net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   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 #include <linux/list.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <linux/mdio.h>
  19 #include <linux/list.h>
  20 #include <net/rtnetlink.h>
  21 #include <net/pkt_cls.h>
  22 #include <net/tc_act/tc_mirred.h>
  23 #include <linux/if_bridge.h>
  24 #include <linux/netpoll.h>
  25
  26 #include "dsa_priv.h"
  27
  28 static bool dsa_slave_dev_check(struct net_device *dev);
  29
  30 static int dsa_port_notify(struct dsa_port *dp, unsigned long e, void *v)
  31 {
  32         struct raw_notifier_head *nh = &dp->ds->dst->nh;
  33         int err;
  34
  35         err = raw_notifier_call_chain(nh, e, v);
  36
  37         return notifier_to_errno(err);
  38 }
  39
  40 /* slave mii_bus handling ***************************************************/
  41 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  42 {
  43         struct dsa_switch *ds = bus->priv;
  44
  45         if (ds->phys_mii_mask & (1 << addr))
  46                 return ds->ops->phy_read(ds, addr, reg);
  47
  48         return 0xffff;
  49 }
  50
  51 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  52 {
  53         struct dsa_switch *ds = bus->priv;
  54
  55         if (ds->phys_mii_mask & (1 << addr))
  56                 return ds->ops->phy_write(ds, addr, reg, val);
  57
  58         return 0;
  59 }
  60
  61 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  62 {
  63         ds->slave_mii_bus->priv = (void *)ds;
  64         ds->slave_mii_bus->name = "dsa slave smi";
  65         ds->slave_mii_bus->read = dsa_slave_phy_read;
  66         ds->slave_mii_bus->write = dsa_slave_phy_write;
  67         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  68                  ds->dst->tree, ds->index);
  69         ds->slave_mii_bus->parent = ds->dev;
  70         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  71 }
  72
  73
  74 /* slave device handling ****************************************************/
  75 static int dsa_slave_get_iflink(const struct net_device *dev)
  76 {
  77         struct dsa_slave_priv *p = netdev_priv(dev);
  78
  79         return p->dp->ds->dst->master_netdev->ifindex;
  80 }
  81
  82 static inline bool dsa_port_is_bridged(struct dsa_port *dp)
  83 {
  84         return !!dp->bridge_dev;
  85 }
  86
  87 static int dsa_port_set_state(struct dsa_port *dp, u8 state,
  88                               struct switchdev_trans *trans)
  89 {
  90         struct dsa_switch *ds = dp->ds;
  91         int port = dp->index;
  92
  93         if (switchdev_trans_ph_prepare(trans))
  94                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
  95
  96         if (ds->ops->port_stp_state_set)
  97                 ds->ops->port_stp_state_set(ds, port, state);
  98
  99         if (ds->ops->port_fast_age) {
 100                 /* Fast age FDB entries or flush appropriate forwarding database
 101                  * for the given port, if we are moving it from Learning or
 102                  * Forwarding state, to Disabled or Blocking or Listening state.
 103                  */
 104
 105                 if ((dp->stp_state == BR_STATE_LEARNING ||
 106                      dp->stp_state == BR_STATE_FORWARDING) &&
 107                     (state == BR_STATE_DISABLED ||
 108                      state == BR_STATE_BLOCKING ||
 109                      state == BR_STATE_LISTENING))
 110                         ds->ops->port_fast_age(ds, port);
 111         }
 112
 113         dp->stp_state = state;
 114
 115         return 0;
 116 }
 117
 118 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
 119 {
 120         int err;
 121
 122         err = dsa_port_set_state(dp, state, NULL);
 123         if (err)
 124                 pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
 125 }
 126
 127 static int dsa_slave_open(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->dp->ds->dst->master_netdev;
 131         struct dsa_switch *ds = p->dp->ds;
 132         u8 stp_state = dsa_port_is_bridged(p->dp) ?
 133                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
 134         int err;
 135
 136         if (!(master->flags & IFF_UP))
 137                 return -ENETDOWN;
 138
 139         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
 140                 err = dev_uc_add(master, dev->dev_addr);
 141                 if (err < 0)
 142                         goto out;
 143         }
 144
 145         if (dev->flags & IFF_ALLMULTI) {
 146                 err = dev_set_allmulti(master, 1);
 147                 if (err < 0)
 148                         goto del_unicast;
 149         }
 150         if (dev->flags & IFF_PROMISC) {
 151                 err = dev_set_promiscuity(master, 1);
 152                 if (err < 0)
 153                         goto clear_allmulti;
 154         }
 155
 156         if (ds->ops->port_enable) {
 157                 err = ds->ops->port_enable(ds, p->dp->index, p->phy);
 158                 if (err)
 159                         goto clear_promisc;
 160         }
 161
 162         dsa_port_set_state_now(p->dp, stp_state);
 163
 164         if (p->phy)
 165                 phy_start(p->phy);
 166
 167         return 0;
 168
 169 clear_promisc:
 170         if (dev->flags & IFF_PROMISC)
 171                 dev_set_promiscuity(master, -1);
 172 clear_allmulti:
 173         if (dev->flags & IFF_ALLMULTI)
 174                 dev_set_allmulti(master, -1);
 175 del_unicast:
 176         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 177                 dev_uc_del(master, dev->dev_addr);
 178 out:
 179         return err;
 180 }
 181
 182 static int dsa_slave_close(struct net_device *dev)
 183 {
 184         struct dsa_slave_priv *p = netdev_priv(dev);
 185         struct net_device *master = p->dp->ds->dst->master_netdev;
 186         struct dsa_switch *ds = p->dp->ds;
 187
 188         if (p->phy)
 189                 phy_stop(p->phy);
 190
 191         dev_mc_unsync(master, dev);
 192         dev_uc_unsync(master, dev);
 193         if (dev->flags & IFF_ALLMULTI)
 194                 dev_set_allmulti(master, -1);
 195         if (dev->flags & IFF_PROMISC)
 196                 dev_set_promiscuity(master, -1);
 197
 198         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 199                 dev_uc_del(master, dev->dev_addr);
 200
 201         if (ds->ops->port_disable)
 202                 ds->ops->port_disable(ds, p->dp->index, p->phy);
 203
 204         dsa_port_set_state_now(p->dp, BR_STATE_DISABLED);
 205
 206         return 0;
 207 }
 208
 209 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 210 {
 211         struct dsa_slave_priv *p = netdev_priv(dev);
 212         struct net_device *master = p->dp->ds->dst->master_netdev;
 213
 214         if (change & IFF_ALLMULTI)
 215                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 216         if (change & IFF_PROMISC)
