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         if (!dp->setup)
 357                 return;
 358
 359         switch (dp->type) {
 360         case DSA_PORT_TYPE_UNUSED:
 361                 break;
 362         case DSA_PORT_TYPE_CPU:
 363                 dsa_port_disable(dp);
 364                 dsa_tag_driver_put(dp->tag_ops);
 365                 dsa_port_link_unregister_of(dp);
 366                 break;
 367         case DSA_PORT_TYPE_DSA:
 368                 dsa_port_disable(dp);
 369                 dsa_port_link_unregister_of(dp);
 370                 break;
 371         case DSA_PORT_TYPE_USER:
 372                 if (dp->slave) {
 373                         dsa_slave_destroy(dp->slave);
 374                         dp->slave = NULL;
 375                 }
 376                 break;
 377         }
 378
 379         dp->setup = false;
 380 }
 381
 382 static void dsa_port_devlink_teardown(struct dsa_port *dp)
 383 {
 384         struct devlink_port *dlp = &dp->devlink_port;
 385
 386         if (dp->devlink_port_setup)
 387                 devlink_port_unregister(dlp);
 388         dp->devlink_port_setup = false;
 389 }
 390
 391 static int dsa_devlink_info_get(struct devlink *dl,
 392                                 struct devlink_info_req *req,
 393                                 struct netlink_ext_ack *extack)
 394 {
 395         struct dsa_switch *ds = dsa_devlink_to_ds(dl);
 396
 397         if (ds->ops->devlink_info_get)
 398                 return ds->ops->devlink_info_get(ds, req, extack);
 399
 400         return -EOPNOTSUPP;
 401 }
 402
 403 static const struct devlink_ops dsa_devlink_ops = {
 404         .info_get = dsa_devlink_info_get,
 405 };
 406
 407 static int dsa_switch_setup(struct dsa_switch *ds)
 408 {
 409         struct dsa_devlink_priv *dl_priv;
 410         struct dsa_port *dp;
 411         int err;
 412
 413         if (ds->setup)
 414                 return 0;
 415
 416         /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
 417          * driver and before ops->setup() has run, since the switch drivers and
 418          * the slave MDIO bus driver rely on these values for probing PHY
 419          * devices or not
 420          */
 421         ds->phys_mii_mask |= dsa_user_ports(ds);
 422
 423         /* Add the switch to devlink before calling setup, so that setup can
 424          * add dpipe tables
 425          */
 426         ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
 427         if (!ds->devlink)
 428                 return -ENOMEM;
 429         dl_priv = devlink_priv(ds->devlink);
 430         dl_priv->ds = ds;
 431
 432         err = devlink_register(ds->devlink, ds->dev);
 433         if (err)
 434                 goto free_devlink;
 435
 436         /* Setup devlink port instances now, so that the switch
 437          * setup() can register regions etc, against the ports
 438          */
 439         list_for_each_entry(dp, &ds->dst->ports, list) {
 440                 if (dp->ds == ds) {
 441                         err = dsa_port_devlink_setup(dp);
 442                         if (err)
 443                                 goto unregister_devlink_ports;
 444                 }
 445         }
 446
 447         err = dsa_switch_register_notifier(ds);
 448         if (err)
 449                 goto unregister_devlink_ports;
 450
 451         err = ds->ops->setup(ds);
 452         if (err < 0)
 453                 goto unregister_notifier;
 454
 455         devlink_params_publish(ds->devlink);
 456
 457         if (!ds->slave_mii_bus && ds->ops->phy_read) {
 458                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
 459                 if (!ds->slave_mii_bus) {
