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         struct dsa_slave_priv *p = netdev_priv(dev);
 462         struct dsa_switch *ds = p->parent;
 463         int ret;
 464
 465         switch (attr->id) {
 466         case SWITCHDEV_ATTR_PORT_STP_STATE:
 467                 if (attr->trans == SWITCHDEV_TRANS_PREPARE)
 468                         ret = ds->drv->port_stp_update ? 0 : -EOPNOTSUPP;
 469                 else
 470                         ret = ds->drv->port_stp_update(ds, p->port,
 471                                                        attr->u.stp_state);
 472                 break;
 473         default:
 474                 ret = -EOPNOTSUPP;
 475                 break;
 476         }
 477
 478         return ret;
 479 }
 480
 481 static int dsa_slave_port_obj_add(struct net_device *dev,
 482                                   struct switchdev_obj *obj)
 483 {
 484         int err;
 485
 486         /* For the prepare phase, ensure the full set of changes is feasable in
 487          * one go in order to signal a failure properly. If an operation is not
 488          * supported, return -EOPNOTSUPP.
 489          */
 490
 491         switch (obj->id) {
 492         case SWITCHDEV_OBJ_PORT_FDB:
 493                 err = dsa_slave_port_fdb_add(dev, obj);
 494                 break;
 495         case SWITCHDEV_OBJ_PORT_VLAN:
 496                 err = dsa_slave_port_vlan_add(dev, obj);
 497                 break;
 498         default:
 499                 err = -EOPNOTSUPP;
 500                 break;
 501         }
 502
 503         return err;
 504 }
 505
 506 static int dsa_slave_port_obj_del(struct net_device *dev,
 507                                   struct switchdev_obj *obj)
 508 {
 509         int err;
 510
 511         switch (obj->id) {
 512         case SWITCHDEV_OBJ_PORT_FDB:
 513                 err = dsa_slave_port_fdb_del(dev, obj);
 514                 break;
 515         case SWITCHDEV_OBJ_PORT_VLAN:
 516                 err = dsa_slave_port_vlan_del(dev, obj);
 517                 break;
 518         default:
 519                 err = -EOPNOTSUPP;
 520                 break;
 521         }
 522
 523         return err;
 524 }
 525
 526 static int dsa_slave_port_obj_dump(struct net_device *dev,
 527                                    struct switchdev_obj *obj)
 528 {
 529         int err;
 530
 531         switch (obj->id) {
 532         case SWITCHDEV_OBJ_PORT_FDB:
 533                 err = dsa_slave_port_fdb_dump(dev, obj);
 534                 break;
 535         case SWITCHDEV_OBJ_PORT_VLAN:
 536                 err = dsa_slave_port_vlan_dump(dev, obj);
 537                 break;
 538         default:
 539                 err = -EOPNOTSUPP;
 540                 break;
 541         }
 542
 543         return err;
 544 }
 545
 546 static int dsa_slave_bridge_port_join(struct net_device *dev,
 547                                       struct net_device *br)
 548 {
 549         struct dsa_slave_priv *p = netdev_priv(dev);
 550         struct dsa_switch *ds = p->parent;
 551         int ret = -EOPNOTSUPP;
 552
 553         p->bridge_dev = br;
 554
 555         if (ds->drv->port_join_bridge)
 556                 ret = ds->drv->port_join_bridge(ds, p->port,
 557                                                 dsa_slave_br_port_mask(ds, br));
 558
 559         return ret;
 560 }
 561
 562 static int dsa_slave_bridge_port_leave(struct net_device *dev)
 563 {
 564         struct dsa_slave_priv *p = netdev_priv(dev);
 565         struct dsa_switch *ds = p->parent;
 566         int ret = -EOPNOTSUPP;
 567
 568
 569         if (ds->drv->port_leave_bridge)
 570                 ret = ds->drv->port_leave_bridge(ds, p->port,
 571                                                  dsa_slave_br_port_mask(ds, p->bridge_dev));
 572
 573         p->bridge_dev = NULL;
 574
 575         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 576          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 577          */
 578         dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
 579
 580         return ret;
 581 }
 582
 583 static int dsa_slave_port_attr_get(struct net_device *dev,
 584                                    struct switchdev_attr *attr)
 585 {
 586         struct dsa_slave_priv *p = netdev_priv(dev);
 587         struct dsa_switch *ds = p->parent;
 588
 589         switch (attr->id) {
 590         case SWITCHDEV_ATTR_PORT_PARENT_ID:
 591                 attr->u.ppid.id_len = sizeof(ds->index);
 592                 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
 593                 break;
 594         default:
 595                 return -EOPNOTSUPP;
 596         }
 597
