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->cd->sw_addr);
  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_slave_port_attr_set(struct net_device *dev,
 337                                    const struct switchdev_attr *attr,
 338                                    struct switchdev_trans *trans)
 339 {
 340         int ret;
 341
 342         switch (attr->id) {
 343         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 344                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 345                 break;
 346         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 347                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 348                 break;
 349         default:
 350                 ret = -EOPNOTSUPP;
 351                 break;
 352         }
 353
 354         return ret;
 355 }
 356
 357 static int dsa_slave_port_obj_add(struct net_device *dev,
 358                                   const struct switchdev_obj *obj,
 359                                   struct switchdev_trans *trans)
 360 {
 361         int err;
 362
 363         /* For the prepare phase, ensure the full set of changes is feasable in
 364          * one go in order to signal a failure properly. If an operation is not
 365          * supported, return -EOPNOTSUPP.
 366          */
 367
 368         switch (obj->id) {
 369         case SWITCHDEV_OBJ_ID_PORT_FDB:
 370                 err = dsa_slave_port_fdb_add(dev,
 371                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 372                                              trans);
 373                 break;
 374         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 375                 err = dsa_slave_port_vlan_add(dev,
 376                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 377                                               trans);
 378                 break;
 379         default:
 380                 err = -EOPNOTSUPP;
 381                 break;
 382         }
 383
 384         return err;
 385 }
 386
 387 static int dsa_slave_port_obj_del(struct net_device *dev,
 388                                   const struct switchdev_obj *obj)
 389 {
 390         int err;
 391
 392         switch (obj->id) {
 393         case SWITCHDEV_OBJ_ID_PORT_FDB:
 394                 err = dsa_slave_port_fdb_del(dev,
 395                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 396                 break;
 397         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 398                 err = dsa_slave_port_vlan_del(dev,
 399                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 400                 break;
 401         default:
 402                 err = -EOPNOTSUPP;
 403                 break;
 404         }
 405
 406         return err;
 407 }
 408
 409 static int dsa_slave_port_obj_dump(struct net_device *dev,
 410                                    struct switchdev_obj *obj,
 411                                    switchdev_obj_dump_cb_t *cb)
 412 {
 413         int err;
 414
 415         switch (obj->id) {
 416         case SWITCHDEV_OBJ_ID_PORT_FDB:
 417                 err = dsa_slave_port_fdb_dump(dev,
 418                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 419                                               cb);
 420                 break;
 421         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 422                 err = dsa_slave_port_vlan_dump(dev,
 423                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 424                                                cb);
 425                 break;
 426         default:
 427                 err = -EOPNOTSUPP;
 428                 break;
 429         }
 430
 431         return err;
 432 }
 433
 434 static int dsa_slave_bridge_port_join(struct net_device *dev,
 435                                       struct net_device *br)
 436 {
 437         struct dsa_slave_priv *p = netdev_priv(dev);
 438         struct dsa_switch *ds = p->parent;
 439         int ret = -EOPNOTSUPP;
 440
 441         p->bridge_dev = br;
 442
 443         if (ds->drv->port_bridge_join)
 444                 ret = ds->drv->port_bridge_join(ds, p->port, br);
 445
 446         return ret == -EOPNOTSUPP ? 0 : ret;
 447 }
 448
 449 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 450 {
 451         struct dsa_slave_priv *p = netdev_priv(dev);
 452         struct dsa_switch *ds = p->parent;
 453
 454
 455         if (ds->drv->port_bridge_leave)
 456                 ds->drv->port_bridge_leave(ds, p->port);
 457
 458         p->bridge_dev = NULL;
 459
 460         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 461          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 462          */
 463         if (ds->drv->port_stp_state_set)
 464                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
 465 }
 466
 467 static int dsa_slave_port_attr_get(struct net_device *dev,
 468                                    struct switchdev_attr *attr)
 469 {
 470         struct dsa_slave_priv *p = netdev_priv(dev);
