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