include/net/dsa.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  */
   6
   7 #ifndef __LINUX_NET_DSA_H
   8 #define __LINUX_NET_DSA_H
   9
  10 #include <linux/if.h>
  11 #include <linux/if_ether.h>
  12 #include <linux/list.h>
  13 #include <linux/notifier.h>
  14 #include <linux/timer.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/of.h>
  17 #include <linux/ethtool.h>
  18 #include <linux/net_tstamp.h>
  19 #include <linux/phy.h>
  20 #include <linux/platform_data/dsa.h>
  21 #include <net/devlink.h>
  22 #include <net/switchdev.h>
  23
  24 struct tc_action;
  25 struct phy_device;
  26 struct fixed_phy_status;
  27 struct phylink_link_state;
  28
  29 #define DSA_TAG_PROTO_NONE_VALUE                0
  30 #define DSA_TAG_PROTO_BRCM_VALUE                1
  31 #define DSA_TAG_PROTO_BRCM_PREPEND_VALUE        2
  32 #define DSA_TAG_PROTO_DSA_VALUE                 3
  33 #define DSA_TAG_PROTO_EDSA_VALUE                4
  34 #define DSA_TAG_PROTO_GSWIP_VALUE               5
  35 #define DSA_TAG_PROTO_KSZ9477_VALUE             6
  36 #define DSA_TAG_PROTO_KSZ9893_VALUE             7
  37 #define DSA_TAG_PROTO_LAN9303_VALUE             8
  38 #define DSA_TAG_PROTO_MTK_VALUE                 9
  39 #define DSA_TAG_PROTO_QCA_VALUE                 10
  40 #define DSA_TAG_PROTO_TRAILER_VALUE             11
  41 #define DSA_TAG_PROTO_8021Q_VALUE               12
  42 #define DSA_TAG_PROTO_SJA1105_VALUE             13
  43
  44 enum dsa_tag_protocol {
  45         DSA_TAG_PROTO_NONE              = DSA_TAG_PROTO_NONE_VALUE,
  46         DSA_TAG_PROTO_BRCM              = DSA_TAG_PROTO_BRCM_VALUE,
  47         DSA_TAG_PROTO_BRCM_PREPEND      = DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
  48         DSA_TAG_PROTO_DSA               = DSA_TAG_PROTO_DSA_VALUE,
  49         DSA_TAG_PROTO_EDSA              = DSA_TAG_PROTO_EDSA_VALUE,
  50         DSA_TAG_PROTO_GSWIP             = DSA_TAG_PROTO_GSWIP_VALUE,
  51         DSA_TAG_PROTO_KSZ9477           = DSA_TAG_PROTO_KSZ9477_VALUE,
  52         DSA_TAG_PROTO_KSZ9893           = DSA_TAG_PROTO_KSZ9893_VALUE,
  53         DSA_TAG_PROTO_LAN9303           = DSA_TAG_PROTO_LAN9303_VALUE,
  54         DSA_TAG_PROTO_MTK               = DSA_TAG_PROTO_MTK_VALUE,
  55         DSA_TAG_PROTO_QCA               = DSA_TAG_PROTO_QCA_VALUE,
  56         DSA_TAG_PROTO_TRAILER           = DSA_TAG_PROTO_TRAILER_VALUE,
  57         DSA_TAG_PROTO_8021Q             = DSA_TAG_PROTO_8021Q_VALUE,
  58         DSA_TAG_PROTO_SJA1105           = DSA_TAG_PROTO_SJA1105_VALUE,
  59 };
  60
  61 struct packet_type;
  62 struct dsa_switch;
  63
  64 struct dsa_device_ops {
  65         struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
  66         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
  67                                struct packet_type *pt);
  68         int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
  69                             int *offset);
  70         /* Used to determine which traffic should match the DSA filter in
  71          * eth_type_trans, and which, if any, should bypass it and be processed
  72          * as regular on the master net device.
