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                                    struct switchdev_obj *obj,
 246                                    struct switchdev_trans *trans)
 247 {
 248         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 249         struct dsa_slave_priv *p = netdev_priv(dev);
 250         struct dsa_switch *ds = p->parent;
 251         u16 vid;
 252         int err;
 253
 254         if (switchdev_trans_ph_prepare(trans)) {
 255                 if (!ds->drv->port_vlan_add || !ds->drv->port_pvid_set)
 256                         return -EOPNOTSUPP;
 257
 258                 /* If the requested port doesn't belong to the same bridge as
 259                  * the VLAN members, fallback to software VLAN (hopefully).
 260                  */
 261                 err = dsa_bridge_check_vlan_range(ds, p->bridge_dev,
 262                                                   vlan->vid_begin,
 263                                                   vlan->vid_end);
 264                 if (err)
 265                         return err;
 266         } else {
 267                 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 268                         err = ds->drv->port_vlan_add(ds, p->port, vid,
 269                                                      vlan->flags &
 270                                                      BRIDGE_VLAN_INFO_UNTAGGED);
 271                         if (!err && vlan->flags & BRIDGE_VLAN_INFO_PVID)
 272                                 err = ds->drv->port_pvid_set(ds, p->port, vid);
 273                         if (err)
 274                                 return err;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int dsa_slave_port_vlan_del(struct net_device *dev,
 282                                    struct switchdev_obj *obj)
 283 {
 284         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 285         struct dsa_slave_priv *p = netdev_priv(dev);
 286         struct dsa_switch *ds = p->parent;
 287         u16 vid;
 288         int err;
 289
 290         if (!ds->drv->port_vlan_del)
 291                 return -EOPNOTSUPP;
 292
 293         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 294                 err = ds->drv->port_vlan_del(ds, p->port, vid);
 295                 if (err)
 296                         return err;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 303                                     struct switchdev_obj *obj)
 304 {
 305         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 306         struct dsa_slave_priv *p = netdev_priv(dev);
 307         struct dsa_switch *ds = p->parent;
 308         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 309         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 310         u16 pvid, vid = 0;
 311         int err;
 312
 313         if (!ds->drv->vlan_getnext || !ds->drv->port_pvid_get)
 314                 return -EOPNOTSUPP;
 315
 316         err = ds->drv->port_pvid_get(ds, p->port, &pvid);
 317         if (err)
 318                 return err;
 319
 320         for (;;) {
 321                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 322                 if (err)
 323                         break;
 324
 325                 if (!test_bit(p->port, members))
 326                         continue;
 327
 328                 memset(vlan, 0, sizeof(*vlan));
 329                 vlan->vid_begin = vlan->vid_end = vid;
 330
 331                 if (vid == pvid)
 332                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 333
 334                 if (test_bit(p->port, untagged))
 335                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 336
 337                 err = obj->cb(dev, obj);
 338                 if (err)
 339                         break;
 340         }
 341
 342         return err == -ENOENT ? 0 : err;
 343 }
 344
 345 static int dsa_slave_port_fdb_add(struct net_device *dev,
 346                                   struct switchdev_obj *obj,
 347                                   struct switchdev_trans *trans)
 348 {
 349         struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 350         struct dsa_slave_priv *p = netdev_priv(dev);
 351         struct dsa_switch *ds = p->parent;
 352         int ret = -EOPNOTSUPP;
 353
 354         if (switchdev_trans_ph_prepare(trans))
 355                 ret = ds->drv->port_fdb_add ? 0 : -EOPNOTSUPP;
 356         else
 357                 ret = ds->drv->port_fdb_add(ds, p->port, fdb->addr, fdb->vid);
 358
 359         return ret;
 360 }
 361
 362 static int dsa_slave_port_fdb_del(struct net_device *dev,
 363                                   struct switchdev_obj *obj)
 364 {
 365         struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 366         struct dsa_slave_priv *p = netdev_priv(dev);
 367         struct dsa_switch *ds = p->parent;
 368         int ret = -EOPNOTSUPP;
 369
 370         if (ds->drv->port_fdb_del)
 371                 ret = ds->drv->port_fdb_del(ds, p->port, fdb->addr, fdb->vid);
 372
 373         return ret;
 374 }
 375
 376 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 377                                    struct switchdev_obj *obj)
 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                 obj->u.fdb.addr = addr;
 397                 obj->u.fdb.vid = vid;
 398                 obj->u.fdb.ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
 399
 400                 ret = obj->cb(dev, 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                                    struct switchdev_attr *attr,
 457                                    struct switchdev_trans *trans)
 458 {
 459         int ret = 0;
 460
 461         switch (attr->id) {
 462         case SWITCHDEV_ATTR_PORT_STP_STATE:
 463                 if (switchdev_trans_ph_commit(trans))
 464                         ret = dsa_slave_stp_update(dev, attr->u.stp_state);
 465                 break;
 466         default:
 467                 ret = -EOPNOTSUPP;
 468                 break;
 469         }
 470
 471         return ret;
 472 }
 473
 474 static int dsa_slave_port_obj_add(struct net_device *dev,
 475                                   struct switchdev_obj *obj,
 476                                   struct switchdev_trans *trans)
 477 {
 478         int err;
 479
 480         /* For the prepare phase, ensure the full set of changes is feasable in
 481          * one go in order to signal a failure properly. If an operation is not
 482          * supported, return -EOPNOTSUPP.
