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 <linux/phylink.h>
  22 #include <net/devlink.h>
  23 #include <net/switchdev.h>
  24
  25 struct tc_action;
  26 struct phy_device;
  27 struct fixed_phy_status;
  28 struct phylink_link_state;
  29
  30 #define DSA_TAG_PROTO_NONE_VALUE                0
  31 #define DSA_TAG_PROTO_BRCM_VALUE                1
  32 #define DSA_TAG_PROTO_BRCM_PREPEND_VALUE        2
  33 #define DSA_TAG_PROTO_DSA_VALUE                 3
  34 #define DSA_TAG_PROTO_EDSA_VALUE                4
  35 #define DSA_TAG_PROTO_GSWIP_VALUE               5
  36 #define DSA_TAG_PROTO_KSZ9477_VALUE             6
  37 #define DSA_TAG_PROTO_KSZ9893_VALUE             7
  38 #define DSA_TAG_PROTO_LAN9303_VALUE             8
  39 #define DSA_TAG_PROTO_MTK_VALUE                 9
  40 #define DSA_TAG_PROTO_QCA_VALUE                 10
  41 #define DSA_TAG_PROTO_TRAILER_VALUE             11
  42 #define DSA_TAG_PROTO_8021Q_VALUE               12
  43 #define DSA_TAG_PROTO_SJA1105_VALUE             13
  44 #define DSA_TAG_PROTO_KSZ8795_VALUE             14
  45 #define DSA_TAG_PROTO_OCELOT_VALUE              15
  46 #define DSA_TAG_PROTO_AR9331_VALUE              16
  47
  48 enum dsa_tag_protocol {
  49         DSA_TAG_PROTO_NONE              = DSA_TAG_PROTO_NONE_VALUE,
  50         DSA_TAG_PROTO_BRCM              = DSA_TAG_PROTO_BRCM_VALUE,
  51         DSA_TAG_PROTO_BRCM_PREPEND      = DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
  52         DSA_TAG_PROTO_DSA               = DSA_TAG_PROTO_DSA_VALUE,
  53         DSA_TAG_PROTO_EDSA              = DSA_TAG_PROTO_EDSA_VALUE,
  54         DSA_TAG_PROTO_GSWIP             = DSA_TAG_PROTO_GSWIP_VALUE,
  55         DSA_TAG_PROTO_KSZ9477           = DSA_TAG_PROTO_KSZ9477_VALUE,
  56         DSA_TAG_PROTO_KSZ9893           = DSA_TAG_PROTO_KSZ9893_VALUE,
  57         DSA_TAG_PROTO_LAN9303           = DSA_TAG_PROTO_LAN9303_VALUE,
  58         DSA_TAG_PROTO_MTK               = DSA_TAG_PROTO_MTK_VALUE,
  59         DSA_TAG_PROTO_QCA               = DSA_TAG_PROTO_QCA_VALUE,
  60         DSA_TAG_PROTO_TRAILER           = DSA_TAG_PROTO_TRAILER_VALUE,
  61         DSA_TAG_PROTO_8021Q             = DSA_TAG_PROTO_8021Q_VALUE,
  62         DSA_TAG_PROTO_SJA1105           = DSA_TAG_PROTO_SJA1105_VALUE,
  63         DSA_TAG_PROTO_KSZ8795           = DSA_TAG_PROTO_KSZ8795_VALUE,
  64         DSA_TAG_PROTO_OCELOT            = DSA_TAG_PROTO_OCELOT_VALUE,
  65         DSA_TAG_PROTO_AR9331            = DSA_TAG_PROTO_AR9331_VALUE,
  66 };
  67
  68 struct packet_type;
  69 struct dsa_switch;
  70
  71 struct dsa_device_ops {
  72         struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
  73         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
  74                                struct packet_type *pt);
  75         int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
  76                             int *offset);
  77         /* Used to determine which traffic should match the DSA filter in
  78          * eth_type_trans, and which, if any, should bypass it and be processed
  79          * as regular on the master net device.
