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_fdb_add(struct dsa_port *dp, const unsigned char *addr, 265 u16 vid) 266 { 267 struct dsa_notifier_fdb_info info = { 268 .sw_index = dp->ds->index, 269 .port = dp->index, 270 .addr = addr, 271 .vid = vid, 272 }; 273 274 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info); 275 } 276 277 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr, 278 u16 vid) 279 { 280 struct dsa_notifier_fdb_info info = { 281 .sw_index = dp->ds->index, 282 .port = dp->index, 283 .addr = addr, 284 .vid = vid, 285 286 }; 287 288 return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info); 289 } 290 291 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data) 292 { 293 struct dsa_switch *ds = dp->ds; 294 int port = dp->index; 295 296 if (!ds->ops->port_fdb_dump) 297 return -EOPNOTSUPP; 298 299 return ds->ops->port_fdb_dump(ds, port, cb, data); 300 } 301 302 int dsa_port_mdb_add(const struct dsa_port *dp, 303 const struct switchdev_obj_port_mdb *mdb, 304 struct switchdev_trans *trans) 305 { 306 struct dsa_notifier_mdb_info info = { 307 .sw_index = dp->ds->index, 308 .port = dp->index, 309 .trans = trans, 310 .mdb = mdb, 311 }; 312 313 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info); 314 } 315 316 int dsa_port_mdb_del(const struct dsa_port *dp, 317 const struct switchdev_obj_port_mdb *mdb) 318 { 319 struct dsa_notifier_mdb_info info = { 320 .sw_index = dp->ds->index, 321 .port = dp->index, 322 .mdb = mdb, 323 }; 324 325 return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info); 326 } 327 328 int dsa_port_vlan_add(struct dsa_port *dp, 329 const struct switchdev_obj_port_vlan *vlan, 330 struct switchdev_trans *trans) 331 { 332 struct dsa_notifier_vlan_info info = { 333 .sw_index = dp->ds->index, 334 .port = dp->index, 335 .trans = trans, 336 .vlan = vlan, 337 }; 338 339 /* Can be called from dsa_slave_port_obj_add() or 340 * dsa_slave_vlan_rx_add_vid() 341 */ 342 if (!dp->bridge_dev || br_vlan_enabled(dp->bridge_dev)) 343 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info); 344 345 return 0; 346 } 347 348 int dsa_port_vlan_del(struct dsa_port *dp, 349 const struct switchdev_obj_port_vlan *vlan) 350 { 351 struct dsa_notifier_vlan_info info = { 352 .sw_index = dp->ds->index, 353 .port = dp->index, 354 .vlan = vlan, 355 }; 356 357 if (vlan->obj.orig_dev && netif_is_bridge_master(vlan->obj.orig_dev)) 358 return -EOPNOTSUPP; 359 360 /* Can be called from dsa_slave_port_obj_del() or 361 * dsa_slave_vlan_rx_kill_vid() 362 */ 363 if (!dp->bridge_dev || br_vlan_enabled(dp->bridge_dev)) 364 return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info); 365 366 return 0; 367 } 368 369 int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags) 370 { 371 struct switchdev_obj_port_vlan vlan = { 372 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, 373 .flags = flags, 374 .vid_begin = vid, 375 .vid_end = vid, 376 }; 377 struct switchdev_trans trans; 378 int err; 379 380 trans.ph_prepare = true; 381 err = dsa_port_vlan_add(dp, &vlan, &trans); 382 if (err == -EOPNOTSUPP) 383 return 0; 384 385 trans.ph_prepare = false; 386 return dsa_port_vlan_add(dp, &vlan, &trans); 387 } 388 EXPORT_SYMBOL(dsa_port_vid_add); 389 390 int dsa_port_vid_del(struct dsa_port *dp, u16 vid) 391 { 392 struct switchdev_obj_port_vlan vlan = { 393 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, 394 .vid_begin = vid, 395 .vid_end = vid, 396 }; 397 398 return dsa_port_vlan_del(dp, &vlan); 399 } 400 EXPORT_SYMBOL(dsa_port_vid_del); 401 402 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp) 403 { 404 struct device_node *phy_dn; 405 struct phy_device *phydev; 406 407 phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0); 