 483          */
 484
 485         switch (obj->id) {
 486         case SWITCHDEV_OBJ_PORT_FDB:
 487                 err = dsa_slave_port_fdb_add(dev, obj, trans);
 488                 break;
 489         case SWITCHDEV_OBJ_PORT_VLAN:
 490                 err = dsa_slave_port_vlan_add(dev, obj, trans);
 491                 break;
 492         default:
 493                 err = -EOPNOTSUPP;
 494                 break;
 495         }
 496
 497         return err;
 498 }
 499
 500 static int dsa_slave_port_obj_del(struct net_device *dev,
 501                                   struct switchdev_obj *obj)
 502 {
 503         int err;
 504
 505         switch (obj->id) {
 506         case SWITCHDEV_OBJ_PORT_FDB:
 507                 err = dsa_slave_port_fdb_del(dev, obj);
 508                 break;
 509         case SWITCHDEV_OBJ_PORT_VLAN:
 510                 err = dsa_slave_port_vlan_del(dev, obj);
 511                 break;
 512         default:
 513                 err = -EOPNOTSUPP;
 514                 break;
 515         }
 516
 517         return err;
 518 }
 519
 520 static int dsa_slave_port_obj_dump(struct net_device *dev,
 521                                    struct switchdev_obj *obj)
 522 {
 523         int err;
 524
 525         switch (obj->id) {
 526         case SWITCHDEV_OBJ_PORT_FDB:
 527                 err = dsa_slave_port_fdb_dump(dev, obj);
 528                 break;
 529         case SWITCHDEV_OBJ_PORT_VLAN:
 530                 err = dsa_slave_port_vlan_dump(dev, obj);
 531                 break;
 532         default:
 533                 err = -EOPNOTSUPP;
 534                 break;
 535         }
 536
 537         return err;
 538 }
 539
 540 static int dsa_slave_bridge_port_join(struct net_device *dev,
 541                                       struct net_device *br)
 542 {
 543         struct dsa_slave_priv *p = netdev_priv(dev);
 544         struct dsa_switch *ds = p->parent;
 545         int ret = -EOPNOTSUPP;
 546
 547         p->bridge_dev = br;
 548
 549         if (ds->drv->port_join_bridge)
 550                 ret = ds->drv->port_join_bridge(ds, p->port,
 551                                                 dsa_slave_br_port_mask(ds, br));
 552
 553         return ret;
 554 }
 555
 556 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 557 {
 558         struct dsa_slave_priv *p = netdev_priv(dev);
 559         struct dsa_switch *ds = p->parent;
 560         int ret = -EOPNOTSUPP;
 561
 562
 563         if (ds->drv->port_leave_bridge)
 564                 ret = ds->drv->port_leave_bridge(ds, p->port,
 565                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 566
 567         p->bridge_dev = NULL;
 568
 569         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 570          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 571          */
 572         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 573
 574         return ret;
 575 }
 576
 577 static int dsa_slave_port_attr_get(struct net_device *dev,
 578                                    struct switchdev_attr *attr)
 579 {
 580         struct dsa_slave_priv *p = netdev_priv(dev);
 581         struct dsa_switch *ds = p->parent;
 582
 583         switch (attr->id) {
 584         case SWITCHDEV_ATTR_PORT_PARENT_ID:
 585                 attr->u.ppid.id_len = sizeof(ds->index);
 586                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 587                 break;
 588         default:
 589                 return -EOPNOTSUPP;
 590         }
 591
 592         return 0;
 593 }
 594
 595 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 596                                                struct sk_buff *skb)
 597 {
 598 #ifdef CONFIG_NET_POLL_CONTROLLER
 599         if (p->netpoll)
 600                 netpoll_send_skb(p->netpoll, skb);
 601 #else
 602         BUG();
 603 #endif
 604         return NETDEV_TX_OK;
 605 }
 606
 607 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 608 {
 609         struct dsa_slave_priv *p = netdev_priv(dev);
 610         struct sk_buff *nskb;
 611
 612         dev->stats.tx_packets++;
 613         dev->stats.tx_bytes += skb->len;
 614
 615         /* Transmit function may have to reallocate the original SKB */
 616         nskb = p->xmit(skb, dev);
 617         if (!nskb)
 618                 return NETDEV_TX_OK;
 619
 620         /* SKB for netpoll still need to be mangled with the protocol-specific
 621          * tag to be successfully transmitted
 622          */
