net/dsa/dsa2.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/dsa/dsa2.c - Hardware switch handling, binding version 2
   4  * Copyright (c) 2008-2009 Marvell Semiconductor
   5  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
   6  * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/list.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/slab.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/of.h>
  16 #include <linux/of_net.h>
  17 #include <net/devlink.h>
  18
  19 #include "dsa_priv.h"
  20
  21 static DEFINE_MUTEX(dsa2_mutex);
  22 LIST_HEAD(dsa_tree_list);
  23
  24 struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
  25 {
  26         struct dsa_switch_tree *dst;
  27         struct dsa_port *dp;
  28
  29         list_for_each_entry(dst, &dsa_tree_list, list) {
  30                 if (dst->index != tree_index)
  31                         continue;
  32
  33                 list_for_each_entry(dp, &dst->ports, list) {
  34                         if (dp->ds->index != sw_index)
  35                                 continue;
  36
  37                         return dp->ds;
  38                 }
  39         }
  40
  41         return NULL;
  42 }
  43 EXPORT_SYMBOL_GPL(dsa_switch_find);
  44
  45 static struct dsa_switch_tree *dsa_tree_find(int index)
  46 {
  47         struct dsa_switch_tree *dst;
  48
  49         list_for_each_entry(dst, &dsa_tree_list, list)
  50                 if (dst->index == index)
  51                         return dst;
  52
  53         return NULL;
  54 }
  55
  56 static struct dsa_switch_tree *dsa_tree_alloc(int index)
  57 {
  58         struct dsa_switch_tree *dst;
  59
  60         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
  61         if (!dst)
  62                 return NULL;
  63
  64         dst->index = index;
  65
  66         INIT_LIST_HEAD(&dst->rtable);
  67
  68         INIT_LIST_HEAD(&dst->ports);
  69
  70         INIT_LIST_HEAD(&dst->list);
  71         list_add_tail(&dst->list, &dsa_tree_list);
  72
  73         kref_init(&dst->refcount);
  74
  75         return dst;
  76 }
  77
  78 static void dsa_tree_free(struct dsa_switch_tree *dst)
  79 {
  80         list_del(&dst->list);
  81         kfree(dst);
  82 }
  83
  84 static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
  85 {
  86         if (dst)
  87                 kref_get(&dst->refcount);
  88
  89         return dst;
  90 }
  91
  92 static struct dsa_switch_tree *dsa_tree_touch(int index)
  93 {
  94         struct dsa_switch_tree *dst;
  95
  96         dst = dsa_tree_find(index);
  97         if (dst)
  98                 return dsa_tree_get(dst);
  99         else
 100                 return dsa_tree_alloc(index);
 101 }
 102
 103 static void dsa_tree_release(struct kref *ref)
 104 {
 105         struct dsa_switch_tree *dst;
 106
 107         dst = container_of(ref, struct dsa_switch_tree, refcount);
 108
 109         dsa_tree_free(dst);
 110 }
 111
 112 static void dsa_tree_put(struct dsa_switch_tree *dst)
 113 {
 114         if (dst)
 115                 kref_put(&dst->refcount, dsa_tree_release);
 116 }
 117
 118 static bool dsa_port_is_dsa(struct dsa_port *port)
 119 {
 120         return port->type == DSA_PORT_TYPE_DSA;
 121 }
 122
 123 static bool dsa_port_is_cpu(struct dsa_port *port)
 124 {
 125         return port->type == DSA_PORT_TYPE_CPU;
 126 }
 127
 128 static bool dsa_port_is_user(struct dsa_port *dp)
 129 {
 130         return dp->type == DSA_PORT_TYPE_USER;
 131 }
 132
 133 static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
 134                                                    struct device_node *dn)
 135 {
 136         struct dsa_port *dp;
 137
 138         list_for_each_entry(dp, &dst->ports, list)
 139                 if (dp->dn == dn)
 140                         return dp;
 141
 142         return NULL;
 143 }
 144
 145 static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
 146                                        struct dsa_port *link_dp)
 147 {
 148         struct dsa_switch *ds = dp->ds;
 149         struct dsa_switch_tree *dst;
 150         struct dsa_link *dl;
 151
 152         dst = ds->dst;
 153
 154         list_for_each_entry(dl, &dst->rtable, list)
 155                 if (dl->dp == dp && dl->link_dp == link_dp)
 156                         return dl;
 157
 158         dl = kzalloc(sizeof(*dl), GFP_KERNEL);
 159         if (!dl)