 460                         err = -ENOMEM;
 461                         goto unregister_notifier;
 462                 }
 463
 464                 dsa_slave_mii_bus_init(ds);
 465
 466                 err = mdiobus_register(ds->slave_mii_bus);
 467                 if (err < 0)
 468                         goto unregister_notifier;
 469         }
 470
 471         ds->setup = true;
 472
 473         return 0;
 474
 475 unregister_notifier:
 476         dsa_switch_unregister_notifier(ds);
 477 unregister_devlink_ports:
 478         list_for_each_entry(dp, &ds->dst->ports, list)
 479                 if (dp->ds == ds)
 480                         dsa_port_devlink_teardown(dp);
 481         devlink_unregister(ds->devlink);
 482 free_devlink:
 483         devlink_free(ds->devlink);
 484         ds->devlink = NULL;
 485
 486         return err;
 487 }
 488
 489 static void dsa_switch_teardown(struct dsa_switch *ds)
 490 {
 491         struct dsa_port *dp;
 492
 493         if (!ds->setup)
 494                 return;
 495
 496         if (ds->slave_mii_bus && ds->ops->phy_read)
 497                 mdiobus_unregister(ds->slave_mii_bus);
 498
 499         dsa_switch_unregister_notifier(ds);
 500
 501         if (ds->ops->teardown)
 502                 ds->ops->teardown(ds);
 503
 504         if (ds->devlink) {
 505                 list_for_each_entry(dp, &ds->dst->ports, list)
 506                         if (dp->ds == ds)
 507                                 dsa_port_devlink_teardown(dp);
 508                 devlink_unregister(ds->devlink);
 509                 devlink_free(ds->devlink);
 510                 ds->devlink = NULL;
 511         }
 512
 513         ds->setup = false;
 514 }
 515
 516 static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
 517 {
 518         struct dsa_port *dp;
 519         int err;
 520
 521         list_for_each_entry(dp, &dst->ports, list) {
 522                 err = dsa_switch_setup(dp->ds);
 523                 if (err)
 524                         goto teardown;
 525         }
 526
 527         list_for_each_entry(dp, &dst->ports, list) {
 528                 err = dsa_port_setup(dp);
 529                 if (err)
 530                         continue;
 531         }
 532
 533         return 0;
 534
 535 teardown:
 536         list_for_each_entry(dp, &dst->ports, list)
 537                 dsa_port_teardown(dp);
 538
 539         list_for_each_entry(dp, &dst->ports, list)
 540                 dsa_switch_teardown(dp->ds);
 541
 542         return err;
 543 }
 544
 545 static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
 546 {
 547         struct dsa_port *dp;
 548
 549         list_for_each_entry(dp, &dst->ports, list)
 550                 dsa_port_teardown(dp);
 551
 552         list_for_each_entry(dp, &dst->ports, list)
 553                 dsa_switch_teardown(dp->ds);
 554 }
 555
 556 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 557 {
 558         struct dsa_port *dp;
 559         int err;
 560
 561         list_for_each_entry(dp, &dst->ports, list) {
 562                 if (dsa_port_is_cpu(dp)) {
 563                         err = dsa_master_setup(dp->master, dp);
 564                         if (err)
 565                                 return err;
 566                 }
 567         }
 568
 569         return 0;
 570 }
 571
 572 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 573 {
 574         struct dsa_port *dp;
 575
 576         list_for_each_entry(dp, &dst->ports, list)
 577                 if (dsa_port_is_cpu(dp))
 578                         dsa_master_teardown(dp->master);
 579 }
 580
 581 static int dsa_tree_setup(struct dsa_switch_tree *dst)
 582 {
 583         bool complete;
 584         int err;
 585
 586         if (dst->setup) {
