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", ds->index);
  53         ds->slave_mii_bus->parent = ds->dev;
  54         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  55 }
  56
  57
  58 /* slave device handling ****************************************************/
  59 static int dsa_slave_get_iflink(const struct net_device *dev)
  60 {
  61         struct dsa_slave_priv *p = netdev_priv(dev);
  62
  63         return p->parent->dst->master_netdev->ifindex;
  64 }
  65
  66 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  67 {
  68         return !!p->bridge_dev;
  69 }
  70
  71 static int dsa_slave_open(struct net_device *dev)
  72 {
  73         struct dsa_slave_priv *p = netdev_priv(dev);
  74         struct net_device *master = p->parent->dst->master_netdev;
  75         struct dsa_switch *ds = p->parent;
  76         u8 stp_state = dsa_port_is_bridged(p) ?
  77                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  78         int err;
  79
  80         if (!(master->flags & IFF_UP))
  81                 return -ENETDOWN;
  82
  83         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  84                 err = dev_uc_add(master, dev->dev_addr);
  85                 if (err < 0)
  86                         goto out;
  87         }
  88
  89         if (dev->flags & IFF_ALLMULTI) {
  90                 err = dev_set_allmulti(master, 1);
  91                 if (err < 0)
  92                         goto del_unicast;
  93         }
  94         if (dev->flags & IFF_PROMISC) {
  95                 err = dev_set_promiscuity(master, 1);
  96                 if (err < 0)
  97                         goto clear_allmulti;
  98         }
  99
 100         if (ds->drv->port_enable) {
 101                 err = ds->drv->port_enable(ds, p->port, p->phy);
 102                 if (err)
 103                         goto clear_promisc;
 104         }
 105
 106         if (ds->drv->port_stp_state_set)
 107                 ds->drv->port_stp_state_set(ds, p->port, stp_state);
 108
 109         if (p->phy)
 110                 phy_start(p->phy);
 111
 112         return 0;
 113
 114 clear_promisc:
 115         if (dev->flags & IFF_PROMISC)
 116                 dev_set_promiscuity(master, -1);
 117 clear_allmulti:
 118         if (dev->flags & IFF_ALLMULTI)
 119                 dev_set_allmulti(master, -1);
 120 del_unicast:
 121         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 122                 dev_uc_del(master, dev->dev_addr);
 123 out:
 124         return err;
 125 }
 126
 127 static int dsa_slave_close(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->dst->master_netdev;
 131         struct dsa_switch *ds = p->parent;
 132
 133         if (p->phy)
 134                 phy_stop(p->phy);
 135
 136         dev_mc_unsync(master, dev);
 137         dev_uc_unsync(master, dev);
 138         if (dev->flags & IFF_ALLMULTI)
 139                 dev_set_allmulti(master, -1);
 140         if (dev->flags & IFF_PROMISC)
 141                 dev_set_promiscuity(master, -1);
 142
 143         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 144                 dev_uc_del(master, dev->dev_addr);
 145
 146         if (ds->drv->port_disable)
 147                 ds->drv->port_disable(ds, p->port, p->phy);
 148
 149         if (ds->drv->port_stp_state_set)
 150                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_DISABLED);
 151
 152         return 0;
 153 }
 154
 155 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 156 {
 157         struct dsa_slave_priv *p = netdev_priv(dev);
 158         struct net_device *master = p->parent->dst->master_netdev;
 159
 160         if (change & IFF_ALLMULTI)
 161                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 162         if (change & IFF_PROMISC)
 163                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 164 }
 165
 166 static void dsa_slave_set_rx_mode(struct net_device *dev)
 167 {
 168         struct dsa_slave_priv *p = netdev_priv(dev);
 169         struct net_device *master = p->parent->dst->master_netdev;
 170
 171         dev_mc_sync(master, dev);
 172         dev_uc_sync(master, dev);
 173 }
 174
 175 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 176 {
 177         struct dsa_slave_priv *p = netdev_priv(dev);
 178         struct net_device *master = p->parent->dst->master_netdev;
 179         struct sockaddr *addr = a;
 180         int err;
 181
 182         if (!is_valid_ether_addr(addr->sa_data))
 183                 return -EADDRNOTAVAIL;
 184
 185         if (!(dev->flags & IFF_UP))
 186                 goto out;
 187
 188         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 189                 err = dev_uc_add(master, addr->sa_data);
 190                 if (err < 0)
 191                         return err;
 192         }
 193
 194         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 195                 dev_uc_del(master, dev->dev_addr);
 196
 197 out:
 198         ether_addr_copy(dev->dev_addr, addr->sa_data);
 199
 200         return 0;
 201 }
 202
 203 static int dsa_slave_port_vlan_add(struct net_device *dev,
 204                                    const struct switchdev_obj_port_vlan *vlan,
 205                                    struct switchdev_trans *trans)
 206 {
 207         struct dsa_slave_priv *p = netdev_priv(dev);
 208         struct dsa_switch *ds = p->parent;
 209
 210         if (switchdev_trans_ph_prepare(trans)) {
 211                 if (!ds->drv->port_vlan_prepare || !ds->drv->port_vlan_add)