 623         if (unlikely(netpoll_tx_running(dev)))
 624                 return dsa_netpoll_send_skb(p, nskb);
 625
 626         /* Queue the SKB for transmission on the parent interface, but
 627          * do not modify its EtherType
 628          */
 629         nskb->dev = p->parent->dst->master_netdev;
 630         dev_queue_xmit(nskb);
 631
 632         return NETDEV_TX_OK;
 633 }
 634
 635 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 636                                             struct net_device *dev)
 637 {
 638         /* Just return the original SKB */
 639         return skb;
 640 }
 641
 642
 643 /* ethtool operations *******************************************************/
 644 static int
 645 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 646 {
 647         struct dsa_slave_priv *p = netdev_priv(dev);
 648         int err;
 649
 650         err = -EOPNOTSUPP;
 651         if (p->phy != NULL) {
 652                 err = phy_read_status(p->phy);
 653                 if (err == 0)
 654                         err = phy_ethtool_gset(p->phy, cmd);
 655         }
 656
 657         return err;
 658 }
 659
 660 static int
 661 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 662 {
 663         struct dsa_slave_priv *p = netdev_priv(dev);
 664
 665         if (p->phy != NULL)
 666                 return phy_ethtool_sset(p->phy, cmd);
 667
 668         return -EOPNOTSUPP;
 669 }
 670
 671 static void dsa_slave_get_drvinfo(struct net_device *dev,
 672                                   struct ethtool_drvinfo *drvinfo)
 673 {
 674         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 675         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 676         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 677         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 678 }
 679
 680 static int dsa_slave_get_regs_len(struct net_device *dev)
 681 {
 682         struct dsa_slave_priv *p = netdev_priv(dev);
 683         struct dsa_switch *ds = p->parent;
 684
 685         if (ds->drv->get_regs_len)
 686                 return ds->drv->get_regs_len(ds, p->port);
 687
 688         return -EOPNOTSUPP;
 689 }
 690
 691 static void
 692 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 693 {
 694         struct dsa_slave_priv *p = netdev_priv(dev);
 695         struct dsa_switch *ds = p->parent;
 696
 697         if (ds->drv->get_regs)
 698                 ds->drv->get_regs(ds, p->port, regs, _p);
 699 }
 700
 701 static int dsa_slave_nway_reset(struct net_device *dev)
 702 {
 703         struct dsa_slave_priv *p = netdev_priv(dev);
 704
 705         if (p->phy != NULL)
 706                 return genphy_restart_aneg(p->phy);
 707
 708         return -EOPNOTSUPP;
 709 }
 710
 711 static u32 dsa_slave_get_link(struct net_device *dev)
 712 {
 713         struct dsa_slave_priv *p = netdev_priv(dev);
 714
 715         if (p->phy != NULL) {
 716                 genphy_update_link(p->phy);
 717                 return p->phy->link;
 718         }
 719
 720         return -EOPNOTSUPP;
 721 }
 722
 723 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 724 {
 725         struct dsa_slave_priv *p = netdev_priv(dev);
 726         struct dsa_switch *ds = p->parent;
 727
 728         if (ds->pd->eeprom_len)
 729                 return ds->pd->eeprom_len;
 730
 731         if (ds->drv->get_eeprom_len)
 732                 return ds->drv->get_eeprom_len(ds);
 733
 734         return 0;
 735 }
 736
 737 static int dsa_slave_get_eeprom(struct net_device *dev,
 738                                 struct ethtool_eeprom *eeprom, u8 *data)
 739 {
 740         struct dsa_slave_priv *p = netdev_priv(dev);
 741         struct dsa_switch *ds = p->parent;
 742
 743         if (ds->drv->get_eeprom)
 744                 return ds->drv->get_eeprom(ds, eeprom, data);
 745
 746         return -EOPNOTSUPP;
 747 }
 748
 749 static int dsa_slave_set_eeprom(struct net_device *dev,
 750                                 struct ethtool_eeprom *eeprom, u8 *data)
 751 {
 752         struct dsa_slave_priv *p = netdev_priv(dev);
 753         struct dsa_switch *ds = p->parent;
 754
 755         if (ds->drv->set_eeprom)
 756                 return ds->drv->set_eeprom(ds, eeprom, data);
 757
 758         return -EOPNOTSUPP;
 759 }
 760
 761 static void dsa_slave_get_strings(struct net_device *dev,
 762                                   uint32_t stringset, uint8_t *data)
 763 {
 764         struct dsa_slave_priv *p = netdev_priv(dev);
 765         struct dsa_switch *ds = p->parent;
