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 = &ds->ports[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 int dsa_switch_bridge_join(struct dsa_switch *ds, 56 struct dsa_notifier_bridge_info *info) 57 { 58 if (ds->index == info->sw_index && ds->ops->port_bridge_join) 59 return ds->ops->port_bridge_join(ds, info->port, info->br); 60 61 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join) 62 return ds->ops->crosschip_bridge_join(ds, info->sw_index, 63 info->port, info->br); 64 65 return 0; 66 } 67 68 static int dsa_switch_bridge_leave(struct dsa_switch *ds, 69 struct dsa_notifier_bridge_info *info) 70 { 71 bool unset_vlan_filtering = br_vlan_enabled(info->br); 72 int err, i; 73 74 if (ds->index == info->sw_index && ds->ops->port_bridge_leave) 75 ds->ops->port_bridge_leave(ds, info->port, info->br); 76 77 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave) 78 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port, 79 info->br); 80 81 /* If the bridge was vlan_filtering, the bridge core doesn't trigger an 82 * event for changing vlan_filtering setting upon slave ports leaving 83 * it. That is a good thing, because that lets us handle it and also 84 * handle the case where the switch's vlan_filtering setting is global 85 * (not per port). When that happens, the correct moment to trigger the 86 * vlan_filtering callback is only when the last port left this bridge. 87 */ 88 if (unset_vlan_filtering && ds->vlan_filtering_is_global) { 89 for (i = 0; i < ds->num_ports; i++) { 90 if (i == info->port) 91 continue; 92 if (dsa_to_port(ds, i)->bridge_dev == info->br) { 93 unset_vlan_filtering = false; 94 break; 95 } 96 } 97 } 98 if (unset_vlan_filtering) { 99 struct switchdev_trans trans = {0}; 100 101 err = dsa_port_vlan_filtering(&ds->ports[info->port], 102 false, &trans); 103 if (err && err != EOPNOTSUPP) 104 return err; 105 } 106 return 0; 107 } 108 109 static int dsa_switch_fdb_add(struct dsa_switch *ds, 110 struct dsa_notifier_fdb_info *info) 111 { 112 int port = dsa_towards_port(ds, info->sw_index, info->port); 113 114 if (!ds->ops->port_fdb_add) 115 return -EOPNOTSUPP; 116 117 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid); 118 } 119 120 static int dsa_switch_fdb_del(struct dsa_switch *ds, 121 struct dsa_notifier_fdb_info *info) 122 { 123 int port = dsa_towards_port(ds, info->sw_index, info->port); 124 125 if (!ds->ops->port_fdb_del) 126 return -EOPNOTSUPP; 127 128 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid); 129 } 130 131 static int 132 dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds, 133 const struct switchdev_obj_port_mdb *mdb, 134 const unsigned long *bitmap) 135 { 136 int port, err; 137 138 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add) 139 return -EOPNOTSUPP; 140 141 for_each_set_bit(port, bitmap, ds->num_ports) { 142 err = ds->ops->port_mdb_prepare(ds, port, mdb); 143 if (err) 144 return err; 145 } 146 147 return 0; 148 } 149 150 static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds, 151 const struct switchdev_obj_port_mdb *mdb, 152 const unsigned long *bitmap) 153 { 154 int port; 155 156 if (!ds->ops->port_mdb_add) 157 return; 158 159 for_each_set_bit(port, bitmap, ds->num_ports) 160 ds->ops->port_mdb_add(ds, port, mdb); 161 } 162 163 static int dsa_switch_mdb_add(struct dsa_switch *ds, 164 struct dsa_notifier_mdb_info *info) 165 { 166 const struct switchdev_obj_port_mdb *mdb = info->mdb; 167 struct switchdev_trans *trans = info->trans; 168 int port; 169 170 /* Build a mask of Multicast group members */ 171 bitmap_zero(ds->bitmap, ds->num_ports); 172 if (ds->index == info->sw_index) 173 set_bit(info->port, ds->bitmap); 174 for (port = 0; port < ds->num_ports; port++) 175 if (dsa_is_dsa_port(ds, port)) 176 set_bit(port, ds->bitmap); 177 178 if (switchdev_trans_ph_prepare(trans)) 179 return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap); 180 181 dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap); 182 183 return 0; 184 } 185 186 static int dsa_switch_mdb_del(struct dsa_switch *ds, 187 struct dsa_notifier_mdb_info *info) 188 { 189 const struct switchdev_obj_port_mdb *mdb = info->mdb; 190 191 if (!ds->ops->port_mdb_del) 192 return -EOPNOTSUPP; 193 194 if (ds->index == info->sw_index) 195 return ds->ops->port_mdb_del(ds, info->port, mdb); 196 197 return 0; 198 } 199 200 static int dsa_port_vlan_device_check(struct net_device *vlan_dev, 201 int vlan_dev_vid, 202 void *arg) 203 { 204 struct switchdev_obj_port_vlan *vlan = arg; 205 u16 vid; 206 207 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 208 if (vid == vlan_dev_vid) 209 return -EBUSY; 210 } 211 212 return 0; 213 } 214 215 static int dsa_port_vlan_check(struct dsa_switch *ds, int port, 216 const struct switchdev_obj_port_vlan *vlan) 217 { 218 const struct dsa_port *dp = dsa_to_port(ds, port); 219 int err = 0; 220 221 /* Device is not bridged, let it proceed with the VLAN device 222 * creation. 