 217                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 218 }
 219
 220 static void dsa_slave_set_rx_mode(struct net_device *dev)
 221 {
 222         struct dsa_slave_priv *p = netdev_priv(dev);
 223         struct net_device *master = p->dp->ds->dst->master_netdev;
 224
 225         dev_mc_sync(master, dev);
 226         dev_uc_sync(master, dev);
 227 }
 228
 229 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 230 {
 231         struct dsa_slave_priv *p = netdev_priv(dev);
 232         struct net_device *master = p->dp->ds->dst->master_netdev;
 233         struct sockaddr *addr = a;
 234         int err;
 235
 236         if (!is_valid_ether_addr(addr->sa_data))
 237                 return -EADDRNOTAVAIL;
 238
 239         if (!(dev->flags & IFF_UP))
 240                 goto out;
 241
 242         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 243                 err = dev_uc_add(master, addr->sa_data);
 244                 if (err < 0)
 245                         return err;
 246         }
 247
 248         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 249                 dev_uc_del(master, dev->dev_addr);
 250
 251 out:
 252         ether_addr_copy(dev->dev_addr, addr->sa_data);
 253
 254         return 0;
 255 }
 256
 257 static int dsa_slave_port_vlan_add(struct net_device *dev,
 258                                    const struct switchdev_obj_port_vlan *vlan,
 259                                    struct switchdev_trans *trans)
 260 {
 261         struct dsa_slave_priv *p = netdev_priv(dev);
 262         struct dsa_port *dp = p->dp;
 263         struct dsa_switch *ds = dp->ds;
 264
 265         if (switchdev_trans_ph_prepare(trans)) {
 266                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 267                         return -EOPNOTSUPP;
 268
 269                 return ds->ops->port_vlan_prepare(ds, dp->index, vlan, trans);
 270         }
 271
 272         ds->ops->port_vlan_add(ds, dp->index, vlan, trans);
 273
 274         return 0;
 275 }
 276
 277 static int dsa_slave_port_vlan_del(struct net_device *dev,
 278                                    const struct switchdev_obj_port_vlan *vlan)
 279 {
 280         struct dsa_slave_priv *p = netdev_priv(dev);
 281         struct dsa_switch *ds = p->dp->ds;
 282
 283         if (!ds->ops->port_vlan_del)
 284                 return -EOPNOTSUPP;
 285
 286         return ds->ops->port_vlan_del(ds, p->dp->index, vlan);
 287 }
 288
 289 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 290                                     struct switchdev_obj_port_vlan *vlan,
 291                                     switchdev_obj_dump_cb_t *cb)
 292 {
 293         struct dsa_slave_priv *p = netdev_priv(dev);
 294         struct dsa_switch *ds = p->dp->ds;
 295
 296         if (ds->ops->port_vlan_dump)
 297                 return ds->ops->port_vlan_dump(ds, p->dp->index, vlan, cb);
 298
 299         return -EOPNOTSUPP;
 300 }
 301
 302 static int dsa_port_fdb_add(struct dsa_port *dp,
 303                             const struct switchdev_obj_port_fdb *fdb,
 304                             struct switchdev_trans *trans)
 305 {
 306         struct dsa_switch *ds = dp->ds;
 307
 308         if (switchdev_trans_ph_prepare(trans)) {
 309                 if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
 310                         return -EOPNOTSUPP;
 311
 312                 return ds->ops->port_fdb_prepare(ds, dp->index, fdb, trans);
 313         }
 314
 315         ds->ops->port_fdb_add(ds, dp->index, fdb, trans);
 316
 317         return 0;
 318 }
 319
 320 static int dsa_port_fdb_del(struct dsa_port *dp,
 321                             const struct switchdev_obj_port_fdb *fdb)
 322 {
 323         struct dsa_switch *ds = dp->ds;
 324         int ret = -EOPNOTSUPP;
 325
 326         if (ds->ops->port_fdb_del)
 327                 ret = ds->ops->port_fdb_del(ds, dp->index, fdb);
 328
 329         return ret;
 330 }
 331
 332 static int dsa_port_fdb_dump(struct dsa_port *dp,
 333                              struct switchdev_obj_port_fdb *fdb,
 334                              switchdev_obj_dump_cb_t *cb)
 335 {
 336         struct dsa_switch *ds = dp->ds;
 337
 338         if (ds->ops->port_fdb_dump)
 339                 return ds->ops->port_fdb_dump(ds, dp->index, fdb, cb);
 340
 341         return -EOPNOTSUPP;
 342 }
 343
 344 static int dsa_port_mdb_add(struct dsa_port *dp,
 345                             const struct switchdev_obj_port_mdb *mdb,
 346                             struct switchdev_trans *trans)
 347 {
 348         struct dsa_switch *ds = dp->ds;
 349
 350         if (switchdev_trans_ph_prepare(trans)) {
 351                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 352                         return -EOPNOTSUPP;
 353
 354                 return ds->ops->port_mdb_prepare(ds, dp->index, mdb, trans);
 355         }
 356
 357         ds->ops->port_mdb_add(ds, dp->index, mdb, trans);
 358
 359         return 0;
 360 }
 361
 362 static int dsa_port_mdb_del(struct dsa_port *dp,
 363                             const struct switchdev_obj_port_mdb *mdb)
 364 {
 365         struct dsa_switch *ds = dp->ds;
 366
 367         if (ds->ops->port_mdb_del)
 368                 return ds->ops->port_mdb_del(ds, dp->index, mdb);
 369
 370         return -EOPNOTSUPP;
 371 }
 372
 373 static int dsa_port_mdb_dump(struct dsa_port *dp,
 374                              struct switchdev_obj_port_mdb *mdb,
 375                              switchdev_obj_dump_cb_t *cb)
 376 {
 377         struct dsa_switch *ds = dp->ds;
 378
 379         if (ds->ops->port_mdb_dump)
 380                 return ds->ops->port_mdb_dump(ds, dp->index, mdb, cb);
 381
 382         return -EOPNOTSUPP;
 383 }
 384
 385 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 386 {
 387         struct dsa_slave_priv *p = netdev_priv(dev);
 388
 389         if (p->phy != NULL)
 390                 return phy_mii_ioctl(p->phy, ifr, cmd);
 391
 392         return -EOPNOTSUPP;
 393 }
 394
 395 static int dsa_slave_vlan_filtering(struct net_device *dev,
 396                                     const struct switchdev_attr *attr,
 397                                     struct switchdev_trans *trans)
 398 {
 399         struct dsa_slave_priv *p = netdev_priv(dev);
 400         struct dsa_switch *ds = p->dp->ds;
 401
 402         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 403         if (switchdev_trans_ph_prepare(trans))
 404                 return 0;
 405
 406         if (ds->ops->port_vlan_filtering)
 407                 return ds->ops->port_vlan_filtering(ds, p->dp->index,
 408                                                     attr->u.vlan_filtering);
 409
 410         return 0;
 411 }
 412
 413 static unsigned int dsa_fastest_ageing_time(struct dsa_switch *ds,
 414                                             unsigned int ageing_time)
 415 {
 416         int i;
 417
 418         for (i = 0; i < ds->num_ports; ++i) {
