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.%d",
  53                  ds->dst->tree, ds->index);
  54         ds->slave_mii_bus->parent = ds->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
 211         if (switchdev_trans_ph_prepare(trans)) {
 212                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 213                         return -EOPNOTSUPP;
 214
 215                 return ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 216         }
 217
 218         ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 219
 220         return 0;
 221 }
 222
 223 static int dsa_slave_port_vlan_del(struct net_device *dev,
 224                                    const struct switchdev_obj_port_vlan *vlan)
 225 {
 226         struct dsa_slave_priv *p = netdev_priv(dev);
 227         struct dsa_switch *ds = p->parent;
 228
 229         if (!ds->drv->port_vlan_del)
 230                 return -EOPNOTSUPP;
 231
 232         return ds->drv->port_vlan_del(ds, p->port, vlan);
 233 }
 234
 235 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 236                                     struct switchdev_obj_port_vlan *vlan,
 237                                     switchdev_obj_dump_cb_t *cb)
 238 {
 239         struct dsa_slave_priv *p = netdev_priv(dev);
 240         struct dsa_switch *ds = p->parent;
 241
 242         if (ds->drv->port_vlan_dump)
 243                 return ds->drv->port_vlan_dump(ds, p->port, vlan, cb);
 244
 245         return -EOPNOTSUPP;
 246 }
 247
 248 static int dsa_slave_port_fdb_add(struct net_device *dev,
 249                                   const struct switchdev_obj_port_fdb *fdb,
 250                                   struct switchdev_trans *trans)
 251 {
 252         struct dsa_slave_priv *p = netdev_priv(dev);
 253         struct dsa_switch *ds = p->parent;
 254
 255         if (switchdev_trans_ph_prepare(trans)) {
 256                 if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 257                         return -EOPNOTSUPP;
 258
 259                 return ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 260         }
 261
 262         ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 263
 264         return 0;
 265 }
 266
 267 static int dsa_slave_port_fdb_del(struct net_device *dev,
 268                                   const struct switchdev_obj_port_fdb *fdb)
 269 {
 270         struct dsa_slave_priv *p = netdev_priv(dev);
 271         struct dsa_switch *ds = p->parent;
 272         int ret = -EOPNOTSUPP;
 273
 274         if (ds->drv->port_fdb_del)
 275                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 276
 277         return ret;
 278 }
 279
 280 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 281                                    struct switchdev_obj_port_fdb *fdb,
 282                                    switchdev_obj_dump_cb_t *cb)
 283 {
 284         struct dsa_slave_priv *p = netdev_priv(dev);
 285         struct dsa_switch *ds = p->parent;
 286
 287         if (ds->drv->port_fdb_dump)
 288                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 289
 290         return -EOPNOTSUPP;
 291 }
 292
 293 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 294 {
 295         struct dsa_slave_priv *p = netdev_priv(dev);
 296
 297         if (p->phy != NULL)
 298                 return phy_mii_ioctl(p->phy, ifr, cmd);
 299
 300         return -EOPNOTSUPP;
 301 }
 302
 303 static int dsa_slave_stp_state_set(struct net_device *dev,
 304                                    const struct switchdev_attr *attr,
 305                                    struct switchdev_trans *trans)
 306 {
 307         struct dsa_slave_priv *p = netdev_priv(dev);
 308         struct dsa_switch *ds = p->parent;
 309
 310         if (switchdev_trans_ph_prepare(trans))
 311                 return ds->drv->port_stp_state_set ? 0 : -EOPNOTSUPP;
 312
 313         ds->drv->port_stp_state_set(ds, p->port, attr->u.stp_state);
 314
 315         return 0;
 316 }
 317
 318 static int dsa_slave_vlan_filtering(struct net_device *dev,
 319                                     const struct switchdev_attr *attr,
 320                                     struct switchdev_trans *trans)
 321 {
 322         struct dsa_slave_priv *p = netdev_priv(dev);
 323         struct dsa_switch *ds = p->parent;
 324
 325         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 326         if (switchdev_trans_ph_prepare(trans))
 327                 return 0;
 328
 329         if (ds->drv->port_vlan_filtering)
 330                 return ds->drv->port_vlan_filtering(ds, p->port,
 331                                                     attr->u.vlan_filtering);
 332
 333         return 0;
 334 }
 335
 336 static int dsa_fastest_ageing_time(struct dsa_switch *ds,