 766
 767         if (stringset == ETH_SS_STATS) {
 768                 int len = ETH_GSTRING_LEN;
 769
 770                 strncpy(data, "tx_packets", len);
 771                 strncpy(data + len, "tx_bytes", len);
 772                 strncpy(data + 2 * len, "rx_packets", len);
 773                 strncpy(data + 3 * len, "rx_bytes", len);
 774                 if (ds->drv->get_strings != NULL)
 775                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 776         }
 777 }
 778
 779 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 780                                         struct ethtool_stats *stats,
 781                                         uint64_t *data)
 782 {
 783         struct dsa_slave_priv *p = netdev_priv(dev);
 784         struct dsa_switch *ds = p->parent;
 785
 786         data[0] = p->dev->stats.tx_packets;
 787         data[1] = p->dev->stats.tx_bytes;
 788         data[2] = p->dev->stats.rx_packets;
 789         data[3] = p->dev->stats.rx_bytes;
 790         if (ds->drv->get_ethtool_stats != NULL)
 791                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 792 }
 793
 794 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 795 {
 796         struct dsa_slave_priv *p = netdev_priv(dev);
 797         struct dsa_switch *ds = p->parent;
 798
 799         if (sset == ETH_SS_STATS) {
 800                 int count;
 801
 802                 count = 4;
 803                 if (ds->drv->get_sset_count != NULL)
 804                         count += ds->drv->get_sset_count(ds);
 805
 806                 return count;
 807         }
 808
 809         return -EOPNOTSUPP;
 810 }
 811
 812 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 813 {
 814         struct dsa_slave_priv *p = netdev_priv(dev);
 815         struct dsa_switch *ds = p->parent;
 816
 817         if (ds->drv->get_wol)
 818                 ds->drv->get_wol(ds, p->port, w);
 819 }
 820
 821 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 822 {
 823         struct dsa_slave_priv *p = netdev_priv(dev);
 824         struct dsa_switch *ds = p->parent;
 825         int ret = -EOPNOTSUPP;
 826
 827         if (ds->drv->set_wol)
 828                 ret = ds->drv->set_wol(ds, p->port, w);
 829
 830         return ret;
 831 }
 832
 833 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 834 {
 835         struct dsa_slave_priv *p = netdev_priv(dev);
 836         struct dsa_switch *ds = p->parent;
 837         int ret;
 838
 839         if (!ds->drv->set_eee)
 840                 return -EOPNOTSUPP;
 841
 842         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 843         if (ret)
 844                 return ret;
 845
 846         if (p->phy)
 847                 ret = phy_ethtool_set_eee(p->phy, e);
 848
 849         return ret;
 850 }
 851
 852 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 853 {
 854         struct dsa_slave_priv *p = netdev_priv(dev);
 855         struct dsa_switch *ds = p->parent;
 856         int ret;
 857
 858         if (!ds->drv->get_eee)
 859                 return -EOPNOTSUPP;
 860
 861         ret = ds->drv->get_eee(ds, p->port, e);
 862         if (ret)
 863                 return ret;
 864
 865         if (p->phy)
 866                 ret = phy_ethtool_get_eee(p->phy, e);
 867
 868         return ret;
 869 }
 870
 871 #ifdef CONFIG_NET_POLL_CONTROLLER
 872 static int dsa_slave_netpoll_setup(struct net_device *dev,
 873                                    struct netpoll_info *ni)
 874 {
 875         struct dsa_slave_priv *p = netdev_priv(dev);
 876         struct dsa_switch *ds = p->parent;
 877         struct net_device *master = ds->dst->master_netdev;
 878         struct netpoll *netpoll;
 879         int err = 0;
 880
 881         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 882         if (!netpoll)
 883                 return -ENOMEM;
 884
 885         err = __netpoll_setup(netpoll, master);
 886         if (err) {
 887                 kfree(netpoll);
 888                 goto out;
 889         }
 890
 891         p->netpoll = netpoll;
 892 out:
 893         return err;
 894 }
 895
 896 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 897 {
 898         struct dsa_slave_priv *p = netdev_priv(dev);
 899         struct netpoll *netpoll = p->netpoll;
 900
 901         if (!netpoll)
 902                 return;
 903
 904         p->netpoll = NULL;
 905
 906         __netpoll_free_async(netpoll);
 907 }
 908
 909 static void dsa_slave_poll_controller(struct net_device *dev)
