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:%.2x",
  53                         ds->index, ds->pd->sw_addr);
  54         ds->slave_mii_bus->parent = ds->master_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_update)
 108                 ds->drv->port_stp_update(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_update)
 151                 ds->drv->port_stp_update(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_bridge_check_vlan_range(struct dsa_switch *ds,
 205                                        const struct net_device *bridge,
 206                                        u16 vid_begin, u16 vid_end)
 207 {
 208         struct dsa_slave_priv *p;
 209         struct net_device *dev, *vlan_br;
 210         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 211         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 212         u16 vid;
 213         int member, err;
 214
 215         if (!ds->drv->vlan_getnext || !vid_begin)
 216                 return -EOPNOTSUPP;
 217
 218         vid = vid_begin - 1;
 219
 220         do {
 221                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 222                 if (err)
 223                         break;
 224
 225                 if (vid > vid_end)
 226                         break;
 227
 228                 member = find_first_bit(members, DSA_MAX_PORTS);
 229                 if (member == DSA_MAX_PORTS)
 230                         continue;
 231
 232                 dev = ds->ports[member];
 233                 p = netdev_priv(dev);
 234                 vlan_br = p->bridge_dev;
 235                 if (vlan_br == bridge)
 236                         continue;
 237
 238                 netdev_dbg(vlan_br, "hardware VLAN %d already in use\n", vid);
 239                 return -EOPNOTSUPP;
 240         } while (vid < vid_end);
 241
 242         return err == -ENOENT ? 0 : err;
 243 }
 244
 245 static int dsa_slave_port_vlan_add(struct net_device *dev,
 246                                    const struct switchdev_obj_port_vlan *vlan,
 247                                    struct switchdev_trans *trans)
 248 {
 249         struct dsa_slave_priv *p = netdev_priv(dev);
 250         struct dsa_switch *ds = p->parent;
 251         int err;
 252
 253         if (switchdev_trans_ph_prepare(trans)) {
 254                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 255                         return -EOPNOTSUPP;
 256
 257                 /* If the requested port doesn't belong to the same bridge as
 258                  * the VLAN members, fallback to software VLAN (hopefully).
 259                  */
 260                 err = dsa_bridge_check_vlan_range(ds, p->bridge_dev,
 261                                                   vlan->vid_begin,
 262                                                   vlan->vid_end);
 263                 if (err)
 264                         return err;
 265
 266                 err = ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 267                 if (err)
 268                         return err;
 269         } else {
 270                 err = ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 271                 if (err)
 272                         return err;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int dsa_slave_port_vlan_del(struct net_device *dev,
 279                                    const struct switchdev_obj_port_vlan *vlan)
 280 {
 281         struct dsa_slave_priv *p = netdev_priv(dev);
 282         struct dsa_switch *ds = p->parent;
 283
 284         if (!ds->drv->port_vlan_del)
 285                 return -EOPNOTSUPP;
 286
 287         return ds->drv->port_vlan_del(ds, p->port, vlan);
 288 }
 289
 290 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 291                                     struct switchdev_obj_port_vlan *vlan,
 292                                     switchdev_obj_dump_cb_t *cb)
 293 {
 294         struct dsa_slave_priv *p = netdev_priv(dev);
 295         struct dsa_switch *ds = p->parent;
 296         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 297         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 298         u16 pvid, vid = 0;
 299         int err;
 300
 301         if (!ds->drv->vlan_getnext || !ds->drv->port_pvid_get)
 302                 return -EOPNOTSUPP;
 303
 304         err = ds->drv->port_pvid_get(ds, p->port, &pvid);
 305         if (err)
 306                 return err;
 307
 308         for (;;) {
 309                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 310                 if (err)
 311                         break;
 312
 313                 if (!test_bit(p->port, members))
 314                         continue;
 315
 316                 memset(vlan, 0, sizeof(*vlan));
 317                 vlan->vid_begin = vlan->vid_end = vid;
 318
 319                 if (vid == pvid)
 320                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 321
