net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/of_net.h>
  17 #include <linux/of_mdio.h>
  18 #include <net/rtnetlink.h>
  19 #include <net/switchdev.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/netpoll.h>
  22 #include "dsa_priv.h"
  23
  24 /* slave mii_bus handling ***************************************************/
  25 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  26 {
  27         struct dsa_switch *ds = bus->priv;
  28
  29         if (ds->phys_mii_mask & (1 << addr))
  30                 return ds->drv->phy_read(ds, addr, reg);
  31
  32         return 0xffff;
  33 }
  34
  35 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  36 {
  37         struct dsa_switch *ds = bus->priv;
  38
  39         if (ds->phys_mii_mask & (1 << addr))
  40                 return ds->drv->phy_write(ds, addr, reg, val);
  41
  42         return 0;
  43 }
  44
  45 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  46 {
  47         ds->slave_mii_bus->priv = (void *)ds;
  48         ds->slave_mii_bus->name = "dsa slave smi";
  49         ds->slave_mii_bus->read = dsa_slave_phy_read;
  50         ds->slave_mii_bus->write = dsa_slave_phy_write;
  51         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  52                         ds->index, ds->pd->sw_addr);
  53         ds->slave_mii_bus->parent = ds->master_dev;
  54         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
  55 }
  56
  57
  58 /* slave device handling ****************************************************/
  59 static int dsa_slave_get_iflink(const struct net_device *dev)
  60 {
  61         struct dsa_slave_priv *p = netdev_priv(dev);
  62
  63         return p->parent->dst->master_netdev->ifindex;
  64 }
  65
  66 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
  67 {
  68         return !!p->bridge_dev;
  69 }
  70
  71 static int dsa_slave_open(struct net_device *dev)
  72 {
  73         struct dsa_slave_priv *p = netdev_priv(dev);
  74         struct net_device *master = p->parent->dst->master_netdev;
  75         struct dsa_switch *ds = p->parent;
  76         u8 stp_state = dsa_port_is_bridged(p) ?
  77                         BR_STATE_BLOCKING : BR_STATE_FORWARDING;
  78         int err;
  79
  80         if (!(master->flags & IFF_UP))
  81                 return -ENETDOWN;
  82
  83         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  84                 err = dev_uc_add(master, dev->dev_addr);
  85                 if (err < 0)
  86                         goto out;
  87         }
  88
  89         if (dev->flags & IFF_ALLMULTI) {
  90                 err = dev_set_allmulti(master, 1);
  91                 if (err < 0)
  92                         goto del_unicast;
  93         }
  94         if (dev->flags & IFF_PROMISC) {
  95                 err = dev_set_promiscuity(master, 1);
  96                 if (err < 0)
  97                         goto clear_allmulti;
  98         }
  99
 100         if (ds->drv->port_enable) {
 101                 err = ds->drv->port_enable(ds, p->port, p->phy);
 102                 if (err)
 103                         goto clear_promisc;
 104         }
 105
 106         if (ds->drv->port_stp_update)
 107                 ds->drv->port_stp_update(ds, p->port, stp_state);
 108
 109         if (p->phy)
 110                 phy_start(p->phy);
 111
 112         return 0;
 113
 114 clear_promisc:
 115         if (dev->flags & IFF_PROMISC)
 116                 dev_set_promiscuity(master, -1);
 117 clear_allmulti:
 118         if (dev->flags & IFF_ALLMULTI)
 119                 dev_set_allmulti(master, -1);
 120 del_unicast:
 121         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 122                 dev_uc_del(master, dev->dev_addr);
 123 out:
 124         return err;
 125 }
 126
 127 static int dsa_slave_close(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->dst->master_netdev;
 131         struct dsa_switch *ds = p->parent;
 132
 133         if (p->phy)
 134                 phy_stop(p->phy);
 135
 136         dev_mc_unsync(master, dev);
 137         dev_uc_unsync(master, dev);
 138         if (dev->flags & IFF_ALLMULTI)
 139                 dev_set_allmulti(master, -1);
 140         if (dev->flags & IFF_PROMISC)
 141                 dev_set_promiscuity(master, -1);
 142
 143         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 144                 dev_uc_del(master, dev->dev_addr);
 145
 146         if (ds->drv->port_disable)
 147                 ds->drv->port_disable(ds, p->port, p->phy);
 148
 149         if (ds->drv->port_stp_update)
 150                 ds->drv->port_stp_update(ds, p->port, BR_STATE_DISABLED);
 151
 152         return 0;
 153 }
 154
 155 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 156 {
 157         struct dsa_slave_priv *p = netdev_priv(dev);
 158         struct net_device *master = p->parent->dst->master_netdev;
 159
 160         if (change & IFF_ALLMULTI)
 161                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 162         if (change & IFF_PROMISC)
 163                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 164 }
 165
 166 static void dsa_slave_set_rx_mode(struct net_device *dev)
 167 {
 168         struct dsa_slave_priv *p = netdev_priv(dev);
 169         struct net_device *master = p->parent->dst->master_netdev;
 170
 171         dev_mc_sync(master, dev);
 172         dev_uc_sync(master, dev);
 173 }
 174
 175 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 176 {
 177         struct dsa_slave_priv *p = netdev_priv(dev);
 178         struct net_device *master = p->parent->dst->master_netdev;
 179         struct sockaddr *addr = a;
