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 <net/rtnetlink.h>
  20 #include <net/switchdev.h>
  21 #include <linux/if_bridge.h>
  22 #include <linux/netpoll.h>
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->drv->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->drv->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
  53                  ds->dst->tree, ds->index);
  54         ds->slave_mii_bus->parent = ds->dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         struct dsa_slave_priv *p = netdev_priv(dev);
  63
  64         return p->parent->dst->master_netdev->ifindex;
  65 }
  66
  67 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  68 {
  69         return !!p->bridge_dev;
  70 }
  71
  72 static int dsa_slave_open(struct net_device *dev)
  73 {
  74         struct dsa_slave_priv *p = netdev_priv(dev);
  75         struct net_device *master = p->parent->dst->master_netdev;
  76         struct dsa_switch *ds = p->parent;
  77         u8 stp_state = dsa_port_is_bridged(p) ?
  78                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  79         int err;
  80
  81         if (!(master->flags & IFF_UP))
  82                 return -ENETDOWN;
  83
  84         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  85                 err = dev_uc_add(master, dev->dev_addr);
  86                 if (err < 0)
  87                         goto out;
  88         }
  89
  90         if (dev->flags & IFF_ALLMULTI) {
  91                 err = dev_set_allmulti(master, 1);
  92                 if (err < 0)
  93                         goto del_unicast;
  94         }
  95         if (dev->flags & IFF_PROMISC) {
  96                 err = dev_set_promiscuity(master, 1);
  97                 if (err < 0)
  98                         goto clear_allmulti;
  99         }
 100
 101         if (ds->drv->port_enable) {
 102                 err = ds->drv->port_enable(ds, p->port, p->phy);
 103                 if (err)
 104                         goto clear_promisc;
 105         }
 106
 107         if (ds->drv->port_stp_state_set)
 108                 ds->drv->port_stp_state_set(ds, p->port, stp_state);
 109
 110         if (p->phy)
 111                 phy_start(p->phy);
 112
 113         return 0;
 114
 115 clear_promisc:
 116         if (dev->flags & IFF_PROMISC)
 117                 dev_set_promiscuity(master, -1);
 118 clear_allmulti:
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121 del_unicast:
 122         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 123                 dev_uc_del(master, dev->dev_addr);
 124 out:
 125         return err;
 126 }
 127
 128 static int dsa_slave_close(struct net_device *dev)
 129 {
 130         struct dsa_slave_priv *p = netdev_priv(dev);
 131         struct net_device *master = p->parent->dst->master_netdev;
 132         struct dsa_switch *ds = p->parent;
 133
 134         if (p->phy)
 135                 phy_stop(p->phy);
 136
 137         dev_mc_unsync(master, dev);
 138         dev_uc_unsync(master, dev);
 139         if (dev->flags & IFF_ALLMULTI)
 140                 dev_set_allmulti(master, -1);
 141         if (dev->flags & IFF_PROMISC)
 142                 dev_set_promiscuity(master, -1);
 143
 144         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 145                 dev_uc_del(master, dev->dev_addr);
 146
 147         if (ds->drv->port_disable)
 148                 ds->drv->port_disable(ds, p->port, p->phy);
 149
 150         if (ds->drv->port_stp_state_set)
 151                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_DISABLED);
 152
 153         return 0;
 154 }
 155
 156 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 157 {
 158         struct dsa_slave_priv *p = netdev_priv(dev);
 159         struct net_device *master = p->parent->dst->master_netdev;
 160
 161         if (change & IFF_ALLMULTI)
 162                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 163         if (change & IFF_PROMISC)
 164                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 165 }
 166
 167 static void dsa_slave_set_rx_mode(struct net_device *dev)
 168 {
 169         struct dsa_slave_priv *p = netdev_priv(dev);
 170         struct net_device *master = p->parent->dst->master_netdev;
 171
 172         dev_mc_sync(master, dev);
 173         dev_uc_sync(master, dev);
 174 }
 175
 176 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 177 {
 178         struct dsa_slave_priv *p = netdev_priv(dev);
 179         struct net_device *master = p->parent->dst->master_netdev;
 180         struct sockaddr *addr = a;
 181         int err;
 182
 183         if (!is_valid_ether_addr(addr->sa_data))
 184                 return -EADDRNOTAVAIL;
 185
 186         if (!(dev->flags & IFF_UP))
 187                 goto out;
 188
 189         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 190                 err = dev_uc_add(master, addr->sa_data);
 191                 if (err < 0)
 192                         return err;
 193         }
 194
 195         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 196                 dev_uc_del(master, dev->dev_addr);
 197
 198 out:
 199         ether_addr_copy(dev->dev_addr, addr->sa_data);
 200
 201         return 0;
 202 }
 203
 204 static int dsa_slave_port_vlan_add(struct net_device *dev,
 205                                    const struct switchdev_obj_port_vlan *vlan,
 206                                    struct switchdev_trans *trans)
 207 {
 208         struct dsa_slave_priv *p = netdev_priv(dev);
 209         struct dsa_switch *ds = p->parent;
 210
 211         if (switchdev_trans_ph_prepare(trans)) {