408 if (!phy_dn) 409 return NULL; 410 411 phydev = of_phy_find_device(phy_dn); 412 if (!phydev) { 413 of_node_put(phy_dn); 414 return ERR_PTR(-EPROBE_DEFER); 415 } 416 417 of_node_put(phy_dn); 418 return phydev; 419 } 420 421 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable) 422 { 423 struct dsa_switch *ds = dp->ds; 424 struct phy_device *phydev; 425 int port = dp->index; 426 int err = 0; 427 428 phydev = dsa_port_get_phy_device(dp); 429 if (!phydev) 430 return 0; 431 432 if (IS_ERR(phydev)) 433 return PTR_ERR(phydev); 434 435 if (enable) { 436 err = genphy_config_init(phydev); 437 if (err < 0) 438 goto err_put_dev; 439 440 err = genphy_resume(phydev); 441 if (err < 0) 442 goto err_put_dev; 443 444 err = genphy_read_status(phydev); 445 if (err < 0) 446 goto err_put_dev; 447 } else { 448 err = genphy_suspend(phydev); 449 if (err < 0) 450 goto err_put_dev; 451 } 452 453 if (ds->ops->adjust_link) 454 ds->ops->adjust_link(ds, port, phydev); 455 456 dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev)); 457 458 err_put_dev: 459 put_device(&phydev->mdio.dev); 460 return err; 461 } 462 463 static int dsa_port_fixed_link_register_of(struct dsa_port *dp) 464 { 465 struct device_node *dn = dp->dn; 466 struct dsa_switch *ds = dp->ds; 467 struct phy_device *phydev; 468 int port = dp->index; 469 int mode; 470 int err; 471 472 err = of_phy_register_fixed_link(dn); 473 if (err) { 474 dev_err(ds->dev, 475 "failed to register the fixed PHY of port %d\n", 476 port); 477 return err; 478 } 479 480 phydev = of_phy_find_device(dn); 481 482 mode = of_get_phy_mode(dn); 483 if (mode < 0) 484 mode = PHY_INTERFACE_MODE_NA; 485 phydev->interface = mode; 486 487 genphy_config_init(phydev); 488 genphy_read_status(phydev); 489 490 if (ds->ops->adjust_link) 491 ds->ops->adjust_link(ds, port, phydev); 492 493 put_device(&phydev->mdio.dev); 494 495 return 0; 496 } 497 498 int dsa_port_link_register_of(struct dsa_port *dp) 499 { 500 if (of_phy_is_fixed_link(dp->dn)) 501 return dsa_port_fixed_link_register_of(dp); 502 else 503 return dsa_port_setup_phy_of(dp, true); 504 } 505 506 void dsa_port_link_unregister_of(struct dsa_port *dp) 507 { 508 if (of_phy_is_fixed_link(dp->dn)) 509 of_phy_deregister_fixed_link(dp->dn); 510 else 511 dsa_port_setup_phy_of(dp, false); 512 } 513 514 int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data) 515 { 516 struct phy_device *phydev; 517 int ret = -EOPNOTSUPP; 518 519 if (of_phy_is_fixed_link(dp->dn)) 520 return ret; 521 522 phydev = dsa_port_get_phy_device(dp); 523 if (IS_ERR_OR_NULL(phydev)) 524 return ret; 525 526 ret = phy_ethtool_get_strings(phydev, data); 527 put_device(&phydev->mdio.dev); 528 529 return ret; 530 } 531 EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings); 532 533 int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data) 534 { 535 struct phy_device *phydev; 536 int ret = -EOPNOTSUPP; 537 538 if (of_phy_is_fixed_link(dp->dn)) 539 return ret; 540 541 phydev = dsa_port_get_phy_device(dp); 542 if (IS_ERR_OR_NULL(phydev)) 543 return ret; 544 545 ret = phy_ethtool_get_stats(phydev, NULL, data); 546 put_device(&phydev->mdio.dev); 547 548 return ret; 549 } 550 EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats); 551 552 int dsa_port_get_phy_sset_count(struct dsa_port *dp) 553 { 554 struct phy_device *phydev; 555 int ret = -EOPNOTSUPP; 556 557 if (of_phy_is_fixed_link(dp->dn)) 558 return ret; 559 560 phydev = dsa_port_get_phy_device(dp); 561 if (IS_ERR_OR_NULL(phydev)) 562 return ret; 563 564 ret = phy_ethtool_get_sset_count(phydev); 565 put_device(&phydev->mdio.dev); 566 567 return ret; 568 } 569 EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count); 570