 471         struct dsa_switch *ds = p->parent;
 472
 473         switch (attr->id) {
 474         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 475                 attr->u.ppid.id_len = sizeof(ds->index);
 476                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 477                 break;
 478         default:
 479                 return -EOPNOTSUPP;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 486                                                struct sk_buff *skb)
 487 {
 488 #ifdef CONFIG_NET_POLL_CONTROLLER
 489         if (p->netpoll)
 490                 netpoll_send_skb(p->netpoll, skb);
 491 #else
 492         BUG();
 493 #endif
 494         return NETDEV_TX_OK;
 495 }
 496
 497 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 498 {
 499         struct dsa_slave_priv *p = netdev_priv(dev);
 500         struct sk_buff *nskb;
 501
 502         dev->stats.tx_packets++;
 503         dev->stats.tx_bytes += skb->len;
 504
 505         /* Transmit function may have to reallocate the original SKB */
 506         nskb = p->xmit(skb, dev);
 507         if (!nskb)
 508                 return NETDEV_TX_OK;
 509
 510         /* SKB for netpoll still need to be mangled with the protocol-specific
 511          * tag to be successfully transmitted
 512          */
 513         if (unlikely(netpoll_tx_running(dev)))
 514                 return dsa_netpoll_send_skb(p, nskb);
 515
 516         /* Queue the SKB for transmission on the parent interface, but
 517          * do not modify its EtherType
 518          */
 519         nskb->dev = p->parent->dst->master_netdev;
 520         dev_queue_xmit(nskb);
 521
 522         return NETDEV_TX_OK;
 523 }
 524
 525 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 526                                             struct net_device *dev)
 527 {
 528         /* Just return the original SKB */
 529         return skb;
 530 }
 531
 532
 533 /* ethtool operations *******************************************************/
 534 static int
 535 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 536 {
 537         struct dsa_slave_priv *p = netdev_priv(dev);
 538         int err;
 539
 540         err = -EOPNOTSUPP;
 541         if (p->phy != NULL) {
 542                 err = phy_read_status(p->phy);
 543                 if (err == 0)
 544                         err = phy_ethtool_gset(p->phy, cmd);
 545         }
 546
 547         return err;
 548 }
 549
 550 static int
 551 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 552 {
 553         struct dsa_slave_priv *p = netdev_priv(dev);
 554
 555         if (p->phy != NULL)
 556                 return phy_ethtool_sset(p->phy, cmd);
 557
 558         return -EOPNOTSUPP;
 559 }
 560
 561 static void dsa_slave_get_drvinfo(struct net_device *dev,
 562                                   struct ethtool_drvinfo *drvinfo)
 563 {
 564         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 565         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 566         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 567         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 568 }
 569
 570 static int dsa_slave_get_regs_len(struct net_device *dev)
 571 {
 572         struct dsa_slave_priv *p = netdev_priv(dev);
 573         struct dsa_switch *ds = p->parent;
 574
 575         if (ds->drv->get_regs_len)
 576                 return ds->drv->get_regs_len(ds, p->port);
 577
 578         return -EOPNOTSUPP;
 579 }
 580
 581 static void
 582 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 583 {
 584         struct dsa_slave_priv *p = netdev_priv(dev);
 585         struct dsa_switch *ds = p->parent;
 586
 587         if (ds->drv->get_regs)
 588                 ds->drv->get_regs(ds, p->port, regs, _p);
 589 }
 590
 591 static int dsa_slave_nway_reset(struct net_device *dev)
 592 {
 593         struct dsa_slave_priv *p = netdev_priv(dev);
 594
 595         if (p->phy != NULL)
 596                 return genphy_restart_aneg(p->phy);
 597
 598         return -EOPNOTSUPP;
 599 }
 600
 601 static u32 dsa_slave_get_link(struct net_device *dev)
 602 {
 603         struct dsa_slave_priv *p = netdev_priv(dev);
 604
 605         if (p->phy != NULL) {
 606                 genphy_update_link(p->phy);
 607                 return p->phy->link;
 608         }
 609
 610         return -EOPNOTSUPP;
 611 }
 612
 613 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 614 {
 615         struct dsa_slave_priv *p = netdev_priv(dev);
 616         struct dsa_switch *ds = p->parent;
 617
 618         if (ds->cd && ds->cd->eeprom_len)
 619                 return ds->cd->eeprom_len;
 620
 621         if (ds->drv->get_eeprom_len)
 622                 return ds->drv->get_eeprom_len(ds);
 623
 624         return 0;
 625 }
 626
 627 static int dsa_slave_get_eeprom(struct net_device *dev,
 628                                 struct ethtool_eeprom *eeprom, u8 *data)
 629 {
 630         struct dsa_slave_priv *p = netdev_priv(dev);
 631         struct dsa_switch *ds = p->parent;
