1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Texas Instruments switchdev Driver 4 * 5 * Copyright (C) 2019 Texas Instruments 6 * 7 */ 8 9 #include <linux/etherdevice.h> 10 #include <linux/if_bridge.h> 11 #include <linux/netdevice.h> 12 #include <linux/workqueue.h> 13 #include <net/switchdev.h> 14 15 #include "cpsw.h" 16 #include "cpsw_ale.h" 17 #include "cpsw_priv.h" 18 #include "cpsw_switchdev.h" 19 20 struct cpsw_switchdev_event_work { 21 struct work_struct work; 22 struct switchdev_notifier_fdb_info fdb_info; 23 struct cpsw_priv *priv; 24 unsigned long event; 25 }; 26 27 static int cpsw_port_stp_state_set(struct cpsw_priv *priv, u8 state) 28 { 29 struct cpsw_common *cpsw = priv->cpsw; 30 u8 cpsw_state; 31 int ret = 0; 32 33 switch (state) { 34 case BR_STATE_FORWARDING: 35 cpsw_state = ALE_PORT_STATE_FORWARD; 36 break; 37 case BR_STATE_LEARNING: 38 cpsw_state = ALE_PORT_STATE_LEARN; 39 break; 40 case BR_STATE_DISABLED: 41 cpsw_state = ALE_PORT_STATE_DISABLE; 42 break; 43 case BR_STATE_LISTENING: 44 case BR_STATE_BLOCKING: 45 cpsw_state = ALE_PORT_STATE_BLOCK; 46 break; 47 default: 48 return -EOPNOTSUPP; 49 } 50 51 ret = cpsw_ale_control_set(cpsw->ale, priv->emac_port, 52 ALE_PORT_STATE, cpsw_state); 53 dev_dbg(priv->dev, "ale state: %u\n", cpsw_state); 54 55 return ret; 56 } 57 58 static int cpsw_port_attr_br_flags_set(struct cpsw_priv *priv, 59 struct net_device *orig_dev, 60 struct switchdev_brport_flags flags) 61 { 62 struct cpsw_common *cpsw = priv->cpsw; 63 64 if (flags.mask & BR_MCAST_FLOOD) { 65 bool unreg_mcast_add = false; 66 67 if (flags.val & BR_MCAST_FLOOD) 68 unreg_mcast_add = true; 69 70 dev_dbg(priv->dev, "BR_MCAST_FLOOD: %d port %u\n", 71 unreg_mcast_add, priv->emac_port); 72 73 cpsw_ale_set_unreg_mcast(cpsw->ale, BIT(priv->emac_port), 74 unreg_mcast_add); 75 } 76 77 return 0; 78 } 79 80 static int cpsw_port_attr_br_flags_pre_set(struct net_device *netdev, 81 struct switchdev_brport_flags flags) 82 { 83 if (flags.mask & ~(BR_LEARNING | BR_MCAST_FLOOD)) 84 return -EINVAL; 85 86 return 0; 87 } 88 89 static int cpsw_port_attr_set(struct net_device *ndev, const void *ctx, 90 const struct switchdev_attr *attr, 91 struct netlink_ext_ack *extack) 92 { 93 struct cpsw_priv *priv = netdev_priv(ndev); 94 int ret; 95 96 dev_dbg(priv->dev, "attr: id %u port: %u\n", attr->id, priv->emac_port); 97 98 switch (attr->id) { 99 case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS: 100 ret = cpsw_port_attr_br_flags_pre_set(ndev, 101 attr->u.brport_flags); 102 break; 103 case SWITCHDEV_ATTR_ID_PORT_STP_STATE: 104 ret = cpsw_port_stp_state_set(priv, attr->u.stp_state); 105 dev_dbg(priv->dev, "stp state: %u\n", attr->u.stp_state); 106 break; 107 case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS: 108 ret = cpsw_port_attr_br_flags_set(priv, attr->orig_dev, 109 attr->u.brport_flags); 110 break; 111 default: 112 ret = -EOPNOTSUPP; 113 break; 114 } 115 116 return ret; 117 } 118 119 static u16 cpsw_get_pvid(struct cpsw_priv *priv) 120 { 121 struct cpsw_common *cpsw = priv->cpsw; 122 u32 __iomem *port_vlan_reg; 123 u32 pvid; 124 125 if (priv->emac_port) { 126 int reg = CPSW2_PORT_VLAN; 127 128 if (cpsw->version == CPSW_VERSION_1) 129 reg = CPSW1_PORT_VLAN; 130 pvid = slave_read(cpsw->slaves + (priv->emac_port - 1), reg); 131 } else { 132 port_vlan_reg = &cpsw->host_port_regs->port_vlan; 133 pvid = readl(port_vlan_reg); 134 } 135 136 pvid = pvid & 0xfff; 137 138 return pvid; 139 } 140 141 static void cpsw_set_pvid(struct cpsw_priv *priv, u16 vid, bool cfi, u32 cos) 142 { 143 struct cpsw_common *cpsw = priv->cpsw; 144 void __iomem *port_vlan_reg; 145 u32 pvid; 146 147 pvid = vid; 148 pvid |= cfi ? BIT(12) : 0; 149 pvid |= (cos & 0x7) << 13; 150 151 if (priv->emac_port) { 152 int reg = CPSW2_PORT_VLAN; 153 154 if (cpsw->version == CPSW_VERSION_1) 155 reg = CPSW1_PORT_VLAN; 156 /* no barrier */ 157 slave_write(cpsw->slaves + (priv->emac_port - 1), pvid, reg); 158 } else { 159 /* CPU port */ 160 port_vlan_reg = &cpsw->host_port_regs->port_vlan; 161 writel(pvid, port_vlan_reg); 162 } 163 } 164 165 static int cpsw_port_vlan_add(struct cpsw_priv *priv, bool untag, bool pvid, 166 u16 vid, struct net_device *orig_dev) 167 { 168 bool cpu_port = netif_is_bridge_master(orig_dev); 169 struct cpsw_common *cpsw = priv->cpsw; 170 int unreg_mcast_mask = 0; 171 int reg_mcast_mask = 0; 172 int untag_mask = 0; 173 int port_mask; 174 int ret = 0; 175 u32 flags; 176 177 if (cpu_port) { 178 port_mask = BIT(HOST_PORT_NUM); 179 flags = orig_dev->flags; 180 unreg_mcast_mask = port_mask; 181 } else { 182 port_mask = BIT(priv->emac_port); 183 flags = priv->ndev->flags; 184 } 185 186 if (flags & IFF_MULTICAST) 187 reg_mcast_mask = port_mask; 188 189 if (untag) 190 untag_mask = port_mask; 191 192 ret = cpsw_ale_vlan_add_modify(cpsw->ale, vid, port_mask, untag_mask, 193 reg_mcast_mask, unreg_mcast_mask); 194 if (ret) { 195 dev_err(priv->dev, "Unable to add vlan\n"); 196 return ret; 197 } 198 199 if (cpu_port) 200 cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr, 201 HOST_PORT_NUM, ALE_VLAN, vid); 202 if (!pvid) 203 return ret; 204 205 cpsw_set_pvid(priv, vid, 0, 0); 206 207 dev_dbg(priv->dev, "VID add: %s: vid:%u ports:%X\n", 208 priv->ndev->name, vid, port_mask); 209 return ret; 210 } 211 212 static int cpsw_port_vlan_del(struct cpsw_priv *priv, u16 vid, 213 struct net_device *orig_dev) 214 { 215 bool cpu_port = netif_is_bridge_master(orig_dev); 216 struct cpsw_common *cpsw = priv->cpsw; 217 int port_mask; 218 int ret = 0; 219 220 if (cpu_port) 221 port_mask = BIT(HOST_PORT_NUM); 222 else 223 port_mask = BIT(priv->emac_port); 224 225 ret = cpsw_ale_vlan_del_modify(cpsw->ale, vid, port_mask); 226 if (ret != 0) 227 return ret; 228 229 /* We don't care for the return value here, error is returned only if 230 * the unicast entry is not present 231 */ 232 if (cpu_port) 233 cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr, 234 HOST_PORT_NUM, ALE_VLAN, vid); 235 236 if (vid == cpsw_get_pvid(priv)) 237 cpsw_set_pvid(priv, 0, 0, 0); 238 239 /* We