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 <net/rtnetlink.h>
  19 #include <net/switchdev.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/netpoll.h>
  22 #include "dsa_priv.h"
  23
  24 /* slave mii_bus handling ***************************************************/
  25 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  26 {
  27         struct dsa_switch *ds = bus->priv;
  28
  29         if (ds->phys_mii_mask & (1 << addr))
  30                 return ds->drv->phy_read(ds, addr, reg);
  31
  32         return 0xffff;
  33 }
  34
  35 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  36 {
  37         struct dsa_switch *ds = bus->priv;
  38
  39         if (ds->phys_mii_mask & (1 << addr))
  40                 return ds->drv->phy_write(ds, addr, reg, val);
  41
  42         return 0;
  43 }
  44
  45 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  46 {
  47         ds->slave_mii_bus->priv = (void *)ds;
  48         ds->slave_mii_bus->name = "dsa slave smi";
  49         ds->slave_mii_bus->read = dsa_slave_phy_read;
  50         ds->slave_mii_bus->write = dsa_slave_phy_write;
  51         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  52                         ds->index, ds->pd->sw_addr);
  53         ds->slave_mii_bus->parent = ds->master_dev;
  54         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  55 }
  56
  57
  58 /* slave device handling ****************************************************/
  59 static int dsa_slave_get_iflink(const struct net_device *dev)
  60 {
  61         struct dsa_slave_priv *p = netdev_priv(dev);
  62
  63         return p->parent->dst->master_netdev->ifindex;
  64 }
  65
  66 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  67 {
  68         return !!p->bridge_dev;
  69 }
  70
  71 static int dsa_slave_open(struct net_device *dev)
  72 {
  73         struct dsa_slave_priv *p = netdev_priv(dev);
  74         struct net_device *master = p->parent->dst->master_netdev;
  75         struct dsa_switch *ds = p->parent;
  76         u8 stp_state = dsa_port_is_bridged(p) ?
  77                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  78         int err;
  79
  80         if (!(master->flags & IFF_UP))
  81                 return -ENETDOWN;
  82
  83         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  84                 err = dev_uc_add(master, dev->dev_addr);
  85                 if (err < 0)
  86                         goto out;
  87         }
  88
  89         if (dev->flags & IFF_ALLMULTI) {
  90                 err = dev_set_allmulti(master, 1);
  91                 if (err < 0)
  92                         goto del_unicast;
  93         }
  94         if (dev->flags & IFF_PROMISC) {
  95                 err = dev_set_promiscuity(master, 1);
  96                 if (err < 0)
  97                         goto clear_allmulti;
  98         }
  99
 100         if (ds->drv->port_enable) {
 101                 err = ds->drv->port_enable(ds, p->port, p->phy);
 102                 if (err)
 103                         goto clear_promisc;
 104         }
 105
 106         if (ds->drv->port_stp_update)
 107                 ds->drv->port_stp_update(ds, p->port, stp_state);
 108
 109         if (p->phy)
 110                 phy_start(p->phy);
 111
 112         return 0;
 113
 114 clear_promisc:
 115         if (dev->flags & IFF_PROMISC)
 116                 dev_set_promiscuity(master, -1);
 117 clear_allmulti:
 118         if (dev->flags & IFF_ALLMULTI)
 119                 dev_set_allmulti(master, -1);
 120 del_unicast:
 121         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 122                 dev_uc_del(master, dev->dev_addr);
 123 out:
 124         return err;
 125 }
 126
 127 static int dsa_slave_close(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->dst->master_netdev;
 131         struct dsa_switch *ds = p->parent;
 132
 133         if (p->phy)
 134                 phy_stop(p->phy);
 135
 136         dev_mc_unsync(master, dev);
 137         dev_uc_unsync(master, dev);
 138         if (dev->flags & IFF_ALLMULTI)
 139                 dev_set_allmulti(master, -1);
 140         if (dev->flags & IFF_PROMISC)
 141                 dev_set_promiscuity(master, -1);
 142
 143         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 144                 dev_uc_del(master, dev->dev_addr);
 145
 146         if (ds->drv->port_disable)
 147                 ds->drv->port_disable(ds, p->port, p->phy);
 148
 149         if (ds->drv->port_stp_update)
 150                 ds->drv->port_stp_update(ds, p->port, BR_STATE_DISABLED);
 151
 152         return 0;
 153 }
 154
 155 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 156 {
 157         struct dsa_slave_priv *p = netdev_priv(dev);
 158         struct net_device *master = p->parent->dst->master_netdev;
 159
 160         if (dev->flags & IFF_UP) {
 161                 if (change & IFF_ALLMULTI)
 162                         dev_set_allmulti(master,
 163                                          dev->flags & IFF_ALLMULTI ? 1 : -1);
 164                 if (change & IFF_PROMISC)
 165                         dev_set_promiscuity(master,
 166                                             dev->flags & IFF_PROMISC ? 1 : -1);
