net/dsa/switch.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Handling of a single switch chip, part of a switch fabric
   4  *
   5  * Copyright (c) 2017 Savoir-faire Linux Inc.
   6  *      Vivien Didelot <vivien.didelot@savoirfairelinux.com>
   7  */
   8
   9 #include <linux/if_bridge.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/notifier.h>
  12 #include <linux/if_vlan.h>
  13 #include <net/switchdev.h>
  14
  15 #include "dsa.h"
  16 #include "netlink.h"
  17 #include "port.h"
  18 #include "switch.h"
  19 #include "tag_8021q.h"
  20 #include "trace.h"
  21 #include "user.h"
  22
  23 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
  24                                                    unsigned int ageing_time)
  25 {
  26         struct dsa_port *dp;
  27
  28         dsa_switch_for_each_port(dp, ds)
  29                 if (dp->ageing_time && dp->ageing_time < ageing_time)
  30                         ageing_time = dp->ageing_time;
  31
  32         return ageing_time;
  33 }
  34
  35 static int dsa_switch_ageing_time(struct dsa_switch *ds,
  36                                   struct dsa_notifier_ageing_time_info *info)
  37 {
  38         unsigned int ageing_time = info->ageing_time;
  39
  40         if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
  41                 return -ERANGE;
  42
  43         if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
  44                 return -ERANGE;
  45
  46         /* Program the fastest ageing time in case of multiple bridges */
  47         ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
  48
  49         if (ds->ops->set_ageing_time)
  50                 return ds->ops->set_ageing_time(ds, ageing_time);
  51
  52         return 0;
  53 }
  54
  55 static bool dsa_port_mtu_match(struct dsa_port *dp,
  56                                struct dsa_notifier_mtu_info *info)
  57 {
  58         return dp == info->dp || dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp);
  59 }
  60
  61 static int dsa_switch_mtu(struct dsa_switch *ds,
  62                           struct dsa_notifier_mtu_info *info)
  63 {
  64         struct dsa_port *dp;
  65         int ret;
  66
  67         if (!ds->ops->port_change_mtu)
  68                 return -EOPNOTSUPP;
  69
  70         dsa_switch_for_each_port(dp, ds) {
  71                 if (dsa_port_mtu_match(dp, info)) {
  72                         ret = ds->ops->port_change_mtu(ds, dp->index,
  73                                                        info->mtu);
  74                         if (ret)
  75                                 return ret;
  76                 }
  77         }
  78
  79         return 0;
  80 }
  81
  82 static int dsa_switch_bridge_join(struct dsa_switch *ds,
  83                                   struct dsa_notifier_bridge_info *info)
  84 {
  85         int err;
  86
  87         if (info->dp->ds == ds) {
  88                 if (!ds->ops->port_bridge_join)
  89                         return -EOPNOTSUPP;
  90
  91                 err = ds->ops->port_bridge_join(ds, info->dp->index,
  92                                                 info->bridge,
  93                                                 &info->tx_fwd_offload,
  94                                                 info->extack);
  95                 if (err)
  96                         return err;
  97         }
  98
  99         if (info->dp->ds != ds && ds->ops->crosschip_bridge_join) {
 100                 err = ds->ops->crosschip_bridge_join(ds,
 101                                                      info->dp->ds->dst->index,
 102                                                      info->dp->ds->index,
 103                                                      info->dp->index,
 104                                                      info->bridge,
 105                                                      info->extack);
 106                 if (err)
 107                         return err;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static int dsa_switch_bridge_leave(struct dsa_switch *ds,
 114                                    struct dsa_notifier_bridge_info *info)
 115 {
 116         if (info->dp->ds == ds && ds->ops->port_bridge_leave)
 117                 ds->ops->port_bridge_leave(ds, info->dp->index, info->bridge);
 118
 119         if (info->dp->ds != ds && ds->ops->crosschip_bridge_leave)
 120                 ds->ops->crosschip_bridge_leave(ds, info->dp->ds->dst->index,
 121                                                 info->dp->ds->index,
 122                                                 info->dp->index,
 123                                                 info->bridge);
 124
 125         return 0;
 126 }
 127
 128 /* Matches for all upstream-facing ports (the CPU port and all upstream-facing
 129  * DSA links) that sit between the targeted port on which the notifier was
 130  * emitted and its dedicated CPU port.