 337                                    unsigned int ageing_time)
 338 {
 339         int i;
 340
 341         for (i = 0; i < DSA_MAX_PORTS; ++i) {
 342                 struct dsa_port *dp = &ds->ports[i];
 343
 344                 if (dp && dp->ageing_time && dp->ageing_time < ageing_time)
 345                         ageing_time = dp->ageing_time;
 346         }
 347
 348         return ageing_time;
 349 }
 350
 351 static int dsa_slave_ageing_time(struct net_device *dev,
 352                                  const struct switchdev_attr *attr,
 353                                  struct switchdev_trans *trans)
 354 {
 355         struct dsa_slave_priv *p = netdev_priv(dev);
 356         struct dsa_switch *ds = p->parent;
 357         unsigned long ageing_jiffies = clock_t_to_jiffies(attr->u.ageing_time);
 358         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 359
 360         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 361         if (switchdev_trans_ph_prepare(trans))
 362                 return 0;
 363
 364         /* Keep the fastest ageing time in case of multiple bridges */
 365         ds->ports[p->port].ageing_time = ageing_time;
 366         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 367
 368         if (ds->drv->set_ageing_time)
 369                 return ds->drv->set_ageing_time(ds, ageing_time);
 370
 371         return 0;
 372 }
 373
 374 static int dsa_slave_port_attr_set(struct net_device *dev,
 375                                    const struct switchdev_attr *attr,
 376                                    struct switchdev_trans *trans)
 377 {
 378         int ret;
 379
 380         switch (attr->id) {
 381         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 382                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 383                 break;
 384         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 385                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 386                 break;
 387         case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 388                 ret = dsa_slave_ageing_time(dev, attr, trans);
 389                 break;
 390         default:
 391                 ret = -EOPNOTSUPP;
 392                 break;
 393         }
 394
 395         return ret;
 396 }
 397
 398 static int dsa_slave_port_obj_add(struct net_device *dev,
 399                                   const struct switchdev_obj *obj,
 400                                   struct switchdev_trans *trans)
 401 {
 402         int err;
 403
 404         /* For the prepare phase, ensure the full set of changes is feasable in
 405          * one go in order to signal a failure properly. If an operation is not
 406          * supported, return -EOPNOTSUPP.
 407          */
 408
 409         switch (obj->id) {
 410         case SWITCHDEV_OBJ_ID_PORT_FDB:
 411                 err = dsa_slave_port_fdb_add(dev,
 412                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 413                                              trans);
 414                 break;
 415         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 416                 err = dsa_slave_port_vlan_add(dev,
 417                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 418                                               trans);
 419                 break;
 420         default:
 421                 err = -EOPNOTSUPP;
 422                 break;
 423         }
 424
 425         return err;
 426 }
 427
 428 static int dsa_slave_port_obj_del(struct net_device *dev,
 429                                   const struct switchdev_obj *obj)
 430 {
 431         int err;
 432
 433         switch (obj->id) {
 434         case SWITCHDEV_OBJ_ID_PORT_FDB:
 435                 err = dsa_slave_port_fdb_del(dev,
 436                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 437                 break;
 438         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 439                 err = dsa_slave_port_vlan_del(dev,
 440                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 441                 break;
 442         default:
 443                 err = -EOPNOTSUPP;
 444                 break;
 445         }
 446
 447         return err;
 448 }
 449
 450 static int dsa_slave_port_obj_dump(struct net_device *dev,
 451                                    struct switchdev_obj *obj,
 452                                    switchdev_obj_dump_cb_t *cb)
 453 {
 454         int err;
 455
 456         switch (obj->id) {
 457         case SWITCHDEV_OBJ_ID_PORT_FDB:
 458                 err = dsa_slave_port_fdb_dump(dev,
 459                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 460                                               cb);
 461                 break;