 167         }
 168 }
 169
 170 static void dsa_slave_set_rx_mode(struct net_device *dev)
 171 {
 172         struct dsa_slave_priv *p = netdev_priv(dev);
 173         struct net_device *master = p->parent->dst->master_netdev;
 174
 175         dev_mc_sync(master, dev);
 176         dev_uc_sync(master, dev);
 177 }
 178
 179 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 180 {
 181         struct dsa_slave_priv *p = netdev_priv(dev);
 182         struct net_device *master = p->parent->dst->master_netdev;
 183         struct sockaddr *addr = a;
 184         int err;
 185
 186         if (!is_valid_ether_addr(addr->sa_data))
 187                 return -EADDRNOTAVAIL;
 188
 189         if (!(dev->flags & IFF_UP))
 190                 goto out;
 191
 192         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 193                 err = dev_uc_add(master, addr->sa_data);
 194                 if (err < 0)
 195                         return err;
 196         }
 197
 198         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 199                 dev_uc_del(master, dev->dev_addr);
 200
 201 out:
 202         ether_addr_copy(dev->dev_addr, addr->sa_data);
 203
 204         return 0;
 205 }
 206
 207 static int dsa_bridge_check_vlan_range(struct dsa_switch *ds,
 208                                        const struct net_device *bridge,
 209                                        u16 vid_begin, u16 vid_end)
 210 {
 211         struct dsa_slave_priv *p;
 212         struct net_device *dev, *vlan_br;
 213         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 214         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 215         u16 vid;
 216         int member, err;
 217
 218         if (!ds->drv->vlan_getnext || !vid_begin)
 219                 return -EOPNOTSUPP;
 220
 221         vid = vid_begin - 1;
 222
 223         do {
 224                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 225                 if (err)
 226                         break;
 227
 228                 if (vid > vid_end)
 229                         break;
 230
 231                 member = find_first_bit(members, DSA_MAX_PORTS);
 232                 if (member == DSA_MAX_PORTS)
 233                         continue;
 234
 235                 dev = ds->ports[member];
 236                 p = netdev_priv(dev);
 237                 vlan_br = p->bridge_dev;
 238                 if (vlan_br == bridge)
 239                         continue;
 240
 241                 netdev_dbg(vlan_br, "hardware VLAN %d already in use\n", vid);
 242                 return -EOPNOTSUPP;
 243         } while (vid < vid_end);
 244
 245         return err == -ENOENT ? 0 : err;
 246 }
 247
 248 static int dsa_slave_port_vlan_add(struct net_device *dev,
 249                                    const struct switchdev_obj_port_vlan *vlan,
 250                                    struct switchdev_trans *trans)
 251 {
 252         struct dsa_slave_priv *p = netdev_priv(dev);
 253         struct dsa_switch *ds = p->parent;
 254         int err;
 255
 256         if (switchdev_trans_ph_prepare(trans)) {
 257                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 258                         return -EOPNOTSUPP;
 259
 260                 /* If the requested port doesn't belong to the same bridge as
 261                  * the VLAN members, fallback to software VLAN (hopefully).
 262                  */
 263                 err = dsa_bridge_check_vlan_range(ds, p->bridge_dev,
 264                                                   vlan->vid_begin,
 265                                                   vlan->vid_end);
 266                 if (err)
 267                         return err;
 268
 269                 err = ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 270                 if (err)
 271                         return err;
 272         } else {
 273                 err = ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 274                 if (err)
 275                         return err;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int dsa_slave_port_vlan_del(struct net_device *dev,
 282                                    const struct switchdev_obj_port_vlan *vlan)
 283 {
 284         struct dsa_slave_priv *p = netdev_priv(dev);
 285         struct dsa_switch *ds = p->parent;
 286
 287         if (!ds->drv->port_vlan_del)
 288                 return -EOPNOTSUPP;
 289
 290         return ds->drv->port_vlan_del(ds, p->port, vlan);
 291 }
 292
 293 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 294                                     struct switchdev_obj_port_vlan *vlan,
 295                                     switchdev_obj_dump_cb_t *cb)
 296 {
 297         struct dsa_slave_priv *p = netdev_priv(dev);
 298         struct dsa_switch *ds = p->parent;
 299         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 300         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 301         u16 pvid, vid = 0;
 302         int err;
 303
 304         if (!ds->drv->vlan_getnext || !ds->drv->port_pvid_get)
 305                 return -EOPNOTSUPP;
 306
 307         err = ds->drv->port_pvid_get(ds, p->port, &pvid);
 308         if (err)
 309                 return err;