 131  */
 132 static bool dsa_port_host_address_match(struct dsa_port *dp,
 133                                         const struct dsa_port *targeted_dp)
 134 {
 135         struct dsa_port *cpu_dp = targeted_dp->cpu_dp;
 136
 137         if (dsa_switch_is_upstream_of(dp->ds, targeted_dp->ds))
 138                 return dp->index == dsa_towards_port(dp->ds, cpu_dp->ds->index,
 139                                                      cpu_dp->index);
 140
 141         return false;
 142 }
 143
 144 static struct dsa_mac_addr *dsa_mac_addr_find(struct list_head *addr_list,
 145                                               const unsigned char *addr, u16 vid,
 146                                               struct dsa_db db)
 147 {
 148         struct dsa_mac_addr *a;
 149
 150         list_for_each_entry(a, addr_list, list)
 151                 if (ether_addr_equal(a->addr, addr) && a->vid == vid &&
 152                     dsa_db_equal(&a->db, &db))
 153                         return a;
 154
 155         return NULL;
 156 }
 157
 158 static int dsa_port_do_mdb_add(struct dsa_port *dp,
 159                                const struct switchdev_obj_port_mdb *mdb,
 160                                struct dsa_db db)
 161 {
 162         struct dsa_switch *ds = dp->ds;
 163         struct dsa_mac_addr *a;
 164         int port = dp->index;
 165         int err = 0;
 166
 167         /* No need to bother with refcounting for user ports */
 168         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 169                 err = ds->ops->port_mdb_add(ds, port, mdb, db);
 170                 trace_dsa_mdb_add_hw(dp, mdb->addr, mdb->vid, &db, err);
 171
 172                 return err;
 173         }
 174
 175         mutex_lock(&dp->addr_lists_lock);
 176
 177         a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid, db);
 178         if (a) {
 179                 refcount_inc(&a->refcount);
 180                 trace_dsa_mdb_add_bump(dp, mdb->addr, mdb->vid, &db,
 181                                        &a->refcount);
 182                 goto out;
 183         }
 184
 185         a = kzalloc(sizeof(*a), GFP_KERNEL);
 186         if (!a) {
 187                 err = -ENOMEM;
 188                 goto out;
 189         }
 190
 191         err = ds->ops->port_mdb_add(ds, port, mdb, db);
 192         trace_dsa_mdb_add_hw(dp, mdb->addr, mdb->vid, &db, err);
 193         if (err) {
 194                 kfree(a);
 195                 goto out;
 196         }
 197
 198         ether_addr_copy(a->addr, mdb->addr);
 199         a->vid = mdb->vid;
 200         a->db = db;
 201         refcount_set(&a->refcount, 1);
 202         list_add_tail(&a->list, &dp->mdbs);
 203
 204 out:
 205         mutex_unlock(&dp->addr_lists_lock);
 206
 207         return err;
 208 }
 209
 210 static int dsa_port_do_mdb_del(struct dsa_port *dp,
 211                                const struct switchdev_obj_port_mdb *mdb,
 212                                struct dsa_db db)
 213 {
 214         struct dsa_switch *ds = dp->ds;
 215         struct dsa_mac_addr *a;
 216         int port = dp->index;
 217         int err = 0;
 218
 219         /* No need to bother with refcounting for user ports */
 220         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 221                 err = ds->ops->port_mdb_del(ds, port, mdb, db);
 222                 trace_dsa_mdb_del_hw(dp, mdb->addr, mdb->vid, &db, err);
 223
 224                 return err;
 225         }
 226
 227         mutex_lock(&dp->addr_lists_lock);
 228
 229         a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid, db);
 230         if (!a) {
 231                 trace_dsa_mdb_del_not_found(dp, mdb->addr, mdb->vid, &db);
 232                 err = -ENOENT;
 233                 goto out;
 234         }
 235
 236         if (!refcount_dec_and_test(&a->refcount)) {
 237                 trace_dsa_mdb_del_drop(dp, mdb->addr, mdb->vid, &db,
 238                                        &a->refcount);
 239                 goto out;
 240         }
 241
 242         err = ds->ops->port_mdb_del(ds, port, mdb, db);
 243         trace_dsa_mdb_del_hw(dp, mdb->addr, mdb->vid, &db, err);
 244         if (err) {
 245                 refcount_set(&a->refcount, 1);
 246                 goto out;
 247         }
 248
 249         list_del(&a->list);
 250         kfree(a);
 251
 252 out:
 253         mutex_unlock(&dp->addr_lists_lock);
 254
 255         return err;
 256 }
 257
 258 static int dsa_port_do_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 259                                u16 vid, struct dsa_db db)
 260 {
 261         struct dsa_switch *ds = dp->ds;
 262         struct dsa_mac_addr *a;
 263         int port = dp->index;
 264         int err = 0;
 265
 266         /* No need to bother with refcounting for user ports */
 267         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 268                 err = ds->ops->port_fdb_add(ds, port, addr, vid, db);
 269                 trace_dsa_fdb_add_hw(dp, addr, vid, &db, err);
 270
 271                 return err;
 272         }
 273
 274         mutex_lock(&dp->addr_lists_lock);
 275
 276         a = dsa_mac_addr_find(&dp->fdbs, addr, vid, db);
 277         if (a) {
 278                 refcount_inc(&a->refcount);