 419                 struct dsa_port *dp = &ds->ports[i];
 420
 421                 if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
 422                         ageing_time = dp->ageing_time;
 423         }
 424
 425         return ageing_time;
 426 }
 427
 428 static int dsa_slave_ageing_time(struct net_device *dev,
 429                                  const struct switchdev_attr *attr,
 430                                  struct switchdev_trans *trans)
 431 {
 432         struct dsa_slave_priv *p = netdev_priv(dev);
 433         struct dsa_switch *ds = p->dp->ds;
 434         unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
 435         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 436
 437         if (switchdev_trans_ph_prepare(trans)) {
 438                 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
 439                         return -ERANGE;
 440                 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
 441                         return -ERANGE;
 442                 return 0;
 443         }
 444
 445         /* Keep the fastest ageing time in case of multiple bridges */
 446         p->dp->ageing_time = ageing_time;
 447         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 448
 449         if (ds->ops->set_ageing_time)
 450                 return ds->ops->set_ageing_time(ds, ageing_time);
 451
 452         return 0;
 453 }
 454
 455 static int dsa_slave_port_attr_set(struct net_device *dev,
 456                                    const struct switchdev_attr *attr,
 457                                    struct switchdev_trans *trans)
 458 {
 459         struct dsa_slave_priv *p = netdev_priv(dev);
 460         struct dsa_port *dp = p->dp;
 461         int ret;
 462
 463         switch (attr->id) {
 464         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 465                 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
 466                 break;
 467         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 468                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 469                 break;
 470         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 471                 ret = dsa_slave_ageing_time(dev, attr, trans);
 472                 break;
 473         default:
 474                 ret = -EOPNOTSUPP;
 475                 break;
 476         }
 477
 478         return ret;
 479 }
 480
 481 static int dsa_slave_port_obj_add(struct net_device *dev,
 482                                   const struct switchdev_obj *obj,
 483                                   struct switchdev_trans *trans)
 484 {
 485         struct dsa_slave_priv *p = netdev_priv(dev);
 486         struct dsa_port *dp = p->dp;
 487         int err;
 488
 489         /* For the prepare phase, ensure the full set of changes is feasable in
 490          * one go in order to signal a failure properly. If an operation is not
 491          * supported, return -EOPNOTSUPP.
 492          */
 493
 494         switch (obj->id) {
 495         case SWITCHDEV_OBJ_ID_PORT_FDB:
 496                 err = dsa_port_fdb_add(dp, SWITCHDEV_OBJ_PORT_FDB(obj), trans);
 497                 break;
 498         case SWITCHDEV_OBJ_ID_PORT_MDB:
 499                 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
 500                 break;
 501         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 502                 err = dsa_slave_port_vlan_add(dev,
 503                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 504                                               trans);
 505                 break;
 506         default:
 507                 err = -EOPNOTSUPP;
 508                 break;
 509         }
 510
 511         return err;
 512 }
 513
 514 static int dsa_slave_port_obj_del(struct net_device *dev,
 515                                   const struct switchdev_obj *obj)
 516 {
 517         struct dsa_slave_priv *p = netdev_priv(dev);
 518         struct dsa_port *dp = p->dp;
 519         int err;
 520
 521         switch (obj->id) {
 522         case SWITCHDEV_OBJ_ID_PORT_FDB:
 523                 err = dsa_port_fdb_del(dp, SWITCHDEV_OBJ_PORT_FDB(obj));
 524                 break;
 525         case SWITCHDEV_OBJ_ID_PORT_MDB:
 526                 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 527                 break;
 528         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 529                 err = dsa_slave_port_vlan_del(dev,
 530                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 531                 break;
 532         default:
 533                 err = -EOPNOTSUPP;
 534                 break;
 535         }
 536
 537         return err;
 538 }
 539
 540 static int dsa_slave_port_obj_dump(struct net_device *dev,
 541                                    struct switchdev_obj *obj,
 542                                    switchdev_obj_dump_cb_t *cb)
 543 {
 544         struct dsa_slave_priv *p = netdev_priv(dev);
 545         struct dsa_port *dp = p->dp;
 546         int err;
 547
 548         switch (obj->id) {
 549         case SWITCHDEV_OBJ_ID_PORT_FDB:
 550                 err = dsa_port_fdb_dump(dp, SWITCHDEV_OBJ_PORT_FDB(obj), cb);
 551                 break;
 552         case SWITCHDEV_OBJ_ID_PORT_MDB:
 553                 err = dsa_port_mdb_dump(dp, SWITCHDEV_OBJ_PORT_MDB(obj), cb);
 554                 break;
 555         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 556                 err = dsa_slave_port_vlan_dump(dev,
 557                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 558                                                cb);
 559                 break;
 560         default:
 561                 err = -EOPNOTSUPP;
 562                 break;
 563         }
 564
 565         return err;
 566 }
 567
 568 static int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
 569 {
 570         struct dsa_notifier_bridge_info info = {
 571                 .sw_index = dp->ds->index,
 572                 .port = dp->index,
 573                 .br = br,
 574         };
 575         int err;
 576
 577         /* Here the port is already bridged. Reflect the current configuration
 578          * so that drivers can program their chips accordingly.
 579          */
 580         dp->bridge_dev = br;
 581
 582         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
 583
 584         /* The bridging is rolled back on error */
 585         if (err)
 586                 dp->bridge_dev = NULL;
 587
 588         return err;
 589 }
 590
 591 static void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 592 {
 593         struct dsa_notifier_bridge_info info = {
 594                 .sw_index = dp->ds->index,
 595                 .port = dp->index,
 596                 .br = br,
 597         };
 598         int err;
 599
 600         /* Here the port is already unbridged. Reflect the current configuration
 601          * so that drivers can program their chips accordingly.