 310
 311         for (;;) {
 312                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 313                 if (err)
 314                         break;
 315
 316                 if (!test_bit(p->port, members))
 317                         continue;
 318
 319                 memset(vlan, 0, sizeof(*vlan));
 320                 vlan->vid_begin = vlan->vid_end = vid;
 321
 322                 if (vid == pvid)
 323                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 324
 325                 if (test_bit(p->port, untagged))
 326                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 327
 328                 err = cb(&vlan->obj);
 329                 if (err)
 330                         break;
 331         }
 332
 333         return err == -ENOENT ? 0 : err;
 334 }
 335
 336 static int dsa_slave_port_fdb_add(struct net_device *dev,
 337                                   const struct switchdev_obj_port_fdb *fdb,
 338                                   struct switchdev_trans *trans)
 339 {
 340         struct dsa_slave_priv *p = netdev_priv(dev);
 341         struct dsa_switch *ds = p->parent;
 342         int ret;
 343
 344         if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 345                 return -EOPNOTSUPP;
 346
 347         if (switchdev_trans_ph_prepare(trans))
 348                 ret = ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 349         else
 350                 ret = ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 351
 352         return ret;
 353 }
 354
 355 static int dsa_slave_port_fdb_del(struct net_device *dev,
 356                                   const struct switchdev_obj_port_fdb *fdb)
 357 {
 358         struct dsa_slave_priv *p = netdev_priv(dev);
 359         struct dsa_switch *ds = p->parent;
 360         int ret = -EOPNOTSUPP;
 361
 362         if (ds->drv->port_fdb_del)
 363                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 364
 365         return ret;
 366 }
 367
 368 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 369                                    struct switchdev_obj_port_fdb *fdb,
 370                                    switchdev_obj_dump_cb_t *cb)
 371 {
 372         struct dsa_slave_priv *p = netdev_priv(dev);
 373         struct dsa_switch *ds = p->parent;
 374
 375         if (ds->drv->port_fdb_dump)
 376                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 377
 378         return -EOPNOTSUPP;
 379 }
 380
 381 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 382 {
 383         struct dsa_slave_priv *p = netdev_priv(dev);
 384
 385         if (p->phy != NULL)
 386                 return phy_mii_ioctl(p->phy, ifr, cmd);
 387
 388         return -EOPNOTSUPP;
 389 }
 390
 391 /* Return a bitmask of all ports being currently bridged within a given bridge
 392  * device. Note that on leave, the mask will still return the bitmask of ports
 393  * currently bridged, prior to port removal, and this is exactly what we want.
 394  */
 395 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 396                                   struct net_device *bridge)
 397 {
 398         struct dsa_slave_priv *p;
 399         unsigned int port;
 400         u32 mask = 0;
 401
 402         for (port = 0; port < DSA_MAX_PORTS; port++) {
 403                 if (!dsa_is_port_initialized(ds, port))
 404                         continue;
 405
 406                 p = netdev_priv(ds->ports[port]);
 407
 408                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 409                     p->bridge_dev == bridge)
 410                         mask |= 1 << port;
 411         }
 412
 413         return mask;
 414 }
 415
 416 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 417 {
 418         struct dsa_slave_priv *p = netdev_priv(dev);
 419         struct dsa_switch *ds = p->parent;
 420         int ret = -EOPNOTSUPP;
 421
 422         if (ds->drv->port_stp_update)
 423                 ret = ds->drv->port_stp_update(ds, p->port, state);
 424
 425         return ret;
 426 }
 427
 428 static int dsa_slave_port_attr_set(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->parent;
 434         int ret;
 435
 436         switch (attr->id) {
 437         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 438                 if (switchdev_trans_ph_prepare(trans))
 439                         ret = ds->drv->port_stp_update ? 0 : -EOPNOTSUPP;
 440                 else
 441                         ret = ds->drv->port_stp_update(ds, p->port,
 442                                                        attr->u.stp_state);
 443                 break;
 444         default:
 445                 ret = -EOPNOTSUPP;
 446                 break;
 447         }
 448
 449         return ret;
 450 }
 451
 452 static int dsa_slave_port_obj_add(struct net_device *dev,
 453                                   const struct switchdev_obj *obj,
 454                                   struct switchdev_trans *trans)
 455 {
 456         int err;
 457
 458         /* For the prepare phase, ensure the full set of changes is feasable in
 459          * one go in order to signal a failure properly. If an operation is not
 460          * supported, return -EOPNOTSUPP.