 180         int err;
 181
 182         if (!is_valid_ether_addr(addr->sa_data))
 183                 return -EADDRNOTAVAIL;
 184
 185         if (!(dev->flags & IFF_UP))
 186                 goto out;
 187
 188         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 189                 err = dev_uc_add(master, addr->sa_data);
 190                 if (err < 0)
 191                         return err;
 192         }
 193
 194         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 195                 dev_uc_del(master, dev->dev_addr);
 196
 197 out:
 198         ether_addr_copy(dev->dev_addr, addr->sa_data);
 199
 200         return 0;
 201 }
 202
 203 static int dsa_bridge_check_vlan_range(struct dsa_switch *ds,
 204                                        const struct net_device *bridge,
 205                                        u16 vid_begin, u16 vid_end)
 206 {
 207         struct dsa_slave_priv *p;
 208         struct net_device *dev, *vlan_br;
 209         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 210         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 211         u16 vid;
 212         int member, err;
 213
 214         if (!ds->drv->vlan_getnext || !vid_begin)
 215                 return -EOPNOTSUPP;
 216
 217         vid = vid_begin - 1;
 218
 219         do {
 220                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 221                 if (err)
 222                         break;
 223
 224                 if (vid > vid_end)
 225                         break;
 226
 227                 member = find_first_bit(members, DSA_MAX_PORTS);
 228                 if (member == DSA_MAX_PORTS)
 229                         continue;
 230
 231                 dev = ds->ports[member];
 232                 p = netdev_priv(dev);
 233                 vlan_br = p->bridge_dev;
 234                 if (vlan_br == bridge)
 235                         continue;
 236
 237                 netdev_dbg(vlan_br, "hardware VLAN %d already in use\n", vid);
 238                 return -EOPNOTSUPP;
 239         } while (vid < vid_end);
 240
 241         return err == -ENOENT ? 0 : err;
 242 }
 243
 244 static int dsa_slave_port_vlan_add(struct net_device *dev,
 245                                    const struct switchdev_obj_port_vlan *vlan,
 246                                    struct switchdev_trans *trans)
 247 {
 248         struct dsa_slave_priv *p = netdev_priv(dev);
 249         struct dsa_switch *ds = p->parent;
 250         u16 vid;
 251         int err;
 252
 253         if (switchdev_trans_ph_prepare(trans)) {
 254                 if (!ds->drv->port_vlan_add || !ds->drv->port_pvid_set)
 255                         return -EOPNOTSUPP;
 256
 257                 /* If the requested port doesn't belong to the same bridge as
 258                  * the VLAN members, fallback to software VLAN (hopefully).
 259                  */
 260                 err = dsa_bridge_check_vlan_range(ds, p->bridge_dev,
 261                                                   vlan->vid_begin,
 262                                                   vlan->vid_end);
 263                 if (err)
 264                         return err;
 265         } else {
 266                 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 267                         err = ds->drv->port_vlan_add(ds, p->port, vid,
 268                                                      vlan->flags &
 269                                                      BRIDGE_VLAN_INFO_UNTAGGED);
 270                         if (!err && vlan->flags & BRIDGE_VLAN_INFO_PVID)
 271                                 err = ds->drv->port_pvid_set(ds, p->port, vid);
 272                         if (err)
 273                                 return err;
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int dsa_slave_port_vlan_del(struct net_device *dev,
 281                                    const struct switchdev_obj_port_vlan *vlan)
 282 {
 283         struct dsa_slave_priv *p = netdev_priv(dev);
 284         struct dsa_switch *ds = p->parent;
 285         u16 vid;
 286         int err;
 287
 288         if (!ds->drv->port_vlan_del)
 289                 return -EOPNOTSUPP;
 290
 291         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 292                 err = ds->drv->port_vlan_del(ds, p->port, vid);
 293                 if (err)
 294                         return err;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 301                                     struct switchdev_obj_port_vlan *vlan,
 302                                     switchdev_obj_dump_cb_t *cb)
 303 {
 304         struct dsa_slave_priv *p = netdev_priv(dev);
 305         struct dsa_switch *ds = p->parent;
 306         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 307         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 308         u16 pvid, vid = 0;
 309         int err;
 310
 311         if (!ds->drv->vlan_getnext || !ds->drv->port_pvid_get)
 312                 return -EOPNOTSUPP;
 313
 314         err = ds->drv->port_pvid_get(ds, p->port, &pvid);
 315         if (err)
 316                 return err;
 317
 318         for (;;) {
 319                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 320                 if (err)
 321                         break;
 322
 323                 if (!test_bit(p->port, members))
 324                         continue;
 325
 326                 memset(vlan, 0, sizeof(*vlan));
 327                 vlan->vid_begin = vlan->vid_end = vid;
 328
 329                 if (vid == pvid)
 330                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 331