 462         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 463                 err = dsa_slave_port_vlan_dump(dev,
 464                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 465                                                cb);
 466                 break;
 467         default:
 468                 err = -EOPNOTSUPP;
 469                 break;
 470         }
 471
 472         return err;
 473 }
 474
 475 static int dsa_slave_bridge_port_join(struct net_device *dev,
 476                                       struct net_device *br)
 477 {
 478         struct dsa_slave_priv *p = netdev_priv(dev);
 479         struct dsa_switch *ds = p->parent;
 480         int ret = -EOPNOTSUPP;
 481
 482         p->bridge_dev = br;
 483
 484         if (ds->drv->port_bridge_join)
 485                 ret = ds->drv->port_bridge_join(ds, p->port, br);
 486
 487         return ret == -EOPNOTSUPP ? 0 : ret;
 488 }
 489
 490 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 491 {
 492         struct dsa_slave_priv *p = netdev_priv(dev);
 493         struct dsa_switch *ds = p->parent;
 494
 495
 496         if (ds->drv->port_bridge_leave)
 497                 ds->drv->port_bridge_leave(ds, p->port);
 498
 499         p->bridge_dev = NULL;
 500
 501         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 502          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 503          */
 504         if (ds->drv->port_stp_state_set)
 505                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
 506 }
 507
 508 static int dsa_slave_port_attr_get(struct net_device *dev,
 509                                    struct switchdev_attr *attr)
 510 {
 511         struct dsa_slave_priv *p = netdev_priv(dev);
 512         struct dsa_switch *ds = p->parent;
 513
 514         switch (attr->id) {
 515         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 516                 attr->u.ppid.id_len = sizeof(ds->index);
 517                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 518                 break;
 519         default:
 520                 return -EOPNOTSUPP;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 527                                                struct sk_buff *skb)
 528 {
 529 #ifdef CONFIG_NET_POLL_CONTROLLER
 530         if (p->netpoll)
 531                 netpoll_send_skb(p->netpoll, skb);
 532 #else
 533         BUG();
 534 #endif
 535         return NETDEV_TX_OK;
 536 }
 537
 538 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 539 {
 540         struct dsa_slave_priv *p = netdev_priv(dev);
 541         struct sk_buff *nskb;
 542
 543         dev->stats.tx_packets++;
 544         dev->stats.tx_bytes += skb->len;
 545
 546         /* Transmit function may have to reallocate the original SKB */
 547         nskb = p->xmit(skb, dev);
 548         if (!nskb)
 549                 return NETDEV_TX_OK;
 550
 551         /* SKB for netpoll still need to be mangled with the protocol-specific
 552          * tag to be successfully transmitted
 553          */
 554         if (unlikely(netpoll_tx_running(dev)))
 555                 return dsa_netpoll_send_skb(p, nskb);
 556
 557         /* Queue the SKB for transmission on the parent interface, but
 558          * do not modify its EtherType
 559          */
 560         nskb->dev = p->parent->dst->master_netdev;
 561         dev_queue_xmit(nskb);
 562
 563         return NETDEV_TX_OK;
 564 }
 565
 566 /* ethtool operations *******************************************************/
 567 static int
 568 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 569 {
 570         struct dsa_slave_priv *p = netdev_priv(dev);
 571         int err;
 572
 573         err = -EOPNOTSUPP;
 574         if (p->phy != NULL) {
 575                 err = phy_read_status(p->phy);
 576                 if (err == 0)
 577                         err = phy_ethtool_gset(p->phy, cmd);
 578         }
 579
 580         return err;
 581 }
 582
 583 static int
 584 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 585 {
 586         struct dsa_slave_priv *p = netdev_priv(dev);
 587
 588         if (p->phy != NULL)
 589                 return phy_ethtool_sset(p->phy, cmd);
 590
 591         return -EOPNOTSUPP;
 592 }
 593
 594 static void dsa_slave_get_drvinfo(struct net_device *dev,
 595                                   struct ethtool_drvinfo *drvinfo)
 596 {
 597         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 598         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 599         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 600         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 601 }
 602
 603 static int dsa_slave_get_regs_len(struct net_device *dev)
 604 {
 605         struct dsa_slave_priv *p = netdev_priv(dev);
 606         struct dsa_switch *ds = p->parent;
 607
