net/dsa/switch.c

   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         struct switchdev_trans *trans = info->trans;
  37
  38         if (switchdev_trans_ph_prepare(trans)) {
  39                 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
  40                         return -ERANGE;
  41                 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
  42                         return -ERANGE;
  43                 return 0;
  44         }
  45
  46         /* Program the fastest ageing time in case of multiple bridges */
  47         ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
  48
  49         if (ds->ops->set_ageing_time)
  50                 return ds->ops->set_ageing_time(ds, ageing_time);
  51
  52         return 0;
  53 }
  54
  55 static bool dsa_switch_mtu_match(struct dsa_switch *ds, int port,
  56                                  struct dsa_notifier_mtu_info *info)
  57 {
  58         if (ds->index == info->sw_index)
  59                 return (port == info->port) || dsa_is_dsa_port(ds, port);
  60
  61         if (!info->propagate_upstream)
  62                 return false;
  63
  64         if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
  65                 return true;
  66
  67         return false;
  68 }
  69
  70 static int dsa_switch_mtu(struct dsa_switch *ds,
  71                           struct dsa_notifier_mtu_info *info)
  72 {
  73         int port, ret;
  74
  75         if (!ds->ops->port_change_mtu)
  76                 return -EOPNOTSUPP;
  77
  78         for (port = 0; port < ds->num_ports; port++) {
  79                 if (dsa_switch_mtu_match(ds, port, info)) {
  80                         ret = ds->ops->port_change_mtu(ds, port, info->mtu);
  81                         if (ret)
  82                                 return ret;
  83                 }
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int dsa_switch_bridge_join(struct dsa_switch *ds,
  90                                   struct dsa_notifier_bridge_info *info)
  91 {
  92         if (ds->index == info->sw_index && ds->ops->port_bridge_join)
  93                 return ds->ops->port_bridge_join(ds, info->port, info->br);
  94
  95         if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
  96                 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
  97                                                       info->port, info->br);
  98
  99         return 0;
 100 }
 101
 102 static int dsa_switch_bridge_leave(struct dsa_switch *ds,
 103                                    struct dsa_notifier_bridge_info *info)
 104 {
 105         bool unset_vlan_filtering = br_vlan_enabled(info->br);
 106         int err, i;
 107
 108         if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
 109                 ds->ops->port_bridge_leave(ds, info->port, info->br);
 110
 111         if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
 112                 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
 113                                                 info->br);
 114
 115         /* If the bridge was vlan_filtering, the bridge core doesn't trigger an
 116          * event for changing vlan_filtering setting upon slave ports leaving
 117          * it. That is a good thing, because that lets us handle it and also
 118          * handle the case where the switch's vlan_filtering setting is global
 119          * (not per port). When that happens, the correct moment to trigger the
 120          * vlan_filtering callback is only when the last port left this bridge.
 121          */
 122         if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
 123                 for (i = 0; i < ds->num_ports; i++) {
 124                         if (i == info->port)
 125                                 continue;
 126                         if (dsa_to_port(ds, i)->bridge_dev == info->br) {
 127                                 unset_vlan_filtering = false;
 128                                 break;
 129                         }
 130                 }
 131         }
 132         if (unset_vlan_filtering) {
 133                 struct switchdev_trans trans = {0};
 134
 135                 err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
 136                                               false, &trans);
 137                 if (err && err != EOPNOTSUPP)
 138                         return err;
 139         }
 140         return 0;
 141 }
 142
 143 static int dsa_switch_fdb_add(struct dsa_switch *ds,
 144                               struct dsa_notifier_fdb_info *info)
 145 {
 146         int port = dsa_towards_port(ds, info->sw_index, info->port);
 147
 148         if (!ds->ops->port_fdb_add)
 149                 return -EOPNOTSUPP;
 150
 151         return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
 152 }
 153
 154 static int dsa_switch_fdb_del(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_del)
 160                 return -EOPNOTSUPP;
 161
 162         return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
 163 }
 164
 165 static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
 166                                  struct dsa_notifier_mdb_info *info)
 167 {
 168         if (ds->index == info->sw_index && port == info->port)
 169                 return true;
 170
 171         if (dsa_is_dsa_port(ds, port))
 172                 return true;
 173
 174         return false;
 175 }
 176
 177 static int dsa_switch_mdb_prepare(struct dsa_switch *ds,
 178                                   struct dsa_notifier_mdb_info *info)
 179 {
 180         int port, err;
 181
 182         if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 183                 return -EOPNOTSUPP;
 184
 185         for (port = 0; port < ds->num_ports; port++) {
 186                 if (dsa_switch_mdb_match(ds, port, info)) {
 187                         err = ds->ops->port_mdb_prepare(ds, port, info->mdb);
 188                         if (err)
 189                                 return err;
 190                 }
 191         }
 192
 193         return 0;
 194 }
 195
 196 static int dsa_switch_mdb_add(struct dsa_switch *ds,
 197                               struct dsa_notifier_mdb_info *info)
 198 {
 199         int port;
 200
 201         if (switchdev_trans_ph_prepare(info->trans))
 202                 return dsa_switch_mdb_prepare(ds, info);
 203
 204         if (!ds->ops->port_mdb_add)
 205                 return 0;
 206
 207         for (port = 0; port < ds->num_ports; port++)
 208                 if (dsa_switch_mdb_match(ds, port, info))
 209                         ds->ops->port_mdb_add(ds, port, info->mdb);
 210
 211         return 0;
 212 }
 213
 214 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 215                               struct dsa_notifier_mdb_info *info)
 216 {
 217         if (!ds->ops->port_mdb_del)
 218                 return -EOPNOTSUPP;
 219
 220         if (ds->index == info->sw_index)
 221                 return ds->ops->port_mdb_del(ds, info->port, info->mdb);
 222
 223         return 0;
 224 }
 225
 226 static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
 227                                       int vlan_dev_vid,
 228                                       void *arg)
 229 {
 230         struct switchdev_obj_port_vlan *vlan = arg;
 231         u16 vid;
 232
 233         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 234                 if (vid == vlan_dev_vid)
 235                         return -EBUSY;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
 242                                const struct switchdev_obj_port_vlan *vlan)
 243 {
 244         const struct dsa_port *dp = dsa_to_port(ds, port);
 245         int err = 0;
 246
 247         /* Device is not bridged, let it proceed with the VLAN device
 248          * creation.