 910 {
 911 }
 912 #endif
 913
 914 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 915         .get_settings           = dsa_slave_get_settings,
 916         .set_settings           = dsa_slave_set_settings,
 917         .get_drvinfo            = dsa_slave_get_drvinfo,
 918         .get_regs_len           = dsa_slave_get_regs_len,
 919         .get_regs               = dsa_slave_get_regs,
 920         .nway_reset             = dsa_slave_nway_reset,
 921         .get_link               = dsa_slave_get_link,
 922         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 923         .get_eeprom             = dsa_slave_get_eeprom,
 924         .set_eeprom             = dsa_slave_set_eeprom,
 925         .get_strings            = dsa_slave_get_strings,
 926         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 927         .get_sset_count         = dsa_slave_get_sset_count,
 928         .set_wol                = dsa_slave_set_wol,
 929         .get_wol                = dsa_slave_get_wol,
 930         .set_eee                = dsa_slave_set_eee,
 931         .get_eee                = dsa_slave_get_eee,
 932 };
 933
 934 static const struct net_device_ops dsa_slave_netdev_ops = {
 935         .ndo_open               = dsa_slave_open,
 936         .ndo_stop               = dsa_slave_close,
 937         .ndo_start_xmit         = dsa_slave_xmit,
 938         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 939         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 940         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 941         .ndo_fdb_add            = switchdev_port_fdb_add,
 942         .ndo_fdb_del            = switchdev_port_fdb_del,
 943         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 944         .ndo_do_ioctl           = dsa_slave_ioctl,
 945         .ndo_get_iflink         = dsa_slave_get_iflink,
 946 #ifdef CONFIG_NET_POLL_CONTROLLER
 947         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 948         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 949         .ndo_poll_controller    = dsa_slave_poll_controller,
 950 #endif
 951         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 952         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 953         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 954 };
 955
 956 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 957         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 958         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 959         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 960         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 961         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 962 };
 963
 964 static struct device_type dsa_type = {
 965         .name   = "dsa",
 966 };
 967
 968 static void dsa_slave_adjust_link(struct net_device *dev)
 969 {
 970         struct dsa_slave_priv *p = netdev_priv(dev);
 971         struct dsa_switch *ds = p->parent;
 972         unsigned int status_changed = 0;
 973
 974         if (p->old_link != p->phy->link) {
 975                 status_changed = 1;
 976                 p->old_link = p->phy->link;
 977         }
 978
 979         if (p->old_duplex != p->phy->duplex) {
 980                 status_changed = 1;
 981                 p->old_duplex = p->phy->duplex;
 982         }
 983
 984         if (p->old_pause != p->phy->pause) {
 985                 status_changed = 1;
 986                 p->old_pause = p->phy->pause;
 987         }
 988
 989         if (ds->drv->adjust_link && status_changed)
 990                 ds->drv->adjust_link(ds, p->port, p->phy);
 991
 992         if (status_changed)
 993                 phy_print_status(p->phy);
 994 }
 995
 996 static int dsa_slave_fixed_link_update(struct net_device *dev,
 997                                        struct fixed_phy_status *status)
 998 {
 999         struct dsa_slave_priv *p = netdev_priv(dev);
1000         struct dsa_switch *ds = p->parent;
1001
1002         if (ds->drv->fixed_link_update)
1003                 ds->drv->fixed_link_update(ds, p->port, status);
1004
1005         return 0;
1006 }
1007
1008 /* slave device setup *******************************************************/
1009 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1010                                  struct net_device *slave_dev,
1011                                  int addr)
1012 {
1013         struct dsa_switch *ds = p->parent;
1014