 160                 return NULL;
 161
 162         dl->dp = dp;
 163         dl->link_dp = link_dp;
 164
 165         INIT_LIST_HEAD(&dl->list);
 166         list_add_tail(&dl->list, &dst->rtable);
 167
 168         return dl;
 169 }
 170
 171 static bool dsa_port_setup_routing_table(struct dsa_port *dp)
 172 {
 173         struct dsa_switch *ds = dp->ds;
 174         struct dsa_switch_tree *dst = ds->dst;
 175         struct device_node *dn = dp->dn;
 176         struct of_phandle_iterator it;
 177         struct dsa_port *link_dp;
 178         struct dsa_link *dl;
 179         int err;
 180
 181         of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
 182                 link_dp = dsa_tree_find_port_by_node(dst, it.node);
 183                 if (!link_dp) {
 184                         of_node_put(it.node);
 185                         return false;
 186                 }
 187
 188                 dl = dsa_link_touch(dp, link_dp);
 189                 if (!dl) {
 190                         of_node_put(it.node);
 191                         return false;
 192                 }
 193         }
 194
 195         return true;
 196 }
 197
 198 static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
 199 {
 200         bool complete = true;
 201         struct dsa_port *dp;
 202
 203         list_for_each_entry(dp, &dst->ports, list) {
 204                 if (dsa_port_is_dsa(dp)) {
 205                         complete = dsa_port_setup_routing_table(dp);
 206                         if (!complete)
 207                                 break;
 208                 }
 209         }
 210
 211         return complete;
 212 }
 213
 214 static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
 215 {
 216         struct dsa_port *dp;
 217
 218         list_for_each_entry(dp, &dst->ports, list)
 219                 if (dsa_port_is_cpu(dp))
 220                         return dp;
 221
 222         return NULL;
 223 }
 224
 225 static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
 226 {
 227         struct dsa_port *cpu_dp, *dp;
 228
 229         cpu_dp = dsa_tree_find_first_cpu(dst);
 230         if (!cpu_dp) {
 231                 pr_err("DSA: tree %d has no CPU port\n", dst->index);
 232                 return -EINVAL;
 233         }
 234
 235         /* Assign the default CPU port to all ports of the fabric */
 236         list_for_each_entry(dp, &dst->ports, list)
 237                 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
 238                         dp->cpu_dp = cpu_dp;
 239
 240         return 0;
 241 }
 242
 243 static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
 244 {
 245         struct dsa_port *dp;
 246
 247         list_for_each_entry(dp, &dst->ports, list)
 248                 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
 249                         dp->cpu_dp = NULL;
 250 }
 251
 252 static int dsa_port_setup(struct dsa_port *dp)
 253 {
 254         struct devlink_port *dlp = &dp->devlink_port;
 255         bool dsa_port_link_registered = false;
 256         bool dsa_port_enabled = false;
 257         int err = 0;
 258
 259         if (dp->setup)
 260                 return 0;
 261
 262         switch (dp->type) {
 263         case DSA_PORT_TYPE_UNUSED:
 264                 dsa_port_disable(dp);
 265                 break;
 266         case DSA_PORT_TYPE_CPU:
 267                 err = dsa_port_link_register_of(dp);
 268                 if (err)
 269                         break;
 270                 dsa_port_link_registered = true;
 271
 272                 err = dsa_port_enable(dp, NULL);
 273                 if (err)
 274                         break;
 275                 dsa_port_enabled = true;
 276
 277                 break;
 278         case DSA_PORT_TYPE_DSA:
 279                 err = dsa_port_link_register_of(dp);
 280                 if (err)
 281                         break;
 282                 dsa_port_link_registered = true;
 283
 284                 err = dsa_port_enable(dp, NULL);
 285                 if (err)
 286                         break;
 287                 dsa_port_enabled = true;
 288
 289                 break;
 290         case DSA_PORT_TYPE_USER:
 291                 dp->mac = of_get_mac_address(dp->dn);
 292                 err = dsa_slave_create(dp);
 293                 if (err)
 294                         break;
 295
 296                 devlink_port_type_eth_set(dlp, dp->slave);