 608         if (ds->drv->get_regs_len)
 609                 return ds->drv->get_regs_len(ds, p->port);
 610
 611         return -EOPNOTSUPP;
 612 }
 613
 614 static void
 615 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 616 {
 617         struct dsa_slave_priv *p = netdev_priv(dev);
 618         struct dsa_switch *ds = p->parent;
 619
 620         if (ds->drv->get_regs)
 621                 ds->drv->get_regs(ds, p->port, regs, _p);
 622 }
 623
 624 static int dsa_slave_nway_reset(struct net_device *dev)
 625 {
 626         struct dsa_slave_priv *p = netdev_priv(dev);
 627
 628         if (p->phy != NULL)
 629                 return genphy_restart_aneg(p->phy);
 630
 631         return -EOPNOTSUPP;
 632 }
 633
 634 static u32 dsa_slave_get_link(struct net_device *dev)
 635 {
 636         struct dsa_slave_priv *p = netdev_priv(dev);
 637
 638         if (p->phy != NULL) {
 639                 genphy_update_link(p->phy);
 640                 return p->phy->link;
 641         }
 642
 643         return -EOPNOTSUPP;
 644 }
 645
 646 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 647 {
 648         struct dsa_slave_priv *p = netdev_priv(dev);
 649         struct dsa_switch *ds = p->parent;
 650
 651         if (ds->cd && ds->cd->eeprom_len)
 652                 return ds->cd->eeprom_len;
 653
 654         if (ds->drv->get_eeprom_len)
 655                 return ds->drv->get_eeprom_len(ds);
 656
 657         return 0;
 658 }
 659
 660 static int dsa_slave_get_eeprom(struct net_device *dev,
 661                                 struct ethtool_eeprom *eeprom, u8 *data)
 662 {
 663         struct dsa_slave_priv *p = netdev_priv(dev);
 664         struct dsa_switch *ds = p->parent;
 665
 666         if (ds->drv->get_eeprom)
 667                 return ds->drv->get_eeprom(ds, eeprom, data);
 668
 669         return -EOPNOTSUPP;
 670 }
 671
 672 static int dsa_slave_set_eeprom(struct net_device *dev,
 673                                 struct ethtool_eeprom *eeprom, u8 *data)
 674 {
 675         struct dsa_slave_priv *p = netdev_priv(dev);
 676         struct dsa_switch *ds = p->parent;
 677
 678         if (ds->drv->set_eeprom)
 679                 return ds->drv->set_eeprom(ds, eeprom, data);
 680
 681         return -EOPNOTSUPP;
 682 }
 683
 684 static void dsa_slave_get_strings(struct net_device *dev,
 685                                   uint32_t stringset, uint8_t *data)
 686 {
 687         struct dsa_slave_priv *p = netdev_priv(dev);
 688         struct dsa_switch *ds = p->parent;
 689
 690         if (stringset == ETH_SS_STATS) {
 691                 int len = ETH_GSTRING_LEN;
 692
 693                 strncpy(data, "tx_packets", len);
 694                 strncpy(data + len, "tx_bytes", len);
 695                 strncpy(data + 2 * len, "rx_packets", len);
 696                 strncpy(data + 3 * len, "rx_bytes", len);
 697                 if (ds->drv->get_strings != NULL)
 698                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 699         }
 700 }
 701
 702 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 703                                            struct ethtool_stats *stats,
 704                                            uint64_t *data)
 705 {
 706         struct dsa_switch_tree *dst = dev->dsa_ptr;
 707         struct dsa_switch *ds = dst->ds[0];
 708         s8 cpu_port = dst->cpu_port;
 709         int count = 0;
 710
 711         if (dst->master_ethtool_ops.get_sset_count) {
 712                 count = dst->master_ethtool_ops.get_sset_count(dev,
 713                                                                ETH_SS_STATS);
 714                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 715         }
 716
 717         if (ds->drv->get_ethtool_stats)
 718                 ds->drv->get_ethtool_stats(ds, cpu_port, data + count);
 719 }
 720
 721 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 722 {
 723         struct dsa_switch_tree *dst = dev->dsa_ptr;
 724         struct dsa_switch *ds = dst->ds[0];
 725         int count = 0;
 726
 727         if (dst->master_ethtool_ops.get_sset_count)
 728                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 729
 730         if (sset == ETH_SS_STATS && ds->drv->get_sset_count)
 731                 count += ds->drv->get_sset_count(ds);
 732
 733         return count;
 734 }
 735
 736 static void dsa_cpu_port_get_strings(struct net_device *dev,
 737                                      uint32_t stringset, uint8_t *data)
 738 {
 739         struct dsa_switch_tree *dst = dev->dsa_ptr;
 740         struct dsa_switch *ds = dst->ds[0];
 741         s8 cpu_port = dst->cpu_port;
 742         int len = ETH_GSTRING_LEN;
 743         int mcount = 0, count;
 744         unsigned int i;
 745         uint8_t pfx[4];
 746         uint8_t *ndata;
 747