 461          */
 462
 463         switch (obj->id) {
 464         case SWITCHDEV_OBJ_ID_PORT_FDB:
 465                 err = dsa_slave_port_fdb_add(dev,
 466                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 467                                              trans);
 468                 break;
 469         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 470                 err = dsa_slave_port_vlan_add(dev,
 471                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 472                                               trans);
 473                 break;
 474         default:
 475                 err = -EOPNOTSUPP;
 476                 break;
 477         }
 478
 479         return err;
 480 }
 481
 482 static int dsa_slave_port_obj_del(struct net_device *dev,
 483                                   const struct switchdev_obj *obj)
 484 {
 485         int err;
 486
 487         switch (obj->id) {
 488         case SWITCHDEV_OBJ_ID_PORT_FDB:
 489                 err = dsa_slave_port_fdb_del(dev,
 490                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 491                 break;
 492         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 493                 err = dsa_slave_port_vlan_del(dev,
 494                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 495                 break;
 496         default:
 497                 err = -EOPNOTSUPP;
 498                 break;
 499         }
 500
 501         return err;
 502 }
 503
 504 static int dsa_slave_port_obj_dump(struct net_device *dev,
 505                                    struct switchdev_obj *obj,
 506                                    switchdev_obj_dump_cb_t *cb)
 507 {
 508         int err;
 509
 510         switch (obj->id) {
 511         case SWITCHDEV_OBJ_ID_PORT_FDB:
 512                 err = dsa_slave_port_fdb_dump(dev,
 513                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 514                                               cb);
 515                 break;
 516         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 517                 err = dsa_slave_port_vlan_dump(dev,
 518                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 519                                                cb);
 520                 break;
 521         default:
 522                 err = -EOPNOTSUPP;
 523                 break;
 524         }
 525
 526         return err;
 527 }
 528
 529 static int dsa_slave_bridge_port_join(struct net_device *dev,
 530                                       struct net_device *br)
 531 {
 532         struct dsa_slave_priv *p = netdev_priv(dev);
 533         struct dsa_switch *ds = p->parent;
 534         int ret = -EOPNOTSUPP;
 535
 536         p->bridge_dev = br;
 537
 538         if (ds->drv->port_join_bridge)
 539                 ret = ds->drv->port_join_bridge(ds, p->port,
 540                                                 dsa_slave_br_port_mask(ds, br));
 541
 542         return ret;
 543 }
 544
 545 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 546 {
 547         struct dsa_slave_priv *p = netdev_priv(dev);
 548         struct dsa_switch *ds = p->parent;
 549         int ret = -EOPNOTSUPP;
 550
 551
 552         if (ds->drv->port_leave_bridge)
 553                 ret = ds->drv->port_leave_bridge(ds, p->port,
 554                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 555
 556         p->bridge_dev = NULL;
 557
 558         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 559          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 560          */
 561         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 562
 563         return ret;
 564 }
 565
 566 static int dsa_slave_port_attr_get(struct net_device *dev,
 567                                    struct switchdev_attr *attr)
 568 {
 569         struct dsa_slave_priv *p = netdev_priv(dev);
 570         struct dsa_switch *ds = p->parent;
 571
 572         switch (attr->id) {
 573         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 574                 attr->u.ppid.id_len = sizeof(ds->index);
 575                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 576                 break;
 577         default:
 578                 return -EOPNOTSUPP;
 579         }
 580
 581         return 0;
 582 }
 583
 584 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 585                                                struct sk_buff *skb)
 586 {
 587 #ifdef CONFIG_NET_POLL_CONTROLLER
 588         if (p->netpoll)
 589                 netpoll_send_skb(p->netpoll, skb);
 590 #else
 591         BUG();
 592 #endif
 593         return NETDEV_TX_OK;
 594 }
 595
 596 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 597 {
 598         struct dsa_slave_priv *p = netdev_priv(dev);
 599         struct sk_buff *nskb;
 600
 601         dev->stats.tx_packets++;
 602         dev->stats.tx_bytes += skb->len;
 603
 604         /* Transmit function may have to reallocate the original SKB */
 605         nskb = p->xmit(skb, dev);
 606         if (!nskb)
 607                 return NETDEV_TX_OK;
 608
 609         /* SKB for netpoll still need to be mangled with the protocol-specific
 610          * tag to be successfully transmitted
