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_priv.h" 16 17 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds, 18 unsigned int ageing_time) 19 { 20 int i; 21 22 for (i = 0; i < ds->num_ports; ++i) { 23 struct dsa_port *dp = dsa_to_port(ds, i); 24 25 if (dp->ageing_time && dp->ageing_time < ageing_time) 26 ageing_time = dp->ageing_time; 27 } 28 29 return ageing_time; 30 } 31 32 static int dsa_switch_ageing_time(struct dsa_switch *ds, 33 struct dsa_notifier_ageing_time_info *info) 34 { 35 unsigned int ageing_time = info->ageing_time; 36 37 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min) 38 return -ERANGE; 39 40 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max) 41 return -ERANGE; 42 43 /* Program the fastest ageing time in case of multiple bridges */ 44 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time); 45 46 if (ds->ops->set_ageing_time) 47 return ds->ops->set_ageing_time(ds, ageing_time); 48 49 return 0; 50 } 51 52 static bool dsa_switch_mtu_match(struct dsa_switch *ds, int port, 53 struct dsa_notifier_mtu_info *info) 54 { 55 if (ds->index == info->sw_index) 56 return (port == info->port) || dsa_is_dsa_port(ds, port); 57 58 if (!info->propagate_upstream) 59 return false; 60 61 if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port)) 62 return true; 63 64 return false; 65 } 66 67 static int dsa_switch_mtu(struct dsa_switch *ds, 68 struct dsa_notifier_mtu_info *info) 69 { 70 int port, ret; 71 72 if (!ds->ops->port_change_mtu) 73 return -EOPNOTSUPP; 74 75 for (port = 0; port < ds->num_ports; port++) { 76 if (dsa_switch_mtu_match(ds, port, info)) { 77 ret = ds->ops->port_change_mtu(ds, port, info->mtu); 78 if (ret) 79 return ret; 80 } 81 } 82 83 return 0; 84 } 85 86 static int dsa_switch_bridge_join(struct dsa_switch *ds, 87 struct dsa_notifier_bridge_info *info) 88 { 89 struct dsa_switch_tree *dst = ds->dst; 90 91 if (dst->index == info->tree_index && ds->index == info->sw_index && 92 ds->ops->port_bridge_join) 93 return ds->ops->port_bridge_join(ds, info->port, info->br); 94 95 if ((dst->index != info->tree_index || ds->index != info->sw_index) && 96 ds->ops->crosschip_bridge_join) 97 return ds->ops->crosschip_bridge_join(ds, info->tree_index, 98 info->sw_index, 99 info->port, info->br); 100 101 return 0; 102 } 103 104 static int dsa_switch_bridge_leave(struct dsa_switch *ds, 105 struct dsa_notifier_bridge_info *info) 106 { 107 bool unset_vlan_filtering = br_vlan_enabled(info->br); 108 struct dsa_switch_tree *dst = ds->dst; 109 struct netlink_ext_ack extack = {0}; 110 int err, port; 111 112 if (dst->index == info->tree_index && ds->index == info->sw_index && 113 ds->ops->port_bridge_join) 114 ds->ops->port_bridge_leave(ds, info->port, info->br); 115 116 if ((dst->index != info->tree_index || ds->index != info->sw_index) && 117 ds->ops->crosschip_bridge_join) 118 ds->ops->crosschip_bridge_leave(ds, info->tree_index, 119 info->sw_index, info->port, 120 info->br); 121 122 /* If the bridge was vlan_filtering, the bridge core doesn't trigger an 123 * event for changing vlan_filtering setting upon slave ports leaving 124 * it. That is a good thing, because that lets us handle it and also 125 * handle the case where the switch's vlan_filtering setting is global 126 * (not per port). When that happens, the correct moment to trigger the 127 * vlan_filtering callback is only when the last port leaves the last 128 * VLAN-aware bridge. 