 748         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 749         /* We do not want to be NULL-terminated, since this is a prefix */
 750         pfx[sizeof(pfx) - 1] = '_';
 751
 752         if (dst->master_ethtool_ops.get_sset_count) {
 753                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 754                                                                 ETH_SS_STATS);
 755                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 756         }
 757
 758         if (stringset == ETH_SS_STATS && ds->drv->get_strings) {
 759                 ndata = data + mcount * len;
 760                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 761                  * the output after to prepend our CPU port prefix we
 762                  * constructed earlier
 763                  */
 764                 ds->drv->get_strings(ds, cpu_port, ndata);
 765                 count = ds->drv->get_sset_count(ds);
 766                 for (i = 0; i < count; i++) {
 767                         memmove(ndata + (i * len + sizeof(pfx)),
 768                                 ndata + i * len, len - sizeof(pfx));
 769                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 770                 }
 771         }
 772 }
 773
 774 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 775                                         struct ethtool_stats *stats,
 776                                         uint64_t *data)
 777 {
 778         struct dsa_slave_priv *p = netdev_priv(dev);
 779         struct dsa_switch *ds = p->parent;
 780
 781         data[0] = dev->stats.tx_packets;
 782         data[1] = dev->stats.tx_bytes;
 783         data[2] = dev->stats.rx_packets;
 784         data[3] = dev->stats.rx_bytes;
 785         if (ds->drv->get_ethtool_stats != NULL)
 786                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 787 }
 788
 789 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 790 {
 791         struct dsa_slave_priv *p = netdev_priv(dev);
 792         struct dsa_switch *ds = p->parent;
 793
 794         if (sset == ETH_SS_STATS) {
 795                 int count;
 796
 797                 count = 4;
 798                 if (ds->drv->get_sset_count != NULL)
 799                         count += ds->drv->get_sset_count(ds);
 800
 801                 return count;
 802         }
 803
 804         return -EOPNOTSUPP;
 805 }
 806
 807 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 808 {
 809         struct dsa_slave_priv *p = netdev_priv(dev);
 810         struct dsa_switch *ds = p->parent;
 811
 812         if (ds->drv->get_wol)
 813                 ds->drv->get_wol(ds, p->port, w);
 814 }
 815
 816 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 817 {
 818         struct dsa_slave_priv *p = netdev_priv(dev);
 819         struct dsa_switch *ds = p->parent;
 820         int ret = -EOPNOTSUPP;
 821
 822         if (ds->drv->set_wol)
 823                 ret = ds->drv->set_wol(ds, p->port, w);
 824
 825         return ret;
 826 }
 827
 828 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 829 {
 830         struct dsa_slave_priv *p = netdev_priv(dev);
 831         struct dsa_switch *ds = p->parent;
 832         int ret;
 833
 834         if (!ds->drv->set_eee)
 835                 return -EOPNOTSUPP;
 836
 837         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 838         if (ret)
 839                 return ret;
 840
 841         if (p->phy)
 842                 ret = phy_ethtool_set_eee(p->phy, e);
 843
 844         return ret;
 845 }
 846
 847 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 848 {
 849         struct dsa_slave_priv *p = netdev_priv(dev);
 850         struct dsa_switch *ds = p->parent;
 851         int ret;
 852
 853         if (!ds->drv->get_eee)
 854                 return -EOPNOTSUPP;
 855
 856         ret = ds->drv->get_eee(ds, p->port, e);
 857         if (ret)
 858                 return ret;
 859
 860         if (p->phy)
 861                 ret = phy_ethtool_get_eee(p->phy, e);
 862
 863         return ret;
 864 }
 865
 866 #ifdef CONFIG_NET_POLL_CONTROLLER
 867 static int dsa_slave_netpoll_setup(struct net_device *dev,
 868                                    struct netpoll_info *ni)
 869 {
 870         struct dsa_slave_priv *p = netdev_priv(dev);
 871         struct dsa_switch *ds = p->parent;
 872         struct net_device *master = ds->dst->master_netdev;
 873         struct netpoll *netpoll;
 874         int err = 0;
 875
 876         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 877         if (!netpoll)
 878                 return -ENOMEM;
 879
 880         err = __netpoll_setup(netpoll, master);
 881         if (err) {
 882                 kfree(netpoll);
 883                 goto out;
 884         }
 885
 886         p->netpoll = netpoll;