 279                 trace_dsa_fdb_add_bump(dp, addr, vid, &db, &a->refcount);
 280                 goto out;
 281         }
 282
 283         a = kzalloc(sizeof(*a), GFP_KERNEL);
 284         if (!a) {
 285                 err = -ENOMEM;
 286                 goto out;
 287         }
 288
 289         err = ds->ops->port_fdb_add(ds, port, addr, vid, db);
 290         trace_dsa_fdb_add_hw(dp, addr, vid, &db, err);
 291         if (err) {
 292                 kfree(a);
 293                 goto out;
 294         }
 295
 296         ether_addr_copy(a->addr, addr);
 297         a->vid = vid;
 298         a->db = db;
 299         refcount_set(&a->refcount, 1);
 300         list_add_tail(&a->list, &dp->fdbs);
 301
 302 out:
 303         mutex_unlock(&dp->addr_lists_lock);
 304
 305         return err;
 306 }
 307
 308 static int dsa_port_do_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 309                                u16 vid, struct dsa_db db)
 310 {
 311         struct dsa_switch *ds = dp->ds;
 312         struct dsa_mac_addr *a;
 313         int port = dp->index;
 314         int err = 0;
 315
 316         /* No need to bother with refcounting for user ports */
 317         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 318                 err = ds->ops->port_fdb_del(ds, port, addr, vid, db);
 319                 trace_dsa_fdb_del_hw(dp, addr, vid, &db, err);
 320
 321                 return err;
 322         }
 323
 324         mutex_lock(&dp->addr_lists_lock);
 325
 326         a = dsa_mac_addr_find(&dp->fdbs, addr, vid, db);
 327         if (!a) {
 328                 trace_dsa_fdb_del_not_found(dp, addr, vid, &db);
 329                 err = -ENOENT;
 330                 goto out;
 331         }
 332
 333         if (!refcount_dec_and_test(&a->refcount)) {
 334                 trace_dsa_fdb_del_drop(dp, addr, vid, &db, &a->refcount);
 335                 goto out;
 336         }
 337
 338         err = ds->ops->port_fdb_del(ds, port, addr, vid, db);
 339         trace_dsa_fdb_del_hw(dp, addr, vid, &db, err);
 340         if (err) {
 341                 refcount_set(&a->refcount, 1);
 342                 goto out;
 343         }
 344
 345         list_del(&a->list);
 346         kfree(a);
 347
 348 out:
 349         mutex_unlock(&dp->addr_lists_lock);
 350
 351         return err;
 352 }
 353
 354 static int dsa_switch_do_lag_fdb_add(struct dsa_switch *ds, struct dsa_lag *lag,
 355                                      const unsigned char *addr, u16 vid,
 356                                      struct dsa_db db)
 357 {
 358         struct dsa_mac_addr *a;
 359         int err = 0;
 360
 361         mutex_lock(&lag->fdb_lock);
 362
 363         a = dsa_mac_addr_find(&lag->fdbs, addr, vid, db);
 364         if (a) {
 365                 refcount_inc(&a->refcount);
 366                 trace_dsa_lag_fdb_add_bump(lag->dev, addr, vid, &db,
 367                                            &a->refcount);
 368                 goto out;
 369         }
 370
 371         a = kzalloc(sizeof(*a), GFP_KERNEL);
 372         if (!a) {
 373                 err = -ENOMEM;
 374                 goto out;
 375         }
 376
 377         err = ds->ops->lag_fdb_add(ds, *lag, addr, vid, db);
 378         trace_dsa_lag_fdb_add_hw(lag->dev, addr, vid, &db, err);
 379         if (err) {
 380                 kfree(a);
 381                 goto out;
 382         }
 383
 384         ether_addr_copy(a->addr, addr);
 385         a->vid = vid;
 386         a->db = db;
 387         refcount_set(&a->refcount, 1);
 388         list_add_tail(&a->list, &lag->fdbs);
 389
 390 out:
 391         mutex_unlock(&lag->fdb_lock);
 392
 393         return err;
 394 }
 395
 396 static int dsa_switch_do_lag_fdb_del(struct dsa_switch *ds, struct dsa_lag *lag,
 397                                      const unsigned char *addr, u16 vid,
 398                                      struct dsa_db db)
 399 {
 400         struct dsa_mac_addr *a;
 401         int err = 0;
 402
 403         mutex_lock(&lag->fdb_lock);
 404
 405         a = dsa_mac_addr_find(&lag->fdbs, addr, vid, db);
 406         if (!a) {
 407                 trace_dsa_lag_fdb_del_not_found(lag->dev, addr, vid, &db);
 408                 err = -ENOENT;
 409                 goto out;
 410         }
 411
 412         if (!refcount_dec_and_test(&a->refcount)) {
 413                 trace_dsa_lag_fdb_del_drop(lag->dev, addr, vid, &db,
 414                                            &a->refcount);
 415                 goto out;
 416         }
 417
 418         err = ds->ops->lag_fdb_del(ds, *lag, addr, vid, db);
 419         trace_dsa_lag_fdb_del_hw(lag->dev, addr, vid, &db, err);
 420         if (err) {
 421                 refcount_set(&a->refcount, 1);
 422                 goto out;
 423         }
 424
 425         list_del(&a->list);
 426         kfree(a);
 427
 428 out:
 429         mutex_unlock(&lag->fdb_lock);
 430
 431         return err;
 432 }
 433
 434 static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
 435                                    struct dsa_notifier_fdb_info *info)
 436 {
 437         struct dsa_port *dp;
 438         int err = 0;
 439
 440         if (!ds->ops->port_fdb_add)
 441                 return -EOPNOTSUPP;
 442
 443         dsa_switch_for_each_port(dp, ds) {
 444                 if (dsa_port_host_address_match(dp, info->dp)) {