 322                 if (test_bit(p->port, untagged))
 323                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 324
 325                 err = cb(&vlan->obj);
 326                 if (err)
 327                         break;
 328         }
 329
 330         return err == -ENOENT ? 0 : err;
 331 }
 332
 333 static int dsa_slave_port_fdb_add(struct net_device *dev,
 334                                   const struct switchdev_obj_port_fdb *fdb,
 335                                   struct switchdev_trans *trans)
 336 {
 337         struct dsa_slave_priv *p = netdev_priv(dev);
 338         struct dsa_switch *ds = p->parent;
 339         int ret;
 340
 341         if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 342                 return -EOPNOTSUPP;
 343
 344         if (switchdev_trans_ph_prepare(trans))
 345                 ret = ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 346         else
 347                 ret = ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 348
 349         return ret;
 350 }
 351
 352 static int dsa_slave_port_fdb_del(struct net_device *dev,
 353                                   const struct switchdev_obj_port_fdb *fdb)
 354 {
 355         struct dsa_slave_priv *p = netdev_priv(dev);
 356         struct dsa_switch *ds = p->parent;
 357         int ret = -EOPNOTSUPP;
 358
 359         if (ds->drv->port_fdb_del)
 360                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 361
 362         return ret;
 363 }
 364
 365 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 366                                    struct switchdev_obj_port_fdb *fdb,
 367                                    switchdev_obj_dump_cb_t *cb)
 368 {
 369         struct dsa_slave_priv *p = netdev_priv(dev);
 370         struct dsa_switch *ds = p->parent;
 371
 372         if (ds->drv->port_fdb_dump)
 373                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 374
 375         return -EOPNOTSUPP;
 376 }
 377
 378 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 379 {
 380         struct dsa_slave_priv *p = netdev_priv(dev);
 381
 382         if (p->phy != NULL)
 383                 return phy_mii_ioctl(p->phy, ifr, cmd);
 384
 385         return -EOPNOTSUPP;
 386 }
 387
 388 /* Return a bitmask of all ports being currently bridged within a given bridge
 389  * device. Note that on leave, the mask will still return the bitmask of ports
 390  * currently bridged, prior to port removal, and this is exactly what we want.
 391  */
 392 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 393                                   struct net_device *bridge)
 394 {
 395         struct dsa_slave_priv *p;
 396         unsigned int port;
 397         u32 mask = 0;
 398
 399         for (port = 0; port < DSA_MAX_PORTS; port++) {
 400                 if (!dsa_is_port_initialized(ds, port))
 401                         continue;
 402
 403                 p = netdev_priv(ds->ports[port]);
 404
 405                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 406                     p->bridge_dev == bridge)
 407                         mask |= 1 << port;
 408         }
 409
 410         return mask;
 411 }
 412
 413 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 414 {
 415         struct dsa_slave_priv *p = netdev_priv(dev);
 416         struct dsa_switch *ds = p->parent;
 417         int ret = -EOPNOTSUPP;
 418
 419         if (ds->drv->port_stp_update)
 420                 ret = ds->drv->port_stp_update(ds, p->port, state);
 421
 422         return ret;
 423 }
 424
 425 static int dsa_slave_port_attr_set(struct net_device *dev,
 426                                    const struct switchdev_attr *attr,
 427                                    struct switchdev_trans *trans)
 428 {
 429         struct dsa_slave_priv *p = netdev_priv(dev);
 430         struct dsa_switch *ds = p->parent;
 431         int ret;
 432
 433         switch (attr->id) {
 434         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 435                 if (switchdev_trans_ph_prepare(trans))
 436                         ret = ds->drv->port_stp_update ? 0 : -EOPNOTSUPP;
 437                 else
 438                         ret = ds->drv->port_stp_update(ds, p->port,
 439                                                        attr->u.stp_state);
 440                 break;
 441         default:
 442                 ret = -EOPNOTSUPP;
 443                 break;
 444         }
 445
 446         return ret;
 447 }
 448
 449 static int dsa_slave_port_obj_add(struct net_device *dev,
 450                                   const struct switchdev_obj *obj,
 451                                   struct switchdev_trans *trans)
 452 {
 453         int err;
 454
 455         /* For the prepare phase, ensure the full set of changes is feasable in
 456          * one go in order to signal a failure properly. If an operation is not
 457          * supported, return -EOPNOTSUPP.