 297                 break;
 298         }
 299
 300         if (err && dsa_port_enabled)
 301                 dsa_port_disable(dp);
 302         if (err && dsa_port_link_registered)
 303                 dsa_port_link_unregister_of(dp);
 304         if (err)
 305                 return err;
 306
 307         dp->setup = true;
 308
 309         return 0;
 310 }
 311
 312 static int dsa_port_devlink_setup(struct dsa_port *dp)
 313 {
 314         struct devlink_port *dlp = &dp->devlink_port;
 315         struct dsa_switch_tree *dst = dp->ds->dst;
 316         struct devlink_port_attrs attrs = {};
 317         struct devlink *dl = dp->ds->devlink;
 318         const unsigned char *id;
 319         unsigned char len;
 320         int err;
 321
 322         id = (const unsigned char *)&dst->index;
 323         len = sizeof(dst->index);
 324
 325         attrs.phys.port_number = dp->index;
 326         memcpy(attrs.switch_id.id, id, len);
 327         attrs.switch_id.id_len = len;
 328         memset(dlp, 0, sizeof(*dlp));
 329
 330         switch (dp->type) {
 331         case DSA_PORT_TYPE_UNUSED:
 332                 attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED;
 333                 break;
 334         case DSA_PORT_TYPE_CPU:
 335                 attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU;
 336                 break;
 337         case DSA_PORT_TYPE_DSA:
 338                 attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA;
 339                 break;
 340         case DSA_PORT_TYPE_USER:
 341                 attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
 342                 break;
 343         }
 344
 345         devlink_port_attrs_set(dlp, &attrs);
 346         err = devlink_port_register(dl, dlp, dp->index);
 347
 348         if (!err)
 349                 dp->devlink_port_setup = true;
 350
 351         return err;
 352 }
 353
 354 static void dsa_port_teardown(struct dsa_port *dp)
 355 {
 356         struct devlink_port *dlp = &dp->devlink_port;
 357
 358         if (!dp->setup)
 359                 return;
 360
 361         devlink_port_type_clear(dlp);
 362
 363         switch (dp->type) {
 364         case DSA_PORT_TYPE_UNUSED:
 365                 break;
 366         case DSA_PORT_TYPE_CPU:
 367                 dsa_port_disable(dp);
 368                 dsa_tag_driver_put(dp->tag_ops);
 369                 dsa_port_link_unregister_of(dp);
 370                 break;
 371         case DSA_PORT_TYPE_DSA:
 372                 dsa_port_disable(dp);
 373                 dsa_port_link_unregister_of(dp);
 374                 break;
 375         case DSA_PORT_TYPE_USER:
 376                 if (dp->slave) {
 377                         dsa_slave_destroy(dp->slave);
 378                         dp->slave = NULL;
 379                 }
 380                 break;
 381         }
 382
 383         dp->setup = false;
 384 }
 385
 386 static void dsa_port_devlink_teardown(struct dsa_port *dp)
 387 {
 388         struct devlink_port *dlp = &dp->devlink_port;
 389
 390         if (dp->devlink_port_setup)
 391                 devlink_port_unregister(dlp);
 392         dp->devlink_port_setup = false;
 393 }
 394
 395 static int dsa_devlink_info_get(struct devlink *dl,
 396                                 struct devlink_info_req *req,
 397                                 struct netlink_ext_ack *extack)
 398 {
 399         struct dsa_switch *ds = dsa_devlink_to_ds(dl);
 400
 401         if (ds->ops->devlink_info_get)
 402                 return ds->ops->devlink_info_get(ds, req, extack);
 403
 404         return -EOPNOTSUPP;
 405 }
 406
 407 static const struct devlink_ops dsa_devlink_ops = {
 408         .info_get = dsa_devlink_info_get,
 409 };
 410
 411 static int dsa_switch_setup(struct dsa_switch *ds)
 412 {
 413         struct dsa_devlink_priv *dl_priv;
 414         struct dsa_port *dp;
 415         int err;
 416
 417         if (ds->setup)
 418                 return 0;
 419
 420         /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
 421          * driver and before ops->setup() has run, since the switch drivers and
 422          * the slave MDIO bus driver rely on these values for probing PHY
 423          * devices or not
 424          */
 425         ds->phys_mii_mask |= dsa_user_ports(ds);
 426
 427         /* Add the switch to devlink before calling setup, so that setup can