 212                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 213                         return -EOPNOTSUPP;
 214
 215                 return ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 216         }
 217
 218         ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 219
 220         return 0;
 221 }
 222
 223 static int dsa_slave_port_vlan_del(struct net_device *dev,
 224                                    const struct switchdev_obj_port_vlan *vlan)
 225 {
 226         struct dsa_slave_priv *p = netdev_priv(dev);
 227         struct dsa_switch *ds = p->parent;
 228
 229         if (!ds->drv->port_vlan_del)
 230                 return -EOPNOTSUPP;
 231
 232         return ds->drv->port_vlan_del(ds, p->port, vlan);
 233 }
 234
 235 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 236                                     struct switchdev_obj_port_vlan *vlan,
 237                                     switchdev_obj_dump_cb_t *cb)
 238 {
 239         struct dsa_slave_priv *p = netdev_priv(dev);
 240         struct dsa_switch *ds = p->parent;
 241
 242         if (ds->drv->port_vlan_dump)
 243                 return ds->drv->port_vlan_dump(ds, p->port, vlan, cb);
 244
 245         return -EOPNOTSUPP;
 246 }
 247
 248 static int dsa_slave_port_fdb_add(struct net_device *dev,
 249                                   const struct switchdev_obj_port_fdb *fdb,
 250                                   struct switchdev_trans *trans)
 251 {
 252         struct dsa_slave_priv *p = netdev_priv(dev);
 253         struct dsa_switch *ds = p->parent;
 254
 255         if (switchdev_trans_ph_prepare(trans)) {
 256                 if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 257                         return -EOPNOTSUPP;
 258
 259                 return ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 260         }
 261
 262         ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 263
 264         return 0;
 265 }
 266
 267 static int dsa_slave_port_fdb_del(struct net_device *dev,
 268                                   const struct switchdev_obj_port_fdb *fdb)
 269 {
 270         struct dsa_slave_priv *p = netdev_priv(dev);
 271         struct dsa_switch *ds = p->parent;
 272         int ret = -EOPNOTSUPP;
 273
 274         if (ds->drv->port_fdb_del)
 275                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 276
 277         return ret;
 278 }
 279
 280 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 281                                    struct switchdev_obj_port_fdb *fdb,
 282                                    switchdev_obj_dump_cb_t *cb)
 283 {
 284         struct dsa_slave_priv *p = netdev_priv(dev);
 285         struct dsa_switch *ds = p->parent;
 286
 287         if (ds->drv->port_fdb_dump)
 288                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 289
 290         return -EOPNOTSUPP;
 291 }
 292
 293 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 294 {
 295         struct dsa_slave_priv *p = netdev_priv(dev);
 296
 297         if (p->phy != NULL)
 298                 return phy_mii_ioctl(p->phy, ifr, cmd);
 299
 300         return -EOPNOTSUPP;
 301 }
 302
 303 static int dsa_slave_stp_state_set(struct net_device *dev,
 304                                    const struct switchdev_attr *attr,
 305                                    struct switchdev_trans *trans)
 306 {
 307         struct dsa_slave_priv *p = netdev_priv(dev);
 308         struct dsa_switch *ds = p->parent;
 309
 310         if (switchdev_trans_ph_prepare(trans))
 311                 return ds->drv->port_stp_state_set ? 0 : -EOPNOTSUPP;
 312
 313         ds->drv->port_stp_state_set(ds, p->port, attr->u.stp_state);
 314
 315         return 0;
 316 }
 317
 318 static int dsa_slave_vlan_filtering(struct net_device *dev,
 319                                     const struct switchdev_attr *attr,
 320                                     struct switchdev_trans *trans)
 321 {
 322         struct dsa_slave_priv *p = netdev_priv(dev);
 323         struct dsa_switch *ds = p->parent;
 324
 325         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 326         if (switchdev_trans_ph_prepare(trans))
 327                 return 0;
 328
 329         if (ds->drv->port_vlan_filtering)
 330                 return ds->drv->port_vlan_filtering(ds, p->port,
 331                                                     attr->u.vlan_filtering);
 332
 333         return 0;
 334 }
 335
 336 static int dsa_slave_port_attr_set(struct net_device *dev,
 337                                    const struct switchdev_attr *attr,
 338                                    struct switchdev_trans *trans)
 339 {
 340         int ret;
 341
 342         switch (attr->id) {
 343         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 344                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 345                 break;
 346         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 347                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 348                 break;
 349         default:
 350                 ret = -EOPNOTSUPP;
 351                 break;
 352         }
 353
 354         return ret;
 355 }
 356
 357 static int dsa_slave_port_obj_add(struct net_device *dev,
 358                                   const struct switchdev_obj *obj,
 359                                   struct switchdev_trans *trans)
 360 {
 361         int err;
 362
 363         /* For the prepare phase, ensure the full set of changes is feasable in
 364          * one go in order to signal a failure properly. If an operation is not
 365          * supported, return -EOPNOTSUPP.
