net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <linux/mdio.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/switchdev.h>
  21 #include <linux/if_bridge.h>
  22 #include <linux/netpoll.h>
  23 #include "dsa_priv.h"
  24
  25 /* slave mii_bus handling ***************************************************/
  26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  27 {
  28         struct dsa_switch *ds = bus->priv;
  29
  30         if (ds->phys_mii_mask & (1 << addr))
  31                 return ds->drv->phy_read(ds, addr, reg);
  32
  33         return 0xffff;
  34 }
  35
  36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  37 {
  38         struct dsa_switch *ds = bus->priv;
  39
  40         if (ds->phys_mii_mask & (1 << addr))
  41                 return ds->drv->phy_write(ds, addr, reg, val);
  42
  43         return 0;
  44 }
  45
  46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  47 {
  48         ds->slave_mii_bus->priv = (void *)ds;
  49         ds->slave_mii_bus->name = "dsa slave smi";
  50         ds->slave_mii_bus->read = dsa_slave_phy_read;
  51         ds->slave_mii_bus->write = dsa_slave_phy_write;
  52         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  53                         ds->index, ds->pd->sw_addr);
  54         ds->slave_mii_bus->parent = ds->master_dev;
  55         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  56 }
  57
  58
  59 /* slave device handling ****************************************************/
  60 static int dsa_slave_get_iflink(const struct net_device *dev)
  61 {
  62         struct dsa_slave_priv *p = netdev_priv(dev);
  63
  64         return p->parent->dst->master_netdev->ifindex;
  65 }
  66
  67 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  68 {
  69         return !!p->bridge_dev;
  70 }
  71
  72 static int dsa_slave_open(struct net_device *dev)
  73 {
  74         struct dsa_slave_priv *p = netdev_priv(dev);
  75         struct net_device *master = p->parent->dst->master_netdev;
  76         struct dsa_switch *ds = p->parent;
  77         u8 stp_state = dsa_port_is_bridged(p) ?
  78                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  79         int err;
  80
  81         if (!(master->flags & IFF_UP))
  82                 return -ENETDOWN;
  83
  84         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  85                 err = dev_uc_add(master, dev->dev_addr);
  86                 if (err < 0)
  87                         goto out;
  88         }
  89
  90         if (dev->flags & IFF_ALLMULTI) {
  91                 err = dev_set_allmulti(master, 1);
  92                 if (err < 0)
  93                         goto del_unicast;
  94         }
  95         if (dev->flags & IFF_PROMISC) {
  96                 err = dev_set_promiscuity(master, 1);
  97                 if (err < 0)
  98                         goto clear_allmulti;
  99         }
 100
 101         if (ds->drv->port_enable) {
 102                 err = ds->drv->port_enable(ds, p->port, p->phy);
 103                 if (err)
 104                         goto clear_promisc;
 105         }
 106
 107         if (ds->drv->port_stp_state_set)
 108                 ds->drv->port_stp_state_set(ds, p->port, stp_state);
 109
 110         if (p->phy)
 111                 phy_start(p->phy);
 112
 113         return 0;
 114
 115 clear_promisc:
 116         if (dev->flags & IFF_PROMISC)
 117                 dev_set_promiscuity(master, -1);
 118 clear_allmulti:
 119         if (dev->flags & IFF_ALLMULTI)
 120                 dev_set_allmulti(master, -1);
 121 del_unicast:
 122         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 123                 dev_uc_del(master, dev->dev_addr);
 124 out:
 125         return err;
 126 }
 127
 128 static int dsa_slave_close(struct net_device *dev)
 129 {
 130         struct dsa_slave_priv *p = netdev_priv(dev);
 131         struct net_device *master = p->parent->dst->master_netdev;
 132         struct dsa_switch *ds = p->parent;
 133
 134         if (p->phy)
 135                 phy_stop(p->phy);
 136
 137         dev_mc_unsync(master, dev);
 138         dev_uc_unsync(master, dev);
 139         if (dev->flags & IFF_ALLMULTI)
 140                 dev_set_allmulti(master, -1);
 141         if (dev->flags & IFF_PROMISC)
 142                 dev_set_promiscuity(master, -1);
 143
 144         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 145                 dev_uc_del(master, dev->dev_addr);
 146
 147         if (ds->drv->port_disable)
 148                 ds->drv->port_disable(ds, p->port, p->phy);
 149
 150         if (ds->drv->port_stp_state_set)
 151                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_DISABLED);
 152
 153         return 0;
 154 }
 155
 156 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 157 {
 158         struct dsa_slave_priv *p = netdev_priv(dev);
 159         struct net_device *master = p->parent->dst->master_netdev;
 160
 161         if (change & IFF_ALLMULTI)
 162                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 163         if (change & IFF_PROMISC)
 164                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 165 }
