1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Handling of a single switch port 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/notifier.h> 11 #include <linux/of_mdio.h> 12 #include <linux/of_net.h> 13 14 #include "dsa_priv.h" 15 16 static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v) 17 { 18 struct raw_notifier_head *nh = &dp->ds->dst->nh; 19 int err; 20 21 err = raw_notifier_call_chain(nh, e, v); 22 23 return notifier_to_errno(err); 24 } 25 26 int dsa_port_set_state(struct dsa_port *dp, u8 state, 27 struct switchdev_trans *trans) 28 { 29 struct dsa_switch *ds = dp->ds; 30 int port = dp->index; 31 32 if (switchdev_trans_ph_prepare(trans)) 33 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP; 34 35 if (ds->ops->port_stp_state_set) 36 ds->ops->port_stp_state_set(ds, port, state); 37 38 if (ds->ops->port_fast_age) { 39 /* Fast age FDB entries or flush appropriate forwarding database 40 * for the given port, if we are moving it from Learning or 41 * Forwarding state, to Disabled or Blocking or Listening state. 42 */ 43 44 if ((dp->stp_state == BR_STATE_LEARNING || 45 dp->stp_state == BR_STATE_FORWARDING) && 46 (state == BR_STATE_DISABLED || 47 state == BR_STATE_BLOCKING || 48 state == BR_STATE_LISTENING)) 49 ds->ops->port_fast_age(ds, port); 50 } 51 52 dp->stp_state = state; 53 54 return 0; 55 } 56 57 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state) 58 { 59 int err; 60 61 err = dsa_port_set_state(dp, state, NULL); 62 if (err) 63 pr_err("DSA: failed to set STP state %u (%d)\n", state, err); 64 } 65 66 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy) 67 { 68 struct dsa_switch *ds = dp->ds; 69 int port = dp->index; 70 int err; 71 72 if (ds->ops->port_enable) { 73 err = ds->ops->port_enable(ds, port, phy); 74 if (err) 75 return err; 76 } 77 78 if (!dp->bridge_dev) 79 dsa_port_set_state_now(dp, BR_STATE_FORWARDING); 80 81 return 0; 82 } 83 84 void dsa_port_disable(struct dsa_port *dp) 85 { 86 struct dsa_switch *ds = dp->ds; 87 int port = dp->index; 88 89 if (!dp->bridge_dev) 90 dsa_port_set_state_now(dp, BR_STATE_DISABLED); 91 92 if (ds->ops->port_disable) 93 ds->ops->port_disable(ds, port); 94 } 95 96 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br) 97 { 98 struct dsa_notifier_bridge_info info = { 99 .sw_index = dp->ds->index, 100 .port = dp->index, 101 .br = br, 102 }; 103 int err; 104 105 /* Set the flooding mode before joining the port in the switch */ 106 err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL); 107 if (err) 108 return err; 109 110 /* Here the interface is already bridged. Reflect the current 111 * configuration so that drivers can program their chips accordingly. 112 */ 113 dp->bridge_dev = br; 114 115 err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info); 116 117 /* The bridging is rolled back on error */ 118 if (err) { 119 dsa_port_bridge_flags(dp, 0, NULL); 120 dp->bridge_dev = NULL; 121 } 122 123 return err; 124 } 125 126 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br) 127 { 128 struct dsa_notifier_bridge_info info = { 129 .sw_index = dp->ds->index, 130 .port = dp->index, 131 .br = br, 132 }; 133 int err; 134 135 /* Here the port is already unbridged. Reflect the current configuration 136 * so that drivers can program their chips accordingly. 