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 {
 247         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 248         struct dsa_slave_priv *p = netdev_priv(dev);
 249         struct dsa_switch *ds = p->parent;
 250         u16 vid;
 251         int err;
 252
 253         switch (obj->trans) {
 254         case SWITCHDEV_TRANS_PREPARE:
 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                 break;
 267         case SWITCHDEV_TRANS_COMMIT:
 268                 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 269                         err = ds->drv->port_vlan_add(ds, p->port, vid,
 270                                                      vlan->flags &
 271                                                      BRIDGE_VLAN_INFO_UNTAGGED);
 272                         if (!err && vlan->flags & BRIDGE_VLAN_INFO_PVID)
 273                                 err = ds->drv->port_pvid_set(ds, p->port, vid);
 274                         if (err)
 275                                 return err;
 276                 }
 277                 break;
 278         default:
 279                 return -EOPNOTSUPP;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static int dsa_slave_port_vlan_del(struct net_device *dev,
 286                                    struct switchdev_obj *obj)
 287 {
 288         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 289         struct dsa_slave_priv *p = netdev_priv(dev);
 290         struct dsa_switch *ds = p->parent;
 291         u16 vid;
 292         int err;
 293
 294         if (!ds->drv->port_vlan_del)
 295                 return -EOPNOTSUPP;
 296
 297         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 298                 err = ds->drv->port_vlan_del(ds, p->port, vid);
 299                 if (err)
 300                         return err;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int dsa_slave_port_vlan_dump(struct net_device *dev,
 307                                     struct switchdev_obj *obj)
 308 {
 309         struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 310         struct dsa_slave_priv *p = netdev_priv(dev);
 311         struct dsa_switch *ds = p->parent;
 312         DECLARE_BITMAP(members, DSA_MAX_PORTS);
 313         DECLARE_BITMAP(untagged, DSA_MAX_PORTS);
 314         u16 pvid, vid = 0;
 315         int err;
 316
 317         if (!ds->drv->vlan_getnext || !ds->drv->port_pvid_get)
 318                 return -EOPNOTSUPP;
 319
 320         err = ds->drv->port_pvid_get(ds, p->port, &pvid);
 321         if (err)
 322                 return err;
 323
 324         for (;;) {
 325                 err = ds->drv->vlan_getnext(ds, &vid, members, untagged);
 326                 if (err)
 327                         break;
 328
 329                 if (!test_bit(p->port, members))
 330                         continue;
 331
 332                 memset(vlan, 0, sizeof(*vlan));
 333                 vlan->vid_begin = vlan->vid_end = vid;
 334
 335                 if (vid == pvid)
 336                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 337
 338                 if (test_bit(p->port, untagged))
 339                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 340
 341                 err = obj->cb(dev, obj);
 342                 if (err)
 343                         break;
 344         }
 345
 346         return err == -ENOENT ? 0 : err;
 347 }
 348
 349 static int dsa_slave_port_fdb_add(struct net_device *dev,
 350                                   struct switchdev_obj *obj)
 351 {
 352         struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 353         struct dsa_slave_priv *p = netdev_priv(dev);
 354         struct dsa_switch *ds = p->parent;
 355         int ret = -EOPNOTSUPP;
 356
 357         if (obj->trans == SWITCHDEV_TRANS_PREPARE)
 358                 ret = ds->drv->port_fdb_add ? 0 : -EOPNOTSUPP;
 359         else if (obj->trans == SWITCHDEV_TRANS_COMMIT)
 360                 ret = ds->drv->port_fdb_add(ds, p->port, fdb->addr, fdb->vid);
 361
 362         return ret;
 363 }
 364
 365 static int dsa_slave_port_fdb_del(struct net_device *dev,