 587                 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
 588                        dst->index);
 589                 return -EEXIST;
 590         }
 591
 592         complete = dsa_tree_setup_routing_table(dst);
 593         if (!complete)
 594                 return 0;
 595
 596         err = dsa_tree_setup_default_cpu(dst);
 597         if (err)
 598                 return err;
 599
 600         err = dsa_tree_setup_switches(dst);
 601         if (err)
 602                 goto teardown_default_cpu;
 603
 604         err = dsa_tree_setup_master(dst);
 605         if (err)
 606                 goto teardown_switches;
 607
 608         dst->setup = true;
 609
 610         pr_info("DSA: tree %d setup\n", dst->index);
 611
 612         return 0;
 613
 614 teardown_switches:
 615         dsa_tree_teardown_switches(dst);
 616 teardown_default_cpu:
 617         dsa_tree_teardown_default_cpu(dst);
 618
 619         return err;
 620 }
 621
 622 static void dsa_tree_teardown(struct dsa_switch_tree *dst)
 623 {
 624         struct dsa_link *dl, *next;
 625
 626         if (!dst->setup)
 627                 return;
 628
 629         dsa_tree_teardown_master(dst);
 630
 631         dsa_tree_teardown_switches(dst);
 632
 633         dsa_tree_teardown_default_cpu(dst);
 634
 635         list_for_each_entry_safe(dl, next, &dst->rtable, list) {
 636                 list_del(&dl->list);
 637                 kfree(dl);
 638         }
 639
 640         pr_info("DSA: tree %d torn down\n", dst->index);
 641
 642         dst->setup = false;
 643 }
 644
 645 static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
 646 {
 647         struct dsa_switch_tree *dst = ds->dst;
 648         struct dsa_port *dp;
 649
 650         list_for_each_entry(dp, &dst->ports, list)
 651                 if (dp->ds == ds && dp->index == index)
 652                         return dp;
 653
 654         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
 655         if (!dp)
 656                 return NULL;
 657
 658         dp->ds = ds;
 659         dp->index = index;
 660
 661         INIT_LIST_HEAD(&dp->list);
 662         list_add_tail(&dp->list, &dst->ports);
 663
 664         return dp;
 665 }
 666
 667 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
 668 {
 669         if (!name)
 670                 name = "eth%d";
 671
 672         dp->type = DSA_PORT_TYPE_USER;
 673         dp->name = name;
 674
 675         return 0;
 676 }
 677
 678 static int dsa_port_parse_dsa(struct dsa_port *dp)
 679 {
 680         dp->type = DSA_PORT_TYPE_DSA;
 681
 682         return 0;
 683 }
 684
 685 static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp,
 686                                                   struct net_device *master)
 687 {
 688         enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE;
 689         struct dsa_switch *mds, *ds = dp->ds;
 690         unsigned int mdp_upstream;
 691         struct dsa_port *mdp;
 692
 693         /* It is possible to stack DSA switches onto one another when that
 694          * happens the switch driver may want to know if its tagging protocol
 695          * is going to work in such a configuration.
 696          */
 697         if (dsa_slave_dev_check(master)) {
 698                 mdp = dsa_slave_to_port(master);
 699                 mds = mdp->ds;
 700                 mdp_upstream = dsa_upstream_port(mds, mdp->index);
 701                 tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream,
 702                                                           DSA_TAG_PROTO_NONE);
 703         }
 704
 705         /* If the master device is not itself a DSA slave in a disjoint DSA
 706          * tree, then return immediately.
