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 static 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 } 430 431 static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config, 432 struct phylink_link_state *state) 433 { 434 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 435 struct dsa_switch *ds = dp->ds; 436 437 /* Only called for inband modes */ 438 if (!ds->ops->phylink_mac_link_state) { 439 state->link = 0; 440 return; 441 } 442 443 if (ds->ops->phylink_mac_link_state(ds, dp->index, state) < 0) 444 state->link = 0; 445 } 446 447 static void dsa_port_phylink_mac_config(struct phylink_config *config, 448 unsigned int mode, 449 const struct phylink_link_state *state) 450 { 451 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 452 struct dsa_switch *ds = dp->ds; 453 454 if (!ds->ops->phylink_mac_config) 455 return; 456 457 ds->ops->phylink_mac_config(ds, dp->index, mode, state); 458 } 459 460 static void dsa_port_phylink_mac_an_restart(struct phylink_config *config) 461 { 462 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 463 struct dsa_switch *ds = dp->ds; 464 465 if (!ds->ops->phylink_mac_an_restart) 466 return; 467 468 ds->ops->phylink_mac_an_restart(ds, dp->index); 469 } 470 471 static void dsa_port_phylink_mac_link_down(struct phylink_config *config, 472 unsigned int mode, 473 phy_interface_t interface) 474 { 475 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 476 struct phy_device *phydev = NULL; 477 struct dsa_switch *ds = dp->ds; 478 479 if (dsa_is_user_port(ds, dp->index)) 480 phydev = dp->slave->phydev; 481 482 if (!ds->ops->phylink_mac_link_down) { 483 if (ds->ops->adjust_link && phydev) 484 ds->ops->adjust_link(ds, dp->index, phydev); 485 return; 486 } 487 488 ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface); 489 } 490 491 static void dsa_port_phylink_mac_link_up(struct phylink_config *config, 492 unsigned int mode, 493 phy_interface_t interface, 494 struct phy_device *phydev) 495 { 496 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); 497 struct dsa_switch *ds = dp->ds; 498 499 if (!ds->ops->phylink_mac_link_up) { 500 if (ds->ops->adjust_link && phydev) 501 ds->ops->adjust_link(ds, dp->index, phydev); 502 return; 503 } 504 505 ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev); 506 } 507 508 const struct phylink_mac_ops dsa_port_phylink_mac_ops = { 509 .validate = dsa_port_phylink_validate, 510 .mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state, 511 .mac_config = dsa_port_phylink_mac_config, 512 .mac_an_restart = dsa_port_phylink_mac_an_restart, 513 .mac_link_down = dsa_port_phylink_mac_link_down, 514 .mac_link_up = dsa_port_phylink_mac_link_up, 515 }; 516 517 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable) 518 { 519 struct dsa_switch *ds = dp->ds; 520 struct phy_device *phydev; 521 int port = dp->index; 522 int err = 0; 523 524 phydev = dsa_port_get_phy_device(dp); 525 if (!phydev) 526 return 0; 527 528 if (IS_ERR(phydev)) 529 return PTR_ERR(phydev); 530 531 if (enable) { 532 err = genphy_resume(phydev); 533 if (err < 0) 534 goto err_put_dev; 535 536 err = genphy_read_status(phydev); 537 if (err < 0) 538 goto err_put_dev; 539 } else { 540 err = genphy_suspend(phydev); 541 if (err < 0) 542 goto err_put_dev; 543 } 544 545 if (ds->ops->adjust_link) 546 ds->ops->adjust_link(ds, port, phydev); 547 548 dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev)); 549 550 err_put_dev: 551 put_device(&phydev->mdio.dev); 552 return err; 553 } 554 555 static int dsa_port_fixed_link_register_of(struct dsa_port *dp) 556 { 557 struct device_node *dn = dp->dn; 558 struct dsa_switch *ds = dp->ds; 559 struct phy_device *phydev; 560 int port = dp->index; 