 166
 167 static void dsa_slave_set_rx_mode(struct net_device *dev)
 168 {
 169         struct dsa_slave_priv *p = netdev_priv(dev);
 170         struct net_device *master = p->parent->dst->master_netdev;
 171
 172         dev_mc_sync(master, dev);
 173         dev_uc_sync(master, dev);
 174 }
 175
 176 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 177 {
 178         struct dsa_slave_priv *p = netdev_priv(dev);
 179         struct net_device *master = p->parent->dst->master_netdev;
 180         struct sockaddr *addr = a;
 181         int err;
 182
 183         if (!is_valid_ether_addr(addr->sa_data))
 184                 return -EADDRNOTAVAIL;
 185
 186         if (!(dev->flags & IFF_UP))
 187                 goto out;
 188
 189         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 190                 err = dev_uc_add(master, addr->sa_data);
 191                 if (err < 0)
 192                         return err;
 193         }
 194
 195         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 196                 dev_uc_del(master, dev->dev_addr);
 197
 198 out:
 199         ether_addr_copy(dev->dev_addr, addr->sa_data);
 200
 201         return 0;
 202 }
 203
 204 static int dsa_slave_port_vlan_add(struct net_device *dev,
 205                                    const struct switchdev_obj_port_vlan *vlan,
 206                                    struct switchdev_trans *trans)
 207 {
 208         struct dsa_slave_priv *p = netdev_priv(dev);
 209         struct dsa_switch *ds = p->parent;
 210         int err;
 211
 212         if (switchdev_trans_ph_prepare(trans)) {
 213                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 214                         return -EOPNOTSUPP;
 215
 216                 err = ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 217                 if (err)
 218                         return err;
 219         } else {
 220                 err = ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 221                 if (err)
 222                         return err;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static int dsa_slave_port_vlan_del(struct net_device *dev,
 229                                    const struct switchdev_obj_port_vlan *vlan)
 230 {
 231         struct dsa_slave_priv *p = netdev_priv(dev);
 232         struct dsa_switch *ds = p->parent;
 233
 234         if (!ds->drv->port_vlan_del)
 235                 return -EOPNOTSUPP;
 236
 237         return ds->drv->port_vlan_del(ds, p->port, vlan);
 238 }
 239
 240 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 241                                     struct switchdev_obj_port_vlan *vlan,
 242                                     switchdev_obj_dump_cb_t *cb)
 243 {
 244         struct dsa_slave_priv *p = netdev_priv(dev);
 245         struct dsa_switch *ds = p->parent;
 246
 247         if (ds->drv->port_vlan_dump)
 248                 return ds->drv->port_vlan_dump(ds, p->port, vlan, cb);
 249
 250         return -EOPNOTSUPP;
 251 }
 252
 253 static int dsa_slave_port_fdb_add(struct net_device *dev,
 254                                   const struct switchdev_obj_port_fdb *fdb,
 255                                   struct switchdev_trans *trans)
 256 {
 257         struct dsa_slave_priv *p = netdev_priv(dev);
 258         struct dsa_switch *ds = p->parent;
 259         int ret;
 260
 261         if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 262                 return -EOPNOTSUPP;
 263
 264         if (switchdev_trans_ph_prepare(trans))
 265                 ret = ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 266         else
 267                 ret = ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 268
 269         return ret;
 270 }
 271
 272 static int dsa_slave_port_fdb_del(struct net_device *dev,
 273                                   const struct switchdev_obj_port_fdb *fdb)
 274 {
 275         struct dsa_slave_priv *p = netdev_priv(dev);
 276         struct dsa_switch *ds = p->parent;
 277         int ret = -EOPNOTSUPP;
 278
 279         if (ds->drv->port_fdb_del)
 280                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 281
 282         return ret;
 283 }
 284
 285 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 286                                    struct switchdev_obj_port_fdb *fdb,
 287                                    switchdev_obj_dump_cb_t *cb)
 288 {
 289         struct dsa_slave_priv *p = netdev_priv(dev);
 290         struct dsa_switch *ds = p->parent;
 291
 292         if (ds->drv->port_fdb_dump)
 293                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 294
 295         return -EOPNOTSUPP;
 296 }
 297
 298 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 299 {
 300         struct dsa_slave_priv *p = netdev_priv(dev);
 301
 302         if (p->phy != NULL)
 303                 return phy_mii_ioctl(p->phy, ifr, cmd);
 304
 305         return -EOPNOTSUPP;
 306 }
 307
 308 static int dsa_slave_stp_state_set(struct net_device *dev,
 309                                    const struct switchdev_attr *attr,