 332                 if (test_bit(p->port, untagged))
 333                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 334
 335                 err = cb(&vlan->obj);
 336                 if (err)
 337                         break;
 338         }
 339
 340         return err == -ENOENT ? 0 : err;
 341 }
 342
 343 static int dsa_slave_port_fdb_add(struct net_device *dev,
 344                                   const struct switchdev_obj_port_fdb *fdb,
 345                                   struct switchdev_trans *trans)
 346 {
 347         struct dsa_slave_priv *p = netdev_priv(dev);
 348         struct dsa_switch *ds = p->parent;
 349         int ret;
 350
 351         if (!ds->drv->port_fdb_prepare || !ds->drv->port_fdb_add)
 352                 return -EOPNOTSUPP;
 353
 354         if (switchdev_trans_ph_prepare(trans))
 355                 ret = ds->drv->port_fdb_prepare(ds, p->port, fdb, trans);
 356         else
 357                 ret = ds->drv->port_fdb_add(ds, p->port, fdb, trans);
 358
 359         return ret;
 360 }
 361
 362 static int dsa_slave_port_fdb_del(struct net_device *dev,
 363                                   const struct switchdev_obj_port_fdb *fdb)
 364 {
 365         struct dsa_slave_priv *p = netdev_priv(dev);
 366         struct dsa_switch *ds = p->parent;
 367         int ret = -EOPNOTSUPP;
 368
 369         if (ds->drv->port_fdb_del)
 370                 ret = ds->drv->port_fdb_del(ds, p->port, fdb);
 371
 372         return ret;
 373 }
 374
 375 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 376                                    struct switchdev_obj_port_fdb *fdb,
 377                                    switchdev_obj_dump_cb_t *cb)
 378 {
 379         struct dsa_slave_priv *p = netdev_priv(dev);
 380         struct dsa_switch *ds = p->parent;
 381         unsigned char addr[ETH_ALEN] = { 0 };
 382         u16 vid = 0;
 383         int ret;
 384
 385         if (!ds->drv->port_fdb_getnext)
 386                 return -EOPNOTSUPP;
 387
 388         for (;;) {
 389                 bool is_static;
 390
 391                 ret = ds->drv->port_fdb_getnext(ds, p->port, addr, &vid,
 392                                                 &is_static);
 393                 if (ret < 0)
 394                         break;
 395
 396                 ether_addr_copy(fdb->addr, addr);
 397                 fdb->vid = vid;
 398                 fdb->ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
 399
 400                 ret = cb(&fdb->obj);
 401                 if (ret < 0)
 402                         break;
 403         }
 404
 405         return ret == -ENOENT ? 0 : ret;
 406 }
 407
 408 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 409 {
 410         struct dsa_slave_priv *p = netdev_priv(dev);
 411
 412         if (p->phy != NULL)
 413                 return phy_mii_ioctl(p->phy, ifr, cmd);
 414
 415         return -EOPNOTSUPP;
 416 }
 417
 418 /* Return a bitmask of all ports being currently bridged within a given bridge
 419  * device. Note that on leave, the mask will still return the bitmask of ports
 420  * currently bridged, prior to port removal, and this is exactly what we want.
 421  */
 422 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 423                                   struct net_device *bridge)
 424 {
 425         struct dsa_slave_priv *p;
 426         unsigned int port;
 427         u32 mask = 0;
 428
 429         for (port = 0; port < DSA_MAX_PORTS; port++) {
 430                 if (!dsa_is_port_initialized(ds, port))
 431                         continue;
 432
 433                 p = netdev_priv(ds->ports[port]);
 434
 435                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 436                     p->bridge_dev == bridge)
 437                         mask |= 1 << port;
 438         }
 439
 440         return mask;
 441 }
 442
 443 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 444 {
 445         struct dsa_slave_priv *p = netdev_priv(dev);
 446         struct dsa_switch *ds = p->parent;
 447         int ret = -EOPNOTSUPP;
 448
 449         if (ds->drv->port_stp_update)
 450                 ret = ds->drv->port_stp_update(ds, p->port, state);
 451
 452         return ret;
 453 }
 454
 455 static int dsa_slave_port_attr_set(struct net_device *dev,
 456                                    const struct switchdev_attr *attr,
 457                                    struct switchdev_trans *trans)
 458 {
 459         struct dsa_slave_priv *p = netdev_priv(dev);
 460         struct dsa_switch *ds = p->parent;
 461         int ret;
 462
 463         switch (attr->id) {
 464         case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 465                 if (switchdev_trans_ph_prepare(trans))
 466                         ret = ds->drv->port_stp_update ? 0 : -EOPNOTSUPP;
 467                 else
 468                         ret = ds->drv->port_stp_update(ds, p->port,
 469                                                        attr->u.stp_state);
 470                 break;
 471         default:
 472                 ret = -EOPNOTSUPP;
 473                 break;
 474         }
 475
 476         return ret;
 477 }
 478
 479 static int dsa_slave_port_obj_add(struct net_device *dev,
 480                                   const struct switchdev_obj *obj,
 481                                   struct switchdev_trans *trans)
 482 {
 483         int err;
 484
 485         /* For the prepare phase, ensure the full set of changes is feasable in
 486          * one go in order to signal a failure properly. If an operation is not
 487          * supported, return -EOPNOTSUPP.