  80          */
  81         bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
  82         unsigned int overhead;
  83         const char *name;
  84         enum dsa_tag_protocol proto;
  85 };
  86
  87 #define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
  88 #define MODULE_ALIAS_DSA_TAG_DRIVER(__proto)                            \
  89         MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __stringify(__proto##_VALUE))
  90
  91 struct dsa_skb_cb {
  92         struct sk_buff *clone;
  93 };
  94
  95 struct __dsa_skb_cb {
  96         struct dsa_skb_cb cb;
  97         u8 priv[48 - sizeof(struct dsa_skb_cb)];
  98 };
  99
 100 #define DSA_SKB_CB(skb) ((struct dsa_skb_cb *)((skb)->cb))
 101
 102 #define DSA_SKB_CB_PRIV(skb)                    \
 103         ((void *)(skb)->cb + offsetof(struct __dsa_skb_cb, priv))
 104
 105 struct dsa_switch_tree {
 106         struct list_head        list;
 107
 108         /* Notifier chain for switch-wide events */
 109         struct raw_notifier_head        nh;
 110
 111         /* Tree identifier */
 112         unsigned int index;
 113
 114         /* Number of switches attached to this tree */
 115         struct kref refcount;
 116
 117         /* Has this tree been applied to the hardware? */
 118         bool setup;
 119
 120         /*
 121          * Configuration data for the platform device that owns
 122          * this dsa switch tree instance.
 123          */
 124         struct dsa_platform_data        *pd;
 125
 126         /* List of switch ports */
 127         struct list_head ports;
 128
 129         /* List of DSA links composing the routing table */
 130         struct list_head rtable;
 131 };
 132
 133 /* TC matchall action types */
 134 enum dsa_port_mall_action_type {
 135         DSA_PORT_MALL_MIRROR,
 136         DSA_PORT_MALL_POLICER,
 137 };
 138
 139 /* TC mirroring entry */
 140 struct dsa_mall_mirror_tc_entry {
 141         u8 to_local_port;
 142         bool ingress;
 143 };
 144
 145 /* TC port policer entry */
 146 struct dsa_mall_policer_tc_entry {
 147         s64 burst;
 148         u64 rate_bytes_per_sec;
 149 };
 150
 151 /* TC matchall entry */
 152 struct dsa_mall_tc_entry {
 153         struct list_head list;
 154         unsigned long cookie;
 155         enum dsa_port_mall_action_type type;
 156         union {
 157                 struct dsa_mall_mirror_tc_entry mirror;
 158                 struct dsa_mall_policer_tc_entry policer;
 159         };
 160 };
 161
 162
 163 struct dsa_port {
 164         /* A CPU port is physically connected to a master device.
 165          * A user port exposed to userspace has a slave device.
 166          */
 167         union {
 168                 struct net_device *master;
 169                 struct net_device *slave;
 170         };
 171
 172         /* CPU port tagging operations used by master or slave devices */
 173         const struct dsa_device_ops *tag_ops;
 174
 175         /* Copies for faster access in master receive hot path */
 176         struct dsa_switch_tree *dst;
 177         struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
 178                                struct packet_type *pt);
 179         bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
 180
 181         enum {
 182                 DSA_PORT_TYPE_UNUSED = 0,
 183                 DSA_PORT_TYPE_CPU,
 184                 DSA_PORT_TYPE_DSA,
 185                 DSA_PORT_TYPE_USER,
 186         } type;
 187
 188         struct dsa_switch       *ds;
 189         unsigned int            index;
 190         const char              *name;
 191         struct dsa_port         *cpu_dp;
 192         const char              *mac;
 193         struct device_node      *dn;
 194         unsigned int            ageing_time;
 195         bool                    vlan_filtering;
 196         u8                      stp_state;
 197         struct net_device       *bridge_dev;
 198         struct devlink_port     devlink_port;
 199         struct phylink          *pl;
 200         struct phylink_config   pl_config;
 201
 202         struct list_head list;
 203
 204         /*
 205          * Give the switch driver somewhere to hang its per-port private data
 206          * structures (accessible from the tagger).
 207          */
 208         void *priv;
 209
 210         /*
 211          * Original copy of the master netdev ethtool_ops
 212          */
 213         const struct ethtool_ops *orig_ethtool_ops;
 214
 215         /*
 216          * Original copy of the master netdev net_device_ops
 217          */
 218         const struct net_device_ops *orig_ndo_ops;
 219
 220         bool setup;
 221 };
 222
 223 /* TODO: ideally DSA ports would have a single dp->link_dp member,
 224  * and no dst->rtable nor this struct dsa_link would be needed,
 225  * but this would require some more complex tree walking,
 226  * so keep it stupid at the moment and list them all.