 249          */
 250         if (!dp->bridge_dev)
 251                 return err;
 252
 253         /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and
 254          * already checks whether there is an overlapping bridge VLAN entry
 255          * with the same VID, so here we only need to check that if we are
 256          * adding a bridge VLAN entry there is not an overlapping VLAN device
 257          * claiming that VID.
 258          */
 259         return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
 260                              (void *)vlan);
 261 }
 262
 263 static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
 264                                   struct dsa_notifier_vlan_info *info)
 265 {
 266         if (ds->index == info->sw_index && port == info->port)
 267                 return true;
 268
 269         if (dsa_is_dsa_port(ds, port))
 270                 return true;
 271
 272         return false;
 273 }
 274
 275 static int dsa_switch_vlan_prepare(struct dsa_switch *ds,
 276                                    struct dsa_notifier_vlan_info *info)
 277 {
 278         int port, err;
 279
 280         if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 281                 return -EOPNOTSUPP;
 282
 283         for (port = 0; port < ds->num_ports; port++) {
 284                 if (dsa_switch_vlan_match(ds, port, info)) {
 285                         err = dsa_port_vlan_check(ds, port, info->vlan);
 286                         if (err)
 287                                 return err;
 288
 289                         err = ds->ops->port_vlan_prepare(ds, port, info->vlan);
 290                         if (err)
 291                                 return err;
 292                 }
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 299                                struct dsa_notifier_vlan_info *info)
 300 {
 301         int port;
 302
 303         if (switchdev_trans_ph_prepare(info->trans))
 304                 return dsa_switch_vlan_prepare(ds, info);
 305
 306         if (!ds->ops->port_vlan_add)
 307                 return 0;
 308
 309         for (port = 0; port < ds->num_ports; port++)
 310                 if (dsa_switch_vlan_match(ds, port, info))
 311                         ds->ops->port_vlan_add(ds, port, info->vlan);
 312
 313         return 0;
 314 }
 315
 316 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 317                                struct dsa_notifier_vlan_info *info)
 318 {
 319         if (!ds->ops->port_vlan_del)
 320                 return -EOPNOTSUPP;
 321
 322         if (ds->index == info->sw_index)
 323                 return ds->ops->port_vlan_del(ds, info->port, info->vlan);
 324
 325         /* Do not deprogram the DSA links as they may be used as conduit
 326          * for other VLAN members in the fabric.
 327          */
 328         return 0;
 329 }
 330
 331 static int dsa_switch_event(struct notifier_block *nb,
 332                             unsigned long event, void *info)
 333 {
 334         struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 335         int err;
 336
 337         switch (event) {
 338         case DSA_NOTIFIER_AGEING_TIME:
 339                 err = dsa_switch_ageing_time(ds, info);
 340                 break;
 341         case DSA_NOTIFIER_BRIDGE_JOIN:
 342                 err = dsa_switch_bridge_join(ds, info);
 343                 break;
 344         case DSA_NOTIFIER_BRIDGE_LEAVE:
 345                 err = dsa_switch_bridge_leave(ds, info);
 346                 break;
 347         case DSA_NOTIFIER_FDB_ADD:
 348                 err = dsa_switch_fdb_add(ds, info);
 349                 break;
 350         case DSA_NOTIFIER_FDB_DEL:
 351                 err = dsa_switch_fdb_del(ds, info);
 352                 break;
 353         case DSA_NOTIFIER_MDB_ADD:
 354                 err = dsa_switch_mdb_add(ds, info);
 355                 break;
 356         case DSA_NOTIFIER_MDB_DEL:
 357                 err = dsa_switch_mdb_del(ds, info);
 358                 break;
 359         case DSA_NOTIFIER_VLAN_ADD:
 360                 err = dsa_switch_vlan_add(ds, info);
 361                 break;
 362         case DSA_NOTIFIER_VLAN_DEL:
 363                 err = dsa_switch_vlan_del(ds, info);
 364                 break;
 365         case DSA_NOTIFIER_MTU:
 366                 err = dsa_switch_mtu(ds, info);
 367                 break;
 368         default:
 369                 err = -EOPNOTSUPP;
 370                 break;
 371         }
 372
 373         /* Non-switchdev operations cannot be rolled back. If a DSA driver
 374          * returns an error during the chained call, switch chips may be in an
 375          * inconsistent state.
 376          */
 377         if (err)
 378                 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
 379                         event, err);
 380
 381         return notifier_from_errno(err);
 382 }
 383
 384 int dsa_switch_register_notifier(struct dsa_switch *ds)
 385 {
 386         ds->nb.notifier_call = dsa_switch_event;
 387
 388         return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
 389 }
 390
 391 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
 392 {
 393         int err;
 394
 395         err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
 396         if (err)
 397                 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
 398 }