 458          */
 459
 460         switch (obj->id) {
 461         case SWITCHDEV_OBJ_ID_PORT_FDB:
 462                 err = dsa_slave_port_fdb_add(dev,
 463                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 464                                              trans);
 465                 break;
 466         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 467                 err = dsa_slave_port_vlan_add(dev,
 468                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 469                                               trans);
 470                 break;
 471         default:
 472                 err = -EOPNOTSUPP;
 473                 break;
 474         }
 475
 476         return err;
 477 }
 478
 479 static int dsa_slave_port_obj_del(struct net_device *dev,
 480                                   const struct switchdev_obj *obj)
 481 {
 482         int err;
 483
 484         switch (obj->id) {
 485         case SWITCHDEV_OBJ_ID_PORT_FDB:
 486                 err = dsa_slave_port_fdb_del(dev,
 487                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 488                 break;
 489         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 490                 err = dsa_slave_port_vlan_del(dev,
 491                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 492                 break;
 493         default:
 494                 err = -EOPNOTSUPP;
 495                 break;
 496         }
 497
 498         return err;
 499 }
 500
 501 static int dsa_slave_port_obj_dump(struct net_device *dev,
 502                                    struct switchdev_obj *obj,
 503                                    switchdev_obj_dump_cb_t *cb)
 504 {
 505         int err;
 506
 507         switch (obj->id) {
 508         case SWITCHDEV_OBJ_ID_PORT_FDB:
 509                 err = dsa_slave_port_fdb_dump(dev,
 510                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 511                                               cb);
 512                 break;
 513         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 514                 err = dsa_slave_port_vlan_dump(dev,
 515                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 516                                                cb);
 517                 break;
 518         default:
 519                 err = -EOPNOTSUPP;
 520                 break;
 521         }
 522
 523         return err;
 524 }
 525
 526 static int dsa_slave_bridge_port_join(struct net_device *dev,
 527                                       struct net_device *br)
 528 {
 529         struct dsa_slave_priv *p = netdev_priv(dev);
 530         struct dsa_switch *ds = p->parent;
 531         int ret = -EOPNOTSUPP;
 532
 533         p->bridge_dev = br;
 534
 535         if (ds->drv->port_join_bridge)
 536                 ret = ds->drv->port_join_bridge(ds, p->port,
 537                                                 dsa_slave_br_port_mask(ds, br));
 538
 539         return ret;
 540 }
 541
 542 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 543 {
 544         struct dsa_slave_priv *p = netdev_priv(dev);
 545         struct dsa_switch *ds = p->parent;
 546         int ret = -EOPNOTSUPP;
 547
 548
 549         if (ds->drv->port_leave_bridge)
 550                 ret = ds->drv->port_leave_bridge(ds, p->port,
 551                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 552
 553         p->bridge_dev = NULL;
 554
 555         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 556          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 557          */
 558         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 559
 560         return ret;
 561 }
 562
 563 static int dsa_slave_port_attr_get(struct net_device *dev,
 564                                    struct switchdev_attr *attr)
 565 {
 566         struct dsa_slave_priv *p = netdev_priv(dev);
 567         struct dsa_switch *ds = p->parent;
 568
 569         switch (attr->id) {
 570         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 571                 attr->u.ppid.id_len = sizeof(ds->index);
 572                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 573                 break;
 574         default:
 575                 return -EOPNOTSUPP;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 582                                                struct sk_buff *skb)
 583 {
 584 #ifdef CONFIG_NET_POLL_CONTROLLER
 585         if (p->netpoll)
 586                 netpoll_send_skb(p->netpoll, skb);
 587 #else
 588         BUG();
 589 #endif
 590         return NETDEV_TX_OK;
 591 }
 592
 593 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 594 {
 595         struct dsa_slave_priv *p = netdev_priv(dev);