  73          */
  74         bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
  75         unsigned int overhead;
  76         const char *name;
  77         enum dsa_tag_protocol proto;
  78 };
  79
  80 #define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
  81 #define MODULE_ALIAS_DSA_TAG_DRIVER(__proto)                            \
  82         MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __stringify(__proto##_VALUE))
  83
  84 struct dsa_skb_cb {
  85         struct sk_buff *clone;
  86         bool deferred_xmit;
  87 };
  88
  89 struct __dsa_skb_cb {
  90         struct dsa_skb_cb cb;
  91         u8 priv[48 - sizeof(struct dsa_skb_cb)];
  92 };
  93
  94 #define __DSA_SKB_CB(skb) ((struct __dsa_skb_cb *)((skb)->cb))
  95
  96 #define DSA_SKB_CB(skb) ((struct dsa_skb_cb *)((skb)->cb))
  97
  98 #define DSA_SKB_CB_PRIV(skb)                    \
  99         ((void *)(skb)->cb + offsetof(struct __dsa_skb_cb, priv))
 100
 101 struct dsa_switch_tree {
 102         struct list_head        list;
 103
 104         /* Notifier chain for switch-wide events */
 105         struct raw_notifier_head        nh;
 106
 107         /* Tree identifier */
 108         unsigned int index;
 109
 110         /* Number of switches attached to this tree */
 111         struct kref refcount;
 112
 113         /* Has this tree been applied to the hardware? */
 114         bool setup;
 115
 116         /*
 117          * Configuration data for the platform device that owns
 118          * this dsa switch tree instance.
 119          */
 120         struct dsa_platform_data        *pd;
 121
 122         /*
 123          * The switch port to which the CPU is attached.
 124          */
 125         struct dsa_port         *cpu_dp;
 126
 127         /*
 128          * Data for the individual switch chips.
 129          */
 130         struct dsa_switch       *ds[DSA_MAX_SWITCHES];
 131 };
 132
 133 /* TC matchall action types, only mirroring for now */
 134 enum dsa_port_mall_action_type {
 135         DSA_PORT_MALL_MIRROR,
 136 };
 137
 138 /* TC mirroring entry */
 139 struct dsa_mall_mirror_tc_entry {
 140         u8 to_local_port;
 141         bool ingress;
 142 };
 143
 144 /* TC matchall entry */
 145 struct dsa_mall_tc_entry {
 146         struct list_head list;
 147         unsigned long cookie;
 148         enum dsa_port_mall_action_type type;
 149         union {
 150                 struct dsa_mall_mirror_tc_entry mirror;
 151         };
 152 };
 153
 154
 155 struct dsa_port {
 156         /* A CPU port is physically connected to a master device.
 157          * A user port exposed to userspace has a slave device.
 158          */
 159         union {
 160                 struct net_device *master;
 161                 struct net_device *slave;
 162         };
 163
 164         /* CPU port tagging operations used by master or slave devices */
 165         const struct dsa_device_ops *tag_ops;
 166
 167         /* Copies for faster access in master receive hot path */
 168         struct dsa_switch_tree *dst;
 169         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
 170                                struct packet_type *pt);
 171         bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
 172
 173         enum {
 174                 DSA_PORT_TYPE_UNUSED = 0,
 175                 DSA_PORT_TYPE_CPU,
 176                 DSA_PORT_TYPE_DSA,
 177                 DSA_PORT_TYPE_USER,
 178         } type;
 179
 180         struct dsa_switch       *ds;
 181         unsigned int            index;
 182         const char              *name;
 183         const struct dsa_port   *cpu_dp;
 184         const char              *mac;
 185         struct device_node      *dn;
 186         unsigned int            ageing_time;
 187         bool                    vlan_filtering;
 188         u8                      stp_state;
 189         struct net_device       *bridge_dev;
 190         struct devlink_port     devlink_port;
 191         struct phylink          *pl;
 192
 193         struct work_struct      xmit_work;
 194         struct sk_buff_head     xmit_queue;
 195
 196         /*
 197          * Give the switch driver somewhere to hang its per-port private data
 198          * structures (accessible from the tagger).
 199          */
 200         void *priv;
 201
 202         /*
 203          * Original copy of the master netdev ethtool_ops
 204          */
 205         const struct ethtool_ops *orig_ethtool_ops;
 206
 207         /*
 208          * Original copy of the master netdev net_device_ops
 209          */
 210         const struct net_device_ops *orig_ndo_ops;
 211 };
 212
 213 struct dsa_switch {
 214         struct device *dev;
 215
 216         /*
 217          * Parent switch tree, and switch index.