561 phy_interface_t mode; 562 int err; 563 564 err = of_phy_register_fixed_link(dn); 565 if (err) { 566 dev_err(ds->dev, 567 "failed to register the fixed PHY of port %d\n", 568 port); 569 return err; 570 } 571 572 phydev = of_phy_find_device(dn); 573 574 err = of_get_phy_mode(dn, &mode); 575 if (err) 576 mode = PHY_INTERFACE_MODE_NA; 577 phydev->interface = mode; 578 579 genphy_read_status(phydev); 580 581 if (ds->ops->adjust_link) 582 ds->ops->adjust_link(ds, port, phydev); 583 584 put_device(&phydev->mdio.dev); 585 586 return 0; 587 } 588 589 static int dsa_port_phylink_register(struct dsa_port *dp) 590 { 591 struct dsa_switch *ds = dp->ds; 592 struct device_node *port_dn = dp->dn; 593 phy_interface_t mode; 594 int err; 595 596 err = of_get_phy_mode(port_dn, &mode); 597 if (err) 598 mode = PHY_INTERFACE_MODE_NA; 599 600 dp->pl_config.dev = ds->dev; 601 dp->pl_config.type = PHYLINK_DEV; 602 dp->pl_config.pcs_poll = ds->pcs_poll; 603 604 dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), 605 mode, &dsa_port_phylink_mac_ops); 606 if (IS_ERR(dp->pl)) { 607 pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl)); 608 return PTR_ERR(dp->pl); 609 } 610 611 err = phylink_of_phy_connect(dp->pl, port_dn, 0); 612 if (err && err != -ENODEV) { 613 pr_err("could not attach to PHY: %d\n", err); 614 goto err_phy_connect; 615 } 616 617 rtnl_lock(); 618 phylink_start(dp->pl); 619 rtnl_unlock(); 620 621 return 0; 622 623 err_phy_connect: 624 phylink_destroy(dp->pl); 625 return err; 626 } 627 628 int dsa_port_link_register_of(struct dsa_port *dp) 629 { 630 struct dsa_switch *ds = dp->ds; 631 632 if (!ds->ops->adjust_link) 633 return dsa_port_phylink_register(dp); 634 635 dev_warn(ds->dev, 636 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n"); 637 638 if (of_phy_is_fixed_link(dp->dn)) 639 return dsa_port_fixed_link_register_of(dp); 640 else 641 return dsa_port_setup_phy_of(dp, true); 642 } 643 644 void dsa_port_link_unregister_of(struct dsa_port *dp) 645 { 646 struct dsa_switch *ds = dp->ds; 647 648 if (!ds->ops->adjust_link) { 649 rtnl_lock(); 650 phylink_disconnect_phy(dp->pl); 651 rtnl_unlock(); 652 phylink_destroy(dp->pl); 653 return; 654 } 655 656 if (of_phy_is_fixed_link(dp->dn)) 657 of_phy_deregister_fixed_link(dp->dn); 658 else 659 dsa_port_setup_phy_of(dp, false); 660 } 661 662 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data) 663 { 664 struct phy_device *phydev; 665 int ret = -EOPNOTSUPP; 666 667 if (of_phy_is_fixed_link(dp->dn)) 668 return ret; 669 670 phydev = dsa_port_get_phy_device(dp); 671 if (IS_ERR_OR_NULL(phydev)) 672 return ret; 673 674 ret = phy_ethtool_get_strings(phydev, data); 675 put_device(&phydev->mdio.dev); 676 677 return ret; 678 } 679 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings); 680 681 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data) 682 { 683 struct phy_device *phydev; 684 int ret = -EOPNOTSUPP; 685 686 if (of_phy_is_fixed_link(dp->dn)) 687 return ret; 688 689 phydev = dsa_port_get_phy_device(dp); 690 if (IS_ERR_OR_NULL(phydev)) 691 return ret; 692 693 ret = phy_ethtool_get_stats(phydev, NULL, data); 694 put_device(&phydev->mdio.dev); 695 696 return ret; 697 } 698 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats); 699 700 int dsa_port_get_phy_sset_count(struct dsa_port *dp) 701 { 702 struct phy_device *phydev; 703 int ret = -EOPNOTSUPP; 704 705 if (of_phy_is_fixed_link(dp->dn)) 706 return ret; 707 708 phydev = dsa_port_get_phy_device(dp); 709 if (IS_ERR_OR_NULL(phydev)) 710 return ret; 711 712 ret = phy_ethtool_get_sset_count(phydev); 713 put_device(&phydev->mdio.dev); 714 715 return ret; 716 } 717 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count); 718