 310                                    struct switchdev_trans *trans)
 311 {
 312         struct dsa_slave_priv *p = netdev_priv(dev);
 313         struct dsa_switch *ds = p->parent;
 314
 315         if (switchdev_trans_ph_prepare(trans))
 316                 return ds->drv->port_stp_state_set ? 0 : -EOPNOTSUPP;
 317
 318         ds->drv->port_stp_state_set(ds, p->port, attr->u.stp_state);
 319
 320         return 0;
 321 }
 322
 323 static int dsa_slave_vlan_filtering(struct net_device *dev,
 324                                     const struct switchdev_attr *attr,
 325                                     struct switchdev_trans *trans)
 326 {
 327         struct dsa_slave_priv *p = netdev_priv(dev);
 328         struct dsa_switch *ds = p->parent;
 329
 330         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 331         if (switchdev_trans_ph_prepare(trans))
 332                 return 0;
 333
 334         if (ds->drv->port_vlan_filtering)
 335                 return ds->drv->port_vlan_filtering(ds, p->port,
 336                                                     attr->u.vlan_filtering);
 337
 338         return 0;
 339 }
 340
 341 static int dsa_slave_port_attr_set(struct net_device *dev,
 342                                    const struct switchdev_attr *attr,
 343                                    struct switchdev_trans *trans)
 344 {
 345         int ret;
 346
 347         switch (attr->id) {
 348         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 349                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 350                 break;
 351         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 352                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 353                 break;
 354         default:
 355                 ret = -EOPNOTSUPP;
 356                 break;
 357         }
 358
 359         return ret;
 360 }
 361
 362 static int dsa_slave_port_obj_add(struct net_device *dev,
 363                                   const struct switchdev_obj *obj,
 364                                   struct switchdev_trans *trans)
 365 {
 366         int err;
 367
 368         /* For the prepare phase, ensure the full set of changes is feasable in
 369          * one go in order to signal a failure properly. If an operation is not
 370          * supported, return -EOPNOTSUPP.
 371          */
 372
 373         switch (obj->id) {
 374         case SWITCHDEV_OBJ_ID_PORT_FDB:
 375                 err = dsa_slave_port_fdb_add(dev,
 376                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 377                                              trans);
 378                 break;
 379         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 380                 err = dsa_slave_port_vlan_add(dev,
 381                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 382                                               trans);
 383                 break;
 384         default:
 385                 err = -EOPNOTSUPP;
 386                 break;
 387         }
 388
 389         return err;
 390 }
 391
 392 static int dsa_slave_port_obj_del(struct net_device *dev,
 393                                   const struct switchdev_obj *obj)
 394 {
 395         int err;
 396
 397         switch (obj->id) {
 398         case SWITCHDEV_OBJ_ID_PORT_FDB:
 399                 err = dsa_slave_port_fdb_del(dev,
 400                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 401                 break;
 402         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 403                 err = dsa_slave_port_vlan_del(dev,
 404                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 405                 break;
 406         default:
 407                 err = -EOPNOTSUPP;
 408                 break;
 409         }
 410
 411         return err;
 412 }
 413
 414 static int dsa_slave_port_obj_dump(struct net_device *dev,
 415                                    struct switchdev_obj *obj,
 416                                    switchdev_obj_dump_cb_t *cb)
 417 {
 418         int err;
 419
 420         switch (obj->id) {
 421         case SWITCHDEV_OBJ_ID_PORT_FDB:
 422                 err = dsa_slave_port_fdb_dump(dev,
 423                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 424                                               cb);
 425                 break;
 426         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 427                 err = dsa_slave_port_vlan_dump(dev,
 428                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 429                                                cb);
 430                 break;
 431         default:
 432                 err = -EOPNOTSUPP;
 433                 break;
 434         }
 435
 436         return err;
 437 }
 438
 439 static int dsa_slave_bridge_port_join(struct net_device *dev,
 440                                       struct net_device *br)
 441 {
 442         struct dsa_slave_priv *p = netdev_priv(dev);
 443         struct dsa_switch *ds = p->parent;
 444         int ret = -EOPNOTSUPP;
 445
 446         p->bridge_dev = br;
 447
 448         if (ds->drv->port_bridge_join)