 212                         return -EOPNOTSUPP;
 213
 214                 return ds->drv->port_vlan_prepare(ds, p->port, vlan, trans);
 215         }
 216
 217         ds->drv->port_vlan_add(ds, p->port, vlan, trans);
 218
 219         return 0;
 220 }
 221
 222 static int dsa_slave_port_vlan_del(struct net_device *dev,
 223                                    const struct switchdev_obj_port_vlan *vlan)
 224 {
 225         struct dsa_slave_priv *p = netdev_priv(dev);
 226         struct dsa_switch *ds = p->parent;
 227
 228         if (!ds->drv->port_vlan_del)
 229                 return -EOPNOTSUPP;
 230
 231         return ds->drv->port_vlan_del(ds, p->port, vlan);
 232 }
 233
 234 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 235                                     struct switchdev_obj_port_vlan *vlan,
 236                                     switchdev_obj_dump_cb_t *cb)
 237 {
 238         struct dsa_slave_priv *p = netdev_priv(dev);
 239         struct dsa_switch *ds = p->parent;
 240
 241         if (ds->drv->port_vlan_dump)
 242                 return ds->drv->port_vlan_dump(ds, p->port, vlan, cb);
 243
 244         return -EOPNOTSUPP;
 245 }
 246
 247 static int dsa_slave_port_fdb_add(struct net_device *dev,
 248                                   const struct switchdev_obj_port_fdb *fdb,
 249                                   struct switchdev_trans *trans)
 250 {
 251         struct dsa_slave_priv *p = netdev_priv(dev);
 252         struct dsa_switch *ds = p->parent;
 253
 254         if (switchdev_trans_ph_prepare(trans)) {
 255                 if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 256                         return -EOPNOTSUPP;
 257
 258                 return ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 259         }
 260
 261         ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 262
 263         return 0;
 264 }
 265
 266 static int dsa_slave_port_fdb_del(struct net_device *dev,
 267                                   const struct switchdev_obj_port_fdb *fdb)
 268 {
 269         struct dsa_slave_priv *p = netdev_priv(dev);
 270         struct dsa_switch *ds = p->parent;
 271         int ret = -EOPNOTSUPP;
 272
 273         if (ds->drv->port_fdb_del)
 274                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 275
 276         return ret;
 277 }
 278
 279 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 280                                    struct switchdev_obj_port_fdb *fdb,
 281                                    switchdev_obj_dump_cb_t *cb)
 282 {
 283         struct dsa_slave_priv *p = netdev_priv(dev);
 284         struct dsa_switch *ds = p->parent;
 285
 286         if (ds->drv->port_fdb_dump)
 287                 return ds->drv->port_fdb_dump(ds, p->port, fdb, cb);
 288
 289         return -EOPNOTSUPP;
 290 }
 291
 292 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 293 {
 294         struct dsa_slave_priv *p = netdev_priv(dev);
 295
 296         if (p->phy != NULL)
 297                 return phy_mii_ioctl(p->phy, ifr, cmd);
 298
 299         return -EOPNOTSUPP;
 300 }
 301
 302 static int dsa_slave_stp_state_set(struct net_device *dev,
 303                                    const struct switchdev_attr *attr,
 304                                    struct switchdev_trans *trans)
 305 {
 306         struct dsa_slave_priv *p = netdev_priv(dev);
 307         struct dsa_switch *ds = p->parent;
 308
 309         if (switchdev_trans_ph_prepare(trans))
 310                 return ds->drv->port_stp_state_set ? 0 : -EOPNOTSUPP;
 311
 312         ds->drv->port_stp_state_set(ds, p->port, attr->u.stp_state);
 313
 314         return 0;
 315 }
 316
 317 static int dsa_slave_vlan_filtering(struct net_device *dev,
 318                                     const struct switchdev_attr *attr,
 319                                     struct switchdev_trans *trans)
 320 {
 321         struct dsa_slave_priv *p = netdev_priv(dev);
 322         struct dsa_switch *ds = p->parent;
 323
 324         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 325         if (switchdev_trans_ph_prepare(trans))
 326                 return 0;
 327
 328         if (ds->drv->port_vlan_filtering)
 329                 return ds->drv->port_vlan_filtering(ds, p->port,
 330                                                     attr->u.vlan_filtering);
 331
 332         return 0;
 333 }
 334
 335 static int dsa_slave_port_attr_set(struct net_device *dev,
 336                                    const struct switchdev_attr *attr,
 337                                    struct switchdev_trans *trans)
 338 {
 339         int ret;
 340
 341         switch (attr->id) {
 342         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 343                 ret = dsa_slave_stp_state_set(dev, attr, trans);
 344                 break;
 345         case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 346                 ret = dsa_slave_vlan_filtering(dev, attr, trans);
 347                 break;
 348         default:
 349                 ret = -EOPNOTSUPP;
 350                 break;
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int dsa_slave_port_obj_add(struct net_device *dev,
 357                                   const struct switchdev_obj *obj,
 358                                   struct switchdev_trans *trans)
 359 {
 360         int err;
 361
 362         /* For the prepare phase, ensure the full set of changes is feasable in
 363          * one go in order to signal a failure properly. If an operation is not
 364          * supported, return -EOPNOTSUPP.