 366                                   struct switchdev_obj *obj)
 367 {
 368         struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 369         struct dsa_slave_priv *p = netdev_priv(dev);
 370         struct dsa_switch *ds = p->parent;
 371         int ret = -EOPNOTSUPP;
 372
 373         if (ds->drv->port_fdb_del)
 374                 ret = ds->drv->port_fdb_del(ds, p->port, fdb->addr, fdb->vid);
 375
 376         return ret;
 377 }
 378
 379 static int dsa_slave_port_fdb_dump(struct net_device *dev,
 380                                    struct switchdev_obj *obj)
 381 {
 382         struct dsa_slave_priv *p = netdev_priv(dev);
 383         struct dsa_switch *ds = p->parent;
 384         unsigned char addr[ETH_ALEN] = { 0 };
 385         u16 vid = 0;
 386         int ret;
 387
 388         if (!ds->drv->port_fdb_getnext)
 389                 return -EOPNOTSUPP;
 390
 391         for (;;) {
 392                 bool is_static;
 393
 394                 ret = ds->drv->port_fdb_getnext(ds, p->port, addr, &vid,
 395                                                 &is_static);
 396                 if (ret < 0)
 397                         break;
 398
 399                 obj->u.fdb.addr = addr;
 400                 obj->u.fdb.vid = vid;
 401                 obj->u.fdb.ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
 402
 403                 ret = obj->cb(dev, obj);
 404                 if (ret < 0)
 405                         break;
 406         }
 407
 408         return ret == -ENOENT ? 0 : ret;
 409 }
 410
 411 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 412 {
 413         struct dsa_slave_priv *p = netdev_priv(dev);
 414
 415         if (p->phy != NULL)
 416                 return phy_mii_ioctl(p->phy, ifr, cmd);
 417
 418         return -EOPNOTSUPP;
 419 }
 420
 421 /* Return a bitmask of all ports being currently bridged within a given bridge
 422  * device. Note that on leave, the mask will still return the bitmask of ports
 423  * currently bridged, prior to port removal, and this is exactly what we want.
 424  */
 425 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
 426                                   struct net_device *bridge)
 427 {
 428         struct dsa_slave_priv *p;
 429         unsigned int port;
 430         u32 mask = 0;
 431
 432         for (port = 0; port < DSA_MAX_PORTS; port++) {
 433                 if (!dsa_is_port_initialized(ds, port))
 434                         continue;
 435
 436                 p = netdev_priv(ds->ports[port]);
 437
 438                 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
 439                     p->bridge_dev == bridge)
 440                         mask |= 1 << port;
 441         }
 442
 443         return mask;
 444 }
 445
 446 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
 447 {
 448         struct dsa_slave_priv *p = netdev_priv(dev);
 449         struct dsa_switch *ds = p->parent;
 450         int ret = -EOPNOTSUPP;
 451
 452         if (ds->drv->port_stp_update)
 453                 ret = ds->drv->port_stp_update(ds, p->port, state);
 454
 455         return ret;
 456 }
 457
 458 static int dsa_slave_port_attr_set(struct net_device *dev,
 459                                    struct switchdev_attr *attr)
 460 {
 461         int ret = 0;
 462
 463         switch (attr->id) {
 464         case SWITCHDEV_ATTR_PORT_STP_STATE:
 465                 if (attr->trans == SWITCHDEV_TRANS_COMMIT)
 466                         ret = dsa_slave_stp_update(dev, attr->u.stp_state);
 467                 break;
 468         default:
 469                 ret = -EOPNOTSUPP;
 470                 break;
 471         }
 472
 473         return ret;
 474 }
 475
 476 static int dsa_slave_port_obj_add(struct net_device *dev,
 477                                   struct switchdev_obj *obj)
 478 {
 479         int err;
 480
 481         /* For the prepare phase, ensure the full set of changes is feasable in
 482          * one go in order to signal a failure properly. If an operation is not
 483          * supported, return -EOPNOTSUPP.
