         int     (*port_mdb_del)(struct dsa_switch *ds, int port,
 485                                 const struct switchdev_obj_port_mdb *mdb);
 486         /*
 487          * RXNFC
 488          */
 489         int     (*get_rxnfc)(struct dsa_switch *ds, int port,
 490                              struct ethtool_rxnfc *nfc, u32 *rule_locs);
 491         int     (*set_rxnfc)(struct dsa_switch *ds, int port,
 492                              struct ethtool_rxnfc *nfc);
 493
 494         /*
 495          * TC integration
 496          */
 497         int     (*port_mirror_add)(struct dsa_switch *ds, int port,
 498                                    struct dsa_mall_mirror_tc_entry *mirror,
 499                                    bool ingress);
 500         void    (*port_mirror_del)(struct dsa_switch *ds, int port,
 501                                    struct dsa_mall_mirror_tc_entry *mirror);
 502
 503         /*
 504          * Cross-chip operations
 505          */
 506         int     (*crosschip_bridge_join)(struct dsa_switch *ds, int sw_index,
 507                                          int port, struct net_device *br);
 508         void    (*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
 509                                           int port, struct net_device *br);
 510
 511         /*
 512          * PTP functionality
 513          */
 514         int     (*port_hwtstamp_get)(struct dsa_switch *ds, int port,
 515                                      struct ifreq *ifr);
 516         int     (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
 517                                      struct ifreq *ifr);
 518         bool    (*port_txtstamp)(struct dsa_switch *ds, int port,
 519                                  struct sk_buff *clone, unsigned int type);
 520         bool    (*port_rxtstamp)(struct dsa_switch *ds, int port,
 521                                  struct sk_buff *skb, unsigned int type);
 522 };
 523
 524 struct dsa_switch_driver {
 525         struct list_head        list;
 526         const struct dsa_switch_ops *ops;
 527 };
 528
 529 #if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
 530 /* Legacy driver registration */
 531 void register_switch_driver(struct dsa_switch_driver *type);
 532 void unregister_switch_driver(struct dsa_switch_driver *type);
 533 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 534
 535 #else
 536 static inline void register_switch_driver(struct dsa_switch_driver *type) { }
 537 static inline void unregister_switch_driver(struct dsa_switch_driver *type) { }
 538 static inline struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 539 {
 540         return NULL;
 541 }
 542 #endif
 543 struct net_device *dsa_dev_to_net_device(struct device *dev);
 544
 545 /* Keep inline for faster access in hot path */
 546 static inline bool netdev_uses_dsa(struct net_device *dev)
 547 {
 548 #if IS_ENABLED(CONFIG_NET_DSA)
 549         return dev->dsa_ptr && dev->dsa_ptr->rcv;
 550 #endif
 551         return false;
 552 }
 553
 554 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n);
 555 void dsa_unregister_switch(struct dsa_switch *ds);
 556 int dsa_register_switch(struct dsa_switch *ds);
 557 #ifdef CONFIG_PM_SLEEP
 558 int dsa_switch_suspend(struct dsa_switch *ds);
 559 int dsa_switch_resume(struct dsa_switch *ds);
 560 #else
 561 static inline int dsa_switch_suspend(struct dsa_switch *ds)
 562 {
 563         return 0;
 564 }
 565 static inline int dsa_switch_resume(struct dsa_switch *ds)
 566 {
 567         return 0;
 568 }
 569 #endif /* CONFIG_PM_SLEEP */
 570
 571 enum dsa_notifier_type {
 572         DSA_PORT_REGISTER,
 573         DSA_PORT_UNREGISTER,
 574 };
 575
 576 struct dsa_notifier_info {
 577         struct net_device *dev;
 578 };
 579
 580 struct dsa_notifier_register_info {
 581         struct dsa_notifier_info info;  /* must be first */
 582         struct net_device *master;
 583         unsigned int port_number;
 584         unsigned int switch_number;
 585 };
 586
 587 static inline struct net_device *
 588 dsa_notifier_info_to_dev(const struct dsa_notifier_info *info)
 589 {
 590         return info->dev;
 591 }
 592
 593 #if IS_ENABLED(CONFIG_NET_DSA)
 594 int register_dsa_notifier(struct notifier_block *nb);
 595 int unregister_dsa_notifier(struct notifier_block *nb);
 596 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 597                        struct dsa_notifier_info *info);
 598 #else
 599 static inline int register_dsa_notifier(struct notifier_block *nb)
 600 {
 601         return 0;
 602 }
 603
 604 static inline int unregister_dsa_notifier(struct notifier_block *nb)
 605 {
 606         return 0;
 607 }
 608
 609 static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 610                                      struct dsa_notifier_info *info)
 611 {
 612         return NOTIFY_DONE;
 613 }
 614 #endif
 615
 616 /* Broadcom tag specific helpers to insert and extract queue/port number */
 617 #define BRCM_TAG_SET_PORT_QUEUE(p, q)   ((p) << 8 | q)
 618 #define BRCM_TAG_GET_PORT(v)            ((v) >> 8)
 619 #define BRCM_TAG_GET_QUEUE(v)           ((v) & 0xff)
 620
 621
 622 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
 623 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
 624 int dsa_port_get_phy_sset_count(struct dsa_port *dp);
 625 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
 626
 627 #endif