 887 out:
 888         return err;
 889 }
 890
 891 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 892 {
 893         struct dsa_slave_priv *p = netdev_priv(dev);
 894         struct netpoll *netpoll = p->netpoll;
 895
 896         if (!netpoll)
 897                 return;
 898
 899         p->netpoll = NULL;
 900
 901         __netpoll_free_async(netpoll);
 902 }
 903
 904 static void dsa_slave_poll_controller(struct net_device *dev)
 905 {
 906 }
 907 #endif
 908
 909 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
 910 {
 911         ops->get_sset_count = dsa_cpu_port_get_sset_count;
 912         ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
 913         ops->get_strings = dsa_cpu_port_get_strings;
 914 }
 915
 916 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 917         .get_settings           = dsa_slave_get_settings,
 918         .set_settings           = dsa_slave_set_settings,
 919         .get_drvinfo            = dsa_slave_get_drvinfo,
 920         .get_regs_len           = dsa_slave_get_regs_len,
 921         .get_regs               = dsa_slave_get_regs,
 922         .nway_reset             = dsa_slave_nway_reset,
 923         .get_link               = dsa_slave_get_link,
 924         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 925         .get_eeprom             = dsa_slave_get_eeprom,
 926         .set_eeprom             = dsa_slave_set_eeprom,
 927         .get_strings            = dsa_slave_get_strings,
 928         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 929         .get_sset_count         = dsa_slave_get_sset_count,
 930         .set_wol                = dsa_slave_set_wol,
 931         .get_wol                = dsa_slave_get_wol,
 932         .set_eee                = dsa_slave_set_eee,
 933         .get_eee                = dsa_slave_get_eee,
 934 };
 935
 936 static const struct net_device_ops dsa_slave_netdev_ops = {
 937         .ndo_open               = dsa_slave_open,
 938         .ndo_stop               = dsa_slave_close,
 939         .ndo_start_xmit         = dsa_slave_xmit,
 940         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 941         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 942         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 943         .ndo_fdb_add            = switchdev_port_fdb_add,
 944         .ndo_fdb_del            = switchdev_port_fdb_del,
 945         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 946         .ndo_do_ioctl           = dsa_slave_ioctl,
 947         .ndo_get_iflink         = dsa_slave_get_iflink,
 948 #ifdef CONFIG_NET_POLL_CONTROLLER
 949         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 950         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 951         .ndo_poll_controller    = dsa_slave_poll_controller,
 952 #endif
 953         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 954         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 955         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 956 };
 957
 958 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 959         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 960         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 961         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 962         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 963         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 964 };
 965
 966 static struct device_type dsa_type = {
 967         .name   = "dsa",
 968 };
 969
 970 static void dsa_slave_adjust_link(struct net_device *dev)
 971 {
 972         struct dsa_slave_priv *p = netdev_priv(dev);
 973         struct dsa_switch *ds = p->parent;
 974         unsigned int status_changed = 0;
 975
 976         if (p->old_link != p->phy->link) {
 977                 status_changed = 1;
 978                 p->old_link = p->phy->link;
 979         }
 980
 981         if (p->old_duplex != p->phy->duplex) {
 982                 status_changed = 1;
 983                 p->old_duplex = p->phy->duplex;
 984         }
 985
 986         if (p->old_pause != p->phy->pause) {
 987                 status_changed = 1;
 988                 p->old_pause = p->phy->pause;
 989         }
 990
 991         if (ds->drv->adjust_link && status_changed)
 992                 ds->drv->adjust_link(ds, p->port, p->phy);
 993
 994         if (status_changed)
 995                 phy_print_status(p->phy);
 996 }
 997
 998 static int dsa_slave_fixed_link_update(struct net_device *dev,
 999                                        struct fixed_phy_status *status)
1000 {
1001         struct dsa_slave_priv *p;
1002         struct dsa_switch *ds;
1003
1004         if (dev) {
1005                 p = netdev_priv(dev);
1006                 ds = p->parent;