1015         p->phy = ds->slave_mii_bus->phy_map[addr];
1016         if (!p->phy)
1017                 return -ENODEV;
1018
1019         /* Use already configured phy mode */
1020         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1021                 p->phy_interface = p->phy->interface;
1022         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1023                            p->phy_interface);
1024
1025         return 0;
1026 }
1027
1028 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1029                                 struct net_device *slave_dev)
1030 {
1031         struct dsa_switch *ds = p->parent;
1032         struct dsa_chip_data *cd = ds->pd;
1033         struct device_node *phy_dn, *port_dn;
1034         bool phy_is_fixed = false;
1035         u32 phy_flags = 0;
1036         int mode, ret;
1037
1038         port_dn = cd->port_dn[p->port];
1039         mode = of_get_phy_mode(port_dn);
1040         if (mode < 0)
1041                 mode = PHY_INTERFACE_MODE_NA;
1042         p->phy_interface = mode;
1043
1044         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1045         if (of_phy_is_fixed_link(port_dn)) {
1046                 /* In the case of a fixed PHY, the DT node associated
1047                  * to the fixed PHY is the Port DT node
1048                  */
1049                 ret = of_phy_register_fixed_link(port_dn);
1050                 if (ret) {
1051                         netdev_err(slave_dev, "failed to register fixed PHY\n");
1052                         return ret;
1053                 }
1054                 phy_is_fixed = true;
1055                 phy_dn = port_dn;
1056         }
1057
1058         if (ds->drv->get_phy_flags)
1059                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1060
1061         if (phy_dn) {
1062                 ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1063                 /* If this PHY address is part of phys_mii_mask, which means
1064                  * that we need to divert reads and writes to/from it, then we
1065                  * want to bind this device using the slave MII bus created by
1066                  * DSA to make that happen.
1067                  */
1068                 if (!phy_is_fixed && ret >= 0 &&
1069                     (ds->phys_mii_mask & (1 << ret))) {
1070                         ret = dsa_slave_phy_connect(p, slave_dev, ret);
1071                         if (ret)
1072                                 return ret;
1073                 } else {
1074                         p->phy = of_phy_connect(slave_dev, phy_dn,
1075                                                 dsa_slave_adjust_link,
1076                                                 phy_flags,
1077                                                 p->phy_interface);
1078                 }
1079         }
1080
1081         if (p->phy && phy_is_fixed)
1082                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1083
1084         /* We could not connect to a designated PHY, so use the switch internal
1085          * MDIO bus instead
1086          */
1087         if (!p->phy) {
1088                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1089                 if (ret)
1090                         return ret;
1091         } else {
1092                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
1093                             p->phy->addr, p->phy->drv->name);
1094         }
1095
1096         return 0;
1097 }
1098
1099 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1100 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1101                                             struct netdev_queue *txq,
1102                                             void *_unused)
1103 {
1104         lockdep_set_class(&txq->_xmit_lock,
1105                           &dsa_slave_netdev_xmit_lock_key);
1106 }
1107
1108 int dsa_slave_suspend(struct net_device *slave_dev)
1109 {
1110         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1111
1112         if (p->phy) {
1113                 phy_stop(p->phy);
1114                 p->old_pause = -1;
1115                 p->old_link = -1;
1116                 p->old_duplex = -1;
1117                 phy_suspend(p->phy);
1118         }
1119
1120         return 0;
1121 }
1122
1123 int dsa_slave_resume(struct net_device *slave_dev)
1124 {
1125         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1126
1127         netif_device_attach(slave_dev);
1128
1129         if (p->phy) {
1130                 phy_resume(p->phy);