 365          */
 366
 367         switch (obj->id) {
 368         case SWITCHDEV_OBJ_ID_PORT_FDB:
 369                 err = dsa_slave_port_fdb_add(dev,
 370                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 371                                              trans);
 372                 break;
 373         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 374                 err = dsa_slave_port_vlan_add(dev,
 375                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 376                                               trans);
 377                 break;
 378         default:
 379                 err = -EOPNOTSUPP;
 380                 break;
 381         }
 382
 383         return err;
 384 }
 385
 386 static int dsa_slave_port_obj_del(struct net_device *dev,
 387                                   const struct switchdev_obj *obj)
 388 {
 389         int err;
 390
 391         switch (obj->id) {
 392         case SWITCHDEV_OBJ_ID_PORT_FDB:
 393                 err = dsa_slave_port_fdb_del(dev,
 394                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 395                 break;
 396         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 397                 err = dsa_slave_port_vlan_del(dev,
 398                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 399                 break;
 400         default:
 401                 err = -EOPNOTSUPP;
 402                 break;
 403         }
 404
 405         return err;
 406 }
 407
 408 static int dsa_slave_port_obj_dump(struct net_device *dev,
 409                                    struct switchdev_obj *obj,
 410                                    switchdev_obj_dump_cb_t *cb)
 411 {
 412         int err;
 413
 414         switch (obj->id) {
 415         case SWITCHDEV_OBJ_ID_PORT_FDB:
 416                 err = dsa_slave_port_fdb_dump(dev,
 417                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 418                                               cb);
 419                 break;
 420         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 421                 err = dsa_slave_port_vlan_dump(dev,
 422                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 423                                                cb);
 424                 break;
 425         default:
 426                 err = -EOPNOTSUPP;
 427                 break;
 428         }
 429
 430         return err;
 431 }
 432
 433 static int dsa_slave_bridge_port_join(struct net_device *dev,
 434                                       struct net_device *br)
 435 {
 436         struct dsa_slave_priv *p = netdev_priv(dev);
 437         struct dsa_switch *ds = p->parent;
 438         int ret = -EOPNOTSUPP;
 439
 440         p->bridge_dev = br;
 441
 442         if (ds->drv->port_bridge_join)
 443                 ret = ds->drv->port_bridge_join(ds, p->port, br);
 444
 445         return ret == -EOPNOTSUPP ? 0 : ret;
 446 }
 447
 448 static void dsa_slave_bridge_port_leave(struct net_device *dev)
 449 {
 450         struct dsa_slave_priv *p = netdev_priv(dev);
 451         struct dsa_switch *ds = p->parent;
 452
 453
 454         if (ds->drv->port_bridge_leave)
 455                 ds->drv->port_bridge_leave(ds, p->port);
 456
 457         p->bridge_dev = NULL;
 458
 459         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 460          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 461          */
 462         if (ds->drv->port_stp_state_set)
 463                 ds->drv->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
 464 }
 465
 466 static int dsa_slave_port_attr_get(struct net_device *dev,
 467                                    struct switchdev_attr *attr)
 468 {
 469         struct dsa_slave_priv *p = netdev_priv(dev);
 470         struct dsa_switch *ds = p->parent;
 471
 472         switch (attr->id) {
 473         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 474                 attr->u.ppid.id_len = sizeof(ds->index);
 475                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 476                 break;
 477         default:
 478                 return -EOPNOTSUPP;
 479         }
 480
 481         return 0;
 482 }
 483
 484 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 485                                                struct sk_buff *skb)
 486 {
 487 #ifdef CONFIG_NET_POLL_CONTROLLER
 488         if (p->netpoll)
 489                 netpoll_send_skb(p->netpoll, skb);
 490 #else
 491         BUG();
 492 #endif
 493         return NETDEV_TX_OK;
 494 }
 495
 496 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 497 {
 498         struct dsa_slave_priv *p = netdev_priv(dev);
 499         struct sk_buff *nskb;
 500
 501         dev->stats.tx_packets++;
 502         dev->stats.tx_bytes += skb->len;
 503
 504         /* Transmit function may have to reallocate the original SKB */
 505         nskb = p->xmit(skb, dev);
 506         if (!nskb)
 507                 return NETDEV_TX_OK;
 508
 509         /* SKB for netpoll still need to be mangled with the protocol-specific
 510          * tag to be successfully transmitted
 511          */
 512         if (unlikely(netpoll_tx_running(dev)))
 513                 return dsa_netpoll_send_skb(p, nskb);
 514
 515         /* Queue the SKB for transmission on the parent interface, but
 516          * do not modify its EtherType
 517          */
 518         nskb->dev = p->parent->dst->master_netdev;