 598         return 0;
 599 }
 600
 601 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
 602                                                struct sk_buff *skb)
 603 {
 604 #ifdef CONFIG_NET_POLL_CONTROLLER
 605         if (p->netpoll)
 606                 netpoll_send_skb(p->netpoll, skb);
 607 #else
 608         BUG();
 609 #endif
 610         return NETDEV_TX_OK;
 611 }
 612
 613 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 614 {
 615         struct dsa_slave_priv *p = netdev_priv(dev);
 616         struct sk_buff *nskb;
 617
 618         dev->stats.tx_packets++;
 619         dev->stats.tx_bytes += skb->len;
 620
 621         /* Transmit function may have to reallocate the original SKB */
 622         nskb = p->xmit(skb, dev);
 623         if (!nskb)
 624                 return NETDEV_TX_OK;
 625
 626         /* SKB for netpoll still need to be mangled with the protocol-specific
 627          * tag to be successfully transmitted
 628          */
 629         if (unlikely(netpoll_tx_running(dev)))
 630                 return dsa_netpoll_send_skb(p, nskb);
 631
 632         /* Queue the SKB for transmission on the parent interface, but
 633          * do not modify its EtherType
 634          */
 635         nskb->dev = p->parent->dst->master_netdev;
 636         dev_queue_xmit(nskb);
 637
 638         return NETDEV_TX_OK;
 639 }
 640
 641 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 642                                             struct net_device *dev)
 643 {
 644         /* Just return the original SKB */
 645         return skb;
 646 }
 647
 648
 649 /* ethtool operations *******************************************************/
 650 static int
 651 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 652 {
 653         struct dsa_slave_priv *p = netdev_priv(dev);
 654         int err;
 655
 656         err = -EOPNOTSUPP;
 657         if (p->phy != NULL) {
 658                 err = phy_read_status(p->phy);
 659                 if (err == 0)
 660                         err = phy_ethtool_gset(p->phy, cmd);
 661         }
 662
 663         return err;
 664 }
 665
 666 static int
 667 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 668 {
 669         struct dsa_slave_priv *p = netdev_priv(dev);
 670
 671         if (p->phy != NULL)
 672                 return phy_ethtool_sset(p->phy, cmd);
 673
 674         return -EOPNOTSUPP;
 675 }
 676
 677 static void dsa_slave_get_drvinfo(struct net_device *dev,
 678                                   struct ethtool_drvinfo *drvinfo)
 679 {
 680         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 681         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 682         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 683         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 684 }
 685
 686 static int dsa_slave_get_regs_len(struct net_device *dev)
 687 {
 688         struct dsa_slave_priv *p = netdev_priv(dev);
 689         struct dsa_switch *ds = p->parent;
 690
 691         if (ds->drv->get_regs_len)
 692                 return ds->drv->get_regs_len(ds, p->port);
 693
 694         return -EOPNOTSUPP;
 695 }
 696
 697 static void
 698 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
 699 {
 700         struct dsa_slave_priv *p = netdev_priv(dev);
 701         struct dsa_switch *ds = p->parent;
 702
 703         if (ds->drv->get_regs)
 704                 ds->drv->get_regs(ds, p->port, regs, _p);
 705 }
 706
 707 static int dsa_slave_nway_reset(struct net_device *dev)
 708 {
 709         struct dsa_slave_priv *p = netdev_priv(dev);
 710
 711         if (p->phy != NULL)
 712                 return genphy_restart_aneg(p->phy);
 713
 714         return -EOPNOTSUPP;
 715 }
 716
 717 static u32 dsa_slave_get_link(struct net_device *dev)
 718 {
 719         struct dsa_slave_priv *p = netdev_priv(dev);
 720
 721         if (p->phy != NULL) {
 722                 genphy_update_link(p->phy);
 723                 return p->phy->link;
 724         }
 725
 726         return -EOPNOTSUPP;
 727 }
 728
 729 static int dsa_slave_get_eeprom_len(struct net_device *dev)
 730 {
 731         struct dsa_slave_priv *p = netdev_priv(dev);
 732         struct dsa_switch *ds = p->parent;
 733
 734         if (ds->pd->eeprom_len)
 735                 return ds->pd->eeprom_len;
 736
 737         if (ds->drv->get_eeprom_len)
 738                 return ds->drv->get_eeprom_len(ds);
 739
 740         return 0;
 741 }
 742
 743 static int dsa_slave_get_eeprom(struct net_device *dev,
 744                                 struct ethtool_eeprom *eeprom, u8 *data)
 745 {
 746         struct dsa_slave_priv *p = netdev_priv(dev);
 747         struct dsa_switch *ds = p->parent;