 602          */
 603         dp->bridge_dev = NULL;
 604
 605         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 606         if (err)
 607                 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
 608
 609         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 610          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 611          */
 612         dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 613 }
 614
 615 static int dsa_slave_port_attr_get(struct net_device *dev,
 616                                    struct switchdev_attr *attr)
 617 {
 618         struct dsa_slave_priv *p = netdev_priv(dev);
 619         struct dsa_switch *ds = p->dp->ds;
 620
 621         switch (attr->id) {
 622         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 623                 attr->u.ppid.id_len = sizeof(ds->index);
 624                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 625                 break;
 626         default:
 627                 return -EOPNOTSUPP;
 628         }
 629
 630         return 0;
 631 }
 632
 633 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 634                                                struct sk_buff *skb)
 635 {
 636 #ifdef CONFIG_NET_POLL_CONTROLLER
 637         if (p->netpoll)
 638                 netpoll_send_skb(p->netpoll, skb);
 639 #else
 640         BUG();
 641 #endif
 642         return NETDEV_TX_OK;
 643 }
 644
 645 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 646 {
 647         struct dsa_slave_priv *p = netdev_priv(dev);
 648         struct sk_buff *nskb;
 649
 650         dev->stats.tx_packets++;
 651         dev->stats.tx_bytes += skb->len;
 652
 653         /* Transmit function may have to reallocate the original SKB */
 654         nskb = p->xmit(skb, dev);
 655         if (!nskb)
 656                 return NETDEV_TX_OK;
 657
 658         /* SKB for netpoll still need to be mangled with the protocol-specific
 659          * tag to be successfully transmitted
 660          */
 661         if (unlikely(netpoll_tx_running(dev)))
 662                 return dsa_netpoll_send_skb(p, nskb);
 663
 664         /* Queue the SKB for transmission on the parent interface, but
 665          * do not modify its EtherType
 666          */
 667         nskb->dev = p->dp->ds->dst->master_netdev;
 668         dev_queue_xmit(nskb);
 669
 670         return NETDEV_TX_OK;
 671 }
 672
 673 /* ethtool operations *******************************************************/
 674 static int
 675 dsa_slave_get_link_ksettings(struct net_device *dev,
 676                              struct ethtool_link_ksettings *cmd)
 677 {
 678         struct dsa_slave_priv *p = netdev_priv(dev);
 679         int err = -EOPNOTSUPP;
 680
 681         if (p->phy != NULL)
 682                 err = phy_ethtool_ksettings_get(p->phy, cmd);
 683
 684         return err;
 685 }
 686
 687 static int
 688 dsa_slave_set_link_ksettings(struct net_device *dev,
 689                              const struct ethtool_link_ksettings *cmd)
 690 {
 691         struct dsa_slave_priv *p = netdev_priv(dev);
 692
 693         if (p->phy != NULL)
 694                 return phy_ethtool_ksettings_set(p->phy, cmd);
 695
 696         return -EOPNOTSUPP;
 697 }
 698
 699 static void dsa_slave_get_drvinfo(struct net_device *dev,
 700                                   struct ethtool_drvinfo *drvinfo)
 701 {
 702         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 703         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 704         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 705 }
 706
 707 static int dsa_slave_get_regs_len(struct net_device *dev)
 708 {
 709         struct dsa_slave_priv *p = netdev_priv(dev);
 710         struct dsa_switch *ds = p->dp->ds;
 711
 712         if (ds->ops->get_regs_len)
 713                 return ds->ops->get_regs_len(ds, p->dp->index);
 714
 715         return -EOPNOTSUPP;
 716 }
 717
 718 static void
 719 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 720 {
 721         struct dsa_slave_priv *p = netdev_priv(dev);
 722         struct dsa_switch *ds = p->dp->ds;
 723
 724         if (ds->ops->get_regs)
 725                 ds->ops->get_regs(ds, p->dp->index, regs, _p);
 726 }
 727
 728 static int dsa_slave_nway_reset(struct net_device *dev)
 729 {
 730         struct dsa_slave_priv *p = netdev_priv(dev);
 731
 732         if (p->phy != NULL)
 733                 return genphy_restart_aneg(p->phy);
 734
 735         return -EOPNOTSUPP;
 736 }
 737
 738 static u32 dsa_slave_get_link(struct net_device *dev)
 739 {
 740         struct dsa_slave_priv *p = netdev_priv(dev);
 741
 742         if (p->phy != NULL) {
 743                 genphy_update_link(p->phy);
 744                 return p->phy->link;
 745         }
 746
 747         return -EOPNOTSUPP;
 748 }
 749
 750 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 751 {
 752         struct dsa_slave_priv *p = netdev_priv(dev);
 753         struct dsa_switch *ds = p->dp->ds;
 754
 755         if (ds->cd && ds->cd->eeprom_len)
 756                 return ds->cd->eeprom_len;
 757
 758         if (ds->ops->get_eeprom_len)
 759                 return ds->ops->get_eeprom_len(ds);
 760
 761         return 0;
 762 }
 763
 764 static int dsa_slave_get_eeprom(struct net_device *dev,
 765                                 struct ethtool_eeprom *eeprom, u8 *data)
 766 {
 767         struct dsa_slave_priv *p = netdev_priv(dev);
 768         struct dsa_switch *ds = p->dp->ds;
 769
 770         if (ds->ops->get_eeprom)
 771                 return ds->ops->get_eeprom(ds, eeprom, data);
 772
 773         return -EOPNOTSUPP;
 774 }
 775
 776 static int dsa_slave_set_eeprom(struct net_device *dev,
 777                                 struct ethtool_eeprom *eeprom, u8 *data)
 778 {
 779         struct dsa_slave_priv *p = netdev_priv(dev);
 780         struct dsa_switch *ds = p->dp->ds;
 781
 782         if (ds->ops->set_eeprom)
 783                 return ds->ops->set_eeprom(ds, eeprom, data);
 784
 785         return -EOPNOTSUPP;
 786 }
 787
 788 static void dsa_slave_get_strings(struct net_device *dev,
 789                                   uint32_t stringset, uint8_t *data)
 790 {
 791         struct dsa_slave_priv *p = netdev_priv(dev);
 792         struct dsa_switch *ds = p->dp->ds;
 793
 794         if (stringset == ETH_SS_STATS) {
 795                 int len = ETH_GSTRING_LEN;
 796
 797                 strncpy(data, "tx_packets", len);
 798                 strncpy(data + len, "tx_bytes", len);
 799                 strncpy(data + 2 * len, "rx_packets", len);
 800                 strncpy(data + 3 * len, "rx_bytes", len);
 801                 if (ds->ops->get_strings)
 802                         ds->ops->get_strings(ds, p->dp->index, data + 4 * len);