 519         dev_queue_xmit(nskb);
 520
 521         return NETDEV_TX_OK;
 522 }
 523
 524 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 525                                             struct net_device *dev)
 526 {
 527         /* Just return the original SKB */
 528         return skb;
 529 }
 530
 531
 532 /* ethtool operations *******************************************************/
 533 static int
 534 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 535 {
 536         struct dsa_slave_priv *p = netdev_priv(dev);
 537         int err;
 538
 539         err = -EOPNOTSUPP;
 540         if (p->phy != NULL) {
 541                 err = phy_read_status(p->phy);
 542                 if (err == 0)
 543                         err = phy_ethtool_gset(p->phy, cmd);
 544         }
 545
 546         return err;
 547 }
 548
 549 static int
 550 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 551 {
 552         struct dsa_slave_priv *p = netdev_priv(dev);
 553
 554         if (p->phy != NULL)
 555                 return phy_ethtool_sset(p->phy, cmd);
 556
 557         return -EOPNOTSUPP;
 558 }
 559
 560 static void dsa_slave_get_drvinfo(struct net_device *dev,
 561                                   struct ethtool_drvinfo *drvinfo)
 562 {
 563         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 564         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 565         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 566         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 567 }
 568
 569 static int dsa_slave_get_regs_len(struct net_device *dev)
 570 {
 571         struct dsa_slave_priv *p = netdev_priv(dev);
 572         struct dsa_switch *ds = p->parent;
 573
 574         if (ds->drv->get_regs_len)
 575                 return ds->drv->get_regs_len(ds, p->port);
 576
 577         return -EOPNOTSUPP;
 578 }
 579
 580 static void
 581 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 582 {
 583         struct dsa_slave_priv *p = netdev_priv(dev);
 584         struct dsa_switch *ds = p->parent;
 585
 586         if (ds->drv->get_regs)
 587                 ds->drv->get_regs(ds, p->port, regs, _p);
 588 }
 589
 590 static int dsa_slave_nway_reset(struct net_device *dev)
 591 {
 592         struct dsa_slave_priv *p = netdev_priv(dev);
 593
 594         if (p->phy != NULL)
 595                 return genphy_restart_aneg(p->phy);
 596
 597         return -EOPNOTSUPP;
 598 }
 599
 600 static u32 dsa_slave_get_link(struct net_device *dev)
 601 {
 602         struct dsa_slave_priv *p = netdev_priv(dev);
 603
 604         if (p->phy != NULL) {
 605                 genphy_update_link(p->phy);
 606                 return p->phy->link;
 607         }
 608
 609         return -EOPNOTSUPP;
 610 }
 611
 612 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 613 {
 614         struct dsa_slave_priv *p = netdev_priv(dev);
 615         struct dsa_switch *ds = p->parent;
 616
 617         if (ds->cd && ds->cd->eeprom_len)
 618                 return ds->cd->eeprom_len;
 619
 620         if (ds->drv->get_eeprom_len)
 621                 return ds->drv->get_eeprom_len(ds);
 622
 623         return 0;
 624 }
 625
 626 static int dsa_slave_get_eeprom(struct net_device *dev,
 627                                 struct ethtool_eeprom *eeprom, u8 *data)
 628 {
 629         struct dsa_slave_priv *p = netdev_priv(dev);
 630         struct dsa_switch *ds = p->parent;
 631
 632         if (ds->drv->get_eeprom)
 633                 return ds->drv->get_eeprom(ds, eeprom, data);
 634
 635         return -EOPNOTSUPP;
 636 }
 637
 638 static int dsa_slave_set_eeprom(struct net_device *dev,
 639                                 struct ethtool_eeprom *eeprom, u8 *data)
 640 {
 641         struct dsa_slave_priv *p = netdev_priv(dev);
 642         struct dsa_switch *ds = p->parent;
 643
 644         if (ds->drv->set_eeprom)
 645                 return ds->drv->set_eeprom(ds, eeprom, data);
 646
 647         return -EOPNOTSUPP;
 648 }
 649
 650 static void dsa_slave_get_strings(struct net_device *dev,
 651                                   uint32_t stringset, uint8_t *data)
 652 {
 653         struct dsa_slave_priv *p = netdev_priv(dev);
 654         struct dsa_switch *ds = p->parent;
 655
 656         if (stringset == ETH_SS_STATS) {
 657                 int len = ETH_GSTRING_LEN;
 658
 659                 strncpy(data, "tx_packets", len);
 660                 strncpy(data + len, "tx_bytes", len);
 661                 strncpy(data + 2 * len, "rx_packets", len);
 662                 strncpy(data + 3 * len, "rx_bytes", len);
 663                 if (ds->drv->get_strings != NULL)
 664                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 665         }
 666 }
 667
 668 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 669                                            struct ethtool_stats *stats,
 670                                            uint64_t *data)
 671 {
 672         struct dsa_switch_tree *dst = dev->dsa_ptr;
 673         struct dsa_switch *ds = dst->ds[0];
 674         s8 cpu_port = dst->cpu_port;
 675         int count = 0;
 676
 677         if (dst->master_ethtool_ops.get_sset_count) {
 678                 count = dst->master_ethtool_ops.get_sset_count(dev,
 679                                                                ETH_SS_STATS);
 680                 dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