don't care for the return value here, error is returned only if 240 * the multicast entry is not present 241 */ 242 cpsw_ale_del_mcast(cpsw->ale, priv->ndev->broadcast, 243 port_mask, ALE_VLAN, vid); 244 dev_dbg(priv->dev, "VID del: %s: vid:%u ports:%X\n", 245 priv->ndev->name, vid, port_mask); 246 247 return ret; 248 } 249 250 static int cpsw_port_vlans_add(struct cpsw_priv *priv, 251 const struct switchdev_obj_port_vlan *vlan) 252 { 253 bool untag = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 254 struct net_device *orig_dev = vlan->obj.orig_dev; 255 bool cpu_port = netif_is_bridge_master(orig_dev); 256 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 257 258 dev_dbg(priv->dev, "VID add: %s: vid:%u flags:%X\n", 259 priv->ndev->name, vlan->vid, vlan->flags); 260 261 if (cpu_port && !(vlan->flags & BRIDGE_VLAN_INFO_BRENTRY)) 262 return 0; 263 264 return cpsw_port_vlan_add(priv, untag, pvid, vlan->vid, orig_dev); 265 } 266 267 static int cpsw_port_mdb_add(struct cpsw_priv *priv, 268 struct switchdev_obj_port_mdb *mdb) 269 270 { 271 struct net_device *orig_dev = mdb->obj.orig_dev; 272 bool cpu_port = netif_is_bridge_master(orig_dev); 273 struct cpsw_common *cpsw = priv->cpsw; 274 int port_mask; 275 int err; 276 277 if (cpu_port) 278 port_mask = BIT(HOST_PORT_NUM); 279 else 280 port_mask = BIT(priv->emac_port); 281 282 err = cpsw_ale_add_mcast(cpsw->ale, mdb->addr, port_mask, 283 ALE_VLAN, mdb->vid, 0); 284 dev_dbg(priv->dev, "MDB add: %s: vid %u:%pM ports: %X\n", 285 priv->ndev->name, mdb->vid, mdb->addr, port_mask); 286 287 return err; 288 } 289 290 static int cpsw_port_mdb_del(struct cpsw_priv *priv, 291 struct switchdev_obj_port_mdb *mdb) 292 293 { 294 struct net_device *orig_dev = mdb->obj.orig_dev; 295 bool cpu_port = netif_is_bridge_master(orig_dev); 296 struct cpsw_common *cpsw = priv->cpsw; 297 int del_mask; 298 int err; 299 300 if (cpu_port) 301 del_mask = BIT(HOST_PORT_NUM); 302 else 303 del_mask = BIT(priv->emac_port); 304 305 err = cpsw_ale_del_mcast(cpsw->ale, mdb->addr, del_mask, 306 ALE_VLAN, mdb->vid); 307 dev_dbg(priv->dev, "MDB del: %s: vid %u:%pM ports: %X\n", 308 priv->ndev->name, mdb->vid, mdb->addr, del_mask); 309 310 return err; 311 } 312 313 static int cpsw_port_obj_add(struct net_device *ndev, const void *ctx, 314 const struct switchdev_obj *obj, 315 struct netlink_ext_ack *extack) 316 { 317 struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj); 318 struct switchdev_obj_port_mdb *mdb = SWITCHDEV_OBJ_PORT_MDB(obj); 319 struct cpsw_priv *priv = netdev_priv(ndev); 320 int err = 0; 321 322 dev_dbg(priv->dev, "obj_add: id %u port: %u\n", 323 obj->id, priv->emac_port); 324 325 switch (obj->id) { 326 case SWITCHDEV_OBJ_ID_PORT_VLAN: 327 err = cpsw_port_vlans_add(priv, vlan); 328 break; 329 case SWITCHDEV_OBJ_ID_PORT_MDB: 330 case SWITCHDEV_OBJ_ID_HOST_MDB: 331 err = cpsw_port_mdb_add(priv, mdb); 332 break; 333 default: 334 err = -EOPNOTSUPP; 335 break; 336 } 337 338 return err; 339 } 340 341 static int cpsw_port_obj_del(struct net_device *ndev, const void *ctx, 342 const struct switchdev_obj *obj) 343 { 344 struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj); 345 struct switchdev_obj_port_mdb *mdb = SWITCHDEV_OBJ_PORT_MDB(obj); 346 struct cpsw_priv *priv = netdev_priv(ndev); 347 int err = 0; 348 349 dev_dbg(priv->dev, "obj_del: id %u port: %u\n", 350 obj->id, priv->emac_port); 351 352 switch (obj->id) { 353 case SWITCHDEV_OBJ_ID_PORT_VLAN: 354 err = cpsw_port_vlan_del(priv, vlan->vid, vlan->obj.orig_dev); 355 break; 356 case SWITCHDEV_OBJ_ID_PORT_MDB: 357 case SWITCHDEV_OBJ_ID_HOST_MDB: 358 err = cpsw_port_mdb_del(priv, mdb); 359 break; 360 default: 361 err = -EOPNOTSUPP; 362 break; 363 } 364 365 return err; 366 } 367 368 static void cpsw_fdb_offload_notify(struct net_device *ndev, 369 struct switchdev_notifier_fdb_info *rcv) 370 { 371 struct switchdev_notifier_fdb_info info; 372 373 info.addr = rcv->addr; 374 info.vid = rcv->vid; 375 info.offloaded = true; 376 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, 377 ndev, &info.info, NULL); 378 } 379 380 static void cpsw_switchdev_event_work(struct work_struct *work) 381 { 382 struct cpsw_switchdev_event_work *switchdev_work = 383 container_of(work, struct cpsw_switchdev_event_work, work); 384 struct cpsw_priv *priv = switchdev_work->priv; 385 struct switchdev_notifier_fdb_info *fdb; 386 struct cpsw_common *cpsw = priv->cpsw; 387 int port = priv->emac_port; 388 389 rtnl_lock(); 390 switch (switchdev_work->event) { 391 case SWITCHDEV_FDB_ADD_TO_DEVICE: 392 fdb = &switchdev_work->fdb_info; 393 394 dev_dbg(cpsw->dev, "cpsw_fdb_add: MACID = %pM vid = %u flags = %u %u -- port %d\n", 395 fdb->addr, fdb->vid, fdb->added_by_user, 396 fdb->offloaded, port); 397 398 if (!fdb->added_by_user || fdb->is_local) 399 break; 400 if (memcmp(priv->mac_addr, (u8 *)fdb->addr, ETH_ALEN) == 0) 401 port = HOST_PORT_NUM; 402 403 cpsw_ale_add_ucast(cpsw->ale, (u8 *)fdb->addr, port, 404 fdb->vid ? ALE_VLAN : 0, fdb->vid); 405 cpsw_fdb_offload_notify(priv->ndev, fdb); 406 break; 407 case SWITCHDEV_FDB_DEL_TO_DEVICE: 408 fdb = &switchdev_work->fdb_info; 409 410 dev_dbg(cpsw->dev, "cpsw_fdb_del: MACID = %pM vid = %u flags = %u %u -- port %d\n", 411 fdb->addr, fdb->vid, fdb->added_by_user, 412 fdb->offloaded, port); 413 414 if (!fdb->added_by_user || fdb->is_local) 415 break; 416 if (memcmp(priv->mac_addr, (u8 *)fdb->addr, ETH_ALEN) == 0) 417 port = HOST_PORT_NUM; 418 419 cpsw_ale_del_ucast(cpsw->ale, (u8 *)fdb->addr, port, 420 fdb->vid ? ALE_VLAN : 0, fdb->vid); 421 break; 422 default: 423 break; 424 } 425 rtnl_unlock(); 426 427 kfree(switchdev_work->fdb_info.addr); 428 kfree(switchdev_work); 429 dev_put(priv->ndev); 430 } 431 432 /* called under rcu_read_lock() */ 433 static int cpsw_switchdev_event(struct notifier_block *unused, 434 unsigned long event, void *ptr) 435 { 436 struct net_device *ndev = switchdev_notifier_info_to_dev(ptr); 437 struct switchdev_notifier_fdb_info *fdb_info = ptr; 438 struct cpsw_switchdev_event_work *switchdev_work; 439 struct cpsw_priv *priv = netdev_priv(ndev); 440 int err; 441 442 if (event == SWITCHDEV_PORT_ATTR_SET) { 443 err = switchdev_handle_port_attr_set(ndev, ptr, 444 cpsw_port_dev_check, 445 cpsw_port_attr_set); 446 return notifier_from_errno(err); 447 } 448 449 if (!cpsw_port_dev_check(ndev)) 450 return NOTIFY_DONE; 451 452 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC); 453 if (WARN_ON(!switchdev_work)) 454 return NOTIFY_BAD; 455 456 INIT_WORK(&switchdev_work->work, cpsw_switchdev_event_work); 457 switchdev_work->priv = priv; 458 switchdev_work->event = event; 459 460 switch (event) { 461 case SWITCHDEV_FDB_ADD_TO_DEVICE: 462 case SWITCHDEV_FDB_DEL_TO_DEVICE: 463 memcpy(&switchdev_work->fdb_info, ptr, 464 sizeof(switchdev_work->fdb_info)); 465 switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC); 466 if (!switchdev_work->fdb_info.addr) 467 goto err_addr_alloc; 468 ether_addr_copy((u8 *)switchdev_work->fdb_info.addr, 469 fdb_info->addr); 470 dev_hold(ndev); 471 break; 472 default: 473 kfree(switchdev_work); 474 return NOTIFY_DONE; 475 } 476 477 queue_work(system_long_wq, &switchdev_work->work); 478 479 return NOTIFY_DONE; 480 481 err_addr_alloc: 482 kfree(switchdev_work); 483 return NOTIFY_BAD; 484 } 485 486 static struct notifier_block cpsw_switchdev_notifier = { 487 .notifier_call = cpsw_switchdev_event, 488 }; 489 490 static int cpsw_switchdev_blocking_event(struct notifier_block *unused, 491 unsigned long event, void *ptr) 492 { 493 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 494 int err; 495 496 switch (event) { 497 case SWITCHDEV_PORT_OBJ_ADD: 498 err = switchdev_handle_port_obj_add(dev, ptr, 499 cpsw_port_dev_check, 500 cpsw_port_obj_add); 501 return notifier_from_errno(err); 502 case SWITCHDEV_PORT_OBJ_DEL: 503 err = switchdev_handle_port_obj_del(dev, ptr, 504 cpsw_port_dev_check, 505 cpsw_port_obj_del); 506 return notifier_from_errno(err); 507 case SWITCHDEV_PORT_ATTR_SET: 508 err = switchdev_handle_port_attr_set(dev, ptr, 509 cpsw_port_dev_check, 510 cpsw_port_attr_set); 511 return notifier_from_errno(err); 512 default: 513 break; 514 } 515 516 return NOTIFY_DONE; 517 } 518 519 static struct notifier_block cpsw_switchdev_bl_notifier = { 520 .notifier_call = cpsw_switchdev_blocking_event, 521 }; 522 523 int cpsw_switchdev_register_notifiers(struct cpsw_common *cpsw) 524 { 525 int ret = 0; 526 527 ret = register_switchdev_notifier(&cpsw_switchdev_notifier); 528 if (ret) { 529 dev_err(cpsw->dev, "register switchdev notifier fail ret:%d\n", 530 ret); 531 return ret; 532 } 533 534 ret = register_switchdev_blocking_notifier(&cpsw_switchdev_bl_notifier); 535 if (ret) { 536 dev_err(cpsw->dev, "register switchdev blocking notifier ret:%d\n", 537 ret); 538 unregister_switchdev_notifier(&cpsw_switchdev_notifier); 539 } 540 541 return ret; 542 } 543 544 void cpsw_switchdev_unregister_notifiers(struct cpsw_common *cpsw) 545 { 546 unregister_switchdev_blocking_notifier(&cpsw_switchdev_bl_notifier); 547 unregister_switchdev_notifier(&cpsw_switchdev_notifier); 548 } 549