 632
 633         if (ds->drv->get_eeprom)
 634                 return ds->drv->get_eeprom(ds, eeprom, data);
 635
 636         return -EOPNOTSUPP;
 637 }
 638
 639 static int dsa_slave_set_eeprom(struct net_device *dev,
 640                                 struct ethtool_eeprom *eeprom, u8 *data)
 641 {
 642         struct dsa_slave_priv *p = netdev_priv(dev);
 643         struct dsa_switch *ds = p->parent;
 644
 645         if (ds->drv->set_eeprom)
 646                 return ds->drv->set_eeprom(ds, eeprom, data);
 647
 648         return -EOPNOTSUPP;
 649 }
 650
 651 static void dsa_slave_get_strings(struct net_device *dev,
 652                                   uint32_t stringset, uint8_t *data)
 653 {
 654         struct dsa_slave_priv *p = netdev_priv(dev);
 655         struct dsa_switch *ds = p->parent;
 656
 657         if (stringset == ETH_SS_STATS) {
 658                 int len = ETH_GSTRING_LEN;
 659
 660                 strncpy(data, "tx_packets", len);
 661                 strncpy(data + len, "tx_bytes", len);
 662                 strncpy(data + 2 * len, "rx_packets", len);
 663                 strncpy(data + 3 * len, "rx_bytes", len);
 664                 if (ds->drv->get_strings != NULL)
 665                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 666         }
 667 }
 668
 669 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 670                                            struct ethtool_stats *stats,
 671                                            uint64_t *data)
 672 {
 673         struct dsa_switch_tree *dst = dev->dsa_ptr;
 674         struct dsa_switch *ds = dst->ds[0];
 675         s8 cpu_port = dst->cpu_port;
 676         int count = 0;
 677
 678         if (dst->master_ethtool_ops.get_sset_count) {
 679                 count = dst->master_ethtool_ops.get_sset_count(dev,
 680                                                                ETH_SS_STATS);
 681                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 682         }
 683
 684         if (ds->drv->get_ethtool_stats)
 685                 ds->drv->get_ethtool_stats(ds, cpu_port, data + count);
 686 }
 687
 688 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 689 {
 690         struct dsa_switch_tree *dst = dev->dsa_ptr;
 691         struct dsa_switch *ds = dst->ds[0];
 692         int count = 0;
 693
 694         if (dst->master_ethtool_ops.get_sset_count)
 695                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 696
 697         if (sset == ETH_SS_STATS && ds->drv->get_sset_count)
 698                 count += ds->drv->get_sset_count(ds);
 699
 700         return count;
 701 }
 702
 703 static void dsa_cpu_port_get_strings(struct net_device *dev,
 704                                      uint32_t stringset, uint8_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 len = ETH_GSTRING_LEN;
 710         int mcount = 0, count;
 711         unsigned int i;
 712         uint8_t pfx[4];
 713         uint8_t *ndata;
 714
 715         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 716         /* We do not want to be NULL-terminated, since this is a prefix */
 717         pfx[sizeof(pfx) - 1] = '_';
 718
 719         if (dst->master_ethtool_ops.get_sset_count) {
 720                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 721                                                                 ETH_SS_STATS);
 722                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 723         }
 724
 725         if (stringset == ETH_SS_STATS && ds->drv->get_strings) {
 726                 ndata = data + mcount * len;
 727                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 728                  * the output after to prepend our CPU port prefix we
 729                  * constructed earlier
 730                  */
 731                 ds->drv->get_strings(ds, cpu_port, ndata);
 732                 count = ds->drv->get_sset_count(ds);
 733                 for (i = 0; i < count; i++) {
 734                         memmove(ndata + (i * len + sizeof(pfx)),
 735                                 ndata + i * len, len - sizeof(pfx));
 736                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 737                 }
 738         }
 739 }
 740
 741 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 742                                         struct ethtool_stats *stats,
 743                                         uint64_t *data)
 744 {
 745         struct dsa_slave_priv *p = netdev_priv(dev);
 746         struct dsa_switch *ds = p->parent;
 747
 748         data[0] = dev->stats.tx_packets;
 749         data[1] = dev->stats.tx_bytes;
 750         data[2] = dev->stats.rx_packets;
 751         data[3] = dev->stats.rx_bytes;
 752         if (ds->drv->get_ethtool_stats != NULL)
 753                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 754 }
 755
 756 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 757 {
 758         struct dsa_slave_priv *p = netdev_priv(dev);
 759         struct dsa_switch *ds = p->parent;
 760