 366          */
 367
 368         switch (obj->id) {
 369         case SWITCHDEV_OBJ_ID_PORT_FDB:
 370                 err = dsa_slave_port_fdb_add(dev,
 371                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 372                                              trans);
 373                 break;
 374         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 375                 err = dsa_slave_port_vlan_add(dev,
 376                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 377                                               trans);
 378                 break;
 379         default:
 380                 err = -EOPNOTSUPP;
 381                 break;
 382         }
 383
 384         return err;
 385 }
 386
 387 static int dsa_slave_port_obj_del(struct net_device *dev,
 388                                   const struct switchdev_obj *obj)
 389 {
 390         int err;
 391
 392         switch (obj->id) {
 393         case SWITCHDEV_OBJ_ID_PORT_FDB:
 394                 err = dsa_slave_port_fdb_del(dev,
 395                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 396                 break;
 397         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 398                 err = dsa_slave_port_vlan_del(dev,
 399                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 400                 break;
 401         default:
 402                 err = -EOPNOTSUPP;
 403                 break;
 404         }
 405
 406         return err;
 407 }
 408
 409 static int dsa_slave_port_obj_dump(struct net_device *dev,
 410                                    struct switchdev_obj *obj,
 411                                    switchdev_obj_dump_cb_t *cb)
 412 {
 413         int err;
 414
 415         switch (obj->id) {
 416         case SWITCHDEV_OBJ_ID_PORT_FDB:
 417                 err = dsa_slave_port_fdb_dump(dev,
 418                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 419                                               cb);
 420                 break;
 421         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 422                 err = dsa_slave_port_vlan_dump(dev,
 423                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 424                                                cb);
 425                 break;
 426         default:
 427                 err = -EOPNOTSUPP;
 428                 break;
 429         }
 430
 431         return err;
 432 }
 433
 434 static int dsa_slave_bridge_port_join(struct net_device *dev,
 435                                       struct net_device *br)
 436 {
 437         struct dsa_slave_priv *p = netdev_priv(dev);
 438         struct dsa_switch *ds = p->parent;
 439         int ret = -EOPNOTSUPP;
 440
 441         p->bridge_dev = br;
 442
 443         if (ds->drv->port_bridge_join)
 444                 ret = ds->drv->port_bridge_join(ds, p->port, br);
 445
 446         return ret == -EOPNOTSUPP ? 0 : ret;
 447 }
 448
 449 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 450 {
 451         struct dsa_slave_priv *p = netdev_priv(dev);
 452         struct dsa_switch *ds = p->parent;
 453
 454
 455         if (ds->drv->port_bridge_leave)
 456                 ds->drv->port_bridge_leave(ds, p->port);
 457
 458         p->bridge_dev = NULL;
 459
 460         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 461          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 462          */
 463         if (ds->drv->port_stp_state_set)
 464                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
 465 }
 466
 467 static int dsa_slave_port_attr_get(struct net_device *dev,
 468                                    struct switchdev_attr *attr)
 469 {
 470         struct dsa_slave_priv *p = netdev_priv(dev);
 471         struct dsa_switch *ds = p->parent;
 472
 473         switch (attr->id) {
 474         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 475                 attr->u.ppid.id_len = sizeof(ds->index);
 476                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 477                 break;
 478         default:
 479                 return -EOPNOTSUPP;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 486                                                struct sk_buff *skb)
 487 {
 488 #ifdef CONFIG_NET_POLL_CONTROLLER
 489         if (p->netpoll)
 490                 netpoll_send_skb(p->netpoll, skb);
 491 #else
 492         BUG();
 493 #endif
 494         return NETDEV_TX_OK;
 495 }
 496
 497 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 498 {
 499         struct dsa_slave_priv *p = netdev_priv(dev);
 500         struct sk_buff *nskb;
 501
 502         dev->stats.tx_packets++;
 503         dev->stats.tx_bytes += skb->len;
 504
 505         /* Transmit function may have to reallocate the original SKB */