 428          * add dpipe tables
 429          */
 430         ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
 431         if (!ds->devlink)
 432                 return -ENOMEM;
 433         dl_priv = devlink_priv(ds->devlink);
 434         dl_priv->ds = ds;
 435
 436         err = devlink_register(ds->devlink, ds->dev);
 437         if (err)
 438                 goto free_devlink;
 439
 440         /* Setup devlink port instances now, so that the switch
 441          * setup() can register regions etc, against the ports
 442          */
 443         list_for_each_entry(dp, &ds->dst->ports, list) {
 444                 if (dp->ds == ds) {
 445                         err = dsa_port_devlink_setup(dp);
 446                         if (err)
 447                                 goto unregister_devlink_ports;
 448                 }
 449         }
 450
 451         err = dsa_switch_register_notifier(ds);
 452         if (err)
 453                 goto unregister_devlink_ports;
 454
 455         err = ds->ops->setup(ds);
 456         if (err < 0)
 457                 goto unregister_notifier;
 458
 459         devlink_params_publish(ds->devlink);
 460
 461         if (!ds->slave_mii_bus && ds->ops->phy_read) {
 462                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
 463                 if (!ds->slave_mii_bus) {
 464                         err = -ENOMEM;
 465                         goto unregister_notifier;
 466                 }
 467
 468                 dsa_slave_mii_bus_init(ds);
 469
 470                 err = mdiobus_register(ds->slave_mii_bus);
 471                 if (err < 0)
 472                         goto unregister_notifier;
 473         }
 474
 475         ds->setup = true;
 476
 477         return 0;
 478
 479 unregister_notifier:
 480         dsa_switch_unregister_notifier(ds);
 481 unregister_devlink_ports:
 482         list_for_each_entry(dp, &ds->dst->ports, list)
 483                 if (dp->ds == ds)
 484                         dsa_port_devlink_teardown(dp);
 485         devlink_unregister(ds->devlink);
 486 free_devlink:
 487         devlink_free(ds->devlink);
 488         ds->devlink = NULL;
 489
 490         return err;
 491 }
 492
 493 static void dsa_switch_teardown(struct dsa_switch *ds)
 494 {
 495         struct dsa_port *dp;
 496
 497         if (!ds->setup)
 498                 return;
 499
 500         if (ds->slave_mii_bus && ds->ops->phy_read)
 501                 mdiobus_unregister(ds->slave_mii_bus);
 502
 503         dsa_switch_unregister_notifier(ds);
 504
 505         if (ds->ops->teardown)
 506                 ds->ops->teardown(ds);
 507
 508         if (ds->devlink) {
 509                 list_for_each_entry(dp, &ds->dst->ports, list)
 510                         if (dp->ds == ds)
 511                                 dsa_port_devlink_teardown(dp);
 512                 devlink_unregister(ds->devlink);
 513                 devlink_free(ds->devlink);
 514                 ds->devlink = NULL;
 515         }
 516
 517         ds->setup = false;
 518 }
 519
 520 static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
 521 {
 522         struct dsa_port *dp;
 523         int err;
 524
 525         list_for_each_entry(dp, &dst->ports, list) {
 526                 err = dsa_switch_setup(dp->ds);
 527                 if (err)
 528                         goto teardown;
 529         }
 530
 531         list_for_each_entry(dp, &dst->ports, list) {
 532                 err = dsa_port_setup(dp);
 533                 if (err)
 534                         continue;
 535         }
 536
 537         return 0;
 538
 539 teardown:
 540         list_for_each_entry(dp, &dst->ports, list)
 541                 dsa_port_teardown(dp);
 542
 543         list_for_each_entry(dp, &dst->ports, list)
 544                 dsa_switch_teardown(dp->ds);
 545
 546         return err;
 547 }
 548
 549 static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
 550 {
 551         struct dsa_port *dp;
 552
 553         list_for_each_entry(dp, &dst->ports, list)
 554                 dsa_port_teardown(dp);
 555
 556         list_for_each_entry(dp, &dst->ports, list)
 557                 dsa_switch_teardown(dp->ds);
 558 }
 559
 560 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 561 {
 562         struct dsa_port *dp;
 563         int err;
 564
 565         list_for_each_entry(dp, &dst->ports, list) {