 761         if (sset == ETH_SS_STATS) {
 762                 int count;
 763
 764                 count = 4;
 765                 if (ds->drv->get_sset_count != NULL)
 766                         count += ds->drv->get_sset_count(ds);
 767
 768                 return count;
 769         }
 770
 771         return -EOPNOTSUPP;
 772 }
 773
 774 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 775 {
 776         struct dsa_slave_priv *p = netdev_priv(dev);
 777         struct dsa_switch *ds = p->parent;
 778
 779         if (ds->drv->get_wol)
 780                 ds->drv->get_wol(ds, p->port, w);
 781 }
 782
 783 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 784 {
 785         struct dsa_slave_priv *p = netdev_priv(dev);
 786         struct dsa_switch *ds = p->parent;
 787         int ret = -EOPNOTSUPP;
 788
 789         if (ds->drv->set_wol)
 790                 ret = ds->drv->set_wol(ds, p->port, w);
 791
 792         return ret;
 793 }
 794
 795 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 796 {
 797         struct dsa_slave_priv *p = netdev_priv(dev);
 798         struct dsa_switch *ds = p->parent;
 799         int ret;
 800
 801         if (!ds->drv->set_eee)
 802                 return -EOPNOTSUPP;
 803
 804         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 805         if (ret)
 806                 return ret;
 807
 808         if (p->phy)
 809                 ret = phy_ethtool_set_eee(p->phy, e);
 810
 811         return ret;
 812 }
 813
 814 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 815 {
 816         struct dsa_slave_priv *p = netdev_priv(dev);
 817         struct dsa_switch *ds = p->parent;
 818         int ret;
 819
 820         if (!ds->drv->get_eee)
 821                 return -EOPNOTSUPP;
 822
 823         ret = ds->drv->get_eee(ds, p->port, e);
 824         if (ret)
 825                 return ret;
 826
 827         if (p->phy)
 828                 ret = phy_ethtool_get_eee(p->phy, e);
 829
 830         return ret;
 831 }
 832
 833 #ifdef CONFIG_NET_POLL_CONTROLLER
 834 static int dsa_slave_netpoll_setup(struct net_device *dev,
 835                                    struct netpoll_info *ni)
 836 {
 837         struct dsa_slave_priv *p = netdev_priv(dev);
 838         struct dsa_switch *ds = p->parent;
 839         struct net_device *master = ds->dst->master_netdev;
 840         struct netpoll *netpoll;
 841         int err = 0;
 842
 843         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 844         if (!netpoll)
 845                 return -ENOMEM;
 846
 847         err = __netpoll_setup(netpoll, master);
 848         if (err) {
 849                 kfree(netpoll);
 850                 goto out;
 851         }
 852
 853         p->netpoll = netpoll;
 854 out:
 855         return err;
 856 }
 857
 858 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 859 {
 860         struct dsa_slave_priv *p = netdev_priv(dev);
 861         struct netpoll *netpoll = p->netpoll;
 862
 863         if (!netpoll)
 864                 return;
 865
 866         p->netpoll = NULL;
 867
 868         __netpoll_free_async(netpoll);
 869 }
 870
 871 static void dsa_slave_poll_controller(struct net_device *dev)
 872 {
 873 }
 874 #endif
 875
 876 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 877         .get_settings           = dsa_slave_get_settings,
 878         .set_settings           = dsa_slave_set_settings,
 879         .get_drvinfo            = dsa_slave_get_drvinfo,
 880         .get_regs_len           = dsa_slave_get_regs_len,
 881         .get_regs               = dsa_slave_get_regs,
 882         .nway_reset             = dsa_slave_nway_reset,
 883         .get_link               = dsa_slave_get_link,
 884         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 885         .get_eeprom             = dsa_slave_get_eeprom,
 886         .set_eeprom             = dsa_slave_set_eeprom,
 887         .get_strings            = dsa_slave_get_strings,
 888         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 889         .get_sset_count         = dsa_slave_get_sset_count,
 890         .set_wol                = dsa_slave_set_wol,
 891         .get_wol                = dsa_slave_get_wol,
 892         .set_eee                = dsa_slave_set_eee,
 893         .get_eee                = dsa_slave_get_eee,
 894 };
 895
 896 static struct ethtool_ops dsa_cpu_port_ethtool_ops;
 897
 898 static const struct net_device_ops dsa_slave_netdev_ops = {
 899         .ndo_open               = dsa_slave_open,
 900         .ndo_stop               = dsa_slave_close,
 901         .ndo_start_xmit         = dsa_slave_xmit,
 902         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 903         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 904         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 905         .ndo_fdb_add            = switchdev_port_fdb_add,
 906         .ndo_fdb_del            = switchdev_port_fdb_del,
 907         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 908         .ndo_do_ioctl           = dsa_slave_ioctl,
