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 bool dsa_switch_mdb_match(struct dsa_switch *ds, int port, 132 struct dsa_notifier_mdb_info *info) 133 { 134 if (ds->index == info->sw_index && port == info->port) 135 return true; 136 137 if (dsa_is_dsa_port(ds, port)) 138 return true; 139 140 return false; 141 } 142 143 static int dsa_switch_mdb_prepare(struct dsa_switch *ds, 144 struct dsa_notifier_mdb_info *info) 145 { 146 int port, err; 147 148 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add) 149 return -EOPNOTSUPP; 150 151 for (port = 0; port < ds->num_ports; port++) { 152 if (dsa_switch_mdb_match(ds, port, info)) { 153 err = ds->ops->port_mdb_prepare(ds, port, info->mdb); 154 if (err) 155 return err; 156 } 157 } 158 159 return 0; 160 } 161 162 static int dsa_switch_mdb_add(struct dsa_switch *ds, 163 struct dsa_notifier_mdb_info *info) 164 { 165 int port; 166 167 if (switchdev_trans_ph_prepare(info->trans)) 168 return dsa_switch_mdb_prepare(ds, info); 169 170 if (!ds->ops->port_mdb_add) 171 return 0; 172 173 for (port = 0; port < ds->num_ports; port++) 174 if (dsa_switch_mdb_match(ds, port, info)) 175 ds->ops->port_mdb_add(ds, port, info->mdb); 176 177 return 0; 178 } 179 180 static int dsa_switch_mdb_del(struct dsa_switch *ds, 181 struct dsa_notifier_mdb_info *info) 182 { 183 if (!ds->ops->port_mdb_del) 184 return -EOPNOTSUPP; 185 186 if (ds->index == info->sw_index) 187 return ds->ops->port_mdb_del(ds, info->port, info->mdb); 188 189 return 0; 190 } 191 192 static int dsa_port_vlan_device_check(struct net_device *vlan_dev, 193 int vlan_dev_vid, 194 void *arg) 195 { 196 struct switchdev_obj_port_vlan *vlan = arg; 197 u16 vid; 198 199 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 200 if (vid == vlan_dev_vid) 201 return -EBUSY; 202 } 203 204 return 0; 205 } 206 207 static int dsa_port_vlan_check(struct dsa_switch *ds, int port, 208 const struct switchdev_obj_port_vlan *vlan) 209 { 210 const struct dsa_port *dp = dsa_to_port(ds, port); 211 int err = 0; 212 213 /* Device is not bridged, let it proceed with the VLAN device 214 * creation. 215 */ 216 if (!dp->bridge_dev) 217 return err; 218 219 /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and 220 * already checks whether there is an overlapping bridge VLAN entry 221 * with the same VID, so here we only need to check that if we are 222 * adding a bridge VLAN entry there is not an overlapping VLAN device 223 * claiming that VID. 224 */ 225 return vlan_for_each(dp->slave, dsa_port_vlan_device_check, 226 (void *)vlan); 227 } 228 229 static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port, 230 struct dsa_notifier_vlan_info *info) 231 { 232 if (ds->index == info->sw_index && port == info->port) 233 return true; 234 235 if (dsa_is_dsa_port(ds, port)) 236 return true; 237 238 return false; 239 } 240 241 static int dsa_switch_vlan_prepare(struct dsa_switch *ds, 242 struct dsa_notifier_vlan_info *info) 243 { 244 int port, err; 245 246 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add) 247 return -EOPNOTSUPP; 248 249 for (port = 0; port < ds->num_ports; port++) { 250 if (dsa_switch_vlan_match(ds, port, info)) { 251 err = dsa_port_vlan_check(ds, port, info->vlan); 252 if (err) 253 return err; 254 255 err = ds->ops->port_vlan_prepare(ds, port, info->vlan); 256 if (err) 257 return err; 258 } 259 } 260 261 return 0; 262 } 263 264 static int dsa_switch_vlan_add(struct dsa_switch *ds, 265 struct dsa_notifier_vlan_info *info) 266 { 267 int port; 268 269 if (switchdev_trans_ph_prepare(info->trans)) 270 return dsa_switch_vlan_prepare(ds, info); 271 272 if (!ds->ops->port_vlan_add) 273 return 0; 274 275 for (port = 0; port < ds->num_ports; port++) 276 if (dsa_switch_vlan_match(ds, port, info)) 277 ds->ops->port_vlan_add(ds, port, info->vlan); 278 279 return 0; 280 } 281 282 static int dsa_switch_vlan_del(struct dsa_switch *ds, 283 struct dsa_notifier_vlan_info *info) 284 { 285 if (!ds->ops->port_vlan_del) 286 return -EOPNOTSUPP; 287 288 if (ds->index == info->sw_index) 289 return ds->ops->port_vlan_del(ds, info->port, info->vlan); 290 291 /* Do not deprogram the DSA links as they may be used as conduit 292 * for other VLAN members in the fabric. 293 */ 294 return 0; 295 } 296 297 static int dsa_switch_event(struct notifier_block *nb, 298 unsigned long event, void *info) 299 { 300 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); 301 int err; 302 303 switch (event) { 304 case DSA_NOTIFIER_AGEING_TIME: 305 err = dsa_switch_ageing_time(ds, info); 306 break; 307 case DSA_NOTIFIER_BRIDGE_JOIN: 308 err = dsa_switch_bridge_join(ds, info); 309 break; 310 case DSA_NOTIFIER_BRIDGE_LEAVE: 311 err = dsa_switch_bridge_leave(ds, info); 312 break; 313 case DSA_NOTIFIER_FDB_ADD: 314 err = dsa_switch_fdb_add(ds, info); 315 break; 316 case DSA_NOTIFIER_FDB_DEL: 317 err = dsa_switch_fdb_del(ds, info); 318 break; 319 case DSA_NOTIFIER_MDB_ADD: 320 err = dsa_switch_mdb_add(ds, info); 321 break; 322 case DSA_NOTIFIER_MDB_DEL: 323 err = dsa_switch_mdb_del(ds, info); 324 break; 325 case DSA_NOTIFIER_VLAN_ADD: 326 err = dsa_switch_vlan_add(ds, info); 327 break; 328 case DSA_NOTIFIER_VLAN_DEL: 329 err = dsa_switch_vlan_del(ds, info); 330 break; 331 default: 332 err = -EOPNOTSUPP; 333 break; 334 } 335 336 /* Non-switchdev operations cannot be rolled back. If a DSA driver 337 * returns an error during the chained call, switch chips may be in an 338 * inconsistent state. 339 */ 340 if (err) 341 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", 342 event, err); 343 344 return notifier_from_errno(err); 345 } 346 347 int dsa_switch_register_notifier(struct dsa_switch *ds) 348 { 349 ds->nb.notifier_call = dsa_switch_event; 350 351 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); 352 } 353 354 void dsa_switch_unregister_notifier(struct dsa_switch *ds) 355 { 356 int err; 357 358 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); 359 if (err) 360 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); 361 } 362