 803         }
 804 }
 805
 806 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 807                                            struct ethtool_stats *stats,
 808                                            uint64_t *data)
 809 {
 810         struct dsa_switch_tree *dst = dev->dsa_ptr;
 811         struct dsa_switch *ds = dst->cpu_dp->ds;
 812         s8 cpu_port = dst->cpu_dp->index;
 813         int count = 0;
 814
 815         if (dst->master_ethtool_ops.get_sset_count) {
 816                 count = dst->master_ethtool_ops.get_sset_count(dev,
 817                                                                ETH_SS_STATS);
 818                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 819         }
 820
 821         if (ds->ops->get_ethtool_stats)
 822                 ds->ops->get_ethtool_stats(ds, cpu_port, data + count);
 823 }
 824
 825 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 826 {
 827         struct dsa_switch_tree *dst = dev->dsa_ptr;
 828         struct dsa_switch *ds = dst->cpu_dp->ds;
 829         int count = 0;
 830
 831         if (dst->master_ethtool_ops.get_sset_count)
 832                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 833
 834         if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 835                 count += ds->ops->get_sset_count(ds);
 836
 837         return count;
 838 }
 839
 840 static void dsa_cpu_port_get_strings(struct net_device *dev,
 841                                      uint32_t stringset, uint8_t *data)
 842 {
 843         struct dsa_switch_tree *dst = dev->dsa_ptr;
 844         struct dsa_switch *ds = dst->cpu_dp->ds;
 845         s8 cpu_port = dst->cpu_dp->index;
 846         int len = ETH_GSTRING_LEN;
 847         int mcount = 0, count;
 848         unsigned int i;
 849         uint8_t pfx[4];
 850         uint8_t *ndata;
 851
 852         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 853         /* We do not want to be NULL-terminated, since this is a prefix */
 854         pfx[sizeof(pfx) - 1] = '_';
 855
 856         if (dst->master_ethtool_ops.get_sset_count) {
 857                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 858                                                                 ETH_SS_STATS);
 859                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 860         }
 861
 862         if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
 863                 ndata = data + mcount * len;
 864                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 865                  * the output after to prepend our CPU port prefix we
 866                  * constructed earlier
 867                  */
 868                 ds->ops->get_strings(ds, cpu_port, ndata);
 869                 count = ds->ops->get_sset_count(ds);
 870                 for (i = 0; i < count; i++) {
 871                         memmove(ndata + (i * len + sizeof(pfx)),
 872                                 ndata + i * len, len - sizeof(pfx));
 873                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 874                 }
 875         }
 876 }
 877
 878 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 879                                         struct ethtool_stats *stats,
 880                                         uint64_t *data)
 881 {
 882         struct dsa_slave_priv *p = netdev_priv(dev);
 883         struct dsa_switch *ds = p->dp->ds;
 884
 885         data[0] = dev->stats.tx_packets;
 886         data[1] = dev->stats.tx_bytes;
 887         data[2] = dev->stats.rx_packets;
 888         data[3] = dev->stats.rx_bytes;
 889         if (ds->ops->get_ethtool_stats)
 890                 ds->ops->get_ethtool_stats(ds, p->dp->index, data + 4);
 891 }
 892
 893 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 894 {
 895         struct dsa_slave_priv *p = netdev_priv(dev);
 896         struct dsa_switch *ds = p->dp->ds;
 897
 898         if (sset == ETH_SS_STATS) {
 899                 int count;
 900
 901                 count = 4;
 902                 if (ds->ops->get_sset_count)
 903                         count += ds->ops->get_sset_count(ds);
 904
 905                 return count;
 906         }
 907
 908         return -EOPNOTSUPP;
 909 }
 910
 911 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 912 {
 913         struct dsa_slave_priv *p = netdev_priv(dev);
 914         struct dsa_switch *ds = p->dp->ds;
 915
 916         if (ds->ops->get_wol)
 917                 ds->ops->get_wol(ds, p->dp->index, w);
 918 }
 919
 920 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 921 {
 922         struct dsa_slave_priv *p = netdev_priv(dev);
 923         struct dsa_switch *ds = p->dp->ds;
 924         int ret = -EOPNOTSUPP;
 925
 926         if (ds->ops->set_wol)
 927                 ret = ds->ops->set_wol(ds, p->dp->index, w);
 928
 929         return ret;
 930 }
 931
 932 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 933 {
 934         struct dsa_slave_priv *p = netdev_priv(dev);
 935         struct dsa_switch *ds = p->dp->ds;
 936         int ret;
 937
 938         if (!ds->ops->set_eee)
 939                 return -EOPNOTSUPP;
 940
 941         ret = ds->ops->set_eee(ds, p->dp->index, p->phy, e);
 942         if (ret)
 943                 return ret;
 944
 945         if (p->phy)
 946                 ret = phy_ethtool_set_eee(p->phy, e);
 947
 948         return ret;
 949 }
 950
 951 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 952 {
 953         struct dsa_slave_priv *p = netdev_priv(dev);
 954         struct dsa_switch *ds = p->dp->ds;
 955         int ret;
 956
 957         if (!ds->ops->get_eee)
 958                 return -EOPNOTSUPP;
 959
 960         ret = ds->ops->get_eee(ds, p->dp->index, e);
 961         if (ret)
 962                 return ret;
 963
 964         if (p->phy)
 965                 ret = phy_ethtool_get_eee(p->phy, e);
 966
 967         return ret;
 968 }
 969
 970 #ifdef CONFIG_NET_POLL_CONTROLLER
 971 static int dsa_slave_netpoll_setup(struct net_device *dev,
 972                                    struct netpoll_info *ni)
 973 {
 974         struct dsa_slave_priv *p = netdev_priv(dev);
 975         struct dsa_switch *ds = p->dp->ds;
 976         struct net_device *master = ds->dst->master_netdev;
 977         struct netpoll *netpoll;
 978         int err = 0;
 979
 980         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 981         if (!netpoll)
 982                 return -ENOMEM;
 983
 984         err = __netpoll_setup(netpoll, master);
 985         if (err) {
 986                 kfree(netpoll);
 987                 goto out;
 988         }
 989
 990         p->netpoll = netpoll;
 991 out:
 992         return err;
 993 }
 994
 995 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 996 {