 488          */
 489
 490         switch (obj->id) {
 491         case SWITCHDEV_OBJ_ID_PORT_FDB:
 492                 err = dsa_slave_port_fdb_add(dev,
 493                                              SWITCHDEV_OBJ_PORT_FDB(obj),
 494                                              trans);
 495                 break;
 496         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 497                 err = dsa_slave_port_vlan_add(dev,
 498                                               SWITCHDEV_OBJ_PORT_VLAN(obj),
 499                                               trans);
 500                 break;
 501         default:
 502                 err = -EOPNOTSUPP;
 503                 break;
 504         }
 505
 506         return err;
 507 }
 508
 509 static int dsa_slave_port_obj_del(struct net_device *dev,
 510                                   const struct switchdev_obj *obj)
 511 {
 512         int err;
 513
 514         switch (obj->id) {
 515         case SWITCHDEV_OBJ_ID_PORT_FDB:
 516                 err = dsa_slave_port_fdb_del(dev,
 517                                              SWITCHDEV_OBJ_PORT_FDB(obj));
 518                 break;
 519         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 520                 err = dsa_slave_port_vlan_del(dev,
 521                                               SWITCHDEV_OBJ_PORT_VLAN(obj));
 522                 break;
 523         default:
 524                 err = -EOPNOTSUPP;
 525                 break;
 526         }
 527
 528         return err;
 529 }
 530
 531 static int dsa_slave_port_obj_dump(struct net_device *dev,
 532                                    struct switchdev_obj *obj,
 533                                    switchdev_obj_dump_cb_t *cb)
 534 {
 535         int err;
 536
 537         switch (obj->id) {
 538         case SWITCHDEV_OBJ_ID_PORT_FDB:
 539                 err = dsa_slave_port_fdb_dump(dev,
 540                                               SWITCHDEV_OBJ_PORT_FDB(obj),
 541                                               cb);
 542                 break;
 543         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 544                 err = dsa_slave_port_vlan_dump(dev,
 545                                                SWITCHDEV_OBJ_PORT_VLAN(obj),
 546                                                cb);
 547                 break;
 548         default:
 549                 err = -EOPNOTSUPP;
 550                 break;
 551         }
 552
 553         return err;
 554 }
 555
 556 static int dsa_slave_bridge_port_join(struct net_device *dev,
 557                                       struct net_device *br)
 558 {
 559         struct dsa_slave_priv *p = netdev_priv(dev);
 560         struct dsa_switch *ds = p->parent;
 561         int ret = -EOPNOTSUPP;
 562
 563         p->bridge_dev = br;
 564
 565         if (ds->drv->port_join_bridge)
 566                 ret = ds->drv->port_join_bridge(ds, p->port,
 567                                                 dsa_slave_br_port_mask(ds, br));
 568
 569         return ret;
 570 }
 571
 572 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 573 {
 574         struct dsa_slave_priv *p = netdev_priv(dev);
 575         struct dsa_switch *ds = p->parent;
 576         int ret = -EOPNOTSUPP;
 577
 578
 579         if (ds->drv->port_leave_bridge)
 580                 ret = ds->drv->port_leave_bridge(ds, p->port,
 581                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 582
 583         p->bridge_dev = NULL;
 584
 585         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 586          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 587          */
 588         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 589
 590         return ret;
 591 }
 592
 593 static int dsa_slave_port_attr_get(struct net_device *dev,
 594                                    struct switchdev_attr *attr)
 595 {
 596         struct dsa_slave_priv *p = netdev_priv(dev);
 597         struct dsa_switch *ds = p->parent;
 598
 599         switch (attr->id) {
 600         case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
 601                 attr->u.ppid.id_len = sizeof(ds->index);
 602                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 603                 break;
 604         default:
 605                 return -EOPNOTSUPP;
 606         }
 607
 608         return 0;
 609 }
 610
 611 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 612                                                struct sk_buff *skb)
 613 {
 614 #ifdef CONFIG_NET_POLL_CONTROLLER
 615         if (p->netpoll)
 616                 netpoll_send_skb(p->netpoll, skb);
 617 #else
 618         BUG();
 619 #endif
 620         return NETDEV_TX_OK;
 621 }
 622
 623 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 624 {
 625         struct dsa_slave_priv *p = netdev_priv(dev);
 626         struct sk_buff *nskb;
 627
 628         dev->stats.tx_packets++;
 629         dev->stats.tx_bytes += skb->len;
 630
 631         /* Transmit function may have to reallocate the original SKB */
 632         nskb = p->xmit(skb, dev);
 633         if (!nskb)
 634                 return NETDEV_TX_OK;
 635
 636         /* SKB for netpoll still need to be mangled with the protocol-specific