 218          */
 219         struct dsa_switch_tree  *dst;
 220         unsigned int            index;
 221
 222         /* Listener for switch fabric events */
 223         struct notifier_block   nb;
 224
 225         /*
 226          * Give the switch driver somewhere to hang its private data
 227          * structure.
 228          */
 229         void *priv;
 230
 231         /*
 232          * Configuration data for this switch.
 233          */
 234         struct dsa_chip_data    *cd;
 235
 236         /*
 237          * The switch operations.
 238          */
 239         const struct dsa_switch_ops     *ops;
 240
 241         /*
 242          * An array of which element [a] indicates which port on this
 243          * switch should be used to send packets to that are destined
 244          * for switch a. Can be NULL if there is only one switch chip.
 245          */
 246         s8              rtable[DSA_MAX_SWITCHES];
 247
 248         /*
 249          * Slave mii_bus and devices for the individual ports.
 250          */
 251         u32                     phys_mii_mask;
 252         struct mii_bus          *slave_mii_bus;
 253
 254         /* Ageing Time limits in msecs */
 255         unsigned int ageing_time_min;
 256         unsigned int ageing_time_max;
 257
 258         /* devlink used to represent this switch device */
 259         struct devlink          *devlink;
 260
 261         /* Number of switch port queues */
 262         unsigned int            num_tx_queues;
 263
 264         /* Disallow bridge core from requesting different VLAN awareness
 265          * settings on ports if not hardware-supported
 266          */
 267         bool                    vlan_filtering_is_global;
 268
 269         /* In case vlan_filtering_is_global is set, the VLAN awareness state
 270          * should be retrieved from here and not from the per-port settings.
 271          */
 272         bool                    vlan_filtering;
 273
 274         unsigned long           *bitmap;
 275         unsigned long           _bitmap;
 276
 277         /* Dynamically allocated ports, keep last */
 278         size_t num_ports;
 279         struct dsa_port ports[];
 280 };
 281
 282 static inline const struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
 283 {
 284         return &ds->ports[p];
 285 }
 286
 287 static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
 288 {
 289         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
 290 }
 291
 292 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 293 {
 294         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
 295 }
 296
 297 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 298 {
 299         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
 300 }
 301
 302 static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
 303 {
 304         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
 305 }
 306
 307 static inline u32 dsa_user_ports(struct dsa_switch *ds)
 308 {
 309         u32 mask = 0;
 310         int p;
 311
 312         for (p = 0; p < ds->num_ports; p++)
 313                 if (dsa_is_user_port(ds, p))
 314                         mask |= BIT(p);
 315
 316         return mask;
 317 }
 318
 319 /* Return the local port used to reach an arbitrary switch port */
 320 static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
 321                                             int port)
 322 {
 323         if (device == ds->index)
 324                 return port;
 325         else
 326                 return ds->rtable[device];
 327 }
 328
 329 /* Return the local port used to reach the dedicated CPU port */
 330 static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
 331 {
 332         const struct dsa_port *dp = dsa_to_port(ds, port);
 333         const struct dsa_port *cpu_dp = dp->cpu_dp;
 334
 335         if (!cpu_dp)
 336                 return port;
 337
 338         return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
 339 }
 340
 341 static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
 342 {
 343         const struct dsa_switch *ds = dp->ds;
 344
 345         if (ds->vlan_filtering_is_global)
 346                 return ds->vlan_filtering;
 347         else
 348                 return dp->vlan_filtering;
 349 }
 350
 351 typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
 352                               bool is_static, void *data);
 353 struct dsa_switch_ops {
 354         enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
 355                                                   int port);
 356
 357         int     (*setup)(struct dsa_switch *ds);
 358         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 359
 360         /*
 361          * Access to the switch's PHY registers.