129 */ 130 if (unset_vlan_filtering && ds->vlan_filtering_is_global) { 131 for (port = 0; port < ds->num_ports; port++) { 132 struct net_device *bridge_dev; 133 134 bridge_dev = dsa_to_port(ds, port)->bridge_dev; 135 136 if (bridge_dev && br_vlan_enabled(bridge_dev)) { 137 unset_vlan_filtering = false; 138 break; 139 } 140 } 141 } 142 if (unset_vlan_filtering) { 143 err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port), 144 false, &extack); 145 if (extack._msg) 146 dev_err(ds->dev, "port %d: %s\n", info->port, 147 extack._msg); 148 if (err && err != EOPNOTSUPP) 149 return err; 150 } 151 return 0; 152 } 153 154 static int dsa_switch_fdb_add(struct dsa_switch *ds, 155 struct dsa_notifier_fdb_info *info) 156 { 157 int port = dsa_towards_port(ds, info->sw_index, info->port); 158 159 if (!ds->ops->port_fdb_add) 160 return -EOPNOTSUPP; 161 162 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid); 163 } 164 165 static int dsa_switch_fdb_del(struct dsa_switch *ds, 166 struct dsa_notifier_fdb_info *info) 167 { 168 int port = dsa_towards_port(ds, info->sw_index, info->port); 169 170 if (!ds->ops->port_fdb_del) 171 return -EOPNOTSUPP; 172 173 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid); 174 } 175 176 static int dsa_switch_hsr_join(struct dsa_switch *ds, 177 struct dsa_notifier_hsr_info *info) 178 { 179 if (ds->index == info->sw_index && ds->ops->port_hsr_join) 180 return ds->ops->port_hsr_join(ds, info->port, info->hsr); 181 182 return -EOPNOTSUPP; 183 } 184 185 static int dsa_switch_hsr_leave(struct dsa_switch *ds, 186 struct dsa_notifier_hsr_info *info) 187 { 188 if (ds->index == info->sw_index && ds->ops->port_hsr_leave) 189 return ds->ops->port_hsr_leave(ds, info->port, info->hsr); 190 191 return -EOPNOTSUPP; 192 } 193 194 static int dsa_switch_lag_change(struct dsa_switch *ds, 195 struct dsa_notifier_lag_info *info) 196 { 197 if (ds->index == info->sw_index && ds->ops->port_lag_change) 198 return ds->ops->port_lag_change(ds, info->port); 199 200 if (ds->index != info->sw_index && ds->ops->crosschip_lag_change) 201 return ds->ops->crosschip_lag_change(ds, info->sw_index, 202 info->port); 203 204 return 0; 205 } 206 207 static int dsa_switch_lag_join(struct dsa_switch *ds, 208 struct dsa_notifier_lag_info *info) 209 { 210 if (ds->index == info->sw_index && ds->ops->port_lag_join) 211 return ds->ops->port_lag_join(ds, info->port, info->lag, 212 info->info); 213 214 if (ds->index != info->sw_index && ds->ops->crosschip_lag_join) 215 return ds->ops->crosschip_lag_join(ds, info->sw_index, 216 info->port, info->lag, 217 info->info); 218 219 return 0; 220 } 221 222 static int dsa_switch_lag_leave(struct dsa_switch *ds, 223 struct dsa_notifier_lag_info *info) 224 { 225 if (ds->index == info->sw_index && ds->ops->port_lag_leave) 226 return ds->ops->port_lag_leave(ds, info->port, info->lag); 227 228 if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave) 229 return ds->ops->crosschip_lag_leave(ds, info->sw_index, 230 info->port, info->lag); 231 232 return 0; 233 } 234 235 static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port, 236 struct dsa_notifier_mdb_info *info) 237 { 238 if (ds->index == info->sw_index && port == info->port) 239 return true; 240 241 if (dsa_is_dsa_port(ds, port)) 242 return true; 243 244 return false; 245 } 246 247 static int dsa_switch_mdb_add(struct dsa_switch *ds, 248 struct dsa_notifier_mdb_info *info) 249 { 250 int err = 0; 251 int port; 252 253 if (!ds->ops->port_mdb_add) 254 return -EOPNOTSUPP; 255 256 for (port = 0; port < ds->num_ports; port++) { 257 if (dsa_switch_mdb_match(ds, port, info)) { 258 err = ds->ops->port_mdb_add(ds, port, info->mdb); 259 if (err) 260 break; 261 } 262 } 263 264 return err; 265 } 266 267 static int dsa_switch_mdb_del(struct dsa_switch *ds, 268 struct dsa_notifier_mdb_info *info) 269 { 270 if (!ds->ops->port_mdb_del) 271 return -EOPNOTSUPP; 272 273 if (ds->index == info->sw_index) 274 return ds->ops->port_mdb_del(ds, info->port, info->mdb); 275 276 return 0; 277 } 278 279 static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port, 280 struct dsa_notifier_vlan_info *info) 281 { 282 if (ds->index == info->sw_index && port == info->port) 283 return true; 284 285 if (dsa_is_dsa_port(ds, port)) 286 return true; 287 288 return false; 289 } 290 291 static int dsa_switch_vlan_add(struct dsa_switch *ds, 292 struct dsa_notifier_vlan_info *info) 293 { 294 int port, err; 295 296 if (!ds->ops->port_vlan_add) 297 return -EOPNOTSUPP; 298 299 for (port = 0; port < ds->num_ports; port++) { 300 if (dsa_switch_vlan_match(ds, port, info)) { 301 err = ds->ops->port_vlan_add(ds, port, info->vlan, 302 info->extack); 303 if (err) 304 return err; 305 } 306 } 307 308 return 0; 309 } 310 311 static int dsa_switch_vlan_del(struct dsa_switch *ds, 312 struct dsa_notifier_vlan_info *info) 313 { 314 if (!ds->ops->port_vlan_del) 315 return -EOPNOTSUPP; 316 317 if (ds->index == info->sw_index) 318 return ds->ops->port_vlan_del(ds, info->port, info->vlan); 319 320 /* Do not deprogram the DSA links as they may be used as conduit 321 * for other VLAN members in the fabric. 322 */ 323 return 0; 324 } 325 326 static bool dsa_switch_tag_proto_match(struct dsa_switch *ds, int port, 327 struct dsa_notifier_tag_proto_info *info) 328 { 329 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) 330 return true; 331 332 return false; 333 } 334 335 static int dsa_switch_change_tag_proto(struct dsa_switch *ds, 336 struct dsa_notifier_tag_proto_info *info) 337 { 338 const struct dsa_device_ops *tag_ops = info->tag_ops; 339 int port, err; 340 341 if (!ds->ops->change_tag_protocol) 342 return -EOPNOTSUPP; 343 344 ASSERT_RTNL(); 345 346 for (port = 0; port < ds->num_ports; port++) { 347 if (dsa_switch_tag_proto_match(ds, port, info)) { 348 err = ds->ops->change_tag_protocol(ds, port, 349 tag_ops->proto); 350 if (err) 351 return err; 352 353 if (dsa_is_cpu_port(ds, port)) 354 dsa_port_set_tag_protocol(dsa_to_port(ds, port), 355 tag_ops); 356 } 357 } 358 359 /* Now that changing the tag protocol can no longer fail, let's update 360 * the remaining bits which are "duplicated for faster access", and the 361 * bits that depend on the tagger, such as the MTU. 362 */ 363 for (port = 0; port < ds->num_ports; port++) { 364 if (dsa_is_user_port(ds, port)) { 365 struct net_device *slave; 366 367 slave = dsa_to_port(ds, port)->slave; 368 dsa_slave_setup_tagger(slave); 369 370 /* rtnl_mutex is held in dsa_tree_change_tag_proto */ 371 dsa_slave_change_mtu(slave, slave->mtu); 372 } 373 } 374 375 return 0; 376 } 377 378 static bool dsa_switch_mrp_match(struct dsa_switch *ds, int port, 379 struct dsa_notifier_mrp_info *info) 380 { 381 if (ds->index == info->sw_index && port == info->port) 382 return true; 383 384 if (dsa_is_dsa_port(ds, port)) 385 return true; 386 387 return false; 388 } 389 390 static int dsa_switch_mrp_add(struct dsa_switch *ds, 391 struct dsa_notifier_mrp_info *info) 392 { 393 int err = 0; 394 int port; 395 396 if (!ds->ops->port_mrp_add) 397 return -EOPNOTSUPP; 398 399 for (port = 0; port < ds->num_ports; port++) { 400 if (dsa_switch_mrp_match(ds, port, info)) { 401 err = ds->ops->port_mrp_add(ds, port, info->mrp); 402 if (err) 403 break; 404 } 405 } 406 407 return err; 408 } 409 410 static int dsa_switch_mrp_del(struct dsa_switch *ds, 411 struct dsa_notifier_mrp_info *info) 412 { 413 if (!ds->ops->port_mrp_del) 414 return -EOPNOTSUPP; 415 416 if (ds->index == info->sw_index) 417 return ds->ops->port_mrp_del(ds, info->port, info->mrp); 418 419 return 