 748
 749         if (ds->drv->get_eeprom)
 750                 return ds->drv->get_eeprom(ds, eeprom, data);
 751
 752         return -EOPNOTSUPP;
 753 }
 754
 755 static int dsa_slave_set_eeprom(struct net_device *dev,
 756                                 struct ethtool_eeprom *eeprom, u8 *data)
 757 {
 758         struct dsa_slave_priv *p = netdev_priv(dev);
 759         struct dsa_switch *ds = p->parent;
 760
 761         if (ds->drv->set_eeprom)
 762                 return ds->drv->set_eeprom(ds, eeprom, data);
 763
 764         return -EOPNOTSUPP;
 765 }
 766
 767 static void dsa_slave_get_strings(struct net_device *dev,
 768                                   uint32_t stringset, uint8_t *data)
 769 {
 770         struct dsa_slave_priv *p = netdev_priv(dev);
 771         struct dsa_switch *ds = p->parent;
 772
 773         if (stringset == ETH_SS_STATS) {
 774                 int len = ETH_GSTRING_LEN;
 775
 776                 strncpy(data, "tx_packets", len);
 777                 strncpy(data + len, "tx_bytes", len);
 778                 strncpy(data + 2 * len, "rx_packets", len);
 779                 strncpy(data + 3 * len, "rx_bytes", len);
 780                 if (ds->drv->get_strings != NULL)
 781                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 782         }
 783 }
 784
 785 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 786                                         struct ethtool_stats *stats,
 787                                         uint64_t *data)
 788 {
 789         struct dsa_slave_priv *p = netdev_priv(dev);
 790         struct dsa_switch *ds = p->parent;
 791
 792         data[0] = p->dev->stats.tx_packets;
 793         data[1] = p->dev->stats.tx_bytes;
 794         data[2] = p->dev->stats.rx_packets;
 795         data[3] = p->dev->stats.rx_bytes;
 796         if (ds->drv->get_ethtool_stats != NULL)
 797                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 798 }
 799
 800 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 801 {
 802         struct dsa_slave_priv *p = netdev_priv(dev);
 803         struct dsa_switch *ds = p->parent;
 804
 805         if (sset == ETH_SS_STATS) {
 806                 int count;
 807
 808                 count = 4;
 809                 if (ds->drv->get_sset_count != NULL)
 810                         count += ds->drv->get_sset_count(ds);
 811
 812                 return count;
 813         }
 814
 815         return -EOPNOTSUPP;
 816 }
 817
 818 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 819 {
 820         struct dsa_slave_priv *p = netdev_priv(dev);
 821         struct dsa_switch *ds = p->parent;
 822
 823         if (ds->drv->get_wol)
 824                 ds->drv->get_wol(ds, p->port, w);
 825 }
 826
 827 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 828 {
 829         struct dsa_slave_priv *p = netdev_priv(dev);
 830         struct dsa_switch *ds = p->parent;
 831         int ret = -EOPNOTSUPP;
 832
 833         if (ds->drv->set_wol)
 834                 ret = ds->drv->set_wol(ds, p->port, w);
 835
 836         return ret;
 837 }
 838
 839 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 840 {
 841         struct dsa_slave_priv *p = netdev_priv(dev);
 842         struct dsa_switch *ds = p->parent;
 843         int ret;
 844
 845         if (!ds->drv->set_eee)
 846                 return -EOPNOTSUPP;
 847
 848         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 849         if (ret)
 850                 return ret;
 851
 852         if (p->phy)
 853                 ret = phy_ethtool_set_eee(p->phy, e);
 854
 855         return ret;
 856 }
 857
 858 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 859 {
 860         struct dsa_slave_priv *p = netdev_priv(dev);
 861         struct dsa_switch *ds = p->parent;
 862         int ret;
 863
 864         if (!ds->drv->get_eee)
 865                 return -EOPNOTSUPP;
 866
 867         ret = ds->drv->get_eee(ds, p->port, e);
 868         if (ret)
 869                 return ret;
 870
 871         if (p->phy)
 872                 ret = phy_ethtool_get_eee(p->phy, e);
 873
 874         return ret;
 875 }
 876
 877 #ifdef CONFIG_NET_POLL_CONTROLLER
 878 static int dsa_slave_netpoll_setup(struct net_device *dev,
 879                                    struct netpoll_info *ni)
 880 {
 881         struct dsa_slave_priv *p = netdev_priv(dev);
 882         struct dsa_switch *ds = p->parent;
 883         struct net_device *master = ds->dst->master_netdev;
 884         struct netpoll *netpoll;
 885         int err = 0;
 886
 887         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 888         if (!netpoll)
 889                 return -ENOMEM;