 681         }
 682
 683         if (ds->drv->get_ethtool_stats)
 684                 ds->drv->get_ethtool_stats(ds, cpu_port, data + count);
 685 }
 686
 687 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 688 {
 689         struct dsa_switch_tree *dst = dev->dsa_ptr;
 690         struct dsa_switch *ds = dst->ds[0];
 691         int count = 0;
 692
 693         if (dst->master_ethtool_ops.get_sset_count)
 694                 count += dst->master_ethtool_ops.get_sset_count(dev, sset);
 695
 696         if (sset == ETH_SS_STATS && ds->drv->get_sset_count)
 697                 count += ds->drv->get_sset_count(ds);
 698
 699         return count;
 700 }
 701
 702 static void dsa_cpu_port_get_strings(struct net_device *dev,
 703                                      uint32_t stringset, uint8_t *data)
 704 {
 705         struct dsa_switch_tree *dst = dev->dsa_ptr;
 706         struct dsa_switch *ds = dst->ds[0];
 707         s8 cpu_port = dst->cpu_port;
 708         int len = ETH_GSTRING_LEN;
 709         int mcount = 0, count;
 710         unsigned int i;
 711         uint8_t pfx[4];
 712         uint8_t *ndata;
 713
 714         snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
 715         /* We do not want to be NULL-terminated, since this is a prefix */
 716         pfx[sizeof(pfx) - 1] = '_';
 717
 718         if (dst->master_ethtool_ops.get_sset_count) {
 719                 mcount = dst->master_ethtool_ops.get_sset_count(dev,
 720                                                                 ETH_SS_STATS);
 721                 dst->master_ethtool_ops.get_strings(dev, stringset, data);
 722         }
 723
 724         if (stringset == ETH_SS_STATS && ds->drv->get_strings) {
 725                 ndata = data + mcount * len;
 726                 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
 727                  * the output after to prepend our CPU port prefix we
 728                  * constructed earlier
 729                  */
 730                 ds->drv->get_strings(ds, cpu_port, ndata);
 731                 count = ds->drv->get_sset_count(ds);
 732                 for (i = 0; i < count; i++) {
 733                         memmove(ndata + (i * len + sizeof(pfx)),
 734                                 ndata + i * len, len - sizeof(pfx));
 735                         memcpy(ndata + i * len, pfx, sizeof(pfx));
 736                 }
 737         }
 738 }
 739
 740 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 741                                         struct ethtool_stats *stats,
 742                                         uint64_t *data)
 743 {
 744         struct dsa_slave_priv *p = netdev_priv(dev);
 745         struct dsa_switch *ds = p->parent;
 746
 747         data[0] = dev->stats.tx_packets;
 748         data[1] = dev->stats.tx_bytes;
 749         data[2] = dev->stats.rx_packets;
 750         data[3] = dev->stats.rx_bytes;
 751         if (ds->drv->get_ethtool_stats != NULL)
 752                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 753 }
 754
 755 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 756 {
 757         struct dsa_slave_priv *p = netdev_priv(dev);
 758         struct dsa_switch *ds = p->parent;
 759
 760         if (sset == ETH_SS_STATS) {
 761                 int count;
 762
 763                 count = 4;
 764                 if (ds->drv->get_sset_count != NULL)
 765                         count += ds->drv->get_sset_count(ds);
 766
 767                 return count;
 768         }
 769
 770         return -EOPNOTSUPP;
 771 }
 772
 773 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 774 {
 775         struct dsa_slave_priv *p = netdev_priv(dev);
 776         struct dsa_switch *ds = p->parent;
 777
 778         if (ds->drv->get_wol)
 779                 ds->drv->get_wol(ds, p->port, w);
 780 }
 781
 782 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 783 {
 784         struct dsa_slave_priv *p = netdev_priv(dev);
 785         struct dsa_switch *ds = p->parent;
 786         int ret = -EOPNOTSUPP;
 787
 788         if (ds->drv->set_wol)
 789                 ret = ds->drv->set_wol(ds, p->port, w);
 790
 791         return ret;
 792 }
 793
 794 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 795 {
 796         struct dsa_slave_priv *p = netdev_priv(dev);
 797         struct dsa_switch *ds = p->parent;
 798         int ret;
 799
 800         if (!ds->drv->set_eee)
 801                 return -EOPNOTSUPP;
 802
 803         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 804         if (ret)
 805                 return ret;
 806
 807         if (p->phy)
 808                 ret = phy_ethtool_set_eee(p->phy, e);
 809
 810         return ret;
 811 }
 812
 813 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 814 {
 815         struct dsa_slave_priv *p = netdev_priv(dev);
 816         struct dsa_switch *ds = p->parent;
 817         int ret;
 818
 819         if (!ds->drv->get_eee)
 820                 return -EOPNOTSUPP;
 821
 822         ret = ds->drv->get_eee(ds, p->port, e);
 823         if (ret)
 824                 return ret;
 825
 826         if (p->phy)
 827                 ret = phy_ethtool_get_eee(p->phy, e);
 828
 829         return ret;
 830 }
 831
 832 #ifdef CONFIG_NET_POLL_CONTROLLER
 833 static int dsa_slave_netpoll_setup(struct net_device *dev,
 834                                    struct netpoll_info *ni)
 835 {
 836         struct dsa_slave_priv *p = netdev_priv(dev);