 707          */
 708         return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol);
 709 }
 710
 711 static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
 712 {
 713         struct dsa_switch *ds = dp->ds;
 714         struct dsa_switch_tree *dst = ds->dst;
 715         const struct dsa_device_ops *tag_ops;
 716         enum dsa_tag_protocol tag_protocol;
 717
 718         tag_protocol = dsa_get_tag_protocol(dp, master);
 719         tag_ops = dsa_tag_driver_get(tag_protocol);
 720         if (IS_ERR(tag_ops)) {
 721                 if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
 722                         return -EPROBE_DEFER;
 723                 dev_warn(ds->dev, "No tagger for this switch\n");
 724                 dp->master = NULL;
 725                 return PTR_ERR(tag_ops);
 726         }
 727
 728         dp->master = master;
 729         dp->type = DSA_PORT_TYPE_CPU;
 730         dp->filter = tag_ops->filter;
 731         dp->rcv = tag_ops->rcv;
 732         dp->tag_ops = tag_ops;
 733         dp->dst = dst;
 734
 735         return 0;
 736 }
 737
 738 static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
 739 {
 740         struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
 741         const char *name = of_get_property(dn, "label", NULL);
 742         bool link = of_property_read_bool(dn, "link");
 743
 744         dp->dn = dn;
 745
 746         if (ethernet) {
 747                 struct net_device *master;
 748
 749                 master = of_find_net_device_by_node(ethernet);
 750                 if (!master)
 751                         return -EPROBE_DEFER;
 752
 753                 return dsa_port_parse_cpu(dp, master);
 754         }
 755
 756         if (link)
 757                 return dsa_port_parse_dsa(dp);
 758
 759         return dsa_port_parse_user(dp, name);
 760 }
 761
 762 static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
 763                                      struct device_node *dn)
 764 {
 765         struct device_node *ports, *port;
 766         struct dsa_port *dp;
 767         int err = 0;
 768         u32 reg;
 769
 770         ports = of_get_child_by_name(dn, "ports");
 771         if (!ports) {
 772                 /* The second possibility is "ethernet-ports" */
 773                 ports = of_get_child_by_name(dn, "ethernet-ports");
 774                 if (!ports) {
 775                         dev_err(ds->dev, "no ports child node found\n");
 776                         return -EINVAL;
 777                 }
 778         }
 779
 780         for_each_available_child_of_node(ports, port) {
 781                 err = of_property_read_u32(port, "reg", &reg);
 782                 if (err)
 783                         goto out_put_node;
 784
 785                 if (reg >= ds->num_ports) {
 786                         err = -EINVAL;
 787                         goto out_put_node;
 788                 }
 789
 790                 dp = dsa_to_port(ds, reg);
 791
 792                 err = dsa_port_parse_of(dp, port);
 793                 if (err)
 794                         goto out_put_node;
 795         }
 796
 797 out_put_node:
 798         of_node_put(ports);
 799         return err;
 800 }
 801
 802 static int dsa_switch_parse_member_of(struct dsa_switch *ds,
 803                                       struct device_node *dn)
 804 {
 805         u32 m[2] = { 0, 0 };
 806         int sz;
 807
 808         /* Don't error out if this optional property isn't found */
 809         sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
 810         if (sz < 0 && sz != -EINVAL)
 811                 return sz;
 812
 813         ds->index = m[1];
 814
 815         ds->dst = dsa_tree_touch(m[0]);
 816         if (!ds->dst)
 817                 return -ENOMEM;
 818
 819         return 0;
 820 }
 821
 822 static int dsa_switch_touch_ports(struct dsa_switch *ds)
 823 {
 824         struct dsa_port *dp;
 825         int port;
 826
 827         for (port = 0; port < ds->num_ports; port++) {
 828                 dp = dsa_port_touch(ds, port);
 829                 if (!dp)
 830                         return -ENOMEM;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
 837 {
 838         int err;
 839
 840         err = dsa_switch_parse_member_of(ds, dn);
 841         if (err)
 842                 return err;
 843
 844         err = dsa_switch_touch_ports(ds);
 845         if (err)
 846                 return err;
 847
 848         return dsa_switch_parse_ports_of(ds, dn);
 849 }
 850
 851 static int dsa_port_parse(struct dsa_port *dp, const char *name,
 852                           struct device *dev)
 853 {
 854         if (!strcmp(name, "cpu")) {
 855                 struct net_device *master;
 856
 857                 master = dsa_dev_to_net_device(dev);
 858                 if (!master)
 859                         return -EPROBE_DEFER;
 860
 861                 dev_put(master);
 862
 863                 return dsa_port_parse_cpu(dp, master);
 864         }
 865
 866         if (!strcmp(name, "dsa"))
 867                 return dsa_port_parse_dsa(dp);
 868
 869         return dsa_port_parse_user(dp, name);
 870 }
 871
 872 static int dsa_switch_parse_ports(struct dsa_switch *ds,
 873                                   struct dsa_chip_data *cd)
 874 {
 875         bool valid_name_found = false;
 876         struct dsa_port *dp;
 877         struct device *dev;
 878         const char *name;
 879         unsigned int i;
 880         int err;
 881
 882         for (i = 0; i < DSA_MAX_PORTS; i++) {
 883                 name = cd->port_names[i];
 884                 dev = cd->netdev[i];
 885                 dp = dsa_to_port(ds, i);
 886
 887                 if (!name)
 888                         continue;
 889
 890                 err = dsa_port_parse(dp, name, dev);
 891                 if (err)
 892                         return err;
 893
 894                 valid_name_found = true;
 895         }
 896
 897         if (!valid_name_found && i == DSA_MAX_PORTS)
 898                 return -EINVAL;
 899
 900         return 0;
 901 }
 902
 903 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
 904 {
 905         int err;
 906
 907         ds->cd = cd;
 908
 909         /* We don't support interconnected switches nor multiple trees via
 910          * platform data, so this is the unique switch of the tree.