 362          */
 363         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 364         int     (*phy_write)(struct dsa_switch *ds, int port,
 365                              int regnum, u16 val);
 366
 367         /*
 368          * Link state adjustment (called from libphy)
 369          */
 370         void    (*adjust_link)(struct dsa_switch *ds, int port,
 371                                 struct phy_device *phydev);
 372         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 373                                 struct fixed_phy_status *st);
 374
 375         /*
 376          * PHYLINK integration
 377          */
 378         void    (*phylink_validate)(struct dsa_switch *ds, int port,
 379                                     unsigned long *supported,
 380                                     struct phylink_link_state *state);
 381         int     (*phylink_mac_link_state)(struct dsa_switch *ds, int port,
 382                                           struct phylink_link_state *state);
 383         void    (*phylink_mac_config)(struct dsa_switch *ds, int port,
 384                                       unsigned int mode,
 385                                       const struct phylink_link_state *state);
 386         void    (*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
 387         void    (*phylink_mac_link_down)(struct dsa_switch *ds, int port,
 388                                          unsigned int mode,
 389                                          phy_interface_t interface);
 390         void    (*phylink_mac_link_up)(struct dsa_switch *ds, int port,
 391                                        unsigned int mode,
 392                                        phy_interface_t interface,
 393                                        struct phy_device *phydev);
 394         void    (*phylink_fixed_state)(struct dsa_switch *ds, int port,
 395                                        struct phylink_link_state *state);
 396         /*
 397          * ethtool hardware statistics.
 398          */
 399         void    (*get_strings)(struct dsa_switch *ds, int port,
 400                                u32 stringset, uint8_t *data);
 401         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 402                                      int port, uint64_t *data);
 403         int     (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
 404         void    (*get_ethtool_phy_stats)(struct dsa_switch *ds,
 405                                          int port, uint64_t *data);
 406
 407         /*
 408          * ethtool Wake-on-LAN
 409          */
 410         void    (*get_wol)(struct dsa_switch *ds, int port,
 411                            struct ethtool_wolinfo *w);
 412         int     (*set_wol)(struct dsa_switch *ds, int port,
 413                            struct ethtool_wolinfo *w);
 414
 415         /*
 416          * ethtool timestamp info
 417          */
 418         int     (*get_ts_info)(struct dsa_switch *ds, int port,
 419                                struct ethtool_ts_info *ts);
 420
 421         /*
 422          * Suspend and resume
 423          */
 424         int     (*suspend)(struct dsa_switch *ds);
 425         int     (*resume)(struct dsa_switch *ds);
 426
 427         /*
 428          * Port enable/disable
 429          */
 430         int     (*port_enable)(struct dsa_switch *ds, int port,
 431                                struct phy_device *phy);
 432         void    (*port_disable)(struct dsa_switch *ds, int port);
 433
 434         /*
 435          * Port's MAC EEE settings
 436          */
 437         int     (*set_mac_eee)(struct dsa_switch *ds, int port,
 438                                struct ethtool_eee *e);
 439         int     (*get_mac_eee)(struct dsa_switch *ds, int port,
 440                                struct ethtool_eee *e);
 441
 442         /* EEPROM access */
 443         int     (*get_eeprom_len)(struct dsa_switch *ds);
 444         int     (*get_eeprom)(struct dsa_switch *ds,
 445                               struct ethtool_eeprom *eeprom, u8 *data);
 446         int     (*set_eeprom)(struct dsa_switch *ds,
 447                               struct ethtool_eeprom *eeprom, u8 *data);
 448
 449         /*
 450          * Register access.