 596         struct sk_buff *nskb;
 597
 598         dev->stats.tx_packets++;
 599         dev->stats.tx_bytes += skb->len;
 600
 601         /* Transmit function may have to reallocate the original SKB */
 602         nskb = p->xmit(skb, dev);
 603         if (!nskb)
 604                 return NETDEV_TX_OK;
 605
 606         /* SKB for netpoll still need to be mangled with the protocol-specific
 607          * tag to be successfully transmitted
 608          */
 609         if (unlikely(netpoll_tx_running(dev)))
 610                 return dsa_netpoll_send_skb(p, nskb);
 611
 612         /* Queue the SKB for transmission on the parent interface, but
 613          * do not modify its EtherType
 614          */
 615         nskb->dev = p->parent->dst->master_netdev;
 616         dev_queue_xmit(nskb);
 617
 618         return NETDEV_TX_OK;
 619 }
 620
 621 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 622                                             struct net_device *dev)
 623 {
 624         /* Just return the original SKB */
 625         return skb;
 626 }
 627
 628
 629 /* ethtool operations *******************************************************/
 630 static int
 631 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 632 {
 633         struct dsa_slave_priv *p = netdev_priv(dev);
 634         int err;
 635
 636         err = -EOPNOTSUPP;
 637         if (p->phy != NULL) {
 638                 err = phy_read_status(p->phy);
 639                 if (err == 0)
 640                         err = phy_ethtool_gset(p->phy, cmd);
 641         }
 642
 643         return err;
 644 }
 645
 646 static int
 647 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 648 {
 649         struct dsa_slave_priv *p = netdev_priv(dev);
 650
 651         if (p->phy != NULL)
 652                 return phy_ethtool_sset(p->phy, cmd);
 653
 654         return -EOPNOTSUPP;
 655 }
 656
 657 static void dsa_slave_get_drvinfo(struct net_device *dev,
 658                                   struct ethtool_drvinfo *drvinfo)
 659 {
 660         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 661         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 662         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 663         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 664 }
 665
 666 static int dsa_slave_get_regs_len(struct net_device *dev)
 667 {
 668         struct dsa_slave_priv *p = netdev_priv(dev);
 669         struct dsa_switch *ds = p->parent;
 670
 671         if (ds->drv->get_regs_len)
 672                 return ds->drv->get_regs_len(ds, p->port);
 673
 674         return -EOPNOTSUPP;
 675 }
 676
 677 static void
 678 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 679 {
 680         struct dsa_slave_priv *p = netdev_priv(dev);
 681         struct dsa_switch *ds = p->parent;
 682
 683         if (ds->drv->get_regs)
 684                 ds->drv->get_regs(ds, p->port, regs, _p);
 685 }
 686
 687 static int dsa_slave_nway_reset(struct net_device *dev)
 688 {
 689         struct dsa_slave_priv *p = netdev_priv(dev);
 690
 691         if (p->phy != NULL)
 692                 return genphy_restart_aneg(p->phy);
 693
 694         return -EOPNOTSUPP;
 695 }
 696
 697 static u32 dsa_slave_get_link(struct net_device *dev)
 698 {
 699         struct dsa_slave_priv *p = netdev_priv(dev);
 700
 701         if (p->phy != NULL) {
 702                 genphy_update_link(p->phy);
 703                 return p->phy->link;
 704         }
 705
 706         return -EOPNOTSUPP;
 707 }
 708
 709 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 710 {
 711         struct dsa_slave_priv *p = netdev_priv(dev);
 712         struct dsa_switch *ds = p->parent;
 713
 714         if (ds->pd->eeprom_len)
 715                 return ds->pd->eeprom_len;
 716
 717         if (ds->drv->get_eeprom_len)
 718                 return ds->drv->get_eeprom_len(ds);
 719
 720         return 0;
 721 }
 722
 723 static int dsa_slave_get_eeprom(struct net_device *dev,
 724                                 struct ethtool_eeprom *eeprom, u8 *data)
 725 {
 726         struct dsa_slave_priv *p = netdev_priv(dev);
 727         struct dsa_switch *ds = p->parent;
 728
 729         if (ds->drv->get_eeprom)
 730                 return ds->drv->get_eeprom(ds, eeprom, data);
 731
 732         return -EOPNOTSUPP;
 733 }
 734
 735 static int dsa_slave_set_eeprom(struct net_device *dev,
 736                                 struct ethtool_eeprom *eeprom, u8 *data)
 737 {
 738         struct dsa_slave_priv *p = netdev_priv(dev);
 739         struct dsa_switch *ds = p->parent;
 740
 741         if (ds->drv->set_eeprom)
 742                 return ds->drv->set_eeprom(ds, eeprom, data);
 743