 227  */
 228 struct dsa_link {
 229         struct dsa_port *dp;
 230         struct dsa_port *link_dp;
 231         struct list_head list;
 232 };
 233
 234 struct dsa_switch {
 235         bool setup;
 236
 237         struct device *dev;
 238
 239         /*
 240          * Parent switch tree, and switch index.
 241          */
 242         struct dsa_switch_tree  *dst;
 243         unsigned int            index;
 244
 245         /* Listener for switch fabric events */
 246         struct notifier_block   nb;
 247
 248         /*
 249          * Give the switch driver somewhere to hang its private data
 250          * structure.
 251          */
 252         void *priv;
 253
 254         /*
 255          * Configuration data for this switch.
 256          */
 257         struct dsa_chip_data    *cd;
 258
 259         /*
 260          * The switch operations.
 261          */
 262         const struct dsa_switch_ops     *ops;
 263
 264         /*
 265          * Slave mii_bus and devices for the individual ports.
 266          */
 267         u32                     phys_mii_mask;
 268         struct mii_bus          *slave_mii_bus;
 269
 270         /* Ageing Time limits in msecs */
 271         unsigned int ageing_time_min;
 272         unsigned int ageing_time_max;
 273
 274         /* devlink used to represent this switch device */
 275         struct devlink          *devlink;
 276
 277         /* Number of switch port queues */
 278         unsigned int            num_tx_queues;
 279
 280         /* Disallow bridge core from requesting different VLAN awareness
 281          * settings on ports if not hardware-supported
 282          */
 283         bool                    vlan_filtering_is_global;
 284
 285         /* In case vlan_filtering_is_global is set, the VLAN awareness state
 286          * should be retrieved from here and not from the per-port settings.
 287          */
 288         bool                    vlan_filtering;
 289
 290         /* MAC PCS does not provide link state change interrupt, and requires
 291          * polling. Flag passed on to PHYLINK.
 292          */
 293         bool                    pcs_poll;
 294
 295         /* For switches that only have the MRU configurable. To ensure the
 296          * configured MTU is not exceeded, normalization of MRU on all bridged
 297          * interfaces is needed.
 298          */
 299         bool                    mtu_enforcement_ingress;
 300
 301         size_t num_ports;
 302 };
 303
 304 static inline struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
 305 {
 306         struct dsa_switch_tree *dst = ds->dst;
 307         struct dsa_port *dp;
 308
 309         list_for_each_entry(dp, &dst->ports, list)
 310                 if (dp->ds == ds && dp->index == p)
 311                         return dp;
 312
 313         return NULL;
 314 }
 315
 316 static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
 317 {
 318         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
 319 }
 320
 321 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
 322 {
 323         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
 324 }
 325
 326 static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
 327 {
 328         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
 329 }
 330
 331 static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
 332 {
 333         return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
 334 }
 335
 336 static inline u32 dsa_user_ports(struct dsa_switch *ds)
 337 {
 338         u32 mask = 0;
 339         int p;
 340
 341         for (p = 0; p < ds->num_ports; p++)
 342                 if (dsa_is_user_port(ds, p))
 343                         mask |= BIT(p);
 344
 345         return mask;
 346 }
 347
 348 /* Return the local port used to reach an arbitrary switch device */
 349 static inline unsigned int dsa_routing_port(struct dsa_switch *ds, int device)
 350 {
 351         struct dsa_switch_tree *dst = ds->dst;
 352         struct dsa_link *dl;
 353
 354         list_for_each_entry(dl, &dst->rtable, list)
 355                 if (dl->dp->ds == ds && dl->link_dp->ds->index == device)
 356                         return dl->dp->index;
 357
 358         return ds->num_ports;
 359 }
 360
 361 /* Return the local port used to reach an arbitrary switch port */
 362 static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
 363                                             int port)
 364 {
 365         if (device == ds->index)
 366                 return port;
 367         else
 368                 return dsa_routing_port(ds, device);
 369 }
 370
 371 /* Return the local port used to reach the dedicated CPU port */
 372 static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
 373 {
 374         const struct dsa_port *dp = dsa_to_port(ds, port);
 375         const struct dsa_port *cpu_dp = dp->cpu_dp;
 376
 377         if (!cpu_dp)
 378                 return port;
 379
 380         return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
 381 }
 382
 383 static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
 384 {
 385         const struct dsa_switch *ds = dp->ds;
 386
 387         if (ds->vlan_filtering_is_global)
 388                 return ds->vlan_filtering;
 389         else
 390                 return dp->vlan_filtering;
 391 }
 392
 393 typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
 394                               bool is_static, void *data);
 395 struct dsa_switch_ops {
 396         enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
 397                                                   int port,
 398                                                   enum dsa_tag_protocol mprot);
 399
 400         int     (*setup)(struct dsa_switch *ds);
 401         void    (*teardown)(struct dsa_switch *ds);
 402         u32     (*get_phy_flags)(struct dsa_switch *ds, int port);
 403
 404         /*
 405          * Access to the switch's PHY registers.