 837         struct dsa_switch *ds = p->parent;
 838         struct net_device *master = ds->dst->master_netdev;
 839         struct netpoll *netpoll;
 840         int err = 0;
 841
 842         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 843         if (!netpoll)
 844                 return -ENOMEM;
 845
 846         err = __netpoll_setup(netpoll, master);
 847         if (err) {
 848                 kfree(netpoll);
 849                 goto out;
 850         }
 851
 852         p->netpoll = netpoll;
 853 out:
 854         return err;
 855 }
 856
 857 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 858 {
 859         struct dsa_slave_priv *p = netdev_priv(dev);
 860         struct netpoll *netpoll = p->netpoll;
 861
 862         if (!netpoll)
 863                 return;
 864
 865         p->netpoll = NULL;
 866
 867         __netpoll_free_async(netpoll);
 868 }
 869
 870 static void dsa_slave_poll_controller(struct net_device *dev)
 871 {
 872 }
 873 #endif
 874
 875 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 876         .get_settings           = dsa_slave_get_settings,
 877         .set_settings           = dsa_slave_set_settings,
 878         .get_drvinfo            = dsa_slave_get_drvinfo,
 879         .get_regs_len           = dsa_slave_get_regs_len,
 880         .get_regs               = dsa_slave_get_regs,
 881         .nway_reset             = dsa_slave_nway_reset,
 882         .get_link               = dsa_slave_get_link,
 883         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 884         .get_eeprom             = dsa_slave_get_eeprom,
 885         .set_eeprom             = dsa_slave_set_eeprom,
 886         .get_strings            = dsa_slave_get_strings,
 887         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 888         .get_sset_count         = dsa_slave_get_sset_count,
 889         .set_wol                = dsa_slave_set_wol,
 890         .get_wol                = dsa_slave_get_wol,
 891         .set_eee                = dsa_slave_set_eee,
 892         .get_eee                = dsa_slave_get_eee,
 893 };
 894
 895 static struct ethtool_ops dsa_cpu_port_ethtool_ops;
 896
 897 static const struct net_device_ops dsa_slave_netdev_ops = {
 898         .ndo_open               = dsa_slave_open,
 899         .ndo_stop               = dsa_slave_close,
 900         .ndo_start_xmit         = dsa_slave_xmit,
 901         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 902         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 903         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 904         .ndo_fdb_add            = switchdev_port_fdb_add,
 905         .ndo_fdb_del            = switchdev_port_fdb_del,
 906         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 907         .ndo_do_ioctl           = dsa_slave_ioctl,
 908         .ndo_get_iflink         = dsa_slave_get_iflink,
 909 #ifdef CONFIG_NET_POLL_CONTROLLER
 910         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 911         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 912         .ndo_poll_controller    = dsa_slave_poll_controller,
 913 #endif
 914         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 915         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 916         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 917 };
 918
 919 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 920         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 921         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 922         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 923         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 924         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 925 };
 926
 927 static struct device_type dsa_type = {
 928         .name   = "dsa",
 929 };
 930
 931 static void dsa_slave_adjust_link(struct net_device *dev)
 932 {
 933         struct dsa_slave_priv *p = netdev_priv(dev);
 934         struct dsa_switch *ds = p->parent;
 935         unsigned int status_changed = 0;
 936
 937         if (p->old_link != p->phy->link) {
 938                 status_changed = 1;
 939                 p->old_link = p->phy->link;
 940         }
 941
 942         if (p->old_duplex != p->phy->duplex) {
 943                 status_changed = 1;
 944                 p->old_duplex = p->phy->duplex;
 945         }
 946
 947         if (p->old_pause != p->phy->pause) {
 948                 status_changed = 1;
 949                 p->old_pause = p->phy->pause;
 950         }
 951
 952         if (ds->drv->adjust_link && status_changed)
 953                 ds->drv->adjust_link(ds, p->port, p->phy);
 954
 955         if (status_changed)
 956                 phy_print_status(p->phy);
 957 }
 958
 959 static int dsa_slave_fixed_link_update(struct net_device *dev,
 960                                        struct fixed_phy_status *status)
 961 {
 962         struct dsa_slave_priv *p;
 963         struct dsa_switch *ds;
 964
 965         if (dev) {
 966                 p = netdev_priv(dev);
 967                 ds = p->parent;
 968                 if (ds->drv->fixed_link_update)
 969                         ds->drv->fixed_link_update(ds, p->port, status);
 970         }
 971
 972         return 0;
 973 }
 974
 975 /* slave device setup *******************************************************/