 637          * tag to be successfully transmitted
 638          */
 639         if (unlikely(netpoll_tx_running(dev)))
 640                 return dsa_netpoll_send_skb(p, nskb);
 641
 642         /* Queue the SKB for transmission on the parent interface, but
 643          * do not modify its EtherType
 644          */
 645         nskb->dev = p->parent->dst->master_netdev;
 646         dev_queue_xmit(nskb);
 647
 648         return NETDEV_TX_OK;
 649 }
 650
 651 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 652                                             struct net_device *dev)
 653 {
 654         /* Just return the original SKB */
 655         return skb;
 656 }
 657
 658
 659 /* ethtool operations *******************************************************/
 660 static int
 661 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 662 {
 663         struct dsa_slave_priv *p = netdev_priv(dev);
 664         int err;
 665
 666         err = -EOPNOTSUPP;
 667         if (p->phy != NULL) {
 668                 err = phy_read_status(p->phy);
 669                 if (err == 0)
 670                         err = phy_ethtool_gset(p->phy, cmd);
 671         }
 672
 673         return err;
 674 }
 675
 676 static int
 677 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 678 {
 679         struct dsa_slave_priv *p = netdev_priv(dev);
 680
 681         if (p->phy != NULL)
 682                 return phy_ethtool_sset(p->phy, cmd);
 683
 684         return -EOPNOTSUPP;
 685 }
 686
 687 static void dsa_slave_get_drvinfo(struct net_device *dev,
 688                                   struct ethtool_drvinfo *drvinfo)
 689 {
 690         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 691         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 692         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 693         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 694 }
 695
 696 static int dsa_slave_get_regs_len(struct net_device *dev)
 697 {
 698         struct dsa_slave_priv *p = netdev_priv(dev);
 699         struct dsa_switch *ds = p->parent;
 700
 701         if (ds->drv->get_regs_len)
 702                 return ds->drv->get_regs_len(ds, p->port);
 703
 704         return -EOPNOTSUPP;
 705 }
 706
 707 static void
 708 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 709 {
 710         struct dsa_slave_priv *p = netdev_priv(dev);
 711         struct dsa_switch *ds = p->parent;
 712
 713         if (ds->drv->get_regs)
 714                 ds->drv->get_regs(ds, p->port, regs, _p);
 715 }
 716
 717 static int dsa_slave_nway_reset(struct net_device *dev)
 718 {
 719         struct dsa_slave_priv *p = netdev_priv(dev);
 720
 721         if (p->phy != NULL)
 722                 return genphy_restart_aneg(p->phy);
 723
 724         return -EOPNOTSUPP;
 725 }
 726
 727 static u32 dsa_slave_get_link(struct net_device *dev)
 728 {
 729         struct dsa_slave_priv *p = netdev_priv(dev);
 730
 731         if (p->phy != NULL) {
 732                 genphy_update_link(p->phy);
 733                 return p->phy->link;
 734         }
 735
 736         return -EOPNOTSUPP;
 737 }
 738
 739 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 740 {
 741         struct dsa_slave_priv *p = netdev_priv(dev);
 742         struct dsa_switch *ds = p->parent;
 743
 744         if (ds->pd->eeprom_len)
 745                 return ds->pd->eeprom_len;
 746
 747         if (ds->drv->get_eeprom_len)
 748                 return ds->drv->get_eeprom_len(ds);
 749
 750         return 0;
 751 }
 752
 753 static int dsa_slave_get_eeprom(struct net_device *dev,
 754                                 struct ethtool_eeprom *eeprom, u8 *data)
 755 {
 756         struct dsa_slave_priv *p = netdev_priv(dev);
 757         struct dsa_switch *ds = p->parent;
 758
 759         if (ds->drv->get_eeprom)
 760                 return ds->drv->get_eeprom(ds, eeprom, data);
 761
 762         return -EOPNOTSUPP;
 763 }
 764
 765 static int dsa_slave_set_eeprom(struct net_device *dev,
 766                                 struct ethtool_eeprom *eeprom, u8 *data)
 767 {
 768         struct dsa_slave_priv *p = netdev_priv(dev);
 769         struct dsa_switch *ds = p->parent;
 770
 771         if (ds->drv->set_eeprom)
 772                 return ds->drv->set_eeprom(ds, eeprom, data);
 773
 774         return -EOPNOTSUPP;
 775 }
 776
 777 static void dsa_slave_get_strings(struct net_device *dev,
 778                                   uint32_t stringset, uint8_t *data)
 779 {
 780         struct dsa_slave_priv *p = netdev_priv(dev);
 781         struct dsa_switch *ds = p->parent;
 782
 783         if (stringset == ETH_SS_STATS) {
 784                 int len = ETH_GSTRING_LEN;
 785
 786                 strncpy(data, "tx_packets", len);
 787                 strncpy(data + len, "tx_bytes", len);
 788                 strncpy(data + 2 * len, "rx_packets", len);
 789                 strncpy(data + 3 * len, "rx_bytes", len);
 790                 if (ds->drv->get_strings != NULL)
 791                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 792         }
 793 }
 794
 795 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 796                                         struct ethtool_stats *stats,
 797                                         uint64_t *data)
 798 {