 449                 ret = ds->drv->port_bridge_join(ds, p->port, br);
 450
 451         return ret == -EOPNOTSUPP ? 0 : ret;
 452 }
 453
 454 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 455 {
 456         struct dsa_slave_priv *p = netdev_priv(dev);
 457         struct dsa_switch *ds = p->parent;
 458
 459
 460         if (ds->drv->port_bridge_leave)
 461                 ds->drv->port_bridge_leave(ds, p->port);
 462
 463         p->bridge_dev = NULL;
 464
 465         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 466          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 467          */
 468         if (ds->drv->port_stp_state_set)
 469                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
 470 }
 471
 472 static int dsa_slave_port_attr_get(struct net_device *dev,
 473                                    struct switchdev_attr *attr)
 474 {
 475         struct dsa_slave_priv *p = netdev_priv(dev);
 476         struct dsa_switch *ds = p->parent;
 477
 478         switch (attr->id) {
 479         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 480                 attr->u.ppid.id_len = sizeof(ds->index);
 481                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 482                 break;
 483         default:
 484                 return -EOPNOTSUPP;
 485         }
 486
 487         return 0;
 488 }
 489
 490 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 491                                                struct sk_buff *skb)
 492 {
 493 #ifdef CONFIG_NET_POLL_CONTROLLER
 494         if (p->netpoll)
 495                 netpoll_send_skb(p->netpoll, skb);
 496 #else
 497         BUG();
 498 #endif
 499         return NETDEV_TX_OK;
 500 }
 501
 502 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 503 {
 504         struct dsa_slave_priv *p = netdev_priv(dev);
 505         struct sk_buff *nskb;
 506
 507         dev->stats.tx_packets++;
 508         dev->stats.tx_bytes += skb->len;
 509
 510         /* Transmit function may have to reallocate the original SKB */
 511         nskb = p->xmit(skb, dev);
 512         if (!nskb)
 513                 return NETDEV_TX_OK;
 514
 515         /* SKB for netpoll still need to be mangled with the protocol-specific
 516          * tag to be successfully transmitted
 517          */
 518         if (unlikely(netpoll_tx_running(dev)))
 519                 return dsa_netpoll_send_skb(p, nskb);
 520
 521         /* Queue the SKB for transmission on the parent interface, but
 522          * do not modify its EtherType
 523          */
 524         nskb->dev = p->parent->dst->master_netdev;
 525         dev_queue_xmit(nskb);
 526
 527         return NETDEV_TX_OK;
 528 }
 529
 530 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 531                                             struct net_device *dev)
 532 {
 533         /* Just return the original SKB */
 534         return skb;
 535 }
 536
 537
 538 /* ethtool operations *******************************************************/
 539 static int
 540 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 541 {
 542         struct dsa_slave_priv *p = netdev_priv(dev);
 543         int err;
 544
 545         err = -EOPNOTSUPP;
 546         if (p->phy != NULL) {
 547                 err = phy_read_status(p->phy);
 548                 if (err == 0)
 549                         err = phy_ethtool_gset(p->phy, cmd);
 550         }
 551
 552         return err;
 553 }
 554
 555 static int
 556 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 557 {
 558         struct dsa_slave_priv *p = netdev_priv(dev);
 559
 560         if (p->phy != NULL)
 561                 return phy_ethtool_sset(p->phy, cmd);
 562
 563         return -EOPNOTSUPP;
 564 }
 565
 566 static void dsa_slave_get_drvinfo(struct net_device *dev,
 567                                   struct ethtool_drvinfo *drvinfo)
 568 {
 569         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 570         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 571         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 572         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 573 }
 574
 575 static int dsa_slave_get_regs_len(struct net_device *dev)
 576 {
 577         struct dsa_slave_priv *p = netdev_priv(dev);
 578         struct dsa_switch *ds = p->parent;
 579
 580         if (ds->drv->get_regs_len)
 581                 return ds->drv->get_regs_len(ds, p->port);
 582
 583         return -EOPNOTSUPP;
 584 }
 585
 586 static void
 587 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 588 {
 589         struct dsa_slave_priv *p = netdev_priv(dev);
 590         struct dsa_switch *ds = p->parent;
 591
 592         if (ds->drv->get_regs)
 593                 ds->drv->get_regs(ds, p->port, regs, _p);
 594 }
 595
 596 static int dsa_slave_nway_reset(struct net_device *dev)
 597 {
 598         struct dsa_slave_priv *p = netdev_priv(dev);
 599
 600         if (p->phy != NULL)
 601                 return genphy_restart_aneg(p->phy);
 602
 603         return -EOPNOTSUPP;
 604 }
 605
 606 static u32 dsa_slave_get_link(struct net_device *dev)
 607 {
 608         struct dsa_slave_priv *p = netdev_priv(dev);