1131                 phy_start(p->phy);
1132         }
1133
1134         return 0;
1135 }
1136
1137 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1138                      int port, char *name)
1139 {
1140         struct net_device *master = ds->dst->master_netdev;
1141         struct net_device *slave_dev;
1142         struct dsa_slave_priv *p;
1143         int ret;
1144
1145         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1146                                  NET_NAME_UNKNOWN, ether_setup);
1147         if (slave_dev == NULL)
1148                 return -ENOMEM;
1149
1150         slave_dev->features = master->vlan_features;
1151         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1152         eth_hw_addr_inherit(slave_dev, master);
1153         slave_dev->priv_flags |= IFF_NO_QUEUE;
1154         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1155         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1156         SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1157
1158         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1159                                  NULL);
1160
1161         SET_NETDEV_DEV(slave_dev, parent);
1162         slave_dev->dev.of_node = ds->pd->port_dn[port];
1163         slave_dev->vlan_features = master->vlan_features;
1164
1165         p = netdev_priv(slave_dev);
1166         p->dev = slave_dev;
1167         p->parent = ds;
1168         p->port = port;
1169
1170         switch (ds->dst->tag_protocol) {
1171 #ifdef CONFIG_NET_DSA_TAG_DSA
1172         case DSA_TAG_PROTO_DSA:
1173                 p->xmit = dsa_netdev_ops.xmit;
1174                 break;
1175 #endif
1176 #ifdef CONFIG_NET_DSA_TAG_EDSA
1177         case DSA_TAG_PROTO_EDSA:
1178                 p->xmit = edsa_netdev_ops.xmit;
1179                 break;
1180 #endif
1181 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1182         case DSA_TAG_PROTO_TRAILER:
1183                 p->xmit = trailer_netdev_ops.xmit;
1184                 break;
1185 #endif
1186 #ifdef CONFIG_NET_DSA_TAG_BRCM
1187         case DSA_TAG_PROTO_BRCM:
1188                 p->xmit = brcm_netdev_ops.xmit;
1189                 break;
1190 #endif
1191         default:
1192                 p->xmit = dsa_slave_notag_xmit;
1193                 break;
1194         }
1195
1196         p->old_pause = -1;
1197         p->old_link = -1;
1198         p->old_duplex = -1;
1199
1200         ret = dsa_slave_phy_setup(p, slave_dev);
1201         if (ret) {
1202                 free_netdev(slave_dev);
1203                 return ret;
1204         }
1205
1206         ds->ports[port] = slave_dev;
1207         ret = register_netdev(slave_dev);
1208         if (ret) {
1209                 netdev_err(master, "error %d registering interface %s\n",
1210                            ret, slave_dev->name);
1211                 phy_disconnect(p->phy);
1212                 ds->ports[port] = NULL;
1213                 free_netdev(slave_dev);
1214                 return ret;
1215         }
1216
1217         netif_carrier_off(slave_dev);
1218
1219         return 0;
1220 }
1221
1222 static bool dsa_slave_dev_check(struct net_device *dev)
1223 {
1224         return dev->netdev_ops == &dsa_slave_netdev_ops;
1225 }
1226
1227 static int dsa_slave_master_changed(struct net_device *dev)
1228 {
1229         struct net_device *master = netdev_master_upper_dev_get(dev);
1230         struct dsa_slave_priv *p = netdev_priv(dev);
1231         int err = 0;
1232
1233         if (master && master->rtnl_link_ops &&
1234             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1235                 err = dsa_slave_bridge_port_join(dev, master);
1236         else if (dsa_port_is_bridged(p))
1237                 err = dsa_slave_bridge_port_leave(dev);
1238
1239         return err;
1240 }
1241
1242 int dsa_slave_netdevice_event(struct notifier_block *unused,
1243                               unsigned long event, void *ptr)
1244 {
1245         struct net_device *dev;
1246         int err = 0;
1247
1248         switch (event) {
1249         case NETDEV_CHANGEUPPER:
1250                 dev = netdev_notifier_info_to_dev(ptr);
1251                 if (!dsa_slave_dev_check(dev))
1252                         goto out;
1253
1254                 err = dsa_slave_master_changed(dev);
1255                 if (err)
1256                         netdev_warn(dev, "failed to reflect master change\n");
1257
1258                 break;
1259         }
1260
1261 out:
1262         return NOTIFY_DONE;
1263 }