 744         return -EOPNOTSUPP;
 745 }
 746
 747 static void dsa_slave_get_strings(struct net_device *dev,
 748                                   uint32_t stringset, uint8_t *data)
 749 {
 750         struct dsa_slave_priv *p = netdev_priv(dev);
 751         struct dsa_switch *ds = p->parent;
 752
 753         if (stringset == ETH_SS_STATS) {
 754                 int len = ETH_GSTRING_LEN;
 755
 756                 strncpy(data, "tx_packets", len);
 757                 strncpy(data + len, "tx_bytes", len);
 758                 strncpy(data + 2 * len, "rx_packets", len);
 759                 strncpy(data + 3 * len, "rx_bytes", len);
 760                 if (ds->drv->get_strings != NULL)
 761                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 762         }
 763 }
 764
 765 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 766                                         struct ethtool_stats *stats,
 767                                         uint64_t *data)
 768 {
 769         struct dsa_slave_priv *p = netdev_priv(dev);
 770         struct dsa_switch *ds = p->parent;
 771
 772         data[0] = p->dev->stats.tx_packets;
 773         data[1] = p->dev->stats.tx_bytes;
 774         data[2] = p->dev->stats.rx_packets;
 775         data[3] = p->dev->stats.rx_bytes;
 776         if (ds->drv->get_ethtool_stats != NULL)
 777                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 778 }
 779
 780 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 781 {
 782         struct dsa_slave_priv *p = netdev_priv(dev);
 783         struct dsa_switch *ds = p->parent;
 784
 785         if (sset == ETH_SS_STATS) {
 786                 int count;
 787
 788                 count = 4;
 789                 if (ds->drv->get_sset_count != NULL)
 790                         count += ds->drv->get_sset_count(ds);
 791
 792                 return count;
 793         }
 794
 795         return -EOPNOTSUPP;
 796 }
 797
 798 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 799 {
 800         struct dsa_slave_priv *p = netdev_priv(dev);
 801         struct dsa_switch *ds = p->parent;
 802
 803         if (ds->drv->get_wol)
 804                 ds->drv->get_wol(ds, p->port, w);
 805 }
 806
 807 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 808 {
 809         struct dsa_slave_priv *p = netdev_priv(dev);
 810         struct dsa_switch *ds = p->parent;
 811         int ret = -EOPNOTSUPP;
 812
 813         if (ds->drv->set_wol)
 814                 ret = ds->drv->set_wol(ds, p->port, w);
 815
 816         return ret;
 817 }
 818
 819 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 820 {
 821         struct dsa_slave_priv *p = netdev_priv(dev);
 822         struct dsa_switch *ds = p->parent;
 823         int ret;
 824
 825         if (!ds->drv->set_eee)
 826                 return -EOPNOTSUPP;
 827
 828         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 829         if (ret)
 830                 return ret;
 831
 832         if (p->phy)
 833                 ret = phy_ethtool_set_eee(p->phy, e);
 834
 835         return ret;
 836 }
 837
 838 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 839 {
 840         struct dsa_slave_priv *p = netdev_priv(dev);
 841         struct dsa_switch *ds = p->parent;
 842         int ret;
 843
 844         if (!ds->drv->get_eee)
 845                 return -EOPNOTSUPP;
 846
 847         ret = ds->drv->get_eee(ds, p->port, e);
 848         if (ret)
 849                 return ret;
 850
 851         if (p->phy)
 852                 ret = phy_ethtool_get_eee(p->phy, e);
 853
 854         return ret;
 855 }
 856
 857 #ifdef CONFIG_NET_POLL_CONTROLLER
 858 static int dsa_slave_netpoll_setup(struct net_device *dev,
 859                                    struct netpoll_info *ni)
 860 {
 861         struct dsa_slave_priv *p = netdev_priv(dev);
 862         struct dsa_switch *ds = p->parent;
 863         struct net_device *master = ds->dst->master_netdev;
 864         struct netpoll *netpoll;
 865         int err = 0;
 866
 867         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 868         if (!netpoll)
 869                 return -ENOMEM;
 870
 871         err = __netpoll_setup(netpoll, master);
 872         if (err) {
 873                 kfree(netpoll);
 874                 goto out;
 875         }
 876
 877         p->netpoll = netpoll;
 878 out:
 879         return err;
 880 }
 881
 882 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 883 {
 884         struct dsa_slave_priv *p = netdev_priv(dev);
 885         struct netpoll *netpoll = p->netpoll;
 886
 887         if (!netpoll)
 888                 return;
 889
 890         p->netpoll = NULL;
 891
 892         __netpoll_free_async(netpoll);
 893 }
 894