 484          */
 485
 486         switch (obj->id) {
 487         case SWITCHDEV_OBJ_PORT_FDB:
 488                 err = dsa_slave_port_fdb_add(dev, obj);
 489                 break;
 490         case SWITCHDEV_OBJ_PORT_VLAN:
 491                 err = dsa_slave_port_vlan_add(dev, obj);
 492                 break;
 493         default:
 494                 err = -EOPNOTSUPP;
 495                 break;
 496         }
 497
 498         return err;
 499 }
 500
 501 static int dsa_slave_port_obj_del(struct net_device *dev,
 502                                   struct switchdev_obj *obj)
 503 {
 504         int err;
 505
 506         switch (obj->id) {
 507         case SWITCHDEV_OBJ_PORT_FDB:
 508                 err = dsa_slave_port_fdb_del(dev, obj);
 509                 break;
 510         case SWITCHDEV_OBJ_PORT_VLAN:
 511                 err = dsa_slave_port_vlan_del(dev, obj);
 512                 break;
 513         default:
 514                 err = -EOPNOTSUPP;
 515                 break;
 516         }
 517
 518         return err;
 519 }
 520
 521 static int dsa_slave_port_obj_dump(struct net_device *dev,
 522                                    struct switchdev_obj *obj)
 523 {
 524         int err;
 525
 526         switch (obj->id) {
 527         case SWITCHDEV_OBJ_PORT_FDB:
 528                 err = dsa_slave_port_fdb_dump(dev, obj);
 529                 break;
 530         case SWITCHDEV_OBJ_PORT_VLAN:
 531                 err = dsa_slave_port_vlan_dump(dev, obj);
 532                 break;
 533         default:
 534                 err = -EOPNOTSUPP;
 535                 break;
 536         }
 537
 538         return err;
 539 }
 540
 541 static int dsa_slave_bridge_port_join(struct net_device *dev,
 542                                       struct net_device *br)
 543 {
 544         struct dsa_slave_priv *p = netdev_priv(dev);
 545         struct dsa_switch *ds = p->parent;
 546         int ret = -EOPNOTSUPP;
 547
 548         p->bridge_dev = br;
 549
 550         if (ds->drv->port_join_bridge)
 551                 ret = ds->drv->port_join_bridge(ds, p->port,
 552                                                 dsa_slave_br_port_mask(ds, br));
 553
 554         return ret;
 555 }
 556
 557 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 558 {
 559         struct dsa_slave_priv *p = netdev_priv(dev);
 560         struct dsa_switch *ds = p->parent;
 561         int ret = -EOPNOTSUPP;
 562
 563
 564         if (ds->drv->port_leave_bridge)
 565                 ret = ds->drv->port_leave_bridge(ds, p->port,
 566                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 567
 568         p->bridge_dev = NULL;
 569
 570         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 571          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 572          */
 573         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 574
 575         return ret;
 576 }
 577
 578 static int dsa_slave_port_attr_get(struct net_device *dev,
 579                                    struct switchdev_attr *attr)
 580 {
 581         struct dsa_slave_priv *p = netdev_priv(dev);
 582         struct dsa_switch *ds = p->parent;
 583
 584         switch (attr->id) {
 585         case SWITCHDEV_ATTR_PORT_PARENT_ID:
 586                 attr->u.ppid.id_len = sizeof(ds->index);
 587                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 588                 break;
 589         default:
 590                 return -EOPNOTSUPP;
 591         }
 592
 593         return 0;
 594 }
 595
 596 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 597                                                struct sk_buff *skb)
 598 {
 599 #ifdef CONFIG_NET_POLL_CONTROLLER
 600         if (p->netpoll)
 601                 netpoll_send_skb(p->netpoll, skb);
 602 #else
 603         BUG();
 604 #endif
 605         return NETDEV_TX_OK;
 606 }
 607
 608 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 609 {
 610         struct dsa_slave_priv *p = netdev_priv(dev);
 611         struct sk_buff *nskb;
 612
 613         dev->stats.tx_packets++;
 614         dev->stats.tx_bytes += skb->len;
 615
 616         /* Transmit function may have to reallocate the original SKB */
 617         nskb = p->xmit(skb, dev);
 618         if (!nskb)
 619                 return NETDEV_TX_OK;
 620
 621         /* SKB for netpoll still need to be mangled with the protocol-specific
 622          * tag to be successfully transmitted
 623          */