 976 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 977                                  struct net_device *slave_dev,
 978                                  int addr)
 979 {
 980         struct dsa_switch *ds = p->parent;
 981
 982         p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
 983         if (!p->phy) {
 984                 netdev_err(slave_dev, "no phy at %d\n", addr);
 985                 return -ENODEV;
 986         }
 987
 988         /* Use already configured phy mode */
 989         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
 990                 p->phy_interface = p->phy->interface;
 991         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 992                            p->phy_interface);
 993
 994         return 0;
 995 }
 996
 997 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
 998                                 struct net_device *slave_dev)
 999 {
1000         struct dsa_switch *ds = p->parent;
1001         struct dsa_chip_data *cd = ds->cd;
1002         struct device_node *phy_dn, *port_dn;
1003         bool phy_is_fixed = false;
1004         u32 phy_flags = 0;
1005         int mode, ret;
1006
1007         port_dn = cd->port_dn[p->port];
1008         mode = of_get_phy_mode(port_dn);
1009         if (mode < 0)
1010                 mode = PHY_INTERFACE_MODE_NA;
1011         p->phy_interface = mode;
1012
1013         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1014         if (of_phy_is_fixed_link(port_dn)) {
1015                 /* In the case of a fixed PHY, the DT node associated
1016                  * to the fixed PHY is the Port DT node
1017                  */
1018                 ret = of_phy_register_fixed_link(port_dn);
1019                 if (ret) {
1020                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1021                         return ret;
1022                 }
1023                 phy_is_fixed = true;
1024                 phy_dn = port_dn;
1025         }
1026
1027         if (ds->drv->get_phy_flags)
1028                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1029
1030         if (phy_dn) {
1031                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1032
1033                 /* If this PHY address is part of phys_mii_mask, which means
1034                  * that we need to divert reads and writes to/from it, then we
1035                  * want to bind this device using the slave MII bus created by
1036                  * DSA to make that happen.
1037                  */
1038                 if (!phy_is_fixed && phy_id >= 0 &&
1039                     (ds->phys_mii_mask & (1 << phy_id))) {
1040                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1041                         if (ret) {
1042                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1043                                 return ret;
1044                         }
1045                 } else {
1046                         p->phy = of_phy_connect(slave_dev, phy_dn,
1047                                                 dsa_slave_adjust_link,
1048                                                 phy_flags,
1049                                                 p->phy_interface);
1050                 }
1051         }
1052
1053         if (p->phy && phy_is_fixed)
1054                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1055
1056         /* We could not connect to a designated PHY, so use the switch internal
1057          * MDIO bus instead
1058          */
1059         if (!p->phy) {
1060                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1061                 if (ret) {
1062                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1063                         return ret;
1064                 }
1065         }
1066
1067         phy_attached_info(p->phy);
1068
1069         return 0;
1070 }
1071
1072 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1073 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1074                                             struct netdev_queue *txq,
1075                                             void *_unused)
1076 {
1077         lockdep_set_class(&txq->_xmit_lock,
1078                           &dsa_slave_netdev_xmit_lock_key);
1079 }
1080
1081 int dsa_slave_suspend(struct net_device *slave_dev)
1082 {
1083         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1084
1085         if (p->phy) {
1086                 phy_stop(p->phy);
1087                 p->old_pause = -1;
1088                 p->old_link = -1;
1089                 p->old_duplex = -1;
1090                 phy_suspend(p->phy);
1091         }
1092
1093         return 0;
1094 }
1095
1096 int dsa_slave_resume(struct net_device *slave_dev)
1097 {
1098         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1099
1100         netif_device_attach(slave_dev);
1101
1102         if (p->phy) {
1103                 phy_resume(p->phy);
1104                 phy_start(p->phy);
1105         }
1106
1107         return 0;
1108 }
1109
1110 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1111                      int port, char *name)
1112 {
1113         struct net_device *master = ds->dst->master_netdev;
1114         struct dsa_switch_tree *dst = ds->dst;
1115         struct net_device *slave_dev;
1116         struct dsa_slave_priv *p;
1117         int ret;
1118
1119         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1120                                  NET_NAME_UNKNOWN, ether_setup);