 997         struct dsa_slave_priv *p = netdev_priv(dev);
 998         struct netpoll *netpoll = p->netpoll;
 999
1000         if (!netpoll)
1001                 return;
1002
1003         p->netpoll = NULL;
1004
1005         __netpoll_free_async(netpoll);
1006 }
1007
1008 static void dsa_slave_poll_controller(struct net_device *dev)
1009 {
1010 }
1011 #endif
1012
1013 static int dsa_slave_get_phys_port_name(struct net_device *dev,
1014                                         char *name, size_t len)
1015 {
1016         struct dsa_slave_priv *p = netdev_priv(dev);
1017
1018         if (snprintf(name, len, "p%d", p->dp->index) >= len)
1019                 return -EINVAL;
1020
1021         return 0;
1022 }
1023
1024 static struct dsa_mall_tc_entry *
1025 dsa_slave_mall_tc_entry_find(struct dsa_slave_priv *p,
1026                              unsigned long cookie)
1027 {
1028         struct dsa_mall_tc_entry *mall_tc_entry;
1029
1030         list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1031                 if (mall_tc_entry->cookie == cookie)
1032                         return mall_tc_entry;
1033
1034         return NULL;
1035 }
1036
1037 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1038                                       __be16 protocol,
1039                                       struct tc_cls_matchall_offload *cls,
1040                                       bool ingress)
1041 {
1042         struct dsa_slave_priv *p = netdev_priv(dev);
1043         struct dsa_mall_tc_entry *mall_tc_entry;
1044         struct dsa_switch *ds = p->dp->ds;
1045         struct net *net = dev_net(dev);
1046         struct dsa_slave_priv *to_p;
1047         struct net_device *to_dev;
1048         const struct tc_action *a;
1049         int err = -EOPNOTSUPP;
1050         LIST_HEAD(actions);
1051         int ifindex;
1052
1053         if (!ds->ops->port_mirror_add)
1054                 return err;
1055
1056         if (!tc_single_action(cls->exts))
1057                 return err;
1058
1059         tcf_exts_to_list(cls->exts, &actions);
1060         a = list_first_entry(&actions, struct tc_action, list);
1061
1062         if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
1063                 struct dsa_mall_mirror_tc_entry *mirror;
1064
1065                 ifindex = tcf_mirred_ifindex(a);
1066                 to_dev = __dev_get_by_index(net, ifindex);
1067                 if (!to_dev)
1068                         return -EINVAL;
1069
1070                 if (!dsa_slave_dev_check(to_dev))
1071                         return -EOPNOTSUPP;
1072
1073                 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1074                 if (!mall_tc_entry)
1075                         return -ENOMEM;
1076
1077                 mall_tc_entry->cookie = cls->cookie;
1078                 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1079                 mirror = &mall_tc_entry->mirror;
1080
1081                 to_p = netdev_priv(to_dev);
1082
1083                 mirror->to_local_port = to_p->dp->index;
1084                 mirror->ingress = ingress;
1085
1086                 err = ds->ops->port_mirror_add(ds, p->dp->index, mirror,
1087                                                ingress);
1088                 if (err) {
1089                         kfree(mall_tc_entry);
1090                         return err;
1091                 }
1092
1093                 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1094         }
1095
1096         return 0;
1097 }
1098
1099 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1100                                        struct tc_cls_matchall_offload *cls)
1101 {
1102         struct dsa_slave_priv *p = netdev_priv(dev);
1103         struct dsa_mall_tc_entry *mall_tc_entry;
1104         struct dsa_switch *ds = p->dp->ds;
1105
1106         if (!ds->ops->port_mirror_del)
1107                 return;
1108
1109         mall_tc_entry = dsa_slave_mall_tc_entry_find(p, cls->cookie);
1110         if (!mall_tc_entry)
1111                 return;
1112
1113         list_del(&mall_tc_entry->list);
1114
1115         switch (mall_tc_entry->type) {
1116         case DSA_PORT_MALL_MIRROR:
1117                 ds->ops->port_mirror_del(ds, p->dp->index,
1118                                          &mall_tc_entry->mirror);
1119                 break;
1120         default:
1121                 WARN_ON(1);
1122         }
1123
1124         kfree(mall_tc_entry);
1125 }
1126
1127 static int dsa_slave_setup_tc(struct net_device *dev, u32 handle,
1128                               __be16 protocol, struct tc_to_netdev *tc)
1129 {
1130         bool ingress = TC_H_MAJ(handle) == TC_H_MAJ(TC_H_INGRESS);
1131         int ret = -EOPNOTSUPP;
1132
1133         switch (tc->type) {
1134         case TC_SETUP_MATCHALL:
1135                 switch (tc->cls_mall->command) {
1136                 case TC_CLSMATCHALL_REPLACE:
1137                         return dsa_slave_add_cls_matchall(dev, protocol,
1138                                                           tc->cls_mall,
1139                                                           ingress);
1140                 case TC_CLSMATCHALL_DESTROY:
1141                         dsa_slave_del_cls_matchall(dev, tc->cls_mall);
1142                         return 0;
1143                 }
1144         default:
1145                 break;
1146         }
1147
1148         return ret;
1149 }
1150
1151 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
1152 {
1153         ops->get_sset_count = dsa_cpu_port_get_sset_count;
1154         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
1155         ops->get_strings = dsa_cpu_port_get_strings;
1156 }
1157
1158 static int dsa_slave_get_rxnfc(struct net_device *dev,
1159                                struct ethtool_rxnfc *nfc, u32 *rule_locs)
1160 {
1161         struct dsa_slave_priv *p = netdev_priv(dev);
1162         struct dsa_switch *ds = p->dp->ds;
1163
1164         if (!ds->ops->get_rxnfc)
1165                 return -EOPNOTSUPP;
1166
1167         return ds->ops->get_rxnfc(ds, p->dp->index, nfc, rule_locs);
1168 }
1169
1170 static int dsa_slave_set_rxnfc(struct net_device *dev,
1171                                struct ethtool_rxnfc *nfc)
1172 {
1173         struct dsa_slave_priv *p = netdev_priv(dev);
1174         struct dsa_switch *ds = p->dp->ds;
1175
1176         if (!ds->ops->set_rxnfc)
1177                 return -EOPNOTSUPP;
1178
1179         return ds->ops->set_rxnfc(ds, p->dp->index, nfc);
1180 }
1181
1182 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1183         .get_drvinfo            = dsa_slave_get_drvinfo,
1184         .get_regs_len           = dsa_slave_get_regs_len,
1185         .get_regs               = dsa_slave_get_regs,
1186         .nway_reset             = dsa_slave_nway_reset,