137 */ 138 dp->bridge_dev = NULL; 139 140 err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info); 141 if (err) 142 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n"); 143 144 /* Port is leaving the bridge, disable flooding */ 145 dsa_port_bridge_flags(dp, 0, NULL); 146 147 /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer, 148 * so allow it to be in BR_STATE_FORWARDING to be kept functional 149 */ 150 dsa_port_set_state_now(dp, BR_STATE_FORWARDING); 151 } 152 153 static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp, 154 bool vlan_filtering) 155 { 156 struct dsa_switch *ds = dp->ds; 157 int i; 158 159 if (!ds->vlan_filtering_is_global) 160 return true; 161 162 /* For cases where enabling/disabling VLAN awareness is global to the 163 * switch, we need to handle the case where multiple bridges span 164 * different ports of the same switch device and one of them has a 165 * different setting than what is being requested. 166 */ 167 for (i = 0; i < ds->num_ports; i++) { 168 struct net_device *other_bridge; 169 170 other_bridge = dsa_to_port(ds, i)->bridge_dev; 171 if (!other_bridge) 172 continue; 173 /* If it's the same bridge, it also has same 174 * vlan_filtering setting => no need to check 175 */ 176 if (other_bridge == dp->bridge_dev) 177 continue; 178 if (br_vlan_enabled(other_bridge) != vlan_filtering) { 179 dev_err(ds->dev, "VLAN filtering is a global setting\n"); 180 return false; 181 } 182 } 183 return true; 184 } 185 186 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering, 187 struct switchdev_trans *trans) 188 { 189 struct dsa_switch *ds = dp->ds; 190 int err; 191 192 /* bridge skips -EOPNOTSUPP, so skip the prepare phase */ 193 if (switchdev_trans_ph_prepare(trans)) 194 return 0; 195 196 if (!ds->ops->port_vlan_filtering) 197 return 0; 198 199 if (!dsa_port_can_apply_vlan_filtering(dp, vlan_filtering)) 200 return -EINVAL; 201 202 if (dsa_port_is_vlan_filtering(dp) == vlan_filtering) 203 return 0; 204 205 err = ds->ops->port_vlan_filtering(ds, dp->index, 206 vlan_filtering); 207 if (err) 208 return err; 209 210 if (ds->vlan_filtering_is_global) 211 ds->vlan_filtering = vlan_filtering; 212 else 213 dp->vlan_filtering = vlan_filtering; 214 return 0; 215 } 216 217 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock, 218 struct switchdev_trans *trans) 219 { 220 unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock); 221 unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies); 222 struct dsa_notifier_ageing_time_info info = { 223 .ageing_time = ageing_time, 224 .trans = trans, 225 }; 226 227 if (switchdev_trans_ph_prepare(trans)) 228 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info); 229 230 dp->ageing_time = ageing_time; 231 232 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info); 233 } 234 235 int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags, 236 struct switchdev_trans *trans) 237 { 238 struct dsa_switch *ds = dp->ds; 239 240 if (!ds->ops->port_egress_floods || 241 (flags & ~(BR_FLOOD | BR_MCAST_FLOOD))) 242 return -EINVAL; 243 244 return 0; 245 } 246 247 int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags, 248 struct switchdev_trans *trans) 249 { 250 struct dsa_switch *ds = dp->ds; 251 int port = dp->index; 252 int err = 0; 253 254 if (switchdev_trans_ph_prepare(trans)) 255 return 0; 256 257 if (ds->ops->port_egress_floods) 258 err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD, 259 flags & BR_MCAST_FLOOD); 260 261 return err; 262 } 263 264 int dsa_port_mrouter(struct dsa_port *dp, bool mrouter, 265 struct switchdev_trans *trans) 266 { 267 struct dsa_switch *ds = dp->ds; 268 int port = dp->index; 269 270 if (switchdev_trans_ph_prepare(trans)) 271 return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP; 272 273 return ds->ops->port_egress_floods(ds, port, true, mrouter); 274 } 275 276 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr, 277 u16 vid) 278 { 279 struct dsa_notifier_fdb_info info = { 280 .sw_index = dp->ds->index, 281 .port = dp->index, 282 .addr = addr, 283 .vid = vid, 284 }; 285 286 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info); 