 506         nskb = p->xmit(skb, dev);
 507         if (!nskb)
 508                 return NETDEV_TX_OK;
 509
 510         /* SKB for netpoll still need to be mangled with the protocol-specific
 511          * tag to be successfully transmitted
 512          */
 513         if (unlikely(netpoll_tx_running(dev)))
 514                 return dsa_netpoll_send_skb(p, nskb);
 515
 516         /* Queue the SKB for transmission on the parent interface, but
 517          * do not modify its EtherType
 518          */
 519         nskb->dev = p->parent->dst->master_netdev;
 520         dev_queue_xmit(nskb);
 521
 522         return NETDEV_TX_OK;
 523 }
 524
 525 /* ethtool operations *******************************************************/
 526 static int
 527 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 528 {
 529         struct dsa_slave_priv *p = netdev_priv(dev);
 530         int err;
 531
 532         err = -EOPNOTSUPP;
 533         if (p->phy != NULL) {
 534                 err = phy_read_status(p->phy);
 535                 if (err == 0)
 536                         err = phy_ethtool_gset(p->phy, cmd);
 537         }
 538
 539         return err;
 540 }
 541
 542 static int
 543 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 544 {
 545         struct dsa_slave_priv *p = netdev_priv(dev);
 546
 547         if (p->phy != NULL)
 548                 return phy_ethtool_sset(p->phy, cmd);
 549
 550         return -EOPNOTSUPP;
 551 }
 552
 553 static void dsa_slave_get_drvinfo(struct net_device *dev,
 554                                   struct ethtool_drvinfo *drvinfo)
 555 {
 556         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 557         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 558         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 559         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 560 }
 561
 562 static int dsa_slave_get_regs_len(struct net_device *dev)
 563 {
 564         struct dsa_slave_priv *p = netdev_priv(dev);
 565         struct dsa_switch *ds = p->parent;
 566
 567         if (ds->drv->get_regs_len)
 568                 return ds->drv->get_regs_len(ds, p->port);
 569
 570         return -EOPNOTSUPP;
 571 }
 572
 573 static void
 574 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 575 {
 576         struct dsa_slave_priv *p = netdev_priv(dev);
 577         struct dsa_switch *ds = p->parent;
 578
 579         if (ds->drv->get_regs)
 580                 ds->drv->get_regs(ds, p->port, regs, _p);
 581 }
 582
 583 static int dsa_slave_nway_reset(struct net_device *dev)
 584 {
 585         struct dsa_slave_priv *p = netdev_priv(dev);
 586
 587         if (p->phy != NULL)
 588                 return genphy_restart_aneg(p->phy);
 589
 590         return -EOPNOTSUPP;
 591 }
 592
 593 static u32 dsa_slave_get_link(struct net_device *dev)
 594 {
 595         struct dsa_slave_priv *p = netdev_priv(dev);
 596
 597         if (p->phy != NULL) {
 598                 genphy_update_link(p->phy);
 599                 return p->phy->link;
 600         }
 601
 602         return -EOPNOTSUPP;
 603 }
 604
 605 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 606 {
 607         struct dsa_slave_priv *p = netdev_priv(dev);
 608         struct dsa_switch *ds = p->parent;
 609
 610         if (ds->cd && ds->cd->eeprom_len)
 611                 return ds->cd->eeprom_len;
 612
 613         if (ds->drv->get_eeprom_len)
 614                 return ds->drv->get_eeprom_len(ds);
 615
 616         return 0;
 617 }
 618
 619 static int dsa_slave_get_eeprom(struct net_device *dev,
 620                                 struct ethtool_eeprom *eeprom, u8 *data)
 621 {
 622         struct dsa_slave_priv *p = netdev_priv(dev);
 623         struct dsa_switch *ds = p->parent;
 624
 625         if (ds->drv->get_eeprom)
 626                 return ds->drv->get_eeprom(ds, eeprom, data);
 627
 628         return -EOPNOTSUPP;
 629 }
 630
 631 static int dsa_slave_set_eeprom(struct net_device *dev,
 632                                 struct ethtool_eeprom *eeprom, u8 *data)
 633 {
 634         struct dsa_slave_priv *p = netdev_priv(dev);
 635         struct dsa_switch *ds = p->parent;
 636
 637         if (ds->drv->set_eeprom)
 638                 return ds->drv->set_eeprom(ds, eeprom, data);
 639
 640         return -EOPNOTSUPP;
 641 }
 642
 643 static void dsa_slave_get_strings(struct net_device *dev,
 644                                   uint32_t stringset, uint8_t *data)
 645 {
 646         struct dsa_slave_priv *p = netdev_priv(dev);
 647         struct dsa_switch *ds = p->parent;
 648
 649         if (stringset == ETH_SS_STATS) {
 650                 int len = ETH_GSTRING_LEN;
 651
 652                 strncpy(data, "tx_packets", len);
 653                 strncpy(data + len, "tx_bytes", len);