 624         if (unlikely(netpoll_tx_running(dev)))
 625                 return dsa_netpoll_send_skb(p, nskb);
 626
 627         /* Queue the SKB for transmission on the parent interface, but
 628          * do not modify its EtherType
 629          */
 630         nskb->dev = p->parent->dst->master_netdev;
 631         dev_queue_xmit(nskb);
 632
 633         return NETDEV_TX_OK;
 634 }
 635
 636 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 637                                             struct net_device *dev)
 638 {
 639         /* Just return the original SKB */
 640         return skb;
 641 }
 642
 643
 644 /* ethtool operations *******************************************************/
 645 static int
 646 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 647 {
 648         struct dsa_slave_priv *p = netdev_priv(dev);
 649         int err;
 650
 651         err = -EOPNOTSUPP;
 652         if (p->phy != NULL) {
 653                 err = phy_read_status(p->phy);
 654                 if (err == 0)
 655                         err = phy_ethtool_gset(p->phy, cmd);
 656         }
 657
 658         return err;
 659 }
 660
 661 static int
 662 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 663 {
 664         struct dsa_slave_priv *p = netdev_priv(dev);
 665
 666         if (p->phy != NULL)
 667                 return phy_ethtool_sset(p->phy, cmd);
 668
 669         return -EOPNOTSUPP;
 670 }
 671
 672 static void dsa_slave_get_drvinfo(struct net_device *dev,
 673                                   struct ethtool_drvinfo *drvinfo)
 674 {
 675         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 676         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 677         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 678         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 679 }
 680
 681 static int dsa_slave_get_regs_len(struct net_device *dev)
 682 {
 683         struct dsa_slave_priv *p = netdev_priv(dev);
 684         struct dsa_switch *ds = p->parent;
 685
 686         if (ds->drv->get_regs_len)
 687                 return ds->drv->get_regs_len(ds, p->port);
 688
 689         return -EOPNOTSUPP;
 690 }
 691
 692 static void
 693 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 694 {
 695         struct dsa_slave_priv *p = netdev_priv(dev);
 696         struct dsa_switch *ds = p->parent;
 697
 698         if (ds->drv->get_regs)
 699                 ds->drv->get_regs(ds, p->port, regs, _p);
 700 }
 701
 702 static int dsa_slave_nway_reset(struct net_device *dev)
 703 {
 704         struct dsa_slave_priv *p = netdev_priv(dev);
 705
 706         if (p->phy != NULL)
 707                 return genphy_restart_aneg(p->phy);
 708
 709         return -EOPNOTSUPP;
 710 }
 711
 712 static u32 dsa_slave_get_link(struct net_device *dev)
 713 {
 714         struct dsa_slave_priv *p = netdev_priv(dev);
 715
 716         if (p->phy != NULL) {
 717                 genphy_update_link(p->phy);
 718                 return p->phy->link;
 719         }
 720
 721         return -EOPNOTSUPP;
 722 }
 723
 724 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 725 {
 726         struct dsa_slave_priv *p = netdev_priv(dev);
 727         struct dsa_switch *ds = p->parent;
 728
 729         if (ds->pd->eeprom_len)
 730                 return ds->pd->eeprom_len;
 731
 732         if (ds->drv->get_eeprom_len)
 733                 return ds->drv->get_eeprom_len(ds);
 734
 735         return 0;
 736 }
 737
 738 static int dsa_slave_get_eeprom(struct net_device *dev,
 739                                 struct ethtool_eeprom *eeprom, u8 *data)
 740 {
 741         struct dsa_slave_priv *p = netdev_priv(dev);
 742         struct dsa_switch *ds = p->parent;
 743
 744         if (ds->drv->get_eeprom)
 745                 return ds->drv->get_eeprom(ds, eeprom, data);
 746
 747         return -EOPNOTSUPP;
 748 }
 749
 750 static int dsa_slave_set_eeprom(struct net_device *dev,
 751                                 struct ethtool_eeprom *eeprom, u8 *data)
 752 {
 753         struct dsa_slave_priv *p = netdev_priv(dev);
 754         struct dsa_switch *ds = p->parent;
 755
 756         if (ds->drv->set_eeprom)
 757                 return ds->drv->set_eeprom(ds, eeprom, data);
 758
 759         return -EOPNOTSUPP;
 760 }
 761
 762 static void dsa_slave_get_strings(struct net_device *dev,
 763                                   uint32_t stringset, uint8_t *data)
 764 {
 765         struct dsa_slave_priv *p = netdev_priv(dev);