 445                         if (dsa_port_is_cpu(dp) && info->dp->cpu_port_in_lag) {
 446                                 err = dsa_switch_do_lag_fdb_add(ds, dp->lag,
 447                                                                 info->addr,
 448                                                                 info->vid,
 449                                                                 info->db);
 450                         } else {
 451                                 err = dsa_port_do_fdb_add(dp, info->addr,
 452                                                           info->vid, info->db);
 453                         }
 454                         if (err)
 455                                 break;
 456                 }
 457         }
 458
 459         return err;
 460 }
 461
 462 static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
 463                                    struct dsa_notifier_fdb_info *info)
 464 {
 465         struct dsa_port *dp;
 466         int err = 0;
 467
 468         if (!ds->ops->port_fdb_del)
 469                 return -EOPNOTSUPP;
 470
 471         dsa_switch_for_each_port(dp, ds) {
 472                 if (dsa_port_host_address_match(dp, info->dp)) {
 473                         if (dsa_port_is_cpu(dp) && info->dp->cpu_port_in_lag) {
 474                                 err = dsa_switch_do_lag_fdb_del(ds, dp->lag,
 475                                                                 info->addr,
 476                                                                 info->vid,
 477                                                                 info->db);
 478                         } else {
 479                                 err = dsa_port_do_fdb_del(dp, info->addr,
 480                                                           info->vid, info->db);
 481                         }
 482                         if (err)
 483                                 break;
 484                 }
 485         }
 486
 487         return err;
 488 }
 489
 490 static int dsa_switch_fdb_add(struct dsa_switch *ds,
 491                               struct dsa_notifier_fdb_info *info)
 492 {
 493         int port = dsa_towards_port(ds, info->dp->ds->index, info->dp->index);
 494         struct dsa_port *dp = dsa_to_port(ds, port);
 495
 496         if (!ds->ops->port_fdb_add)
 497                 return -EOPNOTSUPP;
 498
 499         return dsa_port_do_fdb_add(dp, info->addr, info->vid, info->db);
 500 }
 501
 502 static int dsa_switch_fdb_del(struct dsa_switch *ds,
 503                               struct dsa_notifier_fdb_info *info)
 504 {
 505         int port = dsa_towards_port(ds, info->dp->ds->index, info->dp->index);
 506         struct dsa_port *dp = dsa_to_port(ds, port);
 507
 508         if (!ds->ops->port_fdb_del)
 509                 return -EOPNOTSUPP;
 510
 511         return dsa_port_do_fdb_del(dp, info->addr, info->vid, info->db);
 512 }
 513
 514 static int dsa_switch_lag_fdb_add(struct dsa_switch *ds,
 515                                   struct dsa_notifier_lag_fdb_info *info)
 516 {
 517         struct dsa_port *dp;
 518
 519         if (!ds->ops->lag_fdb_add)
 520                 return -EOPNOTSUPP;
 521
 522         /* Notify switch only if it has a port in this LAG */
 523         dsa_switch_for_each_port(dp, ds)
 524                 if (dsa_port_offloads_lag(dp, info->lag))
 525                         return dsa_switch_do_lag_fdb_add(ds, info->lag,
 526                                                          info->addr, info->vid,
 527                                                          info->db);
 528
 529         return 0;
 530 }
 531
 532 static int dsa_switch_lag_fdb_del(struct dsa_switch *ds,
 533                                   struct dsa_notifier_lag_fdb_info *info)
 534 {
 535         struct dsa_port *dp;
 536
 537         if (!ds->ops->lag_fdb_del)
 538                 return -EOPNOTSUPP;
 539
 540         /* Notify switch only if it has a port in this LAG */
 541         dsa_switch_for_each_port(dp, ds)
 542                 if (dsa_port_offloads_lag(dp, info->lag))
 543                         return dsa_switch_do_lag_fdb_del(ds, info->lag,
 544                                                          info->addr, info->vid,
 545                                                          info->db);
 546
 547         return 0;
 548 }
 549
 550 static int dsa_switch_lag_change(struct dsa_switch *ds,
 551                                  struct dsa_notifier_lag_info *info)
 552 {
 553         if (info->dp->ds == ds && ds->ops->port_lag_change)
 554                 return ds->ops->port_lag_change(ds, info->dp->index);
 555
 556         if (info->dp->ds != ds && ds->ops->crosschip_lag_change)
 557                 return ds->ops->crosschip_lag_change(ds, info->dp->ds->index,
 558                                                      info->dp->index);
 559
 560         return 0;
 561 }
 562
 563 static int dsa_switch_lag_join(struct dsa_switch *ds,
 564                                struct dsa_notifier_lag_info *info)
 565 {
 566         if (info->dp->ds == ds && ds->ops->port_lag_join)
 567                 return ds->ops->port_lag_join(ds, info->dp->index, info->lag,
 568                                               info->info, info->extack);
 569