 451          */
 452         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 453         void    (*get_regs)(struct dsa_switch *ds, int port,
 454                             struct ethtool_regs *regs, void *p);
 455
 456         /*
 457          * Bridge integration
 458          */
 459         int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
 460         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 461                                     struct net_device *bridge);
 462         void    (*port_bridge_leave)(struct dsa_switch *ds, int port,
 463                                      struct net_device *bridge);
 464         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 465                                       u8 state);
 466         void    (*port_fast_age)(struct dsa_switch *ds, int port);
 467         int     (*port_egress_floods)(struct dsa_switch *ds, int port,
 468                                       bool unicast, bool multicast);
 469
 470         /*
 471          * VLAN support
 472          */
 473         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 474                                        bool vlan_filtering);
 475         int (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 476                                  const struct switchdev_obj_port_vlan *vlan);
 477         void (*port_vlan_add)(struct dsa_switch *ds, int port,
 478                               const struct switchdev_obj_port_vlan *vlan);
 479         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 480                                  const struct switchdev_obj_port_vlan *vlan);
 481         /*
 482          * Forwarding database
 483          */
 484         int     (*port_fdb_add)(struct dsa_switch *ds, int port,
 485                                 const unsigned char *addr, u16 vid);
 486         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 487                                 const unsigned char *addr, u16 vid);
 488         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 489                                  dsa_fdb_dump_cb_t *cb, void *data);
 490
 491         /*
 492          * Multicast database
 493          */
 494         int (*port_mdb_prepare)(struct dsa_switch *ds, int port,
 495                                 const struct switchdev_obj_port_mdb *mdb);
 496         void (*port_mdb_add)(struct dsa_switch *ds, int port,
 497                              const struct switchdev_obj_port_mdb *mdb);
 498         int     (*port_mdb_del)(struct dsa_switch *ds, int port,
 499                                 const struct switchdev_obj_port_mdb *mdb);
 500         /*
 501          * RXNFC
 502          */
 503         int     (*get_rxnfc)(struct dsa_switch *ds, int port,
 504                              struct ethtool_rxnfc *nfc, u32 *rule_locs);
 505         int     (*set_rxnfc)(struct dsa_switch *ds, int port,
 506                              struct ethtool_rxnfc *nfc);
 507
 508         /*
 509          * TC integration
 510          */
 511         int     (*port_mirror_add)(struct dsa_switch *ds, int port,
 512                                    struct dsa_mall_mirror_tc_entry *mirror,
 513                                    bool ingress);
 514         void    (*port_mirror_del)(struct dsa_switch *ds, int port,
 515                                    struct dsa_mall_mirror_tc_entry *mirror);
 516
 517         /*
 518          * Cross-chip operations
 519          */
 520         int     (*crosschip_bridge_join)(struct dsa_switch *ds, int sw_index,
 521                                          int port, struct net_device *br);
 522         void    (*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
 523                                           int port, struct net_device *br);
 524
 525         /*
 526          * PTP functionality
 527          */
 528         int     (*port_hwtstamp_get)(struct dsa_switch *ds, int port,
 529                                      struct ifreq *ifr);
 530         int     (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
 531                                      struct ifreq *ifr);
 532         bool    (*port_txtstamp)(struct dsa_switch *ds, int port,
 533                                  struct sk_buff *clone, unsigned int type);
 534         bool    (*port_rxtstamp)(struct dsa_switch *ds, int port,
 535                                  struct sk_buff *skb, unsigned int type);
 536
 537         /*
 538          * Deferred frame Tx
 539          */
 540         netdev_tx_t (*port_deferred_xmit)(struct dsa_switch *ds, int port,
 541                                           struct sk_buff *skb);
 542 };
 543
 544 struct dsa_switch_driver {
 545         struct list_head        list;
 546         const struct dsa_switch_ops *ops;
 547 };
 548
 549 struct net_device *dsa_dev_to_net_device(struct device *dev);
 550
 551 /* Keep inline for faster access in hot path */
 552 static inline bool netdev_uses_dsa(struct net_device *dev)
 553 {
 554 #if IS_ENABLED(CONFIG_NET_DSA)
 555         return dev->dsa_ptr && dev->dsa_ptr->rcv;
 556 #endif
 557         return false;
 558 }
 559
 560 static inline bool dsa_can_decode(const struct sk_buff *skb,
 561                                   struct net_device *dev)
 562 {
 563 #if IS_ENABLED(CONFIG_NET_DSA)
 564         return !dev->dsa_ptr->filter || dev->dsa_ptr->filter(skb, dev);
 565 #endif
 566         return false;
 567 }
 568
 569 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n);
 570 void dsa_unregister_switch(struct dsa_switch *ds);
 571 int dsa_register_switch(struct dsa_switch *ds);