 611          */
 612         if (unlikely(netpoll_tx_running(dev)))
 613                 return dsa_netpoll_send_skb(p, nskb);
 614
 615         /* Queue the SKB for transmission on the parent interface, but
 616          * do not modify its EtherType
 617          */
 618         nskb->dev = p->parent->dst->master_netdev;
 619         dev_queue_xmit(nskb);
 620
 621         return NETDEV_TX_OK;
 622 }
 623
 624 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 625                                             struct net_device *dev)
 626 {
 627         /* Just return the original SKB */
 628         return skb;
 629 }
 630
 631
 632 /* ethtool operations *******************************************************/
 633 static int
 634 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 635 {
 636         struct dsa_slave_priv *p = netdev_priv(dev);
 637         int err;
 638
 639         err = -EOPNOTSUPP;
 640         if (p->phy != NULL) {
 641                 err = phy_read_status(p->phy);
 642                 if (err == 0)
 643                         err = phy_ethtool_gset(p->phy, cmd);
 644         }
 645
 646         return err;
 647 }
 648
 649 static int
 650 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 651 {
 652         struct dsa_slave_priv *p = netdev_priv(dev);
 653
 654         if (p->phy != NULL)
 655                 return phy_ethtool_sset(p->phy, cmd);
 656
 657         return -EOPNOTSUPP;
 658 }
 659
 660 static void dsa_slave_get_drvinfo(struct net_device *dev,
 661                                   struct ethtool_drvinfo *drvinfo)
 662 {
 663         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 664         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 665         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 666         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 667 }
 668
 669 static int dsa_slave_get_regs_len(struct net_device *dev)
 670 {
 671         struct dsa_slave_priv *p = netdev_priv(dev);
 672         struct dsa_switch *ds = p->parent;
 673
 674         if (ds->drv->get_regs_len)
 675                 return ds->drv->get_regs_len(ds, p->port);
 676
 677         return -EOPNOTSUPP;
 678 }
 679
 680 static void
 681 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 682 {
 683         struct dsa_slave_priv *p = netdev_priv(dev);
 684         struct dsa_switch *ds = p->parent;
 685
 686         if (ds->drv->get_regs)
 687                 ds->drv->get_regs(ds, p->port, regs, _p);
 688 }
 689
 690 static int dsa_slave_nway_reset(struct net_device *dev)
 691 {
 692         struct dsa_slave_priv *p = netdev_priv(dev);
 693
 694         if (p->phy != NULL)
 695                 return genphy_restart_aneg(p->phy);
 696
 697         return -EOPNOTSUPP;
 698 }
 699
 700 static u32 dsa_slave_get_link(struct net_device *dev)
 701 {
 702         struct dsa_slave_priv *p = netdev_priv(dev);
 703
 704         if (p->phy != NULL) {
 705                 genphy_update_link(p->phy);
 706                 return p->phy->link;
 707         }
 708
 709         return -EOPNOTSUPP;
 710 }
 711
 712 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 713 {
 714         struct dsa_slave_priv *p = netdev_priv(dev);
 715         struct dsa_switch *ds = p->parent;
 716
 717         if (ds->pd->eeprom_len)
 718                 return ds->pd->eeprom_len;
 719
 720         if (ds->drv->get_eeprom_len)
 721                 return ds->drv->get_eeprom_len(ds);
 722
 723         return 0;
 724 }
 725
 726 static int dsa_slave_get_eeprom(struct net_device *dev,
 727                                 struct ethtool_eeprom *eeprom, u8 *data)
 728 {
 729         struct dsa_slave_priv *p = netdev_priv(dev);
 730         struct dsa_switch *ds = p->parent;
 731
 732         if (ds->drv->get_eeprom)
 733                 return ds->drv->get_eeprom(ds, eeprom, data);
 734
 735         return -EOPNOTSUPP;
 736 }
 737
 738 static int dsa_slave_set_eeprom(struct net_device *dev,
 739                                 struct ethtool_eeprom *eeprom, u8 *data)
 740 {
 741         struct dsa_slave_priv *p = netdev_priv(dev);
 742         struct dsa_switch *ds = p->parent;
 743
 744         if (ds->drv->set_eeprom)
 745                 return ds->drv->set_eeprom(ds, eeprom, data);
 746
 747         return -EOPNOTSUPP;
 748 }
 749
 750 static void dsa_slave_get_strings(struct net_device *dev,
 751                                   uint32_t stringset, uint8_t *data)
 752 {
 753         struct dsa_slave_priv *p = netdev_priv(dev);
 754         struct dsa_switch *ds = p->parent;
 755
 756         if (stringset == ETH_SS_STATS) {
 757                 int len = ETH_GSTRING_LEN;
 758
 759                 strncpy(data, "tx_packets", len);
 760                 strncpy(data + len, "tx_bytes", len);
 761                 strncpy(data + 2 * len, "rx_packets", len);
 762                 strncpy(data + 3 * len, "rx_bytes", len);
 763                 if (ds->drv->get_strings != NULL)
 764                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 765         }
 766 }
 767
 768 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 769                                         struct ethtool_stats *stats,
 770                                         uint64_t *data)
 771 {