 570         if (info->dp->ds != ds && ds->ops->crosschip_lag_join)
 571                 return ds->ops->crosschip_lag_join(ds, info->dp->ds->index,
 572                                                    info->dp->index, info->lag,
 573                                                    info->info, info->extack);
 574
 575         return -EOPNOTSUPP;
 576 }
 577
 578 static int dsa_switch_lag_leave(struct dsa_switch *ds,
 579                                 struct dsa_notifier_lag_info *info)
 580 {
 581         if (info->dp->ds == ds && ds->ops->port_lag_leave)
 582                 return ds->ops->port_lag_leave(ds, info->dp->index, info->lag);
 583
 584         if (info->dp->ds != ds && ds->ops->crosschip_lag_leave)
 585                 return ds->ops->crosschip_lag_leave(ds, info->dp->ds->index,
 586                                                     info->dp->index, info->lag);
 587
 588         return -EOPNOTSUPP;
 589 }
 590
 591 static int dsa_switch_mdb_add(struct dsa_switch *ds,
 592                               struct dsa_notifier_mdb_info *info)
 593 {
 594         int port = dsa_towards_port(ds, info->dp->ds->index, info->dp->index);
 595         struct dsa_port *dp = dsa_to_port(ds, port);
 596
 597         if (!ds->ops->port_mdb_add)
 598                 return -EOPNOTSUPP;
 599
 600         return dsa_port_do_mdb_add(dp, info->mdb, info->db);
 601 }
 602
 603 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 604                               struct dsa_notifier_mdb_info *info)
 605 {
 606         int port = dsa_towards_port(ds, info->dp->ds->index, info->dp->index);
 607         struct dsa_port *dp = dsa_to_port(ds, port);
 608
 609         if (!ds->ops->port_mdb_del)
 610                 return -EOPNOTSUPP;
 611
 612         return dsa_port_do_mdb_del(dp, info->mdb, info->db);
 613 }
 614
 615 static int dsa_switch_host_mdb_add(struct dsa_switch *ds,
 616                                    struct dsa_notifier_mdb_info *info)
 617 {
 618         struct dsa_port *dp;
 619         int err = 0;
 620
 621         if (!ds->ops->port_mdb_add)
 622                 return -EOPNOTSUPP;
 623
 624         dsa_switch_for_each_port(dp, ds) {
 625                 if (dsa_port_host_address_match(dp, info->dp)) {
 626                         err = dsa_port_do_mdb_add(dp, info->mdb, info->db);
 627                         if (err)
 628                                 break;
 629                 }
 630         }
 631
 632         return err;
 633 }
 634
 635 static int dsa_switch_host_mdb_del(struct dsa_switch *ds,
 636                                    struct dsa_notifier_mdb_info *info)
 637 {
 638         struct dsa_port *dp;
 639         int err = 0;
 640
 641         if (!ds->ops->port_mdb_del)
 642                 return -EOPNOTSUPP;
 643
 644         dsa_switch_for_each_port(dp, ds) {
 645                 if (dsa_port_host_address_match(dp, info->dp)) {
 646                         err = dsa_port_do_mdb_del(dp, info->mdb, info->db);
 647                         if (err)
 648                                 break;
 649                 }
 650         }
 651
 652         return err;
 653 }
 654
 655 /* Port VLANs match on the targeted port and on all DSA ports */
 656 static bool dsa_port_vlan_match(struct dsa_port *dp,
 657                                 struct dsa_notifier_vlan_info *info)
 658 {
 659         return dsa_port_is_dsa(dp) || dp == info->dp;
 660 }
 661
 662 /* Host VLANs match on the targeted port's CPU port, and on all DSA ports
 663  * (upstream and downstream) of that switch and its upstream switches.
 664  */
 665 static bool dsa_port_host_vlan_match(struct dsa_port *dp,
 666                                      const struct dsa_port *targeted_dp)
 667 {
 668         struct dsa_port *cpu_dp = targeted_dp->cpu_dp;
 669
 670         if (dsa_switch_is_upstream_of(dp->ds, targeted_dp->ds))
 671                 return dsa_port_is_dsa(dp) || dp == cpu_dp;
 672
 673         return false;
 674 }
 675
 676 struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
 677                                const struct switchdev_obj_port_vlan *vlan)
 678 {
 679         struct dsa_vlan *v;
 680
 681         list_for_each_entry(v, vlan_list, list)
 682                 if (v->vid == vlan->vid)
 683                         return v;
 684
 685         return NULL;
 686 }
 687
 688 static int dsa_port_do_vlan_add(struct dsa_port *dp,
 689                                 const struct switchdev_obj_port_vlan *vlan,
 690                                 struct netlink_ext_ack *extack)
 691 {
 692         struct dsa_switch *ds = dp->ds;
 693         int port = dp->index;
 694         struct dsa_vlan *v;
 695         int err = 0;
 696
 697         /* No need to bother with refcounting for user ports. */
 698         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 699                 err = ds->ops->port_vlan_add(ds, port, vlan, extack);
 700                 trace_dsa_vlan_add_hw(dp, vlan, err);
 701
 702                 return err;
 703         }
 704
 705         /* No need to propagate on shared ports the existing VLANs that were
 706          * re-notified after just the flags have changed. This would cause a
 707          * refcount bump which we need to avoid, since it unbalances the
 708          * additions with the deletions.