 909         .ndo_get_iflink         = dsa_slave_get_iflink,
 910 #ifdef CONFIG_NET_POLL_CONTROLLER
 911         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 912         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 913         .ndo_poll_controller    = dsa_slave_poll_controller,
 914 #endif
 915         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 916         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 917         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 918 };
 919
 920 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 921         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 922         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 923         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 924         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 925         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 926 };
 927
 928 static struct device_type dsa_type = {
 929         .name   = "dsa",
 930 };
 931
 932 static void dsa_slave_adjust_link(struct net_device *dev)
 933 {
 934         struct dsa_slave_priv *p = netdev_priv(dev);
 935         struct dsa_switch *ds = p->parent;
 936         unsigned int status_changed = 0;
 937
 938         if (p->old_link != p->phy->link) {
 939                 status_changed = 1;
 940                 p->old_link = p->phy->link;
 941         }
 942
 943         if (p->old_duplex != p->phy->duplex) {
 944                 status_changed = 1;
 945                 p->old_duplex = p->phy->duplex;
 946         }
 947
 948         if (p->old_pause != p->phy->pause) {
 949                 status_changed = 1;
 950                 p->old_pause = p->phy->pause;
 951         }
 952
 953         if (ds->drv->adjust_link && status_changed)
 954                 ds->drv->adjust_link(ds, p->port, p->phy);
 955
 956         if (status_changed)
 957                 phy_print_status(p->phy);
 958 }
 959
 960 static int dsa_slave_fixed_link_update(struct net_device *dev,
 961                                        struct fixed_phy_status *status)
 962 {
 963         struct dsa_slave_priv *p;
 964         struct dsa_switch *ds;
 965
 966         if (dev) {
 967                 p = netdev_priv(dev);
 968                 ds = p->parent;
 969                 if (ds->drv->fixed_link_update)
 970                         ds->drv->fixed_link_update(ds, p->port, status);
 971         }
 972
 973         return 0;
 974 }
 975
 976 /* slave device setup *******************************************************/
 977 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 978                                  struct net_device *slave_dev,
 979                                  int addr)
 980 {
 981         struct dsa_switch *ds = p->parent;
 982
 983         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
 984         if (!p->phy) {
 985                 netdev_err(slave_dev, "no phy at %d\n", addr);
 986                 return -ENODEV;
 987         }
 988
 989         /* Use already configured phy mode */
 990         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
 991                 p->phy_interface = p->phy->interface;
 992         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 993                            p->phy_interface);
 994
 995         return 0;
 996 }
 997
 998 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 999                                 struct net_device *slave_dev)
1000 {
1001         struct dsa_switch *ds = p->parent;
1002         struct dsa_chip_data *cd = ds->cd;
1003         struct device_node *phy_dn, *port_dn;
1004         bool phy_is_fixed = false;
1005         u32 phy_flags = 0;
1006         int mode, ret;
1007
1008         port_dn = cd->port_dn[p->port];
1009         mode = of_get_phy_mode(port_dn);
1010         if (mode < 0)
1011                 mode = PHY_INTERFACE_MODE_NA;
1012         p->phy_interface = mode;
1013
1014         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1015         if (of_phy_is_fixed_link(port_dn)) {
1016                 /* In the case of a fixed PHY, the DT node associated
1017                  * to the fixed PHY is the Port DT node
1018                  */
1019                 ret = of_phy_register_fixed_link(port_dn);
1020                 if (ret) {
1021                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1022                         return ret;
1023                 }
1024                 phy_is_fixed = true;
1025                 phy_dn = port_dn;
1026         }
1027
1028         if (ds->drv->get_phy_flags)
1029                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1030
1031         if (phy_dn) {
1032                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1033
1034                 /* If this PHY address is part of phys_mii_mask, which means
1035                  * that we need to divert reads and writes to/from it, then we
1036                  * want to bind this device using the slave MII bus created by
1037                  * DSA to make that happen.