223 */ 224 if (!dp->bridge_dev) 225 return err; 226 227 /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and 228 * already checks whether there is an overlapping bridge VLAN entry 229 * with the same VID, so here we only need to check that if we are 230 * adding a bridge VLAN entry there is not an overlapping VLAN device 231 * claiming that VID. 232 */ 233 return vlan_for_each(dp->slave, dsa_port_vlan_device_check, 234 (void *)vlan); 235 } 236 237 static int 238 dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds, 239 const struct switchdev_obj_port_vlan *vlan, 240 const unsigned long *bitmap) 241 { 242 int port, err; 243 244 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add) 245 return -EOPNOTSUPP; 246 247 for_each_set_bit(port, bitmap, ds->num_ports) { 248 err = dsa_port_vlan_check(ds, port, vlan); 249 if (err) 250 return err; 251 252 err = ds->ops->port_vlan_prepare(ds, port, vlan); 253 if (err) 254 return err; 255 } 256 257 return 0; 258 } 259 260 static void 261 dsa_switch_vlan_add_bitmap(struct dsa_switch *ds, 262 const struct switchdev_obj_port_vlan *vlan, 263 const unsigned long *bitmap) 264 { 265 int port; 266 267 for_each_set_bit(port, bitmap, ds->num_ports) 268 ds->ops->port_vlan_add(ds, port, vlan); 269 } 270 271 static int dsa_switch_vlan_add(struct dsa_switch *ds, 272 struct dsa_notifier_vlan_info *info) 273 { 274 const struct switchdev_obj_port_vlan *vlan = info->vlan; 275 struct switchdev_trans *trans = info->trans; 276 int port; 277 278 /* Build a mask of VLAN members */ 279 bitmap_zero(ds->bitmap, ds->num_ports); 280 if (ds->index == info->sw_index) 281 set_bit(info->port, ds->bitmap); 282 for (port = 0; port < ds->num_ports; port++) 283 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) 284 set_bit(port, ds->bitmap); 285 286 if (switchdev_trans_ph_prepare(trans)) 287 return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap); 288 289 dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap); 290 291 return 0; 292 } 293 294 static int dsa_switch_vlan_del(struct dsa_switch *ds, 295 struct dsa_notifier_vlan_info *info) 296 { 297 const struct switchdev_obj_port_vlan *vlan = info->vlan; 298 299 if (!ds->ops->port_vlan_del) 300 return -EOPNOTSUPP; 301 302 if (ds->index == info->sw_index) 303 return ds->ops->port_vlan_del(ds, info->port, vlan); 304 305 return 0; 306 } 307 308 static int dsa_switch_event(struct notifier_block *nb, 309 unsigned long event, void *info) 310 { 311 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); 312 int err; 313 314 switch (event) { 315 case DSA_NOTIFIER_AGEING_TIME: 316 err = dsa_switch_ageing_time(ds, info); 317 break; 318 case DSA_NOTIFIER_BRIDGE_JOIN: 319 err = dsa_switch_bridge_join(ds, info); 320 break; 321 case DSA_NOTIFIER_BRIDGE_LEAVE: 322 err = dsa_switch_bridge_leave(ds, info); 323 break; 324 case DSA_NOTIFIER_FDB_ADD: 325 err = dsa_switch_fdb_add(ds, info); 326 break; 327 case DSA_NOTIFIER_FDB_DEL: 328 err = dsa_switch_fdb_del(ds, info); 329 break; 330 case DSA_NOTIFIER_MDB_ADD: 331 err = dsa_switch_mdb_add(ds, info); 332 break; 333 case DSA_NOTIFIER_MDB_DEL: 334 err = dsa_switch_mdb_del(ds, info); 335 break; 336 case DSA_NOTIFIER_VLAN_ADD: 337 err = dsa_switch_vlan_add(ds, info); 338 break; 339 case DSA_NOTIFIER_VLAN_DEL: 340 err = dsa_switch_vlan_del(ds, info); 341 break; 342 default: 343 err = -EOPNOTSUPP; 344 break; 345 } 346 347 /* Non-switchdev operations cannot be rolled back. If a DSA driver 348 * returns an error during the chained call, switch chips may be in an 349 * inconsistent state. 350 */ 351 if (err) 352 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", 353 event, err); 354 355 return notifier_from_errno(err); 356 } 357 358 int dsa_switch_register_notifier(struct dsa_switch *ds) 359 { 360 ds->nb.notifier_call = dsa_switch_event; 361 362 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); 363 } 364 365 void dsa_switch_unregister_notifier(struct dsa_switch *ds) 366 { 367 int err; 368 369 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); 370 if (err) 371 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); 372 } 373