 406          */
 407         int     (*phy_read)(struct dsa_switch *ds, int port, int regnum);
 408         int     (*phy_write)(struct dsa_switch *ds, int port,
 409                              int regnum, u16 val);
 410
 411         /*
 412          * Link state adjustment (called from libphy)
 413          */
 414         void    (*adjust_link)(struct dsa_switch *ds, int port,
 415                                 struct phy_device *phydev);
 416         void    (*fixed_link_update)(struct dsa_switch *ds, int port,
 417                                 struct fixed_phy_status *st);
 418
 419         /*
 420          * PHYLINK integration
 421          */
 422         void    (*phylink_validate)(struct dsa_switch *ds, int port,
 423                                     unsigned long *supported,
 424                                     struct phylink_link_state *state);
 425         int     (*phylink_mac_link_state)(struct dsa_switch *ds, int port,
 426                                           struct phylink_link_state *state);
 427         void    (*phylink_mac_config)(struct dsa_switch *ds, int port,
 428                                       unsigned int mode,
 429                                       const struct phylink_link_state *state);
 430         void    (*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
 431         void    (*phylink_mac_link_down)(struct dsa_switch *ds, int port,
 432                                          unsigned int mode,
 433                                          phy_interface_t interface);
 434         void    (*phylink_mac_link_up)(struct dsa_switch *ds, int port,
 435                                        unsigned int mode,
 436                                        phy_interface_t interface,
 437                                        struct phy_device *phydev,
 438                                        int speed, int duplex,
 439                                        bool tx_pause, bool rx_pause);
 440         void    (*phylink_fixed_state)(struct dsa_switch *ds, int port,
 441                                        struct phylink_link_state *state);
 442         /*
 443          * ethtool hardware statistics.
 444          */
 445         void    (*get_strings)(struct dsa_switch *ds, int port,
 446                                u32 stringset, uint8_t *data);
 447         void    (*get_ethtool_stats)(struct dsa_switch *ds,
 448                                      int port, uint64_t *data);
 449         int     (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
 450         void    (*get_ethtool_phy_stats)(struct dsa_switch *ds,
 451                                          int port, uint64_t *data);
 452
 453         /*
 454          * ethtool Wake-on-LAN
 455          */
 456         void    (*get_wol)(struct dsa_switch *ds, int port,
 457                            struct ethtool_wolinfo *w);
 458         int     (*set_wol)(struct dsa_switch *ds, int port,
 459                            struct ethtool_wolinfo *w);
 460
 461         /*
 462          * ethtool timestamp info
 463          */
 464         int     (*get_ts_info)(struct dsa_switch *ds, int port,
 465                                struct ethtool_ts_info *ts);
 466
 467         /*
 468          * Suspend and resume
 469          */
 470         int     (*suspend)(struct dsa_switch *ds);
 471         int     (*resume)(struct dsa_switch *ds);
 472
 473         /*
 474          * Port enable/disable
 475          */
 476         int     (*port_enable)(struct dsa_switch *ds, int port,
 477                                struct phy_device *phy);
 478         void    (*port_disable)(struct dsa_switch *ds, int port);
 479
 480         /*
 481          * Port's MAC EEE settings
 482          */
 483         int     (*set_mac_eee)(struct dsa_switch *ds, int port,
 484                                struct ethtool_eee *e);
 485         int     (*get_mac_eee)(struct dsa_switch *ds, int port,
 486                                struct ethtool_eee *e);
 487
 488         /* EEPROM access */
 489         int     (*get_eeprom_len)(struct dsa_switch *ds);
 490         int     (*get_eeprom)(struct dsa_switch *ds,
 491                               struct ethtool_eeprom *eeprom, u8 *data);
 492         int     (*set_eeprom)(struct dsa_switch *ds,
 493                               struct ethtool_eeprom *eeprom, u8 *data);
 494
 495         /*
 496          * Register access.