 799         struct dsa_slave_priv *p = netdev_priv(dev);
 800         struct dsa_switch *ds = p->parent;
 801
 802         data[0] = p->dev->stats.tx_packets;
 803         data[1] = p->dev->stats.tx_bytes;
 804         data[2] = p->dev->stats.rx_packets;
 805         data[3] = p->dev->stats.rx_bytes;
 806         if (ds->drv->get_ethtool_stats != NULL)
 807                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 808 }
 809
 810 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 811 {
 812         struct dsa_slave_priv *p = netdev_priv(dev);
 813         struct dsa_switch *ds = p->parent;
 814
 815         if (sset == ETH_SS_STATS) {
 816                 int count;
 817
 818                 count = 4;
 819                 if (ds->drv->get_sset_count != NULL)
 820                         count += ds->drv->get_sset_count(ds);
 821
 822                 return count;
 823         }
 824
 825         return -EOPNOTSUPP;
 826 }
 827
 828 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 829 {
 830         struct dsa_slave_priv *p = netdev_priv(dev);
 831         struct dsa_switch *ds = p->parent;
 832
 833         if (ds->drv->get_wol)
 834                 ds->drv->get_wol(ds, p->port, w);
 835 }
 836
 837 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 838 {
 839         struct dsa_slave_priv *p = netdev_priv(dev);
 840         struct dsa_switch *ds = p->parent;
 841         int ret = -EOPNOTSUPP;
 842
 843         if (ds->drv->set_wol)
 844                 ret = ds->drv->set_wol(ds, p->port, w);
 845
 846         return ret;
 847 }
 848
 849 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 850 {
 851         struct dsa_slave_priv *p = netdev_priv(dev);
 852         struct dsa_switch *ds = p->parent;
 853         int ret;
 854
 855         if (!ds->drv->set_eee)
 856                 return -EOPNOTSUPP;
 857
 858         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 859         if (ret)
 860                 return ret;
 861
 862         if (p->phy)
 863                 ret = phy_ethtool_set_eee(p->phy, e);
 864
 865         return ret;
 866 }
 867
 868 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 869 {
 870         struct dsa_slave_priv *p = netdev_priv(dev);
 871         struct dsa_switch *ds = p->parent;
 872         int ret;
 873
 874         if (!ds->drv->get_eee)
 875                 return -EOPNOTSUPP;
 876
 877         ret = ds->drv->get_eee(ds, p->port, e);
 878         if (ret)
 879                 return ret;
 880
 881         if (p->phy)
 882                 ret = phy_ethtool_get_eee(p->phy, e);
 883
 884         return ret;
 885 }
 886
 887 #ifdef CONFIG_NET_POLL_CONTROLLER
 888 static int dsa_slave_netpoll_setup(struct net_device *dev,
 889                                    struct netpoll_info *ni)
 890 {
 891         struct dsa_slave_priv *p = netdev_priv(dev);
 892         struct dsa_switch *ds = p->parent;
 893         struct net_device *master = ds->dst->master_netdev;
 894         struct netpoll *netpoll;
 895         int err = 0;
 896
 897         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 898         if (!netpoll)
 899                 return -ENOMEM;
 900
 901         err = __netpoll_setup(netpoll, master);
 902         if (err) {
 903                 kfree(netpoll);
 904                 goto out;
 905         }
 906
 907         p->netpoll = netpoll;
 908 out:
 909         return err;
 910 }
 911
 912 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 913 {
 914         struct dsa_slave_priv *p = netdev_priv(dev);
 915         struct netpoll *netpoll = p->netpoll;
 916
 917         if (!netpoll)
 918                 return;
 919
 920         p->netpoll = NULL;
 921
 922         __netpoll_free_async(netpoll);
 923 }
 924
 925 static void dsa_slave_poll_controller(struct net_device *dev)
 926 {
 927 }
 928 #endif
 929
 930 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 931         .get_settings           = dsa_slave_get_settings,
 932         .set_settings           = dsa_slave_set_settings,
 933         .get_drvinfo            = dsa_slave_get_drvinfo,
 934         .get_regs_len           = dsa_slave_get_regs_len,
 935         .get_regs               = dsa_slave_get_regs,
 936         .nway_reset             = dsa_slave_nway_reset,
 937         .get_link               = dsa_slave_get_link,
 938         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 939         .get_eeprom             = dsa_slave_get_eeprom,
 940         .set_eeprom             = dsa_slave_set_eeprom,
 941         .get_strings            = dsa_slave_get_strings,
 942         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 943         .get_sset_count         = dsa_slave_get_sset_count,
 944         .set_wol                = dsa_slave_set_wol,
 945         .get_wol                = dsa_slave_get_wol,
 946         .set_eee                = dsa_slave_set_eee,
 947         .get_eee                = dsa_slave_get_eee,
 948 };
 949
 950 static const struct net_device_ops dsa_slave_netdev_ops = {
 951         .ndo_open               = dsa_slave_open,
 952         .ndo_stop               = dsa_slave_close,
 953         .ndo_start_xmit         = dsa_slave_xmit,