 890
 891         err = __netpoll_setup(netpoll, master);
 892         if (err) {
 893                 kfree(netpoll);
 894                 goto out;
 895         }
 896
 897         p->netpoll = netpoll;
 898 out:
 899         return err;
 900 }
 901
 902 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
 903 {
 904         struct dsa_slave_priv *p = netdev_priv(dev);
 905         struct netpoll *netpoll = p->netpoll;
 906
 907         if (!netpoll)
 908                 return;
 909
 910         p->netpoll = NULL;
 911
 912         __netpoll_free_async(netpoll);
 913 }
 914
 915 static void dsa_slave_poll_controller(struct net_device *dev)
 916 {
 917 }
 918 #endif
 919
 920 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 921         .get_settings           = dsa_slave_get_settings,
 922         .set_settings           = dsa_slave_set_settings,
 923         .get_drvinfo            = dsa_slave_get_drvinfo,
 924         .get_regs_len           = dsa_slave_get_regs_len,
 925         .get_regs               = dsa_slave_get_regs,
 926         .nway_reset             = dsa_slave_nway_reset,
 927         .get_link               = dsa_slave_get_link,
 928         .get_eeprom_len         = dsa_slave_get_eeprom_len,
 929         .get_eeprom             = dsa_slave_get_eeprom,
 930         .set_eeprom             = dsa_slave_set_eeprom,
 931         .get_strings            = dsa_slave_get_strings,
 932         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 933         .get_sset_count         = dsa_slave_get_sset_count,
 934         .set_wol                = dsa_slave_set_wol,
 935         .get_wol                = dsa_slave_get_wol,
 936         .set_eee                = dsa_slave_set_eee,
 937         .get_eee                = dsa_slave_get_eee,
 938 };
 939
 940 static const struct net_device_ops dsa_slave_netdev_ops = {
 941         .ndo_open               = dsa_slave_open,
 942         .ndo_stop               = dsa_slave_close,
 943         .ndo_start_xmit         = dsa_slave_xmit,
 944         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 945         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 946         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 947         .ndo_fdb_add            = switchdev_port_fdb_add,
 948         .ndo_fdb_del            = switchdev_port_fdb_del,
 949         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 950         .ndo_do_ioctl           = dsa_slave_ioctl,
 951         .ndo_get_iflink         = dsa_slave_get_iflink,
 952 #ifdef CONFIG_NET_POLL_CONTROLLER
 953         .ndo_netpoll_setup      = dsa_slave_netpoll_setup,
 954         .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
 955         .ndo_poll_controller    = dsa_slave_poll_controller,
 956 #endif
 957         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 958         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 959         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 960 };
 961
 962 static const struct switchdev_ops dsa_slave_switchdev_ops = {
 963         .switchdev_port_attr_get        = dsa_slave_port_attr_get,
 964         .switchdev_port_attr_set        = dsa_slave_port_attr_set,
 965         .switchdev_port_obj_add         = dsa_slave_port_obj_add,
 966         .switchdev_port_obj_del         = dsa_slave_port_obj_del,
 967         .switchdev_port_obj_dump        = dsa_slave_port_obj_dump,
 968 };
 969
 970 static void dsa_slave_adjust_link(struct net_device *dev)
 971 {
 972         struct dsa_slave_priv *p = netdev_priv(dev);
 973         struct dsa_switch *ds = p->parent;
 974         unsigned int status_changed = 0;
 975
 976         if (p->old_link != p->phy->link) {
 977                 status_changed = 1;
 978                 p->old_link = p->phy->link;
 979         }
 980
 981         if (p->old_duplex != p->phy->duplex) {
 982                 status_changed = 1;
 983                 p->old_duplex = p->phy->duplex;
 984         }
 985
 986         if (p->old_pause != p->phy->pause) {
 987                 status_changed = 1;
 988                 p->old_pause = p->phy->pause;
 989         }
 990
 991         if (ds->drv->adjust_link && status_changed)
 992                 ds->drv->adjust_link(ds, p->port, p->phy);
 993
 994         if (status_changed)
 995                 phy_print_status(p->phy);
 996 }
 997
 998 static int dsa_slave_fixed_link_update(struct net_device *dev,
 999                                        struct fixed_phy_status *status)
1000 {
1001         struct dsa_slave_priv *p = netdev_priv(dev);
1002         struct dsa_switch *ds = p->parent;
1003
1004         if (ds->drv->fixed_link_update)