 609
 610         if (p->phy != NULL) {
 611                 genphy_update_link(p->phy);
 612                 return p->phy->link;
 613         }
 614
 615         return -EOPNOTSUPP;
 616 }
 617
 618 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 619 {
 620         struct dsa_slave_priv *p = netdev_priv(dev);
 621         struct dsa_switch *ds = p->parent;
 622
 623         if (ds->pd->eeprom_len)
 624                 return ds->pd->eeprom_len;
 625
 626         if (ds->drv->get_eeprom_len)
 627                 return ds->drv->get_eeprom_len(ds);
 628
 629         return 0;
 630 }
 631
 632 static int dsa_slave_get_eeprom(struct net_device *dev,
 633                                 struct ethtool_eeprom *eeprom, u8 *data)
 634 {
 635         struct dsa_slave_priv *p = netdev_priv(dev);
 636         struct dsa_switch *ds = p->parent;
 637
 638         if (ds->drv->get_eeprom)
 639                 return ds->drv->get_eeprom(ds, eeprom, data);
 640
 641         return -EOPNOTSUPP;
 642 }
 643
 644 static int dsa_slave_set_eeprom(struct net_device *dev,
 645                                 struct ethtool_eeprom *eeprom, u8 *data)
 646 {
 647         struct dsa_slave_priv *p = netdev_priv(dev);
 648         struct dsa_switch *ds = p->parent;
 649
 650         if (ds->drv->set_eeprom)
 651                 return ds->drv->set_eeprom(ds, eeprom, data);
 652
 653         return -EOPNOTSUPP;
 654 }
 655
 656 static void dsa_slave_get_strings(struct net_device *dev,
 657                                   uint32_t stringset, uint8_t *data)
 658 {
 659         struct dsa_slave_priv *p = netdev_priv(dev);
 660         struct dsa_switch *ds = p->parent;
 661
 662         if (stringset == ETH_SS_STATS) {
 663                 int len = ETH_GSTRING_LEN;
 664
 665                 strncpy(data, "tx_packets", len);
 666                 strncpy(data + len, "tx_bytes", len);
 667                 strncpy(data + 2 * len, "rx_packets", len);
 668                 strncpy(data + 3 * len, "rx_bytes", len);
 669                 if (ds->drv->get_strings != NULL)
 670                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 671         }
 672 }
 673
 674 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 675                                         struct ethtool_stats *stats,
 676                                         uint64_t *data)
 677 {
 678         struct dsa_slave_priv *p = netdev_priv(dev);
 679         struct dsa_switch *ds = p->parent;
 680
 681         data[0] = p->dev->stats.tx_packets;
 682         data[1] = p->dev->stats.tx_bytes;
 683         data[2] = p->dev->stats.rx_packets;
 684         data[3] = p->dev->stats.rx_bytes;
 685         if (ds->drv->get_ethtool_stats != NULL)
 686                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 687 }
 688
 689 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 690 {
 691         struct dsa_slave_priv *p = netdev_priv(dev);
 692         struct dsa_switch *ds = p->parent;
 693
 694         if (sset == ETH_SS_STATS) {
 695                 int count;
 696
 697                 count = 4;
 698                 if (ds->drv->get_sset_count != NULL)
 699                         count += ds->drv->get_sset_count(ds);
 700
 701                 return count;
 702         }
 703
 704         return -EOPNOTSUPP;
 705 }
 706
 707 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 708 {
 709         struct dsa_slave_priv *p = netdev_priv(dev);
 710         struct dsa_switch *ds = p->parent;
 711
 712         if (ds->drv->get_wol)
 713                 ds->drv->get_wol(ds, p->port, w);
 714 }
 715
 716 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 717 {
 718         struct dsa_slave_priv *p = netdev_priv(dev);
 719         struct dsa_switch *ds = p->parent;
 720         int ret = -EOPNOTSUPP;
 721
 722         if (ds->drv->set_wol)
 723                 ret = ds->drv->set_wol(ds, p->port, w);
 724
 725         return ret;
 726 }
 727
 728 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 729 {
 730         struct dsa_slave_priv *p = netdev_priv(dev);
 731         struct dsa_switch *ds = p->parent;
 732         int ret;
 733
 734         if (!ds->drv->set_eee)
 735                 return -EOPNOTSUPP;
 736
 737         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 738         if (ret)
 739                 return ret;
 740
 741         if (p->phy)
 742                 ret = phy_ethtool_set_eee(p->phy, e);
 743
 744         return ret;
 745 }
 746
 747 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 748 {
 749         struct dsa_slave_priv *p = netdev_priv(dev);
 750         struct dsa_switch *ds = p->parent;
 751         int ret;
 752
 753         if (!ds->drv->get_eee)
 754                 return -EOPNOTSUPP;
 755
 756         ret = ds->drv->get_eee(ds, p->port, e);
 757         if (ret)
 758                 return ret;
 759
 760         if (p->phy)
 761                 ret = phy_ethtool_get_eee(p->phy, e);
 762
 763         return ret;
 764 }
 765
 766 #ifdef CONFIG_NET_POLL_CONTROLLER
 767 static int dsa_slave_netpoll_setup(struct net_device *dev,
 768                                    struct netpoll_info *ni)