 772         struct dsa_slave_priv *p = netdev_priv(dev);
 773         struct dsa_switch *ds = p->parent;
 774
 775         data[0] = p->dev->stats.tx_packets;
 776         data[1] = p->dev->stats.tx_bytes;
 777         data[2] = p->dev->stats.rx_packets;
 778         data[3] = p->dev->stats.rx_bytes;
 779         if (ds->drv->get_ethtool_stats != NULL)
 780                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 781 }
 782
 783 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 784 {
 785         struct dsa_slave_priv *p = netdev_priv(dev);
 786         struct dsa_switch *ds = p->parent;
 787
 788         if (sset == ETH_SS_STATS) {
 789                 int count;
 790
 791                 count = 4;
 792                 if (ds->drv->get_sset_count != NULL)
 793                         count += ds->drv->get_sset_count(ds);
 794
 795                 return count;
 796         }
 797
 798         return -EOPNOTSUPP;
 799 }
 800
 801 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 802 {
 803         struct dsa_slave_priv *p = netdev_priv(dev);
 804         struct dsa_switch *ds = p->parent;
 805
 806         if (ds->drv->get_wol)
 807                 ds->drv->get_wol(ds, p->port, w);
 808 }
 809
 810 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 811 {
 812         struct dsa_slave_priv *p = netdev_priv(dev);
 813         struct dsa_switch *ds = p->parent;
 814         int ret = -EOPNOTSUPP;
 815
 816         if (ds->drv->set_wol)
 817                 ret = ds->drv->set_wol(ds, p->port, w);
 818
 819         return ret;
 820 }
 821
 822 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 823 {
 824         struct dsa_slave_priv *p = netdev_priv(dev);
 825         struct dsa_switch *ds = p->parent;
 826         int ret;
 827
 828         if (!ds->drv->set_eee)
 829                 return -EOPNOTSUPP;
 830
 831         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 832         if (ret)
 833                 return ret;
 834
 835         if (p->phy)
 836                 ret = phy_ethtool_set_eee(p->phy, e);
 837
 838         return ret;
 839 }
 840
 841 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 842 {
 843         struct dsa_slave_priv *p = netdev_priv(dev);
 844         struct dsa_switch *ds = p->parent;
 845         int ret;
 846
 847         if (!ds->drv->get_eee)
 848                 return -EOPNOTSUPP;
 849
 850         ret = ds->drv->get_eee(ds, p->port, e);
 851         if (ret)
 852                 return ret;
 853
 854         if (p->phy)
 855                 ret = phy_ethtool_get_eee(p->phy, e);
 856
 857         return ret;
 858 }
 859
 860 #ifdef CONFIG_NET_POLL_CONTROLLER
 861 static int dsa_slave_netpoll_setup(struct net_device *dev,
 862                                    struct netpoll_info *ni)
 863 {
 864         struct dsa_slave_priv *p = netdev_priv(dev);
 865         struct dsa_switch *ds = p->parent;
 866         struct net_device *master = ds->dst->master_netdev;
 867         struct netpoll *netpoll;
 868         int err = 0;
 869
 870         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 871         if (!netpoll)
 872                 return -ENOMEM;
 873
 874         err = __netpoll_setup(netpoll, master);
 875         if (err) {
 876                 kfree(netpoll);
 877                 goto out;
 878         }
 879
 880         p->netpoll = netpoll;
 881 out:
 882         return err;
 883 }
 884
 885 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 886 {
 887         struct dsa_slave_priv *p = netdev_priv(dev);
 888         struct netpoll *netpoll = p->netpoll;
 889
 890         if (!netpoll)
 891                 return;
 892
 893         p->netpoll = NULL;
 894
 895         __netpoll_free_async(netpoll);
 896 }
 897
 898 static void dsa_slave_poll_controller(struct net_device *dev)
 899 {
 900 }
 901 #endif
 902
 903 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 904         .get_settings           = dsa_slave_get_settings,
 905         .set_settings           = dsa_slave_set_settings,
 906         .get_drvinfo            = dsa_slave_get_drvinfo,
 907         .get_regs_len           = dsa_slave_get_regs_len,
 908         .get_regs               = dsa_slave_get_regs,
 909         .nway_reset             = dsa_slave_nway_reset,
 910         .get_link               = dsa_slave_get_link,
 911         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 912         .get_eeprom             = dsa_slave_get_eeprom,
 913         .set_eeprom             = dsa_slave_set_eeprom,
 914         .get_strings            = dsa_slave_get_strings,
 915         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 916         .get_sset_count         = dsa_slave_get_sset_count,
 917         .set_wol                = dsa_slave_set_wol,
 918         .get_wol                = dsa_slave_get_wol,
 919         .set_eee                = dsa_slave_set_eee,
 920         .get_eee                = dsa_slave_get_eee,
 921 };
 922
 923 static const struct net_device_ops dsa_slave_netdev_ops = {
 924         .ndo_open               = dsa_slave_open,
 925         .ndo_stop               = dsa_slave_close,
 926         .ndo_start_xmit         = dsa_slave_xmit,