1005                 ds->drv->fixed_link_update(ds, p->port, status);
1006
1007         return 0;
1008 }
1009
1010 /* slave device setup *******************************************************/
1011 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1012                                  struct net_device *slave_dev,
1013                                  int addr)
1014 {
1015         struct dsa_switch *ds = p->parent;
1016
1017         p->phy = ds->slave_mii_bus->phy_map[addr];
1018         if (!p->phy)
1019                 return -ENODEV;
1020
1021         /* Use already configured phy mode */
1022         if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1023                 p->phy_interface = p->phy->interface;
1024         phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1025                            p->phy_interface);
1026
1027         return 0;
1028 }
1029
1030 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1031                                 struct net_device *slave_dev)
1032 {
1033         struct dsa_switch *ds = p->parent;
1034         struct dsa_chip_data *cd = ds->pd;
1035         struct device_node *phy_dn, *port_dn;
1036         bool phy_is_fixed = false;
1037         u32 phy_flags = 0;
1038         int mode, ret;
1039
1040         port_dn = cd->port_dn[p->port];
1041         mode = of_get_phy_mode(port_dn);
1042         if (mode < 0)
1043                 mode = PHY_INTERFACE_MODE_NA;
1044         p->phy_interface = mode;
1045
1046         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1047         if (of_phy_is_fixed_link(port_dn)) {
1048                 /* In the case of a fixed PHY, the DT node associated
1049                  * to the fixed PHY is the Port DT node
1050                  */
1051                 ret = of_phy_register_fixed_link(port_dn);
1052                 if (ret) {
1053                         netdev_err(slave_dev, "failed to register fixed PHY\n");
1054                         return ret;
1055                 }
1056                 phy_is_fixed = true;
1057                 phy_dn = port_dn;
1058         }
1059
1060         if (ds->drv->get_phy_flags)
1061                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
1062
1063         if (phy_dn) {
1064                 ret = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1065                 /* If this PHY address is part of phys_mii_mask, which means
1066                  * that we need to divert reads and writes to/from it, then we
1067                  * want to bind this device using the slave MII bus created by
1068                  * DSA to make that happen.
1069                  */
1070                 if (!phy_is_fixed && ret >= 0 &&
1071                     (ds->phys_mii_mask & (1 << ret))) {
1072                         ret = dsa_slave_phy_connect(p, slave_dev, ret);
1073                         if (ret)
1074                                 return ret;
1075                 } else {
1076                         p->phy = of_phy_connect(slave_dev, phy_dn,
1077                                                 dsa_slave_adjust_link,
1078                                                 phy_flags,
1079                                                 p->phy_interface);
1080                 }
1081         }
1082
1083         if (p->phy && phy_is_fixed)
1084                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1085
1086         /* We could not connect to a designated PHY, so use the switch internal
1087          * MDIO bus instead
1088          */
1089         if (!p->phy) {
1090                 ret = dsa_slave_phy_connect(p, slave_dev, p->port);
1091                 if (ret)
1092                         return ret;
1093         } else {
1094                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
1095                             p->phy->addr, p->phy->drv->name);
1096         }
1097
1098         return 0;
1099 }
1100
1101 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1102 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1103                                             struct netdev_queue *txq,
1104                                             void *_unused)
1105 {
1106         lockdep_set_class(&txq->_xmit_lock,
1107                           &dsa_slave_netdev_xmit_lock_key);
1108 }
1109
1110 int dsa_slave_suspend(struct net_device *slave_dev)
1111 {
1112         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1113
1114         if (p->phy) {
1115                 phy_stop(p->phy);
1116                 p->old_pause = -1;
1117                 p->old_link = -1;
1118                 p->old_duplex = -1;
1119                 phy_suspend(p->phy);
1120         }
1121
1122         return 0;
1123 }