 769 {
 770         struct dsa_slave_priv *p = netdev_priv(dev);
 771         struct dsa_switch *ds = p->parent;
 772         struct net_device *master = ds->dst->master_netdev;
 773         struct netpoll *netpoll;
 774         int err = 0;
 775
 776         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 777         if (!netpoll)
 778                 return -ENOMEM;
 779
 780         err = __netpoll_setup(netpoll, master);
 781         if (err) {
 782                 kfree(netpoll);
 783                 goto out;
 784         }
 785
 786         p->netpoll = netpoll;
 787 out:
 788         return err;
 789 }
 790
 791 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 792 {
 793         struct dsa_slave_priv *p = netdev_priv(dev);
 794         struct netpoll *netpoll = p->netpoll;
 795
 796         if (!netpoll)
 797                 return;
 798
 799         p->netpoll = NULL;
 800
 801         __netpoll_free_async(netpoll);
 802 }
 803
 804 static void dsa_slave_poll_controller(struct net_device *dev)
 805 {
 806 }
 807 #endif
 808
 809 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 810         .get_settings           = dsa_slave_get_settings,
 811         .set_settings           = dsa_slave_set_settings,
 812         .get_drvinfo            = dsa_slave_get_drvinfo,
 813         .get_regs_len           = dsa_slave_get_regs_len,
 814         .get_regs               = dsa_slave_get_regs,
 815         .nway_reset             = dsa_slave_nway_reset,
 816         .get_link               = dsa_slave_get_link,
 817         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 818         .get_eeprom             = dsa_slave_get_eeprom,
 819         .set_eeprom             = dsa_slave_set_eeprom,
 820         .get_strings            = dsa_slave_get_strings,
 821         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 822         .get_sset_count         = dsa_slave_get_sset_count,
 823         .set_wol                = dsa_slave_set_wol,
 824         .get_wol                = dsa_slave_get_wol,
 825         .set_eee                = dsa_slave_set_eee,
 826         .get_eee                = dsa_slave_get_eee,
 827 };
 828
 829 static const struct net_device_ops dsa_slave_netdev_ops = {
 830         .ndo_open               = dsa_slave_open,
 831         .ndo_stop               = dsa_slave_close,
 832         .ndo_start_xmit         = dsa_slave_xmit,
 833         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 834         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 835         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 836         .ndo_fdb_add            = switchdev_port_fdb_add,
 837         .ndo_fdb_del            = switchdev_port_fdb_del,
 838         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 839         .ndo_do_ioctl           = dsa_slave_ioctl,
 840         .ndo_get_iflink         = dsa_slave_get_iflink,
 841 #ifdef CONFIG_NET_POLL_CONTROLLER
 842         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 843         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 844         .ndo_poll_controller    = dsa_slave_poll_controller,
 845 #endif
 846         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 847         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 848         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 849 };
 850
 851 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 852         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 853         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 854         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 855         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 856         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 857 };
 858
 859 static struct device_type dsa_type = {
 860         .name   = "dsa",
 861 };
 862
 863 static void dsa_slave_adjust_link(struct net_device *dev)
 864 {
 865         struct dsa_slave_priv *p = netdev_priv(dev);
 866         struct dsa_switch *ds = p->parent;
 867         unsigned int status_changed = 0;
 868
 869         if (p->old_link != p->phy->link) {
 870                 status_changed = 1;
 871                 p->old_link = p->phy->link;
 872         }
 873
 874         if (p->old_duplex != p->phy->duplex) {
 875                 status_changed = 1;
 876                 p->old_duplex = p->phy->duplex;
 877         }
 878
 879         if (p->old_pause != p->phy->pause) {
 880                 status_changed = 1;
 881                 p->old_pause = p->phy->pause;
 882         }
 883
 884         if (ds->drv->adjust_link && status_changed)
 885                 ds->drv->adjust_link(ds, p->port, p->phy);
 886
 887         if (status_changed)
 888                 phy_print_status(p->phy);
 889 }
 890
 891 static int dsa_slave_fixed_link_update(struct net_device *dev,
 892                                        struct fixed_phy_status *status)
 893 {
 894         struct dsa_slave_priv *p;
 895         struct dsa_switch *ds;
 896
 897         if (dev) {
 898                 p = netdev_priv(dev);
 899                 ds = p->parent;
 900                 if (ds->drv->fixed_link_update)