 766         struct dsa_switch *ds = p->parent;
 767
 768         if (stringset == ETH_SS_STATS) {
 769                 int len = ETH_GSTRING_LEN;
 770
 771                 strncpy(data, "tx_packets", len);
 772                 strncpy(data + len, "tx_bytes", len);
 773                 strncpy(data + 2 * len, "rx_packets", len);
 774                 strncpy(data + 3 * len, "rx_bytes", len);
 775                 if (ds->drv->get_strings != NULL)
 776                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 777         }
 778 }
 779
 780 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 781                                         struct ethtool_stats *stats,
 782                                         uint64_t *data)
 783 {
 784         struct dsa_slave_priv *p = netdev_priv(dev);
 785         struct dsa_switch *ds = p->parent;
 786
 787         data[0] = p->dev->stats.tx_packets;
 788         data[1] = p->dev->stats.tx_bytes;
 789         data[2] = p->dev->stats.rx_packets;
 790         data[3] = p->dev->stats.rx_bytes;
 791         if (ds->drv->get_ethtool_stats != NULL)
 792                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 793 }
 794
 795 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 796 {
 797         struct dsa_slave_priv *p = netdev_priv(dev);
 798         struct dsa_switch *ds = p->parent;
 799
 800         if (sset == ETH_SS_STATS) {
 801                 int count;
 802
 803                 count = 4;
 804                 if (ds->drv->get_sset_count != NULL)
 805                         count += ds->drv->get_sset_count(ds);
 806
 807                 return count;
 808         }
 809
 810         return -EOPNOTSUPP;
 811 }
 812
 813 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 814 {
 815         struct dsa_slave_priv *p = netdev_priv(dev);
 816         struct dsa_switch *ds = p->parent;
 817
 818         if (ds->drv->get_wol)
 819                 ds->drv->get_wol(ds, p->port, w);
 820 }
 821
 822 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 823 {
 824         struct dsa_slave_priv *p = netdev_priv(dev);
 825         struct dsa_switch *ds = p->parent;
 826         int ret = -EOPNOTSUPP;
 827
 828         if (ds->drv->set_wol)
 829                 ret = ds->drv->set_wol(ds, p->port, w);
 830
 831         return ret;
 832 }
 833
 834 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 835 {
 836         struct dsa_slave_priv *p = netdev_priv(dev);
 837         struct dsa_switch *ds = p->parent;
 838         int ret;
 839
 840         if (!ds->drv->set_eee)
 841                 return -EOPNOTSUPP;
 842
 843         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 844         if (ret)
 845                 return ret;
 846
 847         if (p->phy)
 848                 ret = phy_ethtool_set_eee(p->phy, e);
 849
 850         return ret;
 851 }
 852
 853 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 854 {
 855         struct dsa_slave_priv *p = netdev_priv(dev);
 856         struct dsa_switch *ds = p->parent;
 857         int ret;
 858
 859         if (!ds->drv->get_eee)
 860                 return -EOPNOTSUPP;
 861
 862         ret = ds->drv->get_eee(ds, p->port, e);
 863         if (ret)
 864                 return ret;
 865
 866         if (p->phy)
 867                 ret = phy_ethtool_get_eee(p->phy, e);
 868
 869         return ret;
 870 }
 871
 872 #ifdef CONFIG_NET_POLL_CONTROLLER
 873 static int dsa_slave_netpoll_setup(struct net_device *dev,
 874                                    struct netpoll_info *ni)
 875 {
 876         struct dsa_slave_priv *p = netdev_priv(dev);
 877         struct dsa_switch *ds = p->parent;
 878         struct net_device *master = ds->dst->master_netdev;
 879         struct netpoll *netpoll;
 880         int err = 0;
 881
 882         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 883         if (!netpoll)
 884                 return -ENOMEM;
 885
 886         err = __netpoll_setup(netpoll, master);
 887         if (err) {
 888                 kfree(netpoll);
 889                 goto out;
 890         }
 891
 892         p->netpoll = netpoll;
 893 out:
 894         return err;
 895 }
 896
 897 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 898 {
 899         struct dsa_slave_priv *p = netdev_priv(dev);
 900         struct netpoll *netpoll = p->netpoll;
 901
 902         if (!netpoll)
 903                 return;
 904
 905         p->netpoll = NULL;
 906
 907         __netpoll_free_async(netpoll);