1007                 if (ds->drv->fixed_link_update)
1008                         ds->drv->fixed_link_update(ds, p->port, status);
1009         }
1010
1011         return 0;
1012 }
1013
1014 /* slave device setup *******************************************************/
1015 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1016                                  struct net_device *slave_dev,
1017                                  int addr)
1018 {
1019         struct dsa_switch *ds = p->parent;
1020
1021         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1022         if (!p->phy) {
1023                 netdev_err(slave_dev, "no phy at %d\n", addr);
1024                 return -ENODEV;
1025         }
1026
1027         /* Use already configured phy mode */
1028         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1029                 p->phy_interface = p->phy->interface;
1030         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1031                            p->phy_interface);
1032
1033         return 0;
1034 }
1035
1036 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1037                                 struct net_device *slave_dev)
1038 {
1039         struct dsa_switch *ds = p->parent;
1040         struct device_node *phy_dn, *port_dn;
1041         bool phy_is_fixed = false;
1042         u32 phy_flags = 0;
1043         int mode, ret;
1044
1045         port_dn = ds->ports[p->port].dn;
1046         mode = of_get_phy_mode(port_dn);
1047         if (mode < 0)
1048                 mode = PHY_INTERFACE_MODE_NA;
1049         p->phy_interface = mode;
1050
1051         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1052         if (of_phy_is_fixed_link(port_dn)) {
1053                 /* In the case of a fixed PHY, the DT node associated
1054                  * to the fixed PHY is the Port DT node
1055                  */
1056                 ret = of_phy_register_fixed_link(port_dn);
1057                 if (ret) {
1058                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1059                         return ret;
1060                 }
1061                 phy_is_fixed = true;
1062                 phy_dn = port_dn;
1063         }
1064
1065         if (ds->drv->get_phy_flags)
1066                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1067
1068         if (phy_dn) {
1069                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1070
1071                 /* If this PHY address is part of phys_mii_mask, which means
1072                  * that we need to divert reads and writes to/from it, then we
1073                  * want to bind this device using the slave MII bus created by
1074                  * DSA to make that happen.
1075                  */
1076                 if (!phy_is_fixed && phy_id >= 0 &&
1077                     (ds->phys_mii_mask & (1 << phy_id))) {
1078                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1079                         if (ret) {
1080                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1081                                 return ret;
1082                         }
1083                 } else {
1084                         p->phy = of_phy_connect(slave_dev, phy_dn,
1085                                                 dsa_slave_adjust_link,
1086                                                 phy_flags,
1087                                                 p->phy_interface);
1088                 }
1089         }
1090
1091         if (p->phy && phy_is_fixed)
1092                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1093
1094         /* We could not connect to a designated PHY, so use the switch internal
1095          * MDIO bus instead
1096          */
1097         if (!p->phy) {
1098                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1099                 if (ret) {
1100                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1101                         return ret;
1102                 }
1103         }
1104
1105         phy_attached_info(p->phy);
1106
1107         return 0;
1108 }
1109
1110 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1111 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1112                                             struct netdev_queue *txq,
1113                                             void *_unused)
1114 {
1115         lockdep_set_class(&txq->_xmit_lock,
1116                           &dsa_slave_netdev_xmit_lock_key);
1117 }
1118
1119 int dsa_slave_suspend(struct net_device *slave_dev)
1120 {
1121         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1122
1123         if (p->phy) {
1124                 phy_stop(p->phy);
1125                 p->old_pause = -1;
1126                 p->old_link = -1;
1127                 p->old_duplex = -1;