 895 static void dsa_slave_poll_controller(struct net_device *dev)
 896 {
 897 }
 898 #endif
 899
 900 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 901         .get_settings           = dsa_slave_get_settings,
 902         .set_settings           = dsa_slave_set_settings,
 903         .get_drvinfo            = dsa_slave_get_drvinfo,
 904         .get_regs_len           = dsa_slave_get_regs_len,
 905         .get_regs               = dsa_slave_get_regs,
 906         .nway_reset             = dsa_slave_nway_reset,
 907         .get_link               = dsa_slave_get_link,
 908         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 909         .get_eeprom             = dsa_slave_get_eeprom,
 910         .set_eeprom             = dsa_slave_set_eeprom,
 911         .get_strings            = dsa_slave_get_strings,
 912         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 913         .get_sset_count         = dsa_slave_get_sset_count,
 914         .set_wol                = dsa_slave_set_wol,
 915         .get_wol                = dsa_slave_get_wol,
 916         .set_eee                = dsa_slave_set_eee,
 917         .get_eee                = dsa_slave_get_eee,
 918 };
 919
 920 static const struct net_device_ops dsa_slave_netdev_ops = {
 921         .ndo_open               = dsa_slave_open,
 922         .ndo_stop               = dsa_slave_close,
 923         .ndo_start_xmit         = dsa_slave_xmit,
 924         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 925         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 926         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 927         .ndo_fdb_add            = switchdev_port_fdb_add,
 928         .ndo_fdb_del            = switchdev_port_fdb_del,
 929         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 930         .ndo_do_ioctl           = dsa_slave_ioctl,
 931         .ndo_get_iflink         = dsa_slave_get_iflink,
 932 #ifdef CONFIG_NET_POLL_CONTROLLER
 933         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 934         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 935         .ndo_poll_controller    = dsa_slave_poll_controller,
 936 #endif
 937         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 938         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 939         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 940 };
 941
 942 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 943         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 944         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 945         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 946         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 947         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 948 };
 949
 950 static struct device_type dsa_type = {
 951         .name   = "dsa",
 952 };
 953
 954 static void dsa_slave_adjust_link(struct net_device *dev)
 955 {
 956         struct dsa_slave_priv *p = netdev_priv(dev);
 957         struct dsa_switch *ds = p->parent;
 958         unsigned int status_changed = 0;
 959
 960         if (p->old_link != p->phy->link) {
 961                 status_changed = 1;
 962                 p->old_link = p->phy->link;
 963         }
 964
 965         if (p->old_duplex != p->phy->duplex) {
 966                 status_changed = 1;
 967                 p->old_duplex = p->phy->duplex;
 968         }
 969
 970         if (p->old_pause != p->phy->pause) {
 971                 status_changed = 1;
 972                 p->old_pause = p->phy->pause;
 973         }
 974
 975         if (ds->drv->adjust_link && status_changed)
 976                 ds->drv->adjust_link(ds, p->port, p->phy);
 977
 978         if (status_changed)
 979                 phy_print_status(p->phy);
 980 }
 981
 982 static int dsa_slave_fixed_link_update(struct net_device *dev,
 983                                        struct fixed_phy_status *status)
 984 {
 985         struct dsa_slave_priv *p = netdev_priv(dev);
 986         struct dsa_switch *ds = p->parent;
 987
 988         if (ds->drv->fixed_link_update)
 989                 ds->drv->fixed_link_update(ds, p->port, status);
 990
 991         return 0;
 992 }
 993
 994 /* slave device setup *******************************************************/
 995 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 996                                  struct net_device *slave_dev,
 997                                  int addr)
 998 {
 999         struct dsa_switch *ds = p->parent;
1000
1001         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1002         if (!p->phy) {
1003                 netdev_err(slave_dev, "no phy at %d\n", addr);
1004                 return -ENODEV;