 709          */
 710         if (vlan->changed)
 711                 return 0;
 712
 713         mutex_lock(&dp->vlans_lock);
 714
 715         v = dsa_vlan_find(&dp->vlans, vlan);
 716         if (v) {
 717                 refcount_inc(&v->refcount);
 718                 trace_dsa_vlan_add_bump(dp, vlan, &v->refcount);
 719                 goto out;
 720         }
 721
 722         v = kzalloc(sizeof(*v), GFP_KERNEL);
 723         if (!v) {
 724                 err = -ENOMEM;
 725                 goto out;
 726         }
 727
 728         err = ds->ops->port_vlan_add(ds, port, vlan, extack);
 729         trace_dsa_vlan_add_hw(dp, vlan, err);
 730         if (err) {
 731                 kfree(v);
 732                 goto out;
 733         }
 734
 735         v->vid = vlan->vid;
 736         refcount_set(&v->refcount, 1);
 737         list_add_tail(&v->list, &dp->vlans);
 738
 739 out:
 740         mutex_unlock(&dp->vlans_lock);
 741
 742         return err;
 743 }
 744
 745 static int dsa_port_do_vlan_del(struct dsa_port *dp,
 746                                 const struct switchdev_obj_port_vlan *vlan)
 747 {
 748         struct dsa_switch *ds = dp->ds;
 749         int port = dp->index;
 750         struct dsa_vlan *v;
 751         int err = 0;
 752
 753         /* No need to bother with refcounting for user ports */
 754         if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) {
 755                 err = ds->ops->port_vlan_del(ds, port, vlan);
 756                 trace_dsa_vlan_del_hw(dp, vlan, err);
 757
 758                 return err;
 759         }
 760
 761         mutex_lock(&dp->vlans_lock);
 762
 763         v = dsa_vlan_find(&dp->vlans, vlan);
 764         if (!v) {
 765                 trace_dsa_vlan_del_not_found(dp, vlan);
 766                 err = -ENOENT;
 767                 goto out;
 768         }
 769
 770         if (!refcount_dec_and_test(&v->refcount)) {
 771                 trace_dsa_vlan_del_drop(dp, vlan, &v->refcount);
 772                 goto out;
 773         }
 774
 775         err = ds->ops->port_vlan_del(ds, port, vlan);
 776         trace_dsa_vlan_del_hw(dp, vlan, err);
 777         if (err) {
 778                 refcount_set(&v->refcount, 1);
 779                 goto out;
 780         }
 781
 782         list_del(&v->list);
 783         kfree(v);
 784
 785 out:
 786         mutex_unlock(&dp->vlans_lock);
 787
 788         return err;
 789 }
 790
 791 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 792                                struct dsa_notifier_vlan_info *info)
 793 {
 794         struct dsa_port *dp;
 795         int err;
 796
 797         if (!ds->ops->port_vlan_add)
 798                 return -EOPNOTSUPP;
 799
 800         dsa_switch_for_each_port(dp, ds) {
 801                 if (dsa_port_vlan_match(dp, info)) {
 802                         err = dsa_port_do_vlan_add(dp, info->vlan,
 803                                                    info->extack);
 804                         if (err)
 805                                 return err;
 806                 }
 807         }
 808
 809         return 0;
 810 }
 811
 812 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 813                                struct dsa_notifier_vlan_info *info)
 814 {
 815         struct dsa_port *dp;
 816         int err;
 817
 818         if (!ds->ops->port_vlan_del)
 819                 return -EOPNOTSUPP;
 820
 821         dsa_switch_for_each_port(dp, ds) {
 822                 if (dsa_port_vlan_match(dp, info)) {
 823                         err = dsa_port_do_vlan_del(dp, info->vlan);
 824                         if (err)
 825                                 return err;
 826                 }
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int dsa_switch_host_vlan_add(struct dsa_switch *ds,
 833                                     struct dsa_notifier_vlan_info *info)
 834 {
 835         struct dsa_port *dp;
 836         int err;
 837
 838         if (!ds->ops->port_vlan_add)
 839                 return -EOPNOTSUPP;
 840
 841         dsa_switch_for_each_port(dp, ds) {
 842                 if (dsa_port_host_vlan_match(dp, info->dp)) {
 843                         err = dsa_port_do_vlan_add(dp, info->vlan,
 844                                                    info->extack);
 845                         if (err)
 846                                 return err;
 847                 }
 848         }
 849
 850         return 0;
 851 }
 852
 853 static int dsa_switch_host_vlan_del(struct dsa_switch *ds,
 854                                     struct dsa_notifier_vlan_info *info)
 855 {
 856         struct dsa_port *dp;
 857         int err;
 858
 859         if (!ds->ops->port_vlan_del)
 860                 return -EOPNOTSUPP;
 861
 862         dsa_switch_for_each_port(dp, ds) {
 863                 if (dsa_port_host_vlan_match(dp, info->dp)) {
 864                         err = dsa_port_do_vlan_del(dp, info->vlan);
 865                         if (err)
 866                                 return err;
 867                 }
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
 874                                        struct dsa_notifier_tag_proto_info *info)
 875 {
 876         const struct dsa_device_ops *tag_ops = info->tag_ops;
 877         struct dsa_port *dp, *cpu_dp;
 878         int err;
 879
 880         if (!ds->ops->change_tag_protocol)
 881                 return -EOPNOTSUPP;
 882
 883         ASSERT_RTNL();
 884
 885         err = ds->ops->change_tag_protocol(ds, tag_ops->proto);
 886         if (err)
 887                 return err;
 888
 889         dsa_switch_for_each_cpu_port(cpu_dp, ds)
 890                 dsa_port_set_tag_protocol(cpu_dp, tag_ops);
 891
 892         /* Now that changing the tag protocol can no longer fail, let's update
 893          * the remaining bits which are "duplicated for faster access", and the
 894          * bits that depend on the tagger, such as the MTU.