1187         .get_link               = dsa_slave_get_link,
1188         .get_eeprom_len         = dsa_slave_get_eeprom_len,
1189         .get_eeprom             = dsa_slave_get_eeprom,
1190         .set_eeprom             = dsa_slave_set_eeprom,
1191         .get_strings            = dsa_slave_get_strings,
1192         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
1193         .get_sset_count         = dsa_slave_get_sset_count,
1194         .set_wol                = dsa_slave_set_wol,
1195         .get_wol                = dsa_slave_get_wol,
1196         .set_eee                = dsa_slave_set_eee,
1197         .get_eee                = dsa_slave_get_eee,
1198         .get_link_ksettings     = dsa_slave_get_link_ksettings,
1199         .set_link_ksettings     = dsa_slave_set_link_ksettings,
1200         .get_rxnfc              = dsa_slave_get_rxnfc,
1201         .set_rxnfc              = dsa_slave_set_rxnfc,
1202 };
1203
1204 static const struct net_device_ops dsa_slave_netdev_ops = {
1205         .ndo_open               = dsa_slave_open,
1206         .ndo_stop               = dsa_slave_close,
1207         .ndo_start_xmit         = dsa_slave_xmit,
1208         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
1209         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
1210         .ndo_set_mac_address    = dsa_slave_set_mac_address,
1211         .ndo_fdb_add            = switchdev_port_fdb_add,
1212         .ndo_fdb_del            = switchdev_port_fdb_del,
1213         .ndo_fdb_dump           = switchdev_port_fdb_dump,
1214         .ndo_do_ioctl           = dsa_slave_ioctl,
1215         .ndo_get_iflink         = dsa_slave_get_iflink,
1216 #ifdef CONFIG_NET_POLL_CONTROLLER
1217         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
1218         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
1219         .ndo_poll_controller    = dsa_slave_poll_controller,
1220 #endif
1221         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
1222         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
1223         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
1224         .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1225         .ndo_setup_tc           = dsa_slave_setup_tc,
1226 };
1227
1228 static const struct switchdev_ops dsa_slave_switchdev_ops = {
1229         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
1230         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
1231         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
1232         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
1233         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
1234 };
1235
1236 static struct device_type dsa_type = {
1237         .name   = "dsa",
1238 };
1239
1240 static void dsa_slave_adjust_link(struct net_device *dev)
1241 {
1242         struct dsa_slave_priv *p = netdev_priv(dev);
1243         struct dsa_switch *ds = p->dp->ds;
1244         unsigned int status_changed = 0;
1245
1246         if (p->old_link != p->phy->link) {
1247                 status_changed = 1;
1248                 p->old_link = p->phy->link;
1249         }
1250
1251         if (p->old_duplex != p->phy->duplex) {
1252                 status_changed = 1;
1253                 p->old_duplex = p->phy->duplex;
1254         }
1255
1256         if (p->old_pause != p->phy->pause) {
1257                 status_changed = 1;
1258                 p->old_pause = p->phy->pause;
1259         }
1260
1261         if (ds->ops->adjust_link && status_changed)
1262                 ds->ops->adjust_link(ds, p->dp->index, p->phy);
1263
1264         if (status_changed)
1265                 phy_print_status(p->phy);
1266 }
1267
1268 static int dsa_slave_fixed_link_update(struct net_device *dev,
1269                                        struct fixed_phy_status *status)
1270 {
1271         struct dsa_slave_priv *p;
1272         struct dsa_switch *ds;
1273
1274         if (dev) {
1275                 p = netdev_priv(dev);
1276                 ds = p->dp->ds;
1277                 if (ds->ops->fixed_link_update)
1278                         ds->ops->fixed_link_update(ds, p->dp->index, status);
1279         }
1280
1281         return 0;
1282 }
1283
1284 /* slave device setup *******************************************************/
1285 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1286                                  struct net_device *slave_dev,
1287                                  int addr)
1288 {
1289         struct dsa_switch *ds = p->dp->ds;
1290
1291         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1292         if (!p->phy) {
1293                 netdev_err(slave_dev, "no phy at %d\n", addr);
1294                 return -ENODEV;
1295         }
1296
1297         /* Use already configured phy mode */
1298         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1299                 p->phy_interface = p->phy->interface;
1300         return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1301                                   p->phy_interface);
1302 }
1303
1304 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1305                                 struct net_device *slave_dev)
1306 {
1307         struct dsa_switch *ds = p->dp->ds;
1308         struct device_node *phy_dn, *port_dn;
1309         bool phy_is_fixed = false;
1310         u32 phy_flags = 0;
1311         int mode, ret;
1312
1313         port_dn = p->dp->dn;
1314         mode = of_get_phy_mode(port_dn);
1315         if (mode < 0)
1316                 mode = PHY_INTERFACE_MODE_NA;
1317         p->phy_interface = mode;
1318
1319         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1320         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1321                 /* In the case of a fixed PHY, the DT node associated
1322                  * to the fixed PHY is the Port DT node
1323                  */
1324                 ret = of_phy_register_fixed_link(port_dn);
1325                 if (ret) {
1326                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1327                         return ret;
1328                 }
1329                 phy_is_fixed = true;
1330                 phy_dn = of_node_get(port_dn);
1331         }
1332
1333         if (ds->ops->get_phy_flags)
1334                 phy_flags = ds->ops->get_phy_flags(ds, p->dp->index);
1335
1336         if (phy_dn) {
1337                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1338
1339                 /* If this PHY address is part of phys_mii_mask, which means
1340                  * that we need to divert reads and writes to/from it, then we
1341                  * want to bind this device using the slave MII bus created by
1342                  * DSA to make that happen.