 497          */
 498         int     (*get_regs_len)(struct dsa_switch *ds, int port);
 499         void    (*get_regs)(struct dsa_switch *ds, int port,
 500                             struct ethtool_regs *regs, void *p);
 501
 502         /*
 503          * Bridge integration
 504          */
 505         int     (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
 506         int     (*port_bridge_join)(struct dsa_switch *ds, int port,
 507                                     struct net_device *bridge);
 508         void    (*port_bridge_leave)(struct dsa_switch *ds, int port,
 509                                      struct net_device *bridge);
 510         void    (*port_stp_state_set)(struct dsa_switch *ds, int port,
 511                                       u8 state);
 512         void    (*port_fast_age)(struct dsa_switch *ds, int port);
 513         int     (*port_egress_floods)(struct dsa_switch *ds, int port,
 514                                       bool unicast, bool multicast);
 515
 516         /*
 517          * VLAN support
 518          */
 519         int     (*port_vlan_filtering)(struct dsa_switch *ds, int port,
 520                                        bool vlan_filtering);
 521         int (*port_vlan_prepare)(struct dsa_switch *ds, int port,
 522                                  const struct switchdev_obj_port_vlan *vlan);
 523         void (*port_vlan_add)(struct dsa_switch *ds, int port,
 524                               const struct switchdev_obj_port_vlan *vlan);
 525         int     (*port_vlan_del)(struct dsa_switch *ds, int port,
 526                                  const struct switchdev_obj_port_vlan *vlan);
 527         /*
 528          * Forwarding database
 529          */
 530         int     (*port_fdb_add)(struct dsa_switch *ds, int port,
 531                                 const unsigned char *addr, u16 vid);
 532         int     (*port_fdb_del)(struct dsa_switch *ds, int port,
 533                                 const unsigned char *addr, u16 vid);
 534         int     (*port_fdb_dump)(struct dsa_switch *ds, int port,
 535                                  dsa_fdb_dump_cb_t *cb, void *data);
 536
 537         /*
 538          * Multicast database
 539          */
 540         int (*port_mdb_prepare)(struct dsa_switch *ds, int port,
 541                                 const struct switchdev_obj_port_mdb *mdb);
 542         void (*port_mdb_add)(struct dsa_switch *ds, int port,
 543                              const struct switchdev_obj_port_mdb *mdb);
 544         int     (*port_mdb_del)(struct dsa_switch *ds, int port,
 545                                 const struct switchdev_obj_port_mdb *mdb);
 546         /*
 547          * RXNFC
 548          */
 549         int     (*get_rxnfc)(struct dsa_switch *ds, int port,
 550                              struct ethtool_rxnfc *nfc, u32 *rule_locs);
 551         int     (*set_rxnfc)(struct dsa_switch *ds, int port,
 552                              struct ethtool_rxnfc *nfc);
 553
 554         /*
 555          * TC integration
 556          */
 557         int     (*cls_flower_add)(struct dsa_switch *ds, int port,
 558                                   struct flow_cls_offload *cls, bool ingress);
 559         int     (*cls_flower_del)(struct dsa_switch *ds, int port,
 560                                   struct flow_cls_offload *cls, bool ingress);
 561         int     (*cls_flower_stats)(struct dsa_switch *ds, int port,
 562                                     struct flow_cls_offload *cls, bool ingress);
 563         int     (*port_mirror_add)(struct dsa_switch *ds, int port,
 564                                    struct dsa_mall_mirror_tc_entry *mirror,
 565                                    bool ingress);
 566         void    (*port_mirror_del)(struct dsa_switch *ds, int port,
 567                                    struct dsa_mall_mirror_tc_entry *mirror);
 568         int     (*port_policer_add)(struct dsa_switch *ds, int port,
 569                                     struct dsa_mall_policer_tc_entry *policer);
 570         void    (*port_policer_del)(struct dsa_switch *ds, int port);
 571         int     (*port_setup_tc)(struct dsa_switch *ds, int port,
 572                                  enum tc_setup_type type, void *type_data);
 573
 574         /*
 575          * Cross-chip operations
 576          */
 577         int     (*crosschip_bridge_join)(struct dsa_switch *ds, int sw_index,
 578                                          int port, struct net_device *br);
 579         void    (*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
 580                                           int port, struct net_device *br);
 581
 582         /*
 583          * PTP functionality
 584          */
 585         int     (*port_hwtstamp_get)(struct dsa_switch *ds, int port,
 586                                      struct ifreq *ifr);
 587         int     (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
 588                                      struct ifreq *ifr);
 589         bool    (*port_txtstamp)(struct dsa_switch *ds, int port,
 590                                  struct sk_buff *clone, unsigned int type);
 591         bool    (*port_rxtstamp)(struct dsa_switch *ds, int port,
 592                                  struct sk_buff *skb, unsigned int type);
 593
 594         /* Devlink parameters */
 595         int     (*devlink_param_get)(struct dsa_switch *ds, u32 id,
 596                                      struct devlink_param_gset_ctx *ctx);
 597         int     (*devlink_param_set)(struct dsa_switch *ds, u32 id,
 598                                      struct devlink_param_gset_ctx *ctx);
 599
 600         /*
 601          * MTU change functionality. Switches can also adjust their MRU through
 602          * this method. By MTU, one understands the SDU (L2 payload) length.