 908 }
 909
 910 static void dsa_slave_poll_controller(struct net_device *dev)
 911 {
 912 }
 913 #endif
 914
 915 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 916         .get_settings           = dsa_slave_get_settings,
 917         .set_settings           = dsa_slave_set_settings,
 918         .get_drvinfo            = dsa_slave_get_drvinfo,
 919         .get_regs_len           = dsa_slave_get_regs_len,
 920         .get_regs               = dsa_slave_get_regs,
 921         .nway_reset             = dsa_slave_nway_reset,
 922         .get_link               = dsa_slave_get_link,
 923         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 924         .get_eeprom             = dsa_slave_get_eeprom,
 925         .set_eeprom             = dsa_slave_set_eeprom,
 926         .get_strings            = dsa_slave_get_strings,
 927         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 928         .get_sset_count         = dsa_slave_get_sset_count,
 929         .set_wol                = dsa_slave_set_wol,
 930         .get_wol                = dsa_slave_get_wol,
 931         .set_eee                = dsa_slave_set_eee,
 932         .get_eee                = dsa_slave_get_eee,
 933 };
 934
 935 static const struct net_device_ops dsa_slave_netdev_ops = {
 936         .ndo_open               = dsa_slave_open,
 937         .ndo_stop               = dsa_slave_close,
 938         .ndo_start_xmit         = dsa_slave_xmit,
 939         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 940         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 941         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 942         .ndo_fdb_add            = switchdev_port_fdb_add,
 943         .ndo_fdb_del            = switchdev_port_fdb_del,
 944         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 945         .ndo_do_ioctl           = dsa_slave_ioctl,
 946         .ndo_get_iflink         = dsa_slave_get_iflink,
 947 #ifdef CONFIG_NET_POLL_CONTROLLER
 948         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 949         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 950         .ndo_poll_controller    = dsa_slave_poll_controller,
 951 #endif
 952         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 953         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 954         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 955 };
 956
 957 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 958         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 959         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 960         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 961         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 962         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 963 };
 964
 965 static void dsa_slave_adjust_link(struct net_device *dev)
 966 {
 967         struct dsa_slave_priv *p = netdev_priv(dev);
 968         struct dsa_switch *ds = p->parent;
 969         unsigned int status_changed = 0;
 970
 971         if (p->old_link != p->phy->link) {
 972                 status_changed = 1;
 973                 p->old_link = p->phy->link;
 974         }
 975
 976         if (p->old_duplex != p->phy->duplex) {
 977                 status_changed = 1;
 978                 p->old_duplex = p->phy->duplex;
 979         }
 980
 981         if (p->old_pause != p->phy->pause) {
 982                 status_changed = 1;
 983                 p->old_pause = p->phy->pause;
 984         }
 985
 986         if (ds->drv->adjust_link && status_changed)
 987                 ds->drv->adjust_link(ds, p->port, p->phy);
 988
 989         if (status_changed)
 990                 phy_print_status(p->phy);
 991 }
 992
 993 static int dsa_slave_fixed_link_update(struct net_device *dev,
 994                                        struct fixed_phy_status *status)
 995 {
 996         struct dsa_slave_priv *p = netdev_priv(dev);
 997         struct dsa_switch *ds = p->parent;
 998
 999         if (ds->drv->fixed_link_update)
1000                 ds->drv->fixed_link_update(ds, p->port, status);
1001
1002         return 0;
1003 }
1004
1005 /* slave device setup *******************************************************/
1006 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1007                                  struct net_device *slave_dev,
1008                                  int addr)
1009 {
1010         struct dsa_switch *ds = p->parent;
1011