1038                  */
1039                 if (!phy_is_fixed && phy_id >= 0 &&
1040                     (ds->phys_mii_mask & (1 << phy_id))) {
1041                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1042                         if (ret) {
1043                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1044                                 return ret;
1045                         }
1046                 } else {
1047                         p->phy = of_phy_connect(slave_dev, phy_dn,
1048                                                 dsa_slave_adjust_link,
1049                                                 phy_flags,
1050                                                 p->phy_interface);
1051                 }
1052         }
1053
1054         if (p->phy && phy_is_fixed)
1055                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1056
1057         /* We could not connect to a designated PHY, so use the switch internal
1058          * MDIO bus instead
1059          */
1060         if (!p->phy) {
1061                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1062                 if (ret) {
1063                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1064                         return ret;
1065                 }
1066         }
1067
1068         phy_attached_info(p->phy);
1069
1070         return 0;
1071 }
1072
1073 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1074 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1075                                             struct netdev_queue *txq,
1076                                             void *_unused)
1077 {
1078         lockdep_set_class(&txq->_xmit_lock,
1079                           &dsa_slave_netdev_xmit_lock_key);
1080 }
1081
1082 int dsa_slave_suspend(struct net_device *slave_dev)
1083 {
1084         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1085
1086         if (p->phy) {
1087                 phy_stop(p->phy);
1088                 p->old_pause = -1;
1089                 p->old_link = -1;
1090                 p->old_duplex = -1;
1091                 phy_suspend(p->phy);
1092         }
1093
1094         return 0;
1095 }
1096
1097 int dsa_slave_resume(struct net_device *slave_dev)
1098 {
1099         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1100
1101         netif_device_attach(slave_dev);
1102
1103         if (p->phy) {
1104                 phy_resume(p->phy);
1105                 phy_start(p->phy);
1106         }
1107
1108         return 0;
1109 }
1110
1111 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1112                      int port, char *name)
1113 {
1114         struct net_device *master = ds->dst->master_netdev;
1115         struct dsa_switch_tree *dst = ds->dst;
1116         struct net_device *slave_dev;
1117         struct dsa_slave_priv *p;
1118         int ret;
1119
1120         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1121                                  NET_NAME_UNKNOWN, ether_setup);
1122         if (slave_dev == NULL)
1123                 return -ENOMEM;
1124
1125         slave_dev->features = master->vlan_features;
1126         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1127         if (master->ethtool_ops != &dsa_cpu_port_ethtool_ops) {
1128                 memcpy(&dst->master_ethtool_ops, master->ethtool_ops,
1129                        sizeof(struct ethtool_ops));
1130                 memcpy(&dsa_cpu_port_ethtool_ops, &dst->master_ethtool_ops,
1131                        sizeof(struct ethtool_ops));
1132                 dsa_cpu_port_ethtool_ops.get_sset_count =
1133                                         dsa_cpu_port_get_sset_count;
1134                 dsa_cpu_port_ethtool_ops.get_ethtool_stats =
1135                                         dsa_cpu_port_get_ethtool_stats;
1136                 dsa_cpu_port_ethtool_ops.get_strings =
1137                                         dsa_cpu_port_get_strings;
1138                 master->ethtool_ops = &dsa_cpu_port_ethtool_ops;
1139         }
1140         eth_hw_addr_inherit(slave_dev, master);
1141         slave_dev->priv_flags |= IFF_NO_QUEUE;