 954         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 955         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 956         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 957         .ndo_fdb_add            = switchdev_port_fdb_add,
 958         .ndo_fdb_del            = switchdev_port_fdb_del,
 959         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 960         .ndo_do_ioctl           = dsa_slave_ioctl,
 961         .ndo_get_iflink         = dsa_slave_get_iflink,
 962 #ifdef CONFIG_NET_POLL_CONTROLLER
 963         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 964         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 965         .ndo_poll_controller    = dsa_slave_poll_controller,
 966 #endif
 967         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 968         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 969         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 970 };
 971
 972 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 973         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 974         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 975         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 976         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 977         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 978 };
 979
 980 static struct device_type dsa_type = {
 981         .name   = "dsa",
 982 };
 983
 984 static void dsa_slave_adjust_link(struct net_device *dev)
 985 {
 986         struct dsa_slave_priv *p = netdev_priv(dev);
 987         struct dsa_switch *ds = p->parent;
 988         unsigned int status_changed = 0;
 989
 990         if (p->old_link != p->phy->link) {
 991                 status_changed = 1;
 992                 p->old_link = p->phy->link;
 993         }
 994
 995         if (p->old_duplex != p->phy->duplex) {
 996                 status_changed = 1;
 997                 p->old_duplex = p->phy->duplex;
 998         }
 999
1000         if (p->old_pause != p->phy->pause) {
1001                 status_changed = 1;
1002                 p->old_pause = p->phy->pause;
1003         }
1004
1005         if (ds->drv->adjust_link && status_changed)
1006                 ds->drv->adjust_link(ds, p->port, p->phy);
1007
1008         if (status_changed)
1009                 phy_print_status(p->phy);
1010 }
1011
1012 static int dsa_slave_fixed_link_update(struct net_device *dev,
1013                                        struct fixed_phy_status *status)
1014 {
1015         struct dsa_slave_priv *p = netdev_priv(dev);
1016         struct dsa_switch *ds = p->parent;
1017
1018         if (ds->drv->fixed_link_update)
1019                 ds->drv->fixed_link_update(ds, p->port, status);
1020
1021         return 0;
1022 }
1023
1024 /* slave device setup *******************************************************/
1025 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1026                                  struct net_device *slave_dev,
1027                                  int addr)
1028 {
1029         struct dsa_switch *ds = p->parent;
1030
1031         p->phy = ds->slave_mii_bus->phy_map[addr];
1032         if (!p->phy) {
1033                 netdev_err(slave_dev, "no phy at %d\n", addr);
1034                 return -ENODEV;
1035         }
1036
1037         /* Use already configured phy mode */
1038         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1039                 p->phy_interface = p->phy->interface;
1040         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1041                            p->phy_interface);
1042
1043         return 0;
1044 }
1045
1046 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1047                                 struct net_device *slave_dev)
1048 {
1049         struct dsa_switch *ds = p->parent;
1050         struct dsa_chip_data *cd = ds->pd;
1051         struct device_node *phy_dn, *port_dn;
1052         bool phy_is_fixed = false;
1053         u32 phy_flags = 0;
1054         int mode, ret;
1055
1056         port_dn = cd->port_dn[p->port];
1057         mode = of_get_phy_mode(port_dn);
1058         if (mode < 0)
1059                 mode = PHY_INTERFACE_MODE_NA;
1060         p->phy_interface = mode;
1061
1062         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1063         if (of_phy_is_fixed_link(port_dn)) {
1064                 /* In the case of a fixed PHY, the DT node associated
1065                  * to the fixed PHY is the Port DT node
1066                  */
1067                 ret = of_phy_register_fixed_link(port_dn);
1068                 if (ret) {
1069                         netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1070                         return ret;
1071                 }
1072                 phy_is_fixed = true;
1073                 phy_dn = port_dn;
1074         }
1075
1076         if (ds->drv->get_phy_flags)
1077                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1078
1079         if (phy_dn) {
1080                 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1081
1082                 /* If this PHY address is part of phys_mii_mask, which means
1083                  * that we need to divert reads and writes to/from it, then we
1084                  * want to bind this device using the slave MII bus created by
1085                  * DSA to make that happen.