287 } 288 289 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr, 290 u16 vid) 291 { 292 struct dsa_notifier_fdb_info info = { 293 .sw_index = dp->ds->index, 294 .port = dp->index, 295 .addr = addr, 296 .vid = vid, 297 298 }; 299 300 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info); 301 } 302 303 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data) 304 { 305 struct dsa_switch *ds = dp->ds; 306 int port = dp->index; 307 308 if (!ds->ops->port_fdb_dump) 309 return -EOPNOTSUPP; 310 311 return ds->ops->port_fdb_dump(ds, port, cb, data); 312 } 313 314 int dsa_port_mdb_add(const struct dsa_port *dp, 315 const struct switchdev_obj_port_mdb *mdb, 316 struct switchdev_trans *trans) 317 { 318 struct dsa_notifier_mdb_info info = { 319 .sw_index = dp->ds->index, 320 .port = dp->index, 321 .trans = trans, 322 .mdb = mdb, 323 }; 324 325 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info); 326 } 327 328 int dsa_port_mdb_del(const struct dsa_port *dp, 329 const struct switchdev_obj_port_mdb *mdb) 330 { 331 struct dsa_notifier_mdb_info info = { 332 .sw_index = dp->ds->index, 333 .port = dp->index, 334 .mdb = mdb, 335 }; 336 337 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info); 338 } 339 340 int dsa_port_vlan_add(struct dsa_port *dp, 341 const struct switchdev_obj_port_vlan *vlan, 342 struct switchdev_trans *trans) 343 { 344 struct dsa_notifier_vlan_info info = { 345 .sw_index = dp->ds->index, 346 .port = dp->index, 347 .trans = trans, 348 .vlan = vlan, 349 }; 350 351 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info); 352 } 353 354 int dsa_port_vlan_del(struct dsa_port *dp, 355 const struct switchdev_obj_port_vlan *vlan) 356 { 357 struct dsa_notifier_vlan_info info = { 358 .sw_index = dp->ds->index, 359 .port = dp->index, 360 .vlan = vlan, 361 }; 362 363 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info); 364 } 365 366 int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags) 367 { 368 struct switchdev_obj_port_vlan vlan = { 369 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, 370 .flags = flags, 371 .vid_begin = vid, 372 .vid_end = vid, 373 }; 374 struct switchdev_trans trans; 375 int err; 376 377 trans.ph_prepare = true; 378 err = dsa_port_vlan_add(dp, &vlan, &trans); 379 if (err) 380 return err; 381 382 trans.ph_prepare = false; 383 return dsa_port_vlan_add(dp, &vlan, &trans); 384 } 385 EXPORT_SYMBOL(dsa_port_vid_add); 386 387 int dsa_port_vid_del(struct dsa_port *dp, u16 vid) 388 { 389 struct switchdev_obj_port_vlan vlan = { 390 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, 391 .vid_begin = vid, 392 .vid_end = vid, 393 }; 394 395 return dsa_port_vlan_del(dp, &vlan); 396 } 397 EXPORT_SYMBOL(dsa_port_vid_del); 398 399 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp) 400 { 401 struct device_node *phy_dn; 402 struct phy_device *phydev; 403 404 phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0); 405 if (!phy_dn) 406 return NULL; 407 408 phydev = of_phy_find_device(phy_dn); 409 if (!phydev) { 410 of_node_put(phy_dn); 411 return ERR_PTR(-EPROBE_DEFER); 412 } 413 414 of_node_put(phy_dn); 415 return phydev; 416 } 417 418 void dsa_port_phylink_validate(struct phylink_config *config, 419 unsigned long *supported, 420 struct phylink_link_state *state) 421 { 422 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 423 struct dsa_switch *ds = dp->ds; 424 425 if (!ds->ops->phylink_validate) 426 return; 427 428 ds->ops->phylink_validate(ds, dp->index, supported, state); 429 } 430 EXPORT_SYMBOL_GPL(dsa_port_phylink_validate); 431 432 void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config, 433 struct phylink_link_state *state) 434 { 435 