1142         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1143         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1144         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1145
1146         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1147                                  NULL);
1148
1149         SET_NETDEV_DEV(slave_dev, parent);
1150         slave_dev->dev.of_node = ds->cd->port_dn[port];
1151         slave_dev->vlan_features = master->vlan_features;
1152
1153         p = netdev_priv(slave_dev);
1154         p->parent = ds;
1155         p->port = port;
1156
1157         switch (ds->dst->tag_protocol) {
1158 #ifdef CONFIG_NET_DSA_TAG_DSA
1159         case DSA_TAG_PROTO_DSA:
1160                 p->xmit = dsa_netdev_ops.xmit;
1161                 break;
1162 #endif
1163 #ifdef CONFIG_NET_DSA_TAG_EDSA
1164         case DSA_TAG_PROTO_EDSA:
1165                 p->xmit = edsa_netdev_ops.xmit;
1166                 break;
1167 #endif
1168 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1169         case DSA_TAG_PROTO_TRAILER:
1170                 p->xmit = trailer_netdev_ops.xmit;
1171                 break;
1172 #endif
1173 #ifdef CONFIG_NET_DSA_TAG_BRCM
1174         case DSA_TAG_PROTO_BRCM:
1175                 p->xmit = brcm_netdev_ops.xmit;
1176                 break;
1177 #endif
1178         default:
1179                 p->xmit = dsa_slave_notag_xmit;
1180                 break;
1181         }
1182
1183         p->old_pause = -1;
1184         p->old_link = -1;
1185         p->old_duplex = -1;
1186
1187         ds->ports[port] = slave_dev;
1188         ret = register_netdev(slave_dev);
1189         if (ret) {
1190                 netdev_err(master, "error %d registering interface %s\n",
1191                            ret, slave_dev->name);
1192                 ds->ports[port] = NULL;
1193                 free_netdev(slave_dev);
1194                 return ret;
1195         }
1196
1197         netif_carrier_off(slave_dev);
1198
1199         ret = dsa_slave_phy_setup(p, slave_dev);
1200         if (ret) {
1201                 netdev_err(master, "error %d setting up slave phy\n", ret);
1202                 unregister_netdev(slave_dev);
1203                 free_netdev(slave_dev);
1204                 return ret;
1205         }
1206
1207         return 0;
1208 }
1209
1210 void dsa_slave_destroy(struct net_device *slave_dev)
1211 {
1212         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1213
1214         netif_carrier_off(slave_dev);
1215         if (p->phy)
1216                 phy_disconnect(p->phy);
1217         unregister_netdev(slave_dev);
1218         free_netdev(slave_dev);
1219 }
1220
1221 static bool dsa_slave_dev_check(struct net_device *dev)
1222 {
1223         return dev->netdev_ops == &dsa_slave_netdev_ops;
1224 }
1225
1226 static int dsa_slave_port_upper_event(struct net_device *dev,
1227                                       unsigned long event, void *ptr)
1228 {
1229         struct netdev_notifier_changeupper_info *info = ptr;
1230         struct net_device *upper = info->upper_dev;
1231         int err = 0;
1232
1233         switch (event) {
1234         case NETDEV_CHANGEUPPER:
1235                 if (netif_is_bridge_master(upper)) {
1236                         if (info->linking)
1237                                 err = dsa_slave_bridge_port_join(dev, upper);
1238                         else
1239                                 dsa_slave_bridge_port_leave(dev);
1240                 }
1241
1242                 break;
1243         }
1244
1245         return notifier_from_errno(err);
1246 }
1247
1248 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1249                                 void *ptr)
1250 {
1251         switch (event) {
1252         case NETDEV_CHANGEUPPER:
1253                 return dsa_slave_port_upper_event(dev, event, ptr);
1254         }
1255
1256         return NOTIFY_DONE;
1257 }
1258
1259 int dsa_slave_netdevice_event(struct notifier_block *unused,
1260                               unsigned long event, void *ptr)
1261 {
1262         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1263
1264         if (dsa_slave_dev_check(dev))
1265                 return dsa_slave_port_event(dev, event, ptr);
1266
1267         return NOTIFY_DONE;
1268 }