 654                 strncpy(data + 2 * len, "rx_packets", len);
 655                 strncpy(data + 3 * len, "rx_bytes", len);
 656                 if (ds->drv->get_strings != NULL)
 657                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 658         }
 659 }
 660
 661 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 662                                            struct ethtool_stats *stats,
 663                                            uint64_t *data)
 664 {
 665         struct dsa_switch_tree *dst = dev->dsa_ptr;
 666         struct dsa_switch *ds = dst->ds[0];
 667         s8 cpu_port = dst->cpu_port;
 668         int count = 0;
 669
 670         if (dst->master_ethtool_ops.get_sset_count) {
 671                 count = dst->master_ethtool_ops.get_sset_count(dev,
 672                                                                ETH_SS_STATS);
 673                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 674         }
 675
 676         if (ds->drv->get_ethtool_stats)
 677                 ds->drv->get_ethtool_stats(ds, cpu_port, data + count);
 678 }
 679
 680 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 681 {
 682         struct dsa_switch_tree *dst = dev->dsa_ptr;
 683         struct dsa_switch *ds = dst->ds[0];
 684         int count = 0;
 685
 686         if (dst->master_ethtool_ops.get_sset_count)
 687                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 688
 689         if (sset == ETH_SS_STATS && ds->drv->get_sset_count)
 690                 count += ds->drv->get_sset_count(ds);
 691
 692         return count;
 693 }
 694
 695 static void dsa_cpu_port_get_strings(struct net_device *dev,
 696                                      uint32_t stringset, uint8_t *data)
 697 {
 698         struct dsa_switch_tree *dst = dev->dsa_ptr;
 699         struct dsa_switch *ds = dst->ds[0];
 700         s8 cpu_port = dst->cpu_port;
 701         int len = ETH_GSTRING_LEN;
 702         int mcount = 0, count;
 703         unsigned int i;
 704         uint8_t pfx[4];
 705         uint8_t *ndata;
 706
 707         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 708         /* We do not want to be NULL-terminated, since this is a prefix */
 709         pfx[sizeof(pfx) - 1] = '_';
 710
 711         if (dst->master_ethtool_ops.get_sset_count) {
 712                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 713                                                                 ETH_SS_STATS);
 714                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 715         }
 716
 717         if (stringset == ETH_SS_STATS && ds->drv->get_strings) {
 718                 ndata = data + mcount * len;
 719                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 720                  * the output after to prepend our CPU port prefix we
 721                  * constructed earlier
 722                  */
 723                 ds->drv->get_strings(ds, cpu_port, ndata);
 724                 count = ds->drv->get_sset_count(ds);
 725                 for (i = 0; i < count; i++) {
 726                         memmove(ndata + (i * len + sizeof(pfx)),
 727                                 ndata + i * len, len - sizeof(pfx));
 728                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 729                 }
 730         }
 731 }
 732
 733 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 734                                         struct ethtool_stats *stats,
 735                                         uint64_t *data)
 736 {
 737         struct dsa_slave_priv *p = netdev_priv(dev);
 738         struct dsa_switch *ds = p->parent;
 739
 740         data[0] = dev->stats.tx_packets;
 741         data[1] = dev->stats.tx_bytes;
 742         data[2] = dev->stats.rx_packets;
 743         data[3] = dev->stats.rx_bytes;
 744         if (ds->drv->get_ethtool_stats != NULL)
 745                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 746 }
 747
 748 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 749 {
 750         struct dsa_slave_priv *p = netdev_priv(dev);
 751         struct dsa_switch *ds = p->parent;
 752
 753         if (sset == ETH_SS_STATS) {
 754                 int count;
 755
 756                 count = 4;
 757                 if (ds->drv->get_sset_count != NULL)
 758                         count += ds->drv->get_sset_count(ds);
 759
 760                 return count;
 761         }
 762
 763         return -EOPNOTSUPP;
 764 }
 765
 766 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 767 {
 768         struct dsa_slave_priv *p = netdev_priv(dev);
 769         struct dsa_switch *ds = p->parent;
 770
 771         if (ds->drv->get_wol)
 772                 ds->drv->get_wol(ds, p->port, w);
 773 }
 774
 775 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 776 {