 603          * If the switch needs to account for the DSA tag on the CPU port, this
 604          * method needs to to do so privately.
 605          */
 606         int     (*port_change_mtu)(struct dsa_switch *ds, int port,
 607                                    int new_mtu);
 608         int     (*port_max_mtu)(struct dsa_switch *ds, int port);
 609 };
 610
 611 #define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes)            \
 612         DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes,                \
 613                              dsa_devlink_param_get, dsa_devlink_param_set, NULL)
 614
 615 int dsa_devlink_param_get(struct devlink *dl, u32 id,
 616                           struct devlink_param_gset_ctx *ctx);
 617 int dsa_devlink_param_set(struct devlink *dl, u32 id,
 618                           struct devlink_param_gset_ctx *ctx);
 619 int dsa_devlink_params_register(struct dsa_switch *ds,
 620                                 const struct devlink_param *params,
 621                                 size_t params_count);
 622 void dsa_devlink_params_unregister(struct dsa_switch *ds,
 623                                    const struct devlink_param *params,
 624                                    size_t params_count);
 625 int dsa_devlink_resource_register(struct dsa_switch *ds,
 626                                   const char *resource_name,
 627                                   u64 resource_size,
 628                                   u64 resource_id,
 629                                   u64 parent_resource_id,
 630                                   const struct devlink_resource_size_params *size_params);
 631
 632 void dsa_devlink_resources_unregister(struct dsa_switch *ds);
 633
 634 void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
 635                                            u64 resource_id,
 636                                            devlink_resource_occ_get_t *occ_get,
 637                                            void *occ_get_priv);
 638 void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
 639                                              u64 resource_id);
 640
 641 struct dsa_devlink_priv {
 642         struct dsa_switch *ds;
 643 };
 644
 645 struct dsa_switch_driver {
 646         struct list_head        list;
 647         const struct dsa_switch_ops *ops;
 648 };
 649
 650 struct net_device *dsa_dev_to_net_device(struct device *dev);
 651
 652 /* Keep inline for faster access in hot path */
 653 static inline bool netdev_uses_dsa(struct net_device *dev)
 654 {
 655 #if IS_ENABLED(CONFIG_NET_DSA)
 656         return dev->dsa_ptr && dev->dsa_ptr->rcv;
 657 #endif
 658         return false;
 659 }
 660
 661 static inline bool dsa_can_decode(const struct sk_buff *skb,
 662                                   struct net_device *dev)
 663 {
 664 #if IS_ENABLED(CONFIG_NET_DSA)
 665         return !dev->dsa_ptr->filter || dev->dsa_ptr->filter(skb, dev);
 666 #endif
 667         return false;
 668 }
 669
 670 void dsa_unregister_switch(struct dsa_switch *ds);
 671 int dsa_register_switch(struct dsa_switch *ds);
 672 #ifdef CONFIG_PM_SLEEP
 673 int dsa_switch_suspend(struct dsa_switch *ds);
 674 int dsa_switch_resume(struct dsa_switch *ds);
 675 #else
 676 static inline int dsa_switch_suspend(struct dsa_switch *ds)
 677 {
 678         return 0;
 679 }
 680 static inline int dsa_switch_resume(struct dsa_switch *ds)
 681 {
 682         return 0;
 683 }
 684 #endif /* CONFIG_PM_SLEEP */
 685
 686 enum dsa_notifier_type {
 687         DSA_PORT_REGISTER,
 688         DSA_PORT_UNREGISTER,
 689 };
 690
 691 struct dsa_notifier_info {
 692         struct net_device *dev;
 693 };
 694
 695 struct dsa_notifier_register_info {
 696         struct dsa_notifier_info info;  /* must be first */
 697         struct net_device *master;
 698         unsigned int port_number;
 699         unsigned int switch_number;
 700 };
 701
 702 static inline struct net_device *
 703 dsa_notifier_info_to_dev(const struct dsa_notifier_info *info)
 704 {
 705         return info->dev;
 706 }
 707
 708 #if IS_ENABLED(CONFIG_NET_DSA)
 709 int register_dsa_notifier(struct notifier_block *nb);
 710 int unregister_dsa_notifier(struct notifier_block *nb);
 711 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 712                        struct dsa_notifier_info *info);
 713 #else
