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