 777         struct dsa_slave_priv *p = netdev_priv(dev);
 778         struct dsa_switch *ds = p->parent;
 779         int ret = -EOPNOTSUPP;
 780
 781         if (ds->drv->set_wol)
 782                 ret = ds->drv->set_wol(ds, p->port, w);
 783
 784         return ret;
 785 }
 786
 787 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 788 {
 789         struct dsa_slave_priv *p = netdev_priv(dev);
 790         struct dsa_switch *ds = p->parent;
 791         int ret;
 792
 793         if (!ds->drv->set_eee)
 794                 return -EOPNOTSUPP;
 795
 796         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 797         if (ret)
 798                 return ret;
 799
 800         if (p->phy)
 801                 ret = phy_ethtool_set_eee(p->phy, e);
 802
 803         return ret;
 804 }
 805
 806 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 807 {
 808         struct dsa_slave_priv *p = netdev_priv(dev);
 809         struct dsa_switch *ds = p->parent;
 810         int ret;
 811
 812         if (!ds->drv->get_eee)
 813                 return -EOPNOTSUPP;
 814
 815         ret = ds->drv->get_eee(ds, p->port, e);
 816         if (ret)
 817                 return ret;
 818
 819         if (p->phy)
 820                 ret = phy_ethtool_get_eee(p->phy, e);
 821
 822         return ret;
 823 }
 824
 825 #ifdef CONFIG_NET_POLL_CONTROLLER
 826 static int dsa_slave_netpoll_setup(struct net_device *dev,
 827                                    struct netpoll_info *ni)
 828 {
 829         struct dsa_slave_priv *p = netdev_priv(dev);
 830         struct dsa_switch *ds = p->parent;
 831         struct net_device *master = ds->dst->master_netdev;
 832         struct netpoll *netpoll;
 833         int err = 0;
 834
 835         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 836         if (!netpoll)
 837                 return -ENOMEM;
 838
 839         err = __netpoll_setup(netpoll, master);
 840         if (err) {
 841                 kfree(netpoll);
 842                 goto out;
 843         }
 844
 845         p->netpoll = netpoll;
 846 out:
 847         return err;
 848 }
 849
 850 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 851 {
 852         struct dsa_slave_priv *p = netdev_priv(dev);
 853         struct netpoll *netpoll = p->netpoll;
 854
 855         if (!netpoll)
 856                 return;
 857
 858         p->netpoll = NULL;
 859
 860         __netpoll_free_async(netpoll);
 861 }
 862
 863 static void dsa_slave_poll_controller(struct net_device *dev)
 864 {
 865 }
 866 #endif
 867
 868 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 869 {
 870         ops->get_sset_count = dsa_cpu_port_get_sset_count;
 871         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
 872         ops->get_strings = dsa_cpu_port_get_strings;
 873 }
 874
 875 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 876         .get_settings           = dsa_slave_get_settings,
 877         .set_settings           = dsa_slave_set_settings,
 878         .get_drvinfo            = dsa_slave_get_drvinfo,
 879         .get_regs_len           = dsa_slave_get_regs_len,
 880         .get_regs               = dsa_slave_get_regs,
 881         .nway_reset             = dsa_slave_nway_reset,
 882         .get_link               = dsa_slave_get_link,
 883         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 884         .get_eeprom             = dsa_slave_get_eeprom,
 885         .set_eeprom             = dsa_slave_set_eeprom,
 886         .get_strings            = dsa_slave_get_strings,
 887         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 888         .get_sset_count         = dsa_slave_get_sset_count,
 889         .set_wol                = dsa_slave_set_wol,
 890         .get_wol                = dsa_slave_get_wol,
 891         .set_eee                = dsa_slave_set_eee,
 892         .get_eee                = dsa_slave_get_eee,
 893 };
 894
 895 static const struct net_device_ops dsa_slave_netdev_ops = {
 896         .ndo_open               = dsa_slave_open,
 897         .ndo_stop               = dsa_slave_close,
 898         .ndo_start_xmit         = dsa_slave_xmit,
 899         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 900         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 901         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 902         .ndo_fdb_add            = switchdev_port_fdb_add,
 903         .ndo_fdb_del            = switchdev_port_fdb_del,
 904         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 905         .ndo_do_ioctl           = dsa_slave_ioctl,
 906         .ndo_get_iflink         = dsa_slave_get_iflink,
 907 #ifdef CONFIG_NET_POLL_CONTROLLER