 895          */
 896         dsa_switch_for_each_user_port(dp, ds) {
 897                 struct net_device *user = dp->user;
 898
 899                 dsa_user_setup_tagger(user);
 900
 901                 /* rtnl_mutex is held in dsa_tree_change_tag_proto */
 902                 dsa_user_change_mtu(user, user->mtu);
 903         }
 904
 905         return 0;
 906 }
 907
 908 /* We use the same cross-chip notifiers to inform both the tagger side, as well
 909  * as the switch side, of connection and disconnection events.
 910  * Since ds->tagger_data is owned by the tagger, it isn't a hard error if the
 911  * switch side doesn't support connecting to this tagger, and therefore, the
 912  * fact that we don't disconnect the tagger side doesn't constitute a memory
 913  * leak: the tagger will still operate with persistent per-switch memory, just
 914  * with the switch side unconnected to it. What does constitute a hard error is
 915  * when the switch side supports connecting but fails.
 916  */
 917 static int
 918 dsa_switch_connect_tag_proto(struct dsa_switch *ds,
 919                              struct dsa_notifier_tag_proto_info *info)
 920 {
 921         const struct dsa_device_ops *tag_ops = info->tag_ops;
 922         int err;
 923
 924         /* Notify the new tagger about the connection to this switch */
 925         if (tag_ops->connect) {
 926                 err = tag_ops->connect(ds);
 927                 if (err)
 928                         return err;
 929         }
 930
 931         if (!ds->ops->connect_tag_protocol)
 932                 return -EOPNOTSUPP;
 933
 934         /* Notify the switch about the connection to the new tagger */
 935         err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
 936         if (err) {
 937                 /* Revert the new tagger's connection to this tree */
 938                 if (tag_ops->disconnect)
 939                         tag_ops->disconnect(ds);
 940                 return err;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int
 947 dsa_switch_disconnect_tag_proto(struct dsa_switch *ds,
 948                                 struct dsa_notifier_tag_proto_info *info)
 949 {
 950         const struct dsa_device_ops *tag_ops = info->tag_ops;
 951
 952         /* Notify the tagger about the disconnection from this switch */
 953         if (tag_ops->disconnect && ds->tagger_data)
 954                 tag_ops->disconnect(ds);
 955
 956         /* No need to notify the switch, since it shouldn't have any
 957          * resources to tear down
 958          */
 959         return 0;
 960 }
 961
 962 static int
 963 dsa_switch_conduit_state_change(struct dsa_switch *ds,
 964                                 struct dsa_notifier_conduit_state_info *info)
 965 {
 966         if (!ds->ops->conduit_state_change)
 967                 return 0;
 968
 969         ds->ops->conduit_state_change(ds, info->conduit, info->operational);
 970
 971         return 0;
 972 }
 973
 974 static int dsa_switch_event(struct notifier_block *nb,
 975                             unsigned long event, void *info)
 976 {
 977         struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 978         int err;
 979
 980         switch (event) {
 981         case DSA_NOTIFIER_AGEING_TIME:
 982                 err = dsa_switch_ageing_time(ds, info);
 983                 break;
 984         case DSA_NOTIFIER_BRIDGE_JOIN:
 985                 err = dsa_switch_bridge_join(ds, info);
 986                 break;
 987         case DSA_NOTIFIER_BRIDGE_LEAVE:
 988                 err = dsa_switch_bridge_leave(ds, info);
 989                 break;
 990         case DSA_NOTIFIER_FDB_ADD:
 991                 err = dsa_switch_fdb_add(ds, info);
 992                 break;
 993         case DSA_NOTIFIER_FDB_DEL:
 994                 err = dsa_switch_fdb_del(ds, info);
 995                 break;
 996         case DSA_NOTIFIER_HOST_FDB_ADD:
 997                 err = dsa_switch_host_fdb_add(ds, info);
 998                 break;
 999         case DSA_NOTIFIER_HOST_FDB_DEL:
1000                 err = dsa_switch_host_fdb_del(ds, info);
1001                 break;
1002         case DSA_NOTIFIER_LAG_FDB_ADD:
1003                 err = dsa_switch_lag_fdb_add(ds, info);
1004                 break;
1005         case DSA_NOTIFIER_LAG_FDB_DEL:
1006                 err = dsa_switch_lag_fdb_del(ds, info);
1007                 break;
1008         case DSA_NOTIFIER_LAG_CHANGE:
1009                 err = dsa_switch_lag_change(ds, info);
1010                 break;
1011         case DSA_NOTIFIER_LAG_JOIN:
1012                 err = dsa_switch_lag_join(ds, info);