1086                  */
1087                 if (!phy_is_fixed && phy_id >= 0 &&
1088                     (ds->phys_mii_mask & (1 << phy_id))) {
1089                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1090                         if (ret) {
1091                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1092                                 return ret;
1093                         }
1094                 } else {
1095                         p->phy = of_phy_connect(slave_dev, phy_dn,
1096                                                 dsa_slave_adjust_link,
1097                                                 phy_flags,
1098                                                 p->phy_interface);
1099                 }
1100         }
1101
1102         if (p->phy && phy_is_fixed)
1103                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1104
1105         /* We could not connect to a designated PHY, so use the switch internal
1106          * MDIO bus instead
1107          */
1108         if (!p->phy) {
1109                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1110                 if (ret) {
1111                         netdev_err(slave_dev, "failed to connect to port %d: %d\n", p->port, ret);
1112                         return ret;
1113                 }
1114         } else {
1115                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
1116                             p->phy->addr, p->phy->drv->name);
1117         }
1118
1119         return 0;
1120 }
1121
1122 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1123 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1124                                             struct netdev_queue *txq,
1125                                             void *_unused)
1126 {
1127         lockdep_set_class(&txq->_xmit_lock,
1128                           &dsa_slave_netdev_xmit_lock_key);
1129 }
1130
1131 int dsa_slave_suspend(struct net_device *slave_dev)
1132 {
1133         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1134
1135         if (p->phy) {
1136                 phy_stop(p->phy);
1137                 p->old_pause = -1;
1138                 p->old_link = -1;
1139                 p->old_duplex = -1;
1140                 phy_suspend(p->phy);
1141         }
1142
1143         return 0;
1144 }
1145
1146 int dsa_slave_resume(struct net_device *slave_dev)
1147 {
1148         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1149
1150         netif_device_attach(slave_dev);
1151
1152         if (p->phy) {
1153                 phy_resume(p->phy);
1154                 phy_start(p->phy);
1155         }
1156
1157         return 0;
1158 }
1159
1160 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1161                      int port, char *name)
1162 {
1163         struct net_device *master = ds->dst->master_netdev;
1164         struct net_device *slave_dev;
1165         struct dsa_slave_priv *p;
1166         int ret;
1167
1168         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1169                                  NET_NAME_UNKNOWN, ether_setup);
1170         if (slave_dev == NULL)
1171                 return -ENOMEM;
1172
1173         slave_dev->features = master->vlan_features;
1174         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1175         eth_hw_addr_inherit(slave_dev, master);
1176         slave_dev->priv_flags |= IFF_NO_QUEUE;
1177         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1178         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1179         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1180
1181         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1182                                  NULL);
1183
1184         SET_NETDEV_DEV(slave_dev, parent);
1185         slave_dev->dev.of_node = ds->pd->port_dn[port];
1186         slave_dev->vlan_features = master->vlan_features;
1187
1188         p = netdev_priv(slave_dev);
1189         p->dev = slave_dev;
1190         p->parent = ds;
1191         p->port = port;
1192
1193         switch (ds->dst->tag_protocol) {
1194 #ifdef CONFIG_NET_DSA_TAG_DSA
1195         case DSA_TAG_PROTO_DSA:
1196                 p->xmit = dsa_netdev_ops.xmit;
1197                 break;
1198 #endif
1199 #ifdef CONFIG_NET_DSA_TAG_EDSA
1200         case DSA_TAG_PROTO_EDSA:
1201                 p->xmit = edsa_netdev_ops.xmit;
1202                 break;
1203 #endif
1204 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1205         case DSA_TAG_PROTO_TRAILER:
1206                 p->xmit = trailer_netdev_ops.xmit;
1207                 break;
1208 #endif
1209 #ifdef CONFIG_NET_DSA_TAG_BRCM
1210         case DSA_TAG_PROTO_BRCM:
1211                 p->xmit = brcm_netdev_ops.xmit;
1212                 break;
1213 #endif
1214         default:
1215                 p->xmit = dsa_slave_notag_xmit;
1216                 break;
1217         }
1218
1219         p->old_pause = -1;
1220         p->old_link = -1;
1221         p->old_duplex = -1;
1222
1223         ret = dsa_slave_phy_setup(p, slave_dev);
1224         if (ret) {
1225                 netdev_err(master, "error %d setting up slave phy\n", ret);
1226                 free_netdev(slave_dev);
1227                 return ret;
1228         }
1229
1230         ds->ports[port] = slave_dev;
1231         ret = register_netdev(slave_dev);
1232         if (ret) {
1233                 netdev_err(master, "error %d registering interface %s\n",
1234                            ret, slave_dev->name);
1235                 phy_disconnect(p->phy);
1236                 ds->ports[port] = NULL;
1237                 free_netdev(slave_dev);
1238                 return ret;
1239         }
1240
1241         netif_carrier_off(slave_dev);
1242
1243         return 0;
1244 }
1245
1246 static bool dsa_slave_dev_check(struct net_device *dev)
1247 {
1248         return dev->netdev_ops == &dsa_slave_netdev_ops;
1249 }
1250
1251 static int dsa_slave_master_changed(struct net_device *dev)
1252 {
1253         struct net_device *master = netdev_master_upper_dev_get(dev);
1254         struct dsa_slave_priv *p = netdev_priv(dev);
1255         int err = 0;
1256
1257         if (master && master->rtnl_link_ops &&
1258             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1259                 err = dsa_slave_bridge_port_join(dev, master);
1260         else if (dsa_port_is_bridged(p))
1261                 err = dsa_slave_bridge_port_leave(dev);
1262
1263         return err;
1264 }
1265
1266 int dsa_slave_netdevice_event(struct notifier_block *unused,
1267                               unsigned long event, void *ptr)
1268 {
1269         struct net_device *dev;
1270         int err = 0;
1271
1272         switch (event) {
1273         case NETDEV_CHANGEUPPER:
1274                 dev = netdev_notifier_info_to_dev(ptr);
1275                 if (!dsa_slave_dev_check(dev))
1276                         goto out;
1277
1278                 err = dsa_slave_master_changed(dev);
1279                 if (err && err != -EOPNOTSUPP)
1280                         netdev_warn(dev, "failed to reflect master change\n");
1281
1282                 break;
1283         }
1284
1285 out:
1286         return NOTIFY_DONE;
1287 }