 908         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 909         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 910         .ndo_poll_controller    = dsa_slave_poll_controller,
 911 #endif
 912         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 913         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 914         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 915 };
 916
 917 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 918         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 919         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 920         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 921         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 922         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 923 };
 924
 925 static struct device_type dsa_type = {
 926         .name   = "dsa",
 927 };
 928
 929 static void dsa_slave_adjust_link(struct net_device *dev)
 930 {
 931         struct dsa_slave_priv *p = netdev_priv(dev);
 932         struct dsa_switch *ds = p->parent;
 933         unsigned int status_changed = 0;
 934
 935         if (p->old_link != p->phy->link) {
 936                 status_changed = 1;
 937                 p->old_link = p->phy->link;
 938         }
 939
 940         if (p->old_duplex != p->phy->duplex) {
 941                 status_changed = 1;
 942                 p->old_duplex = p->phy->duplex;
 943         }
 944
 945         if (p->old_pause != p->phy->pause) {
 946                 status_changed = 1;
 947                 p->old_pause = p->phy->pause;
 948         }
 949
 950         if (ds->drv->adjust_link && status_changed)
 951                 ds->drv->adjust_link(ds, p->port, p->phy);
 952
 953         if (status_changed)
 954                 phy_print_status(p->phy);
 955 }
 956
 957 static int dsa_slave_fixed_link_update(struct net_device *dev,
 958                                        struct fixed_phy_status *status)
 959 {
 960         struct dsa_slave_priv *p;
 961         struct dsa_switch *ds;
 962
 963         if (dev) {
 964                 p = netdev_priv(dev);
 965                 ds = p->parent;
 966                 if (ds->drv->fixed_link_update)
 967                         ds->drv->fixed_link_update(ds, p->port, status);
 968         }
 969
 970         return 0;
 971 }
 972
 973 /* slave device setup *******************************************************/
 974 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 975                                  struct net_device *slave_dev,
 976                                  int addr)
 977 {
 978         struct dsa_switch *ds = p->parent;
 979
 980         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
 981         if (!p->phy) {
 982                 netdev_err(slave_dev, "no phy at %d\n", addr);
 983                 return -ENODEV;
 984         }
 985
 986         /* Use already configured phy mode */
 987         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
 988                 p->phy_interface = p->phy->interface;
 989         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 990                            p->phy_interface);
 991
 992         return 0;
 993 }
 994
 995 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 996                                 struct net_device *slave_dev)
 997 {
 998         struct dsa_switch *ds = p->parent;
 999         struct device_node *phy_dn, *port_dn;
1000         bool phy_is_fixed = false;
1001         u32 phy_flags = 0;
1002         int mode, ret;
1003
1004         port_dn = ds->ports[p->port].dn;
1005         mode = of_get_phy_mode(port_dn);
1006         if (mode < 0)
1007                 mode = PHY_INTERFACE_MODE_NA;
1008         p->phy_interface = mode;
1009
1010         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1011         if (of_phy_is_fixed_link(port_dn)) {
1012                 /* In the case of a fixed PHY, the DT node associated
1013                  * to the fixed PHY is the Port DT node
1014                  */
1015                 ret = of_phy_register_fixed_link(port_dn);
1016                 if (ret) {
1017                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1018                         return ret;
1019                 }
1020                 phy_is_fixed = true;
1021                 phy_dn = port_dn;
1022         }
1023
1024         if (ds->drv->get_phy_flags)
1025                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1026
1027         if (phy_dn) {
1028                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1029
1030                 /* If this PHY address is part of phys_mii_mask, which means
1031                  * that we need to divert reads and writes to/from it, then we
1032                  * want to bind this device using the slave MII bus created by
1033                  * DSA to make that happen.