1005         }
1006
1007         /* Use already configured phy mode */
1008         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1009                 p->phy_interface = p->phy->interface;
1010         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1011                            p->phy_interface);
1012
1013         return 0;
1014 }
1015
1016 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1017                                 struct net_device *slave_dev)
1018 {
1019         struct dsa_switch *ds = p->parent;
1020         struct dsa_chip_data *cd = ds->pd;
1021         struct device_node *phy_dn, *port_dn;
1022         bool phy_is_fixed = false;
1023         u32 phy_flags = 0;
1024         int mode, ret;
1025
1026         port_dn = cd->port_dn[p->port];
1027         mode = of_get_phy_mode(port_dn);
1028         if (mode < 0)
1029                 mode = PHY_INTERFACE_MODE_NA;
1030         p->phy_interface = mode;
1031
1032         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1033         if (of_phy_is_fixed_link(port_dn)) {
1034                 /* In the case of a fixed PHY, the DT node associated
1035                  * to the fixed PHY is the Port DT node
1036                  */
1037                 ret = of_phy_register_fixed_link(port_dn);
1038                 if (ret) {
1039                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1040                         return ret;
1041                 }
1042                 phy_is_fixed = true;
1043                 phy_dn = port_dn;
1044         }
1045
1046         if (ds->drv->get_phy_flags)
1047                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1048
1049         if (phy_dn) {
1050                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1051
1052                 /* If this PHY address is part of phys_mii_mask, which means
1053                  * that we need to divert reads and writes to/from it, then we
1054                  * want to bind this device using the slave MII bus created by
1055                  * DSA to make that happen.
1056                  */
1057                 if (!phy_is_fixed && phy_id >= 0 &&
1058                     (ds->phys_mii_mask & (1 << phy_id))) {
1059                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1060                         if (ret) {
1061                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1062                                 return ret;
1063                         }
1064                 } else {
1065                         p->phy = of_phy_connect(slave_dev, phy_dn,
1066                                                 dsa_slave_adjust_link,
1067                                                 phy_flags,
1068                                                 p->phy_interface);
1069                 }
1070         }
1071
1072         if (p->phy && phy_is_fixed)
1073                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1074
1075         /* We could not connect to a designated PHY, so use the switch internal
1076          * MDIO bus instead
1077          */
1078         if (!p->phy) {
1079                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1080                 if (ret) {
1081                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1082                         return ret;
1083                 }
1084         }
1085
1086         phy_attached_info(p->phy);
1087
1088         return 0;
1089 }
1090
1091 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1092 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1093                                             struct netdev_queue *txq,
1094                                             void *_unused)
1095 {
1096         lockdep_set_class(&txq->_xmit_lock,
1097                           &dsa_slave_netdev_xmit_lock_key);
1098 }
1099
1100 int dsa_slave_suspend(struct net_device *slave_dev)
1101 {
1102         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1103
1104         if (p->phy) {
1105                 phy_stop(p->phy);
1106                 p->old_pause = -1;
1107                 p->old_link = -1;
1108                 p->old_duplex = -1;
1109                 phy_suspend(p->phy);
1110         }
1111
1112         return 0;
1113 }
1114
1115 int dsa_slave_resume(struct net_device *slave_dev)
1116 {
1117         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1118
1119         netif_device_attach(slave_dev);
1120
1121         if (p->phy) {
1122                 phy_resume(p->phy);
1123                 phy_start(p->phy);
1124         }
1125
1126         return 0;
1127 }
1128
1129 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1130                      int port, char *name)
1131 {