 911          */
 912         ds->index = 0;
 913         ds->dst = dsa_tree_touch(0);
 914         if (!ds->dst)
 915                 return -ENOMEM;
 916
 917         err = dsa_switch_touch_ports(ds);
 918         if (err)
 919                 return err;
 920
 921         return dsa_switch_parse_ports(ds, cd);
 922 }
 923
 924 static void dsa_switch_release_ports(struct dsa_switch *ds)
 925 {
 926         struct dsa_switch_tree *dst = ds->dst;
 927         struct dsa_port *dp, *next;
 928
 929         list_for_each_entry_safe(dp, next, &dst->ports, list) {
 930                 if (dp->ds != ds)
 931                         continue;
 932                 list_del(&dp->list);
 933                 kfree(dp);
 934         }
 935 }
 936
 937 static int dsa_switch_probe(struct dsa_switch *ds)
 938 {
 939         struct dsa_switch_tree *dst;
 940         struct dsa_chip_data *pdata;
 941         struct device_node *np;
 942         int err;
 943
 944         if (!ds->dev)
 945                 return -ENODEV;
 946
 947         pdata = ds->dev->platform_data;
 948         np = ds->dev->of_node;
 949
 950         if (!ds->num_ports)
 951                 return -EINVAL;
 952
 953         if (np) {
 954                 err = dsa_switch_parse_of(ds, np);
 955                 if (err)
 956                         dsa_switch_release_ports(ds);
 957         } else if (pdata) {
 958                 err = dsa_switch_parse(ds, pdata);
 959                 if (err)
 960                         dsa_switch_release_ports(ds);
 961         } else {
 962                 err = -ENODEV;
 963         }
 964
 965         if (err)
 966                 return err;
 967
 968         dst = ds->dst;
 969         dsa_tree_get(dst);
 970         err = dsa_tree_setup(dst);
 971         if (err) {
 972                 dsa_switch_release_ports(ds);
 973                 dsa_tree_put(dst);
 974         }
 975
 976         return err;
 977 }
 978
 979 int dsa_register_switch(struct dsa_switch *ds)
 980 {
 981         int err;
 982
 983         mutex_lock(&dsa2_mutex);
 984         err = dsa_switch_probe(ds);
 985         dsa_tree_put(ds->dst);
 986         mutex_unlock(&dsa2_mutex);
 987
 988         return err;
 989 }
 990 EXPORT_SYMBOL_GPL(dsa_register_switch);
 991
 992 static void dsa_switch_remove(struct dsa_switch *ds)
 993 {
 994         struct dsa_switch_tree *dst = ds->dst;
 995
 996         dsa_tree_teardown(dst);
 997         dsa_switch_release_ports(ds);
 998         dsa_tree_put(dst);
 999 }
1000
1001 void dsa_unregister_switch(struct dsa_switch *ds)
1002 {
1003         mutex_lock(&dsa2_mutex);
1004         dsa_switch_remove(ds);
1005         mutex_unlock(&dsa2_mutex);
1006 }
1007 EXPORT_SYMBOL_GPL(dsa_unregister_switch);