1012         p->phy = ds->slave_mii_bus->phy_map[addr];
1013         if (!p->phy)
1014                 return -ENODEV;
1015
1016         /* Use already configured phy mode */
1017         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1018                 p->phy_interface = p->phy->interface;
1019         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1020                            p->phy_interface);
1021
1022         return 0;
1023 }
1024
1025 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1026                                 struct net_device *slave_dev)
1027 {
1028         struct dsa_switch *ds = p->parent;
1029         struct dsa_chip_data *cd = ds->pd;
1030         struct device_node *phy_dn, *port_dn;
1031         bool phy_is_fixed = false;
1032         u32 phy_flags = 0;
1033         int mode, ret;
1034
1035         port_dn = cd->port_dn[p->port];
1036         mode = of_get_phy_mode(port_dn);
1037         if (mode < 0)
1038                 mode = PHY_INTERFACE_MODE_NA;
1039         p->phy_interface = mode;
1040
1041         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1042         if (of_phy_is_fixed_link(port_dn)) {
1043                 /* In the case of a fixed PHY, the DT node associated
1044                  * to the fixed PHY is the Port DT node
1045                  */
1046                 ret = of_phy_register_fixed_link(port_dn);
1047                 if (ret) {
1048                         netdev_err(slave_dev, "failed to register fixed PHY\n");
1049                         return ret;
1050                 }
1051                 phy_is_fixed = true;
1052                 phy_dn = port_dn;
1053         }
1054
1055         if (ds->drv->get_phy_flags)
1056                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1057
1058         if (phy_dn) {
1059                 ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1060                 /* If this PHY address is part of phys_mii_mask, which means
1061                  * that we need to divert reads and writes to/from it, then we
1062                  * want to bind this device using the slave MII bus created by
1063                  * DSA to make that happen.
1064                  */
1065                 if (!phy_is_fixed && ret >= 0 &&
1066                     (ds->phys_mii_mask & (1 << ret))) {
1067                         ret = dsa_slave_phy_connect(p, slave_dev, ret);
1068                         if (ret)
1069                                 return ret;
1070                 } else {
1071                         p->phy = of_phy_connect(slave_dev, phy_dn,
1072                                                 dsa_slave_adjust_link,
1073                                                 phy_flags,
1074                                                 p->phy_interface);
1075                 }
1076         }
1077
1078         if (p->phy && phy_is_fixed)
1079                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1080
1081         /* We could not connect to a designated PHY, so use the switch internal
1082          * MDIO bus instead
1083          */
1084         if (!p->phy) {
1085                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1086                 if (ret)
1087                         return ret;
1088         } else {
1089                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
1090                             p->phy->addr, p->phy->drv->name);
1091         }
1092
1093         return 0;
1094 }
1095
1096 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1097 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1098                                             struct netdev_queue *txq,
1099                                             void *_unused)
1100 {
1101         lockdep_set_class(&txq->_xmit_lock,
1102                           &dsa_slave_netdev_xmit_lock_key);
1103 }
1104
1105 int dsa_slave_suspend(struct net_device *slave_dev)
1106 {
1107         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1108
1109         if (p->phy) {
1110                 phy_stop(p->phy);
1111                 p->old_pause = -1;
1112                 p->old_link = -1;
1113                 p->old_duplex = -1;
1114                 phy_suspend(p->phy);
1115         }
1116
1117         return 0;
1118 }
1119
1120 int dsa_slave_resume(struct net_device *slave_dev)
1121 {
1122         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1123
1124         netif_device_attach(slave_dev);
1125
1126         if (p->phy) {