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 436 struct dsa_switch *ds = dp->ds; 437 438 /* Only called for inband modes */ 439 if (!ds->ops->phylink_mac_link_state) { 440 state->link = 0; 441 return; 442 } 443 444 if (ds->ops->phylink_mac_link_state(ds, dp->index, state) < 0) 445 state->link = 0; 446 } 447 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_pcs_get_state); 448 449 void dsa_port_phylink_mac_config(struct phylink_config *config, 450 unsigned int mode, 451 const struct phylink_link_state *state) 452 { 453 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 454 struct dsa_switch *ds = dp->ds; 455 456 if (!ds->ops->phylink_mac_config) 457 return; 458 459 ds->ops->phylink_mac_config(ds, dp->index, mode, state); 460 } 461 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_config); 462 463 void dsa_port_phylink_mac_an_restart(struct phylink_config *config) 464 { 465 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 466 struct dsa_switch *ds = dp->ds; 467 468 if (!ds->ops->phylink_mac_an_restart) 469 return; 470 471 ds->ops->phylink_mac_an_restart(ds, dp->index); 472 } 473 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_an_restart); 474 475 void dsa_port_phylink_mac_link_down(struct phylink_config *config, 476 unsigned int mode, 477 phy_interface_t interface) 478 { 479 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 480 struct phy_device *phydev = NULL; 481 struct dsa_switch *ds = dp->ds; 482 483 if (dsa_is_user_port(ds, dp->index)) 484 phydev = dp->slave->phydev; 485 486 if (!ds->ops->phylink_mac_link_down) { 487 if (ds->ops->adjust_link && phydev) 488 ds->ops->adjust_link(ds, dp->index, phydev); 489 return; 490 } 491 492 ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface); 493 } 494 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_down); 495 496 void dsa_port_phylink_mac_link_up(struct phylink_config *config, 497 unsigned int mode, 498 phy_interface_t interface, 499 struct phy_device *phydev) 500 { 501 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 502 struct dsa_switch *ds = dp->ds; 503 504 if (!ds->ops->phylink_mac_link_up) { 505 if (ds->ops->adjust_link && phydev) 506 ds->ops->adjust_link(ds, dp->index, phydev); 507 return; 508 } 509 510 ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev); 511 } 512 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_link_up); 513 514 const struct phylink_mac_ops dsa_port_phylink_mac_ops = { 515 .validate = dsa_port_phylink_validate, 516 .mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state, 517 .mac_config = dsa_port_phylink_mac_config, 518 .mac_an_restart = dsa_port_phylink_mac_an_restart, 519 .mac_link_down = dsa_port_phylink_mac_link_down, 520 .mac_link_up = dsa_port_phylink_mac_link_up, 521 }; 522 523 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable) 524 { 525 struct dsa_switch *ds = dp->ds; 526 struct phy_device *phydev; 527 int port = dp->index; 528 int err = 0; 529 530 phydev = dsa_port_get_phy_device(dp); 531 if (!phydev) 532 return 0; 533 534 if (IS_ERR(phydev)) 535 return PTR_ERR(phydev); 536 537 if (enable) { 538 err = genphy_resume(phydev); 539 if (err < 0) 540 goto err_put_dev; 541 542 err = genphy_read_status(phydev); 543 if (err < 0) 544 goto err_put_dev; 545 } else { 546 err = genphy_suspend(phydev); 547 if (err < 0) 548 goto err_put_dev; 549 } 550 551 if (ds->ops->adjust_link) 552 ds->ops->adjust_link(ds, port, phydev); 553 554 dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev)); 555 556 err_put_dev: 557 put_device(&phydev->mdio.dev); 558 return err; 559 } 560 561 static int dsa_port_fixed_link_register_of(struct dsa_port *dp) 562 { 563 struct device_node *dn = dp->dn; 564 struct dsa_switch *ds = dp->ds; 565 struct