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