1121         if (slave_dev == NULL)
1122                 return -ENOMEM;
1123
1124         slave_dev->features = master->vlan_features;
1125         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1126         if (master->ethtool_ops != &dsa_cpu_port_ethtool_ops) {
1127                 memcpy(&dst->master_ethtool_ops, master->ethtool_ops,
1128                        sizeof(struct ethtool_ops));
1129                 memcpy(&dsa_cpu_port_ethtool_ops, &dst->master_ethtool_ops,
1130                        sizeof(struct ethtool_ops));
1131                 dsa_cpu_port_ethtool_ops.get_sset_count =
1132                                         dsa_cpu_port_get_sset_count;
1133                 dsa_cpu_port_ethtool_ops.get_ethtool_stats =
1134                                         dsa_cpu_port_get_ethtool_stats;
1135                 dsa_cpu_port_ethtool_ops.get_strings =
1136                                         dsa_cpu_port_get_strings;
1137                 master->ethtool_ops = &dsa_cpu_port_ethtool_ops;
1138         }
1139         eth_hw_addr_inherit(slave_dev, master);
1140         slave_dev->priv_flags |= IFF_NO_QUEUE;
1141         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1142         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1143         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1144
1145         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1146                                  NULL);
1147
1148         SET_NETDEV_DEV(slave_dev, parent);
1149         slave_dev->dev.of_node = ds->cd->port_dn[port];
1150         slave_dev->vlan_features = master->vlan_features;
1151
1152         p = netdev_priv(slave_dev);
1153         p->parent = ds;
1154         p->port = port;
1155
1156         switch (ds->dst->tag_protocol) {
1157 #ifdef CONFIG_NET_DSA_TAG_DSA
1158         case DSA_TAG_PROTO_DSA:
1159                 p->xmit = dsa_netdev_ops.xmit;
1160                 break;
1161 #endif
1162 #ifdef CONFIG_NET_DSA_TAG_EDSA
1163         case DSA_TAG_PROTO_EDSA:
1164                 p->xmit = edsa_netdev_ops.xmit;
1165                 break;
1166 #endif
1167 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1168         case DSA_TAG_PROTO_TRAILER:
1169                 p->xmit = trailer_netdev_ops.xmit;
1170                 break;
1171 #endif
1172 #ifdef CONFIG_NET_DSA_TAG_BRCM
1173         case DSA_TAG_PROTO_BRCM:
1174                 p->xmit = brcm_netdev_ops.xmit;
1175                 break;
1176 #endif
1177         default:
1178                 p->xmit = dsa_slave_notag_xmit;
1179                 break;
1180         }
1181
1182         p->old_pause = -1;
1183         p->old_link = -1;
1184         p->old_duplex = -1;
1185
1186         ds->ports[port] = slave_dev;
1187         ret = register_netdev(slave_dev);
1188         if (ret) {
1189                 netdev_err(master, "error %d registering interface %s\n",
1190                            ret, slave_dev->name);
1191                 ds->ports[port] = NULL;
1192                 free_netdev(slave_dev);
1193                 return ret;
1194         }
1195
1196         netif_carrier_off(slave_dev);
1197
1198         ret = dsa_slave_phy_setup(p, slave_dev);
1199         if (ret) {
1200                 netdev_err(master, "error %d setting up slave phy\n", ret);
1201                 unregister_netdev(slave_dev);
1202                 free_netdev(slave_dev);
1203                 return ret;
1204         }
1205
1206         return 0;
1207 }
1208
1209 void dsa_slave_destroy(struct net_device *slave_dev)
1210 {
1211         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1212
1213         netif_carrier_off(slave_dev);
1214         if (p->phy)
1215                 phy_disconnect(p->phy);
1216         unregister_netdev(slave_dev);
1217         free_netdev(slave_dev);
1218 }
1219
1220 static bool dsa_slave_dev_check(struct net_device *dev)
1221 {
1222         return dev->netdev_ops == &dsa_slave_netdev_ops;
1223 }
1224
1225 static int dsa_slave_port_upper_event(struct net_device *dev,
1226                                       unsigned long event, void *ptr)
1227 {
1228         struct netdev_notifier_changeupper_info *info = ptr;
1229         struct net_device *upper = info->upper_dev;
1230         int err = 0;
1231
1232         switch (event) {
1233         case NETDEV_CHANGEUPPER:
1234                 if (netif_is_bridge_master(upper)) {
1235                         if (info->linking)
1236                                 err = dsa_slave_bridge_port_join(dev, upper);
1237                         else
1238                                 dsa_slave_bridge_port_leave(dev);
1239                 }
1240
1241                 break;
1242         }
1243
1244         return notifier_from_errno(err);
1245 }
1246
1247 static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
1248                                 void *ptr)
1249 {
1250         switch (event) {
1251         case NETDEV_CHANGEUPPER:
1252                 return dsa_slave_port_upper_event(dev, event, ptr);
1253         }
1254
1255         return NOTIFY_DONE;
1256 }
1257
1258 int dsa_slave_netdevice_event(struct notifier_block *unused,
1259                               unsigned long event, void *ptr)
1260 {
1261         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1262
1263         if (dsa_slave_dev_check(dev))
1264                 return dsa_slave_port_event(dev, event, ptr);
1265
1266         return NOTIFY_DONE;
1267 }