 566                 if (dsa_port_is_cpu(dp)) {
 567                         err = dsa_master_setup(dp->master, dp);
 568                         if (err)
 569                                 return err;
 570                 }
 571         }
 572
 573         return 0;
 574 }
 575
 576 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 577 {
 578         struct dsa_port *dp;
 579
 580         list_for_each_entry(dp, &dst->ports, list)
 581                 if (dsa_port_is_cpu(dp))
 582                         dsa_master_teardown(dp->master);
 583 }
 584
 585 static int dsa_tree_setup(struct dsa_switch_tree *dst)
 586 {
 587         bool complete;
 588         int err;
 589
 590         if (dst->setup) {
 591                 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
 592                        dst->index);
 593                 return -EEXIST;
 594         }
 595
 596         complete = dsa_tree_setup_routing_table(dst);
 597         if (!complete)
 598                 return 0;
 599
 600         err = dsa_tree_setup_default_cpu(dst);
 601         if (err)
 602                 return err;
 603
 604         err = dsa_tree_setup_switches(dst);
 605         if (err)
 606                 goto teardown_default_cpu;
 607
 608         err = dsa_tree_setup_master(dst);
 609         if (err)
 610                 goto teardown_switches;
 611
 612         dst->setup = true;
 613
 614         pr_info("DSA: tree %d setup\n", dst->index);
 615
 616         return 0;
 617
 618 teardown_switches:
 619         dsa_tree_teardown_switches(dst);
 620 teardown_default_cpu:
 621         dsa_tree_teardown_default_cpu(dst);
 622
 623         return err;
 624 }
 625
 626 static void dsa_tree_teardown(struct dsa_switch_tree *dst)
 627 {
 628         struct dsa_link *dl, *next;
 629
 630         if (!dst->setup)
 631                 return;
 632
 633         dsa_tree_teardown_master(dst);
 634
 635         dsa_tree_teardown_switches(dst);
 636
 637         dsa_tree_teardown_default_cpu(dst);
 638
 639         list_for_each_entry_safe(dl, next, &dst->rtable, list) {
 640                 list_del(&dl->list);
 641                 kfree(dl);
 642         }
 643
 644         pr_info("DSA: tree %d torn down\n", dst->index);
 645
 646         dst->setup = false;
 647 }
 648
 649 static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
 650 {
 651         struct dsa_switch_tree *dst = ds->dst;
 652         struct dsa_port *dp;
 653
 654         list_for_each_entry(dp, &dst->ports, list)
 655                 if (dp->ds == ds && dp->index == index)
 656                         return dp;
 657
 658         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
 659         if (!dp)
 660                 return NULL;
 661
 662         dp->ds = ds;
 663         dp->index = index;
 664
 665         INIT_LIST_HEAD(&dp->list);
 666         list_add_tail(&dp->list, &dst->ports);
 667
 668         return dp;
 669 }
 670
 671 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
 672 {
 673         if (!name)
 674                 name = "eth%d";
 675
 676         dp->type = DSA_PORT_TYPE_USER;
 677         dp->name = name;
 678
 679         return 0;
 680 }
 681
 682 static int dsa_port_parse_dsa(struct dsa_port *dp)
 683 {
 684         dp->type = DSA_PORT_TYPE_DSA;
 685
 686         return 0;
 687 }
 688
 689 static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
 690                                                   struct net_device *master)
 691 {
 692         enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
 693         struct dsa_switch *mds, *ds = dp->ds;
 694         unsigned int mdp_upstream;
 695         struct dsa_port *mdp;
 696
 697         /* It is possible to stack DSA switches onto one another when that
 698          * happens the switch driver may want to know if its tagging protocol
 699          * is going to work in such a configuration.
 700          */
 701         if (dsa_slave_dev_check(master)) {
 702                 mdp = dsa_slave_to_port(master);
 703                 mds = mdp->ds;
 704                 mdp_upstream = dsa_upstream_port(mds, mdp->index);
 705                 tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
 706                                                           DSA_TAG_PROTO_NONE);
 707         }
 708
 709         /* If the master device is not itself a DSA slave in a disjoint DSA
 710          * tree, then return immediately.