0; 420 } 421 422 static bool 423 dsa_switch_mrp_ring_role_match(struct dsa_switch *ds, int port, 424 struct dsa_notifier_mrp_ring_role_info *info) 425 { 426 if (ds->index == info->sw_index && port == info->port) 427 return true; 428 429 if (dsa_is_dsa_port(ds, port)) 430 return true; 431 432 return false; 433 } 434 435 static int 436 dsa_switch_mrp_add_ring_role(struct dsa_switch *ds, 437 struct dsa_notifier_mrp_ring_role_info *info) 438 { 439 int err = 0; 440 int port; 441 442 if (!ds->ops->port_mrp_add) 443 return -EOPNOTSUPP; 444 445 for (port = 0; port < ds->num_ports; port++) { 446 if (dsa_switch_mrp_ring_role_match(ds, port, info)) { 447 err = ds->ops->port_mrp_add_ring_role(ds, port, 448 info->mrp); 449 if (err) 450 break; 451 } 452 } 453 454 return err; 455 } 456 457 static int 458 dsa_switch_mrp_del_ring_role(struct dsa_switch *ds, 459 struct dsa_notifier_mrp_ring_role_info *info) 460 { 461 if (!ds->ops->port_mrp_del) 462 return -EOPNOTSUPP; 463 464 if (ds->index == info->sw_index) 465 return ds->ops->port_mrp_del_ring_role(ds, info->port, 466 info->mrp); 467 468 return 0; 469 } 470 471 static int dsa_switch_event(struct notifier_block *nb, 472 unsigned long event, void *info) 473 { 474 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); 475 int err; 476 477 switch (event) { 478 case DSA_NOTIFIER_AGEING_TIME: 479 err = dsa_switch_ageing_time(ds, info); 480 break; 481 case DSA_NOTIFIER_BRIDGE_JOIN: 482 err = dsa_switch_bridge_join(ds, info); 483 break; 484 case DSA_NOTIFIER_BRIDGE_LEAVE: 485 err = dsa_switch_bridge_leave(ds, info); 486 break; 487 case DSA_NOTIFIER_FDB_ADD: 488 err = dsa_switch_fdb_add(ds, info); 489 break; 490 case DSA_NOTIFIER_FDB_DEL: 491 err = dsa_switch_fdb_del(ds, info); 492 break; 493 case DSA_NOTIFIER_HSR_JOIN: 494 err = dsa_switch_hsr_join(ds, info); 495 break; 496 case DSA_NOTIFIER_HSR_LEAVE: 497 err = dsa_switch_hsr_leave(ds, info); 498 break; 499 case DSA_NOTIFIER_LAG_CHANGE: 500 err = dsa_switch_lag_change(ds, info); 501 break; 502 case DSA_NOTIFIER_LAG_JOIN: 503 err = dsa_switch_lag_join(ds, info); 504 break; 505 case DSA_NOTIFIER_LAG_LEAVE: 506 err = dsa_switch_lag_leave(ds, info); 507 break; 508 case DSA_NOTIFIER_MDB_ADD: 509 err = dsa_switch_mdb_add(ds, info); 510 break; 511 case DSA_NOTIFIER_MDB_DEL: 512 err = dsa_switch_mdb_del(ds, info); 513 break; 514 case DSA_NOTIFIER_VLAN_ADD: 515 err = dsa_switch_vlan_add(ds, info); 516 break; 517 case DSA_NOTIFIER_VLAN_DEL: 518 err = dsa_switch_vlan_del(ds, info); 519 break; 520 case DSA_NOTIFIER_MTU: 521 err = dsa_switch_mtu(ds, info); 522 break; 523 case DSA_NOTIFIER_TAG_PROTO: 524 err = dsa_switch_change_tag_proto(ds, info); 525 break; 526 case DSA_NOTIFIER_MRP_ADD: 527 err = dsa_switch_mrp_add(ds, info); 528 break; 529 case DSA_NOTIFIER_MRP_DEL: 530 err = dsa_switch_mrp_del(ds, info); 531 break; 532 case DSA_NOTIFIER_MRP_ADD_RING_ROLE: 533 err = dsa_switch_mrp_add_ring_role(ds, info); 534 break; 535 case DSA_NOTIFIER_MRP_DEL_RING_ROLE: 536 err = dsa_switch_mrp_del_ring_role(ds, info); 537 break; 538 default: 539 err = -EOPNOTSUPP; 540 break; 541 } 542 543 if (err) 544 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", 545 event, err); 546 547 return notifier_from_errno(err); 548 } 549 550 int dsa_switch_register_notifier(struct dsa_switch *ds) 551 { 552 ds->nb.notifier_call = dsa_switch_event; 553 554 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); 555 } 556 557 void dsa_switch_unregister_notifier(struct dsa_switch *ds) 558 { 559 int err; 560 561 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); 562 if (err) 563 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); 564 } 565