1128                 phy_suspend(p->phy);
1129         }
1130
1131         return 0;
1132 }
1133
1134 int dsa_slave_resume(struct net_device *slave_dev)
1135 {
1136         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1137
1138         netif_device_attach(slave_dev);
1139
1140         if (p->phy) {
1141                 phy_resume(p->phy);
1142                 phy_start(p->phy);
1143         }
1144
1145         return 0;
1146 }
1147
1148 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1149                      int port, const char *name)
1150 {
1151         struct dsa_switch_tree *dst = ds->dst;
1152         struct net_device *master;
1153         struct net_device *slave_dev;
1154         struct dsa_slave_priv *p;
1155         int ret;
1156
1157         master = ds->dst->master_netdev;
1158         if (ds->master_netdev)
1159                 master = ds->master_netdev;
1160
1161         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1162                                  NET_NAME_UNKNOWN, ether_setup);
1163         if (slave_dev == NULL)
1164                 return -ENOMEM;
1165
1166         slave_dev->features = master->vlan_features;
1167         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1168         eth_hw_addr_inherit(slave_dev, master);
1169         slave_dev->priv_flags |= IFF_NO_QUEUE;
1170         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1171         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1172         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1173
1174         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1175                                  NULL);
1176
1177         SET_NETDEV_DEV(slave_dev, parent);
1178         slave_dev->dev.of_node = ds->ports[port].dn;
1179         slave_dev->vlan_features = master->vlan_features;
1180
1181         p = netdev_priv(slave_dev);
1182         p->parent = ds;
1183         p->port = port;
1184         p->xmit = dst->tag_ops->xmit;
1185
1186         p->old_pause = -1;
1187         p->old_link = -1;
1188         p->old_duplex = -1;
1189
1190         ds->ports[port].netdev = slave_dev;
1191         ret = register_netdev(slave_dev);
1192         if (ret) {
1193                 netdev_err(master, "error %d registering interface %s\n",
1194                            ret, slave_dev->name);
1195                 ds->ports[port].netdev = NULL;
1196                 free_netdev(slave_dev);
1197                 return ret;
1198         }
1199
1200         netif_carrier_off(slave_dev);
1201
1202         ret = dsa_slave_phy_setup(p, slave_dev);
1203         if (ret) {
1204                 netdev_err(master, "error %d setting up slave phy\n", ret);
1205                 unregister_netdev(slave_dev);
1206                 free_netdev(slave_dev);
1207                 return ret;
1208         }
1209
1210         return 0;
1211 }
1212
1213 void dsa_slave_destroy(struct net_device *slave_dev)
1214 {
1215         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1216
1217         netif_carrier_off(slave_dev);
1218         if (p->phy)
1219                 phy_disconnect(p->phy);
1220         unregister_netdev(slave_dev);
1221         free_netdev(slave_dev);
1222 }
1223
1224 static bool dsa_slave_dev_check(struct net_device *dev)
1225 {
1226         return dev->netdev_ops == &dsa_slave_netdev_ops;
1227 }
1228
1229 static int dsa_slave_port_upper_event(struct net_device *dev,
1230                                       unsigned long event, void *ptr)
1231 {
1232         struct netdev_notifier_changeupper_info *info = ptr;
1233         struct net_device *upper = info->upper_dev;
1234         int err = 0;
1235
1236         switch (event) {
1237         case NETDEV_CHANGEUPPER:
1238                 if (netif_is_bridge_master(upper)) {
1239                         if (info->linking)
1240                                 err = dsa_slave_bridge_port_join(dev, upper);
1241                         else
1242                                 dsa_slave_bridge_port_leave(dev);
1243                 }
1244
1245                 break;
1246         }
1247
1248         return notifier_from_errno(err);
1249 }
1250
1251 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1252                                 void *ptr)
1253 {
1254         switch (event) {
1255         case NETDEV_CHANGEUPPER:
1256                 return dsa_slave_port_upper_event(dev, event, ptr);
1257         }
1258
1259         return NOTIFY_DONE;
1260 }
1261
1262 int dsa_slave_netdevice_event(struct notifier_block *unused,
1263                               unsigned long event, void *ptr)
1264 {
1265         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1266
1267         if (dsa_slave_dev_check(dev))
1268                 return dsa_slave_port_event(dev, event, ptr);
1269
1270         return NOTIFY_DONE;
1271 }