1343                  */
1344                 if (!phy_is_fixed && phy_id >= 0 &&
1345                     (ds->phys_mii_mask & (1 << phy_id))) {
1346                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1347                         if (ret) {
1348                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1349                                 of_node_put(phy_dn);
1350                                 return ret;
1351                         }
1352                 } else {
1353                         p->phy = of_phy_connect(slave_dev, phy_dn,
1354                                                 dsa_slave_adjust_link,
1355                                                 phy_flags,
1356                                                 p->phy_interface);
1357                 }
1358
1359                 of_node_put(phy_dn);
1360         }
1361
1362         if (p->phy && phy_is_fixed)
1363                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1364
1365         /* We could not connect to a designated PHY, so use the switch internal
1366          * MDIO bus instead
1367          */
1368         if (!p->phy) {
1369                 ret = dsa_slave_phy_connect(p, slave_dev, p->dp->index);
1370                 if (ret) {
1371                         netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1372                                    p->dp->index, ret);
1373                         if (phy_is_fixed)
1374                                 of_phy_deregister_fixed_link(port_dn);
1375                         return ret;
1376                 }
1377         }
1378
1379         phy_attached_info(p->phy);
1380
1381         return 0;
1382 }
1383
1384 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1385 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1386                                             struct netdev_queue *txq,
1387                                             void *_unused)
1388 {
1389         lockdep_set_class(&txq->_xmit_lock,
1390                           &dsa_slave_netdev_xmit_lock_key);
1391 }
1392
1393 int dsa_slave_suspend(struct net_device *slave_dev)
1394 {
1395         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1396
1397         netif_device_detach(slave_dev);
1398
1399         if (p->phy) {
1400                 phy_stop(p->phy);
1401                 p->old_pause = -1;
1402                 p->old_link = -1;
1403                 p->old_duplex = -1;
1404                 phy_suspend(p->phy);
1405         }
1406
1407         return 0;
1408 }
1409
1410 int dsa_slave_resume(struct net_device *slave_dev)
1411 {
1412         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1413
1414         netif_device_attach(slave_dev);
1415
1416         if (p->phy) {
1417                 phy_resume(p->phy);
1418                 phy_start(p->phy);
1419         }
1420
1421         return 0;
1422 }
1423
1424 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1425                      int port, const char *name)
1426 {
1427         struct dsa_switch_tree *dst = ds->dst;
1428         struct net_device *master;
1429         struct net_device *slave_dev;
1430         struct dsa_slave_priv *p;
1431         int ret;
1432
1433         master = ds->dst->master_netdev;
1434         if (ds->master_netdev)
1435                 master = ds->master_netdev;
1436
1437         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1438                                  NET_NAME_UNKNOWN, ether_setup);
1439         if (slave_dev == NULL)
1440                 return -ENOMEM;
1441
1442         slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1443         slave_dev->hw_features |= NETIF_F_HW_TC;
1444         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1445         eth_hw_addr_inherit(slave_dev, master);
1446         slave_dev->priv_flags |= IFF_NO_QUEUE;
1447         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1448         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1449         slave_dev->min_mtu = 0;
1450         slave_dev->max_mtu = ETH_MAX_MTU;
1451         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1452
1453         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1454                                  NULL);
1455
1456         SET_NETDEV_DEV(slave_dev, parent);
1457         slave_dev->dev.of_node = ds->ports[port].dn;
1458         slave_dev->vlan_features = master->vlan_features;
1459
1460         p = netdev_priv(slave_dev);
1461         p->dp = &ds->ports[port];
1462         INIT_LIST_HEAD(&p->mall_tc_list);
1463         p->xmit = dst->tag_ops->xmit;
1464
1465         p->old_pause = -1;
1466         p->old_link = -1;
1467         p->old_duplex = -1;
1468
1469         ds->ports[port].netdev = slave_dev;
1470         ret = register_netdev(slave_dev);
1471         if (ret) {
1472                 netdev_err(master, "error %d registering interface %s\n",
1473                            ret, slave_dev->name);
1474                 ds->ports[port].netdev = NULL;
1475                 free_netdev(slave_dev);
1476                 return ret;
1477         }
1478
1479         netif_carrier_off(slave_dev);
1480
1481         ret = dsa_slave_phy_setup(p, slave_dev);
1482         if (ret) {
1483                 netdev_err(master, "error %d setting up slave phy\n", ret);
1484                 unregister_netdev(slave_dev);
1485                 free_netdev(slave_dev);
1486                 return ret;
1487         }
1488
1489         return 0;
1490 }
1491
1492 void dsa_slave_destroy(struct net_device *slave_dev)
1493 {
1494         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1495         struct device_node *port_dn;
1496
1497         port_dn = p->dp->dn;
1498
1499         netif_carrier_off(slave_dev);
1500         if (p->phy) {
1501                 phy_disconnect(p->phy);
1502
1503                 if (of_phy_is_fixed_link(port_dn))
1504                         of_phy_deregister_fixed_link(port_dn);
1505         }
1506         unregister_netdev(slave_dev);
1507         free_netdev(slave_dev);
1508 }
1509
1510 static bool dsa_slave_dev_check(struct net_device *dev)
1511 {
1512         return dev->netdev_ops == &dsa_slave_netdev_ops;
1513 }
1514
1515 static int dsa_slave_changeupper(struct net_device *dev,
1516                                  struct netdev_notifier_changeupper_info *info)
1517 {
1518         struct dsa_slave_priv *p = netdev_priv(dev);
1519         struct dsa_port *dp = p->dp;
1520         int err = NOTIFY_DONE;
1521
1522         if (netif_is_bridge_master(info->upper_dev)) {
1523                 if (info->linking) {
1524                         err = dsa_port_bridge_join(dp, info->upper_dev);
1525                         err = notifier_from_errno(err);
1526                 } else {
1527                         dsa_port_bridge_leave(dp, info->upper_dev);
1528                         err = NOTIFY_OK;
1529                 }
1530         }
1531
1532         return err;
1533 }
1534
1535 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1536                                      unsigned long event, void *ptr)
1537 {
1538         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1539
1540         if (dev->netdev_ops != &dsa_slave_netdev_ops)
1541                 return NOTIFY_DONE;
1542
1543         if (event == NETDEV_CHANGEUPPER)
1544                 return dsa_slave_changeupper(dev, ptr);
1545
1546         return NOTIFY_DONE;
1547 }
1548
1549 static struct notifier_block dsa_slave_nb __read_mostly = {
1550         .notifier_call  = dsa_slave_netdevice_event,
1551 };
1552
1553 int dsa_slave_register_notifier(void)
1554 {
1555         return register_netdevice_notifier(&dsa_slave_nb);
1556 }
1557
1558 void dsa_slave_unregister_notifier(void)
1559 {
1560         int err;
1561
1562         err = unregister_netdevice_notifier(&dsa_slave_nb);
1563         if (err)
1564                 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1565 }