 572 #ifdef CONFIG_PM_SLEEP
 573 int dsa_switch_suspend(struct dsa_switch *ds);
 574 int dsa_switch_resume(struct dsa_switch *ds);
 575 #else
 576 static inline int dsa_switch_suspend(struct dsa_switch *ds)
 577 {
 578         return 0;
 579 }
 580 static inline int dsa_switch_resume(struct dsa_switch *ds)
 581 {
 582         return 0;
 583 }
 584 #endif /* CONFIG_PM_SLEEP */
 585
 586 enum dsa_notifier_type {
 587         DSA_PORT_REGISTER,
 588         DSA_PORT_UNREGISTER,
 589 };
 590
 591 struct dsa_notifier_info {
 592         struct net_device *dev;
 593 };
 594
 595 struct dsa_notifier_register_info {
 596         struct dsa_notifier_info info;  /* must be first */
 597         struct net_device *master;
 598         unsigned int port_number;
 599         unsigned int switch_number;
 600 };
 601
 602 static inline struct net_device *
 603 dsa_notifier_info_to_dev(const struct dsa_notifier_info *info)
 604 {
 605         return info->dev;
 606 }
 607
 608 #if IS_ENABLED(CONFIG_NET_DSA)
 609 int register_dsa_notifier(struct notifier_block *nb);
 610 int unregister_dsa_notifier(struct notifier_block *nb);
 611 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 612                        struct dsa_notifier_info *info);
 613 #else
 614 static inline int register_dsa_notifier(struct notifier_block *nb)
 615 {
 616         return 0;
 617 }
 618
 619 static inline int unregister_dsa_notifier(struct notifier_block *nb)
 620 {
 621         return 0;
 622 }
 623
 624 static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 625                                      struct dsa_notifier_info *info)
 626 {
 627         return NOTIFY_DONE;
 628 }
 629 #endif
 630
 631 /* Broadcom tag specific helpers to insert and extract queue/port number */
 632 #define BRCM_TAG_SET_PORT_QUEUE(p, q)   ((p) << 8 | q)
 633 #define BRCM_TAG_GET_PORT(v)            ((v) >> 8)
 634 #define BRCM_TAG_GET_QUEUE(v)           ((v) & 0xff)
 635
 636
 637 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
 638 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
 639 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
 640 int dsa_port_get_phy_sset_count(struct dsa_port *dp);
 641 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
 642
 643 struct dsa_tag_driver {
 644         const struct dsa_device_ops *ops;
 645         struct list_head list;
 646         struct module *owner;
 647 };
 648
 649 void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
 650                               unsigned int count,
 651                               struct module *owner);
 652 void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
 653                                 unsigned int count);
 654
 655 #define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count) \
 656 static int __init dsa_tag_driver_module_init(void)                      \
 657 {                                                                       \
 658         dsa_tag_drivers_register(__dsa_tag_drivers_array, __count,      \
 659                                  THIS_MODULE);                          \
 660         return 0;                                                       \
 661 }                                                                       \
 662 module_init(dsa_tag_driver_module_init);                                \
 663                                                                         \
 664 static void __exit dsa_tag_driver_module_exit(void)                     \
 665 {                                                                       \
 666         dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count);   \
 667 }                                                                       \
 668 module_exit(dsa_tag_driver_module_exit)
 669
 670 /**
 671  * module_dsa_tag_drivers() - Helper macro for registering DSA tag
 672  * drivers
 673  * @__ops_array: Array of tag driver strucutres
 674  *
 675  * Helper macro for DSA tag drivers which do not do anything special
 676  * in module init/exit. Each module may only use this macro once, and
 677  * calling it replaces module_init() and module_exit().
 678  */
 679 #define module_dsa_tag_drivers(__ops_array)                             \
 680 dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
 681
 682 #define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
 683
 684 /* Create a static structure we can build a linked list of dsa_tag
 685  * drivers
 686  */
 687 #define DSA_TAG_DRIVER(__ops)                                           \
 688 static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = {             \
 689         .ops = &__ops,                                                  \
 690 }
 691
 692 /**
 693  * module_dsa_tag_driver() - Helper macro for registering a single DSA tag
 694  * driver
 695  * @__ops: Single tag driver structures
 696  *
 697  * Helper macro for DSA tag drivers which do not do anything special
 698  * in module init/exit. Each module may only use this macro once, and
 699  * calling it replaces module_init() and module_exit().
 700  */
 701 #define module_dsa_tag_driver(__ops)                                    \
 702 DSA_TAG_DRIVER(__ops);                                                  \
 703                                                                         \
 704 static struct dsa_tag_driver *dsa_tag_driver_array[] =  {               \
 705         &DSA_TAG_DRIVER_NAME(__ops)                                     \
 706 };                                                                      \
 707 module_dsa_tag_drivers(dsa_tag_driver_array)
 708 #endif
 709