 901                         ds->drv->fixed_link_update(ds, p->port, status);
 902         }
 903
 904         return 0;
 905 }
 906
 907 /* slave device setup *******************************************************/
 908 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 909                                  struct net_device *slave_dev,
 910                                  int addr)
 911 {
 912         struct dsa_switch *ds = p->parent;
 913
 914         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
 915         if (!p->phy) {
 916                 netdev_err(slave_dev, "no phy at %d\n", addr);
 917                 return -ENODEV;
 918         }
 919
 920         /* Use already configured phy mode */
 921         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
 922                 p->phy_interface = p->phy->interface;
 923         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 924                            p->phy_interface);
 925
 926         return 0;
 927 }
 928
 929 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 930                                 struct net_device *slave_dev)
 931 {
 932         struct dsa_switch *ds = p->parent;
 933         struct dsa_chip_data *cd = ds->pd;
 934         struct device_node *phy_dn, *port_dn;
 935         bool phy_is_fixed = false;
 936         u32 phy_flags = 0;
 937         int mode, ret;
 938
 939         port_dn = cd->port_dn[p->port];
 940         mode = of_get_phy_mode(port_dn);
 941         if (mode < 0)
 942                 mode = PHY_INTERFACE_MODE_NA;
 943         p->phy_interface = mode;
 944
 945         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 946         if (of_phy_is_fixed_link(port_dn)) {
 947                 /* In the case of a fixed PHY, the DT node associated
 948                  * to the fixed PHY is the Port DT node
 949                  */
 950                 ret = of_phy_register_fixed_link(port_dn);
 951                 if (ret) {
 952                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
 953                         return ret;
 954                 }
 955                 phy_is_fixed = true;
 956                 phy_dn = port_dn;
 957         }
 958
 959         if (ds->drv->get_phy_flags)
 960                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 961
 962         if (phy_dn) {
 963                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
 964
 965                 /* If this PHY address is part of phys_mii_mask, which means
 966                  * that we need to divert reads and writes to/from it, then we
 967                  * want to bind this device using the slave MII bus created by
 968                  * DSA to make that happen.
 969                  */
 970                 if (!phy_is_fixed && phy_id >= 0 &&
 971                     (ds->phys_mii_mask & (1 << phy_id))) {
 972                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
 973                         if (ret) {
 974                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
 975                                 return ret;
 976                         }
 977                 } else {
 978                         p->phy = of_phy_connect(slave_dev, phy_dn,
 979                                                 dsa_slave_adjust_link,
 980                                                 phy_flags,
 981                                                 p->phy_interface);
 982                 }
 983         }
 984
 985         if (p->phy && phy_is_fixed)
 986                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 987
 988         /* We could not connect to a designated PHY, so use the switch internal
 989          * MDIO bus instead
 990          */
 991         if (!p->phy) {
 992                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
 993                 if (ret) {
 994                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
 995                         return ret;
 996                 }
 997         }
 998
 999         phy_attached_info(p->phy);
1000
1001         return 0;
1002 }
1003
1004 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1005 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1006                                             struct netdev_queue *txq,
1007                                             void *_unused)
1008 {
1009         lockdep_set_class(&txq->_xmit_lock,
1010                           &dsa_slave_netdev_xmit_lock_key);
1011 }
1012
1013 int dsa_slave_suspend(struct net_device *slave_dev)
1014 {
1015         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1016
1017         if (p->phy) {
1018                 phy_stop(p->phy);
1019                 p->old_pause = -1;
1020                 p->old_link = -1;
1021                 p->old_duplex = -1;
1022                 phy_suspend(p->phy);
1023         }
1024
1025         return 0;
1026 }
1027
1028 int dsa_slave_resume(struct net_device *slave_dev)
1029 {
1030         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1031
1032         netif_device_attach(slave_dev);
1033
1034         if (p->phy) {
1035                 phy_resume(p->phy);
