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 for_each_set_bit(port, bitmap, ds->num_ports) 157 ds->ops->port_mdb_add(ds, port, mdb); 158 } 159 160 static int dsa_switch_mdb_add(struct dsa_switch *ds, 161 struct dsa_notifier_mdb_info *info) 162 { 163 const struct switchdev_obj_port_mdb *mdb = info->mdb; 164 struct switchdev_trans *trans = info->trans; 165 int port; 166 167 /* Build a mask of Multicast group members */ 168 bitmap_zero(ds->bitmap, ds->num_ports); 169 if (ds->index == info->sw_index) 170 set_bit(info->port, ds->bitmap); 171 for (port = 0; port < ds->num_ports; port++) 172 if (dsa_is_dsa_port(ds, port)) 173 set_bit(port, ds->bitmap); 174 175 if (switchdev_trans_ph_prepare(trans)) 176 return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap); 177 178 dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap); 179 180 return 0; 181 } 182 183 static int dsa_switch_mdb_del(struct dsa_switch *ds, 184 struct dsa_notifier_mdb_info *info) 185 { 186 const struct switchdev_obj_port_mdb *mdb = info->mdb; 187 188 if (!ds->ops->port_mdb_del) 189 return -EOPNOTSUPP; 190 191 if (ds->index == info->sw_index) 192 return ds->ops->port_mdb_del(ds, info->port, mdb); 193 194 return 0; 195 } 196 197 static int dsa_port_vlan_device_check(struct net_device *vlan_dev, 198 int vlan_dev_vid, 199 void *arg) 200 { 201 struct switchdev_obj_port_vlan *vlan = arg; 202 u16 vid; 203 204 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 205 if (vid == vlan_dev_vid) 206 return -EBUSY; 207 } 208 209 return 0; 210 } 211 212 static int dsa_port_vlan_check(struct dsa_switch *ds, int port, 213 const struct switchdev_obj_port_vlan *vlan) 214 { 215 const struct dsa_port *dp = dsa_to_port(ds, port); 216 int err = 0; 217 218 /* Device is not bridged, let it proceed with the VLAN device 219 * creation. 220 */ 221 if (!dp->bridge_dev) 222 return err; 223 224 /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and 225 * already checks whether there is an overlapping bridge VLAN entry 226 * with the same VID, so here we only need to check that if we are 227 * adding a bridge VLAN entry there is not an overlapping VLAN device 228 * claiming that VID. 229 */ 230 return vlan_for_each(dp->slave, dsa_port_vlan_device_check, 231 (void *)vlan); 232 } 233 234 static int 235 dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds, 236 const struct switchdev_obj_port_vlan *vlan, 237 const unsigned long *bitmap) 238 { 239 int port, err; 240 241 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add) 242 return -EOPNOTSUPP; 243 244 for_each_set_bit(port, bitmap, ds->num_ports) { 245 err = dsa_port_vlan_check(ds, port, vlan); 246 if (err) 247 return err; 248 249 err = ds->ops->port_vlan_prepare(ds, port, vlan); 250 if (err) 251 return err; 252 } 253 254 return 0; 255 } 256 257 static void 258 dsa_switch_vlan_add_bitmap(struct dsa_switch *ds, 259 const struct switchdev_obj_port_vlan *vlan, 260 const unsigned long *bitmap) 261 { 262 int port; 263 264 for_each_set_bit(port, bitmap, ds->num_ports) 265 ds->ops->port_vlan_add(ds, port, vlan); 266 } 267 268 static int dsa_switch_vlan_add(struct dsa_switch *ds, 269 struct dsa_notifier_vlan_info *info) 270 { 271 const struct switchdev_obj_port_vlan *vlan = info->vlan; 272 struct switchdev_trans *trans = info->trans; 273 int port; 274 275 /* Build a mask of VLAN members */ 276 bitmap_zero(ds->bitmap, ds->num_ports); 277 if (ds->index == info->sw_index) 278 set_bit(info->port, ds->bitmap); 279 for (port = 0; port < ds->num_ports; port++) 280 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) 281 set_bit(port, ds->bitmap); 282 283 if (switchdev_trans_ph_prepare(trans)) 284 return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap); 285 286 dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap); 287 288 return 0; 289 } 290 291 static int dsa_switch_vlan_del(struct dsa_switch *ds, 292 struct dsa_notifier_vlan_info *info) 293 { 294 const struct switchdev_obj_port_vlan *vlan = info->vlan; 295 296 if (!ds->ops->port_vlan_del) 297 return -EOPNOTSUPP; 298 299 if (ds->index == info->sw_index) 300 return ds->ops->port_vlan_del(ds, info->port, vlan); 301 302 return 0; 303 } 304 305 static int dsa_switch_event(struct notifier_block *nb, 306 unsigned long event, void *info) 307 { 308 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); 309 int err; 310 311 switch (event) { 312 case DSA_NOTIFIER_AGEING_TIME: 313 err = dsa_switch_ageing_time(ds, info); 314 break; 315 case DSA_NOTIFIER_BRIDGE_JOIN: 316 err = dsa_switch_bridge_join(ds, info); 317 break; 318 case DSA_NOTIFIER_BRIDGE_LEAVE: 319 err = dsa_switch_bridge_leave(ds, info); 320 break; 321 case DSA_NOTIFIER_FDB_ADD: 322 err = dsa_switch_fdb_add(ds, info); 323 break; 324 case DSA_NOTIFIER_FDB_DEL: 325 err = dsa_switch_fdb_del(ds, info); 326 break; 327 case DSA_NOTIFIER_MDB_ADD: 328 err = dsa_switch_mdb_add(ds, info); 329 break; 330 case DSA_NOTIFIER_MDB_DEL: 331 err = dsa_switch_mdb_del(ds, info); 332 break; 333 case DSA_NOTIFIER_VLAN_ADD: 334 err = dsa_switch_vlan_add(ds, info); 335 break; 336 case DSA_NOTIFIER_VLAN_DEL: 337 err = dsa_switch_vlan_del(ds, info); 338 break; 339 default: 340 err = -EOPNOTSUPP; 341 break; 342 } 343 344 /* Non-switchdev operations cannot be rolled back. If a DSA driver 345 * returns an error during the chained call, switch chips may be in an 346 * inconsistent state. 347 */ 348 if (err) 349 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", 350 event, err); 351 352 return notifier_from_errno(err); 353 } 354 355 int dsa_switch_register_notifier(struct dsa_switch *ds) 356 { 357 ds->nb.notifier_call = dsa_switch_event; 358 359 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); 360 } 361 362 void dsa_switch_unregister_notifier(struct dsa_switch *ds) 363 { 364 int err; 365 366 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); 367 if (err) 368 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); 369 } 370