1034                  */
1035                 if (!phy_is_fixed && phy_id >= 0 &&
1036                     (ds->phys_mii_mask & (1 << phy_id))) {
1037                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1038                         if (ret) {
1039                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1040                                 return ret;
1041                         }
1042                 } else {
1043                         p->phy = of_phy_connect(slave_dev, phy_dn,
1044                                                 dsa_slave_adjust_link,
1045                                                 phy_flags,
1046                                                 p->phy_interface);
1047                 }
1048         }
1049
1050         if (p->phy && phy_is_fixed)
1051                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1052
1053         /* We could not connect to a designated PHY, so use the switch internal
1054          * MDIO bus instead
1055          */
1056         if (!p->phy) {
1057                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1058                 if (ret) {
1059                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1060                         return ret;
1061                 }
1062         }
1063
1064         phy_attached_info(p->phy);
1065
1066         return 0;
1067 }
1068
1069 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1070 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1071                                             struct netdev_queue *txq,
1072                                             void *_unused)
1073 {
1074         lockdep_set_class(&txq->_xmit_lock,
1075                           &dsa_slave_netdev_xmit_lock_key);
1076 }
1077
1078 int dsa_slave_suspend(struct net_device *slave_dev)
1079 {
1080         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1081
1082         if (p->phy) {
1083                 phy_stop(p->phy);
1084                 p->old_pause = -1;
1085                 p->old_link = -1;
1086                 p->old_duplex = -1;
1087                 phy_suspend(p->phy);
1088         }
1089
1090         return 0;
1091 }
1092
1093 int dsa_slave_resume(struct net_device *slave_dev)
1094 {
1095         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1096
1097         netif_device_attach(slave_dev);
1098
1099         if (p->phy) {
1100                 phy_resume(p->phy);
1101                 phy_start(p->phy);
1102         }
1103
1104         return 0;
1105 }
1106
1107 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1108                      int port, const char *name)
1109 {
1110         struct dsa_switch_tree *dst = ds->dst;
1111         struct net_device *master;
1112         struct net_device *slave_dev;
1113         struct dsa_slave_priv *p;
1114         int ret;
1115
1116         master = ds->dst->master_netdev;
1117         if (ds->master_netdev)
1118                 master = ds->master_netdev;
1119
1120         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1121                                  NET_NAME_UNKNOWN, ether_setup);
1122         if (slave_dev == NULL)
1123                 return -ENOMEM;
1124
1125         slave_dev->features = master->vlan_features;
1126         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1127         eth_hw_addr_inherit(slave_dev, master);
1128         slave_dev->priv_flags |= IFF_NO_QUEUE;
1129         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1130         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1131         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1132
1133         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1134                                  NULL);
1135
1136         SET_NETDEV_DEV(slave_dev, parent);
1137         slave_dev->dev.of_node = ds->ports[port].dn;
1138         slave_dev->vlan_features = master->vlan_features;
1139
1140         p = netdev_priv(slave_dev);
1141         p->parent = ds;
1142         p->port = port;
1143         p->xmit = dst->tag_ops->xmit;
1144
1145         p->old_pause = -1;
1146         p->old_link = -1;
1147         p->old_duplex = -1;
1148
1149         ds->ports[port].netdev = slave_dev;
1150         ret = register_netdev(slave_dev);
1151         if (ret) {
1152                 netdev_err(master, "error %d registering interface %s\n",
1153                            ret, slave_dev->name);
1154                 ds->ports[port].netdev = NULL;
1155                 free_netdev(slave_dev);
1156                 return ret;
1157         }
1158
1159         netif_carrier_off(slave_dev);
1160
1161         ret = dsa_slave_phy_setup(p, slave_dev);
1162         if (ret) {
1163                 netdev_err(master, "error %d setting up slave phy\n", ret);
1164                 unregister_netdev(slave_dev);
1165                 free_netdev(slave_dev);
1166                 return ret;
1167         }
1168
1169         return 0;
1170 }
1171
1172 void dsa_slave_destroy(struct net_device *slave_dev)
1173 {
1174         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1175
1176         netif_carrier_off(slave_dev);
1177         if (p->phy)
1178                 phy_disconnect(p->phy);
1179         unregister_netdev(slave_dev);
1180         free_netdev(slave_dev);
1181 }
1182
1183 static bool dsa_slave_dev_check(struct net_device *dev)
1184 {
1185         return dev->netdev_ops == &dsa_slave_netdev_ops;
1186 }
1187
1188 static int dsa_slave_port_upper_event(struct net_device *dev,
1189                                       unsigned long event, void *ptr)
1190 {
1191         struct netdev_notifier_changeupper_info *info = ptr;
1192         struct net_device *upper = info->upper_dev;
1193         int err = 0;
1194
1195         switch (event) {
1196         case NETDEV_CHANGEUPPER:
1197                 if (netif_is_bridge_master(upper)) {
1198                         if (info->linking)
1199                                 err = dsa_slave_bridge_port_join(dev, upper);
1200                         else
1201                                 dsa_slave_bridge_port_leave(dev);
1202                 }
1203
1204                 break;
1205         }
1206
1207         return notifier_from_errno(err);
1208 }
1209
1210 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1211                                 void *ptr)
1212 {
1213         switch (event) {
1214         case NETDEV_CHANGEUPPER:
1215                 return dsa_slave_port_upper_event(dev, event, ptr);
1216         }
1217
1218         return NOTIFY_DONE;
1219 }
1220
1221 int dsa_slave_netdevice_event(struct notifier_block *unused,
1222                               unsigned long event, void *ptr)
1223 {
1224         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1225
1226         if (dsa_slave_dev_check(dev))
1227                 return dsa_slave_port_event(dev, event, ptr);
1228
1229         return NOTIFY_DONE;
1230 }