 927         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 928         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 929         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 930         .ndo_fdb_add            = switchdev_port_fdb_add,
 931         .ndo_fdb_del            = switchdev_port_fdb_del,
 932         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 933         .ndo_do_ioctl           = dsa_slave_ioctl,
 934         .ndo_get_iflink         = dsa_slave_get_iflink,
 935 #ifdef CONFIG_NET_POLL_CONTROLLER
 936         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 937         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 938         .ndo_poll_controller    = dsa_slave_poll_controller,
 939 #endif
 940         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 941         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 942         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 943 };
 944
 945 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 946         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 947         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 948         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 949         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 950         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 951 };
 952
 953 static struct device_type dsa_type = {
 954         .name   = "dsa",
 955 };
 956
 957 static void dsa_slave_adjust_link(struct net_device *dev)
 958 {
 959         struct dsa_slave_priv *p = netdev_priv(dev);
 960         struct dsa_switch *ds = p->parent;
 961         unsigned int status_changed = 0;
 962
 963         if (p->old_link != p->phy->link) {
 964                 status_changed = 1;
 965                 p->old_link = p->phy->link;
 966         }
 967
 968         if (p->old_duplex != p->phy->duplex) {
 969                 status_changed = 1;
 970                 p->old_duplex = p->phy->duplex;
 971         }
 972
 973         if (p->old_pause != p->phy->pause) {
 974                 status_changed = 1;
 975                 p->old_pause = p->phy->pause;
 976         }
 977
 978         if (ds->drv->adjust_link && status_changed)
 979                 ds->drv->adjust_link(ds, p->port, p->phy);
 980
 981         if (status_changed)
 982                 phy_print_status(p->phy);
 983 }
 984
 985 static int dsa_slave_fixed_link_update(struct net_device *dev,
 986                                        struct fixed_phy_status *status)
 987 {
 988         struct dsa_slave_priv *p = netdev_priv(dev);
 989         struct dsa_switch *ds = p->parent;
 990
 991         if (ds->drv->fixed_link_update)
 992                 ds->drv->fixed_link_update(ds, p->port, status);
 993
 994         return 0;
 995 }
 996
 997 /* slave device setup *******************************************************/
 998 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 999                                  struct net_device *slave_dev,
1000                                  int addr)
1001 {
1002         struct dsa_switch *ds = p->parent;
1003
1004         p->phy = ds->slave_mii_bus->phy_map[addr];
1005         if (!p->phy) {
1006                 netdev_err(slave_dev, "no phy at %d\n", addr);
1007                 return -ENODEV;
1008         }
1009
1010         /* Use already configured phy mode */
1011         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1012                 p->phy_interface = p->phy->interface;
1013         return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1014                                   p->phy_interface);
1015 }
1016
1017 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1018                                 struct net_device *slave_dev)
1019 {
1020         struct dsa_switch *ds = p->parent;
1021         struct dsa_chip_data *cd = ds->pd;
1022         struct device_node *phy_dn, *port_dn;
1023         bool phy_is_fixed = false;
1024         u32 phy_flags = 0;
1025         int mode, ret;
1026
1027         port_dn = cd->port_dn[p->port];
1028         mode = of_get_phy_mode(port_dn);
1029         if (mode < 0)
1030                 mode = PHY_INTERFACE_MODE_NA;
1031         p->phy_interface = mode;
1032
1033         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1034         if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1035                 /* In the case of a fixed PHY, the DT node associated
1036                  * to the fixed PHY is the Port DT node
1037                  */
1038                 ret = of_phy_register_fixed_link(port_dn);
1039                 if (ret) {
1040                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1041                         return ret;
1042                 }
1043                 phy_is_fixed = true;
1044                 phy_dn = of_node_get(port_dn);
1045         }
1046
1047         if (ds->drv->get_phy_flags)
1048                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1049
1050         if (phy_dn) {
1051                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1052
1053                 /* If this PHY address is part of phys_mii_mask, which means
1054                  * that we need to divert reads and writes to/from it, then we
1055                  * want to bind this device using the slave MII bus created by
1056                  * DSA to make that happen.