 714 static inline int register_dsa_notifier(struct notifier_block *nb)
 715 {
 716         return 0;
 717 }
 718
 719 static inline int unregister_dsa_notifier(struct notifier_block *nb)
 720 {
 721         return 0;
 722 }
 723
 724 static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 725                                      struct dsa_notifier_info *info)
 726 {
 727         return NOTIFY_DONE;
 728 }
 729 #endif
 730
 731 /* Broadcom tag specific helpers to insert and extract queue/port number */
 732 #define BRCM_TAG_SET_PORT_QUEUE(p, q)   ((p) << 8 | q)
 733 #define BRCM_TAG_GET_PORT(v)            ((v) >> 8)
 734 #define BRCM_TAG_GET_QUEUE(v)           ((v) & 0xff)
 735
 736
 737 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
 738 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
 739 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
 740 int dsa_port_get_phy_sset_count(struct dsa_port *dp);
 741 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
 742
 743 struct dsa_tag_driver {
 744         const struct dsa_device_ops *ops;
 745         struct list_head list;
 746         struct module *owner;
 747 };
 748
 749 void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
 750                               unsigned int count,
 751                               struct module *owner);
 752 void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
 753                                 unsigned int count);
 754
 755 #define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count) \
 756 static int __init dsa_tag_driver_module_init(void)                      \
 757 {                                                                       \
 758         dsa_tag_drivers_register(__dsa_tag_drivers_array, __count,      \
 759                                  THIS_MODULE);                          \
 760         return 0;                                                       \
 761 }                                                                       \
 762 module_init(dsa_tag_driver_module_init);                                \
 763                                                                         \
 764 static void __exit dsa_tag_driver_module_exit(void)                     \
 765 {                                                                       \
 766         dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count);   \
 767 }                                                                       \
 768 module_exit(dsa_tag_driver_module_exit)
 769
 770 /**
 771  * module_dsa_tag_drivers() - Helper macro for registering DSA tag
 772  * drivers
 773  * @__ops_array: Array of tag driver strucutres
 774  *
 775  * Helper macro for DSA tag drivers which do not do anything special
 776  * in module init/exit. Each module may only use this macro once, and
 777  * calling it replaces module_init() and module_exit().
 778  */
 779 #define module_dsa_tag_drivers(__ops_array)                             \
 780 dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
 781
 782 #define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
 783
 784 /* Create a static structure we can build a linked list of dsa_tag
 785  * drivers
 786  */
 787 #define DSA_TAG_DRIVER(__ops)                                           \
 788 static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = {             \
 789         .ops = &__ops,                                                  \
 790 }
 791
 792 /**
 793  * module_dsa_tag_driver() - Helper macro for registering a single DSA tag
 794  * driver
 795  * @__ops: Single tag driver structures
 796  *
 797  * Helper macro for DSA tag drivers which do not do anything special
 798  * in module init/exit. Each module may only use this macro once, and
 799  * calling it replaces module_init() and module_exit().
 800  */
 801 #define module_dsa_tag_driver(__ops)                                    \
 802 DSA_TAG_DRIVER(__ops);                                                  \
 803                                                                         \
 804 static struct dsa_tag_driver *dsa_tag_driver_array[] =  {               \
 805         &DSA_TAG_DRIVER_NAME(__ops)                                     \
 806 };                                                                      \
 807 module_dsa_tag_drivers(dsa_tag_driver_array)
 808 #endif
 809