phy_device *phydev; 566 int port = dp->index; 567 phy_interface_t mode; 568 int err; 569 570 err = of_phy_register_fixed_link(dn); 571 if (err) { 572 dev_err(ds->dev, 573 "failed to register the fixed PHY of port %d\n", 574 port); 575 return err; 576 } 577 578 phydev = of_phy_find_device(dn); 579 580 err = of_get_phy_mode(dn, &mode); 581 if (err) 582 mode = PHY_INTERFACE_MODE_NA; 583 phydev->interface = mode; 584 585 genphy_read_status(phydev); 586 587 if (ds->ops->adjust_link) 588 ds->ops->adjust_link(ds, port, phydev); 589 590 put_device(&phydev->mdio.dev); 591 592 return 0; 593 } 594 595 static int dsa_port_phylink_register(struct dsa_port *dp) 596 { 597 struct dsa_switch *ds = dp->ds; 598 struct device_node *port_dn = dp->dn; 599 phy_interface_t mode; 600 int err; 601 602 err = of_get_phy_mode(port_dn, &mode); 603 if (err) 604 mode = PHY_INTERFACE_MODE_NA; 605 606 dp->pl_config.dev = ds->dev; 607 dp->pl_config.type = PHYLINK_DEV; 608 609 dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), 610 mode, &dsa_port_phylink_mac_ops); 611 if (IS_ERR(dp->pl)) { 612 pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl)); 613 return PTR_ERR(dp->pl); 614 } 615 616 err = phylink_of_phy_connect(dp->pl, port_dn, 0); 617 if (err && err != -ENODEV) { 618 pr_err("could not attach to PHY: %d\n", err); 619 goto err_phy_connect; 620 } 621 622 rtnl_lock(); 623 phylink_start(dp->pl); 624 rtnl_unlock(); 625 626 return 0; 627 628 err_phy_connect: 629 phylink_destroy(dp->pl); 630 return err; 631 } 632 633 int dsa_port_link_register_of(struct dsa_port *dp) 634 { 635 struct dsa_switch *ds = dp->ds; 636 637 if (!ds->ops->adjust_link) 638 return dsa_port_phylink_register(dp); 639 640 dev_warn(ds->dev, 641 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n"); 642 643 if (of_phy_is_fixed_link(dp->dn)) 644 return dsa_port_fixed_link_register_of(dp); 645 else 646 return dsa_port_setup_phy_of(dp, true); 647 } 648 649 void dsa_port_link_unregister_of(struct dsa_port *dp) 650 { 651 struct dsa_switch *ds = dp->ds; 652 653 if (!ds->ops->adjust_link) { 654 rtnl_lock(); 655 phylink_disconnect_phy(dp->pl); 656 rtnl_unlock(); 657 phylink_destroy(dp->pl); 658 return; 659 } 660 661 if (of_phy_is_fixed_link(dp->dn)) 662 of_phy_deregister_fixed_link(dp->dn); 663 else 664 dsa_port_setup_phy_of(dp, false); 665 } 666 667 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data) 668 { 669 struct phy_device *phydev; 670 int ret = -EOPNOTSUPP; 671 672 if (of_phy_is_fixed_link(dp->dn)) 673 return ret; 674 675 phydev = dsa_port_get_phy_device(dp); 676 if (IS_ERR_OR_NULL(phydev)) 677 return ret; 678 679 ret = phy_ethtool_get_strings(phydev, data); 680 put_device(&phydev->mdio.dev); 681 682 return ret; 683 } 684 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings); 685 686 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data) 687 { 688 struct phy_device *phydev; 689 int ret = -EOPNOTSUPP; 690 691 if (of_phy_is_fixed_link(dp->dn)) 692 return ret; 693 694 phydev = dsa_port_get_phy_device(dp); 695 if (IS_ERR_OR_NULL(phydev)) 696 return ret; 697 698 ret = phy_ethtool_get_stats(phydev, NULL, data); 699 put_device(&phydev->mdio.dev); 700 701 return ret; 702 } 703 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats); 704 705 int dsa_port_get_phy_sset_count(struct dsa_port *dp) 706 { 707 struct phy_device *phydev; 708 int ret = -EOPNOTSUPP; 709 710 if (of_phy_is_fixed_link(dp->dn)) 711 return ret; 712 713 phydev = dsa_port_get_phy_device(dp); 714 if (IS_ERR_OR_NULL(phydev)) 715 return ret; 716 717 ret = phy_ethtool_get_sset_count(phydev); 718 put_device(&phydev->mdio.dev); 719 720 return ret; 721 } 722 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count); 723