1057                  */
1058                 if (!phy_is_fixed && phy_id >= 0 &&
1059                     (ds->phys_mii_mask & (1 << phy_id))) {
1060                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1061                         if (ret) {
1062                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1063                                 of_node_put(phy_dn);
1064                                 return ret;
1065                         }
1066                 } else {
1067                         p->phy = of_phy_connect(slave_dev, phy_dn,
1068                                                 dsa_slave_adjust_link,
1069                                                 phy_flags,
1070                                                 p->phy_interface);
1071                 }
1072
1073                 of_node_put(phy_dn);
1074         }
1075
1076         if (p->phy && phy_is_fixed)
1077                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1078
1079         /* We could not connect to a designated PHY, so use the switch internal
1080          * MDIO bus instead
1081          */
1082         if (!p->phy) {
1083                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1084                 if (ret) {
1085                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1086                         return ret;
1087                 }
1088         } else {
1089                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
1090                             p->phy->addr, p->phy->drv->name);
1091         }
1092
1093         return 0;
1094 }
1095
1096 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1097 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1098                                             struct netdev_queue *txq,
1099                                             void *_unused)
1100 {
1101         lockdep_set_class(&txq->_xmit_lock,
1102                           &dsa_slave_netdev_xmit_lock_key);
1103 }
1104
1105 int dsa_slave_suspend(struct net_device *slave_dev)
1106 {
1107         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1108
1109         if (!netif_running(slave_dev))
1110                 return 0;
1111
1112         netif_device_detach(slave_dev);
1113
1114         if (p->phy) {
1115                 phy_stop(p->phy);
1116                 p->old_pause = -1;
1117                 p->old_link = -1;
1118                 p->old_duplex = -1;
1119                 phy_suspend(p->phy);
1120         }
1121
1122         return 0;
1123 }
1124
1125 int dsa_slave_resume(struct net_device *slave_dev)
1126 {
1127         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1128
1129         if (!netif_running(slave_dev))
1130                 return 0;
1131
1132         netif_device_attach(slave_dev);
1133
1134         if (p->phy) {
1135                 phy_resume(p->phy);
1136                 phy_start(p->phy);
1137         }
1138
1139         return 0;
1140 }
1141
1142 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1143                      int port, char *name)
1144 {
1145         struct net_device *master = ds->dst->master_netdev;
1146         struct net_device *slave_dev;
1147         struct dsa_slave_priv *p;
1148         int ret;
1149
1150         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1151                                  NET_NAME_UNKNOWN, ether_setup);
1152         if (slave_dev == NULL)
1153                 return -ENOMEM;
1154
1155         slave_dev->features = master->vlan_features;
1156         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1157         eth_hw_addr_inherit(slave_dev, master);
1158         slave_dev->priv_flags |= IFF_NO_QUEUE;
1159         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1160         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1161         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1162
1163         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1164                                  NULL);
1165
1166         SET_NETDEV_DEV(slave_dev, parent);
1167         slave_dev->dev.of_node = ds->pd->port_dn[port];
1168         slave_dev->vlan_features = master->vlan_features;
1169
1170         p = netdev_priv(slave_dev);
1171         p->dev = slave_dev;
1172         p->parent = ds;
1173         p->port = port;
1174
1175         switch (ds->dst->tag_protocol) {
1176 #ifdef CONFIG_NET_DSA_TAG_DSA
1177         case DSA_TAG_PROTO_DSA:
1178                 p->xmit = dsa_netdev_ops.xmit;
1179                 break;
1180 #endif
1181 #ifdef CONFIG_NET_DSA_TAG_EDSA
1182         case DSA_TAG_PROTO_EDSA:
1183                 p->xmit = edsa_netdev_ops.xmit;
1184                 break;
1185 #endif
1186 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1187         case DSA_TAG_PROTO_TRAILER:
1188                 p->xmit = trailer_netdev_ops.xmit;
1189                 break;
1190 #endif
1191 #ifdef CONFIG_NET_DSA_TAG_BRCM
1192         case DSA_TAG_PROTO_BRCM:
1193                 p->xmit = brcm_netdev_ops.xmit;
1194                 break;
1195 #endif
1196         default:
1197                 p->xmit = dsa_slave_notag_xmit;
1198                 break;
1199         }
1200
1201         p->old_pause = -1;
1202         p->old_link = -1;
1203         p->old_duplex = -1;
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         ds->ports[port] = slave_dev;
1213         ret = register_netdev(slave_dev);
1214         if (ret) {
1215                 netdev_err(master, "error %d registering interface %s\n",
1216                            ret, slave_dev->name);
1217                 phy_disconnect(p->phy);
1218                 ds->ports[port] = NULL;
1219                 free_netdev(slave_dev);
1220                 return ret;
1221         }
1222
1223         netif_carrier_off(slave_dev);
1224
1225         return 0;
1226 }
1227
1228 static bool dsa_slave_dev_check(struct net_device *dev)
1229 {
1230         return dev->netdev_ops == &dsa_slave_netdev_ops;
1231 }
1232
1233 static int dsa_slave_master_changed(struct net_device *dev)
1234 {
1235         struct net_device *master = netdev_master_upper_dev_get(dev);
1236         struct dsa_slave_priv *p = netdev_priv(dev);
1237         int err = 0;
1238
1239         if (master && master->rtnl_link_ops &&
1240             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1241                 err = dsa_slave_bridge_port_join(dev, master);
1242         else if (dsa_port_is_bridged(p))
1243                 err = dsa_slave_bridge_port_leave(dev);
1244
1245         return err;
1246 }
1247
1248 int dsa_slave_netdevice_event(struct notifier_block *unused,
1249                               unsigned long event, void *ptr)
1250 {
1251         struct net_device *dev;
1252         int err = 0;
1253
1254         switch (event) {
1255         case NETDEV_CHANGEUPPER:
1256                 dev = netdev_notifier_info_to_dev(ptr);
1257                 if (!dsa_slave_dev_check(dev))
1258                         goto out;
1259
1260                 err = dsa_slave_master_changed(dev);
1261                 if (err && err != -EOPNOTSUPP)
1262                         netdev_warn(dev, "failed to reflect master change\n");
1263
1264                 break;
1265         }
1266
1267 out:
1268         return NOTIFY_DONE;
1269 }