1132         struct net_device *master = ds->dst->master_netdev;
1133         struct net_device *slave_dev;
1134         struct dsa_slave_priv *p;
1135         int ret;
1136
1137         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1138                                  NET_NAME_UNKNOWN, ether_setup);
1139         if (slave_dev == NULL)
1140                 return -ENOMEM;
1141
1142         slave_dev->features = master->vlan_features;
1143         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1144         eth_hw_addr_inherit(slave_dev, master);
1145         slave_dev->priv_flags |= IFF_NO_QUEUE;
1146         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1147         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1148         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1149
1150         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1151                                  NULL);
1152
1153         SET_NETDEV_DEV(slave_dev, parent);
1154         slave_dev->dev.of_node = ds->pd->port_dn[port];
1155         slave_dev->vlan_features = master->vlan_features;
1156
1157         p = netdev_priv(slave_dev);
1158         p->dev = slave_dev;
1159         p->parent = ds;
1160         p->port = port;
1161
1162         switch (ds->dst->tag_protocol) {
1163 #ifdef CONFIG_NET_DSA_TAG_DSA
1164         case DSA_TAG_PROTO_DSA:
1165                 p->xmit = dsa_netdev_ops.xmit;
1166                 break;
1167 #endif
1168 #ifdef CONFIG_NET_DSA_TAG_EDSA
1169         case DSA_TAG_PROTO_EDSA:
1170                 p->xmit = edsa_netdev_ops.xmit;
1171                 break;
1172 #endif
1173 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1174         case DSA_TAG_PROTO_TRAILER:
1175                 p->xmit = trailer_netdev_ops.xmit;
1176                 break;
1177 #endif
1178 #ifdef CONFIG_NET_DSA_TAG_BRCM
1179         case DSA_TAG_PROTO_BRCM:
1180                 p->xmit = brcm_netdev_ops.xmit;
1181                 break;
1182 #endif
1183         default:
1184                 p->xmit = dsa_slave_notag_xmit;
1185                 break;
1186         }
1187
1188         p->old_pause = -1;
1189         p->old_link = -1;
1190         p->old_duplex = -1;
1191
1192         ds->ports[port] = slave_dev;
1193         ret = register_netdev(slave_dev);
1194         if (ret) {
1195                 netdev_err(master, "error %d registering interface %s\n",
1196                            ret, slave_dev->name);
1197                 phy_disconnect(p->phy);
1198                 ds->ports[port] = NULL;
1199                 free_netdev(slave_dev);
1200                 return ret;
1201         }
1202
1203         netif_carrier_off(slave_dev);
1204
1205         ret = dsa_slave_phy_setup(p, slave_dev);
1206         if (ret) {
1207                 netdev_err(master, "error %d setting up slave phy\n", ret);
1208                 free_netdev(slave_dev);
1209                 return ret;
1210         }
1211
1212         return 0;
1213 }
1214
1215 void dsa_slave_destroy(struct net_device *slave_dev)
1216 {
1217         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1218
1219         netif_carrier_off(slave_dev);
1220         if (p->phy)
1221                 phy_disconnect(p->phy);
1222         unregister_netdev(slave_dev);
1223         free_netdev(slave_dev);
1224 }
1225
1226 static bool dsa_slave_dev_check(struct net_device *dev)
1227 {
1228         return dev->netdev_ops == &dsa_slave_netdev_ops;
1229 }
1230
1231 static int dsa_slave_master_changed(struct net_device *dev)
1232 {
1233         struct net_device *master = netdev_master_upper_dev_get(dev);
1234         struct dsa_slave_priv *p = netdev_priv(dev);
1235         int err = 0;
1236
1237         if (master && master->rtnl_link_ops &&
1238             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1239                 err = dsa_slave_bridge_port_join(dev, master);
1240         else if (dsa_port_is_bridged(p))
1241                 err = dsa_slave_bridge_port_leave(dev);
1242
1243         return err;
1244 }
1245
1246 int dsa_slave_netdevice_event(struct notifier_block *unused,
1247                               unsigned long event, void *ptr)
1248 {
1249         struct net_device *dev;
1250         int err = 0;
1251
1252         switch (event) {
1253         case NETDEV_CHANGEUPPER:
1254                 dev = netdev_notifier_info_to_dev(ptr);
1255                 if (!dsa_slave_dev_check(dev))
1256                         goto out;
1257
1258                 err = dsa_slave_master_changed(dev);
1259                 if (err && err != -EOPNOTSUPP)
1260                         netdev_warn(dev, "failed to reflect master change\n");
1261
1262                 break;
1263         }
1264
1265 out:
1266         return NOTIFY_DONE;
1267 }