1124
1125 int dsa_slave_resume(struct net_device *slave_dev)
1126 {
1127         struct dsa_slave_priv *p = netdev_priv(slave_dev);
1128
1129         netif_device_attach(slave_dev);
1130
1131         if (p->phy) {
1132                 phy_resume(p->phy);
1133                 phy_start(p->phy);
1134         }
1135
1136         return 0;
1137 }
1138
1139 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1140                      int port, char *name)
1141 {
1142         struct net_device *master = ds->dst->master_netdev;
1143         struct net_device *slave_dev;
1144         struct dsa_slave_priv *p;
1145         int ret;
1146
1147         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1148                                  NET_NAME_UNKNOWN, ether_setup);
1149         if (slave_dev == NULL)
1150                 return -ENOMEM;
1151
1152         slave_dev->features = master->vlan_features;
1153         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1154         eth_hw_addr_inherit(slave_dev, master);
1155         slave_dev->priv_flags |= IFF_NO_QUEUE;
1156         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1157         slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1158
1159         netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1160                                  NULL);
1161
1162         SET_NETDEV_DEV(slave_dev, parent);
1163         slave_dev->dev.of_node = ds->pd->port_dn[port];
1164         slave_dev->vlan_features = master->vlan_features;
1165
1166         p = netdev_priv(slave_dev);
1167         p->dev = slave_dev;
1168         p->parent = ds;
1169         p->port = port;
1170
1171         switch (ds->dst->tag_protocol) {
1172 #ifdef CONFIG_NET_DSA_TAG_DSA
1173         case DSA_TAG_PROTO_DSA:
1174                 p->xmit = dsa_netdev_ops.xmit;
1175                 break;
1176 #endif
1177 #ifdef CONFIG_NET_DSA_TAG_EDSA
1178         case DSA_TAG_PROTO_EDSA:
1179                 p->xmit = edsa_netdev_ops.xmit;
1180                 break;
1181 #endif
1182 #ifdef CONFIG_NET_DSA_TAG_TRAILER
1183         case DSA_TAG_PROTO_TRAILER:
1184                 p->xmit = trailer_netdev_ops.xmit;
1185                 break;
1186 #endif
1187 #ifdef CONFIG_NET_DSA_TAG_BRCM
1188         case DSA_TAG_PROTO_BRCM:
1189                 p->xmit = brcm_netdev_ops.xmit;
1190                 break;
1191 #endif
1192         default:
1193                 p->xmit = dsa_slave_notag_xmit;
1194                 break;
1195         }
1196
1197         p->old_pause = -1;
1198         p->old_link = -1;
1199         p->old_duplex = -1;
1200
1201         ret = dsa_slave_phy_setup(p, slave_dev);
1202         if (ret) {
1203                 free_netdev(slave_dev);
1204                 return ret;
1205         }
1206
1207         ds->ports[port] = slave_dev;
1208         ret = register_netdev(slave_dev);
1209         if (ret) {
1210                 netdev_err(master, "error %d registering interface %s\n",
1211                            ret, slave_dev->name);
1212                 phy_disconnect(p->phy);
1213                 ds->ports[port] = NULL;
1214                 free_netdev(slave_dev);
1215                 return ret;
1216         }
1217
1218         netif_carrier_off(slave_dev);
1219
1220         return 0;
1221 }
1222
1223 static bool dsa_slave_dev_check(struct net_device *dev)
1224 {
1225         return dev->netdev_ops == &dsa_slave_netdev_ops;
1226 }
1227
1228 static int dsa_slave_master_changed(struct net_device *dev)
1229 {
1230         struct net_device *master = netdev_master_upper_dev_get(dev);
1231         struct dsa_slave_priv *p = netdev_priv(dev);
1232         int err = 0;
1233
1234         if (master && master->rtnl_link_ops &&
1235             !strcmp(master->rtnl_link_ops->kind, "bridge"))
1236                 err = dsa_slave_bridge_port_join(dev, master);
1237         else if (dsa_port_is_bridged(p))
1238                 err = dsa_slave_bridge_port_leave(dev);
1239
1240         return err;
1241 }
1242
1243 int dsa_slave_netdevice_event(struct notifier_block *unused,
1244                               unsigned long event, void *ptr)
1245 {
1246         struct net_device *dev;
1247         int err = 0;
1248
1249         switch (event) {
1250         case NETDEV_CHANGEUPPER:
1251                 dev = netdev_notifier_info_to_dev(ptr);
1252                 if (!dsa_slave_dev_check(dev))
1253                         goto out;
1254
1255                 err = dsa_slave_master_changed(dev);
1256                 if (err)
1257                         netdev_warn(dev, "failed to reflect master change\n");
1258
1259                 break;
1260         }
1261
1262 out:
1263         return NOTIFY_DONE;
1264 }