1127                 phy_resume(p->phy);
1128                 phy_start(p->phy);
1129         }
1130
1131         return 0;
1132 }
1133
1134 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1135                      int port, char *name)
1136 {
1137         struct net_device *master = ds->dst->master_netdev;
1138         struct net_device *slave_dev;
1139         struct dsa_slave_priv *p;
1140         int ret;
1141
1142         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1143                                  NET_NAME_UNKNOWN, ether_setup);
1144         if (slave_dev == NULL)
1145                 return -ENOMEM;
1146
1147         slave_dev->features = master->vlan_features;
1148         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1149         eth_hw_addr_inherit(slave_dev, master);
1150         slave_dev->priv_flags |= IFF_NO_QUEUE;
1151         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1152         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1153
1154         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1155                                  NULL);
1156
1157         SET_NETDEV_DEV(slave_dev, parent);
1158         slave_dev->dev.of_node = ds->pd->port_dn[port];
1159         slave_dev->vlan_features = master->vlan_features;
1160
1161         p = netdev_priv(slave_dev);
1162         p->dev = slave_dev;
1163         p->parent = ds;
1164         p->port = port;
1165
1166         switch (ds->dst->tag_protocol) {
1167 #ifdef CONFIG_NET_DSA_TAG_DSA
1168         case DSA_TAG_PROTO_DSA:
1169                 p->xmit = dsa_netdev_ops.xmit;
1170                 break;
1171 #endif
1172 #ifdef CONFIG_NET_DSA_TAG_EDSA
1173         case DSA_TAG_PROTO_EDSA:
1174                 p->xmit = edsa_netdev_ops.xmit;
1175                 break;
1176 #endif
1177 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1178         case DSA_TAG_PROTO_TRAILER:
1179                 p->xmit = trailer_netdev_ops.xmit;
1180                 break;
1181 #endif
1182 #ifdef CONFIG_NET_DSA_TAG_BRCM
1183         case DSA_TAG_PROTO_BRCM:
1184                 p->xmit = brcm_netdev_ops.xmit;
1185                 break;
1186 #endif
1187         default:
1188                 p->xmit = dsa_slave_notag_xmit;
1189                 break;
1190         }
1191
1192         p->old_pause = -1;
1193         p->old_link = -1;
1194         p->old_duplex = -1;
1195
1196         ret = dsa_slave_phy_setup(p, slave_dev);
1197         if (ret) {
1198                 free_netdev(slave_dev);
1199                 return ret;
1200         }
1201
1202         ds->ports[port] = slave_dev;
1203         ret = register_netdev(slave_dev);
1204         if (ret) {
1205                 netdev_err(master, "error %d registering interface %s\n",
1206                            ret, slave_dev->name);
1207                 phy_disconnect(p->phy);
1208                 ds->ports[port] = NULL;
1209                 free_netdev(slave_dev);
1210                 return ret;
1211         }
1212
1213         netif_carrier_off(slave_dev);
1214
1215         return 0;
1216 }
1217
1218 static bool dsa_slave_dev_check(struct net_device *dev)
1219 {
1220         return dev->netdev_ops == &dsa_slave_netdev_ops;
1221 }
1222
1223 static int dsa_slave_master_changed(struct net_device *dev)
1224 {
1225         struct net_device *master = netdev_master_upper_dev_get(dev);
1226         struct dsa_slave_priv *p = netdev_priv(dev);
1227         int err = 0;
1228
1229         if (master && master->rtnl_link_ops &&
1230             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1231                 err = dsa_slave_bridge_port_join(dev, master);
1232         else if (dsa_port_is_bridged(p))
1233                 err = dsa_slave_bridge_port_leave(dev);
1234
1235         return err;
1236 }
1237
1238 int dsa_slave_netdevice_event(struct notifier_block *unused,
1239                               unsigned long event, void *ptr)
1240 {
1241         struct net_device *dev;
1242         int err = 0;
1243
1244         switch (event) {
1245         case NETDEV_CHANGEUPPER:
1246                 dev = netdev_notifier_info_to_dev(ptr);
1247                 if (!dsa_slave_dev_check(dev))
1248                         goto out;
1249
1250                 err = dsa_slave_master_changed(dev);
1251                 if (err)
1252                         netdev_warn(dev, "failed to reflect master change\n");
1253
1254                 break;
1255         }
1256
1257 out:
1258         return NOTIFY_DONE;
1259 }