1013                 break;
1014         case DSA_NOTIFIER_LAG_LEAVE:
1015                 err = dsa_switch_lag_leave(ds, info);
1016                 break;
1017         case DSA_NOTIFIER_MDB_ADD:
1018                 err = dsa_switch_mdb_add(ds, info);
1019                 break;
1020         case DSA_NOTIFIER_MDB_DEL:
1021                 err = dsa_switch_mdb_del(ds, info);
1022                 break;
1023         case DSA_NOTIFIER_HOST_MDB_ADD:
1024                 err = dsa_switch_host_mdb_add(ds, info);
1025                 break;
1026         case DSA_NOTIFIER_HOST_MDB_DEL:
1027                 err = dsa_switch_host_mdb_del(ds, info);
1028                 break;
1029         case DSA_NOTIFIER_VLAN_ADD:
1030                 err = dsa_switch_vlan_add(ds, info);
1031                 break;
1032         case DSA_NOTIFIER_VLAN_DEL:
1033                 err = dsa_switch_vlan_del(ds, info);
1034                 break;
1035         case DSA_NOTIFIER_HOST_VLAN_ADD:
1036                 err = dsa_switch_host_vlan_add(ds, info);
1037                 break;
1038         case DSA_NOTIFIER_HOST_VLAN_DEL:
1039                 err = dsa_switch_host_vlan_del(ds, info);
1040                 break;
1041         case DSA_NOTIFIER_MTU:
1042                 err = dsa_switch_mtu(ds, info);
1043                 break;
1044         case DSA_NOTIFIER_TAG_PROTO:
1045                 err = dsa_switch_change_tag_proto(ds, info);
1046                 break;
1047         case DSA_NOTIFIER_TAG_PROTO_CONNECT:
1048                 err = dsa_switch_connect_tag_proto(ds, info);
1049                 break;
1050         case DSA_NOTIFIER_TAG_PROTO_DISCONNECT:
1051                 err = dsa_switch_disconnect_tag_proto(ds, info);
1052                 break;
1053         case DSA_NOTIFIER_TAG_8021Q_VLAN_ADD:
1054                 err = dsa_switch_tag_8021q_vlan_add(ds, info);
1055                 break;
1056         case DSA_NOTIFIER_TAG_8021Q_VLAN_DEL:
1057                 err = dsa_switch_tag_8021q_vlan_del(ds, info);
1058                 break;
1059         case DSA_NOTIFIER_CONDUIT_STATE_CHANGE:
1060                 err = dsa_switch_conduit_state_change(ds, info);
1061                 break;
1062         default:
1063                 err = -EOPNOTSUPP;
1064                 break;
1065         }
1066
1067         if (err)
1068                 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
1069                         event, err);
1070
1071         return notifier_from_errno(err);
1072 }
1073
1074 /**
1075  * dsa_tree_notify - Execute code for all switches in a DSA switch tree.
1076  * @dst: collection of struct dsa_switch devices to notify.
1077  * @e: event, must be of type DSA_NOTIFIER_*
1078  * @v: event-specific value.
1079  *
1080  * Given a struct dsa_switch_tree, this can be used to run a function once for
1081  * each member DSA switch. The other alternative of traversing the tree is only
1082  * through its ports list, which does not uniquely list the switches.
1083  */
1084 int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v)
1085 {
1086         struct raw_notifier_head *nh = &dst->nh;
1087         int err;
1088
1089         err = raw_notifier_call_chain(nh, e, v);
1090
1091         return notifier_to_errno(err);
1092 }
1093
1094 /**
1095  * dsa_broadcast - Notify all DSA trees in the system.
1096  * @e: event, must be of type DSA_NOTIFIER_*
1097  * @v: event-specific value.
1098  *
1099  * Can be used to notify the switching fabric of events such as cross-chip
1100  * bridging between disjoint trees (such as islands of tagger-compatible
1101  * switches bridged by an incompatible middle switch).
1102  *
1103  * WARNING: this function is not reliable during probe time, because probing
1104  * between trees is asynchronous and not all DSA trees might have probed.
1105  */
1106 int dsa_broadcast(unsigned long e, void *v)
1107 {
1108         struct dsa_switch_tree *dst;
1109         int err = 0;
1110
1111         list_for_each_entry(dst, &dsa_tree_list, list) {
1112                 err = dsa_tree_notify(dst, e, v);
1113                 if (err)
1114                         break;
1115         }
1116
1117         return err;
1118 }
1119
1120 int dsa_switch_register_notifier(struct dsa_switch *ds)
1121 {
1122         ds->nb.notifier_call = dsa_switch_event;
1123
1124         return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
1125 }
1126
1127 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
1128 {
1129         int err;
1130
1131         err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
1132         if (err)
1133                 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
1134 }