1036                 phy_start(p->phy);
1037         }
1038
1039         return 0;
1040 }
1041
1042 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1043                      int port, char *name)
1044 {
1045         struct net_device *master = ds->dst->master_netdev;
1046         struct net_device *slave_dev;
1047         struct dsa_slave_priv *p;
1048         int ret;
1049
1050         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1051                                  NET_NAME_UNKNOWN, ether_setup);
1052         if (slave_dev == NULL)
1053                 return -ENOMEM;
1054
1055         slave_dev->features = master->vlan_features;
1056         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1057         eth_hw_addr_inherit(slave_dev, master);
1058         slave_dev->priv_flags |= IFF_NO_QUEUE;
1059         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1060         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1061         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1062
1063         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1064                                  NULL);
1065
1066         SET_NETDEV_DEV(slave_dev, parent);
1067         slave_dev->dev.of_node = ds->pd->port_dn[port];
1068         slave_dev->vlan_features = master->vlan_features;
1069
1070         p = netdev_priv(slave_dev);
1071         p->dev = slave_dev;
1072         p->parent = ds;
1073         p->port = port;
1074
1075         switch (ds->dst->tag_protocol) {
1076 #ifdef CONFIG_NET_DSA_TAG_DSA
1077         case DSA_TAG_PROTO_DSA:
1078                 p->xmit = dsa_netdev_ops.xmit;
1079                 break;
1080 #endif
1081 #ifdef CONFIG_NET_DSA_TAG_EDSA
1082         case DSA_TAG_PROTO_EDSA:
1083                 p->xmit = edsa_netdev_ops.xmit;
1084                 break;
1085 #endif
1086 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1087         case DSA_TAG_PROTO_TRAILER:
1088                 p->xmit = trailer_netdev_ops.xmit;
1089                 break;
1090 #endif
1091 #ifdef CONFIG_NET_DSA_TAG_BRCM
1092         case DSA_TAG_PROTO_BRCM:
1093                 p->xmit = brcm_netdev_ops.xmit;
1094                 break;
1095 #endif
1096         default:
1097                 p->xmit = dsa_slave_notag_xmit;
1098                 break;
1099         }
1100
1101         p->old_pause = -1;
1102         p->old_link = -1;
1103         p->old_duplex = -1;
1104
1105         ds->ports[port] = slave_dev;
1106         ret = register_netdev(slave_dev);
1107         if (ret) {
1108                 netdev_err(master, "error %d registering interface %s\n",
1109                            ret, slave_dev->name);
1110                 ds->ports[port] = NULL;
1111                 free_netdev(slave_dev);
1112                 return ret;
1113         }
1114
1115         netif_carrier_off(slave_dev);
1116
1117         ret = dsa_slave_phy_setup(p, slave_dev);
1118         if (ret) {
1119                 netdev_err(master, "error %d setting up slave phy\n", ret);
1120                 unregister_netdev(slave_dev);
1121                 free_netdev(slave_dev);
1122                 return ret;
1123         }
1124
1125         return 0;
1126 }
1127
1128 void dsa_slave_destroy(struct net_device *slave_dev)
1129 {
1130         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1131
1132         netif_carrier_off(slave_dev);
1133         if (p->phy)
1134                 phy_disconnect(p->phy);
1135         unregister_netdev(slave_dev);
1136         free_netdev(slave_dev);
1137 }
1138
1139 static bool dsa_slave_dev_check(struct net_device *dev)
1140 {
1141         return dev->netdev_ops == &dsa_slave_netdev_ops;
1142 }
1143
1144 static int dsa_slave_port_upper_event(struct net_device *dev,
1145                                       unsigned long event, void *ptr)
1146 {
1147         struct netdev_notifier_changeupper_info *info = ptr;
1148         struct net_device *upper = info->upper_dev;
1149         int err = 0;
1150
1151         switch (event) {
1152         case NETDEV_CHANGEUPPER:
1153                 if (netif_is_bridge_master(upper)) {
1154                         if (info->linking)
1155                                 err = dsa_slave_bridge_port_join(dev, upper);
1156                         else
1157                                 dsa_slave_bridge_port_leave(dev);
1158                 }
1159
1160                 break;
1161         }
1162
1163         return notifier_from_errno(err);
1164 }
1165
1166 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1167                                 void *ptr)
1168 {
1169         switch (event) {
1170         case NETDEV_CHANGEUPPER:
1171                 return dsa_slave_port_upper_event(dev, event, ptr);
1172         }
1173
1174         return NOTIFY_DONE;
1175 }
1176
1177 int dsa_slave_netdevice_event(struct notifier_block *unused,
1178                               unsigned long event, void *ptr)
1179 {
1180         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1181
1182         if (dsa_slave_dev_check(dev))
1183                 return dsa_slave_port_event(dev, event, ptr);
1184
1185         return NOTIFY_DONE;
1186 }