 711          */
 712         return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
 713 }
 714
 715 static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
 716 {
 717         struct dsa_switch *ds = dp->ds;
 718         struct dsa_switch_tree *dst = ds->dst;
 719         const struct dsa_device_ops *tag_ops;
 720         enum dsa_tag_protocol tag_protocol;
 721
 722         tag_protocol = dsa_get_tag_protocol(dp, master);
 723         tag_ops = dsa_tag_driver_get(tag_protocol);
 724         if (IS_ERR(tag_ops)) {
 725                 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
 726                         return -EPROBE_DEFER;
 727                 dev_warn(ds->dev, "No tagger for this switch\n");
 728                 dp->master = NULL;
 729                 return PTR_ERR(tag_ops);
 730         }
 731
 732         dp->master = master;
 733         dp->type = DSA_PORT_TYPE_CPU;
 734         dp->filter = tag_ops->filter;
 735         dp->rcv = tag_ops->rcv;
 736         dp->tag_ops = tag_ops;
 737         dp->dst = dst;
 738
 739         return 0;
 740 }
 741
 742 static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
 743 {
 744         struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
 745         const char *name = of_get_property(dn, "label", NULL);
 746         bool link = of_property_read_bool(dn, "link");
 747
 748         dp->dn = dn;
 749
 750         if (ethernet) {
 751                 struct net_device *master;
 752
 753                 master = of_find_net_device_by_node(ethernet);
 754                 if (!master)
 755                         return -EPROBE_DEFER;
 756
 757                 return dsa_port_parse_cpu(dp, master);
 758         }
 759
 760         if (link)
 761                 return dsa_port_parse_dsa(dp);
 762
 763         return dsa_port_parse_user(dp, name);
 764 }
 765
 766 static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
 767                                      struct device_node *dn)
 768 {
 769         struct device_node *ports, *port;
 770         struct dsa_port *dp;
 771         int err = 0;
 772         u32 reg;
 773
 774         ports = of_get_child_by_name(dn, "ports");
 775         if (!ports) {
 776                 /* The second possibility is "ethernet-ports" */
 777                 ports = of_get_child_by_name(dn, "ethernet-ports");
 778                 if (!ports) {
 779                         dev_err(ds->dev, "no ports child node found\n");
 780                         return -EINVAL;
 781                 }
 782         }
 783
 784         for_each_available_child_of_node(ports, port) {
 785                 err = of_property_read_u32(port, "reg", &reg);
 786                 if (err)
 787                         goto out_put_node;
 788
 789                 if (reg >= ds->num_ports) {
 790                         err = -EINVAL;
 791                         goto out_put_node;
 792                 }
 793
 794                 dp = dsa_to_port(ds, reg);
 795
 796                 err = dsa_port_parse_of(dp, port);
 797                 if (err)
 798                         goto out_put_node;
 799         }
 800
 801 out_put_node:
 802         of_node_put(ports);
 803         return err;
 804 }
 805
 806 static int dsa_switch_parse_member_of(struct dsa_switch *ds,
 807                                       struct device_node *dn)
 808 {
 809         u32 m[2] = { 0, 0 };
 810         int sz;
 811
 812         /* Don't error out if this optional property isn't found */
 813         sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
 814         if (sz < 0 && sz != -EINVAL)
 815                 return sz;
 816
 817         ds->index = m[1];
 818
 819         ds->dst = dsa_tree_touch(m[0]);
 820         if (!ds->dst)
 821                 return -ENOMEM;
 822
 823         return 0;
 824 }
 825
 826 static int dsa_switch_touch_ports(struct dsa_switch *ds)
 827 {
 828         struct dsa_port *dp;
 829         int port;
 830
 831         for (port = 0; port < ds->num_ports; port++) {
 832                 dp = dsa_port_touch(ds, port);
 833                 if (!dp)
 834                         return -ENOMEM;
 835         }
 836
 837         return 0;
 838 }
 839
 840 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
 841 {
 842         int err;
 843
 844         err = dsa_switch_parse_member_of(ds, dn);
 845         if (err)
 846                 return err;
 847
 848         err = dsa_switch_touch_ports(ds);
 849         if (err)
 850                 return err;
 851
 852         return dsa_switch_parse_ports_of(ds, dn);
 853 }
 854
 855 static int dsa_port_parse(struct dsa_port *dp, const char *name,
 856                           struct device *dev)
 857 {
 858         if (!strcmp(name, "cpu")) {
 859                 struct net_device *master;
 860
 861                 master = dsa_dev_to_net_device(dev);
 862                 if (!master)
 863                         return -EPROBE_DEFER;
 864
 865                 dev_put(master);
 866
 867                 return dsa_port_parse_cpu(dp, master);
 868         }
 869
 870         if (!strcmp(name, "dsa"))
 871                 return dsa_port_parse_dsa(dp);
 872
 873         return dsa_port_parse_user(dp, name);
 874 }
 875
 876 static int dsa_switch_parse_ports(struct dsa_switch *ds,
 877                                   struct dsa_chip_data *cd)
 878 {
 879         bool valid_name_found = false;
 880         struct dsa_port *dp;
 881         struct device *dev;
 882         const char *name;
 883         unsigned int i;
 884         int err;
 885
 886         for (i = 0; i < DSA_MAX_PORTS; i++) {
 887                 name = cd->port_names[i];
 888                 dev = cd->netdev[i];
 889                 dp = dsa_to_port(ds, i);
 890
 891                 if (!name)
 892                         continue;
 893
 894                 err = dsa_port_parse(dp, name, dev);
 895                 if (err)
 896                         return err;
 897
 898                 valid_name_found = true;
 899         }
 900
 901         if (!valid_name_found && i == DSA_MAX_PORTS)
 902                 return -EINVAL;
 903
 904         return 0;
 905 }
 906
 907 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
 908 {
 909         int err;
 910
 911         ds->cd = cd;
 912
 913         /* We don't support interconnected switches nor multiple trees via
 914          * platform data, so this is the unique switch of the tree.
