net/dsa/port.c

   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);