 915          */
 916         ds->index = 0;
 917         ds->dst = dsa_tree_touch(0);
 918         if (!ds->dst)
 919                 return -ENOMEM;
 920
 921         err = dsa_switch_touch_ports(ds);
 922         if (err)
 923                 return err;
 924
 925         return dsa_switch_parse_ports(ds, cd);
 926 }
 927
 928 static void dsa_switch_release_ports(struct dsa_switch *ds)
 929 {
 930         struct dsa_switch_tree *dst = ds->dst;
 931         struct dsa_port *dp, *next;
 932
 933         list_for_each_entry_safe(dp, next, &dst->ports, list) {
 934                 if (dp->ds != ds)
 935                         continue;
 936                 list_del(&dp->list);
 937                 kfree(dp);
 938         }
 939 }
 940
 941 static int dsa_switch_probe(struct dsa_switch *ds)
 942 {
 943         struct dsa_switch_tree *dst;
 944         struct dsa_chip_data *pdata;
 945         struct device_node *np;
 946         int err;
 947
 948         if (!ds->dev)
 949                 return -ENODEV;
 950
 951         pdata = ds->dev->platform_data;
 952         np = ds->dev->of_node;
 953
 954         if (!ds->num_ports)
 955                 return -EINVAL;
 956
 957         if (np) {
 958                 err = dsa_switch_parse_of(ds, np);
 959                 if (err)
 960                         dsa_switch_release_ports(ds);
 961         } else if (pdata) {
 962                 err = dsa_switch_parse(ds, pdata);
 963                 if (err)
 964                         dsa_switch_release_ports(ds);
 965         } else {
 966                 err = -ENODEV;
 967         }
 968
 969         if (err)
 970                 return err;
 971
 972         dst = ds->dst;
 973         dsa_tree_get(dst);
 974         err = dsa_tree_setup(dst);
 975         if (err) {
 976                 dsa_switch_release_ports(ds);
 977                 dsa_tree_put(dst);
 978         }
 979
 980         return err;
 981 }
 982
 983 int dsa_register_switch(struct dsa_switch *ds)
 984 {
 985         int err;
 986
 987         mutex_lock(&dsa2_mutex);
 988         err = dsa_switch_probe(ds);
 989         dsa_tree_put(ds->dst);
 990         mutex_unlock(&dsa2_mutex);
 991
 992         return err;
 993 }
 994 EXPORT_SYMBOL_GPL(dsa_register_switch);
 995
 996 static void dsa_switch_remove(struct dsa_switch *ds)
 997 {
 998         struct dsa_switch_tree *dst = ds->dst;
 999
1000         dsa_tree_teardown(dst);
1001         dsa_switch_release_ports(ds);
1002         dsa_tree_put(dst);
1003 }
1004
1005 void dsa_unregister_switch(struct dsa_switch *ds)
1006 {
1007         mutex_lock(&dsa2_mutex);
1008         dsa_switch_remove(ds);
1009         mutex_unlock(&dsa2_mutex);
1010 }
1011 EXPORT_SYMBOL_GPL(dsa_unregister_switch);